8548 lines
305 KiB
C
8548 lines
305 KiB
C
/****************************************************************************
|
||
* *
|
||
* GNAT COMPILER COMPONENTS *
|
||
* *
|
||
* D E C L *
|
||
* *
|
||
* C Implementation File *
|
||
* *
|
||
* Copyright (C) 1992-2010, Free Software Foundation, Inc. *
|
||
* *
|
||
* GNAT is free software; you can redistribute it and/or modify it under *
|
||
* terms of the GNU General Public License as published by the Free Soft- *
|
||
* ware Foundation; either version 3, or (at your option) any later ver- *
|
||
* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
|
||
* OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
|
||
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
|
||
* for more details. You should have received a copy of the GNU General *
|
||
* Public License along with GCC; see the file COPYING3. If not see *
|
||
* <http://www.gnu.org/licenses/>. *
|
||
* *
|
||
* GNAT was originally developed by the GNAT team at New York University. *
|
||
* Extensive contributions were provided by Ada Core Technologies Inc. *
|
||
* *
|
||
****************************************************************************/
|
||
|
||
#include "config.h"
|
||
#include "system.h"
|
||
#include "coretypes.h"
|
||
#include "tm.h"
|
||
#include "tree.h"
|
||
#include "flags.h"
|
||
#include "toplev.h"
|
||
#include "ggc.h"
|
||
#include "target.h"
|
||
#include "expr.h"
|
||
#include "tree-inline.h"
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||
|
||
#include "ada.h"
|
||
#include "types.h"
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||
#include "atree.h"
|
||
#include "elists.h"
|
||
#include "namet.h"
|
||
#include "nlists.h"
|
||
#include "repinfo.h"
|
||
#include "snames.h"
|
||
#include "stringt.h"
|
||
#include "uintp.h"
|
||
#include "fe.h"
|
||
#include "sinfo.h"
|
||
#include "einfo.h"
|
||
#include "ada-tree.h"
|
||
#include "gigi.h"
|
||
|
||
#ifndef MAX_FIXED_MODE_SIZE
|
||
#define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
|
||
#endif
|
||
|
||
/* Convention_Stdcall should be processed in a specific way on Windows targets
|
||
only. The macro below is a helper to avoid having to check for a Windows
|
||
specific attribute throughout this unit. */
|
||
|
||
#if TARGET_DLLIMPORT_DECL_ATTRIBUTES
|
||
#define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall)
|
||
#else
|
||
#define Has_Stdcall_Convention(E) (0)
|
||
#endif
|
||
|
||
/* Stack realignment for functions with foreign conventions is provided on a
|
||
per back-end basis now, as it is handled by the prologue expanders and not
|
||
as part of the function's body any more. It might be requested by way of a
|
||
dedicated function type attribute on the targets that support it.
|
||
|
||
We need a way to avoid setting the attribute on the targets that don't
|
||
support it and use FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN for this purpose.
|
||
|
||
It is defined on targets where the circuitry is available, and indicates
|
||
whether the realignment is needed for 'main'. We use this to decide for
|
||
foreign subprograms as well.
|
||
|
||
It is not defined on targets where the circuitry is not implemented, and
|
||
we just never set the attribute in these cases.
|
||
|
||
Whether it is defined on all targets that would need it in theory is
|
||
not entirely clear. We currently trust the base GCC settings for this
|
||
purpose. */
|
||
|
||
#ifndef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
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||
#define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 0
|
||
#endif
|
||
|
||
struct incomplete
|
||
{
|
||
struct incomplete *next;
|
||
tree old_type;
|
||
Entity_Id full_type;
|
||
};
|
||
|
||
/* These variables are used to defer recursively expanding incomplete types
|
||
while we are processing an array, a record or a subprogram type. */
|
||
static int defer_incomplete_level = 0;
|
||
static struct incomplete *defer_incomplete_list;
|
||
|
||
/* This variable is used to delay expanding From_With_Type types until the
|
||
end of the spec. */
|
||
static struct incomplete *defer_limited_with;
|
||
|
||
/* These variables are used to defer finalizing types. The element of the
|
||
list is the TYPE_DECL associated with the type. */
|
||
static int defer_finalize_level = 0;
|
||
static VEC (tree,heap) *defer_finalize_list;
|
||
|
||
/* A hash table used to cache the result of annotate_value. */
|
||
static GTY ((if_marked ("tree_int_map_marked_p"),
|
||
param_is (struct tree_int_map))) htab_t annotate_value_cache;
|
||
|
||
enum alias_set_op
|
||
{
|
||
ALIAS_SET_COPY,
|
||
ALIAS_SET_SUBSET,
|
||
ALIAS_SET_SUPERSET
|
||
};
|
||
|
||
static void relate_alias_sets (tree, tree, enum alias_set_op);
|
||
|
||
static bool allocatable_size_p (tree, bool);
|
||
static void prepend_one_attribute_to (struct attrib **,
|
||
enum attr_type, tree, tree, Node_Id);
|
||
static void prepend_attributes (Entity_Id, struct attrib **);
|
||
static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool);
|
||
static bool is_variable_size (tree);
|
||
static tree elaborate_expression_1 (tree, Entity_Id, tree, bool, bool);
|
||
static tree elaborate_expression_2 (tree, Entity_Id, tree, bool, bool,
|
||
unsigned int);
|
||
static tree make_packable_type (tree, bool);
|
||
static tree gnat_to_gnu_component_type (Entity_Id, bool, bool);
|
||
static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool,
|
||
bool *);
|
||
static tree gnat_to_gnu_field (Entity_Id, tree, int, bool, bool);
|
||
static bool same_discriminant_p (Entity_Id, Entity_Id);
|
||
static bool array_type_has_nonaliased_component (tree, Entity_Id);
|
||
static bool compile_time_known_address_p (Node_Id);
|
||
static bool cannot_be_superflat_p (Node_Id);
|
||
static bool constructor_address_p (tree);
|
||
static void components_to_record (tree, Node_Id, tree, int, bool, tree *,
|
||
bool, bool, bool, bool, bool);
|
||
static Uint annotate_value (tree);
|
||
static void annotate_rep (Entity_Id, tree);
|
||
static tree build_position_list (tree, bool, tree, tree, unsigned int, tree);
|
||
static tree build_subst_list (Entity_Id, Entity_Id, bool);
|
||
static tree build_variant_list (tree, tree, tree);
|
||
static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool);
|
||
static void set_rm_size (Uint, tree, Entity_Id);
|
||
static tree make_type_from_size (tree, tree, bool);
|
||
static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
|
||
static unsigned int ceil_alignment (unsigned HOST_WIDE_INT);
|
||
static void check_ok_for_atomic (tree, Entity_Id, bool);
|
||
static int compatible_signatures_p (tree, tree);
|
||
static tree create_field_decl_from (tree, tree, tree, tree, tree, tree);
|
||
static tree get_rep_part (tree);
|
||
static tree get_variant_part (tree);
|
||
static tree create_variant_part_from (tree, tree, tree, tree, tree);
|
||
static void copy_and_substitute_in_size (tree, tree, tree);
|
||
static void rest_of_type_decl_compilation_no_defer (tree);
|
||
|
||
/* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
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||
entity, return the equivalent GCC tree for that entity (a ..._DECL node)
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||
and associate the ..._DECL node with the input GNAT defining identifier.
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||
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||
If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
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||
initial value (in GCC tree form). This is optional for a variable. For
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||
a renamed entity, GNU_EXPR gives the object being renamed.
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||
|
||
DEFINITION is nonzero if this call is intended for a definition. This is
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||
used for separate compilation where it is necessary to know whether an
|
||
external declaration or a definition must be created if the GCC equivalent
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||
was not created previously. The value of 1 is normally used for a nonzero
|
||
DEFINITION, but a value of 2 is used in special circumstances, defined in
|
||
the code. */
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||
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||
tree
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||
gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
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{
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||
/* Contains the kind of the input GNAT node. */
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||
const Entity_Kind kind = Ekind (gnat_entity);
|
||
/* True if this is a type. */
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||
const bool is_type = IN (kind, Type_Kind);
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||
/* True if debug info is requested for this entity. */
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||
const bool debug_info_p = Needs_Debug_Info (gnat_entity);
|
||
/* True if this entity is to be considered as imported. */
|
||
const bool imported_p
|
||
= (Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity)));
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||
/* For a type, contains the equivalent GNAT node to be used in gigi. */
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||
Entity_Id gnat_equiv_type = Empty;
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||
/* Temporary used to walk the GNAT tree. */
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||
Entity_Id gnat_temp;
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/* Contains the GCC DECL node which is equivalent to the input GNAT node.
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||
This node will be associated with the GNAT node by calling at the end
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||
of the `switch' statement. */
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tree gnu_decl = NULL_TREE;
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/* Contains the GCC type to be used for the GCC node. */
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||
tree gnu_type = NULL_TREE;
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||
/* Contains the GCC size tree to be used for the GCC node. */
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||
tree gnu_size = NULL_TREE;
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||
/* Contains the GCC name to be used for the GCC node. */
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||
tree gnu_entity_name;
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||
/* True if we have already saved gnu_decl as a GNAT association. */
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||
bool saved = false;
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||
/* True if we incremented defer_incomplete_level. */
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||
bool this_deferred = false;
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||
/* True if we incremented force_global. */
|
||
bool this_global = false;
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||
/* True if we should check to see if elaborated during processing. */
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||
bool maybe_present = false;
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||
/* True if we made GNU_DECL and its type here. */
|
||
bool this_made_decl = false;
|
||
/* Size and alignment of the GCC node, if meaningful. */
|
||
unsigned int esize = 0, align = 0;
|
||
/* Contains the list of attributes directly attached to the entity. */
|
||
struct attrib *attr_list = NULL;
|
||
|
||
/* Since a use of an Itype is a definition, process it as such if it
|
||
is not in a with'ed unit. */
|
||
if (!definition
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||
&& is_type
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||
&& Is_Itype (gnat_entity)
|
||
&& !present_gnu_tree (gnat_entity)
|
||
&& In_Extended_Main_Code_Unit (gnat_entity))
|
||
{
|
||
/* Ensure that we are in a subprogram mentioned in the Scope chain of
|
||
this entity, our current scope is global, or we encountered a task
|
||
or entry (where we can't currently accurately check scoping). */
|
||
if (!current_function_decl
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||
|| DECL_ELABORATION_PROC_P (current_function_decl))
|
||
{
|
||
process_type (gnat_entity);
|
||
return get_gnu_tree (gnat_entity);
|
||
}
|
||
|
||
for (gnat_temp = Scope (gnat_entity);
|
||
Present (gnat_temp);
|
||
gnat_temp = Scope (gnat_temp))
|
||
{
|
||
if (Is_Type (gnat_temp))
|
||
gnat_temp = Underlying_Type (gnat_temp);
|
||
|
||
if (Ekind (gnat_temp) == E_Subprogram_Body)
|
||
gnat_temp
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||
= Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
|
||
|
||
if (IN (Ekind (gnat_temp), Subprogram_Kind)
|
||
&& Present (Protected_Body_Subprogram (gnat_temp)))
|
||
gnat_temp = Protected_Body_Subprogram (gnat_temp);
|
||
|
||
if (Ekind (gnat_temp) == E_Entry
|
||
|| Ekind (gnat_temp) == E_Entry_Family
|
||
|| Ekind (gnat_temp) == E_Task_Type
|
||
|| (IN (Ekind (gnat_temp), Subprogram_Kind)
|
||
&& present_gnu_tree (gnat_temp)
|
||
&& (current_function_decl
|
||
== gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
|
||
{
|
||
process_type (gnat_entity);
|
||
return get_gnu_tree (gnat_entity);
|
||
}
|
||
}
|
||
|
||
/* This abort means the Itype has an incorrect scope, i.e. that its
|
||
scope does not correspond to the subprogram it is declared in. */
|
||
gcc_unreachable ();
|
||
}
|
||
|
||
/* If we've already processed this entity, return what we got last time.
|
||
If we are defining the node, we should not have already processed it.
|
||
In that case, we will abort below when we try to save a new GCC tree
|
||
for this object. We also need to handle the case of getting a dummy
|
||
type when a Full_View exists. */
|
||
if ((!definition || (is_type && imported_p))
|
||
&& present_gnu_tree (gnat_entity))
|
||
{
|
||
gnu_decl = get_gnu_tree (gnat_entity);
|
||
|
||
if (TREE_CODE (gnu_decl) == TYPE_DECL
|
||
&& TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
|
||
&& IN (kind, Incomplete_Or_Private_Kind)
|
||
&& Present (Full_View (gnat_entity)))
|
||
{
|
||
gnu_decl
|
||
= gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0);
|
||
save_gnu_tree (gnat_entity, NULL_TREE, false);
|
||
save_gnu_tree (gnat_entity, gnu_decl, false);
|
||
}
|
||
|
||
return gnu_decl;
|
||
}
|
||
|
||
/* If this is a numeric or enumeral type, or an access type, a nonzero
|
||
Esize must be specified unless it was specified by the programmer. */
|
||
gcc_assert (!Unknown_Esize (gnat_entity)
|
||
|| Has_Size_Clause (gnat_entity)
|
||
|| (!IN (kind, Numeric_Kind)
|
||
&& !IN (kind, Enumeration_Kind)
|
||
&& (!IN (kind, Access_Kind)
|
||
|| kind == E_Access_Protected_Subprogram_Type
|
||
|| kind == E_Anonymous_Access_Protected_Subprogram_Type
|
||
|| kind == E_Access_Subtype)));
|
||
|
||
/* The RM size must be specified for all discrete and fixed-point types. */
|
||
gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind)
|
||
&& Unknown_RM_Size (gnat_entity)));
|
||
|
||
/* If we get here, it means we have not yet done anything with this entity.
|
||
If we are not defining it, it must be a type or an entity that is defined
|
||
elsewhere or externally, otherwise we should have defined it already. */
|
||
gcc_assert (definition
|
||
|| type_annotate_only
|
||
|| is_type
|
||
|| kind == E_Discriminant
|
||
|| kind == E_Component
|
||
|| kind == E_Label
|
||
|| (kind == E_Constant && Present (Full_View (gnat_entity)))
|
||
|| Is_Public (gnat_entity));
|
||
|
||
/* Get the name of the entity and set up the line number and filename of
|
||
the original definition for use in any decl we make. */
|
||
gnu_entity_name = get_entity_name (gnat_entity);
|
||
Sloc_to_locus (Sloc (gnat_entity), &input_location);
|
||
|
||
/* For cases when we are not defining (i.e., we are referencing from
|
||
another compilation unit) public entities, show we are at global level
|
||
for the purpose of computing scopes. Don't do this for components or
|
||
discriminants since the relevant test is whether or not the record is
|
||
being defined. */
|
||
if (!definition
|
||
&& kind != E_Component
|
||
&& kind != E_Discriminant
|
||
&& Is_Public (gnat_entity)
|
||
&& !Is_Statically_Allocated (gnat_entity))
|
||
force_global++, this_global = true;
|
||
|
||
/* Handle any attributes directly attached to the entity. */
|
||
if (Has_Gigi_Rep_Item (gnat_entity))
|
||
prepend_attributes (gnat_entity, &attr_list);
|
||
|
||
/* Do some common processing for types. */
|
||
if (is_type)
|
||
{
|
||
/* Compute the equivalent type to be used in gigi. */
|
||
gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity);
|
||
|
||
/* Machine_Attributes on types are expected to be propagated to
|
||
subtypes. The corresponding Gigi_Rep_Items are only attached
|
||
to the first subtype though, so we handle the propagation here. */
|
||
if (Base_Type (gnat_entity) != gnat_entity
|
||
&& !Is_First_Subtype (gnat_entity)
|
||
&& Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity))))
|
||
prepend_attributes (First_Subtype (Base_Type (gnat_entity)),
|
||
&attr_list);
|
||
|
||
/* Compute a default value for the size of the type. */
|
||
if (Known_Esize (gnat_entity)
|
||
&& UI_Is_In_Int_Range (Esize (gnat_entity)))
|
||
{
|
||
unsigned int max_esize;
|
||
esize = UI_To_Int (Esize (gnat_entity));
|
||
|
||
if (IN (kind, Float_Kind))
|
||
max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE);
|
||
else if (IN (kind, Access_Kind))
|
||
max_esize = POINTER_SIZE * 2;
|
||
else
|
||
max_esize = LONG_LONG_TYPE_SIZE;
|
||
|
||
if (esize > max_esize)
|
||
esize = max_esize;
|
||
}
|
||
else
|
||
esize = LONG_LONG_TYPE_SIZE;
|
||
}
|
||
|
||
switch (kind)
|
||
{
|
||
case E_Constant:
|
||
/* If this is a use of a deferred constant without address clause,
|
||
get its full definition. */
|
||
if (!definition
|
||
&& No (Address_Clause (gnat_entity))
|
||
&& Present (Full_View (gnat_entity)))
|
||
{
|
||
gnu_decl
|
||
= gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0);
|
||
saved = true;
|
||
break;
|
||
}
|
||
|
||
/* If we have an external constant that we are not defining, get the
|
||
expression that is was defined to represent. We may throw that
|
||
expression away later if it is not a constant. Do not retrieve the
|
||
expression if it is an aggregate or allocator, because in complex
|
||
instantiation contexts it may not be expanded */
|
||
if (!definition
|
||
&& Present (Expression (Declaration_Node (gnat_entity)))
|
||
&& !No_Initialization (Declaration_Node (gnat_entity))
|
||
&& (Nkind (Expression (Declaration_Node (gnat_entity)))
|
||
!= N_Aggregate)
|
||
&& (Nkind (Expression (Declaration_Node (gnat_entity)))
|
||
!= N_Allocator))
|
||
gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
|
||
|
||
/* Ignore deferred constant definitions without address clause since
|
||
they are processed fully in the front-end. If No_Initialization
|
||
is set, this is not a deferred constant but a constant whose value
|
||
is built manually. And constants that are renamings are handled
|
||
like variables. */
|
||
if (definition
|
||
&& !gnu_expr
|
||
&& No (Address_Clause (gnat_entity))
|
||
&& !No_Initialization (Declaration_Node (gnat_entity))
|
||
&& No (Renamed_Object (gnat_entity)))
|
||
{
|
||
gnu_decl = error_mark_node;
|
||
saved = true;
|
||
break;
|
||
}
|
||
|
||
/* Ignore constant definitions already marked with the error node. See
|
||
the N_Object_Declaration case of gnat_to_gnu for the rationale. */
|
||
if (definition
|
||
&& gnu_expr
|
||
&& present_gnu_tree (gnat_entity)
|
||
&& get_gnu_tree (gnat_entity) == error_mark_node)
|
||
{
|
||
maybe_present = true;
|
||
break;
|
||
}
|
||
|
||
goto object;
|
||
|
||
case E_Exception:
|
||
/* We used to special case VMS exceptions here to directly map them to
|
||
their associated condition code. Since this code had to be masked
|
||
dynamically to strip off the severity bits, this caused trouble in
|
||
the GCC/ZCX case because the "type" pointers we store in the tables
|
||
have to be static. We now don't special case here anymore, and let
|
||
the regular processing take place, which leaves us with a regular
|
||
exception data object for VMS exceptions too. The condition code
|
||
mapping is taken care of by the front end and the bitmasking by the
|
||
runtime library. */
|
||
goto object;
|
||
|
||
case E_Discriminant:
|
||
case E_Component:
|
||
{
|
||
/* The GNAT record where the component was defined. */
|
||
Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
|
||
|
||
/* If the variable is an inherited record component (in the case of
|
||
extended record types), just return the inherited entity, which
|
||
must be a FIELD_DECL. Likewise for discriminants.
|
||
For discriminants of untagged records which have explicit
|
||
stored discriminants, return the entity for the corresponding
|
||
stored discriminant. Also use Original_Record_Component
|
||
if the record has a private extension. */
|
||
if (Present (Original_Record_Component (gnat_entity))
|
||
&& Original_Record_Component (gnat_entity) != gnat_entity)
|
||
{
|
||
gnu_decl
|
||
= gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
|
||
gnu_expr, definition);
|
||
saved = true;
|
||
break;
|
||
}
|
||
|
||
/* If the enclosing record has explicit stored discriminants,
|
||
then it is an untagged record. If the Corresponding_Discriminant
|
||
is not empty then this must be a renamed discriminant and its
|
||
Original_Record_Component must point to the corresponding explicit
|
||
stored discriminant (i.e. we should have taken the previous
|
||
branch). */
|
||
else if (Present (Corresponding_Discriminant (gnat_entity))
|
||
&& Is_Tagged_Type (gnat_record))
|
||
{
|
||
/* A tagged record has no explicit stored discriminants. */
|
||
gcc_assert (First_Discriminant (gnat_record)
|
||
== First_Stored_Discriminant (gnat_record));
|
||
gnu_decl
|
||
= gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
|
||
gnu_expr, definition);
|
||
saved = true;
|
||
break;
|
||
}
|
||
|
||
else if (Present (CR_Discriminant (gnat_entity))
|
||
&& type_annotate_only)
|
||
{
|
||
gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity),
|
||
gnu_expr, definition);
|
||
saved = true;
|
||
break;
|
||
}
|
||
|
||
/* If the enclosing record has explicit stored discriminants, then
|
||
it is an untagged record. If the Corresponding_Discriminant
|
||
is not empty then this must be a renamed discriminant and its
|
||
Original_Record_Component must point to the corresponding explicit
|
||
stored discriminant (i.e. we should have taken the first
|
||
branch). */
|
||
else if (Present (Corresponding_Discriminant (gnat_entity))
|
||
&& (First_Discriminant (gnat_record)
|
||
!= First_Stored_Discriminant (gnat_record)))
|
||
gcc_unreachable ();
|
||
|
||
/* Otherwise, if we are not defining this and we have no GCC type
|
||
for the containing record, make one for it. Then we should
|
||
have made our own equivalent. */
|
||
else if (!definition && !present_gnu_tree (gnat_record))
|
||
{
|
||
/* ??? If this is in a record whose scope is a protected
|
||
type and we have an Original_Record_Component, use it.
|
||
This is a workaround for major problems in protected type
|
||
handling. */
|
||
Entity_Id Scop = Scope (Scope (gnat_entity));
|
||
if ((Is_Protected_Type (Scop)
|
||
|| (Is_Private_Type (Scop)
|
||
&& Present (Full_View (Scop))
|
||
&& Is_Protected_Type (Full_View (Scop))))
|
||
&& Present (Original_Record_Component (gnat_entity)))
|
||
{
|
||
gnu_decl
|
||
= gnat_to_gnu_entity (Original_Record_Component
|
||
(gnat_entity),
|
||
gnu_expr, 0);
|
||
saved = true;
|
||
break;
|
||
}
|
||
|
||
gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
|
||
gnu_decl = get_gnu_tree (gnat_entity);
|
||
saved = true;
|
||
break;
|
||
}
|
||
|
||
else
|
||
/* Here we have no GCC type and this is a reference rather than a
|
||
definition. This should never happen. Most likely the cause is
|
||
reference before declaration in the gnat tree for gnat_entity. */
|
||
gcc_unreachable ();
|
||
}
|
||
|
||
case E_Loop_Parameter:
|
||
case E_Out_Parameter:
|
||
case E_Variable:
|
||
|
||
/* Simple variables, loop variables, Out parameters and exceptions. */
|
||
object:
|
||
{
|
||
bool const_flag
|
||
= ((kind == E_Constant || kind == E_Variable)
|
||
&& Is_True_Constant (gnat_entity)
|
||
&& !Treat_As_Volatile (gnat_entity)
|
||
&& (((Nkind (Declaration_Node (gnat_entity))
|
||
== N_Object_Declaration)
|
||
&& Present (Expression (Declaration_Node (gnat_entity))))
|
||
|| Present (Renamed_Object (gnat_entity))
|
||
|| imported_p));
|
||
bool inner_const_flag = const_flag;
|
||
bool static_p = Is_Statically_Allocated (gnat_entity);
|
||
bool mutable_p = false;
|
||
bool used_by_ref = false;
|
||
tree gnu_ext_name = NULL_TREE;
|
||
tree renamed_obj = NULL_TREE;
|
||
tree gnu_object_size;
|
||
|
||
if (Present (Renamed_Object (gnat_entity)) && !definition)
|
||
{
|
||
if (kind == E_Exception)
|
||
gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
|
||
NULL_TREE, 0);
|
||
else
|
||
gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
|
||
}
|
||
|
||
/* Get the type after elaborating the renamed object. */
|
||
gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
|
||
|
||
/* For a debug renaming declaration, build a pure debug entity. */
|
||
if (Present (Debug_Renaming_Link (gnat_entity)))
|
||
{
|
||
rtx addr;
|
||
gnu_decl = build_decl (input_location,
|
||
VAR_DECL, gnu_entity_name, gnu_type);
|
||
/* The (MEM (CONST (0))) pattern is prescribed by STABS. */
|
||
if (global_bindings_p ())
|
||
addr = gen_rtx_CONST (VOIDmode, const0_rtx);
|
||
else
|
||
addr = stack_pointer_rtx;
|
||
SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr));
|
||
gnat_pushdecl (gnu_decl, gnat_entity);
|
||
break;
|
||
}
|
||
|
||
/* If this is a loop variable, its type should be the base type.
|
||
This is because the code for processing a loop determines whether
|
||
a normal loop end test can be done by comparing the bounds of the
|
||
loop against those of the base type, which is presumed to be the
|
||
size used for computation. But this is not correct when the size
|
||
of the subtype is smaller than the type. */
|
||
if (kind == E_Loop_Parameter)
|
||
gnu_type = get_base_type (gnu_type);
|
||
|
||
/* Reject non-renamed objects whose type is an unconstrained array or
|
||
any object whose type is a dummy type or void. */
|
||
if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
|
||
&& No (Renamed_Object (gnat_entity)))
|
||
|| TYPE_IS_DUMMY_P (gnu_type)
|
||
|| TREE_CODE (gnu_type) == VOID_TYPE)
|
||
{
|
||
gcc_assert (type_annotate_only);
|
||
if (this_global)
|
||
force_global--;
|
||
return error_mark_node;
|
||
}
|
||
|
||
/* If an alignment is specified, use it if valid. Note that exceptions
|
||
are objects but don't have an alignment. We must do this before we
|
||
validate the size, since the alignment can affect the size. */
|
||
if (kind != E_Exception && Known_Alignment (gnat_entity))
|
||
{
|
||
gcc_assert (Present (Alignment (gnat_entity)));
|
||
align = validate_alignment (Alignment (gnat_entity), gnat_entity,
|
||
TYPE_ALIGN (gnu_type));
|
||
|
||
/* No point in changing the type if there is an address clause
|
||
as the final type of the object will be a reference type. */
|
||
if (Present (Address_Clause (gnat_entity)))
|
||
align = 0;
|
||
else
|
||
gnu_type
|
||
= maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity,
|
||
false, false, definition, true);
|
||
}
|
||
|
||
/* If we are defining the object, see if it has a Size and validate it
|
||
if so. If we are not defining the object and a Size clause applies,
|
||
simply retrieve the value. We don't want to ignore the clause and
|
||
it is expected to have been validated already. Then get the new
|
||
type, if any. */
|
||
if (definition)
|
||
gnu_size = validate_size (Esize (gnat_entity), gnu_type,
|
||
gnat_entity, VAR_DECL, false,
|
||
Has_Size_Clause (gnat_entity));
|
||
else if (Has_Size_Clause (gnat_entity))
|
||
gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
|
||
|
||
if (gnu_size)
|
||
{
|
||
gnu_type
|
||
= make_type_from_size (gnu_type, gnu_size,
|
||
Has_Biased_Representation (gnat_entity));
|
||
|
||
if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
|
||
gnu_size = NULL_TREE;
|
||
}
|
||
|
||
/* If this object has self-referential size, it must be a record with
|
||
a default discriminant. We are supposed to allocate an object of
|
||
the maximum size in this case, unless it is a constant with an
|
||
initializing expression, in which case we can get the size from
|
||
that. Note that the resulting size may still be a variable, so
|
||
this may end up with an indirect allocation. */
|
||
if (No (Renamed_Object (gnat_entity))
|
||
&& CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
|
||
{
|
||
if (gnu_expr && kind == E_Constant)
|
||
{
|
||
tree size = TYPE_SIZE (TREE_TYPE (gnu_expr));
|
||
if (CONTAINS_PLACEHOLDER_P (size))
|
||
{
|
||
/* If the initializing expression is itself a constant,
|
||
despite having a nominal type with self-referential
|
||
size, we can get the size directly from it. */
|
||
if (TREE_CODE (gnu_expr) == COMPONENT_REF
|
||
&& TYPE_IS_PADDING_P
|
||
(TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
|
||
&& TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL
|
||
&& (TREE_READONLY (TREE_OPERAND (gnu_expr, 0))
|
||
|| DECL_READONLY_ONCE_ELAB
|
||
(TREE_OPERAND (gnu_expr, 0))))
|
||
gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0));
|
||
else
|
||
gnu_size
|
||
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr);
|
||
}
|
||
else
|
||
gnu_size = size;
|
||
}
|
||
/* We may have no GNU_EXPR because No_Initialization is
|
||
set even though there's an Expression. */
|
||
else if (kind == E_Constant
|
||
&& (Nkind (Declaration_Node (gnat_entity))
|
||
== N_Object_Declaration)
|
||
&& Present (Expression (Declaration_Node (gnat_entity))))
|
||
gnu_size
|
||
= TYPE_SIZE (gnat_to_gnu_type
|
||
(Etype
|
||
(Expression (Declaration_Node (gnat_entity)))));
|
||
else
|
||
{
|
||
gnu_size = max_size (TYPE_SIZE (gnu_type), true);
|
||
mutable_p = true;
|
||
}
|
||
}
|
||
|
||
/* If the size is zero byte, make it one byte since some linkers have
|
||
troubles with zero-sized objects. If the object will have a
|
||
template, that will make it nonzero so don't bother. Also avoid
|
||
doing that for an object renaming or an object with an address
|
||
clause, as we would lose useful information on the view size
|
||
(e.g. for null array slices) and we are not allocating the object
|
||
here anyway. */
|
||
if (((gnu_size
|
||
&& integer_zerop (gnu_size)
|
||
&& !TREE_OVERFLOW (gnu_size))
|
||
|| (TYPE_SIZE (gnu_type)
|
||
&& integer_zerop (TYPE_SIZE (gnu_type))
|
||
&& !TREE_OVERFLOW (TYPE_SIZE (gnu_type))))
|
||
&& (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
|
||
|| !Is_Array_Type (Etype (gnat_entity)))
|
||
&& No (Renamed_Object (gnat_entity))
|
||
&& No (Address_Clause (gnat_entity)))
|
||
gnu_size = bitsize_unit_node;
|
||
|
||
/* If this is an object with no specified size and alignment, and
|
||
if either it is atomic or we are not optimizing alignment for
|
||
space and it is composite and not an exception, an Out parameter
|
||
or a reference to another object, and the size of its type is a
|
||
constant, set the alignment to the smallest one which is not
|
||
smaller than the size, with an appropriate cap. */
|
||
if (!gnu_size && align == 0
|
||
&& (Is_Atomic (gnat_entity)
|
||
|| (!Optimize_Alignment_Space (gnat_entity)
|
||
&& kind != E_Exception
|
||
&& kind != E_Out_Parameter
|
||
&& Is_Composite_Type (Etype (gnat_entity))
|
||
&& !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
|
||
&& !Is_Exported (gnat_entity)
|
||
&& !imported_p
|
||
&& No (Renamed_Object (gnat_entity))
|
||
&& No (Address_Clause (gnat_entity))))
|
||
&& TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
|
||
{
|
||
/* No point in jumping through all the hoops needed in order
|
||
to support BIGGEST_ALIGNMENT if we don't really have to.
|
||
So we cap to the smallest alignment that corresponds to
|
||
a known efficient memory access pattern of the target. */
|
||
unsigned int align_cap = Is_Atomic (gnat_entity)
|
||
? BIGGEST_ALIGNMENT
|
||
: get_mode_alignment (ptr_mode);
|
||
|
||
if (!host_integerp (TYPE_SIZE (gnu_type), 1)
|
||
|| compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0)
|
||
align = align_cap;
|
||
else
|
||
align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1));
|
||
|
||
/* But make sure not to under-align the object. */
|
||
if (align <= TYPE_ALIGN (gnu_type))
|
||
align = 0;
|
||
|
||
/* And honor the minimum valid atomic alignment, if any. */
|
||
#ifdef MINIMUM_ATOMIC_ALIGNMENT
|
||
else if (align < MINIMUM_ATOMIC_ALIGNMENT)
|
||
align = MINIMUM_ATOMIC_ALIGNMENT;
|
||
#endif
|
||
}
|
||
|
||
/* If the object is set to have atomic components, find the component
|
||
type and validate it.
|
||
|
||
??? Note that we ignore Has_Volatile_Components on objects; it's
|
||
not at all clear what to do in that case. */
|
||
if (Has_Atomic_Components (gnat_entity))
|
||
{
|
||
tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
|
||
? TREE_TYPE (gnu_type) : gnu_type);
|
||
|
||
while (TREE_CODE (gnu_inner) == ARRAY_TYPE
|
||
&& TYPE_MULTI_ARRAY_P (gnu_inner))
|
||
gnu_inner = TREE_TYPE (gnu_inner);
|
||
|
||
check_ok_for_atomic (gnu_inner, gnat_entity, true);
|
||
}
|
||
|
||
/* Now check if the type of the object allows atomic access. Note
|
||
that we must test the type, even if this object has size and
|
||
alignment to allow such access, because we will be going inside
|
||
the padded record to assign to the object. We could fix this by
|
||
always copying via an intermediate value, but it's not clear it's
|
||
worth the effort. */
|
||
if (Is_Atomic (gnat_entity))
|
||
check_ok_for_atomic (gnu_type, gnat_entity, false);
|
||
|
||
/* If this is an aliased object with an unconstrained nominal subtype,
|
||
make a type that includes the template. */
|
||
if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
|
||
&& Is_Array_Type (Etype (gnat_entity))
|
||
&& !type_annotate_only)
|
||
{
|
||
tree gnu_fat
|
||
= TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
|
||
|
||
gnu_type
|
||
= build_unc_object_type_from_ptr (gnu_fat, gnu_type,
|
||
concat_name (gnu_entity_name,
|
||
"UNC"),
|
||
debug_info_p);
|
||
}
|
||
|
||
#ifdef MINIMUM_ATOMIC_ALIGNMENT
|
||
/* If the size is a constant and no alignment is specified, force
|
||
the alignment to be the minimum valid atomic alignment. The
|
||
restriction on constant size avoids problems with variable-size
|
||
temporaries; if the size is variable, there's no issue with
|
||
atomic access. Also don't do this for a constant, since it isn't
|
||
necessary and can interfere with constant replacement. Finally,
|
||
do not do it for Out parameters since that creates an
|
||
size inconsistency with In parameters. */
|
||
if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
|
||
&& !FLOAT_TYPE_P (gnu_type)
|
||
&& !const_flag && No (Renamed_Object (gnat_entity))
|
||
&& !imported_p && No (Address_Clause (gnat_entity))
|
||
&& kind != E_Out_Parameter
|
||
&& (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
|
||
: TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
|
||
align = MINIMUM_ATOMIC_ALIGNMENT;
|
||
#endif
|
||
|
||
/* Make a new type with the desired size and alignment, if needed.
|
||
But do not take into account alignment promotions to compute the
|
||
size of the object. */
|
||
gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type);
|
||
if (gnu_size || align > 0)
|
||
gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
|
||
false, false, definition,
|
||
gnu_size ? true : false);
|
||
|
||
/* If this is a renaming, avoid as much as possible to create a new
|
||
object. However, in several cases, creating it is required.
|
||
This processing needs to be applied to the raw expression so
|
||
as to make it more likely to rename the underlying object. */
|
||
if (Present (Renamed_Object (gnat_entity)))
|
||
{
|
||
bool create_normal_object = false;
|
||
|
||
/* If the renamed object had padding, strip off the reference
|
||
to the inner object and reset our type. */
|
||
if ((TREE_CODE (gnu_expr) == COMPONENT_REF
|
||
&& TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
|
||
/* Strip useless conversions around the object. */
|
||
|| (TREE_CODE (gnu_expr) == NOP_EXPR
|
||
&& gnat_types_compatible_p
|
||
(TREE_TYPE (gnu_expr),
|
||
TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
|
||
{
|
||
gnu_expr = TREE_OPERAND (gnu_expr, 0);
|
||
gnu_type = TREE_TYPE (gnu_expr);
|
||
}
|
||
|
||
/* Case 1: If this is a constant renaming stemming from a function
|
||
call, treat it as a normal object whose initial value is what
|
||
is being renamed. RM 3.3 says that the result of evaluating a
|
||
function call is a constant object. As a consequence, it can
|
||
be the inner object of a constant renaming. In this case, the
|
||
renaming must be fully instantiated, i.e. it cannot be a mere
|
||
reference to (part of) an existing object. */
|
||
if (const_flag)
|
||
{
|
||
tree inner_object = gnu_expr;
|
||
while (handled_component_p (inner_object))
|
||
inner_object = TREE_OPERAND (inner_object, 0);
|
||
if (TREE_CODE (inner_object) == CALL_EXPR)
|
||
create_normal_object = true;
|
||
}
|
||
|
||
/* Otherwise, see if we can proceed with a stabilized version of
|
||
the renamed entity or if we need to make a new object. */
|
||
if (!create_normal_object)
|
||
{
|
||
tree maybe_stable_expr = NULL_TREE;
|
||
bool stable = false;
|
||
|
||
/* Case 2: If the renaming entity need not be materialized and
|
||
the renamed expression is something we can stabilize, use
|
||
that for the renaming. At the global level, we can only do
|
||
this if we know no SAVE_EXPRs need be made, because the
|
||
expression we return might be used in arbitrary conditional
|
||
branches so we must force the SAVE_EXPRs evaluation
|
||
immediately and this requires a function context. */
|
||
if (!Materialize_Entity (gnat_entity)
|
||
&& (!global_bindings_p ()
|
||
|| (staticp (gnu_expr)
|
||
&& !TREE_SIDE_EFFECTS (gnu_expr))))
|
||
{
|
||
maybe_stable_expr
|
||
= gnat_stabilize_reference (gnu_expr, true, &stable);
|
||
|
||
if (stable)
|
||
{
|
||
/* ??? No DECL_EXPR is created so we need to mark
|
||
the expression manually lest it is shared. */
|
||
if (global_bindings_p ())
|
||
MARK_VISITED (maybe_stable_expr);
|
||
gnu_decl = maybe_stable_expr;
|
||
save_gnu_tree (gnat_entity, gnu_decl, true);
|
||
saved = true;
|
||
annotate_object (gnat_entity, gnu_type, NULL_TREE,
|
||
false);
|
||
break;
|
||
}
|
||
|
||
/* The stabilization failed. Keep maybe_stable_expr
|
||
untouched here to let the pointer case below know
|
||
about that failure. */
|
||
}
|
||
|
||
/* Case 3: If this is a constant renaming and creating a
|
||
new object is allowed and cheap, treat it as a normal
|
||
object whose initial value is what is being renamed. */
|
||
if (const_flag
|
||
&& !Is_Composite_Type
|
||
(Underlying_Type (Etype (gnat_entity))))
|
||
;
|
||
|
||
/* Case 4: Make this into a constant pointer to the object we
|
||
are to rename and attach the object to the pointer if it is
|
||
something we can stabilize.
|
||
|
||
From the proper scope, attached objects will be referenced
|
||
directly instead of indirectly via the pointer to avoid
|
||
subtle aliasing problems with non-addressable entities.
|
||
They have to be stable because we must not evaluate the
|
||
variables in the expression every time the renaming is used.
|
||
The pointer is called a "renaming" pointer in this case.
|
||
|
||
In the rare cases where we cannot stabilize the renamed
|
||
object, we just make a "bare" pointer, and the renamed
|
||
entity is always accessed indirectly through it. */
|
||
else
|
||
{
|
||
gnu_type = build_reference_type (gnu_type);
|
||
inner_const_flag = TREE_READONLY (gnu_expr);
|
||
const_flag = true;
|
||
|
||
/* If the previous attempt at stabilizing failed, there
|
||
is no point in trying again and we reuse the result
|
||
without attaching it to the pointer. In this case it
|
||
will only be used as the initializing expression of
|
||
the pointer and thus needs no special treatment with
|
||
regard to multiple evaluations. */
|
||
if (maybe_stable_expr)
|
||
;
|
||
|
||
/* Otherwise, try to stabilize and attach the expression
|
||
to the pointer if the stabilization succeeds.
|
||
|
||
Note that this might introduce SAVE_EXPRs and we don't
|
||
check whether we're at the global level or not. This
|
||
is fine since we are building a pointer initializer and
|
||
neither the pointer nor the initializing expression can
|
||
be accessed before the pointer elaboration has taken
|
||
place in a correct program.
|
||
|
||
These SAVE_EXPRs will be evaluated at the right place
|
||
by either the evaluation of the initializer for the
|
||
non-global case or the elaboration code for the global
|
||
case, and will be attached to the elaboration procedure
|
||
in the latter case. */
|
||
else
|
||
{
|
||
maybe_stable_expr
|
||
= gnat_stabilize_reference (gnu_expr, true, &stable);
|
||
|
||
if (stable)
|
||
renamed_obj = maybe_stable_expr;
|
||
|
||
/* Attaching is actually performed downstream, as soon
|
||
as we have a VAR_DECL for the pointer we make. */
|
||
}
|
||
|
||
gnu_expr = build_unary_op (ADDR_EXPR, gnu_type,
|
||
maybe_stable_expr);
|
||
|
||
gnu_size = NULL_TREE;
|
||
used_by_ref = true;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Make a volatile version of this object's type if we are to make
|
||
the object volatile. We also interpret 13.3(19) conservatively
|
||
and disallow any optimizations for such a non-constant object. */
|
||
if ((Treat_As_Volatile (gnat_entity)
|
||
|| (!const_flag
|
||
&& (Is_Exported (gnat_entity)
|
||
|| imported_p
|
||
|| Present (Address_Clause (gnat_entity)))))
|
||
&& !TYPE_VOLATILE (gnu_type))
|
||
gnu_type = build_qualified_type (gnu_type,
|
||
(TYPE_QUALS (gnu_type)
|
||
| TYPE_QUAL_VOLATILE));
|
||
|
||
/* If we are defining an aliased object whose nominal subtype is
|
||
unconstrained, the object is a record that contains both the
|
||
template and the object. If there is an initializer, it will
|
||
have already been converted to the right type, but we need to
|
||
create the template if there is no initializer. */
|
||
if (definition
|
||
&& !gnu_expr
|
||
&& TREE_CODE (gnu_type) == RECORD_TYPE
|
||
&& (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
|
||
/* Beware that padding might have been introduced above. */
|
||
|| (TYPE_PADDING_P (gnu_type)
|
||
&& TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
|
||
== RECORD_TYPE
|
||
&& TYPE_CONTAINS_TEMPLATE_P
|
||
(TREE_TYPE (TYPE_FIELDS (gnu_type))))))
|
||
{
|
||
tree template_field
|
||
= TYPE_PADDING_P (gnu_type)
|
||
? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
|
||
: TYPE_FIELDS (gnu_type);
|
||
gnu_expr
|
||
= gnat_build_constructor
|
||
(gnu_type,
|
||
tree_cons
|
||
(template_field,
|
||
build_template (TREE_TYPE (template_field),
|
||
TREE_TYPE (TREE_CHAIN (template_field)),
|
||
NULL_TREE),
|
||
NULL_TREE));
|
||
}
|
||
|
||
/* Convert the expression to the type of the object except in the
|
||
case where the object's type is unconstrained or the object's type
|
||
is a padded record whose field is of self-referential size. In
|
||
the former case, converting will generate unnecessary evaluations
|
||
of the CONSTRUCTOR to compute the size and in the latter case, we
|
||
want to only copy the actual data. */
|
||
if (gnu_expr
|
||
&& TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
|
||
&& !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
|
||
&& !(TYPE_IS_PADDING_P (gnu_type)
|
||
&& CONTAINS_PLACEHOLDER_P
|
||
(TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
|
||
gnu_expr = convert (gnu_type, gnu_expr);
|
||
|
||
/* If this is a pointer that doesn't have an initializing expression,
|
||
initialize it to NULL, unless the object is imported. */
|
||
if (definition
|
||
&& (POINTER_TYPE_P (gnu_type) || TYPE_IS_FAT_POINTER_P (gnu_type))
|
||
&& !gnu_expr
|
||
&& !Is_Imported (gnat_entity))
|
||
gnu_expr = integer_zero_node;
|
||
|
||
/* If we are defining the object and it has an Address clause, we must
|
||
either get the address expression from the saved GCC tree for the
|
||
object if it has a Freeze node, or elaborate the address expression
|
||
here since the front-end has guaranteed that the elaboration has no
|
||
effects in this case. */
|
||
if (definition && Present (Address_Clause (gnat_entity)))
|
||
{
|
||
Node_Id gnat_expr = Expression (Address_Clause (gnat_entity));
|
||
tree gnu_address
|
||
= present_gnu_tree (gnat_entity)
|
||
? get_gnu_tree (gnat_entity) : gnat_to_gnu (gnat_expr);
|
||
|
||
save_gnu_tree (gnat_entity, NULL_TREE, false);
|
||
|
||
/* Ignore the size. It's either meaningless or was handled
|
||
above. */
|
||
gnu_size = NULL_TREE;
|
||
/* Convert the type of the object to a reference type that can
|
||
alias everything as per 13.3(19). */
|
||
gnu_type
|
||
= build_reference_type_for_mode (gnu_type, ptr_mode, true);
|
||
gnu_address = convert (gnu_type, gnu_address);
|
||
used_by_ref = true;
|
||
const_flag
|
||
= !Is_Public (gnat_entity)
|
||
|| compile_time_known_address_p (gnat_expr);
|
||
|
||
/* If this is a deferred constant, the initializer is attached to
|
||
the full view. */
|
||
if (kind == E_Constant && Present (Full_View (gnat_entity)))
|
||
gnu_expr
|
||
= gnat_to_gnu
|
||
(Expression (Declaration_Node (Full_View (gnat_entity))));
|
||
|
||
/* If we don't have an initializing expression for the underlying
|
||
variable, the initializing expression for the pointer is the
|
||
specified address. Otherwise, we have to make a COMPOUND_EXPR
|
||
to assign both the address and the initial value. */
|
||
if (!gnu_expr)
|
||
gnu_expr = gnu_address;
|
||
else
|
||
gnu_expr
|
||
= build2 (COMPOUND_EXPR, gnu_type,
|
||
build_binary_op
|
||
(MODIFY_EXPR, NULL_TREE,
|
||
build_unary_op (INDIRECT_REF, NULL_TREE,
|
||
gnu_address),
|
||
gnu_expr),
|
||
gnu_address);
|
||
}
|
||
|
||
/* If it has an address clause and we are not defining it, mark it
|
||
as an indirect object. Likewise for Stdcall objects that are
|
||
imported. */
|
||
if ((!definition && Present (Address_Clause (gnat_entity)))
|
||
|| (Is_Imported (gnat_entity)
|
||
&& Has_Stdcall_Convention (gnat_entity)))
|
||
{
|
||
/* Convert the type of the object to a reference type that can
|
||
alias everything as per 13.3(19). */
|
||
gnu_type
|
||
= build_reference_type_for_mode (gnu_type, ptr_mode, true);
|
||
gnu_size = NULL_TREE;
|
||
|
||
/* No point in taking the address of an initializing expression
|
||
that isn't going to be used. */
|
||
gnu_expr = NULL_TREE;
|
||
|
||
/* If it has an address clause whose value is known at compile
|
||
time, make the object a CONST_DECL. This will avoid a
|
||
useless dereference. */
|
||
if (Present (Address_Clause (gnat_entity)))
|
||
{
|
||
Node_Id gnat_address
|
||
= Expression (Address_Clause (gnat_entity));
|
||
|
||
if (compile_time_known_address_p (gnat_address))
|
||
{
|
||
gnu_expr = gnat_to_gnu (gnat_address);
|
||
const_flag = true;
|
||
}
|
||
}
|
||
|
||
used_by_ref = true;
|
||
}
|
||
|
||
/* If we are at top level and this object is of variable size,
|
||
make the actual type a hidden pointer to the real type and
|
||
make the initializer be a memory allocation and initialization.
|
||
Likewise for objects we aren't defining (presumed to be
|
||
external references from other packages), but there we do
|
||
not set up an initialization.
|
||
|
||
If the object's size overflows, make an allocator too, so that
|
||
Storage_Error gets raised. Note that we will never free
|
||
such memory, so we presume it never will get allocated. */
|
||
if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
|
||
global_bindings_p ()
|
||
|| !definition
|
||
|| static_p)
|
||
|| (gnu_size && !allocatable_size_p (gnu_size,
|
||
global_bindings_p ()
|
||
|| !definition
|
||
|| static_p)))
|
||
{
|
||
gnu_type = build_reference_type (gnu_type);
|
||
gnu_size = NULL_TREE;
|
||
used_by_ref = true;
|
||
const_flag = true;
|
||
|
||
/* In case this was a aliased object whose nominal subtype is
|
||
unconstrained, the pointer above will be a thin pointer and
|
||
build_allocator will automatically make the template.
|
||
|
||
If we have a template initializer only (that we made above),
|
||
pretend there is none and rely on what build_allocator creates
|
||
again anyway. Otherwise (if we have a full initializer), get
|
||
the data part and feed that to build_allocator.
|
||
|
||
If we are elaborating a mutable object, tell build_allocator to
|
||
ignore a possibly simpler size from the initializer, if any, as
|
||
we must allocate the maximum possible size in this case. */
|
||
if (definition)
|
||
{
|
||
tree gnu_alloc_type = TREE_TYPE (gnu_type);
|
||
|
||
if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
|
||
&& TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
|
||
{
|
||
gnu_alloc_type
|
||
= TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
|
||
|
||
if (TREE_CODE (gnu_expr) == CONSTRUCTOR
|
||
&& 1 == VEC_length (constructor_elt,
|
||
CONSTRUCTOR_ELTS (gnu_expr)))
|
||
gnu_expr = 0;
|
||
else
|
||
gnu_expr
|
||
= build_component_ref
|
||
(gnu_expr, NULL_TREE,
|
||
TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
|
||
false);
|
||
}
|
||
|
||
if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
|
||
&& TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
|
||
&& !Is_Imported (gnat_entity))
|
||
post_error ("?Storage_Error will be raised at run-time!",
|
||
gnat_entity);
|
||
|
||
gnu_expr
|
||
= build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
|
||
Empty, Empty, gnat_entity, mutable_p);
|
||
}
|
||
else
|
||
{
|
||
gnu_expr = NULL_TREE;
|
||
const_flag = false;
|
||
}
|
||
}
|
||
|
||
/* If this object would go into the stack and has an alignment larger
|
||
than the largest stack alignment the back-end can honor, resort to
|
||
a variable of "aligning type". */
|
||
if (!global_bindings_p () && !static_p && definition
|
||
&& !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
|
||
{
|
||
/* Create the new variable. No need for extra room before the
|
||
aligned field as this is in automatic storage. */
|
||
tree gnu_new_type
|
||
= make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
|
||
TYPE_SIZE_UNIT (gnu_type),
|
||
BIGGEST_ALIGNMENT, 0);
|
||
tree gnu_new_var
|
||
= create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
|
||
NULL_TREE, gnu_new_type, NULL_TREE, false,
|
||
false, false, false, NULL, gnat_entity);
|
||
|
||
/* Initialize the aligned field if we have an initializer. */
|
||
if (gnu_expr)
|
||
add_stmt_with_node
|
||
(build_binary_op (MODIFY_EXPR, NULL_TREE,
|
||
build_component_ref
|
||
(gnu_new_var, NULL_TREE,
|
||
TYPE_FIELDS (gnu_new_type), false),
|
||
gnu_expr),
|
||
gnat_entity);
|
||
|
||
/* And setup this entity as a reference to the aligned field. */
|
||
gnu_type = build_reference_type (gnu_type);
|
||
gnu_expr
|
||
= build_unary_op
|
||
(ADDR_EXPR, gnu_type,
|
||
build_component_ref (gnu_new_var, NULL_TREE,
|
||
TYPE_FIELDS (gnu_new_type), false));
|
||
|
||
gnu_size = NULL_TREE;
|
||
used_by_ref = true;
|
||
const_flag = true;
|
||
}
|
||
|
||
if (const_flag)
|
||
gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
|
||
| TYPE_QUAL_CONST));
|
||
|
||
/* Convert the expression to the type of the object except in the
|
||
case where the object's type is unconstrained or the object's type
|
||
is a padded record whose field is of self-referential size. In
|
||
the former case, converting will generate unnecessary evaluations
|
||
of the CONSTRUCTOR to compute the size and in the latter case, we
|
||
want to only copy the actual data. */
|
||
if (gnu_expr
|
||
&& TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
|
||
&& !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
|
||
&& !(TYPE_IS_PADDING_P (gnu_type)
|
||
&& CONTAINS_PLACEHOLDER_P
|
||
(TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
|
||
gnu_expr = convert (gnu_type, gnu_expr);
|
||
|
||
/* If this name is external or there was a name specified, use it,
|
||
unless this is a VMS exception object since this would conflict
|
||
with the symbol we need to export in addition. Don't use the
|
||
Interface_Name if there is an address clause (see CD30005). */
|
||
if (!Is_VMS_Exception (gnat_entity)
|
||
&& ((Present (Interface_Name (gnat_entity))
|
||
&& No (Address_Clause (gnat_entity)))
|
||
|| (Is_Public (gnat_entity)
|
||
&& (!Is_Imported (gnat_entity)
|
||
|| Is_Exported (gnat_entity)))))
|
||
gnu_ext_name = create_concat_name (gnat_entity, NULL);
|
||
|
||
/* If this is an aggregate constant initialized to a constant, force it
|
||
to be statically allocated. This saves an initialization copy. */
|
||
if (!static_p
|
||
&& const_flag
|
||
&& gnu_expr && TREE_CONSTANT (gnu_expr)
|
||
&& AGGREGATE_TYPE_P (gnu_type)
|
||
&& host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
|
||
&& !(TYPE_IS_PADDING_P (gnu_type)
|
||
&& !host_integerp (TYPE_SIZE_UNIT
|
||
(TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
|
||
static_p = true;
|
||
|
||
/* Now create the variable or the constant and set various flags. */
|
||
gnu_decl
|
||
= create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
|
||
gnu_expr, const_flag, Is_Public (gnat_entity),
|
||
imported_p || !definition, static_p, attr_list,
|
||
gnat_entity);
|
||
DECL_BY_REF_P (gnu_decl) = used_by_ref;
|
||
DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
|
||
|
||
/* If we are defining an Out parameter and optimization isn't enabled,
|
||
create a fake PARM_DECL for debugging purposes and make it point to
|
||
the VAR_DECL. Suppress debug info for the latter but make sure it
|
||
will live on the stack so that it can be accessed from within the
|
||
debugger through the PARM_DECL. */
|
||
if (kind == E_Out_Parameter && definition && !optimize && debug_info_p)
|
||
{
|
||
tree param = create_param_decl (gnu_entity_name, gnu_type, false);
|
||
gnat_pushdecl (param, gnat_entity);
|
||
SET_DECL_VALUE_EXPR (param, gnu_decl);
|
||
DECL_HAS_VALUE_EXPR_P (param) = 1;
|
||
DECL_IGNORED_P (gnu_decl) = 1;
|
||
TREE_ADDRESSABLE (gnu_decl) = 1;
|
||
}
|
||
|
||
/* If this is a renaming pointer, attach the renamed object to it and
|
||
register it if we are at top level. */
|
||
if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
|
||
{
|
||
SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
|
||
if (global_bindings_p ())
|
||
{
|
||
DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
|
||
record_global_renaming_pointer (gnu_decl);
|
||
}
|
||
}
|
||
|
||
/* If this is a constant and we are defining it or it generates a real
|
||
symbol at the object level and we are referencing it, we may want
|
||
or need to have a true variable to represent it:
|
||
- if optimization isn't enabled, for debugging purposes,
|
||
- if the constant is public and not overlaid on something else,
|
||
- if its address is taken,
|
||
- if either itself or its type is aliased. */
|
||
if (TREE_CODE (gnu_decl) == CONST_DECL
|
||
&& (definition || Sloc (gnat_entity) > Standard_Location)
|
||
&& ((!optimize && debug_info_p)
|
||
|| (Is_Public (gnat_entity)
|
||
&& No (Address_Clause (gnat_entity)))
|
||
|| Address_Taken (gnat_entity)
|
||
|| Is_Aliased (gnat_entity)
|
||
|| Is_Aliased (Etype (gnat_entity))))
|
||
{
|
||
tree gnu_corr_var
|
||
= create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
|
||
gnu_expr, true, Is_Public (gnat_entity),
|
||
!definition, static_p, attr_list,
|
||
gnat_entity);
|
||
|
||
SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
|
||
|
||
/* As debugging information will be generated for the variable,
|
||
do not generate debugging information for the constant. */
|
||
if (debug_info_p)
|
||
DECL_IGNORED_P (gnu_decl) = 1;
|
||
else
|
||
DECL_IGNORED_P (gnu_corr_var) = 1;
|
||
}
|
||
|
||
/* If this is a constant, even if we don't need a true variable, we
|
||
may need to avoid returning the initializer in every case. That
|
||
can happen for the address of a (constant) constructor because,
|
||
upon dereferencing it, the constructor will be reinjected in the
|
||
tree, which may not be valid in every case; see lvalue_required_p
|
||
for more details. */
|
||
if (TREE_CODE (gnu_decl) == CONST_DECL)
|
||
DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr);
|
||
|
||
/* If this object is declared in a block that contains a block with an
|
||
exception handler, and we aren't using the GCC exception mechanism,
|
||
we must force this variable in memory in order to avoid an invalid
|
||
optimization. */
|
||
if (Exception_Mechanism != Back_End_Exceptions
|
||
&& Has_Nested_Block_With_Handler (Scope (gnat_entity)))
|
||
TREE_ADDRESSABLE (gnu_decl) = 1;
|
||
|
||
/* If we are defining an object with variable size or an object with
|
||
fixed size that will be dynamically allocated, and we are using the
|
||
setjmp/longjmp exception mechanism, update the setjmp buffer. */
|
||
if (definition
|
||
&& Exception_Mechanism == Setjmp_Longjmp
|
||
&& get_block_jmpbuf_decl ()
|
||
&& DECL_SIZE_UNIT (gnu_decl)
|
||
&& (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
|
||
|| (flag_stack_check == GENERIC_STACK_CHECK
|
||
&& compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
|
||
STACK_CHECK_MAX_VAR_SIZE) > 0)))
|
||
add_stmt_with_node (build_call_1_expr
|
||
(update_setjmp_buf_decl,
|
||
build_unary_op (ADDR_EXPR, NULL_TREE,
|
||
get_block_jmpbuf_decl ())),
|
||
gnat_entity);
|
||
|
||
/* Back-annotate Esize and Alignment of the object if not already
|
||
known. Note that we pick the values of the type, not those of
|
||
the object, to shield ourselves from low-level platform-dependent
|
||
adjustments like alignment promotion. This is both consistent with
|
||
all the treatment above, where alignment and size are set on the
|
||
type of the object and not on the object directly, and makes it
|
||
possible to support all confirming representation clauses. */
|
||
annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size,
|
||
used_by_ref);
|
||
}
|
||
break;
|
||
|
||
case E_Void:
|
||
/* Return a TYPE_DECL for "void" that we previously made. */
|
||
gnu_decl = TYPE_NAME (void_type_node);
|
||
break;
|
||
|
||
case E_Enumeration_Type:
|
||
/* A special case: for the types Character and Wide_Character in
|
||
Standard, we do not list all the literals. So if the literals
|
||
are not specified, make this an unsigned type. */
|
||
if (No (First_Literal (gnat_entity)))
|
||
{
|
||
gnu_type = make_unsigned_type (esize);
|
||
TYPE_NAME (gnu_type) = gnu_entity_name;
|
||
|
||
/* Set TYPE_STRING_FLAG for Character and Wide_Character types.
|
||
This is needed by the DWARF-2 back-end to distinguish between
|
||
unsigned integer types and character types. */
|
||
TYPE_STRING_FLAG (gnu_type) = 1;
|
||
break;
|
||
}
|
||
|
||
{
|
||
/* We have a list of enumeral constants in First_Literal. We make a
|
||
CONST_DECL for each one and build into GNU_LITERAL_LIST the list to
|
||
be placed into TYPE_FIELDS. Each node in the list is a TREE_LIST
|
||
whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the
|
||
value of the literal. But when we have a regular boolean type, we
|
||
simplify this a little by using a BOOLEAN_TYPE. */
|
||
bool is_boolean = Is_Boolean_Type (gnat_entity)
|
||
&& !Has_Non_Standard_Rep (gnat_entity);
|
||
tree gnu_literal_list = NULL_TREE;
|
||
Entity_Id gnat_literal;
|
||
|
||
if (Is_Unsigned_Type (gnat_entity))
|
||
gnu_type = make_unsigned_type (esize);
|
||
else
|
||
gnu_type = make_signed_type (esize);
|
||
|
||
TREE_SET_CODE (gnu_type, is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE);
|
||
|
||
for (gnat_literal = First_Literal (gnat_entity);
|
||
Present (gnat_literal);
|
||
gnat_literal = Next_Literal (gnat_literal))
|
||
{
|
||
tree gnu_value
|
||
= UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type);
|
||
tree gnu_literal
|
||
= create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
|
||
gnu_type, gnu_value, true, false, false,
|
||
false, NULL, gnat_literal);
|
||
|
||
save_gnu_tree (gnat_literal, gnu_literal, false);
|
||
gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
|
||
gnu_value, gnu_literal_list);
|
||
}
|
||
|
||
if (!is_boolean)
|
||
TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
|
||
|
||
/* Note that the bounds are updated at the end of this function
|
||
to avoid an infinite recursion since they refer to the type. */
|
||
}
|
||
break;
|
||
|
||
case E_Signed_Integer_Type:
|
||
case E_Ordinary_Fixed_Point_Type:
|
||
case E_Decimal_Fixed_Point_Type:
|
||
/* For integer types, just make a signed type the appropriate number
|
||
of bits. */
|
||
gnu_type = make_signed_type (esize);
|
||
break;
|
||
|
||
case E_Modular_Integer_Type:
|
||
{
|
||
/* For modular types, make the unsigned type of the proper number
|
||
of bits and then set up the modulus, if required. */
|
||
tree gnu_modulus, gnu_high = NULL_TREE;
|
||
|
||
/* Packed array types are supposed to be subtypes only. */
|
||
gcc_assert (!Is_Packed_Array_Type (gnat_entity));
|
||
|
||
gnu_type = make_unsigned_type (esize);
|
||
|
||
/* Get the modulus in this type. If it overflows, assume it is because
|
||
it is equal to 2**Esize. Note that there is no overflow checking
|
||
done on unsigned type, so we detect the overflow by looking for
|
||
a modulus of zero, which is otherwise invalid. */
|
||
gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
|
||
|
||
if (!integer_zerop (gnu_modulus))
|
||
{
|
||
TYPE_MODULAR_P (gnu_type) = 1;
|
||
SET_TYPE_MODULUS (gnu_type, gnu_modulus);
|
||
gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
|
||
convert (gnu_type, integer_one_node));
|
||
}
|
||
|
||
/* If the upper bound is not maximal, make an extra subtype. */
|
||
if (gnu_high
|
||
&& !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type)))
|
||
{
|
||
tree gnu_subtype = make_unsigned_type (esize);
|
||
SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high);
|
||
TREE_TYPE (gnu_subtype) = gnu_type;
|
||
TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
|
||
TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
|
||
gnu_type = gnu_subtype;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case E_Signed_Integer_Subtype:
|
||
case E_Enumeration_Subtype:
|
||
case E_Modular_Integer_Subtype:
|
||
case E_Ordinary_Fixed_Point_Subtype:
|
||
case E_Decimal_Fixed_Point_Subtype:
|
||
|
||
/* For integral subtypes, we make a new INTEGER_TYPE. Note that we do
|
||
not want to call create_range_type since we would like each subtype
|
||
node to be distinct. ??? Historically this was in preparation for
|
||
when memory aliasing is implemented, but that's obsolete now given
|
||
the call to relate_alias_sets below.
|
||
|
||
The TREE_TYPE field of the INTEGER_TYPE points to the base type;
|
||
this fact is used by the arithmetic conversion functions.
|
||
|
||
We elaborate the Ancestor_Subtype if it is not in the current unit
|
||
and one of our bounds is non-static. We do this to ensure consistent
|
||
naming in the case where several subtypes share the same bounds, by
|
||
elaborating the first such subtype first, thus using its name. */
|
||
|
||
if (!definition
|
||
&& Present (Ancestor_Subtype (gnat_entity))
|
||
&& !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
|
||
&& (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
|
||
|| !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
|
||
gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
|
||
|
||
/* Set the precision to the Esize except for bit-packed arrays. */
|
||
if (Is_Packed_Array_Type (gnat_entity)
|
||
&& Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
|
||
esize = UI_To_Int (RM_Size (gnat_entity));
|
||
|
||
/* This should be an unsigned type if the base type is unsigned or
|
||
if the lower bound is constant and non-negative or if the type
|
||
is biased. */
|
||
if (Is_Unsigned_Type (Etype (gnat_entity))
|
||
|| Is_Unsigned_Type (gnat_entity)
|
||
|| Has_Biased_Representation (gnat_entity))
|
||
gnu_type = make_unsigned_type (esize);
|
||
else
|
||
gnu_type = make_signed_type (esize);
|
||
TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
|
||
|
||
SET_TYPE_RM_MIN_VALUE
|
||
(gnu_type,
|
||
convert (TREE_TYPE (gnu_type),
|
||
elaborate_expression (Type_Low_Bound (gnat_entity),
|
||
gnat_entity, get_identifier ("L"),
|
||
definition, true,
|
||
Needs_Debug_Info (gnat_entity))));
|
||
|
||
SET_TYPE_RM_MAX_VALUE
|
||
(gnu_type,
|
||
convert (TREE_TYPE (gnu_type),
|
||
elaborate_expression (Type_High_Bound (gnat_entity),
|
||
gnat_entity, get_identifier ("U"),
|
||
definition, true,
|
||
Needs_Debug_Info (gnat_entity))));
|
||
|
||
/* One of the above calls might have caused us to be elaborated,
|
||
so don't blow up if so. */
|
||
if (present_gnu_tree (gnat_entity))
|
||
{
|
||
maybe_present = true;
|
||
break;
|
||
}
|
||
|
||
TYPE_BIASED_REPRESENTATION_P (gnu_type)
|
||
= Has_Biased_Representation (gnat_entity);
|
||
|
||
/* Attach the TYPE_STUB_DECL in case we have a parallel type. */
|
||
TYPE_STUB_DECL (gnu_type)
|
||
= create_type_stub_decl (gnu_entity_name, gnu_type);
|
||
|
||
/* Inherit our alias set from what we're a subtype of. Subtypes
|
||
are not different types and a pointer can designate any instance
|
||
within a subtype hierarchy. */
|
||
relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
|
||
|
||
/* For a packed array, make the original array type a parallel type. */
|
||
if (debug_info_p
|
||
&& Is_Packed_Array_Type (gnat_entity)
|
||
&& present_gnu_tree (Original_Array_Type (gnat_entity)))
|
||
add_parallel_type (TYPE_STUB_DECL (gnu_type),
|
||
gnat_to_gnu_type
|
||
(Original_Array_Type (gnat_entity)));
|
||
|
||
/* We have to handle clauses that under-align the type specially. */
|
||
if ((Present (Alignment_Clause (gnat_entity))
|
||
|| (Is_Packed_Array_Type (gnat_entity)
|
||
&& Present
|
||
(Alignment_Clause (Original_Array_Type (gnat_entity)))))
|
||
&& UI_Is_In_Int_Range (Alignment (gnat_entity)))
|
||
{
|
||
align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT;
|
||
if (align >= TYPE_ALIGN (gnu_type))
|
||
align = 0;
|
||
}
|
||
|
||
/* If the type we are dealing with represents a bit-packed array,
|
||
we need to have the bits left justified on big-endian targets
|
||
and right justified on little-endian targets. We also need to
|
||
ensure that when the value is read (e.g. for comparison of two
|
||
such values), we only get the good bits, since the unused bits
|
||
are uninitialized. Both goals are accomplished by wrapping up
|
||
the modular type in an enclosing record type. */
|
||
if (Is_Packed_Array_Type (gnat_entity)
|
||
&& Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
|
||
{
|
||
tree gnu_field_type, gnu_field;
|
||
|
||
/* Set the RM size before wrapping up the original type. */
|
||
SET_TYPE_RM_SIZE (gnu_type,
|
||
UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
|
||
TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
|
||
|
||
/* Create a stripped-down declaration, mainly for debugging. */
|
||
create_type_decl (gnu_entity_name, gnu_type, NULL, true,
|
||
debug_info_p, gnat_entity);
|
||
|
||
/* Now save it and build the enclosing record type. */
|
||
gnu_field_type = gnu_type;
|
||
|
||
gnu_type = make_node (RECORD_TYPE);
|
||
TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
|
||
TYPE_PACKED (gnu_type) = 1;
|
||
TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
|
||
TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
|
||
SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
|
||
|
||
/* Propagate the alignment of the modular type to the record type,
|
||
unless there is an alignment clause that under-aligns the type.
|
||
This means that bit-packed arrays are given "ceil" alignment for
|
||
their size by default, which may seem counter-intuitive but makes
|
||
it possible to overlay them on modular types easily. */
|
||
TYPE_ALIGN (gnu_type)
|
||
= align > 0 ? align : TYPE_ALIGN (gnu_field_type);
|
||
|
||
relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
|
||
|
||
/* Don't notify the field as "addressable", since we won't be taking
|
||
it's address and it would prevent create_field_decl from making a
|
||
bitfield. */
|
||
gnu_field
|
||
= create_field_decl (get_identifier ("OBJECT"), gnu_field_type,
|
||
gnu_type, NULL_TREE, bitsize_zero_node, 1, 0);
|
||
|
||
/* Do not emit debug info until after the parallel type is added. */
|
||
finish_record_type (gnu_type, gnu_field, 2, false);
|
||
compute_record_mode (gnu_type);
|
||
TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
|
||
|
||
if (debug_info_p)
|
||
{
|
||
/* Make the original array type a parallel type. */
|
||
if (present_gnu_tree (Original_Array_Type (gnat_entity)))
|
||
add_parallel_type (TYPE_STUB_DECL (gnu_type),
|
||
gnat_to_gnu_type
|
||
(Original_Array_Type (gnat_entity)));
|
||
|
||
rest_of_record_type_compilation (gnu_type);
|
||
}
|
||
}
|
||
|
||
/* If the type we are dealing with has got a smaller alignment than the
|
||
natural one, we need to wrap it up in a record type and under-align
|
||
the latter. We reuse the padding machinery for this purpose. */
|
||
else if (align > 0)
|
||
{
|
||
tree gnu_field_type, gnu_field;
|
||
|
||
/* Set the RM size before wrapping up the type. */
|
||
SET_TYPE_RM_SIZE (gnu_type,
|
||
UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
|
||
|
||
/* Create a stripped-down declaration, mainly for debugging. */
|
||
create_type_decl (gnu_entity_name, gnu_type, NULL, true,
|
||
debug_info_p, gnat_entity);
|
||
|
||
/* Now save it and build the enclosing record type. */
|
||
gnu_field_type = gnu_type;
|
||
|
||
gnu_type = make_node (RECORD_TYPE);
|
||
TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
|
||
TYPE_PACKED (gnu_type) = 1;
|
||
TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
|
||
TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
|
||
SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
|
||
TYPE_ALIGN (gnu_type) = align;
|
||
relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
|
||
|
||
/* Don't notify the field as "addressable", since we won't be taking
|
||
it's address and it would prevent create_field_decl from making a
|
||
bitfield. */
|
||
gnu_field
|
||
= create_field_decl (get_identifier ("F"), gnu_field_type,
|
||
gnu_type, NULL_TREE, bitsize_zero_node, 1, 0);
|
||
|
||
finish_record_type (gnu_type, gnu_field, 2, debug_info_p);
|
||
compute_record_mode (gnu_type);
|
||
TYPE_PADDING_P (gnu_type) = 1;
|
||
}
|
||
|
||
break;
|
||
|
||
case E_Floating_Point_Type:
|
||
/* If this is a VAX floating-point type, use an integer of the proper
|
||
size. All the operations will be handled with ASM statements. */
|
||
if (Vax_Float (gnat_entity))
|
||
{
|
||
gnu_type = make_signed_type (esize);
|
||
TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
|
||
SET_TYPE_DIGITS_VALUE (gnu_type,
|
||
UI_To_gnu (Digits_Value (gnat_entity),
|
||
sizetype));
|
||
break;
|
||
}
|
||
|
||
/* The type of the Low and High bounds can be our type if this is
|
||
a type from Standard, so set them at the end of the function. */
|
||
gnu_type = make_node (REAL_TYPE);
|
||
TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
|
||
layout_type (gnu_type);
|
||
break;
|
||
|
||
case E_Floating_Point_Subtype:
|
||
if (Vax_Float (gnat_entity))
|
||
{
|
||
gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
|
||
break;
|
||
}
|
||
|
||
{
|
||
if (!definition
|
||
&& Present (Ancestor_Subtype (gnat_entity))
|
||
&& !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
|
||
&& (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
|
||
|| !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
|
||
gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
|
||
gnu_expr, 0);
|
||
|
||
gnu_type = make_node (REAL_TYPE);
|
||
TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
|
||
TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
|
||
TYPE_GCC_MIN_VALUE (gnu_type)
|
||
= TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type));
|
||
TYPE_GCC_MAX_VALUE (gnu_type)
|
||
= TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type));
|
||
layout_type (gnu_type);
|
||
|
||
SET_TYPE_RM_MIN_VALUE
|
||
(gnu_type,
|
||
convert (TREE_TYPE (gnu_type),
|
||
elaborate_expression (Type_Low_Bound (gnat_entity),
|
||
gnat_entity, get_identifier ("L"),
|
||
definition, true,
|
||
Needs_Debug_Info (gnat_entity))));
|
||
|
||
SET_TYPE_RM_MAX_VALUE
|
||
(gnu_type,
|
||
convert (TREE_TYPE (gnu_type),
|
||
elaborate_expression (Type_High_Bound (gnat_entity),
|
||
gnat_entity, get_identifier ("U"),
|
||
definition, true,
|
||
Needs_Debug_Info (gnat_entity))));
|
||
|
||
/* One of the above calls might have caused us to be elaborated,
|
||
so don't blow up if so. */
|
||
if (present_gnu_tree (gnat_entity))
|
||
{
|
||
maybe_present = true;
|
||
break;
|
||
}
|
||
|
||
/* Inherit our alias set from what we're a subtype of, as for
|
||
integer subtypes. */
|
||
relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
|
||
}
|
||
break;
|
||
|
||
/* Array and String Types and Subtypes
|
||
|
||
Unconstrained array types are represented by E_Array_Type and
|
||
constrained array types are represented by E_Array_Subtype. There
|
||
are no actual objects of an unconstrained array type; all we have
|
||
are pointers to that type.
|
||
|
||
The following fields are defined on array types and subtypes:
|
||
|
||
Component_Type Component type of the array.
|
||
Number_Dimensions Number of dimensions (an int).
|
||
First_Index Type of first index. */
|
||
|
||
case E_String_Type:
|
||
case E_Array_Type:
|
||
{
|
||
Entity_Id gnat_index, gnat_name;
|
||
const bool convention_fortran_p
|
||
= (Convention (gnat_entity) == Convention_Fortran);
|
||
const int ndim = Number_Dimensions (gnat_entity);
|
||
tree gnu_template_fields = NULL_TREE;
|
||
tree gnu_template_type = make_node (RECORD_TYPE);
|
||
tree gnu_template_reference;
|
||
tree gnu_ptr_template = build_pointer_type (gnu_template_type);
|
||
tree gnu_fat_type = make_node (RECORD_TYPE);
|
||
tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
|
||
tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree));
|
||
tree gnu_max_size = size_one_node, gnu_max_size_unit, tem;
|
||
int index;
|
||
|
||
TYPE_NAME (gnu_template_type)
|
||
= create_concat_name (gnat_entity, "XUB");
|
||
|
||
/* Make a node for the array. If we are not defining the array
|
||
suppress expanding incomplete types. */
|
||
gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
|
||
|
||
if (!definition)
|
||
{
|
||
defer_incomplete_level++;
|
||
this_deferred = true;
|
||
}
|
||
|
||
/* Build the fat pointer type. Use a "void *" object instead of
|
||
a pointer to the array type since we don't have the array type
|
||
yet (it will reference the fat pointer via the bounds). */
|
||
tem = chainon (chainon (NULL_TREE,
|
||
create_field_decl (get_identifier ("P_ARRAY"),
|
||
ptr_void_type_node,
|
||
gnu_fat_type, NULL_TREE,
|
||
NULL_TREE, 0, 0)),
|
||
create_field_decl (get_identifier ("P_BOUNDS"),
|
||
gnu_ptr_template,
|
||
gnu_fat_type, NULL_TREE,
|
||
NULL_TREE, 0, 0));
|
||
|
||
/* Make sure we can put this into a register. */
|
||
TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
|
||
|
||
/* Do not emit debug info for this record type since the types of its
|
||
fields are still incomplete at this point. */
|
||
finish_record_type (gnu_fat_type, tem, 0, false);
|
||
TYPE_FAT_POINTER_P (gnu_fat_type) = 1;
|
||
|
||
/* Build a reference to the template from a PLACEHOLDER_EXPR that
|
||
is the fat pointer. This will be used to access the individual
|
||
fields once we build them. */
|
||
tem = build3 (COMPONENT_REF, gnu_ptr_template,
|
||
build0 (PLACEHOLDER_EXPR, gnu_fat_type),
|
||
TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
|
||
gnu_template_reference
|
||
= build_unary_op (INDIRECT_REF, gnu_template_type, tem);
|
||
TREE_READONLY (gnu_template_reference) = 1;
|
||
|
||
/* Now create the GCC type for each index and add the fields for that
|
||
index to the template. */
|
||
for (index = (convention_fortran_p ? ndim - 1 : 0),
|
||
gnat_index = First_Index (gnat_entity);
|
||
0 <= index && index < ndim;
|
||
index += (convention_fortran_p ? - 1 : 1),
|
||
gnat_index = Next_Index (gnat_index))
|
||
{
|
||
char field_name[16];
|
||
tree gnu_index_base_type
|
||
= get_unpadded_type (Base_Type (Etype (gnat_index)));
|
||
tree gnu_lb_field, gnu_hb_field, gnu_orig_min, gnu_orig_max;
|
||
tree gnu_min, gnu_max, gnu_high;
|
||
|
||
/* Make the FIELD_DECLs for the low and high bounds of this
|
||
type and then make extractions of these fields from the
|
||
template. */
|
||
sprintf (field_name, "LB%d", index);
|
||
gnu_lb_field = create_field_decl (get_identifier (field_name),
|
||
gnu_index_base_type,
|
||
gnu_template_type, NULL_TREE,
|
||
NULL_TREE, 0, 0);
|
||
Sloc_to_locus (Sloc (gnat_entity),
|
||
&DECL_SOURCE_LOCATION (gnu_lb_field));
|
||
|
||
field_name[0] = 'U';
|
||
gnu_hb_field = create_field_decl (get_identifier (field_name),
|
||
gnu_index_base_type,
|
||
gnu_template_type, NULL_TREE,
|
||
NULL_TREE, 0, 0);
|
||
Sloc_to_locus (Sloc (gnat_entity),
|
||
&DECL_SOURCE_LOCATION (gnu_hb_field));
|
||
|
||
gnu_temp_fields[index] = chainon (gnu_lb_field, gnu_hb_field);
|
||
|
||
/* We can't use build_component_ref here since the template type
|
||
isn't complete yet. */
|
||
gnu_orig_min = build3 (COMPONENT_REF, gnu_index_base_type,
|
||
gnu_template_reference, gnu_lb_field,
|
||
NULL_TREE);
|
||
gnu_orig_max = build3 (COMPONENT_REF, gnu_index_base_type,
|
||
gnu_template_reference, gnu_hb_field,
|
||
NULL_TREE);
|
||
TREE_READONLY (gnu_orig_min) = TREE_READONLY (gnu_orig_max) = 1;
|
||
|
||
gnu_min = convert (sizetype, gnu_orig_min);
|
||
gnu_max = convert (sizetype, gnu_orig_max);
|
||
|
||
/* Compute the size of this dimension. See the E_Array_Subtype
|
||
case below for the rationale. */
|
||
gnu_high
|
||
= build3 (COND_EXPR, sizetype,
|
||
build2 (GE_EXPR, boolean_type_node,
|
||
gnu_orig_max, gnu_orig_min),
|
||
gnu_max,
|
||
size_binop (MINUS_EXPR, gnu_min, size_one_node));
|
||
|
||
/* Make a range type with the new range in the Ada base type.
|
||
Then make an index type with the size range in sizetype. */
|
||
gnu_index_types[index]
|
||
= create_index_type (gnu_min, gnu_high,
|
||
create_range_type (gnu_index_base_type,
|
||
gnu_orig_min,
|
||
gnu_orig_max),
|
||
gnat_entity);
|
||
|
||
/* Update the maximum size of the array in elements. */
|
||
if (gnu_max_size)
|
||
{
|
||
tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
|
||
tree gnu_min
|
||
= convert (sizetype, TYPE_MIN_VALUE (gnu_index_type));
|
||
tree gnu_max
|
||
= convert (sizetype, TYPE_MAX_VALUE (gnu_index_type));
|
||
tree gnu_this_max
|
||
= size_binop (MAX_EXPR,
|
||
size_binop (PLUS_EXPR, size_one_node,
|
||
size_binop (MINUS_EXPR,
|
||
gnu_max, gnu_min)),
|
||
size_zero_node);
|
||
|
||
if (TREE_CODE (gnu_this_max) == INTEGER_CST
|
||
&& TREE_OVERFLOW (gnu_this_max))
|
||
gnu_max_size = NULL_TREE;
|
||
else
|
||
gnu_max_size
|
||
= size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
|
||
}
|
||
|
||
TYPE_NAME (gnu_index_types[index])
|
||
= create_concat_name (gnat_entity, field_name);
|
||
}
|
||
|
||
for (index = 0; index < ndim; index++)
|
||
gnu_template_fields
|
||
= chainon (gnu_template_fields, gnu_temp_fields[index]);
|
||
|
||
/* Install all the fields into the template. */
|
||
finish_record_type (gnu_template_type, gnu_template_fields, 0,
|
||
debug_info_p);
|
||
TYPE_READONLY (gnu_template_type) = 1;
|
||
|
||
/* Now make the array of arrays and update the pointer to the array
|
||
in the fat pointer. Note that it is the first field. */
|
||
tem = gnat_to_gnu_component_type (gnat_entity, definition,
|
||
debug_info_p);
|
||
|
||
/* If Component_Size is not already specified, annotate it with the
|
||
size of the component. */
|
||
if (Unknown_Component_Size (gnat_entity))
|
||
Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
|
||
|
||
/* Compute the maximum size of the array in units and bits. */
|
||
if (gnu_max_size)
|
||
{
|
||
gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
|
||
TYPE_SIZE_UNIT (tem));
|
||
gnu_max_size = size_binop (MULT_EXPR,
|
||
convert (bitsizetype, gnu_max_size),
|
||
TYPE_SIZE (tem));
|
||
}
|
||
else
|
||
gnu_max_size_unit = NULL_TREE;
|
||
|
||
/* Now build the array type. */
|
||
for (index = ndim - 1; index >= 0; index--)
|
||
{
|
||
tem = build_array_type (tem, gnu_index_types[index]);
|
||
TYPE_MULTI_ARRAY_P (tem) = (index > 0);
|
||
if (array_type_has_nonaliased_component (tem, gnat_entity))
|
||
TYPE_NONALIASED_COMPONENT (tem) = 1;
|
||
}
|
||
|
||
/* If an alignment is specified, use it if valid. But ignore it
|
||
for the original type of packed array types. If the alignment
|
||
was requested with an explicit alignment clause, state so. */
|
||
if (No (Packed_Array_Type (gnat_entity))
|
||
&& Known_Alignment (gnat_entity))
|
||
{
|
||
TYPE_ALIGN (tem)
|
||
= validate_alignment (Alignment (gnat_entity), gnat_entity,
|
||
TYPE_ALIGN (tem));
|
||
if (Present (Alignment_Clause (gnat_entity)))
|
||
TYPE_USER_ALIGN (tem) = 1;
|
||
}
|
||
|
||
TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p;
|
||
TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
|
||
|
||
/* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
|
||
corresponding fat pointer. */
|
||
TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
|
||
= TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
|
||
SET_TYPE_MODE (gnu_type, BLKmode);
|
||
TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
|
||
SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
|
||
|
||
/* If the maximum size doesn't overflow, use it. */
|
||
if (gnu_max_size
|
||
&& TREE_CODE (gnu_max_size) == INTEGER_CST
|
||
&& !TREE_OVERFLOW (gnu_max_size)
|
||
&& TREE_CODE (gnu_max_size_unit) == INTEGER_CST
|
||
&& !TREE_OVERFLOW (gnu_max_size_unit))
|
||
{
|
||
TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size,
|
||
TYPE_SIZE (tem));
|
||
TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit,
|
||
TYPE_SIZE_UNIT (tem));
|
||
}
|
||
|
||
create_type_decl (create_concat_name (gnat_entity, "XUA"),
|
||
tem, NULL, !Comes_From_Source (gnat_entity),
|
||
debug_info_p, gnat_entity);
|
||
|
||
/* Give the fat pointer type a name. If this is a packed type, tell
|
||
the debugger how to interpret the underlying bits. */
|
||
if (Present (Packed_Array_Type (gnat_entity)))
|
||
gnat_name = Packed_Array_Type (gnat_entity);
|
||
else
|
||
gnat_name = gnat_entity;
|
||
create_type_decl (create_concat_name (gnat_name, "XUP"),
|
||
gnu_fat_type, NULL, true,
|
||
debug_info_p, gnat_entity);
|
||
|
||
/* Create the type to be used as what a thin pointer designates:
|
||
a record type for the object and its template with the fields
|
||
shifted to have the template at a negative offset. */
|
||
tem = build_unc_object_type (gnu_template_type, tem,
|
||
create_concat_name (gnat_name, "XUT"),
|
||
debug_info_p);
|
||
shift_unc_components_for_thin_pointers (tem);
|
||
|
||
SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
|
||
TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
|
||
}
|
||
break;
|
||
|
||
case E_String_Subtype:
|
||
case E_Array_Subtype:
|
||
|
||
/* This is the actual data type for array variables. Multidimensional
|
||
arrays are implemented as arrays of arrays. Note that arrays which
|
||
have sparse enumeration subtypes as index components create sparse
|
||
arrays, which is obviously space inefficient but so much easier to
|
||
code for now.
|
||
|
||
Also note that the subtype never refers to the unconstrained array
|
||
type, which is somewhat at variance with Ada semantics.
|
||
|
||
First check to see if this is simply a renaming of the array type.
|
||
If so, the result is the array type. */
|
||
|
||
gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
|
||
if (!Is_Constrained (gnat_entity))
|
||
;
|
||
else
|
||
{
|
||
Entity_Id gnat_index, gnat_base_index;
|
||
const bool convention_fortran_p
|
||
= (Convention (gnat_entity) == Convention_Fortran);
|
||
const int ndim = Number_Dimensions (gnat_entity);
|
||
tree gnu_base_type = gnu_type;
|
||
tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
|
||
tree gnu_max_size = size_one_node, gnu_max_size_unit;
|
||
bool need_index_type_struct = false;
|
||
int index;
|
||
|
||
/* First create the GCC type for each index and find out whether
|
||
special types are needed for debugging information. */
|
||
for (index = (convention_fortran_p ? ndim - 1 : 0),
|
||
gnat_index = First_Index (gnat_entity),
|
||
gnat_base_index
|
||
= First_Index (Implementation_Base_Type (gnat_entity));
|
||
0 <= index && index < ndim;
|
||
index += (convention_fortran_p ? - 1 : 1),
|
||
gnat_index = Next_Index (gnat_index),
|
||
gnat_base_index = Next_Index (gnat_base_index))
|
||
{
|
||
tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
|
||
tree gnu_orig_min = TYPE_MIN_VALUE (gnu_index_type);
|
||
tree gnu_orig_max = TYPE_MAX_VALUE (gnu_index_type);
|
||
tree gnu_min = convert (sizetype, gnu_orig_min);
|
||
tree gnu_max = convert (sizetype, gnu_orig_max);
|
||
tree gnu_base_index_type
|
||
= get_unpadded_type (Etype (gnat_base_index));
|
||
tree gnu_base_orig_min = TYPE_MIN_VALUE (gnu_base_index_type);
|
||
tree gnu_base_orig_max = TYPE_MAX_VALUE (gnu_base_index_type);
|
||
tree gnu_high;
|
||
|
||
/* See if the base array type is already flat. If it is, we
|
||
are probably compiling an ACATS test but it will cause the
|
||
code below to malfunction if we don't handle it specially. */
|
||
if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST
|
||
&& TREE_CODE (gnu_base_orig_max) == INTEGER_CST
|
||
&& tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min))
|
||
{
|
||
gnu_min = size_one_node;
|
||
gnu_max = size_zero_node;
|
||
gnu_high = gnu_max;
|
||
}
|
||
|
||
/* Similarly, if one of the values overflows in sizetype and the
|
||
range is null, use 1..0 for the sizetype bounds. */
|
||
else if (TREE_CODE (gnu_min) == INTEGER_CST
|
||
&& TREE_CODE (gnu_max) == INTEGER_CST
|
||
&& (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
|
||
&& tree_int_cst_lt (gnu_orig_max, gnu_orig_min))
|
||
{
|
||
gnu_min = size_one_node;
|
||
gnu_max = size_zero_node;
|
||
gnu_high = gnu_max;
|
||
}
|
||
|
||
/* If the minimum and maximum values both overflow in sizetype,
|
||
but the difference in the original type does not overflow in
|
||
sizetype, ignore the overflow indication. */
|
||
else if (TREE_CODE (gnu_min) == INTEGER_CST
|
||
&& TREE_CODE (gnu_max) == INTEGER_CST
|
||
&& TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
|
||
&& !TREE_OVERFLOW
|
||
(convert (sizetype,
|
||
fold_build2 (MINUS_EXPR, gnu_index_type,
|
||
gnu_orig_max,
|
||
gnu_orig_min))))
|
||
{
|
||
TREE_OVERFLOW (gnu_min) = 0;
|
||
TREE_OVERFLOW (gnu_max) = 0;
|
||
gnu_high = gnu_max;
|
||
}
|
||
|
||
/* Compute the size of this dimension in the general case. We
|
||
need to provide GCC with an upper bound to use but have to
|
||
deal with the "superflat" case. There are three ways to do
|
||
this. If we can prove that the array can never be superflat,
|
||
we can just use the high bound of the index type. */
|
||
else if ((Nkind (gnat_index) == N_Range
|
||
&& cannot_be_superflat_p (gnat_index))
|
||
/* Packed Array Types are never superflat. */
|
||
|| Is_Packed_Array_Type (gnat_entity))
|
||
gnu_high = gnu_max;
|
||
|
||
/* Otherwise, if the high bound is constant but the low bound is
|
||
not, we use the expression (hb >= lb) ? lb : hb + 1 for the
|
||
lower bound. Note that the comparison must be done in the
|
||
original type to avoid any overflow during the conversion. */
|
||
else if (TREE_CODE (gnu_max) == INTEGER_CST
|
||
&& TREE_CODE (gnu_min) != INTEGER_CST)
|
||
{
|
||
gnu_high = gnu_max;
|
||
gnu_min
|
||
= build_cond_expr (sizetype,
|
||
build_binary_op (GE_EXPR,
|
||
boolean_type_node,
|
||
gnu_orig_max,
|
||
gnu_orig_min),
|
||
gnu_min,
|
||
size_binop (PLUS_EXPR, gnu_max,
|
||
size_one_node));
|
||
}
|
||
|
||
/* Finally we use (hb >= lb) ? hb : lb - 1 for the upper bound
|
||
in all the other cases. Note that, here as well as above,
|
||
the condition used in the comparison must be equivalent to
|
||
the condition (length != 0). This is relied upon in order
|
||
to optimize array comparisons in compare_arrays. */
|
||
else
|
||
gnu_high
|
||
= build_cond_expr (sizetype,
|
||
build_binary_op (GE_EXPR,
|
||
boolean_type_node,
|
||
gnu_orig_max,
|
||
gnu_orig_min),
|
||
gnu_max,
|
||
size_binop (MINUS_EXPR, gnu_min,
|
||
size_one_node));
|
||
|
||
/* Reuse the index type for the range type. Then make an index
|
||
type with the size range in sizetype. */
|
||
gnu_index_types[index]
|
||
= create_index_type (gnu_min, gnu_high, gnu_index_type,
|
||
gnat_entity);
|
||
|
||
/* Update the maximum size of the array in elements. Here we
|
||
see if any constraint on the index type of the base type
|
||
can be used in the case of self-referential bound on the
|
||
index type of the subtype. We look for a non-"infinite"
|
||
and non-self-referential bound from any type involved and
|
||
handle each bound separately. */
|
||
if (gnu_max_size)
|
||
{
|
||
tree gnu_base_min = convert (sizetype, gnu_base_orig_min);
|
||
tree gnu_base_max = convert (sizetype, gnu_base_orig_max);
|
||
tree gnu_base_index_base_type
|
||
= get_base_type (gnu_base_index_type);
|
||
tree gnu_base_base_min
|
||
= convert (sizetype,
|
||
TYPE_MIN_VALUE (gnu_base_index_base_type));
|
||
tree gnu_base_base_max
|
||
= convert (sizetype,
|
||
TYPE_MAX_VALUE (gnu_base_index_base_type));
|
||
|
||
if (!CONTAINS_PLACEHOLDER_P (gnu_min)
|
||
|| !(TREE_CODE (gnu_base_min) == INTEGER_CST
|
||
&& !TREE_OVERFLOW (gnu_base_min)))
|
||
gnu_base_min = gnu_min;
|
||
|
||
if (!CONTAINS_PLACEHOLDER_P (gnu_max)
|
||
|| !(TREE_CODE (gnu_base_max) == INTEGER_CST
|
||
&& !TREE_OVERFLOW (gnu_base_max)))
|
||
gnu_base_max = gnu_max;
|
||
|
||
if ((TREE_CODE (gnu_base_min) == INTEGER_CST
|
||
&& TREE_OVERFLOW (gnu_base_min))
|
||
|| operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
|
||
|| (TREE_CODE (gnu_base_max) == INTEGER_CST
|
||
&& TREE_OVERFLOW (gnu_base_max))
|
||
|| operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
|
||
gnu_max_size = NULL_TREE;
|
||
else
|
||
{
|
||
tree gnu_this_max
|
||
= size_binop (MAX_EXPR,
|
||
size_binop (PLUS_EXPR, size_one_node,
|
||
size_binop (MINUS_EXPR,
|
||
gnu_base_max,
|
||
gnu_base_min)),
|
||
size_zero_node);
|
||
|
||
if (TREE_CODE (gnu_this_max) == INTEGER_CST
|
||
&& TREE_OVERFLOW (gnu_this_max))
|
||
gnu_max_size = NULL_TREE;
|
||
else
|
||
gnu_max_size
|
||
= size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
|
||
}
|
||
}
|
||
|
||
/* We need special types for debugging information to point to
|
||
the index types if they have variable bounds, are not integer
|
||
types, are biased or are wider than sizetype. */
|
||
if (!integer_onep (gnu_orig_min)
|
||
|| TREE_CODE (gnu_orig_max) != INTEGER_CST
|
||
|| TREE_CODE (gnu_index_type) != INTEGER_TYPE
|
||
|| (TREE_TYPE (gnu_index_type)
|
||
&& TREE_CODE (TREE_TYPE (gnu_index_type))
|
||
!= INTEGER_TYPE)
|
||
|| TYPE_BIASED_REPRESENTATION_P (gnu_index_type)
|
||
|| compare_tree_int (rm_size (gnu_index_type),
|
||
TYPE_PRECISION (sizetype)) > 0)
|
||
need_index_type_struct = true;
|
||
}
|
||
|
||
/* Then flatten: create the array of arrays. For an array type
|
||
used to implement a packed array, get the component type from
|
||
the original array type since the representation clauses that
|
||
can affect it are on the latter. */
|
||
if (Is_Packed_Array_Type (gnat_entity)
|
||
&& !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
|
||
{
|
||
gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
|
||
for (index = ndim - 1; index >= 0; index--)
|
||
gnu_type = TREE_TYPE (gnu_type);
|
||
|
||
/* One of the above calls might have caused us to be elaborated,
|
||
so don't blow up if so. */
|
||
if (present_gnu_tree (gnat_entity))
|
||
{
|
||
maybe_present = true;
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
gnu_type = gnat_to_gnu_component_type (gnat_entity, definition,
|
||
debug_info_p);
|
||
|
||
/* One of the above calls might have caused us to be elaborated,
|
||
so don't blow up if so. */
|
||
if (present_gnu_tree (gnat_entity))
|
||
{
|
||
maybe_present = true;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Compute the maximum size of the array in units and bits. */
|
||
if (gnu_max_size)
|
||
{
|
||
gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
|
||
TYPE_SIZE_UNIT (gnu_type));
|
||
gnu_max_size = size_binop (MULT_EXPR,
|
||
convert (bitsizetype, gnu_max_size),
|
||
TYPE_SIZE (gnu_type));
|
||
}
|
||
else
|
||
gnu_max_size_unit = NULL_TREE;
|
||
|
||
/* Now build the array type. */
|
||
for (index = ndim - 1; index >= 0; index --)
|
||
{
|
||
gnu_type = build_array_type (gnu_type, gnu_index_types[index]);
|
||
TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
|
||
if (array_type_has_nonaliased_component (gnu_type, gnat_entity))
|
||
TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
|
||
}
|
||
|
||
/* Attach the TYPE_STUB_DECL in case we have a parallel type. */
|
||
TYPE_STUB_DECL (gnu_type)
|
||
= create_type_stub_decl (gnu_entity_name, gnu_type);
|
||
|
||
/* If we are at file level and this is a multi-dimensional array,
|
||
we need to make a variable corresponding to the stride of the
|
||
inner dimensions. */
|
||
if (global_bindings_p () && ndim > 1)
|
||
{
|
||
tree gnu_st_name = get_identifier ("ST");
|
||
tree gnu_arr_type;
|
||
|
||
for (gnu_arr_type = TREE_TYPE (gnu_type);
|
||
TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
|
||
gnu_arr_type = TREE_TYPE (gnu_arr_type),
|
||
gnu_st_name = concat_name (gnu_st_name, "ST"))
|
||
{
|
||
tree eltype = TREE_TYPE (gnu_arr_type);
|
||
|
||
TYPE_SIZE (gnu_arr_type)
|
||
= elaborate_expression_1 (TYPE_SIZE (gnu_arr_type),
|
||
gnat_entity, gnu_st_name,
|
||
definition, false);
|
||
|
||
/* ??? For now, store the size as a multiple of the
|
||
alignment of the element type in bytes so that we
|
||
can see the alignment from the tree. */
|
||
TYPE_SIZE_UNIT (gnu_arr_type)
|
||
= elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_arr_type),
|
||
gnat_entity,
|
||
concat_name (gnu_st_name, "A_U"),
|
||
definition, false,
|
||
TYPE_ALIGN (eltype));
|
||
|
||
/* ??? create_type_decl is not invoked on the inner types so
|
||
the MULT_EXPR node built above will never be marked. */
|
||
MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type));
|
||
}
|
||
}
|
||
|
||
/* If we need to write out a record type giving the names of the
|
||
bounds for debugging purposes, do it now and make the record
|
||
type a parallel type. This is not needed for a packed array
|
||
since the bounds are conveyed by the original array type. */
|
||
if (need_index_type_struct
|
||
&& debug_info_p
|
||
&& !Is_Packed_Array_Type (gnat_entity))
|
||
{
|
||
tree gnu_bound_rec = make_node (RECORD_TYPE);
|
||
tree gnu_field_list = NULL_TREE;
|
||
tree gnu_field;
|
||
|
||
TYPE_NAME (gnu_bound_rec)
|
||
= create_concat_name (gnat_entity, "XA");
|
||
|
||
for (index = ndim - 1; index >= 0; index--)
|
||
{
|
||
tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]);
|
||
tree gnu_index_name = TYPE_NAME (gnu_index);
|
||
|
||
if (TREE_CODE (gnu_index_name) == TYPE_DECL)
|
||
gnu_index_name = DECL_NAME (gnu_index_name);
|
||
|
||
/* Make sure to reference the types themselves, and not just
|
||
their names, as the debugger may fall back on them. */
|
||
gnu_field = create_field_decl (gnu_index_name, gnu_index,
|
||
gnu_bound_rec, NULL_TREE,
|
||
NULL_TREE, 0, 0);
|
||
TREE_CHAIN (gnu_field) = gnu_field_list;
|
||
gnu_field_list = gnu_field;
|
||
}
|
||
|
||
finish_record_type (gnu_bound_rec, gnu_field_list, 0, true);
|
||
add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
|
||
}
|
||
|
||
/* Otherwise, for a packed array, make the original array type a
|
||
parallel type. */
|
||
else if (debug_info_p
|
||
&& Is_Packed_Array_Type (gnat_entity)
|
||
&& present_gnu_tree (Original_Array_Type (gnat_entity)))
|
||
add_parallel_type (TYPE_STUB_DECL (gnu_type),
|
||
gnat_to_gnu_type
|
||
(Original_Array_Type (gnat_entity)));
|
||
|
||
TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p;
|
||
TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
|
||
= (Is_Packed_Array_Type (gnat_entity)
|
||
&& Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
|
||
|
||
/* If the size is self-referential and the maximum size doesn't
|
||
overflow, use it. */
|
||
if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
|
||
&& gnu_max_size
|
||
&& !(TREE_CODE (gnu_max_size) == INTEGER_CST
|
||
&& TREE_OVERFLOW (gnu_max_size))
|
||
&& !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
|
||
&& TREE_OVERFLOW (gnu_max_size_unit)))
|
||
{
|
||
TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
|
||
TYPE_SIZE (gnu_type));
|
||
TYPE_SIZE_UNIT (gnu_type)
|
||
= size_binop (MIN_EXPR, gnu_max_size_unit,
|
||
TYPE_SIZE_UNIT (gnu_type));
|
||
}
|
||
|
||
/* Set our alias set to that of our base type. This gives all
|
||
array subtypes the same alias set. */
|
||
relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
|
||
|
||
/* If this is a packed type, make this type the same as the packed
|
||
array type, but do some adjusting in the type first. */
|
||
if (Present (Packed_Array_Type (gnat_entity)))
|
||
{
|
||
Entity_Id gnat_index;
|
||
tree gnu_inner;
|
||
|
||
/* First finish the type we had been making so that we output
|
||
debugging information for it. */
|
||
if (Treat_As_Volatile (gnat_entity))
|
||
gnu_type
|
||
= build_qualified_type (gnu_type,
|
||
TYPE_QUALS (gnu_type)
|
||
| TYPE_QUAL_VOLATILE);
|
||
|
||
/* Make it artificial only if the base type was artificial too.
|
||
That's sort of "morally" true and will make it possible for
|
||
the debugger to look it up by name in DWARF, which is needed
|
||
in order to decode the packed array type. */
|
||
gnu_decl
|
||
= create_type_decl (gnu_entity_name, gnu_type, attr_list,
|
||
!Comes_From_Source (Etype (gnat_entity))
|
||
&& !Comes_From_Source (gnat_entity),
|
||
debug_info_p, gnat_entity);
|
||
|
||
/* Save it as our equivalent in case the call below elaborates
|
||
this type again. */
|
||
save_gnu_tree (gnat_entity, gnu_decl, false);
|
||
|
||
gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
|
||
NULL_TREE, 0);
|
||
this_made_decl = true;
|
||
gnu_type = TREE_TYPE (gnu_decl);
|
||
save_gnu_tree (gnat_entity, NULL_TREE, false);
|
||
|
||
gnu_inner = gnu_type;
|
||
while (TREE_CODE (gnu_inner) == RECORD_TYPE
|
||
&& (TYPE_JUSTIFIED_MODULAR_P (gnu_inner)
|
||
|| TYPE_PADDING_P (gnu_inner)))
|
||
gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner));
|
||
|
||
/* We need to attach the index type to the type we just made so
|
||
that the actual bounds can later be put into a template. */
|
||
if ((TREE_CODE (gnu_inner) == ARRAY_TYPE
|
||
&& !TYPE_ACTUAL_BOUNDS (gnu_inner))
|
||
|| (TREE_CODE (gnu_inner) == INTEGER_TYPE
|
||
&& !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner)))
|
||
{
|
||
if (TREE_CODE (gnu_inner) == INTEGER_TYPE)
|
||
{
|
||
/* The TYPE_ACTUAL_BOUNDS field is overloaded with the
|
||
TYPE_MODULUS for modular types so we make an extra
|
||
subtype if necessary. */
|
||
if (TYPE_MODULAR_P (gnu_inner))
|
||
{
|
||
tree gnu_subtype
|
||
= make_unsigned_type (TYPE_PRECISION (gnu_inner));
|
||
TREE_TYPE (gnu_subtype) = gnu_inner;
|
||
TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
|
||
SET_TYPE_RM_MIN_VALUE (gnu_subtype,
|
||
TYPE_MIN_VALUE (gnu_inner));
|
||
SET_TYPE_RM_MAX_VALUE (gnu_subtype,
|
||
TYPE_MAX_VALUE (gnu_inner));
|
||
gnu_inner = gnu_subtype;
|
||
}
|
||
|
||
TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1;
|
||
|
||
#ifdef ENABLE_CHECKING
|
||
/* Check for other cases of overloading. */
|
||
gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner));
|
||
#endif
|
||
}
|
||
|
||
for (gnat_index = First_Index (gnat_entity);
|
||
Present (gnat_index);
|
||
gnat_index = Next_Index (gnat_index))
|
||
SET_TYPE_ACTUAL_BOUNDS
|
||
(gnu_inner,
|
||
tree_cons (NULL_TREE,
|
||
get_unpadded_type (Etype (gnat_index)),
|
||
TYPE_ACTUAL_BOUNDS (gnu_inner)));
|
||
|
||
if (Convention (gnat_entity) != Convention_Fortran)
|
||
SET_TYPE_ACTUAL_BOUNDS
|
||
(gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner)));
|
||
|
||
if (TREE_CODE (gnu_type) == RECORD_TYPE
|
||
&& TYPE_JUSTIFIED_MODULAR_P (gnu_type))
|
||
TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner;
|
||
}
|
||
}
|
||
|
||
else
|
||
/* Abort if packed array with no Packed_Array_Type field set. */
|
||
gcc_assert (!Is_Packed (gnat_entity));
|
||
}
|
||
break;
|
||
|
||
case E_String_Literal_Subtype:
|
||
/* Create the type for a string literal. */
|
||
{
|
||
Entity_Id gnat_full_type
|
||
= (IN (Ekind (Etype (gnat_entity)), Private_Kind)
|
||
&& Present (Full_View (Etype (gnat_entity)))
|
||
? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
|
||
tree gnu_string_type = get_unpadded_type (gnat_full_type);
|
||
tree gnu_string_array_type
|
||
= TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
|
||
tree gnu_string_index_type
|
||
= get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
|
||
(TYPE_DOMAIN (gnu_string_array_type))));
|
||
tree gnu_lower_bound
|
||
= convert (gnu_string_index_type,
|
||
gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
|
||
int length = UI_To_Int (String_Literal_Length (gnat_entity));
|
||
tree gnu_length = ssize_int (length - 1);
|
||
tree gnu_upper_bound
|
||
= build_binary_op (PLUS_EXPR, gnu_string_index_type,
|
||
gnu_lower_bound,
|
||
convert (gnu_string_index_type, gnu_length));
|
||
tree gnu_index_type
|
||
= create_index_type (convert (sizetype, gnu_lower_bound),
|
||
convert (sizetype, gnu_upper_bound),
|
||
create_range_type (gnu_string_index_type,
|
||
gnu_lower_bound,
|
||
gnu_upper_bound),
|
||
gnat_entity);
|
||
|
||
gnu_type
|
||
= build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
|
||
gnu_index_type);
|
||
if (array_type_has_nonaliased_component (gnu_type, gnat_entity))
|
||
TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
|
||
relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
|
||
}
|
||
break;
|
||
|
||
/* Record Types and Subtypes
|
||
|
||
The following fields are defined on record types:
|
||
|
||
Has_Discriminants True if the record has discriminants
|
||
First_Discriminant Points to head of list of discriminants
|
||
First_Entity Points to head of list of fields
|
||
Is_Tagged_Type True if the record is tagged
|
||
|
||
Implementation of Ada records and discriminated records:
|
||
|
||
A record type definition is transformed into the equivalent of a C
|
||
struct definition. The fields that are the discriminants which are
|
||
found in the Full_Type_Declaration node and the elements of the
|
||
Component_List found in the Record_Type_Definition node. The
|
||
Component_List can be a recursive structure since each Variant of
|
||
the Variant_Part of the Component_List has a Component_List.
|
||
|
||
Processing of a record type definition comprises starting the list of
|
||
field declarations here from the discriminants and the calling the
|
||
function components_to_record to add the rest of the fields from the
|
||
component list and return the gnu type node. The function
|
||
components_to_record will call itself recursively as it traverses
|
||
the tree. */
|
||
|
||
case E_Record_Type:
|
||
if (Has_Complex_Representation (gnat_entity))
|
||
{
|
||
gnu_type
|
||
= build_complex_type
|
||
(get_unpadded_type
|
||
(Etype (Defining_Entity
|
||
(First (Component_Items
|
||
(Component_List
|
||
(Type_Definition
|
||
(Declaration_Node (gnat_entity)))))))));
|
||
|
||
break;
|
||
}
|
||
|
||
{
|
||
Node_Id full_definition = Declaration_Node (gnat_entity);
|
||
Node_Id record_definition = Type_Definition (full_definition);
|
||
Entity_Id gnat_field;
|
||
tree gnu_field, gnu_field_list = NULL_TREE, gnu_get_parent;
|
||
/* Set PACKED in keeping with gnat_to_gnu_field. */
|
||
int packed
|
||
= Is_Packed (gnat_entity)
|
||
? 1
|
||
: Component_Alignment (gnat_entity) == Calign_Storage_Unit
|
||
? -1
|
||
: (Known_Alignment (gnat_entity)
|
||
|| (Strict_Alignment (gnat_entity)
|
||
&& Known_Static_Esize (gnat_entity)))
|
||
? -2
|
||
: 0;
|
||
bool has_discr = Has_Discriminants (gnat_entity);
|
||
bool has_rep = Has_Specified_Layout (gnat_entity);
|
||
bool all_rep = has_rep;
|
||
bool is_extension
|
||
= (Is_Tagged_Type (gnat_entity)
|
||
&& Nkind (record_definition) == N_Derived_Type_Definition);
|
||
bool is_unchecked_union = Is_Unchecked_Union (gnat_entity);
|
||
|
||
/* See if all fields have a rep clause. Stop when we find one
|
||
that doesn't. */
|
||
if (all_rep)
|
||
for (gnat_field = First_Entity (gnat_entity);
|
||
Present (gnat_field);
|
||
gnat_field = Next_Entity (gnat_field))
|
||
if ((Ekind (gnat_field) == E_Component
|
||
|| Ekind (gnat_field) == E_Discriminant)
|
||
&& No (Component_Clause (gnat_field)))
|
||
{
|
||
all_rep = false;
|
||
break;
|
||
}
|
||
|
||
/* If this is a record extension, go a level further to find the
|
||
record definition. Also, verify we have a Parent_Subtype. */
|
||
if (is_extension)
|
||
{
|
||
if (!type_annotate_only
|
||
|| Present (Record_Extension_Part (record_definition)))
|
||
record_definition = Record_Extension_Part (record_definition);
|
||
|
||
gcc_assert (type_annotate_only
|
||
|| Present (Parent_Subtype (gnat_entity)));
|
||
}
|
||
|
||
/* Make a node for the record. If we are not defining the record,
|
||
suppress expanding incomplete types. */
|
||
gnu_type = make_node (tree_code_for_record_type (gnat_entity));
|
||
TYPE_NAME (gnu_type) = gnu_entity_name;
|
||
TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
|
||
|
||
if (!definition)
|
||
{
|
||
defer_incomplete_level++;
|
||
this_deferred = true;
|
||
}
|
||
|
||
/* If both a size and rep clause was specified, put the size in
|
||
the record type now so that it can get the proper mode. */
|
||
if (has_rep && Known_Esize (gnat_entity))
|
||
TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
|
||
|
||
/* Always set the alignment here so that it can be used to
|
||
set the mode, if it is making the alignment stricter. If
|
||
it is invalid, it will be checked again below. If this is to
|
||
be Atomic, choose a default alignment of a word unless we know
|
||
the size and it's smaller. */
|
||
if (Known_Alignment (gnat_entity))
|
||
TYPE_ALIGN (gnu_type)
|
||
= validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
|
||
else if (Is_Atomic (gnat_entity))
|
||
TYPE_ALIGN (gnu_type)
|
||
= esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
|
||
/* If a type needs strict alignment, the minimum size will be the
|
||
type size instead of the RM size (see validate_size). Cap the
|
||
alignment, lest it causes this type size to become too large. */
|
||
else if (Strict_Alignment (gnat_entity)
|
||
&& Known_Static_Esize (gnat_entity))
|
||
{
|
||
unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
|
||
unsigned int raw_align = raw_size & -raw_size;
|
||
if (raw_align < BIGGEST_ALIGNMENT)
|
||
TYPE_ALIGN (gnu_type) = raw_align;
|
||
}
|
||
else
|
||
TYPE_ALIGN (gnu_type) = 0;
|
||
|
||
/* If we have a Parent_Subtype, make a field for the parent. If
|
||
this record has rep clauses, force the position to zero. */
|
||
if (Present (Parent_Subtype (gnat_entity)))
|
||
{
|
||
Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
|
||
tree gnu_parent;
|
||
|
||
/* A major complexity here is that the parent subtype will
|
||
reference our discriminants in its Discriminant_Constraint
|
||
list. But those must reference the parent component of this
|
||
record which is of the parent subtype we have not built yet!
|
||
To break the circle we first build a dummy COMPONENT_REF which
|
||
represents the "get to the parent" operation and initialize
|
||
each of those discriminants to a COMPONENT_REF of the above
|
||
dummy parent referencing the corresponding discriminant of the
|
||
base type of the parent subtype. */
|
||
gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
|
||
build0 (PLACEHOLDER_EXPR, gnu_type),
|
||
build_decl (input_location,
|
||
FIELD_DECL, NULL_TREE,
|
||
void_type_node),
|
||
NULL_TREE);
|
||
|
||
if (has_discr)
|
||
for (gnat_field = First_Stored_Discriminant (gnat_entity);
|
||
Present (gnat_field);
|
||
gnat_field = Next_Stored_Discriminant (gnat_field))
|
||
if (Present (Corresponding_Discriminant (gnat_field)))
|
||
{
|
||
tree gnu_field
|
||
= gnat_to_gnu_field_decl (Corresponding_Discriminant
|
||
(gnat_field));
|
||
save_gnu_tree
|
||
(gnat_field,
|
||
build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
|
||
gnu_get_parent, gnu_field, NULL_TREE),
|
||
true);
|
||
}
|
||
|
||
/* Then we build the parent subtype. If it has discriminants but
|
||
the type itself has unknown discriminants, this means that it
|
||
doesn't contain information about how the discriminants are
|
||
derived from those of the ancestor type, so it cannot be used
|
||
directly. Instead it is built by cloning the parent subtype
|
||
of the underlying record view of the type, for which the above
|
||
derivation of discriminants has been made explicit. */
|
||
if (Has_Discriminants (gnat_parent)
|
||
&& Has_Unknown_Discriminants (gnat_entity))
|
||
{
|
||
Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
|
||
|
||
/* If we are defining the type, the underlying record
|
||
view must already have been elaborated at this point.
|
||
Otherwise do it now as its parent subtype cannot be
|
||
technically elaborated on its own. */
|
||
if (definition)
|
||
gcc_assert (present_gnu_tree (gnat_uview));
|
||
else
|
||
gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
|
||
|
||
gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
|
||
|
||
/* Substitute the "get to the parent" of the type for that
|
||
of its underlying record view in the cloned type. */
|
||
for (gnat_field = First_Stored_Discriminant (gnat_uview);
|
||
Present (gnat_field);
|
||
gnat_field = Next_Stored_Discriminant (gnat_field))
|
||
if (Present (Corresponding_Discriminant (gnat_field)))
|
||
{
|
||
tree gnu_field = gnat_to_gnu_field_decl (gnat_field);
|
||
tree gnu_ref
|
||
= build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
|
||
gnu_get_parent, gnu_field, NULL_TREE);
|
||
gnu_parent
|
||
= substitute_in_type (gnu_parent, gnu_field, gnu_ref);
|
||
}
|
||
}
|
||
else
|
||
gnu_parent = gnat_to_gnu_type (gnat_parent);
|
||
|
||
/* Finally we fix up both kinds of twisted COMPONENT_REF we have
|
||
initially built. The discriminants must reference the fields
|
||
of the parent subtype and not those of its base type for the
|
||
placeholder machinery to properly work. */
|
||
if (has_discr)
|
||
{
|
||
/* The actual parent subtype is the full view. */
|
||
if (IN (Ekind (gnat_parent), Private_Kind))
|
||
{
|
||
if (Present (Full_View (gnat_parent)))
|
||
gnat_parent = Full_View (gnat_parent);
|
||
else
|
||
gnat_parent = Underlying_Full_View (gnat_parent);
|
||
}
|
||
|
||
for (gnat_field = First_Stored_Discriminant (gnat_entity);
|
||
Present (gnat_field);
|
||
gnat_field = Next_Stored_Discriminant (gnat_field))
|
||
if (Present (Corresponding_Discriminant (gnat_field)))
|
||
{
|
||
Entity_Id field = Empty;
|
||
for (field = First_Stored_Discriminant (gnat_parent);
|
||
Present (field);
|
||
field = Next_Stored_Discriminant (field))
|
||
if (same_discriminant_p (gnat_field, field))
|
||
break;
|
||
gcc_assert (Present (field));
|
||
TREE_OPERAND (get_gnu_tree (gnat_field), 1)
|
||
= gnat_to_gnu_field_decl (field);
|
||
}
|
||
}
|
||
|
||
/* The "get to the parent" COMPONENT_REF must be given its
|
||
proper type... */
|
||
TREE_TYPE (gnu_get_parent) = gnu_parent;
|
||
|
||
/* ...and reference the _Parent field of this record. */
|
||
gnu_field
|
||
= create_field_decl (parent_name_id,
|
||
gnu_parent, gnu_type,
|
||
has_rep
|
||
? TYPE_SIZE (gnu_parent) : NULL_TREE,
|
||
has_rep
|
||
? bitsize_zero_node : NULL_TREE,
|
||
0, 1);
|
||
DECL_INTERNAL_P (gnu_field) = 1;
|
||
TREE_OPERAND (gnu_get_parent, 1) = gnu_field;
|
||
TYPE_FIELDS (gnu_type) = gnu_field;
|
||
}
|
||
|
||
/* Make the fields for the discriminants and put them into the record
|
||
unless it's an Unchecked_Union. */
|
||
if (has_discr)
|
||
for (gnat_field = First_Stored_Discriminant (gnat_entity);
|
||
Present (gnat_field);
|
||
gnat_field = Next_Stored_Discriminant (gnat_field))
|
||
{
|
||
/* If this is a record extension and this discriminant is the
|
||
renaming of another discriminant, we've handled it above. */
|
||
if (Present (Parent_Subtype (gnat_entity))
|
||
&& Present (Corresponding_Discriminant (gnat_field)))
|
||
continue;
|
||
|
||
gnu_field
|
||
= gnat_to_gnu_field (gnat_field, gnu_type, packed, definition,
|
||
debug_info_p);
|
||
|
||
/* Make an expression using a PLACEHOLDER_EXPR from the
|
||
FIELD_DECL node just created and link that with the
|
||
corresponding GNAT defining identifier. */
|
||
save_gnu_tree (gnat_field,
|
||
build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
|
||
build0 (PLACEHOLDER_EXPR, gnu_type),
|
||
gnu_field, NULL_TREE),
|
||
true);
|
||
|
||
if (!is_unchecked_union)
|
||
{
|
||
TREE_CHAIN (gnu_field) = gnu_field_list;
|
||
gnu_field_list = gnu_field;
|
||
}
|
||
}
|
||
|
||
/* Add the fields into the record type and finish it up. */
|
||
components_to_record (gnu_type, Component_List (record_definition),
|
||
gnu_field_list, packed, definition, NULL,
|
||
false, all_rep, is_unchecked_union,
|
||
debug_info_p, false);
|
||
|
||
/* If it is passed by reference, force BLKmode to ensure that objects
|
||
of this type will always be put in memory. */
|
||
if (Is_By_Reference_Type (gnat_entity))
|
||
SET_TYPE_MODE (gnu_type, BLKmode);
|
||
|
||
/* We used to remove the associations of the discriminants and _Parent
|
||
for validity checking but we may need them if there's a Freeze_Node
|
||
for a subtype used in this record. */
|
||
TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
|
||
|
||
/* Fill in locations of fields. */
|
||
annotate_rep (gnat_entity, gnu_type);
|
||
|
||
/* If there are any entities in the chain corresponding to components
|
||
that we did not elaborate, ensure we elaborate their types if they
|
||
are Itypes. */
|
||
for (gnat_temp = First_Entity (gnat_entity);
|
||
Present (gnat_temp);
|
||
gnat_temp = Next_Entity (gnat_temp))
|
||
if ((Ekind (gnat_temp) == E_Component
|
||
|| Ekind (gnat_temp) == E_Discriminant)
|
||
&& Is_Itype (Etype (gnat_temp))
|
||
&& !present_gnu_tree (gnat_temp))
|
||
gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
|
||
}
|
||
break;
|
||
|
||
case E_Class_Wide_Subtype:
|
||
/* If an equivalent type is present, that is what we should use.
|
||
Otherwise, fall through to handle this like a record subtype
|
||
since it may have constraints. */
|
||
if (gnat_equiv_type != gnat_entity)
|
||
{
|
||
gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
|
||
maybe_present = true;
|
||
break;
|
||
}
|
||
|
||
/* ... fall through ... */
|
||
|
||
case E_Record_Subtype:
|
||
/* If Cloned_Subtype is Present it means this record subtype has
|
||
identical layout to that type or subtype and we should use
|
||
that GCC type for this one. The front end guarantees that
|
||
the component list is shared. */
|
||
if (Present (Cloned_Subtype (gnat_entity)))
|
||
{
|
||
gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
|
||
NULL_TREE, 0);
|
||
maybe_present = true;
|
||
break;
|
||
}
|
||
|
||
/* Otherwise, first ensure the base type is elaborated. Then, if we are
|
||
changing the type, make a new type with each field having the type of
|
||
the field in the new subtype but the position computed by transforming
|
||
every discriminant reference according to the constraints. We don't
|
||
see any difference between private and non-private type here since
|
||
derivations from types should have been deferred until the completion
|
||
of the private type. */
|
||
else
|
||
{
|
||
Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
|
||
tree gnu_base_type;
|
||
|
||
if (!definition)
|
||
{
|
||
defer_incomplete_level++;
|
||
this_deferred = true;
|
||
}
|
||
|
||
gnu_base_type = gnat_to_gnu_type (gnat_base_type);
|
||
|
||
if (present_gnu_tree (gnat_entity))
|
||
{
|
||
maybe_present = true;
|
||
break;
|
||
}
|
||
|
||
/* If this is a record subtype associated with a dispatch table,
|
||
strip the suffix. This is necessary to make sure 2 different
|
||
subtypes associated with the imported and exported views of a
|
||
dispatch table are properly merged in LTO mode. */
|
||
if (Is_Dispatch_Table_Entity (gnat_entity))
|
||
{
|
||
char *p;
|
||
Get_Encoded_Name (gnat_entity);
|
||
p = strchr (Name_Buffer, '_');
|
||
gcc_assert (p);
|
||
strcpy (p+2, "dtS");
|
||
gnu_entity_name = get_identifier (Name_Buffer);
|
||
}
|
||
|
||
/* When the subtype has discriminants and these discriminants affect
|
||
the initial shape it has inherited, factor them in. But for an
|
||
Unchecked_Union (it must be an Itype), just return the type.
|
||
We can't just test Is_Constrained because private subtypes without
|
||
discriminants of types with discriminants with default expressions
|
||
are Is_Constrained but aren't constrained! */
|
||
if (IN (Ekind (gnat_base_type), Record_Kind)
|
||
&& !Is_Unchecked_Union (gnat_base_type)
|
||
&& !Is_For_Access_Subtype (gnat_entity)
|
||
&& Is_Constrained (gnat_entity)
|
||
&& Has_Discriminants (gnat_entity)
|
||
&& Present (Discriminant_Constraint (gnat_entity))
|
||
&& Stored_Constraint (gnat_entity) != No_Elist)
|
||
{
|
||
tree gnu_subst_list
|
||
= build_subst_list (gnat_entity, gnat_base_type, definition);
|
||
tree gnu_unpad_base_type, gnu_rep_part, gnu_variant_part, t;
|
||
tree gnu_variant_list, gnu_pos_list, gnu_field_list = NULL_TREE;
|
||
bool selected_variant = false;
|
||
Entity_Id gnat_field;
|
||
|
||
gnu_type = make_node (RECORD_TYPE);
|
||
TYPE_NAME (gnu_type) = gnu_entity_name;
|
||
|
||
/* Set the size, alignment and alias set of the new type to
|
||
match that of the old one, doing required substitutions. */
|
||
copy_and_substitute_in_size (gnu_type, gnu_base_type,
|
||
gnu_subst_list);
|
||
|
||
if (TYPE_IS_PADDING_P (gnu_base_type))
|
||
gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
|
||
else
|
||
gnu_unpad_base_type = gnu_base_type;
|
||
|
||
/* Look for a REP part in the base type. */
|
||
gnu_rep_part = get_rep_part (gnu_unpad_base_type);
|
||
|
||
/* Look for a variant part in the base type. */
|
||
gnu_variant_part = get_variant_part (gnu_unpad_base_type);
|
||
|
||
/* If there is a variant part, we must compute whether the
|
||
constraints statically select a particular variant. If
|
||
so, we simply drop the qualified union and flatten the
|
||
list of fields. Otherwise we'll build a new qualified
|
||
union for the variants that are still relevant. */
|
||
if (gnu_variant_part)
|
||
{
|
||
gnu_variant_list
|
||
= build_variant_list (TREE_TYPE (gnu_variant_part),
|
||
gnu_subst_list, NULL_TREE);
|
||
|
||
/* If all the qualifiers are unconditionally true, the
|
||
innermost variant is statically selected. */
|
||
selected_variant = true;
|
||
for (t = gnu_variant_list; t; t = TREE_CHAIN (t))
|
||
if (!integer_onep (TREE_VEC_ELT (TREE_VALUE (t), 1)))
|
||
{
|
||
selected_variant = false;
|
||
break;
|
||
}
|
||
|
||
/* Otherwise, create the new variants. */
|
||
if (!selected_variant)
|
||
for (t = gnu_variant_list; t; t = TREE_CHAIN (t))
|
||
{
|
||
tree old_variant = TREE_PURPOSE (t);
|
||
tree new_variant = make_node (RECORD_TYPE);
|
||
TYPE_NAME (new_variant)
|
||
= DECL_NAME (TYPE_NAME (old_variant));
|
||
copy_and_substitute_in_size (new_variant, old_variant,
|
||
gnu_subst_list);
|
||
TREE_VEC_ELT (TREE_VALUE (t), 2) = new_variant;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
gnu_variant_list = NULL_TREE;
|
||
selected_variant = false;
|
||
}
|
||
|
||
gnu_pos_list
|
||
= build_position_list (gnu_unpad_base_type,
|
||
gnu_variant_list && !selected_variant,
|
||
size_zero_node, bitsize_zero_node,
|
||
BIGGEST_ALIGNMENT, NULL_TREE);
|
||
|
||
for (gnat_field = First_Entity (gnat_entity);
|
||
Present (gnat_field);
|
||
gnat_field = Next_Entity (gnat_field))
|
||
if ((Ekind (gnat_field) == E_Component
|
||
|| Ekind (gnat_field) == E_Discriminant)
|
||
&& !(Present (Corresponding_Discriminant (gnat_field))
|
||
&& Is_Tagged_Type (gnat_base_type))
|
||
&& Underlying_Type (Scope (Original_Record_Component
|
||
(gnat_field)))
|
||
== gnat_base_type)
|
||
{
|
||
Name_Id gnat_name = Chars (gnat_field);
|
||
Entity_Id gnat_old_field
|
||
= Original_Record_Component (gnat_field);
|
||
tree gnu_old_field
|
||
= gnat_to_gnu_field_decl (gnat_old_field);
|
||
tree gnu_context = DECL_CONTEXT (gnu_old_field);
|
||
tree gnu_field, gnu_field_type, gnu_size;
|
||
tree gnu_cont_type, gnu_last = NULL_TREE;
|
||
|
||
/* If the type is the same, retrieve the GCC type from the
|
||
old field to take into account possible adjustments. */
|
||
if (Etype (gnat_field) == Etype (gnat_old_field))
|
||
gnu_field_type = TREE_TYPE (gnu_old_field);
|
||
else
|
||
gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
|
||
|
||
/* If there was a component clause, the field types must be
|
||
the same for the type and subtype, so copy the data from
|
||
the old field to avoid recomputation here. Also if the
|
||
field is justified modular and the optimization in
|
||
gnat_to_gnu_field was applied. */
|
||
if (Present (Component_Clause (gnat_old_field))
|
||
|| (TREE_CODE (gnu_field_type) == RECORD_TYPE
|
||
&& TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
|
||
&& TREE_TYPE (TYPE_FIELDS (gnu_field_type))
|
||
== TREE_TYPE (gnu_old_field)))
|
||
{
|
||
gnu_size = DECL_SIZE (gnu_old_field);
|
||
gnu_field_type = TREE_TYPE (gnu_old_field);
|
||
}
|
||
|
||
/* If the old field was packed and of constant size, we
|
||
have to get the old size here, as it might differ from
|
||
what the Etype conveys and the latter might overlap
|
||
onto the following field. Try to arrange the type for
|
||
possible better packing along the way. */
|
||
else if (DECL_PACKED (gnu_old_field)
|
||
&& TREE_CODE (DECL_SIZE (gnu_old_field))
|
||
== INTEGER_CST)
|
||
{
|
||
gnu_size = DECL_SIZE (gnu_old_field);
|
||
if (TREE_CODE (gnu_field_type) == RECORD_TYPE
|
||
&& !TYPE_FAT_POINTER_P (gnu_field_type)
|
||
&& host_integerp (TYPE_SIZE (gnu_field_type), 1))
|
||
gnu_field_type
|
||
= make_packable_type (gnu_field_type, true);
|
||
}
|
||
|
||
else
|
||
gnu_size = TYPE_SIZE (gnu_field_type);
|
||
|
||
/* If the context of the old field is the base type or its
|
||
REP part (if any), put the field directly in the new
|
||
type; otherwise look up the context in the variant list
|
||
and put the field either in the new type if there is a
|
||
selected variant or in one of the new variants. */
|
||
if (gnu_context == gnu_unpad_base_type
|
||
|| (gnu_rep_part
|
||
&& gnu_context == TREE_TYPE (gnu_rep_part)))
|
||
gnu_cont_type = gnu_type;
|
||
else
|
||
{
|
||
t = purpose_member (gnu_context, gnu_variant_list);
|
||
if (t)
|
||
{
|
||
if (selected_variant)
|
||
gnu_cont_type = gnu_type;
|
||
else
|
||
gnu_cont_type = TREE_VEC_ELT (TREE_VALUE (t), 2);
|
||
}
|
||
else
|
||
/* The front-end may pass us "ghost" components if
|
||
it fails to recognize that a constrained subtype
|
||
is statically constrained. Discard them. */
|
||
continue;
|
||
}
|
||
|
||
/* Now create the new field modeled on the old one. */
|
||
gnu_field
|
||
= create_field_decl_from (gnu_old_field, gnu_field_type,
|
||
gnu_cont_type, gnu_size,
|
||
gnu_pos_list, gnu_subst_list);
|
||
|
||
/* Put it in one of the new variants directly. */
|
||
if (gnu_cont_type != gnu_type)
|
||
{
|
||
TREE_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type);
|
||
TYPE_FIELDS (gnu_cont_type) = gnu_field;
|
||
}
|
||
|
||
/* To match the layout crafted in components_to_record,
|
||
if this is the _Tag or _Parent field, put it before
|
||
any other fields. */
|
||
else if (gnat_name == Name_uTag
|
||
|| gnat_name == Name_uParent)
|
||
gnu_field_list = chainon (gnu_field_list, gnu_field);
|
||
|
||
/* Similarly, if this is the _Controller field, put
|
||
it before the other fields except for the _Tag or
|
||
_Parent field. */
|
||
else if (gnat_name == Name_uController && gnu_last)
|
||
{
|
||
TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
|
||
TREE_CHAIN (gnu_last) = gnu_field;
|
||
}
|
||
|
||
/* Otherwise, if this is a regular field, put it after
|
||
the other fields. */
|
||
else
|
||
{
|
||
TREE_CHAIN (gnu_field) = gnu_field_list;
|
||
gnu_field_list = gnu_field;
|
||
if (!gnu_last)
|
||
gnu_last = gnu_field;
|
||
}
|
||
|
||
save_gnu_tree (gnat_field, gnu_field, false);
|
||
}
|
||
|
||
/* If there is a variant list and no selected variant, we need
|
||
to create the nest of variant parts from the old nest. */
|
||
if (gnu_variant_list && !selected_variant)
|
||
{
|
||
tree new_variant_part
|
||
= create_variant_part_from (gnu_variant_part,
|
||
gnu_variant_list, gnu_type,
|
||
gnu_pos_list, gnu_subst_list);
|
||
TREE_CHAIN (new_variant_part) = gnu_field_list;
|
||
gnu_field_list = new_variant_part;
|
||
}
|
||
|
||
/* Now go through the entities again looking for Itypes that
|
||
we have not elaborated but should (e.g., Etypes of fields
|
||
that have Original_Components). */
|
||
for (gnat_field = First_Entity (gnat_entity);
|
||
Present (gnat_field); gnat_field = Next_Entity (gnat_field))
|
||
if ((Ekind (gnat_field) == E_Discriminant
|
||
|| Ekind (gnat_field) == E_Component)
|
||
&& !present_gnu_tree (Etype (gnat_field)))
|
||
gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
|
||
|
||
/* Do not emit debug info for the type yet since we're going to
|
||
modify it below. */
|
||
gnu_field_list = nreverse (gnu_field_list);
|
||
finish_record_type (gnu_type, gnu_field_list, 2, false);
|
||
|
||
/* See the E_Record_Type case for the rationale. */
|
||
if (Is_By_Reference_Type (gnat_entity))
|
||
SET_TYPE_MODE (gnu_type, BLKmode);
|
||
else
|
||
compute_record_mode (gnu_type);
|
||
|
||
TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
|
||
|
||
/* Fill in locations of fields. */
|
||
annotate_rep (gnat_entity, gnu_type);
|
||
|
||
/* If debugging information is being written for the type, write
|
||
a record that shows what we are a subtype of and also make a
|
||
variable that indicates our size, if still variable. */
|
||
if (debug_info_p)
|
||
{
|
||
tree gnu_subtype_marker = make_node (RECORD_TYPE);
|
||
tree gnu_unpad_base_name = TYPE_NAME (gnu_unpad_base_type);
|
||
tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type);
|
||
|
||
if (TREE_CODE (gnu_unpad_base_name) == TYPE_DECL)
|
||
gnu_unpad_base_name = DECL_NAME (gnu_unpad_base_name);
|
||
|
||
TYPE_NAME (gnu_subtype_marker)
|
||
= create_concat_name (gnat_entity, "XVS");
|
||
finish_record_type (gnu_subtype_marker,
|
||
create_field_decl (gnu_unpad_base_name,
|
||
build_reference_type
|
||
(gnu_unpad_base_type),
|
||
gnu_subtype_marker,
|
||
NULL_TREE, NULL_TREE,
|
||
0, 0),
|
||
0, true);
|
||
|
||
add_parallel_type (TYPE_STUB_DECL (gnu_type),
|
||
gnu_subtype_marker);
|
||
|
||
if (definition
|
||
&& TREE_CODE (gnu_size_unit) != INTEGER_CST
|
||
&& !CONTAINS_PLACEHOLDER_P (gnu_size_unit))
|
||
TYPE_SIZE_UNIT (gnu_subtype_marker)
|
||
= create_var_decl (create_concat_name (gnat_entity,
|
||
"XVZ"),
|
||
NULL_TREE, sizetype, gnu_size_unit,
|
||
false, false, false, false, NULL,
|
||
gnat_entity);
|
||
}
|
||
|
||
/* Now we can finalize it. */
|
||
rest_of_record_type_compilation (gnu_type);
|
||
}
|
||
|
||
/* Otherwise, go down all the components in the new type and make
|
||
them equivalent to those in the base type. */
|
||
else
|
||
{
|
||
gnu_type = gnu_base_type;
|
||
|
||
for (gnat_temp = First_Entity (gnat_entity);
|
||
Present (gnat_temp);
|
||
gnat_temp = Next_Entity (gnat_temp))
|
||
if ((Ekind (gnat_temp) == E_Discriminant
|
||
&& !Is_Unchecked_Union (gnat_base_type))
|
||
|| Ekind (gnat_temp) == E_Component)
|
||
save_gnu_tree (gnat_temp,
|
||
gnat_to_gnu_field_decl
|
||
(Original_Record_Component (gnat_temp)),
|
||
false);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case E_Access_Subprogram_Type:
|
||
/* Use the special descriptor type for dispatch tables if needed,
|
||
that is to say for the Prim_Ptr of a-tags.ads and its clones.
|
||
Note that we are only required to do so for static tables in
|
||
order to be compatible with the C++ ABI, but Ada 2005 allows
|
||
to extend library level tagged types at the local level so
|
||
we do it in the non-static case as well. */
|
||
if (TARGET_VTABLE_USES_DESCRIPTORS
|
||
&& Is_Dispatch_Table_Entity (gnat_entity))
|
||
{
|
||
gnu_type = fdesc_type_node;
|
||
gnu_size = TYPE_SIZE (gnu_type);
|
||
break;
|
||
}
|
||
|
||
/* ... fall through ... */
|
||
|
||
case E_Anonymous_Access_Subprogram_Type:
|
||
/* If we are not defining this entity, and we have incomplete
|
||
entities being processed above us, make a dummy type and
|
||
fill it in later. */
|
||
if (!definition && defer_incomplete_level != 0)
|
||
{
|
||
struct incomplete *p
|
||
= (struct incomplete *) xmalloc (sizeof (struct incomplete));
|
||
|
||
gnu_type
|
||
= build_pointer_type
|
||
(make_dummy_type (Directly_Designated_Type (gnat_entity)));
|
||
gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
|
||
!Comes_From_Source (gnat_entity),
|
||
debug_info_p, gnat_entity);
|
||
this_made_decl = true;
|
||
gnu_type = TREE_TYPE (gnu_decl);
|
||
save_gnu_tree (gnat_entity, gnu_decl, false);
|
||
saved = true;
|
||
|
||
p->old_type = TREE_TYPE (gnu_type);
|
||
p->full_type = Directly_Designated_Type (gnat_entity);
|
||
p->next = defer_incomplete_list;
|
||
defer_incomplete_list = p;
|
||
break;
|
||
}
|
||
|
||
/* ... fall through ... */
|
||
|
||
case E_Allocator_Type:
|
||
case E_Access_Type:
|
||
case E_Access_Attribute_Type:
|
||
case E_Anonymous_Access_Type:
|
||
case E_General_Access_Type:
|
||
{
|
||
Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
|
||
Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
|
||
bool is_from_limited_with
|
||
= (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
|
||
&& From_With_Type (gnat_desig_equiv));
|
||
|
||
/* Get the "full view" of this entity. If this is an incomplete
|
||
entity from a limited with, treat its non-limited view as the full
|
||
view. Otherwise, if this is an incomplete or private type, use the
|
||
full view. In the former case, we might point to a private type,
|
||
in which case, we need its full view. Also, we want to look at the
|
||
actual type used for the representation, so this takes a total of
|
||
three steps. */
|
||
Entity_Id gnat_desig_full_direct_first
|
||
= (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
|
||
: (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
|
||
? Full_View (gnat_desig_equiv) : Empty));
|
||
Entity_Id gnat_desig_full_direct
|
||
= ((is_from_limited_with
|
||
&& Present (gnat_desig_full_direct_first)
|
||
&& IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
|
||
? Full_View (gnat_desig_full_direct_first)
|
||
: gnat_desig_full_direct_first);
|
||
Entity_Id gnat_desig_full
|
||
= Gigi_Equivalent_Type (gnat_desig_full_direct);
|
||
|
||
/* This the type actually used to represent the designated type,
|
||
either gnat_desig_full or gnat_desig_equiv. */
|
||
Entity_Id gnat_desig_rep;
|
||
|
||
/* True if this is a pointer to an unconstrained array. */
|
||
bool is_unconstrained_array;
|
||
|
||
/* We want to know if we'll be seeing the freeze node for any
|
||
incomplete type we may be pointing to. */
|
||
bool in_main_unit
|
||
= (Present (gnat_desig_full)
|
||
? In_Extended_Main_Code_Unit (gnat_desig_full)
|
||
: In_Extended_Main_Code_Unit (gnat_desig_type));
|
||
|
||
/* True if we make a dummy type here. */
|
||
bool got_fat_p = false;
|
||
/* True if the dummy is a fat pointer. */
|
||
bool made_dummy = false;
|
||
tree gnu_desig_type = NULL_TREE;
|
||
enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
|
||
|
||
if (!targetm.valid_pointer_mode (p_mode))
|
||
p_mode = ptr_mode;
|
||
|
||
/* If either the designated type or its full view is an unconstrained
|
||
array subtype, replace it with the type it's a subtype of. This
|
||
avoids problems with multiple copies of unconstrained array types.
|
||
Likewise, if the designated type is a subtype of an incomplete
|
||
record type, use the parent type to avoid order of elaboration
|
||
issues. This can lose some code efficiency, but there is no
|
||
alternative. */
|
||
if (Ekind (gnat_desig_equiv) == E_Array_Subtype
|
||
&& ! Is_Constrained (gnat_desig_equiv))
|
||
gnat_desig_equiv = Etype (gnat_desig_equiv);
|
||
if (Present (gnat_desig_full)
|
||
&& ((Ekind (gnat_desig_full) == E_Array_Subtype
|
||
&& ! Is_Constrained (gnat_desig_full))
|
||
|| (Ekind (gnat_desig_full) == E_Record_Subtype
|
||
&& Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
|
||
gnat_desig_full = Etype (gnat_desig_full);
|
||
|
||
/* Now set the type that actually marks the representation of
|
||
the designated type and also flag whether we have a unconstrained
|
||
array. */
|
||
gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
|
||
is_unconstrained_array
|
||
= (Is_Array_Type (gnat_desig_rep)
|
||
&& ! Is_Constrained (gnat_desig_rep));
|
||
|
||
/* If we are pointing to an incomplete type whose completion is an
|
||
unconstrained array, make a fat pointer type. The two types in our
|
||
fields will be pointers to dummy nodes and will be replaced in
|
||
update_pointer_to. Similarly, if the type itself is a dummy type or
|
||
an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
|
||
in case we have any thin pointers to it. */
|
||
if (is_unconstrained_array
|
||
&& (Present (gnat_desig_full)
|
||
|| (present_gnu_tree (gnat_desig_equiv)
|
||
&& TYPE_IS_DUMMY_P (TREE_TYPE
|
||
(get_gnu_tree (gnat_desig_equiv))))
|
||
|| (No (gnat_desig_full) && ! in_main_unit
|
||
&& defer_incomplete_level != 0
|
||
&& ! present_gnu_tree (gnat_desig_equiv))
|
||
|| (in_main_unit && is_from_limited_with
|
||
&& Present (Freeze_Node (gnat_desig_rep)))))
|
||
{
|
||
tree gnu_old;
|
||
|
||
if (present_gnu_tree (gnat_desig_rep))
|
||
gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
|
||
else
|
||
{
|
||
gnu_old = make_dummy_type (gnat_desig_rep);
|
||
|
||
/* Show the dummy we get will be a fat pointer. */
|
||
got_fat_p = made_dummy = true;
|
||
}
|
||
|
||
/* If the call above got something that has a pointer, that
|
||
pointer is our type. This could have happened either
|
||
because the type was elaborated or because somebody
|
||
else executed the code below. */
|
||
gnu_type = TYPE_POINTER_TO (gnu_old);
|
||
if (!gnu_type)
|
||
{
|
||
tree gnu_template_type = make_node (ENUMERAL_TYPE);
|
||
tree gnu_ptr_template = build_pointer_type (gnu_template_type);
|
||
tree gnu_array_type = make_node (ENUMERAL_TYPE);
|
||
tree gnu_ptr_array = build_pointer_type (gnu_array_type);
|
||
tree fields;
|
||
|
||
TYPE_NAME (gnu_template_type)
|
||
= create_concat_name (gnat_desig_equiv, "XUB");
|
||
TYPE_DUMMY_P (gnu_template_type) = 1;
|
||
|
||
TYPE_NAME (gnu_array_type)
|
||
= create_concat_name (gnat_desig_equiv, "XUA");
|
||
TYPE_DUMMY_P (gnu_array_type) = 1;
|
||
|
||
gnu_type = make_node (RECORD_TYPE);
|
||
SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
|
||
TYPE_POINTER_TO (gnu_old) = gnu_type;
|
||
|
||
fields
|
||
= chainon (chainon (NULL_TREE,
|
||
create_field_decl
|
||
(get_identifier ("P_ARRAY"),
|
||
gnu_ptr_array, gnu_type,
|
||
NULL_TREE, NULL_TREE, 0, 0)),
|
||
create_field_decl (get_identifier ("P_BOUNDS"),
|
||
gnu_ptr_template, gnu_type,
|
||
NULL_TREE, NULL_TREE, 0, 0));
|
||
|
||
/* Make sure we can place this into a register. */
|
||
TYPE_ALIGN (gnu_type)
|
||
= MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
|
||
TYPE_FAT_POINTER_P (gnu_type) = 1;
|
||
|
||
/* Do not emit debug info for this record type since the types
|
||
of its fields are incomplete. */
|
||
finish_record_type (gnu_type, fields, 0, false);
|
||
|
||
TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
|
||
TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
|
||
= create_concat_name (gnat_desig_equiv, "XUT");
|
||
TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
|
||
}
|
||
}
|
||
|
||
/* If we already know what the full type is, use it. */
|
||
else if (Present (gnat_desig_full)
|
||
&& present_gnu_tree (gnat_desig_full))
|
||
gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
|
||
|
||
/* Get the type of the thing we are to point to and build a pointer
|
||
to it. If it is a reference to an incomplete or private type with a
|
||
full view that is a record, make a dummy type node and get the
|
||
actual type later when we have verified it is safe. */
|
||
else if ((! in_main_unit
|
||
&& ! present_gnu_tree (gnat_desig_equiv)
|
||
&& Present (gnat_desig_full)
|
||
&& ! present_gnu_tree (gnat_desig_full)
|
||
&& Is_Record_Type (gnat_desig_full))
|
||
/* Likewise if we are pointing to a record or array and we
|
||
are to defer elaborating incomplete types. We do this
|
||
since this access type may be the full view of some
|
||
private type. Note that the unconstrained array case is
|
||
handled above. */
|
||
|| ((! in_main_unit || imported_p)
|
||
&& defer_incomplete_level != 0
|
||
&& ! present_gnu_tree (gnat_desig_equiv)
|
||
&& ((Is_Record_Type (gnat_desig_rep)
|
||
|| Is_Array_Type (gnat_desig_rep))))
|
||
/* If this is a reference from a limited_with type back to our
|
||
main unit and there's a Freeze_Node for it, either we have
|
||
already processed the declaration and made the dummy type,
|
||
in which case we just reuse the latter, or we have not yet,
|
||
in which case we make the dummy type and it will be reused
|
||
when the declaration is processed. In both cases, the
|
||
pointer eventually created below will be automatically
|
||
adjusted when the Freeze_Node is processed. Note that the
|
||
unconstrained array case is handled above. */
|
||
|| (in_main_unit && is_from_limited_with
|
||
&& Present (Freeze_Node (gnat_desig_rep))))
|
||
{
|
||
gnu_desig_type = make_dummy_type (gnat_desig_equiv);
|
||
made_dummy = true;
|
||
}
|
||
|
||
/* Otherwise handle the case of a pointer to itself. */
|
||
else if (gnat_desig_equiv == gnat_entity)
|
||
{
|
||
gnu_type
|
||
= build_pointer_type_for_mode (void_type_node, p_mode,
|
||
No_Strict_Aliasing (gnat_entity));
|
||
TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
|
||
}
|
||
|
||
/* If expansion is disabled, the equivalent type of a concurrent
|
||
type is absent, so build a dummy pointer type. */
|
||
else if (type_annotate_only && No (gnat_desig_equiv))
|
||
gnu_type = ptr_void_type_node;
|
||
|
||
/* Finally, handle the straightforward case where we can just
|
||
elaborate our designated type and point to it. */
|
||
else
|
||
gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
|
||
|
||
/* It is possible that a call to gnat_to_gnu_type above resolved our
|
||
type. If so, just return it. */
|
||
if (present_gnu_tree (gnat_entity))
|
||
{
|
||
maybe_present = true;
|
||
break;
|
||
}
|
||
|
||
/* If we have a GCC type for the designated type, possibly modify it
|
||
if we are pointing only to constant objects and then make a pointer
|
||
to it. Don't do this for unconstrained arrays. */
|
||
if (!gnu_type && gnu_desig_type)
|
||
{
|
||
if (Is_Access_Constant (gnat_entity)
|
||
&& TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
|
||
{
|
||
gnu_desig_type
|
||
= build_qualified_type
|
||
(gnu_desig_type,
|
||
TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
|
||
|
||
/* Some extra processing is required if we are building a
|
||
pointer to an incomplete type (in the GCC sense). We might
|
||
have such a type if we just made a dummy, or directly out
|
||
of the call to gnat_to_gnu_type above if we are processing
|
||
an access type for a record component designating the
|
||
record type itself. */
|
||
if (TYPE_MODE (gnu_desig_type) == VOIDmode)
|
||
{
|
||
/* We must ensure that the pointer to variant we make will
|
||
be processed by update_pointer_to when the initial type
|
||
is completed. Pretend we made a dummy and let further
|
||
processing act as usual. */
|
||
made_dummy = true;
|
||
|
||
/* We must ensure that update_pointer_to will not retrieve
|
||
the dummy variant when building a properly qualified
|
||
version of the complete type. We take advantage of the
|
||
fact that get_qualified_type is requiring TYPE_NAMEs to
|
||
match to influence build_qualified_type and then also
|
||
update_pointer_to here. */
|
||
TYPE_NAME (gnu_desig_type)
|
||
= create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
|
||
}
|
||
}
|
||
|
||
gnu_type
|
||
= build_pointer_type_for_mode (gnu_desig_type, p_mode,
|
||
No_Strict_Aliasing (gnat_entity));
|
||
}
|
||
|
||
/* If we are not defining this object and we made a dummy pointer,
|
||
save our current definition, evaluate the actual type, and replace
|
||
the tentative type we made with the actual one. If we are to defer
|
||
actually looking up the actual type, make an entry in the
|
||
deferred list. If this is from a limited with, we have to defer
|
||
to the end of the current spec in two cases: first if the
|
||
designated type is in the current unit and second if the access
|
||
type is. */
|
||
if ((! in_main_unit || is_from_limited_with) && made_dummy)
|
||
{
|
||
tree gnu_old_type
|
||
= TYPE_IS_FAT_POINTER_P (gnu_type)
|
||
? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
|
||
|
||
if (esize == POINTER_SIZE
|
||
&& (got_fat_p || TYPE_IS_FAT_POINTER_P (gnu_type)))
|
||
gnu_type
|
||
= build_pointer_type
|
||
(TYPE_OBJECT_RECORD_TYPE
|
||
(TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
|
||
|
||
gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
|
||
!Comes_From_Source (gnat_entity),
|
||
debug_info_p, gnat_entity);
|
||
this_made_decl = true;
|
||
gnu_type = TREE_TYPE (gnu_decl);
|
||
save_gnu_tree (gnat_entity, gnu_decl, false);
|
||
saved = true;
|
||
|
||
if (defer_incomplete_level == 0
|
||
&& ! (is_from_limited_with
|
||
&& (in_main_unit
|
||
|| In_Extended_Main_Code_Unit (gnat_entity))))
|
||
update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
|
||
gnat_to_gnu_type (gnat_desig_equiv));
|
||
|
||
/* Note that the call to gnat_to_gnu_type here might have
|
||
updated gnu_old_type directly, in which case it is not a
|
||
dummy type any more when we get into update_pointer_to.
|
||
|
||
This may happen for instance when the designated type is a
|
||
record type, because their elaboration starts with an
|
||
initial node from make_dummy_type, which may yield the same
|
||
node as the one we got.
|
||
|
||
Besides, variants of this non-dummy type might have been
|
||
created along the way. update_pointer_to is expected to
|
||
properly take care of those situations. */
|
||
else
|
||
{
|
||
struct incomplete *p
|
||
= (struct incomplete *) xmalloc (sizeof
|
||
(struct incomplete));
|
||
struct incomplete **head
|
||
= (is_from_limited_with
|
||
&& (in_main_unit
|
||
|| In_Extended_Main_Code_Unit (gnat_entity))
|
||
? &defer_limited_with : &defer_incomplete_list);
|
||
|
||
p->old_type = gnu_old_type;
|
||
p->full_type = gnat_desig_equiv;
|
||
p->next = *head;
|
||
*head = p;
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
|
||
case E_Access_Protected_Subprogram_Type:
|
||
case E_Anonymous_Access_Protected_Subprogram_Type:
|
||
if (type_annotate_only && No (gnat_equiv_type))
|
||
gnu_type = ptr_void_type_node;
|
||
else
|
||
{
|
||
/* The runtime representation is the equivalent type. */
|
||
gnu_type = gnat_to_gnu_type (gnat_equiv_type);
|
||
maybe_present = true;
|
||
}
|
||
|
||
if (Is_Itype (Directly_Designated_Type (gnat_entity))
|
||
&& !present_gnu_tree (Directly_Designated_Type (gnat_entity))
|
||
&& No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
|
||
&& !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
|
||
gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
|
||
NULL_TREE, 0);
|
||
|
||
break;
|
||
|
||
case E_Access_Subtype:
|
||
|
||
/* We treat this as identical to its base type; any constraint is
|
||
meaningful only to the front end.
|
||
|
||
The designated type must be elaborated as well, if it does
|
||
not have its own freeze node. Designated (sub)types created
|
||
for constrained components of records with discriminants are
|
||
not frozen by the front end and thus not elaborated by gigi,
|
||
because their use may appear before the base type is frozen,
|
||
and because it is not clear that they are needed anywhere in
|
||
Gigi. With the current model, there is no correct place where
|
||
they could be elaborated. */
|
||
|
||
gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
|
||
if (Is_Itype (Directly_Designated_Type (gnat_entity))
|
||
&& !present_gnu_tree (Directly_Designated_Type (gnat_entity))
|
||
&& Is_Frozen (Directly_Designated_Type (gnat_entity))
|
||
&& No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
|
||
{
|
||
/* If we are not defining this entity, and we have incomplete
|
||
entities being processed above us, make a dummy type and
|
||
elaborate it later. */
|
||
if (!definition && defer_incomplete_level != 0)
|
||
{
|
||
struct incomplete *p
|
||
= (struct incomplete *) xmalloc (sizeof (struct incomplete));
|
||
tree gnu_ptr_type
|
||
= build_pointer_type
|
||
(make_dummy_type (Directly_Designated_Type (gnat_entity)));
|
||
|
||
p->old_type = TREE_TYPE (gnu_ptr_type);
|
||
p->full_type = Directly_Designated_Type (gnat_entity);
|
||
p->next = defer_incomplete_list;
|
||
defer_incomplete_list = p;
|
||
}
|
||
else if (!IN (Ekind (Base_Type
|
||
(Directly_Designated_Type (gnat_entity))),
|
||
Incomplete_Or_Private_Kind))
|
||
gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
|
||
NULL_TREE, 0);
|
||
}
|
||
|
||
maybe_present = true;
|
||
break;
|
||
|
||
/* Subprogram Entities
|
||
|
||
The following access functions are defined for subprograms (functions
|
||
or procedures):
|
||
|
||
First_Formal The first formal parameter.
|
||
Is_Imported Indicates that the subprogram has appeared in
|
||
an INTERFACE or IMPORT pragma. For now we
|
||
assume that the external language is C.
|
||
Is_Exported Likewise but for an EXPORT pragma.
|
||
Is_Inlined True if the subprogram is to be inlined.
|
||
|
||
In addition for function subprograms we have:
|
||
|
||
Etype Return type of the function.
|
||
|
||
Each parameter is first checked by calling must_pass_by_ref on its
|
||
type to determine if it is passed by reference. For parameters which
|
||
are copied in, if they are Ada In Out or Out parameters, their return
|
||
value becomes part of a record which becomes the return type of the
|
||
function (C function - note that this applies only to Ada procedures
|
||
so there is no Ada return type). Additional code to store back the
|
||
parameters will be generated on the caller side. This transformation
|
||
is done here, not in the front-end.
|
||
|
||
The intended result of the transformation can be seen from the
|
||
equivalent source rewritings that follow:
|
||
|
||
struct temp {int a,b};
|
||
procedure P (A,B: In Out ...) is temp P (int A,B)
|
||
begin {
|
||
.. ..
|
||
end P; return {A,B};
|
||
}
|
||
|
||
temp t;
|
||
P(X,Y); t = P(X,Y);
|
||
X = t.a , Y = t.b;
|
||
|
||
For subprogram types we need to perform mainly the same conversions to
|
||
GCC form that are needed for procedures and function declarations. The
|
||
only difference is that at the end, we make a type declaration instead
|
||
of a function declaration. */
|
||
|
||
case E_Subprogram_Type:
|
||
case E_Function:
|
||
case E_Procedure:
|
||
{
|
||
/* The first GCC parameter declaration (a PARM_DECL node). The
|
||
PARM_DECL nodes are chained through the TREE_CHAIN field, so this
|
||
actually is the head of this parameter list. */
|
||
tree gnu_param_list = NULL_TREE;
|
||
/* Likewise for the stub associated with an exported procedure. */
|
||
tree gnu_stub_param_list = NULL_TREE;
|
||
/* The type returned by a function. If the subprogram is a procedure
|
||
this type should be void_type_node. */
|
||
tree gnu_return_type = void_type_node;
|
||
/* List of fields in return type of procedure with copy-in copy-out
|
||
parameters. */
|
||
tree gnu_field_list = NULL_TREE;
|
||
/* Non-null for subprograms containing parameters passed by copy-in
|
||
copy-out (Ada In Out or Out parameters not passed by reference),
|
||
in which case it is the list of nodes used to specify the values
|
||
of the In Out/Out parameters that are returned as a record upon
|
||
procedure return. The TREE_PURPOSE of an element of this list is
|
||
a field of the record and the TREE_VALUE is the PARM_DECL
|
||
corresponding to that field. This list will be saved in the
|
||
TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
|
||
tree gnu_cico_list = NULL_TREE;
|
||
/* If an import pragma asks to map this subprogram to a GCC builtin,
|
||
this is the builtin DECL node. */
|
||
tree gnu_builtin_decl = NULL_TREE;
|
||
/* For the stub associated with an exported procedure. */
|
||
tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
|
||
tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
|
||
Entity_Id gnat_param;
|
||
bool inline_flag = Is_Inlined (gnat_entity);
|
||
bool public_flag = Is_Public (gnat_entity) || imported_p;
|
||
bool extern_flag
|
||
= (Is_Public (gnat_entity) && !definition) || imported_p;
|
||
|
||
/* The semantics of "pure" in Ada essentially matches that of "const"
|
||
in the back-end. In particular, both properties are orthogonal to
|
||
the "nothrow" property if the EH circuitry is explicit in the
|
||
internal representation of the back-end. If we are to completely
|
||
hide the EH circuitry from it, we need to declare that calls to pure
|
||
Ada subprograms that can throw have side effects since they can
|
||
trigger an "abnormal" transfer of control flow; thus they can be
|
||
neither "const" nor "pure" in the back-end sense. */
|
||
bool const_flag
|
||
= (Exception_Mechanism == Back_End_Exceptions
|
||
&& Is_Pure (gnat_entity));
|
||
|
||
bool volatile_flag = No_Return (gnat_entity);
|
||
bool return_by_direct_ref_p = false;
|
||
bool return_by_invisi_ref_p = false;
|
||
bool return_unconstrained_p = false;
|
||
bool has_copy_in_out = false;
|
||
bool has_stub = false;
|
||
int parmnum;
|
||
|
||
/* A parameter may refer to this type, so defer completion of any
|
||
incomplete types. */
|
||
if (kind == E_Subprogram_Type && !definition)
|
||
{
|
||
defer_incomplete_level++;
|
||
this_deferred = true;
|
||
}
|
||
|
||
/* If the subprogram has an alias, it is probably inherited, so
|
||
we can use the original one. If the original "subprogram"
|
||
is actually an enumeration literal, it may be the first use
|
||
of its type, so we must elaborate that type now. */
|
||
if (Present (Alias (gnat_entity)))
|
||
{
|
||
if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
|
||
gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
|
||
|
||
gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
|
||
gnu_expr, 0);
|
||
|
||
/* Elaborate any Itypes in the parameters of this entity. */
|
||
for (gnat_temp = First_Formal_With_Extras (gnat_entity);
|
||
Present (gnat_temp);
|
||
gnat_temp = Next_Formal_With_Extras (gnat_temp))
|
||
if (Is_Itype (Etype (gnat_temp)))
|
||
gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
|
||
|
||
break;
|
||
}
|
||
|
||
/* If this subprogram is expectedly bound to a GCC builtin, fetch the
|
||
corresponding DECL node.
|
||
|
||
We still want the parameter associations to take place because the
|
||
proper generation of calls depends on it (a GNAT parameter without
|
||
a corresponding GCC tree has a very specific meaning), so we don't
|
||
just break here. */
|
||
if (Convention (gnat_entity) == Convention_Intrinsic)
|
||
gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
|
||
|
||
/* ??? What if we don't find the builtin node above ? warn ? err ?
|
||
In the current state we neither warn nor err, and calls will just
|
||
be handled as for regular subprograms. */
|
||
|
||
if (kind == E_Function || kind == E_Subprogram_Type)
|
||
gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
|
||
|
||
/* If this function returns by reference, make the actual return
|
||
type of this function the pointer and mark the decl. */
|
||
if (Returns_By_Ref (gnat_entity))
|
||
{
|
||
gnu_return_type = build_pointer_type (gnu_return_type);
|
||
return_by_direct_ref_p = true;
|
||
}
|
||
|
||
/* If the Mechanism is By_Reference, ensure this function uses the
|
||
target's by-invisible-reference mechanism, which may not be the
|
||
same as above (e.g. it might be passing an extra parameter).
|
||
|
||
Prior to GCC 4, this was handled by just setting TREE_ADDRESSABLE
|
||
on the result type. Everything required to pass by invisible
|
||
reference using the target's mechanism (e.g. an extra parameter)
|
||
was handled at RTL expansion time.
|
||
|
||
This doesn't work with GCC 4 any more for several reasons. First,
|
||
the gimplification process might need to create temporaries of this
|
||
type and the gimplifier ICEs on such attempts; that's why the flag
|
||
is now set on the function type instead. Second, the middle-end
|
||
now also relies on a different attribute, DECL_BY_REFERENCE on the
|
||
RESULT_DECL, and expects the by-invisible-reference-ness to be made
|
||
explicit in the function body. */
|
||
else if (kind == E_Function && Mechanism (gnat_entity) == By_Reference)
|
||
return_by_invisi_ref_p = true;
|
||
|
||
/* If we are supposed to return an unconstrained array, actually return
|
||
a fat pointer and make a note of that. */
|
||
else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
|
||
{
|
||
gnu_return_type = TREE_TYPE (gnu_return_type);
|
||
return_unconstrained_p = true;
|
||
}
|
||
|
||
/* If the type requires a transient scope, the result is allocated
|
||
on the secondary stack, so the result type of the function is
|
||
just a pointer. */
|
||
else if (Requires_Transient_Scope (Etype (gnat_entity)))
|
||
{
|
||
gnu_return_type = build_pointer_type (gnu_return_type);
|
||
return_unconstrained_p = true;
|
||
}
|
||
|
||
/* If the type is a padded type and the underlying type would not
|
||
be passed by reference or this function has a foreign convention,
|
||
return the underlying type. */
|
||
else if (TYPE_IS_PADDING_P (gnu_return_type)
|
||
&& (!default_pass_by_ref (TREE_TYPE
|
||
(TYPE_FIELDS (gnu_return_type)))
|
||
|| Has_Foreign_Convention (gnat_entity)))
|
||
gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
|
||
|
||
/* If the return type is unconstrained, that means it must have a
|
||
maximum size. Use the padded type as the effective return type.
|
||
And ensure the function uses the target's by-invisible-reference
|
||
mechanism to avoid copying too much data when it returns. */
|
||
if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type)))
|
||
{
|
||
gnu_return_type
|
||
= maybe_pad_type (gnu_return_type,
|
||
max_size (TYPE_SIZE (gnu_return_type), true),
|
||
0, gnat_entity, false, false, false, true);
|
||
return_by_invisi_ref_p = true;
|
||
}
|
||
|
||
/* If the return type has a size that overflows, we cannot have
|
||
a function that returns that type. This usage doesn't make
|
||
sense anyway, so give an error here. */
|
||
if (TYPE_SIZE_UNIT (gnu_return_type)
|
||
&& TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
|
||
&& TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
|
||
{
|
||
post_error ("cannot return type whose size overflows",
|
||
gnat_entity);
|
||
gnu_return_type = copy_node (gnu_return_type);
|
||
TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
|
||
TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
|
||
TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
|
||
TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
|
||
}
|
||
|
||
/* Look at all our parameters and get the type of
|
||
each. While doing this, build a copy-out structure if
|
||
we need one. */
|
||
|
||
/* Loop over the parameters and get their associated GCC tree.
|
||
While doing this, build a copy-out structure if we need one. */
|
||
for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
|
||
Present (gnat_param);
|
||
gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
|
||
{
|
||
tree gnu_param_name = get_entity_name (gnat_param);
|
||
tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
|
||
tree gnu_param, gnu_field;
|
||
bool copy_in_copy_out = false;
|
||
Mechanism_Type mech = Mechanism (gnat_param);
|
||
|
||
/* Builtins are expanded inline and there is no real call sequence
|
||
involved. So the type expected by the underlying expander is
|
||
always the type of each argument "as is". */
|
||
if (gnu_builtin_decl)
|
||
mech = By_Copy;
|
||
/* Handle the first parameter of a valued procedure specially. */
|
||
else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
|
||
mech = By_Copy_Return;
|
||
/* Otherwise, see if a Mechanism was supplied that forced this
|
||
parameter to be passed one way or another. */
|
||
else if (mech == Default
|
||
|| mech == By_Copy || mech == By_Reference)
|
||
;
|
||
else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
|
||
mech = By_Descriptor;
|
||
|
||
else if (By_Short_Descriptor_Last <= mech &&
|
||
mech <= By_Short_Descriptor)
|
||
mech = By_Short_Descriptor;
|
||
|
||
else if (mech > 0)
|
||
{
|
||
if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
|
||
|| TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
|
||
|| 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
|
||
mech))
|
||
mech = By_Reference;
|
||
else
|
||
mech = By_Copy;
|
||
}
|
||
else
|
||
{
|
||
post_error ("unsupported mechanism for&", gnat_param);
|
||
mech = Default;
|
||
}
|
||
|
||
gnu_param
|
||
= gnat_to_gnu_param (gnat_param, mech, gnat_entity,
|
||
Has_Foreign_Convention (gnat_entity),
|
||
©_in_copy_out);
|
||
|
||
/* We are returned either a PARM_DECL or a type if no parameter
|
||
needs to be passed; in either case, adjust the type. */
|
||
if (DECL_P (gnu_param))
|
||
gnu_param_type = TREE_TYPE (gnu_param);
|
||
else
|
||
{
|
||
gnu_param_type = gnu_param;
|
||
gnu_param = NULL_TREE;
|
||
}
|
||
|
||
if (gnu_param)
|
||
{
|
||
/* If it's an exported subprogram, we build a parameter list
|
||
in parallel, in case we need to emit a stub for it. */
|
||
if (Is_Exported (gnat_entity))
|
||
{
|
||
gnu_stub_param_list
|
||
= chainon (gnu_param, gnu_stub_param_list);
|
||
/* Change By_Descriptor parameter to By_Reference for
|
||
the internal version of an exported subprogram. */
|
||
if (mech == By_Descriptor || mech == By_Short_Descriptor)
|
||
{
|
||
gnu_param
|
||
= gnat_to_gnu_param (gnat_param, By_Reference,
|
||
gnat_entity, false,
|
||
©_in_copy_out);
|
||
has_stub = true;
|
||
}
|
||
else
|
||
gnu_param = copy_node (gnu_param);
|
||
}
|
||
|
||
gnu_param_list = chainon (gnu_param, gnu_param_list);
|
||
Sloc_to_locus (Sloc (gnat_param),
|
||
&DECL_SOURCE_LOCATION (gnu_param));
|
||
save_gnu_tree (gnat_param, gnu_param, false);
|
||
|
||
/* If a parameter is a pointer, this function may modify
|
||
memory through it and thus shouldn't be considered
|
||
a const function. Also, the memory may be modified
|
||
between two calls, so they can't be CSE'ed. The latter
|
||
case also handles by-ref parameters. */
|
||
if (POINTER_TYPE_P (gnu_param_type)
|
||
|| TYPE_IS_FAT_POINTER_P (gnu_param_type))
|
||
const_flag = false;
|
||
}
|
||
|
||
if (copy_in_copy_out)
|
||
{
|
||
if (!has_copy_in_out)
|
||
{
|
||
gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
|
||
gnu_return_type = make_node (RECORD_TYPE);
|
||
TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
|
||
/* Set a default alignment to speed up accesses. */
|
||
TYPE_ALIGN (gnu_return_type)
|
||
= get_mode_alignment (ptr_mode);
|
||
has_copy_in_out = true;
|
||
}
|
||
|
||
gnu_field
|
||
= create_field_decl (gnu_param_name, gnu_param_type,
|
||
gnu_return_type, NULL_TREE, NULL_TREE,
|
||
0, 0);
|
||
Sloc_to_locus (Sloc (gnat_param),
|
||
&DECL_SOURCE_LOCATION (gnu_field));
|
||
TREE_CHAIN (gnu_field) = gnu_field_list;
|
||
gnu_field_list = gnu_field;
|
||
gnu_cico_list
|
||
= tree_cons (gnu_field, gnu_param, gnu_cico_list);
|
||
}
|
||
}
|
||
|
||
/* Do not compute record for out parameters if subprogram is
|
||
stubbed since structures are incomplete for the back-end. */
|
||
if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
|
||
finish_record_type (gnu_return_type, nreverse (gnu_field_list),
|
||
0, debug_info_p);
|
||
|
||
/* If we have a CICO list but it has only one entry, we convert
|
||
this function into a function that simply returns that one
|
||
object. */
|
||
if (list_length (gnu_cico_list) == 1)
|
||
gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list));
|
||
|
||
if (Has_Stdcall_Convention (gnat_entity))
|
||
prepend_one_attribute_to
|
||
(&attr_list, ATTR_MACHINE_ATTRIBUTE,
|
||
get_identifier ("stdcall"), NULL_TREE,
|
||
gnat_entity);
|
||
|
||
/* If we are on a target where stack realignment is needed for 'main'
|
||
to honor GCC's implicit expectations (stack alignment greater than
|
||
what the base ABI guarantees), ensure we do the same for foreign
|
||
convention subprograms as they might be used as callbacks from code
|
||
breaking such expectations. Note that this applies to task entry
|
||
points in particular. */
|
||
if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
|
||
&& Has_Foreign_Convention (gnat_entity))
|
||
prepend_one_attribute_to
|
||
(&attr_list, ATTR_MACHINE_ATTRIBUTE,
|
||
get_identifier ("force_align_arg_pointer"), NULL_TREE,
|
||
gnat_entity);
|
||
|
||
/* The lists have been built in reverse. */
|
||
gnu_param_list = nreverse (gnu_param_list);
|
||
if (has_stub)
|
||
gnu_stub_param_list = nreverse (gnu_stub_param_list);
|
||
gnu_cico_list = nreverse (gnu_cico_list);
|
||
|
||
if (Ekind (gnat_entity) == E_Function)
|
||
Set_Mechanism (gnat_entity, return_unconstrained_p
|
||
|| return_by_direct_ref_p
|
||
|| return_by_invisi_ref_p
|
||
? By_Reference : By_Copy);
|
||
gnu_type
|
||
= create_subprog_type (gnu_return_type, gnu_param_list,
|
||
gnu_cico_list, return_unconstrained_p,
|
||
return_by_direct_ref_p,
|
||
return_by_invisi_ref_p);
|
||
|
||
if (has_stub)
|
||
gnu_stub_type
|
||
= create_subprog_type (gnu_return_type, gnu_stub_param_list,
|
||
gnu_cico_list, return_unconstrained_p,
|
||
return_by_direct_ref_p,
|
||
return_by_invisi_ref_p);
|
||
|
||
/* A subprogram (something that doesn't return anything) shouldn't
|
||
be considered const since there would be no reason for such a
|
||
subprogram. Note that procedures with Out (or In Out) parameters
|
||
have already been converted into a function with a return type. */
|
||
if (TREE_CODE (gnu_return_type) == VOID_TYPE)
|
||
const_flag = false;
|
||
|
||
gnu_type
|
||
= build_qualified_type (gnu_type,
|
||
TYPE_QUALS (gnu_type)
|
||
| (TYPE_QUAL_CONST * const_flag)
|
||
| (TYPE_QUAL_VOLATILE * volatile_flag));
|
||
|
||
if (has_stub)
|
||
gnu_stub_type
|
||
= build_qualified_type (gnu_stub_type,
|
||
TYPE_QUALS (gnu_stub_type)
|
||
| (TYPE_QUAL_CONST * const_flag)
|
||
| (TYPE_QUAL_VOLATILE * volatile_flag));
|
||
|
||
/* If we have a builtin decl for that function, check the signatures
|
||
compatibilities. If the signatures are compatible, use the builtin
|
||
decl. If they are not, we expect the checker predicate to have
|
||
posted the appropriate errors, and just continue with what we have
|
||
so far. */
|
||
if (gnu_builtin_decl)
|
||
{
|
||
tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
|
||
|
||
if (compatible_signatures_p (gnu_type, gnu_builtin_type))
|
||
{
|
||
gnu_decl = gnu_builtin_decl;
|
||
gnu_type = gnu_builtin_type;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* If there was no specified Interface_Name and the external and
|
||
internal names of the subprogram are the same, only use the
|
||
internal name to allow disambiguation of nested subprograms. */
|
||
if (No (Interface_Name (gnat_entity))
|
||
&& gnu_ext_name == gnu_entity_name)
|
||
gnu_ext_name = NULL_TREE;
|
||
|
||
/* If we are defining the subprogram and it has an Address clause
|
||
we must get the address expression from the saved GCC tree for the
|
||
subprogram if it has a Freeze_Node. Otherwise, we elaborate
|
||
the address expression here since the front-end has guaranteed
|
||
in that case that the elaboration has no effects. If there is
|
||
an Address clause and we are not defining the object, just
|
||
make it a constant. */
|
||
if (Present (Address_Clause (gnat_entity)))
|
||
{
|
||
tree gnu_address = NULL_TREE;
|
||
|
||
if (definition)
|
||
gnu_address
|
||
= (present_gnu_tree (gnat_entity)
|
||
? get_gnu_tree (gnat_entity)
|
||
: gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
|
||
|
||
save_gnu_tree (gnat_entity, NULL_TREE, false);
|
||
|
||
/* Convert the type of the object to a reference type that can
|
||
alias everything as per 13.3(19). */
|
||
gnu_type
|
||
= build_reference_type_for_mode (gnu_type, ptr_mode, true);
|
||
if (gnu_address)
|
||
gnu_address = convert (gnu_type, gnu_address);
|
||
|
||
gnu_decl
|
||
= create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
|
||
gnu_address, false, Is_Public (gnat_entity),
|
||
extern_flag, false, NULL, gnat_entity);
|
||
DECL_BY_REF_P (gnu_decl) = 1;
|
||
}
|
||
|
||
else if (kind == E_Subprogram_Type)
|
||
gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
|
||
!Comes_From_Source (gnat_entity),
|
||
debug_info_p, gnat_entity);
|
||
else
|
||
{
|
||
if (has_stub)
|
||
{
|
||
gnu_stub_name = gnu_ext_name;
|
||
gnu_ext_name = create_concat_name (gnat_entity, "internal");
|
||
public_flag = false;
|
||
}
|
||
|
||
gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
|
||
gnu_type, gnu_param_list,
|
||
inline_flag, public_flag,
|
||
extern_flag, attr_list,
|
||
gnat_entity);
|
||
if (has_stub)
|
||
{
|
||
tree gnu_stub_decl
|
||
= create_subprog_decl (gnu_entity_name, gnu_stub_name,
|
||
gnu_stub_type, gnu_stub_param_list,
|
||
inline_flag, true,
|
||
extern_flag, attr_list,
|
||
gnat_entity);
|
||
SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
|
||
}
|
||
|
||
/* This is unrelated to the stub built right above. */
|
||
DECL_STUBBED_P (gnu_decl)
|
||
= Convention (gnat_entity) == Convention_Stubbed;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case E_Incomplete_Type:
|
||
case E_Incomplete_Subtype:
|
||
case E_Private_Type:
|
||
case E_Private_Subtype:
|
||
case E_Limited_Private_Type:
|
||
case E_Limited_Private_Subtype:
|
||
case E_Record_Type_With_Private:
|
||
case E_Record_Subtype_With_Private:
|
||
{
|
||
/* Get the "full view" of this entity. If this is an incomplete
|
||
entity from a limited with, treat its non-limited view as the
|
||
full view. Otherwise, use either the full view or the underlying
|
||
full view, whichever is present. This is used in all the tests
|
||
below. */
|
||
Entity_Id full_view
|
||
= (IN (Ekind (gnat_entity), Incomplete_Kind)
|
||
&& From_With_Type (gnat_entity))
|
||
? Non_Limited_View (gnat_entity)
|
||
: Present (Full_View (gnat_entity))
|
||
? Full_View (gnat_entity)
|
||
: Underlying_Full_View (gnat_entity);
|
||
|
||
/* If this is an incomplete type with no full view, it must be a Taft
|
||
Amendment type, in which case we return a dummy type. Otherwise,
|
||
just get the type from its Etype. */
|
||
if (No (full_view))
|
||
{
|
||
if (kind == E_Incomplete_Type)
|
||
{
|
||
gnu_type = make_dummy_type (gnat_entity);
|
||
gnu_decl = TYPE_STUB_DECL (gnu_type);
|
||
}
|
||
else
|
||
{
|
||
gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
|
||
NULL_TREE, 0);
|
||
maybe_present = true;
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* If we already made a type for the full view, reuse it. */
|
||
else if (present_gnu_tree (full_view))
|
||
{
|
||
gnu_decl = get_gnu_tree (full_view);
|
||
break;
|
||
}
|
||
|
||
/* Otherwise, if we are not defining the type now, get the type
|
||
from the full view. But always get the type from the full view
|
||
for define on use types, since otherwise we won't see them! */
|
||
else if (!definition
|
||
|| (Is_Itype (full_view)
|
||
&& No (Freeze_Node (gnat_entity)))
|
||
|| (Is_Itype (gnat_entity)
|
||
&& No (Freeze_Node (full_view))))
|
||
{
|
||
gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
|
||
maybe_present = true;
|
||
break;
|
||
}
|
||
|
||
/* For incomplete types, make a dummy type entry which will be
|
||
replaced later. Save it as the full declaration's type so
|
||
we can do any needed updates when we see it. */
|
||
gnu_type = make_dummy_type (gnat_entity);
|
||
gnu_decl = TYPE_STUB_DECL (gnu_type);
|
||
save_gnu_tree (full_view, gnu_decl, 0);
|
||
break;
|
||
}
|
||
|
||
case E_Class_Wide_Type:
|
||
/* Class-wide types are always transformed into their root type. */
|
||
gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
|
||
maybe_present = true;
|
||
break;
|
||
|
||
case E_Task_Type:
|
||
case E_Task_Subtype:
|
||
case E_Protected_Type:
|
||
case E_Protected_Subtype:
|
||
if (type_annotate_only && No (gnat_equiv_type))
|
||
gnu_type = void_type_node;
|
||
else
|
||
gnu_type = gnat_to_gnu_type (gnat_equiv_type);
|
||
|
||
maybe_present = true;
|
||
break;
|
||
|
||
case E_Label:
|
||
gnu_decl = create_label_decl (gnu_entity_name);
|
||
break;
|
||
|
||
case E_Block:
|
||
case E_Loop:
|
||
/* Nothing at all to do here, so just return an ERROR_MARK and claim
|
||
we've already saved it, so we don't try to. */
|
||
gnu_decl = error_mark_node;
|
||
saved = true;
|
||
break;
|
||
|
||
default:
|
||
gcc_unreachable ();
|
||
}
|
||
|
||
/* If we had a case where we evaluated another type and it might have
|
||
defined this one, handle it here. */
|
||
if (maybe_present && present_gnu_tree (gnat_entity))
|
||
{
|
||
gnu_decl = get_gnu_tree (gnat_entity);
|
||
saved = true;
|
||
}
|
||
|
||
/* If we are processing a type and there is either no decl for it or
|
||
we just made one, do some common processing for the type, such as
|
||
handling alignment and possible padding. */
|
||
if (is_type && (!gnu_decl || this_made_decl))
|
||
{
|
||
/* Tell the middle-end that objects of tagged types are guaranteed to
|
||
be properly aligned. This is necessary because conversions to the
|
||
class-wide type are translated into conversions to the root type,
|
||
which can be less aligned than some of its derived types. */
|
||
if (Is_Tagged_Type (gnat_entity)
|
||
|| Is_Class_Wide_Equivalent_Type (gnat_entity))
|
||
TYPE_ALIGN_OK (gnu_type) = 1;
|
||
|
||
/* If the type is passed by reference, objects of this type must be
|
||
fully addressable and cannot be copied. */
|
||
if (Is_By_Reference_Type (gnat_entity))
|
||
TREE_ADDRESSABLE (gnu_type) = 1;
|
||
|
||
/* ??? Don't set the size for a String_Literal since it is either
|
||
confirming or we don't handle it properly (if the low bound is
|
||
non-constant). */
|
||
if (!gnu_size && kind != E_String_Literal_Subtype)
|
||
gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
|
||
TYPE_DECL, false,
|
||
Has_Size_Clause (gnat_entity));
|
||
|
||
/* If a size was specified, see if we can make a new type of that size
|
||
by rearranging the type, for example from a fat to a thin pointer. */
|
||
if (gnu_size)
|
||
{
|
||
gnu_type
|
||
= make_type_from_size (gnu_type, gnu_size,
|
||
Has_Biased_Representation (gnat_entity));
|
||
|
||
if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
|
||
&& operand_equal_p (rm_size (gnu_type), gnu_size, 0))
|
||
gnu_size = 0;
|
||
}
|
||
|
||
/* If the alignment hasn't already been processed and this is
|
||
not an unconstrained array, see if an alignment is specified.
|
||
If not, we pick a default alignment for atomic objects. */
|
||
if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
|
||
;
|
||
else if (Known_Alignment (gnat_entity))
|
||
{
|
||
align = validate_alignment (Alignment (gnat_entity), gnat_entity,
|
||
TYPE_ALIGN (gnu_type));
|
||
|
||
/* Warn on suspiciously large alignments. This should catch
|
||
errors about the (alignment,byte)/(size,bit) discrepancy. */
|
||
if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
|
||
{
|
||
tree size;
|
||
|
||
/* If a size was specified, take it into account. Otherwise
|
||
use the RM size for records as the type size has already
|
||
been adjusted to the alignment. */
|
||
if (gnu_size)
|
||
size = gnu_size;
|
||
else if ((TREE_CODE (gnu_type) == RECORD_TYPE
|
||
|| TREE_CODE (gnu_type) == UNION_TYPE
|
||
|| TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
|
||
&& !TYPE_FAT_POINTER_P (gnu_type))
|
||
size = rm_size (gnu_type);
|
||
else
|
||
size = TYPE_SIZE (gnu_type);
|
||
|
||
/* Consider an alignment as suspicious if the alignment/size
|
||
ratio is greater or equal to the byte/bit ratio. */
|
||
if (host_integerp (size, 1)
|
||
&& align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
|
||
post_error_ne ("?suspiciously large alignment specified for&",
|
||
Expression (Alignment_Clause (gnat_entity)),
|
||
gnat_entity);
|
||
}
|
||
}
|
||
else if (Is_Atomic (gnat_entity) && !gnu_size
|
||
&& host_integerp (TYPE_SIZE (gnu_type), 1)
|
||
&& integer_pow2p (TYPE_SIZE (gnu_type)))
|
||
align = MIN (BIGGEST_ALIGNMENT,
|
||
tree_low_cst (TYPE_SIZE (gnu_type), 1));
|
||
else if (Is_Atomic (gnat_entity) && gnu_size
|
||
&& host_integerp (gnu_size, 1)
|
||
&& integer_pow2p (gnu_size))
|
||
align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
|
||
|
||
/* See if we need to pad the type. If we did, and made a record,
|
||
the name of the new type may be changed. So get it back for
|
||
us when we make the new TYPE_DECL below. */
|
||
if (gnu_size || align > 0)
|
||
gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
|
||
false, !gnu_decl, definition, false);
|
||
|
||
if (TYPE_IS_PADDING_P (gnu_type))
|
||
{
|
||
gnu_entity_name = TYPE_NAME (gnu_type);
|
||
if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
|
||
gnu_entity_name = DECL_NAME (gnu_entity_name);
|
||
}
|
||
|
||
set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
|
||
|
||
/* If we are at global level, GCC will have applied variable_size to
|
||
the type, but that won't have done anything. So, if it's not
|
||
a constant or self-referential, call elaborate_expression_1 to
|
||
make a variable for the size rather than calculating it each time.
|
||
Handle both the RM size and the actual size. */
|
||
if (global_bindings_p ()
|
||
&& TYPE_SIZE (gnu_type)
|
||
&& !TREE_CONSTANT (TYPE_SIZE (gnu_type))
|
||
&& !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
|
||
{
|
||
tree size = TYPE_SIZE (gnu_type);
|
||
|
||
TYPE_SIZE (gnu_type)
|
||
= elaborate_expression_1 (size, gnat_entity,
|
||
get_identifier ("SIZE"),
|
||
definition, false);
|
||
|
||
/* ??? For now, store the size as a multiple of the alignment in
|
||
bytes so that we can see the alignment from the tree. */
|
||
TYPE_SIZE_UNIT (gnu_type)
|
||
= elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_type), gnat_entity,
|
||
get_identifier ("SIZE_A_UNIT"),
|
||
definition, false,
|
||
TYPE_ALIGN (gnu_type));
|
||
|
||
/* ??? gnu_type may come from an existing type so the MULT_EXPR node
|
||
may not be marked by the call to create_type_decl below. */
|
||
MARK_VISITED (TYPE_SIZE_UNIT (gnu_type));
|
||
|
||
if (TREE_CODE (gnu_type) == RECORD_TYPE)
|
||
{
|
||
tree variant_part = get_variant_part (gnu_type);
|
||
tree ada_size = TYPE_ADA_SIZE (gnu_type);
|
||
|
||
if (variant_part)
|
||
{
|
||
tree union_type = TREE_TYPE (variant_part);
|
||
tree offset = DECL_FIELD_OFFSET (variant_part);
|
||
|
||
/* If the position of the variant part is constant, subtract
|
||
it from the size of the type of the parent to get the new
|
||
size. This manual CSE reduces the data size. */
|
||
if (TREE_CODE (offset) == INTEGER_CST)
|
||
{
|
||
tree bitpos = DECL_FIELD_BIT_OFFSET (variant_part);
|
||
TYPE_SIZE (union_type)
|
||
= size_binop (MINUS_EXPR, TYPE_SIZE (gnu_type),
|
||
bit_from_pos (offset, bitpos));
|
||
TYPE_SIZE_UNIT (union_type)
|
||
= size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (gnu_type),
|
||
byte_from_pos (offset, bitpos));
|
||
}
|
||
else
|
||
{
|
||
TYPE_SIZE (union_type)
|
||
= elaborate_expression_1 (TYPE_SIZE (union_type),
|
||
gnat_entity,
|
||
get_identifier ("VSIZE"),
|
||
definition, false);
|
||
|
||
/* ??? For now, store the size as a multiple of the
|
||
alignment in bytes so that we can see the alignment
|
||
from the tree. */
|
||
TYPE_SIZE_UNIT (union_type)
|
||
= elaborate_expression_2 (TYPE_SIZE_UNIT (union_type),
|
||
gnat_entity,
|
||
get_identifier
|
||
("VSIZE_A_UNIT"),
|
||
definition, false,
|
||
TYPE_ALIGN (union_type));
|
||
|
||
/* ??? For now, store the offset as a multiple of the
|
||
alignment in bytes so that we can see the alignment
|
||
from the tree. */
|
||
DECL_FIELD_OFFSET (variant_part)
|
||
= elaborate_expression_2 (offset,
|
||
gnat_entity,
|
||
get_identifier ("VOFFSET"),
|
||
definition, false,
|
||
DECL_OFFSET_ALIGN
|
||
(variant_part));
|
||
}
|
||
|
||
DECL_SIZE (variant_part) = TYPE_SIZE (union_type);
|
||
DECL_SIZE_UNIT (variant_part) = TYPE_SIZE_UNIT (union_type);
|
||
}
|
||
|
||
if (operand_equal_p (ada_size, size, 0))
|
||
ada_size = TYPE_SIZE (gnu_type);
|
||
else
|
||
ada_size
|
||
= elaborate_expression_1 (ada_size, gnat_entity,
|
||
get_identifier ("RM_SIZE"),
|
||
definition, false);
|
||
SET_TYPE_ADA_SIZE (gnu_type, ada_size);
|
||
}
|
||
}
|
||
|
||
/* If this is a record type or subtype, call elaborate_expression_1 on
|
||
any field position. Do this for both global and local types.
|
||
Skip any fields that we haven't made trees for to avoid problems with
|
||
class wide types. */
|
||
if (IN (kind, Record_Kind))
|
||
for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
|
||
gnat_temp = Next_Entity (gnat_temp))
|
||
if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
|
||
{
|
||
tree gnu_field = get_gnu_tree (gnat_temp);
|
||
|
||
/* ??? For now, store the offset as a multiple of the alignment
|
||
in bytes so that we can see the alignment from the tree. */
|
||
if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
|
||
{
|
||
DECL_FIELD_OFFSET (gnu_field)
|
||
= elaborate_expression_2 (DECL_FIELD_OFFSET (gnu_field),
|
||
gnat_temp,
|
||
get_identifier ("OFFSET"),
|
||
definition, false,
|
||
DECL_OFFSET_ALIGN (gnu_field));
|
||
|
||
/* ??? The context of gnu_field is not necessarily gnu_type
|
||
so the MULT_EXPR node built above may not be marked by
|
||
the call to create_type_decl below. */
|
||
if (global_bindings_p ())
|
||
MARK_VISITED (DECL_FIELD_OFFSET (gnu_field));
|
||
}
|
||
}
|
||
|
||
if (Treat_As_Volatile (gnat_entity))
|
||
gnu_type
|
||
= build_qualified_type (gnu_type,
|
||
TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE);
|
||
|
||
if (Is_Atomic (gnat_entity))
|
||
check_ok_for_atomic (gnu_type, gnat_entity, false);
|
||
|
||
if (Present (Alignment_Clause (gnat_entity)))
|
||
TYPE_USER_ALIGN (gnu_type) = 1;
|
||
|
||
if (Universal_Aliasing (gnat_entity))
|
||
TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
|
||
|
||
if (!gnu_decl)
|
||
gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
|
||
!Comes_From_Source (gnat_entity),
|
||
debug_info_p, gnat_entity);
|
||
else
|
||
{
|
||
TREE_TYPE (gnu_decl) = gnu_type;
|
||
TYPE_STUB_DECL (gnu_type) = gnu_decl;
|
||
}
|
||
}
|
||
|
||
if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
|
||
{
|
||
gnu_type = TREE_TYPE (gnu_decl);
|
||
|
||
/* If this is a derived type, relate its alias set to that of its parent
|
||
to avoid troubles when a call to an inherited primitive is inlined in
|
||
a context where a derived object is accessed. The inlined code works
|
||
on the parent view so the resulting code may access the same object
|
||
using both the parent and the derived alias sets, which thus have to
|
||
conflict. As the same issue arises with component references, the
|
||
parent alias set also has to conflict with composite types enclosing
|
||
derived components. For instance, if we have:
|
||
|
||
type D is new T;
|
||
type R is record
|
||
Component : D;
|
||
end record;
|
||
|
||
we want T to conflict with both D and R, in addition to R being a
|
||
superset of D by record/component construction.
|
||
|
||
One way to achieve this is to perform an alias set copy from the
|
||
parent to the derived type. This is not quite appropriate, though,
|
||
as we don't want separate derived types to conflict with each other:
|
||
|
||
type I1 is new Integer;
|
||
type I2 is new Integer;
|
||
|
||
We want I1 and I2 to both conflict with Integer but we do not want
|
||
I1 to conflict with I2, and an alias set copy on derivation would
|
||
have that effect.
|
||
|
||
The option chosen is to make the alias set of the derived type a
|
||
superset of that of its parent type. It trivially fulfills the
|
||
simple requirement for the Integer derivation example above, and
|
||
the component case as well by superset transitivity:
|
||
|
||
superset superset
|
||
R ----------> D ----------> T
|
||
|
||
However, for composite types, conversions between derived types are
|
||
translated into VIEW_CONVERT_EXPRs so a sequence like:
|
||
|
||
type Comp1 is new Comp;
|
||
type Comp2 is new Comp;
|
||
procedure Proc (C : Comp1);
|
||
|
||
C : Comp2;
|
||
Proc (Comp1 (C));
|
||
|
||
is translated into:
|
||
|
||
C : Comp2;
|
||
Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C));
|
||
|
||
and gimplified into:
|
||
|
||
C : Comp2;
|
||
Comp1 *C.0;
|
||
C.0 = (Comp1 *) &C;
|
||
Proc (C.0);
|
||
|
||
i.e. generates code involving type punning. Therefore, Comp1 needs
|
||
to conflict with Comp2 and an alias set copy is required.
|
||
|
||
The language rules ensure the parent type is already frozen here. */
|
||
if (Is_Derived_Type (gnat_entity))
|
||
{
|
||
tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
|
||
relate_alias_sets (gnu_type, gnu_parent_type,
|
||
Is_Composite_Type (gnat_entity)
|
||
? ALIAS_SET_COPY : ALIAS_SET_SUPERSET);
|
||
}
|
||
|
||
/* Back-annotate the Alignment of the type if not already in the
|
||
tree. Likewise for sizes. */
|
||
if (Unknown_Alignment (gnat_entity))
|
||
{
|
||
unsigned int double_align, align;
|
||
bool is_capped_double, align_clause;
|
||
|
||
/* If the default alignment of "double" or larger scalar types is
|
||
specifically capped and this is not an array with an alignment
|
||
clause on the component type, return the cap. */
|
||
if ((double_align = double_float_alignment) > 0)
|
||
is_capped_double
|
||
= is_double_float_or_array (gnat_entity, &align_clause);
|
||
else if ((double_align = double_scalar_alignment) > 0)
|
||
is_capped_double
|
||
= is_double_scalar_or_array (gnat_entity, &align_clause);
|
||
else
|
||
is_capped_double = align_clause = false;
|
||
|
||
if (is_capped_double && !align_clause)
|
||
align = double_align;
|
||
else
|
||
align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT;
|
||
|
||
Set_Alignment (gnat_entity, UI_From_Int (align));
|
||
}
|
||
|
||
if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
|
||
{
|
||
tree gnu_size = TYPE_SIZE (gnu_type);
|
||
|
||
/* If the size is self-referential, annotate the maximum value. */
|
||
if (CONTAINS_PLACEHOLDER_P (gnu_size))
|
||
gnu_size = max_size (gnu_size, true);
|
||
|
||
if (type_annotate_only && Is_Tagged_Type (gnat_entity))
|
||
{
|
||
/* In this mode, the tag and the parent components are not
|
||
generated by the front-end so the sizes must be adjusted. */
|
||
tree pointer_size = bitsize_int (POINTER_SIZE), offset;
|
||
Uint uint_size;
|
||
|
||
if (Is_Derived_Type (gnat_entity))
|
||
{
|
||
offset = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
|
||
bitsizetype);
|
||
Set_Alignment (gnat_entity,
|
||
Alignment (Etype (Base_Type (gnat_entity))));
|
||
}
|
||
else
|
||
offset = pointer_size;
|
||
|
||
gnu_size = size_binop (PLUS_EXPR, gnu_size, offset);
|
||
gnu_size = size_binop (MULT_EXPR, pointer_size,
|
||
size_binop (CEIL_DIV_EXPR,
|
||
gnu_size,
|
||
pointer_size));
|
||
uint_size = annotate_value (gnu_size);
|
||
Set_Esize (gnat_entity, uint_size);
|
||
Set_RM_Size (gnat_entity, uint_size);
|
||
}
|
||
else
|
||
Set_Esize (gnat_entity, annotate_value (gnu_size));
|
||
}
|
||
|
||
if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
|
||
Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
|
||
}
|
||
|
||
if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
|
||
DECL_ARTIFICIAL (gnu_decl) = 1;
|
||
|
||
if (!debug_info_p && DECL_P (gnu_decl)
|
||
&& TREE_CODE (gnu_decl) != FUNCTION_DECL
|
||
&& No (Renamed_Object (gnat_entity)))
|
||
DECL_IGNORED_P (gnu_decl) = 1;
|
||
|
||
/* If we haven't already, associate the ..._DECL node that we just made with
|
||
the input GNAT entity node. */
|
||
if (!saved)
|
||
save_gnu_tree (gnat_entity, gnu_decl, false);
|
||
|
||
/* If this is an enumeration or floating-point type, we were not able to set
|
||
the bounds since they refer to the type. These are always static. */
|
||
if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
|
||
|| (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
|
||
{
|
||
tree gnu_scalar_type = gnu_type;
|
||
tree gnu_low_bound, gnu_high_bound;
|
||
|
||
/* If this is a padded type, we need to use the underlying type. */
|
||
if (TYPE_IS_PADDING_P (gnu_scalar_type))
|
||
gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
|
||
|
||
/* If this is a floating point type and we haven't set a floating
|
||
point type yet, use this in the evaluation of the bounds. */
|
||
if (!longest_float_type_node && kind == E_Floating_Point_Type)
|
||
longest_float_type_node = gnu_scalar_type;
|
||
|
||
gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity));
|
||
gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity));
|
||
|
||
if (kind == E_Enumeration_Type)
|
||
{
|
||
/* Enumeration types have specific RM bounds. */
|
||
SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound);
|
||
SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound);
|
||
|
||
/* Write full debugging information. Since this has both a
|
||
typedef and a tag, avoid outputting the name twice. */
|
||
DECL_ARTIFICIAL (gnu_decl) = 1;
|
||
rest_of_type_decl_compilation (gnu_decl);
|
||
}
|
||
|
||
else
|
||
{
|
||
/* Floating-point types don't have specific RM bounds. */
|
||
TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound;
|
||
TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound;
|
||
}
|
||
}
|
||
|
||
/* If we deferred processing of incomplete types, re-enable it. If there
|
||
were no other disables and we have some to process, do so. */
|
||
if (this_deferred && --defer_incomplete_level == 0)
|
||
{
|
||
if (defer_incomplete_list)
|
||
{
|
||
struct incomplete *incp, *next;
|
||
|
||
/* We are back to level 0 for the deferring of incomplete types.
|
||
But processing these incomplete types below may itself require
|
||
deferring, so preserve what we have and restart from scratch. */
|
||
incp = defer_incomplete_list;
|
||
defer_incomplete_list = NULL;
|
||
|
||
/* For finalization, however, all types must be complete so we
|
||
cannot do the same because deferred incomplete types may end up
|
||
referencing each other. Process them all recursively first. */
|
||
defer_finalize_level++;
|
||
|
||
for (; incp; incp = next)
|
||
{
|
||
next = incp->next;
|
||
|
||
if (incp->old_type)
|
||
update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
|
||
gnat_to_gnu_type (incp->full_type));
|
||
free (incp);
|
||
}
|
||
|
||
defer_finalize_level--;
|
||
}
|
||
|
||
/* All the deferred incomplete types have been processed so we can
|
||
now proceed with the finalization of the deferred types. */
|
||
if (defer_finalize_level == 0 && defer_finalize_list)
|
||
{
|
||
unsigned int i;
|
||
tree t;
|
||
|
||
for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
|
||
rest_of_type_decl_compilation_no_defer (t);
|
||
|
||
VEC_free (tree, heap, defer_finalize_list);
|
||
}
|
||
}
|
||
|
||
/* If we are not defining this type, see if it's in the incomplete list.
|
||
If so, handle that list entry now. */
|
||
else if (!definition)
|
||
{
|
||
struct incomplete *incp;
|
||
|
||
for (incp = defer_incomplete_list; incp; incp = incp->next)
|
||
if (incp->old_type && incp->full_type == gnat_entity)
|
||
{
|
||
update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
|
||
TREE_TYPE (gnu_decl));
|
||
incp->old_type = NULL_TREE;
|
||
}
|
||
}
|
||
|
||
if (this_global)
|
||
force_global--;
|
||
|
||
/* If this is a packed array type whose original array type is itself
|
||
an Itype without freeze node, make sure the latter is processed. */
|
||
if (Is_Packed_Array_Type (gnat_entity)
|
||
&& Is_Itype (Original_Array_Type (gnat_entity))
|
||
&& No (Freeze_Node (Original_Array_Type (gnat_entity)))
|
||
&& !present_gnu_tree (Original_Array_Type (gnat_entity)))
|
||
gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
|
||
|
||
return gnu_decl;
|
||
}
|
||
|
||
/* Similar, but if the returned value is a COMPONENT_REF, return the
|
||
FIELD_DECL. */
|
||
|
||
tree
|
||
gnat_to_gnu_field_decl (Entity_Id gnat_entity)
|
||
{
|
||
tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
|
||
|
||
if (TREE_CODE (gnu_field) == COMPONENT_REF)
|
||
gnu_field = TREE_OPERAND (gnu_field, 1);
|
||
|
||
return gnu_field;
|
||
}
|
||
|
||
/* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
|
||
the GCC type corresponding to that entity. */
|
||
|
||
tree
|
||
gnat_to_gnu_type (Entity_Id gnat_entity)
|
||
{
|
||
tree gnu_decl;
|
||
|
||
/* The back end never attempts to annotate generic types. */
|
||
if (Is_Generic_Type (gnat_entity) && type_annotate_only)
|
||
return void_type_node;
|
||
|
||
gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
|
||
gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
|
||
|
||
return TREE_TYPE (gnu_decl);
|
||
}
|
||
|
||
/* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
|
||
the unpadded version of the GCC type corresponding to that entity. */
|
||
|
||
tree
|
||
get_unpadded_type (Entity_Id gnat_entity)
|
||
{
|
||
tree type = gnat_to_gnu_type (gnat_entity);
|
||
|
||
if (TYPE_IS_PADDING_P (type))
|
||
type = TREE_TYPE (TYPE_FIELDS (type));
|
||
|
||
return type;
|
||
}
|
||
|
||
/* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
|
||
Every TYPE_DECL generated for a type definition must be passed
|
||
to this function once everything else has been done for it. */
|
||
|
||
void
|
||
rest_of_type_decl_compilation (tree decl)
|
||
{
|
||
/* We need to defer finalizing the type if incomplete types
|
||
are being deferred or if they are being processed. */
|
||
if (defer_incomplete_level || defer_finalize_level)
|
||
VEC_safe_push (tree, heap, defer_finalize_list, decl);
|
||
else
|
||
rest_of_type_decl_compilation_no_defer (decl);
|
||
}
|
||
|
||
/* Same as above but without deferring the compilation. This
|
||
function should not be invoked directly on a TYPE_DECL. */
|
||
|
||
static void
|
||
rest_of_type_decl_compilation_no_defer (tree decl)
|
||
{
|
||
const int toplev = global_bindings_p ();
|
||
tree t = TREE_TYPE (decl);
|
||
|
||
rest_of_decl_compilation (decl, toplev, 0);
|
||
|
||
/* Now process all the variants. This is needed for STABS. */
|
||
for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
|
||
{
|
||
if (t == TREE_TYPE (decl))
|
||
continue;
|
||
|
||
if (!TYPE_STUB_DECL (t))
|
||
TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
|
||
|
||
rest_of_type_compilation (t, toplev);
|
||
}
|
||
}
|
||
|
||
/* Finalize any From_With_Type incomplete types. We do this after processing
|
||
our compilation unit and after processing its spec, if this is a body. */
|
||
|
||
void
|
||
finalize_from_with_types (void)
|
||
{
|
||
struct incomplete *incp = defer_limited_with;
|
||
struct incomplete *next;
|
||
|
||
defer_limited_with = 0;
|
||
for (; incp; incp = next)
|
||
{
|
||
next = incp->next;
|
||
|
||
if (incp->old_type != 0)
|
||
update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
|
||
gnat_to_gnu_type (incp->full_type));
|
||
free (incp);
|
||
}
|
||
}
|
||
|
||
/* Return the equivalent type to be used for GNAT_ENTITY, if it's a
|
||
kind of type (such E_Task_Type) that has a different type which Gigi
|
||
uses for its representation. If the type does not have a special type
|
||
for its representation, return GNAT_ENTITY. If a type is supposed to
|
||
exist, but does not, abort unless annotating types, in which case
|
||
return Empty. If GNAT_ENTITY is Empty, return Empty. */
|
||
|
||
Entity_Id
|
||
Gigi_Equivalent_Type (Entity_Id gnat_entity)
|
||
{
|
||
Entity_Id gnat_equiv = gnat_entity;
|
||
|
||
if (No (gnat_entity))
|
||
return gnat_entity;
|
||
|
||
switch (Ekind (gnat_entity))
|
||
{
|
||
case E_Class_Wide_Subtype:
|
||
if (Present (Equivalent_Type (gnat_entity)))
|
||
gnat_equiv = Equivalent_Type (gnat_entity);
|
||
break;
|
||
|
||
case E_Access_Protected_Subprogram_Type:
|
||
case E_Anonymous_Access_Protected_Subprogram_Type:
|
||
gnat_equiv = Equivalent_Type (gnat_entity);
|
||
break;
|
||
|
||
case E_Class_Wide_Type:
|
||
gnat_equiv = Root_Type (gnat_entity);
|
||
break;
|
||
|
||
case E_Task_Type:
|
||
case E_Task_Subtype:
|
||
case E_Protected_Type:
|
||
case E_Protected_Subtype:
|
||
gnat_equiv = Corresponding_Record_Type (gnat_entity);
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
gcc_assert (Present (gnat_equiv) || type_annotate_only);
|
||
return gnat_equiv;
|
||
}
|
||
|
||
/* Return a GCC tree for a type corresponding to the component type of the
|
||
array type or subtype GNAT_ARRAY. DEFINITION is true if this component
|
||
is for an array being defined. DEBUG_INFO_P is true if we need to write
|
||
debug information for other types that we may create in the process. */
|
||
|
||
static tree
|
||
gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition,
|
||
bool debug_info_p)
|
||
{
|
||
tree gnu_type = gnat_to_gnu_type (Component_Type (gnat_array));
|
||
tree gnu_comp_size;
|
||
|
||
/* Try to get a smaller form of the component if needed. */
|
||
if ((Is_Packed (gnat_array)
|
||
|| Has_Component_Size_Clause (gnat_array))
|
||
&& !Is_Bit_Packed_Array (gnat_array)
|
||
&& !Has_Aliased_Components (gnat_array)
|
||
&& !Strict_Alignment (Component_Type (gnat_array))
|
||
&& TREE_CODE (gnu_type) == RECORD_TYPE
|
||
&& !TYPE_FAT_POINTER_P (gnu_type)
|
||
&& host_integerp (TYPE_SIZE (gnu_type), 1))
|
||
gnu_type = make_packable_type (gnu_type, false);
|
||
|
||
if (Has_Atomic_Components (gnat_array))
|
||
check_ok_for_atomic (gnu_type, gnat_array, true);
|
||
|
||
/* Get and validate any specified Component_Size. */
|
||
gnu_comp_size
|
||
= validate_size (Component_Size (gnat_array), gnu_type, gnat_array,
|
||
Is_Bit_Packed_Array (gnat_array) ? TYPE_DECL : VAR_DECL,
|
||
true, Has_Component_Size_Clause (gnat_array));
|
||
|
||
/* If the array has aliased components and the component size can be zero,
|
||
force at least unit size to ensure that the components have distinct
|
||
addresses. */
|
||
if (!gnu_comp_size
|
||
&& Has_Aliased_Components (gnat_array)
|
||
&& (integer_zerop (TYPE_SIZE (gnu_type))
|
||
|| (TREE_CODE (gnu_type) == ARRAY_TYPE
|
||
&& !TREE_CONSTANT (TYPE_SIZE (gnu_type)))))
|
||
gnu_comp_size
|
||
= size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node);
|
||
|
||
/* If the component type is a RECORD_TYPE that has a self-referential size,
|
||
then use the maximum size for the component size. */
|
||
if (!gnu_comp_size
|
||
&& TREE_CODE (gnu_type) == RECORD_TYPE
|
||
&& CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
|
||
gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
|
||
|
||
/* Honor the component size. This is not needed for bit-packed arrays. */
|
||
if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array))
|
||
{
|
||
tree orig_type = gnu_type;
|
||
unsigned int max_align;
|
||
|
||
/* If an alignment is specified, use it as a cap on the component type
|
||
so that it can be honored for the whole type. But ignore it for the
|
||
original type of packed array types. */
|
||
if (No (Packed_Array_Type (gnat_array)) && Known_Alignment (gnat_array))
|
||
max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0);
|
||
else
|
||
max_align = 0;
|
||
|
||
gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false);
|
||
if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align)
|
||
gnu_type = orig_type;
|
||
else
|
||
orig_type = gnu_type;
|
||
|
||
gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array,
|
||
true, false, definition, true);
|
||
|
||
/* If a padding record was made, declare it now since it will never be
|
||
declared otherwise. This is necessary to ensure that its subtrees
|
||
are properly marked. */
|
||
if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type)))
|
||
create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true,
|
||
debug_info_p, gnat_array);
|
||
}
|
||
|
||
if (Has_Volatile_Components (Base_Type (gnat_array)))
|
||
gnu_type
|
||
= build_qualified_type (gnu_type,
|
||
TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE);
|
||
|
||
return gnu_type;
|
||
}
|
||
|
||
/* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
|
||
using MECH as its passing mechanism, to be placed in the parameter
|
||
list built for GNAT_SUBPROG. Assume a foreign convention for the
|
||
latter if FOREIGN is true. Also set CICO to true if the parameter
|
||
must use the copy-in copy-out implementation mechanism.
|
||
|
||
The returned tree is a PARM_DECL, except for those cases where no
|
||
parameter needs to be actually passed to the subprogram; the type
|
||
of this "shadow" parameter is then returned instead. */
|
||
|
||
static tree
|
||
gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
|
||
Entity_Id gnat_subprog, bool foreign, bool *cico)
|
||
{
|
||
tree gnu_param_name = get_entity_name (gnat_param);
|
||
tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
|
||
tree gnu_param_type_alt = NULL_TREE;
|
||
bool in_param = (Ekind (gnat_param) == E_In_Parameter);
|
||
/* The parameter can be indirectly modified if its address is taken. */
|
||
bool ro_param = in_param && !Address_Taken (gnat_param);
|
||
bool by_return = false, by_component_ptr = false, by_ref = false;
|
||
tree gnu_param;
|
||
|
||
/* Copy-return is used only for the first parameter of a valued procedure.
|
||
It's a copy mechanism for which a parameter is never allocated. */
|
||
if (mech == By_Copy_Return)
|
||
{
|
||
gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
|
||
mech = By_Copy;
|
||
by_return = true;
|
||
}
|
||
|
||
/* If this is either a foreign function or if the underlying type won't
|
||
be passed by reference, strip off possible padding type. */
|
||
if (TYPE_IS_PADDING_P (gnu_param_type))
|
||
{
|
||
tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
|
||
|
||
if (mech == By_Reference
|
||
|| foreign
|
||
|| (!must_pass_by_ref (unpadded_type)
|
||
&& (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
|
||
gnu_param_type = unpadded_type;
|
||
}
|
||
|
||
/* If this is a read-only parameter, make a variant of the type that is
|
||
read-only. ??? However, if this is an unconstrained array, that type
|
||
can be very complex, so skip it for now. Likewise for any other
|
||
self-referential type. */
|
||
if (ro_param
|
||
&& TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
|
||
&& !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
|
||
gnu_param_type = build_qualified_type (gnu_param_type,
|
||
(TYPE_QUALS (gnu_param_type)
|
||
| TYPE_QUAL_CONST));
|
||
|
||
/* For foreign conventions, pass arrays as pointers to the element type.
|
||
First check for unconstrained array and get the underlying array. */
|
||
if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
|
||
gnu_param_type
|
||
= TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
|
||
|
||
/* VMS descriptors are themselves passed by reference. */
|
||
if (mech == By_Short_Descriptor ||
|
||
(mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
|
||
gnu_param_type
|
||
= build_pointer_type (build_vms_descriptor32 (gnu_param_type,
|
||
Mechanism (gnat_param),
|
||
gnat_subprog));
|
||
else if (mech == By_Descriptor)
|
||
{
|
||
/* Build both a 32-bit and 64-bit descriptor, one of which will be
|
||
chosen in fill_vms_descriptor. */
|
||
gnu_param_type_alt
|
||
= build_pointer_type (build_vms_descriptor32 (gnu_param_type,
|
||
Mechanism (gnat_param),
|
||
gnat_subprog));
|
||
gnu_param_type
|
||
= build_pointer_type (build_vms_descriptor (gnu_param_type,
|
||
Mechanism (gnat_param),
|
||
gnat_subprog));
|
||
}
|
||
|
||
/* Arrays are passed as pointers to element type for foreign conventions. */
|
||
else if (foreign
|
||
&& mech != By_Copy
|
||
&& TREE_CODE (gnu_param_type) == ARRAY_TYPE)
|
||
{
|
||
/* Strip off any multi-dimensional entries, then strip
|
||
off the last array to get the component type. */
|
||
while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
|
||
&& TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
|
||
gnu_param_type = TREE_TYPE (gnu_param_type);
|
||
|
||
by_component_ptr = true;
|
||
gnu_param_type = TREE_TYPE (gnu_param_type);
|
||
|
||
if (ro_param)
|
||
gnu_param_type = build_qualified_type (gnu_param_type,
|
||
(TYPE_QUALS (gnu_param_type)
|
||
| TYPE_QUAL_CONST));
|
||
|
||
gnu_param_type = build_pointer_type (gnu_param_type);
|
||
}
|
||
|
||
/* Fat pointers are passed as thin pointers for foreign conventions. */
|
||
else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type))
|
||
gnu_param_type
|
||
= make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
|
||
|
||
/* If we must pass or were requested to pass by reference, do so.
|
||
If we were requested to pass by copy, do so.
|
||
Otherwise, for foreign conventions, pass In Out or Out parameters
|
||
or aggregates by reference. For COBOL and Fortran, pass all
|
||
integer and FP types that way too. For Convention Ada, use
|
||
the standard Ada default. */
|
||
else if (must_pass_by_ref (gnu_param_type)
|
||
|| mech == By_Reference
|
||
|| (mech != By_Copy
|
||
&& ((foreign
|
||
&& (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
|
||
|| (foreign
|
||
&& (Convention (gnat_subprog) == Convention_Fortran
|
||
|| Convention (gnat_subprog) == Convention_COBOL)
|
||
&& (INTEGRAL_TYPE_P (gnu_param_type)
|
||
|| FLOAT_TYPE_P (gnu_param_type)))
|
||
|| (!foreign
|
||
&& default_pass_by_ref (gnu_param_type)))))
|
||
{
|
||
gnu_param_type = build_reference_type (gnu_param_type);
|
||
by_ref = true;
|
||
}
|
||
|
||
/* Pass In Out or Out parameters using copy-in copy-out mechanism. */
|
||
else if (!in_param)
|
||
*cico = true;
|
||
|
||
if (mech == By_Copy && (by_ref || by_component_ptr))
|
||
post_error ("?cannot pass & by copy", gnat_param);
|
||
|
||
/* If this is an Out parameter that isn't passed by reference and isn't
|
||
a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
|
||
it will be a VAR_DECL created when we process the procedure, so just
|
||
return its type. For the special parameter of a valued procedure,
|
||
never pass it in.
|
||
|
||
An exception is made to cover the RM-6.4.1 rule requiring "by copy"
|
||
Out parameters with discriminants or implicit initial values to be
|
||
handled like In Out parameters. These type are normally built as
|
||
aggregates, hence passed by reference, except for some packed arrays
|
||
which end up encoded in special integer types.
|
||
|
||
The exception we need to make is then for packed arrays of records
|
||
with discriminants or implicit initial values. We have no light/easy
|
||
way to check for the latter case, so we merely check for packed arrays
|
||
of records. This may lead to useless copy-in operations, but in very
|
||
rare cases only, as these would be exceptions in a set of already
|
||
exceptional situations. */
|
||
if (Ekind (gnat_param) == E_Out_Parameter
|
||
&& !by_ref
|
||
&& (by_return
|
||
|| (mech != By_Descriptor
|
||
&& mech != By_Short_Descriptor
|
||
&& !POINTER_TYPE_P (gnu_param_type)
|
||
&& !AGGREGATE_TYPE_P (gnu_param_type)))
|
||
&& !(Is_Array_Type (Etype (gnat_param))
|
||
&& Is_Packed (Etype (gnat_param))
|
||
&& Is_Composite_Type (Component_Type (Etype (gnat_param)))))
|
||
return gnu_param_type;
|
||
|
||
gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
|
||
ro_param || by_ref || by_component_ptr);
|
||
DECL_BY_REF_P (gnu_param) = by_ref;
|
||
DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
|
||
DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
|
||
mech == By_Short_Descriptor);
|
||
DECL_POINTS_TO_READONLY_P (gnu_param)
|
||
= (ro_param && (by_ref || by_component_ptr));
|
||
|
||
/* Save the alternate descriptor type, if any. */
|
||
if (gnu_param_type_alt)
|
||
SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
|
||
|
||
/* If no Mechanism was specified, indicate what we're using, then
|
||
back-annotate it. */
|
||
if (mech == Default)
|
||
mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
|
||
|
||
Set_Mechanism (gnat_param, mech);
|
||
return gnu_param;
|
||
}
|
||
|
||
/* Return true if DISCR1 and DISCR2 represent the same discriminant. */
|
||
|
||
static bool
|
||
same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
|
||
{
|
||
while (Present (Corresponding_Discriminant (discr1)))
|
||
discr1 = Corresponding_Discriminant (discr1);
|
||
|
||
while (Present (Corresponding_Discriminant (discr2)))
|
||
discr2 = Corresponding_Discriminant (discr2);
|
||
|
||
return
|
||
Original_Record_Component (discr1) == Original_Record_Component (discr2);
|
||
}
|
||
|
||
/* Return true if the array type GNU_TYPE, which represents a dimension of
|
||
GNAT_TYPE, has a non-aliased component in the back-end sense. */
|
||
|
||
static bool
|
||
array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type)
|
||
{
|
||
/* If the array type is not the innermost dimension of the GNAT type,
|
||
then it has a non-aliased component. */
|
||
if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
|
||
&& TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
|
||
return true;
|
||
|
||
/* If the array type has an aliased component in the front-end sense,
|
||
then it also has an aliased component in the back-end sense. */
|
||
if (Has_Aliased_Components (gnat_type))
|
||
return false;
|
||
|
||
/* If this is a derived type, then it has a non-aliased component if
|
||
and only if its parent type also has one. */
|
||
if (Is_Derived_Type (gnat_type))
|
||
{
|
||
tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type));
|
||
int index;
|
||
if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE)
|
||
gnu_parent_type
|
||
= TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type))));
|
||
for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--)
|
||
gnu_parent_type = TREE_TYPE (gnu_parent_type);
|
||
return TYPE_NONALIASED_COMPONENT (gnu_parent_type);
|
||
}
|
||
|
||
/* Otherwise, rely exclusively on properties of the element type. */
|
||
return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
|
||
}
|
||
|
||
/* Return true if GNAT_ADDRESS is a value known at compile-time. */
|
||
|
||
static bool
|
||
compile_time_known_address_p (Node_Id gnat_address)
|
||
{
|
||
/* Catch System'To_Address. */
|
||
if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
|
||
gnat_address = Expression (gnat_address);
|
||
|
||
return Compile_Time_Known_Value (gnat_address);
|
||
}
|
||
|
||
/* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e. if the
|
||
inequality HB >= LB-1 is true. LB and HB are the low and high bounds. */
|
||
|
||
static bool
|
||
cannot_be_superflat_p (Node_Id gnat_range)
|
||
{
|
||
Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range);
|
||
Node_Id scalar_range;
|
||
tree gnu_lb, gnu_hb, gnu_lb_minus_one;
|
||
|
||
/* If the low bound is not constant, try to find an upper bound. */
|
||
while (Nkind (gnat_lb) != N_Integer_Literal
|
||
&& (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype
|
||
|| Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype)
|
||
&& (scalar_range = Scalar_Range (Etype (gnat_lb)))
|
||
&& (Nkind (scalar_range) == N_Signed_Integer_Type_Definition
|
||
|| Nkind (scalar_range) == N_Range))
|
||
gnat_lb = High_Bound (scalar_range);
|
||
|
||
/* If the high bound is not constant, try to find a lower bound. */
|
||
while (Nkind (gnat_hb) != N_Integer_Literal
|
||
&& (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype
|
||
|| Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype)
|
||
&& (scalar_range = Scalar_Range (Etype (gnat_hb)))
|
||
&& (Nkind (scalar_range) == N_Signed_Integer_Type_Definition
|
||
|| Nkind (scalar_range) == N_Range))
|
||
gnat_hb = Low_Bound (scalar_range);
|
||
|
||
/* If we have failed to find constant bounds, punt. */
|
||
if (Nkind (gnat_lb) != N_Integer_Literal
|
||
|| Nkind (gnat_hb) != N_Integer_Literal)
|
||
return false;
|
||
|
||
/* We need at least a signed 64-bit type to catch most cases. */
|
||
gnu_lb = UI_To_gnu (Intval (gnat_lb), sbitsizetype);
|
||
gnu_hb = UI_To_gnu (Intval (gnat_hb), sbitsizetype);
|
||
if (TREE_OVERFLOW (gnu_lb) || TREE_OVERFLOW (gnu_hb))
|
||
return false;
|
||
|
||
/* If the low bound is the smallest integer, nothing can be smaller. */
|
||
gnu_lb_minus_one = size_binop (MINUS_EXPR, gnu_lb, sbitsize_one_node);
|
||
if (TREE_OVERFLOW (gnu_lb_minus_one))
|
||
return true;
|
||
|
||
return !tree_int_cst_lt (gnu_hb, gnu_lb_minus_one);
|
||
}
|
||
|
||
/* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */
|
||
|
||
static bool
|
||
constructor_address_p (tree gnu_expr)
|
||
{
|
||
while (TREE_CODE (gnu_expr) == NOP_EXPR
|
||
|| TREE_CODE (gnu_expr) == CONVERT_EXPR
|
||
|| TREE_CODE (gnu_expr) == NON_LVALUE_EXPR)
|
||
gnu_expr = TREE_OPERAND (gnu_expr, 0);
|
||
|
||
return (TREE_CODE (gnu_expr) == ADDR_EXPR
|
||
&& TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR);
|
||
}
|
||
|
||
/* Given GNAT_ENTITY, elaborate all expressions that are required to
|
||
be elaborated at the point of its definition, but do nothing else. */
|
||
|
||
void
|
||
elaborate_entity (Entity_Id gnat_entity)
|
||
{
|
||
switch (Ekind (gnat_entity))
|
||
{
|
||
case E_Signed_Integer_Subtype:
|
||
case E_Modular_Integer_Subtype:
|
||
case E_Enumeration_Subtype:
|
||
case E_Ordinary_Fixed_Point_Subtype:
|
||
case E_Decimal_Fixed_Point_Subtype:
|
||
case E_Floating_Point_Subtype:
|
||
{
|
||
Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
|
||
Node_Id gnat_hb = Type_High_Bound (gnat_entity);
|
||
|
||
/* ??? Tests to avoid Constraint_Error in static expressions
|
||
are needed until after the front stops generating bogus
|
||
conversions on bounds of real types. */
|
||
if (!Raises_Constraint_Error (gnat_lb))
|
||
elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
|
||
true, false, Needs_Debug_Info (gnat_entity));
|
||
if (!Raises_Constraint_Error (gnat_hb))
|
||
elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
|
||
true, false, Needs_Debug_Info (gnat_entity));
|
||
break;
|
||
}
|
||
|
||
case E_Record_Type:
|
||
{
|
||
Node_Id full_definition = Declaration_Node (gnat_entity);
|
||
Node_Id record_definition = Type_Definition (full_definition);
|
||
|
||
/* If this is a record extension, go a level further to find the
|
||
record definition. */
|
||
if (Nkind (record_definition) == N_Derived_Type_Definition)
|
||
record_definition = Record_Extension_Part (record_definition);
|
||
}
|
||
break;
|
||
|
||
case E_Record_Subtype:
|
||
case E_Private_Subtype:
|
||
case E_Limited_Private_Subtype:
|
||
case E_Record_Subtype_With_Private:
|
||
if (Is_Constrained (gnat_entity)
|
||
&& Has_Discriminants (gnat_entity)
|
||
&& Present (Discriminant_Constraint (gnat_entity)))
|
||
{
|
||
Node_Id gnat_discriminant_expr;
|
||
Entity_Id gnat_field;
|
||
|
||
for (gnat_field
|
||
= First_Discriminant (Implementation_Base_Type (gnat_entity)),
|
||
gnat_discriminant_expr
|
||
= First_Elmt (Discriminant_Constraint (gnat_entity));
|
||
Present (gnat_field);
|
||
gnat_field = Next_Discriminant (gnat_field),
|
||
gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
|
||
/* ??? For now, ignore access discriminants. */
|
||
if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
|
||
elaborate_expression (Node (gnat_discriminant_expr),
|
||
gnat_entity, get_entity_name (gnat_field),
|
||
true, false, false);
|
||
}
|
||
break;
|
||
|
||
}
|
||
}
|
||
|
||
/* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
|
||
any entities on its entity chain similarly. */
|
||
|
||
void
|
||
mark_out_of_scope (Entity_Id gnat_entity)
|
||
{
|
||
Entity_Id gnat_sub_entity;
|
||
unsigned int kind = Ekind (gnat_entity);
|
||
|
||
/* If this has an entity list, process all in the list. */
|
||
if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
|
||
|| IN (kind, Private_Kind)
|
||
|| kind == E_Block || kind == E_Entry || kind == E_Entry_Family
|
||
|| kind == E_Function || kind == E_Generic_Function
|
||
|| kind == E_Generic_Package || kind == E_Generic_Procedure
|
||
|| kind == E_Loop || kind == E_Operator || kind == E_Package
|
||
|| kind == E_Package_Body || kind == E_Procedure
|
||
|| kind == E_Record_Type || kind == E_Record_Subtype
|
||
|| kind == E_Subprogram_Body || kind == E_Subprogram_Type)
|
||
for (gnat_sub_entity = First_Entity (gnat_entity);
|
||
Present (gnat_sub_entity);
|
||
gnat_sub_entity = Next_Entity (gnat_sub_entity))
|
||
if (Scope (gnat_sub_entity) == gnat_entity
|
||
&& gnat_sub_entity != gnat_entity)
|
||
mark_out_of_scope (gnat_sub_entity);
|
||
|
||
/* Now clear this if it has been defined, but only do so if it isn't
|
||
a subprogram or parameter. We could refine this, but it isn't
|
||
worth it. If this is statically allocated, it is supposed to
|
||
hang around out of cope. */
|
||
if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
|
||
&& kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
|
||
{
|
||
save_gnu_tree (gnat_entity, NULL_TREE, true);
|
||
save_gnu_tree (gnat_entity, error_mark_node, true);
|
||
}
|
||
}
|
||
|
||
/* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
|
||
If this is a multi-dimensional array type, do this recursively.
|
||
|
||
OP may be
|
||
- ALIAS_SET_COPY: the new set is made a copy of the old one.
|
||
- ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
|
||
- ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
|
||
|
||
static void
|
||
relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
|
||
{
|
||
/* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
|
||
of a one-dimensional array, since the padding has the same alias set
|
||
as the field type, but if it's a multi-dimensional array, we need to
|
||
see the inner types. */
|
||
while (TREE_CODE (gnu_old_type) == RECORD_TYPE
|
||
&& (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
|
||
|| TYPE_PADDING_P (gnu_old_type)))
|
||
gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
|
||
|
||
/* Unconstrained array types are deemed incomplete and would thus be given
|
||
alias set 0. Retrieve the underlying array type. */
|
||
if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
|
||
gnu_old_type
|
||
= TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
|
||
if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
|
||
gnu_new_type
|
||
= TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
|
||
|
||
if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
|
||
&& TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
|
||
&& TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
|
||
relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
|
||
|
||
switch (op)
|
||
{
|
||
case ALIAS_SET_COPY:
|
||
/* The alias set shouldn't be copied between array types with different
|
||
aliasing settings because this can break the aliasing relationship
|
||
between the array type and its element type. */
|
||
#ifndef ENABLE_CHECKING
|
||
if (flag_strict_aliasing)
|
||
#endif
|
||
gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
|
||
&& TREE_CODE (gnu_old_type) == ARRAY_TYPE
|
||
&& TYPE_NONALIASED_COMPONENT (gnu_new_type)
|
||
!= TYPE_NONALIASED_COMPONENT (gnu_old_type)));
|
||
|
||
TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
|
||
break;
|
||
|
||
case ALIAS_SET_SUBSET:
|
||
case ALIAS_SET_SUPERSET:
|
||
{
|
||
alias_set_type old_set = get_alias_set (gnu_old_type);
|
||
alias_set_type new_set = get_alias_set (gnu_new_type);
|
||
|
||
/* Do nothing if the alias sets conflict. This ensures that we
|
||
never call record_alias_subset several times for the same pair
|
||
or at all for alias set 0. */
|
||
if (!alias_sets_conflict_p (old_set, new_set))
|
||
{
|
||
if (op == ALIAS_SET_SUBSET)
|
||
record_alias_subset (old_set, new_set);
|
||
else
|
||
record_alias_subset (new_set, old_set);
|
||
}
|
||
}
|
||
break;
|
||
|
||
default:
|
||
gcc_unreachable ();
|
||
}
|
||
|
||
record_component_aliases (gnu_new_type);
|
||
}
|
||
|
||
/* Return true if the size represented by GNU_SIZE can be handled by an
|
||
allocation. If STATIC_P is true, consider only what can be done with a
|
||
static allocation. */
|
||
|
||
static bool
|
||
allocatable_size_p (tree gnu_size, bool static_p)
|
||
{
|
||
HOST_WIDE_INT our_size;
|
||
|
||
/* If this is not a static allocation, the only case we want to forbid
|
||
is an overflowing size. That will be converted into a raise a
|
||
Storage_Error. */
|
||
if (!static_p)
|
||
return !(TREE_CODE (gnu_size) == INTEGER_CST
|
||
&& TREE_OVERFLOW (gnu_size));
|
||
|
||
/* Otherwise, we need to deal with both variable sizes and constant
|
||
sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
|
||
since assemblers may not like very large sizes. */
|
||
if (!host_integerp (gnu_size, 1))
|
||
return false;
|
||
|
||
our_size = tree_low_cst (gnu_size, 1);
|
||
return (int) our_size == our_size;
|
||
}
|
||
|
||
/* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
|
||
NAME, ARGS and ERROR_POINT. */
|
||
|
||
static void
|
||
prepend_one_attribute_to (struct attrib ** attr_list,
|
||
enum attr_type attr_type,
|
||
tree attr_name,
|
||
tree attr_args,
|
||
Node_Id attr_error_point)
|
||
{
|
||
struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
|
||
|
||
attr->type = attr_type;
|
||
attr->name = attr_name;
|
||
attr->args = attr_args;
|
||
attr->error_point = attr_error_point;
|
||
|
||
attr->next = *attr_list;
|
||
*attr_list = attr;
|
||
}
|
||
|
||
/* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
|
||
|
||
static void
|
||
prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
|
||
{
|
||
Node_Id gnat_temp;
|
||
|
||
/* Attributes are stored as Representation Item pragmas. */
|
||
|
||
for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
|
||
gnat_temp = Next_Rep_Item (gnat_temp))
|
||
if (Nkind (gnat_temp) == N_Pragma)
|
||
{
|
||
tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
|
||
Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
|
||
enum attr_type etype;
|
||
|
||
/* Map the kind of pragma at hand. Skip if this is not one
|
||
we know how to handle. */
|
||
|
||
switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
|
||
{
|
||
case Pragma_Machine_Attribute:
|
||
etype = ATTR_MACHINE_ATTRIBUTE;
|
||
break;
|
||
|
||
case Pragma_Linker_Alias:
|
||
etype = ATTR_LINK_ALIAS;
|
||
break;
|
||
|
||
case Pragma_Linker_Section:
|
||
etype = ATTR_LINK_SECTION;
|
||
break;
|
||
|
||
case Pragma_Linker_Constructor:
|
||
etype = ATTR_LINK_CONSTRUCTOR;
|
||
break;
|
||
|
||
case Pragma_Linker_Destructor:
|
||
etype = ATTR_LINK_DESTRUCTOR;
|
||
break;
|
||
|
||
case Pragma_Weak_External:
|
||
etype = ATTR_WEAK_EXTERNAL;
|
||
break;
|
||
|
||
case Pragma_Thread_Local_Storage:
|
||
etype = ATTR_THREAD_LOCAL_STORAGE;
|
||
break;
|
||
|
||
default:
|
||
continue;
|
||
}
|
||
|
||
/* See what arguments we have and turn them into GCC trees for
|
||
attribute handlers. These expect identifier for strings. We
|
||
handle at most two arguments, static expressions only. */
|
||
|
||
if (Present (gnat_assoc) && Present (First (gnat_assoc)))
|
||
{
|
||
Node_Id gnat_arg0 = Next (First (gnat_assoc));
|
||
Node_Id gnat_arg1 = Empty;
|
||
|
||
if (Present (gnat_arg0)
|
||
&& Is_Static_Expression (Expression (gnat_arg0)))
|
||
{
|
||
gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0));
|
||
|
||
if (TREE_CODE (gnu_arg0) == STRING_CST)
|
||
gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0));
|
||
|
||
gnat_arg1 = Next (gnat_arg0);
|
||
}
|
||
|
||
if (Present (gnat_arg1)
|
||
&& Is_Static_Expression (Expression (gnat_arg1)))
|
||
{
|
||
gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1));
|
||
|
||
if (TREE_CODE (gnu_arg1) == STRING_CST)
|
||
gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1));
|
||
}
|
||
}
|
||
|
||
/* Prepend to the list now. Make a list of the argument we might
|
||
have, as GCC expects it. */
|
||
prepend_one_attribute_to
|
||
(attr_list,
|
||
etype, gnu_arg0,
|
||
(gnu_arg1 != NULL_TREE)
|
||
? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
|
||
Present (Next (First (gnat_assoc)))
|
||
? Expression (Next (First (gnat_assoc))) : gnat_temp);
|
||
}
|
||
}
|
||
|
||
/* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
|
||
type definition (either a bound or a discriminant value) for GNAT_ENTITY,
|
||
return the GCC tree to use for that expression. GNU_NAME is the suffix
|
||
to use if a variable needs to be created and DEFINITION is true if this
|
||
is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result;
|
||
otherwise, we are just elaborating the expression for side-effects. If
|
||
NEED_DEBUG is true, we need a variable for debugging purposes even if it
|
||
isn't needed for code generation. */
|
||
|
||
static tree
|
||
elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name,
|
||
bool definition, bool need_value, bool need_debug)
|
||
{
|
||
tree gnu_expr;
|
||
|
||
/* If we already elaborated this expression (e.g. it was involved
|
||
in the definition of a private type), use the old value. */
|
||
if (present_gnu_tree (gnat_expr))
|
||
return get_gnu_tree (gnat_expr);
|
||
|
||
/* If we don't need a value and this is static or a discriminant,
|
||
we don't need to do anything. */
|
||
if (!need_value
|
||
&& (Is_OK_Static_Expression (gnat_expr)
|
||
|| (Nkind (gnat_expr) == N_Identifier
|
||
&& Ekind (Entity (gnat_expr)) == E_Discriminant)))
|
||
return NULL_TREE;
|
||
|
||
/* If it's a static expression, we don't need a variable for debugging. */
|
||
if (need_debug && Is_OK_Static_Expression (gnat_expr))
|
||
need_debug = false;
|
||
|
||
/* Otherwise, convert this tree to its GCC equivalent and elaborate it. */
|
||
gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity,
|
||
gnu_name, definition, need_debug);
|
||
|
||
/* Save the expression in case we try to elaborate this entity again. Since
|
||
it's not a DECL, don't check it. Don't save if it's a discriminant. */
|
||
if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
|
||
save_gnu_tree (gnat_expr, gnu_expr, true);
|
||
|
||
return need_value ? gnu_expr : error_mark_node;
|
||
}
|
||
|
||
/* Similar, but take a GNU expression and always return a result. */
|
||
|
||
static tree
|
||
elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name,
|
||
bool definition, bool need_debug)
|
||
{
|
||
/* Skip any conversions and simple arithmetics to see if the expression
|
||
is a read-only variable.
|
||
??? This really should remain read-only, but we have to think about
|
||
the typing of the tree here. */
|
||
tree gnu_inner_expr
|
||
= skip_simple_arithmetic (remove_conversions (gnu_expr, true));
|
||
tree gnu_decl = NULL_TREE;
|
||
bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
|
||
bool expr_variable;
|
||
|
||
/* In most cases, we won't see a naked FIELD_DECL because a discriminant
|
||
reference will have been replaced with a COMPONENT_REF when the type
|
||
is being elaborated. However, there are some cases involving child
|
||
types where we will. So convert it to a COMPONENT_REF. We hope it
|
||
will be at the highest level of the expression in these cases. */
|
||
if (TREE_CODE (gnu_expr) == FIELD_DECL)
|
||
gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
|
||
build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
|
||
gnu_expr, NULL_TREE);
|
||
|
||
/* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
|
||
that is read-only, make a variable that is initialized to contain the
|
||
bound when the package containing the definition is elaborated. If
|
||
this entity is defined at top level and a bound or discriminant value
|
||
isn't a constant or a reference to a discriminant, replace the bound
|
||
by the variable; otherwise use a SAVE_EXPR if needed. Note that we
|
||
rely here on the fact that an expression cannot contain both the
|
||
discriminant and some other variable. */
|
||
expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
|
||
&& !(TREE_CODE (gnu_inner_expr) == VAR_DECL
|
||
&& (TREE_READONLY (gnu_inner_expr)
|
||
|| DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
|
||
&& !CONTAINS_PLACEHOLDER_P (gnu_expr));
|
||
|
||
/* If GNU_EXPR contains a discriminant, we can't elaborate a variable. */
|
||
if (need_debug && CONTAINS_PLACEHOLDER_P (gnu_expr))
|
||
need_debug = false;
|
||
|
||
/* Now create the variable if we need it. */
|
||
if (need_debug || (expr_variable && expr_global))
|
||
gnu_decl
|
||
= create_var_decl (create_concat_name (gnat_entity,
|
||
IDENTIFIER_POINTER (gnu_name)),
|
||
NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
|
||
!need_debug, Is_Public (gnat_entity),
|
||
!definition, false, NULL, gnat_entity);
|
||
|
||
/* We only need to use this variable if we are in global context since GCC
|
||
can do the right thing in the local case. */
|
||
if (expr_global && expr_variable)
|
||
return gnu_decl;
|
||
|
||
return expr_variable ? gnat_save_expr (gnu_expr) : gnu_expr;
|
||
}
|
||
|
||
/* Similar, but take an alignment factor and make it explicit in the tree. */
|
||
|
||
static tree
|
||
elaborate_expression_2 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name,
|
||
bool definition, bool need_debug, unsigned int align)
|
||
{
|
||
tree unit_align = size_int (align / BITS_PER_UNIT);
|
||
return
|
||
size_binop (MULT_EXPR,
|
||
elaborate_expression_1 (size_binop (EXACT_DIV_EXPR,
|
||
gnu_expr,
|
||
unit_align),
|
||
gnat_entity, gnu_name, definition,
|
||
need_debug),
|
||
unit_align);
|
||
}
|
||
|
||
/* Create a record type that contains a SIZE bytes long field of TYPE with a
|
||
starting bit position so that it is aligned to ALIGN bits, and leaving at
|
||
least ROOM bytes free before the field. BASE_ALIGN is the alignment the
|
||
record is guaranteed to get. */
|
||
|
||
tree
|
||
make_aligning_type (tree type, unsigned int align, tree size,
|
||
unsigned int base_align, int room)
|
||
{
|
||
/* We will be crafting a record type with one field at a position set to be
|
||
the next multiple of ALIGN past record'address + room bytes. We use a
|
||
record placeholder to express record'address. */
|
||
tree record_type = make_node (RECORD_TYPE);
|
||
tree record = build0 (PLACEHOLDER_EXPR, record_type);
|
||
|
||
tree record_addr_st
|
||
= convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
|
||
|
||
/* The diagram below summarizes the shape of what we manipulate:
|
||
|
||
<--------- pos ---------->
|
||
{ +------------+-------------+-----------------+
|
||
record =>{ |############| ... | field (type) |
|
||
{ +------------+-------------+-----------------+
|
||
|<-- room -->|<- voffset ->|<---- size ----->|
|
||
o o
|
||
| |
|
||
record_addr vblock_addr
|
||
|
||
Every length is in sizetype bytes there, except "pos" which has to be
|
||
set as a bit position in the GCC tree for the record. */
|
||
tree room_st = size_int (room);
|
||
tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
|
||
tree voffset_st, pos, field;
|
||
|
||
tree name = TYPE_NAME (type);
|
||
|
||
if (TREE_CODE (name) == TYPE_DECL)
|
||
name = DECL_NAME (name);
|
||
name = concat_name (name, "ALIGN");
|
||
TYPE_NAME (record_type) = name;
|
||
|
||
/* Compute VOFFSET and then POS. The next byte position multiple of some
|
||
alignment after some address is obtained by "and"ing the alignment minus
|
||
1 with the two's complement of the address. */
|
||
voffset_st = size_binop (BIT_AND_EXPR,
|
||
fold_build1 (NEGATE_EXPR, sizetype, vblock_addr_st),
|
||
size_int ((align / BITS_PER_UNIT) - 1));
|
||
|
||
/* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
|
||
pos = size_binop (MULT_EXPR,
|
||
convert (bitsizetype,
|
||
size_binop (PLUS_EXPR, room_st, voffset_st)),
|
||
bitsize_unit_node);
|
||
|
||
/* Craft the GCC record representation. We exceptionally do everything
|
||
manually here because 1) our generic circuitry is not quite ready to
|
||
handle the complex position/size expressions we are setting up, 2) we
|
||
have a strong simplifying factor at hand: we know the maximum possible
|
||
value of voffset, and 3) we have to set/reset at least the sizes in
|
||
accordance with this maximum value anyway, as we need them to convey
|
||
what should be "alloc"ated for this type.
|
||
|
||
Use -1 as the 'addressable' indication for the field to prevent the
|
||
creation of a bitfield. We don't need one, it would have damaging
|
||
consequences on the alignment computation, and create_field_decl would
|
||
make one without this special argument, for instance because of the
|
||
complex position expression. */
|
||
field = create_field_decl (get_identifier ("F"), type, record_type, size,
|
||
pos, 1, -1);
|
||
TYPE_FIELDS (record_type) = field;
|
||
|
||
TYPE_ALIGN (record_type) = base_align;
|
||
TYPE_USER_ALIGN (record_type) = 1;
|
||
|
||
TYPE_SIZE (record_type)
|
||
= size_binop (PLUS_EXPR,
|
||
size_binop (MULT_EXPR, convert (bitsizetype, size),
|
||
bitsize_unit_node),
|
||
bitsize_int (align + room * BITS_PER_UNIT));
|
||
TYPE_SIZE_UNIT (record_type)
|
||
= size_binop (PLUS_EXPR, size,
|
||
size_int (room + align / BITS_PER_UNIT));
|
||
|
||
SET_TYPE_MODE (record_type, BLKmode);
|
||
relate_alias_sets (record_type, type, ALIAS_SET_COPY);
|
||
|
||
/* Declare it now since it will never be declared otherwise. This is
|
||
necessary to ensure that its subtrees are properly marked. */
|
||
create_type_decl (name, record_type, NULL, true, false, Empty);
|
||
|
||
return record_type;
|
||
}
|
||
|
||
/* Return the result of rounding T up to ALIGN. */
|
||
|
||
static inline unsigned HOST_WIDE_INT
|
||
round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
|
||
{
|
||
t += align - 1;
|
||
t /= align;
|
||
t *= align;
|
||
return t;
|
||
}
|
||
|
||
/* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
|
||
as the field type of a packed record if IN_RECORD is true, or as the
|
||
component type of a packed array if IN_RECORD is false. See if we can
|
||
rewrite it either as a type that has a non-BLKmode, which we can pack
|
||
tighter in the packed record case, or as a smaller type. If so, return
|
||
the new type. If not, return the original type. */
|
||
|
||
static tree
|
||
make_packable_type (tree type, bool in_record)
|
||
{
|
||
unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
|
||
unsigned HOST_WIDE_INT new_size;
|
||
tree new_type, old_field, field_list = NULL_TREE;
|
||
|
||
/* No point in doing anything if the size is zero. */
|
||
if (size == 0)
|
||
return type;
|
||
|
||
new_type = make_node (TREE_CODE (type));
|
||
|
||
/* Copy the name and flags from the old type to that of the new.
|
||
Note that we rely on the pointer equality created here for
|
||
TYPE_NAME to look through conversions in various places. */
|
||
TYPE_NAME (new_type) = TYPE_NAME (type);
|
||
TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
|
||
TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
|
||
if (TREE_CODE (type) == RECORD_TYPE)
|
||
TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type);
|
||
|
||
/* If we are in a record and have a small size, set the alignment to
|
||
try for an integral mode. Otherwise set it to try for a smaller
|
||
type with BLKmode. */
|
||
if (in_record && size <= MAX_FIXED_MODE_SIZE)
|
||
{
|
||
TYPE_ALIGN (new_type) = ceil_alignment (size);
|
||
new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
|
||
}
|
||
else
|
||
{
|
||
unsigned HOST_WIDE_INT align;
|
||
|
||
/* Do not try to shrink the size if the RM size is not constant. */
|
||
if (TYPE_CONTAINS_TEMPLATE_P (type)
|
||
|| !host_integerp (TYPE_ADA_SIZE (type), 1))
|
||
return type;
|
||
|
||
/* Round the RM size up to a unit boundary to get the minimal size
|
||
for a BLKmode record. Give up if it's already the size. */
|
||
new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
|
||
new_size = round_up_to_align (new_size, BITS_PER_UNIT);
|
||
if (new_size == size)
|
||
return type;
|
||
|
||
align = new_size & -new_size;
|
||
TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
|
||
}
|
||
|
||
TYPE_USER_ALIGN (new_type) = 1;
|
||
|
||
/* Now copy the fields, keeping the position and size as we don't want
|
||
to change the layout by propagating the packedness downwards. */
|
||
for (old_field = TYPE_FIELDS (type); old_field;
|
||
old_field = TREE_CHAIN (old_field))
|
||
{
|
||
tree new_field_type = TREE_TYPE (old_field);
|
||
tree new_field, new_size;
|
||
|
||
if ((TREE_CODE (new_field_type) == RECORD_TYPE
|
||
|| TREE_CODE (new_field_type) == UNION_TYPE
|
||
|| TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
|
||
&& !TYPE_FAT_POINTER_P (new_field_type)
|
||
&& host_integerp (TYPE_SIZE (new_field_type), 1))
|
||
new_field_type = make_packable_type (new_field_type, true);
|
||
|
||
/* However, for the last field in a not already packed record type
|
||
that is of an aggregate type, we need to use the RM size in the
|
||
packable version of the record type, see finish_record_type. */
|
||
if (!TREE_CHAIN (old_field)
|
||
&& !TYPE_PACKED (type)
|
||
&& (TREE_CODE (new_field_type) == RECORD_TYPE
|
||
|| TREE_CODE (new_field_type) == UNION_TYPE
|
||
|| TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
|
||
&& !TYPE_FAT_POINTER_P (new_field_type)
|
||
&& !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
|
||
&& TYPE_ADA_SIZE (new_field_type))
|
||
new_size = TYPE_ADA_SIZE (new_field_type);
|
||
else
|
||
new_size = DECL_SIZE (old_field);
|
||
|
||
new_field
|
||
= create_field_decl (DECL_NAME (old_field), new_field_type, new_type,
|
||
new_size, bit_position (old_field),
|
||
TYPE_PACKED (type),
|
||
!DECL_NONADDRESSABLE_P (old_field));
|
||
|
||
DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
|
||
SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
|
||
if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
|
||
DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
|
||
|
||
TREE_CHAIN (new_field) = field_list;
|
||
field_list = new_field;
|
||
}
|
||
|
||
finish_record_type (new_type, nreverse (field_list), 2, false);
|
||
relate_alias_sets (new_type, type, ALIAS_SET_COPY);
|
||
|
||
/* If this is a padding record, we never want to make the size smaller
|
||
than what was specified. For QUAL_UNION_TYPE, also copy the size. */
|
||
if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE)
|
||
{
|
||
TYPE_SIZE (new_type) = TYPE_SIZE (type);
|
||
TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
|
||
new_size = size;
|
||
}
|
||
else
|
||
{
|
||
TYPE_SIZE (new_type) = bitsize_int (new_size);
|
||
TYPE_SIZE_UNIT (new_type)
|
||
= size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
|
||
}
|
||
|
||
if (!TYPE_CONTAINS_TEMPLATE_P (type))
|
||
SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
|
||
|
||
compute_record_mode (new_type);
|
||
|
||
/* Try harder to get a packable type if necessary, for example
|
||
in case the record itself contains a BLKmode field. */
|
||
if (in_record && TYPE_MODE (new_type) == BLKmode)
|
||
SET_TYPE_MODE (new_type,
|
||
mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
|
||
|
||
/* If neither the mode nor the size has shrunk, return the old type. */
|
||
if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
|
||
return type;
|
||
|
||
return new_type;
|
||
}
|
||
|
||
/* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
|
||
if needed. We have already verified that SIZE and TYPE are large enough.
|
||
GNAT_ENTITY is used to name the resulting record and to issue a warning.
|
||
IS_COMPONENT_TYPE is true if this is being done for the component type
|
||
of an array. IS_USER_TYPE is true if we must complete the original type.
|
||
DEFINITION is true if this type is being defined. SAME_RM_SIZE is true
|
||
if the RM size of the resulting type is to be set to SIZE too; otherwise,
|
||
it's set to the RM size of the original type. */
|
||
|
||
tree
|
||
maybe_pad_type (tree type, tree size, unsigned int align,
|
||
Entity_Id gnat_entity, bool is_component_type,
|
||
bool is_user_type, bool definition, bool same_rm_size)
|
||
{
|
||
tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
|
||
tree orig_size = TYPE_SIZE (type);
|
||
tree record, field;
|
||
|
||
/* If TYPE is a padded type, see if it agrees with any size and alignment
|
||
we were given. If so, return the original type. Otherwise, strip
|
||
off the padding, since we will either be returning the inner type
|
||
or repadding it. If no size or alignment is specified, use that of
|
||
the original padded type. */
|
||
if (TYPE_IS_PADDING_P (type))
|
||
{
|
||
if ((!size
|
||
|| operand_equal_p (round_up (size,
|
||
MAX (align, TYPE_ALIGN (type))),
|
||
round_up (TYPE_SIZE (type),
|
||
MAX (align, TYPE_ALIGN (type))),
|
||
0))
|
||
&& (align == 0 || align == TYPE_ALIGN (type)))
|
||
return type;
|
||
|
||
if (!size)
|
||
size = TYPE_SIZE (type);
|
||
if (align == 0)
|
||
align = TYPE_ALIGN (type);
|
||
|
||
type = TREE_TYPE (TYPE_FIELDS (type));
|
||
orig_size = TYPE_SIZE (type);
|
||
}
|
||
|
||
/* If the size is either not being changed or is being made smaller (which
|
||
is not done here and is only valid for bitfields anyway), show the size
|
||
isn't changing. Likewise, clear the alignment if it isn't being
|
||
changed. Then return if we aren't doing anything. */
|
||
if (size
|
||
&& (operand_equal_p (size, orig_size, 0)
|
||
|| (TREE_CODE (orig_size) == INTEGER_CST
|
||
&& tree_int_cst_lt (size, orig_size))))
|
||
size = NULL_TREE;
|
||
|
||
if (align == TYPE_ALIGN (type))
|
||
align = 0;
|
||
|
||
if (align == 0 && !size)
|
||
return type;
|
||
|
||
/* If requested, complete the original type and give it a name. */
|
||
if (is_user_type)
|
||
create_type_decl (get_entity_name (gnat_entity), type,
|
||
NULL, !Comes_From_Source (gnat_entity),
|
||
!(TYPE_NAME (type)
|
||
&& TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
|
||
&& DECL_IGNORED_P (TYPE_NAME (type))),
|
||
gnat_entity);
|
||
|
||
/* We used to modify the record in place in some cases, but that could
|
||
generate incorrect debugging information. So make a new record
|
||
type and name. */
|
||
record = make_node (RECORD_TYPE);
|
||
TYPE_PADDING_P (record) = 1;
|
||
|
||
if (Present (gnat_entity))
|
||
TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD");
|
||
|
||
TYPE_VOLATILE (record)
|
||
= Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
|
||
|
||
TYPE_ALIGN (record) = align;
|
||
TYPE_SIZE (record) = size ? size : orig_size;
|
||
TYPE_SIZE_UNIT (record)
|
||
= convert (sizetype,
|
||
size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
|
||
bitsize_unit_node));
|
||
|
||
/* If we are changing the alignment and the input type is a record with
|
||
BLKmode and a small constant size, try to make a form that has an
|
||
integral mode. This might allow the padding record to also have an
|
||
integral mode, which will be much more efficient. There is no point
|
||
in doing so if a size is specified unless it is also a small constant
|
||
size and it is incorrect to do so if we cannot guarantee that the mode
|
||
will be naturally aligned since the field must always be addressable.
|
||
|
||
??? This might not always be a win when done for a stand-alone object:
|
||
since the nominal and the effective type of the object will now have
|
||
different modes, a VIEW_CONVERT_EXPR will be required for converting
|
||
between them and it might be hard to overcome afterwards, including
|
||
at the RTL level when the stand-alone object is accessed as a whole. */
|
||
if (align != 0
|
||
&& TREE_CODE (type) == RECORD_TYPE
|
||
&& TYPE_MODE (type) == BLKmode
|
||
&& TREE_CODE (orig_size) == INTEGER_CST
|
||
&& !TREE_OVERFLOW (orig_size)
|
||
&& compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
|
||
&& (!size
|
||
|| (TREE_CODE (size) == INTEGER_CST
|
||
&& compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
|
||
{
|
||
tree packable_type = make_packable_type (type, true);
|
||
if (TYPE_MODE (packable_type) != BLKmode
|
||
&& align >= TYPE_ALIGN (packable_type))
|
||
type = packable_type;
|
||
}
|
||
|
||
/* Now create the field with the original size. */
|
||
field = create_field_decl (get_identifier ("F"), type, record, orig_size,
|
||
bitsize_zero_node, 0, 1);
|
||
DECL_INTERNAL_P (field) = 1;
|
||
|
||
/* Do not emit debug info until after the auxiliary record is built. */
|
||
finish_record_type (record, field, 1, false);
|
||
|
||
/* Set the same size for its RM size if requested; otherwise reuse
|
||
the RM size of the original type. */
|
||
SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
|
||
|
||
/* Unless debugging information isn't being written for the input type,
|
||
write a record that shows what we are a subtype of and also make a
|
||
variable that indicates our size, if still variable. */
|
||
if (TREE_CODE (orig_size) != INTEGER_CST
|
||
&& TYPE_NAME (record)
|
||
&& TYPE_NAME (type)
|
||
&& !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
|
||
&& DECL_IGNORED_P (TYPE_NAME (type))))
|
||
{
|
||
tree marker = make_node (RECORD_TYPE);
|
||
tree name = TYPE_NAME (record);
|
||
tree orig_name = TYPE_NAME (type);
|
||
|
||
if (TREE_CODE (name) == TYPE_DECL)
|
||
name = DECL_NAME (name);
|
||
|
||
if (TREE_CODE (orig_name) == TYPE_DECL)
|
||
orig_name = DECL_NAME (orig_name);
|
||
|
||
TYPE_NAME (marker) = concat_name (name, "XVS");
|
||
finish_record_type (marker,
|
||
create_field_decl (orig_name,
|
||
build_reference_type (type),
|
||
marker, NULL_TREE, NULL_TREE,
|
||
0, 0),
|
||
0, true);
|
||
|
||
add_parallel_type (TYPE_STUB_DECL (record), marker);
|
||
|
||
if (definition && size && TREE_CODE (size) != INTEGER_CST)
|
||
TYPE_SIZE_UNIT (marker)
|
||
= create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
|
||
TYPE_SIZE_UNIT (record), false, false, false,
|
||
false, NULL, gnat_entity);
|
||
}
|
||
|
||
rest_of_record_type_compilation (record);
|
||
|
||
/* If the size was widened explicitly, maybe give a warning. Take the
|
||
original size as the maximum size of the input if there was an
|
||
unconstrained record involved and round it up to the specified alignment,
|
||
if one was specified. */
|
||
if (CONTAINS_PLACEHOLDER_P (orig_size))
|
||
orig_size = max_size (orig_size, true);
|
||
|
||
if (align)
|
||
orig_size = round_up (orig_size, align);
|
||
|
||
if (Present (gnat_entity)
|
||
&& size
|
||
&& TREE_CODE (size) != MAX_EXPR
|
||
&& TREE_CODE (size) != COND_EXPR
|
||
&& !operand_equal_p (size, orig_size, 0)
|
||
&& !(TREE_CODE (size) == INTEGER_CST
|
||
&& TREE_CODE (orig_size) == INTEGER_CST
|
||
&& (TREE_OVERFLOW (size)
|
||
|| TREE_OVERFLOW (orig_size)
|
||
|| tree_int_cst_lt (size, orig_size))))
|
||
{
|
||
Node_Id gnat_error_node = Empty;
|
||
|
||
if (Is_Packed_Array_Type (gnat_entity))
|
||
gnat_entity = Original_Array_Type (gnat_entity);
|
||
|
||
if ((Ekind (gnat_entity) == E_Component
|
||
|| Ekind (gnat_entity) == E_Discriminant)
|
||
&& Present (Component_Clause (gnat_entity)))
|
||
gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
|
||
else if (Present (Size_Clause (gnat_entity)))
|
||
gnat_error_node = Expression (Size_Clause (gnat_entity));
|
||
|
||
/* Generate message only for entities that come from source, since
|
||
if we have an entity created by expansion, the message will be
|
||
generated for some other corresponding source entity. */
|
||
if (Comes_From_Source (gnat_entity))
|
||
{
|
||
if (Present (gnat_error_node))
|
||
post_error_ne_tree ("{^ }bits of & unused?",
|
||
gnat_error_node, gnat_entity,
|
||
size_diffop (size, orig_size));
|
||
else if (is_component_type)
|
||
post_error_ne_tree ("component of& padded{ by ^ bits}?",
|
||
gnat_entity, gnat_entity,
|
||
size_diffop (size, orig_size));
|
||
}
|
||
}
|
||
|
||
return record;
|
||
}
|
||
|
||
/* Given a GNU tree and a GNAT list of choices, generate an expression to test
|
||
the value passed against the list of choices. */
|
||
|
||
tree
|
||
choices_to_gnu (tree operand, Node_Id choices)
|
||
{
|
||
Node_Id choice;
|
||
Node_Id gnat_temp;
|
||
tree result = integer_zero_node;
|
||
tree this_test, low = 0, high = 0, single = 0;
|
||
|
||
for (choice = First (choices); Present (choice); choice = Next (choice))
|
||
{
|
||
switch (Nkind (choice))
|
||
{
|
||
case N_Range:
|
||
low = gnat_to_gnu (Low_Bound (choice));
|
||
high = gnat_to_gnu (High_Bound (choice));
|
||
|
||
this_test
|
||
= build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node,
|
||
build_binary_op (GE_EXPR, boolean_type_node,
|
||
operand, low),
|
||
build_binary_op (LE_EXPR, boolean_type_node,
|
||
operand, high));
|
||
|
||
break;
|
||
|
||
case N_Subtype_Indication:
|
||
gnat_temp = Range_Expression (Constraint (choice));
|
||
low = gnat_to_gnu (Low_Bound (gnat_temp));
|
||
high = gnat_to_gnu (High_Bound (gnat_temp));
|
||
|
||
this_test
|
||
= build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node,
|
||
build_binary_op (GE_EXPR, boolean_type_node,
|
||
operand, low),
|
||
build_binary_op (LE_EXPR, boolean_type_node,
|
||
operand, high));
|
||
break;
|
||
|
||
case N_Identifier:
|
||
case N_Expanded_Name:
|
||
/* This represents either a subtype range, an enumeration
|
||
literal, or a constant Ekind says which. If an enumeration
|
||
literal or constant, fall through to the next case. */
|
||
if (Ekind (Entity (choice)) != E_Enumeration_Literal
|
||
&& Ekind (Entity (choice)) != E_Constant)
|
||
{
|
||
tree type = gnat_to_gnu_type (Entity (choice));
|
||
|
||
low = TYPE_MIN_VALUE (type);
|
||
high = TYPE_MAX_VALUE (type);
|
||
|
||
this_test
|
||
= build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node,
|
||
build_binary_op (GE_EXPR, boolean_type_node,
|
||
operand, low),
|
||
build_binary_op (LE_EXPR, boolean_type_node,
|
||
operand, high));
|
||
break;
|
||
}
|
||
|
||
/* ... fall through ... */
|
||
|
||
case N_Character_Literal:
|
||
case N_Integer_Literal:
|
||
single = gnat_to_gnu (choice);
|
||
this_test = build_binary_op (EQ_EXPR, boolean_type_node, operand,
|
||
single);
|
||
break;
|
||
|
||
case N_Others_Choice:
|
||
this_test = integer_one_node;
|
||
break;
|
||
|
||
default:
|
||
gcc_unreachable ();
|
||
}
|
||
|
||
result = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, result,
|
||
this_test);
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
|
||
type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
|
||
|
||
static int
|
||
adjust_packed (tree field_type, tree record_type, int packed)
|
||
{
|
||
/* If the field contains an item of variable size, we cannot pack it
|
||
because we cannot create temporaries of non-fixed size in case
|
||
we need to take the address of the field. See addressable_p and
|
||
the notes on the addressability issues for further details. */
|
||
if (is_variable_size (field_type))
|
||
return 0;
|
||
|
||
/* If the alignment of the record is specified and the field type
|
||
is over-aligned, request Storage_Unit alignment for the field. */
|
||
if (packed == -2)
|
||
{
|
||
if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
|
||
return -1;
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
return packed;
|
||
}
|
||
|
||
/* Return a GCC tree for a field corresponding to GNAT_FIELD to be
|
||
placed in GNU_RECORD_TYPE.
|
||
|
||
PACKED is 1 if the enclosing record is packed, -1 if the enclosing
|
||
record has Component_Alignment of Storage_Unit, -2 if the enclosing
|
||
record has a specified alignment.
|
||
|
||
DEFINITION is true if this field is for a record being defined.
|
||
|
||
DEBUG_INFO_P is true if we need to write debug information for types
|
||
that we may create in the process. */
|
||
|
||
static tree
|
||
gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
|
||
bool definition, bool debug_info_p)
|
||
{
|
||
tree gnu_field_id = get_entity_name (gnat_field);
|
||
tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
|
||
tree gnu_field, gnu_size, gnu_pos;
|
||
bool needs_strict_alignment
|
||
= (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
|
||
|| Treat_As_Volatile (gnat_field));
|
||
|
||
/* If this field requires strict alignment, we cannot pack it because
|
||
it would very likely be under-aligned in the record. */
|
||
if (needs_strict_alignment)
|
||
packed = 0;
|
||
else
|
||
packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
|
||
|
||
/* If a size is specified, use it. Otherwise, if the record type is packed,
|
||
use the official RM size. See "Handling of Type'Size Values" in Einfo
|
||
for further details. */
|
||
if (Known_Static_Esize (gnat_field))
|
||
gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
|
||
gnat_field, FIELD_DECL, false, true);
|
||
else if (packed == 1)
|
||
gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
|
||
gnat_field, FIELD_DECL, false, true);
|
||
else
|
||
gnu_size = NULL_TREE;
|
||
|
||
/* If we have a specified size that is smaller than that of the field's type,
|
||
or a position is specified, and the field's type is a record that doesn't
|
||
require strict alignment, see if we can get either an integral mode form
|
||
of the type or a smaller form. If we can, show a size was specified for
|
||
the field if there wasn't one already, so we know to make this a bitfield
|
||
and avoid making things wider.
|
||
|
||
Changing to an integral mode form is useful when the record is packed as
|
||
we can then place the field at a non-byte-aligned position and so achieve
|
||
tighter packing. This is in addition required if the field shares a byte
|
||
with another field and the front-end lets the back-end handle the access
|
||
to the field, because GCC cannot handle non-byte-aligned BLKmode fields.
|
||
|
||
Changing to a smaller form is required if the specified size is smaller
|
||
than that of the field's type and the type contains sub-fields that are
|
||
padded, in order to avoid generating accesses to these sub-fields that
|
||
are wider than the field.
|
||
|
||
We avoid the transformation if it is not required or potentially useful,
|
||
as it might entail an increase of the field's alignment and have ripple
|
||
effects on the outer record type. A typical case is a field known to be
|
||
byte-aligned and not to share a byte with another field. */
|
||
if (!needs_strict_alignment
|
||
&& TREE_CODE (gnu_field_type) == RECORD_TYPE
|
||
&& !TYPE_FAT_POINTER_P (gnu_field_type)
|
||
&& host_integerp (TYPE_SIZE (gnu_field_type), 1)
|
||
&& (packed == 1
|
||
|| (gnu_size
|
||
&& (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
|
||
|| (Present (Component_Clause (gnat_field))
|
||
&& !(UI_To_Int (Component_Bit_Offset (gnat_field))
|
||
% BITS_PER_UNIT == 0
|
||
&& value_factor_p (gnu_size, BITS_PER_UNIT)))))))
|
||
{
|
||
tree gnu_packable_type = make_packable_type (gnu_field_type, true);
|
||
if (gnu_packable_type != gnu_field_type)
|
||
{
|
||
gnu_field_type = gnu_packable_type;
|
||
if (!gnu_size)
|
||
gnu_size = rm_size (gnu_field_type);
|
||
}
|
||
}
|
||
|
||
/* If we are packing the record and the field is BLKmode, round the
|
||
size up to a byte boundary. */
|
||
if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
|
||
gnu_size = round_up (gnu_size, BITS_PER_UNIT);
|
||
|
||
if (Present (Component_Clause (gnat_field)))
|
||
{
|
||
Entity_Id gnat_parent
|
||
= Parent_Subtype (Underlying_Type (Scope (gnat_field)));
|
||
|
||
gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
|
||
gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
|
||
gnat_field, FIELD_DECL, false, true);
|
||
|
||
/* Ensure the position does not overlap with the parent subtype, if there
|
||
is one. This test is omitted if the parent of the tagged type has a
|
||
full rep clause since, in this case, component clauses are allowed to
|
||
overlay the space allocated for the parent type and the front-end has
|
||
checked that there are no overlapping components. */
|
||
if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent))
|
||
{
|
||
tree gnu_parent = gnat_to_gnu_type (gnat_parent);
|
||
|
||
if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
|
||
&& tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
|
||
{
|
||
post_error_ne_tree
|
||
("offset of& must be beyond parent{, minimum allowed is ^}",
|
||
First_Bit (Component_Clause (gnat_field)), gnat_field,
|
||
TYPE_SIZE_UNIT (gnu_parent));
|
||
}
|
||
}
|
||
|
||
/* If this field needs strict alignment, ensure the record is
|
||
sufficiently aligned and that that position and size are
|
||
consistent with the alignment. */
|
||
if (needs_strict_alignment)
|
||
{
|
||
TYPE_ALIGN (gnu_record_type)
|
||
= MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
|
||
|
||
if (gnu_size
|
||
&& !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
|
||
{
|
||
if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
|
||
post_error_ne_tree
|
||
("atomic field& must be natural size of type{ (^)}",
|
||
Last_Bit (Component_Clause (gnat_field)), gnat_field,
|
||
TYPE_SIZE (gnu_field_type));
|
||
|
||
else if (Is_Aliased (gnat_field))
|
||
post_error_ne_tree
|
||
("size of aliased field& must be ^ bits",
|
||
Last_Bit (Component_Clause (gnat_field)), gnat_field,
|
||
TYPE_SIZE (gnu_field_type));
|
||
|
||
else if (Strict_Alignment (Etype (gnat_field)))
|
||
post_error_ne_tree
|
||
("size of & with aliased or tagged components not ^ bits",
|
||
Last_Bit (Component_Clause (gnat_field)), gnat_field,
|
||
TYPE_SIZE (gnu_field_type));
|
||
|
||
gnu_size = NULL_TREE;
|
||
}
|
||
|
||
if (!integer_zerop (size_binop
|
||
(TRUNC_MOD_EXPR, gnu_pos,
|
||
bitsize_int (TYPE_ALIGN (gnu_field_type)))))
|
||
{
|
||
if (Is_Aliased (gnat_field))
|
||
post_error_ne_num
|
||
("position of aliased field& must be multiple of ^ bits",
|
||
First_Bit (Component_Clause (gnat_field)), gnat_field,
|
||
TYPE_ALIGN (gnu_field_type));
|
||
|
||
else if (Treat_As_Volatile (gnat_field))
|
||
post_error_ne_num
|
||
("position of volatile field& must be multiple of ^ bits",
|
||
First_Bit (Component_Clause (gnat_field)), gnat_field,
|
||
TYPE_ALIGN (gnu_field_type));
|
||
|
||
else if (Strict_Alignment (Etype (gnat_field)))
|
||
post_error_ne_num
|
||
("position of & with aliased or tagged components not multiple of ^ bits",
|
||
First_Bit (Component_Clause (gnat_field)), gnat_field,
|
||
TYPE_ALIGN (gnu_field_type));
|
||
|
||
else
|
||
gcc_unreachable ();
|
||
|
||
gnu_pos = NULL_TREE;
|
||
}
|
||
}
|
||
|
||
if (Is_Atomic (gnat_field))
|
||
check_ok_for_atomic (gnu_field_type, gnat_field, false);
|
||
}
|
||
|
||
/* If the record has rep clauses and this is the tag field, make a rep
|
||
clause for it as well. */
|
||
else if (Has_Specified_Layout (Scope (gnat_field))
|
||
&& Chars (gnat_field) == Name_uTag)
|
||
{
|
||
gnu_pos = bitsize_zero_node;
|
||
gnu_size = TYPE_SIZE (gnu_field_type);
|
||
}
|
||
|
||
else
|
||
gnu_pos = NULL_TREE;
|
||
|
||
/* We need to make the size the maximum for the type if it is
|
||
self-referential and an unconstrained type. In that case, we can't
|
||
pack the field since we can't make a copy to align it. */
|
||
if (TREE_CODE (gnu_field_type) == RECORD_TYPE
|
||
&& !gnu_size
|
||
&& CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
|
||
&& !Is_Constrained (Underlying_Type (Etype (gnat_field))))
|
||
{
|
||
gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
|
||
packed = 0;
|
||
}
|
||
|
||
/* If a size is specified, adjust the field's type to it. */
|
||
if (gnu_size)
|
||
{
|
||
tree orig_field_type;
|
||
|
||
/* If the field's type is justified modular, we would need to remove
|
||
the wrapper to (better) meet the layout requirements. However we
|
||
can do so only if the field is not aliased to preserve the unique
|
||
layout and if the prescribed size is not greater than that of the
|
||
packed array to preserve the justification. */
|
||
if (!needs_strict_alignment
|
||
&& TREE_CODE (gnu_field_type) == RECORD_TYPE
|
||
&& TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
|
||
&& tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
|
||
<= 0)
|
||
gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
|
||
|
||
gnu_field_type
|
||
= make_type_from_size (gnu_field_type, gnu_size,
|
||
Has_Biased_Representation (gnat_field));
|
||
|
||
orig_field_type = gnu_field_type;
|
||
gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
|
||
false, false, definition, true);
|
||
|
||
/* If a padding record was made, declare it now since it will never be
|
||
declared otherwise. This is necessary to ensure that its subtrees
|
||
are properly marked. */
|
||
if (gnu_field_type != orig_field_type
|
||
&& !DECL_P (TYPE_NAME (gnu_field_type)))
|
||
create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, NULL,
|
||
true, debug_info_p, gnat_field);
|
||
}
|
||
|
||
/* Otherwise (or if there was an error), don't specify a position. */
|
||
else
|
||
gnu_pos = NULL_TREE;
|
||
|
||
gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
|
||
|| !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
|
||
|
||
/* Now create the decl for the field. */
|
||
gnu_field
|
||
= create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
|
||
gnu_size, gnu_pos, packed, Is_Aliased (gnat_field));
|
||
Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
|
||
TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
|
||
|
||
if (Ekind (gnat_field) == E_Discriminant)
|
||
DECL_DISCRIMINANT_NUMBER (gnu_field)
|
||
= UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
|
||
|
||
return gnu_field;
|
||
}
|
||
|
||
/* Return true if TYPE is a type with variable size, a padding type with a
|
||
field of variable size or is a record that has a field such a field. */
|
||
|
||
static bool
|
||
is_variable_size (tree type)
|
||
{
|
||
tree field;
|
||
|
||
if (!TREE_CONSTANT (TYPE_SIZE (type)))
|
||
return true;
|
||
|
||
if (TYPE_IS_PADDING_P (type)
|
||
&& !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
|
||
return true;
|
||
|
||
if (TREE_CODE (type) != RECORD_TYPE
|
||
&& TREE_CODE (type) != UNION_TYPE
|
||
&& TREE_CODE (type) != QUAL_UNION_TYPE)
|
||
return false;
|
||
|
||
for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
|
||
if (is_variable_size (TREE_TYPE (field)))
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
/* qsort comparer for the bit positions of two record components. */
|
||
|
||
static int
|
||
compare_field_bitpos (const PTR rt1, const PTR rt2)
|
||
{
|
||
const_tree const field1 = * (const_tree const *) rt1;
|
||
const_tree const field2 = * (const_tree const *) rt2;
|
||
const int ret
|
||
= tree_int_cst_compare (bit_position (field1), bit_position (field2));
|
||
|
||
return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
|
||
}
|
||
|
||
/* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set
|
||
the result as the field list of GNU_RECORD_TYPE and finish it up. When
|
||
called from gnat_to_gnu_entity during the processing of a record type
|
||
definition, the GCC node for the parent, if any, will be the single field
|
||
of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the
|
||
GNU_FIELD_LIST. The other calls to this function are recursive calls for
|
||
the component list of a variant and, in this case, GNU_FIELD_LIST is empty.
|
||
|
||
PACKED is 1 if this is for a packed record, -1 if this is for a record
|
||
with Component_Alignment of Storage_Unit, -2 if this is for a record
|
||
with a specified alignment.
|
||
|
||
DEFINITION is true if we are defining this record type.
|
||
|
||
P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
|
||
with a rep clause is to be added; in this case, that is all that should
|
||
be done with such fields.
|
||
|
||
CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying
|
||
out the record. This means the alignment only serves to force fields to
|
||
be bitfields, but not to require the record to be that aligned. This is
|
||
used for variants.
|
||
|
||
ALL_REP is true if a rep clause is present for all the fields.
|
||
|
||
UNCHECKED_UNION is true if we are building this type for a record with a
|
||
Pragma Unchecked_Union.
|
||
|
||
DEBUG_INFO_P is true if we need to write debug information about the type.
|
||
|
||
MAYBE_UNUSED is true if this type may be unused in the end; this doesn't
|
||
mean that its contents may be unused as well, but only the container. */
|
||
|
||
|
||
static void
|
||
components_to_record (tree gnu_record_type, Node_Id gnat_component_list,
|
||
tree gnu_field_list, int packed, bool definition,
|
||
tree *p_gnu_rep_list, bool cancel_alignment,
|
||
bool all_rep, bool unchecked_union, bool debug_info_p,
|
||
bool maybe_unused)
|
||
{
|
||
bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
|
||
bool layout_with_rep = false;
|
||
Node_Id component_decl, variant_part;
|
||
tree gnu_our_rep_list = NULL_TREE;
|
||
tree gnu_field, gnu_next, gnu_last = tree_last (gnu_field_list);
|
||
|
||
/* For each component referenced in a component declaration create a GCC
|
||
field and add it to the list, skipping pragmas in the GNAT list. */
|
||
if (Present (Component_Items (gnat_component_list)))
|
||
for (component_decl
|
||
= First_Non_Pragma (Component_Items (gnat_component_list));
|
||
Present (component_decl);
|
||
component_decl = Next_Non_Pragma (component_decl))
|
||
{
|
||
Entity_Id gnat_field = Defining_Entity (component_decl);
|
||
Name_Id gnat_name = Chars (gnat_field);
|
||
|
||
/* If present, the _Parent field must have been created as the single
|
||
field of the record type. Put it before any other fields. */
|
||
if (gnat_name == Name_uParent)
|
||
{
|
||
gnu_field = TYPE_FIELDS (gnu_record_type);
|
||
gnu_field_list = chainon (gnu_field_list, gnu_field);
|
||
}
|
||
else
|
||
{
|
||
gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed,
|
||
definition, debug_info_p);
|
||
|
||
/* If this is the _Tag field, put it before any other fields. */
|
||
if (gnat_name == Name_uTag)
|
||
gnu_field_list = chainon (gnu_field_list, gnu_field);
|
||
|
||
/* If this is the _Controller field, put it before the other
|
||
fields except for the _Tag or _Parent field. */
|
||
else if (gnat_name == Name_uController && gnu_last)
|
||
{
|
||
TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
|
||
TREE_CHAIN (gnu_last) = gnu_field;
|
||
}
|
||
|
||
/* If this is a regular field, put it after the other fields. */
|
||
else
|
||
{
|
||
TREE_CHAIN (gnu_field) = gnu_field_list;
|
||
gnu_field_list = gnu_field;
|
||
if (!gnu_last)
|
||
gnu_last = gnu_field;
|
||
}
|
||
}
|
||
|
||
save_gnu_tree (gnat_field, gnu_field, false);
|
||
}
|
||
|
||
/* At the end of the component list there may be a variant part. */
|
||
variant_part = Variant_Part (gnat_component_list);
|
||
|
||
/* We create a QUAL_UNION_TYPE for the variant part since the variants are
|
||
mutually exclusive and should go in the same memory. To do this we need
|
||
to treat each variant as a record whose elements are created from the
|
||
component list for the variant. So here we create the records from the
|
||
lists for the variants and put them all into the QUAL_UNION_TYPE.
|
||
If this is an Unchecked_Union, we make a UNION_TYPE instead or
|
||
use GNU_RECORD_TYPE if there are no fields so far. */
|
||
if (Present (variant_part))
|
||
{
|
||
Node_Id gnat_discr = Name (variant_part), variant;
|
||
tree gnu_discr = gnat_to_gnu (gnat_discr);
|
||
tree gnu_name = TYPE_NAME (gnu_record_type);
|
||
tree gnu_var_name
|
||
= concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
|
||
"XVN");
|
||
tree gnu_union_type, gnu_union_name, gnu_union_field;
|
||
tree gnu_variant_list = NULL_TREE;
|
||
|
||
if (TREE_CODE (gnu_name) == TYPE_DECL)
|
||
gnu_name = DECL_NAME (gnu_name);
|
||
|
||
gnu_union_name
|
||
= concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
|
||
|
||
/* Reuse an enclosing union if all fields are in the variant part
|
||
and there is no representation clause on the record, to match
|
||
the layout of C unions. There is an associated check below. */
|
||
if (!gnu_field_list
|
||
&& TREE_CODE (gnu_record_type) == UNION_TYPE
|
||
&& !TYPE_PACKED (gnu_record_type))
|
||
gnu_union_type = gnu_record_type;
|
||
else
|
||
{
|
||
gnu_union_type
|
||
= make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
|
||
|
||
TYPE_NAME (gnu_union_type) = gnu_union_name;
|
||
TYPE_ALIGN (gnu_union_type) = 0;
|
||
TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
|
||
}
|
||
|
||
for (variant = First_Non_Pragma (Variants (variant_part));
|
||
Present (variant);
|
||
variant = Next_Non_Pragma (variant))
|
||
{
|
||
tree gnu_variant_type = make_node (RECORD_TYPE);
|
||
tree gnu_inner_name;
|
||
tree gnu_qual;
|
||
|
||
Get_Variant_Encoding (variant);
|
||
gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
|
||
TYPE_NAME (gnu_variant_type)
|
||
= concat_name (gnu_union_name,
|
||
IDENTIFIER_POINTER (gnu_inner_name));
|
||
|
||
/* Set the alignment of the inner type in case we need to make
|
||
inner objects into bitfields, but then clear it out so the
|
||
record actually gets only the alignment required. */
|
||
TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
|
||
TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
|
||
|
||
/* Similarly, if the outer record has a size specified and all
|
||
fields have record rep clauses, we can propagate the size
|
||
into the variant part. */
|
||
if (all_rep_and_size)
|
||
{
|
||
TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
|
||
TYPE_SIZE_UNIT (gnu_variant_type)
|
||
= TYPE_SIZE_UNIT (gnu_record_type);
|
||
}
|
||
|
||
/* Add the fields into the record type for the variant. Note that
|
||
we aren't sure to really use it at this point, see below. */
|
||
components_to_record (gnu_variant_type, Component_List (variant),
|
||
NULL_TREE, packed, definition,
|
||
&gnu_our_rep_list, !all_rep_and_size, all_rep,
|
||
unchecked_union, debug_info_p, true);
|
||
|
||
gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
|
||
|
||
Set_Present_Expr (variant, annotate_value (gnu_qual));
|
||
|
||
/* If this is an Unchecked_Union and we have exactly one field,
|
||
use this field directly to match the layout of C unions. */
|
||
if (unchecked_union
|
||
&& TYPE_FIELDS (gnu_variant_type)
|
||
&& !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
|
||
gnu_field = TYPE_FIELDS (gnu_variant_type);
|
||
else
|
||
{
|
||
/* Deal with packedness like in gnat_to_gnu_field. */
|
||
int field_packed
|
||
= adjust_packed (gnu_variant_type, gnu_record_type, packed);
|
||
|
||
/* Finalize the record type now. We used to throw away
|
||
empty records but we no longer do that because we need
|
||
them to generate complete debug info for the variant;
|
||
otherwise, the union type definition will be lacking
|
||
the fields associated with these empty variants. */
|
||
rest_of_record_type_compilation (gnu_variant_type);
|
||
create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type,
|
||
NULL, true, debug_info_p, gnat_component_list);
|
||
|
||
gnu_field
|
||
= create_field_decl (gnu_inner_name, gnu_variant_type,
|
||
gnu_union_type,
|
||
all_rep_and_size
|
||
? TYPE_SIZE (gnu_variant_type) : 0,
|
||
all_rep_and_size
|
||
? bitsize_zero_node : 0,
|
||
field_packed, 0);
|
||
|
||
DECL_INTERNAL_P (gnu_field) = 1;
|
||
|
||
if (!unchecked_union)
|
||
DECL_QUALIFIER (gnu_field) = gnu_qual;
|
||
}
|
||
|
||
TREE_CHAIN (gnu_field) = gnu_variant_list;
|
||
gnu_variant_list = gnu_field;
|
||
}
|
||
|
||
/* Only make the QUAL_UNION_TYPE if there are non-empty variants. */
|
||
if (gnu_variant_list)
|
||
{
|
||
int union_field_packed;
|
||
|
||
if (all_rep_and_size)
|
||
{
|
||
TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
|
||
TYPE_SIZE_UNIT (gnu_union_type)
|
||
= TYPE_SIZE_UNIT (gnu_record_type);
|
||
}
|
||
|
||
finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
|
||
all_rep_and_size ? 1 : 0, debug_info_p);
|
||
|
||
/* If GNU_UNION_TYPE is our record type, it means we must have an
|
||
Unchecked_Union with no fields. Verify that and, if so, just
|
||
return. */
|
||
if (gnu_union_type == gnu_record_type)
|
||
{
|
||
gcc_assert (unchecked_union
|
||
&& !gnu_field_list
|
||
&& !gnu_our_rep_list);
|
||
return;
|
||
}
|
||
|
||
create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type,
|
||
NULL, true, debug_info_p, gnat_component_list);
|
||
|
||
/* Deal with packedness like in gnat_to_gnu_field. */
|
||
union_field_packed
|
||
= adjust_packed (gnu_union_type, gnu_record_type, packed);
|
||
|
||
gnu_union_field
|
||
= create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
|
||
all_rep ? TYPE_SIZE (gnu_union_type) : 0,
|
||
all_rep ? bitsize_zero_node : 0,
|
||
union_field_packed, 0);
|
||
|
||
DECL_INTERNAL_P (gnu_union_field) = 1;
|
||
TREE_CHAIN (gnu_union_field) = gnu_field_list;
|
||
gnu_field_list = gnu_union_field;
|
||
}
|
||
}
|
||
|
||
/* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
|
||
do, pull them out and put them into GNU_OUR_REP_LIST. We have to do
|
||
this in a separate pass since we want to handle the discriminants but
|
||
can't play with them until we've used them in debugging data above.
|
||
|
||
??? If we then reorder them, debugging information will be wrong but
|
||
there's nothing that can be done about this at the moment. */
|
||
gnu_last = NULL_TREE;
|
||
for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next)
|
||
{
|
||
gnu_next = TREE_CHAIN (gnu_field);
|
||
|
||
if (DECL_FIELD_OFFSET (gnu_field))
|
||
{
|
||
if (!gnu_last)
|
||
gnu_field_list = gnu_next;
|
||
else
|
||
TREE_CHAIN (gnu_last) = gnu_next;
|
||
|
||
TREE_CHAIN (gnu_field) = gnu_our_rep_list;
|
||
gnu_our_rep_list = gnu_field;
|
||
}
|
||
else
|
||
gnu_last = gnu_field;
|
||
}
|
||
|
||
/* If we have any fields in our rep'ed field list and it is not the case that
|
||
all the fields in the record have rep clauses and P_REP_LIST is nonzero,
|
||
set it and ignore these fields. */
|
||
if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
|
||
*p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
|
||
|
||
/* Otherwise, sort the fields by bit position and put them into their own
|
||
record, before the others, if we also have fields without rep clauses. */
|
||
else if (gnu_our_rep_list)
|
||
{
|
||
tree gnu_rep_type
|
||
= (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
|
||
int i, len = list_length (gnu_our_rep_list);
|
||
tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
|
||
|
||
for (gnu_field = gnu_our_rep_list, i = 0;
|
||
gnu_field;
|
||
gnu_field = TREE_CHAIN (gnu_field), i++)
|
||
gnu_arr[i] = gnu_field;
|
||
|
||
qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
|
||
|
||
/* Put the fields in the list in order of increasing position, which
|
||
means we start from the end. */
|
||
gnu_our_rep_list = NULL_TREE;
|
||
for (i = len - 1; i >= 0; i--)
|
||
{
|
||
TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
|
||
gnu_our_rep_list = gnu_arr[i];
|
||
DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
|
||
}
|
||
|
||
if (gnu_field_list)
|
||
{
|
||
finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, debug_info_p);
|
||
gnu_field
|
||
= create_field_decl (get_identifier ("REP"), gnu_rep_type,
|
||
gnu_record_type, NULL_TREE, NULL_TREE, 0, 1);
|
||
DECL_INTERNAL_P (gnu_field) = 1;
|
||
gnu_field_list = chainon (gnu_field_list, gnu_field);
|
||
}
|
||
else
|
||
{
|
||
layout_with_rep = true;
|
||
gnu_field_list = nreverse (gnu_our_rep_list);
|
||
}
|
||
}
|
||
|
||
if (cancel_alignment)
|
||
TYPE_ALIGN (gnu_record_type) = 0;
|
||
|
||
finish_record_type (gnu_record_type, nreverse (gnu_field_list),
|
||
layout_with_rep ? 1 : 0, debug_info_p && !maybe_unused);
|
||
}
|
||
|
||
/* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
|
||
placed into an Esize, Component_Bit_Offset, or Component_Size value
|
||
in the GNAT tree. */
|
||
|
||
static Uint
|
||
annotate_value (tree gnu_size)
|
||
{
|
||
TCode tcode;
|
||
Node_Ref_Or_Val ops[3], ret;
|
||
struct tree_int_map **h = NULL;
|
||
int i;
|
||
|
||
/* See if we've already saved the value for this node. */
|
||
if (EXPR_P (gnu_size))
|
||
{
|
||
struct tree_int_map in;
|
||
if (!annotate_value_cache)
|
||
annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
|
||
tree_int_map_eq, 0);
|
||
in.base.from = gnu_size;
|
||
h = (struct tree_int_map **)
|
||
htab_find_slot (annotate_value_cache, &in, INSERT);
|
||
|
||
if (*h)
|
||
return (Node_Ref_Or_Val) (*h)->to;
|
||
}
|
||
|
||
/* If we do not return inside this switch, TCODE will be set to the
|
||
code to use for a Create_Node operand and LEN (set above) will be
|
||
the number of recursive calls for us to make. */
|
||
|
||
switch (TREE_CODE (gnu_size))
|
||
{
|
||
case INTEGER_CST:
|
||
if (TREE_OVERFLOW (gnu_size))
|
||
return No_Uint;
|
||
|
||
/* This may come from a conversion from some smaller type, so ensure
|
||
this is in bitsizetype. */
|
||
gnu_size = convert (bitsizetype, gnu_size);
|
||
|
||
/* For a negative value, build NEGATE_EXPR of the opposite. Such values
|
||
appear in expressions containing aligning patterns. Note that, since
|
||
sizetype is sign-extended but nonetheless unsigned, we don't directly
|
||
use tree_int_cst_sgn. */
|
||
if (TREE_INT_CST_HIGH (gnu_size) < 0)
|
||
{
|
||
tree op_size = fold_build1 (NEGATE_EXPR, bitsizetype, gnu_size);
|
||
return annotate_value (build1 (NEGATE_EXPR, bitsizetype, op_size));
|
||
}
|
||
|
||
return UI_From_gnu (gnu_size);
|
||
|
||
case COMPONENT_REF:
|
||
/* The only case we handle here is a simple discriminant reference. */
|
||
if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
|
||
&& TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
|
||
&& DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
|
||
return Create_Node (Discrim_Val,
|
||
annotate_value (DECL_DISCRIMINANT_NUMBER
|
||
(TREE_OPERAND (gnu_size, 1))),
|
||
No_Uint, No_Uint);
|
||
else
|
||
return No_Uint;
|
||
|
||
CASE_CONVERT: case NON_LVALUE_EXPR:
|
||
return annotate_value (TREE_OPERAND (gnu_size, 0));
|
||
|
||
/* Now just list the operations we handle. */
|
||
case COND_EXPR: tcode = Cond_Expr; break;
|
||
case PLUS_EXPR: tcode = Plus_Expr; break;
|
||
case MINUS_EXPR: tcode = Minus_Expr; break;
|
||
case MULT_EXPR: tcode = Mult_Expr; break;
|
||
case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
|
||
case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
|
||
case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
|
||
case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
|
||
case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
|
||
case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
|
||
case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
|
||
case NEGATE_EXPR: tcode = Negate_Expr; break;
|
||
case MIN_EXPR: tcode = Min_Expr; break;
|
||
case MAX_EXPR: tcode = Max_Expr; break;
|
||
case ABS_EXPR: tcode = Abs_Expr; break;
|
||
case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
|
||
case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
|
||
case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
|
||
case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
|
||
case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
|
||
case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
|
||
case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
|
||
case LT_EXPR: tcode = Lt_Expr; break;
|
||
case LE_EXPR: tcode = Le_Expr; break;
|
||
case GT_EXPR: tcode = Gt_Expr; break;
|
||
case GE_EXPR: tcode = Ge_Expr; break;
|
||
case EQ_EXPR: tcode = Eq_Expr; break;
|
||
case NE_EXPR: tcode = Ne_Expr; break;
|
||
|
||
case CALL_EXPR:
|
||
{
|
||
tree t = maybe_inline_call_in_expr (gnu_size);
|
||
if (t)
|
||
return annotate_value (t);
|
||
}
|
||
|
||
/* Fall through... */
|
||
|
||
default:
|
||
return No_Uint;
|
||
}
|
||
|
||
/* Now get each of the operands that's relevant for this code. If any
|
||
cannot be expressed as a repinfo node, say we can't. */
|
||
for (i = 0; i < 3; i++)
|
||
ops[i] = No_Uint;
|
||
|
||
for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (gnu_size)); i++)
|
||
{
|
||
ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
|
||
if (ops[i] == No_Uint)
|
||
return No_Uint;
|
||
}
|
||
|
||
ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
|
||
|
||
/* Save the result in the cache. */
|
||
if (h)
|
||
{
|
||
*h = GGC_NEW (struct tree_int_map);
|
||
(*h)->base.from = gnu_size;
|
||
(*h)->to = ret;
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Given GNAT_ENTITY, an object (constant, variable, parameter, exception)
|
||
and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the
|
||
size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null.
|
||
BY_REF is true if the object is used by reference. */
|
||
|
||
void
|
||
annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref)
|
||
{
|
||
if (by_ref)
|
||
{
|
||
if (TYPE_IS_FAT_POINTER_P (gnu_type))
|
||
gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type);
|
||
else
|
||
gnu_type = TREE_TYPE (gnu_type);
|
||
}
|
||
|
||
if (Unknown_Esize (gnat_entity))
|
||
{
|
||
if (TREE_CODE (gnu_type) == RECORD_TYPE
|
||
&& TYPE_CONTAINS_TEMPLATE_P (gnu_type))
|
||
size = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
|
||
else if (!size)
|
||
size = TYPE_SIZE (gnu_type);
|
||
|
||
if (size)
|
||
Set_Esize (gnat_entity, annotate_value (size));
|
||
}
|
||
|
||
if (Unknown_Alignment (gnat_entity))
|
||
Set_Alignment (gnat_entity,
|
||
UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
|
||
}
|
||
|
||
/* Return first element of field list whose TREE_PURPOSE is the same as ELEM.
|
||
Return NULL_TREE if there is no such element in the list. */
|
||
|
||
static tree
|
||
purpose_member_field (const_tree elem, tree list)
|
||
{
|
||
while (list)
|
||
{
|
||
tree field = TREE_PURPOSE (list);
|
||
if (SAME_FIELD_P (field, elem))
|
||
return list;
|
||
list = TREE_CHAIN (list);
|
||
}
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type,
|
||
set Component_Bit_Offset and Esize of the components to the position and
|
||
size used by Gigi. */
|
||
|
||
static void
|
||
annotate_rep (Entity_Id gnat_entity, tree gnu_type)
|
||
{
|
||
Entity_Id gnat_field;
|
||
tree gnu_list;
|
||
|
||
/* We operate by first making a list of all fields and their position (we
|
||
can get the size easily) and then update all the sizes in the tree. */
|
||
gnu_list
|
||
= build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node,
|
||
BIGGEST_ALIGNMENT, NULL_TREE);
|
||
|
||
for (gnat_field = First_Entity (gnat_entity);
|
||
Present (gnat_field);
|
||
gnat_field = Next_Entity (gnat_field))
|
||
if (Ekind (gnat_field) == E_Component
|
||
|| (Ekind (gnat_field) == E_Discriminant
|
||
&& !Is_Unchecked_Union (Scope (gnat_field))))
|
||
{
|
||
tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field),
|
||
gnu_list);
|
||
if (t)
|
||
{
|
||
tree parent_offset;
|
||
|
||
if (type_annotate_only && Is_Tagged_Type (gnat_entity))
|
||
{
|
||
/* In this mode the tag and parent components are not
|
||
generated, so we add the appropriate offset to each
|
||
component. For a component appearing in the current
|
||
extension, the offset is the size of the parent. */
|
||
if (Is_Derived_Type (gnat_entity)
|
||
&& Original_Record_Component (gnat_field) == gnat_field)
|
||
parent_offset
|
||
= UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
|
||
bitsizetype);
|
||
else
|
||
parent_offset = bitsize_int (POINTER_SIZE);
|
||
}
|
||
else
|
||
parent_offset = bitsize_zero_node;
|
||
|
||
Set_Component_Bit_Offset
|
||
(gnat_field,
|
||
annotate_value
|
||
(size_binop (PLUS_EXPR,
|
||
bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0),
|
||
TREE_VEC_ELT (TREE_VALUE (t), 2)),
|
||
parent_offset)));
|
||
|
||
Set_Esize (gnat_field,
|
||
annotate_value (DECL_SIZE (TREE_PURPOSE (t))));
|
||
}
|
||
else if (Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity))
|
||
{
|
||
/* If there is no entry, this is an inherited component whose
|
||
position is the same as in the parent type. */
|
||
Set_Component_Bit_Offset
|
||
(gnat_field,
|
||
Component_Bit_Offset (Original_Record_Component (gnat_field)));
|
||
|
||
Set_Esize (gnat_field,
|
||
Esize (Original_Record_Component (gnat_field)));
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is
|
||
the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the
|
||
value to be placed into DECL_OFFSET_ALIGN and the bit position. The list
|
||
of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT
|
||
is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the
|
||
bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a
|
||
pre-existing list to be chained to the newly created entries. */
|
||
|
||
static tree
|
||
build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos,
|
||
tree gnu_bitpos, unsigned int offset_align, tree gnu_list)
|
||
{
|
||
tree gnu_field;
|
||
|
||
for (gnu_field = TYPE_FIELDS (gnu_type);
|
||
gnu_field;
|
||
gnu_field = TREE_CHAIN (gnu_field))
|
||
{
|
||
tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
|
||
DECL_FIELD_BIT_OFFSET (gnu_field));
|
||
tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
|
||
DECL_FIELD_OFFSET (gnu_field));
|
||
unsigned int our_offset_align
|
||
= MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
|
||
tree v = make_tree_vec (3);
|
||
|
||
TREE_VEC_ELT (v, 0) = gnu_our_offset;
|
||
TREE_VEC_ELT (v, 1) = size_int (our_offset_align);
|
||
TREE_VEC_ELT (v, 2) = gnu_our_bitpos;
|
||
gnu_list = tree_cons (gnu_field, v, gnu_list);
|
||
|
||
/* Recurse on internal fields, flattening the nested fields except for
|
||
those in the variant part, if requested. */
|
||
if (DECL_INTERNAL_P (gnu_field))
|
||
{
|
||
tree gnu_field_type = TREE_TYPE (gnu_field);
|
||
if (do_not_flatten_variant
|
||
&& TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE)
|
||
gnu_list
|
||
= build_position_list (gnu_field_type, do_not_flatten_variant,
|
||
size_zero_node, bitsize_zero_node,
|
||
BIGGEST_ALIGNMENT, gnu_list);
|
||
else
|
||
gnu_list
|
||
= build_position_list (gnu_field_type, do_not_flatten_variant,
|
||
gnu_our_offset, gnu_our_bitpos,
|
||
our_offset_align, gnu_list);
|
||
}
|
||
}
|
||
|
||
return gnu_list;
|
||
}
|
||
|
||
/* Return a TREE_LIST describing the substitutions needed to reflect the
|
||
discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can
|
||
be in any order. TREE_PURPOSE gives the tree for the discriminant and
|
||
TREE_VALUE is the replacement value. They are in the form of operands
|
||
to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for a definition
|
||
of GNAT_SUBTYPE. */
|
||
|
||
static tree
|
||
build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition)
|
||
{
|
||
tree gnu_list = NULL_TREE;
|
||
Entity_Id gnat_discrim;
|
||
Node_Id gnat_value;
|
||
|
||
for (gnat_discrim = First_Stored_Discriminant (gnat_type),
|
||
gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
|
||
Present (gnat_discrim);
|
||
gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
|
||
gnat_value = Next_Elmt (gnat_value))
|
||
/* Ignore access discriminants. */
|
||
if (!Is_Access_Type (Etype (Node (gnat_value))))
|
||
{
|
||
tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim);
|
||
gnu_list = tree_cons (gnu_field,
|
||
convert (TREE_TYPE (gnu_field),
|
||
elaborate_expression
|
||
(Node (gnat_value), gnat_subtype,
|
||
get_entity_name (gnat_discrim),
|
||
definition, true, false)),
|
||
gnu_list);
|
||
}
|
||
|
||
return gnu_list;
|
||
}
|
||
|
||
/* Scan all fields in QUAL_UNION_TYPE and return a TREE_LIST describing the
|
||
variants of QUAL_UNION_TYPE that are still relevant after applying the
|
||
substitutions described in SUBST_LIST. TREE_PURPOSE is the type of the
|
||
variant and TREE_VALUE is a TREE_VEC containing the field, the new value
|
||
of the qualifier and NULL_TREE respectively. GNU_LIST is a pre-existing
|
||
list to be chained to the newly created entries. */
|
||
|
||
static tree
|
||
build_variant_list (tree qual_union_type, tree subst_list, tree gnu_list)
|
||
{
|
||
tree gnu_field;
|
||
|
||
for (gnu_field = TYPE_FIELDS (qual_union_type);
|
||
gnu_field;
|
||
gnu_field = TREE_CHAIN (gnu_field))
|
||
{
|
||
tree t, qual = DECL_QUALIFIER (gnu_field);
|
||
|
||
for (t = subst_list; t; t = TREE_CHAIN (t))
|
||
qual = SUBSTITUTE_IN_EXPR (qual, TREE_PURPOSE (t), TREE_VALUE (t));
|
||
|
||
/* If the new qualifier is not unconditionally false, its variant may
|
||
still be accessed. */
|
||
if (!integer_zerop (qual))
|
||
{
|
||
tree variant_type = TREE_TYPE (gnu_field), variant_subpart;
|
||
tree v = make_tree_vec (3);
|
||
TREE_VEC_ELT (v, 0) = gnu_field;
|
||
TREE_VEC_ELT (v, 1) = qual;
|
||
TREE_VEC_ELT (v, 2) = NULL_TREE;
|
||
gnu_list = tree_cons (variant_type, v, gnu_list);
|
||
|
||
/* Recurse on the variant subpart of the variant, if any. */
|
||
variant_subpart = get_variant_part (variant_type);
|
||
if (variant_subpart)
|
||
gnu_list = build_variant_list (TREE_TYPE (variant_subpart),
|
||
subst_list, gnu_list);
|
||
|
||
/* If the new qualifier is unconditionally true, the subsequent
|
||
variants cannot be accessed. */
|
||
if (integer_onep (qual))
|
||
break;
|
||
}
|
||
}
|
||
|
||
return gnu_list;
|
||
}
|
||
|
||
/* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
|
||
corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
|
||
to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
|
||
the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
|
||
for the size of a field. COMPONENT_P is true if we are being called
|
||
to process the Component_Size of GNAT_OBJECT. This is used for error
|
||
message handling and to indicate to use the object size of GNU_TYPE.
|
||
ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
|
||
it means that a size of zero should be treated as an unspecified size. */
|
||
|
||
static tree
|
||
validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
|
||
enum tree_code kind, bool component_p, bool zero_ok)
|
||
{
|
||
Node_Id gnat_error_node;
|
||
tree type_size, size;
|
||
|
||
/* Return 0 if no size was specified. */
|
||
if (uint_size == No_Uint)
|
||
return NULL_TREE;
|
||
|
||
/* Ignore a negative size since that corresponds to our back-annotation. */
|
||
if (UI_Lt (uint_size, Uint_0))
|
||
return NULL_TREE;
|
||
|
||
/* Find the node to use for errors. */
|
||
if ((Ekind (gnat_object) == E_Component
|
||
|| Ekind (gnat_object) == E_Discriminant)
|
||
&& Present (Component_Clause (gnat_object)))
|
||
gnat_error_node = Last_Bit (Component_Clause (gnat_object));
|
||
else if (Present (Size_Clause (gnat_object)))
|
||
gnat_error_node = Expression (Size_Clause (gnat_object));
|
||
else
|
||
gnat_error_node = gnat_object;
|
||
|
||
/* Get the size as a tree. Issue an error if a size was specified but
|
||
cannot be represented in sizetype. */
|
||
size = UI_To_gnu (uint_size, bitsizetype);
|
||
if (TREE_OVERFLOW (size))
|
||
{
|
||
if (component_p)
|
||
post_error_ne ("component size of & is too large", gnat_error_node,
|
||
gnat_object);
|
||
else
|
||
post_error_ne ("size of & is too large", gnat_error_node,
|
||
gnat_object);
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* Ignore a zero size if it is not permitted. */
|
||
if (!zero_ok && integer_zerop (size))
|
||
return NULL_TREE;
|
||
|
||
/* The size of objects is always a multiple of a byte. */
|
||
if (kind == VAR_DECL
|
||
&& !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
|
||
{
|
||
if (component_p)
|
||
post_error_ne ("component size for& is not a multiple of Storage_Unit",
|
||
gnat_error_node, gnat_object);
|
||
else
|
||
post_error_ne ("size for& is not a multiple of Storage_Unit",
|
||
gnat_error_node, gnat_object);
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* If this is an integral type or a packed array type, the front-end has
|
||
verified the size, so we need not do it here (which would entail
|
||
checking against the bounds). However, if this is an aliased object,
|
||
it may not be smaller than the type of the object. */
|
||
if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
|
||
&& !(kind == VAR_DECL && Is_Aliased (gnat_object)))
|
||
return size;
|
||
|
||
/* If the object is a record that contains a template, add the size of
|
||
the template to the specified size. */
|
||
if (TREE_CODE (gnu_type) == RECORD_TYPE
|
||
&& TYPE_CONTAINS_TEMPLATE_P (gnu_type))
|
||
size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
|
||
|
||
if (kind == VAR_DECL
|
||
/* If a type needs strict alignment, a component of this type in
|
||
a packed record cannot be packed and thus uses the type size. */
|
||
|| (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
|
||
type_size = TYPE_SIZE (gnu_type);
|
||
else
|
||
type_size = rm_size (gnu_type);
|
||
|
||
/* Modify the size of the type to be that of the maximum size if it has a
|
||
discriminant. */
|
||
if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
|
||
type_size = max_size (type_size, true);
|
||
|
||
/* If this is an access type or a fat pointer, the minimum size is that given
|
||
by the smallest integral mode that's valid for pointers. */
|
||
if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type))
|
||
{
|
||
enum machine_mode p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
|
||
while (!targetm.valid_pointer_mode (p_mode))
|
||
p_mode = GET_MODE_WIDER_MODE (p_mode);
|
||
type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
|
||
}
|
||
|
||
/* If the size of the object is a constant, the new size must not be
|
||
smaller. */
|
||
if (TREE_CODE (type_size) != INTEGER_CST
|
||
|| TREE_OVERFLOW (type_size)
|
||
|| tree_int_cst_lt (size, type_size))
|
||
{
|
||
if (component_p)
|
||
post_error_ne_tree
|
||
("component size for& too small{, minimum allowed is ^}",
|
||
gnat_error_node, gnat_object, type_size);
|
||
else
|
||
post_error_ne_tree
|
||
("size for& too small{, minimum allowed is ^}",
|
||
gnat_error_node, gnat_object, type_size);
|
||
|
||
size = NULL_TREE;
|
||
}
|
||
|
||
return size;
|
||
}
|
||
|
||
/* Similarly, but both validate and process a value of RM size. This
|
||
routine is only called for types. */
|
||
|
||
static void
|
||
set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
|
||
{
|
||
Node_Id gnat_attr_node;
|
||
tree old_size, size;
|
||
|
||
/* Do nothing if no size was specified. */
|
||
if (uint_size == No_Uint)
|
||
return;
|
||
|
||
/* Ignore a negative size since that corresponds to our back-annotation. */
|
||
if (UI_Lt (uint_size, Uint_0))
|
||
return;
|
||
|
||
/* Only issue an error if a Value_Size clause was explicitly given.
|
||
Otherwise, we'd be duplicating an error on the Size clause. */
|
||
gnat_attr_node
|
||
= Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
|
||
|
||
/* Get the size as a tree. Issue an error if a size was specified but
|
||
cannot be represented in sizetype. */
|
||
size = UI_To_gnu (uint_size, bitsizetype);
|
||
if (TREE_OVERFLOW (size))
|
||
{
|
||
if (Present (gnat_attr_node))
|
||
post_error_ne ("Value_Size of & is too large", gnat_attr_node,
|
||
gnat_entity);
|
||
return;
|
||
}
|
||
|
||
/* Ignore a zero size unless a Value_Size clause exists, or a size clause
|
||
exists, or this is an integer type, in which case the front-end will
|
||
have always set it. */
|
||
if (No (gnat_attr_node)
|
||
&& integer_zerop (size)
|
||
&& !Has_Size_Clause (gnat_entity)
|
||
&& !Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
|
||
return;
|
||
|
||
old_size = rm_size (gnu_type);
|
||
|
||
/* If the old size is self-referential, get the maximum size. */
|
||
if (CONTAINS_PLACEHOLDER_P (old_size))
|
||
old_size = max_size (old_size, true);
|
||
|
||
/* If the size of the object is a constant, the new size must not be smaller
|
||
(the front-end has verified this for scalar and packed array types). */
|
||
if (TREE_CODE (old_size) != INTEGER_CST
|
||
|| TREE_OVERFLOW (old_size)
|
||
|| (AGGREGATE_TYPE_P (gnu_type)
|
||
&& !(TREE_CODE (gnu_type) == ARRAY_TYPE
|
||
&& TYPE_PACKED_ARRAY_TYPE_P (gnu_type))
|
||
&& !(TYPE_IS_PADDING_P (gnu_type)
|
||
&& TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE
|
||
&& TYPE_PACKED_ARRAY_TYPE_P
|
||
(TREE_TYPE (TYPE_FIELDS (gnu_type))))
|
||
&& tree_int_cst_lt (size, old_size)))
|
||
{
|
||
if (Present (gnat_attr_node))
|
||
post_error_ne_tree
|
||
("Value_Size for& too small{, minimum allowed is ^}",
|
||
gnat_attr_node, gnat_entity, old_size);
|
||
return;
|
||
}
|
||
|
||
/* Otherwise, set the RM size proper for integral types... */
|
||
if ((TREE_CODE (gnu_type) == INTEGER_TYPE
|
||
&& Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
|
||
|| (TREE_CODE (gnu_type) == ENUMERAL_TYPE
|
||
|| TREE_CODE (gnu_type) == BOOLEAN_TYPE))
|
||
SET_TYPE_RM_SIZE (gnu_type, size);
|
||
|
||
/* ...or the Ada size for record and union types. */
|
||
else if ((TREE_CODE (gnu_type) == RECORD_TYPE
|
||
|| TREE_CODE (gnu_type) == UNION_TYPE
|
||
|| TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
|
||
&& !TYPE_FAT_POINTER_P (gnu_type))
|
||
SET_TYPE_ADA_SIZE (gnu_type, size);
|
||
}
|
||
|
||
/* Given a type TYPE, return a new type whose size is appropriate for SIZE.
|
||
If TYPE is the best type, return it. Otherwise, make a new type. We
|
||
only support new integral and pointer types. FOR_BIASED is true if
|
||
we are making a biased type. */
|
||
|
||
static tree
|
||
make_type_from_size (tree type, tree size_tree, bool for_biased)
|
||
{
|
||
unsigned HOST_WIDE_INT size;
|
||
bool biased_p;
|
||
tree new_type;
|
||
|
||
/* If size indicates an error, just return TYPE to avoid propagating
|
||
the error. Likewise if it's too large to represent. */
|
||
if (!size_tree || !host_integerp (size_tree, 1))
|
||
return type;
|
||
|
||
size = tree_low_cst (size_tree, 1);
|
||
|
||
switch (TREE_CODE (type))
|
||
{
|
||
case INTEGER_TYPE:
|
||
case ENUMERAL_TYPE:
|
||
case BOOLEAN_TYPE:
|
||
biased_p = (TREE_CODE (type) == INTEGER_TYPE
|
||
&& TYPE_BIASED_REPRESENTATION_P (type));
|
||
|
||
/* Integer types with precision 0 are forbidden. */
|
||
if (size == 0)
|
||
size = 1;
|
||
|
||
/* Only do something if the type is not a packed array type and
|
||
doesn't already have the proper size. */
|
||
if (TYPE_PACKED_ARRAY_TYPE_P (type)
|
||
|| (TYPE_PRECISION (type) == size && biased_p == for_biased))
|
||
break;
|
||
|
||
biased_p |= for_biased;
|
||
if (size > LONG_LONG_TYPE_SIZE)
|
||
size = LONG_LONG_TYPE_SIZE;
|
||
|
||
if (TYPE_UNSIGNED (type) || biased_p)
|
||
new_type = make_unsigned_type (size);
|
||
else
|
||
new_type = make_signed_type (size);
|
||
TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
|
||
SET_TYPE_RM_MIN_VALUE (new_type,
|
||
convert (TREE_TYPE (new_type),
|
||
TYPE_MIN_VALUE (type)));
|
||
SET_TYPE_RM_MAX_VALUE (new_type,
|
||
convert (TREE_TYPE (new_type),
|
||
TYPE_MAX_VALUE (type)));
|
||
/* Copy the name to show that it's essentially the same type and
|
||
not a subrange type. */
|
||
TYPE_NAME (new_type) = TYPE_NAME (type);
|
||
TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
|
||
SET_TYPE_RM_SIZE (new_type, bitsize_int (size));
|
||
return new_type;
|
||
|
||
case RECORD_TYPE:
|
||
/* Do something if this is a fat pointer, in which case we
|
||
may need to return the thin pointer. */
|
||
if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
|
||
{
|
||
enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
|
||
if (!targetm.valid_pointer_mode (p_mode))
|
||
p_mode = ptr_mode;
|
||
return
|
||
build_pointer_type_for_mode
|
||
(TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
|
||
p_mode, 0);
|
||
}
|
||
break;
|
||
|
||
case POINTER_TYPE:
|
||
/* Only do something if this is a thin pointer, in which case we
|
||
may need to return the fat pointer. */
|
||
if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
|
||
return
|
||
build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return type;
|
||
}
|
||
|
||
/* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
|
||
a type or object whose present alignment is ALIGN. If this alignment is
|
||
valid, return it. Otherwise, give an error and return ALIGN. */
|
||
|
||
static unsigned int
|
||
validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
|
||
{
|
||
unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
|
||
unsigned int new_align;
|
||
Node_Id gnat_error_node;
|
||
|
||
/* Don't worry about checking alignment if alignment was not specified
|
||
by the source program and we already posted an error for this entity. */
|
||
if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
|
||
return align;
|
||
|
||
/* Post the error on the alignment clause if any. Note, for the implicit
|
||
base type of an array type, the alignment clause is on the first
|
||
subtype. */
|
||
if (Present (Alignment_Clause (gnat_entity)))
|
||
gnat_error_node = Expression (Alignment_Clause (gnat_entity));
|
||
|
||
else if (Is_Itype (gnat_entity)
|
||
&& Is_Array_Type (gnat_entity)
|
||
&& Etype (gnat_entity) == gnat_entity
|
||
&& Present (Alignment_Clause (First_Subtype (gnat_entity))))
|
||
gnat_error_node =
|
||
Expression (Alignment_Clause (First_Subtype (gnat_entity)));
|
||
|
||
else
|
||
gnat_error_node = gnat_entity;
|
||
|
||
/* Within GCC, an alignment is an integer, so we must make sure a value is
|
||
specified that fits in that range. Also, there is an upper bound to
|
||
alignments we can support/allow. */
|
||
if (!UI_Is_In_Int_Range (alignment)
|
||
|| ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
|
||
post_error_ne_num ("largest supported alignment for& is ^",
|
||
gnat_error_node, gnat_entity, max_allowed_alignment);
|
||
else if (!(Present (Alignment_Clause (gnat_entity))
|
||
&& From_At_Mod (Alignment_Clause (gnat_entity)))
|
||
&& new_align * BITS_PER_UNIT < align)
|
||
{
|
||
unsigned int double_align;
|
||
bool is_capped_double, align_clause;
|
||
|
||
/* If the default alignment of "double" or larger scalar types is
|
||
specifically capped and the new alignment is above the cap, do
|
||
not post an error and change the alignment only if there is an
|
||
alignment clause; this makes it possible to have the associated
|
||
GCC type overaligned by default for performance reasons. */
|
||
if ((double_align = double_float_alignment) > 0)
|
||
{
|
||
Entity_Id gnat_type
|
||
= Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
|
||
is_capped_double
|
||
= is_double_float_or_array (gnat_type, &align_clause);
|
||
}
|
||
else if ((double_align = double_scalar_alignment) > 0)
|
||
{
|
||
Entity_Id gnat_type
|
||
= Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
|
||
is_capped_double
|
||
= is_double_scalar_or_array (gnat_type, &align_clause);
|
||
}
|
||
else
|
||
is_capped_double = align_clause = false;
|
||
|
||
if (is_capped_double && new_align >= double_align)
|
||
{
|
||
if (align_clause)
|
||
align = new_align * BITS_PER_UNIT;
|
||
}
|
||
else
|
||
{
|
||
if (is_capped_double)
|
||
align = double_align * BITS_PER_UNIT;
|
||
|
||
post_error_ne_num ("alignment for& must be at least ^",
|
||
gnat_error_node, gnat_entity,
|
||
align / BITS_PER_UNIT);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
|
||
if (new_align > align)
|
||
align = new_align;
|
||
}
|
||
|
||
return align;
|
||
}
|
||
|
||
/* Return the smallest alignment not less than SIZE. */
|
||
|
||
static unsigned int
|
||
ceil_alignment (unsigned HOST_WIDE_INT size)
|
||
{
|
||
return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
|
||
}
|
||
|
||
/* Verify that OBJECT, a type or decl, is something we can implement
|
||
atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
|
||
if we require atomic components. */
|
||
|
||
static void
|
||
check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
|
||
{
|
||
Node_Id gnat_error_point = gnat_entity;
|
||
Node_Id gnat_node;
|
||
enum machine_mode mode;
|
||
unsigned int align;
|
||
tree size;
|
||
|
||
/* There are three case of what OBJECT can be. It can be a type, in which
|
||
case we take the size, alignment and mode from the type. It can be a
|
||
declaration that was indirect, in which case the relevant values are
|
||
that of the type being pointed to, or it can be a normal declaration,
|
||
in which case the values are of the decl. The code below assumes that
|
||
OBJECT is either a type or a decl. */
|
||
if (TYPE_P (object))
|
||
{
|
||
/* If this is an anonymous base type, nothing to check. Error will be
|
||
reported on the source type. */
|
||
if (!Comes_From_Source (gnat_entity))
|
||
return;
|
||
|
||
mode = TYPE_MODE (object);
|
||
align = TYPE_ALIGN (object);
|
||
size = TYPE_SIZE (object);
|
||
}
|
||
else if (DECL_BY_REF_P (object))
|
||
{
|
||
mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
|
||
align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
|
||
size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
|
||
}
|
||
else
|
||
{
|
||
mode = DECL_MODE (object);
|
||
align = DECL_ALIGN (object);
|
||
size = DECL_SIZE (object);
|
||
}
|
||
|
||
/* Consider all floating-point types atomic and any types that that are
|
||
represented by integers no wider than a machine word. */
|
||
if (GET_MODE_CLASS (mode) == MODE_FLOAT
|
||
|| ((GET_MODE_CLASS (mode) == MODE_INT
|
||
|| GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
|
||
&& GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
|
||
return;
|
||
|
||
/* For the moment, also allow anything that has an alignment equal
|
||
to its size and which is smaller than a word. */
|
||
if (size && TREE_CODE (size) == INTEGER_CST
|
||
&& compare_tree_int (size, align) == 0
|
||
&& align <= BITS_PER_WORD)
|
||
return;
|
||
|
||
for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
|
||
gnat_node = Next_Rep_Item (gnat_node))
|
||
{
|
||
if (!comp_p && Nkind (gnat_node) == N_Pragma
|
||
&& (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
|
||
== Pragma_Atomic))
|
||
gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
|
||
else if (comp_p && Nkind (gnat_node) == N_Pragma
|
||
&& (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
|
||
== Pragma_Atomic_Components))
|
||
gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
|
||
}
|
||
|
||
if (comp_p)
|
||
post_error_ne ("atomic access to component of & cannot be guaranteed",
|
||
gnat_error_point, gnat_entity);
|
||
else
|
||
post_error_ne ("atomic access to & cannot be guaranteed",
|
||
gnat_error_point, gnat_entity);
|
||
}
|
||
|
||
/* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
|
||
have compatible signatures so that a call using one type may be safely
|
||
issued if the actual target function type is the other. Return 1 if it is
|
||
the case, 0 otherwise, and post errors on the incompatibilities.
|
||
|
||
This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
|
||
that calls to the subprogram will have arguments suitable for the later
|
||
underlying builtin expansion. */
|
||
|
||
static int
|
||
compatible_signatures_p (tree ftype1, tree ftype2)
|
||
{
|
||
/* As of now, we only perform very trivial tests and consider it's the
|
||
programmer's responsibility to ensure the type correctness in the Ada
|
||
declaration, as in the regular Import cases.
|
||
|
||
Mismatches typically result in either error messages from the builtin
|
||
expander, internal compiler errors, or in a real call sequence. This
|
||
should be refined to issue diagnostics helping error detection and
|
||
correction. */
|
||
|
||
/* Almost fake test, ensuring a use of each argument. */
|
||
if (ftype1 == ftype2)
|
||
return 1;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type
|
||
and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the
|
||
specified size for this field. POS_LIST is a position list describing
|
||
the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied
|
||
to this layout. */
|
||
|
||
static tree
|
||
create_field_decl_from (tree old_field, tree field_type, tree record_type,
|
||
tree size, tree pos_list, tree subst_list)
|
||
{
|
||
tree t = TREE_VALUE (purpose_member (old_field, pos_list));
|
||
tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2);
|
||
unsigned int offset_align = tree_low_cst (TREE_VEC_ELT (t, 1), 1);
|
||
tree new_pos, new_field;
|
||
|
||
if (CONTAINS_PLACEHOLDER_P (pos))
|
||
for (t = subst_list; t; t = TREE_CHAIN (t))
|
||
pos = SUBSTITUTE_IN_EXPR (pos, TREE_PURPOSE (t), TREE_VALUE (t));
|
||
|
||
/* If the position is now a constant, we can set it as the position of the
|
||
field when we make it. Otherwise, we need to deal with it specially. */
|
||
if (TREE_CONSTANT (pos))
|
||
new_pos = bit_from_pos (pos, bitpos);
|
||
else
|
||
new_pos = NULL_TREE;
|
||
|
||
new_field
|
||
= create_field_decl (DECL_NAME (old_field), field_type, record_type,
|
||
size, new_pos, DECL_PACKED (old_field),
|
||
!DECL_NONADDRESSABLE_P (old_field));
|
||
|
||
if (!new_pos)
|
||
{
|
||
normalize_offset (&pos, &bitpos, offset_align);
|
||
DECL_FIELD_OFFSET (new_field) = pos;
|
||
DECL_FIELD_BIT_OFFSET (new_field) = bitpos;
|
||
SET_DECL_OFFSET_ALIGN (new_field, offset_align);
|
||
DECL_SIZE (new_field) = size;
|
||
DECL_SIZE_UNIT (new_field)
|
||
= convert (sizetype,
|
||
size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node));
|
||
layout_decl (new_field, DECL_OFFSET_ALIGN (new_field));
|
||
}
|
||
|
||
DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
|
||
SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
|
||
DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field);
|
||
TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field);
|
||
|
||
return new_field;
|
||
}
|
||
|
||
/* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */
|
||
|
||
static tree
|
||
get_rep_part (tree record_type)
|
||
{
|
||
tree field = TYPE_FIELDS (record_type);
|
||
|
||
/* The REP part is the first field, internal, another record, and its name
|
||
doesn't start with an underscore (i.e. is not generated by the FE). */
|
||
if (DECL_INTERNAL_P (field)
|
||
&& TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
|
||
&& IDENTIFIER_POINTER (DECL_NAME (field)) [0] != '_')
|
||
return field;
|
||
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */
|
||
|
||
static tree
|
||
get_variant_part (tree record_type)
|
||
{
|
||
tree field;
|
||
|
||
/* The variant part is the only internal field that is a qualified union. */
|
||
for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field))
|
||
if (DECL_INTERNAL_P (field)
|
||
&& TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE)
|
||
return field;
|
||
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is
|
||
the list of variants to be used and RECORD_TYPE is the type of the parent.
|
||
POS_LIST is a position list describing the layout of fields present in
|
||
OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this
|
||
layout. */
|
||
|
||
static tree
|
||
create_variant_part_from (tree old_variant_part, tree variant_list,
|
||
tree record_type, tree pos_list, tree subst_list)
|
||
{
|
||
tree offset = DECL_FIELD_OFFSET (old_variant_part);
|
||
tree old_union_type = TREE_TYPE (old_variant_part);
|
||
tree new_union_type, new_variant_part, t;
|
||
tree union_field_list = NULL_TREE;
|
||
|
||
/* First create the type of the variant part from that of the old one. */
|
||
new_union_type = make_node (QUAL_UNION_TYPE);
|
||
TYPE_NAME (new_union_type) = DECL_NAME (TYPE_NAME (old_union_type));
|
||
|
||
/* If the position of the variant part is constant, subtract it from the
|
||
size of the type of the parent to get the new size. This manual CSE
|
||
reduces the code size when not optimizing. */
|
||
if (TREE_CODE (offset) == INTEGER_CST)
|
||
{
|
||
tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part);
|
||
tree first_bit = bit_from_pos (offset, bitpos);
|
||
TYPE_SIZE (new_union_type)
|
||
= size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit);
|
||
TYPE_SIZE_UNIT (new_union_type)
|
||
= size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type),
|
||
byte_from_pos (offset, bitpos));
|
||
SET_TYPE_ADA_SIZE (new_union_type,
|
||
size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type),
|
||
first_bit));
|
||
TYPE_ALIGN (new_union_type) = TYPE_ALIGN (old_union_type);
|
||
relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY);
|
||
}
|
||
else
|
||
copy_and_substitute_in_size (new_union_type, old_union_type, subst_list);
|
||
|
||
/* Now finish up the new variants and populate the union type. */
|
||
for (t = variant_list; t; t = TREE_CHAIN (t))
|
||
{
|
||
tree old_field = TREE_VEC_ELT (TREE_VALUE (t), 0), new_field;
|
||
tree old_variant, old_variant_subpart, new_variant, field_list;
|
||
|
||
/* Skip variants that don't belong to this nesting level. */
|
||
if (DECL_CONTEXT (old_field) != old_union_type)
|
||
continue;
|
||
|
||
/* Retrieve the list of fields already added to the new variant. */
|
||
new_variant = TREE_VEC_ELT (TREE_VALUE (t), 2);
|
||
field_list = TYPE_FIELDS (new_variant);
|
||
|
||
/* If the old variant had a variant subpart, we need to create a new
|
||
variant subpart and add it to the field list. */
|
||
old_variant = TREE_PURPOSE (t);
|
||
old_variant_subpart = get_variant_part (old_variant);
|
||
if (old_variant_subpart)
|
||
{
|
||
tree new_variant_subpart
|
||
= create_variant_part_from (old_variant_subpart, variant_list,
|
||
new_variant, pos_list, subst_list);
|
||
TREE_CHAIN (new_variant_subpart) = field_list;
|
||
field_list = new_variant_subpart;
|
||
}
|
||
|
||
/* Finish up the new variant and create the field. No need for debug
|
||
info thanks to the XVS type. */
|
||
finish_record_type (new_variant, nreverse (field_list), 2, false);
|
||
compute_record_mode (new_variant);
|
||
create_type_decl (TYPE_NAME (new_variant), new_variant, NULL,
|
||
true, false, Empty);
|
||
|
||
new_field
|
||
= create_field_decl_from (old_field, new_variant, new_union_type,
|
||
TYPE_SIZE (new_variant),
|
||
pos_list, subst_list);
|
||
DECL_QUALIFIER (new_field) = TREE_VEC_ELT (TREE_VALUE (t), 1);
|
||
DECL_INTERNAL_P (new_field) = 1;
|
||
TREE_CHAIN (new_field) = union_field_list;
|
||
union_field_list = new_field;
|
||
}
|
||
|
||
/* Finish up the union type and create the variant part. No need for debug
|
||
info thanks to the XVS type. */
|
||
finish_record_type (new_union_type, union_field_list, 2, false);
|
||
compute_record_mode (new_union_type);
|
||
create_type_decl (TYPE_NAME (new_union_type), new_union_type, NULL,
|
||
true, false, Empty);
|
||
|
||
new_variant_part
|
||
= create_field_decl_from (old_variant_part, new_union_type, record_type,
|
||
TYPE_SIZE (new_union_type),
|
||
pos_list, subst_list);
|
||
DECL_INTERNAL_P (new_variant_part) = 1;
|
||
|
||
/* With multiple discriminants it is possible for an inner variant to be
|
||
statically selected while outer ones are not; in this case, the list
|
||
of fields of the inner variant is not flattened and we end up with a
|
||
qualified union with a single member. Drop the useless container. */
|
||
if (!TREE_CHAIN (union_field_list))
|
||
{
|
||
DECL_CONTEXT (union_field_list) = record_type;
|
||
DECL_FIELD_OFFSET (union_field_list)
|
||
= DECL_FIELD_OFFSET (new_variant_part);
|
||
DECL_FIELD_BIT_OFFSET (union_field_list)
|
||
= DECL_FIELD_BIT_OFFSET (new_variant_part);
|
||
SET_DECL_OFFSET_ALIGN (union_field_list,
|
||
DECL_OFFSET_ALIGN (new_variant_part));
|
||
new_variant_part = union_field_list;
|
||
}
|
||
|
||
return new_variant_part;
|
||
}
|
||
|
||
/* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE,
|
||
which are both RECORD_TYPE, after applying the substitutions described
|
||
in SUBST_LIST. */
|
||
|
||
static void
|
||
copy_and_substitute_in_size (tree new_type, tree old_type, tree subst_list)
|
||
{
|
||
tree t;
|
||
|
||
TYPE_SIZE (new_type) = TYPE_SIZE (old_type);
|
||
TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type);
|
||
SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type));
|
||
TYPE_ALIGN (new_type) = TYPE_ALIGN (old_type);
|
||
relate_alias_sets (new_type, old_type, ALIAS_SET_COPY);
|
||
|
||
if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type)))
|
||
for (t = subst_list; t; t = TREE_CHAIN (t))
|
||
TYPE_SIZE (new_type)
|
||
= SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type),
|
||
TREE_PURPOSE (t),
|
||
TREE_VALUE (t));
|
||
|
||
if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type)))
|
||
for (t = subst_list; t; t = TREE_CHAIN (t))
|
||
TYPE_SIZE_UNIT (new_type)
|
||
= SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type),
|
||
TREE_PURPOSE (t),
|
||
TREE_VALUE (t));
|
||
|
||
if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type)))
|
||
for (t = subst_list; t; t = TREE_CHAIN (t))
|
||
SET_TYPE_ADA_SIZE
|
||
(new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type),
|
||
TREE_PURPOSE (t),
|
||
TREE_VALUE (t)));
|
||
|
||
/* Finalize the size. */
|
||
TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type));
|
||
TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type));
|
||
}
|
||
|
||
/* Given a type T, a FIELD_DECL F, and a replacement value R, return a
|
||
type with all size expressions that contain F in a PLACEHOLDER_EXPR
|
||
updated by replacing F with R.
|
||
|
||
The function doesn't update the layout of the type, i.e. it assumes
|
||
that the substitution is purely formal. That's why the replacement
|
||
value R must itself contain a PLACEHOLDER_EXPR. */
|
||
|
||
tree
|
||
substitute_in_type (tree t, tree f, tree r)
|
||
{
|
||
tree nt;
|
||
|
||
gcc_assert (CONTAINS_PLACEHOLDER_P (r));
|
||
|
||
switch (TREE_CODE (t))
|
||
{
|
||
case INTEGER_TYPE:
|
||
case ENUMERAL_TYPE:
|
||
case BOOLEAN_TYPE:
|
||
case REAL_TYPE:
|
||
|
||
/* First the domain types of arrays. */
|
||
if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t))
|
||
|| CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t)))
|
||
{
|
||
tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r);
|
||
tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r);
|
||
|
||
if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t))
|
||
return t;
|
||
|
||
nt = copy_type (t);
|
||
TYPE_GCC_MIN_VALUE (nt) = low;
|
||
TYPE_GCC_MAX_VALUE (nt) = high;
|
||
|
||
if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t))
|
||
SET_TYPE_INDEX_TYPE
|
||
(nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
|
||
|
||
return nt;
|
||
}
|
||
|
||
/* Then the subtypes. */
|
||
if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t))
|
||
|| CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t)))
|
||
{
|
||
tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r);
|
||
tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r);
|
||
|
||
if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t))
|
||
return t;
|
||
|
||
nt = copy_type (t);
|
||
SET_TYPE_RM_MIN_VALUE (nt, low);
|
||
SET_TYPE_RM_MAX_VALUE (nt, high);
|
||
|
||
return nt;
|
||
}
|
||
|
||
return t;
|
||
|
||
case COMPLEX_TYPE:
|
||
nt = substitute_in_type (TREE_TYPE (t), f, r);
|
||
if (nt == TREE_TYPE (t))
|
||
return t;
|
||
|
||
return build_complex_type (nt);
|
||
|
||
case OFFSET_TYPE:
|
||
case METHOD_TYPE:
|
||
case FUNCTION_TYPE:
|
||
case LANG_TYPE:
|
||
/* These should never show up here. */
|
||
gcc_unreachable ();
|
||
|
||
case ARRAY_TYPE:
|
||
{
|
||
tree component = substitute_in_type (TREE_TYPE (t), f, r);
|
||
tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
|
||
|
||
if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
|
||
return t;
|
||
|
||
nt = build_array_type (component, domain);
|
||
TYPE_ALIGN (nt) = TYPE_ALIGN (t);
|
||
TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t);
|
||
SET_TYPE_MODE (nt, TYPE_MODE (t));
|
||
TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
|
||
TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
|
||
TYPE_NONALIASED_COMPONENT (nt) = TYPE_NONALIASED_COMPONENT (t);
|
||
TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t);
|
||
TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t);
|
||
return nt;
|
||
}
|
||
|
||
case RECORD_TYPE:
|
||
case UNION_TYPE:
|
||
case QUAL_UNION_TYPE:
|
||
{
|
||
bool changed_field = false;
|
||
tree field;
|
||
|
||
/* Start out with no fields, make new fields, and chain them
|
||
in. If we haven't actually changed the type of any field,
|
||
discard everything we've done and return the old type. */
|
||
nt = copy_type (t);
|
||
TYPE_FIELDS (nt) = NULL_TREE;
|
||
|
||
for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
|
||
{
|
||
tree new_field = copy_node (field), new_n;
|
||
|
||
new_n = substitute_in_type (TREE_TYPE (field), f, r);
|
||
if (new_n != TREE_TYPE (field))
|
||
{
|
||
TREE_TYPE (new_field) = new_n;
|
||
changed_field = true;
|
||
}
|
||
|
||
new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
|
||
if (new_n != DECL_FIELD_OFFSET (field))
|
||
{
|
||
DECL_FIELD_OFFSET (new_field) = new_n;
|
||
changed_field = true;
|
||
}
|
||
|
||
/* Do the substitution inside the qualifier, if any. */
|
||
if (TREE_CODE (t) == QUAL_UNION_TYPE)
|
||
{
|
||
new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
|
||
if (new_n != DECL_QUALIFIER (field))
|
||
{
|
||
DECL_QUALIFIER (new_field) = new_n;
|
||
changed_field = true;
|
||
}
|
||
}
|
||
|
||
DECL_CONTEXT (new_field) = nt;
|
||
SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field);
|
||
|
||
TREE_CHAIN (new_field) = TYPE_FIELDS (nt);
|
||
TYPE_FIELDS (nt) = new_field;
|
||
}
|
||
|
||
if (!changed_field)
|
||
return t;
|
||
|
||
TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt));
|
||
TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
|
||
TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
|
||
SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
|
||
return nt;
|
||
}
|
||
|
||
default:
|
||
return t;
|
||
}
|
||
}
|
||
|
||
/* Return the RM size of GNU_TYPE. This is the actual number of bits
|
||
needed to represent the object. */
|
||
|
||
tree
|
||
rm_size (tree gnu_type)
|
||
{
|
||
/* For integral types, we store the RM size explicitly. */
|
||
if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
|
||
return TYPE_RM_SIZE (gnu_type);
|
||
|
||
/* Return the RM size of the actual data plus the size of the template. */
|
||
if (TREE_CODE (gnu_type) == RECORD_TYPE
|
||
&& TYPE_CONTAINS_TEMPLATE_P (gnu_type))
|
||
return
|
||
size_binop (PLUS_EXPR,
|
||
rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
|
||
DECL_SIZE (TYPE_FIELDS (gnu_type)));
|
||
|
||
/* For record types, we store the size explicitly. */
|
||
if ((TREE_CODE (gnu_type) == RECORD_TYPE
|
||
|| TREE_CODE (gnu_type) == UNION_TYPE
|
||
|| TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
|
||
&& !TYPE_FAT_POINTER_P (gnu_type)
|
||
&& TYPE_ADA_SIZE (gnu_type))
|
||
return TYPE_ADA_SIZE (gnu_type);
|
||
|
||
/* For other types, this is just the size. */
|
||
return TYPE_SIZE (gnu_type);
|
||
}
|
||
|
||
/* Return the name to be used for GNAT_ENTITY. If a type, create a
|
||
fully-qualified name, possibly with type information encoding.
|
||
Otherwise, return the name. */
|
||
|
||
tree
|
||
get_entity_name (Entity_Id gnat_entity)
|
||
{
|
||
Get_Encoded_Name (gnat_entity);
|
||
return get_identifier_with_length (Name_Buffer, Name_Len);
|
||
}
|
||
|
||
/* Return an identifier representing the external name to be used for
|
||
GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
|
||
and the specified suffix. */
|
||
|
||
tree
|
||
create_concat_name (Entity_Id gnat_entity, const char *suffix)
|
||
{
|
||
Entity_Kind kind = Ekind (gnat_entity);
|
||
|
||
if (suffix)
|
||
{
|
||
String_Template temp = {1, strlen (suffix)};
|
||
Fat_Pointer fp = {suffix, &temp};
|
||
Get_External_Name_With_Suffix (gnat_entity, fp);
|
||
}
|
||
else
|
||
Get_External_Name (gnat_entity, 0);
|
||
|
||
/* A variable using the Stdcall convention lives in a DLL. We adjust
|
||
its name to use the jump table, the _imp__NAME contains the address
|
||
for the NAME variable. */
|
||
if ((kind == E_Variable || kind == E_Constant)
|
||
&& Has_Stdcall_Convention (gnat_entity))
|
||
{
|
||
const int len = 6 + Name_Len;
|
||
char *new_name = (char *) alloca (len + 1);
|
||
strcpy (new_name, "_imp__");
|
||
strcat (new_name, Name_Buffer);
|
||
return get_identifier_with_length (new_name, len);
|
||
}
|
||
|
||
return get_identifier_with_length (Name_Buffer, Name_Len);
|
||
}
|
||
|
||
/* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
|
||
string, return a new IDENTIFIER_NODE that is the concatenation of
|
||
the name followed by "___" and the specified suffix. */
|
||
|
||
tree
|
||
concat_name (tree gnu_name, const char *suffix)
|
||
{
|
||
const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
|
||
char *new_name = (char *) alloca (len + 1);
|
||
strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
|
||
strcat (new_name, "___");
|
||
strcat (new_name, suffix);
|
||
return get_identifier_with_length (new_name, len);
|
||
}
|
||
|
||
#include "gt-ada-decl.h"
|