175 lines
9.6 KiB
Ada
175 lines
9.6 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S E M _ C H 1 2 --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Inline; use Inline;
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with Types; use Types;
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package Sem_Ch12 is
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procedure Analyze_Generic_Package_Declaration (N : Node_Id);
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procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id);
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procedure Analyze_Package_Instantiation (N : Node_Id);
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procedure Analyze_Procedure_Instantiation (N : Node_Id);
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procedure Analyze_Function_Instantiation (N : Node_Id);
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procedure Analyze_Formal_Object_Declaration (N : Node_Id);
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procedure Analyze_Formal_Type_Declaration (N : Node_Id);
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procedure Analyze_Formal_Subprogram (N : Node_Id);
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procedure Analyze_Formal_Package (N : Node_Id);
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procedure Start_Generic;
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-- Must be invoked before starting to process a generic spec or body
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procedure End_Generic;
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-- Must be invoked just at the end of the end of the processing of a
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-- generic spec or body.
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procedure Check_Generic_Child_Unit
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(Gen_Id : Node_Id;
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Parent_Installed : in out Boolean);
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-- If the name of the generic unit in an instantiation or a renaming is a
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-- selected component, then the prefix may be an instance and the selector
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-- may designate a child unit. Retrieve the parent generic and search for
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-- the child unit that must be declared within. Similarly, if this is the
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-- name of a generic child unit within an instantiation of its own parent,
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-- retrieve the parent generic. If the parent is installed as a result of
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-- this call, then Parent_Installed is set True, otherwise Parent_Intalled
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-- is unchanged by the call.
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function Copy_Generic_Node
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(N : Node_Id;
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Parent_Id : Node_Id;
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Instantiating : Boolean) return Node_Id;
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-- Copy the tree for a generic unit or its body. The unit is copied
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-- repeatedly: once to produce a copy on which semantic analysis of
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-- the generic is performed, and once for each instantiation. The tree
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-- being copied is not semantically analyzed, except that references to
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-- global entities are marked on terminal nodes.
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function Get_Instance_Of (A : Entity_Id) return Entity_Id;
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-- Retrieve actual associated with given generic parameter.
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-- If A is uninstantiated or not a generic parameter, return A.
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function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
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-- Given the entity of a unit that is an instantiation, retrieve the
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-- original instance node. This is used when loading the instantiations
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-- of the ancestors of a child generic that is being instantiated.
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procedure Instantiate_Package_Body
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(Body_Info : Pending_Body_Info;
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Inlined_Body : Boolean := False;
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Body_Optional : Boolean := False);
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-- Called after semantic analysis, to complete the instantiation of
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-- package instances. The flag Inlined_Body is set if the body is
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-- being instantiated on the fly for inlined purposes.
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--
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-- The flag Body_Optional indicates that the call is for an instance
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-- that precedes the current instance in the same declarative part.
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-- This call is needed when instantiating a nested generic whose body
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-- is to be found in the body of an instance. Normally we instantiate
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-- package bodies only when they appear in the main unit, or when their
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-- contents are needed for a nested generic G. If unit U contains several
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-- instances I1, I2, etc. and I2 contains a nested generic, then when U
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-- appears in the context of some other unit P that contains an instance
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-- of G, we compile the body of I2, but not that of I1. However, when we
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-- compile U as the main unit, we compile both bodies. This will lead to
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-- lead to link-time errors if the compilation of I1 generates public
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-- symbols, because those in I2 will receive different names in both
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-- cases. This forces us to analyze the body of I1 even when U is not the
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-- main unit. We don't want this additional mechanism to generate an error
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-- when the body of the generic for I1 is not present, and this is the
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-- reason for the presence of the flag Body_Optional, which is exchanged
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-- between the current procedure and Load_Parent_Of_Generic.
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procedure Instantiate_Subprogram_Body
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(Body_Info : Pending_Body_Info;
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Body_Optional : Boolean := False);
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-- Called after semantic analysis, to complete the instantiation of
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-- function and procedure instances. The flag Body_Optional has the
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-- same purpose as described for Instantiate_Package_Body.
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function Need_Subprogram_Instance_Body
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(N : Node_Id;
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Subp : Entity_Id) return Boolean;
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-- If a subprogram instance is inlined, indicate that the body of it
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-- must be created, to be used in inlined calls by the back-end. The
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-- subprogram may be inlined because the generic itself carries the
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-- pragma, or because a pragma appears for the instance in the scope.
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-- of the instance.
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procedure Save_Global_References (N : Node_Id);
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-- Traverse the original generic unit, and capture all references to
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-- entities that are defined outside of the generic in the analyzed
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-- tree for the template. These references are copied into the original
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-- tree, so that they appear automatically in every instantiation.
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-- A critical invariant in this approach is that if an id in the generic
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-- resolves to a local entity, the corresponding id in the instance
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-- will resolve to the homologous entity in the instance, even though
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-- the enclosing context for resolution is different, as long as the
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-- global references have been captured as described here.
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-- Because instantiations can be nested, the environment of the instance,
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-- involving the actuals and other data-structures, must be saved and
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-- restored in stack-like fashion. Front-end inlining also uses these
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-- structures for the management of private/full views.
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procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id);
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-- This procedure is used when a subprogram body is inlined. This process
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-- shares the same circuitry as the creation of an instantiated copy of
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-- a generic template. The call to this procedure establishes a new source
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-- file entry representing the inlined body as an instantiation, marked as
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-- an inlined body (so that errout can distinguish cases for generating
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-- error messages, otherwise the treatment is identical). In this call
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-- N is the subprogram body and E is the defining identifier of the
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-- subprogram in question. The resulting Sloc adjustment factor is
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-- saved as part of the internal state of the Sem_Ch12 package for use
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-- in subsequent calls to copy nodes.
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procedure Save_Env
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(Gen_Unit : Entity_Id;
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Act_Unit : Entity_Id);
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-- ??? comment needed
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procedure Restore_Env;
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-- ??? comment needed
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procedure Initialize;
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-- Initializes internal data structures
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procedure Check_Private_View (N : Node_Id);
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-- Check whether the type of a generic entity has a different view between
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-- the point of generic analysis and the point of instantiation. If the
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-- view has changed, then at the point of instantiation we restore the
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-- correct view to perform semantic analysis of the instance, and reset
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-- the current view after instantiation. The processing is driven by the
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-- current private status of the type of the node, and Has_Private_View,
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-- a flag that is set at the point of generic compilation. If view and
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-- flag are inconsistent then the type is updated appropriately.
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--
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-- This subprogram is used in Check_Generic_Actuals and Copy_Generic_Node,
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-- and is exported here for the purpose of front-end inlining (see Exp_Ch6.
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-- Expand_Inlined_Call.Process_Formals).
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end Sem_Ch12;
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