46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
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/* Test for constant expressions: details of what is a null pointer
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constant.
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*/
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/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
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/* { dg-do compile } */
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/* { dg-options "-std=iso9899:1999" } */
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/* Note: not using -pedantic since the -std option alone should be enough
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to give the correct behavior to conforming programs. If -pedantic is
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needed to make (say) (0, 0) not be a constant expression, this is a
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bug.
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*/
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int *a;
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int b;
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long *c;
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#if defined(_LP64)
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#define ZERO 0L
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#elif defined(_WIN64)
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#define ZERO 0LL
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#else
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#define ZERO 0
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#endif
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/* Assertion that n is a null pointer constant: so the conditional expression
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has type 'int *' instead of 'void *'.
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*/
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#define ASSERT_NPC(n) (b = *(1 ? a : (n)))
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/* Assertion that n is not a null pointer constant: so the conditional
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expressions has type 'void *' instead of 'int *'.
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*/
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#define ASSERT_NOT_NPC(n) (c = (1 ? a : (n)))
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void
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foo (void)
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{
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ASSERT_NPC (0);
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ASSERT_NPC ((void *)0);
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ASSERT_NOT_NPC ((void *)(void *)0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
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ASSERT_NOT_NPC ((void *)(char *)0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
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ASSERT_NOT_NPC ((void *)(0, ZERO)); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
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ASSERT_NOT_NPC ((void *)(&"Foobar"[0] - &"Foobar"[0])); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
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/* This last one is a null pointer constant in C99 only. */
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ASSERT_NPC ((void *)(1 ? 0 : (0, 0)));
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}
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