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backport: tree-object-size.c (pass_through_call): Do not handle BUILT_IN_STPNCPY_CHK which is not a pass through call.

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Backported from mainline
	2017-11-24  Jakub Jelinek  <jakub@redhat.com>

	* tree-object-size.c (pass_through_call): Do not handle
	BUILT_IN_STPNCPY_CHK which is not a pass through call.

	* gcc.dg/builtin-object-size-18.c: New test.

From-SVN: r255714
This commit is contained in:
Jakub Jelinek 2017-12-15 22:57:19 +01:00 committed by Jakub Jelinek
parent 7c11fb2820
commit 5a8687cc52
4 changed files with 24 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,6 +1,11 @@
2017-12-15 Jakub Jelinek <jakub@redhat.com>
Backported from mainline
2017-11-24 Jakub Jelinek <jakub@redhat.com>
* tree-object-size.c (pass_through_call): Do not handle
BUILT_IN_STPNCPY_CHK which is not a pass through call.
2017-11-23 Jakub Jelinek <jakub@redhat.com>
PR middle-end/82253

4
gcc/testsuite/ChangeLog
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@ -1,6 +1,10 @@
2017-12-15 Jakub Jelinek <jakub@redhat.com>
Backported from mainline
2017-11-24 Jakub Jelinek <jakub@redhat.com>
* gcc.dg/builtin-object-size-18.c: New test.
2017-11-23 Jakub Jelinek <jakub@redhat.com>
PR middle-end/82253

15
gcc/testsuite/gcc.dg/builtin-object-size-18.c Normal file
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@ -0,0 +1,15 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
/* __stpncpy_chk could return buf up to buf + 64, so
the minimum object size might be far smaller than 64. */
/* { dg-final { scan-tree-dump-not "return 64;" "optimized" } } */
typedef __SIZE_TYPE__ size_t;
size_t
foo (const char *p, size_t s, size_t t)
{
char buf[64];
char *q = __builtin___stpncpy_chk (buf, p, s, t);
return __builtin_object_size (q, 2);
}

1
gcc/tree-object-size.c
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@ -481,7 +481,6 @@ pass_through_call (const gcall *call)
case BUILT_IN_MEMSET_CHK:
case BUILT_IN_STRCPY_CHK:
case BUILT_IN_STRNCPY_CHK:
case BUILT_IN_STPNCPY_CHK:
case BUILT_IN_STRCAT_CHK:
case BUILT_IN_STRNCAT_CHK:
case BUILT_IN_ASSUME_ALIGNED: