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ubsan.c (ubsan_type_descriptor): If varpool_get_node returns NULL for a decl, recreate that decl.

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2013-11-27  Marek Polacek  <polacek@redhat.com>

	* ubsan.c (ubsan_type_descriptor): If varpool_get_node returns NULL
	for a decl, recreate that decl.  Save into the hash table VAR_DECLs
	rather than ADDR_EXPRs.
testsuite/
	* c-c++-common/ubsan/undefined-1.c: New test.

From-SVN: r205433
This commit is contained in:
Marek Polacek 2013-11-27 08:02:48 +00:00 committed by Marek Polacek
parent 199299e8e5
commit 14a981b922
4 changed files with 44 additions and 5 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2013-11-27 Marek Polacek <polacek@redhat.com>
* ubsan.c (ubsan_type_descriptor): If varpool_get_node returns NULL
for a decl, recreate that decl. Save into the hash table VAR_DECLs
rather than ADDR_EXPRs.
2013-11-27 Alexander Ivchenko <alexander.ivchenko@intel.com>
* config/ia64/hpux.h (TARGET_LIBC_HAS_FUNCTION): Fix typo.

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2013-11-27 Marek Polacek <polacek@redhat.com>
* c-c++-common/ubsan/undefined-1.c: New test.
2013-11-26 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/59014

26
gcc/testsuite/c-c++-common/ubsan/undefined-1.c Normal file
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@ -0,0 +1,26 @@
/* { dg-do run } */
/* { dg-options "-fsanitize=undefined" } */
/* { dg-skip-if "" { *-*-* } { "-flto" } { "" } } */
int
foo (int x, int y)
{
const int z = 2;
if (z & 1)
return x << y;
return 0;
}
int
bar (int x, int y)
{
return x + y;
}
int
main (void)
{
foo (3, 2);
bar (12, 42);
return 0;
}

13
gcc/ubsan.c
View File

@ -272,8 +272,12 @@ ubsan_type_descriptor (tree type, bool want_pointer_type_p)
type = TYPE_MAIN_VARIANT (type);
tree decl = decl_for_type_lookup (type);
if (decl != NULL_TREE)
return decl;
/* It is possible that some of the earlier created DECLs were found
unused, in that case they weren't emitted and varpool_get_node
returns NULL node on them. But now we really need them. Thus,
renew them here. */
if (decl != NULL_TREE && varpool_get_node (decl))
return build_fold_addr_expr (decl);
tree dtype = ubsan_type_descriptor_type ();
tree type2 = type;
@ -372,11 +376,10 @@ ubsan_type_descriptor (tree type, bool want_pointer_type_p)
DECL_INITIAL (decl) = ctor;
rest_of_decl_compilation (decl, 1, 0);
/* Save the address of the VAR_DECL into the hash table. */
decl = build_fold_addr_expr (decl);
/* Save the VAR_DECL into the hash table. */
decl_for_type_insert (type, decl);
return decl;
return build_fold_addr_expr (decl);
}
/* Create a structure for the ubsan library. NAME is a name of the new