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re PR tree-optimization/38445 (ICE in tree-ssa-struct-alias when compiling grub-0.97)

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2008-12-09  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/38445
	* tree-ssa-structalias.c (emit_pointer_definition): Only visit
	names once.
	(emit_alias_warning): Adjust.

From-SVN: r142590
This commit is contained in:
Richard Guenther 2008-12-09 11:06:34 +00:00 committed by Richard Biener
parent 30da611174
commit b3b30b2401
2 changed files with 18 additions and 4 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2008-12-09 Richard Guenther <rguenther@suse.de>
PR tree-optimization/38445
* tree-ssa-structalias.c (emit_pointer_definition): Only visit
names once.
(emit_alias_warning): Adjust.
2008-12-09 Andrew Haley <aph@redhat.com>
* fixed-value.c (do_fixed_add): Add comment.

15
gcc/tree-ssa-structalias.c
View File

@ -4704,8 +4704,9 @@ static bool have_alias_info = false;
/* Emit a note for the pointer initialization point DEF. */
static void
emit_pointer_definition (gimple def)
emit_pointer_definition (tree ptr, bitmap visited)
{
gimple def = SSA_NAME_DEF_STMT (ptr);
if (gimple_code (def) == GIMPLE_PHI)
{
use_operand_p argp;
@ -4715,7 +4716,10 @@ emit_pointer_definition (gimple def)
{
tree arg = USE_FROM_PTR (argp);
if (TREE_CODE (arg) == SSA_NAME)
emit_pointer_definition (SSA_NAME_DEF_STMT (arg));
{
if (bitmap_set_bit (visited, SSA_NAME_VERSION (arg)))
emit_pointer_definition (arg, visited);
}
else
inform (0, "initialized from %qE", arg);
}
@ -4729,7 +4733,6 @@ emit_pointer_definition (gimple def)
static void
emit_alias_warning (tree ptr)
{
gimple def = SSA_NAME_DEF_STMT (ptr);
gimple use;
imm_use_iterator ui;
unsigned warned = 0;
@ -4777,7 +4780,11 @@ emit_alias_warning (tree ptr)
}
}
if (warned > 0)
emit_pointer_definition (def);
{
bitmap visited = BITMAP_ALLOC (NULL);
emit_pointer_definition (ptr, visited);
BITMAP_FREE (visited);
}
}
/* Given a pointer variable P, fill in its points-to set, or return