procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

re PR tree-optimization/18307 (merge_pointed_to_info called incorrectly)

Browse source 
PR tree-optimization/18307
	* tree-ssa-alias.c (merge_pointed_to_info): Protected against DEST
	and ORIG being the same node.

From-SVN: r90120
This commit is contained in:
Nathan Sidwell 2004-11-05 10:56:01 +00:00 • committed by Nathan Sidwell
parent 6866abb815
commit 0cde4a2c32
2 changed files with 17 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
gcc/ChangeLog
View file

@ -1,3 +1,9 @@
2004-11-05 Nathan Sidwell <nathan@codesourcery.com>
PR tree-optimization/18307
* tree-ssa-alias.c (merge_pointed_to_info): Protected against DEST
and ORIG being the same node.
2004-11-04 Geoffrey Keating <geoffk@apple.com>
* Makefile.in (distclean): Don't delete nonexistent fixinc/ directory.

13
gcc/tree-ssa-alias.c
View file

@ -1687,14 +1687,21 @@ set_pt_malloc (tree ptr)
}
/* Given two pointers DEST and ORIG. Merge the points-to information in
ORIG into DEST. AI is as in collect_points_to_info. */
/* Given two different pointers DEST and ORIG. Merge the points-to
information in ORIG into DEST. AI is as in
collect_points_to_info. */
static void
merge_pointed_to_info (struct alias_info *ai, tree dest, tree orig)
{
struct ptr_info_def *dest_pi, *orig_pi;
/* FIXME: It is erroneous to call this function with identical
nodes, however that currently occurs during bootstrap. This check
stops further breakage. PR 18307 documents the issue. */
if (dest == orig)
return;
/* Make sure we have points-to information for ORIG. */
collect_points_to_info_for (ai, orig);
@ -1725,6 +1732,8 @@ merge_pointed_to_info (struct alias_info *ai, tree dest, tree orig)
smart enough to determine that the two come from the same
malloc call. Copy propagation before aliasing should cure
this. */
gcc_assert (orig_pi != dest_pi);
dest_pi->pt_malloc = 0;
if (orig_pi->pt_malloc || orig_pi->pt_anything)