gcc/gcc11-pr98638.patch

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2021-01-19 13:36:34 +00:00
Since SSA names do leak into global tree data structures like
TYPE_SIZE or in this case GFC_DECL_SAVED_DESCRIPTOR because of
frontend bugs we have to be careful to wipe references to the
CFG when we deconstruct SSA form because we now do ggc_free that.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
2021-01-19 Richard Biener <rguenther@suse.de>
PR middle-end/98638
* tree-ssanames.c (fini_ssanames): Zero SSA_NAME_DEF_STMT.
--- gcc/tree-ssanames.c
+++ gcc/tree-ssanames.c
@@ -102,6 +102,14 @@ init_ssanames (struct function *fn, int size)
void
fini_ssanames (struct function *fn)
{
+ unsigned i;
+ tree name;
+ /* Some SSA names leak into global tree data structures so we can't simply
+ ggc_free them. But make sure to clear references to stmts since we now
+ ggc_free the CFG itself. */
+ FOR_EACH_VEC_SAFE_ELT (SSANAMES (fn), i, name)
+ if (name)
+ SSA_NAME_DEF_STMT (name) = NULL;
vec_free (SSANAMES (fn));
vec_free (FREE_SSANAMES (fn));
vec_free (FREE_SSANAMES_QUEUE (fn));