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