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| author | Richard Biener <rguenther@suse.de> | 2021-01-19 13:40:39 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2021-01-19 14:32:14 +0100 |
| commit | f27cd6f42261e838677dfd0652f09cc0dfd6a42b (patch) | |
| tree | 8e8a1608e48684b277f7097720aff9af0e649efc | |
| parent | 4b690f161b82e428dbe648075da215daa52be0ea (diff) | |
| download | gcc-f27cd6f42261e838677dfd0652f09cc0dfd6a42b.zip gcc-f27cd6f42261e838677dfd0652f09cc0dfd6a42b.tar.gz gcc-f27cd6f42261e838677dfd0652f09cc0dfd6a42b.tar.bz2 | |
middle-end/98638 - avoid SSA reference to stmts after SSA deconstruction
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.
2021-01-19 Richard Biener <rguenther@suse.de>
PR middle-end/98638
* tree-ssanames.c (fini_ssanames): Zero SSA_NAME_DEF_STMT.
| -rw-r--r-- | gcc/tree-ssanames.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/tree-ssanames.c b/gcc/tree-ssanames.c index c293cc4..51a26d2 100644 --- a/gcc/tree-ssanames.c +++ b/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)); |