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| author | Richard Guenther <rguenther@suse.de> | 2010-10-05 10:37:12 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2010-10-05 10:37:12 +0000 |
| commit | 6e5723262255ea4d43d14d7c959e4dcc28cd01c3 (patch) | |
| tree | 05ebfcb5ef936e811e19a264334216b2b41c4b19 /gcc/gimple-fold.c | |
| parent | ce417b8f3fd61e8cbf0bc5cbedac464b009458d4 (diff) | |
| download | gcc-6e5723262255ea4d43d14d7c959e4dcc28cd01c3.zip gcc-6e5723262255ea4d43d14d7c959e4dcc28cd01c3.tar.gz gcc-6e5723262255ea4d43d14d7c959e4dcc28cd01c3.tar.bz2 | |
re PR middle-end/45877 (invalid write in gimplify_and_update_call_from_tree)
2010-10-05 Richard Guenther <rguenther@suse.de>
PR middle-end/45877
* gimple-fold.c (gimplify_and_update_call_from_tree): Handle
case where gimplification optimizes away the stmt.
* g++.dg/torture/pr45877.C: New testcase.
From-SVN: r164984
Diffstat (limited to 'gcc/gimple-fold.c')
| -rw-r--r-- | gcc/gimple-fold.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c index 0a6c746..d412eb2 100644 --- a/gcc/gimple-fold.c +++ b/gcc/gimple-fold.c @@ -932,7 +932,21 @@ gimplify_and_update_call_from_tree (gimple_stmt_iterator *si_p, tree expr) push_gimplify_context (&gctx); if (lhs == NULL_TREE) - gimplify_and_add (expr, &stmts); + { + gimplify_and_add (expr, &stmts); + /* We can end up with folding a memcpy of an empty class assignment + which gets optimized away by C++ gimplification. */ + if (gimple_seq_empty_p (stmts)) + { + if (gimple_in_ssa_p (cfun)) + { + unlink_stmt_vdef (stmt); + release_defs (stmt); + } + gsi_remove (si_p, true); + return; + } + } else tmp = get_initialized_tmp_var (expr, &stmts, NULL); |