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Diffstat (limited to 'gcc/tree-iterator.c')
| -rw-r--r-- | gcc/tree-iterator.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/tree-iterator.c b/gcc/tree-iterator.c index c4c30104731..ad2b47ea8cd 100644 --- a/gcc/tree-iterator.c +++ b/gcc/tree-iterator.c @@ -40,6 +40,7 @@ alloc_stmt_list (void) if (list) { stmt_list_cache = TREE_CHAIN (list); + gcc_assert (stmt_list_cache != list); memset (list, 0, sizeof(struct tree_common)); TREE_SET_CODE (list, STATEMENT_LIST); } @@ -54,6 +55,9 @@ free_stmt_list (tree t) { gcc_assert (!STATEMENT_LIST_HEAD (t)); gcc_assert (!STATEMENT_LIST_TAIL (t)); + /* If this triggers, it's a sign that the same list is being freed + twice. */ + gcc_assert (t != stmt_list_cache || stmt_list_cache == NULL); TREE_CHAIN (t) = stmt_list_cache; stmt_list_cache = t; } |