gcc/gcc7-pr81929.patch

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2017-09-15 10:38:59 +00:00
2017-09-14 Jakub Jelinek <jakub@redhat.com>
PR sanitizer/81929
* tree.c (struct replace_placeholders_t): Add pset field.
(replace_placeholders_r): Call cp_walk_tree with d->pset as
last argument instead of NULL. Formatting fix.
(replace_placeholders): Add pset variable, add its address
into data. Pass &pset instead of NULL to cp_walk_tree.
* g++.dg/ubsan/pr81929.C: New test.
--- gcc/cp/tree.c.jj 2017-09-12 09:35:47.000000000 +0200
+++ gcc/cp/tree.c 2017-09-14 17:38:07.717064412 +0200
@@ -3063,6 +3063,7 @@ struct replace_placeholders_t
{
tree obj; /* The object to be substituted for a PLACEHOLDER_EXPR. */
bool seen; /* Whether we've encountered a PLACEHOLDER_EXPR. */
+ hash_set<tree> *pset; /* To avoid walking same trees multiple times. */
};
/* Like substitute_placeholder_in_expr, but handle C++ tree codes and
@@ -3085,8 +3086,8 @@ replace_placeholders_r (tree* t, int* wa
case PLACEHOLDER_EXPR:
{
tree x = obj;
- for (; !(same_type_ignoring_top_level_qualifiers_p
- (TREE_TYPE (*t), TREE_TYPE (x)));
+ for (; !same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (*t),
+ TREE_TYPE (x));
x = TREE_OPERAND (x, 0))
gcc_assert (TREE_CODE (x) == COMPONENT_REF);
*t = x;
@@ -3118,8 +3119,7 @@ replace_placeholders_r (tree* t, int* wa
valp = &TARGET_EXPR_INITIAL (*valp);
}
d->obj = subob;
- cp_walk_tree (valp, replace_placeholders_r,
- data_, NULL);
+ cp_walk_tree (valp, replace_placeholders_r, data_, d->pset);
d->obj = obj;
}
*walk_subtrees = false;
@@ -3151,10 +3151,11 @@ replace_placeholders (tree exp, tree obj
return exp;
tree *tp = &exp;
- replace_placeholders_t data = { obj, false };
+ hash_set<tree> pset;
+ replace_placeholders_t data = { obj, false, &pset };
if (TREE_CODE (exp) == TARGET_EXPR)
tp = &TARGET_EXPR_INITIAL (exp);
- cp_walk_tree (tp, replace_placeholders_r, &data, NULL);
+ cp_walk_tree (tp, replace_placeholders_r, &data, &pset);
if (seen_p)
*seen_p = data.seen;
return exp;
--- gcc/testsuite/g++.dg/ubsan/pr81929.C.jj 2017-09-14 17:48:09.052611540 +0200
+++ gcc/testsuite/g++.dg/ubsan/pr81929.C 2017-09-14 17:49:21.644711332 +0200
@@ -0,0 +1,14 @@
+// PR sanitizer/81929
+// { dg-do compile }
+// { dg-options "-std=c++14 -fsanitize=undefined" }
+
+struct S { S &operator<< (long); S foo (); S (); };
+
+void
+bar ()
+{
+ static_cast<S&>(S () << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0
+ << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0
+ << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0
+ << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0 << 0).foo ();
+}