1// Copyright 2021 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_HEAP_CPPGC_OBJECT_POISONER_H_
6#define V8_HEAP_CPPGC_OBJECT_POISONER_H_
7
8#include "src/base/sanitizer/asan.h"
9#include "src/heap/cppgc/heap-object-header.h"
10#include "src/heap/cppgc/heap-page.h"
11#include "src/heap/cppgc/heap-visitor.h"
12#include "src/heap/cppgc/object-view.h"
13
14namespace cppgc {
15namespace internal {
16
17#ifdef V8_USE_ADDRESS_SANITIZER
18
19// Poisons the payload of unmarked objects.
20class UnmarkedObjectsPoisoner : public HeapVisitor<UnmarkedObjectsPoisoner> {
21  friend class HeapVisitor<UnmarkedObjectsPoisoner>;
22
23 private:
24  bool VisitHeapObjectHeader(HeapObjectHeader& header) {
25    if (header.IsFree() || header.IsMarked()) return true;
26
27    ASAN_POISON_MEMORY_REGION(header.ObjectStart(),
28                              ObjectView<>(header).Size());
29    return true;
30  }
31};
32
33#endif  // V8_USE_ADDRESS_SANITIZER
34
35}  // namespace internal
36}  // namespace cppgc
37
38#endif  // V8_HEAP_CPPGC_OBJECT_POISONER_H_
39