object-poisoner.h

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// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef V8_HEAP_CPPGC_OBJECT_POISONER_H_
#define V8_HEAP_CPPGC_OBJECT_POISONER_H_
 
#include "src/base/sanitizer/asan.h"
#include "src/heap/cppgc/heap-object-header.h"
#include "src/heap/cppgc/heap-page.h"
#include "src/heap/cppgc/heap-visitor.h"
#include "src/heap/cppgc/object-view.h"
 
namespace cppgc {
namespace internal {
 
#ifdef V8_USE_ADDRESS_SANITIZER
 
// Poisons the payload of unmarked objects.
class UnmarkedObjectsPoisoner : public HeapVisitor<UnmarkedObjectsPoisoner> {
  friend class HeapVisitor<UnmarkedObjectsPoisoner>;
 
 private:
  bool VisitHeapObjectHeader(HeapObjectHeader& header) {
    if (header.IsFree() || header.IsMarked()) return true;
 
    ASAN_POISON_MEMORY_REGION(header.ObjectStart(),
                              ObjectView<>(header).Size());
    return true;
  }
};
 
#endif  // V8_USE_ADDRESS_SANITIZER
 
}  // namespace internal
}  // namespace cppgc
 
#endif  // V8_HEAP_CPPGC_OBJECT_POISONER_H_