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// Copyright 2020 The Chromium 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 MEDIA_BASE_USE_AFTER_FREE_CHECKER_H_
#define MEDIA_BASE_USE_AFTER_FREE_CHECKER_H_
#include "base/debug/dump_without_crashing.h"
#include "base/location.h"
#include "media/base/media_export.h"
namespace {
static base::debug::CrashKeyString* crash_key_string() {
static base::debug::CrashKeyString* string = nullptr;
if (!string) {
string = base::debug::AllocateCrashKeyString(
"use_after_free_checker", base::debug::CrashKeySize::Size32);
}
return string;
}
} // namespace
namespace media {
// Maintains a guard value from ctor => dtor, and causes a crash if it's ever
// found to be in an incorrect state. Includes a crash key that identifies
// whether itse use-after-free or corruption.
class MEDIA_EXPORT UseAfterFreeChecker {
public:
inline ~UseAfterFreeChecker() {
check();
state_ = State::kDestructed;
}
void check() {
if (state_ != State::kConstructed) {
base::debug::ScopedCrashKeyString scoped(
crash_key_string(),
state_ == State::kDestructed ? "destructed" : "corrupt");
CHECK(false);
}
}
private:
enum State : uint64_t {
kConstructed = 0x80C0FFEE,
kDestructed = 0xDEADC0DE,
};
// Declare this as an int rather than State, to avoid undefinedness if it gets
// overwritten with an arbitrary value.
uint64_t state_ = State::kConstructed;
};
} // namespace media
#endif // MEDIA_BASE_USE_AFTER_FREE_CHECKER_H_
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