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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TEST_MEMORY_DANGLING_PTR_INSTRUMENTATION_H_
#define BASE_TEST_MEMORY_DANGLING_PTR_INSTRUMENTATION_H_
#include <cstdint>
#include <string_view>
#include "base/memory/raw_ptr.h"
#include "base/types/expected.h"
#include "partition_alloc/dangling_raw_ptr_checks.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base::test {
// It is difficult to configure malloc as partition_alloc in death test and
// enable BackupRefPtr. This can be used as an alternative. This replaces a
// crash by incrementing a set of counters.
//
// Usage:
//
// ```cpp
// TEST(DanglingTest, Basic) {
// auto instrumentation = test::DanglingPtrInstrumentation::Create();
// if (!instrumentation.has_value()) {
// GTEST_SKIP() << instrumentation.error();
// }
//
// [...]
// EXPECT_EQ(instrumentation->dangling_ptr_detected(), 0u);
// EXPECT_EQ(instrumentation->dangling_ptr_released(), 0u);
// }
// ```
class DanglingPtrInstrumentation {
public:
// Returns the DanglingPtrInstrumentation or a reason why it can't be used,
// in which case the test should be skipped.
//
// This function should typically be called from the `testing::Test::SetUp()`
// override so that it can skip the test with `GTEST_SKIP()` on failure.
static base::expected<DanglingPtrInstrumentation, std::string_view> Create();
~DanglingPtrInstrumentation();
DanglingPtrInstrumentation(const DanglingPtrInstrumentation&) = delete;
DanglingPtrInstrumentation(DanglingPtrInstrumentation&&);
DanglingPtrInstrumentation& operator=(const DanglingPtrInstrumentation&) =
delete;
DanglingPtrInstrumentation& operator=(DanglingPtrInstrumentation&&);
size_t dangling_ptr_detected() { return dangling_ptr_detected_; }
size_t dangling_ptr_released() { return dangling_ptr_released_; }
private:
static void IncreaseCountDetected(std::uintptr_t);
static void IncreaseCountReleased(std::uintptr_t);
static raw_ptr<DanglingPtrInstrumentation> g_observer;
DanglingPtrInstrumentation();
void Register();
void Unregister();
size_t dangling_ptr_detected_ = 0;
size_t dangling_ptr_released_ = 0;
partition_alloc::DanglingRawPtrDetectedFn* old_detected_fn_ = nullptr;
partition_alloc::DanglingRawPtrReleasedFn* old_dereferenced_fn_ = nullptr;
};
} // namespace base::test
#endif // BASE_TEST_MEMORY_DANGLING_PTR_INSTRUMENTATION_H_
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