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// Copyright 2015 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 COMPONENTS_METRICS_LEAK_DETECTOR_CALL_STACK_TABLE_H_
#define COMPONENTS_METRICS_LEAK_DETECTOR_CALL_STACK_TABLE_H_
#include <stddef.h>
#include <stdint.h>
#include <functional> // For std::equal_to.
#include "base/containers/hash_tables.h"
#include "base/macros.h"
#include "components/metrics/leak_detector/custom_allocator.h"
#include "components/metrics/leak_detector/leak_analyzer.h"
#include "components/metrics/leak_detector/stl_allocator.h"
namespace metrics {
namespace leak_detector {
struct CallStack;
// Contains a hash table where the key is the call stack and the value is the
// number of allocations from that call stack.
// Not thread-safe.
class CallStackTable {
public:
struct StoredHash {
size_t operator()(const CallStack* call_stack) const;
};
explicit CallStackTable(int call_stack_suspicion_threshold);
~CallStackTable();
// Add/Remove an allocation for the given call stack.
// Note that this class does NOT own the CallStack objects. Instead, it
// identifies different CallStacks by their hashes.
void Add(const CallStack* call_stack);
void Remove(const CallStack* call_stack);
// Check for leak patterns in the allocation data.
void TestForLeaks();
const LeakAnalyzer& leak_analyzer() const { return leak_analyzer_; }
size_t size() const { return entry_map_.size(); }
bool empty() const { return entry_map_.empty(); }
uint32_t num_allocs() const { return num_allocs_; }
uint32_t num_frees() const { return num_frees_; }
private:
// Hash table entry used to track allocation stats for a given call stack.
struct Entry {
// Net number of allocs (allocs minus frees).
uint32_t net_num_allocs;
};
// Total number of allocs and frees in this table.
uint32_t num_allocs_;
uint32_t num_frees_;
// Hash table containing entries. Uses CustomAllocator to avoid recursive
// malloc hook invocation when analyzing allocs and frees.
using TableEntryAllocator =
STLAllocator<std::pair<const CallStack* const, Entry>, CustomAllocator>;
base::hash_map<const CallStack*,
Entry,
StoredHash,
std::equal_to<const CallStack*>,
TableEntryAllocator> entry_map_;
// For detecting leak patterns in incoming allocations.
LeakAnalyzer leak_analyzer_;
DISALLOW_COPY_AND_ASSIGN(CallStackTable);
};
} // namespace leak_detector
} // namespace metrics
#endif // COMPONENTS_METRICS_LEAK_DETECTOR_CALL_STACK_TABLE_H_
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