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// Copyright (c) 2006-2008 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.
// MemoryWatcher.
// The MemoryWatcher is a library that can be linked into any
// win32 application. It will override the default memory allocators
// and track call stacks for any allocations that are made. It can
// then be used to see what memory is in use.
#ifndef TOOLS_MEMORY_WATCHER_MEMORY_WATCHER_
#define TOOLS_MEMORY_WATCHER_MEMORY_WATCHER_
#include <map>
#include <functional>
#include "base/lock.h"
#include "tools/memory_watcher/memory_hook.h"
class CallStack;
class AllocationStack;
// The MemoryWatcher installs allocation hooks and monitors
// allocations and frees.
class MemoryWatcher : MemoryObserver {
public:
struct StackTrack {
CallStack* stack;
int count;
int size;
};
typedef std::map<int32, AllocationStack*, std::less<int32>,
PrivateHookAllocator<int32> > CallStackMap;
typedef std::map<int32, StackTrack, std::less<int32>,
PrivateHookAllocator<int32> > CallStackIdMap;
typedef std::basic_string<char, std::char_traits<char>,
PrivateHookAllocator<char> > PrivateAllocatorString;
MemoryWatcher();
virtual ~MemoryWatcher();
// Dump all tracked pointers still in use.
void DumpLeaks();
// MemoryObserver interface.
virtual void OnTrack(HANDLE heap, int32 id, int32 size);
virtual void OnUntrack(HANDLE heap, int32 id, int32 size);
// Sets a name that appears in the generated file name.
void SetLogName(char* log_name);
private:
// Opens the logfile which we create.
void OpenLogFile();
// Close the logfile.
void CloseLogFile();
// Hook the memory hooks.
void Hook();
// Unhooks our memory hooks.
void Unhook();
// Check to see if this thread is already processing a block, and should not
// recurse.
bool LockedRecursionDetected() const;
// This is for logging.
FILE* file_;
bool hooked_; // True when this class has the memory_hooks hooked.
// Either 0, or else the threadID for a thread that is actively working on
// a stack track. Used to avoid recursive tracking.
DWORD active_thread_id_;
Lock block_map_lock_;
// The block_map provides quick lookups based on the allocation
// pointer. This is important for having fast round trips through
// malloc/free.
CallStackMap *block_map_;
// The file name for that log.
std::string file_name_;
// An optional name that appears in the log file name (used to differentiate
// logs).
std::string log_name_;
};
#endif // TOOLS_MEMORY_WATCHER_MEMORY_WATCHER_
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