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/*
* Copyright (C) 2015 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#pragma once
#include <stdint.h>
#include <stdio.h>
#include <atomic>
#include <deque>
#include <mutex>
#include <string>
#include <unordered_map>
#include <vector>
#include <private/bionic_macros.h>
#include <unwindstack/LocalUnwinder.h>
#include "OptionData.h"
#include "UnwindBacktrace.h"
extern int* g_malloc_zygote_child;
// Forward declarations.
class Config;
struct FrameKeyType {
size_t num_frames;
uintptr_t* frames;
bool operator==(const FrameKeyType& comp) const {
if (num_frames != comp.num_frames) return false;
for (size_t i = 0; i < num_frames; i++) {
if (frames[i] != comp.frames[i]) {
return false;
}
}
return true;
}
};
namespace std {
template <>
struct hash<FrameKeyType> {
std::size_t operator()(const FrameKeyType& key) const {
std::size_t cur_hash = key.frames[0];
// Limit the number of frames to speed up hashing.
size_t max_frames = (key.num_frames > 5) ? 5 : key.num_frames;
for (size_t i = 1; i < max_frames; i++) {
cur_hash ^= key.frames[i];
}
return cur_hash;
}
};
}; // namespace std
struct FrameInfoType {
size_t references = 0;
std::vector<uintptr_t> frames;
};
struct PointerInfoType {
size_t size;
size_t hash_index;
size_t RealSize() const { return size & ~(1U << 31); }
bool ZygoteChildAlloc() const { return size & (1U << 31); }
static size_t GetEncodedSize(size_t size) { return GetEncodedSize(*g_malloc_zygote_child, size); }
static size_t GetEncodedSize(bool child_alloc, size_t size) {
return size | ((child_alloc) ? (1U << 31) : 0);
}
static size_t MaxSize() { return (1U << 31) - 1; }
};
struct FreePointerInfoType {
uintptr_t pointer;
size_t hash_index;
};
struct ListInfoType {
uintptr_t pointer;
size_t num_allocations;
size_t size;
bool zygote_child_alloc;
FrameInfoType* frame_info;
std::vector<unwindstack::LocalFrameData>* backtrace_info;
};
class PointerData : public OptionData {
public:
explicit PointerData(DebugData* debug_data);
virtual ~PointerData() = default;
bool Initialize(const Config& config);
inline size_t alloc_offset() { return alloc_offset_; }
bool ShouldBacktrace() { return backtrace_enabled_ == 1; }
void ToggleBacktraceEnabled() { backtrace_enabled_.fetch_xor(1); }
void EnableDumping() { backtrace_dump_ = true; }
bool ShouldDumpAndReset() {
bool expected = true;
return backtrace_dump_.compare_exchange_strong(expected, false);
}
void PrepareFork();
void PostForkParent();
void PostForkChild();
static size_t AddBacktrace(size_t num_frames);
static void RemoveBacktrace(size_t hash_index);
static void Add(const void* pointer, size_t size);
static void Remove(const void* pointer);
typedef std::unordered_map<uintptr_t, PointerInfoType>::iterator iterator;
static iterator begin() { return pointers_.begin(); }
static iterator end() { return pointers_.end(); }
static void* AddFreed(const void* pointer);
static void LogFreeError(const FreePointerInfoType& info, size_t usable_size);
static void LogFreeBacktrace(const void* ptr);
static void VerifyFreedPointer(const FreePointerInfoType& info);
static void VerifyAllFreed();
static void GetAllocList(std::vector<ListInfoType>* list);
static void LogLeaks();
static void DumpLiveToFile(FILE* fp);
static void GetInfo(uint8_t** info, size_t* overall_size, size_t* info_size, size_t* total_memory,
size_t* backtrace_size);
static size_t GetFrames(const void* pointer, uintptr_t* frames, size_t max_frames);
static bool Exists(const void* pointer);
private:
static std::string GetHashString(uintptr_t* frames, size_t num_frames);
static void LogBacktrace(size_t hash_index);
static void GetList(std::vector<ListInfoType>* list, bool only_with_backtrace);
static void GetUniqueList(std::vector<ListInfoType>* list, bool only_with_backtrace);
size_t alloc_offset_ = 0;
std::vector<uint8_t> cmp_mem_;
static std::atomic_uint8_t backtrace_enabled_;
static std::atomic_bool backtrace_dump_;
static std::mutex pointer_mutex_;
static std::unordered_map<uintptr_t, PointerInfoType> pointers_;
static std::mutex frame_mutex_;
static std::unordered_map<FrameKeyType, size_t> key_to_index_;
static std::unordered_map<size_t, FrameInfoType> frames_;
static std::unordered_map<size_t, std::vector<unwindstack::LocalFrameData>> backtraces_info_;
static size_t cur_hash_index_;
static std::mutex free_pointer_mutex_;
static std::deque<FreePointerInfoType> free_pointers_;
BIONIC_DISALLOW_COPY_AND_ASSIGN(PointerData);
};
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