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// Copyright (c) 2012, Google Inc.
// 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// 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.
// ---
// Author: Sanjay Ghemawat <opensource@google.com>
#include <config.h>
#include <assert.h>
#include <string.h>
#include <stdio.h>
#if defined HAVE_STDINT_H
#include <stdint.h>
#elif defined HAVE_INTTYPES_H
#include <inttypes.h>
#else
#include <sys/types.h>
#endif
#include <string>
#include "base/dynamic_annotations.h"
#include "base/sysinfo.h" // for FillProcSelfMaps
#ifndef NO_HEAP_CHECK
#include "gperftools/heap-checker.h"
#endif
#include "gperftools/malloc_extension.h"
#include "gperftools/malloc_extension_c.h"
#include "maybe_threads.h"
#ifdef USE_TCMALLOC
// Note that malloc_extension can be used without tcmalloc if gperftools'
// heap-profiler is enabled without the tcmalloc memory allocator.
#include "thread_cache.h"
#endif
using STL_NAMESPACE::string;
using STL_NAMESPACE::vector;
static void DumpAddressMap(string* result) {
*result += "\nMAPPED_LIBRARIES:\n";
// We keep doubling until we get a fit
const size_t old_resultlen = result->size();
for (int amap_size = 10240; amap_size < 10000000; amap_size *= 2) {
result->resize(old_resultlen + amap_size);
bool wrote_all = false;
const int bytes_written =
tcmalloc::FillProcSelfMaps(&((*result)[old_resultlen]), amap_size,
&wrote_all);
if (wrote_all) { // we fit!
(*result)[old_resultlen + bytes_written] = '\0';
result->resize(old_resultlen + bytes_written);
return;
}
}
result->reserve(old_resultlen); // just don't print anything
}
// Note: this routine is meant to be called before threads are spawned.
void MallocExtension::Initialize() {
static bool initialize_called = false;
if (initialize_called) return;
initialize_called = true;
#ifdef __GLIBC__
// GNU libc++ versions 3.3 and 3.4 obey the environment variables
// GLIBCPP_FORCE_NEW and GLIBCXX_FORCE_NEW respectively. Setting
// one of these variables forces the STL default allocator to call
// new() or delete() for each allocation or deletion. Otherwise
// the STL allocator tries to avoid the high cost of doing
// allocations by pooling memory internally. However, tcmalloc
// does allocations really fast, especially for the types of small
// items one sees in STL, so it's better off just using us.
// TODO: control whether we do this via an environment variable?
setenv("GLIBCPP_FORCE_NEW", "1", false /* no overwrite*/);
setenv("GLIBCXX_FORCE_NEW", "1", false /* no overwrite*/);
// Now we need to make the setenv 'stick', which it may not do since
// the env is flakey before main() is called. But luckily stl only
// looks at this env var the first time it tries to do an alloc, and
// caches what it finds. So we just cause an stl alloc here.
string dummy("I need to be allocated");
dummy += "!"; // so the definition of dummy isn't optimized out
#endif /* __GLIBC__ */
}
// SysAllocator implementation
SysAllocator::~SysAllocator() {}
// Default implementation -- does nothing
MallocExtension::~MallocExtension() { }
bool MallocExtension::VerifyAllMemory() { return true; }
bool MallocExtension::VerifyNewMemory(const void* p) { return true; }
bool MallocExtension::VerifyArrayNewMemory(const void* p) { return true; }
bool MallocExtension::VerifyMallocMemory(const void* p) { return true; }
bool MallocExtension::GetNumericProperty(const char* property, size_t* value) {
return false;
}
bool MallocExtension::SetNumericProperty(const char* property, size_t value) {
return false;
}
void MallocExtension::GetStats(char* buffer, int length) {
assert(length > 0);
buffer[0] = '\0';
}
bool MallocExtension::MallocMemoryStats(int* blocks, size_t* total,
int histogram[kMallocHistogramSize]) {
*blocks = 0;
*total = 0;
memset(histogram, 0, sizeof(*histogram) * kMallocHistogramSize);
return true;
}
void** MallocExtension::ReadStackTraces(int* sample_period) {
return NULL;
}
void** MallocExtension::ReadHeapGrowthStackTraces() {
return NULL;
}
void MallocExtension::MarkThreadIdle() {
// Default implementation does nothing
}
void MallocExtension::MarkThreadBusy() {
// Default implementation does nothing
}
SysAllocator* MallocExtension::GetSystemAllocator() {
return NULL;
}
void MallocExtension::SetSystemAllocator(SysAllocator *a) {
// Default implementation does nothing
}
void MallocExtension::ReleaseToSystem(size_t num_bytes) {
// Default implementation does nothing
}
void MallocExtension::ReleaseFreeMemory() {
ReleaseToSystem(static_cast<size_t>(-1)); // SIZE_T_MAX
}
void MallocExtension::SetMemoryReleaseRate(double rate) {
// Default implementation does nothing
}
double MallocExtension::GetMemoryReleaseRate() {
return -1.0;
}
size_t MallocExtension::GetEstimatedAllocatedSize(size_t size) {
return size;
}
size_t MallocExtension::GetAllocatedSize(const void* p) {
assert(GetOwnership(p) != kNotOwned);
return 0;
}
MallocExtension::Ownership MallocExtension::GetOwnership(const void* p) {
return kUnknownOwnership;
}
void MallocExtension::GetFreeListSizes(
vector<MallocExtension::FreeListInfo>* v) {
v->clear();
}
// The current malloc extension object.
static pthread_once_t module_init = PTHREAD_ONCE_INIT;
static MallocExtension* current_instance = NULL;
static void InitModule() {
current_instance = new MallocExtension;
#ifndef NO_HEAP_CHECK
HeapLeakChecker::IgnoreObject(current_instance);
#endif
}
MallocExtension* MallocExtension::instance() {
perftools_pthread_once(&module_init, InitModule);
return current_instance;
}
void MallocExtension::Register(MallocExtension* implementation) {
perftools_pthread_once(&module_init, InitModule);
// When running under valgrind, our custom malloc is replaced with
// valgrind's one and malloc extensions will not work. (Note:
// callers should be responsible for checking that they are the
// malloc that is really being run, before calling Register. This
// is just here as an extra sanity check.)
if (!RunningOnValgrind()) {
current_instance = implementation;
}
}
unsigned int MallocExtension::GetBytesAllocatedOnCurrentThread() {
// This function is added in Chromium for profiling.
#ifdef USE_TCMALLOC
// Note that malloc_extension can be used without tcmalloc if gperftools'
// heap-profiler is enabled without the tcmalloc memory allocator.
return tcmalloc::ThreadCache::GetBytesAllocatedOnCurrentThread();
#else
return 0;
#endif
}
// -----------------------------------------------------------------------
// Heap sampling support
// -----------------------------------------------------------------------
namespace {
// Accessors
uintptr_t Count(void** entry) {
return reinterpret_cast<uintptr_t>(entry[0]);
}
uintptr_t Size(void** entry) {
return reinterpret_cast<uintptr_t>(entry[1]);
}
uintptr_t Depth(void** entry) {
return reinterpret_cast<uintptr_t>(entry[2]);
}
void* PC(void** entry, int i) {
return entry[3+i];
}
void PrintCountAndSize(MallocExtensionWriter* writer,
uintptr_t count, uintptr_t size) {
char buf[100];
snprintf(buf, sizeof(buf),
"%6" PRIu64 ": %8" PRIu64 " [%6" PRIu64 ": %8" PRIu64 "] @",
static_cast<uint64>(count),
static_cast<uint64>(size),
static_cast<uint64>(count),
static_cast<uint64>(size));
writer->append(buf, strlen(buf));
}
void PrintHeader(MallocExtensionWriter* writer,
const char* label, void** entries) {
// Compute the total count and total size
uintptr_t total_count = 0;
uintptr_t total_size = 0;
for (void** entry = entries; Count(entry) != 0; entry += 3 + Depth(entry)) {
total_count += Count(entry);
total_size += Size(entry);
}
const char* const kTitle = "heap profile: ";
writer->append(kTitle, strlen(kTitle));
PrintCountAndSize(writer, total_count, total_size);
writer->append(" ", 1);
writer->append(label, strlen(label));
writer->append("\n", 1);
}
void PrintStackEntry(MallocExtensionWriter* writer, void** entry) {
PrintCountAndSize(writer, Count(entry), Size(entry));
for (int i = 0; i < Depth(entry); i++) {
char buf[32];
snprintf(buf, sizeof(buf), " %p", PC(entry, i));
writer->append(buf, strlen(buf));
}
writer->append("\n", 1);
}
}
void MallocExtension::GetHeapSample(MallocExtensionWriter* writer) {
int sample_period = 0;
void** entries = ReadStackTraces(&sample_period);
if (entries == NULL) {
const char* const kErrorMsg =
"This malloc implementation does not support sampling.\n"
"As of 2005/01/26, only tcmalloc supports sampling, and\n"
"you are probably running a binary that does not use\n"
"tcmalloc.\n";
writer->append(kErrorMsg, strlen(kErrorMsg));
return;
}
char label[32];
sprintf(label, "heap_v2/%d", sample_period);
PrintHeader(writer, label, entries);
for (void** entry = entries; Count(entry) != 0; entry += 3 + Depth(entry)) {
PrintStackEntry(writer, entry);
}
delete[] entries;
DumpAddressMap(writer);
}
void MallocExtension::GetHeapGrowthStacks(MallocExtensionWriter* writer) {
void** entries = ReadHeapGrowthStackTraces();
if (entries == NULL) {
const char* const kErrorMsg =
"This malloc implementation does not support "
"ReadHeapGrowthStackTraces().\n"
"As of 2005/09/27, only tcmalloc supports this, and you\n"
"are probably running a binary that does not use tcmalloc.\n";
writer->append(kErrorMsg, strlen(kErrorMsg));
return;
}
// Do not canonicalize the stack entries, so that we get a
// time-ordered list of stack traces, which may be useful if the
// client wants to focus on the latest stack traces.
PrintHeader(writer, "growth", entries);
for (void** entry = entries; Count(entry) != 0; entry += 3 + Depth(entry)) {
PrintStackEntry(writer, entry);
}
delete[] entries;
DumpAddressMap(writer);
}
void MallocExtension::Ranges(void* arg, RangeFunction func) {
// No callbacks by default
}
// These are C shims that work on the current instance.
#define C_SHIM(fn, retval, paramlist, arglist) \
extern "C" PERFTOOLS_DLL_DECL retval MallocExtension_##fn paramlist { \
return MallocExtension::instance()->fn arglist; \
}
C_SHIM(VerifyAllMemory, int, (void), ());
C_SHIM(VerifyNewMemory, int, (const void* p), (p));
C_SHIM(VerifyArrayNewMemory, int, (const void* p), (p));
C_SHIM(VerifyMallocMemory, int, (const void* p), (p));
C_SHIM(MallocMemoryStats, int,
(int* blocks, size_t* total, int histogram[kMallocHistogramSize]),
(blocks, total, histogram));
C_SHIM(GetStats, void,
(char* buffer, int buffer_length), (buffer, buffer_length));
C_SHIM(GetNumericProperty, int,
(const char* property, size_t* value), (property, value));
C_SHIM(SetNumericProperty, int,
(const char* property, size_t value), (property, value));
C_SHIM(MarkThreadIdle, void, (void), ());
C_SHIM(MarkThreadBusy, void, (void), ());
C_SHIM(ReleaseFreeMemory, void, (void), ());
C_SHIM(ReleaseToSystem, void, (size_t num_bytes), (num_bytes));
C_SHIM(GetEstimatedAllocatedSize, size_t, (size_t size), (size));
C_SHIM(GetAllocatedSize, size_t, (const void* p), (p));
// Can't use the shim here because of the need to translate the enums.
extern "C"
MallocExtension_Ownership MallocExtension_GetOwnership(const void* p) {
return static_cast<MallocExtension_Ownership>(
MallocExtension::instance()->GetOwnership(p));
}