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// Copyright 2019 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.
#include "base/profiler/stack_sampler.h"
#include <pthread.h>
#include "base/check.h"
#include "base/profiler/stack_copier_signal.h"
#include "base/profiler/stack_sampler_impl.h"
#include "base/profiler/thread_delegate_posix.h"
#include "base/profiler/unwinder.h"
#include "base/threading/platform_thread.h"
namespace base {
std::unique_ptr<StackSampler> StackSampler::Create(
SamplingProfilerThreadToken thread_token,
ModuleCache* module_cache,
std::vector<std::unique_ptr<Unwinder>> core_unwinders,
StackSamplerTestDelegate* test_delegate) {
// |core_unwinders| must contain NativeUnwinderAndroid and
// ChromeUnwinderAndroid, respectively.
DCHECK_EQ(2U, core_unwinders.size());
return std::make_unique<StackSamplerImpl>(
std::make_unique<StackCopierSignal>(
std::make_unique<ThreadDelegatePosix>(thread_token)),
std::move(core_unwinders), module_cache, test_delegate);
}
size_t StackSampler::GetStackBufferSize() {
size_t stack_size = PlatformThread::GetDefaultThreadStackSize();
pthread_attr_t attr;
if (stack_size == 0 && pthread_attr_init(&attr) == 0) {
if (pthread_attr_getstacksize(&attr, &stack_size) != 0)
stack_size = 0;
pthread_attr_destroy(&attr);
}
// 1MB is default thread limit set by Android at art/runtime/thread_pool.h.
constexpr size_t kDefaultStackLimit = 1 << 20;
return stack_size > 0 ? stack_size : kDefaultStackLimit;
}
} // namespace base
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