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// Copyright 2015 The Chromium Authors
// 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 <memory>
#include "base/memory/ptr_util.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
#if BUILDFLAG(IS_CHROMEOS) && \
(defined(ARCH_CPU_X86_64) || defined(ARCH_CPU_ARM64))
#include "base/profiler/stack_copier_signal.h"
#include "base/profiler/thread_delegate_posix.h"
#endif
namespace base {
std::unique_ptr<StackSampler> StackSampler::Create(
SamplingProfilerThreadToken thread_token,
std::unique_ptr<StackUnwindData> stack_unwind_data,
UnwindersFactory core_unwinders_factory,
RepeatingClosure record_sample_callback,
StackSamplerTestDelegate* test_delegate) {
#if BUILDFLAG(IS_CHROMEOS) && \
(defined(ARCH_CPU_X86_64) || defined(ARCH_CPU_ARM64))
return base::WrapUnique(new StackSampler(
std::make_unique<StackCopierSignal>(
ThreadDelegatePosix::Create(thread_token)),
std::move(stack_unwind_data), std::move(core_unwinders_factory),
std::move(record_sample_callback), test_delegate));
#else
return nullptr;
#endif
}
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);
}
// Maximum limits under NPTL implementation.
constexpr size_t kDefaultStackLimit = 4 * (1 << 20);
return stack_size > 0 ? stack_size : kDefaultStackLimit;
}
} // namespace base