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// Copyright 2015 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 "base/bind.h"
#include "base/check.h"
#include "base/profiler/native_unwinder_win.h"
#include "base/profiler/stack_copier_suspend.h"
#include "base/profiler/stack_sampler_impl.h"
#include "base/profiler/suspendable_thread_delegate_win.h"
#include "build/build_config.h"
namespace base {
// static
std::unique_ptr<StackSampler> StackSampler::Create(
SamplingProfilerThreadToken thread_token,
ModuleCache* module_cache,
UnwindersFactory core_unwinders_factory,
RepeatingClosure record_sample_callback,
StackSamplerTestDelegate* test_delegate) {
DCHECK(!core_unwinders_factory);
#if defined(ARCH_CPU_X86_64) || defined(ARCH_CPU_ARM64)
const auto create_unwinders = []() {
std::vector<std::unique_ptr<Unwinder>> unwinders;
unwinders.push_back(std::make_unique<NativeUnwinderWin>());
return unwinders;
};
return std::make_unique<StackSamplerImpl>(
std::make_unique<StackCopierSuspend>(
std::make_unique<SuspendableThreadDelegateWin>(thread_token)),
BindOnce(create_unwinders), module_cache,
std::move(record_sample_callback), test_delegate);
#else
return nullptr;
#endif
}
// static
size_t StackSampler::GetStackBufferSize() {
// The default Win32 reserved stack size is 1 MB and Chrome Windows threads
// currently always use the default, but this allows for expansion if it
// occurs. The size beyond the actual stack size consists of unallocated
// virtual memory pages so carries little cost (just a bit of wasted address
// space).
return 2 << 20; // 2 MiB
}
} // namespace base
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