// 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 "base/memory/ptr_util.h"
#include "base/profiler/stack_copier_suspend.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,
    std::unique_ptr<StackUnwindData> stack_unwind_data,
    UnwindersFactory core_unwinders_factory,
    RepeatingClosure record_sample_callback,
    StackSamplerTestDelegate* test_delegate) {
#if defined(ARCH_CPU_X86_64) || defined(ARCH_CPU_ARM64)
  return base::WrapUnique(new StackSampler(
      std::make_unique<StackCopierSuspend>(
          std::make_unique<SuspendableThreadDelegateWin>(thread_token)),
      std::move(stack_unwind_data), std::move(core_unwinders_factory),
      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