Revert of Temporary commit to evaluate perf impact of prototype CPU profiler

base/profiler/cpu_profiler_win.cc

Index: base/profiler/cpu_profiler_win.cc
diff --git a/base/profiler/cpu_profiler_win.cc b/base/profiler/cpu_profiler_win.cc
deleted file mode 100644
index bc7d01ab534f5e64cc54c8af7b42c4cc783ac8eb..0000000000000000000000000000000000000000
--- a/base/profiler/cpu_profiler_win.cc
+++ /dev/null
@@ -1,196 +0,0 @@
-// 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/cpu_profiler.h"
-
-#include <Tlhelp32.h>
-#include <dbghelp.h>
-#include <stddef.h>
-#include <windows.h>
-
-#include "base/debug/stack_trace.h"
-#include "base/threading/platform_thread.h"
-#include "base/threading/thread_id_name_manager.h"
-#include "base/time/time.h"
-
-namespace base {
-
-namespace {
-
-const DWORD kSuspendFailed = static_cast<DWORD>(-1);
-
-int StackTrace64(CONTEXT* context, int max_stack_size,
-                 StackTraceEntry* stack_trace,
-                 bool* last_frame_is_unknown_function) {
-#ifdef _WIN64
-  *last_frame_is_unknown_function = false;
-
-  IMAGEHLP_SYMBOL64 sym;
-  sym.SizeOfStruct  = sizeof(sym);
-  sym.MaxNameLength = 0;
-
-  for (int i = 0; i < max_stack_size; ++i, ++stack_trace) {
-    // Try to look up unwind metadata for the current function.
-    ULONG64 image_base;
-    PRUNTIME_FUNCTION runtime_function =
-        RtlLookupFunctionEntry(context->Rip, &image_base, nullptr);
-
-    stack_trace->rsp = context->Rsp;
-    stack_trace->rip = context->Rip;
-    stack_trace->module = nullptr;
-
-    if (runtime_function) {
-      KNONVOLATILE_CONTEXT_POINTERS nvcontext = {0};
-      void* handler_data;
-      ULONG64 establisher_frame;
-      RtlVirtualUnwind(0, image_base, context->Rip, runtime_function, context,
-          &handler_data, &establisher_frame, &nvcontext);
-    } else {
-      // If we don't have a RUNTIME_FUNCTION, then we've encountered
-      // a leaf function.  Adjust the stack appropriately.
-      context->Rip = *reinterpret_cast<PDWORD64>(context->Rsp);
-      context->Rsp += 8;
-      *last_frame_is_unknown_function = true;
-    }
-
-    if (!context->Rip)
-      return i;
-  }
-  return max_stack_size;
-#else
-  return 0;
-#endif
-}
-
-// Look up modules from instruction pointers.
-void FindModulesForIPs(StackTraceEntry* stack_trace, int stack_depth,
-                       bool last_frame_is_unknown_function) {
-  const int module_frames = last_frame_is_unknown_function ? stack_depth - 1 :
-      stack_depth;
-  for (int i = 0; i < module_frames; ++i) {
-    HMODULE module = NULL;
-    if (GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
-                          GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
-                          reinterpret_cast<LPCTSTR>(stack_trace[i].rip),
-                          &module)) {
-      stack_trace->module = module;
-    }
-  }
-}
-
-int SampleThread(HANDLE thread_handle, int max_stack_size,
-                 StackTraceEntry* stack) {
-  if (::SuspendThread(thread_handle) == kSuspendFailed) {
-    LOG(ERROR) << "SuspendThread failed: " << GetLastError();
-    return 0;
-  }
-
-  CONTEXT thread_context = {0};
-  thread_context.ContextFlags = CONTEXT_ALL;
-  if (!::GetThreadContext(thread_handle, &thread_context)) {
-    LOG(ERROR) << "GetThreadContext failed: " << GetLastError();
-  }
-
-  bool last_frame_is_unknown_function = false;
-  int stack_depth = StackTrace64(&thread_context, max_stack_size, stack,
-                                 &last_frame_is_unknown_function);
-
-  if (::ResumeThread(thread_handle) == kSuspendFailed) {
-    LOG(ERROR) << "ResumeThread failed: " << GetLastError();
-  }
-
-  FindModulesForIPs(stack, stack_depth, last_frame_is_unknown_function);
-
-  return stack_depth;
-}
-
-void GetNames(StackTraceEntry* stack_trace, int stack_depth) {
-  HANDLE process = GetCurrentProcess();
-  DWORD64 displacement = 0;
-  DWORD line_displacement = 0;
-  char buffer[sizeof(SYMBOL_INFO) + MAX_SYM_NAME * sizeof(wchar_t)];
-  SYMBOL_INFO* symbol_info = reinterpret_cast<SYMBOL_INFO*>(buffer);
-  symbol_info->SizeOfStruct = sizeof(SYMBOL_INFO);
-  symbol_info->MaxNameLen = MAX_SYM_NAME;
-  std::string file_name;
-
-  IMAGEHLP_LINE64 line;
-  line.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
-
-  for (int i = 0; i < stack_depth; ++i, ++stack_trace) {
-    DWORD64 address = stack_trace->rip;
-    if (!SymFromAddr(process, address, &displacement, symbol_info)) {
-      wcscpy_s(reinterpret_cast<wchar_t*>(symbol_info->Name),
-               symbol_info->MaxNameLen, L"failed");
-    }
-    if (!SymGetLineFromAddr64(process, address, &line_displacement, &line)) {
-      line.LineNumber = 0;
-      file_name.clear();
-    } else {
-      file_name.assign(line.FileName);
-    }
-  }
-}
-
-}
-
-CpuProfiler::CpuProfiler()
-    : main_thread_(0),
-      main_thread_stack_depth_(0) {
-#ifdef _WIN64
-  // Record the main thread's handle.
-  BOOL result = ::DuplicateHandle(::GetCurrentProcess(), ::GetCurrentThread(),
-                                  ::GetCurrentProcess(), &main_thread_, 0,
-                                  FALSE, DUPLICATE_SAME_ACCESS);
-  DCHECK(result) << "DuplicateHandle failed";
-
-  // Initialization
-  if (RtlVirtualUnwind == NULL && RtlLookupFunctionEntry == NULL) {
-    const HMODULE nt_dll_handle = ::GetModuleHandle(L"ntdll.dll");
-    reinterpret_cast<void*&>(RtlVirtualUnwind) =
-        ::GetProcAddress(nt_dll_handle, "RtlVirtualUnwind");
-    reinterpret_cast<void*&>(RtlLookupFunctionEntry) =
-        ::GetProcAddress(nt_dll_handle, "RtlLookupFunctionEntry");
-  }
-#endif
-}
-
-CpuProfiler::~CpuProfiler() {
-#ifdef _WIN64
-  CloseHandle(main_thread_);
-#endif
-}
-
-// static
-bool CpuProfiler::IsPlatformSupported() {
-#ifdef _WIN64
-  return true;
-#else
-  return false;
-#endif
-}
-
-void CpuProfiler::OnTimer() {
-  main_thread_stack_depth_ = SampleThread(
-      main_thread_, arraysize(main_thread_stack_), main_thread_stack_);
-  ProcessStack(main_thread_stack_, main_thread_stack_depth_);
-
-  modules_.clear();
-  main_thread_stack_depth_ = 0;
-}
-
-void CpuProfiler::ProcessStack(StackTraceEntry* stack, int stack_depth) {
-  for (int i = 0; i < stack_depth; ++i, ++stack) {
-    HMODULE module = stack->module;
-    if (!module || (modules_.find(module) != modules_.end()))
-      continue;
-
-    wchar_t module_name[MAX_PATH];
-    if (GetModuleFileName(module, module_name, arraysize(module_name))) {
-      modules_.insert(std::pair<HMODULE, base::string16>(module, module_name));
-    }
-  }
-}
-
-}  // namespace base