Support the Syzygy instrumenting profiler.

chrome/common/profiling.cc

 // Copyright (c) 2012 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 "chrome/common/profiling.h"
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/profiler.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "base/threading/thread.h"
 #include "chrome/common/chrome_switches.h"
+#include "v8/include/v8.h"
 
 namespace {
 std::string GetProfileName() {
   static const char kDefaultProfileName[] = "chrome-profile-{type}-{pid}";
   CR_DEFINE_STATIC_LOCAL(std::string, profile_name, ());
 
   if (profile_name.empty()) {
     const CommandLine& command_line = *CommandLine::ForCurrentProcess();
     if (command_line.HasSwitch(switches::kProfilingFile))
       profile_name = command_line.GetSwitchValueASCII(switches::kProfilingFile);
@@ skipping 69 matching lines @@
     g_flush_thread_control = LAZY_INSTANCE_INITIALIZER;
 
 } // namespace
 
 // static
 void Profiling::ProcessStarted() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   std::string process_type =
       command_line.GetSwitchValueASCII(switches::kProcessType);
 
+  // Establish the V8 return address resolution hook if we're
+  // an instrumented binary.
+  if (base::debug::IsBinaryInstrumented()) {
+    base::debug::ReturnAddressLocationResolver resolve_func =
+        base::debug::GetProfilerReturnAddrResolutionFunc();
+
+    if (resolve_func != NULL) {
+      v8::V8::SetReturnAddressLocationResolver(resolve_func);
+    }
+  }
+
   if (command_line.HasSwitch(switches::kProfilingAtStart)) {
     std::string process_type_to_start =
         command_line.GetSwitchValueASCII(switches::kProfilingAtStart);
     if (process_type == process_type_to_start)
       Start();
   }
 }
 
 // static
 void Profiling::Start() {
@@ skipping 18 matching lines @@
   return base::debug::BeingProfiled();
 }
 
 // static
 void Profiling::Toggle() {
   if (BeingProfiled())
     Stop();
   else
     Start();
 }