Index: chrome/child/child_profiling.cc |
diff --git a/chrome/child/child_profiling.cc b/chrome/child/child_profiling.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..bdd25f3067d3221eb31f628d17470a948a10fd26 |
--- /dev/null |
+++ b/chrome/child/child_profiling.cc |
@@ -0,0 +1,67 @@ |
+// Copyright 2017 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/child/child_profiling.h" |
+ |
+#include "base/debug/profiler.h" |
+#include "base/logging.h" |
+#include "gin/public/debug.h" |
+#include "v8/include/v8.h" |
+ |
+namespace { |
+ |
+base::debug::AddDynamicSymbol add_dynamic_symbol_func = NULL; |
+base::debug::MoveDynamicSymbol move_dynamic_symbol_func = NULL; |
+ |
+void JitCodeEventHandler(const v8::JitCodeEvent* event) { |
+ DCHECK_NE(static_cast<base::debug::AddDynamicSymbol>(NULL), |
+ add_dynamic_symbol_func); |
+ DCHECK_NE(static_cast<base::debug::MoveDynamicSymbol>(NULL), |
+ move_dynamic_symbol_func); |
+ |
+ switch (event->type) { |
+ case v8::JitCodeEvent::CODE_ADDED: |
+ add_dynamic_symbol_func(event->code_start, event->code_len, |
+ event->name.str, event->name.len); |
+ break; |
+ |
+ case v8::JitCodeEvent::CODE_MOVED: |
+ move_dynamic_symbol_func(event->code_start, event->new_code_start); |
+ break; |
+ |
+ default: |
+ break; |
+ } |
+} |
+ |
+} // namespace |
+ |
+// static |
+void ChildProfiling::ProcessStarted() { |
+ // Establish the V8 profiling hooks 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); |
+ } |
+ |
+ // Set up the JIT code entry handler and the symbol callbacks if the |
+ // profiler supplies them. |
+ // TODO(siggi): Maybe add a switch or an environment variable to turn off |
+ // V8 profiling? |
+ base::debug::DynamicFunctionEntryHook entry_hook_func = |
+ base::debug::GetProfilerDynamicFunctionEntryHookFunc(); |
+ add_dynamic_symbol_func = base::debug::GetProfilerAddDynamicSymbolFunc(); |
+ move_dynamic_symbol_func = base::debug::GetProfilerMoveDynamicSymbolFunc(); |
+ |
+ if (entry_hook_func != NULL && |
+ add_dynamic_symbol_func != NULL && |
+ move_dynamic_symbol_func != NULL) { |
+ gin::Debug::SetFunctionEntryHook(entry_hook_func); |
+ gin::Debug::SetJitCodeEventHandler(&JitCodeEventHandler); |
+ } |
+ } |
+} |