Implements a new API to set a function entry hook for profiling.

src/v8.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 42 matching lines @@
 bool V8::has_been_set_up_ = false;
 bool V8::has_been_disposed_ = false;
 bool V8::has_fatal_error_ = false;
 bool V8::use_crankshaft_ = true;
 List<CallCompletedCallback>* V8::call_completed_callbacks_ = NULL;
 
 static LazyMutex entropy_mutex = LAZY_MUTEX_INITIALIZER;
 
 static EntropySource entropy_source;
 
+static FunctionEntryHook profiler_entry_hook = NULL;
+
 
 bool V8::Initialize(Deserializer* des) {
   FlagList::EnforceFlagImplications();
 
   InitializeOncePerProcess();
 
   // The current thread may not yet had entered an isolate to run.
   // Note the Isolate::Current() may be non-null because for various
   // initialization purposes an initializing thread may be assigned an isolate
   // but not actually enter it.
@@ skipping 84 matching lines @@
   entropy_source = source;
 }
 
 
 void V8::SetReturnAddressLocationResolver(
       ReturnAddressLocationResolver resolver) {
   StackFrame::SetReturnAddressLocationResolver(resolver);
 }
 
 
+bool V8::SetFunctionEntryHook(FunctionEntryHook entry_hook) {
+  // We don't allow setting a new entry hook over one that's
+  // already active, as the hooks won't stack.
+  if (entry_hook != 0 && profiler_entry_hook != 0)
+    return false;
+
+  profiler_entry_hook = entry_hook;
+
+  return true;
+}
+
+
+static void EntryHookDispatcher(intptr_t function,
+                                intptr_t stack_pointer,
+                                uint64_t entry_time) {
+  if (profiler_entry_hook != NULL)
+    profiler_entry_hook(function, stack_pointer, entry_time);                                

[danno, 2012/07/10 09:37:13]

80 col?

[Sigurður Ásgeirsson, 2012/07/11 14:50:34]

Done.

+}
+
+
+
+const FunctionEntryHook* V8::GetFunctionEntryHookLocation() {
+  return &profiler_entry_hook;
+}
+
+
+FunctionEntryHook V8::GetFunctionEntryHookDispatcher() {
+  return EntryHookDispatcher;
+}
+
+
 // Used by JavaScript APIs
 uint32_t V8::Random(Context* context) {
   ASSERT(context->IsGlobalContext());
   ByteArray* seed = context->random_seed();
   return random_base(reinterpret_cast<uint32_t*>(seed->GetDataStartAddress()));
 }
 
 
 // Used internally by the JIT and memory allocator for security
 // purposes. So, we keep a different state to prevent informations
@@ skipping 102 matching lines @@
   SetUpJSCallerSavedCodeData();
   SamplerRegistry::SetUp();
   ExternalReference::SetUp();
 }
 
 void V8::InitializeOncePerProcess() {
   CallOnce(&init_once, &InitializeOncePerProcessImpl);
 }
 
 } }  // namespace v8::internal