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

src/v8.cc

Index: src/v8.cc
diff --git a/src/v8.cc b/src/v8.cc
index 2910a0700d92223521dddf8a072fc65fb6fa9615..96ffcd581edc69dde6a0611457dc6f81845a33c1 100644
--- a/src/v8.cc
+++ b/src/v8.cc
@@ -60,6 +60,8 @@ static LazyMutex entropy_mutex = LAZY_MUTEX_INITIALIZER;
 
 static EntropySource entropy_source;
 
+static FunctionEntryHook profiler_entry_hook = NULL;
+
 
 bool V8::Initialize(Deserializer* des) {
   FlagList::EnforceFlagImplications();
@@ -164,6 +166,37 @@ void V8::SetReturnAddressLocationResolver(
 }
 
 
+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());