Store builtin index on the builtin code object.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/395823002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22429 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/builtins.cc

@@ -1638,6 +1638,7 @@ void Builtins::SetUp(Isolate* isolate, bool create_heap_objects) {
       PROFILE(isolate,
               CodeCreateEvent(Logger::BUILTIN_TAG, *code, functions[i].s_name));
       builtins_[i] = *code;
+      if (code->kind() == Code::BUILTIN) code->set_builtin_index(i);
 #ifdef ENABLE_DISASSEMBLER
       if (FLAG_print_builtin_code) {
         CodeTracer::Scope trace_scope(isolate->GetCodeTracer());

src/objects-inl.h

@@ -4800,6 +4800,18 @@ void Code::set_profiler_ticks(int ticks) {
 }
 
 
+int Code::builtin_index() {
+  ASSERT_EQ(BUILTIN, kind());
+  return READ_INT32_FIELD(this, kKindSpecificFlags1Offset);
+}
+
+
+void Code::set_builtin_index(int index) {
+  ASSERT_EQ(BUILTIN, kind());
+  WRITE_INT32_FIELD(this, kKindSpecificFlags1Offset, index);
+}
+
+
 unsigned Code::stack_slots() {
   ASSERT(is_crankshafted());
   return StackSlotsField::decode(

src/objects.h

@@ -5608,6 +5608,10 @@ class Code: public HeapObject {
   inline int profiler_ticks();
   inline void set_profiler_ticks(int ticks);
 
+  // [builtin_index]: For BUILTIN kind, tells which builtin index it has.
+  inline int builtin_index();
+  inline void set_builtin_index(int id);
+
   // [stack_slots]: For kind OPTIMIZED_FUNCTION, the number of stack slots
   // reserved in the code prologue.
   inline unsigned stack_slots();

src/serialize.cc

@@ -1938,6 +1938,7 @@ void CodeSerializer::SerializeObject(Object* o, HowToCode how_to_code,
       SerializeBuiltin(code_object, how_to_code, where_to_point, skip);
       return;
     }
+    // TODO(yangguo) figure out whether other code kinds can be handled smarter.
   }
 
   if (heap_object == source_) {
@@ -1965,15 +1966,11 @@ void CodeSerializer::SerializeBuiltin(Code* builtin, HowToCode how_to_code,
 
   ASSERT((how_to_code == kPlain && where_to_point == kStartOfObject) ||
          (how_to_code == kFromCode && where_to_point == kInnerPointer));
-  int id = 0;
-  do {  // Look for existing builtins in the list.
-    Code* b = isolate()->builtins()->builtin(static_cast<Builtins::Name>(id));
-    if (builtin == b) break;
-  } while (++id < Builtins::builtin_count);
-  ASSERT(id < Builtins::builtin_count);  // We must have found a one.
-
+  int builtin_index = builtin->builtin_index();
+  ASSERT_LT(builtin_index, Builtins::builtin_count);
+  ASSERT_LE(0, builtin_index);
   sink_->Put(kBuiltin + how_to_code + where_to_point, "Builtin");
-  sink_->PutInt(id, "builtin_index");
+  sink_->PutInt(builtin_index, "builtin_index");
 }