Add HeapNumber fast path to v8::Value::{Uint,Int}32Value()

src/api.cc

 // Copyright 2012 the V8 project 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 "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 2811 matching lines @@
       value = isolate->factory()->NewNumber(index);
     }
     return Utils::Uint32ToLocal(value);
   }
   return Local<Uint32>();
 }
 
 
 int32_t Value::Int32Value() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
-  if (obj->IsSmi()) {
-    return i::Smi::cast(*obj)->value();
+  if (obj->IsNumber()) {
+    return NumberToInt32(*obj);
   } else {
     i::Isolate* isolate = i::HeapObject::cast(*obj)->GetIsolate();
     LOG_API(isolate, "Int32Value (slow)");
     ENTER_V8(isolate);
     EXCEPTION_PREAMBLE(isolate);
     i::Handle<i::Object> num;
     has_pending_exception = !i::Execution::ToInt32(isolate, obj).ToHandle(&num);
     EXCEPTION_BAILOUT_CHECK(isolate, 0);
     if (num->IsSmi()) {
       return i::Smi::cast(*num)->value();
@@ skipping 79 matching lines @@
                        "Reading from empty handle")) {
     return false;
   }
   i::Handle<i::Object> other = Utils::OpenHandle(*that);
   return obj->SameValue(*other);
 }
 
 
 uint32_t Value::Uint32Value() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
-  if (obj->IsSmi()) {
-    return i::Smi::cast(*obj)->value();
+  if (obj->IsNumber()) {
+    return NumberToUint32(*obj);
   } else {
     i::Isolate* isolate = i::HeapObject::cast(*obj)->GetIsolate();
     LOG_API(isolate, "Uint32Value");
     ENTER_V8(isolate);
     EXCEPTION_PREAMBLE(isolate);
     i::Handle<i::Object> num;
     has_pending_exception = !i::Execution::ToUint32(
         isolate, obj).ToHandle(&num);
     EXCEPTION_BAILOUT_CHECK(isolate, 0);
     if (num->IsSmi()) {
@@ skipping 4649 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal