[bindings] Utilize branch prediction macro LIKELY for V8 to native value conversion.

Source/bindings/core/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2012 Ericsson AB. 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.
@@ skipping 396 matching lines @@
 // http://www.w3.org/TR/WebIDL/#es-unsigned-short
 CORE_EXPORT uint16_t toUInt16(v8::Isolate*, v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
 
 // Convert a value to a 32-bit signed integer. The conversion fails if the
 // value cannot be converted to a number or the range violated per WebIDL:
 // http://www.w3.org/TR/WebIDL/#es-long
 CORE_EXPORT int32_t toInt32Slow(v8::Isolate*, v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
 inline int32_t toInt32(v8::Isolate* isolate, v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
 {
     // Fast case. The value is already a 32-bit integer.
-    if (value->IsInt32())
+    if (LIKELY(value->IsInt32()))
         return value.As<v8::Int32>()->Value();
     return toInt32Slow(isolate, value, configuration, exceptionState);
 }
 
 // Convert a value to a 32-bit unsigned integer. The conversion fails if the
 // value cannot be converted to a number or the range violated per WebIDL:
 // http://www.w3.org/TR/WebIDL/#es-unsigned-long
 CORE_EXPORT uint32_t toUInt32Slow(v8::Isolate*, v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
 inline uint32_t toUInt32(v8::Isolate* isolate, v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
 {
     // Fast case. The value is already a 32-bit unsigned integer.
-    if (value->IsUint32())
+    if (LIKELY(value->IsUint32()))
         return value.As<v8::Uint32>()->Value();
 
     // Fast case. The value is a 32-bit signed integer with NormalConversion configuration.
-    if (value->IsInt32() && configuration == NormalConversion)
+    if (LIKELY(value->IsInt32() && configuration == NormalConversion))
         return value.As<v8::Int32>()->Value();
 
     return toUInt32Slow(isolate, value, configuration, exceptionState);
 }
 
 // Convert a value to a 64-bit signed integer. The conversion fails if the
 // value cannot be converted to a number or the range violated per WebIDL:
 // http://www.w3.org/TR/WebIDL/#es-long-long
 CORE_EXPORT int64_t toInt64Slow(v8::Isolate*, v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
 inline int64_t toInt64(v8::Isolate* isolate, v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
 {
     // Clamping not supported for int64_t/long long int. See Source/wtf/MathExtras.h.
     ASSERT(configuration != Clamp);
 
     // Fast case. The value is a 32-bit integer.
-    if (value->IsInt32())
+    if (LIKELY(value->IsInt32()))
         return value.As<v8::Int32>()->Value();
 
     return toInt64Slow(isolate, value, configuration, exceptionState);
 }
 
 // Convert a value to a 64-bit unsigned integer. The conversion fails if the
 // value cannot be converted to a number or the range violated per WebIDL:
 // http://www.w3.org/TR/WebIDL/#es-unsigned-long-long
 CORE_EXPORT uint64_t toUInt64Slow(v8::Isolate*, v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
 inline uint64_t toUInt64(v8::Isolate* isolate, v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
 {
     // Fast case. The value is a 32-bit unsigned integer.
-    if (value->IsUint32())
+    if (LIKELY(value->IsUint32()))
         return value.As<v8::Uint32>()->Value();
 
-    if (value->IsInt32() && configuration == NormalConversion)
+    if (LIKELY(value->IsInt32() && configuration == NormalConversion))
         return value.As<v8::Int32>()->Value();
 
     return toUInt64Slow(isolate, value, configuration, exceptionState);
 }
 
 // Convert a value to a double precision float, which might fail.
 CORE_EXPORT double toDoubleSlow(v8::Isolate*, v8::Handle<v8::Value>, ExceptionState&);
 inline double toDouble(v8::Isolate* isolate, v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
-    if (value->IsNumber())
+    if (LIKELY(value->IsNumber()))
         return value.As<v8::Number>()->Value();
     return toDoubleSlow(isolate, value, exceptionState);
 }
 
 // Convert a value to a double precision float, throwing on non-finite values.
 CORE_EXPORT double toRestrictedDouble(v8::Isolate*, v8::Handle<v8::Value>, ExceptionState&);
 
 // Convert a value to a single precision float, which might fail.
 inline float toFloat(v8::Isolate* isolate, v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
@@ skipping 504 matching lines @@
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> devToolsTraceEventData(v8::Isolate*, ExecutionContext*, v8::Handle<v8::Function>);
 
 // Callback functions used by generated code.
 CORE_EXPORT void v8ConstructorAttributeGetter(v8::Local<v8::Name> propertyName, const v8::PropertyCallbackInfo<v8::Value>&);
 
 typedef void (*InstallTemplateFunction)(v8::Local<v8::FunctionTemplate>, v8::Isolate*);
 
 } // namespace blink
 
 #endif // V8Binding_h