Avoid bool to Oddball conversions by being lazy.

src/execution.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 583 matching lines @@
     Isolate* isolate = Isolate::Current();                              \
     Handle<Object> argv[] = args;                                       \
     ASSERT(has_pending_exception != NULL);                              \
     return Call(isolate->name##_fun(),                                  \
                 isolate->js_builtins_object(),                          \
                 ARRAY_SIZE(argv), argv,                                 \
                 has_pending_exception);                                 \
   } while (false)
 
 
-Handle<Object> Execution::ToBoolean(Isolate* isolate, Handle<Object> obj) {
-  // See the similar code in runtime.js:ToBoolean.
-  if (obj->IsBoolean()) return obj;
-  bool result = true;
-  if (obj->IsString()) {
-    result = Handle<String>::cast(obj)->length() != 0;
-  } else if (obj->IsNull() || obj->IsUndefined()) {
-    result = false;
-  } else if (obj->IsNumber()) {
-    double value = obj->Number();
-    result = !((value == 0) || isnan(value));
-  }
-  return Handle<Object>(isolate->heap()->ToBoolean(result), isolate);
-}
-
-
 Handle<Object> Execution::ToNumber(Handle<Object> obj, bool* exc) {
   RETURN_NATIVE_CALL(to_number, { obj }, exc);
 }
 
 
 Handle<Object> Execution::ToString(Handle<Object> obj, bool* exc) {
   RETURN_NATIVE_CALL(to_string, { obj }, exc);
 }
 
 
@@ skipping 312 matching lines @@
   }
   if (stack_guard->IsInterrupted()) {
     stack_guard->Continue(INTERRUPT);
     return isolate->StackOverflow();
   }
   return isolate->heap()->undefined_value();
 }
 
 
 } }  // namespace v8::internal