Refactor type checks in v8natives.js and runtime.js....

src/arm/full-codegen-arm.cc

 // Copyright 2009 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 1890 matching lines @@
   __ cmp(r1, Operand(FIRST_JS_OBJECT_TYPE));
   __ b(lt, if_false);
   __ cmp(r1, Operand(LAST_JS_OBJECT_TYPE));
   __ b(le, if_true);
   __ b(if_false);
 
   Apply(context_, if_true, if_false);
 }
 
 
+void FullCodeGenerator::EmitIsSpecObject(ZoneList<Expression*>* args) {
+  ASSERT(args->length() == 1);
+
+  VisitForValue(args->at(0), kAccumulator);
+
+  Label materialize_true, materialize_false;
+  Label* if_true = NULL;
+  Label* if_false = NULL;
+  PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
+
+  __ BranchOnSmi(r0, if_false);
+  __ CompareObjectType(r0, r1, r1, FIRST_JS_OBJECT_TYPE);
+  __ b(ge, if_true);
+  __ b(if_false);
+
+  Apply(context_, if_true, if_false);
+}
+
+
 void FullCodeGenerator::EmitIsUndetectableObject(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 1);
 
   VisitForValue(args->at(0), kAccumulator);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
   Label* if_false = NULL;
   PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
 
@@ skipping 1229 matching lines @@
   __ mov(r1, Operand(r1, ASR, 1));  // Un-smi-tag value.
   __ add(pc, r1, Operand(masm_->CodeObject()));
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM