[es6] Initial steps towards a correct implementation of IsCallable.

src/objects-debug.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/objects.h"
 
 #include "src/bootstrapper.h"
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/macro-assembler.h"
@@ skipping 18 matching lines @@
   if (p->IsHeapObject()) {
     HeapObject::VerifyHeapPointer(p);
   } else {
     CHECK(p->IsSmi());
   }
 }
 
 
 void Smi::SmiVerify() {
   CHECK(IsSmi());
+  CHECK(!IsCallable());
 }
 
 
 void HeapObject::HeapObjectVerify() {
   InstanceType instance_type = map()->instance_type();
 
   if (instance_type < FIRST_NONSTRING_TYPE) {
     String::cast(this)->StringVerify();
     return;
   }
@@ skipping 477 matching lines @@
 
 
 void JSFunction::JSFunctionVerify() {
   CHECK(IsJSFunction());
   VerifyObjectField(kPrototypeOrInitialMapOffset);
   VerifyObjectField(kNextFunctionLinkOffset);
   CHECK(code()->IsCode());
   CHECK(next_function_link() == NULL ||
         next_function_link()->IsUndefined() ||
         next_function_link()->IsJSFunction());
+  CHECK(map()->is_callable());
 }
 
 
 void SharedFunctionInfo::SharedFunctionInfoVerify() {
   CHECK(IsSharedFunctionInfo());
   VerifyObjectField(kNameOffset);
   VerifyObjectField(kCodeOffset);
   VerifyObjectField(kOptimizedCodeMapOffset);
   VerifyObjectField(kFeedbackVectorOffset);
   VerifyObjectField(kScopeInfoOffset);
@@ skipping 258 matching lines @@
   VerifyPointer(handler());
   CHECK(hash()->IsSmi() || hash()->IsUndefined());
 }
 
 
 void JSFunctionProxy::JSFunctionProxyVerify() {
   CHECK(IsJSFunctionProxy());
   JSProxyVerify();
   VerifyPointer(call_trap());
   VerifyPointer(construct_trap());
+  CHECK(map()->is_callable());
 }
 
 
 void JSArrayBuffer::JSArrayBufferVerify() {
   CHECK(IsJSArrayBuffer());
   JSObjectVerify();
   VerifyPointer(byte_length());
   CHECK(byte_length()->IsSmi() || byte_length()->IsHeapNumber()
         || byte_length()->IsUndefined());
 }
@@ skipping 491 matching lines @@
 
   // Both are done at the same time.
   CHECK_EQ(new_it.done(), old_it.done());
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8