Make Object::IsFoo const.

src/objects.cc

 // Copyright 2013 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/v8.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 74 matching lines @@
   if (IsBoolean()) return IsTrue();
   if (IsSmi()) return Smi::cast(this)->value() != 0;
   if (IsUndefined() || IsNull()) return false;
   if (IsUndetectableObject()) return false;   // Undetectable object is false.
   if (IsString()) return String::cast(this)->length() != 0;
   if (IsHeapNumber()) return HeapNumber::cast(this)->HeapNumberBooleanValue();
   return true;
 }
 
 
-bool Object::IsCallable() {
-  Object* fun = this;
+bool Object::IsCallable() const {
+  const Object* fun = this;
   while (fun->IsJSFunctionProxy()) {
     fun = JSFunctionProxy::cast(fun)->call_trap();
   }
   return fun->IsJSFunction() ||
          (fun->IsHeapObject() &&
           HeapObject::cast(fun)->map()->has_instance_call_handler());
 }
 
 
 void Object::Lookup(Handle<Name> name, LookupResult* result) {
@@ skipping 16851 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal