Add machinery to support arguments escaping to safe builtins

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 9859 matching lines @@
   ASSERT(shrink_by % kEntryLength == 0);
   ASSERT(shrink_by <= code_map->length() - kEntriesStart);
   // Always trim even when array is cleared because of heap verifier.
   RightTrimFixedArray<Heap::FROM_GC>(GetHeap(), code_map, shrink_by);
   if (code_map->length() == kEntriesStart) {
     ClearOptimizedCodeMap();
   }
 }
 
 
+bool SharedFunctionInfo::CanHandleArgumentsSafely() {
+  if (!HasBuiltinFunctionId()) return false;
+  switch (builtin_function_id()) {
+    default: return false;
+  }
+  UNREACHABLE();
+}
+
+
 void JSObject::OptimizeAsPrototype(Handle<JSObject> object) {
   if (object->IsGlobalObject()) return;
 
   // Make sure prototypes are fast objects and their maps have the bit set
   // so they remain fast.
   if (!object->HasFastProperties()) {
     TransformToFastProperties(object, 0);
   }
 }
 
@@ skipping 7064 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