Array builtins proceed blithely on frozen arrays

src/mips/stub-cache-mips.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 1579 matching lines @@
 }
 
 
 Handle<Code> CallStubCompiler::CompileArrayPushCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
-  // If object is not an array or is observed, bail out to regular call.
+  // If object is not an array or is observed or sealed, bail out to regular
+  // call.
   if (!object->IsJSArray() ||
       !cell.is_null() ||
-      Handle<JSArray>::cast(object)->map()->is_observed()) {
+      Handle<JSArray>::cast(object)->map()->is_observed() ||
+      !Handle<JSArray>::cast(object)->map()->is_extensible()) {
     return Handle<Code>::null();
   }
 
   Label miss;
   HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
   Register receiver = a0;
   Register scratch = a1;
 
   const int argc = arguments().immediate();
 
@@ skipping 218 matching lines @@
 }
 
 
 Handle<Code> CallStubCompiler::CompileArrayPopCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
-  // If object is not an array or is observed, bail out to regular call.
+  // If object is not an array or is observed or sealed, bail out to regular
+  // call.
   if (!object->IsJSArray() ||
       !cell.is_null() ||
-      Handle<JSArray>::cast(object)->map()->is_observed()) {
+      Handle<JSArray>::cast(object)->map()->is_observed() ||
+      !Handle<JSArray>::cast(object)->map()->is_extensible()) {
     return Handle<Code>::null();
   }
 
   Label miss, return_undefined, call_builtin;
   Register receiver = a0;
   Register scratch = a1;
   Register elements = a3;
   HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
 
   // Get the elements array of the object.
@@ skipping 1026 matching lines @@
   // -----------------------------------
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_Miss);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS