(early draft) Strict mode - throw exception on assignment to read only property.

src/ia32/stub-cache-ia32.cc

 // Copyright 2006-2009 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 3694 matching lines @@
   //  -- eax    : value
   //  -- ecx    : key
   //  -- edx    : receiver
   //  -- esp[0] : return address
   // -----------------------------------
 
   __ pop(ebx);
   __ push(edx);
   __ push(ecx);
   __ push(eax);
-  __ push(ebx);
+  __ push(Immediate(Smi::FromInt(NONE)));   // PropertyAttributes
+  __ push(Immediate(Smi::FromInt(
+      Code::ExtractExtraICStateFromFlags(flags) == kStrictMode
+        ? kStrictMode
+        : kNonStrictMode)));
+  __ push(ebx);   // return address
 
   // Do tail-call to runtime routine.
-  __ TailCallRuntime(Runtime::kSetProperty, 3, 1);
+  __ TailCallRuntime(Runtime::kSetProperty, 5, 1);
 
   return GetCode(flags);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32