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

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index 51cc46a08e5c6cdbb95dab5222fb08ffb1080248..e996d392d86606cc71c0910f5957f6dbbbf8b4ac 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -3712,10 +3712,15 @@ MaybeObject* ExternalArrayStubCompiler::CompileKeyedStoreStub(
   __ 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);
 }