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

src/x64/virtual-frame-x64.cc

Index: src/x64/virtual-frame-x64.cc
diff --git a/src/x64/virtual-frame-x64.cc b/src/x64/virtual-frame-x64.cc
index ea115f28a2e115868fa0264c190b65375f9f1e5b..57a33ec509fb493b4d64f729041402b3cd843f94 100644
--- a/src/x64/virtual-frame-x64.cc
+++ b/src/x64/virtual-frame-x64.cc
@@ -1124,9 +1124,9 @@ Result VirtualFrame::CallStoreIC(Handle<String> name,
                                  StrictModeFlag strict_mode) {
   // Value and (if not contextual) receiver are on top of the frame.
   // The IC expects name in rcx, value in rax, and receiver in rdx.
-  Handle<Code> ic(Builtins::builtin(strict_mode == kStrictMode
-      ? Builtins::StoreIC_Initialize_Strict
-      : Builtins::StoreIC_Initialize));
+  Handle<Code> ic(Builtins::builtin(
+      strict_mode == kStrictMode ? Builtins::StoreIC_Initialize_Strict
+                                 : Builtins::StoreIC_Initialize));
   Result value = Pop();
   RelocInfo::Mode mode;
   if (is_contextual) {
@@ -1146,7 +1146,7 @@ Result VirtualFrame::CallStoreIC(Handle<String> name,
 }
 
 
-Result VirtualFrame::CallKeyedStoreIC() {
+Result VirtualFrame::CallKeyedStoreIC(StrictModeFlag strict_mode) {
   // Value, key, and receiver are on the top of the frame.  The IC
   // expects value in rax, key in rcx, and receiver in rdx.
   Result value = Pop();
@@ -1190,7 +1190,9 @@ Result VirtualFrame::CallKeyedStoreIC() {
     receiver.Unuse();
   }
 
-  Handle<Code> ic(Builtins::builtin(Builtins::KeyedStoreIC_Initialize));
+  Handle<Code> ic(Builtins::builtin(
+      strict_mode == kStrictMode ? Builtins::KeyedStoreIC_Initialize_Strict
+                                 : Builtins::KeyedStoreIC_Initialize));
   return RawCallCodeObject(ic, RelocInfo::CODE_TARGET);
 }