From: verwaest@chromium.org <verwaest@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Mon, 2 Dec 2013 09:51:37 +0000 (+0000)
Subject: Remove special "store global proxy" IC, use as slow_stub().
X-Git-Tag: upstream/4.7.83~11476
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=98897182f52b0860cb27df2a3099e6187d44d403;p=platform%2Fupstream%2Fv8.git

Remove special "store global proxy" IC, use as slow_stub().

R=mvstanton@chromium.org

Review URL: https://chromiumcodereview.appspot.com/95503003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18173 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---

diff --git a/src/builtins.cc b/src/builtins.cc
index 19e8336..bc6dceb 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -1421,16 +1421,6 @@ static void Generate_StoreIC_Megamorphic_Strict(MacroAssembler* masm) {
 }
 
 
-static void Generate_StoreIC_GlobalProxy(MacroAssembler* masm) {
-  StoreIC::GenerateRuntimeSetProperty(masm, kNonStrictMode);
-}
-
-
-static void Generate_StoreIC_GlobalProxy_Strict(MacroAssembler* masm) {
-  StoreIC::GenerateRuntimeSetProperty(masm, kStrictMode);
-}
-
-
 static void Generate_StoreIC_Setter_ForDeopt(MacroAssembler* masm) {
   StoreStubCompiler::GenerateStoreViaSetter(masm, Handle<JSFunction>());
 }
diff --git a/src/builtins.h b/src/builtins.h
index f76ed02..edc13f7 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -157,16 +157,12 @@ enum BuiltinExtraArguments {
                                     kNoExtraICState)                    \
   V(StoreIC_Generic_Strict,         STORE_IC, GENERIC,                  \
                                     StoreIC::kStrictModeState)          \
-  V(StoreIC_GlobalProxy,            STORE_IC, GENERIC,                  \
-                                    kNoExtraICState)                    \
   V(StoreIC_Initialize_Strict,      STORE_IC, UNINITIALIZED,            \
                                     StoreIC::kStrictModeState)          \
   V(StoreIC_PreMonomorphic_Strict,  STORE_IC, PREMONOMORPHIC,           \
                                     StoreIC::kStrictModeState)          \
   V(StoreIC_Megamorphic_Strict,     STORE_IC, MEGAMORPHIC,              \
                                     StoreIC::kStrictModeState)          \
-  V(StoreIC_GlobalProxy_Strict,     STORE_IC, GENERIC,                  \
-                                    StoreIC::kStrictModeState)          \
   V(StoreIC_Setter_ForDeopt,        STORE_IC, MONOMORPHIC,              \
                                     StoreIC::kStrictModeState)          \
                                                                         \
diff --git a/src/ic.cc b/src/ic.cc
index 46820fe..6ee728a 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -1454,7 +1454,8 @@ static bool LookupForWrite(Handle<JSObject> receiver,
     }
 
     if (lookup->IsPropertyCallbacks()) return true;
-
+    // JSGlobalProxy always goes via the runtime, so it's safe to cache.
+    if (receiver->IsJSGlobalProxy()) return true;
     // Currently normal holders in the prototype chain are not supported. They
     // would require a runtime positive lookup and verification that the details
     // have not changed.
@@ -1561,20 +1562,6 @@ MaybeObject* StoreIC::Store(Handle<Object> object,
     return *result;
   }
 
-  if (receiver->IsJSGlobalProxy()) {
-    if (FLAG_use_ic && kind() != Code::KEYED_STORE_IC) {
-      // Generate a generic stub that goes to the runtime when we see a global
-      // proxy as receiver.
-      Handle<Code> stub = global_proxy_stub();
-      set_target(*stub);
-      TRACE_IC("StoreIC", name);
-    }
-    Handle<Object> result = JSReceiver::SetProperty(
-        receiver, name, value, NONE, strict_mode(), store_mode);
-    RETURN_IF_EMPTY_HANDLE(isolate(), result);
-    return *result;
-  }
-
   LookupResult lookup(isolate());
   bool can_store = LookupForWrite(receiver, name, value, &lookup, this);
   if (!can_store &&
@@ -1611,7 +1598,6 @@ void StoreIC::UpdateCaches(LookupResult* lookup,
                            Handle<JSObject> receiver,
                            Handle<String> name,
                            Handle<Object> value) {
-  ASSERT(!receiver->IsJSGlobalProxy());
   ASSERT(lookup->IsFound());
 
   // These are not cacheable, so we never see such LookupResults here.
@@ -1629,6 +1615,7 @@ Handle<Code> StoreIC::CompileHandler(LookupResult* lookup,
                                      Handle<String> name,
                                      Handle<Object> value,
                                      InlineCacheHolderFlag cache_holder) {
+  if (object->IsJSGlobalProxy()) return slow_stub();
   ASSERT(cache_holder == OWN_MAP);
   // This is currently guaranteed by checks in StoreIC::Store.
   Handle<JSObject> receiver = Handle<JSObject>::cast(object);
diff --git a/src/ic.h b/src/ic.h
index 3db352a..b1a47e2 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -642,14 +642,6 @@ class StoreIC: public IC {
     }
   }
 
-  virtual Handle<Code> global_proxy_stub() {
-    if (strict_mode() == kStrictMode) {
-      return isolate()->builtins()->StoreIC_GlobalProxy_Strict();
-    } else {
-      return isolate()->builtins()->StoreIC_GlobalProxy();
-    }
-  }
-
   // Update the inline cache and the global stub cache based on the
   // lookup result.
   void UpdateCaches(LookupResult* lookup,
diff --git a/src/type-info.cc b/src/type-info.cc
index 79134ca..e4eb7db 100644
--- a/src/type-info.cc
+++ b/src/type-info.cc
@@ -522,11 +522,7 @@ void TypeFeedbackOracle::CollectReceiverTypes(TypeFeedbackId ast_id,
   Handle<Object> object = GetInfo(ast_id);
   if (object->IsUndefined() || object->IsSmi()) return;
 
-  if (object.is_identical_to(isolate_->builtins()->StoreIC_GlobalProxy())) {
-    // TODO(fschneider): We could collect the maps and signal that
-    // we need a generic store (or load) here.
-    ASSERT(Handle<Code>::cast(object)->ic_state() == GENERIC);
-  } else if (object->IsMap()) {
+  if (object->IsMap()) {
     types->AddMapIfMissing(Handle<Map>::cast(object), zone());
   } else if (Handle<Code>::cast(object)->ic_state() == POLYMORPHIC ||
              Handle<Code>::cast(object)->ic_state() == MONOMORPHIC) {