Always fail when trying to store to an undeclared global variable, even if it was found.

Finding a property, but not using an IC, indicates that the variable was
found on the prototype (in DOMWindow). Those properties need to be
ignored while storing global properties via the IC.

Review URL: https://chromiumcodereview.appspot.com/12040039

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13480 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ic.cc

@@ -542,7 +542,7 @@ MaybeObject* CallICBase::LoadFunction(State state,
   if (!lookup.IsFound()) {
     // If the object does not have the requested property, check which
     // exception we need to throw.
-    return IsContextual(object)
+    return IsUndeclaredGlobal(object)
         ? ReferenceError("not_defined", name)
         : TypeError("undefined_method", object, name);
   }
@@ -561,7 +561,7 @@ MaybeObject* CallICBase::LoadFunction(State state,
   if (lookup.IsInterceptor() && attr == ABSENT) {
     // If the object does not have the requested property, check which
     // exception we need to throw.
-    return IsContextual(object)
+    return IsUndeclaredGlobal(object)
         ? ReferenceError("not_defined", name)
         : TypeError("undefined_method", object, name);
   }
@@ -933,7 +933,7 @@ MaybeObject* LoadIC::Load(State state,
 
   // If we did not find a property, check if we need to throw an exception.
   if (!lookup.IsFound()) {
-    if (IsContextual(object)) {
+    if (IsUndeclaredGlobal(object)) {
       return ReferenceError("not_defined", name);
     }
     LOG(isolate(), SuspectReadEvent(*name, *object));
@@ -952,7 +952,7 @@ MaybeObject* LoadIC::Load(State state,
     RETURN_IF_EMPTY_HANDLE(isolate(), result);
     // If the property is not present, check if we need to throw an
     // exception.
-    if (attr == ABSENT && IsContextual(object)) {
+    if (attr == ABSENT && IsUndeclaredGlobal(object)) {
       return ReferenceError("not_defined", name);
     }
     return *result;
@@ -1463,11 +1463,8 @@ MaybeObject* StoreIC::Store(State state,
     if (FLAG_use_ic) {
       UpdateStoreCaches(&lookup, state, strict_mode, receiver, name, value);
     }
-  } else if (strict_mode == kStrictMode &&
-             !lookup.IsFound() &&
-             IsContextual(object)) {
-    // Strict mode doesn't allow setting non-existent global property
-    // or an assignment to a read only property.
+  } else if (strict_mode == kStrictMode && IsUndeclaredGlobal(object)) {
+    // Strict mode doesn't allow setting non-existent global property.
     return ReferenceError("not_defined", name);
   }
 

src/ic.h

@@ -110,16 +110,16 @@ class IC {
 
   // Returns if this IC is for contextual (no explicit receiver)
   // access to properties.
-  bool IsContextual(Handle<Object> receiver) {
+  bool IsUndeclaredGlobal(Handle<Object> receiver) {
     if (receiver->IsGlobalObject()) {
-      return SlowIsContextual();
+      return SlowIsUndeclaredGlobal();
     } else {
-      ASSERT(!SlowIsContextual());
+      ASSERT(!SlowIsUndeclaredGlobal());
       return false;
     }
   }
 
-  bool SlowIsContextual() {
+  bool SlowIsUndeclaredGlobal() {
     return ComputeMode() == RelocInfo::CODE_TARGET_CONTEXT;
   }
 

src/stub-cache.cc

@@ -1071,7 +1071,7 @@ static MaybeObject* ThrowReferenceError(String* name) {
   // can't use either LoadIC or KeyedLoadIC constructors.
   IC ic(IC::NO_EXTRA_FRAME, Isolate::Current());
   ASSERT(ic.target()->is_load_stub() || ic.target()->is_keyed_load_stub());
-  if (!ic.SlowIsContextual()) return HEAP->undefined_value();
+  if (!ic.SlowIsUndeclaredGlobal()) return HEAP->undefined_value();
 
   // Throw a reference error.
   HandleScope scope;

test/cctest/cctest.gyp

@@ -69,6 +69,7 @@
         'test-fixed-dtoa.cc',
         'test-flags.cc',
         'test-func-name-inference.cc',
+        'test-global-object.cc',
         'test-hashing.cc',
         'test-hashmap.cc',
         'test-heap.cc',

test/cctest/test-global-object.cc

+// Copyright 2013 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "v8.h"
+
+#include "cctest.h"
+
+using namespace v8;
+
+// This test fails if properties on the prototype of the global object appear
+// as declared globals.
+TEST(StrictUndeclaredGlobalVariable) {
+  HandleScope scope;
+  v8::Local<v8::String> var_name = v8_str("x");
+  LocalContext context;
+  v8::TryCatch try_catch;
+  v8::Local<v8::Script> script = v8_compile("\"use strict\"; x = 42;");
+  v8::Handle<v8::Object> proto = v8::Object::New();
+  v8::Handle<v8::Object> global =
+      context->Global()->GetPrototype().As<v8::Object>();
+  proto->Set(var_name, v8_num(100));
+  global->SetPrototype(proto);
+  script->Run();
+  CHECK(try_catch.HasCaught());
+  v8::String::Utf8Value exception(try_catch.Exception());
+  CHECK_EQ("ReferenceError: x is not defined", *exception);
+}