Implement pixel array elements access in the presence of an

interceptor that does not handle the elements load.

Review URL: http://codereview.chromium.org/6551001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6869 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -6666,7 +6666,6 @@ bool JSObject::HasElementPostInterceptor(JSObject* receiver, uint32_t index) {
       break;
     }
     case PIXEL_ELEMENTS: {
-      // TODO(iposva): Add testcase.
       PixelArray* pixels = PixelArray::cast(elements());
       if (index < static_cast<uint32_t>(pixels->length())) {
         return true;
@@ -6680,7 +6679,6 @@ bool JSObject::HasElementPostInterceptor(JSObject* receiver, uint32_t index) {
     case EXTERNAL_INT_ELEMENTS:
     case EXTERNAL_UNSIGNED_INT_ELEMENTS:
     case EXTERNAL_FLOAT_ELEMENTS: {
-      // TODO(kbr): Add testcase.
       ExternalArray* array = ExternalArray::cast(elements());
       if (index < static_cast<uint32_t>(array->length())) {
         return true;
@@ -7271,11 +7269,7 @@ MaybeObject* JSObject::GetElementPostInterceptor(Object* receiver,
       }
       break;
     }
-    case PIXEL_ELEMENTS: {
-      // TODO(iposva): Add testcase and implement.
-      UNIMPLEMENTED();
-      break;
-    }
+    case PIXEL_ELEMENTS:
     case EXTERNAL_BYTE_ELEMENTS:
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
     case EXTERNAL_SHORT_ELEMENTS:
@@ -7283,8 +7277,8 @@ MaybeObject* JSObject::GetElementPostInterceptor(Object* receiver,
     case EXTERNAL_INT_ELEMENTS:
     case EXTERNAL_UNSIGNED_INT_ELEMENTS:
     case EXTERNAL_FLOAT_ELEMENTS: {
-      // TODO(kbr): Add testcase and implement.
-      UNIMPLEMENTED();
+      MaybeObject* value = GetExternalElement(index);
+      if (!value->ToObjectUnchecked()->IsUndefined()) return value;
       break;
     }
     case DICTIONARY_ELEMENTS: {
@@ -7372,6 +7366,46 @@ MaybeObject* JSObject::GetElementWithReceiver(Object* receiver,
       }
       break;
     }
+    case PIXEL_ELEMENTS:
+    case EXTERNAL_BYTE_ELEMENTS:
+    case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
+    case EXTERNAL_SHORT_ELEMENTS:
+    case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
+    case EXTERNAL_INT_ELEMENTS:
+    case EXTERNAL_UNSIGNED_INT_ELEMENTS:
+    case EXTERNAL_FLOAT_ELEMENTS: {
+      MaybeObject* value = GetExternalElement(index);
+      if (!value->ToObjectUnchecked()->IsUndefined()) return value;
+      break;
+    }
+    case DICTIONARY_ELEMENTS: {
+      NumberDictionary* dictionary = element_dictionary();
+      int entry = dictionary->FindEntry(index);
+      if (entry != NumberDictionary::kNotFound) {
+        Object* element = dictionary->ValueAt(entry);
+        PropertyDetails details = dictionary->DetailsAt(entry);
+        if (details.type() == CALLBACKS) {
+          return GetElementWithCallback(receiver,
+                                        element,
+                                        index,
+                                        this);
+        }
+        return element;
+      }
+      break;
+    }
+  }
+
+  Object* pt = GetPrototype();
+  if (pt == Heap::null_value()) return Heap::undefined_value();
+  return pt->GetElementWithReceiver(receiver, index);
+}
+
+
+MaybeObject* JSObject::GetExternalElement(uint32_t index) {
+  // Get element works for both JSObject and JSArray since
+  // JSArray::length cannot change.
+  switch (GetElementsKind()) {
     case PIXEL_ELEMENTS: {
       PixelArray* pixels = PixelArray::cast(elements());
       if (index < static_cast<uint32_t>(pixels->length())) {
@@ -7439,27 +7473,12 @@ MaybeObject* JSObject::GetElementWithReceiver(Object* receiver,
       }
       break;
     }
-    case DICTIONARY_ELEMENTS: {
-      NumberDictionary* dictionary = element_dictionary();
-      int entry = dictionary->FindEntry(index);
-      if (entry != NumberDictionary::kNotFound) {
-        Object* element = dictionary->ValueAt(entry);
-        PropertyDetails details = dictionary->DetailsAt(entry);
-        if (details.type() == CALLBACKS) {
-          return GetElementWithCallback(receiver,
-                                        element,
-                                        index,
-                                        this);
-        }
-        return element;
-      }
+    case FAST_ELEMENTS:
+    case DICTIONARY_ELEMENTS:
+      UNREACHABLE();
       break;
-    }
   }
-
-  Object* pt = GetPrototype();
-  if (pt == Heap::null_value()) return Heap::undefined_value();
-  return pt->GetElementWithReceiver(receiver, index);
+  return Heap::undefined_value();
 }
 
 

src/objects.h

@@ -1549,6 +1549,11 @@ class JSObject: public HeapObject {
   MaybeObject* GetElementWithReceiver(Object* receiver, uint32_t index);
   MaybeObject* GetElementWithInterceptor(Object* receiver, uint32_t index);
 
+  // Get external element value at index if there is one and undefined
+  // otherwise. Can return a failure if allocation of a heap number
+  // failed.
+  MaybeObject* GetExternalElement(uint32_t index);
+
   MUST_USE_RESULT MaybeObject* SetFastElementsCapacityAndLength(int capacity,
                                                                 int length);
   MUST_USE_RESULT MaybeObject* SetSlowElements(Object* length);

test/cctest/test-api.cc

@@ -10883,6 +10883,53 @@ THREADED_TEST(PixelArrayInfo) {
 }
 
 
+static v8::Handle<Value> NotHandledIndexedPropertyGetter(
+    uint32_t index,
+    const AccessorInfo& info) {
+  ApiTestFuzzer::Fuzz();
+  return v8::Handle<Value>();
+}
+
+
+static v8::Handle<Value> NotHandledIndexedPropertySetter(
+    uint32_t index,
+    Local<Value> value,
+    const AccessorInfo& info) {
+  ApiTestFuzzer::Fuzz();
+  return v8::Handle<Value>();
+}
+
+
+THREADED_TEST(PixelArrayWithInterceptor) {
+  v8::HandleScope scope;
+  LocalContext context;
+  const int kElementCount = 260;
+  uint8_t* pixel_data = reinterpret_cast<uint8_t*>(malloc(kElementCount));
+  i::Handle<i::PixelArray> pixels =
+      i::Factory::NewPixelArray(kElementCount, pixel_data);
+  for (int i = 0; i < kElementCount; i++) {
+    pixels->set(i, i % 256);
+  }
+  v8::Handle<v8::ObjectTemplate> templ = v8::ObjectTemplate::New();
+  templ->SetIndexedPropertyHandler(NotHandledIndexedPropertyGetter,
+                                   NotHandledIndexedPropertySetter);
+  v8::Handle<v8::Object> obj = templ->NewInstance();
+  obj->SetIndexedPropertiesToPixelData(pixel_data, kElementCount);
+  context->Global()->Set(v8_str("pixels"), obj);
+  v8::Handle<v8::Value> result = CompileRun("pixels[1]");
+  CHECK_EQ(1, result->Int32Value());
+  result = CompileRun("var sum = 0;"
+                      "for (var i = 0; i < 8; i++) {"
+                      "  sum += pixels[i] = pixels[i] = -i;"
+                      "}"
+                      "sum;");
+  CHECK_EQ(-28, result->Int32Value());
+  result = CompileRun("pixels.hasOwnProperty('1')");
+  CHECK(result->BooleanValue());
+  free(pixel_data);
+}
+
+
 static int ExternalArrayElementSize(v8::ExternalArrayType array_type) {
   switch (array_type) {
     case v8::kExternalByteArray: