Return the original value when assigning to a pixel array

test/cctest/test-api.cc

 // Copyright 2007-2008 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
@@ skipping 7711 matching lines @@
   // Set the elements to be the pixels.
   // jsobj->set_elements(*pixels);
   obj->SetIndexedPropertiesToPixelData(pixel_data, kElementCount);
   CHECK_EQ(1, i::Smi::cast(jsobj->GetElement(1))->value());
   obj->Set(v8_str("field"), v8::Int32::New(1503));
   context->Global()->Set(v8_str("pixels"), obj);
   v8::Handle<v8::Value> result = CompileRun("pixels.field");
   CHECK_EQ(1503, result->Int32Value());
   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("var sum = 0;"
+                      "for (var i = 0; i < 8; i++) {"
+                      "  sum += pixels[i] = pixels[i] = 0;"
+                      "}"
+                      "sum;");
+  CHECK_EQ(0, result->Int32Value());
+
+  result = CompileRun("var sum = 0;"
+                      "for (var i = 0; i < 8; i++) {"
+                      "  sum += pixels[i] = pixels[i] = 255;"
+                      "}"
+                      "sum;");
+  CHECK_EQ(8 * 255, result->Int32Value());
+
+  result = CompileRun("var sum = 0;"
+                      "for (var i = 0; i < 8; i++) {"
+                      "  sum += pixels[i] = pixels[i] = 256 + i;"
+                      "}"
+                      "sum;");
+  CHECK_EQ(2076, 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("var sum = 0;"
                       "for (var i = 0; i < 8; i++) {"
                       "  sum += pixels[i];"
                       "}"
                       "sum;");
   CHECK_EQ(28, result->Int32Value());
 
   i::Handle<i::Smi> value(i::Smi::FromInt(2));
   i::SetElement(jsobj, 1, value);
   CHECK_EQ(2, i::Smi::cast(jsobj->GetElement(1))->value());
@@ skipping 90 matching lines @@
                       "js_array;");
   CHECK_EQ(77, v8::Object::Cast(*result)->Get(v8_str("0"))->Int32Value());
 
   result = CompileRun("pixels[1] = 23;"
                       "pixels.__proto__ = [];"
                       "js_array.__proto__ = pixels;"
                       "js_array.concat(pixels);");
   CHECK_EQ(77, v8::Object::Cast(*result)->Get(v8_str("0"))->Int32Value());
   CHECK_EQ(23, v8::Object::Cast(*result)->Get(v8_str("1"))->Int32Value());
 
+  result = CompileRun("pixels[1] = 23;");
+  CHECK_EQ(23, result->Int32Value());
+
   free(pixel_data);
 }
 
 
 THREADED_TEST(ScriptContextDependence) {
   v8::HandleScope scope;
   LocalContext c1;
   const char *source = "foo";
   v8::Handle<v8::Script> dep = v8::Script::Compile(v8::String::New(source));
   v8::Handle<v8::Script> indep = v8::Script::New(v8::String::New(source));
@@ skipping 20 matching lines @@
   CHECK(strstr(*stack, "at foo (stack-trace-test") != NULL);
 }
 
 
 // Test that idle notification can be handled when V8 has not yet been
 // set up.
 THREADED_TEST(IdleNotification) {
   for (int i = 0; i < 100; i++) v8::V8::IdleNotification(true);
   for (int i = 0; i < 100; i++) v8::V8::IdleNotification(false);
 }