When inspecting a function with a native getter return result of execution of...

When inspecting a function with a native getter return result of execution of the getter function in the client context. This is useful for debugging DOM elements.
Review URL: http://codereview.chromium.org/113821

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2044 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -5486,7 +5486,8 @@ static int LocalPrototypeChainLength(JSObject* obj) {
 }
 
 
-static Object* DebugLookupResultValue(Object* receiver, LookupResult* result,
+static Object* DebugLookupResultValue(Object* receiver, String* name,
+                                      LookupResult* result,
                                       bool* caught_exception) {
   Object* value;
   switch (result->type()) {
@@ -5511,11 +5512,18 @@ static Object* DebugLookupResultValue(Object* receiver, LookupResult* result,
       return result->GetConstantFunction();
     case CALLBACKS: {
       Object* structure = result->GetCallbackObject();
-      if (structure->IsProxy()) {
-        AccessorDescriptor* callback =
-            reinterpret_cast<AccessorDescriptor*>(
-                Proxy::cast(structure)->proxy());
-        value = (callback->getter)(receiver, callback->data);
+      if (structure->IsProxy() || structure->IsAccessorInfo()) {
+        if (Debug::debugger_entry()) {
+          // SaveContext scope. It will restore debugger context after the
+          // getter execution.
+          SaveContext save;
+          Top::set_context(*Debug::debugger_entry()->GetContext());
+          value = receiver->GetPropertyWithCallback(
+              receiver, structure, name, result->holder());
+        } else {
+          value = receiver->GetPropertyWithCallback(
+              receiver, structure, name, result->holder());
+        }
         if (value->IsException()) {
           value = Top::pending_exception();
           Top::clear_pending_exception();
@@ -5596,7 +5604,7 @@ static Object* Runtime_DebugGetPropertyDetails(Arguments args) {
 
   if (result.IsProperty()) {
     bool caught_exception = false;
-    Object* value = DebugLookupResultValue(*obj, &result,
+    Object* value = DebugLookupResultValue(*obj, *name, &result,
                                            &caught_exception);
     if (value->IsFailure()) return value;
     Handle<Object> value_handle(value);
@@ -5632,7 +5640,7 @@ static Object* Runtime_DebugGetProperty(Arguments args) {
   LookupResult result;
   obj->Lookup(*name, &result);
   if (result.IsProperty()) {
-    return DebugLookupResultValue(*obj, &result, NULL);
+    return DebugLookupResultValue(*obj, *name, &result, NULL);
   }
   return Heap::undefined_value();
 }

test/cctest/test-debug.cc

@@ -3313,6 +3313,82 @@ TEST(HiddenPrototypePropertyMirror) {
 }
 
 
+static v8::Handle<v8::Value> ProtperyXNativeGetter(
+    v8::Local<v8::String> property, const v8::AccessorInfo& info) {
+  return v8::Integer::New(10);
+}
+
+
+TEST(NativeGetterPropertyMirror) {
+  // Create a V8 environment with debug access.
+  v8::HandleScope scope;
+  DebugLocalContext env;
+  env.ExposeDebug();
+
+  v8::Handle<v8::String> name = v8::String::New("x");
+  // Create object with named accessor.
+  v8::Handle<v8::ObjectTemplate> named = v8::ObjectTemplate::New();
+  named->SetAccessor(name, &ProtperyXNativeGetter, NULL,
+      v8::Handle<v8::Value>(), v8::DEFAULT, v8::None);
+
+  // Create object with named property getter.
+  env->Global()->Set(v8::String::New("instance"), named->NewInstance());
+  CHECK_EQ(10, CompileRun("instance.x")->Int32Value());
+
+  // Get mirror for the object with property getter.
+  CompileRun("instance_mirror = debug.MakeMirror(instance);");
+  CHECK(CompileRun(
+      "instance_mirror instanceof debug.ObjectMirror")->BooleanValue());
+
+  CompileRun("named_names = instance_mirror.propertyNames();");
+  CHECK_EQ(1, CompileRun("named_names.length")->Int32Value());
+  CHECK(CompileRun("named_names[0] == 'x'")->BooleanValue());
+  CHECK(CompileRun(
+      "instance_mirror.property('x').value().isNumber()")->BooleanValue());
+  CHECK(CompileRun(
+      "instance_mirror.property('x').value().value() == 10")->BooleanValue());
+}
+
+
+static v8::Handle<v8::Value> ProtperyXNativeGetterThrowingError(
+    v8::Local<v8::String> property, const v8::AccessorInfo& info) {
+  return CompileRun("throw new Error('Error message');");
+}
+
+
+TEST(NativeGetterThrowingErrorPropertyMirror) {
+  // Create a V8 environment with debug access.
+  v8::HandleScope scope;
+  DebugLocalContext env;
+  env.ExposeDebug();
+
+  v8::Handle<v8::String> name = v8::String::New("x");
+  // Create object with named accessor.
+  v8::Handle<v8::ObjectTemplate> named = v8::ObjectTemplate::New();
+  named->SetAccessor(name, &ProtperyXNativeGetterThrowingError, NULL,
+      v8::Handle<v8::Value>(), v8::DEFAULT, v8::None);
+
+  // Create object with named property getter.
+  env->Global()->Set(v8::String::New("instance"), named->NewInstance());
+
+  // Get mirror for the object with property getter.
+  CompileRun("instance_mirror = debug.MakeMirror(instance);");
+  CHECK(CompileRun(
+      "instance_mirror instanceof debug.ObjectMirror")->BooleanValue());
+  CompileRun("named_names = instance_mirror.propertyNames();");
+  CHECK_EQ(1, CompileRun("named_names.length")->Int32Value());
+  CHECK(CompileRun("named_names[0] == 'x'")->BooleanValue());
+  CHECK(CompileRun(
+      "instance_mirror.property('x').value().isError()")->BooleanValue());
+
+  // Check that the message is that passed to the Error constructor.
+  CHECK(CompileRun(
+      "instance_mirror.property('x').value().message() == 'Error message'")->
+          BooleanValue());
+}
+
+
+
 // Multithreaded tests of JSON debugger protocol
 
 // Support classes