Added API for getting object mirrors

Added Debug::GetMirror call to get a mirror for a given object.

Review URL: http://codereview.chromium.org/172045


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2700 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8-debug.h

@@ -228,9 +228,14 @@ class EXPORT Debug {
   *   }
   * \endcode
   */
-  static Handle<Value> Call(v8::Handle<v8::Function> fun,
+  static Local<Value> Call(v8::Handle<v8::Function> fun,
                             Handle<Value> data = Handle<Value>());
 
+  /**
+   * Returns a mirror object for the given object.
+   */
+  static Local<Value> GetMirror(v8::Handle<v8::Value> obj);
+
  /**
   * Enable the V8 builtin debug agent. The debugger agent will listen on the
   * supplied TCP/IP port for remote debugger connection.

src/api.cc

@@ -3595,10 +3595,10 @@ void Debug::SetHostDispatchHandler(HostDispatchHandler handler,
 }
 
 
-Handle<Value> Debug::Call(v8::Handle<v8::Function> fun,
-                          v8::Handle<v8::Value> data) {
-  if (!i::V8::IsRunning()) return Handle<Value>();
-  ON_BAILOUT("v8::Debug::Call()", return Handle<Value>());
+Local<Value> Debug::Call(v8::Handle<v8::Function> fun,
+                         v8::Handle<v8::Value> data) {
+  if (!i::V8::IsRunning()) return Local<Value>();
+  ON_BAILOUT("v8::Debug::Call()", return Local<Value>());
   ENTER_V8;
   i::Handle<i::Object> result;
   EXCEPTION_PREAMBLE();
@@ -3616,6 +3616,28 @@ Handle<Value> Debug::Call(v8::Handle<v8::Function> fun,
 }
 
 
+Local<Value> Debug::GetMirror(v8::Handle<v8::Value> obj) {
+  if (!i::V8::IsRunning()) return Local<Value>();
+  ON_BAILOUT("v8::Debug::GetMirror()", return Local<Value>());
+  ENTER_V8;
+  v8::HandleScope scope;
+  i::Debug::Load();
+  i::Handle<i::JSObject> debug(i::Debug::debug_context()->global());
+  i::Handle<i::String> name = i::Factory::LookupAsciiSymbol("MakeMirror");
+  i::Handle<i::Object> fun_obj = i::GetProperty(debug, name);
+  i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>::cast(fun_obj);
+  v8::Handle<v8::Function> v8_fun = Utils::ToLocal(fun);
+  const int kArgc = 1;
+  v8::Handle<v8::Value> argv[kArgc] = { obj };
+  EXCEPTION_PREAMBLE();
+  v8::Handle<v8::Value> result = v8_fun->Call(Utils::ToLocal(debug),
+                                              kArgc,
+                                              argv);
+  EXCEPTION_BAILOUT_CHECK(Local<Value>());
+  return scope.Close(result);
+}
+
+
 bool Debug::EnableAgent(const char* name, int port) {
   return i::Debugger::StartAgent(name, port);
 }

test/cctest/test-debug.cc

@@ -5357,3 +5357,20 @@ TEST(NoDebugBreakInAfterCompileMessageHandler) {
   v8::Debug::SetMessageHandler2(NULL);
   CheckDebuggerUnloaded();
 }
+
+
+TEST(GetMirror) {
+  v8::HandleScope scope;
+  DebugLocalContext env;
+  v8::Handle<v8::Value> obj = v8::Debug::GetMirror(v8::String::New("hodja"));
+  v8::Handle<v8::Function> run_test = v8::Handle<v8::Function>::Cast(
+      v8::Script::New(
+          v8::String::New(
+              "function runTest(mirror) {"
+              "  return mirror.isString() && (mirror.length() == 5);"
+              "}"
+              ""
+              "runTest;"))->Run());
+  v8::Handle<v8::Value> result = run_test->Call(env->Global(), 1, &obj);
+  CHECK(result->IsTrue());
+}