Implement implicit instance checks for API accessors.

test/cctest/test-api.cc

 // Copyright 2012 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 16575 matching lines @@
   v8::V8::SetFatalErrorHandler(CountingErrorCallback);
   v8::Utils::ReportApiFailure("StringEmpty()", "Kill V8");
   i::Isolate::Current()->TearDown();
   CHECK(!i::Internals::IsInitialized(isolate));
   CHECK_EQ(1, fatal_error_callback_counter);
   CHECK(v8::String::Empty().IsEmpty());
   CHECK_EQ(2, fatal_error_callback_counter);
   CHECK(v8::String::Empty(isolate).IsEmpty());
   CHECK_EQ(3, fatal_error_callback_counter);
 }
+
+
+static int instance_checked_getter_count = 0;
+static Handle<Value> InstanceCheckedGetter(Local<String> name,
+                                           const AccessorInfo& info) {
+  CHECK_EQ(name, v8_str("foo"));
+  instance_checked_getter_count++;
+  return v8_num(11);
+}
+
+
+static int instance_checked_setter_count = 0;
+static void InstanceCheckedSetter(Local<String> name,
+                      Local<Value> value,
+                      const AccessorInfo& info) {
+  CHECK_EQ(name, v8_str("foo"));
+  CHECK_EQ(value, v8_num(23));
+  instance_checked_setter_count++;
+}
+
+
+static void CheckInstanceCheckedResult(int getters,
+                                       int setters,
+                                       bool expects_callbacks,
+                                       TryCatch* try_catch) {
+  if (expects_callbacks) {
+    CHECK(!try_catch->HasCaught());
+    CHECK_EQ(getters, instance_checked_getter_count);
+    CHECK_EQ(setters, instance_checked_setter_count);
+  } else {
+    CHECK(try_catch->HasCaught());
+    CHECK_EQ(0, instance_checked_getter_count);
+    CHECK_EQ(0, instance_checked_setter_count);
+  }
+  try_catch->Reset();
+}
+
+
+static void CheckInstanceCheckedAccessors(bool expects_callbacks) {
+  instance_checked_getter_count = 0;
+  instance_checked_setter_count = 0;
+  TryCatch try_catch;
+
+  // Test path through generic runtime code.
+  CompileRun("obj.foo");
+  CheckInstanceCheckedResult(1, 0, expects_callbacks, &try_catch);
+  CompileRun("obj.foo = 23");
+  CheckInstanceCheckedResult(1, 1, expects_callbacks, &try_catch);
+
+  // Test path through generated LoadIC and StoredIC.
+  CompileRun("function test_get(o) { o.foo; }"
+             "test_get(obj);");
+  CheckInstanceCheckedResult(2, 1, expects_callbacks, &try_catch);
+  CompileRun("test_get(obj);");
+  CheckInstanceCheckedResult(3, 1, expects_callbacks, &try_catch);
+  CompileRun("test_get(obj);");
+  CheckInstanceCheckedResult(4, 1, expects_callbacks, &try_catch);
+  CompileRun("function test_set(o) { o.foo = 23; }"
+             "test_set(obj);");
+  CheckInstanceCheckedResult(4, 2, expects_callbacks, &try_catch);
+  CompileRun("test_set(obj);");
+  CheckInstanceCheckedResult(4, 3, expects_callbacks, &try_catch);
+  CompileRun("test_set(obj);");
+  CheckInstanceCheckedResult(4, 4, expects_callbacks, &try_catch);
+
+  // Test path through optimized code.
+  CompileRun("%OptimizeFunctionOnNextCall(test_get);"
+             "test_get(obj);");
+  CheckInstanceCheckedResult(5, 4, expects_callbacks, &try_catch);
+  CompileRun("%OptimizeFunctionOnNextCall(test_set);"
+             "test_set(obj);");
+  CheckInstanceCheckedResult(5, 5, expects_callbacks, &try_catch);
+
+  // Cleanup so that closures start out fresh in next check.
+  CompileRun("%DeoptimizeFunction(test_get);"
+             "%ClearFunctionTypeFeedback(test_get);"
+             "%DeoptimizeFunction(test_set);"
+             "%ClearFunctionTypeFeedback(test_set);");
+}
+
+
+THREADED_TEST(InstanceCheckOnInstanceAccessor) {
+  v8::internal::FLAG_allow_natives_syntax = true;
+  v8::HandleScope scope;
+  LocalContext context;
+
+  Local<FunctionTemplate> templ = FunctionTemplate::New();
+  Local<ObjectTemplate> inst = templ->InstanceTemplate();
+  inst->SetAccessor(v8_str("foo"),
+                    InstanceCheckedGetter, InstanceCheckedSetter,
+                    Handle<Value>(),
+                    v8::DEFAULT,
+                    v8::None,
+                    v8::AccessorSignature::New(templ));
+  context->Global()->Set(v8_str("f"), templ->GetFunction());
+
+  printf("Testing positive ...\n");
+  CompileRun("var obj = new f();");
+  CHECK(templ->HasInstance(context->Global()->Get(v8_str("obj"))));
+  CheckInstanceCheckedAccessors(true);
+
+  printf("Testing negative ...\n");
+  CompileRun("var obj = {};"
+             "obj.__proto__ = new f();");
+  CHECK(!templ->HasInstance(context->Global()->Get(v8_str("obj"))));
+  CheckInstanceCheckedAccessors(false);
+}
+
+
+THREADED_TEST(InstanceCheckOnInstanceAccessorWithInterceptor) {
+  v8::internal::FLAG_allow_natives_syntax = true;
+  v8::HandleScope scope;
+  LocalContext context;
+
+  Local<FunctionTemplate> templ = FunctionTemplate::New();
+  Local<ObjectTemplate> inst = templ->InstanceTemplate();
+  AddInterceptor(templ, EmptyInterceptorGetter, EmptyInterceptorSetter);
+  inst->SetAccessor(v8_str("foo"),
+                    InstanceCheckedGetter, InstanceCheckedSetter,
+                    Handle<Value>(),
+                    v8::DEFAULT,
+                    v8::None,
+                    v8::AccessorSignature::New(templ));
+  context->Global()->Set(v8_str("f"), templ->GetFunction());
+
+  printf("Testing positive ...\n");
+  CompileRun("var obj = new f();");
+  CHECK(templ->HasInstance(context->Global()->Get(v8_str("obj"))));
+  CheckInstanceCheckedAccessors(true);
+
+  printf("Testing negative ...\n");
+  CompileRun("var obj = {};"
+             "obj.__proto__ = new f();");
+  CHECK(!templ->HasInstance(context->Global()->Get(v8_str("obj"))));
+  CheckInstanceCheckedAccessors(false);
+}
+
+
+THREADED_TEST(InstanceCheckOnPrototypeAccessor) {
+  v8::internal::FLAG_allow_natives_syntax = true;
+  v8::HandleScope scope;
+  LocalContext context;
+
+  Local<FunctionTemplate> templ = FunctionTemplate::New();
+  Local<ObjectTemplate> proto = templ->PrototypeTemplate();
+  proto->SetAccessor(v8_str("foo"),
+                     InstanceCheckedGetter, InstanceCheckedSetter,
+                     Handle<Value>(),
+                     v8::DEFAULT,
+                     v8::None,
+                     v8::AccessorSignature::New(templ));
+  context->Global()->Set(v8_str("f"), templ->GetFunction());
+
+  printf("Testing positive ...\n");
+  CompileRun("var obj = new f();");
+  CHECK(templ->HasInstance(context->Global()->Get(v8_str("obj"))));
+  CheckInstanceCheckedAccessors(true);
+
+  printf("Testing negative ...\n");
+  CompileRun("var obj = {};"
+             "obj.__proto__ = new f();");
+  CHECK(!templ->HasInstance(context->Global()->Get(v8_str("obj"))));
+  CheckInstanceCheckedAccessors(false);
+
+  printf("Testing positive with modified prototype chain ...\n");
+  CompileRun("var obj = new f();"
+             "var pro = {};"
+             "pro.__proto__ = obj.__proto__;"
+             "obj.__proto__ = pro;");
+  CHECK(templ->HasInstance(context->Global()->Get(v8_str("obj"))));
+  CheckInstanceCheckedAccessors(true);
+}