Split yet more runtime functions into separate files.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/612383002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24323 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUILD.gn

@@ -831,13 +831,19 @@ source_set("v8_base") {
     "src/runtime/runtime-i18n.cc",
     "src/runtime/runtime-date.cc",
     "src/runtime/runtime-debug.cc",
+    "src/runtime/runtime-function.cc",
     "src/runtime/runtime-generator.cc",
     "src/runtime/runtime-json.cc",
+    "src/runtime/runtime-literals.cc",
     "src/runtime/runtime-liveedit.cc",
     "src/runtime/runtime-maths.cc",
     "src/runtime/runtime-numbers.cc",
+    "src/runtime/runtime-observe.cc",
+    "src/runtime/runtime-proxy.cc",
     "src/runtime/runtime-regexp.cc",
+    "src/runtime/runtime-scopes.cc",
     "src/runtime/runtime-strings.cc",
+    "src/runtime/runtime-symbol.cc",
     "src/runtime/runtime-test.cc",
     "src/runtime/runtime-typedarray.cc",
     "src/runtime/runtime-uri.cc",

src/runtime/runtime-function.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#include "src/accessors.h"
+#include "src/arguments.h"
+#include "src/compiler.h"
+#include "src/deoptimizer.h"
+#include "src/frames.h"
+#include "src/runtime/runtime.h"
+#include "src/runtime/runtime-utils.h"
+
+namespace v8 {
+namespace internal {
+
+RUNTIME_FUNCTION(Runtime_IsSloppyModeFunction) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSReceiver, callable, 0);
+  if (!callable->IsJSFunction()) {
+    HandleScope scope(isolate);
+    Handle<Object> delegate;
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+        isolate, delegate, Execution::TryGetFunctionDelegate(
+                               isolate, Handle<JSReceiver>(callable)));
+    callable = JSFunction::cast(*delegate);
+  }
+  JSFunction* function = JSFunction::cast(callable);
+  SharedFunctionInfo* shared = function->shared();
+  return isolate->heap()->ToBoolean(shared->strict_mode() == SLOPPY);
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetDefaultReceiver) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSReceiver, callable, 0);
+
+  if (!callable->IsJSFunction()) {
+    HandleScope scope(isolate);
+    Handle<Object> delegate;
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+        isolate, delegate, Execution::TryGetFunctionDelegate(
+                               isolate, Handle<JSReceiver>(callable)));
+    callable = JSFunction::cast(*delegate);
+  }
+  JSFunction* function = JSFunction::cast(callable);
+
+  SharedFunctionInfo* shared = function->shared();
+  if (shared->native() || shared->strict_mode() == STRICT) {
+    return isolate->heap()->undefined_value();
+  }
+  // Returns undefined for strict or native functions, or
+  // the associated global receiver for "normal" functions.
+
+  return function->global_proxy();
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionGetName) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+
+  CONVERT_ARG_CHECKED(JSFunction, f, 0);
+  return f->shared()->name();
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionSetName) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 2);
+
+  CONVERT_ARG_CHECKED(JSFunction, f, 0);
+  CONVERT_ARG_CHECKED(String, name, 1);
+  f->shared()->set_name(name);
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionNameShouldPrintAsAnonymous) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSFunction, f, 0);
+  return isolate->heap()->ToBoolean(
+      f->shared()->name_should_print_as_anonymous());
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionMarkNameShouldPrintAsAnonymous) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSFunction, f, 0);
+  f->shared()->set_name_should_print_as_anonymous(true);
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionIsArrow) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSFunction, f, 0);
+  return isolate->heap()->ToBoolean(f->shared()->is_arrow());
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionIsConciseMethod) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSFunction, f, 0);
+  return isolate->heap()->ToBoolean(f->shared()->is_concise_method());
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionRemovePrototype) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+
+  CONVERT_ARG_CHECKED(JSFunction, f, 0);
+  RUNTIME_ASSERT(f->RemovePrototype());
+
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionGetScript) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+
+  CONVERT_ARG_CHECKED(JSFunction, fun, 0);
+  Handle<Object> script = Handle<Object>(fun->shared()->script(), isolate);
+  if (!script->IsScript()) return isolate->heap()->undefined_value();
+
+  return *Script::GetWrapper(Handle<Script>::cast(script));
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionGetSourceCode) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, f, 0);
+  Handle<SharedFunctionInfo> shared(f->shared());
+  return *shared->GetSourceCode();
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionGetScriptSourcePosition) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+
+  CONVERT_ARG_CHECKED(JSFunction, fun, 0);
+  int pos = fun->shared()->start_position();
+  return Smi::FromInt(pos);
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionGetPositionForOffset) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 2);
+
+  CONVERT_ARG_CHECKED(Code, code, 0);
+  CONVERT_NUMBER_CHECKED(int, offset, Int32, args[1]);
+
+  RUNTIME_ASSERT(0 <= offset && offset < code->Size());
+
+  Address pc = code->address() + offset;
+  return Smi::FromInt(code->SourcePosition(pc));
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionSetInstanceClassName) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 2);
+
+  CONVERT_ARG_CHECKED(JSFunction, fun, 0);
+  CONVERT_ARG_CHECKED(String, name, 1);
+  fun->SetInstanceClassName(name);
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionSetLength) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 2);
+
+  CONVERT_ARG_CHECKED(JSFunction, fun, 0);
+  CONVERT_SMI_ARG_CHECKED(length, 1);
+  RUNTIME_ASSERT((length & 0xC0000000) == 0xC0000000 ||
+                 (length & 0xC0000000) == 0x0);
+  fun->shared()->set_length(length);
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionSetPrototype) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, fun, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
+  RUNTIME_ASSERT(fun->should_have_prototype());
+  Accessors::FunctionSetPrototype(fun, value);
+  return args[0];  // return TOS
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionIsAPIFunction) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+
+  CONVERT_ARG_CHECKED(JSFunction, f, 0);
+  return isolate->heap()->ToBoolean(f->shared()->IsApiFunction());
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionIsBuiltin) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+
+  CONVERT_ARG_CHECKED(JSFunction, f, 0);
+  return isolate->heap()->ToBoolean(f->IsBuiltin());
+}
+
+
+RUNTIME_FUNCTION(Runtime_SetCode) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, target, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, source, 1);
+
+  Handle<SharedFunctionInfo> target_shared(target->shared());
+  Handle<SharedFunctionInfo> source_shared(source->shared());
+  RUNTIME_ASSERT(!source_shared->bound());
+
+  if (!Compiler::EnsureCompiled(source, KEEP_EXCEPTION)) {
+    return isolate->heap()->exception();
+  }
+
+  // Mark both, the source and the target, as un-flushable because the
+  // shared unoptimized code makes them impossible to enqueue in a list.
+  DCHECK(target_shared->code()->gc_metadata() == NULL);
+  DCHECK(source_shared->code()->gc_metadata() == NULL);
+  target_shared->set_dont_flush(true);
+  source_shared->set_dont_flush(true);
+
+  // Set the code, scope info, formal parameter count, and the length
+  // of the target shared function info.
+  target_shared->ReplaceCode(source_shared->code());
+  target_shared->set_scope_info(source_shared->scope_info());
+  target_shared->set_length(source_shared->length());
+  target_shared->set_feedback_vector(source_shared->feedback_vector());
+  target_shared->set_formal_parameter_count(
+      source_shared->formal_parameter_count());
+  target_shared->set_script(source_shared->script());
+  target_shared->set_start_position_and_type(
+      source_shared->start_position_and_type());
+  target_shared->set_end_position(source_shared->end_position());
+  bool was_native = target_shared->native();
+  target_shared->set_compiler_hints(source_shared->compiler_hints());
+  target_shared->set_native(was_native);
+  target_shared->set_profiler_ticks(source_shared->profiler_ticks());
+
+  // Set the code of the target function.
+  target->ReplaceCode(source_shared->code());
+  DCHECK(target->next_function_link()->IsUndefined());
+
+  // Make sure we get a fresh copy of the literal vector to avoid cross
+  // context contamination.
+  Handle<Context> context(source->context());
+  int number_of_literals = source->NumberOfLiterals();
+  Handle<FixedArray> literals =
+      isolate->factory()->NewFixedArray(number_of_literals, TENURED);
+  if (number_of_literals > 0) {
+    literals->set(JSFunction::kLiteralNativeContextIndex,
+                  context->native_context());
+  }
+  target->set_context(*context);
+  target->set_literals(*literals);
+
+  if (isolate->logger()->is_logging_code_events() ||
+      isolate->cpu_profiler()->is_profiling()) {
+    isolate->logger()->LogExistingFunction(source_shared,
+                                           Handle<Code>(source_shared->code()));
+  }
+
+  return *target;
+}
+
+
+// Set the native flag on the function.
+// This is used to decide if we should transform null and undefined
+// into the global object when doing call and apply.
+RUNTIME_FUNCTION(Runtime_SetNativeFlag) {
+  SealHandleScope shs(isolate);
+  RUNTIME_ASSERT(args.length() == 1);
+
+  CONVERT_ARG_CHECKED(Object, object, 0);
+
+  if (object->IsJSFunction()) {
+    JSFunction* func = JSFunction::cast(object);
+    func->shared()->set_native(true);
+  }
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_SetInlineBuiltinFlag) {
+  SealHandleScope shs(isolate);
+  RUNTIME_ASSERT(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
+
+  if (object->IsJSFunction()) {
+    JSFunction* func = JSFunction::cast(*object);
+    func->shared()->set_inline_builtin(true);
+  }
+  return isolate->heap()->undefined_value();
+}
+
+
+// Find the arguments of the JavaScript function invocation that called
+// into C++ code. Collect these in a newly allocated array of handles (possibly
+// prefixed by a number of empty handles).
+static SmartArrayPointer<Handle<Object> > GetCallerArguments(Isolate* isolate,
+                                                             int prefix_argc,
+                                                             int* total_argc) {
+  // Find frame containing arguments passed to the caller.
+  JavaScriptFrameIterator it(isolate);
+  JavaScriptFrame* frame = it.frame();
+  List<JSFunction*> functions(2);
+  frame->GetFunctions(&functions);
+  if (functions.length() > 1) {
+    int inlined_jsframe_index = functions.length() - 1;
+    JSFunction* inlined_function = functions[inlined_jsframe_index];
+    SlotRefValueBuilder slot_refs(
+        frame, inlined_jsframe_index,
+        inlined_function->shared()->formal_parameter_count());
+
+    int args_count = slot_refs.args_length();
+
+    *total_argc = prefix_argc + args_count;
+    SmartArrayPointer<Handle<Object> > param_data(
+        NewArray<Handle<Object> >(*total_argc));
+    slot_refs.Prepare(isolate);
+    for (int i = 0; i < args_count; i++) {
+      Handle<Object> val = slot_refs.GetNext(isolate, 0);
+      param_data[prefix_argc + i] = val;
+    }
+    slot_refs.Finish(isolate);
+
+    return param_data;
+  } else {
+    it.AdvanceToArgumentsFrame();
+    frame = it.frame();
+    int args_count = frame->ComputeParametersCount();
+
+    *total_argc = prefix_argc + args_count;
+    SmartArrayPointer<Handle<Object> > param_data(
+        NewArray<Handle<Object> >(*total_argc));
+    for (int i = 0; i < args_count; i++) {
+      Handle<Object> val = Handle<Object>(frame->GetParameter(i), isolate);
+      param_data[prefix_argc + i] = val;
+    }
+    return param_data;
+  }
+}
+
+
+RUNTIME_FUNCTION(Runtime_FunctionBindArguments) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 4);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, bound_function, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, bindee, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, this_object, 2);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(new_length, 3);
+
+  // TODO(lrn): Create bound function in C++ code from premade shared info.
+  bound_function->shared()->set_bound(true);
+  // Get all arguments of calling function (Function.prototype.bind).
+  int argc = 0;
+  SmartArrayPointer<Handle<Object> > arguments =
+      GetCallerArguments(isolate, 0, &argc);
+  // Don't count the this-arg.
+  if (argc > 0) {
+    RUNTIME_ASSERT(arguments[0].is_identical_to(this_object));
+    argc--;
+  } else {
+    RUNTIME_ASSERT(this_object->IsUndefined());
+  }
+  // Initialize array of bindings (function, this, and any existing arguments
+  // if the function was already bound).
+  Handle<FixedArray> new_bindings;
+  int i;
+  if (bindee->IsJSFunction() && JSFunction::cast(*bindee)->shared()->bound()) {
+    Handle<FixedArray> old_bindings(
+        JSFunction::cast(*bindee)->function_bindings());
+    RUNTIME_ASSERT(old_bindings->length() > JSFunction::kBoundFunctionIndex);
+    new_bindings =
+        isolate->factory()->NewFixedArray(old_bindings->length() + argc);
+    bindee = Handle<Object>(old_bindings->get(JSFunction::kBoundFunctionIndex),
+                            isolate);
+    i = 0;
+    for (int n = old_bindings->length(); i < n; i++) {
+      new_bindings->set(i, old_bindings->get(i));
+    }
+  } else {
+    int array_size = JSFunction::kBoundArgumentsStartIndex + argc;
+    new_bindings = isolate->factory()->NewFixedArray(array_size);
+    new_bindings->set(JSFunction::kBoundFunctionIndex, *bindee);
+    new_bindings->set(JSFunction::kBoundThisIndex, *this_object);
+    i = 2;
+  }
+  // Copy arguments, skipping the first which is "this_arg".
+  for (int j = 0; j < argc; j++, i++) {
+    new_bindings->set(i, *arguments[j + 1]);
+  }
+  new_bindings->set_map_no_write_barrier(
+      isolate->heap()->fixed_cow_array_map());
+  bound_function->set_function_bindings(*new_bindings);
+
+  // Update length. Have to remove the prototype first so that map migration
+  // is happy about the number of fields.
+  RUNTIME_ASSERT(bound_function->RemovePrototype());
+  Handle<Map> bound_function_map(
+      isolate->native_context()->bound_function_map());
+  JSObject::MigrateToMap(bound_function, bound_function_map);
+  Handle<String> length_string = isolate->factory()->length_string();
+  PropertyAttributes attr =
+      static_cast<PropertyAttributes>(DONT_DELETE | DONT_ENUM | READ_ONLY);
+  RETURN_FAILURE_ON_EXCEPTION(
+      isolate, JSObject::SetOwnPropertyIgnoreAttributes(
+                   bound_function, length_string, new_length, attr));
+  return *bound_function;
+}
+
+
+RUNTIME_FUNCTION(Runtime_BoundFunctionGetBindings) {
+  HandleScope handles(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, callable, 0);
+  if (callable->IsJSFunction()) {
+    Handle<JSFunction> function = Handle<JSFunction>::cast(callable);
+    if (function->shared()->bound()) {
+      Handle<FixedArray> bindings(function->function_bindings());
+      RUNTIME_ASSERT(bindings->map() == isolate->heap()->fixed_cow_array_map());
+      return *isolate->factory()->NewJSArrayWithElements(bindings);
+    }
+  }
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_NewObjectFromBound) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  // First argument is a function to use as a constructor.
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
+  RUNTIME_ASSERT(function->shared()->bound());
+
+  // The argument is a bound function. Extract its bound arguments
+  // and callable.
+  Handle<FixedArray> bound_args =
+      Handle<FixedArray>(FixedArray::cast(function->function_bindings()));
+  int bound_argc = bound_args->length() - JSFunction::kBoundArgumentsStartIndex;
+  Handle<Object> bound_function(
+      JSReceiver::cast(bound_args->get(JSFunction::kBoundFunctionIndex)),
+      isolate);
+  DCHECK(!bound_function->IsJSFunction() ||
+         !Handle<JSFunction>::cast(bound_function)->shared()->bound());
+
+  int total_argc = 0;
+  SmartArrayPointer<Handle<Object> > param_data =
+      GetCallerArguments(isolate, bound_argc, &total_argc);
+  for (int i = 0; i < bound_argc; i++) {
+    param_data[i] = Handle<Object>(
+        bound_args->get(JSFunction::kBoundArgumentsStartIndex + i), isolate);
+  }
+
+  if (!bound_function->IsJSFunction()) {
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+        isolate, bound_function,
+        Execution::TryGetConstructorDelegate(isolate, bound_function));
+  }
+  DCHECK(bound_function->IsJSFunction());
+
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result, Execution::New(Handle<JSFunction>::cast(bound_function),
+                                      total_argc, param_data.get()));
+  return *result;
+}
+
+
+RUNTIME_FUNCTION(Runtime_Call) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() >= 2);
+  int argc = args.length() - 2;
+  CONVERT_ARG_CHECKED(JSReceiver, fun, argc + 1);
+  Object* receiver = args[0];
+
+  // If there are too many arguments, allocate argv via malloc.
+  const int argv_small_size = 10;
+  Handle<Object> argv_small_buffer[argv_small_size];
+  SmartArrayPointer<Handle<Object> > argv_large_buffer;
+  Handle<Object>* argv = argv_small_buffer;
+  if (argc > argv_small_size) {
+    argv = new Handle<Object>[argc];
+    if (argv == NULL) return isolate->StackOverflow();
+    argv_large_buffer = SmartArrayPointer<Handle<Object> >(argv);
+  }
+
+  for (int i = 0; i < argc; ++i) {
+    argv[i] = Handle<Object>(args[1 + i], isolate);
+  }
+
+  Handle<JSReceiver> hfun(fun);
+  Handle<Object> hreceiver(receiver, isolate);
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result,
+      Execution::Call(isolate, hfun, hreceiver, argc, argv, true));
+  return *result;
+}
+
+
+RUNTIME_FUNCTION(Runtime_Apply) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 5);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, fun, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, arguments, 2);
+  CONVERT_INT32_ARG_CHECKED(offset, 3);
+  CONVERT_INT32_ARG_CHECKED(argc, 4);
+  RUNTIME_ASSERT(offset >= 0);
+  // Loose upper bound to allow fuzzing. We'll most likely run out of
+  // stack space before hitting this limit.
+  static int kMaxArgc = 1000000;
+  RUNTIME_ASSERT(argc >= 0 && argc <= kMaxArgc);
+
+  // If there are too many arguments, allocate argv via malloc.
+  const int argv_small_size = 10;
+  Handle<Object> argv_small_buffer[argv_small_size];
+  SmartArrayPointer<Handle<Object> > argv_large_buffer;
+  Handle<Object>* argv = argv_small_buffer;
+  if (argc > argv_small_size) {
+    argv = new Handle<Object>[argc];
+    if (argv == NULL) return isolate->StackOverflow();
+    argv_large_buffer = SmartArrayPointer<Handle<Object> >(argv);
+  }
+
+  for (int i = 0; i < argc; ++i) {
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+        isolate, argv[i], Object::GetElement(isolate, arguments, offset + i));
+  }
+
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result,
+      Execution::Call(isolate, fun, receiver, argc, argv, true));
+  return *result;
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetFunctionDelegate) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
+  RUNTIME_ASSERT(!object->IsJSFunction());
+  return *Execution::GetFunctionDelegate(isolate, object);
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetConstructorDelegate) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
+  RUNTIME_ASSERT(!object->IsJSFunction());
+  return *Execution::GetConstructorDelegate(isolate, object);
+}
+
+
+RUNTIME_FUNCTION(RuntimeReference_CallFunction) {
+  SealHandleScope shs(isolate);
+  return __RT_impl_Runtime_Call(args, isolate);
+}
+
+
+RUNTIME_FUNCTION(RuntimeReference_IsConstructCall) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 0);
+  JavaScriptFrameIterator it(isolate);
+  JavaScriptFrame* frame = it.frame();
+  return isolate->heap()->ToBoolean(frame->IsConstructor());
+}
+
+
+RUNTIME_FUNCTION(RuntimeReference_IsFunction) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(Object, obj, 0);
+  return isolate->heap()->ToBoolean(obj->IsJSFunction());
+}
+}
+}  // namespace v8::internal

src/runtime/runtime-literals.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#include "src/allocation-site-scopes.h"
+#include "src/arguments.h"
+#include "src/ast.h"
+#include "src/parser.h"
+#include "src/runtime/runtime.h"
+#include "src/runtime/runtime-utils.h"
+
+namespace v8 {
+namespace internal {
+
+static Handle<Map> ComputeObjectLiteralMap(
+    Handle<Context> context, Handle<FixedArray> constant_properties,
+    bool* is_result_from_cache) {
+  Isolate* isolate = context->GetIsolate();
+  int properties_length = constant_properties->length();
+  int number_of_properties = properties_length / 2;
+  // Check that there are only internal strings and array indices among keys.
+  int number_of_string_keys = 0;
+  for (int p = 0; p != properties_length; p += 2) {
+    Object* key = constant_properties->get(p);
+    uint32_t element_index = 0;
+    if (key->IsInternalizedString()) {
+      number_of_string_keys++;
+    } else if (key->ToArrayIndex(&element_index)) {
+      // An index key does not require space in the property backing store.
+      number_of_properties--;
+    } else {
+      // Bail out as a non-internalized-string non-index key makes caching
+      // impossible.
+      // DCHECK to make sure that the if condition after the loop is false.
+      DCHECK(number_of_string_keys != number_of_properties);
+      break;
+    }
+  }
+  // If we only have internalized strings and array indices among keys then we
+  // can use the map cache in the native context.
+  const int kMaxKeys = 10;
+  if ((number_of_string_keys == number_of_properties) &&
+      (number_of_string_keys < kMaxKeys)) {
+    // Create the fixed array with the key.
+    Handle<FixedArray> keys =
+        isolate->factory()->NewFixedArray(number_of_string_keys);
+    if (number_of_string_keys > 0) {
+      int index = 0;
+      for (int p = 0; p < properties_length; p += 2) {
+        Object* key = constant_properties->get(p);
+        if (key->IsInternalizedString()) {
+          keys->set(index++, key);
+        }
+      }
+      DCHECK(index == number_of_string_keys);
+    }
+    *is_result_from_cache = true;
+    return isolate->factory()->ObjectLiteralMapFromCache(context, keys);
+  }
+  *is_result_from_cache = false;
+  return Map::Create(isolate, number_of_properties);
+}
+
+
+MUST_USE_RESULT static MaybeHandle<Object> CreateLiteralBoilerplate(
+    Isolate* isolate, Handle<FixedArray> literals,
+    Handle<FixedArray> constant_properties);
+
+
+MUST_USE_RESULT static MaybeHandle<Object> CreateObjectLiteralBoilerplate(
+    Isolate* isolate, Handle<FixedArray> literals,
+    Handle<FixedArray> constant_properties, bool should_have_fast_elements,
+    bool has_function_literal) {
+  // Get the native context from the literals array.  This is the
+  // context in which the function was created and we use the object
+  // function from this context to create the object literal.  We do
+  // not use the object function from the current native context
+  // because this might be the object function from another context
+  // which we should not have access to.
+  Handle<Context> context =
+      Handle<Context>(JSFunction::NativeContextFromLiterals(*literals));
+
+  // In case we have function literals, we want the object to be in
+  // slow properties mode for now. We don't go in the map cache because
+  // maps with constant functions can't be shared if the functions are
+  // not the same (which is the common case).
+  bool is_result_from_cache = false;
+  Handle<Map> map = has_function_literal
+                        ? Handle<Map>(context->object_function()->initial_map())
+                        : ComputeObjectLiteralMap(context, constant_properties,
+                                                  &is_result_from_cache);
+
+  PretenureFlag pretenure_flag =
+      isolate->heap()->InNewSpace(*literals) ? NOT_TENURED : TENURED;
+
+  Handle<JSObject> boilerplate =
+      isolate->factory()->NewJSObjectFromMap(map, pretenure_flag);
+
+  // Normalize the elements of the boilerplate to save space if needed.
+  if (!should_have_fast_elements) JSObject::NormalizeElements(boilerplate);
+
+  // Add the constant properties to the boilerplate.
+  int length = constant_properties->length();
+  bool should_transform =
+      !is_result_from_cache && boilerplate->HasFastProperties();
+  bool should_normalize = should_transform || has_function_literal;
+  if (should_normalize) {
+    // TODO(verwaest): We might not want to ever normalize here.
+    JSObject::NormalizeProperties(boilerplate, KEEP_INOBJECT_PROPERTIES,
+                                  length / 2);
+  }
+  // TODO(verwaest): Support tracking representations in the boilerplate.
+  for (int index = 0; index < length; index += 2) {
+    Handle<Object> key(constant_properties->get(index + 0), isolate);
+    Handle<Object> value(constant_properties->get(index + 1), isolate);
+    if (value->IsFixedArray()) {
+      // The value contains the constant_properties of a
+      // simple object or array literal.
+      Handle<FixedArray> array = Handle<FixedArray>::cast(value);
+      ASSIGN_RETURN_ON_EXCEPTION(
+          isolate, value, CreateLiteralBoilerplate(isolate, literals, array),
+          Object);
+    }
+    MaybeHandle<Object> maybe_result;
+    uint32_t element_index = 0;
+    if (key->IsInternalizedString()) {
+      if (Handle<String>::cast(key)->AsArrayIndex(&element_index)) {
+        // Array index as string (uint32).
+        if (value->IsUninitialized()) value = handle(Smi::FromInt(0), isolate);
+        maybe_result =
+            JSObject::SetOwnElement(boilerplate, element_index, value, SLOPPY);
+      } else {
+        Handle<String> name(String::cast(*key));
+        DCHECK(!name->AsArrayIndex(&element_index));
+        maybe_result = JSObject::SetOwnPropertyIgnoreAttributes(
+            boilerplate, name, value, NONE);
+      }
+    } else if (key->ToArrayIndex(&element_index)) {
+      // Array index (uint32).
+      if (value->IsUninitialized()) value = handle(Smi::FromInt(0), isolate);
+      maybe_result =
+          JSObject::SetOwnElement(boilerplate, element_index, value, SLOPPY);
+    } else {
+      // Non-uint32 number.
+      DCHECK(key->IsNumber());
+      double num = key->Number();
+      char arr[100];
+      Vector<char> buffer(arr, arraysize(arr));
+      const char* str = DoubleToCString(num, buffer);
+      Handle<String> name = isolate->factory()->NewStringFromAsciiChecked(str);
+      maybe_result = JSObject::SetOwnPropertyIgnoreAttributes(boilerplate, name,
+                                                              value, NONE);
+    }
+    // If setting the property on the boilerplate throws an
+    // exception, the exception is converted to an empty handle in
+    // the handle based operations.  In that case, we need to
+    // convert back to an exception.
+    RETURN_ON_EXCEPTION(isolate, maybe_result, Object);
+  }
+
+  // Transform to fast properties if necessary. For object literals with
+  // containing function literals we defer this operation until after all
+  // computed properties have been assigned so that we can generate
+  // constant function properties.
+  if (should_transform && !has_function_literal) {
+    JSObject::MigrateSlowToFast(boilerplate,
+                                boilerplate->map()->unused_property_fields());
+  }
+
+  return boilerplate;
+}
+
+
+MaybeHandle<Object> Runtime::CreateArrayLiteralBoilerplate(
+    Isolate* isolate, Handle<FixedArray> literals,
+    Handle<FixedArray> elements) {
+  // Create the JSArray.
+  Handle<JSFunction> constructor(
+      JSFunction::NativeContextFromLiterals(*literals)->array_function());
+
+  PretenureFlag pretenure_flag =
+      isolate->heap()->InNewSpace(*literals) ? NOT_TENURED : TENURED;
+
+  Handle<JSArray> object = Handle<JSArray>::cast(
+      isolate->factory()->NewJSObject(constructor, pretenure_flag));
+
+  ElementsKind constant_elements_kind =
+      static_cast<ElementsKind>(Smi::cast(elements->get(0))->value());
+  Handle<FixedArrayBase> constant_elements_values(
+      FixedArrayBase::cast(elements->get(1)));
+
+  {
+    DisallowHeapAllocation no_gc;
+    DCHECK(IsFastElementsKind(constant_elements_kind));
+    Context* native_context = isolate->context()->native_context();
+    Object* maps_array = native_context->js_array_maps();
+    DCHECK(!maps_array->IsUndefined());
+    Object* map = FixedArray::cast(maps_array)->get(constant_elements_kind);
+    object->set_map(Map::cast(map));
+  }
+
+  Handle<FixedArrayBase> copied_elements_values;
+  if (IsFastDoubleElementsKind(constant_elements_kind)) {
+    copied_elements_values = isolate->factory()->CopyFixedDoubleArray(
+        Handle<FixedDoubleArray>::cast(constant_elements_values));
+  } else {
+    DCHECK(IsFastSmiOrObjectElementsKind(constant_elements_kind));
+    const bool is_cow = (constant_elements_values->map() ==
+                         isolate->heap()->fixed_cow_array_map());
+    if (is_cow) {
+      copied_elements_values = constant_elements_values;
+#if DEBUG
+      Handle<FixedArray> fixed_array_values =
+          Handle<FixedArray>::cast(copied_elements_values);
+      for (int i = 0; i < fixed_array_values->length(); i++) {
+        DCHECK(!fixed_array_values->get(i)->IsFixedArray());
+      }
+#endif
+    } else {
+      Handle<FixedArray> fixed_array_values =
+          Handle<FixedArray>::cast(constant_elements_values);
+      Handle<FixedArray> fixed_array_values_copy =
+          isolate->factory()->CopyFixedArray(fixed_array_values);
+      copied_elements_values = fixed_array_values_copy;
+      for (int i = 0; i < fixed_array_values->length(); i++) {
+        if (fixed_array_values->get(i)->IsFixedArray()) {
+          // The value contains the constant_properties of a
+          // simple object or array literal.
+          Handle<FixedArray> fa(FixedArray::cast(fixed_array_values->get(i)));
+          Handle<Object> result;
+          ASSIGN_RETURN_ON_EXCEPTION(
+              isolate, result, CreateLiteralBoilerplate(isolate, literals, fa),
+              Object);
+          fixed_array_values_copy->set(i, *result);
+        }
+      }
+    }
+  }
+  object->set_elements(*copied_elements_values);
+  object->set_length(Smi::FromInt(copied_elements_values->length()));
+
+  JSObject::ValidateElements(object);
+  return object;
+}
+
+
+MUST_USE_RESULT static MaybeHandle<Object> CreateLiteralBoilerplate(
+    Isolate* isolate, Handle<FixedArray> literals, Handle<FixedArray> array) {
+  Handle<FixedArray> elements = CompileTimeValue::GetElements(array);
+  const bool kHasNoFunctionLiteral = false;
+  switch (CompileTimeValue::GetLiteralType(array)) {
+    case CompileTimeValue::OBJECT_LITERAL_FAST_ELEMENTS:
+      return CreateObjectLiteralBoilerplate(isolate, literals, elements, true,
+                                            kHasNoFunctionLiteral);
+    case CompileTimeValue::OBJECT_LITERAL_SLOW_ELEMENTS:
+      return CreateObjectLiteralBoilerplate(isolate, literals, elements, false,
+                                            kHasNoFunctionLiteral);
+    case CompileTimeValue::ARRAY_LITERAL:
+      return Runtime::CreateArrayLiteralBoilerplate(isolate, literals,
+                                                    elements);
+    default:
+      UNREACHABLE();
+      return MaybeHandle<Object>();
+  }
+}
+
+
+RUNTIME_FUNCTION(Runtime_CreateObjectLiteral) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 4);
+  CONVERT_ARG_HANDLE_CHECKED(FixedArray, literals, 0);
+  CONVERT_SMI_ARG_CHECKED(literals_index, 1);
+  CONVERT_ARG_HANDLE_CHECKED(FixedArray, constant_properties, 2);
+  CONVERT_SMI_ARG_CHECKED(flags, 3);
+  bool should_have_fast_elements = (flags & ObjectLiteral::kFastElements) != 0;
+  bool has_function_literal = (flags & ObjectLiteral::kHasFunction) != 0;
+
+  RUNTIME_ASSERT(literals_index >= 0 && literals_index < literals->length());
+
+  // Check if boilerplate exists. If not, create it first.
+  Handle<Object> literal_site(literals->get(literals_index), isolate);
+  Handle<AllocationSite> site;
+  Handle<JSObject> boilerplate;
+  if (*literal_site == isolate->heap()->undefined_value()) {
+    Handle<Object> raw_boilerplate;
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+        isolate, raw_boilerplate,
+        CreateObjectLiteralBoilerplate(isolate, literals, constant_properties,
+                                       should_have_fast_elements,
+                                       has_function_literal));
+    boilerplate = Handle<JSObject>::cast(raw_boilerplate);
+
+    AllocationSiteCreationContext creation_context(isolate);
+    site = creation_context.EnterNewScope();
+    RETURN_FAILURE_ON_EXCEPTION(
+        isolate, JSObject::DeepWalk(boilerplate, &creation_context));
+    creation_context.ExitScope(site, boilerplate);
+
+    // Update the functions literal and return the boilerplate.
+    literals->set(literals_index, *site);
+  } else {
+    site = Handle<AllocationSite>::cast(literal_site);
+    boilerplate =
+        Handle<JSObject>(JSObject::cast(site->transition_info()), isolate);
+  }
+
+  AllocationSiteUsageContext usage_context(isolate, site, true);
+  usage_context.EnterNewScope();
+  MaybeHandle<Object> maybe_copy =
+      JSObject::DeepCopy(boilerplate, &usage_context);
+  usage_context.ExitScope(site, boilerplate);
+  Handle<Object> copy;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, copy, maybe_copy);
+  return *copy;
+}
+
+
+MUST_USE_RESULT static MaybeHandle<AllocationSite> GetLiteralAllocationSite(
+    Isolate* isolate, Handle<FixedArray> literals, int literals_index,
+    Handle<FixedArray> elements) {
+  // Check if boilerplate exists. If not, create it first.
+  Handle<Object> literal_site(literals->get(literals_index), isolate);
+  Handle<AllocationSite> site;
+  if (*literal_site == isolate->heap()->undefined_value()) {
+    DCHECK(*elements != isolate->heap()->empty_fixed_array());
+    Handle<Object> boilerplate;
+    ASSIGN_RETURN_ON_EXCEPTION(
+        isolate, boilerplate,
+        Runtime::CreateArrayLiteralBoilerplate(isolate, literals, elements),
+        AllocationSite);
+
+    AllocationSiteCreationContext creation_context(isolate);
+    site = creation_context.EnterNewScope();
+    if (JSObject::DeepWalk(Handle<JSObject>::cast(boilerplate),
+                           &creation_context).is_null()) {
+      return Handle<AllocationSite>::null();
+    }
+    creation_context.ExitScope(site, Handle<JSObject>::cast(boilerplate));
+
+    literals->set(literals_index, *site);
+  } else {
+    site = Handle<AllocationSite>::cast(literal_site);
+  }
+
+  return site;
+}
+
+
+static MaybeHandle<JSObject> CreateArrayLiteralImpl(Isolate* isolate,
+                                                    Handle<FixedArray> literals,
+                                                    int literals_index,
+                                                    Handle<FixedArray> elements,
+                                                    int flags) {
+  RUNTIME_ASSERT_HANDLIFIED(
+      literals_index >= 0 && literals_index < literals->length(), JSObject);
+  Handle<AllocationSite> site;
+  ASSIGN_RETURN_ON_EXCEPTION(
+      isolate, site,
+      GetLiteralAllocationSite(isolate, literals, literals_index, elements),
+      JSObject);
+
+  bool enable_mementos = (flags & ArrayLiteral::kDisableMementos) == 0;
+  Handle<JSObject> boilerplate(JSObject::cast(site->transition_info()));
+  AllocationSiteUsageContext usage_context(isolate, site, enable_mementos);
+  usage_context.EnterNewScope();
+  JSObject::DeepCopyHints hints = (flags & ArrayLiteral::kShallowElements) == 0
+                                      ? JSObject::kNoHints
+                                      : JSObject::kObjectIsShallow;
+  MaybeHandle<JSObject> copy =
+      JSObject::DeepCopy(boilerplate, &usage_context, hints);
+  usage_context.ExitScope(site, boilerplate);
+  return copy;
+}
+
+
+RUNTIME_FUNCTION(Runtime_CreateArrayLiteral) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 4);
+  CONVERT_ARG_HANDLE_CHECKED(FixedArray, literals, 0);
+  CONVERT_SMI_ARG_CHECKED(literals_index, 1);
+  CONVERT_ARG_HANDLE_CHECKED(FixedArray, elements, 2);
+  CONVERT_SMI_ARG_CHECKED(flags, 3);
+
+  Handle<JSObject> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result, CreateArrayLiteralImpl(isolate, literals, literals_index,
+                                              elements, flags));
+  return *result;
+}
+
+
+RUNTIME_FUNCTION(Runtime_CreateArrayLiteralStubBailout) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(FixedArray, literals, 0);
+  CONVERT_SMI_ARG_CHECKED(literals_index, 1);
+  CONVERT_ARG_HANDLE_CHECKED(FixedArray, elements, 2);
+
+  Handle<JSObject> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result,
+      CreateArrayLiteralImpl(isolate, literals, literals_index, elements,
+                             ArrayLiteral::kShallowElements));
+  return *result;
+}
+
+
+RUNTIME_FUNCTION(Runtime_StoreArrayLiteralElement) {
+  HandleScope scope(isolate);
+  RUNTIME_ASSERT(args.length() == 5);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
+  CONVERT_SMI_ARG_CHECKED(store_index, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
+  CONVERT_ARG_HANDLE_CHECKED(FixedArray, literals, 3);
+  CONVERT_SMI_ARG_CHECKED(literal_index, 4);
+
+  Object* raw_literal_cell = literals->get(literal_index);
+  JSArray* boilerplate = NULL;
+  if (raw_literal_cell->IsAllocationSite()) {
+    AllocationSite* site = AllocationSite::cast(raw_literal_cell);
+    boilerplate = JSArray::cast(site->transition_info());
+  } else {
+    boilerplate = JSArray::cast(raw_literal_cell);
+  }
+  Handle<JSArray> boilerplate_object(boilerplate);
+  ElementsKind elements_kind = object->GetElementsKind();
+  DCHECK(IsFastElementsKind(elements_kind));
+  // Smis should never trigger transitions.
+  DCHECK(!value->IsSmi());
+
+  if (value->IsNumber()) {
+    DCHECK(IsFastSmiElementsKind(elements_kind));
+    ElementsKind transitioned_kind = IsFastHoleyElementsKind(elements_kind)
+                                         ? FAST_HOLEY_DOUBLE_ELEMENTS
+                                         : FAST_DOUBLE_ELEMENTS;
+    if (IsMoreGeneralElementsKindTransition(
+            boilerplate_object->GetElementsKind(), transitioned_kind)) {
+      JSObject::TransitionElementsKind(boilerplate_object, transitioned_kind);
+    }
+    JSObject::TransitionElementsKind(object, transitioned_kind);
+    DCHECK(IsFastDoubleElementsKind(object->GetElementsKind()));
+    FixedDoubleArray* double_array = FixedDoubleArray::cast(object->elements());
+    HeapNumber* number = HeapNumber::cast(*value);
+    double_array->set(store_index, number->Number());
+  } else {
+    if (!IsFastObjectElementsKind(elements_kind)) {
+      ElementsKind transitioned_kind = IsFastHoleyElementsKind(elements_kind)
+                                           ? FAST_HOLEY_ELEMENTS
+                                           : FAST_ELEMENTS;
+      JSObject::TransitionElementsKind(object, transitioned_kind);
+      ElementsKind boilerplate_elements_kind =
+          boilerplate_object->GetElementsKind();
+      if (IsMoreGeneralElementsKindTransition(boilerplate_elements_kind,
+                                              transitioned_kind)) {
+        JSObject::TransitionElementsKind(boilerplate_object, transitioned_kind);
+      }
+    }
+    FixedArray* object_array = FixedArray::cast(object->elements());
+    object_array->set(store_index, *value);
+  }
+  return *object;
+}
+}
+}  // namespace v8::internal

src/runtime/runtime-numbers.cc

@@ -561,5 +561,22 @@ RUNTIME_FUNCTION(RuntimeReference_NumberToString) {
   SealHandleScope shs(isolate);
   return __RT_impl_Runtime_NumberToStringRT(args, isolate);
 }
+
+
+RUNTIME_FUNCTION(RuntimeReference_IsSmi) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(Object, obj, 0);
+  return isolate->heap()->ToBoolean(obj->IsSmi());
+}
+
+
+RUNTIME_FUNCTION(RuntimeReference_IsNonNegativeSmi) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(Object, obj, 0);
+  return isolate->heap()->ToBoolean(obj->IsSmi() &&
+                                    Smi::cast(obj)->value() >= 0);
+}
 }
 }  // namespace v8::internal

src/runtime/runtime-observe.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#include "src/arguments.h"
+#include "src/runtime/runtime.h"
+#include "src/runtime/runtime-utils.h"
+
+namespace v8 {
+namespace internal {
+
+RUNTIME_FUNCTION(Runtime_IsObserved) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+
+  if (!args[0]->IsJSReceiver()) return isolate->heap()->false_value();
+  CONVERT_ARG_CHECKED(JSReceiver, obj, 0);
+  DCHECK(!obj->IsJSGlobalProxy() || !obj->map()->is_observed());
+  return isolate->heap()->ToBoolean(obj->map()->is_observed());
+}
+
+
+RUNTIME_FUNCTION(Runtime_SetIsObserved) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, obj, 0);
+  RUNTIME_ASSERT(!obj->IsJSGlobalProxy());
+  if (obj->IsJSProxy()) return isolate->heap()->undefined_value();
+  RUNTIME_ASSERT(!obj->map()->is_observed());
+
+  DCHECK(obj->IsJSObject());
+  JSObject::SetObserved(Handle<JSObject>::cast(obj));
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_EnqueueMicrotask) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, microtask, 0);
+  isolate->EnqueueMicrotask(microtask);
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_RunMicrotasks) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 0);
+  isolate->RunMicrotasks();
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetObservationState) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 0);
+  return isolate->heap()->observation_state();
+}
+
+
+static bool ContextsHaveSameOrigin(Handle<Context> context1,
+                                   Handle<Context> context2) {
+  return context1->security_token() == context2->security_token();
+}
+
+
+RUNTIME_FUNCTION(Runtime_ObserverObjectAndRecordHaveSameOrigin) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, observer, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, record, 2);
+
+  Handle<Context> observer_context(observer->context()->native_context());
+  Handle<Context> object_context(object->GetCreationContext());
+  Handle<Context> record_context(record->GetCreationContext());
+
+  return isolate->heap()->ToBoolean(
+      ContextsHaveSameOrigin(object_context, observer_context) &&
+      ContextsHaveSameOrigin(object_context, record_context));
+}
+
+
+RUNTIME_FUNCTION(Runtime_ObjectWasCreatedInCurrentOrigin) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
+
+  Handle<Context> creation_context(object->GetCreationContext(), isolate);
+  return isolate->heap()->ToBoolean(
+      ContextsHaveSameOrigin(creation_context, isolate->native_context()));
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetObjectContextObjectObserve) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
+
+  Handle<Context> context(object->GetCreationContext(), isolate);
+  return context->native_object_observe();
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetObjectContextObjectGetNotifier) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
+
+  Handle<Context> context(object->GetCreationContext(), isolate);
+  return context->native_object_get_notifier();
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetObjectContextNotifierPerformChange) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, object_info, 0);
+
+  Handle<Context> context(object_info->GetCreationContext(), isolate);
+  return context->native_object_notifier_perform_change();
+}
+}
+}  // namespace v8::internal

src/runtime/runtime-proxy.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#include "src/arguments.h"
+#include "src/runtime/runtime.h"
+#include "src/runtime/runtime-utils.h"
+
+namespace v8 {
+namespace internal {
+
+RUNTIME_FUNCTION(Runtime_CreateJSProxy) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, handler, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 1);
+  if (!prototype->IsJSReceiver()) prototype = isolate->factory()->null_value();
+  return *isolate->factory()->NewJSProxy(handler, prototype);
+}
+
+
+RUNTIME_FUNCTION(Runtime_CreateJSFunctionProxy) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 4);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, handler, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, call_trap, 1);
+  RUNTIME_ASSERT(call_trap->IsJSFunction() || call_trap->IsJSFunctionProxy());
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, construct_trap, 2);
+  CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 3);
+  if (!prototype->IsJSReceiver()) prototype = isolate->factory()->null_value();
+  return *isolate->factory()->NewJSFunctionProxy(handler, call_trap,
+                                                 construct_trap, prototype);
+}
+
+
+RUNTIME_FUNCTION(Runtime_IsJSProxy) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, obj, 0);
+  return isolate->heap()->ToBoolean(obj->IsJSProxy());
+}
+
+
+RUNTIME_FUNCTION(Runtime_IsJSFunctionProxy) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, obj, 0);
+  return isolate->heap()->ToBoolean(obj->IsJSFunctionProxy());
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetHandler) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSProxy, proxy, 0);
+  return proxy->handler();
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetCallTrap) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSFunctionProxy, proxy, 0);
+  return proxy->call_trap();
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetConstructTrap) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSFunctionProxy, proxy, 0);
+  return proxy->construct_trap();
+}
+
+
+RUNTIME_FUNCTION(Runtime_Fix) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSProxy, proxy, 0);
+  JSProxy::Fix(proxy);
+  return isolate->heap()->undefined_value();
+}
+}
+}  // namespace v8::internal

src/runtime/runtime-regexp.cc

@@ -1088,6 +1088,14 @@ RUNTIME_FUNCTION(RuntimeReference_RegExpExec) {
 }
 
 
+RUNTIME_FUNCTION(RuntimeReference_IsRegExp) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(Object, obj, 0);
+  return isolate->heap()->ToBoolean(obj->IsJSRegExp());
+}
+
+
 // Perform string match of pattern on subject, starting at start index.
 // Caller must ensure that 0 <= start_index <= sub->length(),
 // and should check that pat->length() + start_index <= sub->length().

src/runtime/runtime-scopes.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#include "src/accessors.h"
+#include "src/arguments.h"
+#include "src/frames-inl.h"
+#include "src/runtime/runtime.h"
+#include "src/runtime/runtime-utils.h"
+#include "src/scopeinfo.h"
+#include "src/scopes.h"
+
+namespace v8 {
+namespace internal {
+
+static Object* ThrowRedeclarationError(Isolate* isolate, Handle<String> name) {
+  HandleScope scope(isolate);
+  Handle<Object> args[1] = {name};
+  THROW_NEW_ERROR_RETURN_FAILURE(
+      isolate, NewTypeError("var_redeclaration", HandleVector(args, 1)));
+}
+
+
+// May throw a RedeclarationError.
+static Object* DeclareGlobals(Isolate* isolate, Handle<GlobalObject> global,
+                              Handle<String> name, Handle<Object> value,
+                              PropertyAttributes attr, bool is_var,
+                              bool is_const, bool is_function) {
+  // Do the lookup own properties only, see ES5 erratum.
+  LookupIterator it(global, name, LookupIterator::HIDDEN_SKIP_INTERCEPTOR);
+  Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it);
+  if (!maybe.has_value) return isolate->heap()->exception();
+
+  if (it.IsFound()) {
+    PropertyAttributes old_attributes = maybe.value;
+    // The name was declared before; check for conflicting re-declarations.
+    if (is_const) return ThrowRedeclarationError(isolate, name);
+
+    // Skip var re-declarations.
+    if (is_var) return isolate->heap()->undefined_value();
+
+    DCHECK(is_function);
+    if ((old_attributes & DONT_DELETE) != 0) {
+      // Only allow reconfiguring globals to functions in user code (no
+      // natives, which are marked as read-only).
+      DCHECK((attr & READ_ONLY) == 0);
+
+      // Check whether we can reconfigure the existing property into a
+      // function.
+      PropertyDetails old_details = it.property_details();
+      // TODO(verwaest): CALLBACKS invalidly includes ExecutableAccessInfo,
+      // which are actually data properties, not accessor properties.
+      if (old_details.IsReadOnly() || old_details.IsDontEnum() ||
+          old_details.type() == CALLBACKS) {
+        return ThrowRedeclarationError(isolate, name);
+      }
+      // If the existing property is not configurable, keep its attributes. Do
+      attr = old_attributes;
+    }
+  }
+
+  // Define or redefine own property.
+  RETURN_FAILURE_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes(
+                                           global, name, value, attr));
+
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_DeclareGlobals) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  Handle<GlobalObject> global(isolate->global_object());
+
+  CONVERT_ARG_HANDLE_CHECKED(Context, context, 0);
+  CONVERT_ARG_HANDLE_CHECKED(FixedArray, pairs, 1);
+  CONVERT_SMI_ARG_CHECKED(flags, 2);
+
+  // Traverse the name/value pairs and set the properties.
+  int length = pairs->length();
+  for (int i = 0; i < length; i += 2) {
+    HandleScope scope(isolate);
+    Handle<String> name(String::cast(pairs->get(i)));
+    Handle<Object> initial_value(pairs->get(i + 1), isolate);
+
+    // We have to declare a global const property. To capture we only
+    // assign to it when evaluating the assignment for "const x =
+    // <expr>" the initial value is the hole.
+    bool is_var = initial_value->IsUndefined();
+    bool is_const = initial_value->IsTheHole();
+    bool is_function = initial_value->IsSharedFunctionInfo();
+    DCHECK(is_var + is_const + is_function == 1);
+
+    Handle<Object> value;
+    if (is_function) {
+      // Copy the function and update its context. Use it as value.
+      Handle<SharedFunctionInfo> shared =
+          Handle<SharedFunctionInfo>::cast(initial_value);
+      Handle<JSFunction> function =
+          isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context,
+                                                                TENURED);
+      value = function;
+    } else {
+      value = isolate->factory()->undefined_value();
+    }
+
+    // Compute the property attributes. According to ECMA-262,
+    // the property must be non-configurable except in eval.
+    bool is_native = DeclareGlobalsNativeFlag::decode(flags);
+    bool is_eval = DeclareGlobalsEvalFlag::decode(flags);
+    int attr = NONE;
+    if (is_const) attr |= READ_ONLY;
+    if (is_function && is_native) attr |= READ_ONLY;
+    if (!is_const && !is_eval) attr |= DONT_DELETE;
+
+    Object* result = DeclareGlobals(isolate, global, name, value,
+                                    static_cast<PropertyAttributes>(attr),
+                                    is_var, is_const, is_function);
+    if (isolate->has_pending_exception()) return result;
+  }
+
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_InitializeVarGlobal) {
+  HandleScope scope(isolate);
+  // args[0] == name
+  // args[1] == language_mode
+  // args[2] == value (optional)
+
+  // Determine if we need to assign to the variable if it already
+  // exists (based on the number of arguments).
+  RUNTIME_ASSERT(args.length() == 3);
+
+  CONVERT_ARG_HANDLE_CHECKED(String, name, 0);
+  CONVERT_STRICT_MODE_ARG_CHECKED(strict_mode, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
+
+  Handle<GlobalObject> global(isolate->context()->global_object());
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result, Object::SetProperty(global, name, value, strict_mode));
+  return *result;
+}
+
+
+RUNTIME_FUNCTION(Runtime_InitializeConstGlobal) {
+  HandleScope handle_scope(isolate);
+  // All constants are declared with an initial value. The name
+  // of the constant is the first argument and the initial value
+  // is the second.
+  RUNTIME_ASSERT(args.length() == 2);
+  CONVERT_ARG_HANDLE_CHECKED(String, name, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
+
+  Handle<GlobalObject> global = isolate->global_object();
+
+  // Lookup the property as own on the global object.
+  LookupIterator it(global, name, LookupIterator::HIDDEN_SKIP_INTERCEPTOR);
+  Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it);
+  DCHECK(maybe.has_value);
+  PropertyAttributes old_attributes = maybe.value;
+
+  PropertyAttributes attr =
+      static_cast<PropertyAttributes>(DONT_DELETE | READ_ONLY);
+  // Set the value if the property is either missing, or the property attributes
+  // allow setting the value without invoking an accessor.
+  if (it.IsFound()) {
+    // Ignore if we can't reconfigure the value.
+    if ((old_attributes & DONT_DELETE) != 0) {
+      if ((old_attributes & READ_ONLY) != 0 ||
+          it.state() == LookupIterator::ACCESSOR) {
+        return *value;
+      }
+      attr = static_cast<PropertyAttributes>(old_attributes | READ_ONLY);
+    }
+  }
+
+  RETURN_FAILURE_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes(
+                                           global, name, value, attr));
+
+  return *value;
+}
+
+
+RUNTIME_FUNCTION(Runtime_DeclareLookupSlot) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 4);
+
+  // Declarations are always made in a function, native, or global context. In
+  // the case of eval code, the context passed is the context of the caller,
+  // which may be some nested context and not the declaration context.
+  CONVERT_ARG_HANDLE_CHECKED(Context, context_arg, 0);
+  Handle<Context> context(context_arg->declaration_context());
+  CONVERT_ARG_HANDLE_CHECKED(String, name, 1);
+  CONVERT_SMI_ARG_CHECKED(attr_arg, 2);
+  PropertyAttributes attr = static_cast<PropertyAttributes>(attr_arg);
+  RUNTIME_ASSERT(attr == READ_ONLY || attr == NONE);
+  CONVERT_ARG_HANDLE_CHECKED(Object, initial_value, 3);
+
+  // TODO(verwaest): Unify the encoding indicating "var" with DeclareGlobals.
+  bool is_var = *initial_value == NULL;
+  bool is_const = initial_value->IsTheHole();
+  bool is_function = initial_value->IsJSFunction();
+  DCHECK(is_var + is_const + is_function == 1);
+
+  int index;
+  PropertyAttributes attributes;
+  ContextLookupFlags flags = DONT_FOLLOW_CHAINS;
+  BindingFlags binding_flags;
+  Handle<Object> holder =
+      context->Lookup(name, flags, &index, &attributes, &binding_flags);
+
+  Handle<JSObject> object;
+  Handle<Object> value =
+      is_function ? initial_value
+                  : Handle<Object>::cast(isolate->factory()->undefined_value());
+
+  // TODO(verwaest): This case should probably not be covered by this function,
+  // but by DeclareGlobals instead.
+  if ((attributes != ABSENT && holder->IsJSGlobalObject()) ||
+      (context_arg->has_extension() &&
+       context_arg->extension()->IsJSGlobalObject())) {
+    return DeclareGlobals(isolate, Handle<JSGlobalObject>::cast(holder), name,
+                          value, attr, is_var, is_const, is_function);
+  }
+
+  if (attributes != ABSENT) {
+    // The name was declared before; check for conflicting re-declarations.
+    if (is_const || (attributes & READ_ONLY) != 0) {
+      return ThrowRedeclarationError(isolate, name);
+    }
+
+    // Skip var re-declarations.
+    if (is_var) return isolate->heap()->undefined_value();
+
+    DCHECK(is_function);
+    if (index >= 0) {
+      DCHECK(holder.is_identical_to(context));
+      context->set(index, *initial_value);
+      return isolate->heap()->undefined_value();
+    }
+
+    object = Handle<JSObject>::cast(holder);
+
+  } else if (context->has_extension()) {
+    object = handle(JSObject::cast(context->extension()));
+    DCHECK(object->IsJSContextExtensionObject() || object->IsJSGlobalObject());
+  } else {
+    DCHECK(context->IsFunctionContext());
+    object =
+        isolate->factory()->NewJSObject(isolate->context_extension_function());
+    context->set_extension(*object);
+  }
+
+  RETURN_FAILURE_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes(
+                                           object, name, value, attr));
+
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_InitializeLegacyConstLookupSlot) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
+  DCHECK(!value->IsTheHole());
+  // Initializations are always done in a function or native context.
+  CONVERT_ARG_HANDLE_CHECKED(Context, context_arg, 1);
+  Handle<Context> context(context_arg->declaration_context());
+  CONVERT_ARG_HANDLE_CHECKED(String, name, 2);
+
+  int index;
+  PropertyAttributes attributes;
+  ContextLookupFlags flags = DONT_FOLLOW_CHAINS;
+  BindingFlags binding_flags;
+  Handle<Object> holder =
+      context->Lookup(name, flags, &index, &attributes, &binding_flags);
+
+  if (index >= 0) {
+    DCHECK(holder->IsContext());
+    // Property was found in a context.  Perform the assignment if the constant
+    // was uninitialized.
+    Handle<Context> context = Handle<Context>::cast(holder);
+    DCHECK((attributes & READ_ONLY) != 0);
+    if (context->get(index)->IsTheHole()) context->set(index, *value);
+    return *value;
+  }
+
+  PropertyAttributes attr =
+      static_cast<PropertyAttributes>(DONT_DELETE | READ_ONLY);
+
+  // Strict mode handling not needed (legacy const is disallowed in strict
+  // mode).
+
+  // The declared const was configurable, and may have been deleted in the
+  // meanwhile. If so, re-introduce the variable in the context extension.
+  DCHECK(context_arg->has_extension());
+  if (attributes == ABSENT) {
+    holder = handle(context_arg->extension(), isolate);
+  } else {
+    // For JSContextExtensionObjects, the initializer can be run multiple times
+    // if in a for loop: for (var i = 0; i < 2; i++) { const x = i; }. Only the
+    // first assignment should go through. For JSGlobalObjects, additionally any
+    // code can run in between that modifies the declared property.
+    DCHECK(holder->IsJSGlobalObject() || holder->IsJSContextExtensionObject());
+
+    LookupIterator it(holder, name, LookupIterator::HIDDEN_SKIP_INTERCEPTOR);
+    Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it);
+    if (!maybe.has_value) return isolate->heap()->exception();
+    PropertyAttributes old_attributes = maybe.value;
+
+    // Ignore if we can't reconfigure the value.
+    if ((old_attributes & DONT_DELETE) != 0) {
+      if ((old_attributes & READ_ONLY) != 0 ||
+          it.state() == LookupIterator::ACCESSOR) {
+        return *value;
+      }
+      attr = static_cast<PropertyAttributes>(old_attributes | READ_ONLY);
+    }
+  }
+
+  RETURN_FAILURE_ON_EXCEPTION(
+      isolate, JSObject::SetOwnPropertyIgnoreAttributes(
+                   Handle<JSObject>::cast(holder), name, value, attr));
+
+  return *value;
+}
+
+
+static Handle<JSObject> NewSloppyArguments(Isolate* isolate,
+                                           Handle<JSFunction> callee,
+                                           Object** parameters,
+                                           int argument_count) {
+  Handle<JSObject> result =
+      isolate->factory()->NewArgumentsObject(callee, argument_count);
+
+  // Allocate the elements if needed.
+  int parameter_count = callee->shared()->formal_parameter_count();
+  if (argument_count > 0) {
+    if (parameter_count > 0) {
+      int mapped_count = Min(argument_count, parameter_count);
+      Handle<FixedArray> parameter_map =
+          isolate->factory()->NewFixedArray(mapped_count + 2, NOT_TENURED);
+      parameter_map->set_map(isolate->heap()->sloppy_arguments_elements_map());
+
+      Handle<Map> map = Map::Copy(handle(result->map()));
+      map->set_elements_kind(SLOPPY_ARGUMENTS_ELEMENTS);
+
+      result->set_map(*map);
+      result->set_elements(*parameter_map);
+
+      // Store the context and the arguments array at the beginning of the
+      // parameter map.
+      Handle<Context> context(isolate->context());
+      Handle<FixedArray> arguments =
+          isolate->factory()->NewFixedArray(argument_count, NOT_TENURED);
+      parameter_map->set(0, *context);
+      parameter_map->set(1, *arguments);
+
+      // Loop over the actual parameters backwards.
+      int index = argument_count - 1;
+      while (index >= mapped_count) {
+        // These go directly in the arguments array and have no
+        // corresponding slot in the parameter map.
+        arguments->set(index, *(parameters - index - 1));
+        --index;
+      }
+
+      Handle<ScopeInfo> scope_info(callee->shared()->scope_info());
+      while (index >= 0) {
+        // Detect duplicate names to the right in the parameter list.
+        Handle<String> name(scope_info->ParameterName(index));
+        int context_local_count = scope_info->ContextLocalCount();
+        bool duplicate = false;
+        for (int j = index + 1; j < parameter_count; ++j) {
+          if (scope_info->ParameterName(j) == *name) {
+            duplicate = true;
+            break;
+          }
+        }
+
+        if (duplicate) {
+          // This goes directly in the arguments array with a hole in the
+          // parameter map.
+          arguments->set(index, *(parameters - index - 1));
+          parameter_map->set_the_hole(index + 2);
+        } else {
+          // The context index goes in the parameter map with a hole in the
+          // arguments array.
+          int context_index = -1;
+          for (int j = 0; j < context_local_count; ++j) {
+            if (scope_info->ContextLocalName(j) == *name) {
+              context_index = j;
+              break;
+            }
+          }
+          DCHECK(context_index >= 0);
+          arguments->set_the_hole(index);
+          parameter_map->set(
+              index + 2,
+              Smi::FromInt(Context::MIN_CONTEXT_SLOTS + context_index));
+        }
+
+        --index;
+      }
+    } else {
+      // If there is no aliasing, the arguments object elements are not
+      // special in any way.
+      Handle<FixedArray> elements =
+          isolate->factory()->NewFixedArray(argument_count, NOT_TENURED);
+      result->set_elements(*elements);
+      for (int i = 0; i < argument_count; ++i) {
+        elements->set(i, *(parameters - i - 1));
+      }
+    }
+  }
+  return result;
+}
+
+
+static Handle<JSObject> NewStrictArguments(Isolate* isolate,
+                                           Handle<JSFunction> callee,
+                                           Object** parameters,
+                                           int argument_count) {
+  Handle<JSObject> result =
+      isolate->factory()->NewArgumentsObject(callee, argument_count);
+
+  if (argument_count > 0) {
+    Handle<FixedArray> array =
+        isolate->factory()->NewUninitializedFixedArray(argument_count);
+    DisallowHeapAllocation no_gc;
+    WriteBarrierMode mode = array->GetWriteBarrierMode(no_gc);
+    for (int i = 0; i < argument_count; i++) {
+      array->set(i, *--parameters, mode);
+    }
+    result->set_elements(*array);
+  }
+  return result;
+}
+
+
+RUNTIME_FUNCTION(Runtime_NewArguments) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0);
+  JavaScriptFrameIterator it(isolate);
+
+  // Find the frame that holds the actual arguments passed to the function.
+  it.AdvanceToArgumentsFrame();
+  JavaScriptFrame* frame = it.frame();
+
+  // Determine parameter location on the stack and dispatch on language mode.
+  int argument_count = frame->GetArgumentsLength();
+  Object** parameters = reinterpret_cast<Object**>(frame->GetParameterSlot(-1));
+  return callee->shared()->strict_mode() == STRICT
+             ? *NewStrictArguments(isolate, callee, parameters, argument_count)
+             : *NewSloppyArguments(isolate, callee, parameters, argument_count);
+}
+
+
+RUNTIME_FUNCTION(Runtime_NewSloppyArguments) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0);
+  Object** parameters = reinterpret_cast<Object**>(args[1]);
+  CONVERT_SMI_ARG_CHECKED(argument_count, 2);
+  return *NewSloppyArguments(isolate, callee, parameters, argument_count);
+}
+
+
+RUNTIME_FUNCTION(Runtime_NewStrictArguments) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0)
+  Object** parameters = reinterpret_cast<Object**>(args[1]);
+  CONVERT_SMI_ARG_CHECKED(argument_count, 2);
+  return *NewStrictArguments(isolate, callee, parameters, argument_count);
+}
+
+
+RUNTIME_FUNCTION(Runtime_NewClosureFromStubFailure) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(SharedFunctionInfo, shared, 0);
+  Handle<Context> context(isolate->context());
+  PretenureFlag pretenure_flag = NOT_TENURED;
+  return *isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context,
+                                                                pretenure_flag);
+}
+
+
+RUNTIME_FUNCTION(Runtime_NewClosure) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(Context, context, 0);
+  CONVERT_ARG_HANDLE_CHECKED(SharedFunctionInfo, shared, 1);
+  CONVERT_BOOLEAN_ARG_CHECKED(pretenure, 2);
+
+  // The caller ensures that we pretenure closures that are assigned
+  // directly to properties.
+  PretenureFlag pretenure_flag = pretenure ? TENURED : NOT_TENURED;
+  return *isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context,
+                                                                pretenure_flag);
+}
+
+
+RUNTIME_FUNCTION(Runtime_NewGlobalContext) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
+  CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 1);
+  Handle<Context> result =
+      isolate->factory()->NewGlobalContext(function, scope_info);
+
+  DCHECK(function->context() == isolate->context());
+  DCHECK(function->context()->global_object() == result->global_object());
+  result->global_object()->set_global_context(*result);
+  return *result;
+}
+
+
+RUNTIME_FUNCTION(Runtime_NewFunctionContext) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
+
+  DCHECK(function->context() == isolate->context());
+  int length = function->shared()->scope_info()->ContextLength();
+  return *isolate->factory()->NewFunctionContext(length, function);
+}
+
+
+RUNTIME_FUNCTION(Runtime_PushWithContext) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+  Handle<JSReceiver> extension_object;
+  if (args[0]->IsJSReceiver()) {
+    extension_object = args.at<JSReceiver>(0);
+  } else {
+    // Try to convert the object to a proper JavaScript object.
+    MaybeHandle<JSReceiver> maybe_object =
+        Object::ToObject(isolate, args.at<Object>(0));
+    if (!maybe_object.ToHandle(&extension_object)) {
+      Handle<Object> handle = args.at<Object>(0);
+      THROW_NEW_ERROR_RETURN_FAILURE(
+          isolate, NewTypeError("with_expression", HandleVector(&handle, 1)));
+    }
+  }
+
+  Handle<JSFunction> function;
+  if (args[1]->IsSmi()) {
+    // A smi sentinel indicates a context nested inside global code rather
+    // than some function.  There is a canonical empty function that can be
+    // gotten from the native context.
+    function = handle(isolate->native_context()->closure());
+  } else {
+    function = args.at<JSFunction>(1);
+  }
+
+  Handle<Context> current(isolate->context());
+  Handle<Context> context =
+      isolate->factory()->NewWithContext(function, current, extension_object);
+  isolate->set_context(*context);
+  return *context;
+}
+
+
+RUNTIME_FUNCTION(Runtime_PushCatchContext) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(String, name, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, thrown_object, 1);
+  Handle<JSFunction> function;
+  if (args[2]->IsSmi()) {
+    // A smi sentinel indicates a context nested inside global code rather
+    // than some function.  There is a canonical empty function that can be
+    // gotten from the native context.
+    function = handle(isolate->native_context()->closure());
+  } else {
+    function = args.at<JSFunction>(2);
+  }
+  Handle<Context> current(isolate->context());
+  Handle<Context> context = isolate->factory()->NewCatchContext(
+      function, current, name, thrown_object);
+  isolate->set_context(*context);
+  return *context;
+}
+
+
+RUNTIME_FUNCTION(Runtime_PushBlockContext) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+  CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 0);
+  Handle<JSFunction> function;
+  if (args[1]->IsSmi()) {
+    // A smi sentinel indicates a context nested inside global code rather
+    // than some function.  There is a canonical empty function that can be
+    // gotten from the native context.
+    function = handle(isolate->native_context()->closure());
+  } else {
+    function = args.at<JSFunction>(1);
+  }
+  Handle<Context> current(isolate->context());
+  Handle<Context> context =
+      isolate->factory()->NewBlockContext(function, current, scope_info);
+  isolate->set_context(*context);
+  return *context;
+}
+
+
+RUNTIME_FUNCTION(Runtime_IsJSModule) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(Object, obj, 0);
+  return isolate->heap()->ToBoolean(obj->IsJSModule());
+}
+
+
+RUNTIME_FUNCTION(Runtime_PushModuleContext) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 2);
+  CONVERT_SMI_ARG_CHECKED(index, 0);
+
+  if (!args[1]->IsScopeInfo()) {
+    // Module already initialized. Find hosting context and retrieve context.
+    Context* host = Context::cast(isolate->context())->global_context();
+    Context* context = Context::cast(host->get(index));
+    DCHECK(context->previous() == isolate->context());
+    isolate->set_context(context);
+    return context;
+  }
+
+  CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 1);
+
+  // Allocate module context.
+  HandleScope scope(isolate);
+  Factory* factory = isolate->factory();
+  Handle<Context> context = factory->NewModuleContext(scope_info);
+  Handle<JSModule> module = factory->NewJSModule(context, scope_info);
+  context->set_module(*module);
+  Context* previous = isolate->context();
+  context->set_previous(previous);
+  context->set_closure(previous->closure());
+  context->set_global_object(previous->global_object());
+  isolate->set_context(*context);
+
+  // Find hosting scope and initialize internal variable holding module there.
+  previous->global_context()->set(index, *context);
+
+  return *context;
+}
+
+
+RUNTIME_FUNCTION(Runtime_DeclareModules) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(FixedArray, descriptions, 0);
+  Context* host_context = isolate->context();
+
+  for (int i = 0; i < descriptions->length(); ++i) {
+    Handle<ModuleInfo> description(ModuleInfo::cast(descriptions->get(i)));
+    int host_index = description->host_index();
+    Handle<Context> context(Context::cast(host_context->get(host_index)));
+    Handle<JSModule> module(context->module());
+
+    for (int j = 0; j < description->length(); ++j) {
+      Handle<String> name(description->name(j));
+      VariableMode mode = description->mode(j);
+      int index = description->index(j);
+      switch (mode) {
+        case VAR:
+        case LET:
+        case CONST:
+        case CONST_LEGACY: {
+          PropertyAttributes attr =
+              IsImmutableVariableMode(mode) ? FROZEN : SEALED;
+          Handle<AccessorInfo> info =
+              Accessors::MakeModuleExport(name, index, attr);
+          Handle<Object> result =
+              JSObject::SetAccessor(module, info).ToHandleChecked();
+          DCHECK(!result->IsUndefined());
+          USE(result);
+          break;
+        }
+        case MODULE: {
+          Object* referenced_context = Context::cast(host_context)->get(index);
+          Handle<JSModule> value(Context::cast(referenced_context)->module());
+          JSObject::SetOwnPropertyIgnoreAttributes(module, name, value, FROZEN)
+              .Assert();
+          break;
+        }
+        case INTERNAL:
+        case TEMPORARY:
+        case DYNAMIC:
+        case DYNAMIC_GLOBAL:
+        case DYNAMIC_LOCAL:
+          UNREACHABLE();
+      }
+    }
+
+    JSObject::PreventExtensions(module).Assert();
+  }
+
+  DCHECK(!isolate->has_pending_exception());
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_DeleteLookupSlot) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+
+  CONVERT_ARG_HANDLE_CHECKED(Context, context, 0);
+  CONVERT_ARG_HANDLE_CHECKED(String, name, 1);
+
+  int index;
+  PropertyAttributes attributes;
+  ContextLookupFlags flags = FOLLOW_CHAINS;
+  BindingFlags binding_flags;
+  Handle<Object> holder =
+      context->Lookup(name, flags, &index, &attributes, &binding_flags);
+
+  // If the slot was not found the result is true.
+  if (holder.is_null()) {
+    return isolate->heap()->true_value();
+  }
+
+  // If the slot was found in a context, it should be DONT_DELETE.
+  if (holder->IsContext()) {
+    return isolate->heap()->false_value();
+  }
+
+  // The slot was found in a JSObject, either a context extension object,
+  // the global object, or the subject of a with.  Try to delete it
+  // (respecting DONT_DELETE).
+  Handle<JSObject> object = Handle<JSObject>::cast(holder);
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
+                                     JSReceiver::DeleteProperty(object, name));
+  return *result;
+}
+
+
+static Object* ComputeReceiverForNonGlobal(Isolate* isolate, JSObject* holder) {
+  DCHECK(!holder->IsGlobalObject());
+  Context* top = isolate->context();
+  // Get the context extension function.
+  JSFunction* context_extension_function =
+      top->native_context()->context_extension_function();
+  // If the holder isn't a context extension object, we just return it
+  // as the receiver. This allows arguments objects to be used as
+  // receivers, but only if they are put in the context scope chain
+  // explicitly via a with-statement.
+  Object* constructor = holder->map()->constructor();
+  if (constructor != context_extension_function) return holder;
+  // Fall back to using the global object as the implicit receiver if
+  // the property turns out to be a local variable allocated in a
+  // context extension object - introduced via eval.
+  return isolate->heap()->undefined_value();
+}
+
+
+static ObjectPair LoadLookupSlotHelper(Arguments args, Isolate* isolate,
+                                       bool throw_error) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(2, args.length());
+
+  if (!args[0]->IsContext() || !args[1]->IsString()) {
+    return MakePair(isolate->ThrowIllegalOperation(), NULL);
+  }
+  Handle<Context> context = args.at<Context>(0);
+  Handle<String> name = args.at<String>(1);
+
+  int index;
+  PropertyAttributes attributes;
+  ContextLookupFlags flags = FOLLOW_CHAINS;
+  BindingFlags binding_flags;
+  Handle<Object> holder =
+      context->Lookup(name, flags, &index, &attributes, &binding_flags);
+  if (isolate->has_pending_exception()) {
+    return MakePair(isolate->heap()->exception(), NULL);
+  }
+
+  // If the index is non-negative, the slot has been found in a context.
+  if (index >= 0) {
+    DCHECK(holder->IsContext());
+    // If the "property" we were looking for is a local variable, the
+    // receiver is the global object; see ECMA-262, 3rd., 10.1.6 and 10.2.3.
+    Handle<Object> receiver = isolate->factory()->undefined_value();
+    Object* value = Context::cast(*holder)->get(index);
+    // Check for uninitialized bindings.
+    switch (binding_flags) {
+      case MUTABLE_CHECK_INITIALIZED:
+      case IMMUTABLE_CHECK_INITIALIZED_HARMONY:
+        if (value->IsTheHole()) {
+          Handle<Object> error;
+          MaybeHandle<Object> maybe_error =
+              isolate->factory()->NewReferenceError("not_defined",
+                                                    HandleVector(&name, 1));
+          if (maybe_error.ToHandle(&error)) isolate->Throw(*error);
+          return MakePair(isolate->heap()->exception(), NULL);
+        }
+      // FALLTHROUGH
+      case MUTABLE_IS_INITIALIZED:
+      case IMMUTABLE_IS_INITIALIZED:
+      case IMMUTABLE_IS_INITIALIZED_HARMONY:
+        DCHECK(!value->IsTheHole());
+        return MakePair(value, *receiver);
+      case IMMUTABLE_CHECK_INITIALIZED:
+        if (value->IsTheHole()) {
+          DCHECK((attributes & READ_ONLY) != 0);
+          value = isolate->heap()->undefined_value();
+        }
+        return MakePair(value, *receiver);
+      case MISSING_BINDING:
+        UNREACHABLE();
+        return MakePair(NULL, NULL);
+    }
+  }
+
+  // Otherwise, if the slot was found the holder is a context extension
+  // object, subject of a with, or a global object.  We read the named
+  // property from it.
+  if (!holder.is_null()) {
+    Handle<JSReceiver> object = Handle<JSReceiver>::cast(holder);
+#ifdef DEBUG
+    if (!object->IsJSProxy()) {
+      Maybe<bool> maybe = JSReceiver::HasProperty(object, name);
+      DCHECK(maybe.has_value);
+      DCHECK(maybe.value);
+    }
+#endif
+    // GetProperty below can cause GC.
+    Handle<Object> receiver_handle(
+        object->IsGlobalObject()
+            ? Object::cast(isolate->heap()->undefined_value())
+            : object->IsJSProxy() ? static_cast<Object*>(*object)
+                                  : ComputeReceiverForNonGlobal(
+                                        isolate, JSObject::cast(*object)),
+        isolate);
+
+    // No need to unhole the value here.  This is taken care of by the
+    // GetProperty function.
+    Handle<Object> value;
+    ASSIGN_RETURN_ON_EXCEPTION_VALUE(
+        isolate, value, Object::GetProperty(object, name),
+        MakePair(isolate->heap()->exception(), NULL));
+    return MakePair(*value, *receiver_handle);
+  }
+
+  if (throw_error) {
+    // The property doesn't exist - throw exception.
+    Handle<Object> error;
+    MaybeHandle<Object> maybe_error = isolate->factory()->NewReferenceError(
+        "not_defined", HandleVector(&name, 1));
+    if (maybe_error.ToHandle(&error)) isolate->Throw(*error);
+    return MakePair(isolate->heap()->exception(), NULL);
+  } else {
+    // The property doesn't exist - return undefined.
+    return MakePair(isolate->heap()->undefined_value(),
+                    isolate->heap()->undefined_value());
+  }
+}
+
+
+RUNTIME_FUNCTION_RETURN_PAIR(Runtime_LoadLookupSlot) {
+  return LoadLookupSlotHelper(args, isolate, true);
+}
+
+
+RUNTIME_FUNCTION_RETURN_PAIR(Runtime_LoadLookupSlotNoReferenceError) {
+  return LoadLookupSlotHelper(args, isolate, false);
+}
+
+
+RUNTIME_FUNCTION(Runtime_StoreLookupSlot) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 4);
+
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Context, context, 1);
+  CONVERT_ARG_HANDLE_CHECKED(String, name, 2);
+  CONVERT_STRICT_MODE_ARG_CHECKED(strict_mode, 3);
+
+  int index;
+  PropertyAttributes attributes;
+  ContextLookupFlags flags = FOLLOW_CHAINS;
+  BindingFlags binding_flags;
+  Handle<Object> holder =
+      context->Lookup(name, flags, &index, &attributes, &binding_flags);
+  // In case of JSProxy, an exception might have been thrown.
+  if (isolate->has_pending_exception()) return isolate->heap()->exception();
+
+  // The property was found in a context slot.
+  if (index >= 0) {
+    if ((attributes & READ_ONLY) == 0) {
+      Handle<Context>::cast(holder)->set(index, *value);
+    } else if (strict_mode == STRICT) {
+      // Setting read only property in strict mode.
+      THROW_NEW_ERROR_RETURN_FAILURE(
+          isolate,
+          NewTypeError("strict_cannot_assign", HandleVector(&name, 1)));
+    }
+    return *value;
+  }
+
+  // Slow case: The property is not in a context slot.  It is either in a
+  // context extension object, a property of the subject of a with, or a
+  // property of the global object.
+  Handle<JSReceiver> object;
+  if (attributes != ABSENT) {
+    // The property exists on the holder.
+    object = Handle<JSReceiver>::cast(holder);
+  } else if (strict_mode == STRICT) {
+    // If absent in strict mode: throw.
+    THROW_NEW_ERROR_RETURN_FAILURE(
+        isolate, NewReferenceError("not_defined", HandleVector(&name, 1)));
+  } else {
+    // If absent in sloppy mode: add the property to the global object.
+    object = Handle<JSReceiver>(context->global_object());
+  }
+
+  RETURN_FAILURE_ON_EXCEPTION(
+      isolate, Object::SetProperty(object, name, value, strict_mode));
+
+  return *value;
+}
+
+
+RUNTIME_FUNCTION(Runtime_GetArgumentsProperty) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, raw_key, 0);
+
+  // Compute the frame holding the arguments.
+  JavaScriptFrameIterator it(isolate);
+  it.AdvanceToArgumentsFrame();
+  JavaScriptFrame* frame = it.frame();
+
+  // Get the actual number of provided arguments.
+  const uint32_t n = frame->ComputeParametersCount();
+
+  // Try to convert the key to an index. If successful and within
+  // index return the the argument from the frame.
+  uint32_t index;
+  if (raw_key->ToArrayIndex(&index) && index < n) {
+    return frame->GetParameter(index);
+  }
+
+  HandleScope scope(isolate);
+  if (raw_key->IsSymbol()) {
+    Handle<Symbol> symbol = Handle<Symbol>::cast(raw_key);
+    if (symbol->Equals(isolate->native_context()->iterator_symbol())) {
+      return isolate->native_context()->array_values_iterator();
+    }
+    // Lookup in the initial Object.prototype object.
+    Handle<Object> result;
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+        isolate, result,
+        Object::GetProperty(isolate->initial_object_prototype(),
+                            Handle<Symbol>::cast(raw_key)));
+    return *result;
+  }
+
+  // Convert the key to a string.
+  Handle<Object> converted;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, converted,
+                                     Execution::ToString(isolate, raw_key));
+  Handle<String> key = Handle<String>::cast(converted);
+
+  // Try to convert the string key into an array index.
+  if (key->AsArrayIndex(&index)) {
+    if (index < n) {
+      return frame->GetParameter(index);
+    } else {
+      Handle<Object> initial_prototype(isolate->initial_object_prototype());
+      Handle<Object> result;
+      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+          isolate, result,
+          Object::GetElement(isolate, initial_prototype, index));
+      return *result;
+    }
+  }
+
+  // Handle special arguments properties.
+  if (String::Equals(isolate->factory()->length_string(), key)) {
+    return Smi::FromInt(n);
+  }
+  if (String::Equals(isolate->factory()->callee_string(), key)) {
+    JSFunction* function = frame->function();
+    if (function->shared()->strict_mode() == STRICT) {
+      THROW_NEW_ERROR_RETURN_FAILURE(
+          isolate, NewTypeError("strict_arguments_callee",
+                                HandleVector<Object>(NULL, 0)));
+    }
+    return function;
+  }
+
+  // Lookup in the initial Object.prototype object.
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result,
+      Object::GetProperty(isolate->initial_object_prototype(), key));
+  return *result;
+}
+
+
+RUNTIME_FUNCTION(RuntimeReference_ArgumentsLength) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 0);
+  JavaScriptFrameIterator it(isolate);
+  JavaScriptFrame* frame = it.frame();
+  return Smi::FromInt(frame->GetArgumentsLength());
+}
+
+
+RUNTIME_FUNCTION(RuntimeReference_Arguments) {
+  SealHandleScope shs(isolate);
+  return __RT_impl_Runtime_GetArgumentsProperty(args, isolate);
+}
+}
+}  // namespace v8::internal

src/runtime/runtime-symbol.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#include "src/arguments.h"
+#include "src/runtime/runtime.h"
+#include "src/runtime/runtime-utils.h"
+
+namespace v8 {
+namespace internal {
+
+RUNTIME_FUNCTION(Runtime_CreateSymbol) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, name, 0);
+  RUNTIME_ASSERT(name->IsString() || name->IsUndefined());
+  Handle<Symbol> symbol = isolate->factory()->NewSymbol();
+  if (name->IsString()) symbol->set_name(*name);
+  return *symbol;
+}
+
+
+RUNTIME_FUNCTION(Runtime_CreatePrivateSymbol) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, name, 0);
+  RUNTIME_ASSERT(name->IsString() || name->IsUndefined());
+  Handle<Symbol> symbol = isolate->factory()->NewPrivateSymbol();
+  if (name->IsString()) symbol->set_name(*name);
+  return *symbol;
+}
+
+
+RUNTIME_FUNCTION(Runtime_CreatePrivateOwnSymbol) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, name, 0);
+  RUNTIME_ASSERT(name->IsString() || name->IsUndefined());
+  Handle<Symbol> symbol = isolate->factory()->NewPrivateOwnSymbol();
+  if (name->IsString()) symbol->set_name(*name);
+  return *symbol;
+}
+
+
+RUNTIME_FUNCTION(Runtime_CreateGlobalPrivateOwnSymbol) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(String, name, 0);
+  Handle<JSObject> registry = isolate->GetSymbolRegistry();
+  Handle<String> part = isolate->factory()->private_intern_string();
+  Handle<Object> privates;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, privates, Object::GetPropertyOrElement(registry, part));
+  Handle<Object> symbol;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, symbol, Object::GetPropertyOrElement(privates, name));
+  if (!symbol->IsSymbol()) {
+    DCHECK(symbol->IsUndefined());
+    symbol = isolate->factory()->NewPrivateSymbol();
+    Handle<Symbol>::cast(symbol)->set_name(*name);
+    Handle<Symbol>::cast(symbol)->set_is_own(true);
+    JSObject::SetProperty(Handle<JSObject>::cast(privates), name, symbol,
+                          STRICT).Assert();
+  }
+  return *symbol;
+}
+
+
+RUNTIME_FUNCTION(Runtime_NewSymbolWrapper) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Symbol, symbol, 0);
+  return *Object::ToObject(isolate, symbol).ToHandleChecked();
+}
+
+
+RUNTIME_FUNCTION(Runtime_SymbolDescription) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(Symbol, symbol, 0);
+  return symbol->name();
+}
+
+
+RUNTIME_FUNCTION(Runtime_SymbolRegistry) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 0);
+  return *isolate->GetSymbolRegistry();
+}
+
+
+RUNTIME_FUNCTION(Runtime_SymbolIsPrivate) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(Symbol, symbol, 0);
+  return isolate->heap()->ToBoolean(symbol->is_private());
+}
+}
+}  // namespace v8::internal

src/runtime/runtime-test.cc

@@ -303,6 +303,53 @@ RUNTIME_FUNCTION(Runtime_GetV8Version) {
 }
 
 
+static int StackSize(Isolate* isolate) {
+  int n = 0;
+  for (JavaScriptFrameIterator it(isolate); !it.done(); it.Advance()) n++;
+  return n;
+}
+
+
+static void PrintTransition(Isolate* isolate, Object* result) {
+  // indentation
+  {
+    const int nmax = 80;
+    int n = StackSize(isolate);
+    if (n <= nmax)
+      PrintF("%4d:%*s", n, n, "");
+    else
+      PrintF("%4d:%*s", n, nmax, "...");
+  }
+
+  if (result == NULL) {
+    JavaScriptFrame::PrintTop(isolate, stdout, true, false);
+    PrintF(" {\n");
+  } else {
+    // function result
+    PrintF("} -> ");
+    result->ShortPrint();
+    PrintF("\n");
+  }
+}
+
+
+RUNTIME_FUNCTION(Runtime_TraceEnter) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 0);
+  PrintTransition(isolate, NULL);
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_TraceExit) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_CHECKED(Object, obj, 0);
+  PrintTransition(isolate, obj);
+  return obj;  // return TOS
+}
+
+
 #ifdef DEBUG
 // ListNatives is ONLY used by the fuzz-natives.js in debug mode
 // Exclude the code in release mode.

tools/gyp/v8.gyp

@@ -741,14 +741,20 @@
         '../../src/runtime/runtime-compiler.cc',
         '../../src/runtime/runtime-date.cc',
         '../../src/runtime/runtime-debug.cc',
+        '../../src/runtime/runtime-function.cc',
         '../../src/runtime/runtime-generator.cc',
         '../../src/runtime/runtime-i18n.cc',
         '../../src/runtime/runtime-json.cc',
+        '../../src/runtime/runtime-literals.cc',
         '../../src/runtime/runtime-liveedit.cc',
         '../../src/runtime/runtime-maths.cc',
         '../../src/runtime/runtime-numbers.cc',
+        '../../src/runtime/runtime-observe.cc',
+        '../../src/runtime/runtime-proxy.cc',
         '../../src/runtime/runtime-regexp.cc',
+        '../../src/runtime/runtime-scopes.cc',
         '../../src/runtime/runtime-strings.cc',
+        '../../src/runtime/runtime-symbol.cc',
         '../../src/runtime/runtime-test.cc',
         '../../src/runtime/runtime-typedarray.cc',
         '../../src/runtime/runtime-uri.cc',