blob: 08e68ee996e3521e83b2470d4d2972c07acea103 [file] [log] [blame]
// Copyright 2015 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/runtime/runtime-utils.h"
#include "src/execution/arguments-inl.h"
#include "src/execution/isolate-inl.h"
#include "src/heap/factory.h"
#include "src/heap/heap-inl.h" // For ToBoolean. TODO(jkummerow): Drop.
#include "src/logging/counters.h"
#include "src/objects/elements.h"
#include "src/objects/keys.h"
#include "src/objects/module.h"
#include "src/objects/objects-inl.h"
namespace v8 {
namespace internal {
namespace {
// Returns either a FixedArray or, if the given {receiver} has an enum cache
// that contains all enumerable properties of the {receiver} and its prototypes
// have none, the map of the {receiver}. This is used to speed up the check for
// deletions during a for-in.
MaybeHandle<HeapObject> Enumerate(Isolate* isolate,
Handle<JSReceiver> receiver) {
JSObject::MakePrototypesFast(receiver, kStartAtReceiver, isolate);
FastKeyAccumulator accumulator(isolate, receiver,
// Test if we have an enum cache for {receiver}.
if (!accumulator.is_receiver_simple_enum()) {
Handle<FixedArray> keys;
isolate, keys,
? GetKeysConversion::kConvertToString
: GetKeysConversion::kNoNumbers),
// Test again, since cache may have been built by GetKeys() calls above.
if (!accumulator.is_receiver_simple_enum()) return keys;
return handle(receiver->map(), isolate);
// This is a slight modification of JSReceiver::HasProperty, dealing with
// the oddities of JSProxy and JSModuleNamespace in for-in filter.
MaybeHandle<Object> HasEnumerableProperty(Isolate* isolate,
Handle<JSReceiver> receiver,
Handle<Object> key) {
bool success = false;
Maybe<PropertyAttributes> result = Just(ABSENT);
LookupIterator::Key lookup_key(isolate, key, &success);
if (!success) return isolate->factory()->undefined_value();
LookupIterator it(isolate, receiver, lookup_key);
for (; it.IsFound(); it.Next()) {
switch (it.state()) {
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
case LookupIterator::JSPROXY: {
// For proxies we have to invoke the [[GetOwnProperty]] trap.
result = JSProxy::GetPropertyAttributes(&it);
if (result.IsNothing()) return MaybeHandle<Object>();
if (result.FromJust() == ABSENT) {
// Continue lookup on the proxy's prototype.
Handle<JSProxy> proxy = it.GetHolder<JSProxy>();
Handle<Object> prototype;
ASSIGN_RETURN_ON_EXCEPTION(isolate, prototype,
JSProxy::GetPrototype(proxy), Object);
if (prototype->IsNull(isolate)) {
return isolate->factory()->undefined_value();
// We already have a stack-check in JSProxy::GetPrototype.
return HasEnumerableProperty(
isolate, Handle<JSReceiver>::cast(prototype), key);
} else if (result.FromJust() & DONT_ENUM) {
return isolate->factory()->undefined_value();
} else {
return it.GetName();
case LookupIterator::INTERCEPTOR: {
result = JSObject::GetPropertyAttributesWithInterceptor(&it);
if (result.IsNothing()) return MaybeHandle<Object>();
if (result.FromJust() != ABSENT) return it.GetName();
case LookupIterator::ACCESS_CHECK: {
if (it.HasAccess()) continue;
result = JSObject::GetPropertyAttributesWithFailedAccessCheck(&it);
if (result.IsNothing()) return MaybeHandle<Object>();
if (result.FromJust() != ABSENT) return it.GetName();
return isolate->factory()->undefined_value();
case LookupIterator::INTEGER_INDEXED_EXOTIC:
// TypedArray out-of-bounds access.
return isolate->factory()->undefined_value();
case LookupIterator::ACCESSOR: {
if (it.GetHolder<Object>()->IsJSModuleNamespace()) {
result = JSModuleNamespace::GetPropertyAttributes(&it);
if (result.IsNothing()) return MaybeHandle<Object>();
DCHECK_EQ(0, result.FromJust() & DONT_ENUM);
return it.GetName();
case LookupIterator::DATA:
return it.GetName();
return isolate->factory()->undefined_value();
} // namespace
RUNTIME_FUNCTION(Runtime_ForInEnumerate) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
RETURN_RESULT_OR_FAILURE(isolate, Enumerate(isolate, receiver));
RUNTIME_FUNCTION(Runtime_ForInHasProperty) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
Handle<Object> result;
isolate, result, HasEnumerableProperty(isolate, receiver, key));
return isolate->heap()->ToBoolean(!result->IsUndefined(isolate));
} // namespace internal
} // namespace v8