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runtime-forin.cc
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136 lines (125 loc) · 5.39 KB
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// 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/execution/isolate-inl.h"
#include "src/heap/factory.h"
#include "src/heap/heap-inl.h" // For ToBoolean. TODO(jkummerow): Drop.
#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.
MaybeDirectHandle<HeapObject> Enumerate(Isolate* isolate,
DirectHandle<JSReceiver> receiver) {
JSObject::MakePrototypesFast(receiver, kStartAtReceiver, isolate);
FastKeyAccumulator accumulator(isolate, receiver,
KeyCollectionMode::kIncludePrototypes,
ENUMERABLE_STRINGS, true);
// Test if we have an enum cache for {receiver}.
if (!accumulator.is_receiver_simple_enum()) {
DirectHandle<FixedArray> keys;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, keys,
accumulator.GetKeys(accumulator.may_have_elements()
? GetKeysConversion::kConvertToString
: GetKeysConversion::kNoNumbers));
// Test again, since cache may have been built by GetKeys() calls above.
if (!accumulator.is_receiver_simple_enum()) return keys;
}
DCHECK(!IsJSModuleNamespace(*receiver));
return direct_handle(receiver->map(), isolate);
}
// This is a slight modification of JSReceiver::HasProperty, dealing with
// the oddities of JSProxy and JSModuleNamespace in for-in filter.
MaybeDirectHandle<Object> HasEnumerableProperty(
Isolate* isolate, DirectHandle<JSReceiver> receiver,
DirectHandle<Object> key) {
bool success = false;
Maybe<PropertyAttributes> result = Just(ABSENT);
PropertyKey lookup_key(isolate, key, &success);
if (!success) return isolate->factory()->undefined_value();
LookupIterator it(isolate, receiver, lookup_key);
for (;; it.Next()) {
switch (it.state()) {
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::JSPROXY: {
// For proxies we have to invoke the [[GetOwnProperty]] trap.
result = JSProxy::GetPropertyAttributes(&it);
if (result.IsNothing()) return MaybeDirectHandle<Object>();
if (result.FromJust() == ABSENT) {
// Continue lookup on the proxy's prototype.
DirectHandle<JSProxy> proxy = it.GetHolder<JSProxy>();
DirectHandle<Object> prototype;
ASSIGN_RETURN_ON_EXCEPTION(isolate, prototype,
JSProxy::GetPrototype(proxy));
if (IsNull(*prototype, isolate)) {
return isolate->factory()->undefined_value();
}
// We already have a stack-check in JSProxy::GetPrototype.
return HasEnumerableProperty(isolate, Cast<JSReceiver>(prototype),
key);
} else if (result.FromJust() & DONT_ENUM) {
return isolate->factory()->undefined_value();
} else {
return it.GetName();
}
}
case LookupIterator::WASM_OBJECT:
continue; // Continue to the prototype, if present.
case LookupIterator::INTERCEPTOR: {
result = JSObject::GetPropertyAttributesWithInterceptor(&it);
if (result.IsNothing()) return MaybeDirectHandle<Object>();
if (result.FromJust() != ABSENT) return it.GetName();
continue;
}
case LookupIterator::ACCESS_CHECK: {
if (it.HasAccess()) continue;
result = JSObject::GetPropertyAttributesWithFailedAccessCheck(&it);
if (result.IsNothing()) return MaybeDirectHandle<Object>();
if (result.FromJust() != ABSENT) return it.GetName();
return isolate->factory()->undefined_value();
}
case LookupIterator::TYPED_ARRAY_INDEX_NOT_FOUND:
// TypedArray out-of-bounds access.
return isolate->factory()->undefined_value();
case LookupIterator::ACCESSOR: {
if (IsJSModuleNamespace(*it.GetHolder<Object>())) {
result = JSModuleNamespace::GetPropertyAttributes(&it);
if (result.IsNothing()) return MaybeDirectHandle<Object>();
DCHECK_EQ(0, result.FromJust() & DONT_ENUM);
}
return it.GetName();
}
case LookupIterator::DATA:
return it.GetName();
case LookupIterator::NOT_FOUND:
return isolate->factory()->undefined_value();
}
UNREACHABLE();
}
}
} // namespace
RUNTIME_FUNCTION(Runtime_ForInEnumerate) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
DirectHandle<JSReceiver> receiver = args.at<JSReceiver>(0);
RETURN_RESULT_OR_FAILURE(isolate, Enumerate(isolate, receiver));
}
RUNTIME_FUNCTION(Runtime_ForInHasProperty) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
DirectHandle<JSReceiver> receiver = args.at<JSReceiver>(0);
DirectHandle<Object> key = args.at(1);
DirectHandle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result, HasEnumerableProperty(isolate, receiver, key));
return isolate->heap()->ToBoolean(!IsUndefined(*result, isolate));
}
} // namespace internal
} // namespace v8