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ArrayPrototypeInlines.h
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251 lines (220 loc) · 10.2 KB
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/*
* Copyright (C) 2022 Apple, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "ArrayConstructor.h"
#include "ArrayPrototype.h"
#include "Error.h"
#include "ExceptionHelpers.h"
#include "GetVM.h"
#include "JSGlobalObject.h"
namespace JSC {
enum class SpeciesConstructResult : uint8_t {
FastPath,
Exception,
CreatedObject
};
ALWAYS_INLINE bool arraySpeciesWatchpointIsValid(JSObject* thisObject)
{
JSGlobalObject* globalObject = thisObject->globalObject();
ArrayPrototype* arrayPrototype = globalObject->arrayPrototype();
ASSERT(globalObject->arraySpeciesWatchpointSet().state() != ClearWatchpoint);
return !thisObject->hasCustomProperties()
&& arrayPrototype == thisObject->getPrototypeDirect()
&& globalObject->arraySpeciesWatchpointSet().state() == IsWatched;
}
ALWAYS_INLINE std::pair<SpeciesConstructResult, JSObject*> speciesConstructArray(JSGlobalObject* globalObject, JSObject* thisObject, uint64_t length)
{
VM& vm = getVM(globalObject);
auto scope = DECLARE_THROW_SCOPE(vm);
constexpr std::pair<SpeciesConstructResult, JSObject*> exceptionResult { SpeciesConstructResult::Exception, nullptr };
// ECMA 9.4.2.3: https://tc39.github.io/ecma262/#sec-arrayspeciescreate
JSValue constructor = jsUndefined();
bool thisIsArray = isArray(globalObject, thisObject);
RETURN_IF_EXCEPTION(scope, exceptionResult);
if (LIKELY(thisIsArray)) {
// Fast path in the normal case where the user has not set an own constructor and the Array.prototype.constructor is normal.
// We need prototype check for subclasses of Array, which are Array objects but have a different prototype by default.
bool isValid = arraySpeciesWatchpointIsValid(thisObject);
RETURN_IF_EXCEPTION(scope, exceptionResult);
if (LIKELY(isValid))
return std::pair { SpeciesConstructResult::FastPath, nullptr };
constructor = thisObject->get(globalObject, vm.propertyNames->constructor);
RETURN_IF_EXCEPTION(scope, exceptionResult);
if (constructor.isConstructor()) {
JSObject* constructorObject = jsCast<JSObject*>(constructor);
bool isArrayConstructorFromAnotherRealm = globalObject != constructorObject->globalObject()
&& constructorObject->inherits<ArrayConstructor>();
if (isArrayConstructorFromAnotherRealm)
return std::pair { SpeciesConstructResult::FastPath, nullptr };
}
if (constructor.isObject()) {
constructor = constructor.get(globalObject, vm.propertyNames->speciesSymbol);
RETURN_IF_EXCEPTION(scope, exceptionResult);
if (constructor.isNull())
return std::pair { SpeciesConstructResult::FastPath, nullptr };
}
} else {
// If isArray is false, return ? ArrayCreate(length).
return std::pair { SpeciesConstructResult::FastPath, nullptr };
}
if (constructor.isUndefined())
return std::pair { SpeciesConstructResult::FastPath, nullptr };
MarkedArgumentBuffer args;
args.append(jsNumber(length));
ASSERT(!args.hasOverflowed());
JSObject* newObject = construct(globalObject, constructor, args, "Species construction did not get a valid constructor"_s);
RETURN_IF_EXCEPTION(scope, exceptionResult);
return std::pair { SpeciesConstructResult::CreatedObject, newObject };
}
ALWAYS_INLINE JSValue getProperty(JSGlobalObject* globalObject, JSObject* object, uint64_t index)
{
if (JSValue result = object->tryGetIndexQuickly(index))
return result;
// Don't return undefined if the property is not found.
return object->getIfPropertyExists(globalObject, index);
}
ALWAYS_INLINE void setLength(JSGlobalObject* globalObject, VM& vm, JSObject* obj, uint64_t value)
{
auto scope = DECLARE_THROW_SCOPE(vm);
static constexpr bool throwException = true;
if (LIKELY(isJSArray(obj))) {
if (UNLIKELY(value > UINT32_MAX)) {
throwRangeError(globalObject, scope, "Invalid array length"_s);
return;
}
scope.release();
jsCast<JSArray*>(obj)->setLength(globalObject, static_cast<uint32_t>(value), throwException);
return;
}
scope.release();
PutPropertySlot slot(obj, throwException);
obj->methodTable()->put(obj, globalObject, vm.propertyNames->length, jsNumber(value), slot);
}
// The shift/unshift function implement the shift/unshift behaviour required
// by the corresponding array prototype methods, and by splice. In both cases,
// the methods are operating an an array or array like object.
//
// header currentCount (remainder)
// [------][------------][-----------]
// header resultCount (remainder)
// [------][-----------][-----------]
//
// The set of properties in the range 'header' must be unchanged. The set of
// properties in the range 'remainder' (where remainder = length - header -
// currentCount) will be shifted to the left or right as appropriate; in the
// case of shift this must be removing values, in the case of unshift this
// must be introducing new values.
template<JSArray::ShiftCountMode shiftCountMode>
void shift(JSGlobalObject* globalObject, JSObject* thisObj, uint64_t header, uint64_t currentCount, uint64_t resultCount, uint64_t length)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
RELEASE_ASSERT(currentCount > resultCount);
uint64_t count = currentCount - resultCount;
RELEASE_ASSERT(header <= length);
RELEASE_ASSERT(currentCount <= (length - header));
if (isJSArray(thisObj)) {
JSArray* array = asArray(thisObj);
uint32_t header32 = static_cast<uint32_t>(header);
ASSERT(header32 == header);
if (array->length() == length && array->shiftCount<shiftCountMode>(globalObject, header32, static_cast<uint32_t>(count)))
return;
header = header32;
}
for (uint64_t k = header; k < length - currentCount; ++k) {
uint64_t from = k + currentCount;
uint64_t to = k + resultCount;
JSValue value = getProperty(globalObject, thisObj, from);
RETURN_IF_EXCEPTION(scope, void());
if (value) {
thisObj->putByIndexInline(globalObject, to, value, true);
RETURN_IF_EXCEPTION(scope, void());
} else {
bool success = thisObj->deleteProperty(globalObject, to);
RETURN_IF_EXCEPTION(scope, void());
if (!success) {
throwTypeError(globalObject, scope, UnableToDeletePropertyError);
return;
}
}
}
for (uint64_t k = length; k > length - count; --k) {
bool success = thisObj->deleteProperty(globalObject, k - 1);
RETURN_IF_EXCEPTION(scope, void());
if (!success) {
throwTypeError(globalObject, scope, UnableToDeletePropertyError);
return;
}
}
}
inline void unshift(JSGlobalObject* globalObject, JSObject* thisObj, uint64_t header, uint64_t currentCount, uint64_t resultCount, uint64_t length)
{
ASSERT(header <= maxSafeInteger());
ASSERT(currentCount <= maxSafeInteger());
ASSERT(resultCount <= maxSafeInteger());
ASSERT(length <= maxSafeInteger());
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
RELEASE_ASSERT(resultCount > currentCount);
uint64_t count = resultCount - currentCount;
RELEASE_ASSERT(header <= length);
RELEASE_ASSERT(currentCount <= (length - header));
if (isJSArray(thisObj)) {
// Spec says if we would produce an array of this size, we must throw a range error.
if (count + length > std::numeric_limits<uint32_t>::max()) {
throwRangeError(globalObject, scope, LengthExceededTheMaximumArrayLengthError);
return;
}
JSArray* array = asArray(thisObj);
if (array->length() == length) {
bool handled = array->unshiftCount(globalObject, static_cast<uint32_t>(header), static_cast<uint32_t>(count));
EXCEPTION_ASSERT(!scope.exception() || handled);
if (handled)
return;
}
}
for (uint64_t k = length - currentCount; k > header; --k) {
uint64_t from = k + currentCount - 1;
uint64_t to = k + resultCount - 1;
JSValue value = getProperty(globalObject, thisObj, from);
RETURN_IF_EXCEPTION(scope, void());
if (value) {
thisObj->putByIndexInline(globalObject, to, value, true);
RETURN_IF_EXCEPTION(scope, void());
} else {
bool success = thisObj->deleteProperty(globalObject, to);
RETURN_IF_EXCEPTION(scope, void());
if (UNLIKELY(!success)) {
throwTypeError(globalObject, scope, UnableToDeletePropertyError);
return;
}
}
}
}
inline Structure* ArrayPrototype::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(DerivedArrayType, StructureFlags), info(), ArrayClass);
}
} // namespace JSC