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ArrayPrototype.cpp
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1652 lines (1440 loc) · 71.9 KB
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/*
* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2003-2021 Apple Inc. All rights reserved.
* Copyright (C) 2003 Peter Kelly (pmk@post.com)
* Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*
*/
#include "config.h"
#include "ArrayPrototype.h"
#include "ArrayConstructor.h"
#include "ArrayPrototypeInlines.h"
#include "BuiltinNames.h"
#include "IntegrityInlines.h"
#include "JSArrayInlines.h"
#include "JSArrayIterator.h"
#include "JSCBuiltins.h"
#include "JSCInlines.h"
#include "JSImmutableButterfly.h"
#include "JSStringJoiner.h"
#include "ObjectConstructor.h"
#include "ObjectPrototypeInlines.h"
#include "StringRecursionChecker.h"
#include <algorithm>
#include <wtf/Assertions.h>
namespace JSC {
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncToLocaleString);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncJoin);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncKeys);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncEntries);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncPop);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncPush);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncReverse);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncShift);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncSlice);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncSplice);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncUnShift);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncIndexOf);
static JSC_DECLARE_HOST_FUNCTION(arrayProtoFuncLastIndexOf);
// ------------------------------ ArrayPrototype ----------------------------
const ClassInfo ArrayPrototype::s_info = { "Array"_s, &JSArray::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(ArrayPrototype) };
ArrayPrototype* ArrayPrototype::create(VM& vm, JSGlobalObject* globalObject, Structure* structure)
{
ArrayPrototype* prototype = new (NotNull, allocateCell<ArrayPrototype>(vm)) ArrayPrototype(vm, structure);
prototype->finishCreation(vm, globalObject);
return prototype;
}
// ECMA 15.4.4
ArrayPrototype::ArrayPrototype(VM& vm, Structure* structure)
: JSArray(vm, structure, nullptr)
{
}
void ArrayPrototype::finishCreation(VM& vm, JSGlobalObject* globalObject)
{
Base::finishCreation(vm);
ASSERT(inherits(info()));
putDirectWithoutTransition(vm, vm.propertyNames->toString, globalObject->arrayProtoToStringFunction(), static_cast<unsigned>(PropertyAttribute::DontEnum));
putDirectWithoutTransition(vm, vm.propertyNames->builtinNames().valuesPublicName(), globalObject->arrayProtoValuesFunction(), static_cast<unsigned>(PropertyAttribute::DontEnum));
putDirectWithoutTransition(vm, vm.propertyNames->iteratorSymbol, globalObject->arrayProtoValuesFunction(), static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->toLocaleString, arrayProtoFuncToLocaleString, static_cast<unsigned>(PropertyAttribute::DontEnum), 0, ImplementationVisibility::Public);
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().concatPublicName(), arrayPrototypeConcatCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().fillPublicName(), arrayPrototypeFillCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->join, arrayProtoFuncJoin, static_cast<unsigned>(PropertyAttribute::DontEnum), 1, ImplementationVisibility::Public);
JSC_NATIVE_INTRINSIC_FUNCTION_WITHOUT_TRANSITION("pop"_s, arrayProtoFuncPop, static_cast<unsigned>(PropertyAttribute::DontEnum), 0, ImplementationVisibility::Public, ArrayPopIntrinsic);
JSC_NATIVE_INTRINSIC_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().pushPublicName(), arrayProtoFuncPush, static_cast<unsigned>(PropertyAttribute::DontEnum), 1, ImplementationVisibility::Public, ArrayPushIntrinsic);
JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION("reverse"_s, arrayProtoFuncReverse, static_cast<unsigned>(PropertyAttribute::DontEnum), 0, ImplementationVisibility::Public);
JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().shiftPublicName(), arrayProtoFuncShift, static_cast<unsigned>(PropertyAttribute::DontEnum), 0, ImplementationVisibility::Public);
JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().shiftPrivateName(), arrayProtoFuncShift, PropertyAttribute::DontEnum | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly, 0, ImplementationVisibility::Public);
JSC_NATIVE_INTRINSIC_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->slice, arrayProtoFuncSlice, static_cast<unsigned>(PropertyAttribute::DontEnum), 2, ImplementationVisibility::Public, ArraySliceIntrinsic);
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().sortPublicName(), arrayPrototypeSortCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_NATIVE_INTRINSIC_FUNCTION_WITHOUT_TRANSITION("splice"_s, arrayProtoFuncSplice, static_cast<unsigned>(PropertyAttribute::DontEnum), 2, ImplementationVisibility::Public, ArraySpliceIntrinsic);
JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION("unshift"_s, arrayProtoFuncUnShift, static_cast<unsigned>(PropertyAttribute::DontEnum), 1, ImplementationVisibility::Public);
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().everyPublicName(), arrayPrototypeEveryCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().forEachPublicName(), arrayPrototypeForEachCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().somePublicName(), arrayPrototypeSomeCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_NATIVE_INTRINSIC_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().indexOfPublicName(), arrayProtoFuncIndexOf, static_cast<unsigned>(PropertyAttribute::DontEnum), 1, ImplementationVisibility::Public, ArrayIndexOfIntrinsic);
JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION("lastIndexOf"_s, arrayProtoFuncLastIndexOf, static_cast<unsigned>(PropertyAttribute::DontEnum), 1, ImplementationVisibility::Public);
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().filterPublicName(), arrayPrototypeFilterCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().flatPublicName(), arrayPrototypeFlatCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().flatMapPublicName(), arrayPrototypeFlatMapCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().reducePublicName(), arrayPrototypeReduceCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().reduceRightPublicName(), arrayPrototypeReduceRightCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().mapPublicName(), arrayPrototypeMapCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_NATIVE_INTRINSIC_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().keysPublicName(), arrayProtoFuncKeys, static_cast<unsigned>(PropertyAttribute::DontEnum), 0, ImplementationVisibility::Public, ArrayKeysIntrinsic);
JSC_NATIVE_INTRINSIC_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().entriesPublicName(), arrayProtoFuncEntries, static_cast<unsigned>(PropertyAttribute::DontEnum), 0, ImplementationVisibility::Public, ArrayEntriesIntrinsic);
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().findPublicName(), arrayPrototypeFindCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().findLastPublicName(), arrayPrototypeFindLastCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().findIndexPublicName(), arrayPrototypeFindIndexCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().findLastIndexPublicName(), arrayPrototypeFindLastIndexCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().includesPublicName(), arrayPrototypeIncludesCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().copyWithinPublicName(), arrayPrototypeCopyWithinCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().atPublicName(), arrayPrototypeAtCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().toReversedPublicName(), arrayPrototypeToReversedCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().toSortedPublicName(), arrayPrototypeToSortedCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().toSplicedPublicName(), arrayPrototypeToSplicedCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
JSC_BUILTIN_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->builtinNames().withPublicName(), arrayPrototypeWithCodeGenerator, static_cast<unsigned>(PropertyAttribute::DontEnum));
putDirectWithoutTransition(vm, vm.propertyNames->builtinNames().entriesPrivateName(), getDirect(vm, vm.propertyNames->builtinNames().entriesPublicName()), static_cast<unsigned>(PropertyAttribute::ReadOnly));
putDirectWithoutTransition(vm, vm.propertyNames->builtinNames().forEachPrivateName(), getDirect(vm, vm.propertyNames->builtinNames().forEachPublicName()), static_cast<unsigned>(PropertyAttribute::ReadOnly));
putDirectWithoutTransition(vm, vm.propertyNames->builtinNames().includesPrivateName(), getDirect(vm, vm.propertyNames->builtinNames().includesPublicName()), static_cast<unsigned>(PropertyAttribute::ReadOnly));
putDirectWithoutTransition(vm, vm.propertyNames->builtinNames().indexOfPrivateName(), getDirect(vm, vm.propertyNames->builtinNames().indexOfPublicName()), static_cast<unsigned>(PropertyAttribute::ReadOnly));
putDirectWithoutTransition(vm, vm.propertyNames->builtinNames().keysPrivateName(), getDirect(vm, vm.propertyNames->builtinNames().keysPublicName()), static_cast<unsigned>(PropertyAttribute::ReadOnly));
putDirectWithoutTransition(vm, vm.propertyNames->builtinNames().mapPrivateName(), getDirect(vm, vm.propertyNames->builtinNames().mapPublicName()), static_cast<unsigned>(PropertyAttribute::ReadOnly));
putDirectWithoutTransition(vm, vm.propertyNames->builtinNames().popPrivateName(), getDirect(vm, vm.propertyNames->builtinNames().popPublicName()), static_cast<unsigned>(PropertyAttribute::ReadOnly));
putDirectWithoutTransition(vm, vm.propertyNames->builtinNames().valuesPrivateName(), globalObject->arrayProtoValuesFunction(), static_cast<unsigned>(PropertyAttribute::ReadOnly));
JSObject* unscopables = constructEmptyObject(vm, globalObject->nullPrototypeObjectStructure());
unscopables->convertToDictionary(vm);
const Identifier* const unscopableNames[] = {
&vm.propertyNames->builtinNames().atPublicName(),
&vm.propertyNames->builtinNames().copyWithinPublicName(),
&vm.propertyNames->builtinNames().entriesPublicName(),
&vm.propertyNames->builtinNames().fillPublicName(),
&vm.propertyNames->builtinNames().findPublicName(),
&vm.propertyNames->builtinNames().findIndexPublicName(),
&vm.propertyNames->builtinNames().findLastPublicName(),
&vm.propertyNames->builtinNames().findLastIndexPublicName(),
&vm.propertyNames->builtinNames().flatPublicName(),
&vm.propertyNames->builtinNames().flatMapPublicName(),
&vm.propertyNames->builtinNames().includesPublicName(),
&vm.propertyNames->builtinNames().keysPublicName(),
&vm.propertyNames->builtinNames().toReversedPublicName(),
&vm.propertyNames->builtinNames().toSortedPublicName(),
&vm.propertyNames->builtinNames().toSplicedPublicName(),
&vm.propertyNames->builtinNames().valuesPublicName()
};
for (const auto* unscopableName : unscopableNames) {
if (unscopableName)
unscopables->putDirect(vm, *unscopableName, jsBoolean(true));
}
putDirectWithoutTransition(vm, vm.propertyNames->unscopablesSymbol, unscopables, PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly);
}
// ------------------------------ Array Functions ----------------------------
static inline uint64_t argumentClampedIndexFromStartOrEnd(JSGlobalObject* globalObject, JSValue value, uint64_t length, uint64_t undefinedValue = 0)
{
if (value.isUndefined())
return undefinedValue;
if (LIKELY(value.isInt32())) {
int64_t indexInt64 = value.asInt32();
if (indexInt64 < 0) {
indexInt64 += length;
return indexInt64 < 0 ? 0 : static_cast<uint64_t>(indexInt64);
}
uint64_t indexUInt64 = static_cast<uint64_t>(indexInt64);
return std::min(indexUInt64, length);
}
double indexDouble = value.toIntegerOrInfinity(globalObject);
if (indexDouble < 0) {
indexDouble += length;
return indexDouble < 0 ? 0 : static_cast<uint64_t>(indexDouble);
}
return indexDouble > length ? length : static_cast<uint64_t>(indexDouble);
}
inline bool canUseFastJoin(const JSObject* thisObject)
{
switch (thisObject->indexingType()) {
case ALL_CONTIGUOUS_INDEXING_TYPES:
case ALL_INT32_INDEXING_TYPES:
case ALL_DOUBLE_INDEXING_TYPES:
case ALL_UNDECIDED_INDEXING_TYPES:
return true;
default:
break;
}
return false;
}
inline bool holesMustForwardToPrototype(JSObject* object)
{
return object->structure()->holesMustForwardToPrototype(object);
}
inline bool isHole(double value)
{
return std::isnan(value);
}
inline bool isHole(const WriteBarrier<Unknown>& value)
{
return !value;
}
template<typename T>
inline bool containsHole(T* data, unsigned length)
{
for (unsigned i = 0; i < length; ++i) {
if (isHole(data[i]))
return true;
}
return false;
}
inline JSValue fastJoin(JSGlobalObject* globalObject, JSObject* thisObject, StringView separator, unsigned length, bool& sawHoles, bool& genericCase)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSStringJoiner joiner(separator);
unsigned i = 0;
switch (thisObject->indexingType()) {
case ALL_INT32_INDEXING_TYPES: {
auto& butterfly = *thisObject->butterfly();
if (UNLIKELY(length > butterfly.publicLength()))
break;
joiner.reserveCapacity(globalObject, length);
RETURN_IF_EXCEPTION(scope, { });
auto data = butterfly.contiguous().data();
bool holesKnownToBeOK = false;
for (; i < length; ++i) {
JSValue value = data[i].get();
if (LIKELY(value))
joiner.appendNumber(vm, value.asInt32());
else {
sawHoles = true;
if (!holesKnownToBeOK) {
if (holesMustForwardToPrototype(thisObject))
goto generalCase;
holesKnownToBeOK = true;
}
joiner.appendEmptyString();
}
}
RELEASE_AND_RETURN(scope, joiner.join(globalObject));
}
case ALL_CONTIGUOUS_INDEXING_TYPES: {
auto& butterfly = *thisObject->butterfly();
if (UNLIKELY(length > butterfly.publicLength()))
break;
auto data = butterfly.contiguous().data();
bool holesKnownToBeOK = false;
for (; i < length; ++i) {
if (JSValue value = data[i].get()) {
if (!joiner.appendWithoutSideEffects(globalObject, value))
goto generalCase;
RETURN_IF_EXCEPTION(scope, { });
} else {
sawHoles = true;
if (!holesKnownToBeOK) {
if (holesMustForwardToPrototype(thisObject))
goto generalCase;
holesKnownToBeOK = true;
}
joiner.appendEmptyString();
}
}
RELEASE_AND_RETURN(scope, joiner.join(globalObject));
}
case ALL_DOUBLE_INDEXING_TYPES: {
auto& butterfly = *thisObject->butterfly();
if (UNLIKELY(length > butterfly.publicLength()))
break;
joiner.reserveCapacity(globalObject, length);
RETURN_IF_EXCEPTION(scope, { });
auto data = butterfly.contiguousDouble().data();
bool holesKnownToBeOK = false;
for (; i < length; ++i) {
double value = data[i];
if (LIKELY(!isHole(value)))
joiner.appendNumber(vm, value);
else {
sawHoles = true;
if (!holesKnownToBeOK) {
if (holesMustForwardToPrototype(thisObject))
goto generalCase;
holesKnownToBeOK = true;
}
joiner.appendEmptyString();
}
}
RELEASE_AND_RETURN(scope, joiner.join(globalObject));
}
case ALL_UNDECIDED_INDEXING_TYPES: {
if (length && holesMustForwardToPrototype(thisObject))
goto generalCase;
switch (separator.length()) {
case 0:
RELEASE_AND_RETURN(scope, jsEmptyString(vm));
case 1: {
if (length <= 1)
RELEASE_AND_RETURN(scope, jsEmptyString(vm));
if (separator.is8Bit())
RELEASE_AND_RETURN(scope, repeatCharacter(globalObject, separator.characters8()[0], length - 1));
RELEASE_AND_RETURN(scope, repeatCharacter(globalObject, separator.characters16()[0], length - 1));
default:
JSString* result = jsEmptyString(vm);
if (length <= 1)
return result;
JSString* operand = jsString(vm, separator);
RETURN_IF_EXCEPTION(scope, { });
unsigned count = length - 1;
for (;;) {
if (count & 1) {
result = jsString(globalObject, result, operand);
RETURN_IF_EXCEPTION(scope, { });
}
count >>= 1;
if (!count)
return result;
operand = jsString(globalObject, operand, operand);
RETURN_IF_EXCEPTION(scope, { });
}
}
}
}
}
generalCase:
genericCase = true;
for (; i < length; ++i) {
JSValue element = thisObject->getIndex(globalObject, i);
RETURN_IF_EXCEPTION(scope, { });
joiner.append(globalObject, element);
RETURN_IF_EXCEPTION(scope, { });
}
RELEASE_AND_RETURN(scope, joiner.join(globalObject));
}
ALWAYS_INLINE JSValue fastJoin(JSGlobalObject* globalObject, JSObject* thisObject, StringView separator, unsigned length)
{
bool sawHoles = false;
bool genericCase = false;
return fastJoin(globalObject, thisObject, separator, length, sawHoles, genericCase);
}
inline bool canUseDefaultArrayJoinForToString(JSObject* thisObject)
{
JSGlobalObject* globalObject = thisObject->globalObject();
if (globalObject->arrayJoinWatchpointSet().state() != IsWatched)
return false;
Structure* structure = thisObject->structure();
// This is the fast case. Many arrays will be an original array.
// We are doing very simple check here. If we do more complicated checks like looking into getDirect "join" of thisObject,
// it would be possible that just looking into "join" function will show the same performance.
return globalObject->isOriginalArrayStructure(structure);
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncToString, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue thisValue = callFrame->thisValue().toThis(globalObject, ECMAMode::strict());
// 1. Let array be the result of calling ToObject on the this value.
JSObject* thisObject = thisValue.toObject(globalObject);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
Integrity::auditStructureID(thisObject->structureID());
if (UNLIKELY(!canUseDefaultArrayJoinForToString(thisObject))) {
// 2. Let func be the result of calling the [[Get]] internal method of array with argument "join".
JSValue function = thisObject->get(globalObject, vm.propertyNames->join);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
// 3. If IsCallable(func) is false, then let func be the standard built-in method Object.prototype.toString (15.2.4.2).
auto callData = JSC::getCallData(function);
if (UNLIKELY(callData.type == CallData::Type::None))
RELEASE_AND_RETURN(scope, JSValue::encode(objectPrototypeToString(globalObject, thisObject)));
// 4. Return the result of calling the [[Call]] internal method of func providing array as the this value and an empty arguments list.
if (!isJSArray(thisObject) || callData.type != CallData::Type::Native || callData.native.function != arrayProtoFuncJoin)
RELEASE_AND_RETURN(scope, JSValue::encode(call(globalObject, function, callData, thisObject, *vm.emptyList)));
}
ASSERT(isJSArray(thisValue));
JSArray* thisArray = asArray(thisValue);
unsigned length = thisArray->length();
StringRecursionChecker checker(globalObject, thisArray);
EXCEPTION_ASSERT(!scope.exception() || checker.earlyReturnValue());
if (JSValue earlyReturnValue = checker.earlyReturnValue())
return JSValue::encode(earlyReturnValue);
if (LIKELY(canUseFastJoin(thisArray))) {
const LChar comma = ',';
bool isCoW = isCopyOnWrite(thisArray->indexingMode());
JSImmutableButterfly* immutableButterfly = nullptr;
if (isCoW) {
immutableButterfly = JSImmutableButterfly::fromButterfly(thisArray->butterfly());
auto iter = vm.heap.immutableButterflyToStringCache.find(immutableButterfly);
if (iter != vm.heap.immutableButterflyToStringCache.end())
return JSValue::encode(iter->value);
}
bool sawHoles = false;
bool genericCase = false;
JSValue result = fastJoin(globalObject, thisArray, { &comma, 1 }, length, sawHoles, genericCase);
RETURN_IF_EXCEPTION(scope, { });
if (!sawHoles && !genericCase && result && isJSString(result) && isCoW) {
ASSERT(JSImmutableButterfly::fromButterfly(thisArray->butterfly()) == immutableButterfly);
vm.heap.immutableButterflyToStringCache.add(immutableButterfly, jsCast<JSString*>(result));
}
return JSValue::encode(result);
}
JSStringJoiner joiner(","_s);
for (unsigned i = 0; i < length; ++i) {
JSValue element = thisArray->tryGetIndexQuickly(i);
if (!element) {
element = thisArray->get(globalObject, i);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
}
joiner.append(globalObject, element);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
}
RELEASE_AND_RETURN(scope, JSValue::encode(joiner.join(globalObject)));
}
static JSString* toLocaleString(JSGlobalObject* globalObject, JSValue value, JSValue locales, JSValue options)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue toLocaleStringMethod = value.get(globalObject, vm.propertyNames->toLocaleString);
RETURN_IF_EXCEPTION(scope, { });
auto callData = JSC::getCallData(toLocaleStringMethod);
if (callData.type == CallData::Type::None) {
throwTypeError(globalObject, scope, "toLocaleString is not callable"_s);
return { };
}
MarkedArgumentBuffer arguments;
arguments.append(locales);
arguments.append(options);
ASSERT(!arguments.hasOverflowed());
JSValue result = call(globalObject, toLocaleStringMethod, callData, value, arguments);
RETURN_IF_EXCEPTION(scope, { });
RELEASE_AND_RETURN(scope, result.toString(globalObject));
}
// https://tc39.es/ecma402/#sup-array.prototype.tolocalestring
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncToLocaleString, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue thisValue = callFrame->thisValue().toThis(globalObject, ECMAMode::strict());
JSValue locales = callFrame->argument(0);
JSValue options = callFrame->argument(1);
// 1. Let array be ? ToObject(this value).
JSObject* thisObject = thisValue.toObject(globalObject);
RETURN_IF_EXCEPTION(scope, { });
StringRecursionChecker checker(globalObject, thisObject);
EXCEPTION_ASSERT(!scope.exception() || checker.earlyReturnValue());
if (JSValue earlyReturnValue = checker.earlyReturnValue())
return JSValue::encode(earlyReturnValue);
// 2. Let len be ? ToLength(? Get(array, "length")).
uint64_t length = toLength(globalObject, thisObject);
RETURN_IF_EXCEPTION(scope, { });
// 3. Let separator be the String value for the list-separator String appropriate for
// the host environment's current locale (this is derived in an implementation-defined way).
const LChar comma = ',';
JSString* separator = jsSingleCharacterString(vm, comma);
// 4. Let R be the empty String.
if (!length)
return JSValue::encode(jsEmptyString(vm));
// 5. Let k be 0.
JSValue element0 = thisObject->getIndex(globalObject, 0);
RETURN_IF_EXCEPTION(scope, { });
// 6. Repeat, while k < len,
// 6.a. If k > 0, then
// 6.a.i. Set R to the string-concatenation of R and separator.
JSString* r = nullptr;
if (element0.isUndefinedOrNull())
r = jsEmptyString(vm);
else {
r = toLocaleString(globalObject, element0, locales, options);
RETURN_IF_EXCEPTION(scope, { });
}
// 8. Let k be 1.
// 9. Repeat, while k < len
// 9.e Increase k by 1..
for (uint64_t k = 1; k < length; ++k) {
// 6.b. Let nextElement be ? Get(array, ! ToString(k)).
JSValue element = thisObject->getIndex(globalObject, k);
RETURN_IF_EXCEPTION(scope, { });
// c. If nextElement is not undefined or null, then
JSString* next = nullptr;
if (element.isUndefinedOrNull())
next = jsEmptyString(vm);
else {
// i. Let S be ? ToString(? Invoke(nextElement, "toLocaleString", « locales, options »)).
// ii. Set R to the string-concatenation of R and S.
next = toLocaleString(globalObject, element, locales, options);
RETURN_IF_EXCEPTION(scope, { });
}
// d. Increase k by 1.
r = jsString(globalObject, r, separator, next);
RETURN_IF_EXCEPTION(scope, { });
}
// 7. Return R.
return JSValue::encode(r);
}
static JSValue slowJoin(JSGlobalObject* globalObject, JSObject* thisObject, JSString* separator, uint64_t length)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// 5. If len is zero, return the empty String.
if (!length)
return jsEmptyString(vm);
// 6. Let element0 be Get(O, "0").
JSValue element0 = thisObject->getIndex(globalObject, 0);
RETURN_IF_EXCEPTION(scope, { });
// 7. If element0 is undefined or null, let R be the empty String; otherwise, let R be ? ToString(element0).
JSString* r = nullptr;
if (element0.isUndefinedOrNull())
r = jsEmptyString(vm);
else
r = element0.toString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
// 8. Let k be 1.
// 9. Repeat, while k < len
// 9.e Increase k by 1..
for (uint64_t k = 1; k < length; ++k) {
// b. Let element be ? Get(O, ! ToString(k)).
JSValue element = thisObject->getIndex(globalObject, k);
RETURN_IF_EXCEPTION(scope, { });
// c. If element is undefined or null, let next be the empty String; otherwise, let next be ? ToString(element).
JSString* next = nullptr;
if (element.isUndefinedOrNull()) {
if (!separator->length())
continue;
next = jsEmptyString(vm);
} else
next = element.toString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
// a. Let S be the String value produced by concatenating R and sep.
// d. Let R be a String value produced by concatenating S and next.
r = jsString(globalObject, r, separator, next);
RETURN_IF_EXCEPTION(scope, { });
}
// 10. Return R.
return r;
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncJoin, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// 1. Let O be ? ToObject(this value).
JSObject* thisObject = callFrame->thisValue().toThis(globalObject, ECMAMode::strict()).toObject(globalObject);
EXCEPTION_ASSERT(!!scope.exception() == !thisObject);
if (UNLIKELY(!thisObject))
return encodedJSValue();
StringRecursionChecker checker(globalObject, thisObject);
EXCEPTION_ASSERT(!scope.exception() || checker.earlyReturnValue());
if (JSValue earlyReturnValue = checker.earlyReturnValue())
return JSValue::encode(earlyReturnValue);
// 2. Let len be ? ToLength(? Get(O, "length")).
uint64_t length = toLength(globalObject, thisObject);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
// 3. If separator is undefined, let separator be the single-element String ",".
JSValue separatorValue = callFrame->argument(0);
if (separatorValue.isUndefined()) {
const LChar comma = ',';
if (UNLIKELY(length > std::numeric_limits<unsigned>::max() || !canUseFastJoin(thisObject))) {
JSString* jsSeparator = jsSingleCharacterString(vm, comma);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
RELEASE_AND_RETURN(scope, JSValue::encode(slowJoin(globalObject, thisObject, jsSeparator, length)));
}
unsigned unsignedLength = static_cast<unsigned>(length);
ASSERT(static_cast<double>(unsignedLength) == length);
RELEASE_AND_RETURN(scope, JSValue::encode(fastJoin(globalObject, thisObject, { &comma, 1 }, unsignedLength)));
}
// 4. Let sep be ? ToString(separator).
JSString* jsSeparator = separatorValue.toString(globalObject);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
if (UNLIKELY(length > std::numeric_limits<unsigned>::max() || !canUseFastJoin(thisObject)))
RELEASE_AND_RETURN(scope, JSValue::encode(slowJoin(globalObject, thisObject, jsSeparator, length)));
auto viewWithString = jsSeparator->viewWithUnderlyingString(globalObject);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
RELEASE_AND_RETURN(scope, JSValue::encode(fastJoin(globalObject, thisObject, viewWithString.view, length)));
}
inline EncodedJSValue createArrayIteratorObject(JSGlobalObject* globalObject, CallFrame* callFrame, IterationKind kind)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSObject* thisObject = callFrame->thisValue().toThis(globalObject, ECMAMode::strict()).toObject(globalObject);
EXCEPTION_ASSERT(!!scope.exception() == !thisObject);
UNUSED_PARAM(scope);
if (UNLIKELY(!thisObject))
return encodedJSValue();
return JSValue::encode(JSArrayIterator::create(vm, globalObject->arrayIteratorStructure(), thisObject, jsNumber(static_cast<unsigned>(kind))));
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncValues, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return createArrayIteratorObject(globalObject, callFrame, IterationKind::Values);
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncEntries, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return createArrayIteratorObject(globalObject, callFrame, IterationKind::Entries);
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncKeys, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return createArrayIteratorObject(globalObject, callFrame, IterationKind::Keys);
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncPop, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue thisValue = callFrame->thisValue().toThis(globalObject, ECMAMode::strict());
if (isJSArray(thisValue))
RELEASE_AND_RETURN(scope, JSValue::encode(asArray(thisValue)->pop(globalObject)));
JSObject* thisObj = thisValue.toObject(globalObject);
EXCEPTION_ASSERT(!!scope.exception() == !thisObj);
if (UNLIKELY(!thisObj))
return encodedJSValue();
uint64_t length = toLength(globalObject, thisObj);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
if (length == 0) {
scope.release();
setLength(globalObject, vm, thisObj, length);
return JSValue::encode(jsUndefined());
}
static_assert(MAX_ARRAY_INDEX + 1 > MAX_ARRAY_INDEX);
uint64_t index = length - 1;
JSValue result = thisObj->get(globalObject, index);
RETURN_IF_EXCEPTION(scope, { });
bool success = thisObj->deleteProperty(globalObject, index);
RETURN_IF_EXCEPTION(scope, { });
if (UNLIKELY(!success)) {
throwTypeError(globalObject, scope, UnableToDeletePropertyError);
return { };
}
scope.release();
setLength(globalObject, vm, thisObj, index);
return JSValue::encode(result);
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncPush, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue thisValue = callFrame->thisValue().toThis(globalObject, ECMAMode::strict());
if (LIKELY(isJSArray(thisValue) && callFrame->argumentCount() == 1)) {
JSArray* array = asArray(thisValue);
scope.release();
array->pushInline(globalObject, callFrame->uncheckedArgument(0));
return JSValue::encode(jsNumber(array->length()));
}
JSObject* thisObj = thisValue.toObject(globalObject);
EXCEPTION_ASSERT(!!scope.exception() == !thisObj);
if (UNLIKELY(!thisObj))
return encodedJSValue();
uint64_t length = toLength(globalObject, thisObj);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
unsigned argCount = callFrame->argumentCount();
if (UNLIKELY(length + argCount > static_cast<uint64_t>(maxSafeInteger())))
return throwVMTypeError(globalObject, scope, "push cannot produce an array of length larger than (2 ** 53) - 1"_s);
for (unsigned n = 0; n < argCount; n++) {
thisObj->putByIndexInline(globalObject, length + n, callFrame->uncheckedArgument(n), true);
RETURN_IF_EXCEPTION(scope, { });
}
uint64_t newLength = length + argCount;
scope.release();
setLength(globalObject, vm, thisObj, newLength);
return JSValue::encode(jsNumber(newLength));
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncReverse, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSObject* thisObject = callFrame->thisValue().toThis(globalObject, ECMAMode::strict()).toObject(globalObject);
EXCEPTION_ASSERT(!!scope.exception() == !thisObject);
if (UNLIKELY(!thisObject))
return encodedJSValue();
uint64_t length = toLength(globalObject, thisObject);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
thisObject->ensureWritable(vm);
switch (thisObject->indexingType()) {
case ALL_CONTIGUOUS_INDEXING_TYPES:
case ALL_INT32_INDEXING_TYPES: {
auto& butterfly = *thisObject->butterfly();
if (length > butterfly.publicLength())
break;
auto data = butterfly.contiguous().data();
if (containsHole(data, static_cast<uint32_t>(length)) && holesMustForwardToPrototype(thisObject))
break;
std::reverse(data, data + length);
if (!hasInt32(thisObject->indexingType()))
vm.writeBarrier(thisObject);
return JSValue::encode(thisObject);
}
case ALL_DOUBLE_INDEXING_TYPES: {
auto& butterfly = *thisObject->butterfly();
if (length > butterfly.publicLength())
break;
auto data = butterfly.contiguousDouble().data();
if (containsHole(data, static_cast<uint32_t>(length)) && holesMustForwardToPrototype(thisObject))
break;
std::reverse(data, data + length);
return JSValue::encode(thisObject);
}
case ALL_ARRAY_STORAGE_INDEXING_TYPES: {
auto& storage = *thisObject->butterfly()->arrayStorage();
if (length > storage.vectorLength())
break;
if (storage.hasHoles() && holesMustForwardToPrototype(thisObject))
break;
auto data = storage.vector().data();
std::reverse(data, data + length);
vm.writeBarrier(thisObject);
return JSValue::encode(thisObject);
}
}
uint64_t middle = length / 2;
for (uint64_t lower = 0; lower < middle; lower++) {
uint64_t upper = length - lower - 1;
bool lowerExists = thisObject->hasProperty(globalObject, lower);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
JSValue lowerValue;
if (lowerExists) {
lowerValue = thisObject->get(globalObject, lower);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
}
bool upperExists = thisObject->hasProperty(globalObject, upper);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
JSValue upperValue;
if (upperExists) {
upperValue = thisObject->get(globalObject, upper);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
}
if (!lowerExists && !upperExists) {
// Spec says to do nothing when neither lower nor upper exist.
continue;
}
if (upperExists) {
thisObject->putByIndexInline(globalObject, lower, upperValue, true);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
} else {
bool success = thisObject->deleteProperty(globalObject, lower);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
if (UNLIKELY(!success)) {
throwTypeError(globalObject, scope, UnableToDeletePropertyError);
return encodedJSValue();
}
}
if (lowerExists) {
thisObject->putByIndexInline(globalObject, upper, lowerValue, true);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
} else {
bool success = thisObject->deleteProperty(globalObject, upper);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
if (UNLIKELY(!success)) {
throwTypeError(globalObject, scope, UnableToDeletePropertyError);
return encodedJSValue();
}
}
}
return JSValue::encode(thisObject);
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncShift, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSObject* thisObj = callFrame->thisValue().toThis(globalObject, ECMAMode::strict()).toObject(globalObject);
EXCEPTION_ASSERT(!!scope.exception() == !thisObj);
if (UNLIKELY(!thisObj))
return encodedJSValue();
uint64_t length = toLength(globalObject, thisObj);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
if (length == 0) {
scope.release();
setLength(globalObject, vm, thisObj, length);
return JSValue::encode(jsUndefined());
}
JSValue result = thisObj->getIndex(globalObject, 0);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
shift<JSArray::ShiftCountForShift>(globalObject, thisObj, 0, 1, 0, length);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
scope.release();
setLength(globalObject, vm, thisObj, length - 1);
return JSValue::encode(result);
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncSlice, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
// https://tc39.github.io/ecma262/#sec-array.prototype.slice
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSObject* thisObj = callFrame->thisValue().toThis(globalObject, ECMAMode::strict()).toObject(globalObject);
EXCEPTION_ASSERT(!!scope.exception() == !thisObj);
if (UNLIKELY(!thisObj))
return { };
uint64_t length = toLength(globalObject, thisObj);
RETURN_IF_EXCEPTION(scope, { });
uint64_t begin = argumentClampedIndexFromStartOrEnd(globalObject, callFrame->argument(0), length);
RETURN_IF_EXCEPTION(scope, { });
uint64_t end = argumentClampedIndexFromStartOrEnd(globalObject, callFrame->argument(1), length, length);
RETURN_IF_EXCEPTION(scope, { });
if (end < begin)
end = begin;
std::pair<SpeciesConstructResult, JSObject*> speciesResult = speciesConstructArray(globalObject, thisObj, end - begin);
// We can only get an exception if we call some user function.
EXCEPTION_ASSERT(!!scope.exception() == (speciesResult.first == SpeciesConstructResult::Exception));
if (UNLIKELY(speciesResult.first == SpeciesConstructResult::Exception))
return { };
if (LIKELY(speciesResult.first == SpeciesConstructResult::FastPath)) {
JSArray* result = JSArray::fastSlice(globalObject, thisObj, begin, end - begin);
if (result) {
scope.assertNoExceptionExceptTermination();
return JSValue::encode(result);
}
RETURN_IF_EXCEPTION(scope, { });
}
JSObject* result;
if (speciesResult.first == SpeciesConstructResult::CreatedObject)
result = speciesResult.second;
else {
if (UNLIKELY(end - begin > std::numeric_limits<uint32_t>::max())) {
throwRangeError(globalObject, scope, LengthExceededTheMaximumArrayLengthError);
return encodedJSValue();
}
result = constructEmptyArray(globalObject, nullptr, static_cast<uint32_t>(end - begin));
RETURN_IF_EXCEPTION(scope, { });
}
// Document that we need to keep the source array alive until after anything
// that can GC (e.g. allocating the result array).
thisObj->use();
uint64_t n = 0;
for (uint64_t k = begin; k < end; k++, n++) {
JSValue v = getProperty(globalObject, thisObj, k);
RETURN_IF_EXCEPTION(scope, { });
if (v) {
result->putDirectIndex(globalObject, n, v, 0, PutDirectIndexShouldThrow);
RETURN_IF_EXCEPTION(scope, { });
}
}
scope.release();
setLength(globalObject, vm, result, n);
return JSValue::encode(result);
}
JSC_DEFINE_HOST_FUNCTION(arrayProtoFuncSplice, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
// 15.4.4.12
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSObject* thisObj = callFrame->thisValue().toThis(globalObject, ECMAMode::strict()).toObject(globalObject);
EXCEPTION_ASSERT(!!scope.exception() == !thisObj);
if (UNLIKELY(!thisObj))
return encodedJSValue();
uint64_t length = toLength(globalObject, thisObj);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
if (!callFrame->argumentCount()) {
std::pair<SpeciesConstructResult, JSObject*> speciesResult = speciesConstructArray(globalObject, thisObj, 0);
EXCEPTION_ASSERT(!!scope.exception() == (speciesResult.first == SpeciesConstructResult::Exception));
if (UNLIKELY(speciesResult.first == SpeciesConstructResult::Exception))
return encodedJSValue();
JSObject* result;
if (speciesResult.first == SpeciesConstructResult::CreatedObject)
result = speciesResult.second;
else {
result = constructEmptyArray(globalObject, nullptr);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
}
setLength(globalObject, vm, result, 0);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
scope.release();
setLength(globalObject, vm, thisObj, length);
return JSValue::encode(result);
}
uint64_t actualStart = argumentClampedIndexFromStartOrEnd(globalObject, callFrame->argument(0), length);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
uint64_t actualDeleteCount = length - actualStart;
if (callFrame->argumentCount() > 1) {
double deleteCount = callFrame->uncheckedArgument(1).toIntegerOrInfinity(globalObject);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
if (deleteCount < 0)
actualDeleteCount = 0;
else if (deleteCount > length - actualStart)
actualDeleteCount = length - actualStart;
else
actualDeleteCount = static_cast<uint64_t>(deleteCount);
}
unsigned itemCount = std::max<int>(callFrame->argumentCount() - 2, 0);
if (UNLIKELY(length - actualDeleteCount + itemCount > static_cast<uint64_t>(maxSafeInteger())))
return throwVMTypeError(globalObject, scope, "Splice cannot produce an array of length larger than (2 ** 53) - 1"_s);
std::pair<SpeciesConstructResult, JSObject*> speciesResult = speciesConstructArray(globalObject, thisObj, actualDeleteCount);
EXCEPTION_ASSERT(!!scope.exception() == (speciesResult.first == SpeciesConstructResult::Exception));
if (speciesResult.first == SpeciesConstructResult::Exception)
return JSValue::encode(jsUndefined());
JSObject* result = nullptr;