/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- * vim: set ts=8 sts=2 et sw=2 tw=80: * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include "builtin/DataViewObject.h" #include "mozilla/Casting.h" #include "mozilla/EndianUtils.h" #include "mozilla/IntegerTypeTraits.h" #include "mozilla/WrappingOperations.h" #include #include #include #include "jsnum.h" #include "jit/AtomicOperations.h" #include "jit/InlinableNatives.h" #include "js/Conversions.h" #include "js/experimental/TypedData.h" // JS_NewDataView #include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_* #include "js/PropertySpec.h" #include "js/Wrapper.h" #include "util/DifferentialTesting.h" #include "vm/ArrayBufferObject.h" #include "vm/Compartment.h" #include "vm/GlobalObject.h" #include "vm/Interpreter.h" #include "vm/JSContext.h" #include "vm/JSObject.h" #include "vm/SharedMem.h" #include "vm/Uint8Clamped.h" #include "vm/WrapperObject.h" #include "vm/ArrayBufferObject-inl.h" #include "vm/NativeObject-inl.h" using namespace js; using JS::CanonicalizeNaN; using JS::ToInt32; using mozilla::AssertedCast; using mozilla::WrapToSigned; DataViewObject* DataViewObject::create( JSContext* cx, size_t byteOffset, size_t byteLength, Handle arrayBuffer, HandleObject proto) { if (arrayBuffer->isDetached()) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_DETACHED); return nullptr; } DataViewObject* obj = NewObjectWithClassProto(cx, proto); if (!obj || !obj->init(cx, arrayBuffer, byteOffset, byteLength, /* bytesPerElement = */ 1)) { return nullptr; } return obj; } // ES2017 draft rev 931261ecef9b047b14daacf82884134da48dfe0f // 24.3.2.1 DataView (extracted part of the main algorithm) bool DataViewObject::getAndCheckConstructorArgs(JSContext* cx, HandleObject bufobj, const CallArgs& args, size_t* byteOffsetPtr, size_t* byteLengthPtr) { // Step 3. if (!bufobj->is()) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE, "DataView", "ArrayBuffer", bufobj->getClass()->name); return false; } auto buffer = bufobj.as(); // Step 4. uint64_t offset; if (!ToIndex(cx, args.get(1), &offset)) { return false; } // Step 5. if (buffer->isDetached()) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_DETACHED); return false; } // Step 6. size_t bufferByteLength = buffer->byteLength(); // Step 7. if (offset > bufferByteLength) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_OFFSET_OUT_OF_BUFFER); return false; } MOZ_ASSERT(offset <= ArrayBufferObject::MaxByteLength); // Step 8.a uint64_t viewByteLength = bufferByteLength - offset; if (args.hasDefined(2)) { // Step 9.a. if (!ToIndex(cx, args.get(2), &viewByteLength)) { return false; } MOZ_ASSERT(offset + viewByteLength >= offset, "can't overflow: both numbers are less than " "DOUBLE_INTEGRAL_PRECISION_LIMIT"); // Step 9.b. if (offset + viewByteLength > bufferByteLength) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_INVALID_DATA_VIEW_LENGTH); return false; } } MOZ_ASSERT(viewByteLength <= ArrayBufferObject::MaxByteLength); *byteOffsetPtr = offset; *byteLengthPtr = viewByteLength; return true; } bool DataViewObject::constructSameCompartment(JSContext* cx, HandleObject bufobj, const CallArgs& args) { MOZ_ASSERT(args.isConstructing()); cx->check(bufobj); size_t byteOffset = 0; size_t byteLength = 0; if (!getAndCheckConstructorArgs(cx, bufobj, args, &byteOffset, &byteLength)) { return false; } RootedObject proto(cx); if (!GetPrototypeFromBuiltinConstructor(cx, args, JSProto_DataView, &proto)) { return false; } auto buffer = bufobj.as(); JSObject* obj = DataViewObject::create(cx, byteOffset, byteLength, buffer, proto); if (!obj) { return false; } args.rval().setObject(*obj); return true; } // Create a DataView object in another compartment. // // ES6 supports creating a DataView in global A (using global A's DataView // constructor) backed by an ArrayBuffer created in global B. // // Our DataViewObject implementation doesn't support a DataView in // compartment A backed by an ArrayBuffer in compartment B. So in this case, // we create the DataView in B (!) and return a cross-compartment wrapper. // // Extra twist: the spec says the new DataView's [[Prototype]] must be // A's DataView.prototype. So even though we're creating the DataView in B, // its [[Prototype]] must be (a cross-compartment wrapper for) the // DataView.prototype in A. bool DataViewObject::constructWrapped(JSContext* cx, HandleObject bufobj, const CallArgs& args) { MOZ_ASSERT(args.isConstructing()); MOZ_ASSERT(bufobj->is()); RootedObject unwrapped(cx, CheckedUnwrapStatic(bufobj)); if (!unwrapped) { ReportAccessDenied(cx); return false; } // NB: This entails the IsArrayBuffer check size_t byteOffset = 0; size_t byteLength = 0; if (!getAndCheckConstructorArgs(cx, unwrapped, args, &byteOffset, &byteLength)) { return false; } // Make sure to get the [[Prototype]] for the created view from this // compartment. RootedObject proto(cx); if (!GetPrototypeFromBuiltinConstructor(cx, args, JSProto_DataView, &proto)) { return false; } Rooted global(cx, cx->realm()->maybeGlobal()); if (!proto) { proto = GlobalObject::getOrCreateDataViewPrototype(cx, global); if (!proto) { return false; } } RootedObject dv(cx); { JSAutoRealm ar(cx, unwrapped); Rooted buffer(cx); buffer = &unwrapped->as(); RootedObject wrappedProto(cx, proto); if (!cx->compartment()->wrap(cx, &wrappedProto)) { return false; } dv = DataViewObject::create(cx, byteOffset, byteLength, buffer, wrappedProto); if (!dv) { return false; } } if (!cx->compartment()->wrap(cx, &dv)) { return false; } args.rval().setObject(*dv); return true; } bool DataViewObject::construct(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); if (!ThrowIfNotConstructing(cx, args, "DataView")) { return false; } RootedObject bufobj(cx); if (!GetFirstArgumentAsObject(cx, args, "DataView constructor", &bufobj)) { return false; } if (bufobj->is()) { return constructWrapped(cx, bufobj, args); } return constructSameCompartment(cx, bufobj, args); } template SharedMem DataViewObject::getDataPointer(uint64_t offset, bool* isSharedMemory) { MOZ_ASSERT(offsetIsInBounds(offset)); MOZ_ASSERT(offset < SIZE_MAX); *isSharedMemory = this->isSharedMemory(); return dataPointerEither().cast() + size_t(offset); } template static inline std::enable_if_t SwapBytes(T* value, bool isLittleEndian) { if (isLittleEndian) { mozilla::NativeEndian::swapToLittleEndianInPlace(value, 1); } else { mozilla::NativeEndian::swapToBigEndianInPlace(value, 1); } } template static inline std::enable_if_t SwapBytes(T* value, bool isLittleEndian) { // mozilla::NativeEndian doesn't support int8_t/uint8_t types. } static inline void Memcpy(uint8_t* dest, uint8_t* src, size_t nbytes) { memcpy(dest, src, nbytes); } static inline void Memcpy(uint8_t* dest, SharedMem src, size_t nbytes) { jit::AtomicOperations::memcpySafeWhenRacy(dest, src, nbytes); } static inline void Memcpy(SharedMem dest, uint8_t* src, size_t nbytes) { jit::AtomicOperations::memcpySafeWhenRacy(dest, src, nbytes); } template struct DataViewIO { using ReadWriteType = typename mozilla::UnsignedStdintTypeForSize::Type; static constexpr auto alignMask = std::min(alignof(void*), sizeof(DataType)) - 1; static void fromBuffer(DataType* dest, BufferPtrType unalignedBuffer, bool isLittleEndian) { MOZ_ASSERT((reinterpret_cast(dest) & alignMask) == 0); Memcpy((uint8_t*)dest, unalignedBuffer, sizeof(ReadWriteType)); ReadWriteType* rwDest = reinterpret_cast(dest); SwapBytes(rwDest, isLittleEndian); } static void toBuffer(BufferPtrType unalignedBuffer, const DataType* src, bool isLittleEndian) { MOZ_ASSERT((reinterpret_cast(src) & alignMask) == 0); ReadWriteType temp = *reinterpret_cast(src); SwapBytes(&temp, isLittleEndian); Memcpy(unalignedBuffer, (uint8_t*)&temp, sizeof(ReadWriteType)); } }; template NativeType DataViewObject::read(uint64_t offset, bool isLittleEndian) { bool isSharedMemory; SharedMem data = getDataPointer(offset, &isSharedMemory); MOZ_ASSERT(data); NativeType val = 0; if (isSharedMemory) { DataViewIO>::fromBuffer(&val, data, isLittleEndian); } else { DataViewIO::fromBuffer(&val, data.unwrapUnshared(), isLittleEndian); } return val; } template uint32_t DataViewObject::read(uint64_t offset, bool isLittleEndian); // https://tc39.github.io/ecma262/#sec-getviewvalue // GetViewValue ( view, requestIndex, isLittleEndian, type ) template /* static */ bool DataViewObject::read(JSContext* cx, Handle obj, const CallArgs& args, NativeType* val) { // Step 1. done by the caller // Step 2. unnecessary assert // Step 3. uint64_t getIndex; if (!ToIndex(cx, args.get(0), &getIndex)) { return false; } // Step 4. bool isLittleEndian = args.length() >= 2 && ToBoolean(args[1]); // Steps 5-6. if (obj->hasDetachedBuffer()) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_DETACHED); return false; } // Steps 7-10. if (!obj->offsetIsInBounds(getIndex)) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_OFFSET_OUT_OF_DATAVIEW); return false; } // Steps 11-12. *val = obj->read(getIndex, isLittleEndian); return true; } template static inline T WrappingConvert(int32_t value) { if (std::is_unsigned_v) { return static_cast(value); } return WrapToSigned(static_cast>(value)); } template static inline bool WebIDLCast(JSContext* cx, HandleValue value, NativeType* out) { int32_t i; if (!ToInt32(cx, value, &i)) { return false; } *out = WrappingConvert(i); return true; } template <> inline bool WebIDLCast(JSContext* cx, HandleValue value, int64_t* out) { BigInt* bi = ToBigInt(cx, value); if (!bi) { return false; } *out = BigInt::toInt64(bi); return true; } template <> inline bool WebIDLCast(JSContext* cx, HandleValue value, uint64_t* out) { BigInt* bi = ToBigInt(cx, value); if (!bi) { return false; } *out = BigInt::toUint64(bi); return true; } template <> inline bool WebIDLCast(JSContext* cx, HandleValue value, float* out) { double temp; if (!ToNumber(cx, value, &temp)) { return false; } *out = static_cast(temp); return true; } template <> inline bool WebIDLCast(JSContext* cx, HandleValue value, double* out) { return ToNumber(cx, value, out); } // https://tc39.github.io/ecma262/#sec-setviewvalue // SetViewValue ( view, requestIndex, isLittleEndian, type, value ) template /* static */ bool DataViewObject::write(JSContext* cx, Handle obj, const CallArgs& args) { // Step 1. done by the caller // Step 2. unnecessary assert // Step 3. uint64_t getIndex; if (!ToIndex(cx, args.get(0), &getIndex)) { return false; } // Steps 4-5. Call ToBigInt(value) or ToNumber(value) depending on the type. NativeType value; if (!WebIDLCast(cx, args.get(1), &value)) { return false; } // See the comment in ElementSpecific::doubleToNative. if (js::SupportDifferentialTesting() && TypeIsFloatingPoint()) { value = JS::CanonicalizeNaN(value); } // Step 6. bool isLittleEndian = args.length() >= 3 && ToBoolean(args[2]); // Steps 7-8. if (obj->hasDetachedBuffer()) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_DETACHED); return false; } // Steps 9-12. if (!obj->offsetIsInBounds(getIndex)) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_OFFSET_OUT_OF_DATAVIEW); return false; } // Steps 13-14. bool isSharedMemory; SharedMem data = obj->getDataPointer(getIndex, &isSharedMemory); MOZ_ASSERT(data); if (isSharedMemory) { DataViewIO>::toBuffer(data, &value, isLittleEndian); } else { DataViewIO::toBuffer(data.unwrapUnshared(), &value, isLittleEndian); } return true; } bool DataViewObject::getInt8Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); int8_t val; if (!read(cx, thisView, args, &val)) { return false; } args.rval().setInt32(val); return true; } bool DataViewObject::fun_getInt8(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::getUint8Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); uint8_t val; if (!read(cx, thisView, args, &val)) { return false; } args.rval().setInt32(val); return true; } bool DataViewObject::fun_getUint8(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::getInt16Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); int16_t val; if (!read(cx, thisView, args, &val)) { return false; } args.rval().setInt32(val); return true; } bool DataViewObject::fun_getInt16(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::getUint16Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); uint16_t val; if (!read(cx, thisView, args, &val)) { return false; } args.rval().setInt32(val); return true; } bool DataViewObject::fun_getUint16(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::getInt32Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); int32_t val; if (!read(cx, thisView, args, &val)) { return false; } args.rval().setInt32(val); return true; } bool DataViewObject::fun_getInt32(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::getUint32Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); uint32_t val; if (!read(cx, thisView, args, &val)) { return false; } args.rval().setNumber(val); return true; } bool DataViewObject::fun_getUint32(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } // BigInt proposal 7.26 // DataView.prototype.getBigInt64 ( byteOffset [ , littleEndian ] ) bool DataViewObject::getBigInt64Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); int64_t val; if (!read(cx, thisView, args, &val)) { return false; } BigInt* bi = BigInt::createFromInt64(cx, val); if (!bi) { return false; } args.rval().setBigInt(bi); return true; } bool DataViewObject::fun_getBigInt64(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } // BigInt proposal 7.27 // DataView.prototype.getBigUint64 ( byteOffset [ , littleEndian ] ) bool DataViewObject::getBigUint64Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); int64_t val; if (!read(cx, thisView, args, &val)) { return false; } BigInt* bi = BigInt::createFromUint64(cx, val); if (!bi) { return false; } args.rval().setBigInt(bi); return true; } bool DataViewObject::fun_getBigUint64(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::getFloat32Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); float val; if (!read(cx, thisView, args, &val)) { return false; } args.rval().setDouble(CanonicalizeNaN(val)); return true; } bool DataViewObject::fun_getFloat32(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::getFloat64Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); double val; if (!read(cx, thisView, args, &val)) { return false; } args.rval().setDouble(CanonicalizeNaN(val)); return true; } bool DataViewObject::fun_getFloat64(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::setInt8Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); if (!write(cx, thisView, args)) { return false; } args.rval().setUndefined(); return true; } bool DataViewObject::fun_setInt8(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::setUint8Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); if (!write(cx, thisView, args)) { return false; } args.rval().setUndefined(); return true; } bool DataViewObject::fun_setUint8(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::setInt16Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); if (!write(cx, thisView, args)) { return false; } args.rval().setUndefined(); return true; } bool DataViewObject::fun_setInt16(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::setUint16Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); if (!write(cx, thisView, args)) { return false; } args.rval().setUndefined(); return true; } bool DataViewObject::fun_setUint16(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::setInt32Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); if (!write(cx, thisView, args)) { return false; } args.rval().setUndefined(); return true; } bool DataViewObject::fun_setInt32(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::setUint32Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); if (!write(cx, thisView, args)) { return false; } args.rval().setUndefined(); return true; } bool DataViewObject::fun_setUint32(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } // BigInt proposal 7.28 // DataView.prototype.setBigInt64 ( byteOffset, value [ , littleEndian ] ) bool DataViewObject::setBigInt64Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); if (!write(cx, thisView, args)) { return false; } args.rval().setUndefined(); return true; } bool DataViewObject::fun_setBigInt64(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } // BigInt proposal 7.29 // DataView.prototype.setBigUint64 ( byteOffset, value [ , littleEndian ] ) bool DataViewObject::setBigUint64Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); if (!write(cx, thisView, args)) { return false; } args.rval().setUndefined(); return true; } bool DataViewObject::fun_setBigUint64(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::setFloat32Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); if (!write(cx, thisView, args)) { return false; } args.rval().setUndefined(); return true; } bool DataViewObject::fun_setFloat32(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::setFloat64Impl(JSContext* cx, const CallArgs& args) { MOZ_ASSERT(is(args.thisv())); Rooted thisView( cx, &args.thisv().toObject().as()); if (!write(cx, thisView, args)) { return false; } args.rval().setUndefined(); return true; } bool DataViewObject::fun_setFloat64(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::bufferGetterImpl(JSContext* cx, const CallArgs& args) { Rooted thisView( cx, &args.thisv().toObject().as()); args.rval().set(thisView->bufferValue()); return true; } bool DataViewObject::bufferGetter(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::byteLengthGetterImpl(JSContext* cx, const CallArgs& args) { Rooted thisView( cx, &args.thisv().toObject().as()); // Step 6. if (thisView->hasDetachedBuffer()) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_DETACHED); return false; } // Step 7. args.rval().set(thisView->byteLengthValue()); return true; } bool DataViewObject::byteLengthGetter(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } bool DataViewObject::byteOffsetGetterImpl(JSContext* cx, const CallArgs& args) { Rooted thisView( cx, &args.thisv().toObject().as()); // Step 6. if (thisView->hasDetachedBuffer()) { JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_DETACHED); return false; } // Step 7. args.rval().set(thisView->byteOffsetValue()); return true; } bool DataViewObject::byteOffsetGetter(JSContext* cx, unsigned argc, Value* vp) { CallArgs args = CallArgsFromVp(argc, vp); return CallNonGenericMethod(cx, args); } static const JSClassOps DataViewObjectClassOps = { nullptr, // addProperty nullptr, // delProperty nullptr, // enumerate nullptr, // newEnumerate nullptr, // resolve nullptr, // mayResolve nullptr, // finalize nullptr, // call nullptr, // construct ArrayBufferViewObject::trace, // trace }; const ClassSpec DataViewObject::classSpec_ = { GenericCreateConstructor, GenericCreatePrototype, nullptr, nullptr, DataViewObject::methods, DataViewObject::properties}; const JSClass DataViewObject::class_ = { "DataView", JSCLASS_HAS_RESERVED_SLOTS(DataViewObject::RESERVED_SLOTS) | JSCLASS_HAS_CACHED_PROTO(JSProto_DataView), &DataViewObjectClassOps, &DataViewObject::classSpec_}; const JSClass* const JS::DataView::ClassPtr = &DataViewObject::class_; const JSClass DataViewObject::protoClass_ = { "DataView.prototype", JSCLASS_HAS_CACHED_PROTO(JSProto_DataView), JS_NULL_CLASS_OPS, &DataViewObject::classSpec_}; const JSFunctionSpec DataViewObject::methods[] = { JS_INLINABLE_FN("getInt8", DataViewObject::fun_getInt8, 1, 0, DataViewGetInt8), JS_INLINABLE_FN("getUint8", DataViewObject::fun_getUint8, 1, 0, DataViewGetUint8), JS_INLINABLE_FN("getInt16", DataViewObject::fun_getInt16, 1, 0, DataViewGetInt16), JS_INLINABLE_FN("getUint16", DataViewObject::fun_getUint16, 1, 0, DataViewGetUint16), JS_INLINABLE_FN("getInt32", DataViewObject::fun_getInt32, 1, 0, DataViewGetInt32), JS_INLINABLE_FN("getUint32", DataViewObject::fun_getUint32, 1, 0, DataViewGetUint32), JS_INLINABLE_FN("getFloat32", DataViewObject::fun_getFloat32, 1, 0, DataViewGetFloat32), JS_INLINABLE_FN("getFloat64", DataViewObject::fun_getFloat64, 1, 0, DataViewGetFloat64), JS_INLINABLE_FN("getBigInt64", DataViewObject::fun_getBigInt64, 1, 0, DataViewGetBigInt64), JS_INLINABLE_FN("getBigUint64", DataViewObject::fun_getBigUint64, 1, 0, DataViewGetBigUint64), JS_INLINABLE_FN("setInt8", DataViewObject::fun_setInt8, 2, 0, DataViewSetInt8), JS_INLINABLE_FN("setUint8", DataViewObject::fun_setUint8, 2, 0, DataViewSetUint8), JS_INLINABLE_FN("setInt16", DataViewObject::fun_setInt16, 2, 0, DataViewSetInt16), JS_INLINABLE_FN("setUint16", DataViewObject::fun_setUint16, 2, 0, DataViewSetUint16), JS_INLINABLE_FN("setInt32", DataViewObject::fun_setInt32, 2, 0, DataViewSetInt32), JS_INLINABLE_FN("setUint32", DataViewObject::fun_setUint32, 2, 0, DataViewSetUint32), JS_INLINABLE_FN("setFloat32", DataViewObject::fun_setFloat32, 2, 0, DataViewSetFloat32), JS_INLINABLE_FN("setFloat64", DataViewObject::fun_setFloat64, 2, 0, DataViewSetFloat64), JS_INLINABLE_FN("setBigInt64", DataViewObject::fun_setBigInt64, 2, 0, DataViewSetBigInt64), JS_INLINABLE_FN("setBigUint64", DataViewObject::fun_setBigUint64, 2, 0, DataViewSetBigUint64), JS_FS_END}; const JSPropertySpec DataViewObject::properties[] = { JS_PSG("buffer", DataViewObject::bufferGetter, 0), JS_PSG("byteLength", DataViewObject::byteLengthGetter, 0), JS_PSG("byteOffset", DataViewObject::byteOffsetGetter, 0), JS_STRING_SYM_PS(toStringTag, "DataView", JSPROP_READONLY), JS_PS_END}; JS_PUBLIC_API JSObject* JS_NewDataView(JSContext* cx, HandleObject buffer, size_t byteOffset, size_t byteLength) { JSProtoKey key = JSProto_DataView; RootedObject constructor(cx, GlobalObject::getOrCreateConstructor(cx, key)); if (!constructor) { return nullptr; } FixedConstructArgs<3> cargs(cx); cargs[0].setObject(*buffer); cargs[1].setNumber(byteOffset); cargs[2].setNumber(byteLength); RootedValue fun(cx, ObjectValue(*constructor)); RootedObject obj(cx); if (!Construct(cx, fun, cargs, fun, &obj)) { return nullptr; } return obj; }