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Diffstat (limited to 'js/src/builtin/DataViewObject.h')
| -rw-r--r-- | js/src/builtin/DataViewObject.h | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/js/src/builtin/DataViewObject.h b/js/src/builtin/DataViewObject.h new file mode 100644 index 0000000000..83a24cf29b --- /dev/null +++ b/js/src/builtin/DataViewObject.h @@ -0,0 +1,169 @@ +/* -*- 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/. */ + +#ifndef vm_DataViewObject_h +#define vm_DataViewObject_h + +#include "mozilla/CheckedInt.h" + +#include "js/Class.h" +#include "vm/ArrayBufferViewObject.h" +#include "vm/JSObject.h" + +namespace js { + +class ArrayBufferObjectMaybeShared; + +// In the DataViewObject, the private slot contains a raw pointer into +// the buffer. The buffer may be shared memory and the raw pointer +// should not be exposed without sharedness information accompanying +// it. + +class DataViewObject : public ArrayBufferViewObject { + private: + static const ClassSpec classSpec_; + + static bool is(HandleValue v) { + return v.isObject() && v.toObject().hasClass(&class_); + } + + template <typename NativeType> + SharedMem<uint8_t*> getDataPointer(uint64_t offset, bool* isSharedMemory); + + static bool bufferGetterImpl(JSContext* cx, const CallArgs& args); + static bool bufferGetter(JSContext* cx, unsigned argc, Value* vp); + + static bool byteLengthGetterImpl(JSContext* cx, const CallArgs& args); + static bool byteLengthGetter(JSContext* cx, unsigned argc, Value* vp); + + static bool byteOffsetGetterImpl(JSContext* cx, const CallArgs& args); + static bool byteOffsetGetter(JSContext* cx, unsigned argc, Value* vp); + + static bool getAndCheckConstructorArgs(JSContext* cx, HandleObject bufobj, + const CallArgs& args, + size_t* byteOffset, + size_t* byteLength); + static bool constructSameCompartment(JSContext* cx, HandleObject bufobj, + const CallArgs& args); + static bool constructWrapped(JSContext* cx, HandleObject bufobj, + const CallArgs& args); + + static DataViewObject* create( + JSContext* cx, size_t byteOffset, size_t byteLength, + Handle<ArrayBufferObjectMaybeShared*> arrayBuffer, HandleObject proto); + + public: + static const JSClass class_; + static const JSClass protoClass_; + + size_t byteLength() const { + return size_t(getFixedSlot(LENGTH_SLOT).toPrivate()); + } + + Value byteLengthValue() const { + size_t len = byteLength(); + return NumberValue(len); + } + + template <typename NativeType> + bool offsetIsInBounds(uint64_t offset) const { + return offsetIsInBounds(sizeof(NativeType), offset); + } + bool offsetIsInBounds(uint32_t byteSize, uint64_t offset) const { + MOZ_ASSERT(byteSize <= 8); + mozilla::CheckedInt<uint64_t> endOffset(offset); + endOffset += byteSize; + return endOffset.isValid() && endOffset.value() <= byteLength(); + } + + static bool isOriginalByteOffsetGetter(Native native) { + return native == byteOffsetGetter; + } + + static bool isOriginalByteLengthGetter(Native native) { + return native == byteLengthGetter; + } + + static bool construct(JSContext* cx, unsigned argc, Value* vp); + + static bool getInt8Impl(JSContext* cx, const CallArgs& args); + static bool fun_getInt8(JSContext* cx, unsigned argc, Value* vp); + + static bool getUint8Impl(JSContext* cx, const CallArgs& args); + static bool fun_getUint8(JSContext* cx, unsigned argc, Value* vp); + + static bool getInt16Impl(JSContext* cx, const CallArgs& args); + static bool fun_getInt16(JSContext* cx, unsigned argc, Value* vp); + + static bool getUint16Impl(JSContext* cx, const CallArgs& args); + static bool fun_getUint16(JSContext* cx, unsigned argc, Value* vp); + + static bool getInt32Impl(JSContext* cx, const CallArgs& args); + static bool fun_getInt32(JSContext* cx, unsigned argc, Value* vp); + + static bool getUint32Impl(JSContext* cx, const CallArgs& args); + static bool fun_getUint32(JSContext* cx, unsigned argc, Value* vp); + + static bool getBigInt64Impl(JSContext* cx, const CallArgs& args); + static bool fun_getBigInt64(JSContext* cx, unsigned argc, Value* vp); + + static bool getBigUint64Impl(JSContext* cx, const CallArgs& args); + static bool fun_getBigUint64(JSContext* cx, unsigned argc, Value* vp); + + static bool getFloat32Impl(JSContext* cx, const CallArgs& args); + static bool fun_getFloat32(JSContext* cx, unsigned argc, Value* vp); + + static bool getFloat64Impl(JSContext* cx, const CallArgs& args); + static bool fun_getFloat64(JSContext* cx, unsigned argc, Value* vp); + + static bool setInt8Impl(JSContext* cx, const CallArgs& args); + static bool fun_setInt8(JSContext* cx, unsigned argc, Value* vp); + + static bool setUint8Impl(JSContext* cx, const CallArgs& args); + static bool fun_setUint8(JSContext* cx, unsigned argc, Value* vp); + + static bool setInt16Impl(JSContext* cx, const CallArgs& args); + static bool fun_setInt16(JSContext* cx, unsigned argc, Value* vp); + + static bool setUint16Impl(JSContext* cx, const CallArgs& args); + static bool fun_setUint16(JSContext* cx, unsigned argc, Value* vp); + + static bool setInt32Impl(JSContext* cx, const CallArgs& args); + static bool fun_setInt32(JSContext* cx, unsigned argc, Value* vp); + + static bool setUint32Impl(JSContext* cx, const CallArgs& args); + static bool fun_setUint32(JSContext* cx, unsigned argc, Value* vp); + + static bool setBigInt64Impl(JSContext* cx, const CallArgs& args); + static bool fun_setBigInt64(JSContext* cx, unsigned argc, Value* vp); + + static bool setBigUint64Impl(JSContext* cx, const CallArgs& args); + static bool fun_setBigUint64(JSContext* cx, unsigned argc, Value* vp); + + static bool setFloat32Impl(JSContext* cx, const CallArgs& args); + static bool fun_setFloat32(JSContext* cx, unsigned argc, Value* vp); + + static bool setFloat64Impl(JSContext* cx, const CallArgs& args); + static bool fun_setFloat64(JSContext* cx, unsigned argc, Value* vp); + + template <typename NativeType> + NativeType read(uint64_t offset, bool isLittleEndian); + + template <typename NativeType> + static bool read(JSContext* cx, Handle<DataViewObject*> obj, + const CallArgs& args, NativeType* val); + template <typename NativeType> + static bool write(JSContext* cx, Handle<DataViewObject*> obj, + const CallArgs& args); + + private: + static const JSFunctionSpec methods[]; + static const JSPropertySpec properties[]; +}; + +} // namespace js + +#endif /* vm_DataViewObject_h */ |