1 files changed, 173 insertions, 0 deletions
diff --git a/js/src/builtin/DataViewObject.h b/js/src/builtin/DataViewObject.h
new file mode 100644
index 0000000000..1e77f0b464
--- /dev/null
+++ b/js/src/builtin/DataViewObject.h
@@ -0,0 +1,173 @@
+/* -*- 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/Attributes.h"
+#include "mozilla/CheckedInt.h"
+
+#include "gc/Barrier.h"
+#include "js/Class.h"
+#include "vm/ArrayBufferObject.h"
+#include "vm/ArrayBufferViewObject.h"
+#include "vm/JSObject.h"
+#include "vm/SharedArrayObject.h"
+
+namespace js {
+
+// 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 JSObject* CreatePrototype(JSContext* cx, JSProtoKey key);
+
+  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,
+                                         BufferSize* byteOffset,
+                                         BufferSize* 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, BufferSize byteOffset, BufferSize byteLength,
+      Handle<ArrayBufferObjectMaybeShared*> arrayBuffer, HandleObject proto);
+
+ public:
+  static const JSClass class_;
+  static const JSClass protoClass_;
+
+  BufferSize byteLength() const {
+    return BufferSize(size_t(getFixedSlot(LENGTH_SLOT).toPrivate()));
+  }
+
+  Value byteLengthValue() const {
+    size_t len = byteLength().get();
+    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().get();
+  }
+
+  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 */