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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * 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 "gc/Barrier.h"
#include "js/Class.h"
#include "vm/ArrayBufferObject.h"
#include "vm/JSObject.h"
#include "vm/SharedArrayObject.h"
#include "vm/TypedArrayObject.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 NativeObject {
 private:
  static const Class protoClass_;
  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>
  static SharedMem<uint8_t*> getDataPointer(JSContext* cx,
                                            Handle<DataViewObject*> obj,
                                            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,
                                         uint32_t* byteOffset,
                                         uint32_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, uint32_t byteOffset, uint32_t byteLength,
      Handle<ArrayBufferObjectMaybeShared*> arrayBuffer, HandleObject proto);

 public:
  static const Class class_;

  static Value byteOffsetValue(DataViewObject* view) {
    Value v = view->getFixedSlot(TypedArrayObject::BYTEOFFSET_SLOT);
    MOZ_ASSERT(v.toInt32() >= 0);
    return v;
  }

  static Value byteLengthValue(DataViewObject* view) {
    Value v = view->getFixedSlot(TypedArrayObject::LENGTH_SLOT);
    MOZ_ASSERT(v.toInt32() >= 0);
    return v;
  }

  static Value bufferValue(DataViewObject* view) {
    return view->getFixedSlot(TypedArrayObject::BUFFER_SLOT);
  }

  uint32_t byteOffset() const {
    return byteOffsetValue(const_cast<DataViewObject*>(this)).toInt32();
  }

  uint32_t byteLength() const {
    return byteLengthValue(const_cast<DataViewObject*>(this)).toInt32();
  }

  ArrayBufferObjectMaybeShared& arrayBufferEither() const {
    return bufferValue(const_cast<DataViewObject*>(this))
        .toObject()
        .as<ArrayBufferObjectMaybeShared>();
  }

  SharedMem<void*> dataPointerEither() const {
    void* p = getPrivate();
    if (isSharedMemory()) return SharedMem<void*>::shared(p);
    return SharedMem<void*>::unshared(p);
  }

  void* dataPointerUnshared() const {
    MOZ_ASSERT(!isSharedMemory());
    return getPrivate();
  }

  void* dataPointerShared() const {
    MOZ_ASSERT(isSharedMemory());
    return getPrivate();
  }

  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 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 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);

  static bool initClass(JSContext* cx);
  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);

  void notifyBufferDetached(void* newData);

 private:
  static const JSFunctionSpec methods[];
  static const JSPropertySpec properties[];
};

}  // namespace js

#endif /* vm_DataViewObject_h */