gecko/js/ctypes/Function.h

/* -*-  Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is js-ctypes.
 *
 * The Initial Developer of the Original Code is
 * The Mozilla Foundation <http://www.mozilla.org/>.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Mark Finkle <mark.finkle@gmail.com>, <mfinkle@mozilla.com>
 *  Dan Witte <dwitte@mozilla.com>
 *
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 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#ifndef FUNCTION_H
#define FUNCTION_H

#include "CTypes.h"
#include "nsTArray.h"
#include "prlink.h"

namespace mozilla {
namespace ctypes {

enum FunctionSlot
{
  SLOT_FUNCTION = 0,
  SLOT_LIBRARYOBJ = 1
  // JSFunction objects always get exactly two slots.
};

struct Type
{
  ffi_type mFFIType;
  JSObject* mType;
};

struct AutoValue
{
  AutoValue() : mData(NULL) { }

  ~AutoValue()
  {
    delete[] static_cast<char*>(mData);
  }

  bool SizeToType(JSContext* cx, JSObject* type)
  {
    size_t size = CType::GetSize(cx, type);
    mData = new char[size];
    if (mData)
      memset(mData, 0, size);
    return mData != NULL;
  }

  void* mData;
};

class Function
{
public:
  Function();

  Function*& Next() { return mNext; }
  void Trace(JSTracer *trc);

  static JSObject* Create(JSContext* aContext, JSObject* aLibrary, PRFuncPtr aFunc, const char* aName, jsval aCallType, jsval aResultType, jsval* aArgTypes, uintN aArgLength);
  static JSBool Call(JSContext* cx, uintN argc, jsval* vp);

  ~Function();

private:
  JSBool Init(JSContext* aContext, PRFuncPtr aFunc, jsval aCallType, jsval aResultType, jsval* aArgTypes, uintN aArgLength);
  JSBool Execute(JSContext* cx, PRUint32 argc, jsval* vp);

protected:
  PRFuncPtr mFunc;

  ffi_abi mCallType;
  Type mResultType;
  nsAutoTArray<Type, 16> mArgTypes;
  nsAutoTArray<ffi_type*, 16> mFFITypes;

  ffi_cif mCIF;

  Function* mNext;
};

}
}

#endif