gecko/js/ctypes/Function.h

/* -*-  Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * 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>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * 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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 * the provisions above, a recipient may use your version of this file under
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 * ***** END LICENSE BLOCK ***** */

#ifndef FUNCTION_H
#define FUNCTION_H

#include "Module.h"
#include "nsTArray.h"
#include "prlink.h"
#include "ffi.h"

namespace mozilla {
namespace ctypes {

// for JS error reporting
enum ErrorNum {
#define MSG_DEF(name, number, count, exception, format) \
  name = number,
#include "ctypes.msg"
#undef MSG_DEF
  CTYPESERR_LIMIT
};

const JSErrorFormatString*
GetErrorMessage(void* userRef, const char* locale, const uintN errorNumber);

struct Type
{
  ffi_type mFFIType;
  TypeCode mType;
};

struct Value
{
  void* mData;
  union {
    PRInt8   mInt8;
    PRInt16  mInt16;
    PRInt32  mInt32;
    PRInt64  mInt64;
    PRUint8  mUint8;
    PRUint16 mUint16;
    PRUint32 mUint32;
    PRUint64 mUint64;
    float    mFloat;
    double   mDouble;
    void*    mPointer;
  } mValue;
};

class Function
{
public:
  Function();

  Function*& Next() { return mNext; }

  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:
  bool Init(JSContext* aContext, PRFuncPtr aFunc, jsval aCallType, jsval aResultType, jsval* aArgTypes, uintN aArgLength);
  bool 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