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/* jcl.c

   Copyright (C) 1998, 2005, 2006, 2008 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

/* do not move; needed here because of some macro definitions */

#include "config.h"

#include <stdlib.h>

#include <stdio.h>

#include <jcl.h>

#ifndef __GNUC__

  #ifndef __attribute__

    #define __attribute__(x)    /* nothing */

  #endif

#endif

/*

 * Cached Pointer class info.

 */

static jclass rawDataClass = NULL;

static jfieldID rawData_fid = NULL;

static jmethodID rawData_mid = NULL;

/*

 * JNI OnLoad constructor.

 */

JNIEXPORT jint JNICALL

JNI_OnLoad (JavaVM *vm, void *reserved __attribute__((unused)))

{

  JNIEnv *env;

  void *envp;

  if ((*vm)->GetEnv (vm, &envp, JNI_VERSION_1_4) != JNI_OK)

    {

      return JNI_VERSION_1_4;

    }

  env = (JNIEnv *) envp;

#if SIZEOF_VOID_P == 8

  rawDataClass = (*env)->FindClass (env, "gnu/classpath/Pointer64");

  if (rawDataClass != NULL)

    rawDataClass = (*env)->NewGlobalRef (env, rawDataClass);

  if (rawDataClass != NULL)

    {

      rawData_fid = (*env)->GetFieldID (env, rawDataClass, "data", "J");

      rawData_mid = (*env)->GetMethodID (env, rawDataClass, "<init>", "(J)V");

    }

#else

#if SIZEOF_VOID_P == 4

  rawDataClass = (*env)->FindClass (env, "gnu/classpath/Pointer32");

  if (rawDataClass != NULL)

    rawDataClass = (*env)->NewGlobalRef (env, rawDataClass);

  if (rawDataClass != NULL)

    {

      rawData_fid = (*env)->GetFieldID (env, rawDataClass, "data", "I");

      rawData_mid = (*env)->GetMethodID (env, rawDataClass, "<init>", "(I)V");

    }

#else

#error "Pointer size is not supported."

#endif /* SIZEOF_VOID_P == 4 */

#endif /* SIZEOF_VOID_P == 8 */

  return JNI_VERSION_1_4;

}

JNIEXPORT void JNICALL

JCL_ThrowException (JNIEnv * env, const char *className, const char *errMsg)

{

  jclass excClass;

  if ((*env)->ExceptionOccurred (env))

    {

      (*env)->ExceptionClear (env);

    }

  excClass = (*env)->FindClass (env, className);

  if (excClass == NULL)

    {

      jclass errExcClass;

      errExcClass =

        (*env)->FindClass (env, "java/lang/ClassNotFoundException");

      if (errExcClass == NULL)

        {

          errExcClass = (*env)->FindClass (env, "java/lang/InternalError");

          if (errExcClass == NULL)

            {

              fprintf (stderr, "JCL: Utterly failed to throw exeption ");

              fprintf (stderr, "%s", className);

              fprintf (stderr, " with message ");

              fprintf (stderr, "%s", errMsg);

              return;

            }

        }

      /* Removed this (more comprehensive) error string to avoid the need for

       * a static variable or allocation of a buffer for this message in this

       * (unlikely) error case. --Fridi.

       *

       * sprintf(errstr,"JCL: Failed to throw exception %s with message %s: could not find exception class.", className, errMsg);

       */

      (*env)->ThrowNew (env, errExcClass, className);

    }

  (*env)->ThrowNew (env, excClass, errMsg);

}

JNIEXPORT void *JNICALL

JCL_malloc (JNIEnv * env, size_t size)

{

  void *mem = malloc (size);

  if (mem == NULL)

    {

      JCL_ThrowException (env, "java/lang/OutOfMemoryError",

                          "malloc() failed.");

      return NULL;

    }

  return mem;

}

JNIEXPORT void *JNICALL

JCL_realloc (JNIEnv * env, void *ptr, size_t size)

{

  void *orig_ptr = ptr;

  ptr = realloc (ptr, size);

  if (ptr == 0)

    {

      free (orig_ptr);

      JCL_ThrowException (env, "java/lang/OutOfMemoryError",

                          "malloc() failed.");

      return NULL;

    }

  return (ptr);

}

JNIEXPORT void JNICALL

JCL_free (JNIEnv * env __attribute__ ((unused)), void *p)

{

  if (p != NULL)

    {

      free (p);

    }

}

JNIEXPORT const char *JNICALL

JCL_jstring_to_cstring (JNIEnv * env, jstring s)

{

  const char *cstr;

  if (s == NULL)

    {

      JCL_ThrowException (env, "java/lang/NullPointerException",

                          "Null string");

      return NULL;

    }

  cstr = (const char *) (*env)->GetStringUTFChars (env, s, NULL);

  if (cstr == NULL)

    {

      JCL_ThrowException (env, "java/lang/InternalError",

                          "GetStringUTFChars() failed.");

      return NULL;

    }

  return cstr;

}

JNIEXPORT void JNICALL

JCL_free_cstring (JNIEnv * env, jstring s, const char *cstr)

{

  (*env)->ReleaseStringUTFChars (env, s, cstr);

}

JNIEXPORT jint JNICALL

JCL_MonitorEnter (JNIEnv * env, jobject o)

{

  jint retval = (*env)->MonitorEnter (env, o);

  if (retval != 0)

    {

      JCL_ThrowException (env, "java/lang/InternalError",

                          "MonitorEnter() failed.");

    }

  return retval;

}

JNIEXPORT jint JNICALL

JCL_MonitorExit (JNIEnv * env, jobject o)

{

  jint retval = (*env)->MonitorExit (env, o);

  if (retval != 0)

    {

      JCL_ThrowException (env, "java/lang/InternalError",

                          "MonitorExit() failed.");

    }

  return retval;

}

JNIEXPORT jclass JNICALL

JCL_FindClass (JNIEnv * env, const char *className)

{

  jclass retval = (*env)->FindClass (env, className);

  if (retval == NULL)

    {

      JCL_ThrowException (env, "java/lang/ClassNotFoundException", className);

    }

  return retval;

}

/*

 * Build a Pointer object.

 */

JNIEXPORT jobject JNICALL

JCL_NewRawDataObject (JNIEnv * env, void *data)

{

  if (rawDataClass == NULL || rawData_mid == NULL)

    {

      JCL_ThrowException (env, "java/lang/InternalError",

                          "Pointer class was not properly initialized");

      return NULL;

    }

#if SIZEOF_VOID_P == 8

  return (*env)->NewObject (env, rawDataClass, rawData_mid, (jlong) data);

#else

  return (*env)->NewObject (env, rawDataClass, rawData_mid, (jint) data);

#endif

}

JNIEXPORT void * JNICALL

JCL_GetRawData (JNIEnv * env, jobject rawdata)

{

  if (rawData_fid == NULL)

    {

      JCL_ThrowException (env, "java/lang/InternalError",

                          "Pointer class was not properly initialized");

      return NULL;

    }

#if SIZEOF_VOID_P == 8

  return (void *) (*env)->GetLongField (env, rawdata, rawData_fid);

#else

  return (void *) (*env)->GetIntField (env, rawdata, rawData_fid);

#endif  

}