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// jni-libjvm.cc - an implementation of the JNI invocation API.

/* Copyright (C) 2006  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the

Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for

details.  */

#include <gcj/cni.h>

#include <gcj/javaprims.h>

#include <java-assert.h>

#include <jvm.h>

#include <jni.h>

using namespace gcj;

// Forward declarations.

extern struct JNIInvokeInterface_ _Jv_JNI_InvokeFunctions;

extern jint JNICALL _Jv_JNI_AttachCurrentThread (JavaVM *vm,

                                                 void **penv, void *args);

extern JavaVM *_Jv_the_vm;

jint JNICALL

JNI_GetDefaultJavaVMInitArgs (void *args)

{

  jint version = * (jint *) args;

  // Here we only support 1.2 and 1.4.

  if (version != JNI_VERSION_1_2 && version != JNI_VERSION_1_4)

    return JNI_EVERSION;

  JavaVMInitArgs *ia = reinterpret_cast<JavaVMInitArgs *> (args);

  ia->version = JNI_VERSION_1_4;

  ia->nOptions = 0;

  ia->options = NULL;

  ia->ignoreUnrecognized = true;

  return 0;

}

jint JNICALL

JNI_CreateJavaVM (JavaVM **vm, void **penv, void *args)

{

  JvAssert (! _Jv_the_vm);

  jint version = * (jint *) args;

  // We only support 1.2 and 1.4.

  if (version != JNI_VERSION_1_2 && version != JNI_VERSION_1_4)

    return JNI_EVERSION;

  JvVMInitArgs* vm_args = reinterpret_cast<JvVMInitArgs *> (args);

  jint result = _Jv_CreateJavaVM (vm_args);

  if (result)

    return result;

  // FIXME: synchronize

  JavaVM *nvm = (JavaVM *) _Jv_MallocUnchecked (sizeof (JavaVM));

  if (nvm == NULL)

    return JNI_ERR;

  nvm->functions = &_Jv_JNI_InvokeFunctions;

  jint r =_Jv_JNI_AttachCurrentThread (nvm, penv, NULL);

  if (r < 0)

    return r;

  _Jv_the_vm = nvm;

  *vm = _Jv_the_vm;

  return 0;

}

jint JNICALL

JNI_GetCreatedJavaVMs (JavaVM **vm_buffer, jsize buf_len, jsize *n_vms)

{

  if (buf_len <= 0)

    return JNI_ERR;

  // We only support a single VM.

  if (_Jv_the_vm != NULL)

    {

      vm_buffer[0] = _Jv_the_vm;

      *n_vms = 1;

    }

  else

    *n_vms = 0;

  return 0;

}