libjava/jni-libjvm.cc

   1 // jni-libjvm.cc - an implementation of the JNI invocation API.
   2
   3 /* Copyright (C) 2006  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #include <gcj/cni.h>
  12 #include <gcj/javaprims.h>
  13 #include <java-assert.h>
  14 #include <jvm.h>
  15 #include <jni.h>
  16
  17 using namespace gcj;
  18
  19 // Forward declarations.
  20 extern struct JNIInvokeInterface_ _Jv_JNI_InvokeFunctions;
  21 extern jint JNICALL _Jv_JNI_AttachCurrentThread (JavaVM *vm,
  22                                                  void **penv, void *args);
  23 extern JavaVM *_Jv_the_vm;
  24
  25 jint JNICALL
  26 JNI_GetDefaultJavaVMInitArgs (void *args)
  27 {
  28   jint version = * (jint *) args;
  29   // Here we only support 1.2 and 1.4.
  30   if (version != JNI_VERSION_1_2 && version != JNI_VERSION_1_4)
  31     return JNI_EVERSION;
  32
  33   JavaVMInitArgs *ia = reinterpret_cast<JavaVMInitArgs *> (args);
  34   ia->version = JNI_VERSION_1_4;
  35   ia->nOptions = 0;
  36   ia->options = NULL;
  37   ia->ignoreUnrecognized = true;
  38
  39   return 0;
  40 }
  41
  42 jint JNICALL
  43 JNI_CreateJavaVM (JavaVM **vm, void **penv, void *args)
  44 {
  45   JvAssert (! _Jv_the_vm);
  46
  47   jint version = * (jint *) args;
  48   // We only support 1.2 and 1.4.
  49   if (version != JNI_VERSION_1_2 && version != JNI_VERSION_1_4)
  50     return JNI_EVERSION;
  51
  52   JvVMInitArgs* vm_args = reinterpret_cast<JvVMInitArgs *> (args);
  53
  54   jint result = _Jv_CreateJavaVM (vm_args);
  55   if (result)
  56     return result;
  57
  58   // FIXME: synchronize
  59   JavaVM *nvm = (JavaVM *) _Jv_MallocUnchecked (sizeof (JavaVM));
  60   if (nvm == NULL)
  61     return JNI_ERR;
  62   nvm->functions = &_Jv_JNI_InvokeFunctions;
  63
  64   jint r =_Jv_JNI_AttachCurrentThread (nvm, penv, NULL);
  65   if (r < 0)
  66     return r;
  67
  68   _Jv_the_vm = nvm;
  69   *vm = _Jv_the_vm;
  70
  71   return 0;
  72 }
  73
  74 jint JNICALL
  75 JNI_GetCreatedJavaVMs (JavaVM **vm_buffer, jsize buf_len, jsize *n_vms)
  76 {
  77   if (buf_len <= 0)
  78     return JNI_ERR;
  79
  80   // We only support a single VM.
  81   if (_Jv_the_vm != NULL)
  82     {
  83       vm_buffer[0] = _Jv_the_vm;
  84       *n_vms = 1;
  85     }
  86   else
  87     *n_vms = 0;
  88   return 0;
  89 }