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#include <jni.h>

#include <jvmti.h>

#include <stdio.h>

#include <stdlib.h>

#include "getargssize.h"

JNIEXPORT jint JNICALL Java_getargssize_do_1getargssize_1tests

(JNIEnv *env, jclass klass)

{

  JavaVM *vm;

  jint err = env->GetJavaVM (&vm);

  if (err < 0)

    {

      fprintf (stderr, "error getting VM\n");

      exit (1);

    }

  jvmtiEnv *jvmti = NULL;

  vm->GetEnv ((void **) &jvmti, JVMTI_VERSION_1_0);

  if (jvmti == NULL)

    {

      fprintf (stderr, "error getting jvmti environment\n");

      exit (1);

    }

  jint args_size;

  jvmtiError jerr;

  jmethodID meth_ids[4];

  meth_ids[0] = env->GetMethodID (klass, "aMethod", "(FI)I");

  meth_ids[1] = env->GetMethodID (klass, "bMethod", "(JDI)J");

  meth_ids[2] = env->GetStaticMethodID (klass, "cMethod", "()Z");

  meth_ids[3] = env->GetStaticMethodID (klass, "dMethod",

                                     "(Ljava/lang/Object;)Ljava/lang/Object;");

  for (int i = 0; i < 4; i++)

    {

      jerr = jvmti->GetArgumentsSize (meth_ids[i], &args_size);

      if (jerr != JVMTI_ERROR_NONE)

        {

          char *error_name;

          jvmti->GetErrorName (jerr, &error_name);

          fprintf (stderr, "JVMTI Error: %s\n", error_name);

          jvmti->Deallocate (reinterpret_cast<unsigned char *> (error_name));

        }

      else

        {

          printf ("Method %d requires %d slots for its arguments\n", i,

                  args_size);

        }

    }

    return 0;

}