libjava/gnu/java/lang/natMainThread.cc

   1 // natMainThread.cc - Implementation of MainThread native methods.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2003, 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 <config.h>
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15
  16 #include <gcj/cni.h>
  17 #include <jvm.h>
  18 #include <java-threads.h>
  19
  20 #include <gnu/java/lang/MainThread.h>
  21 #include <java/lang/Runtime.h>
  22 #include <java/lang/ThreadGroup.h>
  23
  24 typedef void main_func (jobject);
  25
  26 void
  27 gnu::java::lang::MainThread::call_main (void)
  28 {
  29   Utf8Const* main_signature = _Jv_makeUtf8Const ("([Ljava.lang.String;)V", 22);
  30   Utf8Const* main_name = _Jv_makeUtf8Const ("main", 4);
  31
  32   _Jv_Method *meth = _Jv_LookupDeclaredMethod (klass, main_name,
  33                                                main_signature);
  34
  35   // Some checks from Java Spec section 12.1.4.
  36   const char *msg = NULL;
  37   if (meth == NULL)
  38     msg = "no suitable method `main' in class";
  39   else if (! ::java::lang::reflect::Modifier::isStatic(meth->accflags))
  40     msg = "`main' must be static";
  41   else if (! ::java::lang::reflect::Modifier::isPublic(meth->accflags))
  42     msg =  "`main' must be public";
  43   if (msg != NULL)
  44     {
  45       fprintf (stderr, "%s\n", msg);
  46       ::exit(1);
  47     }
  48
  49   main_func *real_main = (main_func *) meth->ncode;
  50   (*real_main) (args);
  51
  52   // Note that we do thread cleanup here.  We have to do this here and
  53   // not in _Jv_RunMain; if we do if after the main thread has exited,
  54   // our ThreadGroup will be null, and if Runtime.exit tries to create
  55   // a new Thread (which it does when running shutdown hooks), it will
  56   // eventually NPE due to this.
  57   _Jv_ThreadWait ();
  58
  59   int status = (int) ::java::lang::ThreadGroup::had_uncaught_exception;
  60   ::java::lang::Runtime *runtime = ::java::lang::Runtime::getRuntime ();
  61   runtime->exit (status);
  62 }