java/7066: gcj generates invalid bytecode for inner classes

Tue Jun 18 07:51:00 GMT 2002

>Number:         7066
>Category:       java
>Synopsis:       gcj generates invalid bytecode for an inner class
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 18 06:16:02 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Bruno Haible
>Release:        3.1
>Organization:
GNU hackers
>Environment:
System: Linux linuix 2.4.18-4GB #1 Wed Mar 27 13:57:05 UTC 2002 i686 un=
known
Architecture: i686

       =20
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: /packages2/gcc-3.1/configure --prefix=3D/packages/gnu-=
snapshot --enable-shared --enable-version-specific-runtime-libs --enabl=
e-nls
>Description:

gcj 3.1 generates invalid bytecode for the following program.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D GetURL.java =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
import java.io.*;
import java.net.*;

public class GetURL {
  private static long timeout =3D 30*1000;
  private boolean done;
  private Thread timeoutThread;
  public void fetch (String s) {
    URL url;
    try {
      url =3D new URL(s);
    } catch (MalformedURLException e) {
      System.exit(1);
      return;
    }
    System.err.print("Retrieving "+s+"...");
    System.err.flush();
    done =3D false;
    timeoutThread =3D
      new Thread() {
        public void run () {
          try {
            sleep(timeout);
            if (!done) {
              System.err.println(" timed out.");
              System.exit(1);
            }
          } catch (InterruptedException e) {
          }
        }
      };
    timeoutThread.start();
    try {
      InputStream istream =3D new BufferedInputStream(url.openStream())=
;
      OutputStream ostream =3D new BufferedOutputStream(System.out);
      for (;;) {
        int b =3D istream.read();
        if (b < 0) break;
        ostream.write(b);
      }
      ostream.close();
      System.out.flush();
      istream.close();
    } catch (IOException e) {
      System.err.println(" failed.");
      System.exit(1);
    }
    done =3D true;
    System.err.println(" done.");
  }
  public static void main (String[] args) {
    if (args.length !=3D 1)
      System.exit(1);
    (new GetURL()).fetch(args[0]);
    System.exit(0);
  }
}
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D

>How-To-Repeat:

Save the above snippet as GetURL.java. Then
$ gcj --version
gcj (GCC) 3.1
Copyright =A9 2002 Free Software Foundation, Inc.
Ce logiciel est libre; voir les sources pour les conditions de copie.  =
Il n'y a PAS
GARANTIE; ni implicite pour le MARCHANDAGE ou pour un BUT PARTICULIER.

$ gcj -C -d . GetURL.java=20

$ someurl=3D"http://localhost/" # or some other accessible URL

$ gij --version
gij (GNU libgcj) version 3.1

Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is=
 NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURP=
OSE.

$ CLASSPATH=3D. gij GetURL $someurl
Retrieving http://localhost/...Exception in thread "main" java.lang.Int=
ernalError: Thread.start called but threads not available
   at 0x4025f270: java.lang.Throwable.Throwable(java.lang.String) (/pac=
kages/gnu-snapshot/lib/libgcj.so.3)
   at 0x4024dcf6: java.lang.Error.Error(java.lang.String) (/packages/gn=
u-snapshot/lib/libgcj.so.3)
   at 0x4025f606: java.lang.VirtualMachineError.VirtualMachineError(jav=
a.lang.String) (/packages/gnu-snapshot/lib/libgcj.so.3)
   at 0x4024ff06: java.lang.InternalError.InternalError(java.lang.Strin=
g) (/packages/gnu-snapshot/lib/libgcj.so.3)
   at 0x403cc038: _Jv_ThreadStart(java.lang.Thread, int, void ()(java.l=
ang.Thread)) (/packages/gnu-snapshot/lib/libgcj.so.3)
   at 0x40240aa1: java.lang.Thread.start() (/packages/gnu-snapshot/lib/=
libgcj.so.3)
   at 0x403db0f7: ffi_call_SYSV (/packages/gnu-snapshot/lib/libgcj.so.3=
)
   at 0x403db0a7: ffi_raw_call (/packages/gnu-snapshot/lib/libgcj.so.3)=

   at 0x40231048: _Jv_InterpMethod.continue1(_Jv_InterpMethodInvocation=
) (/packages/gnu-snapshot/lib/libgcj.so.3)
   at 0x403e60a4: _Jv_InterpMethod.run(ffi_cif, void, ffi_raw, _Jv_Inte=
rpMethodInvocation) (/packages/gnu-snapshot/lib/libgcj.so.3)
   at 0x4022ee14: _Jv_InterpMethod.run_normal(ffi_cif, void, ffi_raw, v=
oid) (/packages/gnu-snapshot/lib/libgcj.so.3)
   at 0x403daf5c: ?? (??:0)
   at 0x403db0f7: ffi_call_SYSV (/packages/gnu-snapshot/lib/libgcj.so.3=
)
   at 0x403db0a7: ffi_raw_call (/packages/gnu-snapshot/lib/libgcj.so.3)=

   at 0x40231048: _Jv_InterpMethod.continue1(_Jv_InterpMethodInvocation=
) (/packages/gnu-snapshot/lib/libgcj.so.3)
   at 0x403e60a4: _Jv_InterpMethod.run(ffi_cif, void, ffi_raw, _Jv_Inte=
rpMethodInvocation) (/packages/gnu-snapshot/lib/libgcj.so.3)
   at 0x4022ee14: _Jv_InterpMethod.run_normal(ffi_cif, void, ffi_raw, v=
oid) (/packages/gnu-snapshot/lib/libgcj.so.3)
   at 0x403daf5c: ?? (??:0)
   at 0x40235258: gnu.gcj.runtime.FirstThread.call_main() (/packages/gn=
u-snapshot/lib/libgcj.so.3)
   at 0x402bde78: gnu.gcj.runtime.FirstThread.run() (/packages/gnu-snap=
shot/lib/libgcj.so.3)
   at 0x40240a0c: _Jv_ThreadRun(java.lang.Thread) (/packages/gnu-snapsh=
ot/lib/libgcj.so.3)
   at 0x4021d094: _Jv_RunMain(java.lang.Class, byte const, int, byte co=
nst, boolean) (/packages/gnu-snapshot/lib/libgcj.so.3)
   at 0x08048a40: main (/packages2/gcc-3.1/libjava/gij.cc:140)
   at 0x405e3668: __libc_start_main (/lib/libc.so.6)
   at 0x080487a1: _start (??:0)

$ java -version
java version "1.3.1_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_02-b02)
Java HotSpot(TM) Client VM (build 1.3.1_02-b02, mixed mode)

$ CLASSPATH=3D. java GetURL $someurl
Retrieving http://localhost/...Exception in thread "main" java.lang.Ver=
ifyError: (class: GetURL$1, method: <init> signature: (LGetURL;)V) Expe=
cting to find object/array on stack
        at GetURL.fetch(GetURL.java:31)
        at GetURL.main(GetURL.java:54)

$ javap -c 'GetURL$1'
Compiled from GetURL.java
final class GetURL$1 extends java.lang.Thread {
    GetURL$1(GetURL);
    public void run();
}

Method GetURL$1(GetURL)
   0 aload_0
   1 aload_1
   2 putfield #12 <Field GetURL this$0>
   5 aload_0
   6 invokespecial #15 <Method java.lang.Thread()>
   9 return

...

>Fix:

Fix the code generated for the constructor of the anonymous inner class=

'GetURL$1'.
>Release-Note:
>Audit-Trail:
>Unformatted: