libgcj/7870: Incorrect constructor invoked in inherited class.
ivg2@cornell.edu
ivg2@cornell.edu
Mon Sep 9 12:26:00 GMT 2002
>Number: 7870
>Category: libgcj
>Synopsis: Incorrect constructor invoked in inherited class.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Mon Sep 09 12:26:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: ivg2@cornell.edu
>Release: gij (GNU libgcj) version 3.2 20020822 (Red Hat Linux Rawhide 3.2-4)
>Organization:
>Environment:
Red Hat Rawhide (in sync with server on 9/9/02)
Kernel 2.4.20-pre5
Athlon XP 1600+ processor
>Description:
Here's the code, compiled correctly,
works under interpreter:
gij (GNU libgcj) version 0.0.7
Does not work under:
gij (GNU libgcj) version 3.2 20020822 (Red Hat Linux Rawhide 3.2-4)
Summarry: It appears that a 0-arg constructor
of base class Frame is called, when a 1-argument
constructor of the derived class SaMSimulatorGUI
is present and should be invoked.
Java below is a frontend to gij.
gij GUISimulator has precisely the same behavior.
Compiled with: javac.
gcj -C filename has the same effect.
Options:
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --host=athlon-redhat-linux --with-system-zlib --enable-__cxa_atexit
Thread model: posix
============================================
[phantom@cobra bug]$ ls
GUISimulator.java IDisplay.java SaM.java SaMSimulatorGUI.java
[phantom@cobra bug]$ cat IDisplay.java
interface IDisplay { }
[phantom@cobra bug]$ cat SaM.java
public class SaM { }
[phantom@cobra bug]$ cat GUISimulator.java
public class GUISimulator
{ public static void main(String[] args)
{ IDisplay g = new SaMSimulatorGUI(new SaM()); } }
[phantom@cobra bug]$ cat SaMSimulatorGUI.java
import java.awt.*;
public class SaMSimulatorGUI extends Frame implements IDisplay { public SaMSimulatorGUI (SaM m) { } }
====================================================
[root@cobra bug]# java GUISimulator
Exception in thread "main" java.lang.NullPointerException
at 0x40226296: ?? (??:0)
at 0xbffff1fc: ?? (??:0)
at 0x4036695a: java.awt.Component.Component() (/usr/lib/libgcj.so.3)
at 0x4036a94f: java.awt.Container.Container() (/usr/lib/libgcj.so.3)
at 0x4037d095: java.awt.Window.Window() (/usr/lib/libgcj.so.3)
at 0x4036fb54: java.awt.Frame.Frame(java.lang.String) (/usr/lib/libgcj.so.3)
at 0x4036fb19: java.awt.Frame.Frame() (/usr/lib/libgcj.so.3)
at 0x403c61bb: ffi_call_SYSV (/usr/lib/libgcj.so.3)
at 0x403c6185: ffi_raw_call (/usr/lib/libgcj.so.3)
at 0x4023ad4f: _Jv_InterpMethod.continue1(_Jv_InterpMethodInvocation) (/usr/l ib/libgcj.so.3)
at 0x4023b664: _Jv_InterpMethod.run(ffi_cif, void, ffi_raw, _Jv_InterpMethodI nvocation) (/usr/lib/libgcj.so.3)
at 0x40238c44: _Jv_InterpMethod.run_normal(ffi_cif, void, ffi_raw, void) (/us r/lib/libgcj.so.3)
at 0x403c604c: ?? (??:0)
at 0x403c61bb: ffi_call_SYSV (/usr/lib/libgcj.so.3)
at 0x403c6185: ffi_raw_call (/usr/lib/libgcj.so.3)
at 0x4023ad4f: _Jv_InterpMethod.continue1(_Jv_InterpMethodInvocation) (/usr/l ib/libgcj.so.3)
at 0x4023b664: _Jv_InterpMethod.run(ffi_cif, void, ffi_raw, _Jv_InterpMethodI nvocation) (/usr/lib/libgcj.so.3)
at 0x40238c44: _Jv_InterpMethod.run_normal(ffi_cif, void, ffi_raw, void) (/us r/lib/libgcj.so.3)
at 0x403c604c: ?? (??:0)
at 0x4024d848: gnu.gcj.runtime.FirstThread.call_main() (/usr/lib/libgcj.so.3)
at 0x402c76b0: gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.3)
at 0x4025a00c: _Jv_ThreadRun(java.lang.Thread) (/usr/lib/libgcj.so.3)
at 0x40227bce: _Jv_RunMain(java.lang.Class, byte const, int, byte const, bool ean) (/usr/lib/libgcj.so.3)
at 0x08048921: ?? (??:0)
at 0x420155e4: ?? (??:0)
at 0x080486e1: ?? (??:0)
[root@cobra bug]#
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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