The following file is miscompiled by gcj -C:
public class Outer extends Thread {
public class Inner extends Thread {
private Inner () {
start ();
}
}
}
It uses the wrong "this" to call start():
Outer$Inner(Outer);
Code:
0: aload_0
1: aload_1
2: putfield #12; //Field this$0:LOuter;
5: aload_0
6: invokespecial #15; //Method java/lang/Thread."<init>":()V
9: aload_1
10: invokevirtual #18; //Method java/lang/Thread.start:()V
13: return
}
Sun's compiler outputs correct code:
private Outer$Inner(Outer);
Code:
0: aload_0
1: aload_1
2: putfield #1; //Field this$0:LOuter;
5: aload_0
6: invokespecial #2; //Method java/lang/Thread."<init>":()V
9: aload_0
10: invokevirtual #3; //Method start:()V
13: return
}
The difference is at 9.
Note: The bug does not occur if you just replace start() (which is declared in
java.lang.Thread) with notify() (which is declared in java.lang.Object).
--
Summary: Wrong "this" used when call made to superclass which is
also superclass of enclosing class
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: java
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: greenrd at greenrd dot org
CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23230
