[Bug libgcj/21906] New: hang when invoking abstract method

[Bug libgcj/21906] New: hang when invoking abstract method

[tromey at gcc dot gnu dot org]

Try the test case "abstract.fail.abstract2" from the mauve
"verify" module.  (You will need jasmin to build this.)

This test case gets a SEGV in the unwinder:

Program received signal SIGSEGV, Segmentation fault.
uw_frame_state_for (context=0xbfff9998, fs=0xbfff98d8) at linux-unwind.h:125
125	in linux-unwind.h

Continuing results in the same SEGV endlessly.


The underlying cause of this is that a _Jv_Method has 0x0 as its
'ncode'.  Instead it would be more correct to put
'throw new AbstractMethodError' there.  I have a partial patch
to do this (the compiler should also do this...).
However I think the unwinder crashing is a bug regardless of whether
this other problem is fixed.

-- 
           Summary: hang when invoking abstract method
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libgcj
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tromey at gcc dot gnu 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=21906

[Bug libgcj/21906] hang when invoking abstract method

[tromey at gcc dot gnu dot org]

------- Additional Comments From tromey at gcc dot gnu dot org  2005-06-04 06:13 -------
Created an attachment (id=9026)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9026&action=view)
abstract/fail/abstract2.class

I've uploaded the class files so that you don't
have to dig up jasmin.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21906

[Bug libgcj/21906] hang when invoking abstract method

[tromey at gcc dot gnu dot org]

------- Additional Comments From tromey at gcc dot gnu dot org  2005-06-04 06:13 -------
Created an attachment (id=9025)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9025&action=view)
abstract/fail/abstract1.class


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21906

[Bug libgcj/21906] hang when invoking abstract method

[tromey at gcc dot gnu dot org]

------- Additional Comments From tromey at gcc dot gnu dot org  2005-06-14 20:26 -------
I am testing a patch.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |tromey at gcc dot gnu dot
                   |dot org                     |org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-06-14 20:26:11
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21906

[Bug libgcj/21906] hang when invoking abstract method

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-06-15 19:11 -------
Subject: Bug 21906

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	tromey@gcc.gnu.org	2005-06-15 19:11:43

Modified files:
	libjava        : ChangeLog defineclass.cc link.cc 
	libjava/include: jvm.h 
	gcc/java       : ChangeLog class.c decl.c java-tree.h 

Log message:
	gcc/java/:
	PR libgcj/21906:
	* class.c (make_method_value): Use soft_abstractmethod_node for
	abstract method.
	* java-tree.h (soft_abstractmethod_node): New define.
	(JTI_SOFT_ABSTRACTMETHOD_NODE): New enum constant.
	* decl.c (java_init_decl_processing): Initialize
	soft_abstractmethod_node.
	libjava/:
	PR libgcj/21906:
	* defineclass.cc (handleMethodsEnd): Set ncode for abstract
	methods.
	* include/jvm.h (_Jv_ThrowAbstractMethodError): Declare.
	* link.cc (_Jv_ThrowAbstractMethodError): Renamed.  No longer
	static.
	(append_partial_itable): Use it.
	(set_vtable_entries): Likewise.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libjava/ChangeLog.diff?cvsroot=gcc&r1=1.3666&r2=1.3667
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libjava/defineclass.cc.diff?cvsroot=gcc&r1=1.45&r2=1.46
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libjava/link.cc.diff?cvsroot=gcc&r1=1.15&r2=1.16
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/libjava/include/jvm.h.diff?cvsroot=gcc&r1=1.87&r2=1.88
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/java/ChangeLog.diff?cvsroot=gcc&r1=1.1629&r2=1.1630
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/java/class.c.diff?cvsroot=gcc&r1=1.232&r2=1.233
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/java/decl.c.diff?cvsroot=gcc&r1=1.223&r2=1.224
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/java/java-tree.h.diff?cvsroot=gcc&r1=1.236&r2=1.237



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21906

[Bug libgcj/21906] hang when invoking abstract method

[tromey at gcc dot gnu dot org]

------- Additional Comments From tromey at gcc dot gnu dot org  2005-06-15 19:12 -------
I checked in a fix.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21906