[Bug libgcj/50057] New: [4.7 regression] SIGSEGV in natObject.cc:58

["jojelino at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

             Bug #: 50057
           Summary: [4.7 regression] SIGSEGV in natObject.cc:58
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcj
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jojelino@gmail.com
              Host: i686-pc-cygwin
            Target: i686-pc-mingw32
             Build: i686-pc-cygwin


Created attachment 24992
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24992
try to resolve 'o1' class on runtime, and got sigsegv

when referenced class(oo1) is not found in classpath, it throwed
classnotfoundexception.
but it sigsegved 

Starting program: /usr/i686-pc-mingw32/java/bin/i686-pc-mingw32-gij -cp .
foobar --verbose
[New Thread 7704.0x1af8]
[New Thread 7704.0x2b60]

Program received signal SIGSEGV, Segmentation fault.
0x696cfc4a in java::lang::Object::getClass (this=0x0)
    at ../.././libjava/java/lang/natObject.cc:58
58        return (*dt)->clas;
(gdb) bt
#0  0x696cfc4a in java::lang::Object::getClass (this=0x0)
    at ../.././libjava/java/lang/natObject.cc:58
#1  0x696b8bbf in _Jv_InterpMethod::check_handler (this=0xe12f60, pc=0x22e8d8,
    meth=0xe12f60, ex=0x0) at ../.././libjava/interpret.cc:1463
#2  0x696a99f5 in _Jv_InterpMethod::run (retp=0x22f104, args=0x22f124,
    meth=0xe12f60) at ../.././libjava/interpret-run.cc:2676
#3  0x696a2251 in _Jv_InterpMethod::run_normal (ret=0x22f104, args=0x22f124,
    __this=0xe12f60) at ../.././libjava/interpret.cc:358
#4  0x6a432ee5 in ffi_closure_raw_SYSV () at ../.././libffi/src/x86/win32.S:695
#5  0x6a432d37 in ffi_call_win32 () at ../.././libffi/src/x86/win32.S:424
#6  0x6a432d13 in ffi_raw_call (cif=0xbf0b24, fn=0xe30098, rvalue=0x22f4e0,
    fake_avalue=0x22f1c0) at ../.././libffi/src/x86/ffi.c:647
#7  0x696a351f in _Jv_InterpMethod::run (retp=0x22fd20, args=0x22fd40,
    meth=0xab8e60) at ../.././libjava/interpret-run.cc:611
#8  0x696a237a in _Jv_InterpMethod::run_class (ret=0x22fd20, args=0x22fd40,
    __this=0xab8e60) at ../.././libjava/interpret.cc:407
#9  0x6a432ee5 in ffi_closure_raw_SYSV () at ../.././libffi/src/x86/win32.S:695
#10 0x696c282c in gnu::java::lang::MainThread::call_main (this=0xbfdf60)
    at ../.././libjava/gnu/java/lang/natMainThread.cc:54
#11 0x6973c37d in gnu.java.lang.MainThread.run()void (this=@bfdf60)
    at /tmp/gcc/libjava/gnu/java/lang/MainThread.java:106
#12 0x696d4d4d in _Jv_ThreadRun (thread=0xbfdf60)
    at ../.././libjava/java/lang/natThread.cc:335
---Type <return> to continue, or q <return> to quit---
#13 0x69684e9b in _Jv_RunMain (vm_args=0x22fef4, klass=0x0,
    name=0x3d8925 "foobar", argc=0x2, argv=0x3d89fc, is_jar=0x0)
    at ../.././libjava/prims.cc:1789
#14 0x66bc24b0 in _fu0___ZN3gcj13verifyClassesE ()
    at ../.././libjava/gij.cc:333
#15 0x004010fd in __mingw_CRTStartup () at ../../.././winsup/mingw/crt1.c:244
#16 0x00000408 in ?? ()
#17 0x7ffd4000 in ?? ()
#18 0x00000000 in ?? ()
(gdb)

and _Jv_Throw doesn't seem to pass throwable as argument of
unwind_raiseexception, as a consequence, catch(Throwable e){someoperaton(e);}
leads SIGSEGV.