[Bug libgcj/50057] [4.7 regression] misalignment of java_exception_header resulted in throwable to be null

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

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

gee <jojelino at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.7 regression] SIGSEGV in |[4.7 regression]
                   |natObject.cc:58             |misalignment of
                   |                            |java_exception_header
                   |                            |resulted in throwable to be
                   |                            |null
           Severity|normal                      |major

--- Comment #3 from gee <jojelino at gmail dot com> 2012-01-18 06:20:40 UTC ---
in libjava/exception.cc
  /* The object being thrown.  Compiled code expects this to be immediately
     before the generic exception header.  Which is complicated by the fact
     that _Unwind_Exception is ((aligned)).  */


Starting program: /tmp/gcc/i686-pc-mingw32/libjava/testsuite/.libs/PR218
[New Thread 6064.0x1e4c]

Breakpoint 13, _Jv_Throw (value=0xa9ba08) at ../.././libjava/exception.cc:118
118       _Unwind_RaiseException (&xh->unwindHeader);
(gdb) p ((int)&xh->unwindHeader-(int)&xh->value)
$19 = 0xc

It seems that padding was unsuccessful.

following is version info.

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-pc-cygwin/4.7.0/lto-wrapper.exe
Target: i686-pc-cygwin
Configured with: ./configure --config-cache --prefix=/usr
--disable-win32-registry --enable-threads=win32
--enable-languages=c,c++,lto,fortran --with-win32-nlsapi=unicode --enable-tls
--disable-bootstrap --enable-shared --disable-sjlj-exceptions --enable-gomp
--enable-cloog-backend=isl LTLDFLAGS=-no-undefined
lt_cv_deplibs_check_method=pass_all : (reconfigured) ./configure --config-cache
--prefix=/usr --disable-win32-registry --enable-threads=win32
--enable-languages=c,c++,lto,fortran --with-win32-nlsapi=unicode --enable-tls
--disable-bootstrap --enable-shared --disable-sjlj-exceptions --enable-gomp
--enable-cloog-backend=isl LTLDFLAGS=-no-undefined
lt_cv_deplibs_check_method=pass_all
Thread model: win32
gcc version 4.7.0 20120114 (experimental) (GCC)