[Bug objc/57428] New: Objective C exceptions completely broken in gcc 4.7

[kostja.osipov at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57428

            Bug ID: 57428
           Summary: Objective C exceptions completely broken in gcc 4.7
           Product: gcc
           Version: 4.7.3
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: objc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kostja.osipov at gmail dot com

/* Compile with: gcc gcc-objective-c-exceptions.m -fobjc-exceptions -o test
-lobjc */


#include <stdio.h>
#include <stdlib.h>

#import <objc/runtime.h>

@interface Object {
    Class isa;
}
+ (id) alloc;
- (id) init;
- (void) free;
@end

@implementation Object
+ (id) alloc
{
    return class_createInstance(self, 0);
}
- (id) init
{
    return self;
}
- (void) free
{
    object_dispose(self);
}
@end

@interface Frob: Object
@end

@implementation Frob: Object
@end

int proc() {
    @throw [[Frob alloc] init];
}

int foo()
{
    @try {
        return proc();
    }
    @catch (Frob *) {
        printf("Catch(Frob *)\n");
        return 0;
    }
    @catch (Object *) {
        printf("Catch(Object *)\n");
        return 0;
    }
    @catch (id) {
        printf("Catch(id)\n");
        return 0;
    }
}

int main(void)
{
    foo();
    return 0;
}



roman@work:~$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.7.2-5'
--with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.7 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object
--enable-plugin --enable-objc-gc --with-arch-32=i586 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.2 (Debian 4.7.2-5)

roman@work:~$ gcc gcc-objective-c-exceptions.m -fobjc-exceptions -o test -lobjc
roman@work:~$ gdb ./test
GNU gdb (GDB) 7.4.1-debian
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from test...(no debugging symbols found)...done.
(gdb) r
Starting program: test

Program received signal SIGSEGV, Segmentation fault.
__objc_responds_to (sel=<optimized out>, object=0x601340) at
/home/packages/gcc/4.7/w/gcc-4.7-4.7.2/src/libobjc/sendmsg.c:398
398 res = sarray_get_safe (dtable, (size_t) sel->sel_id);
(gdb) bt
#0 __objc_responds_to (sel=<optimized out>, object=0x601340) at
/home/packages/gcc/4.7/w/gcc-4.7-4.7.2/src/libobjc/sendmsg.c:398
#1 __objc_forward (object=0x601340, sel=0x6016a0, args=0x7fffffffe010) at
/home/packages/gcc/4.7/w/gcc-4.7-4.7.2/src/libobjc/sendmsg.c:905
#2 0x00007ffff7bd24ed in __objc_word_forward (rcv=<optimized out>,
op=<optimized out>)
at /home/packages/gcc/4.7/w/gcc-4.7-4.7.2/src/libobjc/sendmsg.c:844
#3 0x0000000000400a7c in proc ()
#4 0x0000000000400ab0 in foo ()
#5 0x0000000000400b1b in main ()