gcc-objective-c-exceptions.m

/* 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;
}

output-debian.txt

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 ()

output-fedora.txt

[buildslave@localhost objc-exception-bug]$ gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.7.2/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --disable-build-with-cxx --disable-build-poststage1-with-cxx --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.7.2 20121109 (Red Hat 4.7.2-8) (GCC) 

[buildslave@localhost objc-exception-bug]$ gcc -fobjc-exceptions gcc-objective-c-exceptions.m -o test -lobjc 
[buildslave@localhost objc-exception-bug]$ gdb ./test
rGNU gdb (GDB) Fedora (7.5.1-38.fc18)
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-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/buildslave/objc-exception-bug/test...(no debugging symbols found)...done.
(gdb) r
Starting program: /home/buildslave/objc-exception-bug/test 

Program received signal SIGSEGV, Segmentation fault.
__objc_responds_to (sel=<optimized out>, object=0x602120 <_OBJC_Class_Frob>) at /usr/src/debug/gcc-4.7.2-20121109/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=0x602120 <_OBJC_Class_Frob>) at /usr/src/debug/gcc-4.7.2-20121109/libobjc/sendmsg.c:398
#1  __objc_forward (object=0x602120 <_OBJC_Class_Frob>, sel=0x602480 <_OBJC_SELECTOR_TABLE>, args=0x7fffffffe330)
    at /usr/src/debug/gcc-4.7.2-20121109/libobjc/sendmsg.c:905
#2  0x00007ffff7de6cfd in __objc_word_forward (rcv=<optimized out>, op=<optimized out>) at /usr/src/debug/gcc-4.7.2-20121109/libobjc/sendmsg.c:844
#3  0x0000000000400a2c in proc ()
#4  0x0000000000400a60 in foo ()
#5  0x0000000000400acb in main ()