[Mingw-notify] [ mingw-Bugs-561648 ] __builtin_return returns bad result

[<no...@so...>]

Bugs item #561648, was opened at 2002-05-29 06:57
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=102435&aid=561648&group_id=2435

Category: gcc
Group: Feature requests
Status: Open
Resolution: None
Priority: 5
Submitted By: Aleksey Dukhnyakov (daa77)
Assigned to: Danny Smith (dannysmith)
Summary: __builtin_return returns bad result

Initial Comment:
Hello,

I am using new version of gcc3.1,
Please see my example.
It works properly on gcc2.95-2 and gcc 2.95-3

$ gcc -v
Reading specs from d:/mingw_new1/bin/../lib/gcc-
lib/mingw32/3.1/specs
Configured with: ../gcc/configure --with-gcc --with-gnu-ld -
-with-gnu-as --host=
mingw32 --target=mingw32 --prefix=/mingw --enable-
threads --disable-nls --enable
-languages=f77,c++,objc,ada --disable-win32-registry --
disable-shared
Thread model: win32
gcc version 3.1 
$ cat bug.m
#include <objc/objc-api.h>
#include <objc/Object.h>

@interface MyObject : Object
- (void *) print:(void *) value;
@end

@implementation MyObject
- (void *) print:(void *) value
{
    printf("-[MyObject print: 0x%x]\n",value);
    return (void*)((int)value+1);
}
@end

id objc_msg_send_named(id object, char *opname, ...)
{
    SEL op = sel_get_uid (opname);
    Method* m = class_get_instance_method(object-
>class_pointer, op);
    IMP imp = objc_msg_lookup (object, op);
    arglist_t   args;    
    retval_t result;    

    if (!m) return nil;
    
    args =  __builtin_apply_args();
    result = __builtin_apply((apply_t)imp, args,
            method_get_sizeof_arguments (m));
    __builtin_return (result);
}

int main()
{
    MyObject * obj = [MyObject new];
    void * addr = (void*)0xFFFFFFEF;

    printf("-[obj print:0x%x] : 0x%x\n",addr,[obj print:(void 
*)addr]);

    printf("objc_msg_send_named :0x%
x\n",objc_msg_send_named(obj,"print:",addr));

    return 0;
}
$ gcc bug.m -lobjc
$ a.exe
-[MyObject print: 0xffffffef]
-[obj print:0xffffffef] : 0xfffffff0
-[MyObject print: 0xffffffef]
objc_msg_send_named :0x3d5af6

# 0x3d5af6 it is incorrect result, I expect 0xfffffff0
# And if I comment this line "    if (!m) return nil;"
# then test works properly

$ a.exe
-[MyObject print: 0xffffffef]
-[obj print:0xffffffef] : 0xfffffff0
-[MyObject print: 0xffffffef]
objc_msg_send_named :0xfffffff0

Thanks a lot.
Aleksey



----------------------------------------------------------------------

>Comment By: Danny Smith (dannysmith)
Date: 2002-05-29 11:57

Message:
Logged In: YES 
user_id=11494

I've confirmed the bug.  Thanks for the report and the 
testcase.  

I'm rebuilding gcc now to test for a posssible fix to the 
bug.    

Danny

----------------------------------------------------------------------

You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=102435&aid=561648&group_id=2435