[Bug debug/50544] New: Wrong esp offset in debug infos for functions that call stdcall functions

[Bug debug/50544] New: Wrong esp offset in debug infos for functions that call stdcall functions

[bernhardloos at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50544

             Bug #: 50544
           Summary: Wrong esp offset in debug infos for functions that
                    call stdcall functions
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: bernhardloos@googlemail.com


Created attachment 25372
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25372
compile with -g -O2

In the attached program, f2 disassambles to this:
   0x08048400 <+0>:     sub    $0x1c,%esp
   0x08048403 <+3>:     mov    0x8049708,%eax
   0x08048408 <+8>:     mov    %eax,(%esp)
   0x0804840b <+11>:    call   0x80483e0 <f>
   0x08048410 <+16>:    sub    $0x4,%esp
   0x08048413 <+19>:    add    $0x1c,%esp
   0x08048416 <+22>:    ret

If one places a breakpoint at 0x08048410  the stack looks like this:
Breakpoint 1, 0x08048410 in f2 () at asdf.c:20
20          f(x);
(gdb) bt
#0  0x08048410 in f2 () at asdf.c:20
#1  0x08048420 in ?? ()
#2  0x4dedd413 in __libc_start_main (main=0x8048310 <main>, argc=1,
ubp_av=0xbffff724,
    init=0x8048420 <__libc_csu_init>, fini=0x8048490 <__libc_csu_fini>,
    rtld_fini=0x4deb1dd0 <_dl_fini>, stack_end=0xbffff71c) at libc-start.c:226
#3  0x08048341 in _start ()

For 0x08048413, it looks as it should:
#0  f2 () at asdf.c:22
#1  0x0804831b in main (argc=1, argv=0xbffff724) at asdf.c:27

I would guess that the frame adjustment DWARF op is not emitted for the
instruction at 0x08048410.
Normally this wouldn't be much of a problem, but wine hits this sometimes with
the way it sets up windows exceptions, which makes this very annoying.

gcc version is
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-redhat-linux/4.6.1/lto-wrapper
Target: i686-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 --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-gnu-unique-object
--enable-linker-build-id
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin
--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=i686
--build=i686-redhat-linux
Thread model: posix
gcc version 4.6.1 20110804 (Red Hat 4.6.1-7) (GCC)