debug/3352: extern/inline combination in try/catch causes wrong lineinfo for all symbols in file

debug/3352: extern/inline combination in try/catch causes wrong lineinfo for all symbols in file

[jakacki]

>Number:         3352
>Category:       debug
>Synopsis:       extern/inline combination in try/catch causes wrong lineinfo for all symbols in file
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jun 21 18:46:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Grzegorz Jakacki <jakacki@cidc.com.cn>
>Release:        gcc version 2.95.2 19991024 (release) , GNU nm 2.9.1
>Organization:
>Environment:
sparc-sun-solaris2.6
>Description:
When there is extern function call in 'try' and inlined 
function is called 'catch', and this construct appears in
the last function definition in the source file, all the 
symbols in the file get the lineinfo of the inlined 
function. 

The bug was also present in nightly x86 GNU/Linux 
build on 2001-06-20, gcc-3_0-branch (CodeSourcery).
>How-To-Repeat:
$ gcc -c -g inlined_catch_debuginfo_bug.cc
$ nm -l inlined_catch_debuginfo_bug.o | grep main
000000e0 t Letext       /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
00000000 ? __EXCEPTION_TABLE__  /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
00000000 ? __FRAME_BEGIN__      /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
         U __cp_pop_exception   /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
         U __eh_rtime_match     /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
         U __rtti_user  /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
         U __start_cp_handler   /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
00000000 W __tf9exception       /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
         U __throw      /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
00000008 C __ti9exception
         U external__Fv /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
00000000 W inlined__Fv  /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
00000000 T main /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
         U terminate__Fv        /home/jakacki/projects/partition/systemc_release/src/gcc-bug/inlined_catch_debuginfo_bug.cc:11
$ cat inlined_catch_debuginfo_bug.cc
//
// compile with 'gcc -c -g'
// (gcc version 2.95.2 19991024 (release))
//
// and make 'nm -l'; the line number of 'main' is 11 not 15 */
// GNU nm 2.9.1

class exception {
};

inline void inlined() {} /* line 11 */

extern void external();

int main(int argc, char* argv[]) /* line 15 */
{
    try
    {
      external();
    }
    catch(const exception &x)
    {
      inlined();
    }
}


$
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

Re: debug/3352: extern/inline combination in try/catch causes wrong lineinfo for all symbols in file

[dberlin]

Synopsis: extern/inline combination in try/catch causes wrong lineinfo for all symbols in file

Responsible-Changed-From-To: unassigned->dberlin
Responsible-Changed-By: dberlin
Responsible-Changed-When: Tue Dec 18 14:23:29 2001
Responsible-Changed-Why:
    Me	
State-Changed-From-To: open->closed
State-Changed-By: dberlin
State-Changed-When: Tue Dec 18 14:23:29 2001
State-Changed-Why:
    This is an assembler/linker bug (somewhere in bfd's stabs handling, in other words).
    if you look at the output of gcc, it's identifying the correct lines.
    I.e. we have
         .stabs  "main:F(0,1)",36,0,16,main
    etc
    However, the object file incorrectly has:
             U _Unwind_Resume       /home/dberlin/a.cc:11
    00000000 W _Z7inlinedv  /home/dberlin/a.cc:11
             U _Z8externalv /home/dberlin/a.cc:11
    00000000 V _ZTI9exception       /home/dberlin/a.cc:11
    00000000 V _ZTS9exception       /home/dberlin/a.cc:11
             U _ZTVN10__cxxabiv117__class_type_infoE        /home/dberlin/a.cc:11
             U __cxa_begin_catch    /home/dberlin/a.cc:11
             U __cxa_end_catch      /home/dberlin/a.cc:11
             U __gxx_personality_v0 /home/dberlin/a.cc:11
    00000000 T main /home/dberlin/a.cc:11
    
    So the problem isn't gcc, it's the assembler/bfd

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3352