[Bug debug/13111] New: g++ debuginfo incorrect for verify.cc

[tromey at gcc dot gnu dot org]

I found this problem while debugging Bug 13107.
It is fairly simple to reproduce.
The problem seems to be that g++ generates incorrect debug info;
in any case, gdb winds up with incorrect line numbers.
This didn't happen the last time I debugged the verifier, some months
ago.

First, build gcc including java.
I rebuilt libgcj with CXXFLAGS=-g (and also tried -g3).

Grab the test file from Bug 13107 and compile it:
gcj -C GIJ.java

Now run gdb on gij.  "b main"; "run GIJ"
When it stops, "b '_Jv_BytecodeVerifier::verify_instructions_0()'"
"cont"

I get:

Breakpoint 3, _Jv_BytecodeVerifier::verify_instructions_0() (this=0xbfffecf0)
    at ../../../gcc/libjava/verify.cc:995

But, whoops, line 995 is in operator new.
verify_instructions_0 doesn't start until line 2287.

There are plenty of other similar problems with the debuginfo in this
file; this is just the easiest one to find.  This makes debugging
the verifier very difficult.

-- 
           Summary: g++ debuginfo incorrect for verify.cc
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tromey at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13111