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digitalmars.D.bugs - [Issue 2604] New: DW_TAG_module and GDB

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2604

           Summary: DW_TAG_module and GDB
           Product: D
           Version: 1.029
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: mihail.zenkov gmail.com


I try fix GDB to support DMD 1.029 and greater. DMD set flag "has children" to
DW_TAG_module and in this case GDB can't find DW_TAG_subprogram, as result we
don't have psymbols. If i change flag to "no children" GDB load psymbols
without problems. Is it bug DMD or GDB? Why DMD set this flag?


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Jan 22 2009
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2604








 I try fix GDB to support DMD 1.029 and greater. DMD set flag "has children" to
 DW_TAG_module and in this case GDB can't find DW_TAG_subprogram, as result we
 don't have psymbols. If i change flag to "no children" GDB load psymbols
 without problems. Is it bug DMD or GDB? Why DMD set this flag?


For those of us waiting for this bug to get fixed, is there any relatively easy
thing we can do to get gdb to work?


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Jan 22 2009
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2604







For those of us waiting for this bug to get fixed, is there any relatively easy
thing we can do to get gdb to work?


1. Use GDC or DMD-1.028. Currently DMD specific DWARF extensions not supported.
http://www.digitalmars.com/d/1.0/abi.html

2. Try patch binary before debug it.

For example we have binary crash_test. 
With next command we can see if DW_TAG_module have "has children" flag:
objdump -W crash_test 2>/dev/null | grep DW_TAG_module

 <1><138>: Abbrev Number: 2 (DW_TAG_module)
   2      DW_TAG_module    [has children]

Try patch it:
sed "s/\x1e\x01\x03\x08/\x1e\x00\x03\x08/" -i crash_test

And see again what we have:
objdump -W crash_test 2>/dev/null | grep DW_TAG_module

 <1><138>: Abbrev Number: 2 (DW_TAG_module)
   2      DW_TAG_module    [no children]


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Jan 23 2009
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2604






I had hoped this would be a workaround for
http://d.puremagic.com/issues/show_bug.cgi?id=2575 but alas, it does not :(

For others trying the sed command, I think you need to use greedy replacement. 
(add a g between the last / and ").  Without that, it did not fix all
occurances of has children for me.


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Jan 23 2009
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2604


Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla digitalmars.com





16:26:51 PDT ---
I plan on simply removing the DW_TAG_module tag, as it seems to cause problems
in GDB.

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Aug 07 2009
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2604


Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED





13:24:42 PDT ---
Fixed dmd 1.047 and 2.032

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Sep 03 2009