[Bug translator/12997] support dwarf4 .debug_types

["wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=12997

William Cohen <wcohen at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |wcohen at redhat dot com

--- Comment #2 from William Cohen <wcohen at redhat dot com> ---
This is partially addressed by git commit
337b7c44b1cd672f76e58166a562c12a300ddb20:

Author: Tom Tromey <tromey@redhat.com>  2012-03-16 12:44:14
Committer: Mark Wielaard <mjw@redhat.com>  2012-03-21 11:36:31
Parent: 1485ded3f2d709c9011bd9f340ce39b1930f7e32 (PR13876: same another test
case)
Child:  2a885a4a9ca1826187c97c7eb128b06b4a5222f2 (Depend on elfutils 0.148+,
document debug_types support requires 0.154+.)
Branches: master, remotes/origin/master and many more (54)
Follows: release-1.7
Precedes: release-1.8

    Partial fix for PR12997 - support dwarf4 .debug_types

    This fix does not solve the ET_REL case pointed out in the PR.
    However, it does work ok for ordinary code.

        * dwflpp.cxx (dwflpp::iterate_over_cus): Add 'want_types' argument.
        Iterate over type units.
        (dwflpp::declaration_resolve_other_cus): Update.
        (dwflpp::iterate_single_function): Update.
        (dwflpp::iterate_over_globals): Also allow DW_TAG_type_unit.
        * dwflpp.h (module_tus_read_t): New typedef.
        (dwflpp::iterate_over_cus): Update.
        (dwflpp::module_tus_read): New member.
        * tapsets.cxx (dwarf_query::query_module_dwarf): Update.
        (tracepoint_query::handle_query_module): Update.
        * testsuite/systemtap.pass1-4/debugtypes.cxx: New file.
        * testsuite/systemtap.pass1-4/debugtypes.exp: New file.
        * testsuite/systemtap.pass1-4/debugtypes.stp: New file.

    I built gdb with '-gdwarf-4 -fdebug-types-section'.
    Then I tried this stap script:

    probe
process("/home/tromey/gnu/archer/build/gdb/gdb").function("dwarf2_attr") {
          println(@cast($dwarf2_per_objfile, "struct
dwarf2_per_objfile")->objfile)
    }

    With Fedora 16 stap:

    barimba. stap -p2 /tmp/q.stp
    semantic error: type definition 'struct dwarf2_per_objfile' not found:
identifier '@cast' at /tmp/q.stp:2:15
            source:       println(@cast($dwarf2_per_objfile, "struct
dwarf2_per_objfile")->objfile)
                                      ^
    Pass 2: analysis failed.  Try again with another '--vp 01' option.

    After the patch, this works.

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