[Bug gdb/11616] DW_OP_form_tls_address is unimplemented

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=11616

--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom Tromey <tromey@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=4aa4e28bdcf5f0d733def62b542fea11d5f219d5

commit 4aa4e28bdcf5f0d733def62b542fea11d5f219d5
Author: Tom Tromey <tom@tromey.com>
Date:   Mon Aug 22 16:56:52 2016 -0600

    Handle DW_OP_form_tls_address

    Currently gdb supports DW_OP_GNU_push_tls_address, but not
    DW_OP_form_tls_address.  I think it would be better if the toolchain
    as a whole moved to using the standard opcode, and the prerequisite to
    this is getting gdb to recognize it.

    GCC can sometimes emit DW_OP_form_tls_address for emultls targets.  As
    far as I know, nobody has ever tried this with gdb (since it wouldn't
    work at all).

    I don't think there's a major drawback to using a single opcode for
    all targets, because computing the location of a thread-local is
    already target specific.

    This is PR gdb/11616.

    I don't know how to write a test case for this; though it's worth
    noting that there aren't explicit tests for DW_OP_GNU_push_tls_address
    either -- and if I change GCC, these paths will be tested to the same
    extent they are now.

    2016-09-02  Tom Tromey  <tom@tromey.com>

        PR gdb/11616:
        * dwarf2read.c (decode_locdesc): Handle DW_OP_form_tls_address.
        * dwarf2loc.c (dwarf2_compile_expr_to_ax): Handle
        DW_OP_form_tls_address.
        (locexpr_describe_location_piece): Likewise.
        * dwarf2expr.h (struct dwarf_expr_context_funcs): Update comment.
        * dwarf2expr.c (execute_stack_op): Handle DW_OP_form_tls_address.
        (ctx_no_get_tls_address): Mention DW_OP_form_tls_address.
        * compile/compile-loc2c.c (struct insn_info): Update comment.
        (compute_stack_depth_worker): Handle DW_OP_form_tls_address.

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