[Bug breakpoints/12528] Should we handle constructors that are garbage collected but their debug info isn't?

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

https://sourceware.org/bugzilla/show_bug.cgi?id=12528

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=00ba3162ed1633f9b27f3fdd450e076d3a3f2e90

commit 00ba3162ed1633f9b27f3fdd450e076d3a3f2e90
Author: Yao Qi <yao@codesourcery.com>
Date:   Mon Aug 18 09:57:40 2014 +0800

    Run dw2-var-zero-addr.exp with --readnow

    This patch is to extend dw2-var-zero-add.exp to cover the case that
    partial symtabl is not used while full symtab is used, in order to
    cover the changes in patch 2/3.  This patch restarts GDB with
    --readnow and does the same test again.

    gdb/testsuite:

    2014-09-19  Yao Qi  <yao@codesourcery.com>

        * gdb.dwarf2/dw2-var-zero-addr.exp: Move test into new proc test.
        Invoke test.  Restart GDB with --readnow and invoke test again.

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c3b7b696c231416ac90fd9cb7d5ce735b3683356

commit c3b7b696c231416ac90fd9cb7d5ce735b3683356
Author: Yao Qi <yao@codesourcery.com>
Date:   Mon Aug 4 14:57:22 2014 +0800

    Check function is GC'ed

    I see the following fail on arm-none-eabi target,

    (gdb) b 24^M
    Breakpoint 1 at 0x4: file
    ../../../../git/gdb/testsuite/gdb.base/break-on-linker-gcd-function.cc,
    line 24.^M
    (gdb) FAIL: gdb.base/break-on-linker-gcd-function.exp: b 24

    Currently, we are using flag has_section_at_zero to determine whether
    address zero in debug info means the corresponding code has been
    GC'ed, like this:

        case DW_LNE_set_address:
          address = read_address (abfd, line_ptr, cu, &bytes_read);

          if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
            {
              /* This line table is for a function which has been
             GCd by the linker.  Ignore it.  PR gdb/12528 */

    However, this is incorrect on some bare metal targets, as .text
    section is located at 0x0, so dwarf2_per_objfile->has_section_at_zero
    is true.  If a function is GC'ed by linker, the address is zero.  GDB
    thinks address zero is a function's address rather than this function
    is GC'ed.

    In this patch, we choose 'lowpc' got in read_file_scope to check
    whether 'lowpc' is greater than zero.  If it isn't, address zero really
    means the function is GC'ed.  In this patch, we pass 'lowpc' in
    read_file_scope through handle_DW_AT_stmt_list and dwarf_decode_lines,
    and to dwarf_decode_lines_1 finally.

    This patch fixes the fail above. This patch also covers the path that
    partial symbol isn't used, which is tested by starting gdb with
    --readnow option.

    It is regression tested on x86-linux with
    target_board=dwarf4-gdb-index, and arm-none-eabi.  OK to apply?

    gdb:

    2014-09-19  Yao Qi  <yao@codesourcery.com>

        * dwarf2read.c (dwarf_decode_lines): Update declaration.
        (handle_DW_AT_stmt_list): Add argument 'lowpc'.  Update
        comments.  Callers update.
        (dwarf_decode_lines): Likewise.
        (dwarf_decode_lines_1): Add argument 'lowpc'.  Update
        comments.  Skip the line table if  'lowpc' is greater than
        'address'.  Don't check
        dwarf2_per_objfile->has_section_at_zero.

    gdb/testsuite:

    2014-09-19  Yao Qi  <yao@codesourcery.com>

        * gdb.base/break-on-linker-gcd-function.exp: Move test into new
        proc set_breakpoint_on_gcd_function.  Invoke
        set_breakpoint_on_gcd_function.  Restart GDB with --readnow and
        invoke set_breakpoint_on_gcd_function again.

-----------------------------------------------------------------------

Summary of changes:
 gdb/ChangeLog                                      |   11 ++++++
 gdb/dwarf2read.c                                   |   33 +++++++++++++------
 gdb/testsuite/ChangeLog                            |   12 +++++++
 .../gdb.base/break-on-linker-gcd-function.exp      |   24 +++++++++++---
 gdb/testsuite/gdb.dwarf2/dw2-var-zero-addr.exp     |   19 +++++++++--
 5 files changed, 80 insertions(+), 19 deletions(-)

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