[Bug gdb/15911] "info threads" changes the default source and line (for "break", "list")

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

http://sourceware.org/bugzilla/show_bug.cgi?id=15911

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    palves@sourceware.org    2013-09-17 18:26:41

Modified files:
    gdb            : ChangeLog ada-tasks.c bsd-kvm.c corelow.c 
                     frame.h infcmd.c inferior.c infrun.c 
                     linux-fork.c record-full.c remote-mips.c 
                     stack.c thread.c tracepoint.c 
    gdb/mi         : mi-cmd-stack.c mi-interp.c mi-main.c 
    gdb/testsuite  : ChangeLog 
Added files:
    gdb/testsuite/gdb.threads: info-threads-cur-sal-2.c 
                               info-threads-cur-sal.c 
                               info-threads-cur-sal.exp 

Log message:
    PR gdb/15911: "info threads" changes the default source and line (for
"break", "list")

    "info threads" changes the default source for "break" and "list", to
    whatever the location of the first/bottom thread in the thread list
    is...

    (gdb) b start
    (gdb) c
    ...
    (gdb) list
    *lists "start"*
    (gdb) b 23
    Breakpoint 3 at 0x400614: file test.c, line 23.
    (gdb) info threads
    Id   Target Id         Frame
    * 2    Thread 0x7ffff7fcb700 (LWP 1760) "test" start (arg=0x0) at test.c:23
    1    Thread 0x7ffff7fcc740 (LWP 1748) "test" 0x000000323dc08e60 in
pthread_join (threadid=140737353922304, thread_return=0x0) at pthread_join.c:93
    (gdb) b 23
    Breakpoint 4 at 0x323dc08d90: file pthread_join.c, line 23.
    ^^^^^^^^^^^^^^^
    (gdb) list
    93          lll_wait_tid (pd->tid);
    94
    95
    96        /* Restore cancellation mode.  */
    97        CANCEL_RESET (oldtype);
    98
    99        /* Remove the handler.  */
    100       pthread_cleanup_pop (0);
    101
    102

    The issue is that print_stack_frame always sets the current sal to the
    frame's sal.  print_frame_info (which print_stack_frame calls to do
    most of the work) also sets the last displayed sal, but only if
    print_what isn't LOCATION.  Now the call in question, from within
    thread.c:print_thread_info, does pass in LOCATION as print_what, but
    print_stack_frame doesn't have the same check print_frame_info has.
    We could consider adding it, but setting these globals depending on
    print_what isn't very clean, IMO.  What we have is two logically
    distinct operations mixed in the same function(s):

    #1 - print frame, in the format specified by {print_what,
    print_level and print_args}.

    #2 - We're displaying a frame to the user, and I want the default
    sal to point here, because the program stopped here, or the user
    did some context-changing command (up, down, etc.).

    So I added a new parameter to print_stack_frame & friends for point
    #2, and went through all calls in the tree adjusting as necessary.

    Tested on x86_64 Fedora 17.

    gdb/
    2013-09-17  Pedro Alves  <palves@redhat.com>

    PR gdb/15911
    * ada-tasks.c (task_command_1): Adjust call to print_stack_frame.
    * bsd-kvm.c (bsd_kvm_open, bsd_kvm_proc_cmd, bsd_kvm_pcb_cmd):
    * corelow.c (core_open):
    * frame.h (print_stack_frame, print_frame_info): New
    'set_current_sal' parameter.
    * infcmd.c (finish_command, kill_command): Adjust call to
    print_stack_frame.
    * inferior.c (inferior_command): Likewise.
    * infrun.c (normal_stop): Likewise.
    * linux-fork.c (linux_fork_context): Likewise.
    * record-full.c (record_full_goto_entry, record_full_restore):
    Likewise.
    * remote-mips.c (common_open): Likewise.
    * stack.c (print_stack_frame): New 'set_current_sal' parameter.
    Use it.
    (print_frame_info): New 'set_current_sal' parameter.  Set the last
    displayed sal depending on the new paremeter instead of looking at
    print_what.
    (backtrace_command_1, select_and_print_frame, frame_command)
    (current_frame_command, up_command, down_command): Adjust call to
    print_stack_frame.
    * thread.c (print_thread_info, restore_selected_frame)
    (do_captured_thread_select): Adjust call to print_stack_frame.
    * tracepoint.c (tfind_1): Likewise.
    * mi/mi-cmd-stack.c (mi_cmd_stack_list_frames)
    (mi_cmd_stack_info_frame): Likewise.
    * mi/mi-interp.c (mi_on_normal_stop): Likewise.
    * mi/mi-main.c (mi_cmd_exec_return, mi_cmd_trace_find): Likewise.

    gdb/testsuite/
    * gdb.threads/info-threads-cur-sal-2.c: New file.
    * gdb.threads/info-threads-cur-sal.c: New file.
    * gdb.threads/info-threads-cur-sal.exp: New file.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.16002&r2=1.16003
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ada-tasks.c.diff?cvsroot=src&r1=1.59&r2=1.60
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/bsd-kvm.c.diff?cvsroot=src&r1=1.37&r2=1.38
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/corelow.c.diff?cvsroot=src&r1=1.134&r2=1.135
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/frame.h.diff?cvsroot=src&r1=1.210&r2=1.211
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/infcmd.c.diff?cvsroot=src&r1=1.333&r2=1.334
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/inferior.c.diff?cvsroot=src&r1=1.43&r2=1.44
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/infrun.c.diff?cvsroot=src&r1=1.590&r2=1.591
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/linux-fork.c.diff?cvsroot=src&r1=1.45&r2=1.46
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/record-full.c.diff?cvsroot=src&r1=1.10&r2=1.11
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/remote-mips.c.diff?cvsroot=src&r1=1.145&r2=1.146
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/stack.c.diff?cvsroot=src&r1=1.279&r2=1.280
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/thread.c.diff?cvsroot=src&r1=1.156&r2=1.157
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/tracepoint.c.diff?cvsroot=src&r1=1.323&r2=1.324
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/mi/mi-cmd-stack.c.diff?cvsroot=src&r1=1.76&r2=1.77
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/mi/mi-interp.c.diff?cvsroot=src&r1=1.86&r2=1.87
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/mi/mi-main.c.diff?cvsroot=src&r1=1.240&r2=1.241
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.3808&r2=1.3809
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.threads/info-threads-cur-sal-2.c.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.threads/info-threads-cur-sal.c.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.threads/info-threads-cur-sal.exp.diff?cvsroot=src&r1=NONE&r2=1.1

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