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* gdb and binutils branch master updated. 2df4d1d5c4393fd06c2bffe75499e70a8d8ac8a8
@ 2013-11-11 15:19 brobecke
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From: brobecke @ 2013-11-11 15:19 UTC (permalink / raw)
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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2df4d1d5c4393fd06c2bffe75499e70a8d8ac8a8

commit 2df4d1d5c4393fd06c2bffe75499e70a8d8ac8a8
Author: Joel Brobecker <brobecker@adacore.com>
Date:   Wed Oct 30 11:18:24 2013 +0100

    Dandling memory pointers in Ada catchpoints with GDB/MI.
    
    When using the GDB/MI commands to insert a catchpoint on a specific
    Ada exception, any re-evaluation of that catchpoint (for instance
    a re-evaluation performed after a shared library got mapped by the
    inferior) fails. For instance, with any Ada program:
    
        (gdb)
        -catch-exception -e program_error
        ^done,bkptno="1",bkpt={[...]}
        (gdb)
        -exec-run
        =thread-group-started,id="i1",pid="28315"
        =thread-created,id="1",group-id="i1"
        ^running
        *running,thread-id="all"
        (gdb)
        =library-loaded,[...]
        &"warning: failed to reevaluate internal exception condition for catchpoint 1: No definition of \"exec\" in current context.\n"
        &"warning: failed to reevaluate internal exception condition for catchpoint 1: No definition of \"exec\" in current context.\n"
        [...]
    
    The same is true if using an Ada exception catchpoint.
    
    The problem comes from the fact that that we deallocate the strings
    given as arguments to create_ada_exception_catchpoint, while the latter
    just makes shallow copies of those strings, thus creating dandling
    pointers.
    
    This patch fixes the issue by passing freshly allocated strings to
    create_ada_exception_catchpoint, while at the same time updating
    create_ada_exception_catchpoint's documentation to make it clear
    that deallocating the strings is no longer the responsibility of
    the caller.
    
    gdb/ChangeLog:
    
            * ada-lang.c (create_ada_exception_catchpoint): Enhance
            the documentation of fields "except_string" and "condition".
            * mi/mi-cmd-catch.c (mi_cmd_catch_assert): Reallocate
            CONDITION on the heap before passing it to
            create_ada_exception_catchpoint.
            (mi_cmd_catch_exception): Likewise for EXCEPTION_NAME and
            CONDITION.
    
    gdb/testsuite/ChangeLog:
    
            * gdb.ada/mi_ex_cond: New testcase.
    
    Tested on x86_64-linux.  The "-break-list" test FAILs without
    this patch.

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

Summary of changes:
 gdb/ChangeLog                            |   10 +++
 gdb/ada-lang.c                           |   14 +++--
 gdb/mi/mi-cmd-catch.c                    |   10 +++
 gdb/testsuite/ChangeLog                  |    4 +
 gdb/testsuite/gdb.ada/mi_ex_cond.exp     |   94 ++++++++++++++++++++++++++++++
 gdb/testsuite/gdb.ada/mi_ex_cond/foo.adb |   29 +++++++++
 gdb/testsuite/gdb.ada/mi_ex_cond/pck.ads |   18 ++++++
 7 files changed, 174 insertions(+), 5 deletions(-)
 create mode 100644 gdb/testsuite/gdb.ada/mi_ex_cond.exp
 create mode 100644 gdb/testsuite/gdb.ada/mi_ex_cond/foo.adb
 create mode 100644 gdb/testsuite/gdb.ada/mi_ex_cond/pck.ads


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