197 lines
6.8 KiB
Diff
197 lines
6.8 KiB
Diff
http://sourceware.org/ml/gdb-patches/2010-01/msg00558.html
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Subject: Re: [patch] print a more useful error message for "gdb core"
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[ Fixed up since the mail. ]
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On Thu, 21 Jan 2010 18:17:15 +0100, Doug Evans wrote:
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> Not an exhaustive list, but if we go down the path of converting "gdb
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> corefile" to "gdb -c corefile", then we also need to think about "file
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> corefile" being converted to "core corefile" [or "target core
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> corefile", "core" is apparently deprecated in favor of "target core"]
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> and "target exec corefile" -> "target core corefile". Presumably
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> "file corefile" (and "target exec corefile") would discard the
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> currently selected executable. But maybe not. Will that be confusing
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> for users? I don't know.
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While thinking about it overriding some GDB _commands_ was not my intention.
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There is a general assumption if I have a shell COMMAND and some FILE I can do
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$ COMMAND FILE
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and COMMAND will appropriately load the FILE.
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FSF GDB currently needs to specify also the executable file for core files
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which already inhibits this intuitive expectation. OTOH with the build-id
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locating patch which could allow such intuitive start notneeding the
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executable file. Still it currently did not work due to the required "-c":
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$ COMMAND -c COREFILE
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Entering "file", "core-file" or "attach" commands is already explicit enough
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so that it IMO should do what the command name says without any
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autodetections. The second command line argument
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(captured_main->pid_or_core_arg) is also autodetected (for PID or CORE) but
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neither "attach" accepts a core file nor "core-file" accepts a PID.
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The patch makes sense only with the build-id patchset so this is not submit
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for FSF GDB inclusion yet. I am fine with your patch (+/- Hui Zhu's pending
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bfd_check_format_matches) as the patch below is its natural extension.
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Sorry for the delay,
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Jan
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2010-01-25 Jan Kratochvil <jan.kratochvil@redhat.com>
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* exceptions.h (enum errors <IS_CORE_ERROR>): New.
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* exec.c: Include exceptions.h.
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(exec_file_attach <bfd_core>): Call throw_error (IS_CORE_ERROR, ...).
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* main.c (exec_or_core_file_attach): New.
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(captured_main <optind < argc>): Set also corearg.
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(captured_main <strcmp (execarg, symarg) == 0>): New variable func.
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Call exec_or_core_file_attach if COREARG matches EXECARG. Call
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symbol_file_add_main only if CORE_BFD remained NULL.
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Http://sourceware.org/ml/gdb-patches/2010-01/msg00517.html
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2010-01-20 Doug Evans <dje@google.com>
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* exec.c (exec_file_attach): Print a more useful error message if the
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user did "gdb core".
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Index: gdb-7.2.50.20110218/gdb/exceptions.h
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===================================================================
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--- gdb-7.2.50.20110218.orig/gdb/exceptions.h 2011-02-14 12:35:44.000000000 +0100
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+++ gdb-7.2.50.20110218/gdb/exceptions.h 2011-02-18 10:45:31.000000000 +0100
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@@ -85,6 +85,9 @@ enum errors {
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traceframe. */
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NOT_AVAILABLE_ERROR,
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+ /* Attempt to load a core file as executable. */
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+ IS_CORE_ERROR,
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+
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/* Add more errors here. */
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NR_ERRORS
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};
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Index: gdb-7.2.50.20110218/gdb/exec.c
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===================================================================
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--- gdb-7.2.50.20110218.orig/gdb/exec.c 2011-02-14 23:08:48.000000000 +0100
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+++ gdb-7.2.50.20110218/gdb/exec.c 2011-02-18 10:45:16.000000000 +0100
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@@ -34,6 +34,7 @@
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#include "arch-utils.h"
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#include "gdbthread.h"
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#include "progspace.h"
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+#include "exceptions.h"
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#include <fcntl.h>
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#include "readline/readline.h"
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@@ -253,12 +254,27 @@ exec_file_attach (char *filename, int fr
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if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching))
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{
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+ int is_core;
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+
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+ /* If the user accidentally did "gdb core", print a useful
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+ error message. Check it only after bfd_object has been checked as
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+ a valid executable may get recognized for example also as
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+ "trad-core". */
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+ is_core = bfd_check_format (exec_bfd, bfd_core);
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+
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/* Make sure to close exec_bfd, or else "run" might try to use
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it. */
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exec_close ();
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- error (_("\"%s\": not in executable format: %s"),
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- scratch_pathname,
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- gdb_bfd_errmsg (bfd_get_error (), matching));
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+
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+ if (is_core != 0)
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+ throw_error (IS_CORE_ERROR,
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+ _("\"%s\" is a core file.\n"
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+ "Please specify an executable to debug."),
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+ scratch_pathname);
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+ else
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+ error (_("\"%s\": not in executable format: %s"),
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+ scratch_pathname,
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+ gdb_bfd_errmsg (bfd_get_error (), matching));
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}
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/* FIXME - This should only be run for RS6000, but the ifdef is a poor
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Index: gdb-7.2.50.20110218/gdb/main.c
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===================================================================
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--- gdb-7.2.50.20110218.orig/gdb/main.c 2011-02-18 10:44:17.000000000 +0100
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+++ gdb-7.2.50.20110218/gdb/main.c 2011-02-18 10:45:16.000000000 +0100
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@@ -243,6 +243,36 @@ captured_command_loop (void *data)
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return 1;
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}
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+/* Call exec_file_attach. If it detected FILENAME is a core file call
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+ core_file_command. Print the original exec_file_attach error only if
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+ core_file_command failed to find a matching executable. */
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+
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+static void
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+exec_or_core_file_attach (char *filename, int from_tty)
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+{
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+ volatile struct gdb_exception e;
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+
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+ gdb_assert (exec_bfd == NULL);
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+
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+ TRY_CATCH (e, RETURN_MASK_ALL)
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+ {
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+ exec_file_attach (filename, from_tty);
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+ }
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+ if (e.reason < 0)
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+ {
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+ if (e.error == IS_CORE_ERROR)
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+ {
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+ core_file_command (filename, from_tty);
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+
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+ /* Iff the core file found its executable suppress the error message
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+ from exec_file_attach. */
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+ if (exec_bfd != NULL)
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+ return;
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+ }
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+ throw_exception (e);
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+ }
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+}
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+
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static int
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captured_main (void *data)
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{
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@@ -727,6 +757,8 @@ captured_main (void *data)
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{
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symarg = argv[optind];
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execarg = argv[optind];
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+ if (optind + 1 == argc && corearg == NULL)
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+ corearg = argv[optind];
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optind++;
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}
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@@ -868,11 +900,25 @@ captured_main (void *data)
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&& symarg != NULL
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&& strcmp (execarg, symarg) == 0)
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{
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+ catch_command_errors_ftype *func;
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+
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+ /* Call exec_or_core_file_attach only if the file was specified as
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+ a command line argument (and not an a command line option). */
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+ if (corearg != NULL && strcmp (corearg, execarg) == 0)
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+ {
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+ func = exec_or_core_file_attach;
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+ corearg = NULL;
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+ }
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+ else
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+ func = exec_file_attach;
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+
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/* The exec file and the symbol-file are the same. If we can't
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open it, better only print one error message.
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- catch_command_errors returns non-zero on success! */
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- if (catch_command_errors (exec_file_attach, execarg,
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- !batch_flag, RETURN_MASK_ALL))
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+ catch_command_errors returns non-zero on success!
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+ Do not load EXECARG as a symbol file if it has been already processed
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+ as a core file. */
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+ if (catch_command_errors (func, execarg, !batch_flag, RETURN_MASK_ALL)
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+ && core_bfd == NULL)
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catch_command_errors (symbol_file_add_main, symarg,
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!batch_flag, RETURN_MASK_ALL);
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}
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