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RFC: GDB as a loader 3/3: --eval-command option
- From: Andrew STUBBS <andrew dot stubbs at st dot com>
- To: gdb at sources dot redhat dot com
- Date: Tue, 18 Oct 2005 12:32:01 +0100
- Subject: RFC: GDB as a loader 3/3: --eval-command option
Hi all,
The attached patch implements a new option --eval-command (-ex for
short) which works similarly to the --command option except that it
passes the command itself, rather than a file name containing commands.
In most cases, this eliminates the need for temporary files or messing
around with stdin when running programs via the debugger.
For example:
gdb hello.exe --batch -ex 'target sim' -ex load -ex run
This option may be used in conjunction with the existing --command (-x)
command and the order of the options is honoured.
It is still necessary to use a script file if define/if/while, or any
other nested construct, is required. Suggestions on how to deal with
this would be welcome.
Note that the patch assumes that the batch-silent and
return-child-result patches have already been applied (although the
implementation in no way depends on those features).
Thanks
Andrew Stubbs
2005-10-18 Andrew Stubbs <andrew.stubbs@st.com>
* main.c (captured_main): Define struct cmdarg. Change type of cmdarg.
Add new options --eval-command and alias -ex.
Adjust --command to use the new struct cmdarg.
Execute commands given with --eval-command.
(print_gdb_help): Add new options --eval-command, -ex and mention -x.
Index: src/gdb/main.c
===================================================================
--- src.orig/gdb/main.c 2005-10-18 09:57:29.000000000 +0100
+++ src/gdb/main.c 2005-10-18 10:14:27.000000000 +0100
@@ -138,7 +138,13 @@ captured_main (void *data)
static int print_version;
/* Pointers to all arguments of --command option. */
- char **cmdarg;
+ struct cmdarg {
+ enum {
+ CMDARG_FILE,
+ CMDARG_COMMAND
+ } type;
+ char *string;
+ } *cmdarg;
/* Allocated size of cmdarg. */
int cmdsize;
/* Number of elements of cmdarg used. */
@@ -178,7 +184,7 @@ captured_main (void *data)
#endif
cmdsize = 1;
- cmdarg = (char **) xmalloc (cmdsize * sizeof (*cmdarg));
+ cmdarg = (struct cmdarg *) xmalloc (cmdsize * sizeof (*cmdarg));
ncmd = 0;
dirsize = 1;
dirarg = (char **) xmalloc (dirsize * sizeof (*dirarg));
@@ -285,8 +291,10 @@ captured_main (void *data)
{"pid", required_argument, 0, 'p'},
{"p", required_argument, 0, 'p'},
{"command", required_argument, 0, 'x'},
+ {"eval-command", required_argument, 0, 'X'},
{"version", no_argument, &print_version, 1},
{"x", required_argument, 0, 'x'},
+ {"ex", required_argument, 0, 'X'},
#ifdef GDBTK
{"tclcommand", required_argument, 0, 'z'},
{"enable-external-editor", no_argument, 0, 'y'},
@@ -387,12 +395,23 @@ captured_main (void *data)
corearg = optarg;
break;
case 'x':
- cmdarg[ncmd++] = optarg;
+ cmdarg[ncmd].type = CMDARG_FILE;
+ cmdarg[ncmd++].string = optarg;
+ if (ncmd >= cmdsize)
+ {
+ cmdsize *= 2;
+ cmdarg = xrealloc ((char *) cmdarg,
+ cmdsize * sizeof (*cmdarg));
+ }
+ break;
+ case 'X':
+ cmdarg[ncmd].type = CMDARG_COMMAND;
+ cmdarg[ncmd++].string = optarg;
if (ncmd >= cmdsize)
{
cmdsize *= 2;
- cmdarg = (char **) xrealloc ((char *) cmdarg,
- cmdsize * sizeof (*cmdarg));
+ cmdarg = xrealloc ((char *) cmdarg,
+ cmdsize * sizeof (*cmdarg));
}
break;
case 'B':
@@ -733,7 +752,12 @@ extern int gdbtk_test (char *);
do_cleanups (ALL_CLEANUPS);
}
#endif
- catch_command_errors (source_command, cmdarg[i], !batch, RETURN_MASK_ALL);
+ if (cmdarg[i].type == CMDARG_FILE)
+ catch_command_errors (source_command, cmdarg[i].string,
+ !batch, RETURN_MASK_ALL);
+ else /* cmdarg[i].type == CMDARG_COMMAND */
+ catch_command_errors (execute_command, cmdarg[i].string,
+ !batch, RETURN_MASK_ALL);
}
xfree (cmdarg);
@@ -846,7 +870,11 @@ Options:\n\n\
--return-child-result\n\
GDB exit code will be the child's exit code.\n\
--cd=DIR Change current directory to DIR.\n\
- --command=FILE Execute GDB commands from FILE.\n\
+ --command=FILE, -x Execute GDB commands from FILE.\n\
+ --eval-command=COMMAND, -ex\n\
+ Execute a single GDB command.\n\
+ May be used multiple times and in conjunction\n\
+ with --command.\n\
--core=COREFILE Analyze the core dump COREFILE.\n\
--pid=PID Attach to running process PID.\n\
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