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target: use correct target in target-prefixed commands and event handlers

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This change contains an alternative to Matthias Welwarsky's #4130
(target-prefixed commands) and to #4293 (event handlers).

get_current_target() must retrieve the target associated to the current
command. If no target associated, the current target of the command
context is used as a fallback.

Many Tcl event handlers work with the current target as if it were
the target issuing the event.

current_target in command_context is a number and has to be converted
to a pointer in every get_current_target() call.

The solution:
- Replace current_target in command_context by a target pointer
- Add another target pointer current_target_override
- get_current_target() returns current_target_override if set, otherwise
	current_target
- Save, set and restore current_target_override to the current prefix
	in run_command()
- Save, set and restore current_target_override to the event invoking
	target in target_handle_event()

While on it use calloc when allocating a new command_context.

Change-Id: I9a82102e94dcac063743834a1d28da861b2e74ea
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Suggested-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Reviewed-on: http://openocd.zylin.com/4295
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>
This commit is contained in:
Tomas Vanek
2017-11-21 22:57:39 +01:00
committed by Matthias Welwarsky
parent eaeb4191e5
commit bb9d9c6026
5 changed files with 58 additions and 12 deletions
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24
src/helper/command.c
View File

@@ -608,7 +608,23 @@ static int run_command(struct command_context *context,
.argc = num_words - 1,
.argv = words + 1,
};
/* Black magic of overridden current target:
* If the command we are going to handle has a target prefix,
* override the current target temporarily for the time
* of processing the command.
* current_target_override is used also for event handlers
* therefore we prevent touching it if command has no prefix.
* Previous override is saved and restored back to ensure
* correct work when run_command() is re-entered. */
struct target *saved_target_override = context->current_target_override;
if (c->jim_handler_data)
context->current_target_override = c->jim_handler_data;
int retval = c->handler(&cmd);
if (c->jim_handler_data)
context->current_target_override = saved_target_override;
if (retval == ERROR_COMMAND_SYNTAX_ERROR) {
/* Print help for command */
char *full_name = command_name(c, ' ');
@@ -643,6 +659,8 @@ int command_run_line(struct command_context *context, char *line)
* happen when the Jim Tcl interpreter is provided by eCos for
* instance.
*/
context->current_target_override = NULL;
Jim_Interp *interp = context->interp;
Jim_DeleteAssocData(interp, "context");
retcode = Jim_SetAssocData(interp, "context", NULL, context);
@@ -1269,14 +1287,10 @@ static const struct command_registration command_builtin_handlers[] = {
struct command_context *command_init(const char *startup_tcl, Jim_Interp *interp)
{
struct command_context *context = malloc(sizeof(struct command_context));
struct command_context *context = calloc(1, sizeof(struct command_context));
const char *HostOs;
context->mode = COMMAND_EXEC;
context->commands = NULL;
context->current_target = 0;
context->output_handler = NULL;
context->output_handler_priv = NULL;
/* Create a jim interpreter if we were not handed one */
if (interp == NULL) {

15
src/helper/command.h
View File

@@ -49,7 +49,15 @@ struct command_context {
Jim_Interp *interp;
enum command_mode mode;
struct command *commands;
int current_target;
struct target *current_target;
/* The target set by 'targets xx' command or the latest created */
struct target *current_target_override;
/* If set overrides current_target
* It happens during processing of
* 1) a target prefixed command
* 2) an event handler
* Pay attention to reentrancy when setting override.
*/
command_output_handler_t output_handler;
void *output_handler_priv;
};
@@ -168,6 +176,11 @@ struct command {
command_handler_t handler;
Jim_CmdProc *jim_handler;
void *jim_handler_data;
/* Currently used only for target of target-prefixed cmd.
* Native OpenOCD commands use jim_handler_data exclusively
* as a target override.
* Jim handlers outside of target cmd tree can use
* jim_handler_data for any handler specific data */
enum command_mode mode;
struct command *next;
};