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2000-11-06 Fernando Nasser <fnasser@cygnus.com>

Browse Source 
From  Steven Johnson  <sbjohnson@ozemail.com.au>:

        This set of changes add "hookpost-" as an expansion on the original
        hooking of commands to GDB. A Hook may now be run "AFTER" execution of
        a command as well as before.

        * command.h (struct cmd_list_element): Changed elements hook and hookee
        to hook_pre and hookee_pre respectively. Added hook_post and hookee_post
        for the post hook command operation. Added hook_in so that an executing
        hook can be flagged to prevent recursion.
        * command.c (add_cmd): Changed initilization of cmd_list_element to
        reflect above changes.
        (delete_cmd): Remove both pre and post hooks.
        (help_cmd): Notify that the command has pre and/or post hooks.
        * infrun.c (normal_stop): Change references to hook_pre from hook.
        * top.c (execute_command): Run both pre and post hooks.
        (define_command): Allow definition of both pre and post hooks.
        The definition of pre-hooks is done as before, with the "hook-"
        prefix for backward compatibility.
This commit is contained in:
Fernando Nasser 2000-11-06 22:44:34 +00:00
parent 7152f1dc45
commit 73bc900df9
5 changed files with 121 additions and 23 deletions
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22
gdb/ChangeLog
View File

@ -1,3 +1,25 @@
2000-11-06 Fernando Nasser <fnasser@cygnus.com>
From Steven Johnson <sbjohnson@ozemail.com.au>:
This set of changes add "hookpost-" as an expansion on the original
hooking of commands to GDB. A Hook may now be run "AFTER" execution of
a command as well as before.
* command.h (struct cmd_list_element): Changed elements hook and hookee
to hook_pre and hookee_pre respectively. Added hook_post and hookee_post
for the post hook command operation. Added hook_in so that an executing
hook can be flagged to prevent recursion.
* command.c (add_cmd): Changed initilization of cmd_list_element to
reflect above changes.
(delete_cmd): Remove both pre and post hooks.
(help_cmd): Notify that the command has pre and/or post hooks.
* infrun.c (normal_stop): Change references to hook_pre from hook.
* top.c (execute_command): Run both pre and post hooks.
(define_command): Allow definition of both pre and post hooks.
The definition of pre-hooks is done as before, with the "hook-"
prefix for backward compatibility.
2000-11-06 Peter Schauer <pes@regent.e-technik.tu-muenchen.de>
* stack.c (return_command): Pop dummy frame if we just returned from

35
gdb/command.c
View File

@ -112,7 +112,9 @@ add_cmd (char *name, enum command_class class, void (*fun) (char *, int),
c->doc = doc;
c->flags = 0;
c->replacement = NULL;
c->hook = NULL;
c->hook_pre = NULL;
c->hook_post = NULL;
c->hook_in = 0;
c->prefixlist = NULL;
c->prefixname = NULL;
c->allow_unknown = 0;
@ -123,7 +125,8 @@ add_cmd (char *name, enum command_class class, void (*fun) (char *, int),
c->var_type = var_boolean;
c->enums = NULL;
c->user_commands = NULL;
c->hookee = NULL;
c->hookee_pre = NULL;
c->hookee_post = NULL;
c->cmd_pointer = NULL;
return c;
@ -366,8 +369,10 @@ delete_cmd (char *name, struct cmd_list_element **list)
while (*list && STREQ ((*list)->name, name))
{
if ((*list)->hookee)
(*list)->hookee->hook = 0; /* Hook slips out of its mouth */
if ((*list)->hookee_pre)
(*list)->hookee_pre->hook_pre = 0; /* Hook slips out of its mouth */
if ((*list)->hookee_post)
(*list)->hookee_post->hook_post = 0; /* Hook slips out of its bottom */
p = (*list)->next;
free ((PTR) * list);
*list = p;
@ -378,8 +383,11 @@ delete_cmd (char *name, struct cmd_list_element **list)
{
if (STREQ (c->next->name, name))
{
if (c->next->hookee)
c->next->hookee->hook = 0; /* hooked cmd gets away. */
if (c->next->hookee_pre)
c->next->hookee_pre->hook_pre = 0; /* hooked cmd gets away. */
if (c->next->hookee_post)
c->next->hookee_post->hook_post = 0; /* remove post hook */
/* :( no fishing metaphore */
p = c->next->next;
free ((PTR) c->next);
c->next = p;
@ -531,9 +539,18 @@ help_cmd (char *command, struct ui_file *stream)
if (c->function.cfunc == NULL)
help_list (cmdlist, "", c->class, stream);
if (c->hook)
fprintf_filtered (stream, "\nThis command has a hook defined: %s\n",
c->hook->name);
if (c->hook_pre || c->hook_post)
fprintf_filtered (stream,
"\nThis command has a hook (or hooks) defined:\n");
if (c->hook_pre)
fprintf_filtered (stream,
"\tThis command is run after : %s (pre hook)\n",
c->hook_pre->name);
if (c->hook_post)
fprintf_filtered (stream,
"\tThis command is run before : %s (post hook)\n",
c->hook_post->name);
}
/*

17
gdb/command.h
View File

@ -165,7 +165,14 @@ struct cmd_list_element
char *replacement;
/* Hook for another command to be executed before this command. */
struct cmd_list_element *hook;
struct cmd_list_element *hook_pre;
/* Hook for another command to be executed after this command. */
struct cmd_list_element *hook_post;
/* Flag that specifies if this command is already running it's hook. */
/* Prevents the possibility of hook recursion. */
int hook_in;
/* Nonzero identifies a prefix command. For them, the address
of the variable containing the list of subcommands. */
@ -220,9 +227,13 @@ struct cmd_list_element
/* Pointer to command strings of user-defined commands */
struct command_line *user_commands;
/* Pointer to command that is hooked by this one,
/* Pointer to command that is hooked by this one, (by hook_pre)
so the hook can be removed when this one is deleted. */
struct cmd_list_element *hookee;
struct cmd_list_element *hookee_pre;
/* Pointer to command that is hooked by this one, (by hook_post)
so the hook can be removed when this one is deleted. */
struct cmd_list_element *hookee_post;
/* Pointer to command that is aliased by this one, so the
aliased command can be located in case it has been hooked. */

4
gdb/infrun.c
View File

@ -3446,9 +3446,9 @@ and/or watchpoints.\n");
/* Look up the hook_stop and run it if it exists. */
if (stop_command && stop_command->hook)
if (stop_command && stop_command->hook_pre)
{
catch_errors (hook_stop_stub, stop_command->hook,
catch_errors (hook_stop_stub, stop_command->hook_pre,
"Error while running hook_stop:\n", RETURN_MASK_ALL);
}

66
gdb/top.c
View File

@ -1500,9 +1500,13 @@ extern void serial_log_command (const char *);
*(p + 1) = '\0';
}
/* If this command has been hooked, run the hook first. */
if (c->hook)
execute_user_command (c->hook, (char *) 0);
/* If this command has been pre-hooked, run the hook first. */
if ((c->hook_pre) && (!c->hook_in))
{
c->hook_in = 1; /* Prevent recursive hooking */
execute_user_command (c->hook_pre, (char *) 0);
c->hook_in = 0; /* Allow hook to work again once it is complete */
}
if (c->flags & DEPRECATED_WARN_USER)
deprecated_cmd_warning (&line);
@ -1517,6 +1521,15 @@ extern void serial_log_command (const char *);
call_command_hook (c, arg, from_tty & caution);
else
(*c->function.cfunc) (arg, from_tty & caution);
/* If this command has been post-hooked, run the hook last. */
if ((c->hook_post) && (!c->hook_in))
{
c->hook_in = 1; /* Prevent recursive hooking */
execute_user_command (c->hook_post, (char *) 0);
c->hook_in = 0; /* allow hook to work again once it is complete */
}
}
/* Tell the user if the language has changed (except first time). */
@ -2988,12 +3001,25 @@ user_defined_command (char *ignore, int from_tty)
static void
define_command (char *comname, int from_tty)
{
#define MAX_TMPBUF 128
enum cmd_hook_type
{
CMD_NO_HOOK = 0,
CMD_PRE_HOOK,
CMD_POST_HOOK
};
register struct command_line *cmds;
register struct cmd_list_element *c, *newc, *hookc = 0;
register struct cmd_list_element *c, *newc, *oldc, *hookc = 0;
char *tem = comname;
char tmpbuf[128];
char *tem2;
char tmpbuf[MAX_TMPBUF];
int hook_type = CMD_NO_HOOK;
int hook_name_size = 0;
#define HOOK_STRING "hook-"
#define HOOK_LEN 5
#define HOOK_POST_STRING "hookpost-"
#define HOOK_POST_LEN 9
validate_comname (comname);
@ -3017,11 +3043,22 @@ define_command (char *comname, int from_tty)
we can hook the `stop' pseudo-command. */
if (!strncmp (comname, HOOK_STRING, HOOK_LEN))
{
hook_type = CMD_PRE_HOOK;
hook_name_size = HOOK_LEN;
}
else if (!strncmp (comname, HOOK_POST_STRING, HOOK_POST_LEN))
{
hook_type = CMD_POST_HOOK;
hook_name_size = HOOK_POST_LEN;
}
if (hook_type != CMD_NO_HOOK)
{
/* Look up cmd it hooks, and verify that we got an exact match. */
tem = comname + HOOK_LEN;
tem = comname + hook_name_size;
hookc = lookup_cmd (&tem, cmdlist, "", -1, 0);
if (hookc && !STREQ (comname + HOOK_LEN, hookc->name))
if (hookc && !STREQ (comname + hook_name_size, hookc->name))
hookc = 0;
if (!hookc)
{
@ -3055,8 +3092,19 @@ define_command (char *comname, int from_tty)
tied. */
if (hookc)
{
hookc->hook = newc; /* Target gets hooked. */
newc->hookee = hookc; /* We are marked as hooking target cmd. */
switch (hook_type)
{
case CMD_PRE_HOOK:
hookc->hook_pre = newc; /* Target gets hooked. */
newc->hookee_pre = hookc; /* We are marked as hooking target cmd. */
break;
case CMD_POST_HOOK:
hookc->hook_pre = newc; /* Target gets hooked. */
newc->hookee_pre = hookc; /* We are marked as hooking target cmd. */
break;
default:
/* Should never come here as hookc would be 0. */
}
}
}