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command.y
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command.y
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/*
* command.y - yacc/bison parser for debugger commands.
*/
/*
* Copyright (C) 2004, 2010, 2011 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
%{
#include "awk.h"
#include "cmd.h"
#if 0
#define YYDEBUG 12
int yydebug = 2;
#endif
static int yylex(void);
static void yyerror(const char *mesg, ...);
static int find_command(const char *token, size_t toklen);
static bool want_nodeval = false;
static int cmd_idx = -1; /* index of current command in cmd table */
static int repeat_idx = -1; /* index of last repeatable command in command table */
static CMDARG *arg_list = NULL; /* list of arguments */
static long errcount = 0;
static char *lexptr_begin = NULL;
static bool in_commands = false;
static int num_dim;
static bool in_eval = false;
static const char start_EVAL[] = "function @eval(){";
static const char end_EVAL[] = "}";
static CMDARG *append_statement(CMDARG *stmt_list, char *stmt);
static char *next_word(char *p, int len, char **endp);
static NODE *concat_args(CMDARG *a, int count);
#ifdef HAVE_LIBREADLINE
static void history_expand_line(char **line);
static char *command_generator(const char *text, int state);
static char *srcfile_generator(const char *text, int state);
static char *argument_generator(const char *text, int state);
static char *variable_generator(const char *text, int state);
extern char *option_generator(const char *text, int state);
static int this_cmd = D_illegal;
#else
#define history_expand_line(p) /* nothing */
static int rl_inhibit_completion; /* dummy variable */
#endif
struct argtoken {
const char *name;
enum argtype cmd;
enum nametypeval value;
};
/*
* These two should be static, but there are some compilers that
* don't like the static keyword with an empty size. Therefore give
* them names that are less likely to conflict with the rest of gawk.
*/
#define argtab zz_debug_argtab
#define cmdtab zz_debug_cmdtab
extern struct argtoken argtab[];
extern struct cmdtoken cmdtab[];
static CMDARG *mk_cmdarg(enum argtype type);
static void append_cmdarg(CMDARG *arg);
static int find_argument(CMDARG *arg);
#define YYSTYPE CMDARG *
%}
%token D_BACKTRACE D_BREAK D_CLEAR D_CONTINUE D_DELETE D_DISABLE D_DOWN
%token D_ENABLE D_FINISH D_FRAME D_HELP D_IGNORE D_INFO D_LIST
%token D_NEXT D_NEXTI D_PRINT D_PRINTF D_QUIT D_RETURN D_RUN D_SET
%token D_STEP D_STEPI D_TBREAK D_UP D_UNTIL
%token D_DISPLAY D_UNDISPLAY D_WATCH D_UNWATCH
%token D_DUMP D_TRACE
%token D_INT D_STRING D_NODE D_VARIABLE
%token D_OPTION D_COMMANDS D_END D_SILENT D_SOURCE
%token D_SAVE D_EVAL D_CONDITION
%token D_STATEMENT
%%
input
: /* empty */
| input line
{
cmd_idx = -1;
want_nodeval = false;
if (lexptr_begin != NULL) {
if (input_from_tty && lexptr_begin[0] != '\0')
add_history(lexptr_begin);
efree(lexptr_begin);
lexptr_begin = NULL;
}
if (arg_list != NULL) {
free_cmdarg(arg_list);
arg_list = NULL;
}
}
;
line
: nls
| command nls
{
if (errcount == 0 && cmd_idx >= 0) {
Func_cmd cmdfunc;
bool terminate = false;
CMDARG *args;
int ctype = 0;
ctype = cmdtab[cmd_idx].type;
/* a blank line repeats previous command
* (list, next, nexti, step, stepi and continue without arguments).
* save the index in the command table; used in yylex
*/
if ((ctype == D_list
|| ctype == D_next
|| ctype == D_step
|| ctype == D_nexti
|| ctype == D_stepi
|| ctype == D_continue)
&& arg_list == NULL
&& ! in_commands
&& input_from_tty
)
repeat_idx = cmd_idx;
else
repeat_idx = -1;
/* call the command handler; reset the globals arg_list, cmd_idx,
* since this handler could invoke yyparse again.
* call do_commands for the list of commands in `commands';
* arg_list isn't freed on return.
*/
cmdfunc = cmdtab[cmd_idx].cf_ptr;
if (in_commands)
cmdfunc = do_commands;
cmd_idx = -1;
want_nodeval = false;
args = arg_list;
arg_list = NULL;
terminate = (*cmdfunc)(args, ctype);
if (! in_commands || ctype == D_commands)
free_cmdarg(args);
if (terminate)
YYACCEPT;
}
}
| error nls
{
yyerrok;
}
;
control_cmd
: D_CONTINUE
| D_NEXT
| D_NEXTI
| D_STEP
| D_STEPI
;
d_cmd
: D_UNDISPLAY
| D_UNWATCH
| D_DISABLE
| D_DELETE
;
frame_cmd
: D_UP
| D_DOWN
| D_BACKTRACE
| D_FRAME
;
break_cmd
: D_BREAK
| D_TBREAK
;
/* mid-rule action buried in non-terminal to avoid conflict */
set_want_nodeval
: { want_nodeval = true; }
;
eval_prologue
: D_EVAL set_want_nodeval opt_param_list nls
{
if (errcount == 0) {
/* don't free arg_list; passed on to statement_list
* non-terminal (empty rule action). See below.
*/
if (input_from_tty) {
dbg_prompt = eval_prompt;
fprintf(out_fp,
_("Type (g)awk statement(s). End with the command \"end\"\n"));
rl_inhibit_completion = 1;
}
cmd_idx = -1;
in_eval = true;
}
}
;
statement_list
: /* empty */
{
$$ = append_statement(arg_list, (char *) start_EVAL);
if (read_a_line == read_commands_string) /* unserializing 'eval' in 'commands' */
$$->a_string[0] = '\0';
free_cmdarg(arg_list);
arg_list = NULL;
}
| statement_list D_STATEMENT { $$ = append_statement($1, lexptr_begin); } nls
{
$$ = $3;
}
;
eval_cmd
: eval_prologue statement_list D_END
{
arg_list = append_statement($2, (char *) end_EVAL);
if (read_a_line == read_commands_string) { /* unserializing 'eval' in 'commands' */
char *str = arg_list->a_string;
size_t len = strlen(str);
assert(len > 2 && str[len - 2] == '}');
str[len - 2] = '\0';
}
if (input_from_tty) {
dbg_prompt = in_commands ? commands_prompt : dgawk_prompt;
rl_inhibit_completion = 0;
}
cmd_idx = find_command("eval", 4);
in_eval = false;
}
| D_EVAL set_want_nodeval string_node
{
NODE *n;
CMDARG *arg;
n = $3->a_node;
arg = append_statement(NULL, (char *) start_EVAL);
(void) append_statement(arg, n->stptr);
(void) append_statement(arg, (char *) end_EVAL);
free_cmdarg(arg_list);
arg_list = arg;
}
;
command
: D_HELP help_args
| D_QUIT
| D_RUN
| D_FINISH
| control_cmd opt_plus_integer
| frame_cmd opt_integer
{
if (cmdtab[cmd_idx].class == D_FRAME
&& $2 != NULL && $2->a_int < 0)
yyerror(_("invalid frame number: %d"), $2->a_int);
}
| D_INFO D_STRING
{
int idx = find_argument($2);
if (idx < 0)
yyerror(_("info: invalid option - \"%s\""), $2->a_string);
else {
efree($2->a_string);
$2->a_string = NULL;
$2->type = D_argument;
$2->a_argument = argtab[idx].value;
}
}
| D_IGNORE plus_integer D_INT
| D_ENABLE enable_args
| D_PRINT { want_nodeval = true; } print_args
| D_PRINTF { want_nodeval = true; } printf_args
| D_LIST list_args
| D_UNTIL location
| D_CLEAR location
| break_cmd break_args
| D_SET { want_nodeval = true; } variable '=' node
| D_OPTION option_args
| D_RETURN { want_nodeval = true; } opt_node
| D_DISPLAY { want_nodeval = true; } opt_variable
| D_WATCH { want_nodeval = true; } variable condition_exp
| d_cmd opt_integer_list
| D_DUMP opt_string
| D_SOURCE D_STRING
{
if (in_cmd_src($2->a_string))
yyerror(_("source \"%s\": already sourced."), $2->a_string);
}
| D_SAVE D_STRING
{
if (! input_from_tty)
yyerror(_("save \"%s\": command not permitted."), $2->a_string);
}
| D_COMMANDS commands_arg
{
int type = 0;
int num;
if ($2 != NULL)
num = $2->a_int;
if (errcount != 0)
;
else if (in_commands)
yyerror(_("Can't use command `commands' for breakpoint/watchpoint commands"));
else if ($2 == NULL && ! (type = has_break_or_watch_point(&num, true)))
yyerror(_("no breakpoint/watchpoint has been set yet"));
else if ($2 != NULL && ! (type = has_break_or_watch_point(&num, false)))
yyerror(_("invalid breakpoint/watchpoint number"));
if (type) {
in_commands = true;
if (input_from_tty) {
dbg_prompt = commands_prompt;
fprintf(out_fp, _("Type commands for when %s %d is hit, one per line.\n"),
(type == D_break) ? "breakpoint" : "watchpoint", num);
fprintf(out_fp, _("End with the command \"end\"\n"));
}
}
}
| D_END
{
if (! in_commands)
yyerror(_("`end' valid only in command `commands' or `eval'"));
else {
if (input_from_tty)
dbg_prompt = dgawk_prompt;
in_commands = false;
}
}
| D_SILENT
{
if (! in_commands)
yyerror(_("`silent' valid only in command `commands'"));
}
| D_TRACE D_STRING
{
int idx = find_argument($2);
if (idx < 0)
yyerror(_("trace: invalid option - \"%s\""), $2->a_string);
else {
efree($2->a_string);
$2->a_string = NULL;
$2->type = D_argument;
$2->a_argument = argtab[idx].value;
}
}
| D_CONDITION plus_integer { want_nodeval = true; } condition_exp
{
int type;
int num = $2->a_int;
type = has_break_or_watch_point(&num, false);
if (! type)
yyerror(_("condition: invalid breakpoint/watchpoint number"));
}
| eval_cmd
{
if (in_commands) {
/* Prepend command 'eval' to argument list */
CMDARG *arg;
arg = mk_cmdarg(D_string);
arg->a_string = estrdup("eval", 4);
arg->next = arg_list;
arg_list = arg;
}
}
;
condition_exp
: opt_string_node
{
if ($1 != NULL) {
NODE *n = $1->a_node;
$1->type = D_string;
$1->a_string = n->stptr;
freenode(n);
}
$$ = $1;
}
;
commands_arg
: opt_plus_integer
| error
{ $$ = NULL; }
;
opt_param_list
: /* empty */
{ $$ = NULL; }
| param_list
;
param_list
: D_VARIABLE
| param_list D_VARIABLE
| param_list ',' D_VARIABLE
| error
{ $$ = NULL; }
;
opt_string_node
: /* empty */
{ $$ = NULL; }
| string_node
| error
{ $$ = NULL; }
;
string_node
: D_NODE
{
NODE *n;
n = $1->a_node;
if ((n->flags & STRING) == 0)
yyerror(_("argument not a string"));
}
;
option_args
: /* empty */
{ $$ = NULL; }
| D_STRING
{
if (find_option($1->a_string) < 0)
yyerror(_("option: invalid parameter - \"%s\""), $1->a_string);
}
| D_STRING '=' D_STRING
{
if (find_option($1->a_string) < 0)
yyerror(_("option: invalid parameter - \"%s\""), $1->a_string);
}
;
func_name
: D_STRING
{
NODE *n;
n = lookup($1->a_string);
if (n == NULL || n->type != Node_func)
yyerror(_("no such function - \"%s\""), $1->a_string);
else {
$1->type = D_func;
efree($1->a_string);
$1->a_string = NULL;
$1->a_node = n;
}
}
;
location
: /* empty */
{ $$ = NULL; }
| plus_integer
| func_name
| D_STRING ':' plus_integer
| D_STRING ':' func_name
;
break_args
: /* empty */
{ $$ = NULL; }
| plus_integer { want_nodeval = true; } condition_exp
| func_name
| D_STRING ':' plus_integer { want_nodeval = true; } condition_exp
| D_STRING ':' func_name
;
opt_variable
: /* empty */
{ $$ = NULL; }
| variable
;
opt_string
: /* empty */
{ $$ = NULL; }
| D_STRING
;
opt_node
: /* empty */
{ $$ = NULL; }
| node
;
help_args
: /* empty */
| D_STRING
;
enable_args
: opt_integer_list
| D_STRING opt_integer_list
{
int idx = find_argument($1);
if (idx < 0)
yyerror(_("enable: invalid option - \"%s\""), $1->a_string);
else {
efree($1->a_string);
$1->a_string = NULL;
$1->type = D_argument;
$1->a_argument = argtab[idx].value;
}
}
;
print_exp
: variable
| '@' D_VARIABLE
{
$2->type = D_array; /* dump all items */
$2->a_count = 0;
}
| '@' D_VARIABLE subscript_list /* dump sub-array items*/
{
$2->type = D_array;
$2->a_count = num_dim;
}
;
print_args
: print_exp
| print_args print_exp
| print_args ',' print_exp
| error
;
printf_exp
: D_NODE
| variable
;
printf_args
: printf_exp
| printf_args ',' printf_exp
| error
;
list_args
: /* empty */
{ $$ = NULL; }
| '+'
{ $$ = NULL; }
| '-'
{
CMDARG *a;
a = mk_cmdarg(D_int);
a->a_int = -1;
append_cmdarg(a);
}
| plus_integer
| func_name
| integer_range
| D_STRING ':' plus_integer
| D_STRING ':' func_name
| D_STRING ':' integer_range
;
integer_range
: plus_integer '-' plus_integer
{
if ($1->a_int > $3->a_int)
yyerror(_("invalid range specification: %d - %d"),
$1->a_int, $3->a_int);
else
$1->type = D_range;
$$ = $1;
}
;
opt_integer_list
: /* empty */
{ $$ = NULL; }
| integer_list
| error
;
integer_list
: plus_integer
| integer_range
| integer_list plus_integer
| integer_list integer_range
;
exp_list
: node
{ $$ = $1; }
| exp_list ',' node
{ $$ = $1; }
| error
;
subscript
: '[' exp_list ']'
{
CMDARG *a;
NODE *subs;
int count = 0;
for (a = $2; a != NULL; a = a->next)
count++;
subs = concat_args($2, count);
free_cmdarg($2->next);
$2->next = NULL;
$2->type = D_node;
$2->a_node = subs;
$$ = $2;
}
| '[' exp_list error
;
subscript_list
: subscript
{ $$ = $1; num_dim = 1; }
| subscript_list subscript
{ $$ = $1; num_dim++; }
;
variable
: D_VARIABLE
| '$' D_NODE
{
NODE *n = $2->a_node;
if ((n->flags & NUMBER) == 0)
yyerror(_("non-numeric value for field number"));
else
$2->type = D_field;
$$ = $2;
}
| D_VARIABLE subscript_list
{
/* a_string is array name, a_count is dimension count */
$1->type = D_subscript;
$1->a_count = num_dim;
$$ = $1;
}
;
node
: D_NODE
{ $$ = $1; }
| '+' D_NODE
{
NODE *n = $2->a_node;
if ((n->flags & NUMBER) == 0)
yyerror(_("non-numeric value found, numeric expected"));
$$ = $2;
}
| '-' D_NODE
{
NODE *n = $2->a_node;
if ((n->flags & NUMBER) == 0)
yyerror(_("non-numeric value found, numeric expected"));
else
negate_num(n);
$$ = $2;
}
;
opt_plus_integer
: /* empty */
{ $$ = NULL; }
| plus_integer
{ $$ = $1; }
;
opt_integer
: /* empty */
{ $$ = NULL; }
| integer
{ $$ = $1; }
;
plus_integer
: D_INT
{
if ($1->a_int == 0)
yyerror(_("non-zero integer value"));
$$ = $1;
}
| '+' D_INT
{
if ($2->a_int == 0)
yyerror(_("non-zero integer value"));
$$ = $2;
}
;
integer
: D_INT
{ $$ = $1; }
| '+' D_INT
{ $$ = $2; }
| '-' D_INT
{
$2->a_int = - $2->a_int;
$$ = $2;
}
;
nls
: '\n'
{
if (lexptr_begin != NULL) {
if (input_from_tty && lexptr_begin[0] != '\0')
add_history(lexptr_begin);
efree(lexptr_begin);
lexptr_begin = NULL;
}
}
;
%%
/* append_statement --- append 'stmt' to the list of eval awk statements */
static CMDARG *
append_statement(CMDARG *stmt_list, char *stmt)
{
CMDARG *a, *arg;
char *s;
int len, slen, ssize;
#define EVALSIZE 512
if (stmt == start_EVAL) {
len = sizeof(start_EVAL);
for (a = stmt_list; a != NULL; a = a->next)
len += strlen(a->a_string) + 1; /* 1 for ',' */
len += EVALSIZE;
emalloc(s, char *, (len + 2) * sizeof(char), "append_statement");
arg = mk_cmdarg(D_string);
arg->a_string = s;
arg->a_count = len; /* kludge */
slen = sizeof("function @eval(") - 1;
memcpy(s, start_EVAL, slen);
for (a = stmt_list; a != NULL; a = a->next) {
len = strlen(a->a_string);
memcpy(s + slen, a->a_string, len);
slen += len;
if (a->next != NULL)
s[slen++] = ',';
}
s[slen++] = ')';
s[slen++] = '{';
s[slen] = '\0';
return arg;
}
len = strlen(stmt) + 1; /* 1 for newline */
s = stmt_list->a_string;
slen = strlen(s);
ssize = stmt_list->a_count;
if (len > ssize - slen) {
ssize = slen + len + EVALSIZE;
erealloc(s, char *, (ssize + 2) * sizeof(char), "append_statement");
stmt_list->a_string = s;
stmt_list->a_count = ssize;
}
memcpy(s + slen, stmt, len);
slen += len;
if (slen >= 2 && s[slen - 2] != '\n') {
s[slen - 1] = '\n';
s[slen] = '\0';
}
if (stmt == end_EVAL)
erealloc(stmt_list->a_string, char *, slen + 2, "append_statement");
return stmt_list;
#undef EVALSIZE
}
/* command names sorted in ascending order */
struct cmdtoken cmdtab[] = {
{ "backtrace", "bt", D_backtrace, D_BACKTRACE, do_backtrace,
gettext_noop("backtrace [N] - print trace of all or N innermost (outermost if N < 0) frames.") },
{ "break", "b", D_break, D_BREAK, do_breakpoint,
gettext_noop("break [[filename:]N|function] - set breakpoint at the specified location.") },
{ "clear", "", D_clear, D_CLEAR, do_clear,
gettext_noop("clear [[filename:]N|function] - delete breakpoints previously set.") },
{ "commands", "", D_commands, D_COMMANDS, do_commands,
gettext_noop("commands [num] - starts a list of commands to be executed at a breakpoint(watchpoint) hit.") },
{ "condition", "", D_condition, D_CONDITION, do_condition,
gettext_noop("condition num [expr] - set or clear breakpoint or watchpoint condition.") },
{ "continue", "c", D_continue, D_CONTINUE, do_continue,
gettext_noop("continue [COUNT] - continue program being debugged.") },
{ "delete", "d", D_delete, D_DELETE, do_delete_breakpoint,
gettext_noop("delete [breakpoints] [range] - delete specified breakpoints.") },
{ "disable", "", D_disable, D_DISABLE, do_disable_breakpoint,
gettext_noop("disable [breakpoints] [range] - disable specified breakpoints.") },
{ "display", "", D_display, D_DISPLAY, do_display,
gettext_noop("display [var] - print value of variable each time the program stops.") },
{ "down", "", D_down, D_DOWN, do_down,
gettext_noop("down [N] - move N frames down the stack.") },
{ "dump", "", D_dump, D_DUMP, do_dump_instructions,
gettext_noop("dump [filename] - dump instructions to file or stdout.") },
{ "enable", "e", D_enable, D_ENABLE, do_enable_breakpoint,
gettext_noop("enable [once|del] [breakpoints] [range] - enable specified breakpoints.") },
{ "end", "", D_end, D_END, do_commands,
gettext_noop("end - end a list of commands or awk statements.") },
{ "eval", "", D_eval, D_EVAL, do_eval,
gettext_noop("eval stmt|[p1, p2, ...] - evaluate awk statement(s).") },
{ "finish", "", D_finish, D_FINISH, do_finish,
gettext_noop("finish - execute until selected stack frame returns.") },
{ "frame", "f", D_frame, D_FRAME, do_frame,
gettext_noop("frame [N] - select and print stack frame number N.") },
{ "help", "h", D_help, D_HELP, do_help,
gettext_noop("help [command] - print list of commands or explanation of command.") },
{ "ignore", "", D_ignore, D_IGNORE, do_ignore_breakpoint,
gettext_noop("ignore N COUNT - set ignore-count of breakpoint number N to COUNT.") },
{ "info", "i", D_info, D_INFO, do_info,
gettext_noop("info topic - source|sources|variables|functions|break|frame|args|locals|display|watch.") },
{ "list", "l", D_list, D_LIST, do_list,
gettext_noop("list [-|+|[filename:]lineno|function|range] - list specified line(s).") },
{ "next", "n", D_next, D_NEXT, do_next,
gettext_noop("next [COUNT] - step program, proceeding through subroutine calls.") },
{ "nexti", "ni", D_nexti, D_NEXTI, do_nexti,
gettext_noop("nexti [COUNT] - step one instruction, but proceed through subroutine calls.") },
{ "option", "o", D_option, D_OPTION, do_option,
gettext_noop("option [name[=value]] - set or display debugger option(s).") },
{ "print", "p", D_print, D_PRINT, do_print_var,
gettext_noop("print var [var] - print value of a variable or array.") },
{ "printf", "", D_printf, D_PRINTF, do_print_f,
gettext_noop("printf format, [arg], ... - formatted output.") },
{ "quit", "q", D_quit, D_QUIT, do_quit,
gettext_noop("quit - exit debugger.") },
{ "return", "", D_return, D_RETURN, do_return,
gettext_noop("return [value] - make selected stack frame return to its caller.") },
{ "run", "r", D_run, D_RUN, do_run,
gettext_noop("run - start or restart executing program.") },
#ifdef HAVE_LIBREADLINE
{ "save", "", D_save, D_SAVE, do_save,
gettext_noop("save filename - save commands from the session to file.") },
#endif
{ "set", "", D_set, D_SET, do_set_var,
gettext_noop("set var = value - assign value to a scalar variable.") },
{ "silent", "", D_silent, D_SILENT, do_commands,
gettext_noop("silent - suspends usual message when stopped at a breakpoint/watchpoint.") },
{ "source", "", D_source, D_SOURCE, do_source,
gettext_noop("source file - execute commands from file.") },
{ "step", "s", D_step, D_STEP, do_step,
gettext_noop("step [COUNT] - step program until it reaches a different source line.") },
{ "stepi", "si", D_stepi, D_STEPI, do_stepi,
gettext_noop("stepi [COUNT] - step one instruction exactly.") },
{ "tbreak", "t", D_tbreak, D_TBREAK, do_tmp_breakpoint,
gettext_noop("tbreak [[filename:]N|function] - set a temporary breakpoint.") },
{ "trace", "", D_trace, D_TRACE, do_trace_instruction,
gettext_noop("trace on|off - print instruction before executing.") },
{ "undisplay", "", D_undisplay, D_UNDISPLAY, do_undisplay,
gettext_noop("undisplay [N] - remove variable(s) from automatic display list.") },
{ "until", "u", D_until, D_UNTIL, do_until,
gettext_noop("until [[filename:]N|function] - execute until program reaches a different line or line N within current frame.") },
{ "unwatch", "", D_unwatch, D_UNWATCH, do_unwatch,
gettext_noop("unwatch [N] - remove variable(s) from watch list.") },
{ "up", "", D_up, D_UP, do_up,
gettext_noop("up [N] - move N frames up the stack.") },
{ "watch", "w", D_watch, D_WATCH, do_watch,
gettext_noop("watch var - set a watchpoint for a variable.") },
{ NULL, NULL, D_illegal, 0, (Func_cmd) 0,
NULL },
};
struct argtoken argtab[] = {
{ "args", D_info, A_ARGS },
{ "break", D_info, A_BREAK },
{ "del", D_enable, A_DEL },
{ "display", D_info, A_DISPLAY },
{ "frame", D_info, A_FRAME },
{ "functions", D_info, A_FUNCTIONS },
{ "locals", D_info, A_LOCALS },
{ "off", D_trace, A_TRACE_OFF },
{ "on", D_trace, A_TRACE_ON },
{ "once", D_enable, A_ONCE },
{ "source", D_info, A_SOURCE },
{ "sources", D_info, A_SOURCES },
{ "variables", D_info, A_VARIABLES },
{ "watch", D_info, A_WATCH },
{ NULL, D_illegal, 0 },
};
/* get_command --- return command handler function */
Func_cmd
get_command(int ctype)
{
int i;
for (i = 0; cmdtab[i].name != NULL; i++) {
if (cmdtab[i].type == ctype)
return cmdtab[i].cf_ptr;
}
return (Func_cmd) 0;
}
/* get_command_name --- return command name given it's type */
const char *
get_command_name(int ctype)
{
int i;
for (i = 0; cmdtab[i].name != NULL; i++) {
if (cmdtab[i].type == ctype)
return cmdtab[i].name;
}
return NULL;
}
/* mk_cmdarg --- make an argument for command */
static CMDARG *
mk_cmdarg(enum argtype type)
{
CMDARG *arg;
emalloc(arg, CMDARG *, sizeof(CMDARG), "mk_cmdarg");
memset(arg, 0, sizeof(CMDARG));
arg->type = type;
return arg;
}
/* append_cmdarg --- append ARG to the list of arguments for the current command */
static void
append_cmdarg(CMDARG *arg)
{
static CMDARG *savetail;
if (arg_list == NULL)
arg_list = arg;
else
savetail->next = arg;
savetail = arg;
}
/* free_cmdarg --- free all arguments in LIST */
void
free_cmdarg(CMDARG *list)
{
CMDARG *arg, *nexta;
for (arg = list; arg != NULL; arg = nexta) {
nexta = arg->next;
switch (arg->type) {
case D_variable:
case D_subscript:
case D_array:
case D_string:
if (arg->a_string != NULL)
efree(arg->a_string);
break;
case D_node:
case D_field:
unref(arg->a_node);
break;
default:
break;
}
efree(arg);