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debug.c
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debug.c
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/*
* debug.c - gawk debugger
*/
/*
* 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"
#ifndef O_RDONLY
#include <fcntl.h> /* open() */
#endif
extern bool exiting;
extern SRCFILE *srcfiles;
extern INSTRUCTION *rule_list;
extern INSTRUCTION *code_block;
extern NODE **fcall_list;
extern long fcall_count;
extern FILE *output_fp;
extern IOBUF *curfile;
extern const char *command_file;
extern const char *get_spec_varname(Func_ptr fptr);
extern int zzparse(void);
#define read_command() (void) zzparse()
extern const char *redir2str(int redirtype);
static char *linebuf = NULL; /* used to print a single line of source */
static size_t linebuf_len;
FILE *out_fp;
char *dbg_prompt;
char *commands_prompt = "> "; /* breakpoint or watchpoint commands list */
char *eval_prompt = "@> "; /* awk statement(s) */
bool input_from_tty = false;
int input_fd;
static SRCFILE *cur_srcfile;
static long cur_frame = 0;
static INSTRUCTION *cur_pc;
int cur_rule = 0;
static bool prog_running = false;
struct condition {
INSTRUCTION *code;
AWK_CONTEXT *ctxt;
char *expr;
};
struct commands_item {
struct commands_item *next;
struct commands_item *prev;
int cmd;
char *cmd_string;
CMDARG *arg;
};
/* breakpoint structure */
typedef struct break_point {
struct break_point *next;
struct break_point *prev;
int number;
long ignore_count;
long hit_count;
char *src;
INSTRUCTION *bpi; /* Op_breakpoint */
struct commands_item commands; /* list of commands to run */
bool silent;
struct condition cndn;
short flags;
#define BP_ENABLE 1
#define BP_ENABLE_ONCE 2 /* enable once */
#define BP_TEMP 4
#define BP_IGNORE 8
} BREAKPOINT;
static BREAKPOINT breakpoints = { &breakpoints, &breakpoints, 0 };
#ifdef HAVE_LIBREADLINE
/* do_save -- save command */
static int sess_history_base = 0;
#endif
/* 'list' command */
static int last_printed_line = 0;
static int last_print_count; /* # of lines printed */
/* watch or display item */
struct list_item {
struct list_item *next;
struct list_item *prev;
int number; /* item number */
NODE *symbol; /* variable or function param */
NODE **subs; /* subscripts */
int num_subs; /* subscript(dimension) count */
char *sname; /* symbol or param name */
long fcall_count;
struct commands_item commands;
int silent;
struct condition cndn;
/* This is for the value of the watched item */
union {
NODE *n;
long l;
} value[2];
#define cur_value value[0].n
#define cur_size value[0].l
#define old_value value[1].n
#define old_size value[1].l
int flags;
#define PARAM 1
#define SUBSCRIPT 2
#define FIELD_NUM 4
#define OLD_IS_ARRAY 8 /* old item is array */
#define CUR_IS_ARRAY 16 /* current item is array */
};
#define IS_PARAM(d) (((d)->flags & PARAM) != 0)
#define IS_SUBSCRIPT(d) (((d)->flags & SUBSCRIPT) != 0)
#define IS_FIELD(d) (((d)->flags & FIELD_NUM) != 0)
#define WATCHING_ARRAY(d) (((d)->flags & CUR_IS_ARRAY) != 0)
static struct list_item display_list = { &display_list, &display_list, 0 };
static struct list_item watch_list = { &watch_list, &watch_list, 0 };
/* Structure to maintain data for processing debugger commands */
static struct {
long fcall_count; /* 'finish', 'until', 'next', 'step', 'nexti' commands */
int sourceline; /* source line number last
* time we stopped execution,
* used by next, until and step commands
*/
char *source; /* next, until and step */
INSTRUCTION *pc; /* 'until' and 'return' commands */
int repeat_count; /* 'step', 'next', 'stepi', 'nexti' commands */
bool print_frame; /* print frame info, 'finish' and 'until' */
bool print_ret; /* print returned value, 'finish' */
int break_point; /* non-zero (breakpoint number) if stopped at break point */
int watch_point; /* non-zero (watchpoint number) if stopped at watch point */
int (*check_func)(INSTRUCTION **); /* function to decide when to suspend
* awk interpreter and return control
* to debugger command interpreter.
*/
enum argtype command; /* command type */
} stop;
/* restart related stuff */
extern char **d_argv; /* copy of argv array */
static bool need_restart = false;
enum { BREAK=1, WATCH, DISPLAY, HISTORY, OPTION };
static const char *const env_variable[] = {
"",
"DGAWK_BREAK",
"DGAWK_WATCH",
"DGAWK_DISPLAY",
"DGAWK_HISTORY",
"DGAWK_OPTION",
};
static void serialize(int );
static void unserialize(int );
static const char *commands_string = NULL;
static int commands_string_len = 0;
static char line_sep;
#define FSEP (char)'\037'
#define RSEP (char)'\036'
#define CSEP (char)'\035'
/* debugger option */
struct dbg_option {
const char *name;
int *num_val;
char **str_val;
void (*assign)(const char *);
const char *help_txt;
};
#define DEFAULT_HISTFILE "./.gawk_history"
#define DEFAULT_OPTFILE "./.gawkrc"
#define DEFAULT_PROMPT "gawk> "
#define DEFAULT_LISTSIZE 15
#define DEFAULT_HISTSIZE 100
static void set_gawk_output(const char *file);
static void set_prompt(const char *value);
static void set_listsize(const char *value);
static void set_trace(const char *value);
static void set_save_history(const char *value);
static void set_save_options(const char *value);
static void set_history_size(const char *value);
static const char *options_file = DEFAULT_OPTFILE;
#ifdef HAVE_LIBREADLINE
static const char *history_file = DEFAULT_HISTFILE;
#endif
/* debugger option related variables */
static char *output_file = "/dev/stdout"; /* gawk output redirection */
char *dgawk_prompt = NULL; /* initialized in interpret */
static int list_size = DEFAULT_LISTSIZE; /* # of lines that 'list' prints */
static int do_trace = false;
static int do_save_history = true;
static int do_save_options = true;
static int history_size = DEFAULT_HISTSIZE; /* max # of lines in history file */
static const struct dbg_option option_list[] = {
{"history_size", &history_size, NULL, &set_history_size,
gettext_noop("set or show the number of lines to keep in history file.") },
{"listsize", &list_size, NULL, &set_listsize,
gettext_noop("set or show the list command window size.") },
{"outfile", NULL, &output_file, &set_gawk_output,
gettext_noop("set or show gawk output file.") },
{"prompt", NULL, &dgawk_prompt, &set_prompt,
gettext_noop("set or show debugger prompt."), },
{"save_history", &do_save_history, NULL, &set_save_history,
gettext_noop("(un)set or show saving of command history (value=on|off).") },
{"save_options", &do_save_options, NULL, &set_save_options,
gettext_noop("(un)set or show saving of options (value=on|off).") },
{"trace", &do_trace, NULL, &set_trace,
gettext_noop("(un)set or show instruction tracing (value=on|off).") },
{0, NULL, NULL, NULL, 0},
};
static void save_options(const char *file);
/* pager */
jmp_buf pager_quit_tag;
bool pager_quit_tag_valid = false;
static int screen_width = INT_MAX; /* no of columns */
static int screen_height = INT_MAX; /* no of rows */
static int pager_lines_printed = 0; /* no of lines printed so far */
static void restart(bool run) ATTRIBUTE_NORETURN;
static void close_all(void);
static int open_readfd(const char *file);
static int find_lines(SRCFILE *s);
static SRCFILE *source_find(char *src);
static int print_lines(char *src, int start_line, int nlines);
static void print_symbol(NODE *r, bool isparam);
static NODE *find_frame(long num);
static NODE *find_param(const char *name, long num, char **pname);
static NODE *find_symbol(const char *name, char **pname);
static NODE *find_array(const char *name);
static void print_field(long field_num);
static int print_function(INSTRUCTION *pc, void *);
static void print_frame(NODE *func, char *src, int srcline);
static void print_numbered_frame(long num);
static void print_cur_frame_and_sourceline(void);
static INSTRUCTION *find_rule(char *src, long lineno);
static INSTRUCTION *mk_breakpoint(char *src, int srcline);
static int execute_commands(struct commands_item *commands);
static void delete_commands_item(struct commands_item *c);
static NODE *execute_code(volatile INSTRUCTION *code);
static int pre_execute_code(INSTRUCTION **pi);
static int parse_condition(int type, int num, char *expr);
static BREAKPOINT *add_breakpoint(INSTRUCTION *prevp, INSTRUCTION *ip, char *src, bool silent);
static BREAKPOINT *set_breakpoint_next(INSTRUCTION *rp, INSTRUCTION *ip);
static BREAKPOINT *set_breakpoint_at(INSTRUCTION *rp, int lineno, bool silent);
static void delete_breakpoint(BREAKPOINT *b);
static BREAKPOINT *find_breakpoint(long num);
static void display(struct list_item *d);
static struct list_item *find_item(struct list_item *list, long num);
static struct list_item *add_item(struct list_item *list, int type, NODE *symbol, char *pname);
static void delete_item(struct list_item *d);
static int breakpoint_triggered(BREAKPOINT *b);
static int watchpoint_triggered(struct list_item *w);
static void print_instruction(INSTRUCTION *pc, Func_print print_func, FILE *fp, int in_dump);
static int print_code(INSTRUCTION *pc, void *x);
static void next_command();
static void debug_post_execute(INSTRUCTION *pc);
static int debug_pre_execute(INSTRUCTION **pi);
static char *g_readline(const char *prompt);
static int prompt_yes_no(const char *, char , int , FILE *);
static struct pf_data {
Func_print print_func;
bool defn;
FILE *fp;
} pf_data;
char * (*read_a_line)(const char *) = 0; /* reads a line of input */
struct command_source
{
int fd;
int is_tty;
char * (*read_func)(const char *);
int (*close_func)(int);
int eof_status; /* see push_cmd_src */
int cmd; /* D_source or 0 */
char *str; /* sourced file */
struct command_source *next;
};
static struct command_source *cmd_src = NULL;
#define CHECK_PROG_RUNNING() \
do { \
if (! prog_running) { \
d_error(_("program not running.")); \
return false; \
} \
} while (false)
/* g_readline -- read a line of text; the interface is like 'readline' but
* without any command-line editing; used when not compiled with
* readline support and/or input is not from terminal (prompt set to NULL).
*/
static char *
g_readline(const char *prompt)
{
char *line;
size_t line_size = 100;
static char buf[2];
char *p, *end;
int n;
if (input_from_tty && prompt && *prompt)
fprintf(out_fp, "%s", prompt);
emalloc(line, char *, line_size + 1, "g_readline");
p = line;
end = line + line_size;
while ((n = read(input_fd, buf, 1)) > 0) {
if (buf[0] == '\n') {
if (p > line && p[-1] == '\r')
p--;
break;
}
if (p == end) {
erealloc(line, char *, 2 * line_size + 1, "g_readline");
p = line + line_size;
line_size *= 2;
end = line + line_size;
}
*p++ = buf[0];
}
if (n == -1 || (n == 0 && p == line)) {
efree(line);
return NULL;
}
*p = '\0';
return line;
}
/* d_error --- print an error message */
void
d_error(const char *mesg, ...)
{
va_list args;
va_start(args, mesg);
fprintf(out_fp, _("error: "));
vfprintf(out_fp, mesg, args);
fprintf(out_fp, "\n");
va_end(args);
}
/* find_lines --- find the positions of the lines in the source file. */
static int
find_lines(SRCFILE *s)
{
char *buf, *p, *end;
int n;
int ofs = 0;
int *pos;
int pos_size;
int maxlen = 0;
int numlines = 0;
char lastchar = '\0';
emalloc(buf, char *, s->bufsize, "find_lines");
pos_size = s->srclines;
emalloc(s->line_offset, int *, (pos_size + 2) * sizeof(int), "find_lines");
pos = s->line_offset;
pos[0] = 0;
while ((n = read(s->fd, buf, s->bufsize)) > 0) {
end = buf + n;
lastchar = buf[n - 1];
p = buf;
while (p < end) {
if (*p++ == '\n') {
if (++numlines > pos_size) {
erealloc(s->line_offset, int *, (2 * pos_size + 2) * sizeof(int), "find_lines");
pos = s->line_offset + pos_size;
pos_size *= 2;
}
*++pos = ofs + (p - buf);
if ((pos[0] - pos[-1]) > maxlen)
maxlen = pos[0] - pos[-1]; /* length including NEWLINE */
}
}
ofs += n;
}
efree(buf);
if (n == -1) {
d_error(_("can't read source file `%s' (%s)"),
s->src, strerror(errno));
return -1;
}
if (ofs <= 0) {
fprintf(out_fp, _("source file `%s' is empty.\n"), s->src);
return -1;
}
if (lastchar != '\n') {
/* fake a NEWLINE at end */
*++pos = ofs + 1;
numlines++;
if ((pos[0] - pos[-1]) > maxlen)
maxlen = pos[0] - pos[-1];
}
s->maxlen = maxlen;
s->srclines = numlines;
return 0;
}
/* source_find --- return the SRCFILE struct for the source 'src' */
static SRCFILE *
source_find(char *src)
{
SRCFILE *s;
struct stat sbuf;
char *path;
int errno_val = 0;
if (src == NULL || *src == '\0') {
d_error(_("no current source file."));
return NULL;
}
if (cur_srcfile->src == src) /* strcmp(cur_srcfile->src, src) == 0 */
return cur_srcfile;
for (s = srcfiles->next; s != srcfiles; s = s->next) {
if ((s->stype == SRC_FILE || s->stype == SRC_INC)
&& strcmp(s->src, src) == 0)
return s;
}
path = find_source(src, & sbuf, & errno_val, false);
if (path != NULL) {
for (s = srcfiles->next; s != srcfiles; s = s->next) {
if ((s->stype == SRC_FILE || s->stype == SRC_INC)
&& files_are_same(path, s)) {
efree(path);
return s;
}
}
efree(path);
}
d_error(_("cannot find source file named `%s' (%s)"), src, strerror(errno_val));
return NULL;
}
/* print_lines --- print source lines, and update 'cur_srcfile' */
static int
print_lines(char *src, int start_line, int nlines)
{
SRCFILE *s;
int *pos;
int i;
struct stat sbuf;
s = source_find(src);
if (s == NULL)
return -1;
if (s->fd <= INVALID_HANDLE && (s->fd = srcopen(s)) <= INVALID_HANDLE) {
d_error(_("can't open source file `%s' for reading (%s)"),
src, strerror(errno));
return -1;
}
if (fstat(s->fd, &sbuf) == 0 && s->mtime < sbuf.st_mtime) {
fprintf(out_fp, _("WARNING: source file `%s' modified since program compilation.\n"),
src);
efree(s->line_offset);
s->line_offset = NULL;
s->mtime = sbuf.st_mtime;
/* reopen source file */
close(s->fd);
s->fd = INVALID_HANDLE;
if ((s->fd = srcopen(s)) <= INVALID_HANDLE) {
d_error(_("can't open source file `%s' for reading (%s)"),
src, strerror(errno));
return -1;
}
}
if (s->line_offset == NULL && find_lines(s) != 0)
return -1;
if (start_line < 1 || start_line > s->srclines) {
d_error(_("line number %d out of range; `%s' has %d lines"),
start_line, src, s->srclines);
return -1;
}
assert(nlines > 0);
if ((start_line + nlines - 1) > s->srclines)
nlines = s->srclines - start_line + 1;
pos = s->line_offset;
if (lseek(s->fd, (off_t) pos[start_line - 1], SEEK_SET) < 0) {
d_error("%s: %s", src, strerror(errno));
return -1;
}
if (linebuf == NULL) {
emalloc(linebuf, char *, s->maxlen + 20, "print_lines"); /* 19 for line # */
linebuf_len = s->maxlen;
} else if (linebuf_len < s->maxlen) {
erealloc(linebuf, char *, s->maxlen + 20, "print_lines");
linebuf_len = s->maxlen;
}
for (i = start_line; i < start_line + nlines; i++) {
int supposed_len, len;
char *p;
sprintf(linebuf, "%-8d", i);
/* mark the line about to be executed with =>; nlines > 1
* condition makes sure that we are in list command
*/
if (nlines > 1) {
BREAKPOINT *b;
bool has_bpt = false;
for (b = breakpoints.prev; b != &breakpoints; b = b->prev) {
if (src == b->src && i == b->bpi->source_line) {
has_bpt = true;
break;
}
}
if (prog_running && src == source && i == sourceline) {
if (has_bpt)
sprintf(linebuf, "%-4d:b=>", i);
else
sprintf(linebuf, "%-4d =>", i);
} else if (has_bpt)
sprintf(linebuf, "%-4d:b ", i);
}
p = linebuf + strlen(linebuf);
supposed_len = pos[i] - pos[i - 1];
len = read(s->fd, p, supposed_len);
switch (len) {
case -1:
d_error(_("can't read source file `%s' (%s)"),
src, strerror(errno));
return -1;
case 0:
d_error(_("unexpected eof while reading file `%s', line %d"),
src, i);
return -1;
default:
if (i == s->srclines && p[len - 1] != '\n')
p[len++] = '\n';
#if 0
if (len != supposed_len || p[len - 1] != '\n') {
d_error(_("source file `%s' modified since start of program execution"),
src);
return -1;
}
#endif
len += (p - linebuf);
if (fwrite(linebuf, sizeof(char), len, out_fp) != len)
return -1;
}
}
if (cur_srcfile != s) {
if (cur_srcfile->fd != INVALID_HANDLE) {
close(cur_srcfile->fd);
cur_srcfile->fd = INVALID_HANDLE;
}
cur_srcfile = s;
}
return (i - 1); /* no of lines printed */
}
/* do_list --- list command */
int
do_list(CMDARG *arg, int cmd ATTRIBUTE_UNUSED)
{
long line_first, line_last;
long count = list_size;
INSTRUCTION *rp;
char *src = cur_srcfile->src;
line_first = last_printed_line + 1; /* default or no arg */
if (arg == NULL) /* list or list + */
goto list;
switch (arg->type) {
case D_int: /* list n or list - */
if (arg->a_int < 0) { /* list - */
line_first = last_printed_line - last_print_count - list_size + 1;
if (line_first < 1) {
if (last_printed_line != last_print_count)
line_first = 1;
else
return false;
}
} else {
line:
line_first = arg->a_int - list_size / 2;
if (line_first < 1)
line_first = 1;
}
break;
case D_range: /* list m-n */
range:
line_first = arg->a_int;
arg = arg->next;
assert(arg != NULL);
assert(arg->type == D_int);
count = arg->a_int - line_first + 1;
break;
case D_string:
src = arg->a_string;
if (arg->next != NULL) {
arg = arg->next;
if (arg->type == D_int) /* list file:n */
goto line;
else if (arg->type == D_range) /* list file:m-n */
goto range;
else if (arg->type == D_func) /* list file:function */
goto func;
else
line_first = 1;
} else
line_first = 1;
break;
case D_func: /* list function */
func:
rp = arg->a_node->code_ptr;
src = rp->source_file;
line_first = rp->source_line - list_size / 2;
if (line_first < 1)
line_first = 1;
break;
default:
break;
}
list:
line_last = print_lines(src, line_first, count);
if (line_last != -1) {
last_printed_line = line_last;
last_print_count = line_last - line_first + 1;
}
return false;
}
/* do_info --- info command */
int
do_info(CMDARG *arg, int cmd ATTRIBUTE_UNUSED)
{
NODE **table;
if (arg == NULL || arg->type != D_argument)
return false;
switch (arg->a_argument) {
case A_SOURCE:
fprintf(out_fp, _("Current source file: %s\n"), cur_srcfile->src);
fprintf(out_fp, _("Number of lines: %d\n"), cur_srcfile->srclines);
break;
case A_SOURCES:
{
SRCFILE *s;
for (s = srcfiles->next; s != srcfiles; s = s->next) {
fprintf(out_fp, _("Source file (lines): %s (%d)\n"),
(s->stype == SRC_FILE || s->stype == SRC_INC) ? s->src
: "cmd. line",
s->srclines);
}
}
break;
case A_BREAK:
initialize_pager(out_fp);
if (setjmp(pager_quit_tag) == 0) {
BREAKPOINT *b;
struct commands_item *c;
gprintf(out_fp, _("Number Disp Enabled Location\n\n"));
for (b = breakpoints.prev; b != &breakpoints; b = b->prev) {
char *disp = "keep";
if (b->flags & BP_ENABLE_ONCE)
disp = "dis";
else if(b->flags & BP_TEMP)
disp = "del";
gprintf(out_fp, "%-6d %-4.4s %-7.7s file %s, line #%d\n",
b->number, disp, (b->flags & BP_ENABLE) ? "yes" : "no",
b->src, b->bpi->source_line);
if (b->hit_count > 0)
gprintf(out_fp, _("\tno of hits = %ld\n"), b->hit_count);
if (b->flags & BP_IGNORE)
gprintf(out_fp, _("\tignore next %ld hit(s)\n"), b->ignore_count);
if (b->cndn.code != NULL)
gprintf(out_fp, _("\tstop condition: %s\n"), b->cndn.expr);
if (b->commands.next != &b->commands)
gprintf(out_fp, _("\tcommands:\n"));
for (c = b->commands.next; c != &b->commands; c = c->next) {
gprintf(out_fp, "\t%s\n", c->cmd_string);
if (c->cmd == D_eval) {
char *start, *end;
CMDARG *a = c->arg;
start = strchr(a->a_string, '{');
end = strrchr(a->a_string, '}');
if (start == NULL || end == NULL)
continue;
start++;
*end = '\0';
gprintf(out_fp, "%s", start); /* FIXME: translate ? */
*end = '}';
}
}
}
}
break;
case A_FRAME:
CHECK_PROG_RUNNING();
fprintf(out_fp, _("Current frame: "));
print_numbered_frame(cur_frame);
if (cur_frame < fcall_count) {
fprintf(out_fp, _("Called by frame: "));
print_numbered_frame(cur_frame + 1);
}
if (cur_frame > 0) {
fprintf(out_fp, _("Caller of frame: "));
print_numbered_frame(cur_frame - 1);
}
break;
case A_ARGS:
case A_LOCALS:
{
NODE *f, *func;
INSTRUCTION *pc;
int arg_count, pcount;
int i, from, to;
CHECK_PROG_RUNNING();
f = find_frame(cur_frame);
func = f->func_node;
if (func == NULL) {
/* print ARGV ? */
fprintf(out_fp, _("None in main().\n"));
return false;
}
pcount = func->param_cnt; /* # of defined params */
pc = (INSTRUCTION *) f->reti; /* Op_func_call instruction */
arg_count = (pc + 1)->expr_count; /* # of arguments supplied */
if (arg_count > pcount) /* extra args */
arg_count = pcount;
if (arg->a_argument == A_ARGS) {
from = 0;
to = arg_count - 1;
} else {
from = arg_count;
to = pcount - 1;
}
for (i = from; i <= to; i++) {
NODE *r;
r = f->stack[i];
if (r->type == Node_array_ref)
r = r->orig_array;
fprintf(out_fp, "%s = ", func->fparms[i].param);
print_symbol(r, true);
}
if (to < from)
fprintf(out_fp, "%s",
arg->a_argument == A_ARGS ?
_("No arguments.\n") :
_("No locals.\n"));
}
break;
case A_VARIABLES:
table = variable_list();
initialize_pager(out_fp);
if (setjmp(pager_quit_tag) == 0) {
gprintf(out_fp, _("All defined variables:\n\n"));
print_vars(table, gprintf, out_fp);
}
efree(table);
break;
case A_FUNCTIONS:
table = function_list(true);
initialize_pager(out_fp);
if (setjmp(pager_quit_tag) == 0) {
gprintf(out_fp, _("All defined functions:\n\n"));
pf_data.print_func = gprintf;
pf_data.fp = out_fp;
pf_data.defn = true;
(void) foreach_func(table,
(int (*)(INSTRUCTION *, void *)) print_function,
&pf_data);
}
efree(table);
break;
case A_DISPLAY:
case A_WATCH:
initialize_pager(out_fp);
if (setjmp(pager_quit_tag) == 0) {
struct list_item *d, *list;
if (arg->a_argument == A_DISPLAY) {
list = &display_list;
gprintf(out_fp, _("Auto-display variables:\n\n"));
} else {
list = &watch_list;
gprintf(out_fp, _("Watch variables:\n\n"));
}
for (d = list->prev; d != list; d = d->prev) {
int i;
struct commands_item *c;
NODE *symbol = d->symbol;
if (IS_SUBSCRIPT(d)) {
gprintf(out_fp, "%d:\t%s", d->number, d->sname);
for (i = 0; i < d->num_subs; i++) {
NODE *sub;
sub = d->subs[i];
gprintf(out_fp, "[\"%s\"]", sub->stptr);
}
gprintf(out_fp, "\n");
} else if (IS_FIELD(d))
gprintf(out_fp, "%d:\t$%ld\n", d->number, get_number_si(symbol));
else
gprintf(out_fp, "%d:\t%s\n", d->number, d->sname);
if (d->cndn.code != NULL)
gprintf(out_fp, _("\tstop condition: %s\n"), d->cndn.expr);
if (d->commands.next != &d->commands)
gprintf(out_fp, _("\tcommands:\n"));
for (c = d->commands.next; c != &d->commands; c = c->next) {
gprintf(out_fp, "\t%s\n", c->cmd_string);
if (c->cmd == D_eval) {
char *start, *end;
CMDARG *a = c->arg;
start = strchr(a->a_string, '{');
end = strrchr(a->a_string, '}');
if (start == NULL || end == NULL)
continue;
start++;
*end = '\0';
gprintf(out_fp, "%s", start); /* FIXME: translate ? */
*end = '}';
}
}
}
}
break;
default:
break;
}
return false;
}
/* print_symbol --- print a symbol table entry */
static void
print_symbol(NODE *r, bool isparam)
{
switch (r->type) {
case Node_var_new:
fprintf(out_fp, "untyped variable\n");
break;
case Node_var:
if (! isparam && r->var_update)
r->var_update();
valinfo(r->var_value, fprintf, out_fp);
break;
case Node_var_array:
fprintf(out_fp, "array, %ld elements\n", r->table_size);
break;
case Node_func:
fprintf(out_fp, "`function'\n");
break;
default:
break;
}
}
/* find_frame --- find frame given a frame number */
static NODE *
find_frame(long num)
{
assert(num >= 0);
if (num == 0)
return frame_ptr;
assert(prog_running == true);
assert(num <= fcall_count);
assert(fcall_list[num] != NULL);
return fcall_list[num];
}
/* find_param --- find a function parameter in a given frame number */
static NODE *
find_param(const char *name, long num, char **pname)
{
NODE *r = NULL;
NODE *f;
char *fparam;
if (pname)
*pname = NULL;
if (num < 0 || num > fcall_count || name == NULL)
return NULL;
f = find_frame(num);
if (f->func_node != NULL) { /* in function */
NODE *func;
int i, pcount;
func = f->func_node;
pcount = func->param_cnt;
for (i = 0; i < pcount; i++) {
fparam = func->fparms[i].param;
if (strcmp(name, fparam) == 0) {
r = f->stack[i];
if (r->type == Node_array_ref)
r = r->orig_array;
if (pname)
*pname = fparam;
break;
}