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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <setjmp.h>
#include <stdarg.h>
#include <wchar.h>
#include "config.h"
#include "lib.h"
#include "debug.h"
#include "gc.h"
#include "unwind.h"
#include "stream.h"
#include "parser.h"
int opt_debugger;
int debug_depth;
val debug_block_s;
static int step_mode;
static int next_depth = -1;
static val breakpoints;
static val last_command;
static int cols = 80;
static void help(val stream)
{
put_string(lit("commands:\n"
"? - help s - step into form\n"
"h - help n - step over form\n"
"c - continue f - finish form\n"
"v - show variable binding environment s - show current form\n"
"b - set breakpoint by line number i - show current data\n"
"d - delete breakpoint w - backtrace\n"
"l - list breakpoints\n"),
stream);
}
static void show_bindings(val env, val stream)
{
val level = zero;
put_string(lit("bindings:\n"), stream);
for (;; level = plus(level, one)) {
if (nullp(env))
break;
else if (consp(env)) {
format(stream, lit("~s: ~s\n"), level, env, nao);
break;
} else if (type(env) == ENV) {
format(stream, lit("~s: ~s\n"), level, env->e.vbindings, nao);
env = env->e.up_env;
} else {
format(stream, lit("invalid environment object: ~s\n"), env, nao);
break;
}
}
}
val debug(val form, val bindings, val data, val line, val pos, val base)
{
uses_or2;
val lineno = source_loc(form);
if (!step_mode && !memqual(lineno, breakpoints)
&& (debug_depth > next_depth))
{
return nil;
} else {
val print_form = t;
val print_data = t;
for (;;) {
val input, command;
if (print_form) {
format(std_output, lit("stopped at line ~a\n"), lineno, nao);
format(std_output, lit("form: ~s\n"), form, nao);
format(std_output, lit("depth: ~s\n"), num(debug_depth), nao);
print_form = nil;
}
if (print_data) {
if (data && pos) {
val half = num((cols - 8) / 2);
val full = num((cols - 8));
val prefix, suffix;
if (lt(pos, half)) {
prefix = sub_str(data, zero, pos);
suffix = sub_str(data, pos, full);
} else {
prefix = sub_str(data, minus(pos, half), pos);
suffix = sub_str(data, pos, plus(pos, half));
}
format(std_output, lit("data (~s:~s):\n~s . ~s\n"),
line, plus(pos, base), prefix, suffix, nao);
} else {
format(std_output, lit("data (~s):\n~s\n"), line, data, nao);
}
print_data = nil;
}
format(std_output, lit("txr> "), nao);
flush_stream(std_output);
input = split_str_set(or2(get_line(std_input), lit("q")), lit("\t "));
command = if3(equal(first(input), null_string),
or2(last_command, lit("")), first(input));
last_command = command;
if (equal(command, lit("?")) || equal(command, lit("h"))) {
help(std_output);
continue;
} else if (equal(command, null_string)) {
continue;
} else if (equal(command, lit("c"))) {
step_mode = 0;
next_depth = -1;
return nil;
} else if (equal(command, lit("s"))) {
step_mode = 1;
return nil;
} else if (equal(command, lit("n"))) {
step_mode = 0;
next_depth = debug_depth;
return nil;
} else if (equal(command, lit("f"))) {
step_mode = 0;
next_depth = debug_depth - 1;
return nil;
} else if (equal(command, lit("v"))) {
show_bindings(bindings, std_output);
} else if (equal(command, lit("s"))) {
print_form = t;
} else if (equal(command, lit("i"))) {
print_data = t;
} else if (equal(command, lit("b")) || equal(command, lit("d"))) {
if (!rest(input)) {
format(std_output, lit("b needs argument\n"), nao);
continue;
} else {
long n = wcstol(c_str(second(input)), NULL, 10);
if (equal(command, lit("b")))
push(num(n), &breakpoints);
}
} else if (equal(command, lit("l"))) {
format(std_output, lit("breakpoints: ~s\n"), breakpoints, nao);
} else if (equal(command, lit("w"))) {
format(std_output, lit("backtrace:\n"), nao);
{
uw_frame_t *iter;
for (iter = uw_current_frame(); iter != 0; iter = iter->uw.up) {
if (iter->uw.type == UW_DBG) {
if (iter->db.ub_p_a_pairs)
format(std_output, lit("(~s ~s ~s)\n"), iter->db.func,
iter->db.args, iter->db.ub_p_a_pairs, nao);
else
format(std_output, lit("(~s ~s)\n"), iter->db.func,
iter->db.args, nao);
}
}
}
} else if (equal(command, lit("q"))) {
uw_throwf(query_error_s, lit("terminated via debugger"), nao);
} else {
format(std_output, lit("unrecognized command: ~a\n"), command, nao);
}
}
return nil;
}
}
void debug_init(void)
{
step_mode = 1;
protect(&breakpoints, &last_command, (val *) 0);
debug_block_s = intern(lit("debug-block"), system_package);
{
char *columns = getenv("COLUMNS");
if (columns)
cols = atoi(columns);
if (cols < 40)
cols = 40;
}
}
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