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main.c
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/* N-Prolog
written by kenichi sasagawa 2016/8~
*/
#include <string.h>
#include <math.h>
#include <signal.h>
#ifndef __APPLE__
#include <stdio_ext.h>
#endif
#include <stdlib.h>
#include <getopt.h>
#include <float.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <pthread.h>
#include <unistd.h>
#include "npl.h"
//global vers
int proof[THREADSIZE];
int nest = 0;
cell heap[CELLSIZE];
int cell_hash_table[HASHTBSIZE];
int variant[VARIANTSIZE][THREADSIZE];
int bigcell[BIGSIZE];
int stack[STACKSIZE][THREADSIZE];
int record_hash_table[HASHTBSIZE][RECORDMAX]; // for hash record database
int record_pt = 1; // current index of record database
int counter[31]; // counter str_set,str_dec ...
int catch_data[CTRLSTK][2][THREADSIZE]; //catch tag,sp,wp
char bridge[BUFSIZE]; // for string_term/2 and parallel buffer
char transfer[BUFSIZE]; // buffer for dp_transfer
token stok = { GO, OTHER };
jmp_buf catch_buf[CTRLSTK][THREADSIZE]; // catch jump buffer
jmp_buf buf; // for REPL halt and error handling.
jmp_buf buf1; // for n_error/2 error check.
jmp_buf buf2; // for break/0 end_of_file/0 exit break
__thread jmp_buf buf3; // for multi-threaded error handling.
int variables[THREADSIZE];
int variables_save[THREADSIZE];
int end_of_file_answer = NIL;
int end_of_file_rest = NIL;
int predicates = NIL;
int builtins = NIL;
int spy_list = NIL;
int reconsult_list = NIL;
int execute_list = NIL;
int op_list = NIL;
int key_list = NIL;
int error_code = 0;
int bag_list;
int nonfree_list;
int unread = NIL; //for parse
int paren_nest = 0; //for parse check ((()))
int left_margin = 4; //for read_line
int break_nest = 0; //for debugger b command
int leap_point = NIL; //for debugger l command
int port; //for debugger
int line; //for error, display line of error point
int column; //for error, display column of error point
int cursor_color; //for ansi_sgr
int cursor_style; //for ansi_sgr
int cursor_row_store = -1; //for ansi_sgr -1=undefined,0~=defined
int cursor_col_store = -1; //for ansi_sgr
int cursor_color_store = -1; //for ansi_sgr
int cursor_style_store = -1; //for ansi_sgr
double timer; // for timer_microseconds/1
//------pointer----
int hp; //heap pointer
int sp[THREADSIZE]; //stack pointer
int fc; //free counter
int ac[THREADSIZE]; //alpha conversion variable count
int wp[THREADSIZE]; //working pointer
int gc; //invoked GC count
int wp_min[THREADSIZE]; // start wp point in each thread
int wp_max[THREADSIZE]; // end wp point in each thread
int cp[THREADSIZE]; // catch pointer
// bignum pointer
int big_pt0 = 0; // pointer of temporaly bignum
int big_pt1 = BIGNUM_PARMA; // pointer of parmanent bignum
//flag
int repl_flag = 1; //for editable REPL read_line 1=on, 0=off
int trace_flag = FULL; //for debugger
int open_flag = 0; //for error 0=not int reading file, 1=in reading file
int gbc_flag = 0; // 0=not display massage 1=display message
int simp_flag = 1; //for bignum 1=if bignum become more simple, simplify, 0=not
int assert_flag = 0; // 0=asserta, 1=assertz
int debug_flag = OFF; // 0=normal mode, 1=debug mode
int fskip_flag = OFF; // for debugger f command
int qskip_flag = OFF; // for debugger q command
int sskip_flag = OFF; // for debugger s command
int xskip_flag = OFF; // for debugger x command
int semiskip_flag = OFF; //for debugger ; command
int sexp_flag = 0; // for debug 0=normal, 1=print data as S expression like LISP
int arguments_flag = 1; //1= 1,2,3 -> (1,2,3) 0= 1,2,3 -> 1,2,3
int quoted_flag = 1; // 0=not print ' 1=print '
int ignore_flag = 0; // 0=infix notation 2+2 1=prefix notation +(2,2)
int link_flag = 0; // 0=not-link, 1=linked
int listing_flag = 0; //for print clause, 0=normal, 1=format print
int colon_sets_calling_context_flag = 1; //1=true, 0=false
int prefix_flag = 0; //for parser 0=not prefix, 1=prefix
int syntax_flag = YES; //syntaxerrors/2 YES=normal. NO=ignore syntax-errors
int fileerr_flag = YES; //fileerrors/2 YES=normal. NO=ignore file-errors
int exist_flag = YES; //existerrors/2 YES=normal, NO=ignore existance_errors
int bridge_flag = 0; //for string_term/2 0=normal, 1=readparse from bridge
int ctrl_c_flag = 0; //for ctrl_c to stop prove
int init_flag = 1; //for halt
int script_flag = 0; // script mode, 0=not scriplt-mode, 1=script-mode.
int check_flag = 0; // for n_error/2 error check
int break_flag = 0; // for break/0 0=normal,1=break.
int parallel_exit_flag = 0; /* To exit parallel threads */
int process_flag = 0; /* when invoke as child process, flag is 1 */
int thread_flag = 0; /* when invoke as multi thread, flag is 1 */
int child_flag = 0; /* when invoke as network child, flag is 1 */
int connect_flag = 0; /* when child listen, connect_flag is 1 */
int receiver_exit_flag = 0; /* TO exit child TCP/IP receiver */
int child_busy_flag = 0; /* while executing in child, child_busy_flag is 1 */
int parent_flag = 0; /* while comunicating child, parent_flag = 1 */
int pause_flag = 0; /* while pause in child, pause_flag = 1 */
int shutdown_flag = 0; /* when receive dp_close, shutdown_flag = 1 */
int active_thread = 0; /* for mt_and/1 mt_or/1 */
//stream
int standard_input;
int standard_output;
int standard_error;
int input_stream;
int output_stream;
int error_stream;
/* -----distributed parallel & TCPIP------*/
int parent_sockfd[2];
int child_sockfd[PARASIZE];
socklen_t parent_len;
struct sockaddr_in parent_addr, child_addr[PARASIZE];
int child_num;
pthread_t receiver_thread;
int child_result[PARASIZE];
/* multi thread */
pthread_mutex_t mutex;
pthread_mutex_t mutex1;
int mt_queue[PARASIZE];
int mt_queue_pt;
int mt_queue_num;
int thread_num = 0;
int para_input[PARASIZE];
int para_output[PARASIZE];
pthread_t mt_para_thread[PARASIZE];
pthread_cond_t mt_cond_para[PARASIZE];
pthread_cond_t mt_cond_main;
pthread_cond_t mt_cond_queue;
pthread_attr_t mt_para_attr[PARASIZE];
size_t mt_para_size[PARASIZE];
/* module */
int module_name; // module name
int export_data[10][2]; // export name,arity
int module_flag; // inner module 1, else 0
int export_pt; // export data pointer
//-----editor-----
char buffer[BUFSIZE][10];
int ed_tab = 4;
int ed_indent = 0;
int ed_lparen_row;
int ed_lparen_col;
int ed_rparen_row;
int ed_rparen_col;
int ed_lbracket_row;
int ed_lbracket_col;
int ed_rbracket_row;
int ed_rbracket_col;
char ed_candidate[30][30];
int ed_candidate_pt;
int ed_operator_color = 5; //default magenta
int ed_builtin_color = 6; //default cyan
int ed_extended_color = 1; //default red
int ed_quote_color = 3; //default yellow
int ed_comment_color = 4; //default blue
int ed_function_color = 2; //default green
int ed_incomment = -1; /*... */
int ed_hight;
int ed_width;
result rtok; // token type and length for editable REPL
void usage()
{
printf("List of options:\n");
printf("-c filename -- NPL starts after reading the file.\n");
printf("-h -- display help.\n");
printf("-n -- NPL run with network mode.\n");
printf("-r -- NPL does not use editable REPL.\n");
printf("-s filename -- NPL run file with script mode.\n");
printf("-v -- dislplay version number.\n");
}
int main(int argc, char *argv[])
{
int ch, input;
char *home, str[STRSIZE];
struct winsize w;
FILE *fp;
signal(SIGINT, reset);
initcell();
initbuiltin();
initoperator();
initstream();
ioctl(0, TIOCGWINSZ, &w);
ed_hight = w.ws_row;
ed_width = w.ws_col;
input_stream = standard_input;
output_stream = standard_output;
error_stream = standard_error;
wp[0] = HEAPSIZE + 1;
wp_min[0] = HEAPSIZE + 1;
wp_max[0] = CELLSIZE;
init_repl();
int ret = setjmp(buf);
if (!init_flag)
goto repl;
home = getenv("HOME");
strcpy(str, home);
strcat(str, "/nprolog/library/dcg.pl");
fp = fopen(str, "r");
if (fp != NULL) {
fclose(fp);
b_consult(list1(makeconst(str)), NIL, 0);
predicates = NIL;
}
strcpy(str, home);
strcat(str, "/nprolog/library/compiler.pl");
fp = fopen(str, "r");
if (fp != NULL) {
fclose(fp);
b_consult(list1(makeconst(str)), NIL, 0);
predicates = NIL;
}
strcpy(str, home);
strcat(str, "/nprolog/library/startup.pl");
fp = fopen(str, "r");
if (fp != NULL) {
fclose(fp);
b_consult(list1(makeconst(str)), NIL, 0);
}
while ((ch = getopt(argc, argv, "c:s:rhvn")) != -1) {
switch (ch) {
case 'c':
fp = fopen(optarg, "r");
if (fp != NULL)
fclose(fp);
else {
printf("Not exist %s\n", optarg);
exit(EXIT_FAILURE);
}
b_consult(list1(makeconst(optarg)), NIL, 0);
break;
case 's':
fp = fopen(optarg, "r");
if (fp != NULL)
fclose(fp);
else {
printf("Not exist %s\n", optarg);
exit(EXIT_FAILURE);
}
script_flag = 1;
b_consult(list1(makeconst(optarg)), NIL, 0);
exit(EXIT_SUCCESS);
case 'r':
repl_flag = 0;
break;
case 'v':
printf("N-Prolog Ver %1.2f\n", VERSION);
exit(EXIT_SUCCESS);
case 'h':
usage();
exit(EXIT_SUCCESS);
case 'n':
printf("N-Prolog runs with network mode.\n");
fp = fopen("network.pl", "r");
if (fp != NULL) {
fclose(fp);
b_consult(list1(makeconst("network.pl")), NIL, 0);
}
child_flag = 1;
init_parent();
init_receiver();
break;
default:
usage();
exit(EXIT_FAILURE);
}
}
if (init_flag) {
printf("N-Prolog Ver %1.2f\n", VERSION);
init_flag = 0;
}
repl:
if (ret == 0)
while (1) {
if (!child_flag) {
input_stream = standard_input;
output_stream = standard_output;
error_stream = standard_error;
init_repl();
printf("?- ");
fflush(stdout);
input = variable_to_call(readparse(0));
if (!repl_flag)
clear_input_buffer();
query(input, 0);
//sexp_flag = 1;print(input);
//printf("proof = %d\n", proof);
fflush(stdout);
} else if (child_flag) {
input_stream = standard_input;
output_stream = standard_output;
error_stream = standard_error;
init_repl();
input =
variable_to_call(convert_to_variable
(str_to_pred(receive_from_parent()),
0));
printf("Receive from parent ");
sprint(input);
printf("\n");
fflush(stdout);
child_busy_flag = 1;
query(input, 0);
child_busy_flag = 0;
printf("Send to parent ");
printf("\n");
fflush(stdout);
}
} else if (ret == 1) {
ret = 0;
goto repl;
} else {
if (shutdown_flag) {
printf("Shutting down the system...\n");
int ret = system("sudo shutdown now");
if (ret == -1)
error(SYSTEM_ERROR, "dp_close shatdown ", NIL, 0);
}
return 0;
}
}
void clear_input_buffer()
{
int c;
while ((c = getchar()) != '\n' && c != EOF) {
}
}
void reset(int i)
{
ctrl_c_flag = 1;
}
void init_repl(void)
{
int i, j;
stok.flag = GO;
nest = 0;
for (i = 0; i < THREADSIZE; i++) {
sp[i] = 0;
proof[i] = 0;
ac[i] = CELLSIZE + 1;
unbind(0, i);
cp[i] = 0;
}
for (i = 0; i <= thread_num; i++) {
wp[i] = wp_min[i];
}
ctrl_c_flag = 0;
fskip_flag = OFF;
sskip_flag = OFF;
xskip_flag = OFF;
semiskip_flag = OFF;
leap_point = NIL;
left_margin = 4;
big_pt0 = 0;
//initialize variant variable
for (i = 0; i < VARIANTSIZE; i++) {
for (j = 0; j < THREADSIZE; j++) {
variant[i][j] = UNBIND;
}
}
for (j = 0; j < THREADSIZE; j++) {
i = variables[j];
while (!nullp(i)) {
SET_CAR(car(i), UNBIND);
SET_CDR(car(i), UNBIND);
i = cdr(i);
}
}
//initialize spy-point trace-level
i = spy_list;
while (!nullp(i)) {
SET_TR(cadar(i), 0);
i = cdr(i);
}
}
void query(int x, int th)
{
int res;
// DCG syntax e.g. a-->b.
if (dcgp(x)) {
operate(x, th);
return;
}
//[file1,file2] -> consult(file1),consult(file2).
if (listp(x))
x = list_to_ope(x, th);
if (atomp(x) && !builtinp(x) && !compiledp(x))
x = makepred(GET_NAME(x));
if (wide_variable_p(x))
error(INSTANTATION_ERR, "?- ", x, th);
if (!callablep(x))
error(NOT_CALLABLE, "?- ", x, th);
variables[th] = listreverse(unique(varslist(x)));
res = prove_all(addask(x, th), sp[th], th);
if (!child_flag) {
ESCRST;
print(res);
printf("\n");
} else {
bridge_flag = 1;
if (res == YES) {
printstr("dp_countup(");
printint(proof[th]);
printstr("),");
printstr("true.\n");
} else {
printstr("dp_countup(");
printint(proof[th]);
printstr("),");
printstr("fail.\n");
}
bridge_flag = 0;
send_to_parent_buffer();
}
return;
}
void query_break(int x, int th)
{
int res;
// DCG syntax e.g. a-->b.
if (dcgp(x)) {
operate(x, th);
return;
}
//[file1,file2] -> consult(file1),consult(file2).
if (listp(x))
x = list_to_ope(x, th);
if (atomp(x) && !builtinp(x) && !compiledp(x))
x = makepred(GET_NAME(x));
if (wide_variable_p(x))
error(INSTANTATION_ERR, "?= ", x, th);
if (!callablep(x)) {
error(NOT_CALLABLE, "?= ", x, th);
}
variables_save[th] = variables[th];
variables[th] = listreverse(unique(varslist(x)));
res = prove_all(addask(x, th), sp[th], th);
variables[th] = variables_save[th];
ESCRST;
print(res);
printf("\n");
return;
}
int list_to_ope(int x, int th)
{
if (nullp(x))
error(SYNTAX_ERR, "?-", x, 0);
else if (nullp(cdr(x))) {
if (atomp(car(x)))
return (list2(makeatom("consult", SYS), car(x)));
else if (caar(x) == makeatom("-", OPE))
return (list2(makeatom("reconsult", SYS), cadr(car(x))));
} else {
if (atomp(car(x)))
return (list3(makeatom(",", OPE),
list2(makeatom("consult", SYS), car(x)),
list_to_ope(cdr(x), th)));
else if (caar(x) == makeatom("-", OPE))
return (list3(makeatom(",", OPE),
list2(makeatom("reconsult", SYS), cadr(car(x))),
list_to_ope(cdr(x), th)));
}
return (NIL);
}
int addask(int x, int th)
{
return (addtail_body(makeatom("%ask", SYS), x, th));
}
int addtail_body(int x, int y, int th)
{
if (nullp(y))
return (x);
else if (!conjunctionp(y))
return (wlist3(AND, y, x, th));
else
return (wlist3
(car(y), cadr(y), addtail_body(x, caddr(y), th), th));
}
int prove_all(int goals, int bindings, int th)
{
int res;
if (nullp(goals))
return (YES);
else if (car(goals) != AND)
return (prove(goals, bindings, NIL, th));
else {
if (!has_cut_p(goals)) {
return (prove(cadr(goals), bindings, caddr(goals), th));
} else {
if (prove_all(before_cut(goals), bindings, th) == YES) {
res = prove_all(after_cut(goals), sp[th], th);
if (res == YES)
return (YES);
else if (res == NO)
return (NFALSE);
} else
return (NO);
}
}
return (NO);
}
int prove(int goal, int bindings, int rest, int th)
{
int clause, clauses, clause1, varlis, save1, save2, res;
proof[th]++;
if (ctrl_c_flag) {
printf("ctrl+C\n");
longjmp(buf, 1);
}
if (pause_flag) {
printf("pause\n");
while (1) {
sleep(1);
if (!pause_flag)
break;
}
printf("resume\n");
}
if (nest > 40000)
error(RESOURCE_ERR, "prove recursion over max", NIL, th);
goal = deref(goal, th);
if (nullp(goal)) {
return (prove_all(rest, bindings, th));
} else if (builtinp(goal)) {
if (atomp(goal)) {
if ((res = (GET_SUBR(goal)) (NIL, rest, th)) == YES)
return (YES);
return (res);
} else {
if ((res = (GET_SUBR(car(goal))) (cdr(goal), rest, th)) == YES)
return (YES);
return (res);
}
} else if (compiledp(goal)) {
if (atomp(goal)) {
if ((GET_SUBR(goal)) (NIL, rest, th) == YES)
return (YES);
return (NO);
} else {
if ((GET_SUBR(car(goal))) (cdr(goal), rest, th) == YES)
return (YES);
return (NO);
}
} else if (predicatep(goal) || user_operation_p(goal)) {
//trace
if (debug_flag == ON)
prove_trace(DBCALL, goal, bindings, rest, th);
if (atomp(goal))
clauses = GET_CAR(goal);
else
clauses = GET_CAR(car(goal));
if (clauses == NIL) {
if (exist_flag == YES)
error(EXISTENCE_ERR, "", goal, th);
else if (exist_flag == NO)
return (NO);
}
while (!nullp(clauses)) {
save1 = wp[th];
save2 = ac[th];
clause = car(clauses);
clauses = cdr(clauses);
varlis = GET_VAR(clause);
pthread_mutex_lock(&mutex1);
assign_variant(varlis, th);
clause1 = walpha_conversion(clause, th);
release_variant(varlis);
pthread_mutex_unlock(&mutex1);
// case of predicate
if (predicatep(clause1) || user_operation_p(clause1)) {
if (unify(goal, clause1, th) == YES) {
if (prove_all(rest, sp[th], th) == YES) {
//trace
if (debug_flag == ON)
prove_trace(DBEXIT, goal, bindings, rest, th);
return (YES);
} else {
//trace
if (debug_flag == ON)
prove_trace(DBFAIL, goal, bindings, rest, th);
}
}
}
// case of clause
else {
if (unify(goal, (cadr(clause1)), th) == YES) {
clause1 = addtail_body(rest, caddr(clause1), th);
nest++;
if ((res = prove_all(clause1, sp[th], th)) == YES) {
nest--;
//trace
if (debug_flag == ON)
prove_trace(DBEXIT, goal, bindings, rest, th);
return (YES);
} else {
nest--;
if (res == NFALSE) { // when after cut occurs NO
//trace
if (debug_flag == ON)
prove_trace(DBCUTFAIL, goal, bindings,
rest, th);
wp[th] = save1;
ac[th] = save2;
unbind(bindings, th);
return (NO);
}
}
}
}
//trace
if (debug_flag == ON && !nullp(clauses))
prove_trace(DBREDO, goal, bindings, rest, th);
wp[th] = save1;
ac[th] = save2;
unbind(bindings, th);
}
//trace
if (debug_flag == ON)
prove_trace(DBFAIL, goal, bindings, rest, th);
} else if (disjunctionp(goal)) {
if (ifthenp(cadr(goal))) {
goal =
wcons(IFTHENELSE,
wcons(cadr(cadr(goal)),
wcons(caddr(cadr(goal)),
wcons(caddr(goal), NIL, th), th), th),
th);
// redefine goal = ifthenelse(if,then,else)
return (prove(goal, bindings, rest, th));
} else
if ((res =
prove_all(addtail_body(rest, cadr(goal), th), bindings,
th))
== YES)
return (YES);
else {
if (res == NFALSE) {
unbind(bindings, th);
return (NO);
}
unbind(bindings, th);
if (prove_all
(addtail_body(rest, caddr(goal), th), bindings, th) == YES)
return (YES);
else {
unbind(bindings, th);
return (NO);
}
}
unbind(bindings, th);
return (NO);
}
return (NO);
}
int before_cut(int x)
{
if (x == CUT)
return (NIL);
else if (!conjunctionp(x))
return (x);
else if (conjunctionp(x) && caddr(x) == CUT)
return (cadr(x));
else if (cadr(x) == CUT)
return (NIL);
else if (conjunctionp(caddr(x)) && cadr(caddr(x)) == CUT)
return (cadr(x));
else
return (wlist3(AND, cadr(x), before_cut(caddr(x)), 0));
}
int after_cut(int x)
{
if (x == CUT)
return (NIL);
else if (!conjunctionp(x))
return (x);
else if (cadr(x) == CUT)
return (caddr(x));
else
return (after_cut(caddr(x)));
}
void prove_trace(int port, int goal, int bindings, int rest, int th)
{
int spy, leap;
if (port == DBCALL) {
if (trace_flag != OFF) {
spy = spypointp(goal);
leap = leappointp(goal);
if (spy && !leap && xskip_flag == OFF)
printf("** ");
else if (spy && !leap && xskip_flag == ON)
printf("*> ");
else if (!spy && xskip_flag == OFF)
return;
else if (fskip_flag == ON)
return;
else if (qskip_flag == ON)
return;
else if (sskip_flag == ON)
return;
else if (xskip_flag == ON) {
if (!spy)
printf("> ");
sskip_flag = OFF;
} else if (semiskip_flag == ON)
return;
if (leap)
return;
else
leap_point = NIL;
inctrace(goal);
printf("(%d) CALL: ", gettrace(goal));
print(goal);
port = DBCALL;
debugger(goal, bindings, rest);
}
} else if (port == DBREDO) {
if (trace_flag == FULL || trace_flag == TIGHT
|| trace_flag == HALF) {
spy = spypointp(goal);
leap = leappointp(goal);
if (spy && !leap && semiskip_flag == OFF)
printf("** ");
else if (spy && !leap && semiskip_flag == ON)
printf("*> ");
else if (!spy && semiskip_flag == OFF)
return;
else if (fskip_flag == ON)
return;
else if (qskip_flag == ON)
return;
else if (sskip_flag == ON)
return;
else if (xskip_flag == ON)
return;
else if (semiskip_flag == ON) {
if (spy) {
printf("> ");
semiskip_flag = OFF;
}
}
if (leap)
return;
else
leap_point = NIL;
printf("(%d) REDO: ", gettrace(goal));
print(goal);
port = DBREDO;
debugger(goal, bindings, rest);
}
} else if (port == DBFAIL) {
if (trace_flag == FULL || trace_flag == TIGHT) {
spy = spypointp(goal);
leap = leappointp(goal);
if (spy && !leap && fskip_flag == OFF && qskip_flag == OFF
&& sskip_flag == OFF)
printf("** ");
else if (spy && !leap
&& (fskip_flag == ON || qskip_flag == ON
|| qskip_flag == ON))
printf("*> ");
else if (!spy && fskip_flag == OFF && qskip_flag == OFF
&& sskip_flag == OFF)
return;
else if (fskip_flag == ON) {
printf("> ");
fskip_flag = OFF;
} else if (qskip_flag == ON) {
printf("> ");
qskip_flag = OFF;
} else if (sskip_flag == ON) {
printf("> ");
sskip_flag = OFF;
} else if (xskip_flag == ON)
return;
else if (semiskip_flag == ON)
return;
if (leap)
return;
else
leap_point = NIL;
printf("(%d) FAIL: ", gettrace(goal));
print(goal);
dectrace(goal);
port = DBFAIL;
debugger(goal, bindings, rest);
}
} else if (port == DBCUTFAIL) {
if (trace_flag == FULL || trace_flag == TIGHT) {
spy = spypointp(goal);
leap = leappointp(goal);
if (spy && !leap && fskip_flag == OFF && qskip_flag == OFF
&& sskip_flag == OFF)
printf("** ");
else if (spy && !leap
&& (fskip_flag == ON || qskip_flag == ON
|| qskip_flag == ON))
printf("*> ");
else if (!spy && fskip_flag == OFF && qskip_flag == OFF
&& sskip_flag == OFF)
return;
else if (fskip_flag == ON) {
printf("> ");
fskip_flag = OFF;
} else if (qskip_flag == ON) {
printf("> ");
qskip_flag = OFF;
} else if (sskip_flag == ON) {
printf("> ");
sskip_flag = OFF;
} else if (xskip_flag == ON)
return;
else if (semiskip_flag == ON)
return;
if (leap)
return;
else
leap_point = NIL;
printf("(%d) CUTFAIL: ", gettrace(goal));
print(goal);
clrtrace(goal);
port = DBFAIL;
debugger(goal, bindings, rest);
}
} else if (port == DBEXIT) {
if (trace_flag == FULL) {
spy = spypointp(goal);
leap = leappointp(goal);
if (spy && !leap && qskip_flag == OFF && sskip_flag == OFF
&& xskip_flag == OFF)
printf("** ");
else if (spy && !leap
&& (qskip_flag == ON || sskip_flag == ON
|| xskip_flag == ON))
printf("*> ");
else if (!spy && qskip_flag == OFF && sskip_flag == OFF
&& xskip_flag == OFF)
return;
else if (fskip_flag == ON)
return;
else if (qskip_flag == ON) {
printf("> ");
qskip_flag = OFF;
} else if (sskip_flag == ON) {
printf("> ");
sskip_flag = OFF;
} else if (xskip_flag == ON) {
printf("-> ");
qskip_flag = OFF;
} else if (semiskip_flag == ON)
return;
if (leap)
return;
else
leap_point = NIL;
printf("(%d) EXIT: ", gettrace(goal));
print(goal);
dectrace(goal);
port = DBEXIT;
debugger(goal, bindings, rest);
}
}
}
void inctrace(int goal)
{
if (atomp(goal))
SET_TR(goal, GET_TR(goal) + 1);
else
SET_TR(car(goal), GET_TR(car(goal)) + 1);
}
void dectrace(int goal)
{
if (atomp(goal))
SET_TR(goal, GET_TR(goal) - 1);
else
SET_TR(car(goal), GET_TR(car(goal)) - 1);
}
void clrtrace(int goal)
{
if (atomp(goal))
SET_TR(goal, 0);
else
SET_TR(car(goal), 0);
}
int gettrace(int goal)
{
if (atomp(goal))
return (GET_TR(goal));