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limboole.c
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limboole.c
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/*------------------------------------------------------------------------*/
/* (C)2002-2003, Armin Biere, ETH Zurich, 2005, 2012, Armin Biere, JKU Linz.
* QBF extension by Martina Seidl JKU Linz (2020)
* Support for multiple Solvers and WebAssembly (Emscripten)
by Max Heisinger JKU Linz (2020)
All rights reserved. Redistribution and use in source and binary forms, with
or without modification, are permitted provided that the following
conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by Armin Biere, ETH Zurich,
and JKU Linz.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\*------------------------------------------------------------------------*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
/*------------------------------------------------------------------------*/
#ifdef LIMBOOLE_USE_LINGELING
#include "lglib.h"
#else
typedef struct LGL LGL;
#endif
#ifdef LIMBOOLE_USE_PICOSAT
#include <picosat.h>
#else
typedef struct PicoSAT PicoSAT;
#endif
#ifdef LIMBOOLE_USE_DEPQBF
#include <qdpll.h>
#else
typedef struct QDPLL QDPLL;
#endif
/*------------------------------------------------------------------------*/
/* These are the node types we support. They are ordered in decreasing
* priority: if a parent with type t1 has a child with type t2 and t1 > t2,
* then pretty printing the parent requires parentheses. See 'pp_aux' for
* more details.
*/
enum Type
{
VAR = 0,
LP = 1,
RP = 2,
NOT = 3,
AND = 4,
OR = 5,
IMPLIES = 6,
SEILPMI = 7,
IFF = 8,
DONE = 9,
ERROR = 10,
ALL = 11,
EX = 12
};
/*------------------------------------------------------------------------*/
typedef enum Type Type;
typedef struct Node Node;
typedef union Data Data;
typedef struct PNode PNode;
/*------------------------------------------------------------------------*/
union Data
{
char *as_name; /* variable data */
Node *as_child[2]; /* operator data */
};
/*------------------------------------------------------------------------*/
struct Node
{
Type type;
int idx; /* tseitin index */
Node *next; /* collision chain in hash table */
Node *next_inserted; /* chronological list of hash table */
Data data;
};
struct PNode
{
Type type;
Node *node;
PNode *next;
};
/*------------------------------------------------------------------------*/
typedef struct Mgr Mgr;
struct Mgr
{
unsigned nodes_size;
unsigned nodes_count;
int idx;
PNode *first_prefix;
Node **nodes;
Node *first;
Node *last;
Node *root;
char *buffer;
char *name;
unsigned buffer_size;
unsigned buffer_count;
int saved_char;
int saved_char_is_valid;
int last_y;
int verbose;
int use_picosat;
int use_lingeling;
int use_depqbf;
unsigned x;
unsigned y;
FILE *in;
FILE *log;
FILE *out;
int close_in;
int close_log;
int close_out;
Type token;
unsigned token_x;
unsigned token_y;
Node **idx2node;
int check_satisfiability;
int dump;
int qdump;
PicoSAT * picosat;
LGL * lgl;
QDPLL *qdpll;
int inner, outer;
int free_vars;
char *input;
unsigned int input_length;
unsigned int input_pos;
};
/*------------------------------------------------------------------------*/
static unsigned
hash_var (Mgr * mgr, const char *name)
{
unsigned res, tmp;
const char *p;
res = 0;
for (p = name; *p; p++)
{
tmp = res & 0xf0000000;
res <<= 4;
res += *p;
if (tmp)
res ^= (tmp >> 28);
}
res &= (mgr->nodes_size - 1);
assert (res < mgr->nodes_size);
return res;
}
/*------------------------------------------------------------------------*/
static unsigned
hash_op (Mgr * mgr, Type type, Node * c0, Node * c1)
{
unsigned res;
res = (unsigned) type;
res += 4017271 * (unsigned) (long) c0;
res += 70200511 * (unsigned) (long) c1;
res &= (mgr->nodes_size - 1);
assert (res < mgr->nodes_size);
return res;
}
/*------------------------------------------------------------------------*/
static unsigned
hash (Mgr * mgr, Type type, void *c0, Node * c1)
{
if (type == VAR)
return hash_var (mgr, (char *) c0);
else
return hash_op (mgr, type, c0, c1);
}
/*------------------------------------------------------------------------*/
static int
eq_var (Node * n, const char *str)
{
return n->type == VAR && !strcmp (n->data.as_name, str);
}
/*------------------------------------------------------------------------*/
static int
eq_op (Node * n, Type type, Node * c0, Node * c1)
{
return n->type == type && n->data.as_child[0] == c0
&& n->data.as_child[1] == c1;
}
/*------------------------------------------------------------------------*/
static int
eq (Node * n, Type type, void *c0, Node * c1)
{
if (type == VAR)
return eq_var (n, (char *) c0);
else
return eq_op (n, type, c0, c1);
}
/*------------------------------------------------------------------------*/
static Node **
find (Mgr * mgr, Type type, void *c0, Node * c1)
{
Node **p, *n;
unsigned h;
h = hash (mgr, type, c0, c1);
for (p = mgr->nodes + h; (n = *p); p = &n->next)
if (eq (n, type, c0, c1))
break;
return p;
}
/*------------------------------------------------------------------------*/
static void
enlarge_nodes (Mgr * mgr)
{
Node **old_nodes, *p, *next;
unsigned old_nodes_size, h, i;
old_nodes = mgr->nodes;
old_nodes_size = mgr->nodes_size;
mgr->nodes_size *= 2;
mgr->nodes = (Node **) calloc (mgr->nodes_size, sizeof (Node *));
for (i = 0; i < old_nodes_size; i++)
{
for (p = old_nodes[i]; p; p = next)
{
next = p->next;
if (p->type == VAR)
h = hash_var (mgr, p->data.as_name);
else
h =
hash_op (mgr, p->type, p->data.as_child[0],
p->data.as_child[1]);
p->next = mgr->nodes[h];
mgr->nodes[h] = p;
}
}
free (old_nodes);
}
/*------------------------------------------------------------------------*/
static void
insert (Mgr * mgr, Node * node)
{
if (mgr->last)
mgr->last->next_inserted = node;
else
mgr->first = node;
mgr->last = node;
mgr->nodes_count++;
}
/*------------------------------------------------------------------------*/
static Node *
var (Mgr * mgr, const char *str)
{
Node **p, *n;
if (mgr->nodes_size <= mgr->nodes_count)
enlarge_nodes (mgr);
p = find (mgr, VAR, (void *) str, 0);
n = *p;
if (!n)
{
n = (Node *) malloc (sizeof (*n));
memset (n, 0, sizeof (*n));
n->type = VAR;
n->data.as_name = strdup (str);
*p = n;
insert (mgr, n);
}
return n;
}
/*------------------------------------------------------------------------*/
static Node *
op (Mgr * mgr, Type type, Node * c0, Node * c1)
{
Node **p, *n;
if (mgr->nodes_size <= mgr->nodes_count)
enlarge_nodes (mgr);
p = find (mgr, type, c0, c1);
n = *p;
if (!n)
{
n = (Node *) malloc (sizeof (*n));
memset (n, 0, sizeof (*n));
n->type = type;
n->data.as_child[0] = c0;
n->data.as_child[1] = c1;
*p = n;
insert (mgr, n);
}
return n;
}
/*------------------------------------------------------------------------*/
static Mgr *
init (void)
{
Mgr *res;
res = (Mgr *) malloc (sizeof (*res));
memset (res, 0, sizeof (*res));
res->nodes_size = 2;
res->nodes = (Node **) calloc (res->nodes_size, sizeof (Node *));
res->buffer_size = 2;
res->buffer = (char *) malloc (res->buffer_size);
res->in = stdin;
res->log = stderr;
res->out = stdout;
res->input_pos = 0;
return res;
}
/*------------------------------------------------------------------------*/
static void
connect_solver (Mgr * mgr)
{
assert (mgr->use_lingeling || mgr->use_picosat || mgr->use_depqbf);
#ifdef LIMBOOLE_USE_PICOSAT
if (mgr->use_picosat)
{
assert (!mgr->picosat);
mgr->picosat = picosat_init ();
if (mgr->verbose)
picosat_set_verbosity (mgr->picosat, 1);
picosat_set_prefix (mgr->picosat, "c PicoSAT ");
picosat_set_output (mgr->picosat, mgr->log);
}
#endif
#ifdef LIMBOOLE_USE_LINGELING
if (mgr->use_lingeling)
{
assert (!mgr->lgl);
mgr->lgl = lglinit ();
if (mgr->verbose)
lglsetopt(mgr->lgl, "verbose", 1);
lglsetprefix(mgr->lgl, "c Lingeling ");
lglsetout(mgr->lgl, mgr->log);
}
#endif
#ifdef LIMBOOLE_USE_DEPQBF
if (mgr->use_depqbf)
{
assert (!mgr->qdpll);
mgr->qdpll = qdpll_create ();
qdpll_configure(mgr->qdpll, "--no-dynamic-nenofex");
}
#endif
assert (mgr->lgl || mgr->picosat || mgr->qdpll);
}
/*------------------------------------------------------------------------*/
static void
release (Mgr * mgr)
{
Node *p, *next;
PNode *pp, *pnext;
#ifdef LIMBOOLE_USE_PICOSAT
if (mgr->picosat)
picosat_reset (mgr->picosat);
#endif
#ifdef LIMBOOLE_USE_LINGELING
if (mgr->lgl)
lglrelease (mgr->lgl);
#endif
#ifdef LIMBOOLE_USE_DEPQBF
if (mgr->qdpll)
qdpll_delete (mgr->qdpll);
#endif
for (p = mgr->first; p; p = next)
{
next = p->next_inserted;
if (p->type == VAR)
free (p->data.as_name);
free (p);
}
for (pp = mgr->first_prefix; pp; pp = pnext) {
pnext = pp->next;
free (pp);
}
if (mgr->close_in)
fclose (mgr->in);
if (mgr->close_out)
fclose (mgr->out);
if (mgr->close_log)
fclose (mgr->log);
free (mgr->idx2node);
free (mgr->nodes);
free (mgr->buffer);
free (mgr);
}
/*------------------------------------------------------------------------*/
static void
print_token (Mgr * mgr)
{
switch (mgr->token)
{
case VAR:
fputs (mgr->buffer, mgr->log);
break;
case LP:
fputc ('(', mgr->log);
break;
case RP:
fputc (')', mgr->log);
break;
case NOT:
fputc ('!', mgr->log);
break;
case AND:
fputc ('&', mgr->log);
break;
case OR:
fputc ('|', mgr->log);
break;
case IMPLIES:
fputs ("->", mgr->log);
break;
case SEILPMI:
fputs ("<-", mgr->log);
break;
case IFF:
fputs ("<->", mgr->log);
break;
default:
assert (mgr->token == DONE);
fputs ("EOF", mgr->log);
break;
}
}
/*------------------------------------------------------------------------*/
static void
parse_error (Mgr * mgr, const char *fmt, ...)
{
va_list ap;
char *name;
name = mgr->name ? mgr->name : "<stdin>";
fprintf (mgr->log, "%s:%u:%u: ", name, mgr->token_x + 1, mgr->token_y);
if (mgr->token == ERROR)
fputs ("scan error: ", mgr->log);
else
{
fputs ("parse error at '", mgr->log);
print_token (mgr);
fputs ("' ", mgr->log);
}
va_start (ap, fmt);
vfprintf (mgr->log, fmt, ap);
va_end (ap);
fputc ('\n', mgr->log);
}
/*------------------------------------------------------------------------*/
static int
is_var_letter (int ch)
{
if (isalnum (ch))
return 1;
switch (ch)
{
case '-':
case '_':
case '.':
case '[':
case ']':
case '$':
case '@':
return 1;
default:
return 0;
}
}
/*------------------------------------------------------------------------*/
static void
enlarge_buffer (Mgr * mgr)
{
mgr->buffer_size *= 2;
mgr->buffer = (char *) realloc (mgr->buffer, mgr->buffer_size);
}
/*------------------------------------------------------------------------*/
static int next_char(Mgr *mgr) {
int res;
mgr->last_y = mgr->y;
if (mgr->saved_char_is_valid) {
mgr->saved_char_is_valid = 0;
res = mgr->saved_char;
} else {
if (mgr->input == NULL) {
res = fgetc(mgr->in);
} else {
if (mgr->input_pos == mgr->input_length)
return EOF;
res = mgr->input[mgr->input_pos++];
}
}
if (res == '\n') {
mgr->x++;
mgr->y = 0;
} else
mgr->y++;
return res;
}
/*------------------------------------------------------------------------*/
static void
unget_char (Mgr * mgr, int ch)
{
assert (!mgr->saved_char_is_valid);
mgr->saved_char_is_valid = 1;
mgr->saved_char = ch;
if (ch == '\n')
{
mgr->x--;
mgr->y = mgr->last_y;
}
else
mgr->y--;
}
/*------------------------------------------------------------------------*/
static void
next_token (Mgr * mgr)
{
int ch;
mgr->token = ERROR;
ch = next_char (mgr);
RESTART_NEXT_TOKEN:
while (isspace ((int) ch))
ch = next_char (mgr);
if (ch == '%')
{
while ((ch = next_char (mgr)) != '\n' && ch != EOF)
;
goto RESTART_NEXT_TOKEN;
}
mgr->token_x = mgr->x;
mgr->token_y = mgr->y;
if (ch == EOF)
mgr->token = DONE;
else if (ch == '<')
{
ch = next_char (mgr);
if (ch == '-')
{
ch = next_char (mgr);
if (ch == '>')
mgr->token = IFF;
else
{
unget_char (mgr, ch);
mgr->token = SEILPMI;
}
}
else
parse_error (mgr, "expected '-' after '<'");
}
else if (ch == '-')
{
ch = next_char (mgr);
if (ch == '>')
mgr->token = IMPLIES;
else
{
unget_char (mgr, ch);
mgr->token = NOT;
}
}
else if (ch == '&')
{
mgr->token = AND;
}
else if (ch == '?' && mgr->use_depqbf)
{
mgr->token = EX;
}
else if (ch == '#' && mgr->use_depqbf)
{
mgr->token = ALL;
}
else if (ch == '|' || ch == '/')
{
mgr->token = OR;
}
else if (ch == '!' || ch == '~')
{
mgr->token = NOT;
}
else if (ch == '(')
{
mgr->token = LP;
}
else if (ch == ')')
{
mgr->token = RP;
}
else if (is_var_letter (ch))
{
mgr->buffer_count = 0;
while (is_var_letter (ch))
{
if (mgr->buffer_size <= mgr->buffer_count + 1)
enlarge_buffer (mgr);
mgr->buffer[mgr->buffer_count++] = ch;
ch = next_char (mgr);
}
unget_char (mgr, ch);
mgr->buffer[mgr->buffer_count] = 0;
if (mgr->buffer[mgr->buffer_count - 1] == '-')
parse_error (mgr, "variable '%s' ends with '-'", mgr->buffer);
else
mgr->token = VAR;
}
else
parse_error (mgr, "invalid character '%c'", ch);
}
/*------------------------------------------------------------------------*/
static Node *parse_expr (Mgr *);
/*------------------------------------------------------------------------*/
static Node *
parse_basic (Mgr * mgr)
{
Node *child;
Node *res;
res = 0;
if (mgr->token == LP)
{
next_token (mgr);
child = parse_expr (mgr);
if (mgr->token != RP)
{
if (mgr->token != ERROR)
parse_error (mgr, "expected ')'");
}
else
res = child;
next_token (mgr);
}
else if (mgr->token == VAR)
{
res = var (mgr, mgr->buffer);
next_token (mgr);
}
else if (mgr->token != ERROR)
parse_error (mgr, "expected variable or '('");
return res;
}
/*------------------------------------------------------------------------*/
static Node *
parse_not (Mgr * mgr)
{
Node *child, *res;
if (mgr->token == NOT)
{
next_token (mgr);
child = parse_not (mgr);
if (child)
res = op (mgr, NOT, child, 0);
else
res = 0;
}
else
res = parse_basic (mgr);
return res;
}
/*------------------------------------------------------------------------*/
static Node *
parse_associative_op (Mgr * mgr, Type type, Node * (*lower) (Mgr *))
{
Node *res, *child;
int done;
res = 0;
done = 0;
do
{
child = lower (mgr);
if (child)
{
res = res ? op (mgr, type, res, child) : child;
if (mgr->token == type)
next_token (mgr);
else
done = 1;
}
else
res = 0;
}
while (res && !done);
return res;
}
/*------------------------------------------------------------------------*/
static Node *
parse_and (Mgr * mgr)
{
return parse_associative_op (mgr, AND, parse_not);
}
/*------------------------------------------------------------------------*/
static Node *
parse_or (Mgr * mgr)
{
return parse_associative_op (mgr, OR, parse_and);
}
/*------------------------------------------------------------------------*/
static Node *
parse_implies (Mgr * mgr)
{
Node *l, *r;
Type token;
if (!(l = parse_or (mgr)))
return 0;
token = mgr->token;
if (token != IMPLIES && token != SEILPMI)
return l;
next_token (mgr);
if (!(r = parse_or (mgr)))
return 0;
return op (mgr, token, l, r);
}
/*------------------------------------------------------------------------*/
static Node *
parse_iff (Mgr * mgr)
{
return parse_associative_op (mgr, IFF, parse_implies);
}
/*------------------------------------------------------------------------*/
#ifdef LIMBOOLE_USE_DEPQBF
static int parse_prefix(Mgr *mgr) {
Type token;
Node *v;
PNode *p, *n = NULL;
int scope = EX;
if (mgr->token == ERROR)
return 0;
int outer_scope_quantor =
mgr->check_satisfiability == 1 ? QDPLL_QTYPE_EXISTS : QDPLL_QTYPE_FORALL;
mgr->outer = mgr->inner = qdpll_new_scope(mgr->qdpll, outer_scope_quantor);
while ((mgr->token == ALL) || (mgr->token == EX)) {
token = mgr->token;
next_token(mgr);
if (mgr->token != VAR)
return 0;
v = var(mgr, mgr->buffer);
v->idx = ++mgr->idx;
p = (PNode *)malloc(sizeof(*p));
p->node = v;
p->type = mgr->token;
p->next = NULL;
if (n) {
n->next = p;
} else {
mgr->first_prefix = n = p;
}
n = p;
if (scope != token) {
if (scope)
qdpll_add(mgr->qdpll, 0);
mgr->inner = qdpll_new_scope(
mgr->qdpll, token == ALL ? QDPLL_QTYPE_FORALL : QDPLL_QTYPE_EXISTS);
scope = token;
}
qdpll_add(mgr->qdpll, v->idx);
next_token(mgr);
}
if (scope)
qdpll_add(mgr->qdpll, 0);
if (scope == ALL) {
mgr->inner = qdpll_new_scope(mgr->qdpll, QDPLL_QTYPE_EXISTS);
qdpll_add(mgr->qdpll, 0);
}
return 1;
}
#endif
/*------------------------------------------------------------------------*/
static Node *
parse_expr (Mgr * mgr)
{
return parse_iff (mgr);
}
/*------------------------------------------------------------------------*/
static int
parse (Mgr * mgr)
{
if (mgr->token == ERROR)
return 0;
if (!(mgr->root = parse_expr (mgr)))
return 0;
if (mgr->token == DONE)
return 1;
if (mgr->token != ERROR)
parse_error (mgr, "expected operator or EOF");
return 0;
}
/*------------------------------------------------------------------------*/
static void
add_lit (Mgr * mgr, int lit)
{
#ifdef LIMBOOLE_USE_PICOSAT
if (mgr->picosat)
picosat_add (mgr->picosat, lit);
#endif
#ifdef LIMBOOLE_USE_LINGELING
if (mgr->lgl)
lgladd (mgr->lgl, lit);
#endif
#ifdef LIMBOOLE_USE_DEPQBF
if (mgr->qdpll)
qdpll_add(mgr->qdpll, lit);
#endif
}
/*------------------------------------------------------------------------*/
static void
add_clause (Mgr * mgr, int * clause)
{
const int * p;
for (p = clause; *p; p++)
{
add_lit (mgr, *p);
if (mgr->dump)
fprintf (mgr->out, "%d ", *p);
}
add_lit (mgr, 0);
if (mgr->dump)
fprintf (mgr->out, "0\n");
}
/*------------------------------------------------------------------------*/
static void
unit_clause (Mgr * mgr, int a)
{
int clause[2];
clause[0] = a;
clause[1] = 0;
add_clause (mgr, clause);
}
/*------------------------------------------------------------------------*/