diff options
Diffstat (limited to 'src/prop/bvpicosat')
| -rw-r--r-- | src/prop/bvpicosat/LICENSE | 20 | ||||
| -rw-r--r-- | src/prop/bvpicosat/Makefile.am | 24 | ||||
| -rw-r--r-- | src/prop/bvpicosat/Makefile.in | 633 | ||||
| -rw-r--r-- | src/prop/bvpicosat/NEWS | 93 | ||||
| -rw-r--r-- | src/prop/bvpicosat/README | 5 | ||||
| -rw-r--r-- | src/prop/bvpicosat/VERSION | 1 | ||||
| -rw-r--r-- | src/prop/bvpicosat/app.c | 923 | ||||
| -rw-r--r-- | src/prop/bvpicosat/config.h | 3 | ||||
| -rwxr-xr-x | src/prop/bvpicosat/configure | 151 | ||||
| -rw-r--r-- | src/prop/bvpicosat/main.c | 90 | ||||
| -rw-r--r-- | src/prop/bvpicosat/makefile | 43 | ||||
| -rw-r--r-- | src/prop/bvpicosat/makefile.in | 43 | ||||
| -rwxr-xr-x | src/prop/bvpicosat/mkconfig | 35 | ||||
| -rw-r--r-- | src/prop/bvpicosat/picomus.c | 340 | ||||
| -rw-r--r-- | src/prop/bvpicosat/picosat.c | 7731 | ||||
| -rw-r--r-- | src/prop/bvpicosat/picosat.h | 484 | ||||
| -rw-r--r-- | src/prop/bvpicosat/version.c | 14 |
17 files changed, 10633 insertions, 0 deletions
diff --git a/src/prop/bvpicosat/LICENSE b/src/prop/bvpicosat/LICENSE new file mode 100644 index 000000000..b2483af20 --- /dev/null +++ b/src/prop/bvpicosat/LICENSE @@ -0,0 +1,20 @@ +Copyright (c) 2006 - 2010, Armin Biere, Johannes Kepler University. + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to +deal in the Software without restriction, including without limitation the +rights to use, copy, modify, merge, publish, distribute, sublicense, and/or +sell copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS +IN THE SOFTWARE. + diff --git a/src/prop/bvpicosat/Makefile.am b/src/prop/bvpicosat/Makefile.am new file mode 100644 index 000000000..c31a3824c --- /dev/null +++ b/src/prop/bvpicosat/Makefile.am @@ -0,0 +1,24 @@ +AM_CPPFLAGS = \ + -D__BUILDING_CVC4LIB \ + -D __STDC_LIMIT_MACROS \ + -D __STDC_FORMAT_MACROS \ + -I@srcdir@/ -I@srcdir@/../.. -I@srcdir@/../../.. -I@builddir@/../../.. -I@srcdir@/../../../include +AM_CXXFLAGS = -Wall -Wno-parentheses -Wno-unknown-pragmas $(FLAG_VISIBILITY_HIDDEN) + +noinst_LTLIBRARIES = libpicosat.la +libpicosat_la_SOURCES = \ + app.c \ + picosat.h \ + picosat.c \ + picomus.c \ + version.c + +EXTRA_DIST = \ + main.c \ + README \ + LICENSE \ + NEWS \ + VERSION \ + configure \ + mkconfig \ + makefile.in diff --git 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exceeded. +.NOEXPORT: diff --git a/src/prop/bvpicosat/NEWS b/src/prop/bvpicosat/NEWS new file mode 100644 index 000000000..ea3e1ce26 --- /dev/null +++ b/src/prop/bvpicosat/NEWS @@ -0,0 +1,93 @@ +news for release 936 since 935 +------------------------------ + +* simple minimal unsatisfiable core (MUS) extractor 'picomus' + (example for using 'picosat_mus_assumptions' and 'picosat_coreclause') + +* added 'picosat_mus_assumptions' + +* added 'picosat_{set_}propagations' + +* new 'int' return value for 'picosat_enable_trace_generation' to + check for trace code being compiled + +news for release 935 since 926 +------------------------------ + +* added 'picosat_failed_assumptions' (plural) + +* new '-A <failedlits>' command line option + +* fixed failed assumption issues + +* added 'picosat_remove_learned' + +* added 'picosat_reset_{phases,scores}' + +* added 'picosat_set_less_important_lit' + +* added 'picosat_res' + +news for release 926 since 846 +------------------------------ + +* random initial phase (API of 'picosat_set_default_phase' changed) + +* fixed accumulative failed assumption (multiple times) + +* fixed missing original clause in core generation with assumptions + +* fixed debugging code for memory allocation + +* shared library in addition to static library + +* removed potential UNKNOWN result without decision limit + +* added picosat_set_more_important_lit + +* added picosat_coreclause + +* propagation of binary clauses until completion + +* fixed API usage 'assume;sat;sat' + +* literals move to front (LMTF) during traversal of visited clauses + +* switched from inner/outer to Luby style restart scheduling + +* less agressive reduce schedule + +* replaced watched literals with head and tail pointers + +* add 'picosat_failed_assumption', which allows to avoid tracing and core + generation, if one is only interested in assumptions in the core + +* fixed a BUG in the generic iterator code of clauses + (should rarely happen unless you use a very sophisticated malloc lib) + +news for release 846 since 632 +------------------------------ + +* cleaned up assumption handling (actually removed buggy optimization) + +* incremental core generation + +* experimental 'all different constraint' handling as in our FMCAD'08 paper + +* new API calls: + + - picosat_add_ado_lit (add all different object literal) + - picosat_deref_top_level (deref top level assignment) + - picosat_changed (check whether extension was possible) + - picosat_measure_all_calls (per default do not measure adding time) + - picosat_set_prefix (set prefix for messages) + +* 64 bit port (and compilation options) + +* optional NVSIDS visualization code + +* resource controlled failed literal implementation + +* disconnect long clauses satisfied at lower decision level + +* controlling restarts diff --git a/src/prop/bvpicosat/README b/src/prop/bvpicosat/README new file mode 100644 index 000000000..89d6ea5f6 --- /dev/null +++ b/src/prop/bvpicosat/README @@ -0,0 +1,5 @@ +These are the sources of the PicoSAT solver. +The preprocessor is not included. +To compile run './configure && make'. +The API is document in 'picosat.h'. +See also 'NEWS' and 'LICENSE'. diff --git a/src/prop/bvpicosat/VERSION b/src/prop/bvpicosat/VERSION new file mode 100644 index 000000000..10c7f0b94 --- /dev/null +++ b/src/prop/bvpicosat/VERSION @@ -0,0 +1 @@ +936 diff --git a/src/prop/bvpicosat/app.c b/src/prop/bvpicosat/app.c new file mode 100644 index 000000000..667a2ac8c --- /dev/null +++ b/src/prop/bvpicosat/app.c @@ -0,0 +1,923 @@ +#include "picosat.h" + +#include <assert.h> +#include <string.h> +#include <ctype.h> +#include <stdio.h> + +#define GUNZIP "gunzip -c %s" +#define GZIP "gzip -c -f > %s" + +FILE * popen (const char *, const char*); +int pclose (FILE *); + +static int lineno; +static FILE *input; +static int inputid; +static FILE *output; +static int verbose; +static int sargc; +static char ** sargv; +static char buffer[100]; +static char *bhead = buffer; +static const char *eob = buffer + 80; +static FILE * incremental_rup_file; + +extern void picosat_enter (void); +extern void picosat_leave (void); + +static char page[4096]; +static char * top; +static char * end; + +static int +next (void) +{ + size_t bytes; + int res; + + if (top == end) + { + if (end < page + sizeof page) + return EOF; + + bytes = fread (page, 1, sizeof page, input); + if (bytes == 0) + return EOF; + + top = page; + end = page + bytes; + } + + res = *top++; + + if (res == '\n') + lineno++; + + return res; +} + +static const char * +parse (int force) +{ + int ch, sign, lit, vars, clauses; + + lineno = 1; + inputid = fileno (input); + +SKIP_COMMENTS: + ch = next (); + if (ch == 'c') + { + while ((ch = next ()) != EOF && ch != '\n') + ; + goto SKIP_COMMENTS; + } + + if (isspace (ch)) + goto SKIP_COMMENTS; + + if (ch != 'p') +INVALID_HEADER: + return "missing or invalid 'p cnf <variables> <clauses>' header"; + + if (!isspace (next ())) + goto INVALID_HEADER; + + while (isspace (ch = next ())) + ; + + if (ch != 'c' || next () != 'n' || next () != 'f' || !isspace (next ())) + goto INVALID_HEADER; + + while (isspace (ch = next ())) + ; + + if (!isdigit (ch)) + goto INVALID_HEADER; + + vars = ch - '0'; + while (isdigit (ch = next ())) + vars = 10 * vars + (ch - '0'); + + if (!isspace (ch)) + goto INVALID_HEADER; + + while (isspace (ch = next ())) + ; + + if (!isdigit (ch)) + goto INVALID_HEADER; + + clauses = ch - '0'; + while (isdigit (ch = next ())) + clauses = 10 * clauses + (ch - '0'); + + if (!isspace (ch) && ch != '\n' ) + goto INVALID_HEADER; + + if (verbose) + { + fprintf (output, "c parsed header 'p cnf %d %d'\n", vars, clauses); + fflush (output); + } + + picosat_adjust (vars); + + if (incremental_rup_file) + picosat_set_incremental_rup_file (incremental_rup_file, vars, clauses); + + lit = 0; +READ_LITERAL: + ch = next (); + + if (ch == 'c') + { + while ((ch = next ()) != EOF && ch != '\n') + ; + goto READ_LITERAL; + } + + if (ch == EOF) + { + if (lit) + return "trailing 0 missing"; + + if (clauses && !force) + return "clause missing"; + + return 0; + } + + if (isspace (ch)) + goto READ_LITERAL; + + sign = 1; + if (ch == '-') + { + sign = -1; + ch = next (); + } + + if (!isdigit (ch)) + return "expected number"; + + lit = ch - '0'; + while (isdigit (ch = next ())) + lit = 10 * lit + (ch - '0'); + + if (!clauses && !force) + return "too many clauses"; + + if (lit) + { + if (lit > vars && !force) + return "maximal variable index exceeded"; + + lit *= sign; + } + else + clauses--; + + picosat_add (lit); + + goto READ_LITERAL; +} + +static void +bflush (void) +{ + *bhead = 0; + fputs (buffer, output); + fputc ('\n', output); + bhead = buffer; +} + +static void +printi (int i) +{ + char *next; + int l; + +REENTER: + if (bhead == buffer) + *bhead++ = 'v'; + + l = sprintf (bhead, " %d", i); + next = bhead + l; + + if (next >= eob) + { + bflush (); + goto REENTER; + } + else + bhead = next; +} + +static void +printa (void) +{ + int max_idx = picosat_variables (), i, lit; + + assert (bhead == buffer); + + for (i = 1; i <= max_idx; i++) + { + lit = (picosat_deref (i) > 0) ? i : -i; + printi (lit); + } + + printi (0); + if (bhead > buffer) + bflush (); +} + +static int +has_suffix (const char *str, const char *suffix) +{ + const char *tmp = strstr (str, suffix); + if (!tmp) + return 0; + + return str + strlen (str) - strlen (suffix) == tmp; +} + +static void +write_core_variables (FILE * file) +{ + int i, max_idx = picosat_variables (), count = 0; + for (i = 1; i <= max_idx; i++) + if (picosat_corelit (i)) + { + fprintf (file, "%d\n", i); + count++; + } + + if (verbose) + fprintf (output, "c found and wrote %d core variables\n", count); +} + +static int +next_assumption (int start) +{ + char * arg, c; + int res; + res = start + 1; + while (res < sargc) + { + arg = sargv[res++]; + if (!strcmp (arg, "-a")) + { + assert (res < sargc); + break; + } + + if (arg[0] == '-') { + c = arg[1]; + if (c == 'l' || c == 'i' || c == 's' || c == 'o' || c == 't' || + c == 'T' || c == 'r' || c == 'R' || c == 'c' || c == 'V' || + c == 'U' || c == 'A') res++; + } + } + if (res >= sargc) res = 0; + return res; +} + +static void +write_failed_assumptions (FILE * file) +{ + int i, lit, count = 0; +#ifndef NDEBUG + int max_idx = picosat_variables (); +#endif + i = 0; + while ((i = next_assumption (i))) { + lit = atoi (sargv[i]); + if (!picosat_failed_assumption (lit)) continue; + fprintf (file, "%d\n", lit); + count++; + } + if (verbose) + fprintf (output, "c found and wrote %d failed assumptions\n", count); +#ifndef NDEBUG + for (i = 1; i <= max_idx; i++) + if (picosat_failed_assumption (i)) + count--; +#endif + assert (!count); +} + +static void +write_to_file (const char *name, const char *type, void (*writer) (FILE *)) +{ + int pclose_file, zipped = has_suffix (name, ".gz"); + FILE *file; + char *cmd; + + if (zipped) + { + cmd = malloc (strlen (GZIP) + strlen (name)); + sprintf (cmd, GZIP, name); + file = popen (cmd, "w"); + free (cmd); + pclose_file = 1; + } + else + { + file = fopen (name, "w"); + pclose_file = 0; + } + + if (file) + { + if (verbose) + fprintf (output, + "c\nc writing %s%s to '%s'\n", + zipped ? "gzipped " : "", type, name); + + writer (file); + + if (pclose_file) + pclose (file); + else + fclose (file); + } + else + fprintf (output, "*** picosat: can not write to '%s'\n", name); +} + +#define USAGE \ +"usage: picosat [ <option> ... ] [ <input> ]\n" \ +"\n" \ +"where <option> is one of the following\n" \ +"\n" \ +" -h print this command line option summary and exit\n" \ +" --version print version and exit\n" \ +" --config print build configuration and exit\n" \ +"\n" \ +" -v enable verbose output\n" \ +" -f ignore invalid header\n" \ +" -n do not print satisfying assignment\n" \ +" -p print formula in DIMACS format and exit\n" \ +" -a <lit> start with an assumption\n" \ +" -l <limit> set decision limit (no limit per default)\n" \ +" -P <limit> set propagation limit (no limit per default)\n" \ +" -i [0-3] [0-3]=[FALSE,TRUE,JWH,RAND] initial phase (default 2=JWH)\n" \ +" -s <seed> set random number generator seed (default 0)\n" \ +" -o <output> set output file (<stdout> per default)\n" \ +" -t <trace> generate compact proof trace file\n" \ +" -T <trace> generate extended proof trace file\n" \ +" -r <trace> generate reverse unit propagation proof file\n" \ +" -R <trace> generate reverse unit propagation proof file incrementally\n" \ +" -c <core> generate clausal core file in DIMACS format\n" \ +" -V <core> generate file listing core variables\n" \ +" -U <core> generate file listing used variables\n" \ +" -A <core> generate file listing failed assumptions\n" \ +"\n" \ +"and <input> is an optional input file in DIMACS format.\n" + +int +picosat_main (int argc, char **argv) +{ + int res, done, err, print_satisfying_assignment, force, print_formula; + const char *compact_trace_name, *extended_trace_name, * rup_trace_name; + const char * clausal_core_name, * variable_core_name; + int assumption, assumptions, defaultphase; + const char *input_name, *output_name; + const char * failed_assumptions_name; + int close_input, pclose_input; + long long propagation_limit; + int i, decision_limit; + double start_time; + unsigned seed; + FILE *file; + int trace; + + start_time = picosat_time_stamp (); + + sargc = argc; + sargv = argv; + + clausal_core_name = 0; + variable_core_name = 0; + failed_assumptions_name = 0; + output_name = 0; + compact_trace_name = 0; + extended_trace_name = 0; + rup_trace_name = 0; + incremental_rup_file = 0; + close_input = 0; + pclose_input = 0; + input_name = "<stdin>"; + input = stdin; + output = stdout; + verbose = 0; + done = err = 0; + decision_limit = -1; + propagation_limit = -1; + defaultphase = 2; + assumptions = 0; + force = 0; + trace = 0; + seed = 0; + + top = end = page + sizeof page; + + print_satisfying_assignment = 1; + print_formula = 0; + + for (i = 1; !done && !err && i < argc; i++) + { + if (!strcmp (argv[i], "-h")) + { + fputs (USAGE, output); + done = 1; + } + else if (!strcmp (argv[i], "--version")) + { + fprintf (output, "%s\n", picosat_version ()); + done = 1; + } + else if (!strcmp (argv[i], "--config")) + { + fprintf (output, "%s\n", picosat_config ()); + done = 1; + } + else if (!strcmp (argv[i], "-v")) + { + verbose++; + } + else if (!strcmp (argv[i], "-f")) + { + force = 1; + } + else if (!strcmp (argv[i], "-n")) + { + print_satisfying_assignment = 0; + } + else if (!strcmp (argv[i], "-p")) + { + print_formula = 1; + } + else if (!strcmp (argv[i], "-l")) + { + if (++i == argc) + { + fprintf (output, "*** picosat: argument to '-l' missing\n"); + err = 1; + } + else + decision_limit = atoi (argv[i]); + } + else if (!strcmp (argv[i], "-P")) + { + if (++i == argc) + { + fprintf (output, "*** picosat: argument to '-P' missing\n"); + err = 1; + } + else + propagation_limit = atoll (argv[i]); + } + else if (!strcmp (argv[i], "-i")) + { + if (++i == argc) + { + fprintf (output, "*** picosat: argument to '-i' missing\n"); + err = 1; + } + else if (!argv[i][1] && ('0' <= argv[i][0] && argv[i][0] <= '3')) + { + defaultphase = argv[i][0] - '0'; + } + else + { + fprintf (output, "*** picosat: invalid argument to '-i'\n"); + err = 1; + } + } + else if (!strcmp (argv[i], "-a")) + { + if (++i == argc) + { + fprintf (output, "*** picosat: argument to '-a' missing\n"); + err = 1; + } + else if (!atoi (argv[i])) + { + fprintf (output, "*** picosat: argument to '-a' zero\n"); + err = 1; + } + else + { + /* Handle assumptions further down + */ + assumptions++; + } + } + else if (!strcmp (argv[i], "-s")) + { + if (++i == argc) + { + fprintf (output, "*** picosat: argument to '-s' missing\n"); + err = 1; + } + else + seed = atoi (argv[i]); + } + else if (!strcmp (argv[i], "-o")) + { + if (output_name) + { + fprintf (output, + "*** picosat: " + "multiple output files '%s' and '%s'\n", + output_name, argv[i]); + err = 1; + } + else if (++i == argc) + { + fprintf (output, "*** picosat: argument ot '-o' missing\n"); + err = 1; + } + else if (!(file = fopen (argv[i], "w"))) + { + fprintf (output, + "*** picosat: " + "can not write output file '%s'\n", argv[i]); + err = 1; + } + else + { + output_name = argv[i]; + output = file; + } + } + else if (!strcmp (argv[i], "-t")) + { + if (compact_trace_name) + { + fprintf (output, + "*** picosat: " + "multiple compact trace files '%s' and '%s'\n", + compact_trace_name, argv[i]); + err = 1; + } + else if (++i == argc) + { + fprintf (output, "*** picosat: argument ot '-t' missing\n"); + err = 1; + } + else + { + compact_trace_name = argv[i]; + trace = 1; + } + } + else if (!strcmp (argv[i], "-T")) + { + if (extended_trace_name) + { + fprintf (output, + "*** picosat: " + "multiple extended trace files '%s' and '%s'\n", + extended_trace_name, argv[i]); + err = 1; + } + else if (++i == argc) + { + fprintf (output, "*** picosat: argument ot '-T' missing\n"); + err = 1; + } + else + { + extended_trace_name = argv[i]; + trace = 1; + } + } + else if (!strcmp (argv[i], "-r")) + { + if (rup_trace_name) + { + fprintf (output, + "*** picosat: " + "multiple RUP trace files '%s' and '%s'\n", + rup_trace_name, argv[i]); + err = 1; + } + else if (++i == argc) + { + fprintf (output, "*** picosat: argument ot '-r' missing\n"); + err = 1; + } + else + { + rup_trace_name = argv[i]; + trace = 1; + } + } + else if (!strcmp (argv[i], "-R")) + { + if (rup_trace_name) + { + fprintf (output, + "*** picosat: " + "multiple RUP trace files '%s' and '%s'\n", + rup_trace_name, argv[i]); + err = 1; + } + else if (++i == argc) + { + fprintf (output, "*** picosat: argument ot '-R' missing\n"); + err = 1; + } + else if (!(file = fopen (argv[i], "w"))) + { + fprintf (output, + "*** picosat: can not write to '%s'\n", argv[i]); + err = 1; + } + else + { + rup_trace_name = argv[i]; + incremental_rup_file = file; + } + } + else if (!strcmp (argv[i], "-c")) + { + if (clausal_core_name) + { + fprintf (output, + "*** picosat: " + "multiple clausal core files '%s' and '%s'\n", + clausal_core_name, argv[i]); + err = 1; + } + else if (++i == argc) + { + fprintf (output, "*** picosat: argument ot '-c' missing\n"); + err = 1; + } + else + { + clausal_core_name = argv[i]; + trace = 1; + } + } + else if (!strcmp (argv[i], "-V")) + { + if (variable_core_name) + { + fprintf (output, + "*** picosat: " + "multiple variable core files '%s' and '%s'\n", + variable_core_name, argv[i]); + err = 1; + } + else if (++i == argc) + { + fprintf (output, "*** picosat: argument ot '-V' missing\n"); + err = 1; + } + else + { + variable_core_name = argv[i]; + trace = 1; + } + } + else if (!strcmp (argv[i], "-A")) + { + if (failed_assumptions_name) + { + fprintf (output, + "*** picosat: " + "multiple failed assumptions files '%s' and '%s'\n", + failed_assumptions_name, argv[i]); + err = 1; + } + else if (++i == argc) + { + fprintf (output, "*** picosat: argument ot '-A' missing\n"); + err = 1; + } + else + failed_assumptions_name = argv[i]; + } + else if (argv[i][0] == '-') + { + fprintf (output, + "*** picosat: " + "unknown command line option '%s' (try '-h')\n", argv[i]); + err = 1; + } + else if (close_input || pclose_input) + { + fprintf (output, + "*** picosat: " + "multiple input files '%s' and '%s'\n", + input_name, argv[i]); + err = 1; + } + else if (has_suffix (argv[i], ".gz")) + { + char *cmd = malloc (strlen (GUNZIP) + strlen (argv[i])); + sprintf (cmd, GUNZIP, argv[i]); + if ((file = popen (cmd, "r"))) + { + input_name = argv[i]; + pclose_input = 1; + input = file; + } + else + { + fprintf (output, + "*** picosat: " + "can not read compressed input file '%s'\n", argv[i]); + err = 1; + } + free (cmd); + } + else if (!(file = fopen (argv[i], "r"))) /* TODO .gz ? */ + { + fprintf (output, + "*** picosat: can not read input file '%s'\n", argv[i]); + err = 1; + } + else + { + input_name = argv[i]; + close_input = 1; + input = file; + } + } + + res = PICOSAT_UNKNOWN; + + if (!done && !err) + { + const char *err_msg; + + if (verbose) + { + fprintf (output, + "c PicoSAT SAT Solver Version %s\n", + picosat_version ()); + + fprintf (output, "c %s\n", picosat_copyright ()); + fprintf (output, "c %s\n", picosat_config ()); + } + + picosat_init (); + picosat_enter (); + + if (output_name) + picosat_set_output (output); + + picosat_set_verbosity (verbose); + + if (verbose) fputs ("c\n", output); + + if (trace) + { + if (verbose) + fprintf (output, "c tracing proof\n"); + picosat_enable_trace_generation (); + } + + if (defaultphase) + { + if (verbose) + fprintf (output, "c using %d as default phase\n", defaultphase); + + picosat_set_global_default_phase (defaultphase); + } + + if (propagation_limit >= 0) + { + if (verbose) + fprintf (output, "c propagation limit of %lld propagations\n", + propagation_limit); + picosat_set_propagation_limit ( + (unsigned long long) propagation_limit); + } + + if (verbose) + fprintf (output, "c\nc parsing %s\n", input_name); + + if ((err_msg = parse (force))) + { + fprintf (output, "%s:%d: %s\n", input_name, lineno, err_msg); + err = 1; + } + else + { + if (assumptions) + { + i = 0; + while ((i = next_assumption (i))) + { + assert (i < argc); + assumption = atoi (argv[i]); + assert (assumption); + + picosat_assume (assumption); + + if (verbose) + fprintf (output, "c assumption %d\n", assumption); + } + } + + if (print_formula) + { + picosat_print (output); + } + else + { + if (verbose) + fprintf (output, + "c initialized %u variables\n" + "c found %u non trivial clauses\n", + picosat_variables (), + picosat_added_original_clauses ()); + + picosat_set_seed (seed); + if (verbose) + fprintf (output, + "c\nc random number generator seed %u\n", + seed); + + res = picosat_sat (decision_limit); + + if (res == PICOSAT_UNSATISFIABLE) + { + fputs ("s UNSATISFIABLE\n", output); + + if (compact_trace_name) + write_to_file (compact_trace_name, + "compact trace", + picosat_write_compact_trace); + + if (extended_trace_name) + write_to_file (extended_trace_name, + "extended trace", + picosat_write_extended_trace); + + if (!incremental_rup_file && rup_trace_name) + write_to_file (rup_trace_name, + "rup trace", + picosat_write_rup_trace); + + if (clausal_core_name) + write_to_file (clausal_core_name, + "clausal core", + picosat_write_clausal_core); + + if (variable_core_name) + write_to_file (variable_core_name, + "variable core", write_core_variables); + + if (failed_assumptions_name) + write_to_file (failed_assumptions_name, + "failed assumptions", + write_failed_assumptions); + } + else if (res == PICOSAT_SATISFIABLE) + { + fputs ("s SATISFIABLE\n", output); + + if (print_satisfying_assignment) + printa (); + } + else + fputs ("s UNKNOWN\n", output); + } + } + + if (!err && verbose) + { + fputs ("c\n", output); + picosat_stats (); + fprintf (output, + "c %.1f seconds total run time\n", + picosat_time_stamp () - start_time); + } + + picosat_leave (); + picosat_reset (); + } + + if (incremental_rup_file) + fclose (incremental_rup_file); + + if (close_input) + fclose (input); + + if (pclose_input) + pclose (input); + + if (output_name) + fclose (output); + + return res; +} diff --git a/src/prop/bvpicosat/config.h b/src/prop/bvpicosat/config.h new file mode 100644 index 000000000..aa6888822 --- /dev/null +++ b/src/prop/bvpicosat/config.h @@ -0,0 +1,3 @@ +#define PICOSAT_CC "gcc" +#define PICOSAT_CFLAGS "-DSTATS -DTRACE -Wall -Wextra -DNDEBUG -O2" +#define PICOSAT_VERSION "936" diff --git a/src/prop/bvpicosat/configure b/src/prop/bvpicosat/configure new file mode 100755 index 000000000..23cf0efb4 --- /dev/null +++ b/src/prop/bvpicosat/configure @@ -0,0 +1,151 @@ +#!/bin/sh + +satcompetition=no + +log=no +debug=no +optimize=no +stats=undefined +trace=undefined +static=yes +shared=no +thirtytwobit=no +static=no + +while [ $# -gt 0 ] +do + case $1 in + -l|--log) debug=yes; log=yes;; + -g|--debug) debug=yes; optimize=no;; + -s|--stats) stats=yes;; + -t|--trace) trace=yes;; + --no-stats) stats=no;; + --no-trace) trace=no;; + -32|--32|-m32) thirtytwobit=yes;; + -static|--static) static=yes;; + -O) debug=no; optimize=yes;; + *) cat <<EOF +usage: ./configure [<option> ...] + +where <option> is one of the following: + + -g|--debug includ debugging code and symbols + -l|--log add low level logging code + -s|--stats include and enable more expensive stats counters + -t|--trace compile with trace generation support (more memory) + --no-stats disable expensive stats + --no-trace enable trace generation (less memory) + -32|--32|-m32 compile for 32 bit machine even on 64 bit host + -static|--static only produce static library + -shared|--shared produce shared library as well + -O optimize a lot and disable trace generation +EOF +exit 1 +;; + esac +shift +done + +echo "version ... `cat VERSION`" + +if [ $satcompetition = yes ] +then + debug=no + optimize=yes + stats=no + trace=no + thirtytwobit=yes + static=yes + shared=no +fi + +echo "debug ... $debug" +echo "optimize ... $optimize" +echo "log ... $log" + +if [ $stats = undefined ] +then + if [ $optimize = yes ] + then + stats=no + else + stats=yes + fi +fi +echo "stats ... $stats" + +if [ $trace = undefined ] +then + if [ $optimize = yes ] + then + trace=no + else + trace=yes + fi +fi +echo "trace ... $trace" + +echo "static ... $static" + +echo "shared ... $shared" + +[ "X$CC" = X ] && CC=gcc + +if [ X"$CFLAGS" = X ] +then + case X"$CC" in + *wine*|*mingw*) CFLAGS="-DNGETRUSAGE -DNALLSIGNALS";; + *);; + esac + [ $log = yes ] && CFLAGS="$CFLAGS -DLOGGING" + [ $stats = yes ] && CFLAGS="$CFLAGS -DSTATS" + [ $trace = yes ] && CFLAGS="$CFLAGS -DTRACE" + [ $static = yes ] && CFLAGS="$CFLAGS -static" + case X"$CC" in + X*gcc*) + CFLAGS="$CFLAGS -Wall -Wextra" + [ $thirtytwobit = yes ] && CFLAGS="$CFLAGS -m32" + if [ $debug = yes ] + then + CFLAGS="$CFLAGS -g3 -ggdb" + else + CFLAGS="$CFLAGS -DNDEBUG" + if [ $optimize = yes ] + then + CFLAGS="$CFLAGS -O3 -fomit-frame-pointer -finline-limit=1000000" + else + CFLAGS="$CFLAGS -O2" + fi + fi + ;; + *) + if [ $debug = yes ] + then + CFLAGS="$CFLAGS -g" + else + CFLAGS="$CFLAGS -O" + fi + ;; + esac +fi + +TARGETS="picosat picomus libpicosat.a" +if [ $shared = yes ] +then + TARGETS="$TARGETS libpicosat.so" + CFLAGS="$CFLAGS -fPIC" +fi +echo "targets ... $TARGETS" + +echo "cc ... $CC" + +echo "cflags ... $CFLAGS" + +echo -n "makefile ..." +rm -f makefile +sed \ + -e "s,@CC@,$CC," \ + -e "s,@CFLAGS@,$CFLAGS," \ + -e "s,@TARGETS@,$TARGETS," \ +makefile.in > makefile +echo " done" diff --git a/src/prop/bvpicosat/main.c b/src/prop/bvpicosat/main.c new file mode 100644 index 000000000..cb82580fa --- /dev/null +++ b/src/prop/bvpicosat/main.c @@ -0,0 +1,90 @@ +#include <signal.h> +#include <stdlib.h> +#include <string.h> + +#include "picosat.h" + +int picosat_main (int, char **); + +static int catched; + +static void (*sig_int_handler); +static void (*sig_segv_handler); +static void (*sig_abrt_handler); +static void (*sig_term_handler); +#ifndef NALLSIGNALS +static void (*sig_kill_handler); +static void (*sig_xcpu_handler); +static void (*sig_xfsz_handler); +#endif + +static void +resetsighandlers (void) +{ + (void) signal (SIGINT, sig_int_handler); + (void) signal (SIGSEGV, sig_segv_handler); + (void) signal (SIGABRT, sig_abrt_handler); + (void) signal (SIGTERM, sig_term_handler); +#ifndef NALLSIGNALS + (void) signal (SIGKILL, sig_kill_handler); + (void) signal (SIGXCPU, sig_xcpu_handler); + (void) signal (SIGXFSZ, sig_xfsz_handler); +#endif +} + +static void +message (int sig) +{ + picosat_message (1, ""); + picosat_message (1, "*** CAUGHT SIGNAL %d ***", sig); + picosat_message (1, ""); +} + +static void +catch (int sig) +{ + if (!catched) + { + message (sig); + catched = 1; + picosat_stats (); + message (sig); + } + + resetsighandlers (); + raise (sig); +} + +static void +setsighandlers (void) +{ + sig_int_handler = signal (SIGINT, catch); + sig_segv_handler = signal (SIGSEGV, catch); + sig_abrt_handler = signal (SIGABRT, catch); + sig_term_handler = signal (SIGTERM, catch); +#ifndef NALLSIGNALS + sig_kill_handler = signal (SIGKILL, catch); + sig_xcpu_handler = signal (SIGXCPU, catch); + sig_xfsz_handler = signal (SIGXFSZ, catch); +#endif +} + +int +main (int argc, char **argv) +{ + int res, verbose; + + for (verbose = argc - 1; verbose; verbose--) + if (!strcmp (argv[verbose], "-v")) + break; + + if (verbose) + setsighandlers (); + + res = picosat_main (argc, argv); + + if (verbose) + resetsighandlers (); + + return res; +} diff --git a/src/prop/bvpicosat/makefile b/src/prop/bvpicosat/makefile new file mode 100644 index 000000000..f6fd2f099 --- /dev/null +++ b/src/prop/bvpicosat/makefile @@ -0,0 +1,43 @@ +CC=gcc +CFLAGS= -DSTATS -DTRACE -Wall -Wextra -DNDEBUG -O2 + +all: picosat picomus libpicosat.a + +clean: + rm -f picosat *.exe *.s *.o *.a *.so + rm -f makefile config.h + rm -f gmon.out *~ + +picosat: libpicosat.a app.o main.o + $(CC) $(CFLAGS) -o $@ main.o app.o -L. -lpicosat + +picomus: libpicosat.a picomus.o + $(CC) $(CFLAGS) -o $@ picomus.o -L. -lpicosat + +app.o: app.c picosat.h makefile + $(CC) $(CFLAGS) -c $< + +picomus.o: picomus.c picosat.h makefile + $(CC) $(CFLAGS) -c $< + +main.o: main.c picosat.h makefile + $(CC) $(CFLAGS) -c $< + +picosat.o: picosat.c picosat.h makefile + $(CC) $(CFLAGS) -c $< + +version.o: version.c config.h makefile + $(CC) $(CFLAGS) -c $< + +config.h: makefile VERSION mkconfig # and actually picosat.c + rm -f $@; ./mkconfig > $@ + +libpicosat.a: picosat.o version.o + ar rc $@ picosat.o version.o + ranlib $@ + +SONAME=-Xlinker -soname -Xlinker libpicosat.so +libpicosat.so: picosat.o version.o + $(CC) $(CFLAGS) -shared -o $@ picosat.o version.o $(SONAME) + +.PHONY: all clean diff --git a/src/prop/bvpicosat/makefile.in b/src/prop/bvpicosat/makefile.in new file mode 100644 index 000000000..8c8f22299 --- /dev/null +++ b/src/prop/bvpicosat/makefile.in @@ -0,0 +1,43 @@ +CC=@CC@ +CFLAGS=@CFLAGS@ + +all: @TARGETS@ + +clean: + rm -f picosat *.exe *.s *.o *.a *.so + rm -f makefile config.h + rm -f gmon.out *~ + +picosat: libpicosat.a app.o main.o + $(CC) $(CFLAGS) -o $@ main.o app.o -L. -lpicosat + +picomus: libpicosat.a picomus.o + $(CC) $(CFLAGS) -o $@ picomus.o -L. -lpicosat + +app.o: app.c picosat.h makefile + $(CC) $(CFLAGS) -c $< + +picomus.o: picomus.c picosat.h makefile + $(CC) $(CFLAGS) -c $< + +main.o: main.c picosat.h makefile + $(CC) $(CFLAGS) -c $< + +picosat.o: picosat.c picosat.h makefile + $(CC) $(CFLAGS) -c $< + +version.o: version.c config.h makefile + $(CC) $(CFLAGS) -c $< + +config.h: makefile VERSION mkconfig # and actually picosat.c + rm -f $@; ./mkconfig > $@ + +libpicosat.a: picosat.o version.o + ar rc $@ picosat.o version.o + ranlib $@ + +SONAME=-Xlinker -soname -Xlinker libpicosat.so +libpicosat.so: picosat.o version.o + $(CC) $(CFLAGS) -shared -o $@ picosat.o version.o $(SONAME) + +.PHONY: all clean diff --git a/src/prop/bvpicosat/mkconfig b/src/prop/bvpicosat/mkconfig new file mode 100755 index 000000000..d0c8fa835 --- /dev/null +++ b/src/prop/bvpicosat/mkconfig @@ -0,0 +1,35 @@ +#!/bin/sh + +die () { + echo "*** mkconfig: $*" 1>&2 + exit 1 +} + +[ -f makefile ] || die "can not find 'makefile'" + +sed \ + -e '/^C[A-Z]*=/!d' \ + -e 's,^,#define PICOSAT_,' \ + -e 's,= *, ",' \ + -e 's,$,",' \ + makefile + +id="" +if [ -d .git -a -f .git/HEAD ] +then + head="`awk 'NF == 1' .git/HEAD`" + if [ x"$head" = x ] + then + head="`awk '{print $2}' .git/HEAD`" + if [ ! x"$head" = x -a -f ".git/$head" ] + then + id=" `cat .git/$head`" + fi + else + id=" $head" + fi +fi + +echo "#define PICOSAT_VERSION \"`cat VERSION`$id\"" + +exit 0 diff --git a/src/prop/bvpicosat/picomus.c b/src/prop/bvpicosat/picomus.c new file mode 100644 index 000000000..bf98dc644 --- /dev/null +++ b/src/prop/bvpicosat/picomus.c @@ -0,0 +1,340 @@ +/**************************************************************************** +Copyright (c) 2010, Armin Biere, Johannes Kepler University. + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to +deal in the Software without restriction, including without limitation the +rights to use, copy, modify, merge, publish, distribute, sublicense, and/or +sell copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS +IN THE SOFTWARE. +****************************************************************************/ + +#include "picosat.h" + +#include <stdio.h> +#include <assert.h> +#include <string.h> +#include <stdarg.h> +#include <ctype.h> + +#define MAXNONREDROUNDS 3 +#define MINCOREROUNDS 5 +#define MAXCOREROUNDS 100 + +typedef struct Cls { int lit, red, * lits; } Cls; + +static int verbose; +static int fclose_input, pclose_input, close_output; +static FILE * input_file, * output_file; +static const char * input_name, * output_name; +static int lineno = 1; +static int nvars, nclauses; +static Cls * clauses; +static int * lits, nlits, szlits; +static double start; +static int reductions; + +static int next (void) { + int res = fgetc (input_file); + if (res == '\n') lineno++; + return res; +} + +static void msg (const char * fmt, ...) { + va_list ap; + if (!verbose) return; + fputs ("c [picomus] ", stderr); + va_start (ap, fmt); + vfprintf (stderr, fmt, ap); + va_end (ap); + fputc ('\n', stderr); + fflush (stderr); +} + +static const char * parse (void) { + int ch, n, lit, sign, i; + Cls * c; +HEADER: + ch = next (); + if (ch == 'c') { + while ((ch = next ()) != '\n') + if (ch == EOF) return "EOF after 'c'"; + goto HEADER; + } + if (ch == '\r') goto HEADER; + if (ch != 'p') return "expected 'c' or 'p'"; + if (fscanf (input_file, " cnf %d %d", &nvars, &nclauses) != 2) + return "invalid header"; + msg ("p cnf %d %d", nvars, nclauses); + clauses = calloc (nclauses, sizeof *clauses); + lit = n = 0; +LIT: + ch = next (); + if (ch == ' ' || ch == '\n' || ch == '\t' || ch == '\r') goto LIT; + if (ch == 'c') { + while ((ch = next ()) != '\n') + if (ch == EOF) return "EOF after 'c'"; + goto LIT; + } + if (ch == EOF) { + if (lit) return "zero missing"; + if (n < nclauses) return "clauses missing"; + return 0; + } + if (n == nclauses) return "too many clauses"; + if (ch == '-') { + sign = -1; + ch = next (); + if (!isdigit (ch)) return "expected digit after '-'"; + } else sign = 1; + if (!isdigit (ch)) return "expected digit"; + lit = ch - '0'; + while (isdigit (ch = next ())) + lit = 10 * lit + (ch - '0'); + if (lit > nvars) return "maximum variable index exceeded"; + if (lit) { + lit *= sign; + if (nlits == szlits) { + szlits = szlits ? 2 * szlits : 1; + lits = realloc (lits, szlits * sizeof *lits); + } + lits[nlits++] = lit; + } else { + c = clauses + n++; + c->lits = malloc ((nlits + 1) * sizeof *c->lits); + for (i = 0; i < nlits; i++) + c->lits[i] = lits[i]; + c->lits[i] = 0; + nlits = 0; + } + goto LIT; +} + +static void die (const char * fmt, ...) { + va_list ap; + fputs ("*** picomus: ", stderr); + va_start (ap, fmt); + vfprintf (stderr, fmt, ap); + va_end (ap); + fputc ('\n', stderr); + fflush (stderr); + exit (1); +} + +static double percent (double a, double b) { return b?100.0*a/b:0.0; } + +static void callback (void * dummy, const int * mus) { + int remaining; + const int * p; + (void) dummy; + if (!verbose) return; + remaining = 0; + for (p = mus; *p; p++) remaining++; + assert (remaining <= nclauses); + reductions++; + msg ("reduction %d to %d out of %d (%.0f%%) after %.1f sec", + reductions, + remaining, nclauses, percent (remaining, nclauses), + picosat_time_stamp () - start); +} + +int main (int argc, char ** argv) { + int i, * p, n, oldn, red, nonred, tmp, res, round, printed, len; + const char * err; + const int * q; + char * cmd; + Cls * c; + start = picosat_time_stamp (); + for (i = 1; i < argc; i++) { + if (!strcmp (argv[i], "-h")) { + printf ( + "picomus [-v][-h][<input>[<output>]]\n" + "\n" + "This tool is a SAT solver that uses the PicoSAT library to\n" + "generate a 'minimal unsatisfiable core' also known as 'minimal\n" + "unsatisfiable set' (MUS) of a CNF in DIMACS format.\n" + "\n" + "Both file argumetns can be \"-\" and then denote <stdin> resp.\n" + "<stdout>. If no input file is given <stdin> is used. If no\n" + "output file is specified the MUS is only computed, but not\n" + "printed.\n" + "\n" + "Otherwise the output conforms to the standard SAT solver\n" + "format used at SAT competitions.\n" + "\n" +#ifndef TRACE + "WARNING: PicosSAT is compiled without trace support.\n" + "\n" + "This typically slows down this MUS extractor, since\n" + "it only relies on clause selector variables and\n" + "can not make use of core extraction. To enable\n" + "trace generation use './configure --trace' or\n" + "'./configure -O --trace' when building PicoSAT.\n" +#else + "Since trace generation code is included, this binary\n" + "uses both core extraction and clause selector variables.\n" +#endif + ); + exit (0); + } else if (!strcmp (argv[i], "-v")) verbose++; + else if (output_name) die ("too many arguments"); + else if (!input_name) input_name = argv[i]; + else output_name = argv[i]; + } + if (input_name && strcmp (input_name, "-")) { + len = strlen (input_name); + if (len >= 3 && !strcmp (input_name + len - 3, ".gz")) { + cmd = malloc (len + 20); + sprintf (cmd, "gunzip -c %s 2>/dev/null", input_name); + input_file = popen (cmd, "r"); + pclose_input = 1; + free (cmd); + } else input_file = fopen (input_name, "r"), fclose_input = 1; + if (!input_file) die ("can not read '%s'", input_name); + } else input_file = stdin, input_name = "-"; + if ((err = parse ())) { + fprintf (stderr, "%s:%d: %s\n", input_name, lineno, err); + fflush (stderr); + exit (1); + } + if (fclose_input) fclose (input_file); + if (pclose_input) pclose (input_file); + picosat_init (); + picosat_set_prefix ("c [picosat] "); + picosat_set_output (stderr); + if (verbose > 1) picosat_set_verbosity (verbose - 1); + printed = 0; + if (picosat_enable_trace_generation ()) { + n = nclauses; + nonred = 0; + for (round = 1; round <= MAXCOREROUNDS; round++) { + if (verbose > 1) + msg ("starting core extraction round %d", round); + picosat_set_seed (round); + for (i = 0; i < nclauses; i++) { + c = clauses + i; + if (c->red) { + picosat_add (1); + picosat_add (-1); + } else { + for (p = c->lits; *p; p++) + picosat_add (*p); + } + tmp = picosat_add (0); + assert (tmp == i); + } + res = picosat_sat (-1); + if (res == 10) { assert (round == 1); goto SAT; } + assert (res == 20); + if (!printed) { + assert (round == 1); + printed = 1; + printf ("s UNSATISFIABLE\n"); + fflush (stdout); + } + for (i = 0; i < nclauses; i++) { + c = clauses + i; + if (c->red) { assert (!picosat_coreclause (i)); continue; } + if (picosat_coreclause (i)) continue; + c->red = 1; + } + oldn = n; + n = 0; + for (i = 0; i < nclauses; i++) if (!clauses[i].red) n++; + msg ("extracted core %d of size %d out of %d (%.0f%%) after %.1f sec", + round, n, nclauses, percent (n, nclauses), + picosat_time_stamp () - start); + assert (oldn >= n); + picosat_reset (); + picosat_init (); + picosat_set_prefix ("c [picosat] "); + picosat_set_output (stderr); + if (round >= MINCOREROUNDS) { + red = oldn - n; + if (red < 10 && (100*red + 99)/oldn < 2) { + nonred++; + if (nonred > MAXNONREDROUNDS) break; + } + } + if (round < MAXCOREROUNDS) picosat_enable_trace_generation (); + } + } + for (i = 0; i < nclauses; i++) { + c = clauses + i; + if (c->red) { + picosat_add (1); + picosat_add (-1); + tmp = picosat_add (0); + assert (tmp == i); + continue; + } + c->lit = nvars + i + 1; + picosat_add (-c->lit); + for (p = c->lits; *p; p++) + (void) picosat_add (*p); + tmp = picosat_add (0); + assert (tmp == i); + } + for (i = 0; i < nclauses; i++) { + c = clauses + i; + if (c->red) continue; + picosat_assume (c->lit); + } + res = picosat_sat (-1); + if (res == 20) { + if (!printed) printf ("s UNSATISFIABLE\n"), fflush (stdout); + for (i = 0; i < nclauses; i++) clauses[i].red = 1; + q = picosat_mus_assumptions (0, callback, 1); + while ((i = *q++)) { + i -= nvars + 1; + assert (0 <= i && i < nclauses); + clauses[i].red = 0; + } + } else { +SAT: + assert (res == 10); + printf ("s SATISFIABLE\n"); fflush (stdout); + for (i = 1; i <= nvars; i++) + printf ("v %d\n", ((picosat_deref (i) < 0) ? -1 : 1) * i); + printf ("v 0\n"); + } + if (verbose) picosat_stats (); + picosat_reset (); + n = 0; + for (i = 0; i < nclauses; i++) if (!clauses[i].red) n++; + red = nclauses - n; + msg ("found %d redundant clauses %.0f%%", red, percent (red, nclauses)); + if (output_name && strcmp (output_name, "-")) { + output_file = fopen (output_name, "w"); + if (!output_file) die ("can not write '%s'", output_name); + close_output = 1; + } else if (output_name && !strcmp (output_name, "-")) output_file = stdout; + if (output_file) { + fprintf (output_file, "p cnf %d %d\n", nvars, n); + for (i = 0; i < nclauses; i++) + if (!clauses[i].red) { + for (p = clauses[i].lits; *p; p++) fprintf (output_file, "%d ", *p); + fprintf (output_file, "0\n"); + } + if (close_output) fclose (output_file); + } + msg ("%s %d irredundant clauses %.0f%%", + output_file ? "printed" : "computed", n, percent (n, nclauses)); + for (i = 0; i < nclauses; i++) free (clauses[i].lits); + free (clauses); + free (lits); + msg ("%d reductions in %.1f seconds", + reductions, picosat_time_stamp () - start); + return res; +} diff --git a/src/prop/bvpicosat/picosat.c b/src/prop/bvpicosat/picosat.c new file mode 100644 index 000000000..490d235cc --- /dev/null +++ b/src/prop/bvpicosat/picosat.c @@ -0,0 +1,7731 @@ +/**************************************************************************** +Copyright (c) 2006 - 2010, Armin Biere, Johannes Kepler University. + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to +deal in the Software without restriction, including without limitation the +rights to use, copy, modify, merge, publish, distribute, sublicense, and/or +sell copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS +IN THE SOFTWARE. +****************************************************************************/ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <assert.h> +#include <limits.h> +#include <ctype.h> +#include <stdarg.h> + +#include "picosat.h" + +/* By default code for 'all different constraints' is disabled, since 'NADC' + * is defined. +#define NADC + */ + +/* By default we enable failed literals, since 'NFL' is undefined. + * + */ +#define NFL + +/* By default we 'detach satisfied (large) clauses', e.g. NDSC undefined. + * +#define NDSC + */ + +/* Do not use luby restart schedule instead of inner/outer. + * +#define NLUBY + */ + +// #define VISCORES /* keep this disabled */ + +#ifdef VISCORES +// #define WRITEGIF +#endif + +#ifdef VISCORES +#ifndef WRITEGIF +#include <unistd.h> /* for 'usleep' */ +#endif +#endif + +#define MINRESTART 100 /* minimum restart interval */ +#define MAXRESTART 1000000 /* maximum restart interval */ +#define RDECIDE 1000 /* interval of random decisions */ +#define FRESTART 110 /* restart increase factor in percent */ +#define FREDUCE 110 /* reduce increase factor in percent */ +#define FFLIPPED 10000 /* flipped reduce factor */ +#define FFLIPPEDPREC 10000000/* flipped reduce factor precision */ + +#ifndef TRACE +#define NO_BINARY_CLAUSES /* store binary clauses more compactly */ +#endif + +/* For debugging purposes you may want to define 'LOGGING', which actually + * can be enforced by using the '--log' option for the configure script. + */ +#ifdef LOGGING +#define LOG(code) do { code; } while (0) +#else +#define LOG(code) do { } while (0) +#endif +#define NOLOG(code) do { } while (0) /* log exception */ +#define ONLYLOG(code) do { code; } while (0) /* force logging */ + +#define FALSE ((Val)-1) +#define UNDEF ((Val)0) +#define TRUE ((Val)1) + +#define COMPACT_TRACECHECK_TRACE_FMT 0 +#define EXTENDED_TRACECHECK_TRACE_FMT 1 +#define RUP_TRACE_FMT 2 + +#define NEWN(p,n) do { (p) = new (sizeof (*(p)) * (n)); } while (0) +#define CLRN(p,n) do { memset ((p), 0, sizeof (*(p)) * (n)); } while (0) +#define CLR(p) CLRN(p,1) +#define DELETEN(p,n) \ + do { delete (p, sizeof (*(p)) * (n)); (p) = 0; } while (0) + +#define RESIZEN(p,old_num,new_num) \ + do { \ + size_t old_size = sizeof (*(p)) * (old_num); \ + size_t new_size = sizeof (*(p)) * (new_num); \ + (p) = resize ((p), old_size, new_size) ; \ + } while (0) + +#define ENLARGE(start,head,end) \ + do { \ + unsigned old_num = (unsigned)((end) - (start)); \ + size_t new_num = old_num ? (2 * old_num) : 1; \ + unsigned count = (head) - (start); \ + assert ((start) <= (start)); \ + RESIZEN((start),old_num,new_num); \ + (head) = (start) + count; \ + (end) = (start) + new_num; \ + } while (0) + +#define NOTLIT(l) (lits + (1 ^ ((l) - lits))) + +#define LIT2IDX(l) ((unsigned)((l) - lits) / 2) +#define LIT2IMPLS(l) (impls + (unsigned)((l) - lits)) +#define LIT2INT(l) (LIT2SGN(l) * LIT2IDX(l)) +#define LIT2SGN(l) (((unsigned)((l) - lits) & 1) ? -1 : 1) +#define LIT2VAR(l) (vars + LIT2IDX(l)) +#define LIT2HTPS(l) (htps + (unsigned)((l) - lits)) +#define LIT2JWH(l) (jwh + ((l) - lits)) + +#ifndef NDSC +#define LIT2DHTPS(l) (dhtps + (unsigned)((l) - lits)) +#endif + +#ifdef NO_BINARY_CLAUSES +typedef unsigned long Wrd; +#define ISLITREASON(cls) (1&(Wrd)cls) +#define LIT2REASON(lit) \ + (assert (lit->val==TRUE), ((Cls*)(1 + (2*(lit - lits))))) +#define REASON2LIT(cls) ((Lit*)(lits + ((Wrd)cls)/2)) +#endif + +#define ENDOFCLS(c) ((void*)((c)->lits + (c)->size)) + +#define SOC ((oclauses == ohead) ? lclauses : oclauses) +#define EOC lhead +#define NXC(p) (((p) + 1 == ohead) ? lclauses : (p) + 1) + +#define OIDX2IDX(idx) (2 * ((idx) + 1)) +#define LIDX2IDX(idx) (2 * (idx) + 1) + +#define ISLIDX(idx) ((idx)&1) + +#define IDX2OIDX(idx) (assert(!ISLIDX(idx)), (idx)/2 - 1) +#define IDX2LIDX(idx) (assert(ISLIDX(idx)), (idx)/2) + +#define EXPORTIDX(idx) \ + ((ISLIDX(idx) ? (IDX2LIDX (idx) + (ohead - oclauses)) : IDX2OIDX(idx)) + 1) + +#define IDX2CLS(i) \ + (assert(i), (ISLIDX(i) ? lclauses : oclauses)[(i)/2 - !ISLIDX(i)]) + +#define IDX2ZHN(i) (assert(i), (ISLIDX(i) ? zhains[(i)/2] : 0)) + +#define CLS2TRD(c) (((Trd*)(c)) - 1) +#define CLS2IDX(c) ((((Trd*)(c)) - 1)->idx) + +#define CLS2ACT(c) \ + ((Act*)((assert((c)->learned)),assert((c)->size>2),ENDOFCLS(c))) + +#define VAR2LIT(v) (lits + 2 * ((v) - vars)) +#define VAR2RNK(v) (rnks + ((v) - vars)) + +#define RNK2LIT(r) (lits + 2 * ((r) - rnks)) +#define RNK2VAR(r) (vars + ((r) - rnks)) + +#define BLK_FILL_BYTES 8 +#define SIZE_OF_BLK (sizeof (Blk) - BLK_FILL_BYTES) + +#define PTR2BLK(void_ptr) \ + ((void_ptr) ? (Blk*)(((char*)(void_ptr)) - SIZE_OF_BLK) : 0) + +#define AVERAGE(a,b) ((b) ? (((double)a) / (double)(b)) : 0.0) +#define PERCENT(a,b) (100.0 * AVERAGE(a,b)) + +#define ABORT(msg) \ + do { \ + fputs ("*** picosat: " msg "\n", stderr); \ + abort (); \ + } while (0) + +#define ABORTIF(cond,msg) \ + do { \ + if (!(cond)) break; \ + ABORT (msg); \ + } while (0) + +#define ZEROFLT (0x00000000u) +#define INFFLT (0xffffffffu) + +#define FLTCARRY (1u << 25) +#define FLTMSB (1u << 24) +#define FLTMAXMANTISSA (FLTMSB - 1) + +#define FLTMANTISSA(d) ((d) & FLTMAXMANTISSA) +#define FLTEXPONENT(d) ((int)((d) >> 24) - 128) + +#define FLTMINEXPONENT (-128) +#define FLTMAXEXPONENT (127) + +#define cmpswapflt(a,b) \ + do { \ + Flt tmp; \ + if (((a) < (b))) \ + { \ + tmp = (a); \ + (a) = (b); \ + (b) = tmp; \ + } \ + } while (0) + +#define unpackflt(u,m,e) \ + do { \ + (m) = FLTMANTISSA(u); \ + (e) = FLTEXPONENT(u); \ + (m) |= FLTMSB; \ + } while (0) + +#define INSERTION_SORT_LIMIT 10 + +#define internal_sorting_swap(T,p,q) \ +do { \ + T tmp = *(q); \ + *(q) = *(p); \ + *(p) = tmp; \ +} while (0) + +#define internal_sorting_cmpswap(T,cmp,p,q) \ +do { \ + if ((cmp) (*(p), *(q)) > 0) \ + internal_sorting_swap (T, p, q); \ +} while(0) + +#define internal_quicksort_partition(T,cmp,a,l,r) \ +do { \ + T pivot; \ + int j; \ + i = (l) - 1; /* result in 'i' */ \ + j = (r); \ + pivot = (a)[j]; \ + for (;;) \ + { \ + while ((cmp) ((a)[++i], pivot) < 0) \ + ; \ + while ((cmp) (pivot, (a)[--j]) < 0) \ + if (j == (l)) \ + break; \ + if (i >= j) \ + break; \ + internal_sorting_swap (T, (a) + i, (a) + j); \ + } \ + internal_sorting_swap (T, (a) + i, (a) + (r)); \ +} while(0) + +#define internal_quicksort(T,cmp,a,n) \ +do { \ + int l = 0, r = (n) - 1, m, ll, rr, i; \ + assert (ihead == indices); \ + if (r - l <= INSERTION_SORT_LIMIT) \ + break; \ + for (;;) \ + { \ + m = (l + r) / 2; \ + internal_sorting_swap (T, (a) + m, (a) + r - 1); \ + internal_sorting_cmpswap (T, cmp, (a) + l, (a) + r - 1); \ + internal_sorting_cmpswap (T, cmp, (a) + l, (a) + r); \ + internal_sorting_cmpswap (T, cmp, (a) + r - 1, (a) + r); \ + internal_quicksort_partition (T, cmp, (a), l + 1, r - 1); \ + if (i - l < r - i) \ + { \ + ll = i + 1; \ + rr = r; \ + r = i - 1; \ + } \ + else \ + { \ + ll = l; \ + rr = i - 1; \ + l = i + 1; \ + } \ + if (r - l > INSERTION_SORT_LIMIT) \ + { \ + assert (rr - ll > INSERTION_SORT_LIMIT); \ + if (ihead == eoi) \ + ENLARGE (indices, ihead, eoi); \ + *ihead++ = ll; \ + if (ihead == eoi) \ + ENLARGE (indices, ihead, eoi); \ + *ihead++ = rr; \ + } \ + else if (rr - ll > INSERTION_SORT_LIMIT) \ + { \ + l = ll; \ + r = rr; \ + } \ + else if (ihead > indices) \ + { \ + r = *--ihead; \ + l = *--ihead; \ + } \ + else \ + break; \ + } \ +} while (0) + +#define internal_insertion_sort(T,cmp,a,n) \ +do { \ + T pivot; \ + int l = 0, r = (n) - 1, i, j; \ + for (i = r; i > l; i--) \ + internal_sorting_cmpswap (T, cmp, (a) + i - 1, (a) + i); \ + for (i = l + 2; i <= r; i++) \ + { \ + j = i; \ + pivot = (a)[i]; \ + while ((cmp) (pivot, (a)[j - 1]) < 0) \ + { \ + (a)[j] = (a)[j - 1]; \ + j--; \ + } \ + (a)[j] = pivot; \ + } \ +} while (0) + +#ifdef NDEBUG +#define check_sorted(cmp,a,n) do { } while(0) +#else +#define check_sorted(cmp,a,n) \ +do { \ + int i; \ + for (i = 0; i < (n) - 1; i++) \ + assert ((cmp) ((a)[i], (a)[i + 1]) <= 0); \ +} while(0) +#endif + +#define sort(T,cmp,a,n) \ +do { \ + T * aa = (a); \ + int nn = (n); \ + internal_quicksort (T, cmp, aa, nn); \ + internal_insertion_sort (T, cmp, aa, nn); \ + assert (ihead == indices); \ + check_sorted (cmp, aa, nn); \ +} while (0) + +#define WRDSZ (sizeof (long) * 8) + +typedef unsigned Flt; /* 32 bit deterministic soft float */ +typedef Flt Act; /* clause and variable activity */ +typedef struct Blk Blk; /* allocated memory block */ +typedef struct Cls Cls; /* clause */ +typedef struct Lit Lit; /* literal */ +typedef struct Rnk Rnk; /* variable to score mapping */ +typedef signed char Val; /* TRUE, UNDEF, FALSE */ +typedef struct Var Var; /* variable */ +#ifdef TRACE +typedef struct Trd Trd; /* trace data for clauses */ +typedef struct Zhn Zhn; /* compressed chain (=zain) data */ +typedef unsigned char Znt; /* compressed antecedent data */ +#endif + +#ifdef NO_BINARY_CLAUSES +typedef struct Ltk Ltk; + +struct Ltk +{ + Lit ** start; + unsigned count : WRDSZ == 32 ? 27 : 32; + unsigned ldsize : WRDSZ == 32 ? 5 : 32; +}; +#endif + +struct Lit +{ + Val val; +}; + +struct Var +{ + unsigned mark : 1; + unsigned resolved : 1; + unsigned phase : 1; + unsigned assigned : 1; + unsigned used : 1; + unsigned failed : 1; +#ifdef TRACE + unsigned core : 1; +#endif + unsigned level : WRDSZ == 32 ? 24 : 32; + Cls *reason; +#ifndef NADC + Lit ** inado; + Lit ** ado; + Lit *** adotabpos; +#endif +}; + +struct Rnk +{ + Act score; + unsigned pos : 30; /* 0 iff not on heap */ + unsigned moreimportant : 1; + unsigned lessimportant : 1; +}; + +struct Cls +{ + unsigned size; + unsigned learned:1; + unsigned collect:1; + unsigned locked:1; + unsigned fixed:1; + unsigned used:1; +#ifndef NDEBUG + unsigned connected:1; +#endif +#ifdef TRACE + unsigned core:1; + unsigned collected:1; +#endif + Cls *next[2]; + Lit *lits[2]; +}; + +#ifdef TRACE +struct Zhn +{ + unsigned ref:31; + unsigned core:1; + Znt * liz; + Znt znt[0]; +}; + +struct Trd +{ + unsigned idx; + Cls cls[0]; +}; +#endif + +struct Blk +{ +#ifndef NDEBUG + union + { + size_t size; /* this is what we really use */ + void *as_two_ptrs[2]; /* 2 * sizeof (void*) alignment of data */ + } + header; +#endif + char data[BLK_FILL_BYTES]; +}; + +static enum State +{ + RESET = 0, + READY = 1, + SAT = 2, + UNSAT = 3, + UNKNOWN = 4, +} +state = RESET; + +static int last_sat_call_result; + +static FILE *out; +static char * prefix; +static int verbosity; +static unsigned level; +static unsigned max_var; +static unsigned size_vars; + +static Lit * __attribute__((aligned(64))) lits; +static Var *vars; +static Rnk *rnks; +static Flt *jwh; +static Cls **htps; +#ifndef NDSC +static Cls **dhtps; +#endif +#ifdef NO_BINARY_CLAUSES +static Ltk *impls; +static Cls impl, cimpl; +static int implvalid, cimplvalid; +#else +static Cls **impls; +#endif +static Lit **trail, **thead, **eot, **ttail, ** ttail2; +#ifndef NADC +static Lit **ttailado; +#endif +static unsigned adecidelevel; +static Lit **als, **alshead, **alstail, **eoals; +static int *fals, *falshead, *eofals; +static int *mass, szmass; +static Lit *failed_assumption; +static int extracted_all_failed_assumptions; +static Rnk **heap, **hhead, **eoh; +static Cls **oclauses, **ohead, **eoo; /* original clauses */ +static Cls **lclauses, **lhead, ** eol; /* learned clauses */ +#ifdef TRACE +static int trace; +static Zhn **zhains, **zhead, **eoz; +static int ocore = -1; +#endif +static FILE * rup; +static int rupstarted; +static int rupvariables; +static int rupclauses; +static Cls *mtcls; +static Cls *conflict; +static Lit **added, **ahead, **eoa; +static Var **marked, **mhead, **eom; +static Var **dfs, **dhead, **eod; +static Cls **resolved, **rhead, **eor; +static unsigned char *buffer, *bhead, *eob; +static Act vinc, lscore, ilvinc, ifvinc; +#ifdef VISCORES +static Act fvinc, nvinc; +#endif +static Act cinc, lcinc, ilcinc, fcinc; +static unsigned srng; +static size_t current_bytes; +static size_t max_bytes; +static size_t recycled; +static double seconds; +static double entered; +static unsigned nentered; +static int measurealltimeinlib; +static char *rline[2]; +static int szrline, rcount; +static double levelsum; +static unsigned iterations; +static int reports; +static int lastrheader = -2; +static unsigned calls; +static unsigned decisions; +static unsigned restarts; +static unsigned simps; +static unsigned fsimplify; +static unsigned isimplify; +static unsigned reductions; +static unsigned lreduce; +static unsigned lreduceadjustcnt; +static unsigned lreduceadjustinc; +static unsigned lastreduceconflicts; +static unsigned llocked; /* locked large learned clauses */ +static unsigned lrestart; +#ifdef NLUBY +static unsigned drestart; +static unsigned ddrestart; +#else +static unsigned lubycnt; +static unsigned lubymaxdelta; +static int waslubymaxdelta; +#endif +static unsigned long long lsimplify; +static unsigned long long propagations; +static unsigned long long lpropagations; +static unsigned fixed; /* top level assignments */ +#ifndef NFL +static unsigned failedlits; +static unsigned ifailedlits; +static unsigned efailedlits; +static unsigned flcalls; +#ifdef STATS +static unsigned flrounds; +static unsigned long long flprops; +static unsigned long long floopsed, fltried, flskipped; +#endif +static unsigned long long fllimit; +static int simplifying; +static Lit ** saved; +static unsigned saved_size; +#endif +static unsigned conflicts; +static unsigned noclauses; /* current number large original clauses */ +static unsigned nlclauses; /* current number large learned clauses */ +static unsigned olits; /* current literals in large original clauses */ +static unsigned llits; /* current literals in large learned clauses */ +static unsigned oadded; /* added original clauses */ +static unsigned ladded; /* added learned clauses */ +static unsigned loadded; /* added original large clauses */ +static unsigned lladded; /* added learned large clauses */ +static unsigned addedclauses; /* oadded + ladded */ +static unsigned vused; /* used variables */ +static unsigned llitsadded; /* added learned literals */ +#ifdef STATS +static unsigned loused; /* used large original clauses */ +static unsigned llused; /* used large learned clauses */ +static unsigned long long visits; +static unsigned long long bvisits; +static unsigned long long tvisits; +static unsigned long long lvisits; +static unsigned long long othertrue; +static unsigned long long othertrue2; +static unsigned long long othertruel; +static unsigned long long othertrue2u; +static unsigned long long othertruelu; +static unsigned long long ltraversals; +static unsigned long long traversals; +#ifdef TRACE +static unsigned long long antecedents; +#endif +static unsigned uips; +static unsigned znts; +static unsigned assumptions; +static unsigned rdecisions; +static unsigned sdecisions; +static size_t srecycled; +static size_t rrecycled; +static unsigned long long derefs; +#endif +static unsigned minimizedllits; +static unsigned nonminimizedllits; +#ifndef NADC +static Lit *** ados, *** hados, *** eados; +static Lit *** adotab; +static unsigned nadotab; +static unsigned szadotab; +static Cls * adoconflict; +static unsigned adoconflicts; +static unsigned adoconflictlimit = UINT_MAX; +static int addingtoado; +static int adodisabled; +#endif +static unsigned long long flips; +#ifdef STATS +static unsigned long long forced; +static unsigned long long assignments; +static unsigned inclreduces; +static unsigned staticphasedecisions; +static unsigned skippedrestarts; +#endif +static int * indices, * ihead, *eoi; +static unsigned sdflips; +static int defaultphase; + +static unsigned long long saved_flips; +static unsigned saved_max_var; +static unsigned min_flipped = UINT_MAX; + +static void * emgr; +static void * (*enew)(void*,size_t); +static void * (*eresize)(void*,void*,size_t,size_t); +static void (*edelete)(void*,void*,size_t); + +#ifdef VISCORES +static FILE * fviscores; +#endif + +static Flt +packflt (unsigned m, int e) +{ + Flt res; + assert (m < FLTMSB); + assert (FLTMINEXPONENT <= e); + assert (e <= FLTMAXEXPONENT); + res = m | ((e + 128) << 24); + return res; +} + +static Flt +base2flt (unsigned m, int e) +{ + if (!m) + return ZEROFLT; + + if (m < FLTMSB) + { + do + { + if (e <= FLTMINEXPONENT) + return ZEROFLT; + + e--; + m <<= 1; + + } + while (m < FLTMSB); + } + else + { + while (m >= FLTCARRY) + { + if (e >= FLTMAXEXPONENT) + return INFFLT; + + e++; + m >>= 1; + } + } + + m &= ~FLTMSB; + return packflt (m, e); +} + +static Flt +addflt (Flt a, Flt b) +{ + unsigned ma, mb, delta; + int ea, eb; + + cmpswapflt (a, b); + if (!b) + return a; + + unpackflt (a, ma, ea); + unpackflt (b, mb, eb); + + assert (ea >= eb); + delta = ea - eb; + mb >>= delta; + if (!mb) + return a; + + ma += mb; + if (ma & FLTCARRY) + { + if (ea == FLTMAXEXPONENT) + return INFFLT; + + ea++; + ma >>= 1; + } + + assert (ma < FLTCARRY); + ma &= FLTMAXMANTISSA; + + return packflt (ma, ea); +} + +static Flt +mulflt (Flt a, Flt b) +{ + unsigned ma, mb; + unsigned long long accu; + int ea, eb; + + cmpswapflt (a, b); + if (!b) + return ZEROFLT; + + unpackflt (a, ma, ea); + unpackflt (b, mb, eb); + + ea += eb; + ea += 24; + if (ea > FLTMAXEXPONENT) + return INFFLT; + + if (ea < FLTMINEXPONENT) + return ZEROFLT; + + accu = ma; + accu *= mb; + accu >>= 24; + + if (accu >= FLTCARRY) + { + if (ea == FLTMAXEXPONENT) + return INFFLT; + + ea++; + accu >>= 1; + + if (accu >= FLTCARRY) + return INFFLT; + } + + assert (accu < FLTCARRY); + assert (accu & FLTMSB); + + ma = accu; + ma &= ~FLTMSB; + + return packflt (ma, ea); +} + +static int +ISDIGIT (char c) +{ + return '0' <= c && c <= '9'; +} + +static Flt +ascii2flt (const char *str) +{ + Flt ten = base2flt (10, 0); + Flt onetenth = base2flt (26843546, -28); + Flt res = ZEROFLT, tmp, base; + const char *p = str; + char ch; + + ch = *p++; + + if (ch != '.') + { + if (!ISDIGIT (ch)) + return INFFLT; /* better abort ? */ + + res = base2flt (ch - '0', 0); + + while ((ch = *p++)) + { + if (ch == '.') + break; + + if (!ISDIGIT (ch)) + return INFFLT; /* better abort? */ + + res = mulflt (res, ten); + tmp = base2flt (ch - '0', 0); + res = addflt (res, tmp); + } + } + + if (ch == '.') + { + ch = *p++; + if (!ISDIGIT (ch)) + return INFFLT; /* better abort ? */ + + base = onetenth; + tmp = mulflt (base2flt (ch - '0', 0), base); + res = addflt (res, tmp); + + while ((ch = *p++)) + { + if (!ISDIGIT (ch)) + return INFFLT; /* better abort? */ + + base = mulflt (base, onetenth); + tmp = mulflt (base2flt (ch - '0', 0), base); + res = addflt (res, tmp); + } + } + + return res; +} + +#if defined(VISCORES) + +static double +flt2double (Flt f) +{ + double res; + unsigned m; + int e, i; + + unpackflt (f, m, e); + res = m; + + if (e < 0) + { + for (i = e; i < 0; i++) + res *= 0.5; + } + else + { + for (i = 0; i < e; i++) + res *= 2.0; + } + + return res; +} + +#endif + +static int +log2flt (Flt a) +{ + return FLTEXPONENT (a) + 24; +} + +static int +cmpflt (Flt a, Flt b) +{ + if (a < b) + return -1; + + if (a > b) + return 1; + + return 0; +} + +static void * +new (size_t size) +{ + size_t bytes; + Blk *b; + + if (!size) + return 0; + + bytes = size + SIZE_OF_BLK; + + if (enew) + b = enew (emgr, bytes); + else + b = malloc (bytes); + + ABORTIF (!b, "out of memory in 'new'"); +#ifndef NDEBUG + b->header.size = size; +#endif + current_bytes += size; + if (current_bytes > max_bytes) + max_bytes = current_bytes; + return b->data; +} + +static void +delete (void *void_ptr, size_t size) +{ + size_t bytes; + Blk *b; + + if (!void_ptr) + { + assert (!size); + return; + } + + assert (size); + b = PTR2BLK (void_ptr); + + assert (size <= current_bytes); + current_bytes -= size; + + assert (b->header.size == size); + + bytes = size + SIZE_OF_BLK; + if (edelete) + edelete (emgr, b, bytes); + else + free (b); +} + +static void * +resize (void *void_ptr, size_t old_size, size_t new_size) +{ + size_t old_bytes, new_bytes; + Blk *b; + + b = PTR2BLK (void_ptr); + + assert (old_size <= current_bytes); + current_bytes -= old_size; + + if ((old_bytes = old_size)) + { + assert (old_size && b->header.size == old_size); + old_bytes += SIZE_OF_BLK; + } + else + assert (!b); + + if ((new_bytes = new_size)) + new_bytes += SIZE_OF_BLK; + + if (eresize) + b = eresize (emgr, b, old_bytes, new_bytes); + else + b = realloc (b, new_bytes); + + if (!new_size) + { + assert (!b); + return 0; + } + + ABORTIF (!b, "out of memory in 'resize'"); +#ifndef NDEBUG + b->header.size = new_size; +#endif + + current_bytes += new_size; + if (current_bytes > max_bytes) + max_bytes = current_bytes; + + return b->data; +} + +static unsigned +int2unsigned (int l) +{ + return (l < 0) ? 1 + 2 * -l : 2 * l; +} + +static Lit * +int2lit (int l) +{ + return lits + int2unsigned (l); +} + +static Lit ** +end_of_lits (Cls * cls) +{ + return cls->lits + cls->size; +} + +static int +lit2idx (Lit * lit) +{ + return (lit - lits) / 2; +} + +static int +lit2sign (Lit * lit) +{ + return ((lit - lits) & 1) ? -1 : 1; +} + + +static int +lit2int (Lit * l) +{ + return lit2idx (l) * lit2sign (l); +} + +#if !defined(NDEBUG) || defined(LOGGING) + +static void +dumplits (Lit ** lits, Lit ** eol) +{ + int first; + Lit ** p; + + if (lits == eol) + { + /* empty clause */ + } + else if (lits + 1 == eol) + { + fprintf (out, "%d ", lit2int (lits[0])); + } + else + { + assert (lits + 2 <= eol); + first = (abs (lit2int (lits[0])) > abs (lit2int (lits[1]))); + fprintf (out, "%d ", lit2int (lits[first])); + fprintf (out, "%d ", lit2int (lits[!first])); + for (p = lits + 2; p < eol; p++) + fprintf (out, "%d ", lit2int (*p)); + } + + fputc ('0', out); +} + +static void +dumpcls (Cls * cls) +{ + Lit **eol; + + if (cls) + { + eol = end_of_lits (cls); + dumplits (cls->lits, eol); +#ifdef TRACE + if (trace) + fprintf (out, " clause(%u)", CLS2IDX (cls)); +#endif + } + else + fputs ("DECISION", out); +} + +static void +dumpclsnl (Cls * cls) +{ + dumpcls (cls); + fputc ('\n', out); +} + +void +dumpcnf (void) +{ + Cls **p, *cls; + + for (p = SOC; p != EOC; p = NXC (p)) + { + cls = *p; + + if (!cls) + continue; + +#ifdef TRACE + if (cls->collected) + continue; +#endif + + dumpclsnl (*p); + } +} + +#endif + +static void +delete_prefix (void) +{ + if (!prefix) + return; + + delete (prefix, strlen (prefix) + 1); + prefix = 0; +} + +static void +new_prefix (const char * str) +{ + delete_prefix (); + assert (str); + prefix = new (strlen (str) + 1); + strcpy (prefix, str); +} + +static void +init (void) +{ + static int count; + + ABORTIF (state != RESET, "API usage: multiple initializations"); + + count = 3 - !enew - !eresize - !edelete; + ABORTIF (count && !enew, "API usage: missing 'picosat_set_new'"); + ABORTIF (count && !eresize, "API usage: missing 'picosat_set_resize'"); + ABORTIF (count && !edelete, "API usage: missing 'picosat_set_delete'"); + + assert (!max_var); /* check for proper reset */ + assert (!size_vars); /* check for proper reset */ + + size_vars = 1; + + NEWN (lits, 2 * size_vars); + NEWN (jwh, 2 * size_vars); + NEWN (htps, 2 * size_vars); +#ifndef NDSC + NEWN (dhtps, 2 * size_vars); +#endif + NEWN (impls, 2 * size_vars); + NEWN (vars, size_vars); + NEWN (rnks, size_vars); + + ENLARGE (heap, hhead, eoh); /* because '0' pos denotes not on heap */ + hhead = heap + 1; + + vinc = base2flt (1, 0); /* initial variable activity */ + ifvinc = ascii2flt ("1.05"); /* variable score rescore factor */ +#ifdef VISCORES + fvinc = ascii2flt ("0.9523809"); /* 1/f = 1/1.1 */ + nvinc = ascii2flt ("0.0476191"); /* 1 - 1/f = 1 - 1/1.1 */ +#endif + lscore = base2flt (1, 90); /* variable activity rescore limit */ + ilvinc = base2flt (1, -90); /* inverse of 'lscore' */ + + cinc = base2flt (1, 0); /* initial clause activity */ + fcinc = ascii2flt ("1.001"); /* clause activity rescore factor */ + lcinc = base2flt (1, 90); /* clause activity rescore limit */ + ilcinc = base2flt (1, -90); /* inverse of 'ilcinc' */ + + lreduceadjustcnt = lreduceadjustinc = 100; + lpropagations = ~0ull; + + out = stdout; + new_prefix ("c "); + verbosity = 0; + +#ifdef NO_BINARY_CLAUSES + memset (&impl, 0, sizeof (impl)); + impl.size = 2; + + memset (&cimpl, 0, sizeof (impl)); + cimpl.size = 2; +#endif + +#ifdef VISCORES + fviscores = popen ( + "/usr/bin/gnuplot -background black" + " -xrm 'gnuplot*textColor:white'" + " -xrm 'gnuplot*borderColor:white'" + " -xrm 'gnuplot*axisColor:white'" + , "w"); + fprintf (fviscores, "unset key\n"); + // fprintf (fviscores, "set log y\n"); + fflush (fviscores); + system ("rm -rf /tmp/picosat-viscores"); + system ("mkdir /tmp/picosat-viscores"); + system ("mkdir /tmp/picosat-viscores/data"); +#ifdef WRITEGIF + system ("mkdir /tmp/picosat-viscores/gif"); + fprintf (fviscores, + "set terminal gif giant animate opt size 1024,768 x000000 xffffff" + "\n"); + + fprintf (fviscores, + "set output \"/tmp/picosat-viscores/gif/animated.gif\"\n"); +#endif +#endif + defaultphase = 2; + state = READY; + last_sat_call_result = 0; +} + +static size_t +bytes_clause (unsigned size, unsigned learned) +{ + size_t res; + + res = sizeof (Cls); + res += size * sizeof (Lit *); + res -= 2 * sizeof (Lit *); + + if (learned && size > 2) + res += sizeof (Act); /* add activity */ + +#ifdef TRACE + if (trace) + res += sizeof (Trd); /* add trace data */ +#endif + + return res; +} + +static Cls * +new_clause (unsigned size, unsigned learned) +{ + size_t bytes; + void * tmp; +#ifdef TRACE + Trd *trd; +#endif + Cls *res; + + bytes = bytes_clause (size, learned); + tmp = new (bytes); + +#ifdef TRACE + if (trace) + { + trd = tmp; + + if (learned) + trd->idx = LIDX2IDX (lhead - lclauses); + else + trd->idx = OIDX2IDX (ohead - oclauses); + + res = trd->cls; + } + else +#endif + res = tmp; + + res->size = size; + res->learned = learned; + + res->collect = 0; +#ifndef NDEBUG + res->connected = 0; +#endif + res->locked = 0; + res->fixed = 0; + res->used = 0; +#ifdef TRACE + res->core = 0; +#ifndef NDEBUG + res->collected = 0; +#endif +#endif + + if (learned && size > 2) + *CLS2ACT (res) = cinc; + + return res; +} + +static void +delete_clause (Cls * cls) +{ + size_t bytes; +#ifdef TRACE + Trd *trd; +#endif + + bytes = bytes_clause (cls->size, cls->learned); + +#ifdef TRACE + if (trace) + { + trd = CLS2TRD (cls); + delete (trd, bytes); + } + else +#endif + delete (cls, bytes); +} + +static void +delete_clauses (void) +{ + Cls **p; + for (p = SOC; p != EOC; p = NXC (p)) + if (*p) + delete_clause (*p); + + DELETEN (oclauses, eoo - oclauses); + DELETEN (lclauses, eol - lclauses); + + ohead = eoo = lhead = eol = 0; +} + +#ifdef TRACE + +static void +delete_zhain (Zhn * zhain) +{ + const Znt *p, *znt; + + assert (zhain); + + znt = zhain->znt; + for (p = znt; *p; p++) + ; + + delete (zhain, sizeof (Zhn) + (p - znt) + 1); +} + +static void +delete_zhains (void) +{ + Zhn **p, *z; + for (p = zhains; p < zhead; p++) + if ((z = *p)) + delete_zhain (z); + + DELETEN (zhains, eoz - zhains); + eoz = zhead = 0; +} + +#endif + +#ifdef NO_BINARY_CLAUSES +static void +lrelease (Ltk * stk) +{ + if (stk->start) + DELETEN (stk->start, (1 << (stk->ldsize))); + memset (stk, 0, sizeof (*stk)); +} +#endif + +#ifndef NADC + +static unsigned +llength (Lit ** a) +{ + Lit ** p; + for (p = a; *p; p++) + ; + return p - a; +} + +static void +resetadoconflict (void) +{ + assert (adoconflict); + delete_clause (adoconflict); + adoconflict = 0; +} + +static void +reset_ados (void) +{ + Lit *** p; + + for (p = ados; p < hados; p++) + DELETEN (*p, llength (*p) + 1); + + DELETEN (ados, eados - ados); + hados = eados = 0; + + DELETEN (adotab, szadotab); + szadotab = nadotab = 0; + + if (adoconflict) + resetadoconflict (); + + adoconflicts = 0; + adoconflictlimit = UINT_MAX; + adodisabled = 0; +} + +#endif + +static void +reset (void) +{ + ABORTIF (state == RESET, "API usage: reset without initialization"); + + delete_clauses (); +#ifdef TRACE + delete_zhains (); +#endif +#ifdef NO_BINARY_CLAUSES + implvalid = 0; + cimplvalid = 0; + { + unsigned i; + for (i = 2; i <= 2 * max_var + 1; i++) + lrelease (impls + i); + } +#endif +#ifndef NADC + reset_ados (); +#endif +#ifndef NFL + DELETEN (saved, saved_size); + saved_size = 0; +#endif + DELETEN (htps, 2 * size_vars); +#ifndef NDSC + DELETEN (dhtps, 2 * size_vars); +#endif + DELETEN (impls, 2 * size_vars); + DELETEN (lits, 2 * size_vars); + DELETEN (jwh, 2 * size_vars); + DELETEN (vars, size_vars); + DELETEN (rnks, size_vars); + + DELETEN (trail, eot - trail); + trail = ttail = ttail2 = thead = eot = 0; +#ifndef NADC + ttailado = 0; +#endif + + DELETEN (heap, eoh - heap); + heap = hhead = eoh = 0; + + DELETEN (als, eoals - als); + als = eoals = alshead = alstail = 0; + extracted_all_failed_assumptions = 0; + failed_assumption = 0; + adecidelevel = 0; + DELETEN (fals, eofals - fals); + fals = eofals = falshead = 0; + DELETEN (mass, szmass); + szmass = 0; + mass = 0; + + size_vars = 0; + max_var = 0; + + mtcls = 0; +#ifdef TRACE + ocore = -1; +#endif + conflict = 0; + + DELETEN (added, eoa - added); + eoa = ahead = 0; + + DELETEN (marked, eom - marked); + eom = mhead = 0; + + DELETEN (dfs, eod - dfs); + eod = dhead = 0; + + DELETEN (resolved, eor - resolved); + eor = rhead = 0; + + DELETEN (buffer, eob - buffer); + eob = bhead = 0; + + DELETEN (indices, eoi - indices); + eoi = ihead = 0; + + delete_prefix (); + + delete (rline[0], szrline); + delete (rline[1], szrline); + rline[0] = rline[1] = 0; + szrline = rcount = 0; + assert (getenv ("LEAK") || !current_bytes); /* found leak if failing */ + max_bytes = 0; + recycled = 0; + current_bytes = 0; + + lrestart = 0; + lreduce = 0; + lastreduceconflicts = 0; + llocked = 0; + lsimplify = 0; + fsimplify = 0; + + seconds = 0; + entered = 0; + nentered = 0; + measurealltimeinlib = 0; + + levelsum = 0.0; + calls = 0; + decisions = 0; + restarts = 0; + simps = 0; + iterations = 0; + reports = 0; + lastrheader = -2; + fixed = 0; +#ifndef NFL + failedlits = 0; + simplifying = 0; + fllimit = 0; +#ifdef STATS + efailedlits = ifailedlits = 0; + fltried = flskipped = floopsed = 0; + flcalls = flrounds = 0; + flprops = 0; +#endif +#endif + propagations = 0; + conflicts = 0; + noclauses = 0; + oadded = 0; + lladded = 0; + loadded = 0; + olits = 0; + nlclauses = 0; + ladded = 0; + addedclauses = 0; + llits = 0; + out = 0; +#ifdef TRACE + trace = 0; +#endif + rup = 0; + rupstarted = 0; + rupclauses = 0; + rupvariables = 0; + level = 0; + + reductions = 0; + + vused = 0; + llitsadded = 0; +#ifdef STATS + loused = 0; + llused = 0; + visits = 0; + bvisits = 0; + tvisits = 0; + lvisits = 0; + othertrue = 0; + othertrue2 = 0; + othertruel = 0; + othertrue2u = 0; + othertruelu = 0; + ltraversals = 0; + traversals = 0; +#ifndef NO_BINARY_CLAUSES + antecedents = 0; +#endif + znts = 0; + uips = 0; + assumptions = 0; + rdecisions = 0; + sdecisions = 0; + srecycled = 0; + rrecycled = 0; +#endif + minimizedllits = 0; + nonminimizedllits = 0; + state = RESET; + srng = 0; + + saved_flips = 0; + saved_max_var = 0; + min_flipped = UINT_MAX; + + flips = 0; +#ifdef STATS + forced = 0; + assignments = 0; +#endif + + sdflips = 0; + defaultphase = 2; + +#ifdef STATS + staticphasedecisions = 0; + inclreduces = 0; + skippedrestarts = 0; +#endif + + emgr = 0; + enew = 0; + eresize = 0; + edelete = 0; +#ifdef VISCORES + pclose (fviscores); + fviscores = 0; +#endif +} + +inline static void +tpush (Lit * lit) +{ + assert (lits < lit && lit <= lits + 2* max_var + 1); + if (thead == eot) + { + unsigned ttail2count = ttail2 - trail; + unsigned ttailcount = ttail - trail; +#ifndef NADC + unsigned ttailadocount = ttailado - trail; +#endif + ENLARGE (trail, thead, eot); + ttail = trail + ttailcount; + ttail2 = trail + ttail2count; +#ifndef NADC + ttailado = trail + ttailadocount; +#endif + } + + *thead++ = lit; +} + +static void +assign_reason (Var * v, Cls * reason) +{ +#ifdef NO_BINARY_CLAUSES + assert (reason != &impl); +#endif + v->reason = reason; +} + +static void +assign_phase (Lit * lit) +{ + unsigned new_phase, idx; + Var * v = LIT2VAR (lit); + +#ifndef NFL + /* In 'simplifying' mode we only need to keep 'min_flipped' up to date if + * we force assignments on the top level. The other assignments will be + * undone and thus we can keep the old saved value of the phase. + */ + if (!level || !simplifying) +#endif + { + new_phase = (LIT2SGN (lit) > 0); + + if (v->assigned) + { + sdflips -= sdflips/FFLIPPED; + + if (new_phase != v->phase) + { + assert (FFLIPPEDPREC >= FFLIPPED); + sdflips += FFLIPPEDPREC / FFLIPPED; + flips++; + + idx = lit2idx (lit); + if (idx < min_flipped) + min_flipped = idx; + + NOLOG (fprintf (out, "%sflipped %d\n", prefix, lit2int (lit))); + } + } + + v->phase = new_phase; + v->assigned = 1; + } + + lit->val = TRUE; + NOTLIT (lit)->val = FALSE; +} + +inline static void +assign (Lit * lit, Cls * reason) +{ + Var * v = LIT2VAR (lit); + assert (lit->val == UNDEF); +#ifdef STATS + assignments++; +#endif + v->level = level; + assign_phase (lit); + assign_reason (v, reason); + tpush (lit); +} + +inline static int +cmp_added (Lit * k, Lit * l) +{ + Val a = k->val, b = l->val; + Var *u, *v; + int res; + + if (a == UNDEF && b != UNDEF) + return -1; + + if (a != UNDEF && b == UNDEF) + return 1; + + u = LIT2VAR (k); + v = LIT2VAR (l); + + if (a != UNDEF) + { + assert (b != UNDEF); + res = v->level - u->level; + if (res) + return res; /* larger level first */ + } + + res = cmpflt (VAR2RNK (v)->score, VAR2RNK (u)->score); + if (res) + return res; /* larger activity first */ + + return u - v; /* smaller index first */ +} + +static void +sorttwolits (Lit ** v) +{ + Lit * a = v[0], * b = v[1]; + + assert (a != b); + + if (a < b) + return; + + v[0] = b; + v[1] = a; +} + +inline static void +sortlits (Lit ** v, unsigned size) +{ + if (size == 2) + sorttwolits (v); /* same order with and with out 'NO_BINARY_CLAUSES' */ + else + sort (Lit *, cmp_added, v, size); +} + +#ifdef NO_BINARY_CLAUSES +static Cls * +setimpl (Lit * a, Lit * b) +{ + assert (!implvalid); + assert (impl.size == 2); + + impl.lits[0] = a; + impl.lits[1] = b; + + sorttwolits (impl.lits); + implvalid = 1; + + return &impl; +} + +static void +resetimpl (void) +{ + assert (implvalid); + implvalid = 0; +} + +static Cls * +setcimpl (Lit * a, Lit * b) +{ + assert (!cimplvalid); + assert (cimpl.size == 2); + + cimpl.lits[0] = a; + cimpl.lits[1] = b; + + sorttwolits (cimpl.lits); + cimplvalid = 1; + + return &cimpl; +} + +static void +resetcimpl (void) +{ + assert (cimplvalid); + cimplvalid = 0; +} + +#endif + +static int +cmp_ptr (void *l, void *k) +{ + return ((char*)l) - (char*)k; /* arbitrarily already reverse */ +} + +static int +cmp_rnk (Rnk * r, Rnk * s) +{ + if (!r->moreimportant && s->moreimportant) + return -1; + + if (r->moreimportant && !s->moreimportant) + return 1; + + if (!r->lessimportant && s->lessimportant) + return 1; + + if (r->lessimportant && !s->lessimportant) + return -1; + + if (r->score < s->score) + return -1; + + if (r->score > s->score) + return 1; + + return -cmp_ptr (r, s); +} + +static void +hup (Rnk * v) +{ + int upos, vpos; + Rnk *u; + +#ifndef NFL + assert (!simplifying); +#endif + + vpos = v->pos; + + assert (0 < vpos); + assert (vpos < hhead - heap); + assert (heap[vpos] == v); + + while (vpos > 1) + { + upos = vpos / 2; + + u = heap[upos]; + + if (cmp_rnk (u, v) > 0) + break; + + heap[vpos] = u; + u->pos = vpos; + + vpos = upos; + } + + heap[vpos] = v; + v->pos = vpos; +} + +static Cls *add_simplified_clause (int learned); + +inline static void +add_antecedent (Cls * c) +{ + assert (c); + +#ifdef NO_BINARY_CLAUSES + if (ISLITREASON (c)) + return; + + if (c == &impl) + return; +#else +#ifdef STATS + antecedents++; +#endif +#endif + if (rhead == eor) + ENLARGE (resolved, rhead, eor); + + assert (rhead < eor); + *rhead++ = c; +} + +#ifdef TRACE + +#ifdef NO_BINARY_CLAUSES +#error "can not combine TRACE and NO_BINARY_CLAUSES" +#endif + +#endif /* TRACE */ + +static void +add_lit (Lit * lit) +{ + assert (lit); + + if (ahead == eoa) + ENLARGE (added, ahead, eoa); + + *ahead++ = lit; +} + +static void +push_var_as_marked (Var * v) +{ + if (mhead == eom) + ENLARGE (marked, mhead, eom); + + *mhead++ = v; +} + +static void +mark_var (Var * v) +{ + assert (!v->mark); + v->mark = 1; + push_var_as_marked (v); +} + +/* Whenever we have a top level derived unit we really should derive a unit + * clause otherwise the resolutions in 'add_simplified_clause' become + * incorrect. + */ +static Cls * +resolve_top_level_unit (Lit * lit, Cls * reason) +{ + unsigned count_resolved; + Lit **p, **eol, *other; + Var *u, *v; + + assert (rhead == resolved); + assert (ahead == added); + + add_lit (lit); + add_antecedent (reason); + count_resolved = 1; + v = LIT2VAR (lit); + + eol = end_of_lits (reason); + for (p = reason->lits; p < eol; p++) + { + other = *p; + u = LIT2VAR (other); + if (u == v) + continue; + + add_antecedent (u->reason); + count_resolved++; + } + + /* Some of the literals could be assumptions. If at least one + * variable is not an assumption, we should resolve. + */ + if (count_resolved >= 2) + { +#ifdef NO_BINARY_CLAUSES + if (reason == &impl) + resetimpl (); +#endif + reason = add_simplified_clause (1); +#ifdef NO_BINARY_CLAUSES + if (reason->size == 2) + { + assert (reason == &impl); + other = reason->lits[0]; + if (lit == other) + other = reason->lits[1]; + assert (other->val == FALSE); + reason = LIT2REASON (NOTLIT (other)); + resetimpl (); + } +#endif + assign_reason (v, reason); + } + else + { + ahead = added; + rhead = resolved; + } + + return reason; +} + +static void +fixvar (Var * v) +{ + Rnk * r; + + assert (VAR2LIT (v) != UNDEF); + assert (!v->level); + + fixed++; + + r = VAR2RNK (v); + r->score = INFFLT; + +#ifndef NFL + if (simplifying) + return; +#endif + + if (!r->pos) + return; + + hup (r); +} + +static void +use_var (Var * v) +{ + if (v->used) + return; + + v->used = 1; + vused++; +} + +static void +assign_forced (Lit * lit, Cls * reason) +{ + Var *v; + + assert (reason); + assert (lit->val == UNDEF); + +#ifdef STATS + forced++; +#endif + assign (lit, reason); + +#ifdef NO_BINARY_CLAUSES + assert (reason != &impl); + if (ISLITREASON (reason)) + reason = setimpl (lit, NOTLIT (REASON2LIT (reason))); +#endif + LOG (fprintf (out, + "%sassign %d at level %d by ", + prefix, lit2int (lit), level); + dumpclsnl (reason)); + + v = LIT2VAR (lit); + if (!level) + use_var (v); + + if (reason && !level && reason->size > 1) + reason = resolve_top_level_unit (lit, reason); + +#ifdef NO_BINARY_CLAUSES + if (ISLITREASON (reason) || reason == &impl) + { + /* DO NOTHING */ + } + else +#endif + if (reason) + { + assert (!reason->locked); + reason->locked = 1; + if (reason->learned && reason->size > 2) + llocked++; + } + +#ifdef NO_BINARY_CLAUSES + if (reason == &impl) + resetimpl (); +#endif + + if (!level) + fixvar (v); +} + +#ifdef NO_BINARY_CLAUSES + +static void +lpush (Lit * lit, Cls * cls) +{ + int pos = (cls->lits[0] == lit); + Ltk * s = LIT2IMPLS (lit); + unsigned oldsize, newsize; + + assert (cls->size == 2); + + if (!s->start) + { + assert (!s->count); + assert (!s->ldsize); + NEWN (s->start, 1); + } + else + { + oldsize = (1 << (s->ldsize)); + assert (s->count <= oldsize); + if (s->count == oldsize) + { + newsize = 2 * oldsize; + RESIZEN (s->start, oldsize, newsize); + s->ldsize++; + } + } + + s->start[s->count++] = cls->lits[pos]; +} + +#endif + +static void +connect_head_tail (Lit * lit, Cls * cls) +{ + Cls ** s; + assert (cls->size >= 1); + if (cls->size == 2) + { +#ifdef NO_BINARY_CLAUSES + lpush (lit, cls); + return; +#else + s = LIT2IMPLS (lit); +#endif + } + else + s = LIT2HTPS (lit); + + if (cls->lits[0] != lit) + { + assert (cls->size >= 2); + assert (cls->lits[1] == lit); + cls->next[1] = *s; + } + else + cls->next[0] = *s; + + *s = cls; +} + +#ifdef TRACE +static void +zpush (Zhn * zhain) +{ + assert (trace); + + if (zhead == eoz) + ENLARGE (zhains, zhead, eoz); + + *zhead++ = zhain; +} + +static int +cmp_resolved (Cls * c, Cls * d) +{ + assert (trace); + + return CLS2IDX (c) - CLS2IDX (d); +} + +static void +bpushc (unsigned char ch) +{ + if (bhead == eob) + ENLARGE (buffer, bhead, eob); + + *bhead++ = ch; +} + +static void +bpushu (unsigned u) +{ + while (u & ~0x7f) + { + bpushc (u | 0x80); + u >>= 7; + } + + bpushc (u); +} + +static void +bpushd (unsigned prev, unsigned this) +{ + unsigned delta; + assert (prev < this); + delta = this - prev; + bpushu (delta); +} + +static void +add_zhain (void) +{ + unsigned prev, this, count, rcount; + Cls **p, *c; + Zhn *res; + + assert (trace); + assert (bhead == buffer); + assert (rhead > resolved); + + rcount = rhead - resolved; + sort (Cls *, cmp_resolved, resolved, rcount); + + prev = 0; + for (p = resolved; p < rhead; p++) + { + c = *p; + this = CLS2TRD (c)->idx; + bpushd (prev, this); + prev = this; + } + bpushc (0); + + count = bhead - buffer; + + res = new (sizeof (Zhn) + count); + res->core = 0; + res->ref = 0; + memcpy (res->znt, buffer, count); + + bhead = buffer; +#ifdef STATS + znts += count - 1; +#endif + zpush (res); +} + +#endif + +static void +add_resolved (int learned) +{ +#if defined(STATS) || defined(TRACE) + Cls **p, *c; + + for (p = resolved; p < rhead; p++) + { + c = *p; + if (c->used) + continue; + + c->used = 1; + + if (c->size <= 2) + continue; + +#ifdef STATS + if (c->learned) + llused++; + else + loused++; +#endif + } +#endif + +#ifdef TRACE + if (learned && trace) + add_zhain (); +#else + (void) learned; +#endif + rhead = resolved; +} + +static void +incjwh (Cls * cls) +{ + Lit **p, *lit, ** eol; + Flt * f, inc, sum; + unsigned size = 0; + Var * v; + Val val; + + eol = end_of_lits (cls); + + for (p = cls->lits; p < eol; p++) + { + lit = *p; + val = lit->val; + + if (val && level > 0) + { + v = LIT2VAR (lit); + if (v->level > 0) + val = UNDEF; + } + + if (val == TRUE) + return; + + if (val != FALSE) + size++; + } + + inc = base2flt (1, -size); + + for (p = cls->lits; p < eol; p++) + { + lit = *p; + f = LIT2JWH (lit); + sum = addflt (*f, inc); + *f = sum; + } +} + +static void +write_rup_header (FILE * file) +{ + char line[80]; + int i; + + sprintf (line, "%%RUPD32 %u %u", rupvariables, rupclauses); + + fputs (line, file); + for (i = 255 - strlen (line); i >= 0; i--) + fputc (' ', file); + + fputc ('\n', file); + fflush (file); +} + +static void +write_int (int d, FILE * file) +{ + static char write_int_buffer[16]; + unsigned tmp; + char * res; + int sign; + + assert (sizeof d <= 4); + + res = write_int_buffer + sizeof write_int_buffer; + *--res = 0; + + sign = (d < 0); + + if (sign) + tmp = (unsigned) -d; + else + tmp = d; + + do { + assert (res > write_int_buffer); + *--res = '0' + (tmp % 10); + tmp /= 10; + } while (tmp); + + if (sign) + { + assert (res > write_int_buffer); + *--res = '-'; + } + + fputs (res, file); +} + +static Cls * +add_simplified_clause (int learned) +{ + unsigned num_true, num_undef, num_false, idx, size, count_resolved; + Lit **p, **q, *lit, ** end; + Cls *res, * reason; + Val val; + Var *v; + +REENTER: + + size = ahead - added; + + add_resolved (learned); + + if (learned) + { + ladded++; + llitsadded += size; + if (size > 2) + { + lladded++; + nlclauses++; + llits += size; + } + } + else + { + oadded++; + if (size > 2) + { + loadded++; + noclauses++; + olits += size; + } + } + + addedclauses++; + assert (addedclauses == ladded + oadded); + +#ifdef NO_BINARY_CLAUSES + if (size == 2) + res = setimpl (added[0], added[1]); + else +#endif + { + sortlits (added, size); + + if (learned) + { + if (lhead == eol) + { + ENLARGE (lclauses, lhead, eol); + + /* A very difficult to find bug, which only occurs if the + * learned clauses stack is immediately allocated before the + * original clauses stack without padding. In this case, we + * have 'SOC == EOC', which terminates all loops using the + * idiom 'for (p = SOC; p != EOC; p = NXC(p))' immediately. + * Unfortunately this occurred in 'fix_clause_lits' after + * using a recent version of the memory allocator of 'Google' + * perftools in the context of one large benchmark for + * 'boolector'. + */ + if (eol == oclauses) + ENLARGE (lclauses, lhead, eol); + } + + idx = LIDX2IDX (lhead - lclauses); + } + else + { + if (ohead == eoo) + { + ENLARGE (oclauses, ohead, eoo); + if (eol == oclauses) + ENLARGE (oclauses, ohead, eoo); /* dito */ + } + + idx = OIDX2IDX (ohead - oclauses); + } + + assert (eol != oclauses); /* dito */ + + res = new_clause (size, learned); + +#if !defined(NDEBUG) && defined(TRACE) + if (trace) + assert (CLS2IDX (res) == idx); +#endif + if (learned) + *lhead++ = res; + else + *ohead++ = res; + +#if !defined(NDEBUG) && defined(TRACE) + if (trace && learned) + assert (zhead - zhains == lhead - lclauses); +#endif + assert (lhead != oclauses); /* dito */ + } + + if (learned && rup) + { + if (!rupstarted) + { + write_rup_header (rup); + rupstarted = 1; + } + } + + num_true = num_undef = num_false = 0; + + q = res->lits; + for (p = added; p < ahead; p++) + { + lit = *p; + *q++ = lit; + + if (learned && rup) + { + write_int (lit2int (lit), rup); + fputc (' ', rup); + } + + val = lit->val; + + num_true += (val == TRUE); + num_undef += (val == UNDEF); + num_false += (val == FALSE); + + v = LIT2VAR (lit); + } + assert (num_false + num_true + num_undef == size); + + if (learned && rup) + fputs ("0\n", rup); + + ahead = added; /* reset */ + + if (size > 0) + { + connect_head_tail (res->lits[0], res); + if (size > 1) + connect_head_tail (res->lits[1], res); + } + + if (size == 0) + { + if (!mtcls) + mtcls = res; + } + +#ifdef NO_BINARY_CLAUSES + if (size != 2) +#endif +#ifndef NDEBUG + res->connected = 1; +#endif + + LOG (fprintf (out, "%s%s ", prefix, learned ? "learned" : "original"); + dumpclsnl (res)); + + /* Shrink clause by resolving it against top level assignments. + */ + if (!level && num_false > 0) + { + assert (ahead == added); + assert (rhead == resolved); + + count_resolved = 1; + add_antecedent (res); + + end = end_of_lits (res); + for (p = res->lits; p < end; p++) + { + lit = *p; + v = LIT2VAR (lit); + use_var (v); + + if (lit->val == FALSE) + { + add_antecedent (v->reason); + count_resolved++; + } + else + add_lit (lit); + } + + assert (count_resolved >= 2); + + learned = 1; +#ifdef NO_BINARY_CLAUSES + if (res == &impl) + resetimpl (); +#endif + goto REENTER; /* and return simplified clause */ + } + + if (!num_true && num_undef == 1) /* unit clause */ + { + lit = 0; + for (p = res->lits; p < res->lits + size; p++) + { + if ((*p)->val == UNDEF) + lit = *p; + + v = LIT2VAR (*p); + use_var (v); + } + assert (lit); + + reason = res; +#ifdef NO_BINARY_CLAUSES + if (size == 2) + { + Lit * other = res->lits[0]; + if (other == lit) + other = res->lits[1]; + + assert (other->val == FALSE); + reason = LIT2REASON (NOTLIT (other)); + } +#endif + assign_forced (lit, reason); + num_true++; + } + + if (num_false == size && !conflict) + { +#ifdef NO_BINARY_CLAUSES + if (res == &impl) + conflict = setcimpl (res->lits[0], res->lits[1]); + else +#endif + conflict = res; + } + + if (!learned && !num_true && num_undef) + incjwh (res); + //FIXME: perhaps sketchy unsound hack +/* #ifdef NO_BINARY_CLAUSES */ +/* if (res == &impl) */ +/* resetimpl (); */ +/* #endif */ + return res; +} + +static int +trivial_clause (void) +{ + Lit **p, **q, *prev; + Var *v; + + sort (Lit *, cmp_ptr, added, ahead - added); + + prev = 0; + q = added; + for (p = q; p < ahead; p++) + { + Lit *this = *p; + + v = LIT2VAR (this); + + if (prev == this) /* skip repeated literals */ + continue; + + /* Top level satisfied ? + */ + if (this->val == TRUE && !v->level) + return 1; + + if (prev == NOTLIT (this))/* found pair of dual literals */ + return 1; + + *q++ = prev = this; + } + + ahead = q; /* shrink */ + + return 0; +} + +static void +simplify_and_add_original_clause (void) +{ + Cls * cls; + + if (trivial_clause ()) + { + ahead = added; + + if (ohead == eoo) + ENLARGE (oclauses, ohead, eoo); + + *ohead++ = 0; + + addedclauses++; + oadded++; + } + else + { + cls = add_simplified_clause (0); +#ifdef NO_BINARY_CLAUSES + if (cls == &impl) + resetimpl (); +#endif + } +} + +#ifndef NADC + +static void +add_ado (void) +{ + unsigned len = ahead - added; + Lit ** ado, ** p, ** q, *lit; + Var * v, * u; + +#ifdef TRACE + assert (!trace); +#endif + + ABORTIF (ados < hados && llength (ados[0]) != len, + "internal: non matching all different constraint object lengths"); + + if (hados == eados) + ENLARGE (ados, hados, eados); + + NEWN (ado, len + 1); + *hados++ = ado; + + p = added; + q = ado; + u = 0; + while (p < ahead) + { + lit = *p++; + v = LIT2VAR (lit); + ABORTIF (v->inado, + "internal: variable in multiple all different objects"); + v->inado = ado; + if (!u && !lit->val) + u = v; + *q++ = lit; + } + + assert (q == ado + len); + *q++ = 0; + + /* TODO simply do a conflict test as in propado */ + + ABORTIF (!u, + "internal: " + "adding fully instantiated all different object not implemented yet"); + + assert (u); + assert (u->inado == ado); + assert (!u->ado); + u->ado = ado; + + ahead = added; +} + +#endif + +static void +hdown (Rnk * r) +{ + unsigned end, rpos, cpos, opos; + Rnk *child, *other; + + assert (r->pos > 0); + assert (heap[r->pos] == r); + + end = hhead - heap; + rpos = r->pos; + + for (;;) + { + cpos = 2 * rpos; + if (cpos >= end) + break; + + opos = cpos + 1; + child = heap[cpos]; + + if (cmp_rnk (r, child) < 0) + { + if (opos < end) + { + other = heap[opos]; + + if (cmp_rnk (child, other) < 0) + { + child = other; + cpos = opos; + } + } + } + else if (opos < end) + { + child = heap[opos]; + + if (cmp_rnk (r, child) >= 0) + break; + + cpos = opos; + } + else + break; + + heap[rpos] = child; + child->pos = rpos; + rpos = cpos; + } + + r->pos = rpos; + heap[rpos] = r; +} + +static Rnk * +htop (void) +{ + assert (hhead > heap); + return heap[1]; +} + +static Rnk * +hpop (void) +{ + Rnk *res, *last; + unsigned end; + + assert (hhead > heap); + + res = heap[1]; + res->pos = 0; + + end = --hhead - heap; + if (end == 1) + return res; + + last = heap[end]; + + heap[last->pos = 1] = last; + hdown (last); + + return res; +} + +inline static void +hpush (Rnk * r) +{ + assert (!r->pos); + + if (hhead == eoh) + ENLARGE (heap, hhead, eoh); + + r->pos = hhead++ - heap; + heap[r->pos] = r; + hup (r); +} + +static void +fix_trail_lits (long delta) +{ + Lit **p; + for (p = trail; p < thead; p++) + *p += delta; +} + +#ifdef NO_BINARY_CLAUSES +static void +fix_impl_lits (long delta) +{ + Ltk * s; + Lit ** p; + + for (s = impls + 2; s < impls + 2 * max_var; s++) + for (p = s->start; p < s->start + s->count; p++) + *p += delta; +} +#endif + +static void +fix_clause_lits (long delta) +{ + Cls **p, *clause; + Lit **q, *lit, **eol; + + for (p = SOC; p != EOC; p = NXC (p)) + { + clause = *p; + if (!clause) + continue; + + q = clause->lits; + eol = end_of_lits (clause); + while (q < eol) + { + assert (q - clause->lits <= (int) clause->size); + lit = *q; + lit += delta; + *q++ = lit; + } + } +} + +static void +fix_added_lits (long delta) +{ + Lit **p; + for (p = added; p < ahead; p++) + *p += delta; +} + +static void +fix_assumed_lits (long delta) +{ + Lit **p; + for (p = als; p < alshead; p++) + *p += delta; +} + +static void +fix_heap_rnks (long delta) +{ + Rnk **p; + + for (p = heap + 1; p < hhead; p++) + *p += delta; +} + +#ifndef NADC + +static void +fix_ado (long delta, Lit ** ado) +{ + Lit ** p; + for (p = ado; *p; p++) + *p += delta; +} + +static void +fix_ados (long delta) +{ + Lit *** p; + + for (p = ados; p < hados; p++) + fix_ado (delta, *p); +} + +#endif + +static void +enlarge (unsigned new_size_vars) +{ + long rnks_delta, lits_delta, vars_delta; + Lit *old_lits = lits; + Rnk *old_rnks = rnks; + Var *old_vars = vars; + + RESIZEN (lits, 2 * size_vars, 2 * new_size_vars); + RESIZEN (jwh, 2 * size_vars, 2 * new_size_vars); + RESIZEN (htps, 2 * size_vars, 2 * new_size_vars); +#ifndef NDSC + RESIZEN (dhtps, 2 * size_vars, 2 * new_size_vars); +#endif + RESIZEN (impls, 2 * size_vars, 2 * new_size_vars); + RESIZEN (vars, size_vars, new_size_vars); + RESIZEN (rnks, size_vars, new_size_vars); + + lits_delta = lits - old_lits; + rnks_delta = rnks - old_rnks; + vars_delta = vars - old_vars; + + fix_trail_lits (lits_delta); + fix_clause_lits (lits_delta); + fix_added_lits (lits_delta); + fix_assumed_lits (lits_delta); +#ifdef NO_BINARY_CLAUSES + fix_impl_lits (lits_delta); +#endif +#ifndef NADC + fix_ados (lits_delta); +#endif + fix_heap_rnks (rnks_delta); + assert (mhead == marked); + + size_vars = new_size_vars; +} + +static void +unassign (Lit * lit) +{ + Cls *reason; + Var *v; + Rnk *r; + + assert (lit->val == TRUE); + + LOG (fprintf (out, "%sunassign %d\n", prefix, lit2int (lit))); + + v = LIT2VAR (lit); + reason = v->reason; + +#ifdef NO_BINARY_CLAUSES + assert (reason != &impl); + if (ISLITREASON (reason)) + { + /* DO NOTHING */ + } + else +#endif + if (reason) + { + assert (reason->locked); + reason->locked = 0; + if (reason->learned && reason->size > 2) + { + assert (llocked > 0); + llocked--; + } + } + + lit->val = UNDEF; + NOTLIT (lit)->val = UNDEF; + + r = VAR2RNK (v); + if (!r->pos) + hpush (r); + +#ifndef NDSC + { + Cls * p, * next, ** q; + + q = LIT2DHTPS (lit); + p = *q; + *q = 0; + + while (p) + { + Lit * other = p->lits[0]; + + if (other == lit) + { + other = p->lits[1]; + q = p->next + 1; + } + else + { + assert (p->lits[1] == lit); + q = p->next; + } + + next = *q; + *q = *LIT2HTPS (other); + *LIT2HTPS (other) = p; + p = next; + } + } +#endif + +#ifndef NADC + if (v->adotabpos) + { + assert (nadotab); + assert (*v->adotabpos == v->ado); + + *v->adotabpos = 0; + v->adotabpos = 0; + + nadotab--; + } +#endif +} + +static Cls * +var2reason (Var * var) +{ + Cls * res = var->reason; +#ifdef NO_BINARY_CLAUSES + Lit * this, * other; + if (ISLITREASON (res)) + { + this = VAR2LIT (var); + if (this->val == FALSE) + this = NOTLIT (this); + + other = REASON2LIT (res); + assert (other->val == TRUE); + assert (this->val == TRUE); + res = setimpl (NOTLIT (other), this); + } +#endif + return res; +} + +static void +mark_clause_to_be_collected (Cls * cls) +{ + assert (!cls->collect); + cls->collect = 1; +} + +static void +undo (unsigned new_level) +{ + Lit *lit; + Var *v; + + while (thead > trail) + { + lit = *--thead; + v = LIT2VAR (lit); + if (v->level == new_level) + { + thead++; /* fix pre decrement */ + break; + } + + unassign (lit); + } + + level = new_level; + ttail = thead; + ttail2 = thead; +#ifndef NADC + ttailado = thead; +#endif + +#ifdef NO_BINARY_CLAUSES + if (conflict == &cimpl) + resetcimpl (); +#endif +#ifndef NADC + if (conflict && conflict == adoconflict) + resetadoconflict (); +#endif + conflict = mtcls; + if (level < adecidelevel) + { + assert (als < alshead); + adecidelevel = 0; + alstail = als; + } + LOG (fprintf (out, "%sback to level %u\n", prefix, level)); +} + +#ifndef NDEBUG + +static int +clause_satisfied (Cls * cls) +{ + Lit **p, **eol, *lit; + + eol = end_of_lits (cls); + for (p = cls->lits; p < eol; p++) + { + lit = *p; + if (lit->val == TRUE) + return 1; + } + + return 0; +} + +static void +original_clauses_satisfied (void) +{ + Cls **p, *cls; + + for (p = oclauses; p < ohead; p++) + { + cls = *p; + + if (!cls) + continue; + + if (cls->learned) + continue; + + assert (clause_satisfied (cls)); + } +} + +static void +assumptions_satisfied (void) +{ + Lit *lit, ** p; + + for (p = als; p < alshead; p++) + { + lit = *p; + assert (lit->val == TRUE); + } +} + +#endif + +static void +sflush (void) +{ + double now = picosat_time_stamp (); + double delta = now - entered; + delta = (delta < 0) ? 0 : delta; + seconds += delta; + entered = now; +} + +static double +mb (void) +{ + return current_bytes / (double) (1 << 20); +} + +static double +avglevel (void) +{ + return decisions ? levelsum / decisions : 0.0; +} + +static void +rheader (void) +{ + assert (lastrheader <= reports); + + if (lastrheader == reports) + return; + + lastrheader = reports; + + fprintf (out, "%s\n", prefix); + fprintf (out, "%s %s\n", prefix, rline[0]); + fprintf (out, "%s %s\n", prefix, rline[1]); + fprintf (out, "%s\n", prefix); +} + +static unsigned +dynamic_flips_per_assignment_per_mille (void) +{ + assert (FFLIPPEDPREC >= 1000); + return sdflips / (FFLIPPEDPREC / 1000); +} + +#ifdef NLUBY + +static int +high_agility (void) +{ + return dynamic_flips_per_assignment_per_mille () >= 200; +} + +static int +very_high_agility (void) +{ + return dynamic_flips_per_assignment_per_mille () >= 250; +} + +#else + +static int +medium_agility (void) +{ + return dynamic_flips_per_assignment_per_mille () >= 230; +} + +#endif + +static void +relemdata (void) +{ + char *p; + int x; + + if (reports < 0) + { + /* strip trailing white space + */ + for (x = 0; x <= 1; x++) + { + p = rline[x] + strlen (rline[x]); + while (p-- > rline[x]) + { + if (*p != ' ') + break; + + *p = 0; + } + } + + rheader (); + } + else + fputc ('\n', out); + + rcount = 0; +} + +static void +relemhead (const char * name, int fp, double val) +{ + int x, y, len, size; + const char *fmt; + unsigned tmp, e; + + if (reports < 0) + { + x = rcount & 1; + y = (rcount / 2) * 12 + x * 6; + + if (rcount == 1) + sprintf (rline[1], "%6s", ""); + + len = strlen (name); + while (szrline <= len + y + 1) + { + size = szrline ? 2 * szrline : 128; + rline[0] = resize (rline[0], szrline, size); + rline[1] = resize (rline[1], szrline, size); + szrline = size; + } + + fmt = (len <= 6) ? "%6s%10s" : "%-10s%4s"; + sprintf (rline[x] + y, fmt, name, ""); + } + else if (val < 0) + { + assert (fp); + + if (val > -100 && (tmp = val * 10.0 - 0.5) > -1000.0) + { + fprintf (out, "-%4.1f ", -tmp / 10.0); + } + else + { + tmp = -val / 10.0 + 0.5; + e = 1; + while (tmp >= 100) + { + tmp /= 10; + e++; + } + + fprintf (out, "-%2ue%u ", tmp, e); + } + } + else + { + if (fp && val < 1000 && (tmp = val * 10.0 + 0.5) < 10000) + { + fprintf (out, "%5.1f ", tmp / 10.0); + } + else if (!fp && (tmp = val) < 100000) + { + fprintf (out, "%5u ", tmp); + } + else + { + tmp = val / 10.0 + 0.5; + e = 1; + + while (tmp >= 1000) + { + tmp /= 10; + e++; + } + + fprintf (out, "%3ue%u ", tmp, e); + } + } + + rcount++; +} + +inline static void +relem (const char *name, int fp, double val) +{ + if (name) + relemhead (name, fp, val); + else + relemdata (); +} + +static unsigned +reduce_limit_on_lclauses (void) +{ + unsigned res = lreduce; + res += llocked; + return res; +} + +static void +report (int level, char type) +{ + int rounds; + + if (verbosity < level) + return; + + sflush (); + + if (!reports) + reports = -1; + + for (rounds = (reports < 0) ? 2 : 1; rounds; rounds--) + { + if (reports >= 0) + fprintf (out, "%s%c ", prefix, type); + + relem ("seconds", 1, seconds); + relem ("level", 1, avglevel ()); + assert (fixed <= max_var); + relem ("variables", 0, max_var - fixed); + relem ("used", 1, PERCENT (vused, max_var)); + relem ("original", 0, noclauses); + relem ("conflicts", 0, conflicts); + //relem ("decisions", 0, decisions); + // relem ("conf/dec", 1, PERCENT(conflicts,decisions)); + // relem ("limit", 0, reduce_limit_on_lclauses ()); + relem ("learned", 0, nlclauses); + // relem ("limit", 1, PERCENT (nlclauses, reduce_limit_on_lclauses ())); + relem ("limit", 0, lreduce); +#ifdef STATS + relem ("learning", 1, PERCENT (llused, lladded)); +#endif + relem ("agility", 1, dynamic_flips_per_assignment_per_mille () / 10.0); + // relem ("original", 0, noclauses); + relem ("MB", 1, mb ()); + // relem ("lladded", 0, lladded); + // relem ("llused", 0, llused); + + relem (0, 0, 0); + + reports++; + } + + /* Adapt this to the number of rows in your terminal. + */ + #define ROWS 25 + + if (reports % (ROWS - 3) == (ROWS - 4)) + rheader (); + + fflush (out); +} + +static int +bcp_queue_is_empty (void) +{ + if (ttail != thead) + return 0; + + if (ttail2 != thead) + return 0; + +#ifndef NADC + if (ttailado != thead) + return 0; +#endif + + return 1; +} + +static int +satisfied (void) +{ + assert (!mtcls); + assert (!failed_assumption); + if (alstail < alshead) + return 0; + assert (!conflict); + assert (bcp_queue_is_empty ()); + return thead == trail + max_var; /* all assigned */ +} + +static void +vrescore (void) +{ + Rnk *p, *eor = rnks + max_var; + for (p = rnks + 1; p <= eor; p++) + if (p->score != INFFLT) + p->score = mulflt (p->score, ilvinc); + vinc = mulflt (vinc, ilvinc);; +#ifdef VISCORES + nvinc = mulflt (nvinc, lscore);; +#endif +} + +static void +inc_score (Var * v) +{ + Flt score; + Rnk *r; + +#ifndef NFL + if (simplifying) + return; +#endif + + if (!v->level) + return; + + r = VAR2RNK (v); + score = r->score; + + assert (score != INFFLT); + + score = addflt (score, vinc); + assert (score < INFFLT); + r->score = score; + if (r->pos > 0) + hup (r); + + if (score > lscore) + vrescore (); +} + +static void +inc_activity (Cls * cls) +{ + Act *p; + + if (!cls->learned) + return; + + if (cls->size <= 2) + return; + + p = CLS2ACT (cls); + *p = addflt (*p, cinc); +} + +static unsigned +hashlevel (unsigned l) +{ + return 1u << (l & 31); +} + +static void +push (Var * v) +{ + if (dhead == eod) + ENLARGE (dfs, dhead, eod); + + *dhead++ = v; +} + +static Var * +pop (void) +{ + assert (dfs < dhead); + return *--dhead; +} + +static void +analyze (void) +{ + unsigned open, minlevel, siglevels, l, old, i, orig; + Lit *this, *other, **p, **q, **eol; + Var *v, *u, **m, *start, *uip; + Cls *c; + + assert (conflict); + + assert (ahead == added); + assert (mhead == marked); + assert (rhead == resolved); + + /* 2. Search for First UIP variable and mark all resolved variables. At + * the same time determine the minimum decision level involved. Increase + * activities of resolved variables. + */ + q = thead; + open = 0; + minlevel = level; + siglevels = 0; + uip = 0; + + c = conflict; + + for (;;) + { + add_antecedent (c); + inc_activity (c); + eol = end_of_lits (c); + for (p = c->lits; p < eol; p++) + { + other = *p; + + if (other->val == TRUE) + continue; + + assert (other->val == FALSE); + + u = LIT2VAR (other); + if (u->mark) + continue; + + u->mark = 1; + inc_score (u); + use_var (u); + + if (u->level == level) + { + open++; + } + else + { + push_var_as_marked (u); + + if (u->level) + { + /* The statistics counter 'nonminimizedllits' sums up the + * number of literals that would be added if only the + * 'first UIP' scheme for learned clauses would be used + * and no clause minimization. + */ + nonminimizedllits++; + + if (u->level < minlevel) + minlevel = u->level; + + siglevels |= hashlevel (u->level); + } + else + { + assert (!u->level); + assert (u->reason); + } + } + } + + do + { + if (q == trail) + { + uip = 0; + goto DONE_FIRST_UIP; + } + + this = *--q; + uip = LIT2VAR (this); + } + while (!uip->mark); + + uip->mark = 0; + + c = var2reason (uip); +#ifdef NO_BINARY_CLAUSES + if (c == &impl) + resetimpl (); +#endif + open--; + if ((!open && level) || !c) + break; + + assert (c); + } + +DONE_FIRST_UIP: + + if (uip) + { + assert (level); + this = VAR2LIT (uip); + this += (this->val == TRUE); + nonminimizedllits++; + minimizedllits++; + add_lit (this); +#ifdef STATS + if (uip->reason) + uips++; +#endif + } + else + assert (!level); + + /* 3. Try to mark more intermediate variables, with the goal to minimize + * the conflict clause. This is a DFS from already marked variables + * backward through the implication graph. It tries to reach other marked + * variables. If the search reaches an unmarked decision variable or a + * variable assigned below the minimum level of variables in the first uip + * learned clause or a level on which no variable has been marked, then + * the variable from which the DFS is started is not redundant. Otherwise + * the start variable is redundant and will eventually be removed from the + * learned clause in step 4. We initially implemented BFS, but then + * profiling revelead that this step is a bottle neck for certain + * incremental applications. After switching to DFS this hot spot went + * away. + */ + orig = mhead - marked; + for (i = 0; i < orig; i++) + { + start = marked[i]; + + assert (start->mark); + assert (start != uip); + assert (start->level < level); + + if (!start->reason) + continue; + + old = mhead - marked; + assert (dhead == dfs); + push (start); + + while (dhead > dfs) + { + u = pop (); + assert (u->mark); + + c = var2reason (u); +#ifdef NO_BINARY_CLAUSES + if (c == &impl) + resetimpl (); +#endif + if (!c || + ((l = u->level) && + (l < minlevel || ((hashlevel (l) & ~siglevels))))) + { + while (mhead > marked + old) /* reset all marked */ + (*--mhead)->mark = 0; + + dhead = dfs; /* and DFS stack */ + break; + } + + eol = end_of_lits (c); + for (p = c->lits; p < eol; p++) + { + v = LIT2VAR (*p); + if (v->mark) + continue; + + mark_var (v); + push (v); + } + } + } + + for (m = marked; m < mhead; m++) + { + v = *m; + + assert (v->mark); + assert (!v->resolved); + + use_var (v); + + c = var2reason (v); + if (!c) + continue; + +#ifdef NO_BINARY_CLAUSES + if (c == &impl) + resetimpl (); +#endif + eol = end_of_lits (c); + for (p = c->lits; p < eol; p++) + { + other = *p; + + u = LIT2VAR (other); + if (!u->level) + continue; + + if (!u->mark) /* 'MARKTEST' */ + break; + } + + if (p != eol) + continue; + + add_antecedent (c); + v->resolved = 1; + } + + for (m = marked; m < mhead; m++) + { + v = *m; + + assert (v->mark); + v->mark = 0; + + if (v->resolved) + { + v->resolved = 0; + continue; + } + + this = VAR2LIT (v); + if (this->val == TRUE) + this++; /* actually NOTLIT */ + + add_lit (this); + minimizedllits++; + } + + assert (ahead <= eoa); + assert (rhead <= eor); + + mhead = marked; +} + +static void +fanalyze (void) +{ + Lit ** eol, ** p, * lit; + Cls * cls, * reason; + Var * v, * u; + int next; + + double start = picosat_time_stamp (); + + assert (failed_assumption); + assert (failed_assumption->val == FALSE); + + v = LIT2VAR (failed_assumption); + reason = var2reason (v); + if (!reason) return; +#ifdef NO_BINARY_CLAUSES + if (reason == &impl) + resetimpl (); +#endif + + eol = end_of_lits (reason); + for (p = reason->lits; p != eol; p++) + { + lit = *p; + u = LIT2VAR (lit); + if (u == v) continue; + if (u->reason) break; + } + if (p == eol) return; + + assert (ahead == added); + assert (mhead == marked); + assert (rhead == resolved); + + next = 0; + mark_var (v); + add_lit (NOTLIT (failed_assumption)); + + do + { + v = marked[next++]; + use_var (v); + if (v->reason) + { + reason = var2reason (v); +#ifdef NO_BINARY_CLAUSES + if (reason == &impl) + resetimpl (); +#endif + add_antecedent (reason); + eol = end_of_lits (reason); + for (p = reason->lits; p != eol; p++) + { + lit = *p; + u = LIT2VAR (lit); + if (u == v) continue; + if (u->mark) continue; + mark_var (u); + } + } + else + { + lit = VAR2LIT (v); + if (lit->val == TRUE) lit = NOTLIT (lit); + add_lit (lit); + } + } + while (marked + next < mhead); + + cls = add_simplified_clause (1); + v = LIT2VAR (failed_assumption); + reason = var2reason (v); +#ifdef NO_BINARY_CLAUSES + if (reason == &impl) + resetimpl (); + else +#endif + { + assert (reason->locked); + reason->locked = 0; + } + if (reason->learned && reason->size > 2) + { + assert (llocked > 0); + llocked--; + } + v->reason = cls; + assert (cls->learned); + assert (!cls->locked); + cls->locked = 1; + if (cls->size > 2) + { + llocked++; + assert (llocked > 0); + } + + while (mhead > marked) + (*--mhead)->mark = 0; + + if (verbosity) + fprintf (out, "%sfanalyze took %.1f seconds\n", + prefix, picosat_time_stamp () - start); +} + +/* Propagate assignment of 'this' to 'FALSE' by visiting all binary clauses in + * which 'this' occurs. + */ +inline static void +prop2 (Lit * this) +{ +#ifdef NO_BINARY_CLAUSES + Lit ** l, ** start; + Ltk * lstk; +#else + Cls * cls, ** p; + Cls * next; +#endif + Lit * other; + Val tmp; + + assert (this->val == FALSE); + +#ifdef NO_BINARY_CLAUSES + lstk = LIT2IMPLS (this); + start = lstk->start; + l = start + lstk->count; + while (l != start) + { +#ifdef STATS + /* The counter 'visits' is the number of clauses that are + * visited during propagations of assignments. + */ + visits++; + bvisits++; +#endif + other = *--l; + tmp = other->val; + + if (tmp == TRUE) + { +#ifdef STATS + othertrue++; + othertrue2++; + if (LIT2VAR (other)->level < level) + othertrue2u++; +#endif + continue; + } + + if (tmp != FALSE) + { + assign_forced (other, LIT2REASON (NOTLIT(this))); + continue; + } + + if (conflict == &cimpl) + resetcimpl (); + conflict = setcimpl (this, other); + } +#else + /* Traverse all binary clauses with 'this'. Head/Tail pointers for binary + * clauses do not have to be modified here. + */ + p = LIT2IMPLS (this); + for (cls = *p; cls; cls = next) + { +#ifdef STATS + visits++; + bvisits++; +#endif + assert (!cls->collect); +#ifdef TRACE + assert (!cls->collected); +#endif + assert (cls->size == 2); + + other = cls->lits[0]; + if (other == this) + { + next = cls->next[0]; + other = cls->lits[1]; +#ifdef STATS +#endif + } + else + next = cls->next[1]; + + tmp = other->val; + + if (tmp == TRUE) + { +#ifdef STATS + othertrue++; + othertrue2++; + if (LIT2VAR (other)->level < level) + othertrue2u++; +#endif + continue; + } + + if (tmp == FALSE) + conflict = cls; + else + assign_forced (other, cls); /* unit clause */ + } +#endif /* !defined(NO_BINARY_CLAUSES) */ +} + +#ifndef NDSC +static int +should_disconnect_head_tail (Lit * lit) +{ + unsigned lit_level; + Var * v; + + assert (lit->val == TRUE); + + v = LIT2VAR (lit); + lit_level = v->level; + + if (!lit_level) + return 1; + +#ifndef NFL + if (simplifying) + return 0; +#endif + + return lit_level < level; +} +#endif + +inline static void +propl (Lit * this) +{ + Lit **l, *other, *prev, *new_lit, **eol; + Cls *next, **htp_ptr, **new_htp_ptr; + Cls *cls; +#ifdef STATS + unsigned size; +#endif + + htp_ptr = LIT2HTPS (this); + assert (this->val == FALSE); + + /* Traverse all non binary clauses with 'this'. Head/Tail pointers are + * updated as well. + */ + for (cls = *htp_ptr; cls; cls = next) + { +#ifdef STATS + visits++; + size = cls->size; + if (size == 2) + bvisits++; + else if (size >= 3) + { + traversals++; /* other is dereferenced at least */ + + if (size == 3) + tvisits++; + else if (size >= 4) + { + lvisits++; + ltraversals++; + } + } +#endif +#ifdef TRACE + assert (!cls->collected); +#endif + assert (cls->size > 0); + + /* With assumptions we need to traverse unit clauses as well. + */ + if (cls->size == 1) + { + assert (!conflict); + conflict = cls; + break; + } + + other = cls->lits[0]; + if (other != this) + { + cls->lits[0] = this; + cls->lits[1] = other; + next = cls->next[1]; + cls->next[1] = cls->next[0]; + cls->next[0] = next; + } + else + { + other = cls->lits[1]; + next = cls->next[0]; + } + assert (other == cls->lits[1]); + assert (this == cls->lits[0]); + assert (next == cls->next[0]); + assert (!cls->collect); + + if (other->val == TRUE) + { +#ifdef STATS + othertrue++; + othertruel++; +#endif +#ifndef NDSC + if (should_disconnect_head_tail (other)) + { + new_htp_ptr = LIT2DHTPS (other); + cls->next[0] = *new_htp_ptr; + *new_htp_ptr = cls; +#ifdef STATS + othertruelu++; +#endif + *htp_ptr = next; + continue; + } +#endif + htp_ptr = cls->next; + continue; + } + + l = cls->lits + 1; + eol = cls->lits + cls->size; + prev = this; + + while (++l != eol) + { +#ifdef STATS + if (size >= 3) + { + traversals++; + if (size > 3) + ltraversals++; + } +#endif + new_lit = *l; + *l = prev; + prev = new_lit; + if (new_lit->val != FALSE) break; + } + + if (l == eol) + { + while (l > cls->lits + 2) + { + new_lit = *--l; + *l = prev; + prev = new_lit; + } + assert (cls->lits[0] == this); + + assert (other == cls->lits[1]); + if (other->val == FALSE) /* found conflict */ + { + assert (!conflict); + conflict = cls; + return; + } + + assign_forced (other, cls); /* unit clause */ + htp_ptr = cls->next; + } + else + { + assert (new_lit->val == TRUE || new_lit->val == UNDEF); + cls->lits[0] = new_lit; + // *l = this; + new_htp_ptr = LIT2HTPS (new_lit); + cls->next[0] = *new_htp_ptr; + *new_htp_ptr = cls; + *htp_ptr = next; + } + } +} + +#ifndef NADC + +static unsigned primes[] = { 996293, 330643, 753947, 500873 }; + +#define PRIMES ((sizeof primes)/sizeof *primes) + +static unsigned +hash_ado (Lit ** ado, unsigned salt) +{ + unsigned i, res, tmp; + Lit ** p, * lit; + + assert (salt < PRIMES); + + i = salt; + res = 0; + + for (p = ado; (lit = *p); p++) + { + assert (lit->val); + + tmp = res >> 31; + res <<= 1; + + if (lit->val > 0) + res |= 1; + + assert (i < PRIMES); + res *= primes[i++]; + if (i == PRIMES) + i = 0; + + res += tmp; + } + + return res & (szadotab - 1); +} + +static unsigned +cmp_ado (Lit ** a, Lit ** b) +{ + Lit ** p, ** q, * l, * k; + int res; + + for (p = a, q = b; (l = *p); p++, q++) + { + k = *q; + assert (k); + if ((res = (l->val - k->val))) + return res; + } + + assert (!*q); + + return 0; +} + +static Lit *** +find_ado (Lit ** ado) +{ + Lit *** res, ** other; + unsigned pos, delta; + + pos = hash_ado (ado, 0); + assert (pos < szadotab); + res = adotab + pos; + + other = *res; + if (!other || !cmp_ado (other, ado)) + return res; + + delta = hash_ado (ado, 1); + if (!(delta & 1)) + delta++; + + assert (delta & 1); + assert (delta < szadotab); + + for (;;) + { + pos += delta; + if (pos >= szadotab) + pos -= szadotab; + + assert (pos < szadotab); + res = adotab + pos; + other = *res; + if (!other || !cmp_ado (other, ado)) + return res; + } +} + +static void +enlarge_adotab (void) +{ + /* TODO make this generic */ + + ABORTIF (szadotab, + "internal: all different objects table needs larger initial size"); + assert (!nadotab); + szadotab = 10000; + NEWN (adotab, szadotab); + CLRN (adotab, szadotab); +} + +static int +propado (Var * v) +{ + Lit ** p, ** q, *** adotabpos, **ado, * lit; + Var * u; + + if (level && adodisabled) + return 1; + + assert (!conflict); + assert (!adoconflict); + assert (VAR2LIT (v)->val != UNDEF); + assert (!v->adotabpos); + + if (!v->ado) + return 1; + + assert (v->inado); + + for (p = v->ado; (lit = *p); p++) + if (lit->val == UNDEF) + { + u = LIT2VAR (lit); + assert (!u->ado); + u->ado = v->ado; + v->ado = 0; + + return 1; + } + + if (4 * nadotab >= 3 * szadotab) /* at least 75% filled */ + enlarge_adotab (); + + adotabpos = find_ado (v->ado); + ado = *adotabpos; + + if (!ado) + { + nadotab++; + v->adotabpos = adotabpos; + *adotabpos = v->ado; + return 1; + } + + assert (ado != v->ado); + + adoconflict = new_clause (2 * llength (ado), 1); + q = adoconflict->lits; + + for (p = ado; (lit = *p); p++) + *q++ = lit->val == FALSE ? lit : NOTLIT (lit); + + for (p = v->ado; (lit = *p); p++) + *q++ = lit->val == FALSE ? lit : NOTLIT (lit); + + assert (q == ENDOFCLS (adoconflict)); + conflict = adoconflict; + adoconflicts++; + return 0; +} + +#endif + +static void +bcp (void) +{ + int props = 0; + assert (!conflict); + + if (mtcls || conflict) + return; + + for (;;) + { + if (ttail2 < thead) /* prioritize implications */ + { + props++; + prop2 (NOTLIT (*ttail2++)); + } + else if (ttail < thead) /* unit clauses or clauses with length > 2 */ + { + if (conflict) break; + propl (NOTLIT (*ttail++)); + if (conflict) break; + } +#ifndef NADC + else if (ttailado < thead) + { + if (conflict) break; + propado (LIT2VAR (*ttailado++)); + if (conflict) break; + } +#endif + else + break; /* all assignments propagated, so break */ + } + + propagations += props; +} + +/* This version of 'drive' is independent of the global variable 'level' and + * thus even works if we resolve ala 'relsat' without driving an assignment. + */ +static unsigned +drive (void) +{ + Var *v, *first, *second; + Lit **p; + + first = 0; + for (p = added; p < ahead; p++) + { + v = LIT2VAR (*p); + if (!first || v->level > first->level) + first = v; + } + + if (!first) + return 0; + + second = 0; + for (p = added; p < ahead; p++) + { + v = LIT2VAR (*p); + + if (v->level == first->level) + continue; + + if (!second || v->level > second->level) + second = v; + } + + if (!second) + return 0; + + return second->level; +} + +#ifdef VISCORES + +static void +viscores (void) +{ + Rnk *p, *eor = rnks + max_var; + char name[100], cmd[200]; + FILE * data; + Flt s; + int i; + + for (p = rnks + 1; p <= eor; p++) + { + s = p->score; + if (s == INFFLT) + continue; + s = mulflt (s, nvinc); + assert (flt2double (s) <= 1.0); + } + + sprintf (name, "/tmp/picosat-viscores/data/%08u", conflicts); + sprintf (cmd, "sort -n|nl>%s", name); + + data = popen (cmd, "w"); + for (p = rnks + 1; p <= eor; p++) + { + s = p->score; + if (s == INFFLT) + continue; + s = mulflt (s, nvinc); + fprintf (data, "%lf %d\n", 100.0 * flt2double (s), (int)(p - rnks)); + } + fflush (data); + pclose (data); + + for (i = 0; i < 8; i++) + { + sprintf (cmd, "awk '$3%%8==%d' %s>%s.%d", i, name, name, i); + system (cmd); + } + + fprintf (fviscores, "set title \"%u\"\n", conflicts); + fprintf (fviscores, "plot [0:%u] 0, 100 * (1 - 1/1.1), 100", max_var); + + for (i = 0; i < 8; i++) + fprintf (fviscores, + ", \"%s.%d\" using 1:2:3 with labels tc lt %d", + name, i, i + 1); + + fputc ('\n', fviscores); + fflush (fviscores); +#ifndef WRITEGIF + usleep (50000); /* refresh rate of 20 Hz */ +#endif +} + +#endif + +static void +crescore (void) +{ + Cls **p, *cls; + Act *a; + Flt factor; + int l = log2flt (cinc); + assert (l > 0); + factor = base2flt (1, -l); + + for (p = lclauses; p != lhead; p++) + { + cls = *p; + + if (!cls) + continue; + +#ifdef TRACE + if (cls->collected) + continue; +#endif + assert (cls->learned); + + if (cls->size <= 2) + continue; + + a = CLS2ACT (cls); + *a = mulflt (*a, factor); + } + + cinc = mulflt (cinc, factor); +} + +static void +inc_vinc (void) +{ +#ifdef VISCORES + nvinc = mulflt (nvinc, fvinc); +#endif + vinc = mulflt (vinc, ifvinc); +} + +inline static void +inc_max_var (void) +{ + Lit *lit; + Rnk *r; + Var *v; + + assert (max_var < size_vars); + + max_var++; /* new index of variable */ + assert (max_var); /* no unsigned overflow */ + + if (max_var == size_vars) + enlarge (size_vars + (size_vars + 3) / 4); /* increase by 25% */ + + assert (max_var < size_vars); + + lit = lits + 2 * max_var; + lit[0].val = lit[1].val = UNDEF; + + memset (htps + 2 * max_var, 0, 2 * sizeof *htps); +#ifndef NDSC + memset (dhtps + 2 * max_var, 0, 2 * sizeof *dhtps); +#endif + memset (impls + 2 * max_var, 0, 2 * sizeof *impls); + memset (jwh + 2 * max_var, 0, 2 * sizeof *jwh); + + v = vars + max_var; /* initialize variable components */ + CLR (v); + + r = rnks + max_var; /* initialize rank */ + CLR (r); + + hpush (r); +} + +static void +force (Cls * cls) +{ + Lit ** p, ** eol, * lit, * forced; + Cls * reason; + Var *v; + + forced = 0; + reason = cls; + + eol = end_of_lits (cls); + for (p = cls->lits; p < eol; p++) + { + lit = *p; + if (lit->val == UNDEF) + { + assert (!forced); + forced = lit; +#ifdef NO_BINARY_CLAUSES + if (cls == &impl) + reason = LIT2REASON (NOTLIT (p[p == cls->lits ? 1 : -1])); +#endif + } + else + assert (lit->val == FALSE); + } + +#ifdef NO_BINARY_CLAUSES + if (cls == &impl) + resetimpl (); +#endif + if (!forced) + return; + + assign_forced (forced, reason); + v = LIT2VAR (forced); +} + +static void +inc_lreduce (void) +{ +#ifdef STATS + inclreduces++; +#endif + lreduce *= FREDUCE; + lreduce /= 100; + report (1, '+'); +} + +static void +backtrack (void) +{ + unsigned new_level; + Cls * cls; + + conflicts++; + LOG (fprintf (out, "%sconflict ", prefix); dumpclsnl (conflict)); + + analyze (); + new_level = drive (); + // TODO: why not? assert (new_level != 1 || (ahead - added) == 2); + cls = add_simplified_clause (1); + undo (new_level); + force (cls); + + if ( +#ifndef NFL + !simplifying && +#endif + !--lreduceadjustcnt) + { + lreduceadjustinc *= 15; + lreduceadjustinc /= 10; + lreduceadjustcnt = lreduceadjustinc; + inc_lreduce (); + } + + if (verbosity >= 4 && !(conflicts % 1000)) + report (4, 'C'); +} + +static void +inc_cinc (void) +{ + cinc = mulflt (cinc, fcinc); + if (lcinc < cinc) + crescore (); +} + +static void +incincs (void) +{ + inc_vinc (); + inc_cinc (); +#ifdef VISCORES + viscores (); +#endif +} + +static void +disconnect_clause (Cls * cls) +{ + assert (cls->connected); + + if (cls->size > 2) + { + if (cls->learned) + { + assert (nlclauses > 0); + nlclauses--; + + assert (llits >= cls->size); + llits -= cls->size; + } + else + { + assert (noclauses > 0); + noclauses--; + + assert (olits >= cls->size); + olits -= cls->size; + } + } + +#ifndef NDEBUG + cls->connected = 0; +#endif +} + +static int +clause_is_toplevel_satisfied (Cls * cls) +{ + Lit *lit, **p, **eol = end_of_lits (cls); + Var *v; + + for (p = cls->lits; p < eol; p++) + { + lit = *p; + if (lit->val == TRUE) + { + v = LIT2VAR (lit); + if (!v->level) + return 1; + } + } + + return 0; +} + +static int +collect_clause (Cls * cls) +{ + assert (cls->collect); + cls->collect = 0; + +#ifdef TRACE + assert (!cls->collected); + cls->collected = 1; +#endif + disconnect_clause (cls); + +#ifdef TRACE + if (trace && (!cls->learned || cls->used)) + return 0; +#endif + delete_clause (cls); + + return 1; +} + +static size_t +collect_clauses (void) +{ + Cls *cls, **p, **q, * next; + Lit * lit, * eol; + size_t res; + Var * v; + int i; + + res = current_bytes; + + eol = lits + 2 * max_var + 1; + for (lit = lits + 2; lit <= eol; lit++) + { + for (i = 0; i <= 1; i++) + { + if (i) + { +#ifdef NO_BINARY_CLAUSES + Ltk * lstk = LIT2IMPLS (lit); + Lit ** r, ** s; + r = lstk->start; + for (s = r; s < lstk->start + lstk->count; s++) + { + Lit * other = *s; + Var *v = LIT2VAR (other); + if (v->level || other->val != TRUE) + *r++ = other; + } + lstk->count = r - lstk->start; + continue; +#else + p = LIT2IMPLS (lit); +#endif + } + else + p = LIT2HTPS (lit); + + for (cls = *p; cls; cls = next) + { + q = cls->next; + if (cls->lits[0] != lit) + q++; + + next = *q; + if (cls->collect) + *p = next; + else + p = q; + } + } + } + +#ifndef NDSC + for (lit = lits + 2; lit <= eol; lit++) + { + p = LIT2DHTPS (lit); + while ((cls = *p)) + { + Lit * other = cls->lits[0]; + if (other == lit) + { + q = cls->next + 1; + } + else + { + assert (cls->lits[1] == lit); + q = cls->next; + } + + if (cls->collect) + *p = *q; + else + p = q; + } + } +#endif + + for (v = vars + 1; v <= vars + max_var; v++) + { + cls = v->reason; + if (!cls) + continue; + +#ifdef NO_BINARY_CLAUSES + if (ISLITREASON (cls)) + continue; +#endif + if (cls->collect) + v->reason = 0; + } + + for (p = SOC; p != EOC; p = NXC (p)) + { + cls = *p; + + if (!cls) + continue; + + if (!cls->collect) + continue; + + if (collect_clause (cls)) + *p = 0; + } + +#ifdef TRACE + if (!trace) +#endif + { + q = oclauses; + for (p = q; p < ohead; p++) + if ((cls = *p)) + *q++ = cls; + ohead = q; + + q = lclauses; + for (p = q; p < lhead; p++) + if ((cls = *p)) + *q++ = cls; + lhead = q; + } + + assert (current_bytes <= res); + res -= current_bytes; + recycled += res; + + LOG (fprintf (out, "%scollected %ld bytes\n", prefix, res)); + + return res; +} + +static int +need_to_reduce (void) +{ + return nlclauses >= reduce_limit_on_lclauses (); +} + +#ifdef NLUBY + +static void +inc_drestart (void) +{ + drestart *= FRESTART; + drestart /= 100; + + if (drestart >= MAXRESTART) + drestart = MAXRESTART; +} + +static void +inc_ddrestart (void) +{ + ddrestart *= FRESTART; + ddrestart /= 100; + + if (ddrestart >= MAXRESTART) + ddrestart = MAXRESTART; +} + +#else + +static int +luby (int i) +{ + int k; + for (k = 1; k < 32; k++) + if (i == (1 << k) - 1) + return 1 << (k - 1); + + for (k = 1;; k++) + if ((1 << (k - 1)) <= i && i < (1 << k) - 1) + return luby (i - (1 << (k-1)) + 1); +} + +#endif + +#ifndef NLUBY +static void +inc_lrestart (int skip) +{ + unsigned delta; + + delta = 100 * luby (++lubycnt); + lrestart = conflicts + delta; + + if (waslubymaxdelta) + report (1, skip ? 'N' : 'R'); + else + report (2, skip ? 'n' : 'r'); + + if (delta > lubymaxdelta) + { + lubymaxdelta = delta; + waslubymaxdelta = 1; + } + else + waslubymaxdelta = 0; +} +#endif + +static void +init_restart (void) +{ +#ifdef NLUBY + /* TODO: why is it better in incremental usage to have smaller initial + * outer restart interval? + */ + ddrestart = calls > 1 ? MINRESTART : 1000; + drestart = MINRESTART; + lrestart = conflicts + drestart; +#else + lubycnt = 0; + lubymaxdelta = 0; + waslubymaxdelta = 0; + inc_lrestart (0); +#endif +} + +static void +restart (void) +{ + int skip; +#ifdef NLUBY + char kind; + int outer; + + inc_drestart (); + outer = (drestart >= ddrestart); + + if (outer) + skip = very_high_agility (); + else + skip = high_agility (); +#else + skip = medium_agility (); +#endif + +#ifdef STATS + if (skip) + skippedrestarts++; +#endif + + assert (conflicts >= lrestart); + + if (!skip) + { + restarts++; + assert (level > 1); + LOG (fprintf (out, "%srestart %u\n", prefix, restarts)); + undo (0); + } + +#ifdef NLUBY + if (outer) + { + kind = skip ? 'N' : 'R'; + inc_ddrestart (); + drestart = MINRESTART; + } + else if (skip) + { + kind = 'n'; + } + else + { + kind = 'r'; + } + + assert (drestart <= MAXRESTART); + lrestart = conflicts + drestart; + assert (lrestart > conflicts); + + report (outer ? 1 : 2, kind); +#else + inc_lrestart (skip); +#endif +} + +inline static void +assign_decision (Lit * lit) +{ + assert (!conflict); + + level++; + + LOG (fprintf (out, "%snew level %u\n", prefix, level)); + LOG (fprintf (out, + "%sassign %d at level %d <= DECISION\n", + prefix, lit2int (lit), level)); + + assign (lit, 0); +} + +#ifndef NFL + +static int +lit_has_binary_clauses (Lit * lit) +{ +#ifdef NO_BINARY_CLAUSES + Ltk* lstk = LIT2IMPLS (lit); + return lstk->count != 0; +#else + return *LIT2IMPLS (lit) != 0; +#endif +} + +static void +flbcp (void) +{ +#ifdef STATS + unsigned long long propagaions_before_bcp = propagations; +#endif + bcp (); +#ifdef STATS + flprops += propagations - propagaions_before_bcp; +#endif +} + +inline static int +cmp_inverse_rnk (Rnk * a, Rnk * b) +{ + return -cmp_rnk (a, b); +} + +inline static Flt +rnk2jwh (Rnk * r) +{ + Flt res, sum, pjwh, njwh; + Lit * plit, * nlit; + + plit = RNK2LIT (r); + nlit = plit + 1; + + pjwh = *LIT2JWH (plit); + njwh = *LIT2JWH (nlit); + + res = mulflt (pjwh, njwh); + + sum = addflt (pjwh, njwh); + sum = mulflt (sum, base2flt (1, -10)); + res = addflt (res, sum); + + return res; +} + +static int +cmp_inverse_jwh_rnk (Rnk * r, Rnk * s) +{ + Flt a = rnk2jwh (r); + Flt b = rnk2jwh (s); + int res = cmpflt (a, b); + + if (res) + return -res; + + return cmp_inverse_rnk (r, s); +} + +static void +faillits (void) +{ + unsigned i, j, old_trail_count, common, saved_count; + unsigned new_saved_size, oldladded = ladded; + unsigned long long limit, delta; + Lit * lit, * other, * pivot; + int new_trail_count; + Rnk * r, ** p, ** q; + Var * v; + + if (heap + 1 >= hhead) + return; + + if (propagations < fllimit) + return; + + flcalls++; +#ifdef STATSA + flrounds++; +#endif + delta = propagations/10; + if (delta >= 100*1000*1000) delta = 100*1000*1000; + else if (delta <= 100*1000) delta = 100*1000; + + limit = propagations + delta; + fllimit = propagations; + + assert (!level); + assert (simplifying); + + if (flcalls <= 1) + sort (Rnk *, cmp_inverse_jwh_rnk, heap + 1, hhead - (heap + 1)); + else + sort (Rnk *, cmp_inverse_rnk, heap + 1, hhead - (heap + 1)); + + i = 1; /* NOTE: heap starts at position '1' */ + + while (propagations < limit) + { + if (heap + i == hhead) + { + if (ladded == oldladded) + break; + + i = 1; +#ifdef STATS + flrounds++; +#endif + oldladded = ladded; + } + + assert (heap + i < hhead); + + r = heap[i++]; + lit = RNK2LIT (r); + + if (lit->val) + continue; + + if (!lit_has_binary_clauses (NOTLIT (lit))) + { +#ifdef STATS + flskipped++; +#endif + continue; + } + +#ifdef STATS + fltried++; +#endif + LOG (fprintf (out, "%strying %d as failed literal\n", + prefix, lit2int (lit))); + + assign_decision (lit); + old_trail_count = thead - trail; + flbcp (); + + if (conflict) + { +EXPLICITLY_FAILED_LITERAL: + LOG (fprintf (out, "%sfound explicitly failed literal %d\n", + prefix, lit2int (lit))); + + failedlits++; + efailedlits++; + + backtrack (); + flbcp (); + + if (!conflict) + continue; + +CONTRADICTION: + assert (!level); + backtrack (); + assert (mtcls); + + goto RETURN; + } + + if (propagations >= limit) + { + undo (0); + break; + } + + lit = NOTLIT (lit); + + if (!lit_has_binary_clauses (NOTLIT (lit))) + { +#ifdef STATS + flskipped++; +#endif + undo (0); + continue; + } + +#ifdef STATS + fltried++; +#endif + LOG (fprintf (out, "%strying %d as failed literals\n", + prefix, lit2int (lit))); + + new_trail_count = thead - trail; + saved_count = new_trail_count - old_trail_count; + + if (saved_count > saved_size) + { + new_saved_size = saved_size ? 2 * saved_size : 1; + while (saved_count > new_saved_size) + new_saved_size *= 2; + + RESIZEN (saved, saved_size, new_saved_size); + saved_size = new_saved_size; + } + + for (j = 0; j < saved_count; j++) + { + other = trail[old_trail_count + j]; + saved[j] = trail[old_trail_count + j]; + } + + undo (0); + + assign_decision (lit); + flbcp (); + + if (conflict) + goto EXPLICITLY_FAILED_LITERAL; + + pivot = (thead - trail <= new_trail_count) ? lit : NOTLIT (lit); + + common = 0; + for (j = 0; j < saved_count; j++) + if ((other = saved[j])->val == TRUE) + saved[common++] = other; + + undo (0); + + LOG (if (common) + fprintf (out, + "%sfound %d literals implied by %d and %d\n", + prefix, common, + lit2int (NOTLIT (lit)), lit2int (lit))); + + for (j = 0; + j < common + /* TODO: For some Velev benchmarks, extracting the common implicit + * failed literals took quite some time. This needs to be fixed by + * a dedicated analyzer. Up to then we bound the number of + * propagations in this loop as well. + */ + && propagations < limit + delta + ; j++) + { + other = saved[j]; + + if (other->val == TRUE) + continue; + + assert (!other->val); + + LOG (fprintf (out, + "%sforcing %d as forced implicitly failed literal\n", + prefix, lit2int (other))); + + assert (pivot != NOTLIT (other)); + assert (pivot != other); + + assign_decision (NOTLIT (other)); + flbcp (); + + assert (level == 1); + + if (conflict) + { + backtrack (); + assert (!level); + } + else + { + assign_decision (pivot); + flbcp (); + + backtrack (); + + if (level) + { + assert (level == 1); + + flbcp (); + + if (conflict) + { + backtrack (); + assert (!level); + } + else + { + assign_decision (NOTLIT (pivot)); + flbcp (); + backtrack (); + + if (level) + { + assert (level == 1); + flbcp (); + + if (!conflict) + { +#ifdef STATS + floopsed++; +#endif + undo (0); + continue; + } + + backtrack (); + } + + assert (!level); + } + + assert (!level); + } + } + assert (!level); + flbcp (); + + failedlits++; + ifailedlits++; + + if (conflict) + goto CONTRADICTION; + } + } + + fllimit += 9 * (propagations - fllimit); /* 10% for failed literals */ + +RETURN: + + /* First flush top level assigned literals. Those are prohibited from + * being pushed up the heap during 'faillits' since 'simplifying' is set. + */ + assert (heap < hhead); + for (p = q = heap + 1; p < hhead; p++) + { + r = *p; + v = vars + (r - rnks); + lit = RNK2LIT (r); + if (lit->val) + r->pos = 0; + else + *q++ = r; + } + + /* Then resort with respect to EVSIDS score and fix positions. + */ + sort (Rnk *, cmp_inverse_rnk, heap + 1, hhead - (heap + 1)); + for (p = heap + 1; p < hhead; p++) + (*p)->pos = p - heap; +} + +#endif + +static void +simplify (void) +{ + unsigned collect, delta; + size_t bytes_collected; + Cls **p, *cls; + + assert (!mtcls); + assert (!satisfied ()); + assert (lsimplify <= propagations); + assert (fsimplify <= fixed); + +#ifndef NFL + if (level) + undo (0); + + simplifying = 1; + faillits (); + simplifying = 0; + + if (mtcls) + return; +#endif + + collect = 0; + for (p = SOC; p != EOC; p = NXC (p)) + { + cls = *p; + if (!cls) + continue; + +#ifdef TRACE + if (cls->collected) + continue; +#endif + + if (cls->locked) + continue; + + assert (!cls->collect); + if (clause_is_toplevel_satisfied (cls)) + { + mark_clause_to_be_collected (cls); + collect++; + } + } + + if (collect) + { + bytes_collected = collect_clauses (); +#ifdef STATS + srecycled += bytes_collected; +#endif + } + + delta = 10 * (olits + llits) + 100000; + if (delta > 2000000) + delta = 2000000; + lsimplify = propagations + delta; + fsimplify = fixed; + simps++; + + report (1, 's'); +} + +static void +iteration (void) +{ + assert (!level); + assert (bcp_queue_is_empty ()); + assert (isimplify < fixed); + + iterations++; + report (2, 'i'); +#ifdef NLUBY + drestart = MINRESTART; + lrestart = conflicts + drestart; +#else + init_restart (); +#endif + isimplify = fixed; +} + +static int +cmp_activity (Cls * c, Cls * d) +{ + Act a; + Act b; + + assert (c->learned); + assert (d->learned); + + a = *CLS2ACT (c); + b = *CLS2ACT (d); + + if (a < b) + return -1; + + if (b < a) + return 1; + + /* Prefer shorter clauses. + */ + if (c->size < d->size) + return 1; + + if (c->size > d->size) + return -1; + + return 0; +} + +static void +reduce (unsigned percentage) +{ + unsigned rcount, lcollect, collect, target, ld; + size_t bytes_collected; + Cls **p, *cls; + Act minact; + + lastreduceconflicts = conflicts; + + assert (percentage <= 100); + LOG (fprintf (out, + "%sreducing %u%% learned clauses\n", + prefix, percentage)); + + while (nlclauses - llocked > (unsigned)(eor - resolved)) + ENLARGE (resolved, rhead, eor); + + collect = 0; + lcollect = 0; + + for (p = ((fsimplify < fixed) ? SOC : lclauses); p != EOC; p = NXC (p)) + { + cls = *p; + if (!cls) + continue; + +#ifdef TRACE + if (cls->collected) + continue; +#endif + + if (cls->locked) + continue; + + assert (!cls->collect); + if (fsimplify < fixed && clause_is_toplevel_satisfied (cls)) + { + mark_clause_to_be_collected (cls); + collect++; + + if (cls->learned && cls->size > 2) + lcollect++; + + continue; + } + + if (cls->fixed) + continue; + + if (!cls->learned) + continue; + + if (cls->size <= 2) + continue; + + assert (rhead < eor); + *rhead++ = cls; + } + assert (rhead <= eor); + + fsimplify = fixed; + + rcount = rhead - resolved; + sort (Cls *, cmp_activity, resolved, rcount); + + assert (nlclauses >= lcollect); + target = nlclauses - lcollect + 1; + + for (ld = 1; ld < 32 && ((unsigned) (1 << ld)) < target; ld++) + ; + minact = mulflt (cinc, base2flt (1, -ld)); + + target = (percentage * target + 99) / 100; + + if (target >= rcount) + { + target = rcount; + } + else if (*CLS2ACT (resolved[target]) < minact) + { + /* If the distribution of clause activities is skewed and the median + * is actually below the maximum average activity, then we collect all + * clauses below this activity. + */ + while (++target < rcount && *CLS2ACT (resolved[target]) < minact) + ; + } + else + { + while (target > 0 && + !cmp_activity (resolved[target - 1], resolved[target])) + target--; + } + + rhead = resolved + target; + while (rhead > resolved) + { + cls = *--rhead; + mark_clause_to_be_collected (cls); + + collect++; + if (cls->learned && cls->size > 2) /* just for consistency */ + lcollect++; + } + + if (collect) + { + reductions++; + bytes_collected = collect_clauses (); +#ifdef STATS + rrecycled += bytes_collected; +#endif + report (2, '-'); + } + + if (!lcollect) + inc_lreduce (); /* avoid dead lock */ + + assert (rhead == resolved); +} + +static void +init_reduce (void) +{ + lreduce = loadded / 2; + + if (lreduce < 100) + lreduce = 100; + +#if 0 + if (lreduce > 10000) + lreduce = 10000; +#endif + + if (verbosity) + fprintf (out, + "%s\n%sinitial reduction limit %u clauses\n%s\n", + prefix, prefix, lreduce, prefix); +} + +static unsigned +rng (void) +{ + unsigned res = srng; + srng *= 1664525u; + srng += 1013904223u; + NOLOG (fprintf (out, "%srng () = %u\n", prefix, res)); + return res; +} + +static unsigned +rrng (unsigned low, unsigned high) +{ + unsigned long long tmp; + unsigned res, elements; + assert (low <= high); + elements = high - low + 1; + tmp = rng (); + tmp *= elements; + tmp >>= 32; + tmp += low; + res = tmp; + NOLOG (fprintf (out, "%srrng (%u, %u) = %u\n", prefix, low, high, res)); + assert (low <= res); + assert (res <= high); + return res; +} + +static Lit * +decide_phase (Lit * lit) +{ + Lit * not_lit = NOTLIT (lit); + Var *v = LIT2VAR (lit); + + assert (LIT2SGN (lit) > 0); + if (!v->assigned) + { +#ifdef STATS + staticphasedecisions++; +#endif + if (defaultphase == 1) + { + /* assign to TRUE */ + } + else if (defaultphase == 0) + { + /* assign to FALSE */ + lit = not_lit; + } + else if (defaultphase == 3) + { + /* randomly assign default phase */ + if (rrng (1, 2) != 2) + lit = not_lit; + } + else if (*LIT2JWH(lit) <= *LIT2JWH (not_lit)) + { + /* assign to FALSE (Jeroslow-Wang says there are more short + * clauses with negative occurence of this variable, so satisfy + * those, to minimize BCP) + */ + lit = not_lit; + } + else + { + /* assign to TRUE (... but strictly more positive occurrences) */ + } + } + else + { + /* repeat last phase: phase saving heuristic */ + + if (v->phase) + { + /* assign to TRUE (last phase was TRUE as well) */ + } + else + { + /* assign to FALSE (last phase was FALSE as well) */ + lit = not_lit; + } + } + + return lit; +} + +static unsigned +gcd (unsigned a, unsigned b) +{ + unsigned tmp; + + assert (a); + assert (b); + + if (a < b) + { + tmp = a; + a = b; + b = tmp; + } + + while (b) + { + assert (a >= b); + tmp = b; + b = a % b; + a = tmp; + } + + return a; +} + +static Lit * +rdecide (void) +{ + unsigned idx, delta, spread; + Lit * res; + + spread = RDECIDE; + if (rrng (1, spread) != 2) + return 0; + + assert (1 <= max_var); + idx = rrng (1, max_var); + res = int2lit (idx); + + if (res->val != UNDEF) + { + delta = rrng (1, max_var); + while (gcd (delta, max_var) != 1) + delta--; + + assert (1 <= delta); + assert (delta <= max_var); + + do { + idx += delta; + if (idx > max_var) + idx -= max_var; + res = int2lit (idx); + } while (res->val != UNDEF); + } + +#ifdef STATS + rdecisions++; +#endif + res = decide_phase (res); + LOG (fprintf (out, "%srdecide %d\n", prefix, lit2int (res))); + + return res; +} + +static Lit * +sdecide (void) +{ + Rnk *r, * tmp; + Lit *res; + + for (;;) + { + r = htop (); + res = RNK2LIT (r); + if (res->val == UNDEF) break; + tmp = hpop (); + assert (tmp == r); + NOLOG (fprintf (out, + "%shpop %u %u %u\n", + prefix, r - rnks, + FLTMANTISSA(r->score), + FLTEXPONENT(r->score))); + } + +#ifdef STATS + sdecisions++; +#endif + res = decide_phase (res); + + LOG (fprintf (out, "%ssdecide %d\n", prefix, lit2int (res))); + + return res; +} + +static Lit * +adecide (void) +{ + Lit *lit; + Var * v; + + assert (als < alshead); + assert (!failed_assumption); + + while (alstail < alshead) + { + lit = *alstail++; + + if (lit->val == FALSE) + { + failed_assumption = lit; + v = LIT2VAR (lit); + + use_var (v); + + LOG (fprintf (out, "%sfirst failed assumption %d\n", + prefix, lit2int (failed_assumption))); + fanalyze (); + return 0; + } + + if (lit->val == TRUE) + { + v = LIT2VAR (lit); + if (v->level > adecidelevel) + adecidelevel = v->level; + continue; + } + +#ifdef STATS + assumptions++; +#endif + LOG (fprintf (out, "%sadecide %d\n", prefix, lit2int (lit))); + adecidelevel = level + 1; + + return lit; + } + + return 0; +} + +static void +decide (void) +{ + Lit * lit; + + assert (!satisfied ()); + assert (!conflict); + + if (alstail < alshead && (lit = adecide ())) + ; + else if (failed_assumption) + return; + else if (satisfied ()) + return; + else if (!(lit = rdecide ())) + lit = sdecide (); + + assert (lit); + assign_decision (lit); + + levelsum += level; + decisions++; +} + +static int +sat (int l) +{ + int count = 0, backtracked; + + if (!conflict) + bcp (); + + if (conflict) + backtrack (); + + if (mtcls) + return PICOSAT_UNSATISFIABLE; + + if (satisfied ()) + goto SATISFIED; + + if (lsimplify <= propagations) + simplify (); + + if (mtcls) + return PICOSAT_UNSATISFIABLE; + + if (satisfied ()) + goto SATISFIED; + + init_restart (); + + isimplify = fixed; + backtracked = 0; + + for (;;) + { + if (!conflict) + bcp (); + + if (conflict) + { + incincs (); + backtrack (); + + if (mtcls) + return PICOSAT_UNSATISFIABLE; + backtracked = 1; + continue; + } + + if (satisfied ()) + { +SATISFIED: +#ifndef NDEBUG + original_clauses_satisfied (); + assumptions_satisfied (); +#endif + return PICOSAT_SATISFIABLE; + } + + if (backtracked) + { + backtracked = 0; + if (!level && isimplify < fixed) + iteration (); + } + + if (l >= 0 && count >= l) /* decision limit reached ? */ + return PICOSAT_UNKNOWN; + + if (propagations >= lpropagations)/* propagation limit reached ? */ + return PICOSAT_UNKNOWN; + +#ifndef NADC + if (!adodisabled && adoconflicts >= adoconflictlimit) + { + assert (bcp_queue_is_empty ()); + return PICOSAT_UNKNOWN; + } +#endif + + if (fsimplify < fixed && lsimplify <= propagations) + { + simplify (); + if (!bcp_queue_is_empty ()) + continue; +#ifndef NFL + if (mtcls) + return PICOSAT_UNSATISFIABLE; + + if (satisfied ()) + return PICOSAT_SATISFIABLE; + + assert (!level); +#endif + } + + if (!lreduce) + init_reduce (); + + if (need_to_reduce ()) + reduce (50); + + if (conflicts >= lrestart && level > 2) + restart (); + + decide (); + if (failed_assumption) + return PICOSAT_UNSATISFIABLE; + count++; + } +} + +static void +rebias (void) +{ + Cls ** p, * c; + Var * v; + + for (v = vars + 1; v <= vars + max_var; v++) + v->assigned = 0; + + memset (jwh, 0, 2 * (max_var + 1) * sizeof *jwh); + + for (p = oclauses; p < ohead; p++) + { + c = *p; + + if (!c) + continue; + + if (c->learned) + continue; + + incjwh (c); + } +} + +#ifdef TRACE + +static unsigned +core (void) +{ + unsigned idx, prev, this, delta, i, lcore, vcore; + unsigned *stack, *shead, *eos; + Lit **q, **eol, *lit; + Cls *cls, *reason; + Znt *p, byte; + Zhn *zhain; + Var *v; + + assert (trace); + + assert (mtcls || failed_assumption); + if (ocore >= 0) + return ocore; + + lcore = ocore = vcore = 0; + + stack = shead = eos = 0; + ENLARGE (stack, shead, eos); + + if (mtcls) + { + idx = CLS2IDX (mtcls); + *shead++ = idx; + } + else + { + assert (failed_assumption); + v = LIT2VAR (failed_assumption); + reason = v->reason; + assert (reason); + idx = CLS2IDX (reason); + *shead++ = idx; + } + + while (shead > stack) + { + idx = *--shead; + zhain = IDX2ZHN (idx); + + if (zhain) + { + if (zhain->core) + continue; + + zhain->core = 1; + lcore++; + + cls = IDX2CLS (idx); + if (cls) + { + assert (!cls->core); + cls->core = 1; + } + + i = 0; + delta = 0; + prev = 0; + for (p = zhain->znt; (byte = *p); p++, i += 7) + { + delta |= (byte & 0x7f) << i; + if (byte & 0x80) + continue; + + this = prev + delta; + assert (prev < this); /* no overflow */ + + if (shead == eos) + ENLARGE (stack, shead, eos); + *shead++ = this; + + prev = this; + delta = 0; + i = -7; + } + } + else + { + cls = IDX2CLS (idx); + + assert (cls); + assert (!cls->learned); + + if (cls->core) + continue; + + cls->core = 1; + ocore++; + + eol = end_of_lits (cls); + for (q = cls->lits; q < eol; q++) + { + lit = *q; + v = LIT2VAR (lit); + if (v->core) + continue; + + v->core = 1; + vcore++; + + if (!failed_assumption) continue; + if (lit != failed_assumption) continue; + + reason = v->reason; + if (!reason) continue; + if (reason->core) continue; + + idx = CLS2IDX (reason); + if (shead == eos) + ENLARGE (stack, shead, eos); + *shead++ = idx; + } + } + } + + DELETEN (stack, eos - stack); + + if (verbosity) + fprintf (out, + "%s%u core variables out of %u (%.1f%%)\n" + "%s%u core original clauses out of %u (%.1f%%)\n" + "%s%u core learned clauses out of %u (%.1f%%)\n", + prefix, vcore, max_var, PERCENT (vcore, max_var), + prefix, ocore, oadded, PERCENT (ocore, oadded), + prefix, lcore, ladded, PERCENT (lcore, ladded)); + + return ocore; +} + +static void +write_unsigned (unsigned d, FILE * file) +{ + static char write_unsigned_buffer[20]; + unsigned tmp; + char * res; + + assert (sizeof d <= 4); + + res = write_unsigned_buffer + sizeof write_unsigned_buffer; + *--res = 0; + tmp = d; + do { + assert (res > write_unsigned_buffer); + *--res = '0' + (tmp % 10); + tmp /= 10; + } while (tmp); + + fputs (res, file); +} + +static void +trace_lits (Cls * cls, FILE * file) +{ + Lit **p, **eol = end_of_lits (cls); + + assert (cls); + assert (cls->core); + + for (p = cls->lits; p < eol; p++) + { + write_int (LIT2INT (*p), file); + fputc (' ', file); + } + + fputc ('0', file); +} + +static void +write_idx (unsigned idx, FILE * file) +{ + write_unsigned (EXPORTIDX (idx), file); +} + +static void +trace_clause (unsigned idx, Cls * cls, FILE * file, int fmt) +{ + assert (cls); + assert (cls->core); + assert (fmt == RUP_TRACE_FMT || !cls->learned); + assert (CLS2IDX (cls) == idx); + + if (fmt != RUP_TRACE_FMT) + { + write_idx (idx, file); + fputc (' ', file); + } + + trace_lits (cls, file); + + if (fmt != RUP_TRACE_FMT) + fputs (" 0", file); + + fputc ('\n', file); +} + +static void +trace_zhain (unsigned idx, Zhn * zhain, FILE * file, int fmt) +{ + unsigned prev, this, delta, i; + Znt *p, byte; + Cls * cls; + + assert (zhain); + assert (zhain->core); + + write_idx (idx, file); + fputc (' ', file); + + if (fmt == EXTENDED_TRACECHECK_TRACE_FMT) + { + cls = IDX2CLS (idx); + assert (cls); + trace_lits (cls, file); + } + else + { + assert (fmt == COMPACT_TRACECHECK_TRACE_FMT); + putc ('*', file); + } + + i = 0; + delta = 0; + prev = 0; + + for (p = zhain->znt; (byte = *p); p++, i += 7) + { + delta |= (byte & 0x7f) << i; + if (byte & 0x80) + continue; + + this = prev + delta; + + putc (' ', file); + write_idx (this, file); + + prev = this; + delta = 0; + i = -7; + } + + fputs (" 0\n", file); +} + +static void +write_core (FILE * file) +{ + Lit **q, **eol; + Cls **p, *cls; + + fprintf (file, "p cnf %u %u\n", max_var, core ()); + + for (p = SOC; p != EOC; p = NXC (p)) + { + cls = *p; + + if (!cls || cls->learned || !cls->core) + continue; + + eol = end_of_lits (cls); + for (q = cls->lits; q < eol; q++) + { + write_int (LIT2INT (*q), file); + fputc (' ', file); + } + + fputs ("0\n", file); + } +} + +#endif + +static void +write_trace (FILE * file, int fmt) +{ +#ifdef TRACE + Cls *cls, ** p; + Zhn *zhain; + unsigned i; + + core (); + + if (fmt == RUP_TRACE_FMT) + { + rupvariables = picosat_variables (), + rupclauses = picosat_added_original_clauses (); + write_rup_header (file); + } + + for (p = SOC; p != EOC; p = NXC (p)) + { + cls = *p; + + if (oclauses <= p && p < eoo) + { + i = OIDX2IDX (p - oclauses); + assert (!cls || CLS2IDX (cls) == i); + } + else + { + assert (lclauses <= p && p < eol); + i = LIDX2IDX (p - lclauses); + } + + zhain = IDX2ZHN (i); + + if (zhain) + { + if (zhain->core) + { + if (fmt == RUP_TRACE_FMT) + trace_clause (i, cls, file, fmt); + else + trace_zhain (i, zhain, file, fmt); + } + } + else if (cls) + { + if (fmt != RUP_TRACE_FMT && cls) + { + if (cls->core) + trace_clause (i, cls, file, fmt); + } + } + } +#else + (void) file; + (void) fmt; +#endif +} + +static void +write_core_wrapper (FILE * file, int fmt) +{ + (void) fmt; +#ifdef TRACE + write_core (file); +#else + (void) file; +#endif +} + +static Lit * +import_lit (int lit) +{ + ABORTIF (lit == INT_MIN, "API usage: INT_MIN literal"); + + while (abs (lit) > (int) max_var) + inc_max_var (); + + return int2lit (lit); +} + +#ifdef TRACE +static void +reset_core (void) +{ + Cls ** p, * c; + Zhn ** q, * z; + unsigned i; + + for (i = 1; i <= max_var; i++) + vars[i].core = 0; + + for (p = SOC; p != EOC; p = NXC (p)) + if ((c = *p)) + c->core = 0; + + for (q = zhains; q != zhead; q++) + if ((z = *q)) + z->core = 0; + + ocore = -1; +} +#endif + +static void +reset_assumptions (void) +{ + Lit ** p; + + failed_assumption = 0; + + if (extracted_all_failed_assumptions) + { + for (p = als; p < alshead; p++) + LIT2VAR (*p)->failed = 0; + + extracted_all_failed_assumptions = 0; + } + + alstail = alshead = als; + adecidelevel = 0; +} + +static void +check_ready (void) +{ + ABORTIF (state == RESET, "API usage: uninitialized"); +} + +static void +check_sat_state (void) +{ + ABORTIF (state != SAT, "API usage: expected to be in SAT state"); +} + +static void +check_unsat_state (void) +{ + ABORTIF (state != UNSAT, "API usage: expected to be in UNSAT state"); +} + +static void +check_sat_or_unsat_or_unknown_state (void) +{ + ABORTIF (state != SAT && state != UNSAT && state != UNKNOWN, + "API usage: expected to be in SAT, UNSAT, or UNKNOWN state"); +} + +static void +reset_incremental_usage (void) +{ + unsigned num_non_false; + Lit * lit, ** q; + + check_sat_or_unsat_or_unknown_state (); + + LOG (fprintf (out, "%sRESET incremental usage\n", prefix)); + + if (level) + undo (0); + + reset_assumptions (); + + if (conflict) + { + num_non_false = 0; + for (q = conflict->lits; q < end_of_lits (conflict); q++) + { + lit = *q; + if (lit->val != FALSE) + num_non_false++; + } + + // assert (num_non_false >= 2); // TODO: why this assertion? +#ifdef NO_BINARY_CLAUSES + if (conflict == &cimpl) + resetcimpl (); +#endif +#ifndef NADC + if (conflict == adoconflict) + resetadoconflict (); +#endif + conflict = 0; + } + +#ifdef TRACE + reset_core (); +#endif + + saved_flips = flips; + min_flipped = UINT_MAX; + saved_max_var = max_var; + + state = READY; +} + +static void +enter (void) +{ + if (nentered++) + return; + + check_ready (); + entered = picosat_time_stamp (); +} + +static void +leave (void) +{ + assert (nentered); + if (--nentered) + return; + + sflush (); +} + +static void +check_trace_support_and_execute (FILE * file, void (*f)(FILE*,int), int fmt) +{ + check_ready (); + check_unsat_state (); +#ifdef TRACE + ABORTIF (!trace, "API usage: tracing disabled"); + enter (); + f (file, fmt); + leave (); +#else + (void) file; + (void) fmt; + (void) f; + ABORT ("compiled without trace support"); +#endif +} + +static void +extract_all_failed_assumptions (void) +{ + Lit ** p, ** eol; + Var * v, * u; + int pos; + Cls * c; + + assert (!extracted_all_failed_assumptions); + + assert (failed_assumption); + assert (mhead == marked); + + if (marked == eom) + ENLARGE (marked, mhead, eom); + + v = LIT2VAR (failed_assumption); + mark_var (v); + pos = 0; + + while (pos < mhead - marked) + { + v = marked[pos++]; + assert (v->mark); + c = var2reason (v); + if (!c) + continue; + eol = end_of_lits (c); + for (p = c->lits; p < eol; p++) + { + u = LIT2VAR (*p); + if (!u->mark) + mark_var (u); + } + } + + for (p = als; p < alshead; p++) + { + u = LIT2VAR (*p); + if (!u->mark) continue; + u->failed = 1; + LOG (fprintf (out, "%sfailed assumption %d\n", prefix, lit2int (*p))); + } + + while (mhead > marked) + (*--mhead)->mark = 0; + + extracted_all_failed_assumptions = 1; +} + +const char * +picosat_copyright (void) +{ + return "Copyright (c) 2006 - 2010 Armin Biere JKU Linz"; +} + +void +picosat_init (void) +{ + init (); +} + +void +picosat_adjust (int new_max_var) +{ + unsigned new_size_vars; + + enter (); + + new_max_var = abs (new_max_var); + new_size_vars = new_max_var + 1; + + if (size_vars < new_size_vars) + enlarge (new_size_vars); + + while (max_var < (unsigned) new_max_var) + inc_max_var (); + + leave (); +} + +int +picosat_inc_max_var (void) +{ + if (measurealltimeinlib) + enter (); + else + check_ready (); + + inc_max_var (); + + if (measurealltimeinlib) + leave (); + + return max_var; +} + +void +picosat_set_verbosity (int new_verbosity_level) +{ + check_ready (); + verbosity = new_verbosity_level; +} + +int +picosat_enable_trace_generation (void) +{ + int res = 0; + check_ready (); +#ifdef TRACE + ABORTIF (addedclauses, + "API usage: trace generation enabled after adding clauses"); + res = trace = 1; +#endif + return res; +} + +void +picosat_set_incremental_rup_file (FILE * rup_file, int m, int n) +{ + check_ready (); + assert (!rupstarted); + rup = rup_file; + rupvariables = m; + rupclauses = n; +} + +void +picosat_set_output (FILE * output_file) +{ + check_ready (); + out = output_file; +} + +void +picosat_measure_all_calls (void) +{ + check_ready (); + measurealltimeinlib = 1; +} + +void +picosat_set_prefix (const char * str) +{ + check_ready (); + new_prefix (str); +} + +void +picosat_set_seed (unsigned s) +{ + check_ready (); + srng = s; +} + +void +picosat_reset (void) +{ + check_ready (); + reset (); +} + +int +picosat_add (int int_lit) +{ + int res = oadded; + Lit *lit; + + if (measurealltimeinlib) + enter (); + else + check_ready (); + + ABORTIF (rup && rupstarted && oadded >= (unsigned)rupclauses, + "API usage: adding too many clauses after RUP header written"); +#ifndef NADC + ABORTIF (addingtoado, + "API usage: 'picosat_add' and 'picosat_add_ado_lit' mixed"); +#endif + if (state != READY) + reset_incremental_usage (); + + lit = import_lit (int_lit); + + if (int_lit) + add_lit (lit); + else + simplify_and_add_original_clause (); + + if (measurealltimeinlib) + leave (); + + return res; +} + +void +picosat_add_ado_lit (int external_lit) +{ +#ifndef NADC + Lit * internal_lit; + + if (measurealltimeinlib) + enter (); + else + check_ready (); + + if (state != READY) + reset_incremental_usage (); + + ABORTIF (!addingtoado && ahead > added, + "API usage: 'picosat_add' and 'picosat_add_ado_lit' mixed"); + + if (external_lit) + { + addingtoado = 1; + internal_lit = import_lit (external_lit); + add_lit (internal_lit); + } + else + { + addingtoado = 0; + add_ado (); + } + if (measurealltimeinlib) + leave (); +#else + (void) external_lit; + ABORT ("compiled without all different constraint support"); +#endif +} + +void +picosat_assume (int int_lit) +{ + Lit *lit; + + if (measurealltimeinlib) + enter (); + else + check_ready (); + + if (state != READY) + reset_incremental_usage (); + + lit = import_lit (int_lit); + if (alshead == eoals) + { + assert (alstail == als); + ENLARGE (als, alshead, eoals); + alstail = als; + } + + *alshead++ = lit; + LOG (fprintf (out, "%sassumption %d\n", prefix, int_lit)); + + if (measurealltimeinlib) + leave (); +} + +int +picosat_sat (int l) +{ + int res; + char ch; + + enter (); + + calls++; + LOG (fprintf (out, "%sSTART call %u\n", prefix, calls)); + + if (added < ahead) + { +#ifndef NADC + if (addingtoado) + ABORT ("API usage: incomplete all different constraint"); + else +#endif + ABORT ("API usage: incomplete clause"); + } + + if (state != READY) + reset_incremental_usage (); + + res = sat (l); + + assert (state == READY); + + switch (res) + { + case PICOSAT_UNSATISFIABLE: + ch = '0'; + state = UNSAT; + break; + case PICOSAT_SATISFIABLE: + ch = '1'; + state = SAT; + break; + default: + ch = '?'; + state = UNKNOWN; + break; + } + + if (verbosity) + { + report (1, ch); + rheader (); + } + + leave (); + LOG (fprintf (out, "%sEND call %u\n", prefix, calls)); + + last_sat_call_result = res; + + return res; +} + +int +picosat_res (void) +{ + return last_sat_call_result; +} + +int +picosat_deref (int int_lit) +{ + Lit *lit; + + check_ready (); + check_sat_state (); + ABORTIF (!int_lit, "API usage: can not deref zero literal"); + ABORTIF (mtcls, "API usage: deref after empty clause generated"); + +#ifdef STATS + derefs++; +#endif + + if (abs (int_lit) > (int) max_var) + return 0; + + lit = int2lit (int_lit); + + if (lit->val == TRUE) + return 1; + + if (lit->val == FALSE) + return -1; + + return 0; +} + +int +picosat_deref_toplevel (int int_lit) +{ + Lit *lit; + Var * v; + + check_ready (); + ABORTIF (!int_lit, "API usage: can not deref zero literal"); + ABORTIF (mtcls, "API usage: deref after empty clause generated"); + +#ifdef STATS + derefs++; +#endif + if (abs (int_lit) > (int) max_var) + return 0; + + lit = int2lit (int_lit); + + v = LIT2VAR (lit); + if (v->level > 0) + return 0; + + if (lit->val == TRUE) + return 1; + + if (lit->val == FALSE) + return -1; + + return 0; +} + +int +picosat_inconsistent (void) +{ + check_ready (); + return mtcls != 0; +} + +int +picosat_corelit (int int_lit) +{ + int res; + + check_ready (); + check_unsat_state (); + ABORTIF (!int_lit, "API usage: zero literal can not be in core"); + + assert (mtcls || failed_assumption); + + res = 0; + +#ifdef TRACE + { + ABORTIF (!trace, "tracing disabled"); + if (measurealltimeinlib) + enter (); + core (); + if (abs (int_lit) <= (int) max_var) + res = vars[abs (int_lit)].core; + assert (!res || failed_assumption || vars[abs (int_lit)].used); + if (measurealltimeinlib) + leave (); + } +#else + ABORT ("compiled without trace support"); +#endif + + return res; +} + +int +picosat_coreclause (int ocls) +{ + int res; + + check_ready (); + check_unsat_state (); + + ABORTIF (ocls < 0, "API usage: negative original clause index"); + ABORTIF (ocls >= (int)oadded, "API usage: original clause index exceeded"); + + assert (mtcls || failed_assumption); + + res = 0; + +#ifdef TRACE + { + Cls ** clsptr, * cls; + + ABORTIF (!trace, "tracing disabled"); + if (measurealltimeinlib) + enter (); + core (); + clsptr = oclauses + ocls; + assert (clsptr < ohead); + cls = *clsptr; + if (cls) + res = cls->core; + if (measurealltimeinlib) + leave (); + } +#else + ABORT ("compiled without trace support"); +#endif + + return res; +} + +int +picosat_failed_assumption (int int_lit) +{ + Lit * lit; + Var * v; + ABORTIF (!int_lit, "API usage: zero literal as assumption"); + check_ready (); + check_unsat_state (); + if (mtcls) + return 0; + assert (failed_assumption); + if (abs (int_lit) > (int) max_var) + return 0; + if (!extracted_all_failed_assumptions) + extract_all_failed_assumptions (); + lit = import_lit (int_lit); + v = LIT2VAR (lit); + return v->failed; +} + +const int * +picosat_failed_assumptions (void) +{ + Lit ** p, * lit; + Var * v; + int ilit; + + falshead = fals; + check_ready (); + check_unsat_state (); + if (!mtcls) + { + assert (failed_assumption); + if (!extracted_all_failed_assumptions) + extract_all_failed_assumptions (); + + for (p = als; p < alshead; p++) + { + lit = *p; + v = LIT2VAR (*p); + if (!v->failed) + continue; + ilit = LIT2INT (lit); + if (falshead == eofals) + ENLARGE (fals, falshead, eofals); + *falshead++ = ilit; + } + } + if (falshead == eofals) + ENLARGE (fals, falshead, eofals); + *falshead++ = 0; + return fals; +} + +static const char * enumstr (int i) { + int last = i % 10; + if (last == 1) return "st"; + if (last == 2) return "nd"; + if (last == 3) return "rd"; + return "th"; +} + +const int * +picosat_mus_assumptions (void * s, void (*cb)(void*,const int*), int fix) +{ + int i, j, ilit, len, oldlen, norig = alshead - als, nwork, * work, res; + signed char * redundant; + Lit ** p, * lit; + int failed; + Var * v; + + check_ready (); + check_unsat_state (); + len = 0; + if (!mtcls) + { + assert (failed_assumption); + if (!extracted_all_failed_assumptions) + extract_all_failed_assumptions (); + + for (p = als; p < alshead; p++) + if (LIT2VAR (*p)->failed) + len++; + } + + if (mass) + DELETEN (mass, szmass); + szmass = len + 1; + NEWN (mass, szmass); + + i = 0; + for (p = als; p < alshead; p++) + { + lit = *p; + v = LIT2VAR (lit); + if (!v->failed) + continue; + ilit = LIT2INT (lit); + assert (i < len); + mass[i++] = ilit; + } + assert (i == len); + mass[i] = 0; + if (verbosity) + fprintf (out, + "%sinitial set of failed assumptions of size %d out of %d (%.0f%%)\n", + prefix, len, norig, PERCENT (len, norig)); + if (cb) + cb (s, mass); + + nwork = len; + NEWN (work, nwork); + for (i = 0; i < len; i++) + work[i] = mass[i]; + + NEWN (redundant, nwork); + CLRN (redundant, nwork); + + for (i = 0; i < nwork; i++) + { + if (redundant[i]) + continue; + + if (verbosity > 1) + fprintf (out, + "%strying to drop %d%s assumption %d\n", + prefix, i, enumstr (i), work[i]); + for (j = 0; j < nwork; j++) + if (i != j && !redundant[j]) + picosat_assume (work[j]); + + res = picosat_sat (-1); + if (res == 10) + { + if (verbosity > 1) + fprintf (out, + "%sfailed to drop %d%s assumption %d\n", + prefix, i, enumstr (i), work[i]); + + if (fix) + { + picosat_add (work[i]); + picosat_add (0); + } + } + else + { + assert (res == 20); + if (verbosity > 1) + fprintf (out, + "%ssuceeded to drop %d%s assumption %d\n", + prefix, i, enumstr (i), work[i]); + redundant[i] = 1; + for (j = 0; j < nwork; j++) + { + failed = picosat_failed_assumption (work[j]); + if (j <= i) + { + assert (redundant[j] == !failed); + continue; + } + + if (!failed) + { + redundant[j] = -1; + if (verbosity > 1) + fprintf (out, + "%salso suceeded to drop %d%s assumption %d\n", + prefix, j, enumstr (j), work[j]); + } + } + + oldlen = len; + len = 0; + for (j = 0; j < nwork; j++) + if (!redundant[j]) + mass[len++] = work[j]; + mass[len] = 0; + assert (len < oldlen); + + if (fix) + { + picosat_add (-work[i]); + picosat_add (0); + } + +#ifndef NDEBUG + for (j = 0; j <= i; j++) + assert (redundant[j] >= 0); +#endif + for (j = i + 1; j < nwork; j++) + { + if (redundant[j] >= 0) + continue; + + if (fix) + { + picosat_add (-work[j]); + picosat_add (0); + } + + redundant[j] = 1; + } + + if (verbosity) + fprintf (out, + "%sreduced set of failed assumptions of size %d out of %d (%.0f%%)\n", + prefix, len, norig, PERCENT (len, norig)); + if (cb) + cb (s, mass); + } + } + + DELETEN (work, nwork); + DELETEN (redundant, nwork); + + if (verbosity) + fprintf (out, "%sreinitializaing unsat state", prefix); + for (i = 0; i < len; i++) + picosat_assume (mass[i]); + res = picosat_sat (-1); + assert (res == 20); + + return mass; +} + +int +picosat_usedlit (int int_lit) +{ + int res; + check_ready (); + check_sat_or_unsat_or_unknown_state (); + ABORTIF (!int_lit, "API usage: zero literal can not be used"); + int_lit = abs (int_lit); + res = (int_lit <= (int) max_var) ? vars[int_lit].used : 0; + return res; +} + +void +picosat_write_clausal_core (FILE * file) +{ + check_trace_support_and_execute (file, write_core_wrapper, 0); +} + +void +picosat_write_compact_trace (FILE * file) +{ + check_trace_support_and_execute (file, write_trace, + COMPACT_TRACECHECK_TRACE_FMT); +} + +void +picosat_write_extended_trace (FILE * file) +{ + check_trace_support_and_execute (file, write_trace, + EXTENDED_TRACECHECK_TRACE_FMT); +} + +void +picosat_write_rup_trace (FILE * file) +{ + check_trace_support_and_execute (file, write_trace, RUP_TRACE_FMT); +} + +size_t +picosat_max_bytes_allocated (void) +{ + check_ready (); + return max_bytes; +} + +void +picosat_set_propagation_limit (unsigned long long l) +{ + lpropagations = l; +} + +unsigned long long +picosat_propagations (void) +{ + return propagations; +} + +int +picosat_variables (void) +{ + check_ready (); + return (int) max_var; +} + +int +picosat_added_original_clauses (void) +{ + check_ready (); + return (int) oadded; +} + +void +picosat_stats (void) +{ + unsigned redlits; +#ifdef STATS + check_ready (); + assert (sdecisions + rdecisions + assumptions == decisions); +#endif + if (calls > 1) + fprintf (out, "%s%u calls\n", prefix, calls); + fprintf (out, "%s%u iterations\n", prefix, iterations); + fprintf (out, "%s%u restarts", prefix, restarts); +#ifdef STATS + fprintf (out, " (%u skipped)", skippedrestarts); +#endif + fputc ('\n', out); +#ifndef NFL + fprintf (out, "%s%u failed literals", prefix, failedlits); +#ifdef STATS + fprintf (out, + ", %u calls, %u rounds, %llu propagations", + flcalls, flrounds, flprops); +#endif + fputc ('\n', out); +#ifdef STATS + fprintf (out, + "%sfl: %u = %.1f%% implicit, %llu oopsed, %llu tried, %llu skipped\n", + prefix, + ifailedlits, PERCENT (ifailedlits, failedlits), + floopsed, fltried, flskipped); +#endif +#endif + fprintf (out, "%s%u conflicts", prefix, conflicts); +#ifdef STATS + fprintf (out, " (%u uips = %.1f%%)\n", uips, PERCENT(uips,conflicts)); +#else + fputc ('\n', out); +#endif +#ifndef NADC + fprintf (out, "%s%u adc conflicts\n", prefix, adoconflicts); +#endif +#ifdef STATS + fprintf (out, "%s%llu dereferenced literals\n", prefix, derefs); +#endif + fprintf (out, "%s%u decisions", prefix, decisions); +#ifdef STATS + fprintf (out, " (%u random = %.2f%%", + rdecisions, PERCENT (rdecisions, decisions)); + fprintf (out, ", %u assumptions", assumptions); + fputc (')', out); +#endif + fputc ('\n', out); +#ifdef STATS + fprintf (out, + "%s%u static phase decisions (%.1f%% of all variables)\n", + prefix, + staticphasedecisions, PERCENT (staticphasedecisions, max_var)); +#endif + fprintf (out, "%s%u fixed variables\n", prefix, fixed); + assert (nonminimizedllits >= minimizedllits); + redlits = nonminimizedllits - minimizedllits; + fprintf (out, "%s%u learned literals\n", prefix, llitsadded); + fprintf (out, "%s%.1f%% deleted literals\n", + prefix, PERCENT (redlits, nonminimizedllits)); + +#ifdef STATS +#ifndef NO_BINARY_CLAUSES + fprintf (out, + "%s%llu antecedents (%.1f antecedents per clause", + prefix, antecedents, AVERAGE (antecedents, conflicts)); +#endif +#ifdef TRACE + if (trace) + fprintf (out, ", %.1f bytes/antecedent)", AVERAGE (znts, antecedents)); +#endif +#if !defined(NO_BINARY_CLAUSES) || defined(TRACE) + fputs (")\n", out); +#endif + + fprintf (out, "%s%llu propagations (%.1f propagations per decision)\n", + prefix, propagations, AVERAGE (propagations, decisions)); + fprintf (out, "%s%llu visits (%.1f per propagation)\n", + prefix, visits, AVERAGE (visits, propagations)); + fprintf (out, + "%s%llu binary clauses visited (%.1f%% %.1f per propagation)\n", + prefix, bvisits, + PERCENT (bvisits, visits), + AVERAGE (bvisits, propagations)); + fprintf (out, + "%s%llu ternary clauses visited (%.1f%% %.1f per propagation)\n", + prefix, tvisits, + PERCENT (tvisits, visits), + AVERAGE (tvisits, propagations)); + fprintf (out, + "%s%llu large clauses visited (%.1f%% %.1f per propagation)\n", + prefix, lvisits, + PERCENT (lvisits, visits), + AVERAGE (lvisits, propagations)); + fprintf (out, "%s%llu other true (%.1f%% of visited clauses)\n", + prefix, othertrue, PERCENT (othertrue, visits)); + fprintf (out, + "%s%llu other true in binary clauses (%.1f%%)" + ", %llu upper (%.1f%%)\n", + prefix, othertrue2, PERCENT (othertrue2, othertrue), + othertrue2u, PERCENT (othertrue2u, othertrue2)); + fprintf (out, + "%s%llu other true in large clauses (%.1f%%)" + ", %llu upper (%.1f%%)\n", + prefix, othertruel, PERCENT (othertruel, othertrue), + othertruelu, PERCENT (othertruelu, othertruel)); + fprintf (out, "%s%llu ternary and large traversals (%.1f per visit)\n", + prefix, traversals, AVERAGE (traversals, visits)); + fprintf (out, "%s%llu large traversals (%.1f per large visit)\n", + prefix, ltraversals, AVERAGE (ltraversals, lvisits)); + fprintf (out, "%s%llu assignments\n", prefix, assignments); +#else + fprintf (out, "%s%llu propagations\n", prefix, picosat_propagations ()); +#endif + fprintf (out, "%s%.1f%% variables used\n", prefix, PERCENT (vused, max_var)); + + sflush (); + fprintf (out, "%s%.1f seconds in library\n", prefix, seconds); + fprintf (out, "%s%.1f megaprops/second\n", + prefix, AVERAGE (propagations / 1e6f, seconds)); +#ifdef STATS + fprintf (out, "%s%.1f million visits per second\n", + prefix, AVERAGE (visits / 1e6f, seconds)); + fprintf (out, + "%srecycled %.1f MB in %u reductions\n", + prefix, rrecycled / (double) (1 << 20), reductions); + fprintf (out, + "%srecycled %.1f MB in %u simplifications\n", + prefix, srecycled / (double) (1 << 20), simps); +#else + fprintf (out, "%s%u simplifications\n", prefix, simps); + fprintf (out, "%s%u reductions\n", prefix, reductions); + fprintf (out, "%s%.1f MB recycled\n", prefix, recycled / (double) (1 << 20)); +#endif + fprintf (out, "%s%.1f MB maximally allocated\n", + prefix, picosat_max_bytes_allocated () / (double) (1 << 20)); +} + +#ifndef NGETRUSAGE +#include <sys/time.h> +#include <sys/resource.h> +#include <sys/unistd.h> +#endif + +double +picosat_time_stamp (void) +{ + double res = -1; +#ifndef NGETRUSAGE + struct rusage u; + res = 0; + if (!getrusage (RUSAGE_SELF, &u)) + { + res += u.ru_utime.tv_sec + 1e-6 * u.ru_utime.tv_usec; + res += u.ru_stime.tv_sec + 1e-6 * u.ru_stime.tv_usec; + } +#endif + return res; +} + +double +picosat_seconds (void) +{ + check_ready (); + return seconds; +} + +void +picosat_print (FILE * file) +{ +#ifdef NO_BINARY_CLAUSES + Lit * lit, *other, * last; + Ltk * stack; +#endif + Lit **q, **eol; + Cls **p, *cls; + unsigned n; + + if (measurealltimeinlib) + enter (); + else + check_ready (); + + n = 0; + n += alshead - als; + + for (p = SOC; p != EOC; p = NXC (p)) + { + cls = *p; + + if (!cls) + continue; + +#ifdef TRACE + if (cls->collected) + continue; +#endif + n++; + } + +#ifdef NO_BINARY_CLAUSES + last = int2lit (-max_var); + for (lit = int2lit (1); lit <= last; lit++) + { + stack = LIT2IMPLS (lit); + eol = stack->start + stack->count; + for (q = stack->start; q < eol; q++) + if (*q >= lit) + n++; + } +#endif + + fprintf (file, "p cnf %d %u\n", max_var, n); + + for (p = SOC; p != EOC; p = NXC (p)) + { + cls = *p; + if (!cls) + continue; + +#ifdef TRACE + if (cls->collected) + continue; +#endif + + eol = end_of_lits (cls); + for (q = cls->lits; q < eol; q++) + { + write_int (lit2int (*q), file); + fputc (' ', file); + } + + fputs ("0\n", file); + } + +#ifdef NO_BINARY_CLAUSES + last = int2lit (-max_var); + for (lit = int2lit (1); lit <= last; lit++) + { + stack = LIT2IMPLS (lit); + eol = stack->start + stack->count; + for (q = stack->start; q < eol; q++) + if ((other = *q) >= lit) + fprintf (file, "%d %d 0\n", lit2int (lit), lit2int (other)); + } +#endif + + { + Lit **r; + for (r = als; r < alshead; r++) + fprintf (file, "%d 0\n", lit2int (*r)); + } + + fflush (file); + + if (measurealltimeinlib) + leave (); +} + +void +picosat_enter (void) +{ + enter (); +} + +void +picosat_leave (void) +{ + leave (); +} + +void +picosat_message (int level, const char * fmt, ...) +{ + va_list ap; + + if (level > verbosity) + return; + + fputs (prefix, out); + va_start (ap, fmt); + vfprintf (out, fmt, ap); + va_end (ap); + fputc ('\n', out); +} + +int +picosat_changed (void) +{ + int res; + + check_ready (); + check_sat_state (); + + res = (min_flipped <= saved_max_var); + assert (!res || saved_flips != flips); + + return res; +} + +static void +setemgr (void * nmgr) +{ + ABORTIF (emgr && emgr != nmgr, + "API usage: mismatched external memory managers"); + emgr = nmgr; +} + +void +picosat_set_new (void * nmgr, void * (*nnew)(void*,size_t)) +{ + ABORTIF (state != RESET, + "API usage: 'picosat_set_new' after 'picosat_init'"); + enew = nnew; + setemgr (nmgr); +} + +void +picosat_set_resize (void * nmgr, void * (*nresize)(void*,void*,size_t,size_t)) +{ + ABORTIF (state != RESET, + "API usage: 'picosat_set_resize' after 'picosat_init'"); + eresize = nresize; + setemgr (nmgr); +} + +void +picosat_set_delete (void * nmgr, void (*ndelete)(void*,void*,size_t)) +{ + ABORTIF (state != RESET, + "API usage: 'picosat_set_delete' after 'picosat_init'"); + edelete = ndelete; + setemgr (nmgr); +} + +void +picosat_reset_phases (void) +{ + rebias (); +} + +void +picosat_reset_scores (void) +{ + Rnk * r; + hhead = heap + 1; + for (r = rnks + 1; r <= rnks + max_var; r++) + { + CLR (r); + hpush (r); + } +} + +void +picosat_remove_learned (unsigned percentage) +{ + reset_incremental_usage (); + reduce (percentage); +} + +void +picosat_set_global_default_phase (int phase) +{ + check_ready (); + ABORTIF (phase < 0, "API usage: 'picosat_set_global_default_phase' " + "with negative argument"); + ABORTIF (phase > 3, "API usage: 'picosat_set_global_default_phase' " + "with argument > 3"); + defaultphase = phase; +} + +void +picosat_set_default_phase_lit (int int_lit, int phase) +{ + unsigned newphase; + Lit * lit; + Var * v; + + check_ready (); + + lit = import_lit (int_lit); + v = LIT2VAR (lit); + + if (phase) + { + newphase = (int_lit < 0) == (phase < 0); + v->phase = newphase; + v->assigned = 1; + } + else + v->assigned = 0; +} + +void +picosat_set_more_important_lit (int int_lit) +{ + Lit * lit; + Var * v; + Rnk * r; + + check_ready (); + + lit = import_lit (int_lit); + v = LIT2VAR (lit); + r = VAR2RNK (v); + + ABORTIF (r->lessimportant, "can not mark variable more and less important"); + + if (r->moreimportant) + return; + + r->moreimportant = 1; + + if (r->pos) + hup (r); +} + +void +picosat_set_less_important_lit (int int_lit) +{ + Lit * lit; + Var * v; + Rnk * r; + + check_ready (); + + lit = import_lit (int_lit); + v = LIT2VAR (lit); + r = VAR2RNK (v); + + ABORTIF (r->moreimportant, "can not mark variable more and less important"); + + if (r->lessimportant) + return; + + r->lessimportant = 1; + + if (r->pos) + hup (r); +} + +#ifndef NADC + +unsigned +picosat_ado_conflicts (void) +{ + check_ready (); + return adoconflicts; +} + +void +picosat_disable_ado (void) +{ + check_ready (); + assert (!adodisabled); + adodisabled = 1; +} + +void +picosat_enable_ado (void) +{ + check_ready (); + assert (adodisabled); + adodisabled = 0; +} + +void +picosat_set_ado_conflict_limit (unsigned newadoconflictlimit) +{ + check_ready (); + adoconflictlimit = newadoconflictlimit; +} + +#endif + +int +picosat_haveados (void) +{ +#ifndef NADC + return 1; +#else + return 0; +#endif +} diff --git a/src/prop/bvpicosat/picosat.h b/src/prop/bvpicosat/picosat.h new file mode 100644 index 000000000..e2b5f3752 --- /dev/null +++ b/src/prop/bvpicosat/picosat.h @@ -0,0 +1,484 @@ +/**************************************************************************** +Copyright (c) 2006 - 2010, Armin Biere, Johannes Kepler University. + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to +deal in the Software without restriction, including without limitation the +rights to use, copy, modify, merge, publish, distribute, sublicense, and/or +sell copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS +IN THE SOFTWARE. +****************************************************************************/ + +#ifdef __cplusplus +extern "C" { +#endif + +#ifndef picosat_h_INCLUDED +#define picosat_h_INCLUDED + +/*------------------------------------------------------------------------*/ + +#include <stdlib.h> +#include <stdio.h> + +/*------------------------------------------------------------------------*/ +/* These are the return values for 'picosat_sat' as for instance + * standardized by the output format of the SAT competition. + */ +#define PICOSAT_UNKNOWN 0 +#define PICOSAT_SATISFIABLE 10 +#define PICOSAT_UNSATISFIABLE 20 + +/*------------------------------------------------------------------------*/ + + + + +const char *picosat_version (void); +const char *picosat_config (void); +const char *picosat_copyright (void); + +/*------------------------------------------------------------------------*/ +/* You can make picosat use an external memory manager instead of the one + * provided by LIBC. But then you need to call these three function before + * 'picosat_init'. The memory manager functions here all have an additional + * first argument which is a pointer to the memory manager, but otherwise + * are supposed to work as their LIBC counter parts 'malloc', 'realloc' and + * 'free'. As exception the 'resize' and 'delete' function have as third + * argument the number of bytes of the block given as second argument. + */ +void picosat_set_new (void * mgr, void * (*)(void *, size_t)); +void picosat_set_resize (void *, void * (*)(void *, void *, size_t, size_t)); +void picosat_set_delete (void *, void (*)(void *, void *, size_t)); + +/*------------------------------------------------------------------------*/ + +void picosat_init (void); /* constructor */ +void picosat_reset (void); /* destructor */ + +/*------------------------------------------------------------------------*/ +/* The following five functions are essentially parameters to 'init', and + * thus should be called right after 'picosat_init' before doing anything + * else. You should not call any of them after adding a literal. + */ + +/* Set output file, default is 'stdout'. + */ +void picosat_set_output (FILE *); + +/* Measure all time spent in all calls in the solver. By default only the + * time spent in 'picosat_sat' is measured. Enabling this function may for + * instance tripple the time needed to add large CNFs, since every call to + * 'picosat_add' will trigger a call to 'getrusage'. + */ +void picosat_measure_all_calls (void); + +/* Set the prefix used for printing verbose messages and statistics. + * Default is "c ". + */ +void picosat_set_prefix (const char *); + +/* The function 'picosat_set_incremental_rup_file' produces + * a proof trace in RUP format on the fly. The resulting RUP file may + * contain learned clauses that are not actual in the clausal core. + */ + +/* Set verbosity level. A verbosity level of 1 and above prints more and + * more detailed progress reports on the output file, set by + * 'picosat_set_output'. Verbose messages are prefixed with the string set + * by 'picosat_set_prefix'. + */ +void picosat_set_verbosity (int new_verbosity_level); + +/* Set default initial phase: + * + * 0 = false + * 1 = true + * 2 = Jeroslow-Wang (default) + * 3 = random initial phase + * + * After a variable has been assigned the first time, it will always + * be assigned the previous value if it is picked as decision variable. + * The initial assignment can be choosen with this function. + */ +void picosat_set_global_default_phase (int); + +/* Set next/initial phase of a particular variable if picked as decision + * variable. Second argument 'phase' has the following meaning: + * + * negative = next value if picked as decision variable is false + * + * positive = next value if picked as decision variable is true + * + * 0 = use global default phase as next value and + * assume 'lit' was never assigned + * + * Again if 'lit' is assigned afterwards through a forced assignment, + * then this forced assignment is the next phase if this variable is + * used as decision variable. + */ +void picosat_set_default_phase_lit (int lit, int phase); + +/* You can reset all phases by the following function. + */ +void picosat_reset_phases (void); + +/* Scores can be erased as well. Not however, that even after erasing + * scores and phases, learned clauses are kept. In addition head tail + * pointers for literals are not moved either. So expect to be a difference + * between calling the solver in incremental mode or with a fresh copy of + * the CNF. + */ +void picosat_reset_scores (void); + +/* Reset assignment if in SAT state and then remove the given percentage of + * less active (large) learned clauses. If you specify 100% all large + * learned clauses are removed. + */ +void picosat_remove_learned (unsigned percentage); + +/* Set some variables to be more important than others. These variables are + * always used as decisions before other variables are used. Dually there + * is a set of variables that is used last. The default is + * to mark all variables as being indifferent only. + */ +void picosat_set_more_important_lit (int lit); +void picosat_set_less_important_lit (int lit); + +/* Allows to print to internal 'out' file from client. + */ +void picosat_message (int verbosity_level, const char * fmt, ...); + +/* Deprecated! + */ +#define picosat_enable_verbosity() picosat_set_verbosity (1) + +/* Set a seed for the random number generator. The random number generator + * is currently just used for generating random decisions. In our + * experiments having random decisions did not really help on industrial + * examples, but was rather helpful to randomize the solver in order to + * do proper benchmarking of different internal parameter sets. + */ +void picosat_set_seed (unsigned random_number_generator_seed); + +/* If you ever want to extract cores or proof traces with the current + * instance of PicoSAT initialized with 'picosat_init', then make sure to + * call 'picosat_enable_trace_generation' right after 'picosat_init'. This + * is not necessary if you only use 'picosat_set_incremental_rup_file'. + * + * NOTE, trace generation code is not necessarily included, e.g. if you + * configure picosat with full optimzation as './configure -O' or with + * './configure --no-trace'. This speeds up the solver slightly. Then you + * you do not get any results by trying to generate traces. + * + * The return value is non-zero if code for generating traces is including + * and it is zero if traces can not be generated. + */ +int picosat_enable_trace_generation (void); + +/* You can dump proof traces in RUP format incrementally even without + * keeping the proof trace in memory. The advantage is a reduction of + * memory usage, but the dumped clauses do not necessarily belong to the + * clausal core. Beside the file the additional parameters denotes the + * maximal number of variables and the number of original clauses. + */ +void picosat_set_incremental_rup_file (FILE * file, int m, int n); + +/*------------------------------------------------------------------------*/ +/* This function returns the next available unused variable index and + * allocates a variable for it even though this variable does not occur as + * assumption, nor in a clause or any other constraints. In future calls to + * 'picosat_sat', 'picosat_deref' and particularly for 'picosat_changed', + * this variable is treated as if it had been used. + */ +int picosat_inc_max_var (void); + +/*------------------------------------------------------------------------*/ +/* If you know a good estimate on how many variables you are going to use + * then calling this function before adding literals will result in less + * resizing of the variable table. But this is just a minor optimization. + * Beside exactly allocating enough variables it has the same effect as + * calling 'picosat_inc_max_var'. + */ +void picosat_adjust (int max_idx); + +/*------------------------------------------------------------------------*/ +/* Statistics. + */ +int picosat_variables (void); /* p cnf <m> n */ +int picosat_added_original_clauses (void); /* p cnf m <n> */ +size_t picosat_max_bytes_allocated (void); +double picosat_time_stamp (void); /* ... in process */ +void picosat_stats (void); /* > output file */ +unsigned long long picosat_propagations (void); /* #propagations */ + +/* The time spent in the library or in 'picosat_sat'. The former is only + * returned if, right after initialization 'picosat_measure_all_calls' + * is called. + */ +double picosat_seconds (void); + +/*------------------------------------------------------------------------*/ +/* Add a literal of the next clause. A zero terminates the clause. The + * solver is incremental. Adding a new literal will reset the previous + * assignment. The return value is the original clause index to which + * this literal respectively the trailing zero belong starting at 0. + */ +int picosat_add (int lit); + +/* Print the CNF to the given file in DIMACS format. + */ +void picosat_print (FILE *); + +/* You can add arbitrary many assumptions before the next 'picosat_sat'. + * This is similar to the using assumptions in MiniSAT, except that you do + * not have to collect all your assumptions yourself. In PicoSAT you can + * add one after the other before the next call to 'picosat_sat'. + * + * These assumptions can be seen as adding unit clauses with those + * assumptions as literals. However these assumption clauses are only valid + * for exactly the next call to 'picosat_sat'. And will be removed + * afterwards, e.g. in future calls to 'picosat_sat' after the next one they + * are not assumed, unless they are assumed again trough 'picosat_assume'. + * + * More precisely, assumptions actually remain valid even after the next + * call to 'picosat_sat' returns. Valid means they remain 'assumed' until a + * call to 'picosat_add', 'picosat_assume', or another 'picosat_sat, + * following the first 'picosat_sat'. They need to stay valid for + * 'picosat_failed_assumption' to return correct values. + * + * Example: + * + * picosat_assume (1); // assume unit clause '1 0' + * picosat_assume (-2); // additionally assume clause '-2 0' + * res = picosat_sat (1000); // assumes 1 and -2 to hold + * // 1000 decisions max. + * + * if (res == PICOSAT_UNSATISFIABLE) + * { + * if (picosat_failed_assumption (1)) + * // unit clause '1 0' was necessary to derive UNSAT + * + * if (picosat_failed_assumption (-2)) + * // unit clause '-2 0' was necessary to derive UNSAT + * + * // at least one but also both could be necessary + * + * picosat_assume (17); // previous assumptions are removed + * // now assume unit clause '17 0' for + * // the next call to 'picosat_sat' + * + * // adding a new clause, actually the first literal of + * // a clause would also make the assumptions used in the previous + * // call to 'picosat_sat' invalid. + * + * // The first two assumptions above are not assumed anymore. Only + * // the assumptions, since the last call to 'picosat_sat' returned + * // are assumed, e.g. the unit clause '17 0'. + * + * res = picosat_sat (-1); + * } + * else if (res == PICOSAT_SATISFIABLE) + * { + * // now the assignment is valid and we can call 'picosat_deref' + * + * assert (picosat_deref (1) == 1)); + * assert (picosat_deref (-2) == 1)); + * + * val = picosat_deref (15); + * + * // previous two assumptions are still valid + * + * // would become invalid if 'picosat_add' or 'picosat_assume' is + * // called here, but we immediately call 'picosat_sat'. Now when + * // entering 'picosat_sat' the solver nows that the previous call + * // returned SAT and it can savely reset the previous assumptions + * + * res = picosat_sat (-1); + * } + * else + * { + * assert (res == PICOSAT_UNKNOWN); + * + * // assumptions valid, but assignment invalid + * // except for top level assigned literals which + * // necessarily need to have this value if the formula is SAT + * + * // as above the solver nows that the previous call returned UNKWOWN + * // and will before doing anything else reset assumptions + * + * picosat_sat (-1); + * } + */ +void picosat_assume (int lit); + +/*------------------------------------------------------------------------*/ +/* This is an experimental feature for handling 'all different constraints' + * (ADC). Currently only one global ADC can be handled. The bit-width of + * all the bit-vectors entered in this ADC (stored in 'all different + * objects' or ADOs) has to be identical. + * + * TODO: also handle top level assigned literals here. + */ +void picosat_add_ado_lit (int); + +/*------------------------------------------------------------------------*/ +/* Call the main SAT routine. A negative decision limit sets no limit on + * the number of decisions. The return values are as above, e.g. + * 'PICOSAT_UNSATISFIABLE', 'PICOSAT_SATISFIABLE', or 'PICOSAT_UNKNOWN'. + */ +int picosat_sat (int decision_limit); + +/* As alternative to a decision limit you can use the number of propagations + * as limit. This is more linearly related to execution time. + */ +void picosat_set_propagation_limit (unsigned long long limit); + +/* Return last result of calling 'picosat_sat' or '0' if not called. + */ +int picosat_res (); + +/* After 'picosat_sat' was called and returned 'PICOSAT_SATISFIABLE', then + * the satisfying assignment can be obtained by 'dereferencing' literals. + * The value of the literal is return as '1' for 'true', '-1' for 'false' + * and '0' for an unknown value. + */ +int picosat_deref (int lit); + +/* Same as before but just returns true resp. false if the literals is + * forced to this assignment at the top level. This function does not + * require that 'picosat_sat' was called and also does not internally reset + * incremental usage. + */ +int picosat_deref_toplevel (int lit); + +/* Returns non zero if the CNF is unsatisfiable because an empty clause was + * added or derived. + */ +int picosat_inconsistent (void); + +/* Returns non zero if the literal is a failed assumption, which is defined + * as an assumption used to derive unsatisfiability. This is as accurate as + * generating core literals, but still of course is an overapproximation of + * the set of assumptions really necessary. The technique does not need + * clausal core generation nor tracing to be enabled and thus can be much + * more effectice. The function can only be called as long the current + * assumptions are valid. See 'picosat_assume' for more details. + */ +int picosat_failed_assumption (int lit); + +/* Returns a zero terminated list of failed assumption in the last call to + * 'picosat_sat'. The pointer is valid until the next call to + * 'picosat_sat' or 'picosat_failed_assumptions'. It only makes sense if the + * last call to 'picosat_sat' returned 'PICOSAT_UNSATISFIABLE'. + */ +const int * picosat_failed_assumptions (void); + +/* Returns a zero terminated minimized list of failed assumption for the last + * call to 'picosat_sat'. The pointer is valid until the next call to this + * function or 'picosat_sat' or 'picosat_mus_assumptions'. It only makes sense + * if the last call to 'picosat_sat' returned 'PICOSAT_UNSATISFIABLE'. + * + * The + * call back function is called for all succesful simplification attempts. The + * first argument of the call back function is the state given as first + * argument to 'picosat_mus_assumptions'. The second argument to the call back + * function is the new reduced list of failed assumptions. + * + * This function will call 'picosat_assume' and 'picosat_sat' internally but + * before returning reestablish a proper UNSAT state, e.g. + * 'picosat_failed_assumption' will work afterwards as expected. + * + * The last argument if non zero fixes assumptions. In particular, if an + * assumption can not be removed it is permanently assigned true, otherwise + * if it turns out to be redundant it is permanently assumed to be false. + */ +const int * picosat_mus_assumptions (void *, void(*)(void*,const int*),int); + +/*------------------------------------------------------------------------*/ +/* Assume that a previous call to 'picosat_sat' in incremental usage, + * returned 'SATISFIABLE'. Then a couple of clauses and optionally new + * variables were added (a new variable is a variable that has an index + * larger then the maximum variable added so far). The next call to + * 'picosat_sat' also returns 'SATISFIABLE'. If this function + * 'picosat_changed' returns '0', then the assignment to the old variables + * did not change. Otherwise it may have changed. The return value to + * this function is only valid until new clauses are added through + * 'picosat_add', an assumption is made through 'picosat_assume', or again + * 'picosat_sat' is called. This is the same assumption as for + * 'picosat_deref'. + * + * TODO currently this function may also return a non zero value even if the + * old assignment did not change, because it only checks whether the + * assignment of at least one old variable was flipped at least once during + * the search. In principle it should be possible to be exact in the other + * direcetion as well by using a counter of variables that have an odd + * number of flips. But this is not implemented yet. + */ +int picosat_changed (void); + +/*------------------------------------------------------------------------*/ +/* The following six functions internally extract the variable and clausal + * core and thus require trace generation to be enabled with + * 'picosat_enable_trace_generation' right after calling 'picosat_init'. + * + * TODO: using these functions in incremental mode with failed assumptions + * has only been tested for 'picosat_corelit' thoroughly. The others may + * only work in non-incremental mode or without using 'picosat_assume'. + */ + +/* This function determines whether the i'th added original clause is in the + * core. The 'i' is the return value of 'picosat_add', which starts at zero + * and is incremented by one after a original clause is added (that is after + * 'picosat_add (0)'). For the index 'i' the following has to hold: + * + * 0 <= i < picosat_added_original_clauses () + */ +int picosat_coreclause (int i); + +/* This function gives access to the variable core, which is made up of the + * variables that were resolved in deriving the empty clauses. + */ +int picosat_corelit (int lit); + +/* Write the clauses that were used in deriving the empty clause to a file + * in DIMACS format. + */ +void picosat_write_clausal_core (FILE * core_file); + +/* Write a proof trace in TraceCheck format to a file. + */ +void picosat_write_compact_trace (FILE * trace_file); +void picosat_write_extended_trace (FILE * trace_file); + +/* Write a RUP trace to a file. This trace file contains only the learned + * core clauses while this is not necessarily the case for the RUP file + * obtained with 'picosat_set_incremental_rup_file'. + */ +void picosat_write_rup_trace (FILE * trace_file); + +/*------------------------------------------------------------------------*/ +/* Keeping the proof trace around is not necessary if an over-approximation + * of the core is enough. A literal is 'used' if it was involved in a + * resolution to derive a learned clause. The core literals are necessarily + * a subset of the 'used' literals. + */ + +int picosat_usedlit (int lit); +/*------------------------------------------------------------------------*/ +#endif + +#ifdef __cplusplus +} +#endif /* extern "C" */ diff --git a/src/prop/bvpicosat/version.c b/src/prop/bvpicosat/version.c new file mode 100644 index 000000000..71c322bd7 --- /dev/null +++ b/src/prop/bvpicosat/version.c @@ -0,0 +1,14 @@ +#include "config.h" + +const char * +picosat_version (void) +{ + return PICOSAT_VERSION; +} + +const char * +picosat_config (void) +{ + return PICOSAT_CC " " PICOSAT_CFLAGS; +} + |