212 lines
9.2 KiB
C++
212 lines
9.2 KiB
C++
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/*****************************************************************************************[Main.cc]
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Copyright (c) 2003-2006, Niklas Een, Niklas Sorensson
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Copyright (c) 2007, Niklas Sorensson
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
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associated documentation files (the "Software"), to deal in the Software without restriction,
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including without limitation the rights to use, copy, modify, merge, publish, distribute,
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sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or
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substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
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NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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**************************************************************************************************/
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#include <errno.h>
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#include <signal.h>
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#include <zlib.h>
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#include <sys/resource.h>
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#include "utils/System.h"
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#include "utils/ParseUtils.h"
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#include "utils/Options.h"
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#include "core/Dimacs.h"
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#include "simp/SimpSolver.h"
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using namespace Minisat;
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//=================================================================================================
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void printStats(Solver& solver)
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{
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double cpu_time = cpuTime();
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double mem_used = memUsedPeak();
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printf("restarts : %"PRIu64"\n", solver.starts);
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printf("conflicts : %-12"PRIu64" (%.0f /sec)\n", solver.conflicts , solver.conflicts /cpu_time);
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printf("decisions : %-12"PRIu64" (%4.2f %% random) (%.0f /sec)\n", solver.decisions, (float)solver.rnd_decisions*100 / (float)solver.decisions, solver.decisions /cpu_time);
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printf("propagations : %-12"PRIu64" (%.0f /sec)\n", solver.propagations, solver.propagations/cpu_time);
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printf("conflict literals : %-12"PRIu64" (%4.2f %% deleted)\n", solver.tot_literals, (solver.max_literals - solver.tot_literals)*100 / (double)solver.max_literals);
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if (mem_used != 0) printf("Memory used : %.2f MB\n", mem_used);
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printf("CPU time : %g s\n", cpu_time);
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}
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static Solver* solver;
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// Terminate by notifying the solver and back out gracefully. This is mainly to have a test-case
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// for this feature of the Solver as it may take longer than an immediate call to '_exit()'.
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static void SIGINT_interrupt(int signum) { solver->interrupt(); }
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// Note that '_exit()' rather than 'exit()' has to be used. The reason is that 'exit()' calls
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// destructors and may cause deadlocks if a malloc/free function happens to be running (these
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// functions are guarded by locks for multithreaded use).
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static void SIGINT_exit(int signum) {
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printf("\n"); printf("*** INTERRUPTED ***\n");
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if (solver->verbosity > 0){
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printStats(*solver);
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printf("\n"); printf("*** INTERRUPTED ***\n"); }
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_exit(1); }
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//=================================================================================================
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// Main:
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int main(int argc, char** argv)
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{
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try {
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setUsageHelp("USAGE: %s [options] <input-file> <result-output-file>\n\n where input may be either in plain or gzipped DIMACS.\n");
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// printf("This is MiniSat 2.0 beta\n");
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#if defined(__linux__)
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fpu_control_t oldcw, newcw;
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_FPU_GETCW(oldcw); newcw = (oldcw & ~_FPU_EXTENDED) | _FPU_DOUBLE; _FPU_SETCW(newcw);
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printf("WARNING: for repeatability, setting FPU to use double precision\n");
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#endif
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// Extra options:
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//
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IntOption verb ("MAIN", "verb", "Verbosity level (0=silent, 1=some, 2=more).", 1, IntRange(0, 2));
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BoolOption pre ("MAIN", "pre", "Completely turn on/off any preprocessing.", true);
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StringOption dimacs ("MAIN", "dimacs", "If given, stop after preprocessing and write the result to this file.");
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IntOption cpu_lim("MAIN", "cpu-lim","Limit on CPU time allowed in seconds.\n", INT32_MAX, IntRange(0, INT32_MAX));
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IntOption mem_lim("MAIN", "mem-lim","Limit on memory usage in megabytes.\n", INT32_MAX, IntRange(0, INT32_MAX));
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parseOptions(argc, argv, true);
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SimpSolver S;
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double initial_time = cpuTime();
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if (!pre) S.eliminate(true);
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S.verbosity = verb;
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solver = &S;
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// Use signal handlers that forcibly quit until the solver will be able to respond to
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// interrupts:
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signal(SIGINT, SIGINT_exit);
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signal(SIGXCPU,SIGINT_exit);
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// Set limit on CPU-time:
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if (cpu_lim != INT32_MAX){
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rlimit rl;
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getrlimit(RLIMIT_CPU, &rl);
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if (rl.rlim_max == RLIM_INFINITY || (rlim_t)cpu_lim < rl.rlim_max){
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rl.rlim_cur = cpu_lim;
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if (setrlimit(RLIMIT_CPU, &rl) == -1)
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printf("WARNING! Could not set resource limit: CPU-time.\n");
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} }
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// Set limit on virtual memory:
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if (mem_lim != INT32_MAX){
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rlim_t new_mem_lim = (rlim_t)mem_lim * 1024*1024;
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rlimit rl;
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getrlimit(RLIMIT_AS, &rl);
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if (rl.rlim_max == RLIM_INFINITY || new_mem_lim < rl.rlim_max){
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rl.rlim_cur = new_mem_lim;
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if (setrlimit(RLIMIT_AS, &rl) == -1)
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printf("WARNING! Could not set resource limit: Virtual memory.\n");
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} }
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if (argc == 1)
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printf("Reading from standard input... Use '--help' for help.\n");
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gzFile in = (argc == 1) ? gzdopen(0, "rb") : gzopen(argv[1], "rb");
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if (in == NULL)
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printf("ERROR! Could not open file: %s\n", argc == 1 ? "<stdin>" : argv[1]), exit(1);
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if (S.verbosity > 0){
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printf("============================[ Problem Statistics ]=============================\n");
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printf("| |\n"); }
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parse_DIMACS(in, S);
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gzclose(in);
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FILE* res = (argc >= 3) ? fopen(argv[2], "wb") : NULL;
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if (S.verbosity > 0){
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printf("| Number of variables: %12d |\n", S.nVars());
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printf("| Number of clauses: %12d |\n", S.nClauses()); }
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double parsed_time = cpuTime();
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if (S.verbosity > 0)
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printf("| Parse time: %12.2f s |\n", parsed_time - initial_time);
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// Change to signal-handlers that will only notify the solver and allow it to terminate
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// voluntarily:
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signal(SIGINT, SIGINT_interrupt);
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signal(SIGXCPU,SIGINT_interrupt);
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S.eliminate(true);
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double simplified_time = cpuTime();
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if (S.verbosity > 0){
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printf("| Simplification time: %12.2f s |\n", simplified_time - parsed_time);
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printf("| |\n"); }
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if (!S.okay()){
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if (res != NULL) fprintf(res, "UNSAT\n"), fclose(res);
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if (S.verbosity > 0){
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printf("===============================================================================\n");
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printf("Solved by simplification\n");
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printStats(S);
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printf("\n"); }
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printf("UNSATISFIABLE\n");
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exit(20);
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}
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if (dimacs){
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if (S.verbosity > 0)
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printf("==============================[ Writing DIMACS ]===============================\n");
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S.toDimacs((const char*)dimacs);
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if (S.verbosity > 0)
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printStats(S);
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exit(0);
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}
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vec<Lit> dummy;
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lbool ret = S.solveLimited(dummy);
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if (S.verbosity > 0){
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printStats(S);
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printf("\n"); }
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printf(ret == l_True ? "SATISFIABLE\n" : ret == l_False ? "UNSATISFIABLE\n" : "INDETERMINATE\n");
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if (res != NULL){
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if (ret == l_True){
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fprintf(res, "SAT\n");
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for (int i = 0; i < S.nVars(); i++)
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if (S.model[i] != l_Undef)
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fprintf(res, "%s%s%d", (i==0)?"":" ", (S.model[i]==l_True)?"":"-", i+1);
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fprintf(res, " 0\n");
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}else if (ret == l_False)
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fprintf(res, "UNSAT\n");
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else
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fprintf(res, "INDET\n");
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fclose(res);
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}
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#ifdef NDEBUG
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exit(ret == l_True ? 10 : ret == l_False ? 20 : 0); // (faster than "return", which will invoke the destructor for 'Solver')
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#else
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return (ret == l_True ? 10 : ret == l_False ? 20 : 0);
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#endif
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} catch (OutOfMemoryException&){
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printf("===============================================================================\n");
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printf("INDETERMINATE\n");
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exit(0);
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}
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}
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