1 /* Copyright (c) 2015 Regents of the University of California
3 * Author: Brian Demsky <bdemsky@uci.edu>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * version 2 as published by the Free Software Foundation.
10 #include "inc_solver.h"
11 #define SATSOLVER "sat_solver"
15 IncrementalSolver * allocIncrementalSolver() {
16 IncrementalSolver *This=(IncrementalSolver *)ourmalloc(sizeof(IncrementalSolver));
17 This->buffer=((int *)ourmalloc(sizeof(int)*IS_BUFFERSIZE));
25 void deleteIncrementalSolver(IncrementalSolver * This) {
27 ourfree(This->buffer);
28 if (This->solution != NULL)
29 ourfree(This->solution);
32 void resetSolver(IncrementalSolver * This) {
38 void addClauseLiteral(IncrementalSolver * This, int literal) {
39 This->buffer[This->offset++]=literal;
40 if (This->offset==IS_BUFFERSIZE) {
41 flushBufferSolver(This);
45 void finishedClauses(IncrementalSolver * This) {
46 addClauseLiteral(This, 0);
49 void freeze(IncrementalSolver * This, int variable) {
50 addClauseLiteral(This, IS_FREEZE);
51 addClauseLiteral(This, variable);
54 int solve(IncrementalSolver * This) {
57 return getSolution(This);
61 void startSolve(IncrementalSolver *This) {
62 addClauseLiteral(This, IS_RUNSOLVER);
63 flushBufferSolver(This);
66 int getSolution(IncrementalSolver * This) {
67 int result=readIntSolver(This);
68 if (result == IS_SAT) {
69 int numVars=readIntSolver(This);
70 if (numVars > This->solutionsize) {
71 if (This->solution != NULL)
72 ourfree(This->solution);
73 This->solution = (int *) ourmalloc((numVars+1)*sizeof(int));
74 This->solution[0] = 0;
76 readSolver(This, &This->solution[1], numVars * sizeof(int));
81 int readIntSolver(IncrementalSolver * This) {
83 readSolver(This, &value, 4);
87 void readSolver(IncrementalSolver * This, void * tmp, ssize_t size) {
88 char *result = (char *) tmp;
89 ssize_t bytestoread=size;
92 ssize_t n=read(This->from_solver_fd, &((char *)result)[bytesread], bytestoread);
94 model_print("Read failure\n");
99 } while(bytestoread != 0);
102 bool getValueSolver(IncrementalSolver * This, int variable) {
103 return This->solution[variable];
106 void createSolver(IncrementalSolver * This) {
109 if (pipe(to_pipe) || pipe(from_pipe)) {
110 model_print("Error creating pipe.\n");
113 if ((This->solver_pid = fork()) == -1) {
114 model_print("Error forking.\n");
117 if (This->solver_pid == 0) {
121 int fd=open("log_file", O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU);
123 if ((dup2(to_pipe[0], 0) == -1) ||
124 (dup2(from_pipe[1], IS_OUT_FD) == -1) ||
125 (dup2(fd, 1) == -1)) {
126 model_print("Error duplicating pipes\n");
129 execlp(SATSOLVER, SATSOLVER, NULL);
130 model_print("execlp Failed\n");
134 This->to_solver_fd = to_pipe[1];
135 This->from_solver_fd = from_pipe[0];
141 void killSolver(IncrementalSolver * This) {
142 close(This->to_solver_fd);
143 close(This->from_solver_fd);
145 if (This->solver_pid > 0) {
147 kill(This->solver_pid, SIGKILL);
148 waitpid(This->solver_pid, &status, 0);
152 void flushBufferSolver(IncrementalSolver * This) {
153 ssize_t bytestowrite=sizeof(int)*This->offset;
154 ssize_t byteswritten=0;
156 ssize_t n=write(This->to_solver_fd, &((char *)This->buffer)[byteswritten], bytestowrite);
158 perror("Write failure\n");
159 model_print("to_solver_fd=%d\n",This->to_solver_fd);
164 } while(bytestowrite != 0);