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ConstraintSolver.cpp
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ConstraintSolver.cpp
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/*
* ConstraintSolver.cpp
*
* Created on: Sep 16, 2008
* Author: tdillig
*/
#include "ConstraintSolver.h"
#include "ExistentialEliminator.h"
#include "VariableEliminator.h"
#include "mistral.h"
#include "assert.h"
#include "NormalForm.h"
#include "UniversalInstantiator.h"
#include "Solver.h"
#include "util.h"
#include "EqualityFinder.h"
#include <algorithm>
#include "ClauseSolve.h"
#include "Constraint.h"
#include "term.h"
#include "cnode.h"
#include <map>
#include "ConflictDatabase.h"
#include "MSAFinder.h"
#include "mistral-parser.h"
#define TRUE_ID 1
#define FALSE_ID 0
#define INVALID -1
#include "time.h"
#define DEBUG false
#define SIMPLIFICATION_LEVEL THEORY_SIMPLIFY
#define ELIM_SIMPLIFICATION_LEVEL THEORY_SIMPLIFY
#define KEEP_SIMPLIFIED false
/*
* Remember the constraints that are the "hardest" to solve
*/
#define KEEP_HARDEST_CONSTRAINTS true
#define NUM_HARDEST 5
//#define USE_OLD_ELIMINATOR true
//---------------
ConstraintSolver::ConstraintSolver()
{
clear_local_data();
clear_stats();
}
string ConstraintSolver::stats_to_string()
{
string res = "\n********************\nConstraint Solver stats:\n";
res+= "Num queries: " + int_to_string(num_sat_queries) + "\n";
res+= "Solve time: " +
float_to_string(((double)solve_time) /
((double)CLOCKS_PER_SEC)) + "\n";
res+="Num queries involving background knowledge: " +
int_to_string(num_bg_queries) + "\n";
res+=get_hardest(hardest);
res+="Num Variable Eliminations (overapproximation): " +
int_to_string(num_eliminate_over_queries) + "\n";
res+= "Elimination time: " +
float_to_string(((double)eliminate_over_time) /
((double)CLOCKS_PER_SEC)) + "\n";
res+=get_hardest(hardest_eliminate_overapproximate);
res+="Num Variable Eliminations (underapproximation): " +
int_to_string(num_eliminate_under_queries) + "\n";
res+= "Elimination time: " +
float_to_string(((double)eliminate_under_time) /
((double)CLOCKS_PER_SEC)) + "\n";
res+=get_hardest(hardest_eliminate_underapproximate);
res+="Num EQ find:" +
int_to_string(num_eqs) + "\n";
res+= "EQ time: " +
float_to_string(((double)eq_time) /
((double)CLOCKS_PER_SEC)) + "\n";
res+= "BG simplification time: " +
float_to_string(((double)bg_simp_time) /
((double)CLOCKS_PER_SEC)) + "\n";
return res;
}
string ConstraintSolver::get_hardest(vector<pair<int, string> > & hardest)
{
string res;
if(KEEP_HARDEST_CONSTRAINTS)
{
if(hardest.size() ==0) return res;
set<pair<int, string> > sorted;
sorted.insert(hardest.begin(), hardest.end());
res+= "Top " + int_to_string(hardest.size()) + "\n";
set<pair<int, string> >::reverse_iterator it = sorted.rbegin();
int i=1;
for(; it!= sorted.rend(); it++, i++) {
res+= "(" + int_to_string(i) + ") " + float_to_string((((double)it->first) /
((double)CLOCKS_PER_SEC) )) +" seconds: " + it->second + "\n";
}
}
return res;
}
void ConstraintSolver::clear_stats()
{
/*
* Clear stats
*/
num_sat_queries = 0;
solve_time = 0;
num_bg_queries = 0;
eq_time = 0;
num_eqs = 0;
hardest.clear();
num_eliminate_over_queries = 0;
num_eliminate_under_queries = 0;
eliminate_over_time = 0;
eliminate_under_time = 0;
bg_simp_time = 0;
hardest_eliminate_overapproximate.clear();
hardest_eliminate_underapproximate.clear();
}
void ConstraintSolver::clear_local_data()
{
bg_enabled = true;
constraints.clear();
reverse_constraints.clear();
clear_bg();
CNode *c_false = False::make();
CNode *c_true = True::make();
constraint_type false_c = constraint_type(c_false, c_false);
constraint_type true_c = constraint_type(c_true, c_true);
constraints[FALSE_ID] = false_c;
constraints[TRUE_ID] = true_c;
reverse_constraints[false_c] = FALSE_ID;
reverse_constraints[true_c] = TRUE_ID;
id_count = 2;
}
void ConstraintSolver::clear()
{
CNode::clear();
ConflictDatabase::clear();
clear_local_data();
}
void ConstraintSolver::disable_background()
{
bg_enabled = false;
}
void ConstraintSolver::clear_bg()
{
bg_enabled = true;
general_background = NULL;
background.clear();
bg_keys.clear();
fn_to_qvars.clear();
fn_ids.clear();
bg_false = false;
nc_reps.clear();
sc_reps.clear();
}
CNode* ConstraintSolver::get_nc(c_id& id)
{
return constraints[id].first;
}
CNode* ConstraintSolver::get_sc(c_id& id)
{
return constraints[id].second;
}
c_id ConstraintSolver::make_ncsc(c_id nc_id, c_id sc_id)
{
CNode* nc= constraints[nc_id].first;
CNode* sc = constraints[sc_id].second;
constraint_type ct(nc, sc);
return get_id(ct);
}
c_id ConstraintSolver::nc(c_id id)
{
CNode* nc= constraints[id].first;
constraint_type ct(nc, nc);
return get_id(ct);
}
c_id ConstraintSolver::sc(c_id id)
{
CNode* sc= constraints[id].second;
constraint_type ct(sc, sc);
return get_id(ct);
}
ConstraintSolver::~ConstraintSolver()
{
//CNode::clear();
}
c_id ConstraintSolver::get_true_constraint()
{
return TRUE_ID;
}
c_id ConstraintSolver::get_false_constraint()
{
return FALSE_ID;
}
c_id ConstraintSolver::get_atom(Term* t1, Term* t2, atom_op_type op)
{
CNode* res = NULL;
switch(op)
{
case ATOM_EQ:
{
// swap if t2 is a mod term
if(is_mod_term(t2))
{
Term* temp = t1;
t1 = t2;
t2 = temp;
}
// special case for mod leaves
if(!is_mod_term(t2) && is_valid_mod_term(t1))
{
FunctionTerm* ft = (FunctionTerm*)t1;
Term* arg1 = ft->get_args()[0];
Term* arg2 = ft->get_args()[1];
assert(arg2->get_term_type() == CONSTANT_TERM);
long int k = ((ConstantTerm*) arg2)->get_constant();
res = ModLeaf::make(arg1, k, t2);
}
else res = EqLeaf::make(t1, t2);
break;
}
case ATOM_NEQ:
{
c_id cur_id = get_atom(t1, t2, ATOM_EQ);
CNode* eq = constraints[cur_id].first;
res = Connective::make_not(eq);
break;
}
case ATOM_LT:
{
res = ILPLeaf::make(t1, t2, ILP_LT);
break;
}
case ATOM_LEQ:
{
res = ILPLeaf::make(t1, t2, ILP_LEQ);
break;
}
case ATOM_GT:
{
res = ILPLeaf::make(t1, t2, ILP_GT);
break;
}
case ATOM_GEQ:
{
res = ILPLeaf::make(t1, t2, ILP_GEQ);
break;
}
case ATOM_MOD:
{
assert(t2->type == CONSTANT_TERM);
ConstantTerm* c = (ConstantTerm*)t2;
res = ModLeaf::make(t1, c->get_constant());
break;
}
default:
assert(false);
}
constraint_type ct(res, res);
return get_id(ct);
}
bool ConstraintSolver::is_mod_term(Term* t)
{
if(t->get_term_type() != FUNCTION_TERM) return false;
FunctionTerm* ft = (FunctionTerm*) t;
return(ft->get_name() == "%");
}
bool ConstraintSolver::is_valid_mod_term(Term* t)
{
if(t->get_term_type() != FUNCTION_TERM) return false;
FunctionTerm* ft = (FunctionTerm*) t;
if(ft->get_name() != "%") return false;
const vector<Term*>& args = ft->get_args();
assert(args.size() == 2);
Term* t1 = args[0];
Term* t2 = args[1];
if(t2->get_term_type() != CONSTANT_TERM) return false;
return !is_mod_term(t1);
}
bool ConstraintSolver::is_precise(c_id id) const
{
const constraint_type& ct = constraints.find(id)->second;
return ct.first == ct.second;
}
c_id ConstraintSolver::get_new_id(c_id old_id)
{
constraint_type& ct = constraints[old_id];
c_id id = id_count++;
assert(constraints.count(id) == 0);
constraints[id] = ct;
return id;
}
c_id ConstraintSolver::get_id(constraint_type& c)
{
c_id id = id_count++;
assert(constraints.count(id) == 0);
constraints[id] = c;
reverse_constraints[c] = id;
return id;
}
c_id ConstraintSolver::get_constraint_from_string(string & s)
{
CNode* constraint = parse_constraint(s, NULL);
constraint = is_sat(constraint, SIMPLIFICATION_LEVEL, true);
if(constraint == NULL) return INVALID;
constraint_type ct = constraint_type(constraint, constraint);
return get_id(ct);
}
c_id ConstraintSolver::get_constraint_from_cnode(CNode* n)
{
constraint_type ct = constraint_type(n, n);
return get_id(ct);
}
inline CNode* ConstraintSolver::is_sat(CNode* node,
simplification_level level, bool use_nc, void* _assignments)
{
if(bg_enabled && bg_false) return False::make();
cnode_type t = node->get_type();
if(t == FALSE_NODE || t==TRUE_NODE) return node;
CNode* full_constraint = node;
CNode* assumptions = True::make();
if(bg_enabled && general_background != NULL) {
assumptions = general_background;
full_constraint = Connective::make(AND, general_background,
full_constraint);
}
if(bg_enabled) {
CNode* dependencies = get_background_dependencies(full_constraint,
use_nc);
assumptions = Connective::make(AND, assumptions, dependencies);
}
map<Term*, SatValue>* assignments = (map<Term*, SatValue>*)_assignments;
num_sat_queries++;
if(assumptions->get_type() != TRUE_NODE) num_bg_queries++;
clock_t start, finish;
//cout << "ASSUMPTIONS: " << assumptions->to_string() << endl;
//cout << "Node: " << node->to_string() << endl;
start = clock();
Solver s(node, assumptions, level, assignments);
finish = clock();
CNode * new_node = s.get_result();
int cur_time = finish-start;
solve_time += cur_time;
//cerr << "Cur time: " << ((double)cur_time)/ ((double)CLOCKS_PER_SEC) << endl;
/* if(((double)cur_time)/ ((double)CLOCKS_PER_SEC) > 3) {
cout << "NODE: " << node->to_string() << endl;
cout << "Assumptions: " << assumptions->to_string() << endl;
cout << "Attrributes: " <<
Connective::make(AND, node, assumptions)->get_attribute_constraints()->to_string()
<< endl;
assert(false);
}*/
add_to_hardest(hardest, cur_time, "[S] " + node->to_string()
+ " assumptions: " + assumptions->to_string() + " attributes: " +
node->get_attribute_constraints()->to_string() + "\n Simplification: " +
new_node->to_string());
/*if(((((double)cur_time) /
((double)CLOCKS_PER_SEC) )) > 0.3) {
cout << "Constraint: " << node->to_string() << endl;
cout << "Simplification" << new_node->to_string() << endl;
assert(false);
}*/
return new_node;
}
inline CNode* ConstraintSolver::is_sat(CNode* node, CNode* assumption,
simplification_level level, bool use_nc, void* _assignments)
{
cnode_type t = node->get_type();
if(t == FALSE_NODE || t==TRUE_NODE) return node;
CNode* full_constraint = node;
CNode* assumptions = True::make();
if(bg_enabled) {
if(general_background != NULL) {
assumptions = general_background;
full_constraint = Connective::make(AND, general_background,
full_constraint);
}
CNode* dependencies = get_background_dependencies(full_constraint,
use_nc);
assumptions = Connective::make(AND, assumptions, dependencies);
}
map<Term*, SatValue>* assignments = (map<Term*, SatValue>*)_assignments;
num_sat_queries++;
if(assumptions->get_type() != TRUE_NODE) num_bg_queries++;
clock_t start, finish;
assumptions = Connective::make(AND, assumptions, assumption);
start = clock();
Solver s(node, assumptions, level, assignments);
finish = clock();
CNode * new_node = s.get_result();
int cur_time = finish-start;
solve_time += cur_time;
add_to_hardest(hardest, cur_time, "[S] " + node->to_string()
+ " assumptions: " + assumptions->to_string() + " attributes: " +
node->get_attribute_constraints()->to_string() + "\n Simplification: " +
new_node->to_string());
return new_node;
}
inline CNode* ConstraintSolver::is_valid(CNode* c,simplification_level level)
{
//cout << "Querying validity: " << c->to_string() << endl;
CNode* node = Connective::make_not(c);
CNode* new_node = is_sat(node, level, true);
new_node = Connective::make_not(new_node);
return new_node;
}
void ConstraintSolver::to_dnf(c_id c, set<c_id> & dnf_set)
{
constraint_type& ct = constraints[c];
CNode* cur = ct.first;
assert(cur != NULL);
cur = Connective::make_not(cur);
CNode* cnf = cur->to_cnf();
CNode* dnf = Connective::make_not(cnf);
if(dnf->get_type() != OR)
{
constraint_type ct = constraint_type(dnf, dnf);
c_id res_id = get_id(ct);
dnf_set.insert(res_id);
return;
}
Connective* outer_c = static_cast<Connective*>(dnf);
for(auto it = outer_c->get_operands().begin();
it != outer_c->get_operands().end(); it++)
{
CNode* cur = *it;
constraint_type ct = constraint_type(cur, cur);
c_id res_id = get_id(ct);
dnf_set.insert(res_id);
}
}
bool ConstraintSolver::is_sat(c_id & id)
{
constraint_type& ct = constraints[id];
CNode* cur = ct.first;
assert(cur != NULL);
CNode* new_node = is_sat(cur, SIMPLIFICATION_LEVEL, true);
ct.first = new_node;
if(cur == ct.second)
ct.second = new_node;
return new_node->get_type()!= FALSE_NODE;
}
bool ConstraintSolver::is_sat_discard(c_id & id)
{
constraint_type& ct = constraints[id];
CNode* cur = ct.first;
assert(cur != NULL);
CNode* new_node = is_sat(cur, UNSAT_SIMPLIFY, true);
ct.first = new_node;
if(cur == ct.second)
ct.second = new_node;
return new_node->get_type()!= FALSE_NODE;
}
bool ConstraintSolver::get_assignment(c_id id, map<Term*, SatValue> & assignments)
{
constraint_type& ct = constraints[id];
CNode* cur = ct.first;
assert(cur != NULL);
CNode* new_node = is_sat(cur, UNSAT_SIMPLIFY,
true, &assignments);
if(new_node->get_type() == FALSE_NODE) return false;
cout << "Returning true for: " << cur->to_string() << " assignment size: "
<< assignments.size() << endl;
return true;
}
bool ConstraintSolver::get_assignment(c_id id,
set<pair<string, string> > & assignments)
{
constraint_type& ct = constraints[id];
CNode* cur = ct.first;
assert(cur != NULL);
map<Term*, SatValue> term_assignments;
CNode* new_node = is_sat(cur, UNSAT_SIMPLIFY,
true, &term_assignments);
if(new_node->get_type() == FALSE_NODE) return false;
map<Term*, SatValue>::iterator it = term_assignments.begin();
for(; it != term_assignments.end(); it++)
{
string key = it->first->to_string();
string assignment = it->second.to_string();
assignments.insert(pair<string, string>(key, assignment));
}
return true;
}
string ConstraintSolver::bg_to_string()
{
string res = "";
if(general_background != NULL)
res+= "General background: " + general_background->to_string() + "\n";
map<CNode*, CNode*>::iterator it = nc_reps.begin();
for(; it!= nc_reps.end(); it++)
{
CNode* c = it->first;
CNode* nc = it->second;
assert(sc_reps.count(c) > 0);
CNode* sc = sc_reps[c];
res += c->to_string() + "=>" + nc->to_string() + " \n";
res += sc->to_string() + "=> " + c->to_string() + "\n";
}
return res;
}
c_id ConstraintSolver::get_general_background()
{
if(general_background == NULL) {
return get_true_constraint();
}
constraint_type ct = constraint_type(general_background, general_background);
c_id res_id = get_id(ct);
return res_id;
}
bool ConstraintSolver::is_valid(c_id id)
{
constraint_type& ct = constraints[id];
CNode* c = ct.second;
assert(c!=NULL);
CNode* new_node = is_valid(c, SIMPLIFICATION_LEVEL);
ct.second = new_node;
if(c == ct.first)
ct.first = new_node;
return new_node->get_type() == TRUE_NODE;
}
bool ConstraintSolver::is_valid_discard(c_id id)
{
constraint_type& ct = constraints[id];
CNode* c = ct.second;
assert(c!=NULL);
CNode* new_node = is_valid(c, UNSAT_SIMPLIFY);
ct.second = new_node;
if(c == ct.first)
ct.first = new_node;
return new_node->get_type() == TRUE_NODE;
}
bool ConstraintSolver::implies(c_id id1, c_id id2)
{
CNode* c1 = constraints[id1].first;
CNode* c2 = constraints[id2].second;
assert(c1!=NULL && c2!=NULL);
CNode* c_not = Connective::make_not(c1);
CNode* res = Connective::make(OR, c_not, c2);
res = is_valid(res, UNSAT_SIMPLIFY);
return res->get_type() == TRUE_NODE;
}
bool ConstraintSolver::implies(CNode* n1, CNode* n2)
{
CNode* c_not = Connective::make_not(n1);
CNode* res = Connective::make(OR, c_not, n2);
res = Connective::make_not(res);
Solver s(res, UNSAT_SIMPLIFY);
return s.get_result()->get_type() == FALSE_NODE;
}
c_id ConstraintSolver::and_constraint(c_id id1, c_id id2)
{
constraint_type& ct1 = constraints[id1];
constraint_type& ct2 = constraints[id2];
CNode* c1_nc = ct1.first;
CNode* c1_sc = ct1.second;
CNode* c2_nc = ct2.first;
CNode* c2_sc = ct2.second;
assert(c1_nc!=NULL && c1_sc!=NULL && c2_nc!=NULL && c2_sc != NULL);
//CNode *_res_nc = Connective::make(AND, c1_nc, c2_nc);
//CNode *_res_sc = Connective::make(AND, c1_sc, c2_sc);
if(KEEP_SIMPLIFIED) {
assert(false);
}
CNode *res_nc = Connective::make(AND, c1_nc, c2_nc)->refactor();
CNode *res_sc = Connective::make(AND, c1_sc, c2_sc)->refactor();
constraint_type ct = constraint_type(res_nc, res_sc);
c_id res_id = get_id(ct);
return res_id;
}
c_id ConstraintSolver::or_constraint(c_id id1, c_id id2)
{
constraint_type& ct1 = constraints[id1];
constraint_type& ct2 = constraints[id2];
CNode* c1_nc = ct1.first;
CNode* c1_sc = ct1.second;
CNode* c2_nc = ct2.first;
CNode* c2_sc = ct2.second;
assert(c1_nc!=NULL && c1_sc!=NULL && c2_nc!=NULL && c2_sc != NULL);
CNode *res_nc = Connective::make(OR, c1_nc, c2_nc)->refactor();
CNode *res_sc = Connective::make(OR, c1_sc, c2_sc)->refactor();
constraint_type ct = constraint_type(res_nc, res_sc);
c_id res_id = get_id(ct);
return res_id;
}
c_id ConstraintSolver::not_constraint(c_id id)
{
constraint_type& _ct = constraints[id];
CNode* c_nc = _ct.first;
CNode* c_sc = _ct.second;
assert(c_nc!=NULL && c_sc != NULL);
CNode *res_nc = Connective::make_not(c_sc);
CNode *res_sc = Connective::make_not(c_nc);
constraint_type ct(res_nc, res_sc);
return get_id(ct);
}
string ConstraintSolver::constraint_to_string(c_id id)
{
constraint_type& ct = constraints[id];
CNode* cur_nc = ct.first;
CNode* cur_sc = ct.second;
assert(cur_nc != NULL && cur_sc != NULL);
string nc_str = cur_nc->to_string();
if(cur_nc == cur_sc)
return nc_str;
return "(" + nc_str + ", " +
cur_sc->to_string() + ")";
}
bool ConstraintSolver::contains_inequality(c_id id)
{
constraint_type& ct = constraints[id];
CNode* nc = ct.first;
return nc->contains_inequality();
}
bool ConstraintSolver::is_equal(c_id id1, c_id id2)
{
if(id1 == id2) return true;
constraint_type& ct1 = constraints[id1];
constraint_type& ct2 = constraints[id2];
return implies(ct1.first, ct2.first) && implies(ct1.second, ct2.second);
}
bool ConstraintSolver::is_equivalent(c_id id1, c_id id2)
{
return implies(id1, id2) && implies(id2, id1);
}
void ConstraintSolver::get_terms(c_id id, set<Term*>& terms,
bool include_nested_terms)
{
constraint_type& ct = constraints[id];
CNode* nc = ct.first;
CNode* sc = ct.second;
assert(nc != NULL && sc != NULL);
nc->get_nested_terms(terms, include_nested_terms, true);
if(sc!=nc) sc->get_nested_terms(terms, include_nested_terms, true);
}
void ConstraintSolver::find_equalities(c_id id, Term* t, set<Term*> & eqs)
{
constraint_type& ct = constraints[id];
CNode * cur_nc = ct.first;
assert(cur_nc != NULL);
EqualityFinder ef(cur_nc, t, false);
eqs = ef.get_equalities();
}
Term* ConstraintSolver::find_equality(c_id id, Term* t)
{
constraint_type& ct = constraints[id];
CNode * cur_nc = ct.first;
assert(cur_nc != NULL);
EqualityFinder ef(cur_nc, t, false);
const set<Term*> & eqs = ef.get_equalities();
if(eqs.size() == 0) return NULL;
Term* new_t = *eqs.begin();
term_type new_type = new_t->get_term_type();
// Always favor constants and variables over other kinds of terms
if(new_type != CONSTANT_TERM && new_type != VARIABLE_TERM)
{
set<Term*>::const_iterator it = eqs.begin();
it++;
for(; it!= eqs.end(); it++){
Term* cur = *it;
term_type tt = cur->get_term_type();
if(tt == CONSTANT_TERM || tt==VARIABLE_TERM) {
new_t = cur;
break;
}
}
}
return new_t;
}
bool ConstraintSolver::has_equality_relation(c_id id, Term* t1, Term* t2)
{
constraint_type& ct = constraints[id];
CNode * cur_nc = ct.first;
assert(cur_nc != NULL);
EqualityFinder ef(cur_nc, t1, false);
const set<Term*> & eqs = ef.get_equalities();
set<Term*>::iterator it = eqs.begin();
for(; it!= eqs.end(); it++) {
Term* cur = *it;
if(cur == t2) return true;
if(cur->get_term_type() != ARITHMETIC_TERM) continue;
ArithmeticTerm* at = (ArithmeticTerm*) cur;
const map<Term*, long int>& elems = at->get_elems();
map<Term*, long int>::const_iterator it2 = elems.begin();
for(; it2!= elems.end(); it2++){
Term* cur_t = it2->first;
if(cur_t == t2) return true;
}
}
return false;
}
void ConstraintSolver::get_disjunctive_equalities(c_id id, Term* t,
map<Term*, Constraint> & equalities)
{
constraint_type& ct = constraints[id];
CNode * cur_nc = ct.first;
assert(cur_nc != NULL);
EqualityFinder ef(cur_nc, t, true);
const map<Term*, CNode*> & eqs = ef.get_disjunctive_equalities();
map<Term*, CNode*>::const_iterator it = eqs.begin();
for(; it != eqs.end(); it++)
{
Term* t = it->first;
CNode* c = it->second;
constraint_type ct(c, c);
c_id new_id = get_id(ct);
Constraint res_c;
res_c.id = new_id;
equalities[t] = res_c;
}
}
CNode* ConstraintSolver::eliminate_var(CNode* n, VariableTerm* t,
simplification_level level, bool over)
{
int start = clock();
#ifdef USE_OLD_ELIMINATOR
VariableEliminator elim(n, t, THEORY_SIMPLIFY, over);
#endif
#ifndef USE_OLD_ELIMINATOR
ExistentialEliminator elim(n, t, over);
#endif
//delete me
//VariableEliminator elim2(n, t, THEORY_SIMPLIFY, over);
//delete me end
int end = clock();
int time = end-start;
string var = t->to_string();
if(over)
{
num_eliminate_over_queries++;
eliminate_over_time+=time;
add_to_hardest(hardest_eliminate_overapproximate, time, n->to_string() +
" : " +var);
}
else
{
num_eliminate_under_queries++;
eliminate_under_time+=time;
add_to_hardest(hardest_eliminate_underapproximate, time, n->to_string() +
" : " +var);
}
CNode* res= elim.get_result();
//delete me
/*
CNode* res2 = elim2.get_result();
CNode* r1 = Connective::make(AND, res, Connective::make_not(res2));
CNode* r2 = Connective::make(AND, res2, Connective::make_not(res));
CNode* e1 = is_sat(r1, UNSAT_SIMPLIFY, true);
CNode* e2 = is_sat(r2, UNSAT_SIMPLIFY, true);
if(e1->get_type() != FALSE_NODE ||e2->get_type() != FALSE_NODE)
{
cout << "NOt equal:" << n->to_string() << endl;
cout << "elim: " << t->to_string() << endl;
cout << "new res: " << res->to_string() << endl;
cout << "old res: " << res2->to_string() << endl;
assert(false);
}
*/
//delete me end
return res;
}
CNode* ConstraintSolver::eliminate_var(CNode* n, vector<VariableTerm*>& elim_t,
simplification_level level, bool over)
{
string vars = "( ";
for(unsigned int i=0; i < elim_t.size(); i++)
{
vars+= elim_t[i]->to_string();
if(i < elim_t.size() - 1) vars+=", ";
}
vars+=" )";
int start = clock();
//cout << "Eliminating " << vars
// << " in " <<n->to_string() << endl;
CNode* res = n;
#ifdef USE_OLD_ELIMINATOR
VariableEliminator ve(res, elim_t, THEORY_SIMPLIFY, over);
res = ve.get_result();
#endif
#ifndef USE_OLD_ELIMINATOR
for(vector<VariableTerm*>::iterator it = elim_t.begin();
it != elim_t.end(); it++)
{
VariableTerm* cur = *it;
ExistentialEliminator elim(res, cur, over);
res = elim.get_result();
}
#endif
//cout << "Finished" << endl;
int end = clock();
int time = end-start;
if(over)
{
num_eliminate_over_queries++;
eliminate_over_time+=time;
add_to_hardest(hardest_eliminate_overapproximate, time,
n->to_string() + ": " + vars);
}
else
{
num_eliminate_under_queries++;
eliminate_under_time+=time;
add_to_hardest(hardest_eliminate_underapproximate, time,
n->to_string() + ": " + vars);
}
return res;
}
void ConstraintSolver::add_to_hardest(vector<pair<int, string> > & hardest,
int cur_time, const string& cur)
{
if(!KEEP_HARDEST_CONSTRAINTS || cur_time == 0) return;
/* if(((((double)cur_time) /
((double)CLOCKS_PER_SEC) )) > 0.25) {