/
optimize.cpp
1408 lines (1333 loc) · 54.3 KB
/
optimize.cpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Guido Tack <guido.tack@monash.edu>
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <minizinc/optimize.hh>
#include <minizinc/hash.hh>
#include <minizinc/astiterator.hh>
#include <minizinc/prettyprinter.hh>
#include <minizinc/flatten.hh>
#include <minizinc/flatten_internal.hh>
#include <minizinc/eval_par.hh>
#include <minizinc/optimize_constraints.hh>
#include <vector>
namespace MiniZinc {
void VarOccurrences::add(VarDeclI *i, int idx_i)
{
idx.insert(i->e()->id(), idx_i);
}
void VarOccurrences::add(VarDecl *e, int idx_i)
{
assert(find(e) == -1);
idx.insert(e->id(), idx_i);
}
int VarOccurrences::find(VarDecl* vd)
{
IdMap<int>::iterator it = idx.find(vd->id());
return it==idx.end() ? -1 : it->second;
}
void VarOccurrences::remove(VarDecl *vd)
{
idx.remove(vd->id());
}
void VarOccurrences::add(VarDecl* v, Item* i) {
IdMap<Items>::iterator vi = _m.find(v->id()->decl()->id());
if (vi==_m.end()) {
Items items; items.insert(i);
_m.insert(v->id()->decl()->id(), items);
} else {
vi->second.insert(i);
}
}
int VarOccurrences::remove(VarDecl* v, Item* i) {
IdMap<Items>::iterator vi = _m.find(v->id()->decl()->id());
assert(vi!=_m.end());
vi->second.erase(i);
return vi->second.size();
}
void VarOccurrences::unify(EnvI& env, Model* m, Id* id0_0, Id *id1_0) {
Id* id0 = id0_0->decl()->id();
Id* id1 = id1_0->decl()->id();
VarDecl* v0 = id0->decl();
VarDecl* v1 = id1->decl();
if (v0==v1)
return;
int v0idx = find(v0);
assert(v0idx != -1);
env.flat_removeItem(v0idx);
IdMap<Items>::iterator vi0 = _m.find(v0->id());
if (vi0 != _m.end()) {
IdMap<Items>::iterator vi1 = _m.find(v1->id());
if (vi1 == _m.end()) {
_m.insert(v1->id(), vi0->second);
} else {
vi1->second.insert(vi0->second.begin(), vi0->second.end());
}
_m.remove(v0->id());
}
id0->redirect(id1);
remove(v0);
}
void VarOccurrences::clear(void) {
_m.clear();
idx.clear();
}
int VarOccurrences::occurrences(VarDecl* v) {
IdMap<Items>::iterator vi = _m.find(v->id()->decl()->id());
return (vi==_m.end() ? 0 : vi->second.size());
}
void CollectOccurrencesI::vVarDeclI(VarDeclI* v) {
CollectOccurrencesE ce(vo,v);
topDown(ce,v->e());
}
void CollectOccurrencesI::vConstraintI(ConstraintI* ci) {
CollectOccurrencesE ce(vo,ci);
topDown(ce,ci->e());
for (ExpressionSetIter it = ci->e()->ann().begin(); it != ci->e()->ann().end(); ++it)
topDown(ce, *it);
}
void CollectOccurrencesI::vSolveI(SolveI* si) {
CollectOccurrencesE ce(vo,si);
topDown(ce,si->e());
for (ExpressionSetIter it = si->ann().begin(); it != si->ann().end(); ++si)
topDown(ce,*it);
}
bool isOutput(VarDecl* vd) {
for (ExpressionSetIter it = vd->ann().begin(); it != vd->ann().end(); ++it) {
if (*it) {
if (*it==constants().ann.output_var)
return true;
if (Call* c = (*it)->dyn_cast<Call>()) {
if (c->id() == constants().ann.output_array)
return true;
}
}
}
return false;
}
void unify(EnvI& env, std::vector<VarDecl*>& deletedVarDecls, Id* id0, Id* id1) {
if (id0->decl() != id1->decl()) {
if (isOutput(id0->decl())) {
std::swap(id0,id1);
}
if (id0->decl()->e() != NULL) {
Expression* rhs = id0->decl()->e();
VarDeclI* vdi1 = (*env.flat())[env.vo.find(id1->decl())]->cast<VarDeclI>();
CollectOccurrencesE ce(env.vo, vdi1);
topDown(ce, rhs);
id1->decl()->e(rhs);
id0->decl()->e(NULL);
VarDeclI* vdi0 = (*env.flat())[env.vo.find(id0->decl())]->cast<VarDeclI>();
CollectDecls cd(env.vo, deletedVarDecls, vdi0);
topDown(cd, rhs);
}
// Compute intersection of domains
if (id0->decl()->ti()->domain() != NULL) {
if (id1->decl()->ti()->domain() != NULL) {
if (id0->type().isint() || id0->type().isintset()) {
IntSetVal* isv0 = eval_intset(env,id0->decl()->ti()->domain());
IntSetVal* isv1 = eval_intset(env,id1->decl()->ti()->domain());
IntSetRanges isv0r(isv0);
IntSetRanges isv1r(isv1);
Ranges::Inter<IntSetRanges,IntSetRanges> inter(isv0r,isv1r);
IntSetVal* nd = IntSetVal::ai(inter);
if (nd->size()==0) {
env.flat()->fail(env);
} else if (nd->card() != isv1->card()) {
id1->decl()->ti()->domain(new SetLit(Location(), nd));
if (nd->card()==isv0->card()) {
id1->decl()->ti()->setComputedDomain(id0->decl()->ti()->computedDomain());
} else {
id1->decl()->ti()->setComputedDomain(false);
}
}
} else if (id0->type().isbool()) {
if (eval_bool(env,id0->decl()->ti()->domain()) != eval_bool(env,id1->decl()->ti()->domain())) {
env.flat()->fail(env);
}
} else {
// float
BinOp* dom0 = id0->decl()->ti()->domain()->cast<BinOp>();
BinOp* dom1 = id1->decl()->ti()->domain()->cast<BinOp>();
FloatVal lb0 = dom0->lhs()->cast<FloatLit>()->v();
FloatVal ub0 = dom0->rhs()->cast<FloatLit>()->v();
FloatVal lb1 = dom1->lhs()->cast<FloatLit>()->v();
FloatVal ub1 = dom1->rhs()->cast<FloatLit>()->v();
FloatVal lb = std::max(lb0,lb1);
FloatVal ub = std::min(ub0,ub1);
if (lb != lb1 || ub != ub1) {
BinOp* newdom = new BinOp(Location(), FloatLit::a(lb), BOT_DOTDOT, FloatLit::a(ub));
newdom->type(Type::parsetfloat());
id1->decl()->ti()->domain(newdom);
if (lb==lb0 && ub==ub0) {
id1->decl()->ti()->setComputedDomain(id0->decl()->ti()->computedDomain());
} else {
id1->decl()->ti()->setComputedDomain(false);
}
}
}
} else {
id1->decl()->ti()->domain(id0->decl()->ti()->domain());
}
}
// If both variables are output variables, unify them in the output model
if (isOutput(id0->decl())) {
assert(env.output_vo.find(id0->decl()) != -1);
VarDecl* id0_output = (*env.output)[env.output_vo.find(id0->decl())]->cast<VarDeclI>()->e();
assert(env.output_vo.find(id1->decl()) != -1);
VarDecl* id1_output = (*env.output)[env.output_vo.find(id1->decl())]->cast<VarDeclI>()->e();
if (id0_output->e() == NULL) {
id0_output->e(id1_output->id());
}
}
env.vo.unify(env, env.flat(), id0, id1);
}
}
void substituteFixedVars(EnvI& env, Item* ii, std::vector<VarDecl*>& deletedVarDecls);
void simplifyBoolConstraint(EnvI& env, Item* ii, VarDecl* vd, bool& remove,
std::vector<int>& vardeclQueue,
std::vector<Item*>& constraintQueue,
std::vector<Item*>& toRemove,
UNORDERED_NAMESPACE::unordered_map<Expression*, int>& nonFixedLiteralCount);
bool simplifyConstraint(EnvI& env, Item* ii,
std::vector<VarDecl*>& deletedVarDecls,
std::vector<Item*>& constraintQueue,
std::vector<int>& vardeclQueue);
void pushVarDecl(EnvI& env, VarDeclI* vdi, int vd_idx, std::vector<int>& q) {
if (!vdi->removed() && !vdi->flag()) {
vdi->flag(true);
q.push_back(vd_idx);
}
}
void pushVarDecl(EnvI& env, int vd_idx, std::vector<int>& q) {
pushVarDecl(env, (*env.flat())[vd_idx]->cast<VarDeclI>(), vd_idx, q);
}
void pushDependentConstraints(EnvI& env, Id* id, std::vector<Item*>& q) {
IdMap<VarOccurrences::Items>::iterator it = env.vo._m.find(id->decl()->id());
if (it != env.vo._m.end()) {
for (VarOccurrences::Items::iterator item = it->second.begin(); item != it->second.end(); ++item) {
if (ConstraintI* ci = (*item)->dyn_cast<ConstraintI>()) {
if (!ci->removed() && !ci->flag()) {
ci->flag(true);
q.push_back(ci);
}
} else if (VarDeclI* vdi = (*item)->dyn_cast<VarDeclI>()) {
if (vdi->e()->id()->decl() != vdi->e()) {
vdi = (*env.flat())[env.vo.find(vdi->e()->id()->decl())]->cast<VarDeclI>();
}
if (!vdi->removed() && !vdi->flag() && vdi->e()->e()) {
vdi->flag(true);
q.push_back(vdi);
}
}
}
}
}
void optimize(Env& env) {
EnvI& envi = env.envi();
Model& m = *envi.flat();
std::vector<int> toAssignBoolVars;
std::vector<int> toRemoveConstraints;
std::vector<VarDecl*> deletedVarDecls;
std::vector<Item*> constraintQueue;
std::vector<int> vardeclQueue;
std::vector<int> boolConstraints;
GCLock lock;
for (unsigned int i=0; i<m.size(); i++) {
if (!m[i]->removed()) {
if (ConstraintI* ci = m[i]->dyn_cast<ConstraintI>()) {
ci->flag(false);
} else if (VarDeclI* vdi = m[i]->dyn_cast<VarDeclI>()) {
vdi->flag(false);
}
}
}
for (unsigned int i=0; i<m.size(); i++) {
if (m[i]->removed())
continue;
if (ConstraintI* ci = m[i]->dyn_cast<ConstraintI>()) {
ci->flag(false);
if (!ci->removed()) {
if (Call* c = ci->e()->dyn_cast<Call>()) {
if ( (c->id() == constants().ids.int_.eq || c->id() == constants().ids.bool_eq || c->id() == constants().ids.float_.eq || c->id() == constants().ids.set_eq) &&
c->args()[0]->isa<Id>() && c->args()[1]->isa<Id>() &&
(c->args()[0]->cast<Id>()->decl()->e()==NULL || c->args()[1]->cast<Id>()->decl()->e()==NULL) ) {
unify(envi, deletedVarDecls, c->args()[0]->cast<Id>(), c->args()[1]->cast<Id>());
{
VarDecl* vd = c->args()[0]->cast<Id>()->decl();
int v0idx = envi.vo.find(vd);
pushVarDecl(envi, m[v0idx]->cast<VarDeclI>(), v0idx, vardeclQueue);
}
pushDependentConstraints(envi, c->args()[0]->cast<Id>(), constraintQueue);
CollectDecls cd(envi.vo,deletedVarDecls,ci);
topDown(cd,c);
ci->e(constants().lit_true);
envi.flat_removeItem(i);
} else if (c->id()==constants().ids.forall) {
ArrayLit* al = follow_id(c->args()[0])->cast<ArrayLit>();
for (unsigned int j=al->v().size(); j--;) {
if (Id* id = al->v()[j]->dyn_cast<Id>()) {
if (id->decl()->ti()->domain()==NULL) {
toAssignBoolVars.push_back(envi.vo.idx.find(id->decl()->id())->second);
} else if (id->decl()->ti()->domain() == constants().lit_false) {
env.flat()->fail(env.envi());
id->decl()->e(constants().lit_true);
}
}
}
toRemoveConstraints.push_back(i);
} else if (c->id()==constants().ids.exists || c->id()==constants().ids.clause) {
boolConstraints.push_back(i);
}
} else if (Id* id = ci->e()->dyn_cast<Id>()) {
if (id->decl()->ti()->domain() == constants().lit_false) {
env.flat()->fail(env.envi());
ci->e(constants().lit_false);
} else {
if (id->decl()->ti()->domain()==NULL) {
toAssignBoolVars.push_back(envi.vo.idx.find(id->decl()->id())->second);
}
toRemoveConstraints.push_back(i);
}
}
}
} else if (VarDeclI* vdi = m[i]->dyn_cast<VarDeclI>()) {
vdi->flag(false);
if (vdi->e()->e() && vdi->e()->e()->isa<Id>() && vdi->e()->type().dim()==0) {
Id* id1 = vdi->e()->e()->cast<Id>();
vdi->e()->e(NULL);
unify(envi, deletedVarDecls, vdi->e()->id(), id1);
pushDependentConstraints(envi, id1, constraintQueue);
}
if (vdi->e()->type().isbool() && vdi->e()->type().isvar() && vdi->e()->type().dim()==0
&& (vdi->e()->ti()->domain() == constants().lit_true || vdi->e()->ti()->domain() == constants().lit_false)) {
pushVarDecl(envi, vdi, i, vardeclQueue);
pushDependentConstraints(envi, vdi->e()->id(), constraintQueue);
}
if (Call* c = Expression::dyn_cast<Call>(vdi->e()->e())) {
if (c->id()==constants().ids.forall || c->id()==constants().ids.exists || c->id()==constants().ids.clause) {
boolConstraints.push_back(i);
}
}
if (vdi->e()->type().isint()) {
if ((vdi->e()->e() && vdi->e()->e()->isa<IntLit>()) ||
(vdi->e()->ti()->domain() && vdi->e()->ti()->domain()->isa<SetLit>() &&
vdi->e()->ti()->domain()->cast<SetLit>()->isv()->size()==1 &&
vdi->e()->ti()->domain()->cast<SetLit>()->isv()->min()==vdi->e()->ti()->domain()->cast<SetLit>()->isv()->max())) {
pushVarDecl(envi, vdi, i, vardeclQueue);
pushDependentConstraints(envi, vdi->e()->id(), constraintQueue);
}
}
}
}
for (unsigned int i=boolConstraints.size(); i--;) {
Item* bi = m[boolConstraints[i]];
if (bi->removed())
continue;
Call* c;
if (bi->isa<ConstraintI>()) {
c = bi->cast<ConstraintI>()->e()->dyn_cast<Call>();
} else {
c = bi->cast<VarDeclI>()->e()->e()->dyn_cast<Call>();
}
if (c==NULL)
continue;
bool isConjunction = (c->id() == constants().ids.forall);
bool subsumed = false;
Id* finalId = NULL;
bool finalIdNeg = false;
int idCount = 0;
std::vector<VarDecl*> pos;
std::vector<VarDecl*> neg;
for (unsigned int j=0; j<c->args().size(); j++) {
bool unit = (j==0 ? isConjunction : !isConjunction);
ArrayLit* al = follow_id(c->args()[j])->cast<ArrayLit>();
for (unsigned int k=0; k<al->v().size(); k++) {
if (Id* ident = al->v()[k]->dyn_cast<Id>()) {
if (ident->decl()->ti()->domain() ||
(ident->decl()->e() && ident->decl()->e()->type().ispar()) ) {
bool identValue = ident->decl()->ti()->domain() ?
eval_bool(envi, ident->decl()->ti()->domain()) :
eval_bool(envi, ident->decl()->e());
if (identValue != unit) {
subsumed = true;
goto subsumed_check_done;
}
} else {
idCount++;
finalId = ident;
finalIdNeg = (j==1);
if (j==0)
pos.push_back(ident->decl());
else
neg.push_back(ident->decl());
}
} else {
if (al->v()[k]->cast<BoolLit>()->v()!=unit) {
subsumed = true;
goto subsumed_check_done;
}
}
}
}
if (pos.size() > 0 && neg.size() > 0) {
std::sort(pos.begin(),pos.end());
std::sort(neg.begin(), neg.end());
unsigned int ix=0;
unsigned int iy=0;
for (;;) {
if (pos[ix]==neg[iy]) {
subsumed = true;
break;
}
if (pos[ix] < neg[iy]) {
ix++;
} else {
iy++;
}
if (ix==pos.size() || iy==neg.size())
break;
}
}
subsumed_check_done:
if (subsumed) {
if (isConjunction) {
if (bi->isa<ConstraintI>()) {
env.envi().flat()->fail(env.envi());
} else {
CollectDecls cd(envi.vo,deletedVarDecls,bi);
topDown(cd,bi->cast<VarDeclI>()->e()->e());
bi->cast<VarDeclI>()->e()->ti()->domain(constants().lit_false);
bi->cast<VarDeclI>()->e()->ti()->setComputedDomain(true);
bi->cast<VarDeclI>()->e()->e(constants().lit_false);
pushVarDecl(envi, bi->cast<VarDeclI>(), boolConstraints[i], vardeclQueue);
pushDependentConstraints(envi, bi->cast<VarDeclI>()->e()->id(), constraintQueue);
}
} else {
if (bi->isa<ConstraintI>()) {
CollectDecls cd(envi.vo,deletedVarDecls,bi);
topDown(cd,bi->cast<ConstraintI>()->e());
bi->remove();
} else {
CollectDecls cd(envi.vo,deletedVarDecls,bi);
topDown(cd,bi->cast<VarDeclI>()->e()->e());
bi->cast<VarDeclI>()->e()->ti()->domain(constants().lit_true);
bi->cast<VarDeclI>()->e()->ti()->setComputedDomain(true);
bi->cast<VarDeclI>()->e()->e(constants().lit_true);
pushVarDecl(envi, bi->cast<VarDeclI>(), boolConstraints[i], vardeclQueue);
pushDependentConstraints(envi, bi->cast<VarDeclI>()->e()->id(), constraintQueue);
}
}
}
else if (idCount==1 && bi->isa<ConstraintI>()) {
assert(finalId->decl()->ti()->domain()==NULL);
finalId->decl()->ti()->domain(constants().boollit(!finalIdNeg));
if (finalId->decl()->e()==NULL)
finalId->decl()->e(constants().boollit(!finalIdNeg));
CollectDecls cd(envi.vo,deletedVarDecls,bi);
topDown(cd,bi->cast<ConstraintI>()->e());
bi->remove();
pushVarDecl(envi, envi.vo.idx.find(finalId->decl()->id())->second, vardeclQueue);
pushDependentConstraints(envi, finalId, constraintQueue);
}
}
for (unsigned int i=toAssignBoolVars.size(); i--;) {
if (m[toAssignBoolVars[i]]->removed())
continue;
VarDeclI* vdi = m[toAssignBoolVars[i]]->cast<VarDeclI>();
if (vdi->e()->ti()->domain()==NULL) {
vdi->e()->ti()->domain(constants().lit_true);
pushVarDecl(envi, vdi, toAssignBoolVars[i], vardeclQueue);
pushDependentConstraints(envi, vdi->e()->id(), constraintQueue);
}
}
UNORDERED_NAMESPACE::unordered_map<Expression*, int> nonFixedLiteralCount;
while (!vardeclQueue.empty() || !constraintQueue.empty()) {
while (!vardeclQueue.empty()) {
int var_idx = vardeclQueue.back();
vardeclQueue.pop_back();
m[var_idx]->cast<VarDeclI>()->flag(false);
VarDecl* vd = m[var_idx]->cast<VarDeclI>()->e();
if (vd->type().isbool() && vd->ti()->domain()) {
bool isTrue = vd->ti()->domain() == constants().lit_true;
bool remove = false;
if (vd->e()) {
if (Id* id = vd->e()->dyn_cast<Id>()) {
if (id->decl()->ti()->domain()==NULL) {
id->decl()->ti()->domain(vd->ti()->domain());
pushVarDecl(envi, envi.vo.idx.find(id->decl()->id())->second, vardeclQueue);
} else if (id->decl()->ti()->domain() != vd->ti()->domain()) {
env.flat()->fail(env.envi());
}
remove = true;
} else if (Call* c = vd->e()->dyn_cast<Call>()) {
if (isTrue && c->id()==constants().ids.forall) {
remove = true;
ArrayLit* al = follow_id(c->args()[0])->cast<ArrayLit>();
for (unsigned int i=0; i<al->v().size(); i++) {
if (Id* id = al->v()[i]->dyn_cast<Id>()) {
if (id->decl()->ti()->domain()==NULL) {
id->decl()->ti()->domain(constants().lit_true);
pushVarDecl(envi, envi.vo.idx.find(id->decl()->id())->second, vardeclQueue);
} else if (id->decl()->ti()->domain() == constants().lit_false) {
env.flat()->fail(env.envi());
remove = true;
}
}
}
} else if (!isTrue && (c->id()==constants().ids.exists || c->id()==constants().ids.clause)) {
remove = true;
for (unsigned int i=0; i<c->args().size(); i++) {
bool ispos = i==0;
ArrayLit* al = follow_id(c->args()[i])->cast<ArrayLit>();
for (unsigned int j=0; j<al->v().size(); j++) {
if (Id* id = al->v()[j]->dyn_cast<Id>()) {
if (id->decl()->ti()->domain()==NULL) {
id->decl()->ti()->domain(constants().boollit(!ispos));
pushVarDecl(envi, envi.vo.idx.find(id->decl()->id())->second, vardeclQueue);
} else if (id->decl()->ti()->domain() == constants().boollit(ispos)) {
env.flat()->fail(env.envi());
remove = true;
}
}
}
}
}
}
} else {
remove = true;
}
pushDependentConstraints(envi, vd->id(), constraintQueue);
std::vector<Item*> toRemove;
IdMap<VarOccurrences::Items>::iterator it = envi.vo._m.find(vd->id()->decl()->id());
if (it != envi.vo._m.end()) {
for (VarOccurrences::Items::iterator item = it->second.begin(); item != it->second.end(); ++item) {
if ((*item)->removed())
continue;
if (VarDeclI* vdi = (*item)->dyn_cast<VarDeclI>()) {
if (vdi->e()->e() && vdi->e()->e()->isa<ArrayLit>()) {
IdMap<VarOccurrences::Items>::iterator ait = envi.vo._m.find(vdi->e()->id()->decl()->id());
if (ait != envi.vo._m.end()) {
for (VarOccurrences::Items::iterator aitem = ait->second.begin(); aitem != ait->second.end(); ++aitem) {
simplifyBoolConstraint(envi,*aitem,vd,remove,vardeclQueue,constraintQueue,toRemove,nonFixedLiteralCount);
}
}
continue;
}
}
simplifyBoolConstraint(envi,*item,vd,remove,vardeclQueue,constraintQueue,toRemove,nonFixedLiteralCount);
}
}
for (unsigned int i=toRemove.size(); i--;) {
if (ConstraintI* ci = toRemove[i]->dyn_cast<ConstraintI>()) {
CollectDecls cd(envi.vo,deletedVarDecls,ci);
topDown(cd,ci->e());
envi.flat_removeItem(ci);
} else {
VarDeclI* vdi = toRemove[i]->cast<VarDeclI>();
CollectDecls cd(envi.vo,deletedVarDecls,vdi);
topDown(cd,vdi->e()->e());
vdi->e()->e(NULL);
}
}
if (remove) {
deletedVarDecls.push_back(vd);
} else {
simplifyConstraint(envi,m[var_idx],deletedVarDecls,constraintQueue,vardeclQueue);
}
}
else if (vd->type().isint() && vd->ti()->domain()) {
IntSetVal* isv = eval_intset(envi, vd->ti()->domain());
if (isv->size()==1 && isv->card()==1) {
simplifyConstraint(envi,m[var_idx],deletedVarDecls,constraintQueue,vardeclQueue);
}
}
}
bool handledConstraint = false;
while (!handledConstraint && !constraintQueue.empty()) {
Item* item = constraintQueue.back();
constraintQueue.pop_back();
Call* c;
ArrayLit* al;
if (ConstraintI* ci = item->dyn_cast<ConstraintI>()) {
ci->flag(false);
c = Expression::dyn_cast<Call>(ci->e());
al = NULL;
} else {
item->cast<VarDeclI>()->flag(false);
c = Expression::dyn_cast<Call>(item->cast<VarDeclI>()->e()->e());
al = Expression::dyn_cast<ArrayLit>(item->cast<VarDeclI>()->e()->e());
}
if (al) {
substituteFixedVars(envi, item, deletedVarDecls);
pushDependentConstraints(envi, item->cast<VarDeclI>()->e()->id(), constraintQueue);
} else if (!c || !(c->id()==constants().ids.forall || c->id()==constants().ids.exists ||
c->id()==constants().ids.clause) ) {
substituteFixedVars(envi, item, deletedVarDecls);
handledConstraint = simplifyConstraint(envi,item,deletedVarDecls,constraintQueue,vardeclQueue);
}
}
}
for (unsigned int i=toRemoveConstraints.size(); i--;) {
ConstraintI* ci = m[toRemoveConstraints[i]]->cast<ConstraintI>();
CollectDecls cd(envi.vo,deletedVarDecls,ci);
topDown(cd,ci->e());
envi.flat_removeItem(toRemoveConstraints[i]);
}
for (unsigned int i=boolConstraints.size(); i--;) {
Item* bi = m[boolConstraints[i]];
if (bi->removed())
continue;
Call* c;
std::vector<VarDecl*> removedVarDecls;
if (bi->isa<ConstraintI>()) {
c = bi->cast<ConstraintI>()->e()->dyn_cast<Call>();
} else {
c = Expression::dyn_cast<Call>(bi->cast<VarDeclI>()->e()->e());
}
if (c==NULL)
continue;
bool isConjunction = (c->id() == constants().ids.forall);
bool subsumed = false;
for (unsigned int j=0; j<c->args().size(); j++) {
bool unit = (j==0 ? isConjunction : !isConjunction);
ArrayLit* al = follow_id(c->args()[j])->cast<ArrayLit>();
std::vector<Expression*> compactedAl;
for (unsigned int k=0; k<al->v().size(); k++) {
if (Id* ident = al->v()[k]->dyn_cast<Id>()) {
if (ident->decl()->ti()->domain()) {
if (!(ident->decl()->ti()->domain()==constants().boollit(unit))) {
subsumed = true;
}
removedVarDecls.push_back(ident->decl());
} else {
compactedAl.push_back(ident);
}
} else {
if (al->v()[k]->cast<BoolLit>()->v()!=unit) {
subsumed = true;
}
}
}
if (compactedAl.size() < al->v().size()) {
c->args()[j] = new ArrayLit(al->loc(), compactedAl);
c->args()[j]->type(Type::varbool(1));
}
}
if (subsumed) {
if (isConjunction) {
if (bi->isa<ConstraintI>()) {
env.envi().flat()->fail(env.envi());
} else {
ArrayLit* al = follow_id(c->args()[0])->cast<ArrayLit>();
for (unsigned int j=0; j<al->v().size(); j++) {
removedVarDecls.push_back(al->v()[j]->cast<Id>()->decl());
}
bi->cast<VarDeclI>()->e()->ti()->domain(constants().lit_false);
bi->cast<VarDeclI>()->e()->ti()->setComputedDomain(true);
bi->cast<VarDeclI>()->e()->e(constants().lit_false);
}
} else {
if (bi->isa<ConstraintI>()) {
CollectDecls cd(envi.vo,deletedVarDecls,bi);
topDown(cd,bi->cast<ConstraintI>()->e());
bi->remove();
} else {
CollectDecls cd(envi.vo,deletedVarDecls,bi);
topDown(cd,bi->cast<VarDeclI>()->e()->e());
bi->cast<VarDeclI>()->e()->ti()->domain(constants().lit_true);
bi->cast<VarDeclI>()->e()->ti()->setComputedDomain(true);
bi->cast<VarDeclI>()->e()->e(constants().lit_true);
}
}
}
for (unsigned int j=0; j<removedVarDecls.size(); j++) {
if (env.envi().vo.remove(removedVarDecls[j], bi) == 0) {
if ( (removedVarDecls[j]->e()==NULL || removedVarDecls[j]->ti()->domain()==NULL ||
removedVarDecls[j]->ti()->computedDomain())
&& !isOutput(removedVarDecls[j]) ) {
deletedVarDecls.push_back(removedVarDecls[j]);
}
}
}
if (VarDeclI* vdi = bi->dyn_cast<VarDeclI>()) {
if (envi.vo.occurrences(vdi->e())==0) {
if ( (vdi->e()->e()==NULL || vdi->e()->ti()->domain()==NULL ||
vdi->e()->ti()->computedDomain())
&& !isOutput(vdi->e()) ) {
deletedVarDecls.push_back(vdi->e());
}
}
}
}
while (!deletedVarDecls.empty()) {
VarDecl* cur = deletedVarDecls.back(); deletedVarDecls.pop_back();
if (envi.vo.occurrences(cur) == 0) {
IdMap<int>::iterator cur_idx = envi.vo.idx.find(cur->id());
if (cur_idx != envi.vo.idx.end() && !m[cur_idx->second]->removed()) {
if (isOutput(cur)) {
Expression* val = NULL;
if (cur->type().isbool() && cur->ti()->domain()) {
val = cur->ti()->domain();
} else if (cur->type().isint()) {
if (cur->e() && cur->e()->isa<IntLit>()) {
val = cur->e();
} else if (cur->ti()->domain() && cur->ti()->domain()->isa<SetLit>() &&
cur->ti()->domain()->cast<SetLit>()->isv()->size()==1 &&
cur->ti()->domain()->cast<SetLit>()->isv()->min()==cur->ti()->domain()->cast<SetLit>()->isv()->max()) {
val = IntLit::a(cur->ti()->domain()->cast<SetLit>()->isv()->min());
}
}
if (val) {
VarDecl* vd_out = (*envi.output)[envi.output_vo.find(cur)]->cast<VarDeclI>()->e();
vd_out->e(val);
CollectDecls cd(envi.vo,deletedVarDecls,m[cur_idx->second]->cast<VarDeclI>());
topDown(cd,cur->e());
envi.flat_removeItem(cur_idx->second);
}
} else {
CollectDecls cd(envi.vo,deletedVarDecls,m[cur_idx->second]->cast<VarDeclI>());
topDown(cd,cur->e());
envi.flat_removeItem(cur_idx->second);
}
}
}
}
}
class SubstitutionVisitor : public EVisitor {
protected:
std::vector<VarDecl*> removed;
Expression* subst(Expression* e) {
if (VarDecl* vd = follow_id_to_decl(e)->dyn_cast<VarDecl>()) {
if (vd->type().isbool() && vd->ti()->domain()) {
removed.push_back(vd);
return vd->ti()->domain();
}
if (vd->type().isint()) {
if (vd->e() && vd->e()->isa<IntLit>()) {
removed.push_back(vd);
return vd->e();
}
if (vd->ti()->domain() && vd->ti()->domain()->isa<SetLit>() &&
vd->ti()->domain()->cast<SetLit>()->isv()->size()==1 &&
vd->ti()->domain()->cast<SetLit>()->isv()->min()==vd->ti()->domain()->cast<SetLit>()->isv()->max()) {
removed.push_back(vd);
return IntLit::a(vd->ti()->domain()->cast<SetLit>()->isv()->min());
}
}
}
return e;
}
public:
/// Visit array literal
void vArrayLit(const ArrayLit& al) {
for (unsigned int i=0; i<al.v().size(); i++) {
al.v()[i] = subst(al.v()[i]);
}
}
/// Visit call
void vCall(const Call& c) {
for (unsigned int i=0; i<c.args().size(); i++) {
c.args()[i] = subst(c.args()[i]);
}
}
/// Determine whether to enter node
bool enter(Expression* e) {
return !e->isa<Id>();
}
void remove(EnvI& env, Item* item, std::vector<VarDecl*>& deletedVarDecls) {
for (unsigned int i=0; i<removed.size(); i++) {
removed[i]->ann().remove(constants().ann.is_defined_var);
if (env.vo.remove(removed[i], item) == 0) {
if ( (removed[i]->e()==NULL || removed[i]->ti()->domain()==NULL || removed[i]->ti()->computedDomain())
&& !isOutput(removed[i]) ) {
deletedVarDecls.push_back(removed[i]);
}
}
}
}
};
void substituteFixedVars(EnvI& env, Item* ii, std::vector<VarDecl*>& deletedVarDecls) {
SubstitutionVisitor sv;
if (ConstraintI* ci = ii->dyn_cast<ConstraintI>()) {
topDown(sv, ci->e());
for (ExpressionSetIter it = ci->e()->ann().begin(); it != ci->e()->ann().end(); ++it) {
topDown(sv, *it);
}
} else if (VarDeclI* vdi = ii->dyn_cast<VarDeclI>()) {
topDown(sv, vdi->e());
for (ExpressionSetIter it = vdi->e()->ann().begin(); it != vdi->e()->ann().end(); ++it) {
topDown(sv, *it);
}
} else {
SolveI* si = ii->cast<SolveI>();
topDown(sv, si->e());
for (ExpressionSetIter it = si->ann().begin(); it != si->ann().end(); ++it) {
topDown(sv, *it);
}
}
sv.remove(env, ii, deletedVarDecls);
}
bool simplifyConstraint(EnvI& env, Item* ii,
std::vector<VarDecl*>& deletedVarDecls,
std::vector<Item*>& constraintQueue,
std::vector<int>& vardeclQueue) {
Expression* con_e;
bool is_true;
bool is_false;
if (ConstraintI* ci = ii->dyn_cast<ConstraintI>()) {
con_e = ci->e();
is_true = true;
is_false = false;
} else {
VarDeclI* vdi = ii->cast<VarDeclI>();
con_e = vdi->e()->e();
is_true = (vdi->e()->type().isbool() && vdi->e()->ti()->domain()==constants().lit_true);
is_false = (vdi->e()->type().isbool() && vdi->e()->ti()->domain()==constants().lit_false);
assert(is_true || is_false || !vdi->e()->type().isbool() || vdi->e()->ti()->domain()==NULL);
}
if (Call* c = Expression::dyn_cast<Call>(con_e)) {
if (c->id()==constants().ids.int_.eq || c->id()==constants().ids.bool_eq ||
c->id()==constants().ids.float_.eq) {
if (is_true && c->args()[0]->isa<Id>() && c->args()[1]->isa<Id>() &&
(c->args()[0]->cast<Id>()->decl()->e()==NULL || c->args()[1]->cast<Id>()->decl()->e()==NULL) ) {
unify(env, deletedVarDecls, c->args()[0]->cast<Id>(), c->args()[1]->cast<Id>());
pushDependentConstraints(env, c->args()[0]->cast<Id>(), constraintQueue);
CollectDecls cd(env.vo,deletedVarDecls,ii);
topDown(cd,c);
env.flat_removeItem(ii);
} else if (c->args()[0]->type().ispar() && c->args()[1]->type().ispar()) {
Expression* e0 = eval_par(env,c->args()[0]);
Expression* e1 = eval_par(env,c->args()[1]);
bool is_equal = Expression::equal(e0, e1);
if ((is_true && is_equal) || (is_false && !is_equal)) {
// do nothing
} else if ((is_true && !is_equal) || (is_false && is_equal)) {
env.flat()->fail(env);
} else {
VarDeclI* vdi = ii->cast<VarDeclI>();
CollectDecls cd(env.vo,deletedVarDecls,ii);
topDown(cd,c);
vdi->e()->e(constants().boollit(is_equal));
vdi->e()->ti()->domain(constants().boollit(is_equal));
vdi->e()->ti()->setComputedDomain(true);
pushVarDecl(env, vdi, env.vo.find(vdi->e()), vardeclQueue);
pushDependentConstraints(env, vdi->e()->id(), constraintQueue);
}
if (ii->isa<ConstraintI>()) {
CollectDecls cd(env.vo,deletedVarDecls,ii);
topDown(cd,c);
env.flat_removeItem(ii);
}
} else if (is_true &&
((c->args()[0]->isa<Id>() && c->args()[1]->type().ispar()) ||
(c->args()[1]->isa<Id>() && c->args()[0]->type().ispar())) )
{
Id* ident = c->args()[0]->isa<Id>() ? c->args()[0]->cast<Id>() : c->args()[1]->cast<Id>();
Expression* arg = c->args()[0]->isa<Id>() ? c->args()[1] : c->args()[0];
bool canRemove = false;
TypeInst* ti = ident->decl()->ti();
switch (ident->type().bt()) {
case Type::BT_BOOL:
if (ti->domain() == NULL) {
ti->domain(constants().boollit(eval_bool(env,arg)));
ti->setComputedDomain(false);
canRemove = true;
} else {
if (eval_bool(env,ti->domain())==eval_bool(env,arg)) {
canRemove = true;
} else {
env.flat()->fail(env);
canRemove = true;
}
}
break;
case Type::BT_INT:
{
IntVal d = eval_int(env,arg);
if (ti->domain() == NULL) {
ti->domain(new SetLit(Location().introduce(), IntSetVal::a(d,d)));
ti->setComputedDomain(false);
canRemove = true;
} else {
IntSetVal* isv = eval_intset(env,ti->domain());
if (isv->contains(d)) {
ident->decl()->ti()->domain(new SetLit(Location().introduce(), IntSetVal::a(d,d)));
ident->decl()->ti()->setComputedDomain(false);
canRemove = true;
} else {
env.flat()->fail(env);
canRemove = true;
}
}
}
break;
case Type::BT_FLOAT:
{
if (ti->domain() == NULL) {
ti->domain(new BinOp(Location().introduce(), arg, BOT_DOTDOT, arg));
ti->setComputedDomain(false);
canRemove = true;
} else {
FloatVal value = eval_float(env,arg);
if (LinearTraits<FloatLit>::domain_contains(ti->domain()->cast<BinOp>(), value)) {
ti->domain(new BinOp(Location().introduce(), arg, BOT_DOTDOT, arg));
ti->setComputedDomain(false);
canRemove = true;
} else {
env.flat()->fail(env);
canRemove = true;
}
}
}
break;
default:
break;
}
if (ident->decl()->e()==NULL) {
ident->decl()->e(c->args()[0]->isa<Id>() ? c->args()[1] : c->args()[0]);
ti->setComputedDomain(true);
canRemove = true;
}
if (ident->decl()->e()->isa<Call>())
constraintQueue.push_back((*env.flat())[env.vo.find(ident->decl())]);
pushDependentConstraints(env, ident, constraintQueue);
if (canRemove) {
CollectDecls cd(env.vo,deletedVarDecls,ii);
topDown(cd,c);
env.flat_removeItem(ii);
}
}
} else if ((is_true || is_false) &&
c->id()==constants().ids.int_.le && ((c->args()[0]->isa<Id>() && c->args()[1]->type().ispar()) ||
(c->args()[1]->isa<Id>() && c->args()[0]->type().ispar())) ) {
Id* ident = c->args()[0]->isa<Id>() ? c->args()[0]->cast<Id>() : c->args()[1]->cast<Id>();
Expression* arg = c->args()[0]->isa<Id>() ? c->args()[1] : c->args()[0];
IntSetVal* domain = ident->decl()->ti()->domain() ? eval_intset(env,ident->decl()->ti()->domain()) : NULL;
if (domain) {
BinOpType bot = c->args()[0]->isa<Id>() ? (is_true ? BOT_LQ : BOT_GR) : (is_true ? BOT_GQ: BOT_LE);
IntSetVal* newDomain = LinearTraits<IntLit>::limit_domain(bot, domain, eval_int(env,arg));
ident->decl()->ti()->domain(new SetLit(Location().introduce(), newDomain));
ident->decl()->ti()->setComputedDomain(false);
if (newDomain->min()==newDomain->max()) {
pushDependentConstraints(env, ident, constraintQueue);
}
CollectDecls cd(env.vo,deletedVarDecls,ii);
topDown(cd,c);
env.flat_removeItem(ii);
}
} else if (c->id()==constants().ids.bool2int) {
VarDeclI* vdi = ii->cast<VarDeclI>();
bool fixed = false;
bool b_val = false;
IntSetVal* vdi_dom = NULL;
if (vdi->e()->ti()->domain()) {
vdi_dom = eval_intset(env, vdi->e()->ti()->domain());
if (vdi_dom->max()<0 || vdi_dom->min()>1) {
env.flat()->fail(env);
return true;
}
fixed = vdi_dom->min()==vdi_dom->max();
b_val = (vdi_dom->min() == 1);
}
if (fixed) {
if (c->args()[0]->type().ispar()) {