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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Aina Niemetz |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Implementation of first order model for full model check. |
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*/ |
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#include "theory/quantifiers/fmf/first_order_model_fmc.h" |
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#include "expr/attribute.h" |
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#include "expr/skolem_manager.h" |
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#include "theory/quantifiers/fmf/full_model_check.h" |
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#include "theory/rewriter.h" |
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using namespace cvc5::kind; |
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namespace cvc5 { |
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namespace theory { |
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namespace quantifiers { |
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namespace fmcheck { |
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/** |
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* Marks that a term represents the entire domain of quantified formula for |
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* the finite model finding fmc algorithm. |
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*/ |
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struct IsStarAttributeId |
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{ |
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}; |
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using IsStarAttribute = expr::Attribute<IsStarAttributeId, bool>; |
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FirstOrderModelFmc::FirstOrderModelFmc(QuantifiersState& qs, |
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QuantifiersRegistry& qr, |
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TermRegistry& tr) |
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: FirstOrderModel(qs, qr, tr) |
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{ |
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} |
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FirstOrderModelFmc::~FirstOrderModelFmc() |
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{ |
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for (std::pair<const Node, Def*>& d : d_models) |
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{ |
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delete d.second; |
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} |
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} |
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void FirstOrderModelFmc::processInitialize(bool ispre) |
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{ |
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if (!ispre) |
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{ |
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return; |
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} |
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for (std::pair<const Node, Def*>& d : d_models) |
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{ |
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d.second->reset(); |
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} |
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} |
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void FirstOrderModelFmc::processInitializeModelForTerm(Node n) |
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{ |
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if (n.getKind() == APPLY_UF) |
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{ |
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// cannot be a bound variable |
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Node op = n.getOperator(); |
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if (op.getKind() != BOUND_VARIABLE) |
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{ |
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if (d_models.find(op) == d_models.end()) |
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{ |
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d_models[op] = new Def; |
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} |
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} |
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} |
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} |
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bool FirstOrderModelFmc::isStar(Node n) |
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{ |
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return n.getAttribute(IsStarAttribute()); |
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} |
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Node FirstOrderModelFmc::getStar(TypeNode tn) |
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{ |
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std::map<TypeNode, Node>::iterator it = d_type_star.find(tn); |
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if (it != d_type_star.end()) |
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{ |
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return it->second; |
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} |
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SkolemManager* sm = NodeManager::currentNM()->getSkolemManager(); |
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Node st = |
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sm->mkDummySkolem("star", tn, "skolem created for full-model checking"); |
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d_type_star[tn] = st; |
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st.setAttribute(IsStarAttribute(), true); |
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return st; |
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} |
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Node FirstOrderModelFmc::getFunctionValue(Node op, const char* argPrefix) |
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{ |
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Trace("fmc-model") << "Get function value for " << op << std::endl; |
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NodeManager* nm = NodeManager::currentNM(); |
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TypeNode type = op.getType(); |
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std::vector<Node> vars; |
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for (size_t i = 0, nargs = type.getNumChildren() - 1; i < nargs; i++) |
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{ |
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std::stringstream ss; |
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ss << argPrefix << (i + 1); |
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Node b = nm->mkBoundVar(ss.str(), type[i]); |
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vars.push_back(b); |
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} |
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Node boundVarList = nm->mkNode(BOUND_VAR_LIST, vars); |
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Node curr; |
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Def* odef = d_models[op]; |
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for (size_t i = 0, ncond = odef->d_cond.size(); i < ncond; i++) |
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{ |
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size_t ii = (ncond - 1) - i; |
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Node v = odef->d_value[ii]; |
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Trace("fmc-model-func") << "Value is : " << v << std::endl; |
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Assert(v.isConst()); |
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if (curr.isNull()) |
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{ |
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Trace("fmc-model-func") << "base : " << v << std::endl; |
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curr = v; |
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} |
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else |
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{ |
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// make the condition |
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Node cond = odef->d_cond[ii]; |
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Trace("fmc-model-func") << "...cond : " << cond << std::endl; |
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std::vector<Node> children; |
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for (size_t j = 0, nchild = cond.getNumChildren(); j < nchild; j++) |
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{ |
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TypeNode tn = vars[j].getType(); |
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if (!isStar(cond[j])) |
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{ |
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Node c = getRepresentative(cond[j]); |
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c = getRepresentative(c); |
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children.push_back(nm->mkNode(EQUAL, vars[j], c)); |
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} |
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} |
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Assert(!children.empty()); |
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Node cc = nm->mkAnd(children); |
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Trace("fmc-model-func") |
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<< "condition : " << cc << ", value : " << v << std::endl; |
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curr = nm->mkNode(ITE, cc, v, curr); |
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} |
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} |
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Trace("fmc-model") << "Made " << curr << " for " << op << std::endl; |
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curr = Rewriter::rewrite(curr); |
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return nm->mkNode(LAMBDA, boundVarList, curr); |
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} |
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} // namespace fmcheck |
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} // namespace quantifiers |
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} // namespace theory |
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} // namespace cvc5 |