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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Mathias Preiner, 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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* Utility for processing single invocation synthesis conjectures. |
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*/ |
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#include "theory/quantifiers/sygus/template_infer.h" |
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#include "expr/skolem_manager.h" |
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#include "options/quantifiers_options.h" |
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#include "theory/quantifiers/sygus/sygus_grammar_cons.h" |
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#include "theory/quantifiers/sygus/sygus_utils.h" |
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#include "theory/quantifiers/term_util.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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void SygusTemplateInfer::initialize(Node q) |
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{ |
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Assert(d_quant.isNull()); |
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Assert(q.getKind() == FORALL); |
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d_quant = q; |
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// We are processing without single invocation techniques, now check if |
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// we should fix an invariant template (post-condition strengthening or |
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// pre-condition weakening). |
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options::SygusInvTemplMode tmode = options::sygusInvTemplMode(); |
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if (tmode != options::SygusInvTemplMode::NONE) |
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{ |
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// currently only works for single predicate synthesis |
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if (q[0].getNumChildren() > 1 || !q[0][0].getType().isPredicate()) |
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{ |
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tmode = options::SygusInvTemplMode::NONE; |
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} |
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else if (!options::sygusInvTemplWhenSyntax()) |
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{ |
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// only use invariant templates if no syntactic restrictions |
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if (CegGrammarConstructor::hasSyntaxRestrictions(q)) |
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{ |
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tmode = options::SygusInvTemplMode::NONE; |
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} |
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} |
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} |
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if (tmode == options::SygusInvTemplMode::NONE) |
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{ |
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// not processing invariant templates |
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return; |
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} |
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Node qq; |
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if (q[1].getKind() == NOT && q[1][0].getKind() == FORALL) |
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{ |
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qq = q[1][0][1]; |
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} |
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else |
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{ |
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qq = TermUtil::simpleNegate(q[1]); |
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} |
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if (qq.isConst()) |
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{ |
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// trivial, do not use transition inference |
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return; |
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} |
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// if we are doing invariant templates, then construct the template |
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Trace("sygus-si") << "- Do transition inference..." << std::endl; |
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d_ti.process(qq, q[0][0]); |
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Trace("cegqi-inv") << std::endl; |
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Node prog = d_ti.getFunction(); |
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if (!d_ti.isComplete()) |
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{ |
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// the invariant could not be inferred |
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return; |
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} |
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Assert(prog == q[0][0]); |
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NodeManager* nm = NodeManager::currentNM(); |
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SkolemManager* sm = nm->getSkolemManager(); |
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// map the program back via non-single invocation map |
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std::vector<Node> prog_templ_vars; |
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d_ti.getVariables(prog_templ_vars); |
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d_trans_pre[prog] = d_ti.getPreCondition(); |
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d_trans_post[prog] = d_ti.getPostCondition(); |
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Trace("cegqi-inv") << " precondition : " << d_trans_pre[prog] << std::endl; |
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Trace("cegqi-inv") << " postcondition : " << d_trans_post[prog] << std::endl; |
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// construct template argument |
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TypeNode atn = prog.getType(); |
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if (atn.isFunction()) |
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{ |
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atn = atn.getRangeType(); |
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} |
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d_templ_arg[prog] = sm->mkDummySkolem("I", atn); |
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// construct template |
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Node templ; |
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if (options::sygusInvAutoUnfold()) |
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{ |
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if (d_ti.isComplete()) |
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{ |
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Trace("cegqi-inv-auto-unfold") |
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<< "Automatic deterministic unfolding... " << std::endl; |
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// auto-unfold |
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DetTrace dt; |
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int init_dt = d_ti.initializeTrace(dt); |
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if (init_dt == 0) |
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{ |
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Trace("cegqi-inv-auto-unfold") << " Init : "; |
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dt.print("cegqi-inv-auto-unfold"); |
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Trace("cegqi-inv-auto-unfold") << std::endl; |
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unsigned counter = 0; |
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unsigned status = 0; |
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while (counter < 100 && status == 0) |
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{ |
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status = d_ti.incrementTrace(dt); |
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counter++; |
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Trace("cegqi-inv-auto-unfold") << " #" << counter << " : "; |
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dt.print("cegqi-inv-auto-unfold"); |
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Trace("cegqi-inv-auto-unfold") |
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<< "...status = " << status << std::endl; |
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} |
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if (status == 1) |
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{ |
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// we have a trivial invariant |
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templ = d_ti.constructFormulaTrace(dt); |
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Trace("cegqi-inv") << "By finite deterministic terminating trace, a " |
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"solution invariant is : " |
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<< std::endl; |
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Trace("cegqi-inv") << " " << templ << std::endl; |
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// this should be unnecessary |
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templ = nm->mkNode(AND, templ, d_templ_arg[prog]); |
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} |
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} |
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else |
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{ |
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Trace("cegqi-inv-auto-unfold") << "...failed initialize." << std::endl; |
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} |
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} |
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} |
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Trace("cegqi-inv") << "Make the template... " << tmode << " " << templ |
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<< std::endl; |
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if (templ.isNull()) |
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{ |
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if (tmode == options::SygusInvTemplMode::PRE) |
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{ |
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templ = nm->mkNode(OR, d_trans_pre[prog], d_templ_arg[prog]); |
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} |
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else |
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{ |
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Assert(tmode == options::SygusInvTemplMode::POST); |
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templ = nm->mkNode(AND, d_trans_post[prog], d_templ_arg[prog]); |
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} |
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} |
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Trace("cegqi-inv") << " template (pre-substitution) : " << templ |
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<< std::endl; |
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Assert(!templ.isNull()); |
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// get the variables |
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Node sfvl = SygusUtils::getSygusArgumentListForSynthFun(prog); |
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if (!sfvl.isNull()) |
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{ |
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std::vector<Node> prog_vars(sfvl.begin(), sfvl.end()); |
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// subsitute the template arguments |
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Trace("cegqi-inv") << "vars : " << prog_templ_vars << " " << prog_vars |
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<< std::endl; |
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Assert(prog_templ_vars.size() == prog_vars.size()); |
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templ = templ.substitute(prog_templ_vars.begin(), |
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prog_templ_vars.end(), |
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prog_vars.begin(), |
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prog_vars.end()); |
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} |
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Trace("cegqi-inv") << " template : " << templ << std::endl; |
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d_templ[prog] = templ; |
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} |
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Node SygusTemplateInfer::getTemplate(Node prog) const |
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{ |
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std::map<Node, Node>::const_iterator tmpl = d_templ.find(prog); |
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if (tmpl != d_templ.end()) |
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{ |
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return tmpl->second; |
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} |
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return Node::null(); |
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} |
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Node SygusTemplateInfer::getTemplateArg(Node prog) const |
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{ |
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std::map<Node, Node>::const_iterator tmpla = d_templ_arg.find(prog); |
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if (tmpla != d_templ_arg.end()) |
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{ |
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return tmpla->second; |
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} |
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return Node::null(); |
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} |
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} // namespace quantifiers |
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} // namespace theory |
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} // namespace cvc5 |