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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Haniel Barbosa, Diego Della Rocca de Camargos |
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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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* The proof manager of the SMT engine. |
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*/ |
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#include "smt/proof_manager.h" |
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#include "options/base_options.h" |
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#include "options/main_options.h" |
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#include "options/proof_options.h" |
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#include "options/smt_options.h" |
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#include "proof/alethe/alethe_node_converter.h" |
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#include "proof/alethe/alethe_post_processor.h" |
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#include "proof/dot/dot_printer.h" |
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#include "proof/lfsc/lfsc_post_processor.h" |
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#include "proof/lfsc/lfsc_printer.h" |
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#include "proof/proof_checker.h" |
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#include "proof/proof_node_algorithm.h" |
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#include "proof/proof_node_manager.h" |
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#include "smt/assertions.h" |
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#include "smt/difficulty_post_processor.h" |
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#include "smt/env.h" |
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#include "smt/preprocess_proof_generator.h" |
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#include "smt/proof_post_processor.h" |
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namespace cvc5 { |
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namespace smt { |
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PfManager::PfManager(Env& env) |
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: EnvObj(env), |
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d_pchecker(new ProofChecker( |
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options().proof.proofCheck == options::ProofCheckMode::EAGER, |
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options().proof.proofPedantic)), |
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d_pnm(new ProofNodeManager(env.getRewriter(), d_pchecker.get())), |
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d_pppg(new PreprocessProofGenerator( |
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d_pnm.get(), env.getUserContext(), "smt::PreprocessProofGenerator")), |
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d_pfpp(nullptr), |
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d_finalProof(nullptr) |
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{ |
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// enable proof support in the environment/rewriter |
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d_env.setProofNodeManager(d_pnm.get()); |
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// Now, initialize the proof postprocessor with the environment. |
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// By default the post-processor will update all assumptions, which |
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// can lead to SCOPE subproofs of the form |
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// A |
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// ... |
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// B1 B2 |
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// ... ... |
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// ------------ |
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// C |
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// ------------- SCOPE [B1, B2] |
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// B1 ^ B2 => C |
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// |
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// where A is an available assumption from outside the scope (note |
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// that B1 was an assumption of this SCOPE subproof but since it could |
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// be inferred from A, it was updated). This shape is problematic for |
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// the Alethe reconstruction, so we disable the update of scoped |
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// assumptions (which would disable the update of B1 in this case). |
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d_pfpp.reset(new ProofPostproccess( |
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env, |
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d_pppg.get(), |
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nullptr, |
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options().proof.proofFormatMode != options::ProofFormatMode::ALETHE)); |
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// add rules to eliminate here |
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if (options().proof.proofGranularityMode |
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!= options::ProofGranularityMode::OFF) |
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{ |
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d_pfpp->setEliminateRule(PfRule::MACRO_SR_EQ_INTRO); |
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d_pfpp->setEliminateRule(PfRule::MACRO_SR_PRED_INTRO); |
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d_pfpp->setEliminateRule(PfRule::MACRO_SR_PRED_ELIM); |
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d_pfpp->setEliminateRule(PfRule::MACRO_SR_PRED_TRANSFORM); |
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d_pfpp->setEliminateRule(PfRule::MACRO_RESOLUTION_TRUST); |
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d_pfpp->setEliminateRule(PfRule::MACRO_RESOLUTION); |
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d_pfpp->setEliminateRule(PfRule::MACRO_ARITH_SCALE_SUM_UB); |
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if (options().proof.proofGranularityMode |
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!= options::ProofGranularityMode::REWRITE) |
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{ |
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d_pfpp->setEliminateRule(PfRule::SUBS); |
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d_pfpp->setEliminateRule(PfRule::REWRITE); |
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if (options().proof.proofGranularityMode |
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!= options::ProofGranularityMode::THEORY_REWRITE) |
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{ |
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// this eliminates theory rewriting steps with finer-grained DSL rules |
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d_pfpp->setEliminateRule(PfRule::THEORY_REWRITE); |
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} |
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} |
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// theory-specific lazy proof reconstruction |
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d_pfpp->setEliminateRule(PfRule::STRING_INFERENCE); |
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d_pfpp->setEliminateRule(PfRule::BV_BITBLAST); |
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} |
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d_false = NodeManager::currentNM()->mkConst(false); |
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} |
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PfManager::~PfManager() {} |
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void PfManager::setFinalProof(std::shared_ptr<ProofNode> pfn, Assertions& as) |
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{ |
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// Note this assumes that setFinalProof is only called once per unsat |
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// response. This method would need to cache its result otherwise. |
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Trace("smt-proof") << "SolverEngine::setFinalProof(): get proof body...\n"; |
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if (Trace.isOn("smt-proof-debug")) |
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{ |
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Trace("smt-proof-debug") |
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<< "SolverEngine::setFinalProof(): Proof node for false:\n"; |
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Trace("smt-proof-debug") << *pfn.get() << std::endl; |
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Trace("smt-proof-debug") << "=====" << std::endl; |
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} |
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std::vector<Node> assertions; |
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getAssertions(as, assertions); |
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if (Trace.isOn("smt-proof")) |
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{ |
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Trace("smt-proof") |
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<< "SolverEngine::setFinalProof(): get free assumptions..." |
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<< std::endl; |
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std::vector<Node> fassumps; |
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expr::getFreeAssumptions(pfn.get(), fassumps); |
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Trace("smt-proof") |
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<< "SolverEngine::setFinalProof(): initial free assumptions are:\n"; |
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for (const Node& a : fassumps) |
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{ |
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Trace("smt-proof") << "- " << a << std::endl; |
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} |
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Trace("smt-proof") << "SolverEngine::setFinalProof(): assertions are:\n"; |
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for (const Node& n : assertions) |
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{ |
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Trace("smt-proof") << "- " << n << std::endl; |
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} |
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Trace("smt-proof") << "=====" << std::endl; |
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} |
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Trace("smt-proof") << "SolverEngine::setFinalProof(): postprocess...\n"; |
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Assert(d_pfpp != nullptr); |
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d_pfpp->process(pfn); |
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Trace("smt-proof") << "SolverEngine::setFinalProof(): make scope...\n"; |
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// Now make the final scope, which ensures that the only open leaves of the |
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// proof are the assertions. |
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d_finalProof = d_pnm->mkScope(pfn, assertions); |
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Trace("smt-proof") << "SolverEngine::setFinalProof(): finished.\n"; |
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} |
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void PfManager::printProof(std::ostream& out, |
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std::shared_ptr<ProofNode> pfn, |
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Assertions& as) |
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{ |
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Trace("smt-proof") << "PfManager::printProof: start" << std::endl; |
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std::shared_ptr<ProofNode> fp = getFinalProof(pfn, as); |
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// if we are in incremental mode, we don't want to invalidate the proof |
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// nodes in fp, since these may be reused in further check-sat calls |
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if (options().base.incrementalSolving |
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&& options().proof.proofFormatMode != options::ProofFormatMode::NONE) |
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{ |
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fp = d_pnm->clone(fp); |
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} |
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// according to the proof format, post process and print the proof node |
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if (options().proof.proofFormatMode == options::ProofFormatMode::DOT) |
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{ |
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proof::DotPrinter dotPrinter; |
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dotPrinter.print(out, fp.get()); |
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} |
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else if (options().proof.proofFormatMode == options::ProofFormatMode::ALETHE) |
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{ |
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proof::AletheNodeConverter anc; |
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proof::AletheProofPostprocess vpfpp(d_pnm.get(), anc); |
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vpfpp.process(fp); |
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} |
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else if (options().proof.proofFormatMode == options::ProofFormatMode::LFSC) |
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{ |
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std::vector<Node> assertions; |
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getAssertions(as, assertions); |
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proof::LfscNodeConverter ltp; |
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proof::LfscProofPostprocess lpp(ltp, d_pnm.get()); |
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lpp.process(fp); |
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proof::LfscPrinter lp(ltp); |
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lp.print(out, assertions, fp.get()); |
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} |
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else if (options().proof.proofFormatMode == options::ProofFormatMode::TPTP) |
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{ |
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out << "% SZS output start Proof for " << options().driver.filename |
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<< std::endl; |
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// TODO (proj #37) print in TPTP compliant format |
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out << *fp << std::endl; |
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out << "% SZS output end Proof for " << options().driver.filename |
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<< std::endl; |
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} |
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else |
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{ |
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// otherwise, print using default printer |
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out << "(proof\n"; |
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out << *fp; |
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out << "\n)\n"; |
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} |
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} |
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void PfManager::checkProof(std::shared_ptr<ProofNode> pfn, Assertions& as) |
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{ |
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Trace("smt-proof") << "PfManager::checkProof: start" << std::endl; |
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std::shared_ptr<ProofNode> fp = getFinalProof(pfn, as); |
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Trace("smt-proof-debug") << "PfManager::checkProof: returned " << *fp.get() |
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<< std::endl; |
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} |
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void PfManager::translateDifficultyMap(std::map<Node, Node>& dmap, |
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Assertions& as) |
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{ |
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Trace("difficulty") << "PfManager::translateDifficultyMap" << std::endl; |
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if (dmap.empty()) |
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{ |
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return; |
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} |
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std::map<Node, Node> dmapp = dmap; |
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dmap.clear(); |
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std::vector<Node> ppAsserts; |
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for (const std::pair<const Node, Node>& ppa : dmapp) |
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{ |
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Trace("difficulty") << " preprocess difficulty: " << ppa.second << " for " |
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<< ppa.first << std::endl; |
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ppAsserts.push_back(ppa.first); |
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} |
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// assume a SAT refutation from all input assertions that were marked |
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// as having a difficulty |
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CDProof cdp(d_pnm.get()); |
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Node fnode = NodeManager::currentNM()->mkConst(false); |
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cdp.addStep(fnode, PfRule::SAT_REFUTATION, ppAsserts, {}); |
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std::shared_ptr<ProofNode> pf = cdp.getProofFor(fnode); |
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std::shared_ptr<ProofNode> fpf = getFinalProof(pf, as); |
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Trace("difficulty-debug") << "Final proof is " << *fpf.get() << std::endl; |
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Assert(fpf->getRule() == PfRule::SCOPE); |
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fpf = fpf->getChildren()[0]; |
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// analyze proof |
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Assert(fpf->getRule() == PfRule::SAT_REFUTATION); |
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const std::vector<std::shared_ptr<ProofNode>>& children = fpf->getChildren(); |
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DifficultyPostprocessCallback dpc; |
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ProofNodeUpdater dpnu(d_pnm.get(), dpc); |
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// For each child of SAT_REFUTATION, we increment the difficulty on all |
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// "source" free assumptions (see DifficultyPostprocessCallback) by the |
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// difficulty of the preprocessed assertion. |
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for (const std::shared_ptr<ProofNode>& c : children) |
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{ |
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Node res = c->getResult(); |
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Assert(dmapp.find(res) != dmapp.end()); |
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Trace("difficulty-debug") << " process: " << res << std::endl; |
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Trace("difficulty-debug") << " .dvalue: " << dmapp[res] << std::endl; |
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Trace("difficulty-debug") << " ..proof: " << *c.get() << std::endl; |
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if (!dpc.setCurrentDifficulty(dmapp[res])) |
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{ |
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continue; |
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} |
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dpnu.process(c); |
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} |
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// get the accumulated difficulty map from the callback |
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dpc.getDifficultyMap(dmap); |
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} |
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ProofChecker* PfManager::getProofChecker() const { return d_pchecker.get(); } |
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ProofNodeManager* PfManager::getProofNodeManager() const { return d_pnm.get(); } |
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rewriter::RewriteDb* PfManager::getRewriteDatabase() const { return nullptr; } |
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smt::PreprocessProofGenerator* PfManager::getPreprocessProofGenerator() const |
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{ |
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return d_pppg.get(); |
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} |
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std::shared_ptr<ProofNode> PfManager::getFinalProof( |
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std::shared_ptr<ProofNode> pfn, Assertions& as) |
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{ |
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setFinalProof(pfn, as); |
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Assert(d_finalProof); |
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return d_finalProof; |
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} |
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void PfManager::getAssertions(Assertions& as, |
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std::vector<Node>& assertions) |
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{ |
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const context::CDList<Node>& al = as.getAssertionList(); |
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Assert(options().smt.produceAssertions) |
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<< "Expected produce assertions to be true when checking proof"; |
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for (const Node& a : al) |
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{ |
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assertions.push_back(a); |
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} |
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} |
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} // namespace smt |
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} // namespace cvc5 |