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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Andres Noetzli, Mathias Preiner |
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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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* Remove ITEs from the assertions. |
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* |
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* [[ Add lengthier description here ]] |
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* \todo document this file |
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*/ |
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#include "preprocessing/passes/ite_removal.h" |
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#include "options/smt_options.h" |
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#include "preprocessing/assertion_pipeline.h" |
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#include "preprocessing/preprocessing_pass_context.h" |
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#include "prop/prop_engine.h" |
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#include "theory/rewriter.h" |
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#include "theory/theory_preprocessor.h" |
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namespace cvc5 { |
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namespace preprocessing { |
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namespace passes { |
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using namespace cvc5::theory; |
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// TODO (project #42): note this preprocessing pass is deprecated |
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IteRemoval::IteRemoval(PreprocessingPassContext* preprocContext) |
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: PreprocessingPass(preprocContext, "ite-removal") |
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{ |
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} |
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PreprocessingPassResult IteRemoval::applyInternal(AssertionPipeline* assertions) |
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{ |
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d_preprocContext->spendResource(Resource::PreprocessStep); |
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IteSkolemMap& imap = assertions->getIteSkolemMap(); |
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// Remove all of the ITE occurrences and normalize |
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prop::PropEngine* pe = d_preprocContext->getPropEngine(); |
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for (unsigned i = 0, size = assertions->size(); i < size; ++i) |
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{ |
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Node assertion = (*assertions)[i]; |
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std::vector<theory::TrustNode> newAsserts; |
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std::vector<Node> newSkolems; |
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TrustNode trn = pe->removeItes(assertion, newAsserts, newSkolems); |
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if (!trn.isNull()) |
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{ |
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// process |
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assertions->replaceTrusted(i, trn); |
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} |
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Assert(newSkolems.size() == newAsserts.size()); |
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for (unsigned j = 0, nnasserts = newAsserts.size(); j < nnasserts; j++) |
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{ |
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imap[assertions->size()] = newSkolems[j]; |
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assertions->pushBackTrusted(newAsserts[j]); |
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} |
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} |
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for (unsigned i = 0, size = assertions->size(); i < size; ++i) |
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{ |
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assertions->replace(i, Rewriter::rewrite((*assertions)[i])); |
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} |
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return PreprocessingPassResult::NO_CONFLICT; |
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} |
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} // namespace passes |
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} // namespace preprocessing |
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} // namespace cvc5 |