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111
key.core/src/main/java/de/uka/ilkd/key/rule/conditions/NewLocalVarsCondition.java
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| @@ -0,0 +1,111 @@ | ||
| /* This file is part of KeY - https://key-project.org | ||
| * KeY is licensed under the GNU General Public License Version 2 | ||
| * SPDX-License-Identifier: GPL-2.0-only */ | ||
| package de.uka.ilkd.key.rule.conditions; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
|
|
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| import de.uka.ilkd.key.java.ProgramElement; | ||
| import de.uka.ilkd.key.java.Services; | ||
| import de.uka.ilkd.key.java.Statement; | ||
| import de.uka.ilkd.key.java.abstraction.ArrayType; | ||
| import de.uka.ilkd.key.java.abstraction.KeYJavaType; | ||
| import de.uka.ilkd.key.java.declaration.LocalVariableDeclaration; | ||
| import de.uka.ilkd.key.java.declaration.VariableDeclaration; | ||
| import de.uka.ilkd.key.java.declaration.VariableSpecification; | ||
| import de.uka.ilkd.key.java.reference.TypeRef; | ||
| import de.uka.ilkd.key.logic.Term; | ||
| import de.uka.ilkd.key.logic.op.LocationVariable; | ||
| import de.uka.ilkd.key.logic.op.SchemaVariable; | ||
| import de.uka.ilkd.key.rule.MatchConditions; | ||
| import de.uka.ilkd.key.rule.VariableCondition; | ||
| import de.uka.ilkd.key.rule.inst.ProgramList; | ||
| import de.uka.ilkd.key.rule.inst.SVInstantiations; | ||
| import de.uka.ilkd.key.util.MiscTools; | ||
|
|
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| import org.key_project.logic.SyntaxElement; | ||
| import org.key_project.util.collection.*; | ||
|
|
||
| /** | ||
| * For the loop scope rule, if a local program variable that may be altered by the loop body appears | ||
| * in the frame condition, | ||
| * it is necessary to use the value <i>before</i> the loop first executes in the frame condition. | ||
| * <br> | ||
| * To achieve this, this condition generates (1) the "before" version of each variable that may be | ||
| * written to by the loop | ||
| * {@link MiscTools#getLocalOuts(ProgramElement, Services)}; (2) an update storing the value of each | ||
| * such PV in its "before" version, | ||
| * i.e., {@code {...||i_before := i||...}}; (3) the reverse of the update, to be applied to the | ||
| * frame condition, i.e., | ||
| * {@code {...||i := i_before||...}}. | ||
| */ | ||
| public class NewLocalVarsCondition implements VariableCondition { | ||
| /** | ||
| * A SV that will store variable declarations for the "before" version of variables. | ||
| */ | ||
| private final SchemaVariable varDeclsSV; | ||
| /** | ||
| * Will store the update {@code {...||i_before := i||...}}. | ||
| */ | ||
| private final SchemaVariable updateBeforeSV; | ||
| /** | ||
| * Will store the update {@code {...||i := i_before||...}}. | ||
| */ | ||
| private final SchemaVariable updateFrameSV; | ||
| /** | ||
| * The loop body. | ||
| */ | ||
| private final SchemaVariable bodySV; | ||
|
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| public NewLocalVarsCondition(SchemaVariable varDeclsSV, SchemaVariable updateBeforeSV, | ||
| SchemaVariable updateFrameSV, SchemaVariable bodySV) { | ||
| this.varDeclsSV = varDeclsSV; | ||
| this.updateBeforeSV = updateBeforeSV; | ||
| this.updateFrameSV = updateFrameSV; | ||
| this.bodySV = bodySV; | ||
| } | ||
|
|
||
| @Override | ||
| public MatchConditions check(SchemaVariable var, SyntaxElement instCandidate, | ||
| MatchConditions matchCond, Services services) { | ||
| SVInstantiations svInst = matchCond.getInstantiations(); | ||
| if (svInst.getInstantiation(varDeclsSV) != null) { | ||
| return matchCond; | ||
| } | ||
| var body = (Statement) svInst.getInstantiation(bodySV); | ||
| if (body == null) { | ||
| return matchCond; | ||
| } | ||
|
|
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| var vars = MiscTools.getLocalOuts(body, services); | ||
| List<VariableDeclaration> decls = new ArrayList<>(vars.size()); | ||
| ImmutableList<Term> updatesBefore = ImmutableSLList.nil(); | ||
| ImmutableList<Term> updatesFrame = ImmutableSLList.nil(); | ||
| var tb = services.getTermBuilder(); | ||
| for (var v : vars) { | ||
| final var newName = | ||
| services.getVariableNamer().getTemporaryNameProposal(v.name() + "_before"); | ||
| KeYJavaType type = v.getKeYJavaType(); | ||
| var locVar = new LocationVariable(newName, type); | ||
| var spec = new VariableSpecification(locVar); | ||
| int dim = 0; | ||
| if (type.getJavaType() instanceof ArrayType at) { | ||
| dim = at.getDimension(); | ||
| } | ||
| decls.add(new LocalVariableDeclaration(new TypeRef(type, dim), spec)); | ||
| updatesBefore = updatesBefore.append(tb.elementary(tb.var(locVar), tb.var(v))); | ||
| updatesFrame = updatesFrame.append(tb.elementary(tb.var(v), tb.var(locVar))); | ||
| } | ||
| return matchCond.setInstantiations( | ||
| svInst.add(varDeclsSV, new ProgramList(new ImmutableArray<>(decls)), services) | ||
| .add(updateBeforeSV, tb.parallel(updatesBefore), services) | ||
| .add(updateFrameSV, tb.parallel(updatesFrame), services)); | ||
| } | ||
|
|
||
| @Override | ||
| public String toString() { | ||
| return "\\newLocalVars(" + varDeclsSV + ", " + updateBeforeSV + ", " + updateFrameSV + ", " | ||
| + bodySV + ")"; | ||
| } | ||
| } |
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