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259 lines
9.1 KiB
259 lines
9.1 KiB
// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
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package org.jetbrains.java.decompiler.modules.decompiler.vars;
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import org.jetbrains.java.decompiler.code.CodeConstants;
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import org.jetbrains.java.decompiler.main.DecompilerContext;
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import org.jetbrains.java.decompiler.modules.decompiler.exps.*;
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import org.jetbrains.java.decompiler.modules.decompiler.sforms.DirectGraph;
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import org.jetbrains.java.decompiler.modules.decompiler.stats.CatchAllStatement;
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import org.jetbrains.java.decompiler.modules.decompiler.stats.CatchStatement;
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import org.jetbrains.java.decompiler.modules.decompiler.stats.RootStatement;
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import org.jetbrains.java.decompiler.modules.decompiler.stats.Statement;
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import org.jetbrains.java.decompiler.struct.StructClass;
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import org.jetbrains.java.decompiler.struct.StructMethod;
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import org.jetbrains.java.decompiler.struct.gen.MethodDescriptor;
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import org.jetbrains.java.decompiler.struct.gen.VarType;
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import java.util.HashMap;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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public class VarTypeProcessor {
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public static final int VAR_NON_FINAL = 1;
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public static final int VAR_EXPLICIT_FINAL = 2;
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public static final int VAR_FINAL = 3;
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private final StructMethod method;
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private final MethodDescriptor methodDescriptor;
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private final Map<VarVersionPair, VarType> mapExprentMinTypes = new HashMap<>();
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private final Map<VarVersionPair, VarType> mapExprentMaxTypes = new HashMap<>();
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private final Map<VarVersionPair, Integer> mapFinalVars = new HashMap<>();
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public VarTypeProcessor(StructMethod mt, MethodDescriptor md) {
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method = mt;
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methodDescriptor = md;
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}
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public void calculateVarTypes(RootStatement root, DirectGraph graph) {
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setInitVars(root);
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resetExprentTypes(graph);
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//noinspection StatementWithEmptyBody
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while (!processVarTypes(graph)) ;
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}
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private void setInitVars(RootStatement root) {
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boolean thisVar = !method.hasModifier(CodeConstants.ACC_STATIC);
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MethodDescriptor md = methodDescriptor;
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if (thisVar) {
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StructClass cl = (StructClass)DecompilerContext.getProperty(DecompilerContext.CURRENT_CLASS);
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VarType clType = new VarType(CodeConstants.TYPE_OBJECT, 0, cl.qualifiedName);
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mapExprentMinTypes.put(new VarVersionPair(0, 1), clType);
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mapExprentMaxTypes.put(new VarVersionPair(0, 1), clType);
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}
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int varIndex = 0;
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for (int i = 0; i < md.params.length; i++) {
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mapExprentMinTypes.put(new VarVersionPair(varIndex + (thisVar ? 1 : 0), 1), md.params[i]);
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mapExprentMaxTypes.put(new VarVersionPair(varIndex + (thisVar ? 1 : 0), 1), md.params[i]);
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varIndex += md.params[i].stackSize;
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}
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// catch variables
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LinkedList<Statement> stack = new LinkedList<>();
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stack.add(root);
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while (!stack.isEmpty()) {
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Statement stat = stack.removeFirst();
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List<VarExprent> lstVars = null;
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if (stat.type == Statement.TYPE_CATCHALL) {
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lstVars = ((CatchAllStatement)stat).getVars();
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}
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else if (stat.type == Statement.TYPE_TRYCATCH) {
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lstVars = ((CatchStatement)stat).getVars();
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}
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if (lstVars != null) {
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for (VarExprent var : lstVars) {
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mapExprentMinTypes.put(new VarVersionPair(var.getIndex(), 1), var.getVarType());
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mapExprentMaxTypes.put(new VarVersionPair(var.getIndex(), 1), var.getVarType());
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}
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}
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stack.addAll(stat.getStats());
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}
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}
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private static void resetExprentTypes(DirectGraph graph) {
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graph.iterateExprents(exprent -> {
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List<Exprent> lst = exprent.getAllExprents(true);
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lst.add(exprent);
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for (Exprent expr : lst) {
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if (expr.type == Exprent.EXPRENT_VAR) {
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((VarExprent)expr).setVarType(VarType.VARTYPE_UNKNOWN);
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}
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else if (expr.type == Exprent.EXPRENT_CONST) {
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ConstExprent constExpr = (ConstExprent)expr;
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if (constExpr.getConstType().typeFamily == CodeConstants.TYPE_FAMILY_INTEGER) {
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constExpr.setConstType(new ConstExprent(constExpr.getIntValue(), constExpr.isBoolPermitted(), null).getConstType());
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}
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}
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}
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return 0;
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});
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}
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private boolean processVarTypes(DirectGraph graph) {
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return graph.iterateExprents(exprent -> checkTypeExprent(exprent) ? 0 : 1);
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}
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private boolean checkTypeExprent(Exprent exprent) {
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for (Exprent expr : exprent.getAllExprents()) {
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if (!checkTypeExprent(expr)) {
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return false;
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}
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}
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if (exprent.type == Exprent.EXPRENT_CONST) {
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ConstExprent constExpr = (ConstExprent)exprent;
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if (constExpr.getConstType().typeFamily <= CodeConstants.TYPE_FAMILY_INTEGER) { // boolean or integer
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VarVersionPair pair = new VarVersionPair(constExpr.id, -1);
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if (!mapExprentMinTypes.containsKey(pair)) {
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mapExprentMinTypes.put(pair, constExpr.getConstType());
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}
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}
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}
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CheckTypesResult result = exprent.checkExprTypeBounds();
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boolean res = true;
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if (result != null) {
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for (CheckTypesResult.ExprentTypePair entry : result.getLstMaxTypeExprents()) {
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if (entry.type.typeFamily != CodeConstants.TYPE_FAMILY_OBJECT) {
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changeExprentType(entry.exprent, entry.type, 1);
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}
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}
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for (CheckTypesResult.ExprentTypePair entry : result.getLstMinTypeExprents()) {
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res &= changeExprentType(entry.exprent, entry.type, 0);
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}
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}
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return res;
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}
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private boolean changeExprentType(Exprent exprent, VarType newType, int minMax) {
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boolean res = true;
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switch (exprent.type) {
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case Exprent.EXPRENT_CONST:
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ConstExprent constExpr = (ConstExprent)exprent;
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VarType constType = constExpr.getConstType();
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if (newType.typeFamily > CodeConstants.TYPE_FAMILY_INTEGER || constType.typeFamily > CodeConstants.TYPE_FAMILY_INTEGER) {
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return true;
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}
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else if (newType.typeFamily == CodeConstants.TYPE_FAMILY_INTEGER) {
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VarType minInteger = new ConstExprent((Integer)constExpr.getValue(), false, null).getConstType();
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if (minInteger.isStrictSuperset(newType)) {
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newType = minInteger;
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}
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}
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case Exprent.EXPRENT_VAR:
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VarVersionPair pair = null;
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if (exprent.type == Exprent.EXPRENT_CONST) {
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pair = new VarVersionPair(exprent.id, -1);
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}
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else if (exprent.type == Exprent.EXPRENT_VAR) {
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pair = new VarVersionPair((VarExprent)exprent);
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}
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if (minMax == 0) { // min
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VarType currentMinType = mapExprentMinTypes.get(pair);
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VarType newMinType;
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if (currentMinType == null || newType.typeFamily > currentMinType.typeFamily) {
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newMinType = newType;
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}
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else if (newType.typeFamily < currentMinType.typeFamily) {
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return true;
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}
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else {
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newMinType = VarType.getCommonSupertype(currentMinType, newType);
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}
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mapExprentMinTypes.put(pair, newMinType);
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if (exprent.type == Exprent.EXPRENT_CONST) {
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((ConstExprent)exprent).setConstType(newMinType);
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}
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if (currentMinType != null && (newMinType.typeFamily > currentMinType.typeFamily || newMinType.isStrictSuperset(currentMinType))) {
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return false;
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}
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}
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else { // max
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VarType currentMaxType = mapExprentMaxTypes.get(pair);
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VarType newMaxType;
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if (currentMaxType == null || newType.typeFamily < currentMaxType.typeFamily) {
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newMaxType = newType;
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}
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else if (newType.typeFamily > currentMaxType.typeFamily) {
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return true;
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}
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else {
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newMaxType = VarType.getCommonMinType(currentMaxType, newType);
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}
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mapExprentMaxTypes.put(pair, newMaxType);
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}
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break;
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case Exprent.EXPRENT_ASSIGNMENT:
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return changeExprentType(((AssignmentExprent)exprent).getRight(), newType, minMax);
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case Exprent.EXPRENT_FUNCTION:
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FunctionExprent func = (FunctionExprent)exprent;
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switch (func.getFuncType()) {
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case FunctionExprent.FUNCTION_IIF: // FIXME:
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res = changeExprentType(func.getLstOperands().get(1), newType, minMax) &
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changeExprentType(func.getLstOperands().get(2), newType, minMax);
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break;
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case FunctionExprent.FUNCTION_AND:
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case FunctionExprent.FUNCTION_OR:
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case FunctionExprent.FUNCTION_XOR:
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res = changeExprentType(func.getLstOperands().get(0), newType, minMax) &
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changeExprentType(func.getLstOperands().get(1), newType, minMax);
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break;
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}
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}
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return res;
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}
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public Map<VarVersionPair, VarType> getMapExprentMaxTypes() {
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return mapExprentMaxTypes;
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}
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public Map<VarVersionPair, VarType> getMapExprentMinTypes() {
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return mapExprentMinTypes;
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}
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public Map<VarVersionPair, Integer> getMapFinalVars() {
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return mapFinalVars;
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}
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public void setVarType(VarVersionPair pair, VarType type) {
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mapExprentMinTypes.put(pair, type);
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}
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public VarType getVarType(VarVersionPair pair) {
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return mapExprentMinTypes.get(pair);
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}
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} |