279 lines
9.8 KiB
Java
279 lines
9.8 KiB
Java
/*
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* Copyright 2000-2014 JetBrains s.r.o.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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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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public class VarTypeProcessor {
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public static final int VAR_NONFINAL = 1;
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public static final int VAR_FINALEXPLICIT = 2;
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public static final int VAR_FINAL = 3;
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private HashMap<VarVersionPaar, VarType> mapExprentMinTypes = new HashMap<VarVersionPaar, VarType>();
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private HashMap<VarVersionPaar, VarType> mapExprentMaxTypes = new HashMap<VarVersionPaar, VarType>();
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private HashMap<VarVersionPaar, Integer> mapFinalVars = new HashMap<VarVersionPaar, Integer>();
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private void setInitVars(RootStatement root) {
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StructMethod mt = (StructMethod)DecompilerContext.getProperty(DecompilerContext.CURRENT_METHOD);
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// method descriptor
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boolean thisvar = (mt.getAccessFlags() & CodeConstants.ACC_STATIC) == 0;
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MethodDescriptor md = (MethodDescriptor)DecompilerContext.getProperty(DecompilerContext.CURRENT_METHOD_DESCRIPTOR);
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if (thisvar) {
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VarType cltype = new VarType(CodeConstants.TYPE_OBJECT, 0,
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((StructClass)DecompilerContext.getProperty(DecompilerContext.CURRENT_CLASS)).qualifiedName);
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mapExprentMinTypes.put(new VarVersionPaar(0, 1), cltype);
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mapExprentMaxTypes.put(new VarVersionPaar(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 VarVersionPaar(varindex + (thisvar ? 1 : 0), 1), md.params[i]);
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mapExprentMaxTypes.put(new VarVersionPaar(varindex + (thisvar ? 1 : 0), 1), md.params[i]);
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varindex += md.params[i].stack_size;
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}
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// catch variables
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LinkedList<Statement> stack = new LinkedList<Statement>();
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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 VarVersionPaar(var.getIndex(), 1), var.getVartype());
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mapExprentMaxTypes.put(new VarVersionPaar(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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public void calculateVarTypes(RootStatement root, DirectGraph dgraph) {
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setInitVars(root);
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resetExprentTypes(dgraph);
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while (!processVarTypes(dgraph)) ;
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}
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private static void resetExprentTypes(DirectGraph dgraph) {
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dgraph.iterateExprents(new DirectGraph.ExprentIterator() {
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public int processExprent(Exprent 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 cexpr = (ConstExprent)expr;
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if (cexpr.getConsttype().type_family == CodeConstants.TYPE_FAMILY_INTEGER) {
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cexpr.setConsttype(new ConstExprent(cexpr.getIntValue(), cexpr.isBoolPermitted()).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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}
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private boolean processVarTypes(DirectGraph dgraph) {
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return dgraph.iterateExprents(new DirectGraph.ExprentIterator() {
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public int processExprent(Exprent exprent) {
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return checkTypeExprent(exprent) ? 0 : 1;
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}
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});
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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 cexpr = (ConstExprent)exprent;
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if (cexpr.getConsttype().type_family <= CodeConstants.TYPE_FAMILY_INTEGER) { // boolean or integer
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VarVersionPaar cpaar = new VarVersionPaar(cexpr.id, -1);
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if (!mapExprentMinTypes.containsKey(cpaar)) {
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mapExprentMinTypes.put(cpaar, cexpr.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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for (CheckTypesResult.ExprentTypePair entry : result.getLstMaxTypeExprents()) {
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if (entry.type.type_family != 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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boolean res = true;
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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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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 cexpr = (ConstExprent)exprent;
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VarType consttype = cexpr.getConsttype();
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if (newtype.type_family > CodeConstants.TYPE_FAMILY_INTEGER || consttype.type_family > CodeConstants.TYPE_FAMILY_INTEGER) {
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return true;
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}
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else if (newtype.type_family == CodeConstants.TYPE_FAMILY_INTEGER) {
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VarType mininteger = new ConstExprent((Integer)((ConstExprent)exprent).getValue(), false).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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VarVersionPaar varpaar = null;
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if (exprent.type == Exprent.EXPRENT_CONST) {
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varpaar = new VarVersionPaar(((ConstExprent)exprent).id, -1);
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}
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else if (exprent.type == Exprent.EXPRENT_VAR) {
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varpaar = new VarVersionPaar((VarExprent)exprent);
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}
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if (minmax == 0) { // min
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VarType currentMinType = mapExprentMinTypes.get(varpaar);
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VarType newMinType;
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if (currentMinType == null || newtype.type_family > currentMinType.type_family) {
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newMinType = newtype;
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}
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else if (newtype.type_family < currentMinType.type_family) {
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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(varpaar, 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.type_family > currentMinType.type_family ||
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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(varpaar);
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VarType newMaxType;
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if (currentMaxType == null || newtype.type_family < currentMaxType.type_family) {
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newMaxType = newtype;
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}
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else if (newtype.type_family > currentMaxType.type_family) {
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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(varpaar, 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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res &= 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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res &= changeExprentType(func.getLstOperands().get(1), newtype, minmax);
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}
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}
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return res;
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}
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public HashMap<VarVersionPaar, VarType> getMapExprentMaxTypes() {
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return mapExprentMaxTypes;
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}
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public HashMap<VarVersionPaar, VarType> getMapExprentMinTypes() {
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return mapExprentMinTypes;
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}
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public HashMap<VarVersionPaar, Integer> getMapFinalVars() {
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return mapFinalVars;
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}
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public void setVarType(VarVersionPaar varpaar, VarType type) {
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mapExprentMinTypes.put(varpaar, type);
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}
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public VarType getVarType(VarVersionPaar varpaar) {
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return mapExprentMinTypes.get(varpaar);
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}
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}
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