324 lines
11 KiB
Java
324 lines
11 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.main;
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import org.jetbrains.java.decompiler.code.CodeConstants;
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import org.jetbrains.java.decompiler.main.ClassesProcessor.ClassNode;
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import org.jetbrains.java.decompiler.main.extern.IFernflowerPreferences;
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import org.jetbrains.java.decompiler.main.rels.ClassWrapper;
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import org.jetbrains.java.decompiler.main.rels.MethodWrapper;
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import org.jetbrains.java.decompiler.modules.decompiler.exps.*;
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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.modules.decompiler.vars.VarVersionPaar;
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import org.jetbrains.java.decompiler.struct.StructClass;
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import org.jetbrains.java.decompiler.struct.StructField;
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import org.jetbrains.java.decompiler.util.InterpreterUtil;
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import java.util.ArrayList;
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import java.util.List;
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public class InitializerProcessor {
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public static void extractInitializers(ClassWrapper wrapper) {
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MethodWrapper meth = wrapper.getMethodWrapper("<clinit>", "()V");
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if (meth != null && meth.root != null) { // successfully decompiled static constructor
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extractStaticInitializers(wrapper, meth);
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}
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extractDynamicInitializers(wrapper);
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// required e.g. if anonymous class is being decompiled as a standard one.
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// This can happen if InnerClasses attributes are erased
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liftConstructor(wrapper);
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if (DecompilerContext.getOption(IFernflowerPreferences.HIDE_EMPTY_SUPER)) {
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hideEmptySuper(wrapper);
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}
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}
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private static void liftConstructor(ClassWrapper wrapper) {
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for (MethodWrapper meth : wrapper.getMethods()) {
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if ("<init>".equals(meth.methodStruct.getName()) && meth.root != null) {
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Statement firstdata = findFirstData(meth.root);
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if (firstdata == null) {
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return;
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}
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int index = 0;
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List<Exprent> lstExprents = firstdata.getExprents();
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for (Exprent exprent : lstExprents) {
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int action = 0;
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if (exprent.type == Exprent.EXPRENT_ASSIGNMENT) {
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AssignmentExprent asexpr = (AssignmentExprent)exprent;
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if (asexpr.getLeft().type == Exprent.EXPRENT_FIELD && asexpr.getRight().type == Exprent.EXPRENT_VAR) {
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FieldExprent fexpr = (FieldExprent)asexpr.getLeft();
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if (fexpr.getClassname().equals(wrapper.getClassStruct().qualifiedName)) {
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StructField structField = wrapper.getClassStruct().getField(fexpr.getName(), fexpr.getDescriptor().descriptorString);
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if (structField != null && structField.hasModifier(CodeConstants.ACC_FINAL)) {
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action = 1;
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}
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}
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}
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}
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else if (index > 0 && exprent.type == Exprent.EXPRENT_INVOCATION &&
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isInvocationInitConstructor((InvocationExprent)exprent, meth, wrapper, true)) {
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// this() or super()
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lstExprents.add(0, lstExprents.remove(index));
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action = 2;
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}
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if (action != 1) {
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break;
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}
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index++;
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}
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}
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}
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}
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private static void hideEmptySuper(ClassWrapper wrapper) {
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for (MethodWrapper meth : wrapper.getMethods()) {
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if ("<init>".equals(meth.methodStruct.getName()) && meth.root != null) {
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Statement firstdata = findFirstData(meth.root);
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if (firstdata == null || firstdata.getExprents().isEmpty()) {
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return;
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}
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Exprent exprent = firstdata.getExprents().get(0);
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if (exprent.type == Exprent.EXPRENT_INVOCATION) {
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InvocationExprent invexpr = (InvocationExprent)exprent;
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if (isInvocationInitConstructor(invexpr, meth, wrapper, false) && invexpr.getLstParameters().isEmpty()) {
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firstdata.getExprents().remove(0);
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}
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}
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}
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}
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}
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private static void extractStaticInitializers(ClassWrapper wrapper, MethodWrapper meth) {
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RootStatement root = meth.root;
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StructClass cl = wrapper.getClassStruct();
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Statement firstdata = findFirstData(root);
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if (firstdata != null) {
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while (!firstdata.getExprents().isEmpty()) {
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Exprent exprent = firstdata.getExprents().get(0);
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boolean found = false;
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if (exprent.type == Exprent.EXPRENT_ASSIGNMENT) {
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AssignmentExprent asexpr = (AssignmentExprent)exprent;
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if (asexpr.getLeft().type == Exprent.EXPRENT_FIELD) {
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FieldExprent fexpr = (FieldExprent)asexpr.getLeft();
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if (fexpr.isStatic() && fexpr.getClassname().equals(cl.qualifiedName) &&
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cl.hasField(fexpr.getName(), fexpr.getDescriptor().descriptorString)) {
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if (isExprentIndependent(asexpr.getRight(), meth)) {
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String keyField = InterpreterUtil.makeUniqueKey(fexpr.getName(), fexpr.getDescriptor().descriptorString);
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if (!wrapper.getStaticFieldInitializers().containsKey(keyField)) {
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wrapper.getStaticFieldInitializers().addWithKey(asexpr.getRight(), keyField);
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firstdata.getExprents().remove(0);
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found = true;
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}
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}
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}
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}
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}
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if (!found) {
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break;
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}
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}
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}
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}
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private static void extractDynamicInitializers(ClassWrapper wrapper) {
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StructClass cl = wrapper.getClassStruct();
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boolean isAnonymous = DecompilerContext.getClassProcessor().getMapRootClasses().get(cl.qualifiedName).type == ClassNode.CLASS_ANONYMOUS;
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List<List<Exprent>> lstFirst = new ArrayList<List<Exprent>>();
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List<MethodWrapper> lstMethWrappers = new ArrayList<MethodWrapper>();
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for (MethodWrapper meth : wrapper.getMethods()) {
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if ("<init>".equals(meth.methodStruct.getName()) && meth.root != null) { // successfully decompiled constructor
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Statement firstdata = findFirstData(meth.root);
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if (firstdata == null || firstdata.getExprents().isEmpty()) {
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return;
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}
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lstFirst.add(firstdata.getExprents());
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lstMethWrappers.add(meth);
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Exprent exprent = firstdata.getExprents().get(0);
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if (!isAnonymous) { // FIXME: doesn't make sense
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if (exprent.type != Exprent.EXPRENT_INVOCATION ||
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!isInvocationInitConstructor((InvocationExprent)exprent, meth, wrapper, false)) {
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return;
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}
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}
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}
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}
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if (lstFirst.isEmpty()) {
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return;
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}
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while (true) {
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String fieldWithDescr = null;
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Exprent value = null;
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for (int i = 0; i < lstFirst.size(); i++) {
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List<Exprent> lst = lstFirst.get(i);
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if (lst.size() < (isAnonymous ? 1 : 2)) {
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return;
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}
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Exprent exprent = lst.get(isAnonymous ? 0 : 1);
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boolean found = false;
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if (exprent.type == Exprent.EXPRENT_ASSIGNMENT) {
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AssignmentExprent asexpr = (AssignmentExprent)exprent;
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if (asexpr.getLeft().type == Exprent.EXPRENT_FIELD) {
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FieldExprent fexpr = (FieldExprent)asexpr.getLeft();
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if (!fexpr.isStatic() && fexpr.getClassname().equals(cl.qualifiedName) &&
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cl.hasField(fexpr.getName(), fexpr
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.getDescriptor().descriptorString)) { // check for the physical existence of the field. Could be defined in a superclass.
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if (isExprentIndependent(asexpr.getRight(), lstMethWrappers.get(i))) {
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String fieldKey = InterpreterUtil.makeUniqueKey(fexpr.getName(), fexpr.getDescriptor().descriptorString);
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if (fieldWithDescr == null) {
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fieldWithDescr = fieldKey;
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value = asexpr.getRight();
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}
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else {
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if (!fieldWithDescr.equals(fieldKey) ||
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!value.equals(asexpr.getRight())) {
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return;
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}
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}
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found = true;
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}
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}
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}
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}
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if (!found) {
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return;
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}
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}
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if (!wrapper.getDynamicFieldInitializers().containsKey(fieldWithDescr)) {
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wrapper.getDynamicFieldInitializers().addWithKey(value, fieldWithDescr);
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for (List<Exprent> lst : lstFirst) {
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lst.remove(isAnonymous ? 0 : 1);
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}
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}
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else {
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return;
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}
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}
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}
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private static boolean isExprentIndependent(Exprent exprent, MethodWrapper meth) {
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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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switch (expr.type) {
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case Exprent.EXPRENT_VAR:
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VarVersionPaar varpaar = new VarVersionPaar((VarExprent)expr);
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if (!meth.varproc.getExternalVars().contains(varpaar)) {
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String varname = meth.varproc.getVarName(varpaar);
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if (!varname.equals("this") && !varname.endsWith(".this")) { // FIXME: remove direct comparison with strings
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return false;
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}
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}
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break;
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case Exprent.EXPRENT_FIELD:
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return false;
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}
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}
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return true;
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}
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private static Statement findFirstData(Statement stat) {
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if (stat.getExprents() != null) {
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return stat;
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}
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else {
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if (stat.isLabeled()) { // FIXME: Why??
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return null;
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}
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switch (stat.type) {
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case Statement.TYPE_SEQUENCE:
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case Statement.TYPE_IF:
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case Statement.TYPE_ROOT:
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case Statement.TYPE_SWITCH:
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case Statement.TYPE_SYNCRONIZED:
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return findFirstData(stat.getFirst());
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default:
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return null;
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}
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}
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}
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private static boolean isInvocationInitConstructor(InvocationExprent inv, MethodWrapper meth, ClassWrapper wrapper, boolean withThis) {
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if (inv.getFunctype() == InvocationExprent.TYP_INIT) {
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if (inv.getInstance().type == Exprent.EXPRENT_VAR) {
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VarExprent instvar = (VarExprent)inv.getInstance();
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VarVersionPaar varpaar = new VarVersionPaar(instvar);
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String classname = meth.varproc.getThisVars().get(varpaar);
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if (classname != null) { // any this instance. TODO: Restrict to current class?
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if (withThis || !wrapper.getClassStruct().qualifiedName.equals(inv.getClassname())) {
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return true;
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}
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}
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}
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}
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return false;
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}
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}
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