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322 lines
10 KiB
322 lines
10 KiB
10 years ago
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/*
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* Fernflower - The Analytical Java Decompiler
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* http://www.reversed-java.com
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*
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* (C) 2008 - 2010, Stiver
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*
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* This software is NEITHER public domain NOR free software
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* as per GNU License. See license.txt for more details.
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*
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* This software is distributed WITHOUT ANY WARRANTY; without
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* even the implied warranty of MERCHANTABILITY or FITNESS FOR
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* A PARTICULAR PURPOSE.
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*/
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10 years ago
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package org.jetbrains.java.decompiler.main;
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10 years ago
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import java.util.ArrayList;
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import java.util.List;
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10 years ago
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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.AssignmentExprent;
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import org.jetbrains.java.decompiler.modules.decompiler.exps.Exprent;
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import org.jetbrains.java.decompiler.modules.decompiler.exps.FieldExprent;
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import org.jetbrains.java.decompiler.modules.decompiler.exps.InvocationExprent;
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import org.jetbrains.java.decompiler.modules.decompiler.exps.VarExprent;
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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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10 years ago
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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.access_flags & CodeConstants.ACC_FINAL) != 0) {
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action = 1;
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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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10 years ago
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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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10 years ago
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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 || !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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for(;;) {
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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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10 years ago
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if(!fexpr.isStatic() && fexpr.getClassname().equals(cl.qualifiedName) &&
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cl.hasField(fexpr.getName(), fexpr.getDescriptor().descriptorString)) { // check for the physical existence of the field. Could be defined in a superclass.
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10 years ago
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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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} 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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} 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.getExternvars().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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} 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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