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249 lines
9.5 KiB
249 lines
9.5 KiB
// Copyright 2000-2020 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.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.stats.Statements;
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import org.jetbrains.java.decompiler.modules.decompiler.vars.VarVersionPair;
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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 final class InitializerProcessor {
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public static void extractInitializers(ClassWrapper wrapper) {
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MethodWrapper method = wrapper.getMethodWrapper(CodeConstants.CLINIT_NAME, "()V");
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if (method != null && method.root != null) { // successfully decompiled static constructor
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extractStaticInitializers(wrapper, method);
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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 method : wrapper.getMethods()) {
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if (CodeConstants.INIT_NAME.equals(method.methodStruct.getName()) && method.root != null) {
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Statement firstData = Statements.findFirstData(method.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 assignExpr = (AssignmentExprent)exprent;
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if (assignExpr.getLeft().type == Exprent.EXPRENT_FIELD && assignExpr.getRight().type == Exprent.EXPRENT_VAR) {
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FieldExprent fExpr = (FieldExprent)assignExpr.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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Statements.isInvocationInitConstructor((InvocationExprent)exprent, method, 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 method : wrapper.getMethods()) {
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if (CodeConstants.INIT_NAME.equals(method.methodStruct.getName()) && method.root != null) {
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Statement firstData = Statements.findFirstData(method.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 (Statements.isInvocationInitConstructor(invExpr, method, 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 method) {
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RootStatement root = method.root;
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StructClass cl = wrapper.getClassStruct();
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Statement firstData = Statements.findFirstData(root);
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if (firstData != null) {
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boolean inlineInitializers = cl.hasModifier(CodeConstants.ACC_INTERFACE) || cl.hasModifier(CodeConstants.ACC_ENUM);
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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 assignExpr = (AssignmentExprent)exprent;
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if (assignExpr.getLeft().type == Exprent.EXPRENT_FIELD) {
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FieldExprent fExpr = (FieldExprent)assignExpr.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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// interfaces fields should always be initialized inline
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if (inlineInitializers || isExprentIndependent(assignExpr.getRight(), method)) {
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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(assignExpr.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<>();
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List<MethodWrapper> lstMethodWrappers = new ArrayList<>();
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for (MethodWrapper method : wrapper.getMethods()) {
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if (CodeConstants.INIT_NAME.equals(method.methodStruct.getName()) && method.root != null) { // successfully decompiled constructor
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Statement firstData = Statements.findFirstData(method.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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lstMethodWrappers.add(method);
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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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!Statements.isInvocationInitConstructor((InvocationExprent)exprent, method, 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 assignExpr = (AssignmentExprent)exprent;
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if (assignExpr.getLeft().type == Exprent.EXPRENT_FIELD) {
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FieldExprent fExpr = (FieldExprent)assignExpr.getLeft();
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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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if (isExprentIndependent(assignExpr.getRight(), lstMethodWrappers.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 = assignExpr.getRight();
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}
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else {
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if (!fieldWithDescr.equals(fieldKey) ||
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!value.equals(assignExpr.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 method) {
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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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VarVersionPair varPair = new VarVersionPair((VarExprent)expr);
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if (!method.varproc.getExternalVars().contains(varPair)) {
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String varName = method.varproc.getVarName(varPair);
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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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}
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}
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return true;
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}
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} |