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177 lines
5.2 KiB
177 lines
5.2 KiB
/* GetFieldOperator Copyright (C) 1998-1999 Jochen Hoenicke.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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package jode.expr;
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import jode.type.Type;
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import jode.type.NullType;
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import jode.type.ClassInterfacesType;
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import jode.bytecode.ClassInfo;
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import jode.bytecode.Reference;
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import jode.decompiler.CodeAnalyzer;
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import jode.decompiler.ClassAnalyzer;
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import jode.decompiler.MethodAnalyzer;
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import jode.decompiler.FieldAnalyzer;
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import jode.decompiler.TabbedPrintWriter;
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import jode.decompiler.Scope;
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public class GetFieldOperator extends Operator {
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boolean staticFlag;
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CodeAnalyzer codeAnalyzer;
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Reference ref;
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Type classType;
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public GetFieldOperator(CodeAnalyzer codeAnalyzer, boolean staticFlag,
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Reference ref) {
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super(Type.tType(ref.getType()), 0);
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this.codeAnalyzer = codeAnalyzer;
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this.staticFlag = staticFlag;
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this.classType = Type.tType(ref.getClazz());
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this.ref = ref;
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if (staticFlag)
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codeAnalyzer.useType(classType);
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initOperands(staticFlag ? 0 : 1);
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}
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public int getPriority() {
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return 950;
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}
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public void updateSubTypes() {
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if (!staticFlag)
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subExpressions[0].setType(Type.tSubType(classType));
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}
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public void updateType() {
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}
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/**
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* Checks, whether this is a call of a method from this class or an
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* outer instance.
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*/
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public boolean isOuter() {
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if (classType instanceof ClassInterfacesType) {
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ClassInfo clazz = ((ClassInterfacesType) classType).getClassInfo();
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ClassAnalyzer ana = codeAnalyzer.getClassAnalyzer();
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while (true) {
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if (clazz == ana.getClazz())
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return true;
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if (ana.getParent() instanceof MethodAnalyzer)
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ana = ((MethodAnalyzer) ana.getParent())
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.getClassAnalyzer();
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else if (ana.getParent() instanceof ClassAnalyzer)
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ana = (ClassAnalyzer) ana.getParent();
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else
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return false;
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}
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}
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return false;
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}
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public ClassInfo getClassInfo() {
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if (classType instanceof ClassInterfacesType)
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return ((ClassInterfacesType) classType).getClassInfo();
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return null;
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}
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public FieldAnalyzer getField() {
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ClassInfo clazz = getClassInfo();
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if (clazz != null) {
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ClassAnalyzer ana = codeAnalyzer.getClassAnalyzer();
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while (true) {
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if (clazz == ana.getClazz()) {
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return ana.getField(ref.getName(),
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Type.tType(ref.getType()));
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}
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if (ana.getParent() instanceof MethodAnalyzer)
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ana = ((MethodAnalyzer) ana.getParent())
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.getClassAnalyzer();
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else if (ana.getParent() instanceof ClassAnalyzer)
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ana = (ClassAnalyzer) ana.getParent();
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else
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return null;
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}
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}
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return null;
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}
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public void dumpExpression(TabbedPrintWriter writer)
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throws java.io.IOException {
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boolean opIsThis = !staticFlag
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&& subExpressions[0] instanceof ThisOperator;
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String fieldName = ref.getName();
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if (staticFlag) {
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if (!classType.equals(Type.tClass(codeAnalyzer.getClazz()))
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|| codeAnalyzer.findLocal(fieldName) != null) {
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writer.printType(classType);
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writer.print(".");
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}
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writer.print(fieldName);
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} else if (subExpressions[0].getType() instanceof NullType) {
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writer.print("((");
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writer.printType(classType);
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writer.print(")");
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subExpressions[0].dumpExpression(writer, 700);
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writer.print(").");
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writer.print(fieldName);
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} else {
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if (opIsThis) {
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ThisOperator thisOp = (ThisOperator) subExpressions[0];
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Scope scope = writer.getScope(thisOp.getClassInfo(),
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Scope.CLASSSCOPE);
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if (scope == null || writer.conflicts(fieldName, scope,
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Scope.FIELDNAME)) {
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thisOp.dumpExpression(writer, 950);
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writer.print(".");
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} else if (writer.conflicts(fieldName, scope,
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Scope.AMBIGUOUSNAME)
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|| (/* This is a inherited field conflicting
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* with a field name in some outer class.
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*/
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getField() == null
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&& writer.conflicts(fieldName, null,
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Scope.FIELDNAME))) {
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writer.print("this.");
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}
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} else {
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subExpressions[0].dumpExpression(writer, 950);
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writer.print(".");
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}
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writer.print(fieldName);
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}
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}
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public Expression simplify() {
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if (!staticFlag) {
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subExpressions[0] = subExpressions[0].simplify();
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subExpressions[0].parent = this;
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if (subExpressions[0] instanceof ThisOperator
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&& getField() != null) {
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Expression constant = getField().getConstant();
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if (constant instanceof ThisOperator)
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return constant;
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}
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}
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return this;
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}
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public boolean opEquals(Operator o) {
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return o instanceof GetFieldOperator
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&& ((GetFieldOperator)o).ref.equals(ref);
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}
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}
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