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278 lines
8.2 KiB
278 lines
8.2 KiB
/* InvokeOperator 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.decompiler.CodeAnalyzer;
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import jode.decompiler.ClassAnalyzer;
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import jode.decompiler.TabbedPrintWriter;
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import jode.GlobalOptions;
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import jode.bytecode.*;
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import jode.jvm.*;
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import jode.type.*;
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import java.lang.reflect.InvocationTargetException;
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public final class InvokeOperator extends Operator
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implements MatchableOperator {
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CodeAnalyzer codeAnalyzer;
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boolean staticFlag;
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boolean specialFlag;
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MethodType methodType;
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String methodName;
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Type clazz;
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public InvokeOperator(CodeAnalyzer codeAnalyzer,
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boolean staticFlag, boolean specialFlag,
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Reference reference) {
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super(Type.tUnknown, 0);
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this.methodType = (MethodType) Type.tType(reference.getType());
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this.methodName = reference.getName();
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this.clazz = Type.tType(reference.getClazz());
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this.type = methodType.getReturnType();
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this.codeAnalyzer = codeAnalyzer;
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this.staticFlag = staticFlag;
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this.specialFlag = specialFlag;
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if (staticFlag)
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codeAnalyzer.useType(clazz);
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}
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/**
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* Checks if the value of the given expression can change, due to
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* side effects in this expression. If this returns false, the
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* expression can safely be moved behind the current expresion.
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* @param expr the expression that should not change.
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*/
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public boolean hasSideEffects(Expression expr) {
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return expr.containsConflictingLoad(this);
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}
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/**
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* Checks if the value of the operator can be changed by this expression.
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*/
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public boolean matches(Operator loadop) {
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return (loadop instanceof InvokeOperator
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|| loadop instanceof ConstructorOperator
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|| loadop instanceof GetFieldOperator);
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}
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public final boolean isStatic() {
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return staticFlag;
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}
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public MethodType getMethodType() {
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return methodType;
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}
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public String getMethodName() {
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return methodName;
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}
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public Type getClassType() {
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return clazz;
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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 int getOperandCount() {
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return (isStatic()?0:1)
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+ methodType.getParameterTypes().length;
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}
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public Type getOperandType(int i) {
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if (!isStatic()) {
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if (i == 0)
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return getClassType();
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i--;
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}
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return methodType.getParameterTypes()[i];
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}
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public void setOperandType(Type types[]) {
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}
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public boolean isConstructor() {
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return methodName.equals("<init>");
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}
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/**
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* Checks, whether this is a call of a method from this class.
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* @XXX check, if this class implements the method and if not
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* allow super class
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*/
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public boolean isThis() {
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if (clazz instanceof ClassInterfacesType) {
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return ((ClassInterfacesType) clazz).getClassInfo()
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== codeAnalyzer.getClazz();
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}
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return false;
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}
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/**
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* Checks, whether this is a call of a method from the super class.
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* @XXX check, if its the first super class that implements the method.
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*/
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public boolean isSuperOrThis() {
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if (clazz instanceof ClassInterfacesType) {
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return ((ClassInterfacesType) clazz).getClassInfo()
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.superClassOf(codeAnalyzer.getClazz());
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}
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return false;
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}
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public void dumpExpression(TabbedPrintWriter writer,
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Expression[] operands)
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throws java.io.IOException {
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boolean opIsThis =
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(!staticFlag
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&& operands[0] instanceof LocalLoadOperator
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&& !codeAnalyzer.getMethod().isStatic()
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&& (((LocalLoadOperator) operands[0]).getLocalInfo()
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.equals(codeAnalyzer.getParamInfo(0))));
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int arg = 1;
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if (specialFlag) {
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if (opIsThis) {
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if (isThis()) {
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/* XXX check if this is a private or final method. */
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} else {
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/* XXX check that this is the first defined
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* super method. */
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writer.print("super");
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opIsThis = false;
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}
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} else {
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/* XXX check if this is a private or final method. */
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if (!isThis()) {
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writer.print("(NON VIRTUAL ");
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writer.printType(clazz);
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writer.print(")");
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}
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operands[0].dumpExpression(writer, 950);
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}
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} else if (staticFlag) {
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arg = 0;
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if (isThis())
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opIsThis = true;
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else
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writer.printType(clazz);
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} else {
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if (!opIsThis) {
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int minPriority = 950; /* field access */
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if (operands[0].getType() instanceof NullType) {
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writer.print("(");
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writer.printType(clazz);
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writer.print(") ");
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minPriority = 700;
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}
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operands[0].dumpExpression(writer, minPriority);
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}
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}
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if (isConstructor()) {
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if (opIsThis)
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writer.print("this");
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} else {
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if (!opIsThis)
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writer.print(".");
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writer.print(methodName);
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}
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writer.print("(");
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for (int i=0; i < methodType.getParameterTypes().length; i++) {
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if (i>0)
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writer.print(", ");
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operands[arg++].dumpExpression(writer, 0);
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}
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writer.print(")");
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}
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/**
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* Checks if the method is the magic class$ method.
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* @return true if this is the magic class$ method, false otherwise.
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*/
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public boolean isGetClass() {
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return isThis()
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&& codeAnalyzer.getClassAnalyzer()
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.getMethod(methodName, methodType).isGetClass();
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}
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class Environment extends SimpleRuntimeEnvironment {
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public Object invokeMethod(Reference ref, boolean isVirtual,
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Object cls, Object[] params)
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throws InterpreterException, InvocationTargetException {
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if (ref.getClazz().equals
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("L"+codeAnalyzer.getClazz().getName().replace('.','/')+";")) {
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MethodType mt = (MethodType) Type.tType(ref.getType());
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BytecodeInfo info = codeAnalyzer.getClassAnalyzer()
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.getMethod(ref.getName(), mt).getCode().getBytecodeInfo();
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Value[] locals = new Value[info.getMaxLocals()];
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for (int i=0; i< locals.length; i++)
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locals[i] = new Value();
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int param = params.length;
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int slot = 0;
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if (cls != null)
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locals[slot++].setObject(cls);
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for (int i = 0; i < param; i++) {
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locals[slot].setObject(params[i]);
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slot += mt.getParameterTypes()[i].stackSize();
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}
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return Interpreter.interpretMethod(this, info, locals);
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} else
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return super.invokeMethod(ref, isVirtual, cls, params);
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}
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}
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public ConstOperator deobfuscateString(ConstOperator op) {
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if (!isThis() || !isStatic()
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|| methodType.getParameterTypes().length != 1
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|| !methodType.getParameterTypes()[0].equals(Type.tString)
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|| !methodType.getReturnType().equals(Type.tString))
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return null;
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ClassAnalyzer clazz = codeAnalyzer.getClassAnalyzer();
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CodeAnalyzer ca = clazz.getMethod(methodName, methodType).getCode();
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if (ca == null)
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return null;
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Environment env = new Environment();
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BytecodeInfo info = ca.getBytecodeInfo();
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Value[] locals = new Value[info.getMaxLocals()];
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for (int i=0; i< locals.length; i++)
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locals[i] = new Value();
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locals[0].setObject(op.getValue());
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String result;
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try {
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result = (String) Interpreter.interpretMethod(env, info, locals);
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} catch (InterpreterException ex) {
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GlobalOptions.err.println("Warning: Can't interpret method "
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+methodName);
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ex.printStackTrace(GlobalOptions.err);
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return null;
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} catch (InvocationTargetException ex) {
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GlobalOptions.err.println("Warning: Interpreted method throws"
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+" an uncaught exception: ");
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ex.getTargetException().printStackTrace(GlobalOptions.err);
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return null;
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}
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return new ConstOperator(result);
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}
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/* Invokes never equals: they may return different values even if
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* they have the same parameters.
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*/
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}
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