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411 lines
13 KiB
411 lines
13 KiB
/* SyntheticAnalyzer Copyright (C) 1999-2002 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 Lesser 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 Lesser General Public License
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* along with this program; see the file COPYING.LESSER. 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 net.sf.jode.jvm;
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import net.sf.jode.GlobalOptions;
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import net.sf.jode.bytecode.BasicBlocks;
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import net.sf.jode.bytecode.Block;
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import net.sf.jode.bytecode.ClassInfo;
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import net.sf.jode.bytecode.FieldInfo;
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import net.sf.jode.bytecode.Handler;
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import net.sf.jode.bytecode.Instruction;
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import net.sf.jode.bytecode.MethodInfo;
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import net.sf.jode.bytecode.Opcodes;
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import net.sf.jode.bytecode.Reference;
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import net.sf.jode.bytecode.TypeSignature;
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import net.sf.jode.type.Type;
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import net.sf.jode.type.MethodType;
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import java.lang.reflect.Modifier;
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import java.io.IOException;
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///#def COLLECTIONS java.util
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import java.util.Arrays;
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import java.util.Iterator;
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///#enddef
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public class SyntheticAnalyzer implements Opcodes {
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public final static int UNKNOWN = 0;
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public final static int GETCLASS = 1;
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public final static int ACCESSGETFIELD = 2;
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public final static int ACCESSPUTFIELD = 3;
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public final static int ACCESSMETHOD = 4;
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public final static int ACCESSGETSTATIC = 5;
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public final static int ACCESSPUTSTATIC = 6;
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public final static int ACCESSSTATICMETHOD = 7;
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public final static int ACCESSCONSTRUCTOR = 8;
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public final static int ACCESSDUPPUTFIELD = 9;
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public final static int ACCESSDUPPUTSTATIC = 10;
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int kind = UNKNOWN;
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int unifyParam = -1;
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Reference reference;
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ClassInfo classInfo;
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MethodInfo method;
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public SyntheticAnalyzer(ClassInfo classInfo, MethodInfo method,
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boolean checkName) {
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this.classInfo = classInfo;
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this.method = method;
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if (method.getBasicBlocks() == null)
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return;
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if (!checkName || method.getName().equals("class$"))
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if (checkGetClass())
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return;
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if (!checkName || method.getName().startsWith("access$"))
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if (checkAccess())
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return;
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if (method.getName().equals("<init>"))
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if (checkConstructorAccess())
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return;
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}
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public int getKind() {
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return kind;
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}
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public Reference getReference() {
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return reference;
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}
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/**
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* Gets the index of the dummy parameter for an ACCESSCONSTRUCTOR.
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* Normally the 1 but for inner classes it may be 2.
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*/
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public int getUnifyParam() {
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return unifyParam;
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}
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private static final int[] getClassOpcodes = {
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opc_aload, opc_invokestatic, opc_areturn,
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opc_astore, opc_new, opc_dup, opc_aload,
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opc_invokevirtual, opc_invokespecial, opc_athrow
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};
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boolean checkGetClass() {
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if (!method.isStatic()
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|| !(method.getType()
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.equals("(Ljava/lang/String;)Ljava/lang/Class;")))
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return false;
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BasicBlocks bb = method.getBasicBlocks();
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Block[] blocks = bb.getBlocks();
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Block startBlock = bb.getStartBlock();
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Handler[] excHandlers = bb.getExceptionHandlers();
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if (startBlock == null
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|| startBlock.getInstructions().length < 2
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|| startBlock.getInstructions().length > 3
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|| excHandlers.length != 1
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|| excHandlers[0].getStart() != startBlock
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|| excHandlers[0].getEnd() != startBlock
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|| !"java.lang.ClassNotFoundException"
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.equals(excHandlers[0].getType()))
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return false;
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for (int i=0; i< 2; i++) {
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Instruction instr = startBlock.getInstructions()[i];
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if (instr.getOpcode() != getClassOpcodes[i])
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return false;
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if (i == 1) {
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Reference ref = instr.getReference();
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if (!ref.getClazz().equals("Ljava/lang/Class;")
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|| !ref.getName().equals("forName"))
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return false;
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}
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if (i == 0 && instr.getLocalSlot() != 0)
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return false;
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}
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if (startBlock.getInstructions().length == 2) {
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/* JDK 1.4: The return is outside of startBlock */
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Block nextBlock = startBlock.getSuccs()[0];
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Instruction[] instrs = nextBlock.getInstructions();
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if (instrs[0].getOpcode() != opc_areturn)
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return false;
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} else {
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/* JDK 1.3 */
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if (startBlock.getInstructions()[2].getOpcode() != opc_areturn)
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return false;
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}
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Block catchBlock = excHandlers[0].getCatcher();
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if (catchBlock.getInstructions().length != 7)
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return false;
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int excSlot = -1;
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for (int i=0; i< 7; i++) {
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Instruction instr = catchBlock.getInstructions()[i];
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if (instr.getOpcode() != getClassOpcodes[3+i])
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return false;
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if (i == 0)
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excSlot = instr.getLocalSlot();
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if (i == 1 && !instr.getClazzType().equals
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("Ljava/lang/NoClassDefFoundError;"))
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return false;
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if (i == 3 && instr.getLocalSlot() != excSlot)
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return false;
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if (i == 4
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&& !instr.getReference().getName().equals("getMessage"))
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return false;
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if (i == 5
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&& !instr.getReference().getName().equals("<init>"))
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return false;
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}
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this.kind = GETCLASS;
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return true;
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}
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private final int modifierMask = Modifier.PUBLIC;
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/**
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* Check if this is a field/method access method. We have only
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* very few checks: The parameter must be loaded in correct order,
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* followed by an get/put/invoke-field/static/special consuming
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* all loaded parameters. The CodeVerifier has already checked
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* that types of parameters are okay.
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*/
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private boolean checkAccess() {
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BasicBlocks bb = method.getBasicBlocks();
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Handler[] excHandlers = bb.getExceptionHandlers();
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if (excHandlers != null && excHandlers.length != 0)
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return false;
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Block[] blocks = bb.getBlocks();
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Block startBlock = bb.getStartBlock();
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if (startBlock == null)
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return false;
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Block[] succBlocks = startBlock.getSuccs();
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if (succBlocks.length > 1 ||
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(succBlocks.length == 1 && succBlocks[0] != null))
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return false;
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Iterator iter = Arrays.asList(startBlock.getInstructions()).iterator();
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boolean dupSeen = false;
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if (!iter.hasNext())
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return false;
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Instruction instr = (Instruction) iter.next();
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int params = 0, slot = 0;
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while (instr.getOpcode() >= opc_iload
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&& instr.getOpcode() <= opc_aload
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&& instr.getLocalSlot() == slot) {
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params++;
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slot += (instr.getOpcode() == opc_lload
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|| instr.getOpcode() == opc_dload) ? 2 : 1;
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if (!iter.hasNext())
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return false;
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instr = (Instruction) iter.next();
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}
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if (instr.getOpcode() == opc_getstatic
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|| instr.getOpcode() == opc_getfield) {
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boolean isStatic = instr.getOpcode() == opc_getstatic;
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if (!isStatic)
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params--;
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if (params != 0)
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return false;
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Reference ref = instr.getReference();
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ClassInfo refClazz = TypeSignature
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.getClassInfo(classInfo.getClassPath(), ref.getClazz());
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try {
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if (!refClazz.superClassOf(classInfo))
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return false;
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} catch (IOException ex) {
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/* Can't get enough info to ensure that refClazz is correct */
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return false;
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}
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FieldInfo refField
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= refClazz.findField(ref.getName(), ref.getType());
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if ((refField.getModifiers() & modifierMask) != 0)
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return false;
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if (!iter.hasNext())
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return false;
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instr = (Instruction) iter.next();
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if (instr.getOpcode() < opc_ireturn
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|| instr.getOpcode() > opc_areturn)
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return false;
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/* For valid bytecode the type matches automatically */
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reference = ref;
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kind = (isStatic ? ACCESSGETSTATIC : ACCESSGETFIELD);
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return true;
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}
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if (instr.getOpcode() == (opc_dup - 3) + 3 * slot) {
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/* This is probably a opc_dup or opc_dup2,
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* preceding a opc_putfield
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*/
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instr = (Instruction) iter.next();
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if (instr.getOpcode() != opc_putstatic
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&& instr.getOpcode() != opc_putfield)
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return false;
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dupSeen = true;
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}
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if (instr.getOpcode() == opc_putfield
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|| instr.getOpcode() == opc_putstatic) {
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boolean isStatic = instr.getOpcode() == opc_putstatic;
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if (!isStatic)
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params--;
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if (params != 1)
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return false;
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/* For valid bytecode the type of param matches automatically */
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Reference ref = instr.getReference();
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ClassInfo refClazz = TypeSignature
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.getClassInfo(classInfo.getClassPath(), ref.getClazz());
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try {
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if (!refClazz.superClassOf(classInfo))
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return false;
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} catch (IOException ex) {
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/* Can't get enough info to ensure that refClazz is correct */
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return false;
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}
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FieldInfo refField
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= refClazz.findField(ref.getName(), ref.getType());
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if ((refField.getModifiers() & modifierMask) != 0)
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return false;
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if (dupSeen) {
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if (!iter.hasNext())
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return false;
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instr = (Instruction) iter.next();
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if (instr.getOpcode() < opc_ireturn
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|| instr.getOpcode() > opc_areturn)
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return false;
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kind = (isStatic ? ACCESSDUPPUTSTATIC : ACCESSDUPPUTFIELD);
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} else {
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if (iter.hasNext())
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return false;
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kind = (isStatic ? ACCESSPUTSTATIC : ACCESSPUTFIELD);
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}
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reference = ref;
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return true;
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}
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if (instr.getOpcode() == opc_invokestatic
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|| instr.getOpcode() == opc_invokespecial) {
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boolean isStatic = instr.getOpcode() == opc_invokestatic;
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if (!isStatic)
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params--;
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Reference ref = instr.getReference();
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ClassInfo refClazz = TypeSignature
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.getClassInfo(classInfo.getClassPath(), ref.getClazz());
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try {
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if (!refClazz.superClassOf(classInfo))
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return false;
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} catch (IOException ex) {
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/* Can't get enough info to ensure that refClazz is correct */
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return false;
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}
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MethodInfo refMethod
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= refClazz.findMethod(ref.getName(), ref.getType());
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MethodType refType = Type.tMethod(classInfo.getClassPath(),
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ref.getType());
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if ((refMethod.getModifiers() & modifierMask) != 0
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|| refType.getParameterTypes().length != params)
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return false;
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if (refType.getReturnType() == Type.tVoid) {
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if (iter.hasNext())
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return false;
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} else {
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if (!iter.hasNext())
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return false;
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instr = (Instruction) iter.next();
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if (instr.getOpcode() < opc_ireturn
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|| instr.getOpcode() > opc_areturn)
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return false;
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}
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/* For valid bytecode the types matches automatically */
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reference = ref;
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kind = (isStatic ? ACCESSSTATICMETHOD : ACCESSMETHOD);
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return true;
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}
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return false;
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}
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private boolean checkConstructorAccess() {
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BasicBlocks bb = method.getBasicBlocks();
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String[] paramTypes
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= TypeSignature.getParameterTypes(method.getType());
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Handler[] excHandlers = bb.getExceptionHandlers();
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if (excHandlers != null && excHandlers.length != 0)
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return false;
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Block startBlock = bb.getStartBlock();
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if (startBlock == null)
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return false;
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Block[] succBlocks = startBlock.getSuccs();
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if (succBlocks.length != 1 || succBlocks[0] != null)
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return false;
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Iterator iter = Arrays.asList(startBlock.getInstructions()).iterator();
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if (!iter.hasNext())
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return false;
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unifyParam = -1;
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Instruction instr = (Instruction) iter.next();
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int params = 0, slot = 0;
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while (instr.getOpcode() >= opc_iload
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&& instr.getOpcode() <= opc_aload) {
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if (instr.getLocalSlot() > slot
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&& unifyParam == -1 && params > 0
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&& paramTypes[params-1].charAt(0) == 'L') {
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unifyParam = params;
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params++;
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slot++;
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}
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if (instr.getLocalSlot() != slot)
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return false;
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params++;
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slot += (instr.getOpcode() == opc_lload
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|| instr.getOpcode() == opc_dload) ? 2 : 1;
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if (!iter.hasNext())
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return false;
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instr = (Instruction) iter.next();
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}
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if (unifyParam == -1
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&& params > 0 && params <= paramTypes.length
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&& paramTypes[params-1].charAt(0) == 'L') {
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unifyParam = params;
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params++;
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slot++;
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}
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if (params > 0 && instr.getOpcode() == opc_invokespecial) {
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Reference ref = instr.getReference();
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ClassInfo refClazz = TypeSignature
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.getClassInfo(classInfo.getClassPath(), ref.getClazz());
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if (refClazz != classInfo)
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return false;
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MethodInfo refMethod
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= refClazz.findMethod(ref.getName(), ref.getType());
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MethodType refType = Type.tMethod(classInfo.getClassPath(),
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ref.getType());
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if ((refMethod.getModifiers() & modifierMask) != 0
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|| !refMethod.getName().equals("<init>")
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|| unifyParam == -1
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|| refType.getParameterTypes().length != params - 2)
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return false;
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if (iter.hasNext())
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return false;
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/* We don't check if types matches. No problem since we only
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* need to make sure, this constructor doesn't do anything
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* more than relay to the real one.
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*/
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reference = ref;
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kind = ACCESSCONSTRUCTOR;
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return true;
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}
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return false;
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}
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}
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