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435 lines
14 KiB
435 lines
14 KiB
/* SyntheticAnalyzer Copyright (C) 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.jvm;
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import jode.GlobalOptions;
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import jode.bytecode.BasicBlocks;
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import jode.bytecode.Block;
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import jode.bytecode.ClassInfo;
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import jode.bytecode.FieldInfo;
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import jode.bytecode.Handler;
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import jode.bytecode.Instruction;
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import jode.bytecode.MethodInfo;
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import jode.bytecode.Opcodes;
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import jode.bytecode.Reference;
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import jode.type.Type;
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import jode.type.MethodType;
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import java.lang.reflect.Modifier;
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///#def COLLECTIONS java.util
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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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int kind = UNKNOWN;
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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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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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private static final Reference[] getClassRefs = {
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null, Reference.getReference("Ljava/lang/Class;", "forName",
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"(Ljava/lang/String;)Ljava/lang/Class;"),
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null, null, null, null, null,
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Reference.getReference("Ljava/lang/Throwable;", "getMessage",
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"()Ljava/lang/String;"),
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Reference.getReference("Ljava/lang/NoClassDefFoundError;", "<init>",
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"(Ljava/lang/String;)V"), null
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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().size() != 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< 3; i++) {
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Instruction instr =
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(Instruction) startBlock.getInstructions().get(i);
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if (instr.getOpcode() != getClassOpcodes[i])
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return false;
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if (getClassRefs[i] != null
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&& !getClassRefs[i].equals(instr.getReference()))
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return false;
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if (i == 0 && instr.getLocalSlot() != 0)
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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().size() != 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 = (Instruction)
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catchBlock.getInstructions().get(i);
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if (instr.getOpcode() != getClassOpcodes[3+i])
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return false;
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if (getClassRefs[3+i] != null
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&& !getClassRefs[3+i].equals(instr.getReference()))
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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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}
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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.PRIVATE | Modifier.PROTECTED |
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Modifier.PUBLIC | Modifier.STATIC);
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public boolean checkStaticAccess() {
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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 = startBlock.getInstructions().iterator();
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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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if (instr.getOpcode() == opc_getstatic) {
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Reference ref = instr.getReference();
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String refClazz = ref.getClazz().substring(1);
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if (!(refClazz.substring(0, refClazz.length()-1)
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.equals(classInfo.getName().replace('.','/'))))
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return false;
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FieldInfo refField
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= classInfo.findField(ref.getName(), ref.getType());
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if ((refField.getModifiers() & modifierMask) !=
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(Modifier.PRIVATE | Modifier.STATIC))
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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 = ACCESSGETSTATIC;
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return true;
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}
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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_putstatic) {
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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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String refClazz = ref.getClazz().substring(1);
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if (!(refClazz.substring(0, refClazz.length()-1)
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.equals(classInfo.getName().replace('.','/'))))
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return false;
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FieldInfo refField
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= classInfo.findField(ref.getName(), ref.getType());
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if ((refField.getModifiers() & modifierMask) !=
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(Modifier.PRIVATE | Modifier.STATIC))
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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_return)
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return false;
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reference = ref;
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kind = ACCESSPUTSTATIC;
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return true;
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}
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if (instr.getOpcode() == opc_invokestatic) {
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Reference ref = instr.getReference();
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String refClazz = ref.getClazz().substring(1);
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if (!(refClazz.substring(0, refClazz.length()-1)
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.equals(classInfo.getName().replace('.','/'))))
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return false;
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MethodInfo refMethod
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= classInfo.findMethod(ref.getName(), ref.getType());
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MethodType refType = Type.tMethod(ref.getType());
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if ((refMethod.getModifiers() & modifierMask) !=
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(Modifier.PRIVATE | Modifier.STATIC)
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|| refType.getParameterTypes().length != params)
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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 (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 = ACCESSSTATICMETHOD;
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return true;
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}
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return false;
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}
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public boolean checkAccess() {
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if (method.isStatic()) {
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if (checkStaticAccess())
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return true;
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}
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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 = startBlock.getInstructions().iterator();
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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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if (instr.getOpcode() != opc_aload || instr.getLocalSlot() != 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_getfield) {
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Reference ref = instr.getReference();
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String refClazz = ref.getClazz().substring(1);
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if (!(refClazz.substring(0, refClazz.length()-1)
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.equals(classInfo.getName().replace('.','/'))))
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return false;
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FieldInfo refField
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= classInfo.findField(ref.getName(), ref.getType());
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if ((refField.getModifiers() & modifierMask) != Modifier.PRIVATE)
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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 = ACCESSGETFIELD;
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return true;
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}
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int params = 0, slot = 1;
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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_putfield) {
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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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String refClazz = ref.getClazz().substring(1);
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if (!(refClazz.substring(0, refClazz.length()-1)
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.equals(classInfo.getName().replace('.','/'))))
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return false;
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FieldInfo refField
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= classInfo.findField(ref.getName(), ref.getType());
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if ((refField.getModifiers() & modifierMask) != Modifier.PRIVATE)
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return false;
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if (iter.hasNext())
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return false;
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reference = ref;
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kind = ACCESSPUTFIELD;
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return true;
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}
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if (instr.getOpcode() == opc_invokespecial) {
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Reference ref = instr.getReference();
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String refClazz = ref.getClazz().substring(1);
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if (!(refClazz.substring(0, refClazz.length()-1)
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.equals(classInfo.getName().replace('.','/'))))
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return false;
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MethodInfo refMethod
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= classInfo.findMethod(ref.getName(), ref.getType());
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MethodType refType = Type.tMethod(ref.getType());
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if ((refMethod.getModifiers() & modifierMask) != Modifier.PRIVATE
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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 = 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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public boolean checkConstructorAccess() {
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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 || succBlocks[0] != null)
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return false;
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Iterator iter = startBlock.getInstructions().iterator();
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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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if (instr.getOpcode() != opc_aload || instr.getLocalSlot() != 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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// slot begins with 2. Slot 1 contains a dummy value, that
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// is used so that the constructor has a different type signature.
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int params = 0, slot = 2;
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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_invokespecial) {
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Reference ref = instr.getReference();
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String refClazz = ref.getClazz().substring(1);
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if (!(refClazz.substring(0, refClazz.length()-1)
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.equals(classInfo.getName().replace('.','/'))))
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return false;
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MethodInfo refMethod
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= classInfo.findMethod(ref.getName(), ref.getType());
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MethodType refType = Type.tMethod(ref.getType());
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if ((refMethod.getModifiers() & modifierMask) != Modifier.PRIVATE
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|| !refMethod.getName().equals("<init>")
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|| refType.getParameterTypes().length != params)
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return false;
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if (iter.hasNext())
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return false;
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/* For valid bytecode the types matches automatically */
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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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