872 lines
26 KiB
Java
872 lines
26 KiB
Java
/*******************************************************************************
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* Copyright (c) 2002,2006 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.shrikeBT.analysis;
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import java.io.IOException;
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import java.io.Writer;
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import java.util.ArrayList;
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import java.util.BitSet;
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import java.util.List;
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import com.ibm.wala.shrikeBT.Constants;
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import com.ibm.wala.shrikeBT.DupInstruction;
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import com.ibm.wala.shrikeBT.ExceptionHandler;
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import com.ibm.wala.shrikeBT.IInstruction;
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import com.ibm.wala.shrikeBT.IInvokeInstruction;
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import com.ibm.wala.shrikeBT.IInvokeInstruction.Dispatch;
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import com.ibm.wala.shrikeBT.ILoadInstruction;
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import com.ibm.wala.shrikeBT.IStoreInstruction;
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import com.ibm.wala.shrikeBT.LoadInstruction;
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import com.ibm.wala.shrikeBT.MethodData;
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import com.ibm.wala.shrikeBT.NewInstruction;
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import com.ibm.wala.shrikeBT.StoreInstruction;
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import com.ibm.wala.shrikeBT.SwapInstruction;
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import com.ibm.wala.shrikeBT.Util;
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/**
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* @author roca
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*/
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public class Analyzer {
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public static final String thisType = "THIS";
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public static final String topType = "TOP";
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// inputs
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final protected boolean isConstructor;
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final protected boolean isStatic;
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final protected String classType;
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final protected String signature;
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final protected IInstruction[] instructions;
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final protected ExceptionHandler[][] handlers;
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protected ClassHierarchyProvider hierarchy;
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// working
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protected int maxStack;
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protected int maxLocals;
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protected String[][] stacks;
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protected String[][] locals;
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protected int[] stackSizes;
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protected BitSet basicBlockStarts;
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protected int[][] backEdges;
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protected int[] instToBC;
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protected String[][] varTypes;
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protected final static String[] noStrings = new String[0];
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protected final static int[] noEdges = new int[0];
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public Analyzer(boolean isConstructor, boolean isStatic, String classType, String signature, IInstruction[] instructions, ExceptionHandler[][] handlers, int[] instToBC, String[][] vars) {
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if (instructions == null) {
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throw new IllegalArgumentException("null instructions");
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}
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if (handlers == null) {
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throw new IllegalArgumentException("null handlers");
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}
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for (IInstruction i : instructions) {
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if (i == null) {
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throw new IllegalArgumentException("null instruction is illegal");
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}
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}
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this.classType = classType;
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this.isConstructor = isConstructor;
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this.isStatic = isStatic;
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this.signature = signature;
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this.instructions = instructions;
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this.handlers = handlers;
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this.instToBC = instToBC;
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this.varTypes = vars;
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}
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/**
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* Use class hierarchy information in 'h'. If this method is not called or h provides only partial hierarchy information, the
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* verifier behaves optimistically.
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*/
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final public void setClassHierarchy(ClassHierarchyProvider h) {
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this.hierarchy = h;
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}
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private void addBackEdge(int from, int to) {
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int[] oldEdges = backEdges[from];
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if (oldEdges == null) {
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backEdges[from] = new int[] { to };
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} else if (oldEdges[oldEdges.length - 1] < 0) {
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int left = 1;
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int right = oldEdges.length - 1;
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while (true) {
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if (right - left < 2) {
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if (oldEdges[left] < 0) {
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break;
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} else {
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if (oldEdges[right] >= 0)
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throw new Error("Failed binary search");
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left = right;
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break;
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}
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} else {
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int mid = (left + right) / 2;
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if (oldEdges[mid] < 0) {
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right = mid;
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} else {
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left = mid + 1;
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}
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}
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}
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oldEdges[left] = to;
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} else {
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int[] newEdges = new int[oldEdges.length * 2];
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System.arraycopy(oldEdges, 0, newEdges, 0, oldEdges.length);
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newEdges[oldEdges.length] = to;
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for (int i = oldEdges.length + 1; i < newEdges.length; i++) {
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newEdges[i] = -1;
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}
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backEdges[from] = newEdges;
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}
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}
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final public int[][] getBackEdges() {
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if (backEdges != null) {
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return backEdges;
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}
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backEdges = new int[instructions.length][];
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for (int i = 0; i < instructions.length; i++) {
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IInstruction instr = instructions[i];
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int[] targets = instr.getBranchTargets();
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for (int j = 0; j < targets.length; j++) {
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addBackEdge(targets[j], i);
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}
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ExceptionHandler[] hs = handlers[i];
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for (int j = 0; j < hs.length; j++) {
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addBackEdge(hs[j].getHandler(), i);
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}
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}
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for (int i = 0; i < backEdges.length; i++) {
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int[] back = backEdges[i];
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if (back == null) {
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backEdges[i] = noEdges;
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} else if (back[back.length - 1] < 0) {
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int j = back.length;
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while (back[j - 1] < 0) {
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j--;
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}
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int[] newBack = new int[j];
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System.arraycopy(back, 0, newBack, 0, newBack.length);
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backEdges[i] = newBack;
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}
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}
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return backEdges;
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}
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private String patchType(String t) {
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if (t == thisType) {
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return classType;
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} else if (t != null && t.startsWith("#")) {
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return stripSharp(t);
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} else {
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return t;
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}
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}
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final public boolean isSubtypeOf(String t1, String t2) {
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return ClassHierarchy.isSubtypeOf(hierarchy, patchType(t1), patchType(t2)) != ClassHierarchy.NO;
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}
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private static boolean isPrimitive(String type) {
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return type != null && (!type.startsWith("L") && !type.startsWith("["));
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}
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final public String findCommonSupertype(String t1, String t2) {
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if (String.valueOf(t1).equals(String.valueOf(t2))) {
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return t1;
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}
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if (String.valueOf(t1).equals("L;") || String.valueOf(t2).equals("L;")) {
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if (String.valueOf(t1).equals("L;")) {
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return t2;
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} else {
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return t1;
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}
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}
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if (t1 == thisType || t2 == thisType || t1 == topType || t2 == topType) {
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return topType;
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}
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if (isPrimitive(t1) != isPrimitive(t2)) {
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return topType;
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}
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String x = ClassHierarchy.findCommonSupertype(hierarchy, patchType(t1), patchType(t2));
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return x;
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}
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final public BitSet getBasicBlockStarts() {
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if (basicBlockStarts != null) {
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return basicBlockStarts;
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}
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BitSet r = new BitSet(instructions.length);
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r.set(0);
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for (int i = 0; i < instructions.length; i++) {
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int[] targets = instructions[i].getBranchTargets();
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for (int j = 0; j < targets.length; j++) {
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r.set(targets[j]);
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}
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}
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for (int i = 0; i < handlers.length; i++) {
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ExceptionHandler[] hs = handlers[i];
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if (hs != null) {
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for (int j = 0; j < hs.length; j++) {
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r.set(hs[j].getHandler());
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}
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}
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}
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basicBlockStarts = r;
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return r;
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}
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final public IInstruction[] getInstructions() {
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return instructions;
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}
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private void getReachableRecursive(int from, BitSet reachable, boolean followHandlers, BitSet mask)
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throws IllegalArgumentException {
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if (from < 0) {
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throw new IllegalArgumentException("from < 0");
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}
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while (true) {
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// stop if we've already visited this instruction or if we've gone outside
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// the mask
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if (reachable.get(from) || (mask != null && !mask.get(from))) {
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return;
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}
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reachable.set(from);
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IInstruction instr = instructions[from];
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int[] targets = instr.getBranchTargets();
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for (int i = 0; i < targets.length; i++) {
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getReachableRecursive(targets[i], reachable, followHandlers, mask);
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}
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if (followHandlers) {
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ExceptionHandler[] hs = handlers[from];
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for (int i = 0; i < hs.length; i++) {
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getReachableRecursive(hs[i].getHandler(), reachable, followHandlers, mask);
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}
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}
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if (instr.isFallThrough()) {
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++from;
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continue;
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}
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break;
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}
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}
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final public BitSet getReachableFrom(int from) {
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return getReachableFrom(from, true, null);
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}
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final public void getReachableFromUpdate(int from, BitSet reachable, boolean followHandlers, BitSet mask) {
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if (reachable == null) {
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throw new IllegalArgumentException("reachable is null");
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}
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reachable.clear();
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getReachableRecursive(from, reachable, followHandlers, mask);
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}
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final public BitSet getReachableFrom(int from, boolean followHandlers, BitSet mask) {
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BitSet reachable = new BitSet();
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getReachableRecursive(from, reachable, followHandlers, mask);
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return reachable;
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}
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private void getReachingRecursive(int to, BitSet reaching, BitSet mask) {
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while (true) {
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// stop if we've already visited this instruction or if we've gone outside
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// the mask
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if (reaching.get(to) || (mask != null && !mask.get(to))) {
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return;
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}
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reaching.set(to);
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int[] targets = backEdges[to];
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for (int i = 0; i < targets.length; i++) {
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getReachingRecursive(targets[i], reaching, mask);
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}
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if (to > 0 && instructions[to - 1].isFallThrough()) {
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--to;
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continue;
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}
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break;
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}
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}
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private void getReachingBase(int to, BitSet reaching, BitSet mask) {
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int[] targets = backEdges[to];
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for (int i = 0; i < targets.length; i++) {
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getReachingRecursive(targets[i], reaching, mask);
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}
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if (to > 0 && instructions[to - 1].isFallThrough()) {
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getReachingRecursive(to - 1, reaching, mask);
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}
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}
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final public void getReachingToUpdate(int to, BitSet reaching, BitSet mask) {
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if (reaching == null) {
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throw new IllegalArgumentException("reaching is null");
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}
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getBackEdges();
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reaching.clear();
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getReachingBase(to, reaching, mask);
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}
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final BitSet getReachingTo(int to, BitSet mask) {
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getBackEdges();
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BitSet reaching = new BitSet();
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getReachingBase(to, reaching, mask);
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return reaching;
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}
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final BitSet getReachingTo(int to) {
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return getReachingTo(to, null);
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}
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private void computeStackSizesAt(int[] stackSizes, int i, int size) throws FailureException {
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while (true) {
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if (stackSizes[i] >= 0) {
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if (size != stackSizes[i]) {
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throw new FailureException(i, "Stack size mismatch", null);
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}
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return;
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}
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stackSizes[i] = size;
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IInstruction instr = instructions[i];
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if (instr instanceof DupInstruction) {
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size += ((DupInstruction) instr).getSize();
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} else if (instr instanceof SwapInstruction) {
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} else {
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size -= instr.getPoppedCount();
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if (instr.getPushedWordSize() > 0) {
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size++;
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}
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}
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int[] targets = instr.getBranchTargets();
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for (int j = 0; j < targets.length; j++) {
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computeStackSizesAt(stackSizes, targets[j], size);
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}
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ExceptionHandler[] hs = handlers[i];
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for (int j = 0; j < hs.length; j++) {
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computeStackSizesAt(stackSizes, hs[j].getHandler(), 1);
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}
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if (!instr.isFallThrough()) {
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return;
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}
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i++;
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}
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}
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/**
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* This exception is thrown by verify() when it fails.
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*/
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public static final class FailureException extends Exception {
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private static final long serialVersionUID = -7663520961403117526L;
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final private int offset;
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final private String reason;
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private List<PathElement> path;
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FailureException(int offset, String reason, List<PathElement> path) {
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super(reason + " at offset " + offset);
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this.offset = offset;
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this.reason = reason;
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this.path = path;
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}
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/**
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* @return the index of the Instruction which failed to verify
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*/
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public int getOffset() {
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return offset;
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}
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/**
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* @return a description of the reason why verification failed
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*/
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public String getReason() {
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return reason;
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}
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/**
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* @return a list of PathElements describing how the type that caused the error was propagated from its origin to the point of
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* the error
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*/
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public List<PathElement> getPath() {
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return path;
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}
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void setPath(List<PathElement> path) {
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this.path = path;
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}
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/**
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* Print the path to the given stream, if there is one.
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*/
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public void printPath(Writer w) throws IOException {
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if (path != null) {
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for (int i = 0; i < path.size(); i++) {
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PathElement elem = path.get(i);
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String[] stack = elem.stack;
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String[] locals = elem.locals;
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w.write("Offset " + elem.index + ": [");
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for (int j = 0; j < stack.length; j++) {
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if (j > 0) {
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w.write(",");
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}
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w.write(stack[j]);
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}
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w.write("], [");
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for (int j = 0; j < locals.length; j++) {
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if (j > 0) {
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w.write(",");
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}
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w.write(locals[j] == null ? "?" : locals[j]);
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}
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w.write("]\n");
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}
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}
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}
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}
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public static final class PathElement {
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final int index;
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final String[] stack;
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final String[] locals;
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PathElement(int index, String[] stack, String[] locals) {
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this.stack = stack.clone();
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this.locals = locals.clone();
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this.index = index;
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}
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/**
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* @return the bytecode offset of the instruction causing a value transfer.
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*/
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public int getIndex() {
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return index;
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}
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/**
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* @return the types of the local variabls at the instruction.
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*/
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public String[] getLocals() {
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return locals;
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}
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/**
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* @return the types of the working stack at the instruction.
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*/
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public String[] getStack() {
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return stack;
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}
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}
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private static String[] cutArray(String[] a, int len) {
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if (len == 0) {
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return noStrings;
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} else {
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String[] r = new String[len];
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System.arraycopy(a, 0, r, 0, len);
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return r;
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}
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}
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private boolean mergeTypes(int i, String[] curStack, int curStackSize, String[] curLocals, int curLocalsSize,
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List<PathElement> path) throws FailureException {
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boolean a = mergeStackTypes(i, curStack, curStackSize, path);
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boolean b = mergeLocalTypes(i, curLocals, curLocalsSize, path);
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return a||b;
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}
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private static boolean longType(String type) {
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return Constants.TYPE_long.equals(type) || Constants.TYPE_double.equals(type);
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}
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private boolean mergeStackTypes(int i, String[] curStack, int curStackSize, List<PathElement> path) throws FailureException {
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boolean changed = false;
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if (stacks[i] == null) {
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stacks[i] = cutArray(curStack, curStackSize);
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changed = true;
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} else {
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String[] st = stacks[i];
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if (st.length != curStackSize) {
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throw new FailureException(i, "Stack size mismatch: " + st.length + ", " + curStackSize, path);
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}
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for (int j = 0; j < curStackSize; j++) {
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String t = findCommonSupertype(st[j], curStack[j]);
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if (t != st[j]) {
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if (t == null) {
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throw new FailureException(i, "Stack type mismatch at " + j + " (" + st[j] + " vs " + curStack[j] + ")", path);
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}
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st[j] = t;
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changed = true;
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}
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}
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}
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return changed;
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}
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private boolean mergeLocalTypes(int i, String[] curLocals, int curLocalsSize, List<PathElement> path) {
|
|
boolean changed = false;
|
|
|
|
if (locals[i] == null) {
|
|
locals[i] = cutArray(curLocals, curLocalsSize);
|
|
changed = true;
|
|
} else {
|
|
String[] ls = locals[i];
|
|
for (int lj = 0, cj = 0; lj < ls.length; lj++, cj++) {
|
|
String t = findCommonSupertype(ls[lj], curLocals[cj]);
|
|
if (t != ls[lj]) {
|
|
ls[lj] = t;
|
|
changed = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return changed;
|
|
}
|
|
|
|
public static String stripSharp(String type) {
|
|
return type.substring(type.lastIndexOf('#')+1);
|
|
}
|
|
|
|
/**
|
|
* A PathElement describes a point where a value is moved from one location to another.
|
|
*/
|
|
private void computeTypes(int i, TypeVisitor visitor, BitSet makeTypesAt, List<PathElement> path) throws FailureException {
|
|
final String[] curStack = new String[maxStack];
|
|
final String[] curLocals = new String[maxLocals];
|
|
|
|
while (true) {
|
|
if (path != null) {
|
|
path.add(new PathElement(i, stacks[i], locals[i]));
|
|
}
|
|
|
|
int curStackSize = stacks[i].length;
|
|
System.arraycopy(stacks[i], 0, curStack, 0, curStackSize);
|
|
|
|
final int[] curLocalsSize = { locals[i].length };
|
|
System.arraycopy(locals[i], 0, curLocals, 0, curLocalsSize[0]);
|
|
|
|
IInstruction.Visitor localsUpdate = new IInstruction.Visitor() {
|
|
|
|
@Override
|
|
public void visitInvoke(IInvokeInstruction instruction) {
|
|
if (instruction.getInvocationCode() == Dispatch.SPECIAL) {
|
|
if (instruction.getMethodName().equals("<init>")) {
|
|
int sz = Util.getParamsTypes(instruction.getClassType(), instruction.getMethodSignature()).length;
|
|
|
|
if (isConstructor) {
|
|
if (thisType.equals(curStack[ sz-1 ])) {
|
|
for(int i = 0; i < curLocals.length; i++) {
|
|
if (thisType.equals(curLocals[i])) {
|
|
curLocals[i] = classType;
|
|
}
|
|
}
|
|
for(int i = 0; i < curStack.length; i++) {
|
|
if (thisType.equals(curStack[i])) {
|
|
curStack[i] = classType;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (curStack.length > sz && curStack[sz] != null && curStack[sz].startsWith("#")) {
|
|
curStack[sz] = stripSharp(curStack[sz]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void visitLocalLoad(ILoadInstruction instruction) {
|
|
String t = curLocals[instruction.getVarIndex()];
|
|
curStack[0] = t;
|
|
}
|
|
|
|
@Override
|
|
public void visitLocalStore(IStoreInstruction instruction) {
|
|
int index = instruction.getVarIndex();
|
|
String t = curStack[0];
|
|
curLocals[index] = t;
|
|
if (longType(t) && curLocals.length > index+1) {
|
|
curLocals[index+1] = null;
|
|
}
|
|
if (index >= curLocalsSize[0]) {
|
|
curLocalsSize[0] = index + (longType(t) && curLocals.length > index+1? 2: 1);
|
|
}
|
|
}
|
|
};
|
|
|
|
boolean restart = false;
|
|
while (true) {
|
|
IInstruction instr = instructions[i];
|
|
int popped = instr.getPoppedCount();
|
|
|
|
if (curStackSize < popped) {
|
|
throw new FailureException(i, "Stack underflow", path);
|
|
}
|
|
|
|
if (visitor != null) {
|
|
visitor.setState(i, path, curStack, curLocals);
|
|
instr.visit(visitor);
|
|
if (!visitor.shouldContinue()) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (instr instanceof DupInstruction) {
|
|
DupInstruction d = (DupInstruction) instr;
|
|
int size = d.getSize();
|
|
|
|
System.arraycopy(curStack, popped, curStack, popped + size, curStackSize - popped);
|
|
System.arraycopy(curStack, 0, curStack, popped, size);
|
|
curStackSize += size;
|
|
} else if (instr instanceof SwapInstruction) {
|
|
String s = curStack[0];
|
|
curStack[0] = curStack[1];
|
|
curStack[1] = s;
|
|
} else {
|
|
String pushed = instr.getPushedType(curStack);
|
|
if (instr instanceof NewInstruction && ! pushed.startsWith("[")) {
|
|
pushed = "#" + instToBC[i] + "#" + pushed;
|
|
}
|
|
if (pushed != null) {
|
|
System.arraycopy(curStack, popped, curStack, 1, curStackSize - popped);
|
|
curStack[0] = Util.getStackType(pushed);
|
|
instr.visit(localsUpdate); // visit localLoad after pushing
|
|
curStackSize -= popped - 1;
|
|
} else {
|
|
instr.visit(localsUpdate); // visit localStore before popping
|
|
System.arraycopy(curStack, popped, curStack, 0, curStackSize - popped);
|
|
curStackSize -= popped;
|
|
|
|
if (varTypes != null) {
|
|
if (instr instanceof IStoreInstruction) {
|
|
int local = ((IStoreInstruction)instr).getVarIndex();
|
|
if (Constants.TYPE_null.equals(curLocals[local])) {
|
|
for(int idx : new int[]{i, i+1}) {
|
|
int bc = instToBC[idx];
|
|
if (bc == 667 && local == 16) {
|
|
System.err.println("got here");
|
|
}
|
|
if (bc != -1 && varTypes != null && varTypes.length > bc && varTypes[bc] != null) {
|
|
if (varTypes[bc].length > local && varTypes[bc][local] != null) {
|
|
String declaredType = varTypes[bc][local];
|
|
curLocals[local] = declaredType;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ExceptionHandler[] handler = handlers[i];
|
|
for(int h = 0; h < handler.length; h++) {
|
|
int target = handler[h].getHandler();
|
|
String cls = handler[h].getCatchClass();
|
|
if (cls == null) {
|
|
cls = "Ljava/lang/Throwable;";
|
|
}
|
|
String[] catchStack = new String[]{ cls };
|
|
if (mergeTypes(target, catchStack, 1, curLocals, curLocalsSize[0], path)) {
|
|
computeTypes(target, visitor, makeTypesAt, path);
|
|
}
|
|
}
|
|
|
|
int[] targets = instr.getBranchTargets();
|
|
for (int j = 0; j < targets.length; j++) {
|
|
if (targets[j] == 29 && classType.contains("MetaClassImpl;") && signature.contains("(Ljava/lang/String;Lorg/codehaus/groovy/reflection/CachedClass;)")) {
|
|
System.err.println("got here");
|
|
}
|
|
if (mergeTypes(targets[j], curStack, curStackSize, curLocals, curLocalsSize[0], path)) {
|
|
computeTypes(targets[j], visitor, makeTypesAt, path);
|
|
}
|
|
}
|
|
|
|
if (!instr.isFallThrough()) {
|
|
break;
|
|
} else {
|
|
i++;
|
|
if (makeTypesAt.get(i)) {
|
|
if (mergeTypes(i, curStack, curStackSize, curLocals, curLocalsSize[0], path)) {
|
|
restart = true;
|
|
break;
|
|
}
|
|
if (path != null) {
|
|
path.remove(path.size() - 1);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
if (!restart) {
|
|
break;
|
|
}
|
|
}
|
|
if (path != null) {
|
|
path.remove(path.size() - 1);
|
|
}
|
|
}
|
|
|
|
public int[] getStackSizes() throws FailureException {
|
|
if (stackSizes != null) {
|
|
return stackSizes;
|
|
}
|
|
|
|
stackSizes = new int[instructions.length];
|
|
|
|
for (int i = 0; i < stackSizes.length; i++) {
|
|
stackSizes[i] = -1;
|
|
}
|
|
computeStackSizesAt(stackSizes, 0, 0);
|
|
|
|
return stackSizes;
|
|
}
|
|
|
|
private void computeMaxLocals() {
|
|
maxLocals = locals[0].length;
|
|
for (int i = 0; i < instructions.length; i++) {
|
|
IInstruction instr = instructions[i];
|
|
if (instr instanceof LoadInstruction) {
|
|
maxLocals = Math.max(maxLocals, ((LoadInstruction) instr).getVarIndex() + 1);
|
|
} else if (instr instanceof StoreInstruction) {
|
|
maxLocals = Math.max(maxLocals, ((StoreInstruction) instr).getVarIndex() + 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
final protected void initTypeInfo() throws FailureException {
|
|
stacks = new String[instructions.length][];
|
|
locals = new String[instructions.length][];
|
|
|
|
String thisType;
|
|
if (isConstructor) {
|
|
thisType = Analyzer.thisType;
|
|
} else {
|
|
thisType = classType;
|
|
}
|
|
|
|
stacks[0] = noStrings;
|
|
locals[0] = Util.getParamsTypesInLocals(isStatic ? null : thisType, signature);
|
|
if (isConstructor) {
|
|
for(int i = 0; i < locals[0].length; i++) {
|
|
if (classType.equals(locals[0][i])) {
|
|
locals[0][i] = thisType;
|
|
}
|
|
}
|
|
}
|
|
int[] stackSizes = getStackSizes();
|
|
maxStack = 0;
|
|
for (int i = 0; i < stackSizes.length; i++) {
|
|
maxStack = Math.max(maxStack, stackSizes[i]);
|
|
}
|
|
computeMaxLocals();
|
|
}
|
|
|
|
/**
|
|
* Verify the method and compute types at every program point.
|
|
*
|
|
* @throws FailureException the method contains invalid bytecode
|
|
*/
|
|
final public void computeTypes(TypeVisitor v, BitSet makeTypesAt, boolean wantPath) throws FailureException {
|
|
initTypeInfo();
|
|
computeTypes(0, v, makeTypesAt, wantPath ? new ArrayList<PathElement>() : null);
|
|
}
|
|
|
|
public abstract class TypeVisitor extends IInstruction.Visitor {
|
|
public abstract void setState(int index, List<PathElement> path, String[] curStack, String[] curLocals);
|
|
|
|
public abstract boolean shouldContinue();
|
|
}
|
|
|
|
/**
|
|
* @return an array indexed by instruction index; each entry is an array of Strings giving the types of the locals at that
|
|
* instruction.
|
|
*/
|
|
final public String[][] getLocalTypes() {
|
|
return locals;
|
|
}
|
|
|
|
/**
|
|
* @return an array indexed by instruction index; each entry is an array of Strings giving the types of the stack elements at that
|
|
* instruction. The top of the stack is the last element of the array.
|
|
*/
|
|
final public String[][] getStackTypes() {
|
|
return stacks;
|
|
}
|
|
|
|
protected Analyzer(MethodData info) {
|
|
this(info.getName().equals("<init>"), info.getIsStatic(), info.getClassType(), info.getSignature(), info.getInstructions(), info.getHandlers(), info.getInstructionsToBytecodes(), null);
|
|
}
|
|
|
|
protected Analyzer(MethodData info, int[] instToBC, String[][] vars) {
|
|
this(info.getName().equals("<init>"), info.getIsStatic(), info.getClassType(), info.getSignature(), info.getInstructions(), info.getHandlers(), instToBC, vars);
|
|
}
|
|
|
|
public static Analyzer createAnalyzer(MethodData info) {
|
|
if (info == null) {
|
|
throw new IllegalArgumentException("info is null");
|
|
}
|
|
return new Analyzer(info);
|
|
}
|
|
|
|
}
|