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/*
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* Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/*
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* An extension of BinaryCode that allows code to be printed.
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* Includes printing of disassembled byte codes, exception info,
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* local variable and line number info.
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*
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*/
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package ilib;
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import java.io.ByteArrayInputStream;
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import java.io.CharArrayWriter;
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import java.io.DataInputStream;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.io.PrintStream;
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import java.util.Map;
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import java.util.HashMap;
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class InjectBytecodes implements RuntimeConstants {
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private final ClassReaderWriter c;
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private final PrintStream output;
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private final int length;
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private final int[] map;
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private final byte[] widening;
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private final Injector[] before = new Injector[256];
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private final Injector[] after = new Injector[256];
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private final String className;
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private final String methodName;
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private final Map<Integer,byte[]> snippets = new HashMap<Integer,byte[]>();
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private int pos;
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private int newPos;
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private class Span {
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final int delta;
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final int target;
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final int newDelta;
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final int newTarget;
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Span(int delta) {
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this.delta = delta;
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this.target = pos + delta;
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this.newTarget = map[target];
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this.newDelta = newTarget - newPos;
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}
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}
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/**
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* Constructor
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*/
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InjectBytecodes(ClassReaderWriter c, int length,
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String className, String methodName) {
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this.c = c;
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this.output = System.out;
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this.length = length;
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this.map = new int[length + 1];
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this.widening = new byte[length + 1];
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this.className = className;
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this.methodName = methodName;
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c.markLocalPositionStart();
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for (int i = 0; i <= length; ++i) {
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map[i] = i;
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}
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}
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public void inject(int at, byte[] newCode) {
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snippets.put(new Integer(at), newCode);
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trace("external ");
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inject(at, newCode.length);
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}
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private void inject(int at, int len) {
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if (Inject.verbose) {
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traceln("Injecting " + len + " at " + at);
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}
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for (int i = at; i <= length; ++i) {
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map[i] += len;
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}
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}
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private void widen(int at, int len) {
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int delta = len - widening[at];
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if (Inject.verbose) {
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traceln();
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traceln("Widening to " + len + " at " + at);
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}
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inject(c.localPosition(), delta); // inject at end of instruction
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widening[at] = (byte)len; // mark at beginning of instruction
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}
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public void injectBefore(int code, Injector inj) {
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before[code] = inj;
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}
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public void injectAfter(int code, Injector inj) {
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after[code] = inj;
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}
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private void trace(String str) {
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if (Inject.verbose) {
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output.print(str);
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}
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}
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private void traceln(String str) {
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if (Inject.verbose) {
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output.println(str);
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}
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}
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private void traceln() {
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if (Inject.verbose) {
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output.println();
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}
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}
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private void trace(int i) {
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if (Inject.verbose) {
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output.print(i);
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}
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}
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/**
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* Print an integer so that it takes 'length' characters in
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* the output. Temporary until formatting code is stable.
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*/
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private void traceFixedWidthInt(int x, int length) {
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if (Inject.verbose) {
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CharArrayWriter baStream = new CharArrayWriter();
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PrintWriter pStream = new PrintWriter(baStream);
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pStream.print(x);
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String str = baStream.toString();
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for (int cnt = length - str.length(); cnt > 0; --cnt)
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trace(" ");
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trace(str);
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}
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}
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void adjustOffsets() throws IOException {
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if (Inject.verbose) {
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traceln();
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traceln("Method " + methodName);
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traceln();
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}
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c.rewind();
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while (c.localPosition() < length) {
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insertAtInstruction();
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}
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trace("Searching for adjustments...");
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c.rewind();
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while (c.localPosition() < length) {
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if (!adjustInstruction()) {
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c.rewind();
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traceln();
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traceln("Restarting adjustments after change...");
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}
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}
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// write the new bytecodes
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traceln();
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traceln();
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trace("Writing new code...");
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c.rewind();
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while (c.localPosition() < length) {
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writeInstruction();
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}
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if (!snippets.isEmpty()) {
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throw new Error("not all snippets written");
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}
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}
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/**
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* Walk one instruction inserting instrumentation at specified instructions
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*/
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private void insertAtInstruction() throws IOException {
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pos = c.localPosition();
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int opcode = c.readU1();
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if (opcode == opc_wide) {
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// no support for instrumenting wide instructions
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int wopcode = c.readU1();
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int lvIndex = c.readU2();
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switch (wopcode) {
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case opc_aload: case opc_astore:
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case opc_fload: case opc_fstore:
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case opc_iload: case opc_istore:
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case opc_lload: case opc_lstore:
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case opc_dload: case opc_dstore:
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case opc_ret:
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break;
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case opc_iinc:
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c.readS2();
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break;
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default:
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throw new Error("Invalid wide opcode: " + wopcode);
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}
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} else {
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Injector inj;
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inj = before[opcode];
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if (inj != null) {
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inject(pos, inj.bytecodes(className, methodName, pos));
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}
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switch (opcode) {
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case opc_tableswitch:{
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int header = (pos+1+3) & (~3); // 4byte boundry
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c.skip(header - (pos+1)); // skip old padding
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c.readU4();
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int low = c.readU4();
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int high = c.readU4();
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c.skip((high+1-low) * 4);
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break;
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}
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case opc_lookupswitch:{
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int header = (pos+1+3) & (~3); // 4byte boundry
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c.skip(header - (pos+1)); // skip padding
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c.readU4();
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int npairs = c.readU4();
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c.skip(npairs * 8);
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break;
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}
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default: {
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int instrLen = opcLengths[opcode];
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c.skip(instrLen-1);
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}
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}
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inj = after[opcode];
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if (inj != null) {
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pos = c.localPosition();
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inject(pos, inj.bytecodes(className, methodName, pos));
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}
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}
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}
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/**
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* Walk one instruction adjusting for insertions
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*/
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private boolean adjustInstruction() throws IOException {
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pos = c.localPosition();
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newPos = map[pos];
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int opcode = c.readU1();
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if (Inject.verbose) {
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traceln();
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traceFixedWidthInt(pos, 4);
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traceFixedWidthInt(newPos, 4);
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trace(" ");
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}
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if (opcode == opc_wide) {
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int wopcode = c.readU1();
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int lvIndex = c.readU2();
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if (Inject.verbose) {
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trace(opcNames[wopcode] + "_w ");
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}
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switch (wopcode) {
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case opc_aload: case opc_astore:
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case opc_fload: case opc_fstore:
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case opc_iload: case opc_istore:
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case opc_lload: case opc_lstore:
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case opc_dload: case opc_dstore:
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case opc_ret:
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trace(lvIndex);
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break;
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case opc_iinc:
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int constVal = c.readS2();
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if (Inject.verbose) {
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trace(lvIndex + " " + constVal);
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}
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break;
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default:
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throw new Error("Invalid wide opcode: " + wopcode);
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}
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} else {
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if (Inject.verbose) {
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trace(opcNames[opcode]);
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}
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switch (opcode) {
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case opc_tableswitch:{
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int widened = widening[pos];
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int header = (pos+1+3) & (~3); // 4byte boundry
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int newHeader = (newPos+1+3) & (~3); // 4byte boundry
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c.skip(header - (pos+1)); // skip old padding
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Span defaultSkip = new Span(c.readU4());
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int low = c.readU4();
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int high = c.readU4();
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if (Inject.verbose) {
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trace(" " + low + " to " + high);
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trace(": default= [was] " + defaultSkip.target);
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trace(" [now] " + defaultSkip.newTarget);
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for (int i = low; i <= high; ++i) {
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Span jump = new Span(c.readU4());
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traceln("");
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trace('\t');
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traceFixedWidthInt(i, 5);
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trace(": " + jump.newTarget);
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}
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} else {
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c.skip((high+1-low) * 4);
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}
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int newPadding = newHeader - newPos;
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int oldPadding = header - pos;
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int deltaPadding = newPadding - oldPadding;
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if (widened != deltaPadding) {
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widen(pos, deltaPadding);
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return false; // cause restart
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}
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break;
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}
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case opc_lookupswitch:{
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int widened = widening[pos];
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int header = (pos+1+3) & (~3); // 4byte boundry
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int newHeader = (newPos+1+3) & (~3); // 4byte boundry
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c.skip(header - (pos+1)); // skip old padding
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Span defaultSkip = new Span(c.readU4());
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int npairs = c.readU4();
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if (Inject.verbose) {
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trace(" npairs: " + npairs);
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trace(": default= [was] " + defaultSkip.target);
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trace(" [now] " + defaultSkip.newTarget);
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for (int i = 0; i< npairs; ++i) {
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int match = c.readU4();
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Span jump = new Span(c.readU4());
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traceln("");
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trace('\t');
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traceFixedWidthInt(match, 5);
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trace(": " + jump.newTarget);
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}
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} else {
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c.skip(npairs * 8);
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}
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int newPadding = newHeader - newPos;
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int oldPadding = header - pos;
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int deltaPadding = newPadding - oldPadding;
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if (widened != deltaPadding) {
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widen(pos, deltaPadding);
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return false; // cause restart
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}
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break;
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}
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case opc_jsr: case opc_goto:
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case opc_ifeq: case opc_ifge: case opc_ifgt:
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case opc_ifle: case opc_iflt: case opc_ifne:
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case opc_if_icmpeq: case opc_if_icmpne: case opc_if_icmpge:
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case opc_if_icmpgt: case opc_if_icmple: case opc_if_icmplt:
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380 |
case opc_if_acmpeq: case opc_if_acmpne:
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case opc_ifnull: case opc_ifnonnull: {
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int widened = widening[pos];
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383 |
Span jump = new Span(c.readS2());
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384 |
if (widened == 0) { // not yet widened
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int newDelta = jump.newDelta;
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if ((newDelta < -32768) || (newDelta > 32767)) {
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387 |
switch (opcode) {
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388 |
case opc_jsr: case opc_goto:
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389 |
widen(pos, 2); // will convert to wide
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390 |
break;
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391 |
default:
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392 |
widen(pos, 5); // will inject goto_w
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|
393 |
break;
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|
394 |
}
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|
395 |
return false; // cause restart
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|
396 |
}
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|
397 |
}
|
|
398 |
if (Inject.verbose) {
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|
399 |
trace(" [was] " + jump.target + " ==> " +
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400 |
" [now] " + jump.newTarget);
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401 |
}
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|
402 |
break;
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|
403 |
}
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404 |
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|
405 |
case opc_jsr_w:
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|
406 |
case opc_goto_w: {
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|
407 |
Span jump = new Span(c.readU4());
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|
408 |
if (Inject.verbose) {
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|
409 |
trace(" [was] " + jump.target +
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|
410 |
" [now] " + jump.newTarget);
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|
411 |
}
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|
412 |
break;
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|
413 |
}
|
|
414 |
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415 |
default: {
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|
416 |
int instrLen = opcLengths[opcode];
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|
417 |
c.skip(instrLen-1);
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|
418 |
break;
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|
419 |
}
|
|
420 |
}
|
|
421 |
}
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|
422 |
return true; // successful return
|
|
423 |
}
|
|
424 |
|
|
425 |
|
|
426 |
/**
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|
427 |
* Walk one instruction writing the transformed instruction.
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|
428 |
*/
|
|
429 |
private void writeInstruction() throws IOException {
|
|
430 |
pos = c.localPosition();
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|
431 |
newPos = map[pos];
|
|
432 |
byte[] newCode = snippets.remove(new Integer(pos));
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|
433 |
if (newCode != null) {
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|
434 |
traceln();
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|
435 |
traceFixedWidthInt(pos, 4);
|
|
436 |
trace(" ... -- Inserting new code");
|
|
437 |
c.writeBytes(newCode);
|
|
438 |
}
|
|
439 |
int opcode = c.readU1();
|
|
440 |
if (Inject.verbose) {
|
|
441 |
traceln();
|
|
442 |
traceFixedWidthInt(pos, 4);
|
|
443 |
traceFixedWidthInt(newPos, 4);
|
|
444 |
trace(" ");
|
|
445 |
}
|
|
446 |
if (opcode == opc_wide) {
|
|
447 |
int wopcode = c.readU1();
|
|
448 |
int lvIndex = c.readU2();
|
|
449 |
if (Inject.verbose) {
|
|
450 |
trace(opcNames[wopcode] + "_w ");
|
|
451 |
}
|
|
452 |
c.writeU1(opcode);
|
|
453 |
c.writeU1(wopcode);
|
|
454 |
c.writeU2(lvIndex);
|
|
455 |
switch (wopcode) {
|
|
456 |
case opc_aload: case opc_astore:
|
|
457 |
case opc_fload: case opc_fstore:
|
|
458 |
case opc_iload: case opc_istore:
|
|
459 |
case opc_lload: case opc_lstore:
|
|
460 |
case opc_dload: case opc_dstore:
|
|
461 |
case opc_ret:
|
|
462 |
trace(lvIndex);
|
|
463 |
break;
|
|
464 |
|
|
465 |
case opc_iinc:
|
|
466 |
int constVal = c.readS2();
|
|
467 |
c.writeU2(constVal); // ??? U vs S
|
|
468 |
if (Inject.verbose) {
|
|
469 |
trace(lvIndex + " " + constVal);
|
|
470 |
}
|
|
471 |
break;
|
|
472 |
default:
|
|
473 |
throw new Error("Invalid wide opcode: " + wopcode);
|
|
474 |
}
|
|
475 |
} else {
|
|
476 |
if (Inject.verbose) {
|
|
477 |
trace(opcNames[opcode]);
|
|
478 |
}
|
|
479 |
switch (opcode) {
|
|
480 |
|
|
481 |
case opc_tableswitch:{
|
|
482 |
int header = (pos+1+3) & (~3); // 4byte boundry
|
|
483 |
int newHeader = (newPos+1+3) & (~3); // 4byte boundry
|
|
484 |
|
|
485 |
c.skip(header - (pos+1)); // skip old padding
|
|
486 |
|
|
487 |
Span defaultSkip = new Span(c.readU4());
|
|
488 |
int low = c.readU4();
|
|
489 |
int high = c.readU4();
|
|
490 |
|
|
491 |
c.writeU1(opcode); // copy instruction
|
|
492 |
for (int i = newPos+1; i < newHeader; ++i) {
|
|
493 |
c.writeU1(0); // write new padding
|
|
494 |
}
|
|
495 |
c.writeU4(defaultSkip.newDelta);
|
|
496 |
c.writeU4(low);
|
|
497 |
c.writeU4(high);
|
|
498 |
|
|
499 |
if (Inject.verbose) {
|
|
500 |
trace(" " + low + " to " + high);
|
|
501 |
trace(": default= [was] " + defaultSkip.target);
|
|
502 |
trace(" [now] " + defaultSkip.newTarget);
|
|
503 |
}
|
|
504 |
for (int i = low; i <= high; ++i) {
|
|
505 |
Span jump = new Span(c.readU4());
|
|
506 |
c.writeU4(jump.newDelta);
|
|
507 |
if (Inject.verbose) {
|
|
508 |
traceln("");
|
|
509 |
trace('\t');
|
|
510 |
traceFixedWidthInt(i, 5);
|
|
511 |
trace(": " + jump.newTarget);
|
|
512 |
}
|
|
513 |
}
|
|
514 |
break;
|
|
515 |
}
|
|
516 |
|
|
517 |
case opc_lookupswitch:{
|
|
518 |
int header = (pos+1+3) & (~3); // 4byte boundry
|
|
519 |
int newHeader = (newPos+1+3) & (~3); // 4byte boundry
|
|
520 |
|
|
521 |
c.skip(header - (pos+1)); // skip old padding
|
|
522 |
|
|
523 |
Span defaultSkip = new Span(c.readU4());
|
|
524 |
int npairs = c.readU4();
|
|
525 |
if (Inject.verbose) {
|
|
526 |
trace(" npairs: " + npairs);
|
|
527 |
trace(": default= [was] " + defaultSkip.target);
|
|
528 |
trace(" [now] " + defaultSkip.newTarget);
|
|
529 |
}
|
|
530 |
c.writeU1(opcode); // copy instruction
|
|
531 |
for (int i = newPos+1; i < newHeader; ++i) {
|
|
532 |
c.writeU1(0); // write new padding
|
|
533 |
}
|
|
534 |
c.writeU4(defaultSkip.newDelta);
|
|
535 |
c.writeU4(npairs);
|
|
536 |
for (int i = 0; i< npairs; ++i) {
|
|
537 |
int match = c.readU4();
|
|
538 |
Span jump = new Span(c.readU4());
|
|
539 |
c.writeU4(match);
|
|
540 |
c.writeU4(jump.newDelta);
|
|
541 |
if (Inject.verbose) {
|
|
542 |
traceln("");
|
|
543 |
trace('\t');
|
|
544 |
traceFixedWidthInt(match, 5);
|
|
545 |
trace(": " + jump.newTarget);
|
|
546 |
}
|
|
547 |
}
|
|
548 |
break;
|
|
549 |
}
|
|
550 |
|
|
551 |
case opc_jsr: case opc_goto:
|
|
552 |
case opc_ifeq: case opc_ifge: case opc_ifgt:
|
|
553 |
case opc_ifle: case opc_iflt: case opc_ifne:
|
|
554 |
case opc_if_icmpeq: case opc_if_icmpne: case opc_if_icmpge:
|
|
555 |
case opc_if_icmpgt: case opc_if_icmple: case opc_if_icmplt:
|
|
556 |
case opc_if_acmpeq: case opc_if_acmpne:
|
|
557 |
case opc_ifnull: case opc_ifnonnull: {
|
|
558 |
int widened = widening[pos];
|
|
559 |
Span jump = new Span(c.readS2());
|
|
560 |
int newOpcode = opcode; // default to unchanged
|
|
561 |
if (widened == 0) { // not widened
|
|
562 |
c.writeU1(opcode); // rewrite instruction
|
|
563 |
c.writeU2(jump.newDelta);
|
|
564 |
} else if (widened == 2) { // wide form
|
|
565 |
switch (opcode) {
|
|
566 |
case opc_jsr:
|
|
567 |
newOpcode = opc_jsr_w;
|
|
568 |
break;
|
|
569 |
case opc_goto:
|
|
570 |
newOpcode = opc_jsr_w;
|
|
571 |
break;
|
|
572 |
default:
|
|
573 |
throw new Error("unexpected opcode: " +
|
|
574 |
opcode);
|
|
575 |
}
|
|
576 |
c.writeU1(newOpcode); // write wide instruction
|
|
577 |
c.writeU4(jump.newDelta); // write new and wide delta
|
|
578 |
} else if (widened == 5) { // insert goto_w
|
|
579 |
switch (opcode) {
|
|
580 |
case opc_ifeq:
|
|
581 |
newOpcode = opc_ifne;
|
|
582 |
break;
|
|
583 |
case opc_ifge:
|
|
584 |
newOpcode = opc_iflt;
|
|
585 |
break;
|
|
586 |
case opc_ifgt:
|
|
587 |
newOpcode = opc_ifle;
|
|
588 |
break;
|
|
589 |
case opc_ifle:
|
|
590 |
newOpcode = opc_ifgt;
|
|
591 |
break;
|
|
592 |
case opc_iflt:
|
|
593 |
newOpcode = opc_ifge;
|
|
594 |
break;
|
|
595 |
case opc_ifne:
|
|
596 |
newOpcode = opc_ifeq;
|
|
597 |
break;
|
|
598 |
case opc_if_icmpeq:
|
|
599 |
newOpcode = opc_if_icmpne;
|
|
600 |
break;
|
|
601 |
case opc_if_icmpne:
|
|
602 |
newOpcode = opc_if_icmpeq;
|
|
603 |
break;
|
|
604 |
case opc_if_icmpge:
|
|
605 |
newOpcode = opc_if_icmplt;
|
|
606 |
break;
|
|
607 |
case opc_if_icmpgt:
|
|
608 |
newOpcode = opc_if_icmple;
|
|
609 |
break;
|
|
610 |
case opc_if_icmple:
|
|
611 |
newOpcode = opc_if_icmpgt;
|
|
612 |
break;
|
|
613 |
case opc_if_icmplt:
|
|
614 |
newOpcode = opc_if_icmpge;
|
|
615 |
break;
|
|
616 |
case opc_if_acmpeq:
|
|
617 |
newOpcode = opc_if_acmpne;
|
|
618 |
break;
|
|
619 |
case opc_if_acmpne:
|
|
620 |
newOpcode = opc_if_acmpeq;
|
|
621 |
break;
|
|
622 |
case opc_ifnull:
|
|
623 |
newOpcode = opc_ifnonnull;
|
|
624 |
break;
|
|
625 |
case opc_ifnonnull:
|
|
626 |
newOpcode = opc_ifnull;
|
|
627 |
break;
|
|
628 |
default:
|
|
629 |
throw new Error("unexpected opcode: " +
|
|
630 |
opcode);
|
|
631 |
}
|
|
632 |
c.writeU1(newOpcode); // write inverse branch
|
|
633 |
c.writeU2(3 + 5); // beyond if and goto_w
|
|
634 |
c.writeU1(opc_goto_w);// add a goto_w
|
|
635 |
c.writeU4(jump.newDelta); // write new and wide delta
|
|
636 |
} else {
|
|
637 |
throw new Error("unexpected widening");
|
|
638 |
}
|
|
639 |
|
|
640 |
if (Inject.verbose) {
|
|
641 |
trace(" [was] " + jump.target + " ==> " +
|
|
642 |
opcNames[newOpcode] +
|
|
643 |
" [now] " + jump.newTarget);
|
|
644 |
}
|
|
645 |
break;
|
|
646 |
}
|
|
647 |
|
|
648 |
case opc_jsr_w:
|
|
649 |
case opc_goto_w: {
|
|
650 |
Span jump = new Span(c.readU4());
|
|
651 |
c.writeU1(opcode); // instruction itself
|
|
652 |
c.writeU4(jump.newDelta);
|
|
653 |
if (Inject.verbose) {
|
|
654 |
trace(" [was] " + jump.target +
|
|
655 |
" [now] " + jump.newTarget);
|
|
656 |
}
|
|
657 |
break;
|
|
658 |
}
|
|
659 |
|
|
660 |
default: {
|
|
661 |
int instrLen = opcLengths[opcode];
|
|
662 |
c.writeU1(opcode); // instruction itself
|
|
663 |
c.copy(instrLen-1);
|
|
664 |
}
|
|
665 |
}
|
|
666 |
}
|
|
667 |
}
|
|
668 |
|
|
669 |
/**
|
|
670 |
* Copy the exception table for this method code
|
|
671 |
*/
|
|
672 |
void copyExceptionTable() throws IOException {
|
|
673 |
int tableLength = c.copyU2(); // exception table len
|
|
674 |
if (tableLength > 0) {
|
|
675 |
traceln();
|
|
676 |
traceln("Exception table:");
|
|
677 |
traceln(" from:old/new to:old/new target:old/new type");
|
|
678 |
for (int tcnt = tableLength; tcnt > 0; --tcnt) {
|
|
679 |
int startPC = c.readU2();
|
|
680 |
int newStartPC = map[startPC];
|
|
681 |
c.writeU2(newStartPC);
|
|
682 |
int endPC = c.readU2();
|
|
683 |
int newEndPC = map[endPC];
|
|
684 |
c.writeU2(newEndPC);
|
|
685 |
int handlerPC = c.readU2();
|
|
686 |
int newHandlerPC = map[handlerPC];
|
|
687 |
c.writeU2(newHandlerPC);
|
|
688 |
int catchType = c.copyU2();
|
|
689 |
if (Inject.verbose) {
|
|
690 |
traceFixedWidthInt(startPC, 6);
|
|
691 |
traceFixedWidthInt(newStartPC, 6);
|
|
692 |
traceFixedWidthInt(endPC, 6);
|
|
693 |
traceFixedWidthInt(newEndPC, 6);
|
|
694 |
traceFixedWidthInt(handlerPC, 6);
|
|
695 |
traceFixedWidthInt(newHandlerPC, 6);
|
|
696 |
trace(" ");
|
|
697 |
if (catchType == 0)
|
|
698 |
traceln("any");
|
|
699 |
else {
|
|
700 |
traceln("" + catchType);
|
|
701 |
}
|
|
702 |
}
|
|
703 |
}
|
|
704 |
}
|
|
705 |
}
|
|
706 |
|
|
707 |
/**
|
|
708 |
* Copy the line number table for this method code
|
|
709 |
*/
|
|
710 |
void copyLineNumberAttr() throws IOException {
|
|
711 |
// name index already read
|
|
712 |
c.copy(4); // attr len
|
|
713 |
int tableLength = c.copyU2(); // line table len
|
|
714 |
if (tableLength > 0) {
|
|
715 |
if (Inject.verbose) {
|
|
716 |
traceln();
|
|
717 |
traceln("Line numbers for method " + methodName);
|
|
718 |
}
|
|
719 |
for (int tcnt = tableLength; tcnt > 0; --tcnt) {
|
|
720 |
int startPC = c.readU2();
|
|
721 |
int newStartPC = map[startPC];
|
|
722 |
c.writeU2(newStartPC);
|
|
723 |
int lineNumber = c.copyU2();
|
|
724 |
if (Inject.verbose) {
|
|
725 |
traceln(" line " + lineNumber +
|
|
726 |
": [was] " + startPC +
|
|
727 |
" [now] " + newStartPC);
|
|
728 |
}
|
|
729 |
}
|
|
730 |
}
|
|
731 |
}
|
|
732 |
|
|
733 |
/**
|
|
734 |
* Copy the local variable table for this method code
|
|
735 |
*/
|
|
736 |
void copyLocalVarAttr() throws IOException {
|
|
737 |
// name index already read
|
|
738 |
c.copy(4); // attr len
|
|
739 |
int tableLength = c.copyU2(); // local var table len
|
|
740 |
if (tableLength > 0) {
|
|
741 |
if (Inject.verbose) {
|
|
742 |
traceln();
|
|
743 |
traceln("Local variables for method " + methodName);
|
|
744 |
}
|
|
745 |
for (int tcnt = tableLength; tcnt > 0; --tcnt) {
|
|
746 |
int startPC = c.readU2();
|
|
747 |
int newStartPC = map[startPC];
|
|
748 |
c.writeU2(newStartPC);
|
|
749 |
int length = c.readU2();
|
|
750 |
int endPC = startPC + length;
|
|
751 |
int newEndPC = map[endPC];
|
|
752 |
int newLength = newEndPC - newStartPC;
|
|
753 |
c.writeU2(newLength);
|
|
754 |
int nameIndex = c.copyU2();
|
|
755 |
int descriptorIndex = c.copyU2();
|
|
756 |
int index = c.copyU2();
|
|
757 |
if (Inject.verbose) {
|
|
758 |
trace(" ");
|
|
759 |
trace(descriptorIndex);
|
|
760 |
trace(" ");
|
|
761 |
trace(nameIndex);
|
|
762 |
traceln(" pc= [was] " + startPC + " [now] " + newStartPC +
|
|
763 |
", length= [was] " + length + " [now] " + newLength +
|
|
764 |
", slot=" + index);
|
|
765 |
}
|
|
766 |
}
|
|
767 |
}
|
|
768 |
}
|
|
769 |
}
|