Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/tools/jcore/ByteCodeRewriter.java @ 3945:8ed53447f690
Merge
author | iveresov |
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date | Thu, 15 Sep 2011 12:44:09 -0700 |
parents | 0a8e0d4345b3 |
children | da91efe96a93 |
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/* * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ package sun.jvm.hotspot.tools.jcore; import sun.jvm.hotspot.oops.*; import sun.jvm.hotspot.interpreter.*; import sun.jvm.hotspot.utilities.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.runtime.*; public class ByteCodeRewriter { private Method method; private ConstantPool cpool; private ConstantPoolCache cpCache; private byte[] code; private Bytes bytes; public static final boolean DEBUG = false; private static final int jintSize = 4; protected void debugMessage(String message) { System.out.println(message); } public ByteCodeRewriter(Method method, ConstantPool cpool, byte[] code) { this.method = method; this.cpool = cpool; this.cpCache = cpool.getCache(); this.code = code; this.bytes = VM.getVM().getBytes(); } protected short getConstantPoolIndex(int rawcode, int bci) { // get ConstantPool index from ConstantPoolCacheIndex at given bci String fmt = Bytecodes.format(rawcode); int cpCacheIndex; switch (fmt.length()) { case 2: cpCacheIndex = method.getBytecodeByteArg(bci); break; case 3: cpCacheIndex = method.getBytecodeShortArg(bci); break; case 5: if (fmt.indexOf("__") >= 0) cpCacheIndex = method.getBytecodeShortArg(bci); else cpCacheIndex = method.getBytecodeIntArg(bci); break; default: throw new IllegalArgumentException(); } if (cpCache == null) { return (short) cpCacheIndex; } else if (fmt.indexOf("JJJJ") >= 0) { // change byte-ordering and go via secondary cache entry return (short) cpCache.getMainEntryAt(bytes.swapInt(cpCacheIndex)).getConstantPoolIndex(); } else if (fmt.indexOf("JJ") >= 0) { // change byte-ordering and go via cache return (short) cpCache.getEntryAt((int) (0xFFFF & bytes.swapShort((short)cpCacheIndex))).getConstantPoolIndex(); } else if (fmt.indexOf("j") >= 0) { // go via cache return (short) cpCache.getEntryAt((int) (0xFF & cpCacheIndex)).getConstantPoolIndex(); } else { return (short) cpCacheIndex; } } static private void writeShort(byte[] buf, int index, short value) { buf[index] = (byte) ((value >> 8) & 0x00FF); buf[index + 1] = (byte) (value & 0x00FF); } public void rewrite() { int bytecode = Bytecodes._illegal; int hotspotcode = Bytecodes._illegal; int len = 0; for (int bci = 0; bci < code.length;) { hotspotcode = Bytecodes.codeAt(method, bci); bytecode = Bytecodes.javaCode(hotspotcode); if (Assert.ASSERTS_ENABLED) { int code_from_buffer = 0xFF & code[bci]; Assert.that(code_from_buffer == hotspotcode || code_from_buffer == Bytecodes._breakpoint, "Unexpected bytecode found in method bytecode buffer!"); } // update the code buffer hotspot specific bytecode with the jvm bytecode code[bci] = (byte) (0xFF & bytecode); short cpoolIndex = 0; switch (bytecode) { // bytecodes with ConstantPoolCache index case Bytecodes._getstatic: case Bytecodes._putstatic: case Bytecodes._getfield: case Bytecodes._putfield: case Bytecodes._invokevirtual: case Bytecodes._invokespecial: case Bytecodes._invokestatic: case Bytecodes._invokeinterface: { cpoolIndex = getConstantPoolIndex(hotspotcode, bci + 1); writeShort(code, bci + 1, cpoolIndex); break; } case Bytecodes._invokedynamic: cpoolIndex = getConstantPoolIndex(hotspotcode, bci + 1); writeShort(code, bci + 1, cpoolIndex); writeShort(code, bci + 3, (short)0); // clear out trailing bytes break; case Bytecodes._ldc_w: if (hotspotcode != bytecode) { // fast_aldc_w puts constant in CP cache cpoolIndex = getConstantPoolIndex(hotspotcode, bci + 1); writeShort(code, bci + 1, cpoolIndex); } break; case Bytecodes._ldc: if (hotspotcode != bytecode) { // fast_aldc puts constant in CP cache cpoolIndex = getConstantPoolIndex(hotspotcode, bci + 1); code[bci + 1] = (byte)(cpoolIndex); } break; } len = Bytecodes.lengthFor(bytecode); if (len <= 0) len = Bytecodes.lengthAt(method, bci); if (DEBUG) { String operand = ""; switch (len) { case 2: operand += code[bci + 1]; break; case 3: operand += (cpoolIndex != 0)? cpoolIndex : method.getBytecodeShortArg(bci + 1); break; case 5: operand += method.getBytecodeIntArg(bci + 1); break; } // the operand following # is not quite like javap output. // in particular, for goto & goto_w, the operand is PC relative // offset for jump. Javap adds relative offset with current PC // to give absolute bci to jump to. String message = "\t\t" + bci + " " + Bytecodes.name(bytecode); if (hotspotcode != bytecode) message += " [" + Bytecodes.name(hotspotcode) + "]"; if (operand != "") message += " #" + operand; if (DEBUG) debugMessage(message); } bci += len; } } }