Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/tools/jcore/ByteCodeRewriter.java @ 1602:136b78722a08
6939203: JSR 292 needs method handle constants
Summary: Add new CP types CONSTANT_MethodHandle, CONSTANT_MethodType; extend 'ldc' bytecode.
Reviewed-by: twisti, never
| author | jrose |
|---|---|
| date | Wed, 09 Jun 2010 18:50:45 -0700 |
| parents | c18cbe5936b8 |
| children | 0a8e0d4345b3 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2002, 2009, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.tools.jcore; | |
| 26 | |
| 27 import sun.jvm.hotspot.oops.*; | |
| 28 import sun.jvm.hotspot.interpreter.*; | |
| 29 import sun.jvm.hotspot.utilities.*; | |
| 30 import sun.jvm.hotspot.debugger.*; | |
| 31 import sun.jvm.hotspot.runtime.*; | |
| 32 | |
| 33 public class ByteCodeRewriter | |
| 34 { | |
| 35 private Method method; | |
| 36 private ConstantPool cpool; | |
| 37 private ConstantPoolCache cpCache; | |
| 38 private byte[] code; | |
| 39 private Bytes bytes; | |
| 40 | |
| 41 public static final boolean DEBUG = false; | |
| 42 private static final int jintSize = 4; | |
| 43 | |
| 44 protected void debugMessage(String message) { | |
| 45 System.out.println(message); | |
| 46 } | |
| 47 | |
| 48 public ByteCodeRewriter(Method method, ConstantPool cpool, byte[] code) { | |
| 49 this.method = method; | |
| 50 this.cpool = cpool; | |
| 51 this.cpCache = cpool.getCache(); | |
| 52 this.code = code; | |
| 53 this.bytes = VM.getVM().getBytes(); | |
| 54 | |
| 55 } | |
| 56 | |
| 1602 | 57 protected short getConstantPoolIndex(int rawcode, int bci) { |
| 0 | 58 // get ConstantPool index from ConstantPoolCacheIndex at given bci |
| 1602 | 59 String fmt = Bytecodes.format(rawcode); |
| 60 int cpCacheIndex; | |
| 61 switch (fmt.length()) { | |
| 62 case 2: cpCacheIndex = method.getBytecodeByteArg(bci); break; | |
| 63 case 3: cpCacheIndex = method.getBytecodeShortArg(bci); break; | |
| 64 case 5: | |
| 65 if (fmt.indexOf("__") >= 0) | |
| 66 cpCacheIndex = method.getBytecodeShortArg(bci); | |
| 67 else | |
| 68 cpCacheIndex = method.getBytecodeIntArg(bci); | |
| 69 break; | |
| 70 default: throw new IllegalArgumentException(); | |
| 71 } | |
| 0 | 72 if (cpCache == null) { |
| 1602 | 73 return (short) cpCacheIndex; |
| 74 } else if (fmt.indexOf("JJJJ") >= 0) { | |
| 75 // change byte-ordering and go via secondary cache entry | |
| 76 return (short) cpCache.getMainEntryAt(bytes.swapInt(cpCacheIndex)).getConstantPoolIndex(); | |
| 77 } else if (fmt.indexOf("JJ") >= 0) { | |
| 78 // change byte-ordering and go via cache | |
| 79 return (short) cpCache.getEntryAt((int) (0xFFFF & bytes.swapShort((short)cpCacheIndex))).getConstantPoolIndex(); | |
| 80 } else if (fmt.indexOf("j") >= 0) { | |
| 81 // go via cache | |
| 82 return (short) cpCache.getEntryAt((int) (0xFF & cpCacheIndex)).getConstantPoolIndex(); | |
| 0 | 83 } else { |
| 1602 | 84 return (short) cpCacheIndex; |
| 0 | 85 } |
| 86 } | |
| 87 | |
| 88 static private void writeShort(byte[] buf, int index, short value) { | |
| 89 buf[index] = (byte) ((value >> 8) & 0x00FF); | |
| 90 buf[index + 1] = (byte) (value & 0x00FF); | |
| 91 } | |
| 92 | |
| 93 public void rewrite() { | |
| 94 int bytecode = Bytecodes._illegal; | |
| 95 int hotspotcode = Bytecodes._illegal; | |
| 96 int len = 0; | |
| 97 | |
| 98 for (int bci = 0; bci < code.length;) { | |
| 99 hotspotcode = Bytecodes.codeAt(method, bci); | |
| 100 bytecode = Bytecodes.javaCode(hotspotcode); | |
| 101 | |
| 102 if (Assert.ASSERTS_ENABLED) { | |
| 103 int code_from_buffer = 0xFF & code[bci]; | |
| 104 Assert.that(code_from_buffer == hotspotcode | |
| 105 || code_from_buffer == Bytecodes._breakpoint, | |
| 106 "Unexpected bytecode found in method bytecode buffer!"); | |
| 107 } | |
| 108 | |
| 109 // update the code buffer hotspot specific bytecode with the jvm bytecode | |
| 110 code[bci] = (byte) (0xFF & bytecode); | |
| 111 | |
| 112 short cpoolIndex = 0; | |
| 113 switch (bytecode) { | |
| 114 // bytecodes with ConstantPoolCache index | |
| 115 case Bytecodes._getstatic: | |
| 116 case Bytecodes._putstatic: | |
| 117 case Bytecodes._getfield: | |
| 118 case Bytecodes._putfield: | |
| 119 case Bytecodes._invokevirtual: | |
| 120 case Bytecodes._invokespecial: | |
| 121 case Bytecodes._invokestatic: | |
| 122 case Bytecodes._invokeinterface: { | |
| 1602 | 123 cpoolIndex = getConstantPoolIndex(hotspotcode, bci + 1); |
| 0 | 124 writeShort(code, bci + 1, cpoolIndex); |
| 125 break; | |
| 126 } | |
| 1602 | 127 |
| 128 case Bytecodes._invokedynamic: | |
| 129 cpoolIndex = getConstantPoolIndex(hotspotcode, bci + 1); | |
| 130 writeShort(code, bci + 1, cpoolIndex); | |
| 131 writeShort(code, bci + 3, (short)0); // clear out trailing bytes | |
| 132 break; | |
| 133 | |
| 134 case Bytecodes._ldc_w: | |
| 135 if (hotspotcode != bytecode) { | |
| 136 // fast_aldc_w puts constant in CP cache | |
| 137 cpoolIndex = getConstantPoolIndex(hotspotcode, bci + 1); | |
| 138 writeShort(code, bci + 1, cpoolIndex); | |
| 139 } | |
| 140 break; | |
| 141 case Bytecodes._ldc: | |
| 142 if (hotspotcode != bytecode) { | |
| 143 // fast_aldc puts constant in CP cache | |
| 144 cpoolIndex = getConstantPoolIndex(hotspotcode, bci + 1); | |
| 145 code[bci + 1] = (byte)(cpoolIndex); | |
| 146 } | |
| 147 break; | |
| 0 | 148 } |
| 149 | |
| 150 len = Bytecodes.lengthFor(bytecode); | |
| 151 if (len <= 0) len = Bytecodes.lengthAt(method, bci); | |
| 152 | |
| 153 if (DEBUG) { | |
| 154 String operand = ""; | |
| 155 switch (len) { | |
| 156 case 2: | |
| 157 operand += code[bci + 1]; | |
| 158 break; | |
| 159 case 3: | |
| 160 operand += (cpoolIndex != 0)? cpoolIndex : | |
| 161 method.getBytecodeShortArg(bci + 1); | |
| 162 break; | |
| 163 case 5: | |
| 164 operand += method.getBytecodeIntArg(bci + 1); | |
| 165 break; | |
| 166 } | |
| 167 | |
| 168 // the operand following # is not quite like javap output. | |
| 169 // in particular, for goto & goto_w, the operand is PC relative | |
| 170 // offset for jump. Javap adds relative offset with current PC | |
| 171 // to give absolute bci to jump to. | |
| 172 | |
| 173 String message = "\t\t" + bci + " " + Bytecodes.name(bytecode); | |
| 174 if (hotspotcode != bytecode) | |
| 175 message += " [" + Bytecodes.name(hotspotcode) + "]"; | |
| 176 if (operand != "") | |
| 177 message += " #" + operand; | |
| 178 | |
| 179 if (DEBUG) debugMessage(message); | |
| 180 } | |
| 181 | |
| 182 bci += len; | |
| 183 } | |
| 184 } | |
| 185 } |