Mercurial > hg > graal-jvmci-8
annotate agent/src/share/classes/sun/jvm/hotspot/tools/jcore/ByteCodeRewriter.java @ 20804:7848fc12602b
Merge with jdk8u40-b25
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Tue, 07 Apr 2015 14:58:49 +0200 |
| parents | 4ca6dc0799b6 64156d22e49d |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2002, 2012, 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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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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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.*; | |
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32 import java.security.AccessController; |
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33 import java.security.PrivilegedAction; |
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34 import java.security.AccessControlContext; |
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35 import java.security.PrivilegedExceptionAction; |
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36 import java.security.PrivilegedActionException; |
| 0 | 37 |
| 38 public class ByteCodeRewriter | |
| 39 { | |
| 40 private Method method; | |
| 41 private ConstantPool cpool; | |
| 42 private ConstantPoolCache cpCache; | |
| 43 private byte[] code; | |
| 44 private Bytes bytes; | |
| 45 | |
| 46 private static final int jintSize = 4; | |
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47 public static final boolean DEBUG; |
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48 |
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49 static { |
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50 String debug = (String) AccessController.doPrivileged( |
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51 new PrivilegedAction() { |
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52 public Object run() { |
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53 return System.getProperty("sun.jvm.hotspot.tools.jcore.ByteCodeRewriter.DEBUG"); |
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54 } |
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55 } |
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56 ); |
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57 DEBUG = (debug != null ? debug.equalsIgnoreCase("true") : false); |
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58 } |
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59 |
| 0 | 60 |
| 61 protected void debugMessage(String message) { | |
| 62 System.out.println(message); | |
| 63 } | |
| 64 | |
| 65 public ByteCodeRewriter(Method method, ConstantPool cpool, byte[] code) { | |
| 66 this.method = method; | |
| 67 this.cpool = cpool; | |
| 68 this.cpCache = cpool.getCache(); | |
| 69 this.code = code; | |
| 70 this.bytes = VM.getVM().getBytes(); | |
| 71 | |
| 72 } | |
| 73 | |
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74 protected short getConstantPoolIndexFromRefMap(int rawcode, int bci) { |
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75 int refIndex; |
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76 String fmt = Bytecodes.format(rawcode); |
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77 switch (fmt.length()) { |
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78 case 2: refIndex = 0xFF & method.getBytecodeByteArg(bci); break; |
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79 case 3: refIndex = 0xFFFF & bytes.swapShort(method.getBytecodeShortArg(bci)); break; |
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80 default: throw new IllegalArgumentException(); |
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81 } |
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82 |
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83 return (short)cpool.objectToCPIndex(refIndex); |
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84 } |
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85 |
| 1602 | 86 protected short getConstantPoolIndex(int rawcode, int bci) { |
| 0 | 87 // get ConstantPool index from ConstantPoolCacheIndex at given bci |
| 1602 | 88 String fmt = Bytecodes.format(rawcode); |
| 89 int cpCacheIndex; | |
| 90 switch (fmt.length()) { | |
| 91 case 2: cpCacheIndex = method.getBytecodeByteArg(bci); break; | |
| 92 case 3: cpCacheIndex = method.getBytecodeShortArg(bci); break; | |
| 93 case 5: | |
| 94 if (fmt.indexOf("__") >= 0) | |
| 95 cpCacheIndex = method.getBytecodeShortArg(bci); | |
| 96 else | |
| 97 cpCacheIndex = method.getBytecodeIntArg(bci); | |
| 98 break; | |
| 99 default: throw new IllegalArgumentException(); | |
| 100 } | |
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101 |
| 0 | 102 if (cpCache == null) { |
| 1602 | 103 return (short) cpCacheIndex; |
| 104 } else if (fmt.indexOf("JJJJ") >= 0) { | |
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105 // Invokedynamic require special handling |
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106 cpCacheIndex = ~cpCacheIndex; |
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107 cpCacheIndex = bytes.swapInt(cpCacheIndex); |
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108 return (short) cpCache.getEntryAt(cpCacheIndex).getConstantPoolIndex(); |
| 1602 | 109 } else if (fmt.indexOf("JJ") >= 0) { |
| 110 // change byte-ordering and go via cache | |
| 111 return (short) cpCache.getEntryAt((int) (0xFFFF & bytes.swapShort((short)cpCacheIndex))).getConstantPoolIndex(); | |
| 112 } else if (fmt.indexOf("j") >= 0) { | |
| 113 // go via cache | |
| 114 return (short) cpCache.getEntryAt((int) (0xFF & cpCacheIndex)).getConstantPoolIndex(); | |
| 0 | 115 } else { |
| 1602 | 116 return (short) cpCacheIndex; |
| 0 | 117 } |
| 118 } | |
| 119 | |
| 120 static private void writeShort(byte[] buf, int index, short value) { | |
| 121 buf[index] = (byte) ((value >> 8) & 0x00FF); | |
| 122 buf[index + 1] = (byte) (value & 0x00FF); | |
| 123 } | |
| 124 | |
| 125 public void rewrite() { | |
| 126 int bytecode = Bytecodes._illegal; | |
| 127 int hotspotcode = Bytecodes._illegal; | |
| 128 int len = 0; | |
| 129 | |
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130 if (DEBUG) { |
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131 String msg = method.getMethodHolder().getName().asString() + "." + |
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132 method.getName().asString() + |
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133 method.getSignature().asString(); |
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134 debugMessage(msg); |
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135 } |
| 0 | 136 for (int bci = 0; bci < code.length;) { |
| 137 hotspotcode = Bytecodes.codeAt(method, bci); | |
| 138 bytecode = Bytecodes.javaCode(hotspotcode); | |
| 139 | |
| 140 if (Assert.ASSERTS_ENABLED) { | |
| 141 int code_from_buffer = 0xFF & code[bci]; | |
| 142 Assert.that(code_from_buffer == hotspotcode | |
| 143 || code_from_buffer == Bytecodes._breakpoint, | |
| 144 "Unexpected bytecode found in method bytecode buffer!"); | |
| 145 } | |
| 146 | |
| 147 // update the code buffer hotspot specific bytecode with the jvm bytecode | |
| 148 code[bci] = (byte) (0xFF & bytecode); | |
| 149 | |
| 150 short cpoolIndex = 0; | |
| 151 switch (bytecode) { | |
| 152 // bytecodes with ConstantPoolCache index | |
| 153 case Bytecodes._getstatic: | |
| 154 case Bytecodes._putstatic: | |
| 155 case Bytecodes._getfield: | |
| 156 case Bytecodes._putfield: | |
| 157 case Bytecodes._invokevirtual: | |
| 158 case Bytecodes._invokespecial: | |
| 159 case Bytecodes._invokestatic: | |
| 160 case Bytecodes._invokeinterface: { | |
| 1602 | 161 cpoolIndex = getConstantPoolIndex(hotspotcode, bci + 1); |
| 0 | 162 writeShort(code, bci + 1, cpoolIndex); |
| 163 break; | |
| 164 } | |
| 1602 | 165 |
| 166 case Bytecodes._invokedynamic: | |
| 167 cpoolIndex = getConstantPoolIndex(hotspotcode, bci + 1); | |
| 168 writeShort(code, bci + 1, cpoolIndex); | |
| 169 writeShort(code, bci + 3, (short)0); // clear out trailing bytes | |
| 170 break; | |
| 171 | |
| 172 case Bytecodes._ldc_w: | |
| 173 if (hotspotcode != bytecode) { | |
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174 // fast_aldc_w puts constant in reference map |
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175 cpoolIndex = getConstantPoolIndexFromRefMap(hotspotcode, bci + 1); |
| 1602 | 176 writeShort(code, bci + 1, cpoolIndex); |
| 177 } | |
| 178 break; | |
| 179 case Bytecodes._ldc: | |
| 180 if (hotspotcode != bytecode) { | |
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181 // fast_aldc puts constant in reference map |
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182 cpoolIndex = getConstantPoolIndexFromRefMap(hotspotcode, bci + 1); |
| 1602 | 183 code[bci + 1] = (byte)(cpoolIndex); |
| 184 } | |
| 185 break; | |
| 0 | 186 } |
| 187 | |
| 188 len = Bytecodes.lengthFor(bytecode); | |
| 189 if (len <= 0) len = Bytecodes.lengthAt(method, bci); | |
| 190 | |
| 191 if (DEBUG) { | |
| 192 String operand = ""; | |
| 193 switch (len) { | |
| 194 case 2: | |
| 195 operand += code[bci + 1]; | |
| 196 break; | |
| 197 case 3: | |
| 198 operand += (cpoolIndex != 0)? cpoolIndex : | |
| 199 method.getBytecodeShortArg(bci + 1); | |
| 200 break; | |
| 201 case 5: | |
| 202 operand += method.getBytecodeIntArg(bci + 1); | |
| 203 break; | |
| 204 } | |
| 205 | |
| 206 // the operand following # is not quite like javap output. | |
| 207 // in particular, for goto & goto_w, the operand is PC relative | |
| 208 // offset for jump. Javap adds relative offset with current PC | |
| 209 // to give absolute bci to jump to. | |
| 210 | |
| 211 String message = "\t\t" + bci + " " + Bytecodes.name(bytecode); | |
| 212 if (hotspotcode != bytecode) | |
| 213 message += " [" + Bytecodes.name(hotspotcode) + "]"; | |
| 214 if (operand != "") | |
| 215 message += " #" + operand; | |
| 216 | |
| 217 if (DEBUG) debugMessage(message); | |
| 218 } | |
| 219 | |
| 220 bci += len; | |
| 221 } | |
| 222 } | |
| 223 } |