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1 /*
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844
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2 * Copyright 2002-2009 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.tools.jcore;
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26
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27 import sun.jvm.hotspot.oops.*;
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28 import sun.jvm.hotspot.interpreter.*;
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29 import sun.jvm.hotspot.utilities.*;
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30 import sun.jvm.hotspot.debugger.*;
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31 import sun.jvm.hotspot.runtime.*;
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32
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33 public class ByteCodeRewriter
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34 {
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35 private Method method;
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36 private ConstantPool cpool;
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37 private ConstantPoolCache cpCache;
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38 private byte[] code;
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39 private Bytes bytes;
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40
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41 public static final boolean DEBUG = false;
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42 private static final int jintSize = 4;
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43
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44 protected void debugMessage(String message) {
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45 System.out.println(message);
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46 }
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47
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48 public ByteCodeRewriter(Method method, ConstantPool cpool, byte[] code) {
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49 this.method = method;
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50 this.cpool = cpool;
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51 this.cpCache = cpool.getCache();
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52 this.code = code;
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53 this.bytes = VM.getVM().getBytes();
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54
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55 }
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56
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57 protected short getConstantPoolIndex(int bci) {
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58 // get ConstantPool index from ConstantPoolCacheIndex at given bci
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59 short cpCacheIndex = method.getBytecodeShortArg(bci);
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60 if (cpCache == null) {
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61 return cpCacheIndex;
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62 } else {
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63 // change byte-ordering and go via cache
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64 return (short) cpCache.getEntryAt((int) (0xFFFF & bytes.swapShort(cpCacheIndex))).getConstantPoolIndex();
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65 }
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66 }
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67
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68 static private void writeShort(byte[] buf, int index, short value) {
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69 buf[index] = (byte) ((value >> 8) & 0x00FF);
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70 buf[index + 1] = (byte) (value & 0x00FF);
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71 }
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72
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73 public void rewrite() {
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74 int bytecode = Bytecodes._illegal;
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75 int hotspotcode = Bytecodes._illegal;
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76 int len = 0;
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77
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78 for (int bci = 0; bci < code.length;) {
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79 hotspotcode = Bytecodes.codeAt(method, bci);
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80 bytecode = Bytecodes.javaCode(hotspotcode);
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81
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82 if (Assert.ASSERTS_ENABLED) {
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83 int code_from_buffer = 0xFF & code[bci];
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84 Assert.that(code_from_buffer == hotspotcode
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85 || code_from_buffer == Bytecodes._breakpoint,
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86 "Unexpected bytecode found in method bytecode buffer!");
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87 }
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88
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89 // update the code buffer hotspot specific bytecode with the jvm bytecode
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90 code[bci] = (byte) (0xFF & bytecode);
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91
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92 short cpoolIndex = 0;
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93 switch (bytecode) {
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94 // bytecodes with ConstantPoolCache index
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95 case Bytecodes._getstatic:
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96 case Bytecodes._putstatic:
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97 case Bytecodes._getfield:
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98 case Bytecodes._putfield:
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99 case Bytecodes._invokevirtual:
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100 case Bytecodes._invokespecial:
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101 case Bytecodes._invokestatic:
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102 case Bytecodes._invokeinterface: {
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103 cpoolIndex = getConstantPoolIndex(bci + 1);
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104 writeShort(code, bci + 1, cpoolIndex);
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105 break;
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106 }
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107 }
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108
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109 len = Bytecodes.lengthFor(bytecode);
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110 if (len <= 0) len = Bytecodes.lengthAt(method, bci);
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111
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112 if (DEBUG) {
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113 String operand = "";
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114 switch (len) {
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115 case 2:
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116 operand += code[bci + 1];
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117 break;
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118 case 3:
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119 operand += (cpoolIndex != 0)? cpoolIndex :
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120 method.getBytecodeShortArg(bci + 1);
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121 break;
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122 case 5:
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123 operand += method.getBytecodeIntArg(bci + 1);
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124 break;
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125 }
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126
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127 // the operand following # is not quite like javap output.
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128 // in particular, for goto & goto_w, the operand is PC relative
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129 // offset for jump. Javap adds relative offset with current PC
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130 // to give absolute bci to jump to.
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131
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132 String message = "\t\t" + bci + " " + Bytecodes.name(bytecode);
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133 if (hotspotcode != bytecode)
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134 message += " [" + Bytecodes.name(hotspotcode) + "]";
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135 if (operand != "")
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136 message += " #" + operand;
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137
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138 if (DEBUG) debugMessage(message);
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139 }
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140
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141 bci += len;
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142 }
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143 }
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144 }
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