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1 /*
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2 * Copyright 2000-2005 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.code;
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26
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27 import java.io.*;
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28 import java.util.*;
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29
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30 import sun.jvm.hotspot.oops.*;
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31 import sun.jvm.hotspot.runtime.*;
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32
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33 /** ScopeDescs contain the information that makes source-level
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34 debugging of nmethods possible; each scopeDesc describes a method
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35 activation */
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36
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37 public class ScopeDesc {
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38 /** NMethod information */
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39 private NMethod code;
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40 private Method method;
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41 private int bci;
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42 /** Decoding offsets */
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43 private int decodeOffset;
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44 private int senderDecodeOffset;
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45 private int localsDecodeOffset;
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46 private int expressionsDecodeOffset;
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47 private int monitorsDecodeOffset;
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48
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49 public ScopeDesc(NMethod code, int decodeOffset) {
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50 this.code = code;
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51 this.decodeOffset = decodeOffset;
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52
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53 // Decode header
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54 DebugInfoReadStream stream = streamAt(decodeOffset);
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55
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56 senderDecodeOffset = stream.readInt();
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57 method = (Method) VM.getVM().getObjectHeap().newOop(stream.readOopHandle());
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58 bci = stream.readBCI();
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59 // Decode offsets for body and sender
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60 localsDecodeOffset = stream.readInt();
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61 expressionsDecodeOffset = stream.readInt();
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62 monitorsDecodeOffset = stream.readInt();
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63 }
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64
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65 public NMethod getNMethod() { return code; }
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66 public Method getMethod() { return method; }
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67 public int getBCI() { return bci; }
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68
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69 /** Returns a List<ScopeValue> */
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70 public List getLocals() {
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71 return decodeScopeValues(localsDecodeOffset);
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72 }
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73
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74 /** Returns a List<ScopeValue> */
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75 public List getExpressions() {
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76 return decodeScopeValues(expressionsDecodeOffset);
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77 }
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78
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79 /** Returns a List<MonitorValue> */
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80 public List getMonitors() {
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81 return decodeMonitorValues(monitorsDecodeOffset);
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82 }
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83
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84 /** Stack walking. Returns null if this is the outermost scope. */
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85 public ScopeDesc sender() {
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86 if (isTop()) {
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87 return null;
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88 }
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89
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90 return new ScopeDesc(code, senderDecodeOffset);
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91 }
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92
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93 /** Returns where the scope was decoded */
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94 public int getDecodeOffset() {
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95 return decodeOffset;
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96 }
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97
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98 /** Tells whether sender() returns null */
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99 public boolean isTop() {
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100 return (senderDecodeOffset == DebugInformationRecorder.SERIALIZED_NULL);
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101 }
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102
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103 public boolean equals(Object arg) {
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104 if (arg == null) {
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105 return false;
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106 }
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107
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108 if (!(arg instanceof ScopeDesc)) {
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109 return false;
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110 }
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111
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112 ScopeDesc sd = (ScopeDesc) arg;
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113
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114 return (sd.method.equals(method) && (sd.bci == bci));
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115 }
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116
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117 public void printValue() {
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118 printValueOn(System.out);
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119 }
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120
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121 public void printValueOn(PrintStream tty) {
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122 tty.print("ScopeDesc for ");
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123 method.printValueOn(tty);
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124 tty.println(" @bci " + bci);
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125 }
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126
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127 // FIXME: add more accessors
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128
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129 //--------------------------------------------------------------------------------
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130 // Internals only below this point
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131 //
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132
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133 private DebugInfoReadStream streamAt(int decodeOffset) {
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134 return new DebugInfoReadStream(code, decodeOffset);
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135 }
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136
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137 /** Returns a List<ScopeValue> or null if no values were present */
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138 private List decodeScopeValues(int decodeOffset) {
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139 if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) {
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140 return null;
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141 }
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142 DebugInfoReadStream stream = streamAt(decodeOffset);
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143 int length = stream.readInt();
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144 List res = new ArrayList(length);
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145 for (int i = 0; i < length; i++) {
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146 res.add(ScopeValue.readFrom(stream));
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147 }
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148 return res;
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149 }
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150
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151 /** Returns a List<MonitorValue> or null if no values were present */
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152 private List decodeMonitorValues(int decodeOffset) {
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153 if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) {
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154 return null;
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155 }
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156 DebugInfoReadStream stream = streamAt(decodeOffset);
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157 int length = stream.readInt();
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158 List res = new ArrayList(length);
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159 for (int i = 0; i < length; i++) {
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160 res.add(new MonitorValue(stream));
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161 }
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162 return res;
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163 }
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164 }
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