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1 /*
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2 * Copyright 2001-2003 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 package sun.jvm.hotspot.debugger.posix;
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25
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26 import sun.jvm.hotspot.debugger.*;
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27 import sun.jvm.hotspot.debugger.cdbg.*;
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28 import sun.jvm.hotspot.debugger.posix.elf.*;
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29 import sun.jvm.hotspot.utilities.memo.*;
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30
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31 /** Provides a simple wrapper around the ELF library which handles
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32 relocation. */
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33 public abstract class DSO implements LoadObject {
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34
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35 private MemoizedObject file; // contains ELFFile
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36 private String filename;
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37 private Address addr;
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38 private long size;
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39 private IsDSO dso = new IsDSO();
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40
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41 class IsDSO extends MemoizedBoolean {
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42 protected boolean computeValue() {
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43 return getFile().getHeader().getFileType() == ELFHeader.FT_DYN;
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44 }
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45 };
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46
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47 class ELFFileByName extends MemoizedObject {
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48 protected Object computeValue() {
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49 return ELFFileParser.getParser().parse(DSO.this.filename);
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50 }
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51 };
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52
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53 class ELFFileByAddress extends MemoizedObject {
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54 protected Object computeValue() {
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55 return ELFFileParser.getParser().parse(new AddressDataSource(DSO.this.addr));
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56 }
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57 };
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58
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59 public DSO(String filename, long size, Address relocation) throws ELFException {
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60 this.filename = filename;
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61 this.size = size;
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62 this.addr = relocation;
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63 this.file = new ELFFileByName();
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64 }
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65
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66 public DSO(long size, Address relocation) throws ELFException {
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67 this.addr = relocation;
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68 this.size = size;
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69 this.file = new ELFFileByAddress();
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70 }
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71
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72 public String getName() {
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73 return filename;
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74 }
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75
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76 public Address getBase() {
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77 return addr;
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78 }
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79
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80 /** if this .so is unloaded and re-loaded in the same process at a different
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81 base, change the base by calling this to avoid re-parsing the ELF. */
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82 public void setBase(Address newBase) {
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83 addr = newBase;
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84 if (filename == null) {
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85 // ELFFile was created by address. we have to re-parse it.
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86 file = new ELFFileByAddress();
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87 dso = new IsDSO();
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88 }
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89 }
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90
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91 public long getSize() {
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92 return size;
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93 }
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94
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95 public CDebugInfoDataBase getDebugInfoDataBase() throws DebuggerException {
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96 // FIXME: after stabs parser
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97 return null;
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98 }
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99
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100 public BlockSym debugInfoForPC(Address pc) throws DebuggerException {
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101 // FIXME: after stabs parser
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102 return null;
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103 }
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104
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105 public ClosestSymbol closestSymbolToPC(Address pcAsAddr) throws DebuggerException {
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106 boolean dso = isDSO();
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107 long offset = dso? pcAsAddr.minus(addr) : getAddressValue(pcAsAddr);
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108 ELFSymbol sym = getFile().getHeader().getELFSymbol(offset);
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109 return (sym != null)? createClosestSymbol(sym.getName(), offset - sym.getValue()) : null;
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110 }
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111
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112 public LineNumberInfo lineNumberForPC(Address pc) throws DebuggerException {
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113 // FIXME: after stabs parser
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114 return null;
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115 }
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116
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117 /** return true if file is a .so */
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118 public boolean isDSO() {
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119 return dso.getValue();
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120 }
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121
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122 /** Look up a symbol; returns absolute address or null if symbol was
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123 not found. */
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124 public Address lookupSymbol(String symbol) throws ELFException {
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125 ELFSymbol sym = getFile().getHeader().getELFSymbol(symbol);
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126 if (sym == null) {
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127 return null;
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128 }
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129
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130 long value = sym.getValue();
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131 if (isDSO()) {
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132 return addr.addOffsetTo(value);
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133 } else {
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134 return newAddress(value);
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135 }
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136 }
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137
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138 public boolean equals(Object o) {
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139 if (o == null || !(o instanceof DSO)) {
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140 return false;
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141 }
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142 DSO other = (DSO)o;
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143 return getBase().equals(other.getBase());
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144 }
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145
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146 public int hashCode() {
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147 return getBase().hashCode();
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148 }
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149
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150 protected ELFFile getFile() {
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151 return (ELFFile) file.getValue();
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152 }
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153
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154 protected abstract Address newAddress(long addr);
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155 protected abstract long getAddressValue(Address addr);
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156
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157 protected ClosestSymbol createClosestSymbol(String name, long diff) {
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158 return new ClosestSymbol(name, diff);
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159 }
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160 }
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