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0
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1 /*
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2 * Copyright 2000-2006 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 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.memory.*;
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31 import sun.jvm.hotspot.oops.*;
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32 import sun.jvm.hotspot.runtime.*;
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33 import sun.jvm.hotspot.types.*;
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34 import sun.jvm.hotspot.utilities.*;
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35
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36 public class NMethod extends CodeBlob {
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37 private static long pcDescSize;
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38 private static CIntegerField zombieInstructionSizeField;
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39 private static sun.jvm.hotspot.types.OopField methodField;
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40 /** != InvocationEntryBci if this nmethod is an on-stack replacement method */
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41 private static CIntegerField entryBCIField;
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42 /** To support simple linked-list chaining of nmethods */
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43 private static AddressField linkField;
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44 /** Offsets for different nmethod parts */
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45 private static CIntegerField exceptionOffsetField;
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46 private static CIntegerField deoptOffsetField;
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47 private static CIntegerField origPCOffsetField;
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48 private static CIntegerField stubOffsetField;
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49 private static CIntegerField scopesDataOffsetField;
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50 private static CIntegerField scopesPCsOffsetField;
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51 private static CIntegerField dependenciesOffsetField;
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52 private static CIntegerField handlerTableOffsetField;
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53 private static CIntegerField nulChkTableOffsetField;
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54 private static CIntegerField nmethodEndOffsetField;
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55
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56 /** Offsets for entry points */
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57 /** Entry point with class check */
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58 private static AddressField entryPointField;
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59 /** Entry point without class check */
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60 private static AddressField verifiedEntryPointField;
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61 /** Entry point for on stack replacement */
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62 private static AddressField osrEntryPointField;
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63
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64 // FIXME: add access to flags (how?)
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65
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66 /** NMethod Flushing lock (if non-zero, then the nmethod is not removed) */
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67 private static JIntField lockCountField;
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68
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69 /** not_entrant method removal. Each mark_sweep pass will update
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70 this mark to current sweep invocation count if it is seen on the
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71 stack. An not_entrant method can be removed when there is no
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72 more activations, i.e., when the _stack_traversal_mark is less than
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73 current sweep traversal index. */
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74 private static CIntegerField stackTraversalMarkField;
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75
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76 static {
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77 VM.registerVMInitializedObserver(new Observer() {
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78 public void update(Observable o, Object data) {
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79 initialize(VM.getVM().getTypeDataBase());
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80 }
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81 });
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82 }
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83
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84 private static void initialize(TypeDataBase db) {
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85 Type type = db.lookupType("nmethod");
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86
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87 zombieInstructionSizeField = type.getCIntegerField("_zombie_instruction_size");
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88 methodField = type.getOopField("_method");
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89 entryBCIField = type.getCIntegerField("_entry_bci");
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90 linkField = type.getAddressField("_link");
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91 exceptionOffsetField = type.getCIntegerField("_exception_offset");
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92 deoptOffsetField = type.getCIntegerField("_deoptimize_offset");
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93 origPCOffsetField = type.getCIntegerField("_orig_pc_offset");
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94 stubOffsetField = type.getCIntegerField("_stub_offset");
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95 scopesDataOffsetField = type.getCIntegerField("_scopes_data_offset");
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96 scopesPCsOffsetField = type.getCIntegerField("_scopes_pcs_offset");
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97 dependenciesOffsetField = type.getCIntegerField("_dependencies_offset");
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98 handlerTableOffsetField = type.getCIntegerField("_handler_table_offset");
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99 nulChkTableOffsetField = type.getCIntegerField("_nul_chk_table_offset");
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100 nmethodEndOffsetField = type.getCIntegerField("_nmethod_end_offset");
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101 entryPointField = type.getAddressField("_entry_point");
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102 verifiedEntryPointField = type.getAddressField("_verified_entry_point");
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103 osrEntryPointField = type.getAddressField("_osr_entry_point");
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104 lockCountField = type.getJIntField("_lock_count");
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105 stackTraversalMarkField = type.getCIntegerField("_stack_traversal_mark");
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106
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107 pcDescSize = db.lookupType("PcDesc").getSize();
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108 }
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109
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110 public NMethod(Address addr) {
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111 super(addr);
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112 }
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113
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114
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115 // Accessors
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116 public Address getAddress() {
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117 return addr;
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118 }
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119
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120 public Method getMethod() {
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121 return (Method) VM.getVM().getObjectHeap().newOop(methodField.getValue(addr));
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122 }
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123
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124 // Type info
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125 public boolean isNMethod() { return true; }
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126 public boolean isJavaMethod() { return !getMethod().isNative(); }
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127 public boolean isNativeMethod() { return getMethod().isNative(); }
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128 public boolean isOSRMethod() { return getEntryBCI() != VM.getVM().getInvocationEntryBCI(); }
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129
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130 /** Boundaries for different parts */
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131 public Address constantsBegin() { return instructionsBegin(); }
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132 public Address constantsEnd() { return getEntryPoint(); }
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133 public Address codeBegin() { return getEntryPoint(); }
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134 public Address codeEnd() { return headerBegin().addOffsetTo(getStubOffset()); }
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135 public Address exceptionBegin() { return headerBegin().addOffsetTo(getExceptionOffset()); }
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136 public Address deoptBegin() { return headerBegin().addOffsetTo(getDeoptOffset()); }
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137 public Address stubBegin() { return headerBegin().addOffsetTo(getStubOffset()); }
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138 public Address stubEnd() { return headerBegin().addOffsetTo(getScopesDataOffset()); }
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139 public Address scopesDataBegin() { return headerBegin().addOffsetTo(getScopesDataOffset()); }
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140 public Address scopesDataEnd() { return headerBegin().addOffsetTo(getScopesPCsOffset()); }
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141 public Address scopesPCsBegin() { return headerBegin().addOffsetTo(getScopesPCsOffset()); }
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142 public Address scopesPCsEnd() { return headerBegin().addOffsetTo(getDependenciesOffset()); }
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143 public Address dependenciesBegin() { return headerBegin().addOffsetTo(getDependenciesOffset()); }
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144 public Address dependenciesEnd() { return headerBegin().addOffsetTo(getHandlerTableOffset()); }
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145 public Address handlerTableBegin() { return headerBegin().addOffsetTo(getHandlerTableOffset()); }
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146 public Address handlerTableEnd() { return headerBegin().addOffsetTo(getNulChkTableOffset()); }
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147 public Address nulChkTableBegin() { return headerBegin().addOffsetTo(getNulChkTableOffset()); }
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148 public Address nulChkTableEnd() { return headerBegin().addOffsetTo(getNMethodEndOffset()); }
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149
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150 public int constantsSize() { return (int) constantsEnd() .minus(constantsBegin()); }
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151 public int codeSize() { return (int) codeEnd() .minus(codeBegin()); }
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152 public int stubSize() { return (int) stubEnd() .minus(stubBegin()); }
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153 public int scopesDataSize() { return (int) scopesDataEnd() .minus(scopesDataBegin()); }
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154 public int scopesPCsSize() { return (int) scopesPCsEnd() .minus(scopesPCsBegin()); }
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155 public int dependenciesSize() { return (int) dependenciesEnd().minus(dependenciesBegin()); }
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156 public int handlerTableSize() { return (int) handlerTableEnd().minus(handlerTableBegin()); }
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157 public int nulChkTableSize() { return (int) nulChkTableEnd() .minus(nulChkTableBegin()); }
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158 public int origPCOffset() { return (int) origPCOffsetField.getValue(addr); }
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159
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160 public int totalSize() {
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161 return
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162 constantsSize() +
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163 codeSize() +
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164 stubSize() +
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165 scopesDataSize() +
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166 scopesPCsSize() +
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167 dependenciesSize() +
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168 handlerTableSize() +
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169 nulChkTableSize();
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170 }
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171
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172 public boolean constantsContains (Address addr) { return constantsBegin() .lessThanOrEqual(addr) && constantsEnd() .greaterThan(addr); }
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173 public boolean codeContains (Address addr) { return codeBegin() .lessThanOrEqual(addr) && codeEnd() .greaterThan(addr); }
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174 public boolean stubContains (Address addr) { return stubBegin() .lessThanOrEqual(addr) && stubEnd() .greaterThan(addr); }
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175 public boolean scopesDataContains (Address addr) { return scopesDataBegin() .lessThanOrEqual(addr) && scopesDataEnd() .greaterThan(addr); }
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176 public boolean scopesPCsContains (Address addr) { return scopesPCsBegin() .lessThanOrEqual(addr) && scopesPCsEnd() .greaterThan(addr); }
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177 public boolean handlerTableContains(Address addr) { return handlerTableBegin().lessThanOrEqual(addr) && handlerTableEnd().greaterThan(addr); }
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178 public boolean nulChkTableContains (Address addr) { return nulChkTableBegin() .lessThanOrEqual(addr) && nulChkTableEnd() .greaterThan(addr); }
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179
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180 /** Entry points */
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181 public Address getEntryPoint() { return entryPointField.getValue(addr); }
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182 public Address getVerifiedEntryPoint() { return verifiedEntryPointField.getValue(addr); }
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183
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184 // FIXME: add interpreter_entry_point()
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185 // FIXME: add lazy_interpreter_entry_point() for C2
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186
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187 // **********
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188 // * FIXME: * ADD ACCESS TO FLAGS!!!!
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189 // **********
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190 // public boolean isInUse();
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191 // public boolean isAlive();
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192 // public boolean isNotEntrant();
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193 // public boolean isZombie();
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194
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195 // ********************************
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196 // * MAJOR FIXME: MAJOR HACK HERE *
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197 // ********************************
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198 public boolean isZombie() { return false; }
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199
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200 // public boolean isUnloaded();
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201 // public boolean isYoung();
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202 // public boolean isOld();
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203 // public int age();
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204 // public boolean isMarkedForDeoptimization();
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205 // public boolean isMarkedForUnloading();
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206 // public boolean isMarkedForReclamation();
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207 // public int level();
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208 // public int version();
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209
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210 // FIXME: add mutators for above
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211 // FIXME: add exception cache access?
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212
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213 /** On-stack replacement support */
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214 // FIXME: add mutators
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215 public int getOSREntryBCI() {
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216 if (Assert.ASSERTS_ENABLED) {
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217 Assert.that(getEntryBCI() != VM.getVM().getInvocationEntryBCI(), "wrong kind of nmethod");
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218 }
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219 return getEntryBCI();
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220 }
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221
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222 public NMethod getLink() {
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223 return (NMethod) VMObjectFactory.newObject(NMethod.class, linkField.getValue(addr));
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224 }
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225
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226 /** Tells whether frames described by this nmethod can be
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227 deoptimized. Note: native wrappers cannot be deoptimized. */
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228 public boolean canBeDeoptimized() { return isJavaMethod(); }
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229
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230 // FIXME: add inline cache support
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231 // FIXME: add flush()
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232
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233 public boolean isLockedByVM() { return lockCountField.getValue(addr) > 0; }
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234
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235 // FIXME: add mark_as_seen_on_stack
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236 // FIXME: add can_not_entrant_be_converted
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237
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238 // FIXME: add GC support
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239 // void follow_roots_or_mark_for_unloading(bool unloading_occurred, bool& marked_for_unloading);
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240 // void follow_root_or_mark_for_unloading(oop* root, bool unloading_occurred, bool& marked_for_unloading);
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241 // void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, void f(oop*));
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242 // void adjust_pointers();
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243
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244 /** Finds a PCDesc with real-pc equal to "pc" */
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245 public PCDesc getPCDescAt(Address pc) {
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246 // FIXME: consider adding cache like the one down in the VM
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247 for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) {
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248 PCDesc pcDesc = new PCDesc(p);
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249 if (pcDesc.getRealPC(this).equals(pc)) {
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250 return pcDesc;
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251 }
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252 }
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253 return null;
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254 }
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255
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256 /** ScopeDesc for an instruction */
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257 public ScopeDesc getScopeDescAt(Address pc) {
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258 PCDesc pd = getPCDescAt(pc);
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259 if (Assert.ASSERTS_ENABLED) {
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260 Assert.that(pd != null, "scope must be present");
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261 }
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262 return new ScopeDesc(this, pd.getScopeDecodeOffset());
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263 }
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264
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265 /** This is only for use by the debugging system, and is only
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266 intended for use in the topmost frame, where we are not
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267 guaranteed to be at a PC for which we have a PCDesc. It finds
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268 the PCDesc with realPC closest to the current PC. */
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269 public PCDesc getPCDescNearDbg(Address pc) {
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270 PCDesc bestGuessPCDesc = null;
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271 long bestDistance = 0;
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272 for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) {
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273 PCDesc pcDesc = new PCDesc(p);
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274 // In case pc is null
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275 long distance = -pcDesc.getRealPC(this).minus(pc);
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276 if ((bestGuessPCDesc == null) ||
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277 ((distance >= 0) && (distance < bestDistance))) {
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278 bestGuessPCDesc = pcDesc;
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279 bestDistance = distance;
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280 }
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281 }
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282 return bestGuessPCDesc;
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283 }
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284
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285 /** This is only for use by the debugging system, and is only
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286 intended for use in the topmost frame, where we are not
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287 guaranteed to be at a PC for which we have a PCDesc. It finds
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288 the ScopeDesc closest to the current PC. NOTE that this may
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289 return NULL for compiled methods which don't have any
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290 ScopeDescs! */
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291 public ScopeDesc getScopeDescNearDbg(Address pc) {
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292 PCDesc pd = getPCDescNearDbg(pc);
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293 if (pd == null) return null;
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294 return new ScopeDesc(this, pd.getScopeDecodeOffset());
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295 }
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296
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297 public Map/*<Address, PcDesc>*/ getSafepoints() {
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298 Map safepoints = new HashMap(); // Map<Address, PcDesc>
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299 sun.jvm.hotspot.debugger.Address p = null;
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300 for (p = scopesPCsBegin(); p.lessThan(scopesPCsEnd());
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301 p = p.addOffsetTo(pcDescSize)) {
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302 PCDesc pcDesc = new PCDesc(p);
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303 sun.jvm.hotspot.debugger.Address pc = pcDesc.getRealPC(this);
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304 safepoints.put(pc, pcDesc);
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305 }
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306 return safepoints;
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307 }
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308
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309 // FIXME: add getPCOffsetForBCI()
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310 // FIXME: add embeddedOopAt()
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311 // FIXME: add isDependentOn()
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312 // FIXME: add isPatchableAt()
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313
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314 /** Support for code generation. Only here for proof-of-concept. */
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315 public static int getEntryPointOffset() { return (int) entryPointField.getOffset(); }
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316 public static int getVerifiedEntryPointOffset() { return (int) verifiedEntryPointField.getOffset(); }
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317 public static int getOSREntryPointOffset() { return (int) osrEntryPointField.getOffset(); }
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318 public static int getEntryBCIOffset() { return (int) entryBCIField.getOffset(); }
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319 /** NOTE: renamed from "method_offset_in_bytes" */
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320 public static int getMethodOffset() { return (int) methodField.getOffset(); }
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321
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322 public void print() {
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323 printOn(System.out);
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324 }
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325
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326 public String toString() {
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327 Method method = getMethod();
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328 return "NMethod for " +
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329 method.getMethodHolder().getName().asString() + "." +
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330 method.getName().asString() + method.getSignature().asString() + "==>n" +
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331 super.toString();
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332 }
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333
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334 public String flagsToString() {
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335 // FIXME need access to flags...
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336 return "";
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337 }
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338
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339 public String getName() {
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340 Method method = getMethod();
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341 return "NMethod for " +
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342 method.getMethodHolder().getName().asString() + "." +
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343 method.getName().asString() +
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344 method.getSignature().asString();
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345 }
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346
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347 //--------------------------------------------------------------------------------
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348 // Internals only below this point
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349 //
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350
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351 private int getEntryBCI() { return (int) entryBCIField .getValue(addr); }
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352 private int getExceptionOffset() { return (int) exceptionOffsetField .getValue(addr); }
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353 private int getDeoptOffset() { return (int) deoptOffsetField .getValue(addr); }
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354 private int getStubOffset() { return (int) stubOffsetField .getValue(addr); }
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355 private int getScopesDataOffset() { return (int) scopesDataOffsetField .getValue(addr); }
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356 private int getScopesPCsOffset() { return (int) scopesPCsOffsetField .getValue(addr); }
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357 private int getDependenciesOffset() { return (int) dependenciesOffsetField.getValue(addr); }
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358 private int getHandlerTableOffset() { return (int) handlerTableOffsetField.getValue(addr); }
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359 private int getNulChkTableOffset() { return (int) nulChkTableOffsetField .getValue(addr); }
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360 private int getNMethodEndOffset() { return (int) nmethodEndOffsetField .getValue(addr); }
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361 }
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