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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.compiler;
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26
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27 import java.util.*;
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28
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29 import sun.jvm.hotspot.code.*;
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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 import sun.jvm.hotspot.types.*;
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33 import sun.jvm.hotspot.utilities.*;
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34
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35 public class OopMapSet extends VMObject {
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36 private static final boolean DEBUG = System.getProperty("sun.jvm.hotspot.compiler.OopMapSet.DEBUG") != null;
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37
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38 private static CIntegerField omCountField;
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39 private static CIntegerField omSizeField;
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40 private static AddressField omDataField;
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41 private static int REG_COUNT;
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42 private static int SAVED_ON_ENTRY_REG_COUNT;
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43 private static int C_SAVED_ON_ENTRY_REG_COUNT;
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44 private static class MyVisitor implements OopMapVisitor {
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45 private AddressVisitor addressVisitor;
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46
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47 public MyVisitor(AddressVisitor oopVisitor) {
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48 setAddressVisitor(oopVisitor);
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49 }
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50
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51 public void setAddressVisitor(AddressVisitor addressVisitor) {
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52 this.addressVisitor = addressVisitor;
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53 }
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54
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55 public void visitOopLocation(Address oopAddr) {
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56 addressVisitor.visitAddress(oopAddr);
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57 }
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58
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59 public void visitDerivedOopLocation(Address baseOopAddr, Address derivedOopAddr) {
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60 if (VM.getVM().isClientCompiler()) {
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61 Assert.that(false, "should not reach here");
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62 } else if (VM.getVM().isServerCompiler() &&
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63 VM.getVM().useDerivedPointerTable()) {
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64 Assert.that(false, "FIXME: add derived pointer table");
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65 }
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66 }
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67
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68 public void visitValueLocation(Address valueAddr) {
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69 }
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70
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71 public void visitDeadLocation(Address deadAddr) {
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72 }
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73 }
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74
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75 static {
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76 VM.registerVMInitializedObserver(new Observer() {
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77 public void update(Observable o, Object data) {
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78 initialize(VM.getVM().getTypeDataBase());
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79 }
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80 });
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81 }
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82
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83 private static void initialize(TypeDataBase db) {
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84 Type type = db.lookupType("OopMapSet");
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85
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86 omCountField = type.getCIntegerField("_om_count");
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87 omSizeField = type.getCIntegerField("_om_size");
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88 omDataField = type.getAddressField("_om_data");
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89
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90 if (!VM.getVM().isCore()) {
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91 REG_COUNT = db.lookupIntConstant("REG_COUNT").intValue();
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92 if (VM.getVM().isServerCompiler()) {
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93 SAVED_ON_ENTRY_REG_COUNT = (int) db.lookupIntConstant("SAVED_ON_ENTRY_REG_COUNT").intValue();
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94 C_SAVED_ON_ENTRY_REG_COUNT = (int) db.lookupIntConstant("C_SAVED_ON_ENTRY_REG_COUNT").intValue();
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95 }
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96 }
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97 }
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98
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99 public OopMapSet(Address addr) {
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100 super(addr);
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101 }
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102
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103 /** Returns the number of OopMaps in this OopMapSet */
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104 public long getSize() {
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105 return omCountField.getValue(addr);
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106 }
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107
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108 /** returns the OopMap at a given index */
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109 public OopMap getMapAt(int index) {
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110 if (Assert.ASSERTS_ENABLED) {
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111 Assert.that((index >= 0) && (index <= getSize()),"bad index");
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112 }
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113 Address omDataAddr = omDataField.getValue(addr);
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114 Address oopMapAddr = omDataAddr.getAddressAt(index * VM.getVM().getAddressSize());
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115 if (oopMapAddr == null) {
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116 return null;
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117 }
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118 return new OopMap(oopMapAddr);
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119 }
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120
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121 public OopMap findMapAtOffset(long pcOffset, boolean debugging) {
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122 int i;
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123 int len = (int) getSize();
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124 if (Assert.ASSERTS_ENABLED) {
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125 Assert.that(len > 0, "must have pointer maps");
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126 }
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127
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128 // Scan through oopmaps. Stop when current offset is either equal or greater
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129 // than the one we are looking for.
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130 for (i = 0; i < len; i++) {
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131 if (getMapAt(i).getOffset() >= pcOffset) {
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132 break;
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133 }
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134 }
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135
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136 if (!debugging) {
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137 if (Assert.ASSERTS_ENABLED) {
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138 Assert.that(i < len, "oopmap not found for pcOffset = " + pcOffset + "; len = " + len);
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139 Assert.that(getMapAt(i).getOffset() == pcOffset, "oopmap not found");
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140 }
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141 } else {
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142 if (i == len) {
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143 if (DEBUG) {
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144 System.out.println("can't find oopmap at " + pcOffset);
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145 System.out.print("Oopmap offsets are [ ");
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146 for (i = 0; i < len; i++) {
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147 System.out.print(getMapAt(i).getOffset());
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148 }
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149 System.out.println("]");
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150 }
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151 i = len - 1;
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152 return getMapAt(i);
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153 }
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154 }
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155
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156 OopMap m = getMapAt(i);
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157 return m;
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158 }
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159
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160 /** Visitation -- iterates through the frame for a compiled method.
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161 This is a very generic mechanism that requires the Address to be
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162 dereferenced by the callee. Other, more specialized, visitation
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163 mechanisms are given below. */
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164 public static void oopsDo(Frame fr, CodeBlob cb, RegisterMap regMap, AddressVisitor oopVisitor, boolean debugging) {
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165 allDo(fr, cb, regMap, new MyVisitor(oopVisitor), debugging);
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166 }
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167
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168 /** Note that there are 4 required AddressVisitors: one for oops,
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169 one for derived oops, one for values, and one for dead values */
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170 public static void allDo(Frame fr, CodeBlob cb, RegisterMap regMap, OopMapVisitor visitor, boolean debugging) {
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171 if (Assert.ASSERTS_ENABLED) {
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172 CodeBlob tmpCB = VM.getVM().getCodeCache().findBlob(fr.getPC());
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173 Assert.that(tmpCB != null && cb.equals(tmpCB), "wrong codeblob passed in");
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174 }
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175
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176 OopMapSet maps = cb.getOopMaps();
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177 OopMap map = cb.getOopMapForReturnAddress(fr.getPC(), debugging);
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178 if (Assert.ASSERTS_ENABLED) {
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179 Assert.that(map != null, "no ptr map found");
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180 }
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181
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182 // handle derived pointers first (otherwise base pointer may be
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183 // changed before derived pointer offset has been collected)
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184 OopMapValue omv;
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185 {
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186 for (OopMapStream oms = new OopMapStream(map, OopMapValue.OopTypes.DERIVED_OOP_VALUE); !oms.isDone(); oms.next()) {
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187 if (VM.getVM().isClientCompiler()) {
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188 Assert.that(false, "should not reach here");
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189 }
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190 omv = oms.getCurrent();
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191 Address loc = fr.oopMapRegToLocation(omv.getReg(), regMap);
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192 if (loc != null) {
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193 Address baseLoc = fr.oopMapRegToLocation(omv.getContentReg(), regMap);
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194 Address derivedLoc = loc;
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195 visitor.visitDerivedOopLocation(baseLoc, derivedLoc);
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196 }
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197 }
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198 }
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199
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200 // We want dead, value and oop oop_types
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201 OopMapValue.OopTypes[] values = new OopMapValue.OopTypes[] {
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202 OopMapValue.OopTypes.OOP_VALUE, OopMapValue.OopTypes.VALUE_VALUE, OopMapValue.OopTypes.DEAD_VALUE
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203 };
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204
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205 {
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206 for (OopMapStream oms = new OopMapStream(map, values); !oms.isDone(); oms.next()) {
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207 omv = oms.getCurrent();
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208 Address loc = fr.oopMapRegToLocation(omv.getReg(), regMap);
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209 if (loc != null) {
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210 if (omv.getType() == OopMapValue.OopTypes.OOP_VALUE) {
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211 // This assert commented out because this will be useful
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212 // to detect in the debugging system
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213 // assert(Universe::is_heap_or_null(*loc), "found non oop pointer");
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214 visitor.visitOopLocation(loc);
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215 } else if (omv.getType() == OopMapValue.OopTypes.VALUE_VALUE) {
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216 visitor.visitValueLocation(loc);
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217 } else if (omv.getType() == OopMapValue.OopTypes.DEAD_VALUE) {
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218 visitor.visitDeadLocation(loc);
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219 }
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220 }
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221 }
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222 }
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223 }
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224
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225 /** Update callee-saved register info for the following frame.
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226 Should only be called in non-core builds. */
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227 public static void updateRegisterMap(Frame fr, CodeBlob cb, RegisterMap regMap, boolean debugging) {
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228 if (Assert.ASSERTS_ENABLED) {
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229 Assert.that(!VM.getVM().isCore(), "non-core builds only");
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230 }
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231
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232 if (!VM.getVM().isDebugging()) {
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233 if (Assert.ASSERTS_ENABLED) {
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234 OopMapSet maps = cb.getOopMaps();
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235 Assert.that((maps != null) && (maps.getSize() > 0), "found null or empty OopMapSet for CodeBlob");
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236 }
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237 } else {
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238 // Hack for some topmost frames that have been found with empty
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239 // OopMapSets. (Actually have not seen the null case, but don't
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240 // want to take any chances.) See HSDB.showThreadStackMemory().
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241 OopMapSet maps = cb.getOopMaps();
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242 if ((maps == null) || (maps.getSize() == 0)) {
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243 return;
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244 }
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245 }
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246
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247 // Check if caller must update oop argument
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248 regMap.setIncludeArgumentOops(cb.callerMustGCArguments(regMap.getThread()));
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249
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250 int nofCallee = 0;
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251 Address[] locs = new Address[2 * REG_COUNT + 1];
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252 VMReg [] regs = new VMReg [2 * REG_COUNT + 1];
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253 // ("+1" because REG_COUNT might be zero)
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254
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255 // Scan through oopmap and find location of all callee-saved registers
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256 // (we do not do update in place, since info could be overwritten)
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257 OopMap map = cb.getOopMapForReturnAddress(fr.getPC(), debugging);
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258 if (Assert.ASSERTS_ENABLED) {
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259 Assert.that(map != null, "no ptr map found");
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260 }
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261
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262 OopMapValue omv = null;
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263 for(OopMapStream oms = new OopMapStream(map, OopMapValue.OopTypes.CALLEE_SAVED_VALUE); !oms.isDone(); oms.next()) {
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264 omv = oms.getCurrent();
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265 if (Assert.ASSERTS_ENABLED) {
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266 Assert.that(nofCallee < 2 * REG_COUNT, "overflow");
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267 }
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268 regs[nofCallee] = omv.getContentReg();
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269 locs[nofCallee] = fr.oopMapRegToLocation(omv.getReg(), regMap);
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270 nofCallee++;
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271 }
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272
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273 // Check that runtime stubs save all callee-saved registers
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274 // After adapter frames were deleted C2 doesn't use callee save registers at present
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275 if (Assert.ASSERTS_ENABLED) {
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276 if (VM.getVM().isServerCompiler()) {
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277 Assert.that(!cb.isRuntimeStub() ||
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278 (nofCallee >= SAVED_ON_ENTRY_REG_COUNT || nofCallee >= C_SAVED_ON_ENTRY_REG_COUNT),
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279 "must save all");
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280 }
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281 }
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282
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283 // Copy found callee-saved register to reg_map
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284 for (int i = 0; i < nofCallee; i++) {
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285 regMap.setLocation(regs[i], locs[i]);
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286 }
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287 }
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288 }
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