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annotate src/share/vm/code/oopRecorder.hpp @ 10405:f2110083203d

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8005849: JEP 167: Event-Based JVM Tracing Reviewed-by: acorn, coleenp, sla Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
author sla
date Mon, 10 Jun 2013 11:30:51 +0200
parents da91efe96a93
children 9928ad27a80e
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1 /*
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_CODE_OOPRECORDER_HPP
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26 #define SHARE_VM_CODE_OOPRECORDER_HPP
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27
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28 #include "memory/universe.hpp"
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29 #include "runtime/handles.hpp"
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30 #include "utilities/growableArray.hpp"
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31
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32 // Recording and retrieval of either oop relocations or metadata in compiled code.
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33
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34 class CodeBlob;
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35
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36 template <class T> class ValueRecorder : public StackObj {
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37 public:
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38 // A two-way mapping from positive indexes to oop handles.
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39 // The zero index is reserved for a constant (sharable) null.
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40 // Indexes may not be negative.
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41
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42 // Use the given arena to manage storage, if not NULL.
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43 // By default, uses the current ResourceArea.
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44 ValueRecorder(Arena* arena = NULL);
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45
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46 // Generate a new index on which nmethod::oop_addr_at will work.
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47 // allocate_index and find_index never return the same index,
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48 // and allocate_index never returns the same index twice.
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49 // In fact, two successive calls to allocate_index return successive ints.
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50 int allocate_index(T h) {
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51 return add_handle(h, false);
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52 }
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53
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54 // For a given jobject or Metadata*, this will return the same index
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55 // repeatedly. The index can later be given to nmethod::oop_at or
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56 // metadata_at to retrieve the oop.
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57 // However, the oop must not be changed via nmethod::oop_addr_at.
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58 int find_index(T h) {
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59 int index = maybe_find_index(h);
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60 if (index < 0) { // previously unallocated
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61 index = add_handle(h, true);
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62 }
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63 return index;
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64 }
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65
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66 // returns the size of the generated oop/metadata table, for sizing the
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67 // CodeBlob. Must be called after all oops are allocated!
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68 int size();
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69
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70 // Retrieve the value at a given index.
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71 T at(int index);
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72
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73 int count() {
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74 if (_handles == NULL) return 0;
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75 // there is always a NULL virtually present as first object
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76 return _handles->length() + first_index;
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77 }
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78
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79 // Helper function; returns false for NULL or Universe::non_oop_word().
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80 bool is_real(T h) {
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81 return h != NULL && h != (T)Universe::non_oop_word();
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82 }
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83
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84 // copy the generated table to nmethod
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85 void copy_values_to(nmethod* nm);
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86
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87 bool is_unused() { return _handles == NULL && !_complete; }
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88 #ifdef ASSERT
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89 bool is_complete() { return _complete; }
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90 #endif
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91
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92 private:
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93 // variant of find_index which does not allocate if not found (yields -1)
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94 int maybe_find_index(T h);
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95
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96 // leaky hash table of handle => index, to help detect duplicate insertion
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97 template <class X> class IndexCache : public ResourceObj {
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98 // This class is only used by the ValueRecorder class.
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99 friend class ValueRecorder;
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100 enum {
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101 _log_cache_size = 9,
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102 _cache_size = (1<<_log_cache_size),
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103 // Index entries are ints. The LSBit is a collision indicator.
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104 _collision_bit_shift = 0,
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105 _collision_bit = 1,
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106 _index_shift = _collision_bit_shift+1
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107 };
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108 int _cache[_cache_size];
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109 static juint cache_index(X handle) {
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110 juint ci = (int) (intptr_t) handle;
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111 ci ^= ci >> (BitsPerByte*2);
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112 ci += ci >> (BitsPerByte*1);
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113 return ci & (_cache_size-1);
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114 }
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115 int* cache_location(X handle) {
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116 return &_cache[ cache_index(handle) ];
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117 }
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118 static bool cache_location_collision(int* cloc) {
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119 return ((*cloc) & _collision_bit) != 0;
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120 }
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121 static int cache_location_index(int* cloc) {
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122 return (*cloc) >> _index_shift;
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123 }
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124 static void set_cache_location_index(int* cloc, int index) {
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125 int cval0 = (*cloc);
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126 int cval1 = (index << _index_shift);
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127 if (cval0 != 0 && cval1 != cval0) cval1 += _collision_bit;
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128 (*cloc) = cval1;
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129 }
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130 IndexCache();
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131 };
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132
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133 void maybe_initialize();
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134 int add_handle(T h, bool make_findable);
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135
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136 enum { null_index = 0, first_index = 1, index_cache_threshold = 20 };
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137
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138 GrowableArray<T>* _handles; // ordered list (first is always NULL)
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139 GrowableArray<int>* _no_finds; // all unfindable indexes; usually empty
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140 IndexCache<T>* _indexes; // map: handle -> its probable index
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141 Arena* _arena;
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142 bool _complete;
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143
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144 #ifdef ASSERT
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145 static int _find_index_calls, _hit_indexes, _missed_indexes;
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146 #endif
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147 };
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148
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149 class OopRecorder : public ResourceObj {
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150 private:
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151 ValueRecorder<jobject> _oops;
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152 ValueRecorder<Metadata*> _metadata;
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153 public:
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154 OopRecorder(Arena* arena = NULL): _oops(arena), _metadata(arena) {}
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155
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156 int allocate_oop_index(jobject h) {
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157 return _oops.allocate_index(h);
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158 }
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159 int find_index(jobject h) {
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160 return _oops.find_index(h);
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161 }
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162 jobject oop_at(int index) {
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163 return _oops.at(index);
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164 }
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165 int oop_size() {
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166 return _oops.size();
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167 }
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168 int oop_count() {
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169 return _oops.count();
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170 }
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171 bool is_real(jobject h) {
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172 return _oops.is_real(h);
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173 }
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174
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175 int allocate_metadata_index(Metadata* oop) {
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176 return _metadata.allocate_index(oop);
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177 }
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178 int find_index(Metadata* h) {
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179 return _metadata.find_index(h);
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180 }
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181 Metadata* metadata_at(int index) {
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182 return _metadata.at(index);
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183 }
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184 int metadata_size() {
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185 return _metadata.size();
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186 }
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187 int metadata_count() {
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188 return _metadata.count();
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189 }
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190 bool is_real(Metadata* h) {
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191 return _metadata.is_real(h);
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192 }
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193
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194 bool is_unused() {
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195 return _oops.is_unused() && _metadata.is_unused();
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196 }
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197
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198 void freeze() {
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199 _oops.size();
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200 _metadata.size();
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201 }
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202
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203 void copy_values_to(nmethod* nm) {
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204 if (!_oops.is_unused()) {
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205 _oops.copy_values_to(nm);
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206 }
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207 if (!_metadata.is_unused()) {
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208 _metadata.copy_values_to(nm);
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209 }
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210 }
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211
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212 #ifdef ASSERT
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213 bool is_complete() {
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214 assert(_oops.is_complete() == _metadata.is_complete(), "must agree");
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215 return _oops.is_complete();
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216 }
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217 #endif
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218 };
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219
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220
1972
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221 #endif // SHARE_VM_CODE_OOPRECORDER_HPP