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1 /*
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2 * Copyright 2001-2006 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 // The following OopClosure types get specialized versions of
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26 // "oop_oop_iterate" that invoke the closures' do_oop methods
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27 // non-virtually, using a mechanism defined in this file. Extend these
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28 // macros in the obvious way to add specializations for new closures.
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29
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30 // Forward declarations.
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31 class OopClosure;
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32 class OopsInGenClosure;
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33 // DefNew
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34 class ScanClosure;
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35 class FastScanClosure;
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36 class FilteringClosure;
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37 // ParNew
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38 class ParScanWithBarrierClosure;
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39 class ParScanWithoutBarrierClosure;
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40 // CMS
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41 class MarkRefsIntoAndScanClosure;
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42 class Par_MarkRefsIntoAndScanClosure;
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43 class PushAndMarkClosure;
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44 class Par_PushAndMarkClosure;
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45 class PushOrMarkClosure;
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46 class Par_PushOrMarkClosure;
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47 class CMSKeepAliveClosure;
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48 class CMSInnerParMarkAndPushClosure;
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49
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50 // This macro applies an argument macro to all OopClosures for which we
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51 // want specialized bodies of "oop_oop_iterate". The arguments to "f" are:
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52 // "f(closureType, non_virtual)"
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53 // where "closureType" is the name of the particular subclass of OopClosure,
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54 // and "non_virtual" will be the string "_nv" if the closure type should
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55 // have its "do_oop" method invoked non-virtually, or else the
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56 // string "_v". ("OopClosure" itself will be the only class in the latter
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57 // category.)
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58
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59 // This is split into several because of a Visual C++ 6.0 compiler bug
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60 // where very long macros cause the compiler to crash
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61
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62 #define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_S(f) \
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63 f(ScanClosure,_nv) \
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64 f(FastScanClosure,_nv) \
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65 f(FilteringClosure,_nv)
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66
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67 #ifndef SERIALGC
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68 #define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_P(f) \
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69 f(ParScanWithBarrierClosure,_nv) \
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70 f(ParScanWithoutBarrierClosure,_nv)
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71 #else // SERIALGC
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72 #define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_P(f)
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73 #endif // SERIALGC
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74
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75 #define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(f) \
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76 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_S(f) \
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77 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_P(f)
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78
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79 #ifndef SERIALGC
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80 #define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_3(f) \
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81 f(MarkRefsIntoAndScanClosure,_nv) \
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82 f(Par_MarkRefsIntoAndScanClosure,_nv) \
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83 f(PushAndMarkClosure,_nv) \
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84 f(Par_PushAndMarkClosure,_nv) \
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85 f(PushOrMarkClosure,_nv) \
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86 f(Par_PushOrMarkClosure,_nv) \
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87 f(CMSKeepAliveClosure,_nv) \
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88 f(CMSInnerParMarkAndPushClosure,_nv)
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89 #else // SERIALGC
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90 #define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_3(f)
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91 #endif // SERIALGC
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92
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93 // We separate these out, because sometime the general one has
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94 // a different definition from the specialized ones, and sometimes it
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95 // doesn't.
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96
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97 #define ALL_OOP_OOP_ITERATE_CLOSURES_1(f) \
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98 f(OopClosure,_v) \
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99 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(f)
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100
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101 #define ALL_OOP_OOP_ITERATE_CLOSURES_3(f) \
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102 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_3(f)
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103
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104 #ifndef SERIALGC
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105 // This macro applies an argument macro to all OopClosures for which we
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106 // want specialized bodies of a family of methods related to
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107 // "par_oop_iterate". The arguments to f are the same as above.
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108 // The "root_class" is the most general class to define; this may be
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109 // "OopClosure" in some applications and "OopsInGenClosure" in others.
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110
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111 #define SPECIALIZED_PAR_OOP_ITERATE_CLOSURES(f) \
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112 f(MarkRefsIntoAndScanClosure,_nv) \
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113 f(PushAndMarkClosure,_nv) \
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114 f(Par_MarkRefsIntoAndScanClosure,_nv) \
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115 f(Par_PushAndMarkClosure,_nv)
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116
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117 #define ALL_PAR_OOP_ITERATE_CLOSURES(f) \
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118 f(OopClosure,_v) \
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119 SPECIALIZED_PAR_OOP_ITERATE_CLOSURES(f)
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120 #endif // SERIALGC
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121
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122 // This macro applies an argument macro to all OopClosures for which we
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123 // want specialized bodies of a family of methods related to
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124 // "oops_since_save_marks_do". The arguments to f are the same as above.
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125 // The "root_class" is the most general class to define; this may be
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126 // "OopClosure" in some applications and "OopsInGenClosure" in others.
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127
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128 #define SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG_S(f) \
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129 f(ScanClosure,_nv) \
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130 f(FastScanClosure,_nv)
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131
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132 #ifndef SERIALGC
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133 #define SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG_P(f) \
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134 f(ParScanWithBarrierClosure,_nv) \
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135 f(ParScanWithoutBarrierClosure,_nv)
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136 #else // SERIALGC
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137 #define SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG_P(f)
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138 #endif // SERIALGC
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139
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140 #define SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG(f) \
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141 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG_S(f) \
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142 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG_P(f)
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143
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144 #define SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(f) \
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145 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG(f)
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146
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147 // We separate these out, because sometime the general one has
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148 // a different definition from the specialized ones, and sometimes it
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149 // doesn't.
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150 // NOTE: One of the valid criticisms of this
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151 // specialize-oop_oop_iterate-for-specific-closures idiom is that it is
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152 // easy to have a silent performance bug: if you fail to de-virtualize,
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153 // things still work, just slower. The "SpecializationStats" mode is
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154 // intended to at least make such a failure easy to detect.
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155 // *Not* using the ALL_SINCE_SAVE_MARKS_CLOSURES(f) macro defined
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156 // below means that *only* closures for which oop_oop_iterate specializations
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157 // exist above may be applied to "oops_since_save_marks". That is,
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158 // this form of the performance bug is caught statically. When you add
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159 // a definition for the general type, this property goes away.
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160 // Make sure you test with SpecializationStats to find such bugs
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161 // when introducing a new closure where you don't want virtual dispatch.
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162
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163 #define ALL_SINCE_SAVE_MARKS_CLOSURES(f) \
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164 f(OopsInGenClosure,_v) \
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165 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(f)
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166
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167 // For keeping stats on effectiveness.
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168 #define ENABLE_SPECIALIZATION_STATS 0
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169
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170
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171 class SpecializationStats {
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172 public:
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173 enum Kind {
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174 ik, // instanceKlass
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175 irk, // instanceRefKlass
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176 oa, // objArrayKlass
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177 NUM_Kinds
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178 };
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179
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180 #if ENABLE_SPECIALIZATION_STATS
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181 private:
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182 static int _numCallsAll;
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183
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184 static int _numCallsTotal[NUM_Kinds];
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185 static int _numCalls_nv[NUM_Kinds];
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186
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187 static int _numDoOopCallsTotal[NUM_Kinds];
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188 static int _numDoOopCalls_nv[NUM_Kinds];
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189 public:
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190 #endif
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191 static void clear() PRODUCT_RETURN;
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192
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193 static inline void record_call() PRODUCT_RETURN;
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194 static inline void record_iterate_call_v(Kind k) PRODUCT_RETURN;
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195 static inline void record_iterate_call_nv(Kind k) PRODUCT_RETURN;
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196 static inline void record_do_oop_call_v(Kind k) PRODUCT_RETURN;
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197 static inline void record_do_oop_call_nv(Kind k) PRODUCT_RETURN;
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198
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199 static void print() PRODUCT_RETURN;
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200 };
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201
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202 #ifndef PRODUCT
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203 #if ENABLE_SPECIALIZATION_STATS
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204
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205 inline void SpecializationStats::record_call() {
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206 _numCallsAll++;;
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207 }
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208 inline void SpecializationStats::record_iterate_call_v(Kind k) {
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209 _numCallsTotal[k]++;
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210 }
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211 inline void SpecializationStats::record_iterate_call_nv(Kind k) {
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212 _numCallsTotal[k]++;
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213 _numCalls_nv[k]++;
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214 }
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215
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216 inline void SpecializationStats::record_do_oop_call_v(Kind k) {
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217 _numDoOopCallsTotal[k]++;
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218 }
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219 inline void SpecializationStats::record_do_oop_call_nv(Kind k) {
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220 _numDoOopCallsTotal[k]++;
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221 _numDoOopCalls_nv[k]++;
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222 }
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223
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224 #else // !ENABLE_SPECIALIZATION_STATS
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225
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226 inline void SpecializationStats::record_call() {}
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227 inline void SpecializationStats::record_iterate_call_v(Kind k) {}
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228 inline void SpecializationStats::record_iterate_call_nv(Kind k) {}
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229 inline void SpecializationStats::record_do_oop_call_v(Kind k) {}
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230 inline void SpecializationStats::record_do_oop_call_nv(Kind k) {}
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231 inline void SpecializationStats::clear() {}
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232 inline void SpecializationStats::print() {}
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233
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234 #endif // ENABLE_SPECIALIZATION_STATS
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235 #endif // !PRODUCT
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