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annotate src/share/vm/memory/barrierSet.hpp @ 1245:6484c4ee11cb

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6904516: More object array barrier fixes, following up on 6906727 Summary: Fixed missing pre-barrier calls for G1, modified C1 to call pre- and correct post-barrier interfaces, deleted obsolete interface, (temporarily) disabled redundant deferred barrier in BacktraceBuilder. Reviewed-by: coleenp, jmasa, kvn, never
author ysr
date Mon, 01 Feb 2010 17:29:01 -0800
parents 6aa7255741f3
children c18cbe5936b8
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1 /*
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2 * Copyright 2000-2008 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 // This class provides the interface between a barrier implementation and
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26 // the rest of the system.
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27
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28 class BarrierSet: public CHeapObj {
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29 friend class VMStructs;
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30 public:
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31 enum Name {
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32 ModRef,
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33 CardTableModRef,
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34 CardTableExtension,
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35 G1SATBCT,
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36 G1SATBCTLogging,
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37 Other,
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38 Uninit
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39 };
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40
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41 protected:
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42 int _max_covered_regions;
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43 Name _kind;
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44
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45 public:
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46
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47 BarrierSet() { _kind = Uninit; }
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48 // To get around prohibition on RTTI.
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49 BarrierSet::Name kind() { return _kind; }
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50 virtual bool is_a(BarrierSet::Name bsn) = 0;
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51
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52 // These operations indicate what kind of barriers the BarrierSet has.
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53 virtual bool has_read_ref_barrier() = 0;
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54 virtual bool has_read_prim_barrier() = 0;
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55 virtual bool has_write_ref_barrier() = 0;
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56 virtual bool has_write_ref_pre_barrier() = 0;
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57 virtual bool has_write_prim_barrier() = 0;
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58
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59 // These functions indicate whether a particular access of the given
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60 // kinds requires a barrier.
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61 virtual bool read_ref_needs_barrier(void* field) = 0;
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62 virtual bool read_prim_needs_barrier(HeapWord* field, size_t bytes) = 0;
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63 virtual bool write_ref_needs_barrier(void* field, oop new_val) = 0;
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64 virtual bool write_prim_needs_barrier(HeapWord* field, size_t bytes,
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65 juint val1, juint val2) = 0;
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66
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67 // The first four operations provide a direct implementation of the
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68 // barrier set. An interpreter loop, for example, could call these
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69 // directly, as appropriate.
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70
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71 // Invoke the barrier, if any, necessary when reading the given ref field.
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72 virtual void read_ref_field(void* field) = 0;
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73
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74 // Invoke the barrier, if any, necessary when reading the given primitive
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75 // "field" of "bytes" bytes in "obj".
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76 virtual void read_prim_field(HeapWord* field, size_t bytes) = 0;
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77
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78 // Invoke the barrier, if any, necessary when writing "new_val" into the
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79 // ref field at "offset" in "obj".
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80 // (For efficiency reasons, this operation is specialized for certain
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81 // barrier types. Semantically, it should be thought of as a call to the
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82 // virtual "_work" function below, which must implement the barrier.)
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83 // First the pre-write versions...
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84 template <class T> inline void write_ref_field_pre(T* field, oop new_val);
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85 private:
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86 // Keep this private so as to catch violations at build time.
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87 virtual void write_ref_field_pre_work( void* field, oop new_val) { guarantee(false, "Not needed"); };
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88 protected:
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89 virtual void write_ref_field_pre_work( oop* field, oop new_val) {};
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90 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {};
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91 public:
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92
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93 // ...then the post-write version.
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94 inline void write_ref_field(void* field, oop new_val);
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95 protected:
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96 virtual void write_ref_field_work(void* field, oop new_val) = 0;
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97 public:
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98
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99 // Invoke the barrier, if any, necessary when writing the "bytes"-byte
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100 // value(s) "val1" (and "val2") into the primitive "field".
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101 virtual void write_prim_field(HeapWord* field, size_t bytes,
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102 juint val1, juint val2) = 0;
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103
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104 // Operations on arrays, or general regions (e.g., for "clone") may be
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105 // optimized by some barriers.
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106
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107 // The first six operations tell whether such an optimization exists for
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108 // the particular barrier.
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109 virtual bool has_read_ref_array_opt() = 0;
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110 virtual bool has_read_prim_array_opt() = 0;
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111 virtual bool has_write_ref_array_pre_opt() { return true; }
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112 virtual bool has_write_ref_array_opt() = 0;
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113 virtual bool has_write_prim_array_opt() = 0;
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114
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115 virtual bool has_read_region_opt() = 0;
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116 virtual bool has_write_region_opt() = 0;
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117
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118 // These operations should assert false unless the correponding operation
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119 // above returns true. Otherwise, they should perform an appropriate
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120 // barrier for an array whose elements are all in the given memory region.
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121 virtual void read_ref_array(MemRegion mr) = 0;
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122 virtual void read_prim_array(MemRegion mr) = 0;
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123
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124 // Below length is the # array elements being written
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125 virtual void write_ref_array_pre( oop* dst, int length) {}
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126 virtual void write_ref_array_pre(narrowOop* dst, int length) {}
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127 // Below count is the # array elements being written, starting
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128 // at the address "start", which may not necessarily be HeapWord-aligned
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129 inline void write_ref_array(HeapWord* start, size_t count);
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130
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131 // Static versions, suitable for calling from generated code;
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132 // count is # array elements being written, starting with "start",
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133 // which may not necessarily be HeapWord-aligned.
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134 static void static_write_ref_array_pre(HeapWord* start, size_t count);
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135 static void static_write_ref_array_post(HeapWord* start, size_t count);
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136
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137 protected:
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138 virtual void write_ref_array_work(MemRegion mr) = 0;
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139 public:
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140 virtual void write_prim_array(MemRegion mr) = 0;
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141
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142 virtual void read_region(MemRegion mr) = 0;
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143
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144 // (For efficiency reasons, this operation is specialized for certain
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145 // barrier types. Semantically, it should be thought of as a call to the
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146 // virtual "_work" function below, which must implement the barrier.)
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147 inline void write_region(MemRegion mr);
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148 protected:
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149 virtual void write_region_work(MemRegion mr) = 0;
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150 public:
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151
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152 // Some barrier sets create tables whose elements correspond to parts of
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153 // the heap; the CardTableModRefBS is an example. Such barrier sets will
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154 // normally reserve space for such tables, and commit parts of the table
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155 // "covering" parts of the heap that are committed. The constructor is
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156 // passed the maximum number of independently committable subregions to
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157 // be covered, and the "resize_covoered_region" function allows the
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158 // sub-parts of the heap to inform the barrier set of changes of their
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159 // sizes.
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160 BarrierSet(int max_covered_regions) :
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161 _max_covered_regions(max_covered_regions) {}
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162
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163 // Inform the BarrierSet that the the covered heap region that starts
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164 // with "base" has been changed to have the given size (possibly from 0,
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165 // for initialization.)
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166 virtual void resize_covered_region(MemRegion new_region) = 0;
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167
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168 // If the barrier set imposes any alignment restrictions on boundaries
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169 // within the heap, this function tells whether they are met.
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170 virtual bool is_aligned(HeapWord* addr) = 0;
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171
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172 };