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annotate src/share/vm/oops/oop.hpp @ 344:6aae2f9d0294

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Merge
author ysr
date Thu, 12 Jun 2008 13:50:55 -0700
parents 37f87013dfd8 feeb96a45707
children 1ee8caae33af
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1 /*
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2 * Copyright 1997-2007 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 // oopDesc is the top baseclass for objects classes. The {name}Desc classes describe
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26 // the format of Java objects so the fields can be accessed from C++.
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27 // oopDesc is abstract.
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28 // (see oopHierarchy for complete oop class hierarchy)
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29 //
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30 // no virtual functions allowed
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31
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32 // store into oop with store check
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33 template <class T> void oop_store(T* p, oop v);
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34 template <class T> void oop_store(volatile T* p, oop v);
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35
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36 // store into oop without store check
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37 template <class T> void oop_store_without_check(T* p, oop v);
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38 template <class T> void oop_store_without_check(volatile T* p, oop v);
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39
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40
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41 extern bool always_do_update_barrier;
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42
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43 // Forward declarations.
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44 class OopClosure;
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45 class ScanClosure;
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46 class FastScanClosure;
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47 class FilteringClosure;
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48 class BarrierSet;
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49 class CMSIsAliveClosure;
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50
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51 class PSPromotionManager;
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52 class ParCompactionManager;
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53
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54 class oopDesc {
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55 friend class VMStructs;
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56 private:
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57 volatile markOop _mark;
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58 union _metadata {
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59 wideKlassOop _klass;
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60 narrowOop _compressed_klass;
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61 } _metadata;
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62
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63 // Fast access to barrier set. Must be initialized.
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64 static BarrierSet* _bs;
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65
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66 public:
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67 markOop mark() const { return _mark; }
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68 markOop* mark_addr() const { return (markOop*) &_mark; }
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69
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70 void set_mark(volatile markOop m) { _mark = m; }
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71
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72 void release_set_mark(markOop m);
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73 markOop cas_set_mark(markOop new_mark, markOop old_mark);
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74
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75 // Used only to re-initialize the mark word (e.g., of promoted
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76 // objects during a GC) -- requires a valid klass pointer
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77 void init_mark();
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78
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79 klassOop klass() const;
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80 klassOop klass_or_null() const volatile;
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81 oop* klass_addr();
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82 narrowOop* compressed_klass_addr();
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83
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84 void set_klass(klassOop k);
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85
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86 // For klass field compression
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87 int klass_gap() const;
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88 void set_klass_gap(int z);
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89 // For when the klass pointer is being used as a linked list "next" field.
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90 void set_klass_to_list_ptr(oop k);
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91
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92 // size of object header, aligned to platform wordSize
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93 static int header_size() { return sizeof(oopDesc)/HeapWordSize; }
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94
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95 Klass* blueprint() const;
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96
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97 // Returns whether this is an instance of k or an instance of a subclass of k
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98 bool is_a(klassOop k) const;
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99
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100 // Returns the actual oop size of the object
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101 int size();
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102
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103 // Sometimes (for complicated concurrency-related reasons), it is useful
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104 // to be able to figure out the size of an object knowing its klass.
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105 int size_given_klass(Klass* klass);
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106
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107 // Some perm gen objects are not parseble immediately after
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108 // installation of their klass pointer.
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109 bool is_parsable();
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110
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111 // type test operations (inlined in oop.inline.h)
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112 bool is_instance() const;
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113 bool is_instanceRef() const;
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114 bool is_array() const;
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115 bool is_objArray() const;
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116 bool is_symbol() const;
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117 bool is_klass() const;
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118 bool is_thread() const;
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119 bool is_method() const;
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120 bool is_constMethod() const;
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121 bool is_methodData() const;
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122 bool is_constantPool() const;
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123 bool is_constantPoolCache() const;
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124 bool is_typeArray() const;
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125 bool is_javaArray() const;
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126 bool is_compiledICHolder() const;
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127
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128 private:
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129 // field addresses in oop
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130 void* field_base(int offset) const;
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131
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132 jbyte* byte_field_addr(int offset) const;
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133 jchar* char_field_addr(int offset) const;
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134 jboolean* bool_field_addr(int offset) const;
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135 jint* int_field_addr(int offset) const;
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136 jshort* short_field_addr(int offset) const;
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137 jlong* long_field_addr(int offset) const;
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138 jfloat* float_field_addr(int offset) const;
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139 jdouble* double_field_addr(int offset) const;
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140 address* address_field_addr(int offset) const;
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141
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142 public:
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143 // Need this as public for garbage collection.
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144 template <class T> T* obj_field_addr(int offset) const;
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145
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146 // Oop encoding heap max
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147 static const uint64_t OopEncodingHeapMax =
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148 (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
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149
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150 static bool is_null(oop obj);
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151 static bool is_null(narrowOop obj);
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152
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153 // Decode an oop pointer from a narrowOop if compressed.
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154 // These are overloaded for oop and narrowOop as are the other functions
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155 // below so that they can be called in template functions.
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156 static oop decode_heap_oop_not_null(oop v);
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157 static oop decode_heap_oop_not_null(narrowOop v);
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158 static oop decode_heap_oop(oop v);
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159 static oop decode_heap_oop(narrowOop v);
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160
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161 // Encode an oop pointer to a narrow oop. The or_null versions accept
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162 // null oop pointer, others do not in order to eliminate the
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163 // null checking branches.
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164 static narrowOop encode_heap_oop_not_null(oop v);
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165 static narrowOop encode_heap_oop(oop v);
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166
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167 // Load an oop out of the Java heap
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168 static narrowOop load_heap_oop(narrowOop* p);
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169 static oop load_heap_oop(oop* p);
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171 // Load an oop out of Java heap and decode it to an uncompressed oop.
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172 static oop load_decode_heap_oop_not_null(narrowOop* p);
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173 static oop load_decode_heap_oop_not_null(oop* p);
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174 static oop load_decode_heap_oop(narrowOop* p);
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175 static oop load_decode_heap_oop(oop* p);
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176
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177 // Store an oop into the heap.
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178 static void store_heap_oop(narrowOop* p, narrowOop v);
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179 static void store_heap_oop(oop* p, oop v);
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180
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181 // Encode oop if UseCompressedOops and store into the heap.
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182 static void encode_store_heap_oop_not_null(narrowOop* p, oop v);
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183 static void encode_store_heap_oop_not_null(oop* p, oop v);
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184 static void encode_store_heap_oop(narrowOop* p, oop v);
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185 static void encode_store_heap_oop(oop* p, oop v);
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186
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187 static void release_store_heap_oop(volatile narrowOop* p, narrowOop v);
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188 static void release_store_heap_oop(volatile oop* p, oop v);
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189
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190 static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v);
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191 static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v);
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192 static void release_encode_store_heap_oop(volatile narrowOop* p, oop v);
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193 static void release_encode_store_heap_oop(volatile oop* p, oop v);
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194
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195 static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest);
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196 static oop atomic_compare_exchange_oop(oop exchange_value,
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197 volatile HeapWord *dest,
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198 oop compare_value);
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199
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200 // Access to fields in a instanceOop through these methods.
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201 oop obj_field(int offset) const;
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202 void obj_field_put(int offset, oop value);
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203 void obj_field_raw_put(int offset, oop value);
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204
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205 jbyte byte_field(int offset) const;
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206 void byte_field_put(int offset, jbyte contents);
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207
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208 jchar char_field(int offset) const;
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209 void char_field_put(int offset, jchar contents);
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210
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211 jboolean bool_field(int offset) const;
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212 void bool_field_put(int offset, jboolean contents);
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213
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214 jint int_field(int offset) const;
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215 void int_field_put(int offset, jint contents);
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216
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217 jshort short_field(int offset) const;
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218 void short_field_put(int offset, jshort contents);
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219
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220 jlong long_field(int offset) const;
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221 void long_field_put(int offset, jlong contents);
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222
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223 jfloat float_field(int offset) const;
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224 void float_field_put(int offset, jfloat contents);
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225
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226 jdouble double_field(int offset) const;
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227 void double_field_put(int offset, jdouble contents);
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228
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229 address address_field(int offset) const;
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230 void address_field_put(int offset, address contents);
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231
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232 oop obj_field_acquire(int offset) const;
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233 void release_obj_field_put(int offset, oop value);
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234
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235 jbyte byte_field_acquire(int offset) const;
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236 void release_byte_field_put(int offset, jbyte contents);
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237
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238 jchar char_field_acquire(int offset) const;
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239 void release_char_field_put(int offset, jchar contents);
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240
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241 jboolean bool_field_acquire(int offset) const;
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242 void release_bool_field_put(int offset, jboolean contents);
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243
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244 jint int_field_acquire(int offset) const;
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245 void release_int_field_put(int offset, jint contents);
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246
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247 jshort short_field_acquire(int offset) const;
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248 void release_short_field_put(int offset, jshort contents);
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249
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250 jlong long_field_acquire(int offset) const;
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251 void release_long_field_put(int offset, jlong contents);
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252
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253 jfloat float_field_acquire(int offset) const;
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254 void release_float_field_put(int offset, jfloat contents);
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255
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256 jdouble double_field_acquire(int offset) const;
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257 void release_double_field_put(int offset, jdouble contents);
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258
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259 // printing functions for VM debugging
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260 void print_on(outputStream* st) const; // First level print
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261 void print_value_on(outputStream* st) const; // Second level print.
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262 void print_address_on(outputStream* st) const; // Address printing
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263
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264 // printing on default output stream
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265 void print();
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266 void print_value();
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267 void print_address();
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268
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269 // return the print strings
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270 char* print_string();
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271 char* print_value_string();
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272
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273 // verification operations
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274 void verify_on(outputStream* st);
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275 void verify();
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276 void verify_old_oop(oop* p, bool allow_dirty);
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277 void verify_old_oop(narrowOop* p, bool allow_dirty);
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278
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279 // tells whether this oop is partially constructed (gc during class loading)
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280 bool partially_loaded();
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281 void set_partially_loaded();
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282
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283 // locking operations
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284 bool is_locked() const;
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285 bool is_unlocked() const;
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286 bool has_bias_pattern() const;
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287
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288 // asserts
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289 bool is_oop(bool ignore_mark_word = false) const;
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290 bool is_oop_or_null(bool ignore_mark_word = false) const;
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291 #ifndef PRODUCT
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292 bool is_unlocked_oop() const;
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293 #endif
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294
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295 // garbage collection
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296 bool is_gc_marked() const;
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297 // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL
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298 // reference field in "this".
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299 void follow_contents(void);
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300 void follow_header(void);
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301
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302 #ifndef SERIALGC
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303 // Parallel Scavenge
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304 void copy_contents(PSPromotionManager* pm);
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305 void push_contents(PSPromotionManager* pm);
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306
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307 // Parallel Old
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308 void update_contents(ParCompactionManager* cm);
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309 void update_contents(ParCompactionManager* cm,
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310 HeapWord* begin_limit,
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311 HeapWord* end_limit);
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312 void update_contents(ParCompactionManager* cm,
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313 klassOop old_klass,
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314 HeapWord* begin_limit,
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315 HeapWord* end_limit);
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316
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317 void follow_contents(ParCompactionManager* cm);
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318 void follow_header(ParCompactionManager* cm);
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319 #endif // SERIALGC
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320
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321 bool is_perm() const;
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322 bool is_perm_or_null() const;
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323 bool is_shared() const;
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324 bool is_shared_readonly() const;
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325 bool is_shared_readwrite() const;
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326
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327 // Forward pointer operations for scavenge
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328 bool is_forwarded() const;
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329
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330 void forward_to(oop p);
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331 bool cas_forward_to(oop p, markOop compare);
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332
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333 #ifndef SERIALGC
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334 // Like "forward_to", but inserts the forwarding pointer atomically.
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335 // Exactly one thread succeeds in inserting the forwarding pointer, and
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336 // this call returns "NULL" for that thread; any other thread has the
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337 // value of the forwarding pointer returned and does not modify "this".
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338 oop forward_to_atomic(oop p);
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339 #endif // SERIALGC
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340
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341 oop forwardee() const;
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342
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343 // Age of object during scavenge
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344 int age() const;
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345 void incr_age();
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346
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347 // Adjust all pointers in this object to point at it's forwarded location and
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348 // return the size of this oop. This is used by the MarkSweep collector.
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349 int adjust_pointers();
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350 void adjust_header();
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351
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352 #ifndef SERIALGC
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353 // Parallel old
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354 void update_header();
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355 void update_header(HeapWord* beg_addr, HeapWord* end_addr);
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356 #endif // SERIALGC
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357
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358 // mark-sweep support
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359 void follow_body(int begin, int end);
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360
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361 // Fast access to barrier set
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362 static BarrierSet* bs() { return _bs; }
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363 static void set_bs(BarrierSet* bs) { _bs = bs; }
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364
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365 // iterators, returns size of object
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366 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
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367 int oop_iterate(OopClosureType* blk); \
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368 int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr.
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369
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370 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL)
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371 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL)
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372
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373 #ifndef SERIALGC
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374
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375 #define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
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376 int oop_iterate_backwards(OopClosureType* blk);
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377
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378 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL)
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379 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL)
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380 #endif
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381
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382 void oop_iterate_header(OopClosure* blk);
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383 void oop_iterate_header(OopClosure* blk, MemRegion mr);
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384
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385 // identity hash; returns the identity hash key (computes it if necessary)
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386 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a
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387 // safepoint if called on a biased object. Calling code must be aware of that.
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388 intptr_t identity_hash();
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389 intptr_t slow_identity_hash();
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390
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391 // marks are forwarded to stack when object is locked
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392 bool has_displaced_mark() const;
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393 markOop displaced_mark() const;
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394 void set_displaced_mark(markOop m);
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395
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396 // for code generation
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397 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); }
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398 static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); }
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399 static int klass_gap_offset_in_bytes();
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400 };