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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 // Universe is a name space holding known system classes and objects in the VM. |
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26 // |
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27 // Loaded classes are accessible through the SystemDictionary. |
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28 // |
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29 // The object heap is allocated and accessed through Universe, and various allocation |
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30 // support is provided. Allocation by the interpreter and compiled code is done inline |
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31 // and bails out to Scavenge::invoke_and_allocate. |
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32 |
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33 class CollectedHeap; |
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34 class DeferredObjAllocEvent; |
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35 |
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36 |
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37 // Common parts of a methodOop cache. This cache safely interacts with |
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38 // the RedefineClasses API. |
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39 // |
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40 class CommonMethodOopCache : public CHeapObj { |
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41 // We save the klassOop and the idnum of methodOop in order to get |
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42 // the current cached methodOop. |
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43 private: |
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44 klassOop _klass; |
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45 int _method_idnum; |
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46 |
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47 public: |
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48 CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; } |
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49 ~CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; } |
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50 |
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51 void init(klassOop k, methodOop m, TRAPS); |
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52 klassOop klass() const { return _klass; } |
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53 int method_idnum() const { return _method_idnum; } |
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54 |
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55 // GC support |
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56 void oops_do(OopClosure* f) { f->do_oop((oop*)&_klass); } |
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57 }; |
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58 |
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59 |
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60 // A helper class for caching a methodOop when the user of the cache |
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61 // cares about all versions of the methodOop. |
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62 // |
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63 class ActiveMethodOopsCache : public CommonMethodOopCache { |
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64 // This subclass adds weak references to older versions of the |
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65 // methodOop and a query method for a methodOop. |
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66 |
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67 private: |
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68 // If the cached methodOop has not been redefined, then |
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69 // _prev_methods will be NULL. If all of the previous |
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70 // versions of the method have been collected, then |
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71 // _prev_methods can have a length of zero. |
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72 GrowableArray<jweak>* _prev_methods; |
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73 |
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74 public: |
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75 ActiveMethodOopsCache() { _prev_methods = NULL; } |
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76 ~ActiveMethodOopsCache(); |
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77 |
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78 void add_previous_version(const methodOop method); |
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79 bool is_same_method(const methodOop method) const; |
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80 }; |
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81 |
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82 |
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83 // A helper class for caching a methodOop when the user of the cache |
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84 // only cares about the latest version of the methodOop. |
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85 // |
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86 class LatestMethodOopCache : public CommonMethodOopCache { |
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87 // This subclass adds a getter method for the latest methodOop. |
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88 |
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89 public: |
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90 methodOop get_methodOop(); |
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91 }; |
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92 |
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93 |
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94 class Universe: AllStatic { |
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95 friend class MarkSweep; |
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96 friend class oopDesc; |
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97 friend class ClassLoader; |
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98 friend class Arguments; |
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99 friend class SystemDictionary; |
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100 friend class VMStructs; |
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101 friend class CompactingPermGenGen; |
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102 friend class VM_PopulateDumpSharedSpace; |
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103 |
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104 friend jint universe_init(); |
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105 friend void universe2_init(); |
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106 friend bool universe_post_init(); |
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107 |
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108 private: |
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109 // Known classes in the VM |
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110 static klassOop _boolArrayKlassObj; |
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111 static klassOop _byteArrayKlassObj; |
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112 static klassOop _charArrayKlassObj; |
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113 static klassOop _intArrayKlassObj; |
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114 static klassOop _shortArrayKlassObj; |
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115 static klassOop _longArrayKlassObj; |
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116 static klassOop _singleArrayKlassObj; |
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117 static klassOop _doubleArrayKlassObj; |
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118 static klassOop _typeArrayKlassObjs[T_VOID+1]; |
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119 |
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120 static klassOop _objectArrayKlassObj; |
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121 |
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122 static klassOop _symbolKlassObj; |
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123 static klassOop _methodKlassObj; |
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124 static klassOop _constMethodKlassObj; |
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125 static klassOop _methodDataKlassObj; |
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126 static klassOop _klassKlassObj; |
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127 static klassOop _arrayKlassKlassObj; |
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128 static klassOop _objArrayKlassKlassObj; |
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129 static klassOop _typeArrayKlassKlassObj; |
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130 static klassOop _instanceKlassKlassObj; |
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131 static klassOop _constantPoolKlassObj; |
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132 static klassOop _constantPoolCacheKlassObj; |
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133 static klassOop _compiledICHolderKlassObj; |
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134 static klassOop _systemObjArrayKlassObj; |
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135 |
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136 // Known objects in the VM |
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137 |
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138 // Primitive objects |
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139 static oop _int_mirror; |
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140 static oop _float_mirror; |
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141 static oop _double_mirror; |
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142 static oop _byte_mirror; |
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143 static oop _bool_mirror; |
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144 static oop _char_mirror; |
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145 static oop _long_mirror; |
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146 static oop _short_mirror; |
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147 static oop _void_mirror; |
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148 |
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149 static oop _main_thread_group; // Reference to the main thread group object |
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150 static oop _system_thread_group; // Reference to the system thread group object |
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151 |
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152 static typeArrayOop _the_empty_byte_array; // Canonicalized byte array |
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153 static typeArrayOop _the_empty_short_array; // Canonicalized short array |
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154 static typeArrayOop _the_empty_int_array; // Canonicalized int array |
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155 static objArrayOop _the_empty_system_obj_array; // Canonicalized system obj array |
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156 static objArrayOop _the_empty_class_klass_array; // Canonicalized obj array of type java.lang.Class |
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157 static objArrayOop _the_array_interfaces_array; // Canonicalized 2-array of cloneable & serializable klasses |
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158 static LatestMethodOopCache* _finalizer_register_cache; // static method for registering finalizable objects |
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159 static LatestMethodOopCache* _loader_addClass_cache; // method for registering loaded classes in class loader vector |
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160 static ActiveMethodOopsCache* _reflect_invoke_cache; // method for security checks |
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161 static oop _out_of_memory_error_java_heap; // preallocated error object (no backtrace) |
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162 static oop _out_of_memory_error_perm_gen; // preallocated error object (no backtrace) |
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163 static oop _out_of_memory_error_array_size;// preallocated error object (no backtrace) |
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164 static oop _out_of_memory_error_gc_overhead_limit; // preallocated error object (no backtrace) |
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165 |
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166 // array of preallocated error objects with backtrace |
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167 static objArrayOop _preallocated_out_of_memory_error_array; |
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168 |
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169 // number of preallocated error objects available for use |
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170 static volatile jint _preallocated_out_of_memory_error_avail_count; |
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171 |
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172 static oop _null_ptr_exception_instance; // preallocated exception object |
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173 static oop _arithmetic_exception_instance; // preallocated exception object |
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174 static oop _virtual_machine_error_instance; // preallocated exception object |
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175 // The object used as an exception dummy when exceptions are thrown for |
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176 // the vm thread. |
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177 static oop _vm_exception; |
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178 |
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179 static oop _emptySymbol; // Canonical empty string ("") symbol |
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180 |
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181 // The particular choice of collected heap. |
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182 static CollectedHeap* _collectedHeap; |
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183 |
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184 // array of dummy objects used with +FullGCAlot |
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185 debug_only(static objArrayOop _fullgc_alot_dummy_array;) |
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186 // index of next entry to clear |
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187 debug_only(static int _fullgc_alot_dummy_next;) |
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188 |
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189 // Compiler/dispatch support |
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190 static int _base_vtable_size; // Java vtbl size of klass Object (in words) |
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191 |
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192 // Initialization |
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193 static bool _bootstrapping; // true during genesis |
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194 static bool _fully_initialized; // true after universe_init and initialize_vtables called |
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195 |
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196 // the array of preallocated errors with backtraces |
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197 static objArrayOop preallocated_out_of_memory_errors() { return _preallocated_out_of_memory_error_array; } |
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198 |
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199 // generate an out of memory error; if possible using an error with preallocated backtrace; |
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200 // otherwise return the given default error. |
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201 static oop gen_out_of_memory_error(oop default_err); |
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202 |
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203 // Historic gc information |
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204 static size_t _heap_capacity_at_last_gc; |
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205 static size_t _heap_used_at_last_gc; |
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206 |
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207 static jint initialize_heap(); |
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208 static void initialize_basic_type_mirrors(TRAPS); |
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209 static void fixup_mirrors(TRAPS); |
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210 |
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211 static void reinitialize_vtable_of(KlassHandle h_k, TRAPS); |
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212 static void reinitialize_itables(TRAPS); |
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213 static void compute_base_vtable_size(); // compute vtable size of class Object |
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214 |
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215 static void genesis(TRAPS); // Create the initial world |
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216 |
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217 // Mirrors for primitive classes (created eagerly) |
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218 static oop check_mirror(oop m) { |
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219 assert(m != NULL, "mirror not initialized"); |
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220 return m; |
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221 } |
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222 |
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223 // Debugging |
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224 static int _verify_count; // number of verifies done |
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225 // True during call to verify(). Should only be set/cleared in verify(). |
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226 static bool _verify_in_progress; |
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227 |
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228 static void compute_verify_oop_data(); |
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229 |
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230 public: |
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231 // Known classes in the VM |
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232 static klassOop boolArrayKlassObj() { return _boolArrayKlassObj; } |
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233 static klassOop byteArrayKlassObj() { return _byteArrayKlassObj; } |
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234 static klassOop charArrayKlassObj() { return _charArrayKlassObj; } |
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235 static klassOop intArrayKlassObj() { return _intArrayKlassObj; } |
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236 static klassOop shortArrayKlassObj() { return _shortArrayKlassObj; } |
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237 static klassOop longArrayKlassObj() { return _longArrayKlassObj; } |
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238 static klassOop singleArrayKlassObj() { return _singleArrayKlassObj; } |
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239 static klassOop doubleArrayKlassObj() { return _doubleArrayKlassObj; } |
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240 |
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241 static klassOop objectArrayKlassObj() { |
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242 return _objectArrayKlassObj; |
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243 } |
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244 |
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245 static klassOop typeArrayKlassObj(BasicType t) { |
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246 assert((uint)t < T_VOID+1, "range check"); |
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247 assert(_typeArrayKlassObjs[t] != NULL, "domain check"); |
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248 return _typeArrayKlassObjs[t]; |
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249 } |
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250 |
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251 static klassOop symbolKlassObj() { return _symbolKlassObj; } |
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252 static klassOop methodKlassObj() { return _methodKlassObj; } |
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253 static klassOop constMethodKlassObj() { return _constMethodKlassObj; } |
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254 static klassOop methodDataKlassObj() { return _methodDataKlassObj; } |
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255 static klassOop klassKlassObj() { return _klassKlassObj; } |
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256 static klassOop arrayKlassKlassObj() { return _arrayKlassKlassObj; } |
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257 static klassOop objArrayKlassKlassObj() { return _objArrayKlassKlassObj; } |
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258 static klassOop typeArrayKlassKlassObj() { return _typeArrayKlassKlassObj; } |
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259 static klassOop instanceKlassKlassObj() { return _instanceKlassKlassObj; } |
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260 static klassOop constantPoolKlassObj() { return _constantPoolKlassObj; } |
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261 static klassOop constantPoolCacheKlassObj() { return _constantPoolCacheKlassObj; } |
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262 static klassOop compiledICHolderKlassObj() { return _compiledICHolderKlassObj; } |
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263 static klassOop systemObjArrayKlassObj() { return _systemObjArrayKlassObj; } |
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264 |
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265 // Known objects in tbe VM |
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266 static oop int_mirror() { return check_mirror(_int_mirror); |
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267 } |
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268 static oop float_mirror() { return check_mirror(_float_mirror); } |
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269 static oop double_mirror() { return check_mirror(_double_mirror); } |
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270 static oop byte_mirror() { return check_mirror(_byte_mirror); } |
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271 static oop bool_mirror() { return check_mirror(_bool_mirror); } |
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272 static oop char_mirror() { return check_mirror(_char_mirror); } |
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273 static oop long_mirror() { return check_mirror(_long_mirror); } |
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274 static oop short_mirror() { return check_mirror(_short_mirror); } |
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275 static oop void_mirror() { return check_mirror(_void_mirror); } |
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276 |
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277 // table of same |
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278 static oop _mirrors[T_VOID+1]; |
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279 |
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280 static oop java_mirror(BasicType t) { |
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281 assert((uint)t < T_VOID+1, "range check"); |
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282 return check_mirror(_mirrors[t]); |
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283 } |
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284 static oop main_thread_group() { return _main_thread_group; } |
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285 static void set_main_thread_group(oop group) { _main_thread_group = group;} |
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286 |
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287 static oop system_thread_group() { return _system_thread_group; } |
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288 static void set_system_thread_group(oop group) { _system_thread_group = group;} |
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289 |
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290 static typeArrayOop the_empty_byte_array() { return _the_empty_byte_array; } |
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291 static typeArrayOop the_empty_short_array() { return _the_empty_short_array; } |
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292 static typeArrayOop the_empty_int_array() { return _the_empty_int_array; } |
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293 static objArrayOop the_empty_system_obj_array () { return _the_empty_system_obj_array; } |
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294 static objArrayOop the_empty_class_klass_array () { return _the_empty_class_klass_array; } |
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295 static objArrayOop the_array_interfaces_array() { return _the_array_interfaces_array; } |
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296 static methodOop finalizer_register_method() { return _finalizer_register_cache->get_methodOop(); } |
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297 static methodOop loader_addClass_method() { return _loader_addClass_cache->get_methodOop(); } |
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298 static ActiveMethodOopsCache* reflect_invoke_cache() { return _reflect_invoke_cache; } |
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299 static oop null_ptr_exception_instance() { return _null_ptr_exception_instance; } |
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300 static oop arithmetic_exception_instance() { return _arithmetic_exception_instance; } |
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301 static oop virtual_machine_error_instance() { return _virtual_machine_error_instance; } |
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302 static oop vm_exception() { return _vm_exception; } |
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303 static oop emptySymbol() { return _emptySymbol; } |
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304 |
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305 // OutOfMemoryError support. Returns an error with the required message. The returned error |
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306 // may or may not have a backtrace. If error has a backtrace then the stack trace is already |
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307 // filled in. |
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308 static oop out_of_memory_error_java_heap() { return gen_out_of_memory_error(_out_of_memory_error_java_heap); } |
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309 static oop out_of_memory_error_perm_gen() { return gen_out_of_memory_error(_out_of_memory_error_perm_gen); } |
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310 static oop out_of_memory_error_array_size() { return gen_out_of_memory_error(_out_of_memory_error_array_size); } |
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311 static oop out_of_memory_error_gc_overhead_limit() { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit); } |
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312 |
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313 // Accessors needed for fast allocation |
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314 static klassOop* boolArrayKlassObj_addr() { return &_boolArrayKlassObj; } |
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315 static klassOop* byteArrayKlassObj_addr() { return &_byteArrayKlassObj; } |
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316 static klassOop* charArrayKlassObj_addr() { return &_charArrayKlassObj; } |
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317 static klassOop* intArrayKlassObj_addr() { return &_intArrayKlassObj; } |
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318 static klassOop* shortArrayKlassObj_addr() { return &_shortArrayKlassObj; } |
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319 static klassOop* longArrayKlassObj_addr() { return &_longArrayKlassObj; } |
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320 static klassOop* singleArrayKlassObj_addr() { return &_singleArrayKlassObj; } |
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321 static klassOop* doubleArrayKlassObj_addr() { return &_doubleArrayKlassObj; } |
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322 |
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323 // The particular choice of collected heap. |
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324 static CollectedHeap* heap() { return _collectedHeap; } |
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325 |
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326 // Historic gc information |
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327 static size_t get_heap_capacity_at_last_gc() { return _heap_capacity_at_last_gc; } |
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328 static size_t get_heap_free_at_last_gc() { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; } |
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329 static size_t get_heap_used_at_last_gc() { return _heap_used_at_last_gc; } |
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330 static void update_heap_info_at_gc(); |
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331 |
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332 // Testers |
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333 static bool is_bootstrapping() { return _bootstrapping; } |
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334 static bool is_fully_initialized() { return _fully_initialized; } |
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335 |
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336 static inline bool element_type_should_be_aligned(BasicType type); |
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337 static inline bool field_type_should_be_aligned(BasicType type); |
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338 static bool on_page_boundary(void* addr); |
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339 static bool should_fill_in_stack_trace(Handle throwable); |
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340 static void check_alignment(uintx size, uintx alignment, const char* name); |
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341 |
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342 // Finalizer support. |
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343 static void run_finalizers_on_exit(); |
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344 |
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345 // Iteration |
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346 |
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347 // Apply "f" to the addresses of all the direct heap pointers maintained |
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348 // as static fields of "Universe". |
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349 static void oops_do(OopClosure* f, bool do_all = false); |
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350 |
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351 // Apply "f" to all klasses for basic types (classes not present in |
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352 // SystemDictionary). |
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353 static void basic_type_classes_do(void f(klassOop)); |
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354 |
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355 // Apply "f" to all system klasses (classes not present in SystemDictionary). |
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356 static void system_classes_do(void f(klassOop)); |
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357 |
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358 // For sharing -- fill in a list of known vtable pointers. |
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359 static void init_self_patching_vtbl_list(void** list, int count); |
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360 |
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361 // Debugging |
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362 static bool verify_in_progress() { return _verify_in_progress; } |
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363 static void verify(bool allow_dirty = true, bool silent = false); |
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364 static int verify_count() { return _verify_count; } |
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365 static void print(); |
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366 static void print_on(outputStream* st); |
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367 static void print_heap_at_SIGBREAK(); |
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368 static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); } |
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369 static void print_heap_after_gc() { print_heap_after_gc(gclog_or_tty); } |
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370 static void print_heap_before_gc(outputStream* st); |
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371 static void print_heap_after_gc(outputStream* st); |
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372 |
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373 // Change the number of dummy objects kept reachable by the full gc dummy |
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374 // array; this should trigger relocation in a sliding compaction collector. |
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375 debug_only(static bool release_fullgc_alot_dummy();) |
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376 // The non-oop pattern (see compiledIC.hpp, etc) |
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377 static void* non_oop_word(); |
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378 |
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379 // Oop verification (see MacroAssembler::verify_oop) |
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380 static uintptr_t verify_oop_mask() PRODUCT_RETURN0; |
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381 static uintptr_t verify_oop_bits() PRODUCT_RETURN0; |
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382 static uintptr_t verify_mark_bits() PRODUCT_RETURN0; |
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383 static uintptr_t verify_mark_mask() PRODUCT_RETURN0; |
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384 static uintptr_t verify_klass_mask() PRODUCT_RETURN0; |
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385 static uintptr_t verify_klass_bits() PRODUCT_RETURN0; |
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386 |
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387 // Flushing and deoptimization |
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388 static void flush_dependents_on(instanceKlassHandle dependee); |
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389 #ifdef HOTSWAP |
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390 // Flushing and deoptimization in case of evolution |
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391 static void flush_evol_dependents_on(instanceKlassHandle dependee); |
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392 #endif // HOTSWAP |
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393 // Support for fullspeed debugging |
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394 static void flush_dependents_on_method(methodHandle dependee); |
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395 |
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396 // Compiler support |
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397 static int base_vtable_size() { return _base_vtable_size; } |
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398 }; |
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399 |
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400 class DeferredObjAllocEvent : public CHeapObj { |
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401 private: |
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402 oop _oop; |
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403 size_t _bytesize; |
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404 jint _arena_id; |
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405 |
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406 public: |
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407 DeferredObjAllocEvent(const oop o, const size_t s, const jint id) { |
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408 _oop = o; |
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409 _bytesize = s; |
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410 _arena_id = id; |
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411 } |
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412 |
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413 ~DeferredObjAllocEvent() { |
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414 } |
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415 |
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416 jint arena_id() { return _arena_id; } |
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417 size_t bytesize() { return _bytesize; } |
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418 oop get_oop() { return _oop; } |
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419 }; |