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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 };
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