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annotate src/share/vm/memory/universe.hpp @ 14517:3812c088b945
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_UNIVERSE_HPP |
26 #define SHARE_VM_MEMORY_UNIVERSE_HPP | |
27 | |
28 #include "runtime/handles.hpp" | |
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29 #include "utilities/array.hpp" |
1972 | 30 #include "utilities/growableArray.hpp" |
31 | |
0 | 32 // Universe is a name space holding known system classes and objects in the VM. |
33 // | |
34 // Loaded classes are accessible through the SystemDictionary. | |
35 // | |
36 // The object heap is allocated and accessed through Universe, and various allocation | |
37 // support is provided. Allocation by the interpreter and compiled code is done inline | |
38 // and bails out to Scavenge::invoke_and_allocate. | |
39 | |
40 class CollectedHeap; | |
41 class DeferredObjAllocEvent; | |
42 | |
43 | |
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44 // A helper class for caching a Method* when the user of the cache |
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45 // only cares about the latest version of the Method*. This cache safely |
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46 // interacts with the RedefineClasses API. |
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47 |
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48 class LatestMethodCache : public CHeapObj<mtClass> { |
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49 // We save the Klass* and the idnum of Method* in order to get |
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50 // the current cached Method*. |
0 | 51 private: |
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52 Klass* _klass; |
0 | 53 int _method_idnum; |
54 | |
55 public: | |
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56 LatestMethodCache() { _klass = NULL; _method_idnum = -1; } |
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57 ~LatestMethodCache() { _klass = NULL; _method_idnum = -1; } |
0 | 58 |
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59 void init(Klass* k, Method* m); |
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60 Klass* klass() const { return _klass; } |
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61 int method_idnum() const { return _method_idnum; } |
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62 |
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63 Method* get_method(); |
0 | 64 |
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65 // Enhanced Class Redefinition support |
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66 void classes_do(void f(Klass*)) { |
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67 f(_klass); |
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68 } |
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69 |
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70 // CDS support. Replace the klass in this with the archive version |
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71 // could use this for Enhanced Class Redefinition also. |
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72 void serialize(SerializeClosure* f) { |
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73 f->do_ptr((void**)&_klass); |
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74 } |
0 | 75 }; |
76 | |
77 | |
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78 // For UseCompressedOops. |
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79 struct NarrowPtrStruct { |
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80 // Base address for oop-within-java-object materialization. |
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81 // NULL if using wide oops or zero based narrow oops. |
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82 address _base; |
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83 // Number of shift bits for encoding/decoding narrow ptrs. |
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84 // 0 if using wide ptrs or zero based unscaled narrow ptrs, |
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85 // LogMinObjAlignmentInBytes/LogKlassAlignmentInBytes otherwise. |
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86 int _shift; |
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87 // Generate code with implicit null checks for narrow ptrs. |
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88 bool _use_implicit_null_checks; |
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89 }; |
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90 |
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91 enum VerifyOption { |
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92 VerifyOption_Default = 0, |
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93 |
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94 // G1 |
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95 VerifyOption_G1UsePrevMarking = VerifyOption_Default, |
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96 VerifyOption_G1UseNextMarking = VerifyOption_G1UsePrevMarking + 1, |
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97 VerifyOption_G1UseMarkWord = VerifyOption_G1UseNextMarking + 1 |
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98 }; |
0 | 99 |
100 class Universe: AllStatic { | |
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101 // Ugh. Universe is much too friendly. |
0 | 102 friend class MarkSweep; |
103 friend class oopDesc; | |
104 friend class ClassLoader; | |
105 friend class Arguments; | |
106 friend class SystemDictionary; | |
107 friend class VMStructs; | |
108 friend class VM_PopulateDumpSharedSpace; | |
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109 friend class Metaspace; |
0 | 110 |
111 friend jint universe_init(); | |
112 friend void universe2_init(); | |
113 friend bool universe_post_init(); | |
114 | |
115 private: | |
116 // Known classes in the VM | |
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117 static Klass* _boolArrayKlassObj; |
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118 static Klass* _byteArrayKlassObj; |
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119 static Klass* _charArrayKlassObj; |
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120 static Klass* _intArrayKlassObj; |
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121 static Klass* _shortArrayKlassObj; |
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122 static Klass* _longArrayKlassObj; |
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123 static Klass* _singleArrayKlassObj; |
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124 static Klass* _doubleArrayKlassObj; |
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125 static Klass* _typeArrayKlassObjs[T_VOID+1]; |
0 | 126 |
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127 static Klass* _objectArrayKlassObj; |
0 | 128 |
129 // Known objects in the VM | |
130 | |
131 // Primitive objects | |
132 static oop _int_mirror; | |
133 static oop _float_mirror; | |
134 static oop _double_mirror; | |
135 static oop _byte_mirror; | |
136 static oop _bool_mirror; | |
137 static oop _char_mirror; | |
138 static oop _long_mirror; | |
139 static oop _short_mirror; | |
140 static oop _void_mirror; | |
141 | |
142 static oop _main_thread_group; // Reference to the main thread group object | |
143 static oop _system_thread_group; // Reference to the system thread group object | |
144 | |
145 static objArrayOop _the_empty_class_klass_array; // Canonicalized obj array of type java.lang.Class | |
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146 static oop _the_null_string; // A cache of "null" as a Java string |
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147 static oop _the_min_jint_string; // A cache of "-2147483648" as a Java string |
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148 static LatestMethodCache* _finalizer_register_cache; // static method for registering finalizable objects |
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149 static LatestMethodCache* _loader_addClass_cache; // method for registering loaded classes in class loader vector |
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150 static LatestMethodCache* _pd_implies_cache; // method for checking protection domain attributes |
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151 |
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152 static Method* _throw_illegal_access_error; |
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153 |
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154 // preallocated error objects (no backtrace) |
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155 static oop _out_of_memory_error_java_heap; |
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156 static oop _out_of_memory_error_metaspace; |
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157 static oop _out_of_memory_error_class_metaspace; |
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158 static oop _out_of_memory_error_array_size; |
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159 static oop _out_of_memory_error_gc_overhead_limit; |
0 | 160 |
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161 static Array<int>* _the_empty_int_array; // Canonicalized int array |
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162 static Array<u2>* _the_empty_short_array; // Canonicalized short array |
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163 static Array<Klass*>* _the_empty_klass_array; // Canonicalized klass obj array |
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164 static Array<Method*>* _the_empty_method_array; // Canonicalized method obj array |
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165 |
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166 static Array<Klass*>* _the_array_interfaces_array; |
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167 |
0 | 168 // array of preallocated error objects with backtrace |
169 static objArrayOop _preallocated_out_of_memory_error_array; | |
170 | |
171 // number of preallocated error objects available for use | |
172 static volatile jint _preallocated_out_of_memory_error_avail_count; | |
173 | |
174 static oop _null_ptr_exception_instance; // preallocated exception object | |
175 static oop _arithmetic_exception_instance; // preallocated exception object | |
176 static oop _virtual_machine_error_instance; // preallocated exception object | |
177 // The object used as an exception dummy when exceptions are thrown for | |
178 // the vm thread. | |
179 static oop _vm_exception; | |
180 | |
181 // The particular choice of collected heap. | |
182 static CollectedHeap* _collectedHeap; | |
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183 |
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184 static intptr_t _non_oop_bits; |
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185 |
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186 // For UseCompressedOops. |
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187 static struct NarrowPtrStruct _narrow_oop; |
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188 // For UseCompressedClassPointers. |
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189 static struct NarrowPtrStruct _narrow_klass; |
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190 static address _narrow_ptrs_base; |
0 | 191 |
192 // array of dummy objects used with +FullGCAlot | |
193 debug_only(static objArrayOop _fullgc_alot_dummy_array;) | |
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194 // index of next entry to clear |
0 | 195 debug_only(static int _fullgc_alot_dummy_next;) |
196 | |
197 // Compiler/dispatch support | |
198 static int _base_vtable_size; // Java vtbl size of klass Object (in words) | |
199 | |
200 // Initialization | |
201 static bool _bootstrapping; // true during genesis | |
202 static bool _fully_initialized; // true after universe_init and initialize_vtables called | |
203 | |
204 // the array of preallocated errors with backtraces | |
205 static objArrayOop preallocated_out_of_memory_errors() { return _preallocated_out_of_memory_error_array; } | |
206 | |
207 // generate an out of memory error; if possible using an error with preallocated backtrace; | |
208 // otherwise return the given default error. | |
209 static oop gen_out_of_memory_error(oop default_err); | |
210 | |
211 // Historic gc information | |
212 static size_t _heap_capacity_at_last_gc; | |
213 static size_t _heap_used_at_last_gc; | |
214 | |
215 static jint initialize_heap(); | |
216 static void initialize_basic_type_mirrors(TRAPS); | |
217 static void fixup_mirrors(TRAPS); | |
218 | |
219 static void reinitialize_vtable_of(KlassHandle h_k, TRAPS); | |
220 static void reinitialize_itables(TRAPS); | |
221 static void compute_base_vtable_size(); // compute vtable size of class Object | |
222 | |
223 static void genesis(TRAPS); // Create the initial world | |
224 | |
225 // Mirrors for primitive classes (created eagerly) | |
226 static oop check_mirror(oop m) { | |
227 assert(m != NULL, "mirror not initialized"); | |
228 return m; | |
229 } | |
230 | |
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231 static void set_narrow_oop_base(address base) { |
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232 assert(UseCompressedOops, "no compressed oops?"); |
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233 _narrow_oop._base = base; |
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234 } |
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235 static void set_narrow_klass_base(address base) { |
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236 assert(UseCompressedClassPointers, "no compressed klass ptrs?"); |
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237 _narrow_klass._base = base; |
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238 } |
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239 static void set_narrow_oop_use_implicit_null_checks(bool use) { |
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240 assert(UseCompressedOops, "no compressed ptrs?"); |
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241 _narrow_oop._use_implicit_null_checks = use; |
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242 } |
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243 |
0 | 244 // Debugging |
245 static int _verify_count; // number of verifies done | |
246 // True during call to verify(). Should only be set/cleared in verify(). | |
247 static bool _verify_in_progress; | |
248 | |
249 static void compute_verify_oop_data(); | |
250 | |
251 public: | |
252 // Known classes in the VM | |
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253 static Klass* boolArrayKlassObj() { return _boolArrayKlassObj; } |
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254 static Klass* byteArrayKlassObj() { return _byteArrayKlassObj; } |
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255 static Klass* charArrayKlassObj() { return _charArrayKlassObj; } |
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256 static Klass* intArrayKlassObj() { return _intArrayKlassObj; } |
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257 static Klass* shortArrayKlassObj() { return _shortArrayKlassObj; } |
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258 static Klass* longArrayKlassObj() { return _longArrayKlassObj; } |
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259 static Klass* singleArrayKlassObj() { return _singleArrayKlassObj; } |
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260 static Klass* doubleArrayKlassObj() { return _doubleArrayKlassObj; } |
0 | 261 |
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262 static Klass* objectArrayKlassObj() { |
0 | 263 return _objectArrayKlassObj; |
264 } | |
265 | |
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266 static Klass* typeArrayKlassObj(BasicType t) { |
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267 assert((uint)t < T_VOID+1, err_msg("range check for type: %s", type2name(t))); |
0 | 268 assert(_typeArrayKlassObjs[t] != NULL, "domain check"); |
269 return _typeArrayKlassObjs[t]; | |
270 } | |
271 | |
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272 // Known objects in the VM |
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273 static oop int_mirror() { return check_mirror(_int_mirror); } |
0 | 274 static oop float_mirror() { return check_mirror(_float_mirror); } |
275 static oop double_mirror() { return check_mirror(_double_mirror); } | |
276 static oop byte_mirror() { return check_mirror(_byte_mirror); } | |
277 static oop bool_mirror() { return check_mirror(_bool_mirror); } | |
278 static oop char_mirror() { return check_mirror(_char_mirror); } | |
279 static oop long_mirror() { return check_mirror(_long_mirror); } | |
280 static oop short_mirror() { return check_mirror(_short_mirror); } | |
281 static oop void_mirror() { return check_mirror(_void_mirror); } | |
282 | |
283 // table of same | |
284 static oop _mirrors[T_VOID+1]; | |
285 | |
286 static oop java_mirror(BasicType t) { | |
287 assert((uint)t < T_VOID+1, "range check"); | |
288 return check_mirror(_mirrors[t]); | |
289 } | |
290 static oop main_thread_group() { return _main_thread_group; } | |
291 static void set_main_thread_group(oop group) { _main_thread_group = group;} | |
292 | |
293 static oop system_thread_group() { return _system_thread_group; } | |
294 static void set_system_thread_group(oop group) { _system_thread_group = group;} | |
295 | |
296 static objArrayOop the_empty_class_klass_array () { return _the_empty_class_klass_array; } | |
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297 static Array<Klass*>* the_array_interfaces_array() { return _the_array_interfaces_array; } |
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298 static oop the_null_string() { return _the_null_string; } |
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299 static oop the_min_jint_string() { return _the_min_jint_string; } |
11010 | 300 |
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301 static Method* finalizer_register_method() { return _finalizer_register_cache->get_method(); } |
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302 static Method* loader_addClass_method() { return _loader_addClass_cache->get_method(); } |
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303 |
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304 static Method* protection_domain_implies_method() { return _pd_implies_cache->get_method(); } |
11010 | 305 |
0 | 306 static oop null_ptr_exception_instance() { return _null_ptr_exception_instance; } |
307 static oop arithmetic_exception_instance() { return _arithmetic_exception_instance; } | |
308 static oop virtual_machine_error_instance() { return _virtual_machine_error_instance; } | |
309 static oop vm_exception() { return _vm_exception; } | |
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310 static Method* throw_illegal_access_error() { return _throw_illegal_access_error; } |
0 | 311 |
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312 static Array<int>* the_empty_int_array() { return _the_empty_int_array; } |
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313 static Array<u2>* the_empty_short_array() { return _the_empty_short_array; } |
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314 static Array<Method*>* the_empty_method_array() { return _the_empty_method_array; } |
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315 static Array<Klass*>* the_empty_klass_array() { return _the_empty_klass_array; } |
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316 |
0 | 317 // OutOfMemoryError support. Returns an error with the required message. The returned error |
318 // may or may not have a backtrace. If error has a backtrace then the stack trace is already | |
319 // filled in. | |
320 static oop out_of_memory_error_java_heap() { return gen_out_of_memory_error(_out_of_memory_error_java_heap); } | |
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321 static oop out_of_memory_error_metaspace() { return gen_out_of_memory_error(_out_of_memory_error_metaspace); } |
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322 static oop out_of_memory_error_class_metaspace() { return gen_out_of_memory_error(_out_of_memory_error_class_metaspace); } |
0 | 323 static oop out_of_memory_error_array_size() { return gen_out_of_memory_error(_out_of_memory_error_array_size); } |
324 static oop out_of_memory_error_gc_overhead_limit() { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit); } | |
325 | |
326 // Accessors needed for fast allocation | |
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327 static Klass** boolArrayKlassObj_addr() { return &_boolArrayKlassObj; } |
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328 static Klass** byteArrayKlassObj_addr() { return &_byteArrayKlassObj; } |
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329 static Klass** charArrayKlassObj_addr() { return &_charArrayKlassObj; } |
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330 static Klass** intArrayKlassObj_addr() { return &_intArrayKlassObj; } |
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331 static Klass** shortArrayKlassObj_addr() { return &_shortArrayKlassObj; } |
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332 static Klass** longArrayKlassObj_addr() { return &_longArrayKlassObj; } |
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333 static Klass** singleArrayKlassObj_addr() { return &_singleArrayKlassObj; } |
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334 static Klass** doubleArrayKlassObj_addr() { return &_doubleArrayKlassObj; } |
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335 static Klass** objectArrayKlassObj_addr() { return &_objectArrayKlassObj; } |
0 | 336 |
337 // The particular choice of collected heap. | |
338 static CollectedHeap* heap() { return _collectedHeap; } | |
339 | |
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340 // For UseCompressedOops |
10405 | 341 // Narrow Oop encoding mode: |
342 // 0 - Use 32-bits oops without encoding when | |
343 // NarrowOopHeapBaseMin + heap_size < 4Gb | |
344 // 1 - Use zero based compressed oops with encoding when | |
345 // NarrowOopHeapBaseMin + heap_size < 32Gb | |
346 // 2 - Use compressed oops with heap base + encoding. | |
347 enum NARROW_OOP_MODE { | |
348 UnscaledNarrowOop = 0, | |
349 ZeroBasedNarrowOop = 1, | |
350 HeapBasedNarrowOop = 2 | |
351 }; | |
352 static NARROW_OOP_MODE narrow_oop_mode(); | |
353 static const char* narrow_oop_mode_to_string(NARROW_OOP_MODE mode); | |
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354 static char* preferred_heap_base(size_t heap_size, size_t alignment, NARROW_OOP_MODE mode); |
10405 | 355 static char* preferred_metaspace_base(size_t heap_size, NARROW_OOP_MODE mode); |
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356 static address narrow_oop_base() { return _narrow_oop._base; } |
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357 static bool is_narrow_oop_base(void* addr) { return (narrow_oop_base() == (address)addr); } |
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358 static int narrow_oop_shift() { return _narrow_oop._shift; } |
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359 static bool narrow_oop_use_implicit_null_checks() { return _narrow_oop._use_implicit_null_checks; } |
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360 |
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361 // For UseCompressedClassPointers |
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362 static address narrow_klass_base() { return _narrow_klass._base; } |
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363 static bool is_narrow_klass_base(void* addr) { return (narrow_klass_base() == (address)addr); } |
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364 static int narrow_klass_shift() { return _narrow_klass._shift; } |
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365 static bool narrow_klass_use_implicit_null_checks() { return _narrow_klass._use_implicit_null_checks; } |
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366 |
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367 static address* narrow_ptrs_base_addr() { return &_narrow_ptrs_base; } |
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368 static void set_narrow_ptrs_base(address a) { _narrow_ptrs_base = a; } |
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369 static address narrow_ptrs_base() { return _narrow_ptrs_base; } |
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370 |
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371 // this is set in vm_version on sparc (and then reset in universe afaict) |
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372 static void set_narrow_oop_shift(int shift) { |
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373 _narrow_oop._shift = shift; |
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374 } |
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375 |
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376 static void set_narrow_klass_shift(int shift) { |
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377 assert(shift == 0 || shift == LogKlassAlignmentInBytes, "invalid shift for klass ptrs"); |
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378 _narrow_klass._shift = shift; |
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379 } |
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380 |
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381 // Reserve Java heap and determine CompressedOops mode |
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382 static ReservedSpace reserve_heap(size_t heap_size, size_t alignment); |
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383 |
0 | 384 // Historic gc information |
385 static size_t get_heap_capacity_at_last_gc() { return _heap_capacity_at_last_gc; } | |
386 static size_t get_heap_free_at_last_gc() { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; } | |
387 static size_t get_heap_used_at_last_gc() { return _heap_used_at_last_gc; } | |
388 static void update_heap_info_at_gc(); | |
389 | |
390 // Testers | |
391 static bool is_bootstrapping() { return _bootstrapping; } | |
392 static bool is_fully_initialized() { return _fully_initialized; } | |
393 | |
394 static inline bool element_type_should_be_aligned(BasicType type); | |
395 static inline bool field_type_should_be_aligned(BasicType type); | |
396 static bool on_page_boundary(void* addr); | |
397 static bool should_fill_in_stack_trace(Handle throwable); | |
398 static void check_alignment(uintx size, uintx alignment, const char* name); | |
399 | |
400 // Finalizer support. | |
401 static void run_finalizers_on_exit(); | |
402 | |
403 // Iteration | |
404 | |
405 // Apply "f" to the addresses of all the direct heap pointers maintained | |
406 // as static fields of "Universe". | |
407 static void oops_do(OopClosure* f, bool do_all = false); | |
408 | |
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409 // CDS support |
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410 static void serialize(SerializeClosure* f, bool do_all = false); |
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411 |
0 | 412 // Apply "f" to all klasses for basic types (classes not present in |
413 // SystemDictionary). | |
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414 static void basic_type_classes_do(void f(Klass*)); |
0 | 415 |
416 // For sharing -- fill in a list of known vtable pointers. | |
417 static void init_self_patching_vtbl_list(void** list, int count); | |
418 | |
419 // Debugging | |
420 static bool verify_in_progress() { return _verify_in_progress; } | |
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421 static void verify(VerifyOption option, const char* prefix, bool silent = VerifySilently); |
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422 static void verify(const char* prefix, bool silent = VerifySilently) { |
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423 verify(VerifyOption_Default, prefix, silent); |
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424 } |
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425 static void verify(bool silent = VerifySilently) { |
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426 verify("", silent); |
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427 } |
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428 |
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429 static int verify_count() { return _verify_count; } |
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430 // The default behavior is to call print_on() on gclog_or_tty. |
0 | 431 static void print(); |
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432 // The extended parameter determines which method on the heap will |
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433 // be called: print_on() (extended == false) or print_extended_on() |
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434 // (extended == true). |
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435 static void print_on(outputStream* st, bool extended = false); |
0 | 436 static void print_heap_at_SIGBREAK(); |
437 static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); } | |
438 static void print_heap_after_gc() { print_heap_after_gc(gclog_or_tty); } | |
4944 | 439 static void print_heap_before_gc(outputStream* st, bool ignore_extended = false); |
440 static void print_heap_after_gc(outputStream* st, bool ignore_extended = false); | |
0 | 441 |
442 // Change the number of dummy objects kept reachable by the full gc dummy | |
443 // array; this should trigger relocation in a sliding compaction collector. | |
444 debug_only(static bool release_fullgc_alot_dummy();) | |
445 // The non-oop pattern (see compiledIC.hpp, etc) | |
446 static void* non_oop_word(); | |
447 | |
448 // Oop verification (see MacroAssembler::verify_oop) | |
449 static uintptr_t verify_oop_mask() PRODUCT_RETURN0; | |
450 static uintptr_t verify_oop_bits() PRODUCT_RETURN0; | |
451 static uintptr_t verify_mark_bits() PRODUCT_RETURN0; | |
452 static uintptr_t verify_mark_mask() PRODUCT_RETURN0; | |
453 | |
454 // Flushing and deoptimization | |
455 static void flush_dependents_on(instanceKlassHandle dependee); | |
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456 static void flush_dependents_on(Handle call_site, Handle method_handle); |
0 | 457 #ifdef HOTSWAP |
458 // Flushing and deoptimization in case of evolution | |
459 static void flush_evol_dependents_on(instanceKlassHandle dependee); | |
460 #endif // HOTSWAP | |
461 // Support for fullspeed debugging | |
462 static void flush_dependents_on_method(methodHandle dependee); | |
463 | |
464 // Compiler support | |
465 static int base_vtable_size() { return _base_vtable_size; } | |
466 }; | |
467 | |
6197 | 468 class DeferredObjAllocEvent : public CHeapObj<mtInternal> { |
0 | 469 private: |
470 oop _oop; | |
471 size_t _bytesize; | |
472 jint _arena_id; | |
473 | |
474 public: | |
475 DeferredObjAllocEvent(const oop o, const size_t s, const jint id) { | |
476 _oop = o; | |
477 _bytesize = s; | |
478 _arena_id = id; | |
479 } | |
480 | |
481 ~DeferredObjAllocEvent() { | |
482 } | |
483 | |
484 jint arena_id() { return _arena_id; } | |
485 size_t bytesize() { return _bytesize; } | |
486 oop get_oop() { return _oop; } | |
487 }; | |
1972 | 488 |
489 #endif // SHARE_VM_MEMORY_UNIVERSE_HPP |