Mercurial > hg > graal-compiler
annotate src/share/vm/oops/klass.cpp @ 20278:2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
author | stefank |
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date | Mon, 07 Jul 2014 10:12:40 +0200 |
parents | 76b588255908 |
children | 6e0cb14ce59b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 #include "precompiled.hpp" |
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26 #include "classfile/javaClasses.hpp" |
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27 #include "classfile/dictionary.hpp" |
1972 | 28 #include "classfile/systemDictionary.hpp" |
29 #include "classfile/vmSymbols.hpp" | |
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30 #include "gc_implementation/shared/markSweep.inline.hpp" |
1972 | 31 #include "gc_interface/collectedHeap.inline.hpp" |
7956 | 32 #include "memory/heapInspection.hpp" |
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33 #include "memory/metadataFactory.hpp" |
1972 | 34 #include "memory/oopFactory.hpp" |
35 #include "memory/resourceArea.hpp" | |
36 #include "oops/instanceKlass.hpp" | |
37 #include "oops/klass.inline.hpp" | |
38 #include "oops/oop.inline2.hpp" | |
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39 #include "runtime/atomic.inline.hpp" |
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40 #include "runtime/orderAccess.inline.hpp" |
10405 | 41 #include "trace/traceMacros.hpp" |
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42 #include "utilities/stack.hpp" |
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43 #include "utilities/macros.hpp" |
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44 #if INCLUDE_ALL_GCS |
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45 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
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46 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" |
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47 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" |
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48 #include "gc_implementation/parallelScavenge/psScavenge.hpp" |
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49 #endif // INCLUDE_ALL_GCS |
0 | 50 |
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51 void Klass::set_name(Symbol* n) { |
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52 _name = n; |
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53 if (_name != NULL) _name->increment_refcount(); |
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54 } |
0 | 55 |
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56 bool Klass::is_subclass_of(const Klass* k) const { |
0 | 57 // Run up the super chain and check |
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58 if (this == k) return true; |
0 | 59 |
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60 Klass* t = const_cast<Klass*>(this)->super(); |
0 | 61 |
62 while (t != NULL) { | |
63 if (t == k) return true; | |
6983 | 64 t = t->super(); |
0 | 65 } |
66 return false; | |
67 } | |
68 | |
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69 bool Klass::search_secondary_supers(Klass* k) const { |
0 | 70 // Put some extra logic here out-of-line, before the search proper. |
71 // This cuts down the size of the inline method. | |
72 | |
73 // This is necessary, since I am never in my own secondary_super list. | |
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74 if (this == k) |
0 | 75 return true; |
76 // Scan the array-of-objects for a match | |
77 int cnt = secondary_supers()->length(); | |
78 for (int i = 0; i < cnt; i++) { | |
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79 if (secondary_supers()->at(i) == k) { |
0 | 80 ((Klass*)this)->set_secondary_super_cache(k); |
81 return true; | |
82 } | |
83 } | |
84 return false; | |
85 } | |
86 | |
87 // Return self, except for abstract classes with exactly 1 | |
88 // implementor. Then return the 1 concrete implementation. | |
89 Klass *Klass::up_cast_abstract() { | |
90 Klass *r = this; | |
91 while( r->is_abstract() ) { // Receiver is abstract? | |
92 Klass *s = r->subklass(); // Check for exactly 1 subklass | |
93 if( !s || s->next_sibling() ) // Oops; wrong count; give up | |
94 return this; // Return 'this' as a no-progress flag | |
95 r = s; // Loop till find concrete class | |
96 } | |
97 return r; // Return the 1 concrete class | |
98 } | |
99 | |
605 | 100 // Find LCA in class hierarchy |
0 | 101 Klass *Klass::LCA( Klass *k2 ) { |
102 Klass *k1 = this; | |
103 while( 1 ) { | |
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104 if( k1->is_subtype_of(k2) ) return k2; |
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105 if( k2->is_subtype_of(k1) ) return k1; |
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106 k1 = k1->super(); |
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107 k2 = k2->super(); |
0 | 108 } |
109 } | |
110 | |
111 | |
112 void Klass::check_valid_for_instantiation(bool throwError, TRAPS) { | |
113 ResourceMark rm(THREAD); | |
114 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError() | |
115 : vmSymbols::java_lang_InstantiationException(), external_name()); | |
116 } | |
117 | |
118 | |
119 void Klass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) { | |
120 THROW(vmSymbols::java_lang_ArrayStoreException()); | |
121 } | |
122 | |
123 | |
124 void Klass::initialize(TRAPS) { | |
125 ShouldNotReachHere(); | |
126 } | |
127 | |
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128 bool Klass::compute_is_subtype_of(Klass* k) { |
0 | 129 assert(k->is_klass(), "argument must be a class"); |
130 return is_subclass_of(k); | |
131 } | |
132 | |
133 | |
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134 Method* Klass::uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const { |
0 | 135 #ifdef ASSERT |
136 tty->print_cr("Error: uncached_lookup_method called on a klass oop." | |
137 " Likely error: reflection method does not correctly" | |
138 " wrap return value in a mirror object."); | |
139 #endif | |
140 ShouldNotReachHere(); | |
141 return NULL; | |
142 } | |
143 | |
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144 void* Klass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) throw() { |
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145 return Metaspace::allocate(loader_data, word_size, /*read_only*/false, |
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146 MetaspaceObj::ClassType, CHECK_NULL); |
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147 } |
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148 |
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149 Klass::Klass() { |
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150 Klass* k = this; |
0 | 151 |
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152 // Preinitialize supertype information. |
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153 // A later call to initialize_supers() may update these settings: |
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154 set_super(NULL); |
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155 for (juint i = 0; i < Klass::primary_super_limit(); i++) { |
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156 _primary_supers[i] = NULL; |
0 | 157 } |
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158 set_secondary_supers(NULL); |
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159 set_secondary_super_cache(NULL); |
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160 _primary_supers[0] = k; |
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161 set_super_check_offset(in_bytes(primary_supers_offset())); |
0 | 162 |
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163 // The constructor is used from init_self_patching_vtbl_list, |
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164 // which doesn't zero out the memory before calling the constructor. |
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165 // Need to set the field explicitly to not hit an assert that the field |
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166 // should be NULL before setting it. |
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167 _java_mirror = NULL; |
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168 |
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169 set_modifier_flags(0); |
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170 set_layout_helper(Klass::_lh_neutral_value); |
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171 set_name(NULL); |
0 | 172 AccessFlags af; |
173 af.set_flags(0); | |
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174 set_access_flags(af); |
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175 set_subklass(NULL); |
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176 set_next_sibling(NULL); |
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177 set_next_link(NULL); |
10405 | 178 TRACE_INIT_ID(this); |
0 | 179 |
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180 set_prototype_header(markOopDesc::prototype()); |
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181 set_biased_lock_revocation_count(0); |
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182 set_last_biased_lock_bulk_revocation_time(0); |
0 | 183 |
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184 // The klass doesn't have any references at this point. |
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185 clear_modified_oops(); |
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186 clear_accumulated_modified_oops(); |
0 | 187 } |
188 | |
189 jint Klass::array_layout_helper(BasicType etype) { | |
190 assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype"); | |
191 // Note that T_ARRAY is not allowed here. | |
192 int hsize = arrayOopDesc::base_offset_in_bytes(etype); | |
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193 int esize = type2aelembytes(etype); |
0 | 194 bool isobj = (etype == T_OBJECT); |
195 int tag = isobj ? _lh_array_tag_obj_value : _lh_array_tag_type_value; | |
196 int lh = array_layout_helper(tag, hsize, etype, exact_log2(esize)); | |
197 | |
198 assert(lh < (int)_lh_neutral_value, "must look like an array layout"); | |
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199 assert(layout_helper_is_array(lh), "correct kind"); |
0 | 200 assert(layout_helper_is_objArray(lh) == isobj, "correct kind"); |
201 assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind"); | |
202 assert(layout_helper_header_size(lh) == hsize, "correct decode"); | |
203 assert(layout_helper_element_type(lh) == etype, "correct decode"); | |
204 assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode"); | |
205 | |
206 return lh; | |
207 } | |
208 | |
209 bool Klass::can_be_primary_super_slow() const { | |
210 if (super() == NULL) | |
211 return true; | |
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212 else if (super()->super_depth() >= primary_super_limit()-1) |
0 | 213 return false; |
214 else | |
215 return true; | |
216 } | |
217 | |
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218 void Klass::initialize_supers(Klass* k, TRAPS) { |
0 | 219 if (FastSuperclassLimit == 0) { |
220 // None of the other machinery matters. | |
221 set_super(k); | |
222 return; | |
223 } | |
224 if (k == NULL) { | |
225 set_super(NULL); | |
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226 _primary_supers[0] = this; |
0 | 227 assert(super_depth() == 0, "Object must already be initialized properly"); |
1142 | 228 } else if (k != super() || k == SystemDictionary::Object_klass()) { |
229 assert(super() == NULL || super() == SystemDictionary::Object_klass(), | |
0 | 230 "initialize this only once to a non-trivial value"); |
231 set_super(k); | |
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232 Klass* sup = k; |
0 | 233 int sup_depth = sup->super_depth(); |
234 juint my_depth = MIN2(sup_depth + 1, (int)primary_super_limit()); | |
235 if (!can_be_primary_super_slow()) | |
236 my_depth = primary_super_limit(); | |
237 for (juint i = 0; i < my_depth; i++) { | |
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238 _primary_supers[i] = sup->_primary_supers[i]; |
0 | 239 } |
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240 Klass* *super_check_cell; |
0 | 241 if (my_depth < primary_super_limit()) { |
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242 _primary_supers[my_depth] = this; |
0 | 243 super_check_cell = &_primary_supers[my_depth]; |
244 } else { | |
245 // Overflow of the primary_supers array forces me to be secondary. | |
246 super_check_cell = &_secondary_super_cache; | |
247 } | |
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248 set_super_check_offset((address)super_check_cell - (address) this); |
0 | 249 |
250 #ifdef ASSERT | |
251 { | |
252 juint j = super_depth(); | |
253 assert(j == my_depth, "computed accessor gets right answer"); | |
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254 Klass* t = this; |
6983 | 255 while (!t->can_be_primary_super()) { |
256 t = t->super(); | |
257 j = t->super_depth(); | |
0 | 258 } |
259 for (juint j1 = j+1; j1 < primary_super_limit(); j1++) { | |
260 assert(primary_super_of_depth(j1) == NULL, "super list padding"); | |
261 } | |
262 while (t != NULL) { | |
263 assert(primary_super_of_depth(j) == t, "super list initialization"); | |
6983 | 264 t = t->super(); |
0 | 265 --j; |
266 } | |
267 assert(j == (juint)-1, "correct depth count"); | |
268 } | |
269 #endif | |
270 } | |
271 | |
272 if (secondary_supers() == NULL) { | |
273 KlassHandle this_kh (THREAD, this); | |
274 | |
275 // Now compute the list of secondary supertypes. | |
276 // Secondaries can occasionally be on the super chain, | |
277 // if the inline "_primary_supers" array overflows. | |
278 int extras = 0; | |
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279 Klass* p; |
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280 for (p = super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) { |
0 | 281 ++extras; |
282 } | |
283 | |
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284 ResourceMark rm(THREAD); // need to reclaim GrowableArrays allocated below |
0 | 285 |
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286 // Compute the "real" non-extra secondaries. |
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287 GrowableArray<Klass*>* secondaries = compute_secondary_supers(extras); |
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288 if (secondaries == NULL) { |
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289 // secondary_supers set by compute_secondary_supers |
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290 return; |
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291 } |
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292 |
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293 GrowableArray<Klass*>* primaries = new GrowableArray<Klass*>(extras); |
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294 |
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295 for (p = this_kh->super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) { |
0 | 296 int i; // Scan for overflow primaries being duplicates of 2nd'arys |
297 | |
298 // This happens frequently for very deeply nested arrays: the | |
299 // primary superclass chain overflows into the secondary. The | |
300 // secondary list contains the element_klass's secondaries with | |
301 // an extra array dimension added. If the element_klass's | |
302 // secondary list already contains some primary overflows, they | |
303 // (with the extra level of array-ness) will collide with the | |
304 // normal primary superclass overflows. | |
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305 for( i = 0; i < secondaries->length(); i++ ) { |
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306 if( secondaries->at(i) == p ) |
0 | 307 break; |
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308 } |
0 | 309 if( i < secondaries->length() ) |
310 continue; // It's a dup, don't put it in | |
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311 primaries->push(p); |
0 | 312 } |
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313 // Combine the two arrays into a metadata object to pack the array. |
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314 // The primaries are added in the reverse order, then the secondaries. |
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315 int new_length = primaries->length() + secondaries->length(); |
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316 Array<Klass*>* s2 = MetadataFactory::new_array<Klass*>( |
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317 class_loader_data(), new_length, CHECK); |
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318 int fill_p = primaries->length(); |
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319 for (int j = 0; j < fill_p; j++) { |
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320 s2->at_put(j, primaries->pop()); // add primaries in reverse order. |
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321 } |
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322 for( int j = 0; j < secondaries->length(); j++ ) { |
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323 s2->at_put(j+fill_p, secondaries->at(j)); // add secondaries on the end. |
0 | 324 } |
325 | |
326 #ifdef ASSERT | |
327 // We must not copy any NULL placeholders left over from bootstrap. | |
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328 for (int j = 0; j < s2->length(); j++) { |
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329 assert(s2->at(j) != NULL, "correct bootstrapping order"); |
0 | 330 } |
331 #endif | |
332 | |
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333 this_kh->set_secondary_supers(s2); |
0 | 334 } |
335 } | |
336 | |
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337 GrowableArray<Klass*>* Klass::compute_secondary_supers(int num_extra_slots) { |
0 | 338 assert(num_extra_slots == 0, "override for complex klasses"); |
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339 set_secondary_supers(Universe::the_empty_klass_array()); |
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340 return NULL; |
0 | 341 } |
342 | |
343 | |
344 Klass* Klass::subklass() const { | |
6983 | 345 return _subklass == NULL ? NULL : _subklass; |
0 | 346 } |
347 | |
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348 InstanceKlass* Klass::superklass() const { |
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349 assert(super() == NULL || super()->oop_is_instance(), "must be instance klass"); |
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350 return _super == NULL ? NULL : InstanceKlass::cast(_super); |
0 | 351 } |
352 | |
353 Klass* Klass::next_sibling() const { | |
6983 | 354 return _next_sibling == NULL ? NULL : _next_sibling; |
0 | 355 } |
356 | |
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357 void Klass::set_subklass(Klass* s) { |
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358 assert(s != this, "sanity check"); |
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359 _subklass = s; |
0 | 360 } |
361 | |
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362 void Klass::set_next_sibling(Klass* s) { |
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363 assert(s != this, "sanity check"); |
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364 _next_sibling = s; |
0 | 365 } |
366 | |
367 void Klass::append_to_sibling_list() { | |
6867 | 368 debug_only(verify();) |
0 | 369 // add ourselves to superklass' subklass list |
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370 InstanceKlass* super = superklass(); |
0 | 371 if (super == NULL) return; // special case: class Object |
6867 | 372 assert((!super->is_interface() // interfaces cannot be supers |
0 | 373 && (super->superklass() == NULL || !is_interface())), |
374 "an interface can only be a subklass of Object"); | |
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375 Klass* prev_first_subklass = super->subklass_oop(); |
0 | 376 if (prev_first_subklass != NULL) { |
377 // set our sibling to be the superklass' previous first subklass | |
378 set_next_sibling(prev_first_subklass); | |
379 } | |
380 // make ourselves the superklass' first subklass | |
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381 super->set_subklass(this); |
6867 | 382 debug_only(verify();) |
0 | 383 } |
384 | |
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385 bool Klass::is_loader_alive(BoolObjectClosure* is_alive) { |
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386 #ifdef ASSERT |
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387 // The class is alive iff the class loader is alive. |
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388 oop loader = class_loader(); |
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389 bool loader_alive = (loader == NULL) || is_alive->do_object_b(loader); |
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390 #endif // ASSERT |
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391 |
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392 // The class is alive if it's mirror is alive (which should be marked if the |
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393 // loader is alive) unless it's an anoymous class. |
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394 bool mirror_alive = is_alive->do_object_b(java_mirror()); |
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395 assert(!mirror_alive || loader_alive, "loader must be alive if the mirror is" |
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396 " but not the other way around with anonymous classes"); |
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397 return mirror_alive; |
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398 } |
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399 |
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400 void Klass::clean_weak_klass_links(BoolObjectClosure* is_alive, bool clean_alive_klasses) { |
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401 if (!ClassUnloading) { |
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402 return; |
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403 } |
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404 |
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405 Klass* root = SystemDictionary::Object_klass(); |
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406 Stack<Klass*, mtGC> stack; |
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407 |
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408 stack.push(root); |
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409 while (!stack.is_empty()) { |
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410 Klass* current = stack.pop(); |
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411 |
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412 assert(current->is_loader_alive(is_alive), "just checking, this should be live"); |
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413 |
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414 // Find and set the first alive subklass |
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415 Klass* sub = current->subklass_oop(); |
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416 while (sub != NULL && !sub->is_loader_alive(is_alive)) { |
0 | 417 #ifndef PRODUCT |
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418 if (TraceClassUnloading && WizardMode) { |
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419 ResourceMark rm; |
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420 tty->print_cr("[Unlinking class (subclass) %s]", sub->external_name()); |
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421 } |
0 | 422 #endif |
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423 sub = sub->next_sibling_oop(); |
0 | 424 } |
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425 current->set_subklass(sub); |
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426 if (sub != NULL) { |
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427 stack.push(sub); |
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428 } |
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429 |
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430 // Find and set the first alive sibling |
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431 Klass* sibling = current->next_sibling_oop(); |
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432 while (sibling != NULL && !sibling->is_loader_alive(is_alive)) { |
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433 if (TraceClassUnloading && WizardMode) { |
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434 ResourceMark rm; |
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435 tty->print_cr("[Unlinking class (sibling) %s]", sibling->external_name()); |
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436 } |
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437 sibling = sibling->next_sibling_oop(); |
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438 } |
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439 current->set_next_sibling(sibling); |
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440 if (sibling != NULL) { |
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441 stack.push(sibling); |
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442 } |
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443 |
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444 // Clean the implementors list and method data. |
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445 if (clean_alive_klasses && current->oop_is_instance()) { |
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446 InstanceKlass* ik = InstanceKlass::cast(current); |
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447 ik->clean_implementors_list(is_alive); |
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448 ik->clean_method_data(is_alive); |
0 | 449 } |
450 } | |
451 } | |
452 | |
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453 void Klass::klass_update_barrier_set(oop v) { |
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454 record_modified_oops(); |
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455 } |
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456 |
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457 // This barrier is used by G1 to remember the old oop values, so |
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458 // that we don't forget any objects that were live at the snapshot at |
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459 // the beginning. This function is only used when we write oops into Klasses. |
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460 void Klass::klass_update_barrier_set_pre(oop* p, oop v) { |
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461 #if INCLUDE_ALL_GCS |
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462 if (UseG1GC) { |
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463 oop obj = *p; |
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464 if (obj != NULL) { |
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465 G1SATBCardTableModRefBS::enqueue(obj); |
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466 } |
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467 } |
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468 #endif |
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469 } |
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470 |
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471 void Klass::klass_oop_store(oop* p, oop v) { |
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472 assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata"); |
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473 assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object"); |
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474 |
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475 // do the store |
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476 if (always_do_update_barrier) { |
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477 klass_oop_store((volatile oop*)p, v); |
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478 } else { |
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479 klass_update_barrier_set_pre(p, v); |
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480 *p = v; |
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481 klass_update_barrier_set(v); |
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482 } |
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483 } |
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484 |
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485 void Klass::klass_oop_store(volatile oop* p, oop v) { |
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486 assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata"); |
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487 assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object"); |
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488 |
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489 klass_update_barrier_set_pre((oop*)p, v); // Cast away volatile. |
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490 OrderAccess::release_store_ptr(p, v); |
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491 klass_update_barrier_set(v); |
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492 } |
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493 |
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494 void Klass::oops_do(OopClosure* cl) { |
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495 cl->do_oop(&_java_mirror); |
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496 } |
0 | 497 |
498 void Klass::remove_unshareable_info() { | |
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499 assert (DumpSharedSpaces, "only called for DumpSharedSpaces"); |
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500 |
0 | 501 set_subklass(NULL); |
502 set_next_sibling(NULL); | |
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503 // Clear the java mirror |
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504 set_java_mirror(NULL); |
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505 set_next_link(NULL); |
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506 |
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507 // Null out class_loader_data because we don't share that yet. |
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508 set_class_loader_data(NULL); |
0 | 509 } |
510 | |
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511 void Klass::restore_unshareable_info(TRAPS) { |
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512 TRACE_INIT_ID(this); |
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513 // If an exception happened during CDS restore, some of these fields may already be |
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514 // set. We leave the class on the CLD list, even if incomplete so that we don't |
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515 // modify the CLD list outside a safepoint. |
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516 if (class_loader_data() == NULL) { |
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517 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); |
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518 // Restore class_loader_data to the null class loader data |
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519 set_class_loader_data(loader_data); |
0 | 520 |
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521 // Add to null class loader list first before creating the mirror |
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522 // (same order as class file parsing) |
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523 loader_data->add_class(this); |
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524 } |
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525 |
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526 // Recreate the class mirror. The protection_domain is always null for |
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527 // boot loader, for now. |
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528 // Only recreate it if not present. A previous attempt to restore may have |
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529 // gotten an OOM later but keep the mirror if it was created. |
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530 if (java_mirror() == NULL) { |
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531 java_lang_Class::create_mirror(this, Handle(NULL), CHECK); |
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532 } |
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533 } |
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534 |
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535 Klass* Klass::array_klass_or_null(int rank) { |
0 | 536 EXCEPTION_MARK; |
537 // No exception can be thrown by array_klass_impl when called with or_null == true. | |
538 // (In anycase, the execption mark will fail if it do so) | |
539 return array_klass_impl(true, rank, THREAD); | |
540 } | |
541 | |
542 | |
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543 Klass* Klass::array_klass_or_null() { |
0 | 544 EXCEPTION_MARK; |
545 // No exception can be thrown by array_klass_impl when called with or_null == true. | |
546 // (In anycase, the execption mark will fail if it do so) | |
547 return array_klass_impl(true, THREAD); | |
548 } | |
549 | |
550 | |
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551 Klass* Klass::array_klass_impl(bool or_null, int rank, TRAPS) { |
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552 fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass"); |
0 | 553 return NULL; |
554 } | |
555 | |
556 | |
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557 Klass* Klass::array_klass_impl(bool or_null, TRAPS) { |
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558 fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass"); |
0 | 559 return NULL; |
560 } | |
561 | |
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562 oop Klass::class_loader() const { return class_loader_data()->class_loader(); } |
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563 |
0 | 564 const char* Klass::external_name() const { |
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565 if (oop_is_instance()) { |
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566 InstanceKlass* ik = (InstanceKlass*) this; |
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567 if (ik->is_anonymous()) { |
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568 assert(EnableInvokeDynamic, ""); |
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569 intptr_t hash = 0; |
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570 if (ik->java_mirror() != NULL) { |
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571 // java_mirror might not be created yet, return 0 as hash. |
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572 hash = ik->java_mirror()->identity_hash(); |
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573 } |
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574 char hash_buf[40]; |
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575 sprintf(hash_buf, "/" UINTX_FORMAT, (uintx)hash); |
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576 size_t hash_len = strlen(hash_buf); |
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577 |
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578 size_t result_len = name()->utf8_length(); |
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579 char* result = NEW_RESOURCE_ARRAY(char, result_len + hash_len + 1); |
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580 name()->as_klass_external_name(result, (int) result_len + 1); |
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581 assert(strlen(result) == result_len, ""); |
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582 strcpy(result + result_len, hash_buf); |
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583 assert(strlen(result) == result_len + hash_len, ""); |
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584 return result; |
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585 } |
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586 } |
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587 if (name() == NULL) return "<unknown>"; |
0 | 588 return name()->as_klass_external_name(); |
589 } | |
590 | |
591 | |
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592 const char* Klass::signature_name() const { |
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593 if (name() == NULL) return "<unknown>"; |
0 | 594 return name()->as_C_string(); |
595 } | |
596 | |
597 // Unless overridden, modifier_flags is 0. | |
598 jint Klass::compute_modifier_flags(TRAPS) const { | |
599 return 0; | |
600 } | |
601 | |
602 int Klass::atomic_incr_biased_lock_revocation_count() { | |
603 return (int) Atomic::add(1, &_biased_lock_revocation_count); | |
604 } | |
605 | |
606 // Unless overridden, jvmti_class_status has no flags set. | |
607 jint Klass::jvmti_class_status() const { | |
608 return 0; | |
609 } | |
610 | |
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611 |
0 | 612 // Printing |
613 | |
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614 void Klass::print_on(outputStream* st) const { |
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615 ResourceMark rm; |
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616 // print title |
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617 st->print("%s", internal_name()); |
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618 print_address_on(st); |
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619 st->cr(); |
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620 } |
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621 |
0 | 622 void Klass::oop_print_on(oop obj, outputStream* st) { |
623 ResourceMark rm; | |
624 // print title | |
625 st->print_cr("%s ", internal_name()); | |
626 obj->print_address_on(st); | |
627 | |
628 if (WizardMode) { | |
629 // print header | |
630 obj->mark()->print_on(st); | |
631 } | |
632 | |
633 // print class | |
634 st->print(" - klass: "); | |
635 obj->klass()->print_value_on(st); | |
636 st->cr(); | |
637 } | |
638 | |
639 void Klass::oop_print_value_on(oop obj, outputStream* st) { | |
640 // print title | |
641 ResourceMark rm; // Cannot print in debug mode without this | |
642 st->print("%s", internal_name()); | |
643 obj->print_address_on(st); | |
644 } | |
645 | |
7956 | 646 #if INCLUDE_SERVICES |
647 // Size Statistics | |
648 void Klass::collect_statistics(KlassSizeStats *sz) const { | |
649 sz->_klass_bytes = sz->count(this); | |
650 sz->_mirror_bytes = sz->count(java_mirror()); | |
651 sz->_secondary_supers_bytes = sz->count_array(secondary_supers()); | |
652 | |
653 sz->_ro_bytes += sz->_secondary_supers_bytes; | |
654 sz->_rw_bytes += sz->_klass_bytes + sz->_mirror_bytes; | |
655 } | |
656 #endif // INCLUDE_SERVICES | |
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657 |
0 | 658 // Verification |
659 | |
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660 void Klass::verify_on(outputStream* st) { |
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661 |
11034 | 662 // This can be expensive, but it is worth checking that this klass is actually |
663 // in the CLD graph but not in production. | |
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664 assert(Metaspace::contains((address)this), "Should be"); |
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665 |
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666 guarantee(this->is_klass(),"should be klass"); |
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667 |
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668 if (super() != NULL) { |
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669 guarantee(super()->is_klass(), "should be klass"); |
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670 } |
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671 if (secondary_super_cache() != NULL) { |
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672 Klass* ko = secondary_super_cache(); |
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673 guarantee(ko->is_klass(), "should be klass"); |
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674 } |
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675 for ( uint i = 0; i < primary_super_limit(); i++ ) { |
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676 Klass* ko = _primary_supers[i]; |
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677 if (ko != NULL) { |
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678 guarantee(ko->is_klass(), "should be klass"); |
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679 } |
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680 } |
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681 |
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682 if (java_mirror() != NULL) { |
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683 guarantee(java_mirror()->is_oop(), "should be instance"); |
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684 } |
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685 } |
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686 |
0 | 687 void Klass::oop_verify_on(oop obj, outputStream* st) { |
688 guarantee(obj->is_oop(), "should be oop"); | |
689 guarantee(obj->klass()->is_klass(), "klass field is not a klass"); | |
690 } | |
691 | |
692 #ifndef PRODUCT | |
693 | |
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694 bool Klass::verify_vtable_index(int i) { |
0 | 695 if (oop_is_instance()) { |
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696 int limit = ((InstanceKlass*)this)->vtable_length()/vtableEntry::size(); |
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697 assert(i >= 0 && i < limit, err_msg("index %d out of bounds %d", i, limit)); |
0 | 698 } else { |
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699 assert(oop_is_array(), "Must be"); |
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700 int limit = ((ArrayKlass*)this)->vtable_length()/vtableEntry::size(); |
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701 assert(i >= 0 && i < limit, err_msg("index %d out of bounds %d", i, limit)); |
0 | 702 } |
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703 return true; |
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704 } |
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705 |
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706 bool Klass::verify_itable_index(int i) { |
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707 assert(oop_is_instance(), ""); |
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708 int method_count = klassItable::method_count_for_interface(this); |
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709 assert(i >= 0 && i < method_count, "index out of bounds"); |
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710 return true; |
0 | 711 } |
712 | |
713 #endif | |
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714 |
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715 /////////////// Unit tests /////////////// |
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716 |
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717 #ifndef PRODUCT |
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718 |
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719 class TestKlass { |
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720 public: |
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721 static void test_oop_is_instanceClassLoader() { |
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722 assert(SystemDictionary::ClassLoader_klass()->oop_is_instanceClassLoader(), "assert"); |
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723 assert(!SystemDictionary::String_klass()->oop_is_instanceClassLoader(), "assert"); |
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724 } |
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725 }; |
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726 |
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727 void TestKlass_test() { |
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728 TestKlass::test_oop_is_instanceClassLoader(); |
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729 } |
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730 |
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731 #endif |