Mercurial > hg > graal-jvmci-8
annotate src/share/vm/oops/klass.cpp @ 23660:b5f3a471e646
Merge.
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Wed, 01 Jun 2016 00:11:44 +0200 |
| parents | 7848fc12602b 5cece4584b8e |
| children |
| rev | line source |
|---|---|
| 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 | |
| 18046 | 133 Klass* Klass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
| 134 #ifdef ASSERT | |
| 135 tty->print_cr("Error: find_field called on a klass oop." | |
| 136 " Likely error: reflection method does not correctly" | |
| 137 " wrap return value in a mirror object."); | |
| 138 #endif | |
| 139 ShouldNotReachHere(); | |
| 140 return NULL; | |
| 141 } | |
| 0 | 142 |
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143 Method* Klass::uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const { |
| 0 | 144 #ifdef ASSERT |
| 145 tty->print_cr("Error: uncached_lookup_method called on a klass oop." | |
| 146 " Likely error: reflection method does not correctly" | |
| 147 " wrap return value in a mirror object."); | |
| 148 #endif | |
| 149 ShouldNotReachHere(); | |
| 150 return NULL; | |
| 151 } | |
| 152 | |
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153 void* Klass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) throw() { |
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154 return Metaspace::allocate(loader_data, word_size, /*read_only*/false, |
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155 MetaspaceObj::ClassType, CHECK_NULL); |
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156 } |
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157 |
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158 Klass::Klass() { |
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159 Klass* k = this; |
| 0 | 160 |
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161 // Preinitialize supertype information. |
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162 // A later call to initialize_supers() may update these settings: |
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163 set_super(NULL); |
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164 for (juint i = 0; i < Klass::primary_super_limit(); i++) { |
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165 _primary_supers[i] = NULL; |
| 0 | 166 } |
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167 set_secondary_supers(NULL); |
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168 set_secondary_super_cache(NULL); |
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169 _primary_supers[0] = k; |
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170 set_super_check_offset(in_bytes(primary_supers_offset())); |
| 0 | 171 |
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172 // The constructor is used from init_self_patching_vtbl_list, |
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173 // which doesn't zero out the memory before calling the constructor. |
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174 // Need to set the field explicitly to not hit an assert that the field |
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175 // should be NULL before setting it. |
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176 _java_mirror = NULL; |
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177 |
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178 set_modifier_flags(0); |
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179 set_layout_helper(Klass::_lh_neutral_value); |
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180 set_name(NULL); |
| 0 | 181 AccessFlags af; |
| 182 af.set_flags(0); | |
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183 set_access_flags(af); |
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184 set_subklass(NULL); |
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185 set_next_sibling(NULL); |
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186 set_next_link(NULL); |
| 10405 | 187 TRACE_INIT_ID(this); |
| 0 | 188 |
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189 set_prototype_header(markOopDesc::prototype()); |
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190 set_biased_lock_revocation_count(0); |
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191 set_last_biased_lock_bulk_revocation_time(0); |
| 0 | 192 |
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193 // The klass doesn't have any references at this point. |
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194 clear_modified_oops(); |
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195 clear_accumulated_modified_oops(); |
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196 _shared_class_path_index = -1; |
| 0 | 197 } |
| 198 | |
| 199 jint Klass::array_layout_helper(BasicType etype) { | |
| 200 assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype"); | |
| 201 // Note that T_ARRAY is not allowed here. | |
| 202 int hsize = arrayOopDesc::base_offset_in_bytes(etype); | |
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203 int esize = type2aelembytes(etype); |
| 0 | 204 bool isobj = (etype == T_OBJECT); |
| 205 int tag = isobj ? _lh_array_tag_obj_value : _lh_array_tag_type_value; | |
| 206 int lh = array_layout_helper(tag, hsize, etype, exact_log2(esize)); | |
| 207 | |
| 208 assert(lh < (int)_lh_neutral_value, "must look like an array layout"); | |
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209 assert(layout_helper_is_array(lh), "correct kind"); |
| 0 | 210 assert(layout_helper_is_objArray(lh) == isobj, "correct kind"); |
| 211 assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind"); | |
| 212 assert(layout_helper_header_size(lh) == hsize, "correct decode"); | |
| 213 assert(layout_helper_element_type(lh) == etype, "correct decode"); | |
| 214 assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode"); | |
| 215 | |
| 216 return lh; | |
| 217 } | |
| 218 | |
| 219 bool Klass::can_be_primary_super_slow() const { | |
| 220 if (super() == NULL) | |
| 221 return true; | |
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222 else if (super()->super_depth() >= primary_super_limit()-1) |
| 0 | 223 return false; |
| 224 else | |
| 225 return true; | |
| 226 } | |
| 227 | |
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228 void Klass::initialize_supers(Klass* k, TRAPS) { |
| 0 | 229 if (FastSuperclassLimit == 0) { |
| 230 // None of the other machinery matters. | |
| 231 set_super(k); | |
| 232 return; | |
| 233 } | |
| 234 if (k == NULL) { | |
| 235 set_super(NULL); | |
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236 _primary_supers[0] = this; |
| 0 | 237 assert(super_depth() == 0, "Object must already be initialized properly"); |
| 1142 | 238 } else if (k != super() || k == SystemDictionary::Object_klass()) { |
| 239 assert(super() == NULL || super() == SystemDictionary::Object_klass(), | |
| 0 | 240 "initialize this only once to a non-trivial value"); |
| 241 set_super(k); | |
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242 Klass* sup = k; |
| 0 | 243 int sup_depth = sup->super_depth(); |
| 244 juint my_depth = MIN2(sup_depth + 1, (int)primary_super_limit()); | |
| 245 if (!can_be_primary_super_slow()) | |
| 246 my_depth = primary_super_limit(); | |
| 247 for (juint i = 0; i < my_depth; i++) { | |
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248 _primary_supers[i] = sup->_primary_supers[i]; |
| 0 | 249 } |
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250 Klass* *super_check_cell; |
| 0 | 251 if (my_depth < primary_super_limit()) { |
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252 _primary_supers[my_depth] = this; |
| 0 | 253 super_check_cell = &_primary_supers[my_depth]; |
| 254 } else { | |
| 255 // Overflow of the primary_supers array forces me to be secondary. | |
| 256 super_check_cell = &_secondary_super_cache; | |
| 257 } | |
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258 set_super_check_offset((address)super_check_cell - (address) this); |
| 0 | 259 |
| 260 #ifdef ASSERT | |
| 261 { | |
| 262 juint j = super_depth(); | |
| 263 assert(j == my_depth, "computed accessor gets right answer"); | |
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264 Klass* t = this; |
| 6983 | 265 while (!t->can_be_primary_super()) { |
| 266 t = t->super(); | |
| 267 j = t->super_depth(); | |
| 0 | 268 } |
| 269 for (juint j1 = j+1; j1 < primary_super_limit(); j1++) { | |
| 270 assert(primary_super_of_depth(j1) == NULL, "super list padding"); | |
| 271 } | |
| 272 while (t != NULL) { | |
| 273 assert(primary_super_of_depth(j) == t, "super list initialization"); | |
| 6983 | 274 t = t->super(); |
| 0 | 275 --j; |
| 276 } | |
| 277 assert(j == (juint)-1, "correct depth count"); | |
| 278 } | |
| 279 #endif | |
| 280 } | |
| 281 | |
| 282 if (secondary_supers() == NULL) { | |
| 283 KlassHandle this_kh (THREAD, this); | |
| 284 | |
| 285 // Now compute the list of secondary supertypes. | |
| 286 // Secondaries can occasionally be on the super chain, | |
| 287 // if the inline "_primary_supers" array overflows. | |
| 288 int extras = 0; | |
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289 Klass* p; |
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290 for (p = super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) { |
| 0 | 291 ++extras; |
| 292 } | |
| 293 | |
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294 ResourceMark rm(THREAD); // need to reclaim GrowableArrays allocated below |
| 0 | 295 |
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296 // Compute the "real" non-extra secondaries. |
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297 GrowableArray<Klass*>* secondaries = compute_secondary_supers(extras); |
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298 if (secondaries == NULL) { |
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299 // secondary_supers set by compute_secondary_supers |
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300 return; |
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301 } |
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302 |
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303 GrowableArray<Klass*>* primaries = new GrowableArray<Klass*>(extras); |
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304 |
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305 for (p = this_kh->super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) { |
| 0 | 306 int i; // Scan for overflow primaries being duplicates of 2nd'arys |
| 307 | |
| 308 // This happens frequently for very deeply nested arrays: the | |
| 309 // primary superclass chain overflows into the secondary. The | |
| 310 // secondary list contains the element_klass's secondaries with | |
| 311 // an extra array dimension added. If the element_klass's | |
| 312 // secondary list already contains some primary overflows, they | |
| 313 // (with the extra level of array-ness) will collide with the | |
| 314 // normal primary superclass overflows. | |
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315 for( i = 0; i < secondaries->length(); i++ ) { |
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316 if( secondaries->at(i) == p ) |
| 0 | 317 break; |
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318 } |
| 0 | 319 if( i < secondaries->length() ) |
| 320 continue; // It's a dup, don't put it in | |
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321 primaries->push(p); |
| 0 | 322 } |
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323 // Combine the two arrays into a metadata object to pack the array. |
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324 // The primaries are added in the reverse order, then the secondaries. |
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325 int new_length = primaries->length() + secondaries->length(); |
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326 Array<Klass*>* s2 = MetadataFactory::new_array<Klass*>( |
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327 class_loader_data(), new_length, CHECK); |
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328 int fill_p = primaries->length(); |
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329 for (int j = 0; j < fill_p; j++) { |
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330 s2->at_put(j, primaries->pop()); // add primaries in reverse order. |
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331 } |
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332 for( int j = 0; j < secondaries->length(); j++ ) { |
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333 s2->at_put(j+fill_p, secondaries->at(j)); // add secondaries on the end. |
| 0 | 334 } |
| 335 | |
| 336 #ifdef ASSERT | |
| 337 // We must not copy any NULL placeholders left over from bootstrap. | |
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338 for (int j = 0; j < s2->length(); j++) { |
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339 assert(s2->at(j) != NULL, "correct bootstrapping order"); |
| 0 | 340 } |
| 341 #endif | |
| 342 | |
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343 this_kh->set_secondary_supers(s2); |
| 0 | 344 } |
| 345 } | |
| 346 | |
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347 GrowableArray<Klass*>* Klass::compute_secondary_supers(int num_extra_slots) { |
| 0 | 348 assert(num_extra_slots == 0, "override for complex klasses"); |
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349 set_secondary_supers(Universe::the_empty_klass_array()); |
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350 return NULL; |
| 0 | 351 } |
| 352 | |
| 353 | |
| 354 Klass* Klass::subklass() const { | |
| 6983 | 355 return _subklass == NULL ? NULL : _subklass; |
| 0 | 356 } |
| 357 | |
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358 InstanceKlass* Klass::superklass() const { |
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359 assert(super() == NULL || super()->oop_is_instance(), "must be instance klass"); |
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360 return _super == NULL ? NULL : InstanceKlass::cast(_super); |
| 0 | 361 } |
| 362 | |
| 363 Klass* Klass::next_sibling() const { | |
| 6983 | 364 return _next_sibling == NULL ? NULL : _next_sibling; |
| 0 | 365 } |
| 366 | |
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367 void Klass::set_subklass(Klass* s) { |
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368 assert(s != this, "sanity check"); |
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369 _subklass = s; |
| 0 | 370 } |
| 371 | |
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372 void Klass::set_next_sibling(Klass* s) { |
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373 assert(s != this, "sanity check"); |
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374 _next_sibling = s; |
| 0 | 375 } |
| 376 | |
| 377 void Klass::append_to_sibling_list() { | |
| 6867 | 378 debug_only(verify();) |
| 0 | 379 // add ourselves to superklass' subklass list |
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380 InstanceKlass* super = superklass(); |
| 0 | 381 if (super == NULL) return; // special case: class Object |
| 6867 | 382 assert((!super->is_interface() // interfaces cannot be supers |
| 0 | 383 && (super->superklass() == NULL || !is_interface())), |
| 384 "an interface can only be a subklass of Object"); | |
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385 Klass* prev_first_subklass = super->subklass_oop(); |
| 0 | 386 if (prev_first_subklass != NULL) { |
| 387 // set our sibling to be the superklass' previous first subklass | |
| 388 set_next_sibling(prev_first_subklass); | |
| 389 } | |
| 390 // make ourselves the superklass' first subklass | |
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391 super->set_subklass(this); |
| 6867 | 392 debug_only(verify();) |
| 0 | 393 } |
| 394 | |
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395 bool Klass::is_loader_alive(BoolObjectClosure* is_alive) { |
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396 #ifdef ASSERT |
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397 // The class is alive iff the class loader is alive. |
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398 oop loader = class_loader(); |
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399 bool loader_alive = (loader == NULL) || is_alive->do_object_b(loader); |
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400 #endif // ASSERT |
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401 |
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402 // The class is alive if it's mirror is alive (which should be marked if the |
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403 // loader is alive) unless it's an anoymous class. |
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404 bool mirror_alive = is_alive->do_object_b(java_mirror()); |
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405 assert(!mirror_alive || loader_alive, "loader must be alive if the mirror is" |
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406 " but not the other way around with anonymous classes"); |
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407 return mirror_alive; |
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408 } |
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409 |
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410 void Klass::clean_weak_klass_links(BoolObjectClosure* is_alive, bool clean_alive_klasses) { |
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411 if (!ClassUnloading) { |
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412 return; |
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413 } |
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414 |
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415 Klass* root = SystemDictionary::Object_klass(); |
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416 Stack<Klass*, mtGC> stack; |
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417 |
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418 stack.push(root); |
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419 while (!stack.is_empty()) { |
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420 Klass* current = stack.pop(); |
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421 |
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422 assert(current->is_loader_alive(is_alive), "just checking, this should be live"); |
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423 |
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424 // Find and set the first alive subklass |
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425 Klass* sub = current->subklass_oop(); |
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426 while (sub != NULL && !sub->is_loader_alive(is_alive)) { |
| 0 | 427 #ifndef PRODUCT |
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428 if (TraceClassUnloading && WizardMode) { |
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429 ResourceMark rm; |
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430 tty->print_cr("[Unlinking class (subclass) %s]", sub->external_name()); |
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431 } |
| 0 | 432 #endif |
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433 sub = sub->next_sibling_oop(); |
| 0 | 434 } |
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435 current->set_subklass(sub); |
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436 if (sub != NULL) { |
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437 stack.push(sub); |
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438 } |
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439 |
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440 // Find and set the first alive sibling |
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441 Klass* sibling = current->next_sibling_oop(); |
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442 while (sibling != NULL && !sibling->is_loader_alive(is_alive)) { |
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443 if (TraceClassUnloading && WizardMode) { |
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444 ResourceMark rm; |
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445 tty->print_cr("[Unlinking class (sibling) %s]", sibling->external_name()); |
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446 } |
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447 sibling = sibling->next_sibling_oop(); |
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448 } |
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449 current->set_next_sibling(sibling); |
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450 if (sibling != NULL) { |
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451 stack.push(sibling); |
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452 } |
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453 |
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454 // Clean the implementors list and method data. |
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455 if (clean_alive_klasses && current->oop_is_instance()) { |
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456 InstanceKlass* ik = InstanceKlass::cast(current); |
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457 ik->clean_weak_instanceklass_links(is_alive); |
| 0 | 458 } |
| 459 } | |
| 460 } | |
| 461 | |
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462 void Klass::klass_update_barrier_set(oop v) { |
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463 record_modified_oops(); |
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464 } |
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465 |
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466 // This barrier is used by G1 to remember the old oop values, so |
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467 // that we don't forget any objects that were live at the snapshot at |
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468 // the beginning. This function is only used when we write oops into Klasses. |
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469 void Klass::klass_update_barrier_set_pre(oop* p, oop v) { |
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470 #if INCLUDE_ALL_GCS |
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471 if (UseG1GC) { |
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472 oop obj = *p; |
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473 if (obj != NULL) { |
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474 G1SATBCardTableModRefBS::enqueue(obj); |
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475 } |
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476 } |
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477 #endif |
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478 } |
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479 |
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480 void Klass::klass_oop_store(oop* p, oop v) { |
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481 assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata"); |
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482 assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object"); |
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483 |
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484 // do the store |
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485 if (always_do_update_barrier) { |
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486 klass_oop_store((volatile oop*)p, v); |
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487 } else { |
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488 klass_update_barrier_set_pre(p, v); |
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489 *p = v; |
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490 klass_update_barrier_set(v); |
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491 } |
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492 } |
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493 |
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494 void Klass::klass_oop_store(volatile oop* p, oop v) { |
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495 assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata"); |
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496 assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object"); |
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497 |
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498 klass_update_barrier_set_pre((oop*)p, v); // Cast away volatile. |
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499 OrderAccess::release_store_ptr(p, v); |
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500 klass_update_barrier_set(v); |
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501 } |
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502 |
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503 void Klass::oops_do(OopClosure* cl) { |
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504 cl->do_oop(&_java_mirror); |
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505 } |
| 0 | 506 |
| 507 void Klass::remove_unshareable_info() { | |
|
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508 assert (DumpSharedSpaces, "only called for DumpSharedSpaces"); |
|
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509 |
| 0 | 510 set_subklass(NULL); |
| 511 set_next_sibling(NULL); | |
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512 // Clear the java mirror |
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513 set_java_mirror(NULL); |
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514 set_next_link(NULL); |
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515 |
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516 // Null out class_loader_data because we don't share that yet. |
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517 set_class_loader_data(NULL); |
| 0 | 518 } |
| 519 | |
|
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520 void Klass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) { |
|
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521 TRACE_INIT_ID(this); |
|
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522 // If an exception happened during CDS restore, some of these fields may already be |
|
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523 // set. We leave the class on the CLD list, even if incomplete so that we don't |
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524 // modify the CLD list outside a safepoint. |
|
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525 if (class_loader_data() == NULL) { |
|
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526 // Restore class_loader_data |
|
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527 set_class_loader_data(loader_data); |
| 0 | 528 |
|
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529 // Add to class loader list first before creating the mirror |
|
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530 // (same order as class file parsing) |
|
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531 loader_data->add_class(this); |
|
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532 } |
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533 |
|
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534 // Recreate the class mirror. |
|
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535 // Only recreate it if not present. A previous attempt to restore may have |
|
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536 // gotten an OOM later but keep the mirror if it was created. |
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537 if (java_mirror() == NULL) { |
|
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538 java_lang_Class::create_mirror(this, class_loader(), protection_domain, CHECK); |
|
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|
539 } |
|
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|
540 } |
|
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541 |
|
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542 Klass* Klass::array_klass_or_null(int rank) { |
| 0 | 543 EXCEPTION_MARK; |
| 544 // No exception can be thrown by array_klass_impl when called with or_null == true. | |
| 545 // (In anycase, the execption mark will fail if it do so) | |
| 546 return array_klass_impl(true, rank, THREAD); | |
| 547 } | |
| 548 | |
| 549 | |
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550 Klass* Klass::array_klass_or_null() { |
| 0 | 551 EXCEPTION_MARK; |
| 552 // No exception can be thrown by array_klass_impl when called with or_null == true. | |
| 553 // (In anycase, the execption mark will fail if it do so) | |
| 554 return array_klass_impl(true, THREAD); | |
| 555 } | |
| 556 | |
| 557 | |
|
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558 Klass* Klass::array_klass_impl(bool or_null, int rank, TRAPS) { |
|
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559 fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass"); |
| 0 | 560 return NULL; |
| 561 } | |
| 562 | |
| 563 | |
|
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564 Klass* Klass::array_klass_impl(bool or_null, TRAPS) { |
|
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565 fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass"); |
| 0 | 566 return NULL; |
| 567 } | |
| 568 | |
|
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569 oop Klass::class_loader() const { return class_loader_data()->class_loader(); } |
|
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570 |
| 0 | 571 const char* Klass::external_name() const { |
|
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572 if (oop_is_instance()) { |
|
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573 InstanceKlass* ik = (InstanceKlass*) this; |
|
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|
574 if (ik->is_anonymous()) { |
|
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|
575 assert(EnableInvokeDynamic, ""); |
|
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576 intptr_t hash = 0; |
|
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577 if (ik->java_mirror() != NULL) { |
|
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|
578 // java_mirror might not be created yet, return 0 as hash. |
|
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|
579 hash = ik->java_mirror()->identity_hash(); |
|
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580 } |
|
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|
581 char hash_buf[40]; |
|
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582 sprintf(hash_buf, "/" UINTX_FORMAT, (uintx)hash); |
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583 size_t hash_len = strlen(hash_buf); |
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584 |
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585 size_t result_len = name()->utf8_length(); |
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586 char* result = NEW_RESOURCE_ARRAY(char, result_len + hash_len + 1); |
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587 name()->as_klass_external_name(result, (int) result_len + 1); |
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588 assert(strlen(result) == result_len, ""); |
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589 strcpy(result + result_len, hash_buf); |
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590 assert(strlen(result) == result_len + hash_len, ""); |
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591 return result; |
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592 } |
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593 } |
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594 if (name() == NULL) return "<unknown>"; |
| 0 | 595 return name()->as_klass_external_name(); |
| 596 } | |
| 597 | |
| 598 | |
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599 const char* Klass::signature_name() const { |
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600 if (name() == NULL) return "<unknown>"; |
| 0 | 601 return name()->as_C_string(); |
| 602 } | |
| 603 | |
| 604 // Unless overridden, modifier_flags is 0. | |
| 605 jint Klass::compute_modifier_flags(TRAPS) const { | |
| 606 return 0; | |
| 607 } | |
| 608 | |
| 609 int Klass::atomic_incr_biased_lock_revocation_count() { | |
| 610 return (int) Atomic::add(1, &_biased_lock_revocation_count); | |
| 611 } | |
| 612 | |
| 613 // Unless overridden, jvmti_class_status has no flags set. | |
| 614 jint Klass::jvmti_class_status() const { | |
| 615 return 0; | |
| 616 } | |
| 617 | |
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618 |
| 0 | 619 // Printing |
| 620 | |
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621 void Klass::print_on(outputStream* st) const { |
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622 ResourceMark rm; |
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623 // print title |
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624 st->print("%s", internal_name()); |
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625 print_address_on(st); |
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626 st->cr(); |
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627 } |
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628 |
| 0 | 629 void Klass::oop_print_on(oop obj, outputStream* st) { |
| 630 ResourceMark rm; | |
| 631 // print title | |
| 632 st->print_cr("%s ", internal_name()); | |
| 633 obj->print_address_on(st); | |
| 634 | |
| 635 if (WizardMode) { | |
| 636 // print header | |
| 637 obj->mark()->print_on(st); | |
| 638 } | |
| 639 | |
| 640 // print class | |
| 641 st->print(" - klass: "); | |
| 642 obj->klass()->print_value_on(st); | |
| 643 st->cr(); | |
| 644 } | |
| 645 | |
| 646 void Klass::oop_print_value_on(oop obj, outputStream* st) { | |
| 647 // print title | |
| 648 ResourceMark rm; // Cannot print in debug mode without this | |
| 649 st->print("%s", internal_name()); | |
| 650 obj->print_address_on(st); | |
| 651 } | |
| 652 | |
| 7956 | 653 #if INCLUDE_SERVICES |
| 654 // Size Statistics | |
| 655 void Klass::collect_statistics(KlassSizeStats *sz) const { | |
| 656 sz->_klass_bytes = sz->count(this); | |
| 657 sz->_mirror_bytes = sz->count(java_mirror()); | |
| 658 sz->_secondary_supers_bytes = sz->count_array(secondary_supers()); | |
| 659 | |
| 660 sz->_ro_bytes += sz->_secondary_supers_bytes; | |
| 661 sz->_rw_bytes += sz->_klass_bytes + sz->_mirror_bytes; | |
| 662 } | |
| 663 #endif // INCLUDE_SERVICES | |
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664 |
| 0 | 665 // Verification |
| 666 | |
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667 void Klass::verify_on(outputStream* st) { |
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668 |
| 11034 | 669 // This can be expensive, but it is worth checking that this klass is actually |
| 670 // in the CLD graph but not in production. | |
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671 assert(Metaspace::contains((address)this), "Should be"); |
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672 |
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673 guarantee(this->is_klass(),"should be klass"); |
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674 |
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675 if (super() != NULL) { |
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676 guarantee(super()->is_klass(), "should be klass"); |
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677 } |
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678 if (secondary_super_cache() != NULL) { |
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679 Klass* ko = secondary_super_cache(); |
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680 guarantee(ko->is_klass(), "should be klass"); |
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681 } |
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682 for ( uint i = 0; i < primary_super_limit(); i++ ) { |
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683 Klass* ko = _primary_supers[i]; |
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684 if (ko != NULL) { |
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685 guarantee(ko->is_klass(), "should be klass"); |
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686 } |
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687 } |
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688 |
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689 if (java_mirror() != NULL) { |
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690 guarantee(java_mirror()->is_oop(), "should be instance"); |
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691 } |
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692 } |
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693 |
| 0 | 694 void Klass::oop_verify_on(oop obj, outputStream* st) { |
| 695 guarantee(obj->is_oop(), "should be oop"); | |
| 696 guarantee(obj->klass()->is_klass(), "klass field is not a klass"); | |
| 697 } | |
| 698 | |
| 699 #ifndef PRODUCT | |
| 700 | |
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701 bool Klass::verify_vtable_index(int i) { |
| 0 | 702 if (oop_is_instance()) { |
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703 int limit = ((InstanceKlass*)this)->vtable_length()/vtableEntry::size(); |
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704 assert(i >= 0 && i < limit, err_msg("index %d out of bounds %d", i, limit)); |
| 0 | 705 } else { |
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706 assert(oop_is_array(), "Must be"); |
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707 int limit = ((ArrayKlass*)this)->vtable_length()/vtableEntry::size(); |
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708 assert(i >= 0 && i < limit, err_msg("index %d out of bounds %d", i, limit)); |
| 0 | 709 } |
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710 return true; |
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711 } |
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712 |
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713 bool Klass::verify_itable_index(int i) { |
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714 assert(oop_is_instance(), ""); |
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715 int method_count = klassItable::method_count_for_interface(this); |
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716 assert(i >= 0 && i < method_count, "index out of bounds"); |
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717 return true; |
| 0 | 718 } |
| 719 | |
| 720 #endif | |
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721 |
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722 /////////////// Unit tests /////////////// |
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723 |
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724 #ifndef PRODUCT |
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725 |
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726 class TestKlass { |
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727 public: |
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728 static void test_oop_is_instanceClassLoader() { |
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729 assert(SystemDictionary::ClassLoader_klass()->oop_is_instanceClassLoader(), "assert"); |
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730 assert(!SystemDictionary::String_klass()->oop_is_instanceClassLoader(), "assert"); |
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731 } |
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732 }; |
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733 |
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734 void TestKlass_test() { |
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735 TestKlass::test_oop_is_instanceClassLoader(); |
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736 } |
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737 |
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738 #endif |