src/share/vm/oops/klass.cpp

Tue, 15 Apr 2014 16:17:20 -0400

author
lfoltan
date
Tue, 15 Apr 2014 16:17:20 -0400
changeset 6818
096a7e12d63f
parent 5732
b2e698d2276c
child 6830
54bc75c144b0
permissions
-rw-r--r--

8036805: Correct linker method lookup.
Summary: Correct handling of array of primitive type qualifiers during field and method resolution.
Reviewed-by: acorn, hseigel, ahgross

duke@435 1 /*
lfoltan@6818 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
duke@435 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435 4 *
duke@435 5 * This code is free software; you can redistribute it and/or modify it
duke@435 6 * under the terms of the GNU General Public License version 2 only, as
duke@435 7 * published by the Free Software Foundation.
duke@435 8 *
duke@435 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@435 13 * accompanied this code).
duke@435 14 *
duke@435 15 * You should have received a copy of the GNU General Public License version
duke@435 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@435 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435 18 *
trims@1907 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907 20 * or visit www.oracle.com if you need additional information or have any
trims@1907 21 * questions.
duke@435 22 *
duke@435 23 */
duke@435 24
stefank@2314 25 #include "precompiled.hpp"
coleenp@4037 26 #include "classfile/javaClasses.hpp"
coleenp@4037 27 #include "classfile/dictionary.hpp"
stefank@2314 28 #include "classfile/systemDictionary.hpp"
stefank@2314 29 #include "classfile/vmSymbols.hpp"
coleenp@4037 30 #include "gc_implementation/shared/markSweep.inline.hpp"
stefank@2314 31 #include "gc_interface/collectedHeap.inline.hpp"
acorn@4497 32 #include "memory/heapInspection.hpp"
coleenp@4037 33 #include "memory/metadataFactory.hpp"
stefank@2314 34 #include "memory/oopFactory.hpp"
stefank@2314 35 #include "memory/resourceArea.hpp"
stefank@2314 36 #include "oops/instanceKlass.hpp"
stefank@2314 37 #include "oops/klass.inline.hpp"
stefank@2314 38 #include "oops/oop.inline2.hpp"
stefank@2314 39 #include "runtime/atomic.hpp"
sla@5237 40 #include "trace/traceMacros.hpp"
coleenp@4037 41 #include "utilities/stack.hpp"
jprovino@4542 42 #include "utilities/macros.hpp"
jprovino@4542 43 #if INCLUDE_ALL_GCS
coleenp@4037 44 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
coleenp@4037 45 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
coleenp@4037 46 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
jprovino@4542 47 #endif // INCLUDE_ALL_GCS
duke@435 48
coleenp@2497 49 void Klass::set_name(Symbol* n) {
coleenp@2497 50 _name = n;
coleenp@2497 51 if (_name != NULL) _name->increment_refcount();
coleenp@2497 52 }
duke@435 53
minqi@5097 54 bool Klass::is_subclass_of(const Klass* k) const {
duke@435 55 // Run up the super chain and check
coleenp@4037 56 if (this == k) return true;
duke@435 57
coleenp@4037 58 Klass* t = const_cast<Klass*>(this)->super();
duke@435 59
duke@435 60 while (t != NULL) {
duke@435 61 if (t == k) return true;
hseigel@4278 62 t = t->super();
duke@435 63 }
duke@435 64 return false;
duke@435 65 }
duke@435 66
coleenp@4037 67 bool Klass::search_secondary_supers(Klass* k) const {
duke@435 68 // Put some extra logic here out-of-line, before the search proper.
duke@435 69 // This cuts down the size of the inline method.
duke@435 70
duke@435 71 // This is necessary, since I am never in my own secondary_super list.
coleenp@4037 72 if (this == k)
duke@435 73 return true;
duke@435 74 // Scan the array-of-objects for a match
duke@435 75 int cnt = secondary_supers()->length();
duke@435 76 for (int i = 0; i < cnt; i++) {
coleenp@4037 77 if (secondary_supers()->at(i) == k) {
duke@435 78 ((Klass*)this)->set_secondary_super_cache(k);
duke@435 79 return true;
duke@435 80 }
duke@435 81 }
duke@435 82 return false;
duke@435 83 }
duke@435 84
duke@435 85 // Return self, except for abstract classes with exactly 1
duke@435 86 // implementor. Then return the 1 concrete implementation.
duke@435 87 Klass *Klass::up_cast_abstract() {
duke@435 88 Klass *r = this;
duke@435 89 while( r->is_abstract() ) { // Receiver is abstract?
duke@435 90 Klass *s = r->subklass(); // Check for exactly 1 subklass
duke@435 91 if( !s || s->next_sibling() ) // Oops; wrong count; give up
duke@435 92 return this; // Return 'this' as a no-progress flag
duke@435 93 r = s; // Loop till find concrete class
duke@435 94 }
duke@435 95 return r; // Return the 1 concrete class
duke@435 96 }
duke@435 97
twisti@1040 98 // Find LCA in class hierarchy
duke@435 99 Klass *Klass::LCA( Klass *k2 ) {
duke@435 100 Klass *k1 = this;
duke@435 101 while( 1 ) {
coleenp@4037 102 if( k1->is_subtype_of(k2) ) return k2;
coleenp@4037 103 if( k2->is_subtype_of(k1) ) return k1;
coleenp@4037 104 k1 = k1->super();
coleenp@4037 105 k2 = k2->super();
duke@435 106 }
duke@435 107 }
duke@435 108
duke@435 109
duke@435 110 void Klass::check_valid_for_instantiation(bool throwError, TRAPS) {
duke@435 111 ResourceMark rm(THREAD);
duke@435 112 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
duke@435 113 : vmSymbols::java_lang_InstantiationException(), external_name());
duke@435 114 }
duke@435 115
duke@435 116
duke@435 117 void Klass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) {
duke@435 118 THROW(vmSymbols::java_lang_ArrayStoreException());
duke@435 119 }
duke@435 120
duke@435 121
duke@435 122 void Klass::initialize(TRAPS) {
duke@435 123 ShouldNotReachHere();
duke@435 124 }
duke@435 125
coleenp@4037 126 bool Klass::compute_is_subtype_of(Klass* k) {
duke@435 127 assert(k->is_klass(), "argument must be a class");
duke@435 128 return is_subclass_of(k);
duke@435 129 }
duke@435 130
lfoltan@6818 131 Klass* Klass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
lfoltan@6818 132 #ifdef ASSERT
lfoltan@6818 133 tty->print_cr("Error: find_field called on a klass oop."
lfoltan@6818 134 " Likely error: reflection method does not correctly"
lfoltan@6818 135 " wrap return value in a mirror object.");
lfoltan@6818 136 #endif
lfoltan@6818 137 ShouldNotReachHere();
lfoltan@6818 138 return NULL;
lfoltan@6818 139 }
duke@435 140
coleenp@4037 141 Method* Klass::uncached_lookup_method(Symbol* name, Symbol* signature) const {
duke@435 142 #ifdef ASSERT
duke@435 143 tty->print_cr("Error: uncached_lookup_method called on a klass oop."
duke@435 144 " Likely error: reflection method does not correctly"
duke@435 145 " wrap return value in a mirror object.");
duke@435 146 #endif
duke@435 147 ShouldNotReachHere();
duke@435 148 return NULL;
duke@435 149 }
duke@435 150
coleenp@5614 151 void* Klass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) throw() {
coleenp@4037 152 return Metaspace::allocate(loader_data, word_size, /*read_only*/false,
iklam@5208 153 MetaspaceObj::ClassType, CHECK_NULL);
coleenp@4037 154 }
coleenp@4037 155
coleenp@4037 156 Klass::Klass() {
coleenp@4037 157 Klass* k = this;
duke@435 158
coleenp@4712 159 // Preinitialize supertype information.
coleenp@4712 160 // A later call to initialize_supers() may update these settings:
coleenp@4712 161 set_super(NULL);
coleenp@4712 162 for (juint i = 0; i < Klass::primary_super_limit(); i++) {
coleenp@4712 163 _primary_supers[i] = NULL;
duke@435 164 }
coleenp@4712 165 set_secondary_supers(NULL);
coleenp@4712 166 set_secondary_super_cache(NULL);
coleenp@4712 167 _primary_supers[0] = k;
coleenp@4712 168 set_super_check_offset(in_bytes(primary_supers_offset()));
duke@435 169
coleenp@4037 170 set_java_mirror(NULL);
coleenp@4037 171 set_modifier_flags(0);
coleenp@4037 172 set_layout_helper(Klass::_lh_neutral_value);
coleenp@4037 173 set_name(NULL);
duke@435 174 AccessFlags af;
duke@435 175 af.set_flags(0);
coleenp@4037 176 set_access_flags(af);
coleenp@4037 177 set_subklass(NULL);
coleenp@4037 178 set_next_sibling(NULL);
coleenp@4037 179 set_next_link(NULL);
sla@5237 180 TRACE_INIT_ID(this);
duke@435 181
coleenp@4037 182 set_prototype_header(markOopDesc::prototype());
coleenp@4037 183 set_biased_lock_revocation_count(0);
coleenp@4037 184 set_last_biased_lock_bulk_revocation_time(0);
duke@435 185
coleenp@4037 186 // The klass doesn't have any references at this point.
coleenp@4037 187 clear_modified_oops();
coleenp@4037 188 clear_accumulated_modified_oops();
duke@435 189 }
duke@435 190
duke@435 191 jint Klass::array_layout_helper(BasicType etype) {
duke@435 192 assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype");
duke@435 193 // Note that T_ARRAY is not allowed here.
duke@435 194 int hsize = arrayOopDesc::base_offset_in_bytes(etype);
kvn@464 195 int esize = type2aelembytes(etype);
duke@435 196 bool isobj = (etype == T_OBJECT);
duke@435 197 int tag = isobj ? _lh_array_tag_obj_value : _lh_array_tag_type_value;
duke@435 198 int lh = array_layout_helper(tag, hsize, etype, exact_log2(esize));
duke@435 199
duke@435 200 assert(lh < (int)_lh_neutral_value, "must look like an array layout");
coleenp@4037 201 assert(layout_helper_is_array(lh), "correct kind");
duke@435 202 assert(layout_helper_is_objArray(lh) == isobj, "correct kind");
duke@435 203 assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind");
duke@435 204 assert(layout_helper_header_size(lh) == hsize, "correct decode");
duke@435 205 assert(layout_helper_element_type(lh) == etype, "correct decode");
duke@435 206 assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode");
duke@435 207
duke@435 208 return lh;
duke@435 209 }
duke@435 210
duke@435 211 bool Klass::can_be_primary_super_slow() const {
duke@435 212 if (super() == NULL)
duke@435 213 return true;
coleenp@4037 214 else if (super()->super_depth() >= primary_super_limit()-1)
duke@435 215 return false;
duke@435 216 else
duke@435 217 return true;
duke@435 218 }
duke@435 219
coleenp@4037 220 void Klass::initialize_supers(Klass* k, TRAPS) {
duke@435 221 if (FastSuperclassLimit == 0) {
duke@435 222 // None of the other machinery matters.
duke@435 223 set_super(k);
duke@435 224 return;
duke@435 225 }
duke@435 226 if (k == NULL) {
duke@435 227 set_super(NULL);
coleenp@4037 228 _primary_supers[0] = this;
duke@435 229 assert(super_depth() == 0, "Object must already be initialized properly");
never@1577 230 } else if (k != super() || k == SystemDictionary::Object_klass()) {
never@1577 231 assert(super() == NULL || super() == SystemDictionary::Object_klass(),
duke@435 232 "initialize this only once to a non-trivial value");
duke@435 233 set_super(k);
coleenp@4037 234 Klass* sup = k;
duke@435 235 int sup_depth = sup->super_depth();
duke@435 236 juint my_depth = MIN2(sup_depth + 1, (int)primary_super_limit());
duke@435 237 if (!can_be_primary_super_slow())
duke@435 238 my_depth = primary_super_limit();
duke@435 239 for (juint i = 0; i < my_depth; i++) {
coleenp@4037 240 _primary_supers[i] = sup->_primary_supers[i];
duke@435 241 }
coleenp@4037 242 Klass* *super_check_cell;
duke@435 243 if (my_depth < primary_super_limit()) {
coleenp@4037 244 _primary_supers[my_depth] = this;
duke@435 245 super_check_cell = &_primary_supers[my_depth];
duke@435 246 } else {
duke@435 247 // Overflow of the primary_supers array forces me to be secondary.
duke@435 248 super_check_cell = &_secondary_super_cache;
duke@435 249 }
coleenp@4037 250 set_super_check_offset((address)super_check_cell - (address) this);
duke@435 251
duke@435 252 #ifdef ASSERT
duke@435 253 {
duke@435 254 juint j = super_depth();
duke@435 255 assert(j == my_depth, "computed accessor gets right answer");
coleenp@4037 256 Klass* t = this;
hseigel@4278 257 while (!t->can_be_primary_super()) {
hseigel@4278 258 t = t->super();
hseigel@4278 259 j = t->super_depth();
duke@435 260 }
duke@435 261 for (juint j1 = j+1; j1 < primary_super_limit(); j1++) {
duke@435 262 assert(primary_super_of_depth(j1) == NULL, "super list padding");
duke@435 263 }
duke@435 264 while (t != NULL) {
duke@435 265 assert(primary_super_of_depth(j) == t, "super list initialization");
hseigel@4278 266 t = t->super();
duke@435 267 --j;
duke@435 268 }
duke@435 269 assert(j == (juint)-1, "correct depth count");
duke@435 270 }
duke@435 271 #endif
duke@435 272 }
duke@435 273
duke@435 274 if (secondary_supers() == NULL) {
duke@435 275 KlassHandle this_kh (THREAD, this);
duke@435 276
duke@435 277 // Now compute the list of secondary supertypes.
duke@435 278 // Secondaries can occasionally be on the super chain,
duke@435 279 // if the inline "_primary_supers" array overflows.
duke@435 280 int extras = 0;
coleenp@4037 281 Klass* p;
coleenp@4037 282 for (p = super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) {
duke@435 283 ++extras;
duke@435 284 }
duke@435 285
coleenp@4037 286 ResourceMark rm(THREAD); // need to reclaim GrowableArrays allocated below
coleenp@4037 287
duke@435 288 // Compute the "real" non-extra secondaries.
coleenp@4037 289 GrowableArray<Klass*>* secondaries = compute_secondary_supers(extras);
coleenp@4037 290 if (secondaries == NULL) {
coleenp@4037 291 // secondary_supers set by compute_secondary_supers
coleenp@4037 292 return;
coleenp@4037 293 }
duke@435 294
coleenp@4037 295 GrowableArray<Klass*>* primaries = new GrowableArray<Klass*>(extras);
coleenp@4037 296
coleenp@4037 297 for (p = this_kh->super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) {
duke@435 298 int i; // Scan for overflow primaries being duplicates of 2nd'arys
duke@435 299
duke@435 300 // This happens frequently for very deeply nested arrays: the
duke@435 301 // primary superclass chain overflows into the secondary. The
duke@435 302 // secondary list contains the element_klass's secondaries with
duke@435 303 // an extra array dimension added. If the element_klass's
duke@435 304 // secondary list already contains some primary overflows, they
duke@435 305 // (with the extra level of array-ness) will collide with the
duke@435 306 // normal primary superclass overflows.
coleenp@4037 307 for( i = 0; i < secondaries->length(); i++ ) {
coleenp@4037 308 if( secondaries->at(i) == p )
duke@435 309 break;
coleenp@4037 310 }
duke@435 311 if( i < secondaries->length() )
duke@435 312 continue; // It's a dup, don't put it in
coleenp@4037 313 primaries->push(p);
duke@435 314 }
coleenp@4037 315 // Combine the two arrays into a metadata object to pack the array.
coleenp@4037 316 // The primaries are added in the reverse order, then the secondaries.
coleenp@4037 317 int new_length = primaries->length() + secondaries->length();
coleenp@4037 318 Array<Klass*>* s2 = MetadataFactory::new_array<Klass*>(
coleenp@4037 319 class_loader_data(), new_length, CHECK);
coleenp@4037 320 int fill_p = primaries->length();
coleenp@4037 321 for (int j = 0; j < fill_p; j++) {
coleenp@4037 322 s2->at_put(j, primaries->pop()); // add primaries in reverse order.
coleenp@4037 323 }
coleenp@4037 324 for( int j = 0; j < secondaries->length(); j++ ) {
coleenp@4037 325 s2->at_put(j+fill_p, secondaries->at(j)); // add secondaries on the end.
duke@435 326 }
duke@435 327
duke@435 328 #ifdef ASSERT
duke@435 329 // We must not copy any NULL placeholders left over from bootstrap.
coleenp@4037 330 for (int j = 0; j < s2->length(); j++) {
coleenp@4037 331 assert(s2->at(j) != NULL, "correct bootstrapping order");
duke@435 332 }
duke@435 333 #endif
duke@435 334
coleenp@4037 335 this_kh->set_secondary_supers(s2);
duke@435 336 }
duke@435 337 }
duke@435 338
coleenp@4037 339 GrowableArray<Klass*>* Klass::compute_secondary_supers(int num_extra_slots) {
duke@435 340 assert(num_extra_slots == 0, "override for complex klasses");
coleenp@4037 341 set_secondary_supers(Universe::the_empty_klass_array());
coleenp@4037 342 return NULL;
duke@435 343 }
duke@435 344
duke@435 345
duke@435 346 Klass* Klass::subklass() const {
hseigel@4278 347 return _subklass == NULL ? NULL : _subklass;
duke@435 348 }
duke@435 349
coleenp@4037 350 InstanceKlass* Klass::superklass() const {
coleenp@4037 351 assert(super() == NULL || super()->oop_is_instance(), "must be instance klass");
coleenp@4037 352 return _super == NULL ? NULL : InstanceKlass::cast(_super);
duke@435 353 }
duke@435 354
duke@435 355 Klass* Klass::next_sibling() const {
hseigel@4278 356 return _next_sibling == NULL ? NULL : _next_sibling;
duke@435 357 }
duke@435 358
coleenp@4037 359 void Klass::set_subklass(Klass* s) {
coleenp@4037 360 assert(s != this, "sanity check");
coleenp@4037 361 _subklass = s;
duke@435 362 }
duke@435 363
coleenp@4037 364 void Klass::set_next_sibling(Klass* s) {
coleenp@4037 365 assert(s != this, "sanity check");
coleenp@4037 366 _next_sibling = s;
duke@435 367 }
duke@435 368
duke@435 369 void Klass::append_to_sibling_list() {
coleenp@4178 370 debug_only(verify();)
duke@435 371 // add ourselves to superklass' subklass list
coleenp@4037 372 InstanceKlass* super = superklass();
duke@435 373 if (super == NULL) return; // special case: class Object
coleenp@4178 374 assert((!super->is_interface() // interfaces cannot be supers
duke@435 375 && (super->superklass() == NULL || !is_interface())),
duke@435 376 "an interface can only be a subklass of Object");
coleenp@4037 377 Klass* prev_first_subklass = super->subklass_oop();
duke@435 378 if (prev_first_subklass != NULL) {
duke@435 379 // set our sibling to be the superklass' previous first subklass
duke@435 380 set_next_sibling(prev_first_subklass);
duke@435 381 }
duke@435 382 // make ourselves the superklass' first subklass
coleenp@4037 383 super->set_subklass(this);
coleenp@4178 384 debug_only(verify();)
duke@435 385 }
duke@435 386
coleenp@4037 387 bool Klass::is_loader_alive(BoolObjectClosure* is_alive) {
coleenp@4037 388 assert(ClassLoaderDataGraph::contains((address)this), "is in the metaspace");
coleenp@4304 389
coleenp@4304 390 #ifdef ASSERT
coleenp@4037 391 // The class is alive iff the class loader is alive.
coleenp@4037 392 oop loader = class_loader();
coleenp@4304 393 bool loader_alive = (loader == NULL) || is_alive->do_object_b(loader);
coleenp@4304 394 #endif // ASSERT
coleenp@4304 395
coleenp@4304 396 // The class is alive if it's mirror is alive (which should be marked if the
coleenp@4304 397 // loader is alive) unless it's an anoymous class.
coleenp@4304 398 bool mirror_alive = is_alive->do_object_b(java_mirror());
coleenp@4304 399 assert(!mirror_alive || loader_alive, "loader must be alive if the mirror is"
coleenp@4304 400 " but not the other way around with anonymous classes");
coleenp@4304 401 return mirror_alive;
coleenp@4037 402 }
coleenp@4037 403
coleenp@4037 404 void Klass::clean_weak_klass_links(BoolObjectClosure* is_alive) {
coleenp@4037 405 if (!ClassUnloading) {
coleenp@4037 406 return;
coleenp@4037 407 }
coleenp@4037 408
coleenp@4037 409 Klass* root = SystemDictionary::Object_klass();
coleenp@4037 410 Stack<Klass*, mtGC> stack;
coleenp@4037 411
coleenp@4037 412 stack.push(root);
coleenp@4037 413 while (!stack.is_empty()) {
coleenp@4037 414 Klass* current = stack.pop();
coleenp@4037 415
coleenp@4037 416 assert(current->is_loader_alive(is_alive), "just checking, this should be live");
coleenp@4037 417
coleenp@4037 418 // Find and set the first alive subklass
coleenp@4037 419 Klass* sub = current->subklass_oop();
coleenp@4037 420 while (sub != NULL && !sub->is_loader_alive(is_alive)) {
duke@435 421 #ifndef PRODUCT
coleenp@4304 422 if (TraceClassUnloading && WizardMode) {
coleenp@4304 423 ResourceMark rm;
coleenp@4037 424 tty->print_cr("[Unlinking class (subclass) %s]", sub->external_name());
coleenp@4304 425 }
duke@435 426 #endif
coleenp@4037 427 sub = sub->next_sibling_oop();
duke@435 428 }
coleenp@4037 429 current->set_subklass(sub);
coleenp@4037 430 if (sub != NULL) {
coleenp@4037 431 stack.push(sub);
coleenp@4037 432 }
coleenp@4037 433
coleenp@4037 434 // Find and set the first alive sibling
coleenp@4037 435 Klass* sibling = current->next_sibling_oop();
coleenp@4037 436 while (sibling != NULL && !sibling->is_loader_alive(is_alive)) {
coleenp@4304 437 if (TraceClassUnloading && WizardMode) {
coleenp@4304 438 ResourceMark rm;
coleenp@4037 439 tty->print_cr("[Unlinking class (sibling) %s]", sibling->external_name());
coleenp@4304 440 }
coleenp@4037 441 sibling = sibling->next_sibling_oop();
coleenp@4304 442 }
coleenp@4037 443 current->set_next_sibling(sibling);
coleenp@4037 444 if (sibling != NULL) {
coleenp@4037 445 stack.push(sibling);
coleenp@4304 446 }
coleenp@4037 447
coleenp@4037 448 // Clean the implementors list and method data.
coleenp@4037 449 if (current->oop_is_instance()) {
coleenp@4037 450 InstanceKlass* ik = InstanceKlass::cast(current);
coleenp@4037 451 ik->clean_implementors_list(is_alive);
coleenp@4037 452 ik->clean_method_data(is_alive);
duke@435 453 }
duke@435 454 }
duke@435 455 }
duke@435 456
coleenp@4037 457 void Klass::klass_update_barrier_set(oop v) {
coleenp@4037 458 record_modified_oops();
coleenp@4037 459 }
coleenp@4037 460
coleenp@4037 461 void Klass::klass_update_barrier_set_pre(void* p, oop v) {
coleenp@4037 462 // This barrier used by G1, where it's used remember the old oop values,
coleenp@4037 463 // so that we don't forget any objects that were live at the snapshot at
coleenp@4037 464 // the beginning. This function is only used when we write oops into
coleenp@4037 465 // Klasses. Since the Klasses are used as roots in G1, we don't have to
coleenp@4037 466 // do anything here.
coleenp@4037 467 }
coleenp@4037 468
coleenp@4037 469 void Klass::klass_oop_store(oop* p, oop v) {
coleenp@4037 470 assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata");
coleenp@4037 471 assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object");
coleenp@4037 472
coleenp@4037 473 // do the store
coleenp@4037 474 if (always_do_update_barrier) {
coleenp@4037 475 klass_oop_store((volatile oop*)p, v);
coleenp@4037 476 } else {
coleenp@4037 477 klass_update_barrier_set_pre((void*)p, v);
coleenp@4037 478 *p = v;
coleenp@4037 479 klass_update_barrier_set(v);
coleenp@4037 480 }
coleenp@4037 481 }
coleenp@4037 482
coleenp@4037 483 void Klass::klass_oop_store(volatile oop* p, oop v) {
coleenp@4037 484 assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata");
coleenp@4037 485 assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object");
coleenp@4037 486
coleenp@4037 487 klass_update_barrier_set_pre((void*)p, v);
coleenp@4037 488 OrderAccess::release_store_ptr(p, v);
coleenp@4037 489 klass_update_barrier_set(v);
coleenp@4037 490 }
coleenp@4037 491
coleenp@4037 492 void Klass::oops_do(OopClosure* cl) {
coleenp@4037 493 cl->do_oop(&_java_mirror);
coleenp@4037 494 }
duke@435 495
duke@435 496 void Klass::remove_unshareable_info() {
coleenp@4751 497 if (!DumpSharedSpaces) {
coleenp@4751 498 // Clean up after OOM during class loading
coleenp@4751 499 if (class_loader_data() != NULL) {
coleenp@4751 500 class_loader_data()->remove_class(this);
coleenp@4751 501 }
coleenp@4751 502 }
duke@435 503 set_subklass(NULL);
duke@435 504 set_next_sibling(NULL);
coleenp@4037 505 // Clear the java mirror
coleenp@4037 506 set_java_mirror(NULL);
coleenp@4037 507 set_next_link(NULL);
coleenp@4037 508
coleenp@4037 509 // Null out class_loader_data because we don't share that yet.
coleenp@4037 510 set_class_loader_data(NULL);
duke@435 511 }
duke@435 512
coleenp@4037 513 void Klass::restore_unshareable_info(TRAPS) {
coleenp@4037 514 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
coleenp@4037 515 // Restore class_loader_data to the null class loader data
coleenp@4037 516 set_class_loader_data(loader_data);
duke@435 517
coleenp@4037 518 // Add to null class loader list first before creating the mirror
coleenp@4037 519 // (same order as class file parsing)
coleenp@4037 520 loader_data->add_class(this);
coleenp@4037 521
coleenp@5176 522 // Recreate the class mirror. The protection_domain is always null for
coleenp@5176 523 // boot loader, for now.
coleenp@5176 524 java_lang_Class::create_mirror(this, Handle(NULL), CHECK);
coleenp@2497 525 }
coleenp@2497 526
coleenp@4037 527 Klass* Klass::array_klass_or_null(int rank) {
duke@435 528 EXCEPTION_MARK;
duke@435 529 // No exception can be thrown by array_klass_impl when called with or_null == true.
duke@435 530 // (In anycase, the execption mark will fail if it do so)
duke@435 531 return array_klass_impl(true, rank, THREAD);
duke@435 532 }
duke@435 533
duke@435 534
coleenp@4037 535 Klass* Klass::array_klass_or_null() {
duke@435 536 EXCEPTION_MARK;
duke@435 537 // No exception can be thrown by array_klass_impl when called with or_null == true.
duke@435 538 // (In anycase, the execption mark will fail if it do so)
duke@435 539 return array_klass_impl(true, THREAD);
duke@435 540 }
duke@435 541
duke@435 542
coleenp@4037 543 Klass* Klass::array_klass_impl(bool or_null, int rank, TRAPS) {
coleenp@4142 544 fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass");
duke@435 545 return NULL;
duke@435 546 }
duke@435 547
duke@435 548
coleenp@4037 549 Klass* Klass::array_klass_impl(bool or_null, TRAPS) {
coleenp@4142 550 fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass");
duke@435 551 return NULL;
duke@435 552 }
duke@435 553
coleenp@4037 554 oop Klass::class_loader() const { return class_loader_data()->class_loader(); }
coleenp@4037 555
duke@435 556 const char* Klass::external_name() const {
jrose@866 557 if (oop_is_instance()) {
coleenp@4037 558 InstanceKlass* ik = (InstanceKlass*) this;
jrose@866 559 if (ik->is_anonymous()) {
twisti@2698 560 assert(EnableInvokeDynamic, "");
coleenp@4304 561 intptr_t hash = 0;
coleenp@4304 562 if (ik->java_mirror() != NULL) {
coleenp@4304 563 // java_mirror might not be created yet, return 0 as hash.
coleenp@4304 564 hash = ik->java_mirror()->identity_hash();
coleenp@4304 565 }
jrose@866 566 char hash_buf[40];
jrose@866 567 sprintf(hash_buf, "/" UINTX_FORMAT, (uintx)hash);
jrose@866 568 size_t hash_len = strlen(hash_buf);
jrose@866 569
jrose@866 570 size_t result_len = name()->utf8_length();
jrose@866 571 char* result = NEW_RESOURCE_ARRAY(char, result_len + hash_len + 1);
jrose@866 572 name()->as_klass_external_name(result, (int) result_len + 1);
jrose@866 573 assert(strlen(result) == result_len, "");
jrose@866 574 strcpy(result + result_len, hash_buf);
jrose@866 575 assert(strlen(result) == result_len + hash_len, "");
jrose@866 576 return result;
jrose@866 577 }
jrose@866 578 }
jrose@1474 579 if (name() == NULL) return "<unknown>";
duke@435 580 return name()->as_klass_external_name();
duke@435 581 }
duke@435 582
duke@435 583
jrose@1474 584 const char* Klass::signature_name() const {
jrose@1474 585 if (name() == NULL) return "<unknown>";
duke@435 586 return name()->as_C_string();
duke@435 587 }
duke@435 588
duke@435 589 // Unless overridden, modifier_flags is 0.
duke@435 590 jint Klass::compute_modifier_flags(TRAPS) const {
duke@435 591 return 0;
duke@435 592 }
duke@435 593
duke@435 594 int Klass::atomic_incr_biased_lock_revocation_count() {
duke@435 595 return (int) Atomic::add(1, &_biased_lock_revocation_count);
duke@435 596 }
duke@435 597
duke@435 598 // Unless overridden, jvmti_class_status has no flags set.
duke@435 599 jint Klass::jvmti_class_status() const {
duke@435 600 return 0;
duke@435 601 }
duke@435 602
coleenp@4037 603
duke@435 604 // Printing
duke@435 605
coleenp@4037 606 void Klass::print_on(outputStream* st) const {
coleenp@4037 607 ResourceMark rm;
coleenp@4037 608 // print title
coleenp@4037 609 st->print("%s", internal_name());
coleenp@4037 610 print_address_on(st);
coleenp@4037 611 st->cr();
coleenp@4037 612 }
coleenp@4037 613
duke@435 614 void Klass::oop_print_on(oop obj, outputStream* st) {
duke@435 615 ResourceMark rm;
duke@435 616 // print title
duke@435 617 st->print_cr("%s ", internal_name());
duke@435 618 obj->print_address_on(st);
duke@435 619
duke@435 620 if (WizardMode) {
duke@435 621 // print header
duke@435 622 obj->mark()->print_on(st);
duke@435 623 }
duke@435 624
duke@435 625 // print class
duke@435 626 st->print(" - klass: ");
duke@435 627 obj->klass()->print_value_on(st);
duke@435 628 st->cr();
duke@435 629 }
duke@435 630
duke@435 631 void Klass::oop_print_value_on(oop obj, outputStream* st) {
duke@435 632 // print title
duke@435 633 ResourceMark rm; // Cannot print in debug mode without this
duke@435 634 st->print("%s", internal_name());
duke@435 635 obj->print_address_on(st);
duke@435 636 }
duke@435 637
acorn@4497 638 #if INCLUDE_SERVICES
acorn@4497 639 // Size Statistics
acorn@4497 640 void Klass::collect_statistics(KlassSizeStats *sz) const {
acorn@4497 641 sz->_klass_bytes = sz->count(this);
acorn@4497 642 sz->_mirror_bytes = sz->count(java_mirror());
acorn@4497 643 sz->_secondary_supers_bytes = sz->count_array(secondary_supers());
acorn@4497 644
acorn@4497 645 sz->_ro_bytes += sz->_secondary_supers_bytes;
acorn@4497 646 sz->_rw_bytes += sz->_klass_bytes + sz->_mirror_bytes;
acorn@4497 647 }
acorn@4497 648 #endif // INCLUDE_SERVICES
coleenp@4037 649
duke@435 650 // Verification
duke@435 651
coleenp@5307 652 void Klass::verify_on(outputStream* st, bool check_dictionary) {
coleenp@4037 653
coleenp@5307 654 // This can be expensive, but it is worth checking that this klass is actually
coleenp@5307 655 // in the CLD graph but not in production.
coleenp@4037 656 assert(ClassLoaderDataGraph::contains((address)this), "Should be");
coleenp@4037 657
coleenp@4037 658 guarantee(this->is_klass(),"should be klass");
coleenp@4037 659
coleenp@4037 660 if (super() != NULL) {
coleenp@4037 661 guarantee(super()->is_klass(), "should be klass");
coleenp@4037 662 }
coleenp@4037 663 if (secondary_super_cache() != NULL) {
coleenp@4037 664 Klass* ko = secondary_super_cache();
coleenp@4037 665 guarantee(ko->is_klass(), "should be klass");
coleenp@4037 666 }
coleenp@4037 667 for ( uint i = 0; i < primary_super_limit(); i++ ) {
coleenp@4037 668 Klass* ko = _primary_supers[i];
coleenp@4037 669 if (ko != NULL) {
coleenp@4037 670 guarantee(ko->is_klass(), "should be klass");
coleenp@4037 671 }
coleenp@4037 672 }
coleenp@4037 673
coleenp@4037 674 if (java_mirror() != NULL) {
coleenp@4037 675 guarantee(java_mirror()->is_oop(), "should be instance");
coleenp@4037 676 }
coleenp@4037 677 }
coleenp@4037 678
duke@435 679 void Klass::oop_verify_on(oop obj, outputStream* st) {
duke@435 680 guarantee(obj->is_oop(), "should be oop");
duke@435 681 guarantee(obj->klass()->is_klass(), "klass field is not a klass");
duke@435 682 }
duke@435 683
duke@435 684 #ifndef PRODUCT
duke@435 685
drchase@5732 686 bool Klass::verify_vtable_index(int i) {
duke@435 687 if (oop_is_instance()) {
drchase@5732 688 int limit = ((InstanceKlass*)this)->vtable_length()/vtableEntry::size();
drchase@5732 689 assert(i >= 0 && i < limit, err_msg("index %d out of bounds %d", i, limit));
duke@435 690 } else {
coleenp@4037 691 assert(oop_is_array(), "Must be");
drchase@5732 692 int limit = ((ArrayKlass*)this)->vtable_length()/vtableEntry::size();
drchase@5732 693 assert(i >= 0 && i < limit, err_msg("index %d out of bounds %d", i, limit));
duke@435 694 }
drchase@5732 695 return true;
drchase@5732 696 }
drchase@5732 697
drchase@5732 698 bool Klass::verify_itable_index(int i) {
drchase@5732 699 assert(oop_is_instance(), "");
drchase@5732 700 int method_count = klassItable::method_count_for_interface(this);
drchase@5732 701 assert(i >= 0 && i < method_count, "index out of bounds");
drchase@5732 702 return true;
duke@435 703 }
duke@435 704
duke@435 705 #endif

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