1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/metadataOnStackMark.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/heapInspection.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "oops/constantPool.hpp"
37 #include "oops/instanceKlass.hpp"
38 #include "oops/objArrayKlass.hpp"
39 #include "oops/objArrayOop.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "runtime/fieldType.hpp"
42 #include "runtime/init.hpp"
43 #include "runtime/javaCalls.hpp"
44 #include "runtime/signature.hpp"
45 #include "runtime/vframe.hpp"
46 #include "utilities/copy.hpp"
47
48 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
49 // Tags are RW but comment below applies to tags also.
50 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
51
52 int size = ConstantPool::size(length);
53
54 // CDS considerations:
55 // Allocate read-write but may be able to move to read-only at dumping time
56 // if all the klasses are resolved. The only other field that is writable is
57 // the resolved_references array, which is recreated at startup time.
58 // But that could be moved to InstanceKlass (although a pain to access from
59 // assembly code). Maybe it could be moved to the cpCache which is RW.
60 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
61 }
62
63 #ifdef ASSERT
64
65 // MetaspaceObj allocation invariant is calloc equivalent memory
66 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
67 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
68 assert(tags != NULL, "invariant");
69 const int length = tags->length();
70 for (int index = 0; index < length; ++index) {
71 if (JVM_CONSTANT_Invalid != tags->at(index)) {
72 return false;
73 }
74 }
75 return true;
76 }
77
78 #endif
79
80 ConstantPool::ConstantPool(Array<u1>* tags) :
81 _tags(tags),
82 _length(tags->length()) {
83
84 assert(_tags != NULL, "invariant");
85 assert(tags->length() == _length, "invariant");
86 assert(tag_array_is_zero_initialized(tags), "invariant");
87 assert(0 == _flags, "invariant");
88 assert(0 == version(), "invariant");
89 assert(NULL == _pool_holder, "invariant");
90 }
91
92 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
93 MetadataFactory::free_metadata(loader_data, cache());
94 set_cache(NULL);
95 MetadataFactory::free_array<u2>(loader_data, reference_map());
96 set_reference_map(NULL);
97
98 MetadataFactory::free_array<jushort>(loader_data, operands());
99 set_operands(NULL);
100
101 release_C_heap_structures();
102
103 // free tag array
104 MetadataFactory::free_array<u1>(loader_data, tags());
105 set_tags(NULL);
106 }
107
108 void ConstantPool::release_C_heap_structures() {
109 // walk constant pool and decrement symbol reference counts
110 unreference_symbols();
111 }
112
113 objArrayOop ConstantPool::resolved_references() const {
114 return (objArrayOop)JNIHandles::resolve(_resolved_references);
115 }
116
117 // Create resolved_references array and mapping array for original cp indexes
118 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
119 // to map it back for resolving and some unlikely miscellaneous uses.
120 // The objects created by invokedynamic are appended to this list.
121 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
122 const intStack& reference_map,
123 int constant_pool_map_length,
124 TRAPS) {
125 // Initialized the resolved object cache.
126 int map_length = reference_map.length();
127 if (map_length > 0) {
128 // Only need mapping back to constant pool entries. The map isn't used for
129 // invokedynamic resolved_reference entries. For invokedynamic entries,
130 // the constant pool cache index has the mapping back to both the constant
131 // pool and to the resolved reference index.
132 if (constant_pool_map_length > 0) {
133 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
134
135 for (int i = 0; i < constant_pool_map_length; i++) {
136 int x = reference_map.at(i);
137 assert(x == (int)(jushort) x, "klass index is too big");
138 om->at_put(i, (jushort)x);
139 }
140 set_reference_map(om);
141 }
142
143 // Create Java array for holding resolved strings, methodHandles,
144 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
145 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
146 Handle refs_handle (THREAD, (oop)stom); // must handleize.
147 set_resolved_references(loader_data->add_handle(refs_handle));
148 }
149 }
150
151 // CDS support. Create a new resolved_references array.
152 void ConstantPool::restore_unshareable_info(TRAPS) {
153
154 // Only create the new resolved references array if it hasn't been attempted before
155 if (resolved_references() != NULL) return;
156
157 // restore the C++ vtable from the shared archive
158 restore_vtable();
159
160 if (SystemDictionary::Object_klass_loaded()) {
161 // Recreate the object array and add to ClassLoaderData.
162 int map_length = resolved_reference_length();
163 if (map_length > 0) {
164 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
165 Handle refs_handle (THREAD, (oop)stom); // must handleize.
166
167 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
168 set_resolved_references(loader_data->add_handle(refs_handle));
169 }
170 }
171 }
172
173 void ConstantPool::remove_unshareable_info() {
174 // Resolved references are not in the shared archive.
175 // Save the length for restoration. It is not necessarily the same length
176 // as reference_map.length() if invokedynamic is saved.
177 set_resolved_reference_length(
178 resolved_references() != NULL ? resolved_references()->length() : 0);
179 set_resolved_references(NULL);
180 }
181
182 int ConstantPool::cp_to_object_index(int cp_index) {
183 // this is harder don't do this so much.
184 int i = reference_map()->find(cp_index);
185 // We might not find the index for jsr292 call.
186 return (i < 0) ? _no_index_sentinel : i;
187 }
188
189 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
190 resolved_references()->obj_at_put(obj_index, str);
191 }
192
193 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, KlassHandle k) {
194 ResourceMark rm;
195 int line_number = -1;
196 const char * source_file = NULL;
197 if (JavaThread::current()->has_last_Java_frame()) {
198 // try to identify the method which called this function.
199 vframeStream vfst(JavaThread::current());
200 if (!vfst.at_end()) {
201 line_number = vfst.method()->line_number_from_bci(vfst.bci());
202 Symbol* s = vfst.method()->method_holder()->source_file_name();
203 if (s != NULL) {
204 source_file = s->as_C_string();
205 }
206 }
207 }
208 if (k() != this_cp->pool_holder()) {
209 // only print something if the classes are different
210 if (source_file != NULL) {
211 log_info(classresolve)("%s %s %s:%d",
212 this_cp->pool_holder()->external_name(),
213 k->external_name(), source_file, line_number);
214 } else {
215 log_info(classresolve)("%s %s",
216 this_cp->pool_holder()->external_name(),
217 k->external_name());
218 }
219 }
220 }
221
222 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
223 bool save_resolution_error, TRAPS) {
224 //assert(THREAD->is_Java_thread(), "must be a Java thread");
225 // TODO re-enable this assert as soon as we have a better solution
226 // With ValueTypePassFieldsAsArgs, we need to resolve call sites from the GC thread
227 // to determine the callee signature in nmethod::preserve_callee_argument_oops().
228 assert(ValueTypePassFieldsAsArgs || THREAD->is_Java_thread(), "must be a Java thread");
229
230 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
231 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
232 // the entry and tag is not updated atomicly.
233 CPSlot entry = this_cp->slot_at(which);
234 if (entry.is_resolved()) {
235 assert(entry.get_klass()->is_klass(), "must be");
236 // Already resolved - return entry.
237 return entry.get_klass();
238 }
239
240 // This tag doesn't change back to unresolved class unless at a safepoint.
241 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
242 // The original attempt to resolve this constant pool entry failed so find the
243 // class of the original error and throw another error of the same class
244 // (JVMS 5.4.3).
245 // If there is a detail message, pass that detail message to the error.
246 // The JVMS does not strictly require us to duplicate the same detail message,
247 // or any internal exception fields such as cause or stacktrace. But since the
248 // detail message is often a class name or other literal string, we will repeat it
249 // if we can find it in the symbol table.
250 throw_resolution_error(this_cp, which, CHECK_0);
251 ShouldNotReachHere();
252 }
253
254 Handle mirror_handle;
255 Symbol* name = entry.get_symbol();
256 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
257 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
258 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
259 KlassHandle k (THREAD, kk);
260 if (!HAS_PENDING_EXCEPTION) {
261 // preserve the resolved klass from unloading
262 mirror_handle = Handle(THREAD, kk->java_mirror());
263 // Do access check for klasses
264 verify_constant_pool_resolve(this_cp, k, THREAD);
265 }
266
267 // Failed to resolve class. We must record the errors so that subsequent attempts
268 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
269 if (HAS_PENDING_EXCEPTION) {
270 if (save_resolution_error) {
271 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
272 // If CHECK_NULL above doesn't return the exception, that means that
273 // some other thread has beaten us and has resolved the class.
274 // To preserve old behavior, we return the resolved class.
275 entry = this_cp->resolved_klass_at(which);
276 assert(entry.is_resolved(), "must be resolved if exception was cleared");
277 assert(entry.get_klass()->is_klass(), "must be resolved to a klass");
278 return entry.get_klass();
279 } else {
280 return NULL; // return the pending exception
281 }
282 }
283
284 // Make this class loader depend upon the class loader owning the class reference
285 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
286 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
287
288 if (log_is_enabled(Info, classresolve) && !k->is_array_klass()) {
289 // skip resolving the constant pool so that this code gets
290 // called the next time some bytecodes refer to this class.
291 trace_class_resolution(this_cp, k);
292 return k();
293 } else {
294 this_cp->klass_at_put(which, k());
295 }
296
297 entry = this_cp->resolved_klass_at(which);
298 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
299 return entry.get_klass();
300 }
301
302
303 // Does not update ConstantPool* - to avoid any exception throwing. Used
304 // by compiler and exception handling. Also used to avoid classloads for
305 // instanceof operations. Returns NULL if the class has not been loaded or
306 // if the verification of constant pool failed
307 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
308 CPSlot entry = this_cp->slot_at(which);
309 if (entry.is_resolved()) {
310 assert(entry.get_klass()->is_klass(), "must be");
311 return entry.get_klass();
312 } else {
313 assert(entry.is_unresolved(), "must be either symbol or klass");
314 Thread *thread = Thread::current();
315 Symbol* name = entry.get_symbol();
316 oop loader = this_cp->pool_holder()->class_loader();
317 oop protection_domain = this_cp->pool_holder()->protection_domain();
318 Handle h_prot (thread, protection_domain);
319 Handle h_loader (thread, loader);
320 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
321
322 if (k != NULL) {
323 // Make sure that resolving is legal
324 EXCEPTION_MARK;
325 KlassHandle klass(THREAD, k);
326 // return NULL if verification fails
327 verify_constant_pool_resolve(this_cp, klass, THREAD);
328 if (HAS_PENDING_EXCEPTION) {
329 CLEAR_PENDING_EXCEPTION;
330 return NULL;
331 }
332 return klass();
333 } else {
334 return k;
335 }
336 }
337 }
338
339
340 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) {
341 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which));
342 }
343
344
345 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
346 int which) {
347 if (cpool->cache() == NULL) return NULL; // nothing to load yet
348 int cache_index = decode_cpcache_index(which, true);
349 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
350 // FIXME: should be an assert
351 if (PrintMiscellaneous && (Verbose||WizardMode)) {
352 tty->print_cr("bad operand %d in:", which); cpool->print();
353 }
354 return NULL;
355 }
356 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
357 return e->method_if_resolved(cpool);
358 }
359
360
361 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
362 if (cpool->cache() == NULL) return false; // nothing to load yet
363 int cache_index = decode_cpcache_index(which, true);
364 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
365 return e->has_appendix();
366 }
367
368 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
369 if (cpool->cache() == NULL) return NULL; // nothing to load yet
370 int cache_index = decode_cpcache_index(which, true);
371 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
372 return e->appendix_if_resolved(cpool);
373 }
374
375
376 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
377 if (cpool->cache() == NULL) return false; // nothing to load yet
378 int cache_index = decode_cpcache_index(which, true);
379 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
380 return e->has_method_type();
381 }
382
383 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
384 if (cpool->cache() == NULL) return NULL; // nothing to load yet
385 int cache_index = decode_cpcache_index(which, true);
386 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
387 return e->method_type_if_resolved(cpool);
388 }
389
390
391 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
392 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
393 return symbol_at(name_index);
394 }
395
396
397 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
398 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
399 return symbol_at(signature_index);
400 }
401
402
403 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
404 int i = which;
405 if (!uncached && cache() != NULL) {
406 if (ConstantPool::is_invokedynamic_index(which)) {
407 // Invokedynamic index is index into resolved_references
408 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
409 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
410 assert(tag_at(pool_index).is_name_and_type(), "");
411 return pool_index;
412 }
413 // change byte-ordering and go via cache
414 i = remap_instruction_operand_from_cache(which);
415 } else {
416 if (tag_at(which).is_invoke_dynamic()) {
417 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
418 assert(tag_at(pool_index).is_name_and_type(), "");
419 return pool_index;
420 }
421 }
422 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
423 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
424 jint ref_index = *int_at_addr(i);
425 return extract_high_short_from_int(ref_index);
426 }
427
428
429 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
430 guarantee(!ConstantPool::is_invokedynamic_index(which),
431 "an invokedynamic instruction does not have a klass");
432 int i = which;
433 if (!uncached && cache() != NULL) {
434 // change byte-ordering and go via cache
435 i = remap_instruction_operand_from_cache(which);
436 }
437 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
438 jint ref_index = *int_at_addr(i);
439 return extract_low_short_from_int(ref_index);
440 }
441
442
443
444 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
445 int cpc_index = operand;
446 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
447 assert((int)(u2)cpc_index == cpc_index, "clean u2");
448 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
449 return member_index;
450 }
451
452
453 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, KlassHandle k, TRAPS) {
454 if (k->is_instance_klass() || k->is_objArray_klass()) {
455 instanceKlassHandle holder (THREAD, this_cp->pool_holder());
456 Klass* elem = k->is_instance_klass() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
457 KlassHandle element (THREAD, elem);
458
459 // The element type could be a typeArray - we only need the access check if it is
460 // an reference to another class
461 if (element->is_instance_klass()) {
462 LinkResolver::check_klass_accessability(holder, element, CHECK);
463 }
464 }
465 }
466
467
468 int ConstantPool::name_ref_index_at(int which_nt) {
469 jint ref_index = name_and_type_at(which_nt);
470 return extract_low_short_from_int(ref_index);
471 }
472
473
474 int ConstantPool::signature_ref_index_at(int which_nt) {
475 jint ref_index = name_and_type_at(which_nt);
476 return extract_high_short_from_int(ref_index);
477 }
478
479
480 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
481 return klass_at(klass_ref_index_at(which), THREAD);
482 }
483
484
485 Symbol* ConstantPool::klass_name_at(int which) const {
486 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
487 "Corrupted constant pool");
488 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
489 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
490 // tag is not updated atomicly.
491 CPSlot entry = slot_at(which);
492 if (entry.is_resolved()) {
493 // Already resolved - return entry's name.
494 assert(entry.get_klass()->is_klass(), "must be");
495 return entry.get_klass()->name();
496 } else {
497 assert(entry.is_unresolved(), "must be either symbol or klass");
498 return entry.get_symbol();
499 }
500 }
501
502 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
503 jint ref_index = klass_ref_index_at(which);
504 return klass_at_noresolve(ref_index);
505 }
506
507 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
508 jint ref_index = uncached_klass_ref_index_at(which);
509 return klass_at_noresolve(ref_index);
510 }
511
512 char* ConstantPool::string_at_noresolve(int which) {
513 return unresolved_string_at(which)->as_C_string();
514 }
515
516 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
517 return FieldType::basic_type(symbol_at(which));
518 }
519
520
521 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
522 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
523 if (this_cp->tag_at(index).is_string()) {
524 this_cp->string_at(index, CHECK);
525 }
526 }
527 }
528
529 // Resolve all the classes in the constant pool. If they are all resolved,
530 // the constant pool is read-only. Enhancement: allocate cp entries to
531 // another metaspace, and copy to read-only or read-write space if this
532 // bit is set.
533 bool ConstantPool::resolve_class_constants(TRAPS) {
534 constantPoolHandle cp(THREAD, this);
535 for (int index = 1; index < length(); index++) { // Index 0 is unused
536 if (tag_at(index).is_unresolved_klass() &&
537 klass_at_if_loaded(cp, index) == NULL) {
538 return false;
539 }
540 }
541 // set_preresolution(); or some bit for future use
542 return true;
543 }
544
545 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
546 // Dig out the detailed message to reuse if possible
547 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
548 if (message != NULL) {
549 return message;
550 }
551
552 // Return specific message for the tag
553 switch (tag.value()) {
554 case JVM_CONSTANT_UnresolvedClass:
555 // return the class name in the error message
556 message = this_cp->klass_name_at(which);
557 break;
558 case JVM_CONSTANT_MethodHandle:
559 // return the method handle name in the error message
560 message = this_cp->method_handle_name_ref_at(which);
561 break;
562 case JVM_CONSTANT_MethodType:
563 // return the method type signature in the error message
564 message = this_cp->method_type_signature_at(which);
565 break;
566 default:
567 ShouldNotReachHere();
568 }
569
570 return message;
571 }
572
573 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
574 Symbol* message = NULL;
575 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
576 assert(error != NULL && message != NULL, "checking");
577 CLEAR_PENDING_EXCEPTION;
578 ResourceMark rm;
579 THROW_MSG(error, message->as_C_string());
580 }
581
582 // If resolution for Class, MethodHandle or MethodType fails, save the exception
583 // in the resolution error table, so that the same exception is thrown again.
584 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
585 constantTag tag, TRAPS) {
586 Symbol* error = PENDING_EXCEPTION->klass()->name();
587
588 int error_tag = tag.error_value();
589
590 if (!PENDING_EXCEPTION->
591 is_a(SystemDictionary::LinkageError_klass())) {
592 // Just throw the exception and don't prevent these classes from
593 // being loaded due to virtual machine errors like StackOverflow
594 // and OutOfMemoryError, etc, or if the thread was hit by stop()
595 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
596 } else if (this_cp->tag_at(which).value() != error_tag) {
597 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
598 SystemDictionary::add_resolution_error(this_cp, which, error, message);
599 // CAS in the tag. If a thread beat us to registering this error that's fine.
600 // If another thread resolved the reference, this is a race condition. This
601 // thread may have had a security manager or something temporary.
602 // This doesn't deterministically get an error. So why do we save this?
603 // We save this because jvmti can add classes to the bootclass path after
604 // this error, so it needs to get the same error if the error is first.
605 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
606 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
607 if (old_tag != error_tag && old_tag != tag.value()) {
608 // MethodHandles and MethodType doesn't change to resolved version.
609 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
610 // Forget the exception and use the resolved class.
611 CLEAR_PENDING_EXCEPTION;
612 }
613 } else {
614 // some other thread put this in error state
615 throw_resolution_error(this_cp, which, CHECK);
616 }
617 }
618
619 // Called to resolve constants in the constant pool and return an oop.
620 // Some constant pool entries cache their resolved oop. This is also
621 // called to create oops from constants to use in arguments for invokedynamic
622 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) {
623 oop result_oop = NULL;
624 Handle throw_exception;
625
626 if (cache_index == _possible_index_sentinel) {
627 // It is possible that this constant is one which is cached in the objects.
628 // We'll do a linear search. This should be OK because this usage is rare.
629 assert(index > 0, "valid index");
630 cache_index = this_cp->cp_to_object_index(index);
631 }
632 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
633 assert(index == _no_index_sentinel || index >= 0, "");
634
635 if (cache_index >= 0) {
636 result_oop = this_cp->resolved_references()->obj_at(cache_index);
637 if (result_oop != NULL) {
638 return result_oop;
639 // That was easy...
640 }
641 index = this_cp->object_to_cp_index(cache_index);
642 }
643
644 jvalue prim_value; // temp used only in a few cases below
645
646 constantTag tag = this_cp->tag_at(index);
647
648 switch (tag.value()) {
649
650 case JVM_CONSTANT_UnresolvedClass:
651 case JVM_CONSTANT_UnresolvedClassInError:
652 case JVM_CONSTANT_Class:
653 {
654 assert(cache_index == _no_index_sentinel, "should not have been set");
655 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
656 // ldc wants the java mirror.
657 result_oop = resolved->java_mirror();
658 break;
659 }
660
661 case JVM_CONSTANT_String:
662 assert(cache_index != _no_index_sentinel, "should have been set");
663 if (this_cp->is_pseudo_string_at(index)) {
664 result_oop = this_cp->pseudo_string_at(index, cache_index);
665 break;
666 }
667 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
668 break;
669
670 case JVM_CONSTANT_MethodHandleInError:
671 case JVM_CONSTANT_MethodTypeInError:
672 {
673 throw_resolution_error(this_cp, index, CHECK_NULL);
674 break;
675 }
676
677 case JVM_CONSTANT_MethodHandle:
678 {
679 int ref_kind = this_cp->method_handle_ref_kind_at(index);
680 int callee_index = this_cp->method_handle_klass_index_at(index);
681 Symbol* name = this_cp->method_handle_name_ref_at(index);
682 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
683 if (PrintMiscellaneous)
684 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
685 ref_kind, index, this_cp->method_handle_index_at(index),
686 callee_index, name->as_C_string(), signature->as_C_string());
687 KlassHandle callee;
688 { Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
689 callee = KlassHandle(THREAD, k);
690 }
691 KlassHandle klass(THREAD, this_cp->pool_holder());
692 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
693 callee, name, signature,
694 THREAD);
695 result_oop = value();
696 if (HAS_PENDING_EXCEPTION) {
697 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
698 }
699 break;
700 }
701
702 case JVM_CONSTANT_MethodType:
703 {
704 Symbol* signature = this_cp->method_type_signature_at(index);
705 if (PrintMiscellaneous)
706 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
707 index, this_cp->method_type_index_at(index),
708 signature->as_C_string());
709 KlassHandle klass(THREAD, this_cp->pool_holder());
710 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
711 result_oop = value();
712 if (HAS_PENDING_EXCEPTION) {
713 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
714 }
715 break;
716 }
717
718 case JVM_CONSTANT_Integer:
719 assert(cache_index == _no_index_sentinel, "should not have been set");
720 prim_value.i = this_cp->int_at(index);
721 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
722 break;
723
724 case JVM_CONSTANT_Float:
725 assert(cache_index == _no_index_sentinel, "should not have been set");
726 prim_value.f = this_cp->float_at(index);
727 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
728 break;
729
730 case JVM_CONSTANT_Long:
731 assert(cache_index == _no_index_sentinel, "should not have been set");
732 prim_value.j = this_cp->long_at(index);
733 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
734 break;
735
736 case JVM_CONSTANT_Double:
737 assert(cache_index == _no_index_sentinel, "should not have been set");
738 prim_value.d = this_cp->double_at(index);
739 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
740 break;
741
742 default:
743 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
744 this_cp(), index, cache_index, tag.value()));
745 assert(false, "unexpected constant tag");
746 break;
747 }
748
749 if (cache_index >= 0) {
750 // Benign race condition: resolved_references may already be filled in.
751 // The important thing here is that all threads pick up the same result.
752 // It doesn't matter which racing thread wins, as long as only one
753 // result is used by all threads, and all future queries.
754 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL);
755 if (old_result == NULL) {
756 return result_oop; // was installed
757 } else {
758 // Return the winning thread's result. This can be different than
759 // the result here for MethodHandles.
760 return old_result;
761 }
762 } else {
763 return result_oop;
764 }
765 }
766
767 oop ConstantPool::uncached_string_at(int which, TRAPS) {
768 Symbol* sym = unresolved_string_at(which);
769 oop str = StringTable::intern(sym, CHECK_(NULL));
770 assert(java_lang_String::is_instance(str), "must be string");
771 return str;
772 }
773
774
775 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) {
776 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
777
778 Handle bsm;
779 int argc;
780 {
781 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
782 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
783 // It is accompanied by the optional arguments.
784 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
785 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
786 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
787 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
788 }
789
790 // Extract the optional static arguments.
791 argc = this_cp->invoke_dynamic_argument_count_at(index);
792 if (argc == 0) return bsm_oop;
793
794 bsm = Handle(THREAD, bsm_oop);
795 }
796
797 objArrayHandle info;
798 {
799 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
800 info = objArrayHandle(THREAD, info_oop);
801 }
802
803 info->obj_at_put(0, bsm());
804 for (int i = 0; i < argc; i++) {
805 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
806 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
807 info->obj_at_put(1+i, arg_oop);
808 }
809
810 return info();
811 }
812
813 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
814 // If the string has already been interned, this entry will be non-null
815 oop str = this_cp->resolved_references()->obj_at(obj_index);
816 if (str != NULL) return str;
817 Symbol* sym = this_cp->unresolved_string_at(which);
818 str = StringTable::intern(sym, CHECK_(NULL));
819 this_cp->string_at_put(which, obj_index, str);
820 assert(java_lang_String::is_instance(str), "must be string");
821 return str;
822 }
823
824
825 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
826 int which) {
827 // Names are interned, so we can compare Symbol*s directly
828 Symbol* cp_name = klass_name_at(which);
829 return (cp_name == k->name());
830 }
831
832
833 // Iterate over symbols and decrement ones which are Symbol*s
834 // This is done during GC.
835 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
836 // these symbols but didn't increment the reference count.
837 void ConstantPool::unreference_symbols() {
838 for (int index = 1; index < length(); index++) { // Index 0 is unused
839 constantTag tag = tag_at(index);
840 if (tag.is_symbol()) {
841 symbol_at(index)->decrement_refcount();
842 }
843 }
844 }
845
846
847 // Compare this constant pool's entry at index1 to the constant pool
848 // cp2's entry at index2.
849 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
850 int index2, TRAPS) {
851
852 // The error tags are equivalent to non-error tags when comparing
853 jbyte t1 = tag_at(index1).non_error_value();
854 jbyte t2 = cp2->tag_at(index2).non_error_value();
855
856 if (t1 != t2) {
857 // Not the same entry type so there is nothing else to check. Note
858 // that this style of checking will consider resolved/unresolved
859 // class pairs as different.
860 // From the ConstantPool* API point of view, this is correct
861 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
862 // plays out in the context of ConstantPool* merging.
863 return false;
864 }
865
866 switch (t1) {
867 case JVM_CONSTANT_Class:
868 {
869 Klass* k1 = klass_at(index1, CHECK_false);
870 Klass* k2 = cp2->klass_at(index2, CHECK_false);
871 if (k1 == k2) {
872 return true;
873 }
874 } break;
875
876 case JVM_CONSTANT_ClassIndex:
877 {
878 int recur1 = klass_index_at(index1);
879 int recur2 = cp2->klass_index_at(index2);
880 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
881 if (match) {
882 return true;
883 }
884 } break;
885
886 case JVM_CONSTANT_Double:
887 {
888 jdouble d1 = double_at(index1);
889 jdouble d2 = cp2->double_at(index2);
890 if (d1 == d2) {
891 return true;
892 }
893 } break;
894
895 case JVM_CONSTANT_Fieldref:
896 case JVM_CONSTANT_InterfaceMethodref:
897 case JVM_CONSTANT_Methodref:
898 {
899 int recur1 = uncached_klass_ref_index_at(index1);
900 int recur2 = cp2->uncached_klass_ref_index_at(index2);
901 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
902 if (match) {
903 recur1 = uncached_name_and_type_ref_index_at(index1);
904 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
905 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
906 if (match) {
907 return true;
908 }
909 }
910 } break;
911
912 case JVM_CONSTANT_Float:
913 {
914 jfloat f1 = float_at(index1);
915 jfloat f2 = cp2->float_at(index2);
916 if (f1 == f2) {
917 return true;
918 }
919 } break;
920
921 case JVM_CONSTANT_Integer:
922 {
923 jint i1 = int_at(index1);
924 jint i2 = cp2->int_at(index2);
925 if (i1 == i2) {
926 return true;
927 }
928 } break;
929
930 case JVM_CONSTANT_Long:
931 {
932 jlong l1 = long_at(index1);
933 jlong l2 = cp2->long_at(index2);
934 if (l1 == l2) {
935 return true;
936 }
937 } break;
938
939 case JVM_CONSTANT_NameAndType:
940 {
941 int recur1 = name_ref_index_at(index1);
942 int recur2 = cp2->name_ref_index_at(index2);
943 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
944 if (match) {
945 recur1 = signature_ref_index_at(index1);
946 recur2 = cp2->signature_ref_index_at(index2);
947 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
948 if (match) {
949 return true;
950 }
951 }
952 } break;
953
954 case JVM_CONSTANT_StringIndex:
955 {
956 int recur1 = string_index_at(index1);
957 int recur2 = cp2->string_index_at(index2);
958 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
959 if (match) {
960 return true;
961 }
962 } break;
963
964 case JVM_CONSTANT_UnresolvedClass:
965 {
966 Symbol* k1 = klass_name_at(index1);
967 Symbol* k2 = cp2->klass_name_at(index2);
968 if (k1 == k2) {
969 return true;
970 }
971 } break;
972
973 case JVM_CONSTANT_MethodType:
974 {
975 int k1 = method_type_index_at_error_ok(index1);
976 int k2 = cp2->method_type_index_at_error_ok(index2);
977 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
978 if (match) {
979 return true;
980 }
981 } break;
982
983 case JVM_CONSTANT_MethodHandle:
984 {
985 int k1 = method_handle_ref_kind_at_error_ok(index1);
986 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2);
987 if (k1 == k2) {
988 int i1 = method_handle_index_at_error_ok(index1);
989 int i2 = cp2->method_handle_index_at_error_ok(index2);
990 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
991 if (match) {
992 return true;
993 }
994 }
995 } break;
996
997 case JVM_CONSTANT_InvokeDynamic:
998 {
999 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1000 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1001 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1002 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1003 // separate statements and variables because CHECK_false is used
1004 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1005 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1006 return (match_entry && match_operand);
1007 } break;
1008
1009 case JVM_CONSTANT_String:
1010 {
1011 Symbol* s1 = unresolved_string_at(index1);
1012 Symbol* s2 = cp2->unresolved_string_at(index2);
1013 if (s1 == s2) {
1014 return true;
1015 }
1016 } break;
1017
1018 case JVM_CONSTANT_Utf8:
1019 {
1020 Symbol* s1 = symbol_at(index1);
1021 Symbol* s2 = cp2->symbol_at(index2);
1022 if (s1 == s2) {
1023 return true;
1024 }
1025 } break;
1026
1027 // Invalid is used as the tag for the second constant pool entry
1028 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1029 // not be seen by itself.
1030 case JVM_CONSTANT_Invalid: // fall through
1031
1032 default:
1033 ShouldNotReachHere();
1034 break;
1035 }
1036
1037 return false;
1038 } // end compare_entry_to()
1039
1040
1041 // Resize the operands array with delta_len and delta_size.
1042 // Used in RedefineClasses for CP merge.
1043 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1044 int old_len = operand_array_length(operands());
1045 int new_len = old_len + delta_len;
1046 int min_len = (delta_len > 0) ? old_len : new_len;
1047
1048 int old_size = operands()->length();
1049 int new_size = old_size + delta_size;
1050 int min_size = (delta_size > 0) ? old_size : new_size;
1051
1052 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1053 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1054
1055 // Set index in the resized array for existing elements only
1056 for (int idx = 0; idx < min_len; idx++) {
1057 int offset = operand_offset_at(idx); // offset in original array
1058 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1059 }
1060 // Copy the bootstrap specifiers only
1061 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1062 new_ops->adr_at(2*new_len),
1063 (min_size - 2*min_len) * sizeof(u2));
1064 // Explicitly deallocate old operands array.
1065 // Note, it is not needed for 7u backport.
1066 if ( operands() != NULL) { // the safety check
1067 MetadataFactory::free_array<u2>(loader_data, operands());
1068 }
1069 set_operands(new_ops);
1070 } // end resize_operands()
1071
1072
1073 // Extend the operands array with the length and size of the ext_cp operands.
1074 // Used in RedefineClasses for CP merge.
1075 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1076 int delta_len = operand_array_length(ext_cp->operands());
1077 if (delta_len == 0) {
1078 return; // nothing to do
1079 }
1080 int delta_size = ext_cp->operands()->length();
1081
1082 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1083
1084 if (operand_array_length(operands()) == 0) {
1085 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1086 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1087 // The first element index defines the offset of second part
1088 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1089 set_operands(new_ops);
1090 } else {
1091 resize_operands(delta_len, delta_size, CHECK);
1092 }
1093
1094 } // end extend_operands()
1095
1096
1097 // Shrink the operands array to a smaller array with new_len length.
1098 // Used in RedefineClasses for CP merge.
1099 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1100 int old_len = operand_array_length(operands());
1101 if (new_len == old_len) {
1102 return; // nothing to do
1103 }
1104 assert(new_len < old_len, "shrunken operands array must be smaller");
1105
1106 int free_base = operand_next_offset_at(new_len - 1);
1107 int delta_len = new_len - old_len;
1108 int delta_size = 2*delta_len + free_base - operands()->length();
1109
1110 resize_operands(delta_len, delta_size, CHECK);
1111
1112 } // end shrink_operands()
1113
1114
1115 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1116 const constantPoolHandle& to_cp,
1117 TRAPS) {
1118
1119 int from_oplen = operand_array_length(from_cp->operands());
1120 int old_oplen = operand_array_length(to_cp->operands());
1121 if (from_oplen != 0) {
1122 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1123 // append my operands to the target's operands array
1124 if (old_oplen == 0) {
1125 // Can't just reuse from_cp's operand list because of deallocation issues
1126 int len = from_cp->operands()->length();
1127 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1128 Copy::conjoint_memory_atomic(
1129 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1130 to_cp->set_operands(new_ops);
1131 } else {
1132 int old_len = to_cp->operands()->length();
1133 int from_len = from_cp->operands()->length();
1134 int old_off = old_oplen * sizeof(u2);
1135 int from_off = from_oplen * sizeof(u2);
1136 // Use the metaspace for the destination constant pool
1137 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1138 int fillp = 0, len = 0;
1139 // first part of dest
1140 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1141 new_operands->adr_at(fillp),
1142 (len = old_off) * sizeof(u2));
1143 fillp += len;
1144 // first part of src
1145 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1146 new_operands->adr_at(fillp),
1147 (len = from_off) * sizeof(u2));
1148 fillp += len;
1149 // second part of dest
1150 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1151 new_operands->adr_at(fillp),
1152 (len = old_len - old_off) * sizeof(u2));
1153 fillp += len;
1154 // second part of src
1155 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1156 new_operands->adr_at(fillp),
1157 (len = from_len - from_off) * sizeof(u2));
1158 fillp += len;
1159 assert(fillp == new_operands->length(), "");
1160
1161 // Adjust indexes in the first part of the copied operands array.
1162 for (int j = 0; j < from_oplen; j++) {
1163 int offset = operand_offset_at(new_operands, old_oplen + j);
1164 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1165 offset += old_len; // every new tuple is preceded by old_len extra u2's
1166 operand_offset_at_put(new_operands, old_oplen + j, offset);
1167 }
1168
1169 // replace target operands array with combined array
1170 to_cp->set_operands(new_operands);
1171 }
1172 }
1173 } // end copy_operands()
1174
1175
1176 // Copy this constant pool's entries at start_i to end_i (inclusive)
1177 // to the constant pool to_cp's entries starting at to_i. A total of
1178 // (end_i - start_i) + 1 entries are copied.
1179 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1180 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1181
1182
1183 int dest_i = to_i; // leave original alone for debug purposes
1184
1185 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1186 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1187
1188 switch (from_cp->tag_at(src_i).value()) {
1189 case JVM_CONSTANT_Double:
1190 case JVM_CONSTANT_Long:
1191 // double and long take two constant pool entries
1192 src_i += 2;
1193 dest_i += 2;
1194 break;
1195
1196 default:
1197 // all others take one constant pool entry
1198 src_i++;
1199 dest_i++;
1200 break;
1201 }
1202 }
1203 copy_operands(from_cp, to_cp, CHECK);
1204
1205 } // end copy_cp_to_impl()
1206
1207
1208 // Copy this constant pool's entry at from_i to the constant pool
1209 // to_cp's entry at to_i.
1210 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1211 const constantPoolHandle& to_cp, int to_i,
1212 TRAPS) {
1213
1214 int tag = from_cp->tag_at(from_i).value();
1215 switch (tag) {
1216 case JVM_CONSTANT_Class:
1217 {
1218 Klass* k = from_cp->klass_at(from_i, CHECK);
1219 to_cp->klass_at_put(to_i, k);
1220 } break;
1221
1222 case JVM_CONSTANT_ClassIndex:
1223 {
1224 jint ki = from_cp->klass_index_at(from_i);
1225 to_cp->klass_index_at_put(to_i, ki);
1226 } break;
1227
1228 case JVM_CONSTANT_Double:
1229 {
1230 jdouble d = from_cp->double_at(from_i);
1231 to_cp->double_at_put(to_i, d);
1232 // double takes two constant pool entries so init second entry's tag
1233 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1234 } break;
1235
1236 case JVM_CONSTANT_Fieldref:
1237 {
1238 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1239 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1240 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1241 } break;
1242
1243 case JVM_CONSTANT_Float:
1244 {
1245 jfloat f = from_cp->float_at(from_i);
1246 to_cp->float_at_put(to_i, f);
1247 } break;
1248
1249 case JVM_CONSTANT_Integer:
1250 {
1251 jint i = from_cp->int_at(from_i);
1252 to_cp->int_at_put(to_i, i);
1253 } break;
1254
1255 case JVM_CONSTANT_InterfaceMethodref:
1256 {
1257 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1258 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1259 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1260 } break;
1261
1262 case JVM_CONSTANT_Long:
1263 {
1264 jlong l = from_cp->long_at(from_i);
1265 to_cp->long_at_put(to_i, l);
1266 // long takes two constant pool entries so init second entry's tag
1267 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1268 } break;
1269
1270 case JVM_CONSTANT_Methodref:
1271 {
1272 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1273 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1274 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1275 } break;
1276
1277 case JVM_CONSTANT_NameAndType:
1278 {
1279 int name_ref_index = from_cp->name_ref_index_at(from_i);
1280 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1281 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1282 } break;
1283
1284 case JVM_CONSTANT_StringIndex:
1285 {
1286 jint si = from_cp->string_index_at(from_i);
1287 to_cp->string_index_at_put(to_i, si);
1288 } break;
1289
1290 case JVM_CONSTANT_UnresolvedClass:
1291 case JVM_CONSTANT_UnresolvedClassInError:
1292 {
1293 // Can be resolved after checking tag, so check the slot first.
1294 CPSlot entry = from_cp->slot_at(from_i);
1295 if (entry.is_resolved()) {
1296 assert(entry.get_klass()->is_klass(), "must be");
1297 // Already resolved
1298 to_cp->klass_at_put(to_i, entry.get_klass());
1299 } else {
1300 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1301 }
1302 } break;
1303
1304 case JVM_CONSTANT_String:
1305 {
1306 Symbol* s = from_cp->unresolved_string_at(from_i);
1307 to_cp->unresolved_string_at_put(to_i, s);
1308 } break;
1309
1310 case JVM_CONSTANT_Utf8:
1311 {
1312 Symbol* s = from_cp->symbol_at(from_i);
1313 // Need to increase refcount, the old one will be thrown away and deferenced
1314 s->increment_refcount();
1315 to_cp->symbol_at_put(to_i, s);
1316 } break;
1317
1318 case JVM_CONSTANT_MethodType:
1319 case JVM_CONSTANT_MethodTypeInError:
1320 {
1321 jint k = from_cp->method_type_index_at_error_ok(from_i);
1322 to_cp->method_type_index_at_put(to_i, k);
1323 } break;
1324
1325 case JVM_CONSTANT_MethodHandle:
1326 case JVM_CONSTANT_MethodHandleInError:
1327 {
1328 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i);
1329 int k2 = from_cp->method_handle_index_at_error_ok(from_i);
1330 to_cp->method_handle_index_at_put(to_i, k1, k2);
1331 } break;
1332
1333 case JVM_CONSTANT_InvokeDynamic:
1334 {
1335 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1336 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1337 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1338 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1339 } break;
1340
1341 // Invalid is used as the tag for the second constant pool entry
1342 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1343 // not be seen by itself.
1344 case JVM_CONSTANT_Invalid: // fall through
1345
1346 default:
1347 {
1348 ShouldNotReachHere();
1349 } break;
1350 }
1351 } // end copy_entry_to()
1352
1353
1354 // Search constant pool search_cp for an entry that matches this
1355 // constant pool's entry at pattern_i. Returns the index of a
1356 // matching entry or zero (0) if there is no matching entry.
1357 int ConstantPool::find_matching_entry(int pattern_i,
1358 const constantPoolHandle& search_cp, TRAPS) {
1359
1360 // index zero (0) is not used
1361 for (int i = 1; i < search_cp->length(); i++) {
1362 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1363 if (found) {
1364 return i;
1365 }
1366 }
1367
1368 return 0; // entry not found; return unused index zero (0)
1369 } // end find_matching_entry()
1370
1371
1372 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1373 // cp2's bootstrap specifier at idx2.
1374 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1375 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1376 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1377 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1378
1379 if (!match) {
1380 return false;
1381 }
1382 int argc = operand_argument_count_at(idx1);
1383 if (argc == cp2->operand_argument_count_at(idx2)) {
1384 for (int j = 0; j < argc; j++) {
1385 k1 = operand_argument_index_at(idx1, j);
1386 k2 = cp2->operand_argument_index_at(idx2, j);
1387 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1388 if (!match) {
1389 return false;
1390 }
1391 }
1392 return true; // got through loop; all elements equal
1393 }
1394 return false;
1395 } // end compare_operand_to()
1396
1397 // Search constant pool search_cp for a bootstrap specifier that matches
1398 // this constant pool's bootstrap specifier at pattern_i index.
1399 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1400 int ConstantPool::find_matching_operand(int pattern_i,
1401 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1402 for (int i = 0; i < search_len; i++) {
1403 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1404 if (found) {
1405 return i;
1406 }
1407 }
1408 return -1; // bootstrap specifier not found; return unused index (-1)
1409 } // end find_matching_operand()
1410
1411
1412 #ifndef PRODUCT
1413
1414 const char* ConstantPool::printable_name_at(int which) {
1415
1416 constantTag tag = tag_at(which);
1417
1418 if (tag.is_string()) {
1419 return string_at_noresolve(which);
1420 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1421 return klass_name_at(which)->as_C_string();
1422 } else if (tag.is_symbol()) {
1423 return symbol_at(which)->as_C_string();
1424 }
1425 return "";
1426 }
1427
1428 #endif // PRODUCT
1429
1430
1431 // JVMTI GetConstantPool support
1432
1433 // For debugging of constant pool
1434 const bool debug_cpool = false;
1435
1436 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1437
1438 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1439 const char* WARN_MSG = "Must not be such entry!";
1440 jint size = 0;
1441 u2 idx1, idx2;
1442
1443 for (jint idx = 1; idx < cnt; idx++) {
1444 jint ent_size = 0;
1445 u1 tag = *bytes++;
1446 size++; // count tag
1447
1448 printf("const #%03d, tag: %02d ", idx, tag);
1449 switch(tag) {
1450 case JVM_CONSTANT_Invalid: {
1451 printf("Invalid");
1452 break;
1453 }
1454 case JVM_CONSTANT_Unicode: {
1455 printf("Unicode %s", WARN_MSG);
1456 break;
1457 }
1458 case JVM_CONSTANT_Utf8: {
1459 u2 len = Bytes::get_Java_u2(bytes);
1460 char str[128];
1461 if (len > 127) {
1462 len = 127;
1463 }
1464 strncpy(str, (char *) (bytes+2), len);
1465 str[len] = '\0';
1466 printf("Utf8 \"%s\"", str);
1467 ent_size = 2 + len;
1468 break;
1469 }
1470 case JVM_CONSTANT_Integer: {
1471 u4 val = Bytes::get_Java_u4(bytes);
1472 printf("int %d", *(int *) &val);
1473 ent_size = 4;
1474 break;
1475 }
1476 case JVM_CONSTANT_Float: {
1477 u4 val = Bytes::get_Java_u4(bytes);
1478 printf("float %5.3ff", *(float *) &val);
1479 ent_size = 4;
1480 break;
1481 }
1482 case JVM_CONSTANT_Long: {
1483 u8 val = Bytes::get_Java_u8(bytes);
1484 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1485 ent_size = 8;
1486 idx++; // Long takes two cpool slots
1487 break;
1488 }
1489 case JVM_CONSTANT_Double: {
1490 u8 val = Bytes::get_Java_u8(bytes);
1491 printf("double %5.3fd", *(jdouble *)&val);
1492 ent_size = 8;
1493 idx++; // Double takes two cpool slots
1494 break;
1495 }
1496 case JVM_CONSTANT_Class: {
1497 idx1 = Bytes::get_Java_u2(bytes);
1498 printf("class #%03d", idx1);
1499 ent_size = 2;
1500 break;
1501 }
1502 case JVM_CONSTANT_String: {
1503 idx1 = Bytes::get_Java_u2(bytes);
1504 printf("String #%03d", idx1);
1505 ent_size = 2;
1506 break;
1507 }
1508 case JVM_CONSTANT_Fieldref: {
1509 idx1 = Bytes::get_Java_u2(bytes);
1510 idx2 = Bytes::get_Java_u2(bytes+2);
1511 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1512 ent_size = 4;
1513 break;
1514 }
1515 case JVM_CONSTANT_Methodref: {
1516 idx1 = Bytes::get_Java_u2(bytes);
1517 idx2 = Bytes::get_Java_u2(bytes+2);
1518 printf("Method #%03d, #%03d", idx1, idx2);
1519 ent_size = 4;
1520 break;
1521 }
1522 case JVM_CONSTANT_InterfaceMethodref: {
1523 idx1 = Bytes::get_Java_u2(bytes);
1524 idx2 = Bytes::get_Java_u2(bytes+2);
1525 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1526 ent_size = 4;
1527 break;
1528 }
1529 case JVM_CONSTANT_NameAndType: {
1530 idx1 = Bytes::get_Java_u2(bytes);
1531 idx2 = Bytes::get_Java_u2(bytes+2);
1532 printf("NameAndType #%03d, #%03d", idx1, idx2);
1533 ent_size = 4;
1534 break;
1535 }
1536 case JVM_CONSTANT_ClassIndex: {
1537 printf("ClassIndex %s", WARN_MSG);
1538 break;
1539 }
1540 case JVM_CONSTANT_UnresolvedClass: {
1541 printf("UnresolvedClass: %s", WARN_MSG);
1542 break;
1543 }
1544 case JVM_CONSTANT_UnresolvedClassInError: {
1545 printf("UnresolvedClassInErr: %s", WARN_MSG);
1546 break;
1547 }
1548 case JVM_CONSTANT_StringIndex: {
1549 printf("StringIndex: %s", WARN_MSG);
1550 break;
1551 }
1552 }
1553 printf(";\n");
1554 bytes += ent_size;
1555 size += ent_size;
1556 }
1557 printf("Cpool size: %d\n", size);
1558 fflush(0);
1559 return;
1560 } /* end print_cpool_bytes */
1561
1562
1563 // Returns size of constant pool entry.
1564 jint ConstantPool::cpool_entry_size(jint idx) {
1565 switch(tag_at(idx).value()) {
1566 case JVM_CONSTANT_Invalid:
1567 case JVM_CONSTANT_Unicode:
1568 return 1;
1569
1570 case JVM_CONSTANT_Utf8:
1571 return 3 + symbol_at(idx)->utf8_length();
1572
1573 case JVM_CONSTANT_Class:
1574 case JVM_CONSTANT_String:
1575 case JVM_CONSTANT_ClassIndex:
1576 case JVM_CONSTANT_UnresolvedClass:
1577 case JVM_CONSTANT_UnresolvedClassInError:
1578 case JVM_CONSTANT_StringIndex:
1579 case JVM_CONSTANT_MethodType:
1580 case JVM_CONSTANT_MethodTypeInError:
1581 return 3;
1582
1583 case JVM_CONSTANT_MethodHandle:
1584 case JVM_CONSTANT_MethodHandleInError:
1585 return 4; //tag, ref_kind, ref_index
1586
1587 case JVM_CONSTANT_Integer:
1588 case JVM_CONSTANT_Float:
1589 case JVM_CONSTANT_Fieldref:
1590 case JVM_CONSTANT_Methodref:
1591 case JVM_CONSTANT_InterfaceMethodref:
1592 case JVM_CONSTANT_NameAndType:
1593 return 5;
1594
1595 case JVM_CONSTANT_InvokeDynamic:
1596 // u1 tag, u2 bsm, u2 nt
1597 return 5;
1598
1599 case JVM_CONSTANT_Long:
1600 case JVM_CONSTANT_Double:
1601 return 9;
1602 }
1603 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1604 return 1;
1605 } /* end cpool_entry_size */
1606
1607
1608 // SymbolHashMap is used to find a constant pool index from a string.
1609 // This function fills in SymbolHashMaps, one for utf8s and one for
1610 // class names, returns size of the cpool raw bytes.
1611 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1612 SymbolHashMap *classmap) {
1613 jint size = 0;
1614
1615 for (u2 idx = 1; idx < length(); idx++) {
1616 u2 tag = tag_at(idx).value();
1617 size += cpool_entry_size(idx);
1618
1619 switch(tag) {
1620 case JVM_CONSTANT_Utf8: {
1621 Symbol* sym = symbol_at(idx);
1622 symmap->add_entry(sym, idx);
1623 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1624 break;
1625 }
1626 case JVM_CONSTANT_Class:
1627 case JVM_CONSTANT_UnresolvedClass:
1628 case JVM_CONSTANT_UnresolvedClassInError: {
1629 Symbol* sym = klass_name_at(idx);
1630 classmap->add_entry(sym, idx);
1631 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1632 break;
1633 }
1634 case JVM_CONSTANT_Long:
1635 case JVM_CONSTANT_Double: {
1636 idx++; // Both Long and Double take two cpool slots
1637 break;
1638 }
1639 }
1640 }
1641 return size;
1642 } /* end hash_utf8_entries_to */
1643
1644
1645 // Copy cpool bytes.
1646 // Returns:
1647 // 0, in case of OutOfMemoryError
1648 // -1, in case of internal error
1649 // > 0, count of the raw cpool bytes that have been copied
1650 int ConstantPool::copy_cpool_bytes(int cpool_size,
1651 SymbolHashMap* tbl,
1652 unsigned char *bytes) {
1653 u2 idx1, idx2;
1654 jint size = 0;
1655 jint cnt = length();
1656 unsigned char *start_bytes = bytes;
1657
1658 for (jint idx = 1; idx < cnt; idx++) {
1659 u1 tag = tag_at(idx).value();
1660 jint ent_size = cpool_entry_size(idx);
1661
1662 assert(size + ent_size <= cpool_size, "Size mismatch");
1663
1664 *bytes = tag;
1665 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1666 switch(tag) {
1667 case JVM_CONSTANT_Invalid: {
1668 DBG(printf("JVM_CONSTANT_Invalid"));
1669 break;
1670 }
1671 case JVM_CONSTANT_Unicode: {
1672 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1673 DBG(printf("JVM_CONSTANT_Unicode"));
1674 break;
1675 }
1676 case JVM_CONSTANT_Utf8: {
1677 Symbol* sym = symbol_at(idx);
1678 char* str = sym->as_utf8();
1679 // Warning! It's crashing on x86 with len = sym->utf8_length()
1680 int len = (int) strlen(str);
1681 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1682 for (int i = 0; i < len; i++) {
1683 bytes[3+i] = (u1) str[i];
1684 }
1685 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1686 break;
1687 }
1688 case JVM_CONSTANT_Integer: {
1689 jint val = int_at(idx);
1690 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1691 break;
1692 }
1693 case JVM_CONSTANT_Float: {
1694 jfloat val = float_at(idx);
1695 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1696 break;
1697 }
1698 case JVM_CONSTANT_Long: {
1699 jlong val = long_at(idx);
1700 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1701 idx++; // Long takes two cpool slots
1702 break;
1703 }
1704 case JVM_CONSTANT_Double: {
1705 jdouble val = double_at(idx);
1706 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1707 idx++; // Double takes two cpool slots
1708 break;
1709 }
1710 case JVM_CONSTANT_Class:
1711 case JVM_CONSTANT_UnresolvedClass:
1712 case JVM_CONSTANT_UnresolvedClassInError: {
1713 *bytes = JVM_CONSTANT_Class;
1714 Symbol* sym = klass_name_at(idx);
1715 idx1 = tbl->symbol_to_value(sym);
1716 assert(idx1 != 0, "Have not found a hashtable entry");
1717 Bytes::put_Java_u2((address) (bytes+1), idx1);
1718 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1719 break;
1720 }
1721 case JVM_CONSTANT_String: {
1722 *bytes = JVM_CONSTANT_String;
1723 Symbol* sym = unresolved_string_at(idx);
1724 idx1 = tbl->symbol_to_value(sym);
1725 assert(idx1 != 0, "Have not found a hashtable entry");
1726 Bytes::put_Java_u2((address) (bytes+1), idx1);
1727 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1728 break;
1729 }
1730 case JVM_CONSTANT_Fieldref:
1731 case JVM_CONSTANT_Methodref:
1732 case JVM_CONSTANT_InterfaceMethodref: {
1733 idx1 = uncached_klass_ref_index_at(idx);
1734 idx2 = uncached_name_and_type_ref_index_at(idx);
1735 Bytes::put_Java_u2((address) (bytes+1), idx1);
1736 Bytes::put_Java_u2((address) (bytes+3), idx2);
1737 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1738 break;
1739 }
1740 case JVM_CONSTANT_NameAndType: {
1741 idx1 = name_ref_index_at(idx);
1742 idx2 = signature_ref_index_at(idx);
1743 Bytes::put_Java_u2((address) (bytes+1), idx1);
1744 Bytes::put_Java_u2((address) (bytes+3), idx2);
1745 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1746 break;
1747 }
1748 case JVM_CONSTANT_ClassIndex: {
1749 *bytes = JVM_CONSTANT_Class;
1750 idx1 = klass_index_at(idx);
1751 Bytes::put_Java_u2((address) (bytes+1), idx1);
1752 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1753 break;
1754 }
1755 case JVM_CONSTANT_StringIndex: {
1756 *bytes = JVM_CONSTANT_String;
1757 idx1 = string_index_at(idx);
1758 Bytes::put_Java_u2((address) (bytes+1), idx1);
1759 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1760 break;
1761 }
1762 case JVM_CONSTANT_MethodHandle:
1763 case JVM_CONSTANT_MethodHandleInError: {
1764 *bytes = JVM_CONSTANT_MethodHandle;
1765 int kind = method_handle_ref_kind_at_error_ok(idx);
1766 idx1 = method_handle_index_at_error_ok(idx);
1767 *(bytes+1) = (unsigned char) kind;
1768 Bytes::put_Java_u2((address) (bytes+2), idx1);
1769 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1770 break;
1771 }
1772 case JVM_CONSTANT_MethodType:
1773 case JVM_CONSTANT_MethodTypeInError: {
1774 *bytes = JVM_CONSTANT_MethodType;
1775 idx1 = method_type_index_at_error_ok(idx);
1776 Bytes::put_Java_u2((address) (bytes+1), idx1);
1777 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1778 break;
1779 }
1780 case JVM_CONSTANT_InvokeDynamic: {
1781 *bytes = tag;
1782 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1783 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1784 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1785 Bytes::put_Java_u2((address) (bytes+1), idx1);
1786 Bytes::put_Java_u2((address) (bytes+3), idx2);
1787 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1788 break;
1789 }
1790 }
1791 DBG(printf("\n"));
1792 bytes += ent_size;
1793 size += ent_size;
1794 }
1795 assert(size == cpool_size, "Size mismatch");
1796
1797 // Keep temorarily for debugging until it's stable.
1798 DBG(print_cpool_bytes(cnt, start_bytes));
1799 return (int)(bytes - start_bytes);
1800 } /* end copy_cpool_bytes */
1801
1802 #undef DBG
1803
1804
1805 void ConstantPool::set_on_stack(const bool value) {
1806 if (value) {
1807 // Only record if it's not already set.
1808 if (!on_stack()) {
1809 _flags |= _on_stack;
1810 MetadataOnStackMark::record(this);
1811 }
1812 } else {
1813 // Clearing is done single-threadedly.
1814 _flags &= ~_on_stack;
1815 }
1816 }
1817
1818 // JSR 292 support for patching constant pool oops after the class is linked and
1819 // the oop array for resolved references are created.
1820 // We can't do this during classfile parsing, which is how the other indexes are
1821 // patched. The other patches are applied early for some error checking
1822 // so only defer the pseudo_strings.
1823 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
1824 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1825 Handle patch = cp_patches->at(index);
1826 if (patch.not_null()) {
1827 assert (tag_at(index).is_string(), "should only be string left");
1828 // Patching a string means pre-resolving it.
1829 // The spelling in the constant pool is ignored.
1830 // The constant reference may be any object whatever.
1831 // If it is not a real interned string, the constant is referred
1832 // to as a "pseudo-string", and must be presented to the CP
1833 // explicitly, because it may require scavenging.
1834 int obj_index = cp_to_object_index(index);
1835 pseudo_string_at_put(index, obj_index, patch());
1836 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1837 }
1838 }
1839 #ifdef ASSERT
1840 // Ensure that all the patches have been used.
1841 for (int index = 0; index < cp_patches->length(); index++) {
1842 assert(cp_patches->at(index).is_null(),
1843 "Unused constant pool patch at %d in class file %s",
1844 index,
1845 pool_holder()->external_name());
1846 }
1847 #endif // ASSERT
1848 }
1849
1850 #ifndef PRODUCT
1851
1852 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1853 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1854 guarantee(obj->is_constantPool(), "object must be constant pool");
1855 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1856 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1857
1858 for (int i = 0; i< cp->length(); i++) {
1859 if (cp->tag_at(i).is_unresolved_klass()) {
1860 // This will force loading of the class
1861 Klass* klass = cp->klass_at(i, CHECK);
1862 if (klass->is_instance_klass()) {
1863 // Force initialization of class
1864 InstanceKlass::cast(klass)->initialize(CHECK);
1865 }
1866 }
1867 }
1868 }
1869
1870 #endif
1871
1872
1873 // Printing
1874
1875 void ConstantPool::print_on(outputStream* st) const {
1876 assert(is_constantPool(), "must be constantPool");
1877 st->print_cr("%s", internal_name());
1878 if (flags() != 0) {
1879 st->print(" - flags: 0x%x", flags());
1880 if (has_preresolution()) st->print(" has_preresolution");
1881 if (on_stack()) st->print(" on_stack");
1882 st->cr();
1883 }
1884 if (pool_holder() != NULL) {
1885 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
1886 }
1887 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
1888 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
1889 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
1890
1891 for (int index = 1; index < length(); index++) { // Index 0 is unused
1892 ((ConstantPool*)this)->print_entry_on(index, st);
1893 switch (tag_at(index).value()) {
1894 case JVM_CONSTANT_Long :
1895 case JVM_CONSTANT_Double :
1896 index++; // Skip entry following eigth-byte constant
1897 }
1898
1899 }
1900 st->cr();
1901 }
1902
1903 // Print one constant pool entry
1904 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1905 EXCEPTION_MARK;
1906 st->print(" - %3d : ", index);
1907 tag_at(index).print_on(st);
1908 st->print(" : ");
1909 switch (tag_at(index).value()) {
1910 case JVM_CONSTANT_Class :
1911 { Klass* k = klass_at(index, CATCH);
1912 guarantee(k != NULL, "need klass");
1913 k->print_value_on(st);
1914 st->print(" {" PTR_FORMAT "}", p2i(k));
1915 }
1916 break;
1917 case JVM_CONSTANT_Fieldref :
1918 case JVM_CONSTANT_Methodref :
1919 case JVM_CONSTANT_InterfaceMethodref :
1920 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1921 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1922 break;
1923 case JVM_CONSTANT_String :
1924 if (is_pseudo_string_at(index)) {
1925 oop anObj = pseudo_string_at(index);
1926 anObj->print_value_on(st);
1927 st->print(" {" PTR_FORMAT "}", p2i(anObj));
1928 } else {
1929 unresolved_string_at(index)->print_value_on(st);
1930 }
1931 break;
1932 case JVM_CONSTANT_Integer :
1933 st->print("%d", int_at(index));
1934 break;
1935 case JVM_CONSTANT_Float :
1936 st->print("%f", float_at(index));
1937 break;
1938 case JVM_CONSTANT_Long :
1939 st->print_jlong(long_at(index));
1940 break;
1941 case JVM_CONSTANT_Double :
1942 st->print("%lf", double_at(index));
1943 break;
1944 case JVM_CONSTANT_NameAndType :
1945 st->print("name_index=%d", name_ref_index_at(index));
1946 st->print(" signature_index=%d", signature_ref_index_at(index));
1947 break;
1948 case JVM_CONSTANT_Utf8 :
1949 symbol_at(index)->print_value_on(st);
1950 break;
1951 case JVM_CONSTANT_UnresolvedClass : // fall-through
1952 case JVM_CONSTANT_UnresolvedClassInError: {
1953 CPSlot entry = slot_at(index);
1954 if (entry.is_resolved()) {
1955 entry.get_klass()->print_value_on(st);
1956 } else {
1957 entry.get_symbol()->print_value_on(st);
1958 }
1959 }
1960 break;
1961 case JVM_CONSTANT_MethodHandle :
1962 case JVM_CONSTANT_MethodHandleInError :
1963 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index));
1964 st->print(" ref_index=%d", method_handle_index_at_error_ok(index));
1965 break;
1966 case JVM_CONSTANT_MethodType :
1967 case JVM_CONSTANT_MethodTypeInError :
1968 st->print("signature_index=%d", method_type_index_at_error_ok(index));
1969 break;
1970 case JVM_CONSTANT_InvokeDynamic :
1971 {
1972 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1973 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1974 int argc = invoke_dynamic_argument_count_at(index);
1975 if (argc > 0) {
1976 for (int arg_i = 0; arg_i < argc; arg_i++) {
1977 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1978 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1979 }
1980 st->print("}");
1981 }
1982 }
1983 break;
1984 default:
1985 ShouldNotReachHere();
1986 break;
1987 }
1988 st->cr();
1989 }
1990
1991 void ConstantPool::print_value_on(outputStream* st) const {
1992 assert(is_constantPool(), "must be constantPool");
1993 st->print("constant pool [%d]", length());
1994 if (has_preresolution()) st->print("/preresolution");
1995 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
1996 print_address_on(st);
1997 st->print(" for ");
1998 pool_holder()->print_value_on(st);
1999 if (pool_holder() != NULL) {
2000 bool extra = (pool_holder()->constants() != this);
2001 if (extra) st->print(" (extra)");
2002 }
2003 if (cache() != NULL) {
2004 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2005 }
2006 }
2007
2008 #if INCLUDE_SERVICES
2009 // Size Statistics
2010 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2011 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2012 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2013 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2014 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2015 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2016
2017 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2018 sz->_cp_refmap_bytes;
2019 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2020 }
2021 #endif // INCLUDE_SERVICES
2022
2023 // Verification
2024
2025 void ConstantPool::verify_on(outputStream* st) {
2026 guarantee(is_constantPool(), "object must be constant pool");
2027 for (int i = 0; i< length(); i++) {
2028 constantTag tag = tag_at(i);
2029 CPSlot entry = slot_at(i);
2030 if (tag.is_klass()) {
2031 if (entry.is_resolved()) {
2032 guarantee(entry.get_klass()->is_klass(), "should be klass");
2033 }
2034 } else if (tag.is_unresolved_klass()) {
2035 if (entry.is_resolved()) {
2036 guarantee(entry.get_klass()->is_klass(), "should be klass");
2037 }
2038 } else if (tag.is_symbol()) {
2039 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2040 } else if (tag.is_string()) {
2041 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2042 }
2043 }
2044 if (cache() != NULL) {
2045 // Note: cache() can be NULL before a class is completely setup or
2046 // in temporary constant pools used during constant pool merging
2047 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2048 }
2049 if (pool_holder() != NULL) {
2050 // Note: pool_holder() can be NULL in temporary constant pools
2051 // used during constant pool merging
2052 guarantee(pool_holder()->is_klass(), "should be klass");
2053 }
2054 }
2055
2056
2057 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2058 char *str = sym->as_utf8();
2059 unsigned int hash = compute_hash(str, sym->utf8_length());
2060 unsigned int index = hash % table_size();
2061
2062 // check if already in map
2063 // we prefer the first entry since it is more likely to be what was used in
2064 // the class file
2065 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2066 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2067 if (en->hash() == hash && en->symbol() == sym) {
2068 return; // already there
2069 }
2070 }
2071
2072 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2073 entry->set_next(bucket(index));
2074 _buckets[index].set_entry(entry);
2075 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2076 }
2077
2078 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2079 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2080 char *str = sym->as_utf8();
2081 int len = sym->utf8_length();
2082 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2083 unsigned int index = hash % table_size();
2084 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2085 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2086 if (en->hash() == hash && en->symbol() == sym) {
2087 return en;
2088 }
2089 }
2090 return NULL;
2091 }