1 /*
2 * Copyright (c) 1997, 2018, 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.hpp"
28 #include "classfile/metadataOnStackMark.hpp"
29 #include "classfile/symbolTable.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 "runtime/fieldType.hpp"
40 #include "runtime/init.hpp"
41 #include "runtime/javaCalls.hpp"
42 #include "runtime/signature.hpp"
43 #include "runtime/vframe.hpp"
44
45 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
46
47 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
48 // Tags are RW but comment below applies to tags also.
49 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
50
51 int size = ConstantPool::size(length);
52
53 // CDS considerations:
54 // Allocate read-write but may be able to move to read-only at dumping time
55 // if all the klasses are resolved. The only other field that is writable is
56 // the resolved_references array, which is recreated at startup time.
57 // But that could be moved to InstanceKlass (although a pain to access from
58 // assembly code). Maybe it could be moved to the cpCache which is RW.
59 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
60 }
61
62 ConstantPool::ConstantPool(Array<u1>* tags) {
63 set_length(tags->length());
64 set_tags(NULL);
65 set_cache(NULL);
66 set_reference_map(NULL);
67 set_resolved_references(NULL);
68 set_operands(NULL);
69 set_pool_holder(NULL);
70 set_flags(0);
71
72 // only set to non-zero if constant pool is merged by RedefineClasses
73 set_version(0);
74 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
75
76 // initialize tag array
77 int length = tags->length();
78 for (int index = 0; index < length; index++) {
79 tags->at_put(index, JVM_CONSTANT_Invalid);
80 }
81 set_tags(tags);
82 }
83
84 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
85 MetadataFactory::free_metadata(loader_data, cache());
86 set_cache(NULL);
87 MetadataFactory::free_array<u2>(loader_data, reference_map());
88 set_reference_map(NULL);
89
90 MetadataFactory::free_array<jushort>(loader_data, operands());
91 set_operands(NULL);
92
93 release_C_heap_structures();
94
95 // free tag array
96 MetadataFactory::free_array<u1>(loader_data, tags());
97 set_tags(NULL);
98 }
99
100 void ConstantPool::release_C_heap_structures() {
101 // walk constant pool and decrement symbol reference counts
102 unreference_symbols();
103
104 delete _lock;
105 set_lock(NULL);
106 }
107
108 objArrayOop ConstantPool::resolved_references() const {
109 return (objArrayOop)JNIHandles::resolve(_resolved_references);
110 }
111
112 // Called from outside constant pool resolution where a resolved_reference array
113 // may not be present.
114 objArrayOop ConstantPool::resolved_references_or_null() const {
115 if (_cache == NULL) {
116 return NULL;
117 } else {
118 return (objArrayOop)JNIHandles::resolve(_resolved_references);
119 }
120 }
121
122 // Create resolved_references array and mapping array for original cp indexes
123 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
124 // to map it back for resolving and some unlikely miscellaneous uses.
125 // The objects created by invokedynamic are appended to this list.
126 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
127 intStack reference_map,
128 int constant_pool_map_length,
129 TRAPS) {
130 // Initialized the resolved object cache.
131 int map_length = reference_map.length();
132 if (map_length > 0) {
133 // Only need mapping back to constant pool entries. The map isn't used for
134 // invokedynamic resolved_reference entries. For invokedynamic entries,
135 // the constant pool cache index has the mapping back to both the constant
136 // pool and to the resolved reference index.
137 if (constant_pool_map_length > 0) {
138 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
139
140 for (int i = 0; i < constant_pool_map_length; i++) {
141 int x = reference_map.at(i);
142 assert(x == (int)(jushort) x, "klass index is too big");
143 om->at_put(i, (jushort)x);
144 }
145 set_reference_map(om);
146 }
147
148 // Create Java array for holding resolved strings, methodHandles,
149 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
150 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
151 Handle refs_handle (THREAD, (oop)stom); // must handleize.
152 set_resolved_references(loader_data->add_handle(refs_handle));
153 }
154 }
155
156 // CDS support. Create a new resolved_references array.
157 void ConstantPool::restore_unshareable_info(TRAPS) {
158
159 // Only create the new resolved references array and lock if it hasn't been
160 // attempted before
161 if (resolved_references() != NULL) return;
162
163 // restore the C++ vtable from the shared archive
164 restore_vtable();
165
166 if (SystemDictionary::Object_klass_loaded()) {
167 // Recreate the object array and add to ClassLoaderData.
168 int map_length = resolved_reference_length();
169 if (map_length > 0) {
170 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
171 Handle refs_handle (THREAD, (oop)stom); // must handleize.
172
173 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
174 set_resolved_references(loader_data->add_handle(refs_handle));
175 }
176
177 // Also need to recreate the mutex. Make sure this matches the constructor
178 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
179 }
180 }
181
182 void ConstantPool::remove_unshareable_info() {
183 // Resolved references are not in the shared archive.
184 // Save the length for restoration. It is not necessarily the same length
185 // as reference_map.length() if invokedynamic is saved.
186 set_resolved_reference_length(
187 resolved_references() != NULL ? resolved_references()->length() : 0);
188 set_resolved_references(NULL);
189 set_lock(NULL);
190 }
191
192 int ConstantPool::cp_to_object_index(int cp_index) {
193 // this is harder don't do this so much.
194 int i = reference_map()->find(cp_index);
195 // We might not find the index for jsr292 call.
196 return (i < 0) ? _no_index_sentinel : i;
197 }
198
199 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
200 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
201 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
202 // tag is not updated atomicly.
203
204 CPSlot entry = this_oop->slot_at(which);
205 if (entry.is_resolved()) {
206 assert(entry.get_klass()->is_klass(), "must be");
207 // Already resolved - return entry.
208 return entry.get_klass();
209 }
210
211 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
212 // already has updated the object
213 assert(THREAD->is_Java_thread(), "must be a Java thread");
214 bool do_resolve = false;
215 bool in_error = false;
216
217 // Create a handle for the mirror. This will preserve the resolved class
218 // until the loader_data is registered.
219 Handle mirror_handle;
220
221 Symbol* name = NULL;
222 Handle loader;
223 { MonitorLockerEx ml(this_oop->lock());
224
225 if (this_oop->tag_at(which).is_unresolved_klass()) {
226 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
227 in_error = true;
228 } else {
229 do_resolve = true;
230 name = this_oop->unresolved_klass_at(which);
231 loader = Handle(THREAD, this_oop->pool_holder()->class_loader());
232 }
233 }
234 } // unlocking constantPool
235
236
237 // The original attempt to resolve this constant pool entry failed so find the
238 // class of the original error and throw another error of the same class (JVMS 5.4.3).
239 // If there is a detail message, pass that detail message to the error constructor.
240 // The JVMS does not strictly require us to duplicate the same detail message,
241 // or any internal exception fields such as cause or stacktrace. But since the
242 // detail message is often a class name or other literal string, we will repeat it if
243 // we can find it in the symbol table.
244 if (in_error) {
245 throw_resolution_error(this_oop, which, CHECK_0);
246 }
247
248 if (do_resolve) {
249 // this_oop must be unlocked during resolve_or_fail
250 oop protection_domain = this_oop->pool_holder()->protection_domain();
251 Handle h_prot (THREAD, protection_domain);
252 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
253 KlassHandle k;
254 if (!HAS_PENDING_EXCEPTION) {
255 k = KlassHandle(THREAD, k_oop);
256 // preserve the resolved klass.
257 mirror_handle = Handle(THREAD, k_oop->java_mirror());
258 // Do access check for klasses
259 verify_constant_pool_resolve(this_oop, k, THREAD);
260 }
261
262 // Failed to resolve class. We must record the errors so that subsequent attempts
263 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
264 if (HAS_PENDING_EXCEPTION) {
265 MonitorLockerEx ml(this_oop->lock());
266
267 // some other thread has beaten us and has resolved the class.
268 if (this_oop->tag_at(which).is_klass()) {
269 CLEAR_PENDING_EXCEPTION;
270 entry = this_oop->resolved_klass_at(which);
271 return entry.get_klass();
272 }
273
274 // The tag could have changed to in-error before the lock but we have to
275 // handle that here for the class case.
276 save_and_throw_exception(this_oop, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_0);
277 }
278
279 if (TraceClassResolution && !k()->oop_is_array()) {
280 // skip resolving the constant pool so that this code get's
281 // called the next time some bytecodes refer to this class.
282 ResourceMark rm;
283 int line_number = -1;
284 const char * source_file = NULL;
285 if (JavaThread::current()->has_last_Java_frame()) {
286 // try to identify the method which called this function.
287 vframeStream vfst(JavaThread::current());
288 if (!vfst.at_end()) {
289 line_number = vfst.method()->line_number_from_bci(vfst.bci());
290 Symbol* s = vfst.method()->method_holder()->source_file_name();
291 if (s != NULL) {
292 source_file = s->as_C_string();
293 }
294 }
295 }
296 if (k() != this_oop->pool_holder()) {
297 // only print something if the classes are different
298 if (source_file != NULL) {
299 tty->print("RESOLVE %s %s %s:%d\n",
300 this_oop->pool_holder()->external_name(),
301 InstanceKlass::cast(k())->external_name(), source_file, line_number);
302 } else {
303 tty->print("RESOLVE %s %s\n",
304 this_oop->pool_holder()->external_name(),
305 InstanceKlass::cast(k())->external_name());
306 }
307 }
308 return k();
309 } else {
310 MonitorLockerEx ml(this_oop->lock());
311 // Only updated constant pool - if it is resolved.
312 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
313 if (do_resolve) {
314 this_oop->klass_at_put(which, k());
315 }
316 }
317 }
318
319 entry = this_oop->resolved_klass_at(which);
320 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
321 return entry.get_klass();
322 }
323
324
325 // Does not update ConstantPool* - to avoid any exception throwing. Used
326 // by compiler and exception handling. Also used to avoid classloads for
327 // instanceof operations. Returns NULL if the class has not been loaded or
328 // if the verification of constant pool failed
329 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
330 CPSlot entry = this_oop->slot_at(which);
331 if (entry.is_resolved()) {
332 assert(entry.get_klass()->is_klass(), "must be");
333 return entry.get_klass();
334 } else {
335 assert(entry.is_unresolved(), "must be either symbol or klass");
336 Thread *thread = Thread::current();
337 Symbol* name = entry.get_symbol();
338 oop loader = this_oop->pool_holder()->class_loader();
339 oop protection_domain = this_oop->pool_holder()->protection_domain();
340 Handle h_prot (thread, protection_domain);
341 Handle h_loader (thread, loader);
342 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
343
344 if (k != NULL) {
345 // Make sure that resolving is legal
346 EXCEPTION_MARK;
347 KlassHandle klass(THREAD, k);
348 // return NULL if verification fails
349 verify_constant_pool_resolve(this_oop, klass, THREAD);
350 if (HAS_PENDING_EXCEPTION) {
351 CLEAR_PENDING_EXCEPTION;
352 return NULL;
353 }
354 return klass();
355 } else {
356 return k;
357 }
358 }
359 }
360
361
362 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
363 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
364 }
365
366
367 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
368 int which) {
369 if (cpool->cache() == NULL) return NULL; // nothing to load yet
370 int cache_index = decode_cpcache_index(which, true);
371 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
372 // FIXME: should be an assert
373 if (PrintMiscellaneous && (Verbose||WizardMode)) {
374 tty->print_cr("bad operand %d in:", which); cpool->print();
375 }
376 return NULL;
377 }
378 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
379 return e->method_if_resolved(cpool);
380 }
381
382
383 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
384 if (cpool->cache() == NULL) return false; // 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->has_appendix();
388 }
389
390 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
391 if (cpool->cache() == NULL) return NULL; // nothing to load yet
392 int cache_index = decode_cpcache_index(which, true);
393 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
394 return e->appendix_if_resolved(cpool);
395 }
396
397
398 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) {
399 if (cpool->cache() == NULL) return false; // nothing to load yet
400 int cache_index = decode_cpcache_index(which, true);
401 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
402 return e->has_method_type();
403 }
404
405 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) {
406 if (cpool->cache() == NULL) return NULL; // nothing to load yet
407 int cache_index = decode_cpcache_index(which, true);
408 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
409 return e->method_type_if_resolved(cpool);
410 }
411
412
413 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
414 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
415 return symbol_at(name_index);
416 }
417
418
419 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
420 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
421 return symbol_at(signature_index);
422 }
423
424
425 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
426 int i = which;
427 if (!uncached && cache() != NULL) {
428 if (ConstantPool::is_invokedynamic_index(which)) {
429 // Invokedynamic index is index into resolved_references
430 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
431 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
432 assert(tag_at(pool_index).is_name_and_type(), "");
433 return pool_index;
434 }
435 // change byte-ordering and go via cache
436 i = remap_instruction_operand_from_cache(which);
437 } else {
438 if (tag_at(which).is_invoke_dynamic()) {
439 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
440 assert(tag_at(pool_index).is_name_and_type(), "");
441 return pool_index;
442 }
443 }
444 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
445 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
446 jint ref_index = *int_at_addr(i);
447 return extract_high_short_from_int(ref_index);
448 }
449
450
451 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
452 guarantee(!ConstantPool::is_invokedynamic_index(which),
453 "an invokedynamic instruction does not have a klass");
454 int i = which;
455 if (!uncached && cache() != NULL) {
456 // change byte-ordering and go via cache
457 i = remap_instruction_operand_from_cache(which);
458 }
459 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
460 jint ref_index = *int_at_addr(i);
461 return extract_low_short_from_int(ref_index);
462 }
463
464
465
466 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
467 int cpc_index = operand;
468 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
469 assert((int)(u2)cpc_index == cpc_index, "clean u2");
470 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
471 return member_index;
472 }
473
474
475 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
476 if (k->oop_is_instance() || k->oop_is_objArray()) {
477 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
478 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
479 KlassHandle element (THREAD, elem_oop);
480
481 // The element type could be a typeArray - we only need the access check if it is
482 // an reference to another class
483 if (element->oop_is_instance()) {
484 LinkResolver::check_klass_accessability(holder, element, CHECK);
485 }
486 }
487 }
488
489
490 int ConstantPool::name_ref_index_at(int which_nt) {
491 jint ref_index = name_and_type_at(which_nt);
492 return extract_low_short_from_int(ref_index);
493 }
494
495
496 int ConstantPool::signature_ref_index_at(int which_nt) {
497 jint ref_index = name_and_type_at(which_nt);
498 return extract_high_short_from_int(ref_index);
499 }
500
501
502 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
503 return klass_at(klass_ref_index_at(which), THREAD);
504 }
505
506
507 Symbol* ConstantPool::klass_name_at(int which) {
508 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
509 "Corrupted constant pool");
510 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
511 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
512 // tag is not updated atomicly.
513 CPSlot entry = slot_at(which);
514 if (entry.is_resolved()) {
515 // Already resolved - return entry's name.
516 assert(entry.get_klass()->is_klass(), "must be");
517 return entry.get_klass()->name();
518 } else {
519 assert(entry.is_unresolved(), "must be either symbol or klass");
520 return entry.get_symbol();
521 }
522 }
523
524 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
525 jint ref_index = klass_ref_index_at(which);
526 return klass_at_noresolve(ref_index);
527 }
528
529 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
530 jint ref_index = uncached_klass_ref_index_at(which);
531 return klass_at_noresolve(ref_index);
532 }
533
534 char* ConstantPool::string_at_noresolve(int which) {
535 Symbol* s = unresolved_string_at(which);
536 if (s == NULL) {
537 return (char*)"<pseudo-string>";
538 } else {
539 return unresolved_string_at(which)->as_C_string();
540 }
541 }
542
543 BasicType ConstantPool::basic_type_for_signature_at(int which) {
544 return FieldType::basic_type(symbol_at(which));
545 }
546
547
548 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
549 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
550 if (this_oop->tag_at(index).is_string()) {
551 this_oop->string_at(index, CHECK);
552 }
553 }
554 }
555
556 // Resolve all the classes in the constant pool. If they are all resolved,
557 // the constant pool is read-only. Enhancement: allocate cp entries to
558 // another metaspace, and copy to read-only or read-write space if this
559 // bit is set.
560 bool ConstantPool::resolve_class_constants(TRAPS) {
561 constantPoolHandle cp(THREAD, this);
562 for (int index = 1; index < length(); index++) { // Index 0 is unused
563 if (tag_at(index).is_unresolved_klass() &&
564 klass_at_if_loaded(cp, index) == NULL) {
565 return false;
566 }
567 }
568 // set_preresolution(); or some bit for future use
569 return true;
570 }
571
572 Symbol* ConstantPool::exception_message(constantPoolHandle this_oop, int which, constantTag tag, oop pending_exception) {
573 // Dig out the detailed message to reuse if possible
574 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
575 if (message != NULL) {
576 return message;
577 }
578
579 // Return specific message for the tag
580 switch (tag.value()) {
581 case JVM_CONSTANT_UnresolvedClass:
582 // return the class name in the error message
583 message = this_oop->unresolved_klass_at(which);
584 break;
585 case JVM_CONSTANT_MethodHandle:
586 // return the method handle name in the error message
587 message = this_oop->method_handle_name_ref_at(which);
588 break;
589 case JVM_CONSTANT_MethodType:
590 // return the method type signature in the error message
591 message = this_oop->method_type_signature_at(which);
592 break;
593 default:
594 ShouldNotReachHere();
595 }
596
597 return message;
598 }
599
600 void ConstantPool::throw_resolution_error(constantPoolHandle this_oop, int which, TRAPS) {
601 Symbol* message = NULL;
602 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which, &message);
603 assert(error != NULL && message != NULL, "checking");
604 CLEAR_PENDING_EXCEPTION;
605 ResourceMark rm;
606 THROW_MSG(error, message->as_C_string());
607 }
608
609 // If resolution for Class, MethodHandle or MethodType fails, save the exception
610 // in the resolution error table, so that the same exception is thrown again.
611 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
612 constantTag tag, TRAPS) {
613 assert(this_oop->lock()->is_locked(), "constant pool lock should be held");
614 Symbol* error = PENDING_EXCEPTION->klass()->name();
615
616 int error_tag = tag.error_value();
617
618 if (!PENDING_EXCEPTION->
619 is_a(SystemDictionary::LinkageError_klass())) {
620 // Just throw the exception and don't prevent these classes from
621 // being loaded due to virtual machine errors like StackOverflow
622 // and OutOfMemoryError, etc, or if the thread was hit by stop()
623 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
624 } else if (this_oop->tag_at(which).value() != error_tag) {
625 Symbol* message = exception_message(this_oop, which, tag, PENDING_EXCEPTION);
626 SystemDictionary::add_resolution_error(this_oop, which, error, message);
627 this_oop->tag_at_put(which, error_tag);
628 } else {
629 // some other thread put this in error state
630 throw_resolution_error(this_oop, which, CHECK);
631 }
632
633 // This exits with some pending exception
634 assert(HAS_PENDING_EXCEPTION, "should not be cleared");
635 }
636
637
638
639 // Called to resolve constants in the constant pool and return an oop.
640 // Some constant pool entries cache their resolved oop. This is also
641 // called to create oops from constants to use in arguments for invokedynamic
642 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
643 oop result_oop = NULL;
644 Handle throw_exception;
645
646 if (cache_index == _possible_index_sentinel) {
647 // It is possible that this constant is one which is cached in the objects.
648 // We'll do a linear search. This should be OK because this usage is rare.
649 assert(index > 0, "valid index");
650 cache_index = this_oop->cp_to_object_index(index);
651 }
652 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
653 assert(index == _no_index_sentinel || index >= 0, "");
654
655 if (cache_index >= 0) {
656 result_oop = this_oop->resolved_references()->obj_at(cache_index);
657 if (result_oop != NULL) {
658 return result_oop;
659 // That was easy...
660 }
661 index = this_oop->object_to_cp_index(cache_index);
662 }
663
664 jvalue prim_value; // temp used only in a few cases below
665
666 constantTag tag = this_oop->tag_at(index);
667
668 switch (tag.value()) {
669
670 case JVM_CONSTANT_UnresolvedClass:
671 case JVM_CONSTANT_UnresolvedClassInError:
672 case JVM_CONSTANT_Class:
673 {
674 assert(cache_index == _no_index_sentinel, "should not have been set");
675 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
676 // ldc wants the java mirror.
677 result_oop = resolved->java_mirror();
678 break;
679 }
680
681 case JVM_CONSTANT_String:
682 assert(cache_index != _no_index_sentinel, "should have been set");
683 if (this_oop->is_pseudo_string_at(index)) {
684 result_oop = this_oop->pseudo_string_at(index, cache_index);
685 break;
686 }
687 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
688 break;
689
690 case JVM_CONSTANT_MethodHandleInError:
691 case JVM_CONSTANT_MethodTypeInError:
692 {
693 throw_resolution_error(this_oop, index, CHECK_NULL);
694 break;
695 }
696
697 case JVM_CONSTANT_MethodHandle:
698 {
699 int ref_kind = this_oop->method_handle_ref_kind_at(index);
700 int callee_index = this_oop->method_handle_klass_index_at(index);
701 Symbol* name = this_oop->method_handle_name_ref_at(index);
702 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
703 if (PrintMiscellaneous)
704 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
705 ref_kind, index, this_oop->method_handle_index_at(index),
706 callee_index, name->as_C_string(), signature->as_C_string());
707 KlassHandle callee;
708 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
709 callee = KlassHandle(THREAD, k);
710 }
711 KlassHandle klass(THREAD, this_oop->pool_holder());
712 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
713 callee, name, signature,
714 THREAD);
715 result_oop = value();
716 if (HAS_PENDING_EXCEPTION) {
717 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag.
718 save_and_throw_exception(this_oop, index, tag, CHECK_NULL);
719 }
720 break;
721 }
722
723 case JVM_CONSTANT_MethodType:
724 {
725 Symbol* signature = this_oop->method_type_signature_at(index);
726 if (PrintMiscellaneous)
727 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
728 index, this_oop->method_type_index_at(index),
729 signature->as_C_string());
730 KlassHandle klass(THREAD, this_oop->pool_holder());
731 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
732 result_oop = value();
733 if (HAS_PENDING_EXCEPTION) {
734 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag.
735 save_and_throw_exception(this_oop, index, tag, CHECK_NULL);
736 }
737 break;
738 }
739
740 case JVM_CONSTANT_Integer:
741 assert(cache_index == _no_index_sentinel, "should not have been set");
742 prim_value.i = this_oop->int_at(index);
743 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
744 break;
745
746 case JVM_CONSTANT_Float:
747 assert(cache_index == _no_index_sentinel, "should not have been set");
748 prim_value.f = this_oop->float_at(index);
749 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
750 break;
751
752 case JVM_CONSTANT_Long:
753 assert(cache_index == _no_index_sentinel, "should not have been set");
754 prim_value.j = this_oop->long_at(index);
755 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
756 break;
757
758 case JVM_CONSTANT_Double:
759 assert(cache_index == _no_index_sentinel, "should not have been set");
760 prim_value.d = this_oop->double_at(index);
761 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
762 break;
763
764 default:
765 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
766 this_oop(), index, cache_index, tag.value()));
767 assert(false, "unexpected constant tag");
768 break;
769 }
770
771 if (cache_index >= 0) {
772 // Cache the oop here also.
773 Handle result_handle(THREAD, result_oop);
774 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this
775 oop result = this_oop->resolved_references()->obj_at(cache_index);
776 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
777 // The important thing here is that all threads pick up the same result.
778 // It doesn't matter which racing thread wins, as long as only one
779 // result is used by all threads, and all future queries.
780 // That result may be either a resolved constant or a failure exception.
781 if (result == NULL) {
782 this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
783 return result_handle();
784 } else {
785 // Return the winning thread's result. This can be different than
786 // result_handle() for MethodHandles.
787 return result;
788 }
789 } else {
790 return result_oop;
791 }
792 }
793
794 oop ConstantPool::uncached_string_at(int which, TRAPS) {
795 Symbol* sym = unresolved_string_at(which);
796 oop str = StringTable::intern(sym, CHECK_(NULL));
797 assert(java_lang_String::is_instance(str), "must be string");
798 return str;
799 }
800
801
802 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
803 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
804
805 Handle bsm;
806 int argc;
807 {
808 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
809 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
810 // It is accompanied by the optional arguments.
811 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
812 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
813 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
814 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
815 }
816
817 // Extract the optional static arguments.
818 argc = this_oop->invoke_dynamic_argument_count_at(index);
819 if (argc == 0) return bsm_oop;
820
821 bsm = Handle(THREAD, bsm_oop);
822 }
823
824 objArrayHandle info;
825 {
826 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
827 info = objArrayHandle(THREAD, info_oop);
828 }
829
830 info->obj_at_put(0, bsm());
831 for (int i = 0; i < argc; i++) {
832 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
833 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
834 info->obj_at_put(1+i, arg_oop);
835 }
836
837 return info();
838 }
839
840 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
841 // If the string has already been interned, this entry will be non-null
842 oop str = this_oop->resolved_references()->obj_at(obj_index);
843 if (str != NULL) return str;
844 Symbol* sym = this_oop->unresolved_string_at(which);
845 str = StringTable::intern(sym, CHECK_(NULL));
846 this_oop->string_at_put(which, obj_index, str);
847 assert(java_lang_String::is_instance(str), "must be string");
848 return str;
849 }
850
851
852 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
853 int which) {
854 // Names are interned, so we can compare Symbol*s directly
855 Symbol* cp_name = klass_name_at(which);
856 return (cp_name == k->name());
857 }
858
859
860 // Iterate over symbols and decrement ones which are Symbol*s.
861 // This is done during GC so do not need to lock constantPool unless we
862 // have per-thread safepoints.
863 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
864 // these symbols but didn't increment the reference count.
865 void ConstantPool::unreference_symbols() {
866 for (int index = 1; index < length(); index++) { // Index 0 is unused
867 constantTag tag = tag_at(index);
868 if (tag.is_symbol()) {
869 symbol_at(index)->decrement_refcount();
870 }
871 }
872 }
873
874
875 // Compare this constant pool's entry at index1 to the constant pool
876 // cp2's entry at index2.
877 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
878 int index2, TRAPS) {
879
880 // The error tags are equivalent to non-error tags when comparing
881 jbyte t1 = tag_at(index1).non_error_value();
882 jbyte t2 = cp2->tag_at(index2).non_error_value();
883
884 if (t1 != t2) {
885 // Not the same entry type so there is nothing else to check. Note
886 // that this style of checking will consider resolved/unresolved
887 // class pairs as different.
888 // From the ConstantPool* API point of view, this is correct
889 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
890 // plays out in the context of ConstantPool* merging.
891 return false;
892 }
893
894 switch (t1) {
895 case JVM_CONSTANT_Class:
896 {
897 Klass* k1 = klass_at(index1, CHECK_false);
898 Klass* k2 = cp2->klass_at(index2, CHECK_false);
899 if (k1 == k2) {
900 return true;
901 }
902 } break;
903
904 case JVM_CONSTANT_ClassIndex:
905 {
906 int recur1 = klass_index_at(index1);
907 int recur2 = cp2->klass_index_at(index2);
908 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
909 if (match) {
910 return true;
911 }
912 } break;
913
914 case JVM_CONSTANT_Double:
915 {
916 jdouble d1 = double_at(index1);
917 jdouble d2 = cp2->double_at(index2);
918 if (d1 == d2) {
919 return true;
920 }
921 } break;
922
923 case JVM_CONSTANT_Fieldref:
924 case JVM_CONSTANT_InterfaceMethodref:
925 case JVM_CONSTANT_Methodref:
926 {
927 int recur1 = uncached_klass_ref_index_at(index1);
928 int recur2 = cp2->uncached_klass_ref_index_at(index2);
929 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
930 if (match) {
931 recur1 = uncached_name_and_type_ref_index_at(index1);
932 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
933 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
934 if (match) {
935 return true;
936 }
937 }
938 } break;
939
940 case JVM_CONSTANT_Float:
941 {
942 jfloat f1 = float_at(index1);
943 jfloat f2 = cp2->float_at(index2);
944 if (f1 == f2) {
945 return true;
946 }
947 } break;
948
949 case JVM_CONSTANT_Integer:
950 {
951 jint i1 = int_at(index1);
952 jint i2 = cp2->int_at(index2);
953 if (i1 == i2) {
954 return true;
955 }
956 } break;
957
958 case JVM_CONSTANT_Long:
959 {
960 jlong l1 = long_at(index1);
961 jlong l2 = cp2->long_at(index2);
962 if (l1 == l2) {
963 return true;
964 }
965 } break;
966
967 case JVM_CONSTANT_NameAndType:
968 {
969 int recur1 = name_ref_index_at(index1);
970 int recur2 = cp2->name_ref_index_at(index2);
971 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
972 if (match) {
973 recur1 = signature_ref_index_at(index1);
974 recur2 = cp2->signature_ref_index_at(index2);
975 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
976 if (match) {
977 return true;
978 }
979 }
980 } break;
981
982 case JVM_CONSTANT_StringIndex:
983 {
984 int recur1 = string_index_at(index1);
985 int recur2 = cp2->string_index_at(index2);
986 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
987 if (match) {
988 return true;
989 }
990 } break;
991
992 case JVM_CONSTANT_UnresolvedClass:
993 {
994 Symbol* k1 = unresolved_klass_at(index1);
995 Symbol* k2 = cp2->unresolved_klass_at(index2);
996 if (k1 == k2) {
997 return true;
998 }
999 } break;
1000
1001 case JVM_CONSTANT_MethodType:
1002 {
1003 int k1 = method_type_index_at_error_ok(index1);
1004 int k2 = cp2->method_type_index_at_error_ok(index2);
1005 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1006 if (match) {
1007 return true;
1008 }
1009 } break;
1010
1011 case JVM_CONSTANT_MethodHandle:
1012 {
1013 int k1 = method_handle_ref_kind_at_error_ok(index1);
1014 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2);
1015 if (k1 == k2) {
1016 int i1 = method_handle_index_at_error_ok(index1);
1017 int i2 = cp2->method_handle_index_at_error_ok(index2);
1018 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1019 if (match) {
1020 return true;
1021 }
1022 }
1023 } break;
1024
1025 case JVM_CONSTANT_InvokeDynamic:
1026 {
1027 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1028 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1029 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1030 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1031 // separate statements and variables because CHECK_false is used
1032 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1033 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1034 return (match_entry && match_operand);
1035 } break;
1036
1037 case JVM_CONSTANT_String:
1038 {
1039 Symbol* s1 = unresolved_string_at(index1);
1040 Symbol* s2 = cp2->unresolved_string_at(index2);
1041 if (s1 == s2) {
1042 return true;
1043 }
1044 } break;
1045
1046 case JVM_CONSTANT_Utf8:
1047 {
1048 Symbol* s1 = symbol_at(index1);
1049 Symbol* s2 = cp2->symbol_at(index2);
1050 if (s1 == s2) {
1051 return true;
1052 }
1053 } break;
1054
1055 // Invalid is used as the tag for the second constant pool entry
1056 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1057 // not be seen by itself.
1058 case JVM_CONSTANT_Invalid: // fall through
1059
1060 default:
1061 ShouldNotReachHere();
1062 break;
1063 }
1064
1065 return false;
1066 } // end compare_entry_to()
1067
1068
1069 // Resize the operands array with delta_len and delta_size.
1070 // Used in RedefineClasses for CP merge.
1071 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1072 int old_len = operand_array_length(operands());
1073 int new_len = old_len + delta_len;
1074 int min_len = (delta_len > 0) ? old_len : new_len;
1075
1076 int old_size = operands()->length();
1077 int new_size = old_size + delta_size;
1078 int min_size = (delta_size > 0) ? old_size : new_size;
1079
1080 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1081 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1082
1083 // Set index in the resized array for existing elements only
1084 for (int idx = 0; idx < min_len; idx++) {
1085 int offset = operand_offset_at(idx); // offset in original array
1086 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1087 }
1088 // Copy the bootstrap specifiers only
1089 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1090 new_ops->adr_at(2*new_len),
1091 (min_size - 2*min_len) * sizeof(u2));
1092 // Explicitly deallocate old operands array.
1093 // Note, it is not needed for 7u backport.
1094 if ( operands() != NULL) { // the safety check
1095 MetadataFactory::free_array<u2>(loader_data, operands());
1096 }
1097 set_operands(new_ops);
1098 } // end resize_operands()
1099
1100
1101 // Extend the operands array with the length and size of the ext_cp operands.
1102 // Used in RedefineClasses for CP merge.
1103 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) {
1104 int delta_len = operand_array_length(ext_cp->operands());
1105 if (delta_len == 0) {
1106 return; // nothing to do
1107 }
1108 int delta_size = ext_cp->operands()->length();
1109
1110 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1111
1112 if (operand_array_length(operands()) == 0) {
1113 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1114 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1115 // The first element index defines the offset of second part
1116 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1117 set_operands(new_ops);
1118 } else {
1119 resize_operands(delta_len, delta_size, CHECK);
1120 }
1121
1122 } // end extend_operands()
1123
1124
1125 // Shrink the operands array to a smaller array with new_len length.
1126 // Used in RedefineClasses for CP merge.
1127 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1128 int old_len = operand_array_length(operands());
1129 if (new_len == old_len) {
1130 return; // nothing to do
1131 }
1132 assert(new_len < old_len, "shrunken operands array must be smaller");
1133
1134 int free_base = operand_next_offset_at(new_len - 1);
1135 int delta_len = new_len - old_len;
1136 int delta_size = 2*delta_len + free_base - operands()->length();
1137
1138 resize_operands(delta_len, delta_size, CHECK);
1139
1140 } // end shrink_operands()
1141
1142
1143 void ConstantPool::copy_operands(constantPoolHandle from_cp,
1144 constantPoolHandle to_cp,
1145 TRAPS) {
1146
1147 int from_oplen = operand_array_length(from_cp->operands());
1148 int old_oplen = operand_array_length(to_cp->operands());
1149 if (from_oplen != 0) {
1150 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1151 // append my operands to the target's operands array
1152 if (old_oplen == 0) {
1153 // Can't just reuse from_cp's operand list because of deallocation issues
1154 int len = from_cp->operands()->length();
1155 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1156 Copy::conjoint_memory_atomic(
1157 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1158 to_cp->set_operands(new_ops);
1159 } else {
1160 int old_len = to_cp->operands()->length();
1161 int from_len = from_cp->operands()->length();
1162 int old_off = old_oplen * sizeof(u2);
1163 int from_off = from_oplen * sizeof(u2);
1164 // Use the metaspace for the destination constant pool
1165 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1166 int fillp = 0, len = 0;
1167 // first part of dest
1168 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1169 new_operands->adr_at(fillp),
1170 (len = old_off) * sizeof(u2));
1171 fillp += len;
1172 // first part of src
1173 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1174 new_operands->adr_at(fillp),
1175 (len = from_off) * sizeof(u2));
1176 fillp += len;
1177 // second part of dest
1178 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1179 new_operands->adr_at(fillp),
1180 (len = old_len - old_off) * sizeof(u2));
1181 fillp += len;
1182 // second part of src
1183 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1184 new_operands->adr_at(fillp),
1185 (len = from_len - from_off) * sizeof(u2));
1186 fillp += len;
1187 assert(fillp == new_operands->length(), "");
1188
1189 // Adjust indexes in the first part of the copied operands array.
1190 for (int j = 0; j < from_oplen; j++) {
1191 int offset = operand_offset_at(new_operands, old_oplen + j);
1192 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1193 offset += old_len; // every new tuple is preceded by old_len extra u2's
1194 operand_offset_at_put(new_operands, old_oplen + j, offset);
1195 }
1196
1197 // replace target operands array with combined array
1198 to_cp->set_operands(new_operands);
1199 }
1200 }
1201 } // end copy_operands()
1202
1203
1204 // Copy this constant pool's entries at start_i to end_i (inclusive)
1205 // to the constant pool to_cp's entries starting at to_i. A total of
1206 // (end_i - start_i) + 1 entries are copied.
1207 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1208 constantPoolHandle to_cp, int to_i, TRAPS) {
1209
1210
1211 int dest_i = to_i; // leave original alone for debug purposes
1212
1213 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1214 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1215
1216 switch (from_cp->tag_at(src_i).value()) {
1217 case JVM_CONSTANT_Double:
1218 case JVM_CONSTANT_Long:
1219 // double and long take two constant pool entries
1220 src_i += 2;
1221 dest_i += 2;
1222 break;
1223
1224 default:
1225 // all others take one constant pool entry
1226 src_i++;
1227 dest_i++;
1228 break;
1229 }
1230 }
1231 copy_operands(from_cp, to_cp, CHECK);
1232
1233 } // end copy_cp_to_impl()
1234
1235
1236 // Copy this constant pool's entry at from_i to the constant pool
1237 // to_cp's entry at to_i.
1238 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1239 constantPoolHandle to_cp, int to_i,
1240 TRAPS) {
1241
1242 int tag = from_cp->tag_at(from_i).value();
1243 switch (tag) {
1244 case JVM_CONSTANT_Class:
1245 {
1246 Klass* k = from_cp->klass_at(from_i, CHECK);
1247 to_cp->klass_at_put(to_i, k);
1248 } break;
1249
1250 case JVM_CONSTANT_ClassIndex:
1251 {
1252 jint ki = from_cp->klass_index_at(from_i);
1253 to_cp->klass_index_at_put(to_i, ki);
1254 } break;
1255
1256 case JVM_CONSTANT_Double:
1257 {
1258 jdouble d = from_cp->double_at(from_i);
1259 to_cp->double_at_put(to_i, d);
1260 // double takes two constant pool entries so init second entry's tag
1261 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1262 } break;
1263
1264 case JVM_CONSTANT_Fieldref:
1265 {
1266 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1267 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1268 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1269 } break;
1270
1271 case JVM_CONSTANT_Float:
1272 {
1273 jfloat f = from_cp->float_at(from_i);
1274 to_cp->float_at_put(to_i, f);
1275 } break;
1276
1277 case JVM_CONSTANT_Integer:
1278 {
1279 jint i = from_cp->int_at(from_i);
1280 to_cp->int_at_put(to_i, i);
1281 } break;
1282
1283 case JVM_CONSTANT_InterfaceMethodref:
1284 {
1285 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1286 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1287 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1288 } break;
1289
1290 case JVM_CONSTANT_Long:
1291 {
1292 jlong l = from_cp->long_at(from_i);
1293 to_cp->long_at_put(to_i, l);
1294 // long takes two constant pool entries so init second entry's tag
1295 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1296 } break;
1297
1298 case JVM_CONSTANT_Methodref:
1299 {
1300 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1301 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1302 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1303 } break;
1304
1305 case JVM_CONSTANT_NameAndType:
1306 {
1307 int name_ref_index = from_cp->name_ref_index_at(from_i);
1308 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1309 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1310 } break;
1311
1312 case JVM_CONSTANT_StringIndex:
1313 {
1314 jint si = from_cp->string_index_at(from_i);
1315 to_cp->string_index_at_put(to_i, si);
1316 } break;
1317
1318 case JVM_CONSTANT_UnresolvedClass:
1319 case JVM_CONSTANT_UnresolvedClassInError:
1320 {
1321 // Can be resolved after checking tag, so check the slot first.
1322 CPSlot entry = from_cp->slot_at(from_i);
1323 if (entry.is_resolved()) {
1324 assert(entry.get_klass()->is_klass(), "must be");
1325 // Already resolved
1326 to_cp->klass_at_put(to_i, entry.get_klass());
1327 } else {
1328 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1329 }
1330 } break;
1331
1332 case JVM_CONSTANT_String:
1333 {
1334 Symbol* s = from_cp->unresolved_string_at(from_i);
1335 to_cp->unresolved_string_at_put(to_i, s);
1336 } break;
1337
1338 case JVM_CONSTANT_Utf8:
1339 {
1340 Symbol* s = from_cp->symbol_at(from_i);
1341 // Need to increase refcount, the old one will be thrown away and deferenced
1342 s->increment_refcount();
1343 to_cp->symbol_at_put(to_i, s);
1344 } break;
1345
1346 case JVM_CONSTANT_MethodType:
1347 case JVM_CONSTANT_MethodTypeInError:
1348 {
1349 jint k = from_cp->method_type_index_at_error_ok(from_i);
1350 to_cp->method_type_index_at_put(to_i, k);
1351 } break;
1352
1353 case JVM_CONSTANT_MethodHandle:
1354 case JVM_CONSTANT_MethodHandleInError:
1355 {
1356 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i);
1357 int k2 = from_cp->method_handle_index_at_error_ok(from_i);
1358 to_cp->method_handle_index_at_put(to_i, k1, k2);
1359 } break;
1360
1361 case JVM_CONSTANT_InvokeDynamic:
1362 {
1363 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1364 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1365 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1366 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1367 } break;
1368
1369 // Invalid is used as the tag for the second constant pool entry
1370 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1371 // not be seen by itself.
1372 case JVM_CONSTANT_Invalid: // fall through
1373
1374 default:
1375 {
1376 ShouldNotReachHere();
1377 } break;
1378 }
1379 } // end copy_entry_to()
1380
1381
1382 // Search constant pool search_cp for an entry that matches this
1383 // constant pool's entry at pattern_i. Returns the index of a
1384 // matching entry or zero (0) if there is no matching entry.
1385 int ConstantPool::find_matching_entry(int pattern_i,
1386 constantPoolHandle search_cp, TRAPS) {
1387
1388 // index zero (0) is not used
1389 for (int i = 1; i < search_cp->length(); i++) {
1390 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1391 if (found) {
1392 return i;
1393 }
1394 }
1395
1396 return 0; // entry not found; return unused index zero (0)
1397 } // end find_matching_entry()
1398
1399
1400 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1401 // cp2's bootstrap specifier at idx2.
1402 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) {
1403 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1404 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1405 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1406
1407 if (!match) {
1408 return false;
1409 }
1410 int argc = operand_argument_count_at(idx1);
1411 if (argc == cp2->operand_argument_count_at(idx2)) {
1412 for (int j = 0; j < argc; j++) {
1413 k1 = operand_argument_index_at(idx1, j);
1414 k2 = cp2->operand_argument_index_at(idx2, j);
1415 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1416 if (!match) {
1417 return false;
1418 }
1419 }
1420 return true; // got through loop; all elements equal
1421 }
1422 return false;
1423 } // end compare_operand_to()
1424
1425 // Search constant pool search_cp for a bootstrap specifier that matches
1426 // this constant pool's bootstrap specifier at pattern_i index.
1427 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1428 int ConstantPool::find_matching_operand(int pattern_i,
1429 constantPoolHandle search_cp, int search_len, TRAPS) {
1430 for (int i = 0; i < search_len; i++) {
1431 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1432 if (found) {
1433 return i;
1434 }
1435 }
1436 return -1; // bootstrap specifier not found; return unused index (-1)
1437 } // end find_matching_operand()
1438
1439
1440 #ifndef PRODUCT
1441
1442 const char* ConstantPool::printable_name_at(int which) {
1443
1444 constantTag tag = tag_at(which);
1445
1446 if (tag.is_string()) {
1447 return string_at_noresolve(which);
1448 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1449 return klass_name_at(which)->as_C_string();
1450 } else if (tag.is_symbol()) {
1451 return symbol_at(which)->as_C_string();
1452 }
1453 return "";
1454 }
1455
1456 #endif // PRODUCT
1457
1458
1459 // JVMTI GetConstantPool support
1460
1461 // For debugging of constant pool
1462 const bool debug_cpool = false;
1463
1464 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1465
1466 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1467 const char* WARN_MSG = "Must not be such entry!";
1468 jint size = 0;
1469 u2 idx1, idx2;
1470
1471 for (jint idx = 1; idx < cnt; idx++) {
1472 jint ent_size = 0;
1473 u1 tag = *bytes++;
1474 size++; // count tag
1475
1476 printf("const #%03d, tag: %02d ", idx, tag);
1477 switch(tag) {
1478 case JVM_CONSTANT_Invalid: {
1479 printf("Invalid");
1480 break;
1481 }
1482 case JVM_CONSTANT_Unicode: {
1483 printf("Unicode %s", WARN_MSG);
1484 break;
1485 }
1486 case JVM_CONSTANT_Utf8: {
1487 u2 len = Bytes::get_Java_u2(bytes);
1488 char str[128];
1489 if (len > 127) {
1490 len = 127;
1491 }
1492 strncpy(str, (char *) (bytes+2), len);
1493 str[len] = '\0';
1494 printf("Utf8 \"%s\"", str);
1495 ent_size = 2 + len;
1496 break;
1497 }
1498 case JVM_CONSTANT_Integer: {
1499 u4 val = Bytes::get_Java_u4(bytes);
1500 printf("int %d", *(int *) &val);
1501 ent_size = 4;
1502 break;
1503 }
1504 case JVM_CONSTANT_Float: {
1505 u4 val = Bytes::get_Java_u4(bytes);
1506 printf("float %5.3ff", *(float *) &val);
1507 ent_size = 4;
1508 break;
1509 }
1510 case JVM_CONSTANT_Long: {
1511 u8 val = Bytes::get_Java_u8(bytes);
1512 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1513 ent_size = 8;
1514 idx++; // Long takes two cpool slots
1515 break;
1516 }
1517 case JVM_CONSTANT_Double: {
1518 u8 val = Bytes::get_Java_u8(bytes);
1519 printf("double %5.3fd", *(jdouble *)&val);
1520 ent_size = 8;
1521 idx++; // Double takes two cpool slots
1522 break;
1523 }
1524 case JVM_CONSTANT_Class: {
1525 idx1 = Bytes::get_Java_u2(bytes);
1526 printf("class #%03d", idx1);
1527 ent_size = 2;
1528 break;
1529 }
1530 case JVM_CONSTANT_String: {
1531 idx1 = Bytes::get_Java_u2(bytes);
1532 printf("String #%03d", idx1);
1533 ent_size = 2;
1534 break;
1535 }
1536 case JVM_CONSTANT_Fieldref: {
1537 idx1 = Bytes::get_Java_u2(bytes);
1538 idx2 = Bytes::get_Java_u2(bytes+2);
1539 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1540 ent_size = 4;
1541 break;
1542 }
1543 case JVM_CONSTANT_Methodref: {
1544 idx1 = Bytes::get_Java_u2(bytes);
1545 idx2 = Bytes::get_Java_u2(bytes+2);
1546 printf("Method #%03d, #%03d", idx1, idx2);
1547 ent_size = 4;
1548 break;
1549 }
1550 case JVM_CONSTANT_InterfaceMethodref: {
1551 idx1 = Bytes::get_Java_u2(bytes);
1552 idx2 = Bytes::get_Java_u2(bytes+2);
1553 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1554 ent_size = 4;
1555 break;
1556 }
1557 case JVM_CONSTANT_NameAndType: {
1558 idx1 = Bytes::get_Java_u2(bytes);
1559 idx2 = Bytes::get_Java_u2(bytes+2);
1560 printf("NameAndType #%03d, #%03d", idx1, idx2);
1561 ent_size = 4;
1562 break;
1563 }
1564 case JVM_CONSTANT_ClassIndex: {
1565 printf("ClassIndex %s", WARN_MSG);
1566 break;
1567 }
1568 case JVM_CONSTANT_UnresolvedClass: {
1569 printf("UnresolvedClass: %s", WARN_MSG);
1570 break;
1571 }
1572 case JVM_CONSTANT_UnresolvedClassInError: {
1573 printf("UnresolvedClassInErr: %s", WARN_MSG);
1574 break;
1575 }
1576 case JVM_CONSTANT_StringIndex: {
1577 printf("StringIndex: %s", WARN_MSG);
1578 break;
1579 }
1580 }
1581 printf(";\n");
1582 bytes += ent_size;
1583 size += ent_size;
1584 }
1585 printf("Cpool size: %d\n", size);
1586 fflush(0);
1587 return;
1588 } /* end print_cpool_bytes */
1589
1590
1591 // Returns size of constant pool entry.
1592 jint ConstantPool::cpool_entry_size(jint idx) {
1593 switch(tag_at(idx).value()) {
1594 case JVM_CONSTANT_Invalid:
1595 case JVM_CONSTANT_Unicode:
1596 return 1;
1597
1598 case JVM_CONSTANT_Utf8:
1599 return 3 + symbol_at(idx)->utf8_length();
1600
1601 case JVM_CONSTANT_Class:
1602 case JVM_CONSTANT_String:
1603 case JVM_CONSTANT_ClassIndex:
1604 case JVM_CONSTANT_UnresolvedClass:
1605 case JVM_CONSTANT_UnresolvedClassInError:
1606 case JVM_CONSTANT_StringIndex:
1607 case JVM_CONSTANT_MethodType:
1608 case JVM_CONSTANT_MethodTypeInError:
1609 return 3;
1610
1611 case JVM_CONSTANT_MethodHandle:
1612 case JVM_CONSTANT_MethodHandleInError:
1613 return 4; //tag, ref_kind, ref_index
1614
1615 case JVM_CONSTANT_Integer:
1616 case JVM_CONSTANT_Float:
1617 case JVM_CONSTANT_Fieldref:
1618 case JVM_CONSTANT_Methodref:
1619 case JVM_CONSTANT_InterfaceMethodref:
1620 case JVM_CONSTANT_NameAndType:
1621 return 5;
1622
1623 case JVM_CONSTANT_InvokeDynamic:
1624 // u1 tag, u2 bsm, u2 nt
1625 return 5;
1626
1627 case JVM_CONSTANT_Long:
1628 case JVM_CONSTANT_Double:
1629 return 9;
1630 }
1631 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1632 return 1;
1633 } /* end cpool_entry_size */
1634
1635
1636 // SymbolHashMap is used to find a constant pool index from a string.
1637 // This function fills in SymbolHashMaps, one for utf8s and one for
1638 // class names, returns size of the cpool raw bytes.
1639 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1640 SymbolHashMap *classmap) {
1641 jint size = 0;
1642
1643 for (u2 idx = 1; idx < length(); idx++) {
1644 u2 tag = tag_at(idx).value();
1645 size += cpool_entry_size(idx);
1646
1647 switch(tag) {
1648 case JVM_CONSTANT_Utf8: {
1649 Symbol* sym = symbol_at(idx);
1650 symmap->add_entry(sym, idx);
1651 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1652 break;
1653 }
1654 case JVM_CONSTANT_Class:
1655 case JVM_CONSTANT_UnresolvedClass:
1656 case JVM_CONSTANT_UnresolvedClassInError: {
1657 Symbol* sym = klass_name_at(idx);
1658 classmap->add_entry(sym, idx);
1659 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1660 break;
1661 }
1662 case JVM_CONSTANT_Long:
1663 case JVM_CONSTANT_Double: {
1664 idx++; // Both Long and Double take two cpool slots
1665 break;
1666 }
1667 }
1668 }
1669 return size;
1670 } /* end hash_utf8_entries_to */
1671
1672
1673 // Copy cpool bytes.
1674 // Returns:
1675 // 0, in case of OutOfMemoryError
1676 // -1, in case of internal error
1677 // > 0, count of the raw cpool bytes that have been copied
1678 int ConstantPool::copy_cpool_bytes(int cpool_size,
1679 SymbolHashMap* tbl,
1680 unsigned char *bytes) {
1681 u2 idx1, idx2;
1682 jint size = 0;
1683 jint cnt = length();
1684 unsigned char *start_bytes = bytes;
1685
1686 for (jint idx = 1; idx < cnt; idx++) {
1687 u1 tag = tag_at(idx).value();
1688 jint ent_size = cpool_entry_size(idx);
1689
1690 assert(size + ent_size <= cpool_size, "Size mismatch");
1691
1692 *bytes = tag;
1693 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1694 switch(tag) {
1695 case JVM_CONSTANT_Invalid: {
1696 DBG(printf("JVM_CONSTANT_Invalid"));
1697 break;
1698 }
1699 case JVM_CONSTANT_Unicode: {
1700 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1701 DBG(printf("JVM_CONSTANT_Unicode"));
1702 break;
1703 }
1704 case JVM_CONSTANT_Utf8: {
1705 Symbol* sym = symbol_at(idx);
1706 char* str = sym->as_utf8();
1707 // Warning! It's crashing on x86 with len = sym->utf8_length()
1708 int len = (int) strlen(str);
1709 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1710 for (int i = 0; i < len; i++) {
1711 bytes[3+i] = (u1) str[i];
1712 }
1713 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1714 break;
1715 }
1716 case JVM_CONSTANT_Integer: {
1717 jint val = int_at(idx);
1718 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1719 break;
1720 }
1721 case JVM_CONSTANT_Float: {
1722 jfloat val = float_at(idx);
1723 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1724 break;
1725 }
1726 case JVM_CONSTANT_Long: {
1727 jlong val = long_at(idx);
1728 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1729 idx++; // Long takes two cpool slots
1730 break;
1731 }
1732 case JVM_CONSTANT_Double: {
1733 jdouble val = double_at(idx);
1734 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1735 idx++; // Double takes two cpool slots
1736 break;
1737 }
1738 case JVM_CONSTANT_Class:
1739 case JVM_CONSTANT_UnresolvedClass:
1740 case JVM_CONSTANT_UnresolvedClassInError: {
1741 *bytes = JVM_CONSTANT_Class;
1742 Symbol* sym = klass_name_at(idx);
1743 idx1 = tbl->symbol_to_value(sym);
1744 assert(idx1 != 0, "Have not found a hashtable entry");
1745 Bytes::put_Java_u2((address) (bytes+1), idx1);
1746 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1747 break;
1748 }
1749 case JVM_CONSTANT_String: {
1750 *bytes = JVM_CONSTANT_String;
1751 Symbol* sym = unresolved_string_at(idx);
1752 idx1 = tbl->symbol_to_value(sym);
1753 assert(idx1 != 0, "Have not found a hashtable entry");
1754 Bytes::put_Java_u2((address) (bytes+1), idx1);
1755 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1756 break;
1757 }
1758 case JVM_CONSTANT_Fieldref:
1759 case JVM_CONSTANT_Methodref:
1760 case JVM_CONSTANT_InterfaceMethodref: {
1761 idx1 = uncached_klass_ref_index_at(idx);
1762 idx2 = uncached_name_and_type_ref_index_at(idx);
1763 Bytes::put_Java_u2((address) (bytes+1), idx1);
1764 Bytes::put_Java_u2((address) (bytes+3), idx2);
1765 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1766 break;
1767 }
1768 case JVM_CONSTANT_NameAndType: {
1769 idx1 = name_ref_index_at(idx);
1770 idx2 = signature_ref_index_at(idx);
1771 Bytes::put_Java_u2((address) (bytes+1), idx1);
1772 Bytes::put_Java_u2((address) (bytes+3), idx2);
1773 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1774 break;
1775 }
1776 case JVM_CONSTANT_ClassIndex: {
1777 *bytes = JVM_CONSTANT_Class;
1778 idx1 = klass_index_at(idx);
1779 Bytes::put_Java_u2((address) (bytes+1), idx1);
1780 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1781 break;
1782 }
1783 case JVM_CONSTANT_StringIndex: {
1784 *bytes = JVM_CONSTANT_String;
1785 idx1 = string_index_at(idx);
1786 Bytes::put_Java_u2((address) (bytes+1), idx1);
1787 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1788 break;
1789 }
1790 case JVM_CONSTANT_MethodHandle:
1791 case JVM_CONSTANT_MethodHandleInError: {
1792 *bytes = JVM_CONSTANT_MethodHandle;
1793 int kind = method_handle_ref_kind_at_error_ok(idx);
1794 idx1 = method_handle_index_at_error_ok(idx);
1795 *(bytes+1) = (unsigned char) kind;
1796 Bytes::put_Java_u2((address) (bytes+2), idx1);
1797 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1798 break;
1799 }
1800 case JVM_CONSTANT_MethodType:
1801 case JVM_CONSTANT_MethodTypeInError: {
1802 *bytes = JVM_CONSTANT_MethodType;
1803 idx1 = method_type_index_at_error_ok(idx);
1804 Bytes::put_Java_u2((address) (bytes+1), idx1);
1805 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1806 break;
1807 }
1808 case JVM_CONSTANT_InvokeDynamic: {
1809 *bytes = tag;
1810 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1811 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1812 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1813 Bytes::put_Java_u2((address) (bytes+1), idx1);
1814 Bytes::put_Java_u2((address) (bytes+3), idx2);
1815 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1816 break;
1817 }
1818 }
1819 DBG(printf("\n"));
1820 bytes += ent_size;
1821 size += ent_size;
1822 }
1823 assert(size == cpool_size, "Size mismatch");
1824
1825 // Keep temorarily for debugging until it's stable.
1826 DBG(print_cpool_bytes(cnt, start_bytes));
1827 return (int)(bytes - start_bytes);
1828 } /* end copy_cpool_bytes */
1829
1830 #undef DBG
1831
1832
1833 void ConstantPool::set_on_stack(const bool value) {
1834 if (value) {
1835 int old_flags = *const_cast<volatile int *>(&_flags);
1836 while ((old_flags & _on_stack) == 0) {
1837 int new_flags = old_flags | _on_stack;
1838 int result = Atomic::cmpxchg(new_flags, &_flags, old_flags);
1839
1840 if (result == old_flags) {
1841 // Succeeded.
1842 MetadataOnStackMark::record(this, Thread::current());
1843 return;
1844 }
1845 old_flags = result;
1846 }
1847 } else {
1848 // Clearing is done single-threadedly.
1849 _flags &= ~_on_stack;
1850 }
1851 }
1852
1853 // JSR 292 support for patching constant pool oops after the class is linked and
1854 // the oop array for resolved references are created.
1855 // We can't do this during classfile parsing, which is how the other indexes are
1856 // patched. The other patches are applied early for some error checking
1857 // so only defer the pseudo_strings.
1858 void ConstantPool::patch_resolved_references(
1859 GrowableArray<Handle>* cp_patches) {
1860 assert(EnableInvokeDynamic, "");
1861 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1862 Handle patch = cp_patches->at(index);
1863 if (patch.not_null()) {
1864 assert (tag_at(index).is_string(), "should only be string left");
1865 // Patching a string means pre-resolving it.
1866 // The spelling in the constant pool is ignored.
1867 // The constant reference may be any object whatever.
1868 // If it is not a real interned string, the constant is referred
1869 // to as a "pseudo-string", and must be presented to the CP
1870 // explicitly, because it may require scavenging.
1871 int obj_index = cp_to_object_index(index);
1872 pseudo_string_at_put(index, obj_index, patch());
1873 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1874 }
1875 }
1876 #ifdef ASSERT
1877 // Ensure that all the patches have been used.
1878 for (int index = 0; index < cp_patches->length(); index++) {
1879 assert(cp_patches->at(index).is_null(),
1880 err_msg("Unused constant pool patch at %d in class file %s",
1881 index,
1882 pool_holder()->external_name()));
1883 }
1884 #endif // ASSERT
1885 }
1886
1887 #ifndef PRODUCT
1888
1889 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1890 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1891 guarantee(obj->is_constantPool(), "object must be constant pool");
1892 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1893 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1894
1895 for (int i = 0; i< cp->length(); i++) {
1896 if (cp->tag_at(i).is_unresolved_klass()) {
1897 // This will force loading of the class
1898 Klass* klass = cp->klass_at(i, CHECK);
1899 if (klass->oop_is_instance()) {
1900 // Force initialization of class
1901 InstanceKlass::cast(klass)->initialize(CHECK);
1902 }
1903 }
1904 }
1905 }
1906
1907 #endif
1908
1909
1910 // Printing
1911
1912 void ConstantPool::print_on(outputStream* st) const {
1913 EXCEPTION_MARK;
1914 assert(is_constantPool(), "must be constantPool");
1915 st->print_cr("%s", internal_name());
1916 if (flags() != 0) {
1917 st->print(" - flags: 0x%x", flags());
1918 if (has_preresolution()) st->print(" has_preresolution");
1919 if (on_stack()) st->print(" on_stack");
1920 st->cr();
1921 }
1922 if (pool_holder() != NULL) {
1923 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
1924 }
1925 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
1926 st->print_cr(" - resolved_references: " INTPTR_FORMAT, (void *)resolved_references());
1927 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
1928
1929 for (int index = 1; index < length(); index++) { // Index 0 is unused
1930 ((ConstantPool*)this)->print_entry_on(index, st);
1931 switch (tag_at(index).value()) {
1932 case JVM_CONSTANT_Long :
1933 case JVM_CONSTANT_Double :
1934 index++; // Skip entry following eigth-byte constant
1935 }
1936
1937 }
1938 st->cr();
1939 }
1940
1941 // Print one constant pool entry
1942 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1943 EXCEPTION_MARK;
1944 st->print(" - %3d : ", index);
1945 tag_at(index).print_on(st);
1946 st->print(" : ");
1947 switch (tag_at(index).value()) {
1948 case JVM_CONSTANT_Class :
1949 { Klass* k = klass_at(index, CATCH);
1950 guarantee(k != NULL, "need klass");
1951 k->print_value_on(st);
1952 st->print(" {0x%lx}", (address)k);
1953 }
1954 break;
1955 case JVM_CONSTANT_Fieldref :
1956 case JVM_CONSTANT_Methodref :
1957 case JVM_CONSTANT_InterfaceMethodref :
1958 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1959 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1960 break;
1961 case JVM_CONSTANT_String :
1962 if (is_pseudo_string_at(index)) {
1963 oop anObj = pseudo_string_at(index);
1964 anObj->print_value_on(st);
1965 st->print(" {0x%lx}", (address)anObj);
1966 } else {
1967 unresolved_string_at(index)->print_value_on(st);
1968 }
1969 break;
1970 case JVM_CONSTANT_Integer :
1971 st->print("%d", int_at(index));
1972 break;
1973 case JVM_CONSTANT_Float :
1974 st->print("%f", float_at(index));
1975 break;
1976 case JVM_CONSTANT_Long :
1977 st->print_jlong(long_at(index));
1978 break;
1979 case JVM_CONSTANT_Double :
1980 st->print("%lf", double_at(index));
1981 break;
1982 case JVM_CONSTANT_NameAndType :
1983 st->print("name_index=%d", name_ref_index_at(index));
1984 st->print(" signature_index=%d", signature_ref_index_at(index));
1985 break;
1986 case JVM_CONSTANT_Utf8 :
1987 symbol_at(index)->print_value_on(st);
1988 break;
1989 case JVM_CONSTANT_UnresolvedClass : // fall-through
1990 case JVM_CONSTANT_UnresolvedClassInError: {
1991 // unresolved_klass_at requires lock or safe world.
1992 CPSlot entry = slot_at(index);
1993 if (entry.is_resolved()) {
1994 entry.get_klass()->print_value_on(st);
1995 } else {
1996 entry.get_symbol()->print_value_on(st);
1997 }
1998 }
1999 break;
2000 case JVM_CONSTANT_MethodHandle :
2001 case JVM_CONSTANT_MethodHandleInError :
2002 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index));
2003 st->print(" ref_index=%d", method_handle_index_at_error_ok(index));
2004 break;
2005 case JVM_CONSTANT_MethodType :
2006 case JVM_CONSTANT_MethodTypeInError :
2007 st->print("signature_index=%d", method_type_index_at_error_ok(index));
2008 break;
2009 case JVM_CONSTANT_InvokeDynamic :
2010 {
2011 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
2012 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
2013 int argc = invoke_dynamic_argument_count_at(index);
2014 if (argc > 0) {
2015 for (int arg_i = 0; arg_i < argc; arg_i++) {
2016 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2017 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2018 }
2019 st->print("}");
2020 }
2021 }
2022 break;
2023 default:
2024 ShouldNotReachHere();
2025 break;
2026 }
2027 st->cr();
2028 }
2029
2030 void ConstantPool::print_value_on(outputStream* st) const {
2031 assert(is_constantPool(), "must be constantPool");
2032 st->print("constant pool [%d]", length());
2033 if (has_preresolution()) st->print("/preresolution");
2034 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2035 print_address_on(st);
2036 st->print(" for ");
2037 pool_holder()->print_value_on(st);
2038 if (pool_holder() != NULL) {
2039 bool extra = (pool_holder()->constants() != this);
2040 if (extra) st->print(" (extra)");
2041 }
2042 if (cache() != NULL) {
2043 st->print(" cache=" PTR_FORMAT, cache());
2044 }
2045 }
2046
2047 #if INCLUDE_SERVICES
2048 // Size Statistics
2049 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2050 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2051 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2052 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2053 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2054 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2055
2056 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2057 sz->_cp_refmap_bytes;
2058 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2059 }
2060 #endif // INCLUDE_SERVICES
2061
2062 // Verification
2063
2064 void ConstantPool::verify_on(outputStream* st) {
2065 guarantee(is_constantPool(), "object must be constant pool");
2066 for (int i = 0; i< length(); i++) {
2067 constantTag tag = tag_at(i);
2068 CPSlot entry = slot_at(i);
2069 if (tag.is_klass()) {
2070 if (entry.is_resolved()) {
2071 guarantee(entry.get_klass()->is_klass(), "should be klass");
2072 }
2073 } else if (tag.is_unresolved_klass()) {
2074 if (entry.is_resolved()) {
2075 guarantee(entry.get_klass()->is_klass(), "should be klass");
2076 }
2077 } else if (tag.is_symbol()) {
2078 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2079 } else if (tag.is_string()) {
2080 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2081 }
2082 }
2083 if (cache() != NULL) {
2084 // Note: cache() can be NULL before a class is completely setup or
2085 // in temporary constant pools used during constant pool merging
2086 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2087 }
2088 if (pool_holder() != NULL) {
2089 // Note: pool_holder() can be NULL in temporary constant pools
2090 // used during constant pool merging
2091 guarantee(pool_holder()->is_klass(), "should be klass");
2092 }
2093 }
2094
2095
2096 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2097 char *str = sym->as_utf8();
2098 unsigned int hash = compute_hash(str, sym->utf8_length());
2099 unsigned int index = hash % table_size();
2100
2101 // check if already in map
2102 // we prefer the first entry since it is more likely to be what was used in
2103 // the class file
2104 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2105 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2106 if (en->hash() == hash && en->symbol() == sym) {
2107 return; // already there
2108 }
2109 }
2110
2111 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2112 entry->set_next(bucket(index));
2113 _buckets[index].set_entry(entry);
2114 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2115 }
2116
2117 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2118 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2119 char *str = sym->as_utf8();
2120 int len = sym->utf8_length();
2121 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2122 unsigned int index = hash % table_size();
2123 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2124 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2125 if (en->hash() == hash && en->symbol() == sym) {
2126 return en;
2127 }
2128 }
2129 return NULL;
2130 }