1 /*
2 * Copyright (c) 1997, 2014, 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/stringTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "memory/heapInspection.hpp"
35 #include "memory/metadataFactory.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "oops/constantPool.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/objArrayKlass.hpp"
40 #include "runtime/fieldType.hpp"
41 #include "runtime/init.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/signature.hpp"
44 #include "runtime/vframe.hpp"
45
46 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
47 // Tags are RW but comment below applies to tags also.
48 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
49
50 int size = ConstantPool::size(length);
51
52 // CDS considerations:
53 // Allocate read-write but may be able to move to read-only at dumping time
54 // if all the klasses are resolved. The only other field that is writable is
55 // the resolved_references array, which is recreated at startup time.
56 // But that could be moved to InstanceKlass (although a pain to access from
57 // assembly code). Maybe it could be moved to the cpCache which is RW.
58 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
59 }
60
61 ConstantPool::ConstantPool(Array<u1>* tags) {
62 set_length(tags->length());
63 set_tags(NULL);
64 set_cache(NULL);
65 set_reference_map(NULL);
66 set_resolved_references(NULL);
67 set_operands(NULL);
68 set_pool_holder(NULL);
69 set_flags(0);
70
71 // only set to non-zero if constant pool is merged by RedefineClasses
72 set_version(0);
73 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
74
75 // initialize tag array
76 int length = tags->length();
77 for (int index = 0; index < length; index++) {
78 tags->at_put(index, JVM_CONSTANT_Invalid);
79 }
80 set_tags(tags);
81 }
82
83 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
84 MetadataFactory::free_metadata(loader_data, cache());
85 set_cache(NULL);
86 MetadataFactory::free_array<u2>(loader_data, reference_map());
87 set_reference_map(NULL);
88
89 MetadataFactory::free_array<jushort>(loader_data, operands());
90 set_operands(NULL);
91
92 release_C_heap_structures();
93
94 // free tag array
95 MetadataFactory::free_array<u1>(loader_data, tags());
96 set_tags(NULL);
97 }
98
99 void ConstantPool::release_C_heap_structures() {
100 // walk constant pool and decrement symbol reference counts
101 unreference_symbols();
102
103 delete _lock;
104 set_lock(NULL);
105 }
106
107 objArrayOop ConstantPool::resolved_references() const {
108 return (objArrayOop)JNIHandles::resolve(_resolved_references);
109 }
110
111 // Create resolved_references array and mapping array for original cp indexes
112 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
113 // to map it back for resolving and some unlikely miscellaneous uses.
114 // The objects created by invokedynamic are appended to this list.
115 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
116 intStack reference_map,
117 int constant_pool_map_length,
118 TRAPS) {
119 // Initialized the resolved object cache.
120 int map_length = reference_map.length();
121 if (map_length > 0) {
122 // Only need mapping back to constant pool entries. The map isn't used for
123 // invokedynamic resolved_reference entries. For invokedynamic entries,
124 // the constant pool cache index has the mapping back to both the constant
125 // pool and to the resolved reference index.
126 if (constant_pool_map_length > 0) {
127 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
128
129 for (int i = 0; i < constant_pool_map_length; i++) {
130 int x = reference_map.at(i);
131 assert(x == (int)(jushort) x, "klass index is too big");
132 om->at_put(i, (jushort)x);
133 }
134 set_reference_map(om);
135 }
136
137 // Create Java array for holding resolved strings, methodHandles,
138 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
139 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
140 Handle refs_handle (THREAD, (oop)stom); // must handleize.
141 set_resolved_references(loader_data->add_handle(refs_handle));
142 }
143 }
144
145 // CDS support. Create a new resolved_references array.
146 void ConstantPool::restore_unshareable_info(TRAPS) {
147
148 // Only create the new resolved references array and lock if it hasn't been
149 // attempted before
150 if (resolved_references() != NULL) return;
151
152 // restore the C++ vtable from the shared archive
153 restore_vtable();
154
155 if (SystemDictionary::Object_klass_loaded()) {
156 // Recreate the object array and add to ClassLoaderData.
157 int map_length = resolved_reference_length();
158 if (map_length > 0) {
159 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
160 Handle refs_handle (THREAD, (oop)stom); // must handleize.
161
162 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
163 set_resolved_references(loader_data->add_handle(refs_handle));
164 }
165
166 // Also need to recreate the mutex. Make sure this matches the constructor
167 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
168 }
169 }
170
171 void ConstantPool::remove_unshareable_info() {
172 // Resolved references are not in the shared archive.
173 // Save the length for restoration. It is not necessarily the same length
174 // as reference_map.length() if invokedynamic is saved.
175 set_resolved_reference_length(
176 resolved_references() != NULL ? resolved_references()->length() : 0);
177 set_resolved_references(NULL);
178 set_lock(NULL);
179 }
180
181 int ConstantPool::cp_to_object_index(int cp_index) {
182 // this is harder don't do this so much.
183 int i = reference_map()->find(cp_index);
184 // We might not find the index for jsr292 call.
185 return (i < 0) ? _no_index_sentinel : i;
186 }
187
188 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_cp, int which, TRAPS) {
189 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
190 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
191 // tag is not updated atomicly.
192
193 CPSlot entry = this_cp->slot_at(which);
194 if (entry.is_resolved()) {
195 assert(entry.get_klass()->is_klass(), "must be");
196 // Already resolved - return entry.
197 return entry.get_klass();
198 }
199
200 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
201 // already has updated the object
202 assert(THREAD->is_Java_thread(), "must be a Java thread");
203 bool do_resolve = false;
204 bool in_error = false;
205
206 // Create a handle for the mirror. This will preserve the resolved class
207 // until the loader_data is registered.
208 Handle mirror_handle;
209
210 Symbol* name = NULL;
211 Handle loader;
212 { MonitorLockerEx ml(this_cp->lock());
213
214 if (this_cp->tag_at(which).is_unresolved_klass()) {
215 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
216 in_error = true;
217 } else {
218 do_resolve = true;
219 name = this_cp->unresolved_klass_at(which);
220 loader = Handle(THREAD, this_cp->pool_holder()->class_loader());
221 }
222 }
223 } // unlocking constantPool
224
225
226 // The original attempt to resolve this constant pool entry failed so find the
227 // original error and throw it again (JVMS 5.4.3).
228 if (in_error) {
229 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which);
230 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
231 ResourceMark rm;
232 // exception text will be the class name
233 const char* className = this_cp->unresolved_klass_at(which)->as_C_string();
234 THROW_MSG_0(error, className);
235 }
236
237 if (do_resolve) {
238 // this_cp must be unlocked during resolve_or_fail
239 oop protection_domain = this_cp->pool_holder()->protection_domain();
240 Handle h_prot (THREAD, protection_domain);
241 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
242 KlassHandle k;
243 if (!HAS_PENDING_EXCEPTION) {
244 k = KlassHandle(THREAD, kk);
245 // preserve the resolved klass.
246 mirror_handle = Handle(THREAD, kk->java_mirror());
247 // Do access check for klasses
248 verify_constant_pool_resolve(this_cp, k, THREAD);
249 }
250
251 // Failed to resolve class. We must record the errors so that subsequent attempts
252 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
253 if (HAS_PENDING_EXCEPTION) {
254 ResourceMark rm;
255 Symbol* error = PENDING_EXCEPTION->klass()->name();
256
257 bool throw_orig_error = false;
258 {
259 MonitorLockerEx ml(this_cp->lock());
260
261 // some other thread has beaten us and has resolved the class.
262 if (this_cp->tag_at(which).is_klass()) {
263 CLEAR_PENDING_EXCEPTION;
264 entry = this_cp->resolved_klass_at(which);
265 return entry.get_klass();
266 }
267
268 if (!PENDING_EXCEPTION->
269 is_a(SystemDictionary::LinkageError_klass())) {
270 // Just throw the exception and don't prevent these classes from
271 // being loaded due to virtual machine errors like StackOverflow
272 // and OutOfMemoryError, etc, or if the thread was hit by stop()
273 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
274 }
275 else if (!this_cp->tag_at(which).is_unresolved_klass_in_error()) {
276 SystemDictionary::add_resolution_error(this_cp, which, error);
277 this_cp->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
278 } else {
279 // some other thread has put the class in error state.
280 error = SystemDictionary::find_resolution_error(this_cp, which);
281 assert(error != NULL, "checking");
282 throw_orig_error = true;
283 }
284 } // unlocked
285
286 if (throw_orig_error) {
287 CLEAR_PENDING_EXCEPTION;
288 ResourceMark rm;
289 const char* className = this_cp->unresolved_klass_at(which)->as_C_string();
290 THROW_MSG_0(error, className);
291 }
292
293 return 0;
294 }
295
296 if (TraceClassResolution && !k()->oop_is_array()) {
297 // skip resolving the constant pool so that this code get's
298 // called the next time some bytecodes refer to this class.
299 ResourceMark rm;
300 int line_number = -1;
301 const char * source_file = NULL;
302 if (JavaThread::current()->has_last_Java_frame()) {
303 // try to identify the method which called this function.
304 vframeStream vfst(JavaThread::current());
305 if (!vfst.at_end()) {
306 line_number = vfst.method()->line_number_from_bci(vfst.bci());
307 Symbol* s = vfst.method()->method_holder()->source_file_name();
308 if (s != NULL) {
309 source_file = s->as_C_string();
310 }
311 }
312 }
313 if (k() != this_cp->pool_holder()) {
314 // only print something if the classes are different
315 if (source_file != NULL) {
316 tty->print("RESOLVE %s %s %s:%d\n",
317 this_cp->pool_holder()->external_name(),
318 InstanceKlass::cast(k())->external_name(), source_file, line_number);
319 } else {
320 tty->print("RESOLVE %s %s\n",
321 this_cp->pool_holder()->external_name(),
322 InstanceKlass::cast(k())->external_name());
323 }
324 }
325 return k();
326 } else {
327 MonitorLockerEx ml(this_cp->lock());
328 // Only updated constant pool - if it is resolved.
329 do_resolve = this_cp->tag_at(which).is_unresolved_klass();
330 if (do_resolve) {
331 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
332 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
333 this_cp->klass_at_put(which, k());
334 }
335 }
336 }
337
338 entry = this_cp->resolved_klass_at(which);
339 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
340 return entry.get_klass();
341 }
342
343
344 // Does not update ConstantPool* - to avoid any exception throwing. Used
345 // by compiler and exception handling. Also used to avoid classloads for
346 // instanceof operations. Returns NULL if the class has not been loaded or
347 // if the verification of constant pool failed
348 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_cp, int which) {
349 CPSlot entry = this_cp->slot_at(which);
350 if (entry.is_resolved()) {
351 assert(entry.get_klass()->is_klass(), "must be");
352 return entry.get_klass();
353 } else {
354 assert(entry.is_unresolved(), "must be either symbol or klass");
355 Thread *thread = Thread::current();
356 Symbol* name = entry.get_symbol();
357 oop loader = this_cp->pool_holder()->class_loader();
358 oop protection_domain = this_cp->pool_holder()->protection_domain();
359 Handle h_prot (thread, protection_domain);
360 Handle h_loader (thread, loader);
361 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
362
363 if (k != NULL) {
364 // Make sure that resolving is legal
365 EXCEPTION_MARK;
366 KlassHandle klass(THREAD, k);
367 // return NULL if verification fails
368 verify_constant_pool_resolve(this_cp, klass, THREAD);
369 if (HAS_PENDING_EXCEPTION) {
370 CLEAR_PENDING_EXCEPTION;
371 return NULL;
372 }
373 return klass();
374 } else {
375 return k;
376 }
377 }
378 }
379
380
381 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_cp, int which) {
382 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which));
383 }
384
385
386 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
387 int which) {
388 if (cpool->cache() == NULL) return NULL; // nothing to load yet
389 int cache_index = decode_cpcache_index(which, true);
390 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
391 // FIXME: should be an assert
392 if (PrintMiscellaneous && (Verbose||WizardMode)) {
393 tty->print_cr("bad operand %d in:", which); cpool->print();
394 }
395 return NULL;
396 }
397 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
398 return e->method_if_resolved(cpool);
399 }
400
401
402 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
403 if (cpool->cache() == NULL) return false; // nothing to load yet
404 int cache_index = decode_cpcache_index(which, true);
405 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
406 return e->has_appendix();
407 }
408
409 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
410 if (cpool->cache() == NULL) return NULL; // nothing to load yet
411 int cache_index = decode_cpcache_index(which, true);
412 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
413 return e->appendix_if_resolved(cpool);
414 }
415
416
417 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) {
418 if (cpool->cache() == NULL) return false; // nothing to load yet
419 int cache_index = decode_cpcache_index(which, true);
420 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
421 return e->has_method_type();
422 }
423
424 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) {
425 if (cpool->cache() == NULL) return NULL; // nothing to load yet
426 int cache_index = decode_cpcache_index(which, true);
427 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
428 return e->method_type_if_resolved(cpool);
429 }
430
431
432 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
433 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
434 return symbol_at(name_index);
435 }
436
437
438 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
439 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
440 return symbol_at(signature_index);
441 }
442
443
444 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
445 int i = which;
446 if (!uncached && cache() != NULL) {
447 if (ConstantPool::is_invokedynamic_index(which)) {
448 // Invokedynamic index is index into resolved_references
449 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
450 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
451 assert(tag_at(pool_index).is_name_and_type(), "");
452 return pool_index;
453 }
454 // change byte-ordering and go via cache
455 i = remap_instruction_operand_from_cache(which);
456 } else {
457 if (tag_at(which).is_invoke_dynamic()) {
458 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
459 assert(tag_at(pool_index).is_name_and_type(), "");
460 return pool_index;
461 }
462 }
463 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
464 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
465 jint ref_index = *int_at_addr(i);
466 return extract_high_short_from_int(ref_index);
467 }
468
469
470 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
471 guarantee(!ConstantPool::is_invokedynamic_index(which),
472 "an invokedynamic instruction does not have a klass");
473 int i = which;
474 if (!uncached && cache() != NULL) {
475 // change byte-ordering and go via cache
476 i = remap_instruction_operand_from_cache(which);
477 }
478 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
479 jint ref_index = *int_at_addr(i);
480 return extract_low_short_from_int(ref_index);
481 }
482
483
484
485 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
486 int cpc_index = operand;
487 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
488 assert((int)(u2)cpc_index == cpc_index, "clean u2");
489 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
490 return member_index;
491 }
492
493
494 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_cp, KlassHandle k, TRAPS) {
495 if (k->oop_is_instance() || k->oop_is_objArray()) {
496 instanceKlassHandle holder (THREAD, this_cp->pool_holder());
497 Klass* elem = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
498 KlassHandle element (THREAD, elem);
499
500 // The element type could be a typeArray - we only need the access check if it is
501 // an reference to another class
502 if (element->oop_is_instance()) {
503 LinkResolver::check_klass_accessability(holder, element, CHECK);
504 }
505 }
506 }
507
508
509 int ConstantPool::name_ref_index_at(int which_nt) {
510 jint ref_index = name_and_type_at(which_nt);
511 return extract_low_short_from_int(ref_index);
512 }
513
514
515 int ConstantPool::signature_ref_index_at(int which_nt) {
516 jint ref_index = name_and_type_at(which_nt);
517 return extract_high_short_from_int(ref_index);
518 }
519
520
521 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
522 return klass_at(klass_ref_index_at(which), CHECK_NULL);
523 }
524
525
526 Symbol* ConstantPool::klass_name_at(int which) {
527 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
528 "Corrupted constant pool");
529 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
530 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
531 // tag is not updated atomicly.
532 CPSlot entry = slot_at(which);
533 if (entry.is_resolved()) {
534 // Already resolved - return entry's name.
535 assert(entry.get_klass()->is_klass(), "must be");
536 return entry.get_klass()->name();
537 } else {
538 assert(entry.is_unresolved(), "must be either symbol or klass");
539 return entry.get_symbol();
540 }
541 }
542
543 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
544 jint ref_index = klass_ref_index_at(which);
545 return klass_at_noresolve(ref_index);
546 }
547
548 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
549 jint ref_index = uncached_klass_ref_index_at(which);
550 return klass_at_noresolve(ref_index);
551 }
552
553 char* ConstantPool::string_at_noresolve(int which) {
554 Symbol* s = unresolved_string_at(which);
555 if (s == NULL) {
556 return (char*)"<pseudo-string>";
557 } else {
558 return unresolved_string_at(which)->as_C_string();
559 }
560 }
561
562 BasicType ConstantPool::basic_type_for_signature_at(int which) {
563 return FieldType::basic_type(symbol_at(which));
564 }
565
566
567 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_cp, TRAPS) {
568 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
569 if (this_cp->tag_at(index).is_string()) {
570 this_cp->string_at(index, CHECK);
571 }
572 }
573 }
574
575 // Resolve all the classes in the constant pool. If they are all resolved,
576 // the constant pool is read-only. Enhancement: allocate cp entries to
577 // another metaspace, and copy to read-only or read-write space if this
578 // bit is set.
579 bool ConstantPool::resolve_class_constants(TRAPS) {
580 constantPoolHandle cp(THREAD, this);
581 for (int index = 1; index < length(); index++) { // Index 0 is unused
582 if (tag_at(index).is_unresolved_klass() &&
583 klass_at_if_loaded(cp, index) == NULL) {
584 return false;
585 }
586 }
587 // set_preresolution(); or some bit for future use
588 return true;
589 }
590
591 // If resolution for MethodHandle or MethodType fails, save the exception
592 // in the resolution error table, so that the same exception is thrown again.
593 void ConstantPool::save_and_throw_exception(constantPoolHandle this_cp, int which,
594 int tag, TRAPS) {
595 ResourceMark rm;
596 Symbol* error = PENDING_EXCEPTION->klass()->name();
597 MonitorLockerEx ml(this_cp->lock()); // lock cpool to change tag.
598
599 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
600 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
601
602 if (!PENDING_EXCEPTION->
603 is_a(SystemDictionary::LinkageError_klass())) {
604 // Just throw the exception and don't prevent these classes from
605 // being loaded due to virtual machine errors like StackOverflow
606 // and OutOfMemoryError, etc, or if the thread was hit by stop()
607 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
608
609 } else if (this_cp->tag_at(which).value() != error_tag) {
610 SystemDictionary::add_resolution_error(this_cp, which, error);
611 this_cp->tag_at_put(which, error_tag);
612 } else {
613 // some other thread has put the class in error state.
614 error = SystemDictionary::find_resolution_error(this_cp, which);
615 assert(error != NULL, "checking");
616 CLEAR_PENDING_EXCEPTION;
617 THROW_MSG(error, "");
618 }
619 }
620
621
622 // Called to resolve constants in the constant pool and return an oop.
623 // Some constant pool entries cache their resolved oop. This is also
624 // called to create oops from constants to use in arguments for invokedynamic
625 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_cp, int index, int cache_index, TRAPS) {
626 oop result_oop = NULL;
627 Handle throw_exception;
628
629 if (cache_index == _possible_index_sentinel) {
630 // It is possible that this constant is one which is cached in the objects.
631 // We'll do a linear search. This should be OK because this usage is rare.
632 assert(index > 0, "valid index");
633 cache_index = this_cp->cp_to_object_index(index);
634 }
635 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
636 assert(index == _no_index_sentinel || index >= 0, "");
637
638 if (cache_index >= 0) {
639 result_oop = this_cp->resolved_references()->obj_at(cache_index);
640 if (result_oop != NULL) {
641 return result_oop;
642 // That was easy...
643 }
644 index = this_cp->object_to_cp_index(cache_index);
645 }
646
647 jvalue prim_value; // temp used only in a few cases below
648
649 int tag_value = this_cp->tag_at(index).value();
650
651 switch (tag_value) {
652
653 case JVM_CONSTANT_UnresolvedClass:
654 case JVM_CONSTANT_UnresolvedClassInError:
655 case JVM_CONSTANT_Class:
656 {
657 assert(cache_index == _no_index_sentinel, "should not have been set");
658 Klass* resolved = klass_at_impl(this_cp, index, CHECK_NULL);
659 // ldc wants the java mirror.
660 result_oop = resolved->java_mirror();
661 break;
662 }
663
664 case JVM_CONSTANT_String:
665 assert(cache_index != _no_index_sentinel, "should have been set");
666 if (this_cp->is_pseudo_string_at(index)) {
667 result_oop = this_cp->pseudo_string_at(index, cache_index);
668 break;
669 }
670 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
671 break;
672
673 case JVM_CONSTANT_MethodHandleInError:
674 case JVM_CONSTANT_MethodTypeInError:
675 {
676 Symbol* error = SystemDictionary::find_resolution_error(this_cp, index);
677 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
678 ResourceMark rm;
679 THROW_MSG_0(error, "");
680 break;
681 }
682
683 case JVM_CONSTANT_MethodHandle:
684 {
685 int ref_kind = this_cp->method_handle_ref_kind_at(index);
686 int callee_index = this_cp->method_handle_klass_index_at(index);
687 Symbol* name = this_cp->method_handle_name_ref_at(index);
688 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
689 if (PrintMiscellaneous)
690 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
691 ref_kind, index, this_cp->method_handle_index_at(index),
692 callee_index, name->as_C_string(), signature->as_C_string());
693 KlassHandle callee;
694 { Klass* k = klass_at_impl(this_cp, callee_index, CHECK_NULL);
695 callee = KlassHandle(THREAD, k);
696 }
697 KlassHandle klass(THREAD, this_cp->pool_holder());
698 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
699 callee, name, signature,
700 THREAD);
701 result_oop = value();
702 if (HAS_PENDING_EXCEPTION) {
703 save_and_throw_exception(this_cp, index, tag_value, CHECK_NULL);
704 }
705 break;
706 }
707
708 case JVM_CONSTANT_MethodType:
709 {
710 Symbol* signature = this_cp->method_type_signature_at(index);
711 if (PrintMiscellaneous)
712 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
713 index, this_cp->method_type_index_at(index),
714 signature->as_C_string());
715 KlassHandle klass(THREAD, this_cp->pool_holder());
716 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
717 result_oop = value();
718 if (HAS_PENDING_EXCEPTION) {
719 save_and_throw_exception(this_cp, index, tag_value, CHECK_NULL);
720 }
721 break;
722 }
723
724 case JVM_CONSTANT_Integer:
725 assert(cache_index == _no_index_sentinel, "should not have been set");
726 prim_value.i = this_cp->int_at(index);
727 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
728 break;
729
730 case JVM_CONSTANT_Float:
731 assert(cache_index == _no_index_sentinel, "should not have been set");
732 prim_value.f = this_cp->float_at(index);
733 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
734 break;
735
736 case JVM_CONSTANT_Long:
737 assert(cache_index == _no_index_sentinel, "should not have been set");
738 prim_value.j = this_cp->long_at(index);
739 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
740 break;
741
742 case JVM_CONSTANT_Double:
743 assert(cache_index == _no_index_sentinel, "should not have been set");
744 prim_value.d = this_cp->double_at(index);
745 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
746 break;
747
748 default:
749 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
750 this_cp(), index, cache_index, tag_value) );
751 assert(false, "unexpected constant tag");
752 break;
753 }
754
755 if (cache_index >= 0) {
756 // Cache the oop here also.
757 Handle result_handle(THREAD, result_oop);
758 MonitorLockerEx ml(this_cp->lock()); // don't know if we really need this
759 oop result = this_cp->resolved_references()->obj_at(cache_index);
760 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
761 // The important thing here is that all threads pick up the same result.
762 // It doesn't matter which racing thread wins, as long as only one
763 // result is used by all threads, and all future queries.
764 // That result may be either a resolved constant or a failure exception.
765 if (result == NULL) {
766 this_cp->resolved_references()->obj_at_put(cache_index, result_handle());
767 return result_handle();
768 } else {
769 // Return the winning thread's result. This can be different than
770 // result_handle() for MethodHandles.
771 return result;
772 }
773 } else {
774 return result_oop;
775 }
776 }
777
778 oop ConstantPool::uncached_string_at(int which, TRAPS) {
779 Symbol* sym = unresolved_string_at(which);
780 oop str = StringTable::intern(sym, CHECK_(NULL));
781 assert(java_lang_String::is_instance(str), "must be string");
782 return str;
783 }
784
785
786 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_cp, int index, TRAPS) {
787 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
788
789 Handle bsm;
790 int argc;
791 {
792 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
793 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
794 // It is accompanied by the optional arguments.
795 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
796 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
797 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
798 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
799 }
800
801 // Extract the optional static arguments.
802 argc = this_cp->invoke_dynamic_argument_count_at(index);
803 if (argc == 0) return bsm_oop;
804
805 bsm = Handle(THREAD, bsm_oop);
806 }
807
808 objArrayHandle info;
809 {
810 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
811 info = objArrayHandle(THREAD, info_oop);
812 }
813
814 info->obj_at_put(0, bsm());
815 for (int i = 0; i < argc; i++) {
816 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
817 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
818 info->obj_at_put(1+i, arg_oop);
819 }
820
821 return info();
822 }
823
824 oop ConstantPool::string_at_impl(constantPoolHandle this_cp, int which, int obj_index, TRAPS) {
825 // If the string has already been interned, this entry will be non-null
826 oop str = this_cp->resolved_references()->obj_at(obj_index);
827 if (str != NULL) return str;
828 Symbol* sym = this_cp->unresolved_string_at(which);
829 str = StringTable::intern(sym, CHECK_(NULL));
830 this_cp->string_at_put(which, obj_index, str);
831 assert(java_lang_String::is_instance(str), "must be string");
832 return str;
833 }
834
835
836 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
837 int which) {
838 // Names are interned, so we can compare Symbol*s directly
839 Symbol* cp_name = klass_name_at(which);
840 return (cp_name == k->name());
841 }
842
843
844 // Iterate over symbols and decrement ones which are Symbol*s.
845 // This is done during GC so do not need to lock constantPool unless we
846 // have per-thread safepoints.
847 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
848 // these symbols but didn't increment the reference count.
849 void ConstantPool::unreference_symbols() {
850 for (int index = 1; index < length(); index++) { // Index 0 is unused
851 constantTag tag = tag_at(index);
852 if (tag.is_symbol()) {
853 symbol_at(index)->decrement_refcount();
854 }
855 }
856 }
857
858
859 // Compare this constant pool's entry at index1 to the constant pool
860 // cp2's entry at index2.
861 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
862 int index2, TRAPS) {
863
864 // The error tags are equivalent to non-error tags when comparing
865 jbyte t1 = tag_at(index1).non_error_value();
866 jbyte t2 = cp2->tag_at(index2).non_error_value();
867
868 if (t1 != t2) {
869 // Not the same entry type so there is nothing else to check. Note
870 // that this style of checking will consider resolved/unresolved
871 // class pairs as different.
872 // From the ConstantPool* API point of view, this is correct
873 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
874 // plays out in the context of ConstantPool* merging.
875 return false;
876 }
877
878 switch (t1) {
879 case JVM_CONSTANT_Class:
880 {
881 Klass* k1 = klass_at(index1, CHECK_false);
882 Klass* k2 = cp2->klass_at(index2, CHECK_false);
883 if (k1 == k2) {
884 return true;
885 }
886 } break;
887
888 case JVM_CONSTANT_ClassIndex:
889 {
890 int recur1 = klass_index_at(index1);
891 int recur2 = cp2->klass_index_at(index2);
892 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
893 if (match) {
894 return true;
895 }
896 } break;
897
898 case JVM_CONSTANT_Double:
899 {
900 jdouble d1 = double_at(index1);
901 jdouble d2 = cp2->double_at(index2);
902 if (d1 == d2) {
903 return true;
904 }
905 } break;
906
907 case JVM_CONSTANT_Fieldref:
908 case JVM_CONSTANT_InterfaceMethodref:
909 case JVM_CONSTANT_Methodref:
910 {
911 int recur1 = uncached_klass_ref_index_at(index1);
912 int recur2 = cp2->uncached_klass_ref_index_at(index2);
913 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
914 if (match) {
915 recur1 = uncached_name_and_type_ref_index_at(index1);
916 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
917 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
918 if (match) {
919 return true;
920 }
921 }
922 } break;
923
924 case JVM_CONSTANT_Float:
925 {
926 jfloat f1 = float_at(index1);
927 jfloat f2 = cp2->float_at(index2);
928 if (f1 == f2) {
929 return true;
930 }
931 } break;
932
933 case JVM_CONSTANT_Integer:
934 {
935 jint i1 = int_at(index1);
936 jint i2 = cp2->int_at(index2);
937 if (i1 == i2) {
938 return true;
939 }
940 } break;
941
942 case JVM_CONSTANT_Long:
943 {
944 jlong l1 = long_at(index1);
945 jlong l2 = cp2->long_at(index2);
946 if (l1 == l2) {
947 return true;
948 }
949 } break;
950
951 case JVM_CONSTANT_NameAndType:
952 {
953 int recur1 = name_ref_index_at(index1);
954 int recur2 = cp2->name_ref_index_at(index2);
955 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
956 if (match) {
957 recur1 = signature_ref_index_at(index1);
958 recur2 = cp2->signature_ref_index_at(index2);
959 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
960 if (match) {
961 return true;
962 }
963 }
964 } break;
965
966 case JVM_CONSTANT_StringIndex:
967 {
968 int recur1 = string_index_at(index1);
969 int recur2 = cp2->string_index_at(index2);
970 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
971 if (match) {
972 return true;
973 }
974 } break;
975
976 case JVM_CONSTANT_UnresolvedClass:
977 {
978 Symbol* k1 = unresolved_klass_at(index1);
979 Symbol* k2 = cp2->unresolved_klass_at(index2);
980 if (k1 == k2) {
981 return true;
982 }
983 } break;
984
985 case JVM_CONSTANT_MethodType:
986 {
987 int k1 = method_type_index_at_error_ok(index1);
988 int k2 = cp2->method_type_index_at_error_ok(index2);
989 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
990 if (match) {
991 return true;
992 }
993 } break;
994
995 case JVM_CONSTANT_MethodHandle:
996 {
997 int k1 = method_handle_ref_kind_at_error_ok(index1);
998 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2);
999 if (k1 == k2) {
1000 int i1 = method_handle_index_at_error_ok(index1);
1001 int i2 = cp2->method_handle_index_at_error_ok(index2);
1002 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1003 if (match) {
1004 return true;
1005 }
1006 }
1007 } break;
1008
1009 case JVM_CONSTANT_InvokeDynamic:
1010 {
1011 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1012 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1013 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1014 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1015 // separate statements and variables because CHECK_false is used
1016 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1017 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1018 return (match_entry && match_operand);
1019 } break;
1020
1021 case JVM_CONSTANT_String:
1022 {
1023 Symbol* s1 = unresolved_string_at(index1);
1024 Symbol* s2 = cp2->unresolved_string_at(index2);
1025 if (s1 == s2) {
1026 return true;
1027 }
1028 } break;
1029
1030 case JVM_CONSTANT_Utf8:
1031 {
1032 Symbol* s1 = symbol_at(index1);
1033 Symbol* s2 = cp2->symbol_at(index2);
1034 if (s1 == s2) {
1035 return true;
1036 }
1037 } break;
1038
1039 // Invalid is used as the tag for the second constant pool entry
1040 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1041 // not be seen by itself.
1042 case JVM_CONSTANT_Invalid: // fall through
1043
1044 default:
1045 ShouldNotReachHere();
1046 break;
1047 }
1048
1049 return false;
1050 } // end compare_entry_to()
1051
1052
1053 // Resize the operands array with delta_len and delta_size.
1054 // Used in RedefineClasses for CP merge.
1055 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1056 int old_len = operand_array_length(operands());
1057 int new_len = old_len + delta_len;
1058 int min_len = (delta_len > 0) ? old_len : new_len;
1059
1060 int old_size = operands()->length();
1061 int new_size = old_size + delta_size;
1062 int min_size = (delta_size > 0) ? old_size : new_size;
1063
1064 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1065 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1066
1067 // Set index in the resized array for existing elements only
1068 for (int idx = 0; idx < min_len; idx++) {
1069 int offset = operand_offset_at(idx); // offset in original array
1070 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1071 }
1072 // Copy the bootstrap specifiers only
1073 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1074 new_ops->adr_at(2*new_len),
1075 (min_size - 2*min_len) * sizeof(u2));
1076 // Explicitly deallocate old operands array.
1077 // Note, it is not needed for 7u backport.
1078 if ( operands() != NULL) { // the safety check
1079 MetadataFactory::free_array<u2>(loader_data, operands());
1080 }
1081 set_operands(new_ops);
1082 } // end resize_operands()
1083
1084
1085 // Extend the operands array with the length and size of the ext_cp operands.
1086 // Used in RedefineClasses for CP merge.
1087 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) {
1088 int delta_len = operand_array_length(ext_cp->operands());
1089 if (delta_len == 0) {
1090 return; // nothing to do
1091 }
1092 int delta_size = ext_cp->operands()->length();
1093
1094 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1095
1096 if (operand_array_length(operands()) == 0) {
1097 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1098 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1099 // The first element index defines the offset of second part
1100 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1101 set_operands(new_ops);
1102 } else {
1103 resize_operands(delta_len, delta_size, CHECK);
1104 }
1105
1106 } // end extend_operands()
1107
1108
1109 // Shrink the operands array to a smaller array with new_len length.
1110 // Used in RedefineClasses for CP merge.
1111 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1112 int old_len = operand_array_length(operands());
1113 if (new_len == old_len) {
1114 return; // nothing to do
1115 }
1116 assert(new_len < old_len, "shrunken operands array must be smaller");
1117
1118 int free_base = operand_next_offset_at(new_len - 1);
1119 int delta_len = new_len - old_len;
1120 int delta_size = 2*delta_len + free_base - operands()->length();
1121
1122 resize_operands(delta_len, delta_size, CHECK);
1123
1124 } // end shrink_operands()
1125
1126
1127 void ConstantPool::copy_operands(constantPoolHandle from_cp,
1128 constantPoolHandle to_cp,
1129 TRAPS) {
1130
1131 int from_oplen = operand_array_length(from_cp->operands());
1132 int old_oplen = operand_array_length(to_cp->operands());
1133 if (from_oplen != 0) {
1134 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1135 // append my operands to the target's operands array
1136 if (old_oplen == 0) {
1137 // Can't just reuse from_cp's operand list because of deallocation issues
1138 int len = from_cp->operands()->length();
1139 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1140 Copy::conjoint_memory_atomic(
1141 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1142 to_cp->set_operands(new_ops);
1143 } else {
1144 int old_len = to_cp->operands()->length();
1145 int from_len = from_cp->operands()->length();
1146 int old_off = old_oplen * sizeof(u2);
1147 int from_off = from_oplen * sizeof(u2);
1148 // Use the metaspace for the destination constant pool
1149 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1150 int fillp = 0, len = 0;
1151 // first part of dest
1152 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1153 new_operands->adr_at(fillp),
1154 (len = old_off) * sizeof(u2));
1155 fillp += len;
1156 // first part of src
1157 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1158 new_operands->adr_at(fillp),
1159 (len = from_off) * sizeof(u2));
1160 fillp += len;
1161 // second part of dest
1162 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1163 new_operands->adr_at(fillp),
1164 (len = old_len - old_off) * sizeof(u2));
1165 fillp += len;
1166 // second part of src
1167 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1168 new_operands->adr_at(fillp),
1169 (len = from_len - from_off) * sizeof(u2));
1170 fillp += len;
1171 assert(fillp == new_operands->length(), "");
1172
1173 // Adjust indexes in the first part of the copied operands array.
1174 for (int j = 0; j < from_oplen; j++) {
1175 int offset = operand_offset_at(new_operands, old_oplen + j);
1176 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1177 offset += old_len; // every new tuple is preceded by old_len extra u2's
1178 operand_offset_at_put(new_operands, old_oplen + j, offset);
1179 }
1180
1181 // replace target operands array with combined array
1182 to_cp->set_operands(new_operands);
1183 }
1184 }
1185 } // end copy_operands()
1186
1187
1188 // Copy this constant pool's entries at start_i to end_i (inclusive)
1189 // to the constant pool to_cp's entries starting at to_i. A total of
1190 // (end_i - start_i) + 1 entries are copied.
1191 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1192 constantPoolHandle to_cp, int to_i, TRAPS) {
1193
1194
1195 int dest_i = to_i; // leave original alone for debug purposes
1196
1197 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1198 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1199
1200 switch (from_cp->tag_at(src_i).value()) {
1201 case JVM_CONSTANT_Double:
1202 case JVM_CONSTANT_Long:
1203 // double and long take two constant pool entries
1204 src_i += 2;
1205 dest_i += 2;
1206 break;
1207
1208 default:
1209 // all others take one constant pool entry
1210 src_i++;
1211 dest_i++;
1212 break;
1213 }
1214 }
1215 copy_operands(from_cp, to_cp, CHECK);
1216
1217 } // end copy_cp_to_impl()
1218
1219
1220 // Copy this constant pool's entry at from_i to the constant pool
1221 // to_cp's entry at to_i.
1222 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1223 constantPoolHandle to_cp, int to_i,
1224 TRAPS) {
1225
1226 int tag = from_cp->tag_at(from_i).value();
1227 switch (tag) {
1228 case JVM_CONSTANT_Class:
1229 {
1230 Klass* k = from_cp->klass_at(from_i, CHECK);
1231 to_cp->klass_at_put(to_i, k);
1232 } break;
1233
1234 case JVM_CONSTANT_ClassIndex:
1235 {
1236 jint ki = from_cp->klass_index_at(from_i);
1237 to_cp->klass_index_at_put(to_i, ki);
1238 } break;
1239
1240 case JVM_CONSTANT_Double:
1241 {
1242 jdouble d = from_cp->double_at(from_i);
1243 to_cp->double_at_put(to_i, d);
1244 // double takes two constant pool entries so init second entry's tag
1245 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1246 } break;
1247
1248 case JVM_CONSTANT_Fieldref:
1249 {
1250 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1251 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1252 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1253 } break;
1254
1255 case JVM_CONSTANT_Float:
1256 {
1257 jfloat f = from_cp->float_at(from_i);
1258 to_cp->float_at_put(to_i, f);
1259 } break;
1260
1261 case JVM_CONSTANT_Integer:
1262 {
1263 jint i = from_cp->int_at(from_i);
1264 to_cp->int_at_put(to_i, i);
1265 } break;
1266
1267 case JVM_CONSTANT_InterfaceMethodref:
1268 {
1269 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1270 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1271 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1272 } break;
1273
1274 case JVM_CONSTANT_Long:
1275 {
1276 jlong l = from_cp->long_at(from_i);
1277 to_cp->long_at_put(to_i, l);
1278 // long takes two constant pool entries so init second entry's tag
1279 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1280 } break;
1281
1282 case JVM_CONSTANT_Methodref:
1283 {
1284 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1285 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1286 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1287 } break;
1288
1289 case JVM_CONSTANT_NameAndType:
1290 {
1291 int name_ref_index = from_cp->name_ref_index_at(from_i);
1292 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1293 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1294 } break;
1295
1296 case JVM_CONSTANT_StringIndex:
1297 {
1298 jint si = from_cp->string_index_at(from_i);
1299 to_cp->string_index_at_put(to_i, si);
1300 } break;
1301
1302 case JVM_CONSTANT_UnresolvedClass:
1303 case JVM_CONSTANT_UnresolvedClassInError:
1304 {
1305 // Can be resolved after checking tag, so check the slot first.
1306 CPSlot entry = from_cp->slot_at(from_i);
1307 if (entry.is_resolved()) {
1308 assert(entry.get_klass()->is_klass(), "must be");
1309 // Already resolved
1310 to_cp->klass_at_put(to_i, entry.get_klass());
1311 } else {
1312 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1313 }
1314 } break;
1315
1316 case JVM_CONSTANT_String:
1317 {
1318 Symbol* s = from_cp->unresolved_string_at(from_i);
1319 to_cp->unresolved_string_at_put(to_i, s);
1320 } break;
1321
1322 case JVM_CONSTANT_Utf8:
1323 {
1324 Symbol* s = from_cp->symbol_at(from_i);
1325 // Need to increase refcount, the old one will be thrown away and deferenced
1326 s->increment_refcount();
1327 to_cp->symbol_at_put(to_i, s);
1328 } break;
1329
1330 case JVM_CONSTANT_MethodType:
1331 case JVM_CONSTANT_MethodTypeInError:
1332 {
1333 jint k = from_cp->method_type_index_at_error_ok(from_i);
1334 to_cp->method_type_index_at_put(to_i, k);
1335 } break;
1336
1337 case JVM_CONSTANT_MethodHandle:
1338 case JVM_CONSTANT_MethodHandleInError:
1339 {
1340 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i);
1341 int k2 = from_cp->method_handle_index_at_error_ok(from_i);
1342 to_cp->method_handle_index_at_put(to_i, k1, k2);
1343 } break;
1344
1345 case JVM_CONSTANT_InvokeDynamic:
1346 {
1347 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1348 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1349 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1350 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1351 } break;
1352
1353 // Invalid is used as the tag for the second constant pool entry
1354 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1355 // not be seen by itself.
1356 case JVM_CONSTANT_Invalid: // fall through
1357
1358 default:
1359 {
1360 ShouldNotReachHere();
1361 } break;
1362 }
1363 } // end copy_entry_to()
1364
1365
1366 // Search constant pool search_cp for an entry that matches this
1367 // constant pool's entry at pattern_i. Returns the index of a
1368 // matching entry or zero (0) if there is no matching entry.
1369 int ConstantPool::find_matching_entry(int pattern_i,
1370 constantPoolHandle search_cp, TRAPS) {
1371
1372 // index zero (0) is not used
1373 for (int i = 1; i < search_cp->length(); i++) {
1374 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1375 if (found) {
1376 return i;
1377 }
1378 }
1379
1380 return 0; // entry not found; return unused index zero (0)
1381 } // end find_matching_entry()
1382
1383
1384 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1385 // cp2's bootstrap specifier at idx2.
1386 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) {
1387 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1388 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1389 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1390
1391 if (!match) {
1392 return false;
1393 }
1394 int argc = operand_argument_count_at(idx1);
1395 if (argc == cp2->operand_argument_count_at(idx2)) {
1396 for (int j = 0; j < argc; j++) {
1397 k1 = operand_argument_index_at(idx1, j);
1398 k2 = cp2->operand_argument_index_at(idx2, j);
1399 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1400 if (!match) {
1401 return false;
1402 }
1403 }
1404 return true; // got through loop; all elements equal
1405 }
1406 return false;
1407 } // end compare_operand_to()
1408
1409 // Search constant pool search_cp for a bootstrap specifier that matches
1410 // this constant pool's bootstrap specifier at pattern_i index.
1411 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1412 int ConstantPool::find_matching_operand(int pattern_i,
1413 constantPoolHandle search_cp, int search_len, TRAPS) {
1414 for (int i = 0; i < search_len; i++) {
1415 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1416 if (found) {
1417 return i;
1418 }
1419 }
1420 return -1; // bootstrap specifier not found; return unused index (-1)
1421 } // end find_matching_operand()
1422
1423
1424 #ifndef PRODUCT
1425
1426 const char* ConstantPool::printable_name_at(int which) {
1427
1428 constantTag tag = tag_at(which);
1429
1430 if (tag.is_string()) {
1431 return string_at_noresolve(which);
1432 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1433 return klass_name_at(which)->as_C_string();
1434 } else if (tag.is_symbol()) {
1435 return symbol_at(which)->as_C_string();
1436 }
1437 return "";
1438 }
1439
1440 #endif // PRODUCT
1441
1442
1443 // JVMTI GetConstantPool support
1444
1445 // For debugging of constant pool
1446 const bool debug_cpool = false;
1447
1448 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1449
1450 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1451 const char* WARN_MSG = "Must not be such entry!";
1452 jint size = 0;
1453 u2 idx1, idx2;
1454
1455 for (jint idx = 1; idx < cnt; idx++) {
1456 jint ent_size = 0;
1457 u1 tag = *bytes++;
1458 size++; // count tag
1459
1460 printf("const #%03d, tag: %02d ", idx, tag);
1461 switch(tag) {
1462 case JVM_CONSTANT_Invalid: {
1463 printf("Invalid");
1464 break;
1465 }
1466 case JVM_CONSTANT_Unicode: {
1467 printf("Unicode %s", WARN_MSG);
1468 break;
1469 }
1470 case JVM_CONSTANT_Utf8: {
1471 u2 len = Bytes::get_Java_u2(bytes);
1472 char str[128];
1473 if (len > 127) {
1474 len = 127;
1475 }
1476 strncpy(str, (char *) (bytes+2), len);
1477 str[len] = '\0';
1478 printf("Utf8 \"%s\"", str);
1479 ent_size = 2 + len;
1480 break;
1481 }
1482 case JVM_CONSTANT_Integer: {
1483 u4 val = Bytes::get_Java_u4(bytes);
1484 printf("int %d", *(int *) &val);
1485 ent_size = 4;
1486 break;
1487 }
1488 case JVM_CONSTANT_Float: {
1489 u4 val = Bytes::get_Java_u4(bytes);
1490 printf("float %5.3ff", *(float *) &val);
1491 ent_size = 4;
1492 break;
1493 }
1494 case JVM_CONSTANT_Long: {
1495 u8 val = Bytes::get_Java_u8(bytes);
1496 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1497 ent_size = 8;
1498 idx++; // Long takes two cpool slots
1499 break;
1500 }
1501 case JVM_CONSTANT_Double: {
1502 u8 val = Bytes::get_Java_u8(bytes);
1503 printf("double %5.3fd", *(jdouble *)&val);
1504 ent_size = 8;
1505 idx++; // Double takes two cpool slots
1506 break;
1507 }
1508 case JVM_CONSTANT_Class: {
1509 idx1 = Bytes::get_Java_u2(bytes);
1510 printf("class #%03d", idx1);
1511 ent_size = 2;
1512 break;
1513 }
1514 case JVM_CONSTANT_String: {
1515 idx1 = Bytes::get_Java_u2(bytes);
1516 printf("String #%03d", idx1);
1517 ent_size = 2;
1518 break;
1519 }
1520 case JVM_CONSTANT_Fieldref: {
1521 idx1 = Bytes::get_Java_u2(bytes);
1522 idx2 = Bytes::get_Java_u2(bytes+2);
1523 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1524 ent_size = 4;
1525 break;
1526 }
1527 case JVM_CONSTANT_Methodref: {
1528 idx1 = Bytes::get_Java_u2(bytes);
1529 idx2 = Bytes::get_Java_u2(bytes+2);
1530 printf("Method #%03d, #%03d", idx1, idx2);
1531 ent_size = 4;
1532 break;
1533 }
1534 case JVM_CONSTANT_InterfaceMethodref: {
1535 idx1 = Bytes::get_Java_u2(bytes);
1536 idx2 = Bytes::get_Java_u2(bytes+2);
1537 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1538 ent_size = 4;
1539 break;
1540 }
1541 case JVM_CONSTANT_NameAndType: {
1542 idx1 = Bytes::get_Java_u2(bytes);
1543 idx2 = Bytes::get_Java_u2(bytes+2);
1544 printf("NameAndType #%03d, #%03d", idx1, idx2);
1545 ent_size = 4;
1546 break;
1547 }
1548 case JVM_CONSTANT_ClassIndex: {
1549 printf("ClassIndex %s", WARN_MSG);
1550 break;
1551 }
1552 case JVM_CONSTANT_UnresolvedClass: {
1553 printf("UnresolvedClass: %s", WARN_MSG);
1554 break;
1555 }
1556 case JVM_CONSTANT_UnresolvedClassInError: {
1557 printf("UnresolvedClassInErr: %s", WARN_MSG);
1558 break;
1559 }
1560 case JVM_CONSTANT_StringIndex: {
1561 printf("StringIndex: %s", WARN_MSG);
1562 break;
1563 }
1564 }
1565 printf(";\n");
1566 bytes += ent_size;
1567 size += ent_size;
1568 }
1569 printf("Cpool size: %d\n", size);
1570 fflush(0);
1571 return;
1572 } /* end print_cpool_bytes */
1573
1574
1575 // Returns size of constant pool entry.
1576 jint ConstantPool::cpool_entry_size(jint idx) {
1577 switch(tag_at(idx).value()) {
1578 case JVM_CONSTANT_Invalid:
1579 case JVM_CONSTANT_Unicode:
1580 return 1;
1581
1582 case JVM_CONSTANT_Utf8:
1583 return 3 + symbol_at(idx)->utf8_length();
1584
1585 case JVM_CONSTANT_Class:
1586 case JVM_CONSTANT_String:
1587 case JVM_CONSTANT_ClassIndex:
1588 case JVM_CONSTANT_UnresolvedClass:
1589 case JVM_CONSTANT_UnresolvedClassInError:
1590 case JVM_CONSTANT_StringIndex:
1591 case JVM_CONSTANT_MethodType:
1592 case JVM_CONSTANT_MethodTypeInError:
1593 return 3;
1594
1595 case JVM_CONSTANT_MethodHandle:
1596 case JVM_CONSTANT_MethodHandleInError:
1597 return 4; //tag, ref_kind, ref_index
1598
1599 case JVM_CONSTANT_Integer:
1600 case JVM_CONSTANT_Float:
1601 case JVM_CONSTANT_Fieldref:
1602 case JVM_CONSTANT_Methodref:
1603 case JVM_CONSTANT_InterfaceMethodref:
1604 case JVM_CONSTANT_NameAndType:
1605 return 5;
1606
1607 case JVM_CONSTANT_InvokeDynamic:
1608 // u1 tag, u2 bsm, u2 nt
1609 return 5;
1610
1611 case JVM_CONSTANT_Long:
1612 case JVM_CONSTANT_Double:
1613 return 9;
1614 }
1615 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1616 return 1;
1617 } /* end cpool_entry_size */
1618
1619
1620 // SymbolHashMap is used to find a constant pool index from a string.
1621 // This function fills in SymbolHashMaps, one for utf8s and one for
1622 // class names, returns size of the cpool raw bytes.
1623 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1624 SymbolHashMap *classmap) {
1625 jint size = 0;
1626
1627 for (u2 idx = 1; idx < length(); idx++) {
1628 u2 tag = tag_at(idx).value();
1629 size += cpool_entry_size(idx);
1630
1631 switch(tag) {
1632 case JVM_CONSTANT_Utf8: {
1633 Symbol* sym = symbol_at(idx);
1634 symmap->add_entry(sym, idx);
1635 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1636 break;
1637 }
1638 case JVM_CONSTANT_Class:
1639 case JVM_CONSTANT_UnresolvedClass:
1640 case JVM_CONSTANT_UnresolvedClassInError: {
1641 Symbol* sym = klass_name_at(idx);
1642 classmap->add_entry(sym, idx);
1643 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1644 break;
1645 }
1646 case JVM_CONSTANT_Long:
1647 case JVM_CONSTANT_Double: {
1648 idx++; // Both Long and Double take two cpool slots
1649 break;
1650 }
1651 }
1652 }
1653 return size;
1654 } /* end hash_utf8_entries_to */
1655
1656
1657 // Copy cpool bytes.
1658 // Returns:
1659 // 0, in case of OutOfMemoryError
1660 // -1, in case of internal error
1661 // > 0, count of the raw cpool bytes that have been copied
1662 int ConstantPool::copy_cpool_bytes(int cpool_size,
1663 SymbolHashMap* tbl,
1664 unsigned char *bytes) {
1665 u2 idx1, idx2;
1666 jint size = 0;
1667 jint cnt = length();
1668 unsigned char *start_bytes = bytes;
1669
1670 for (jint idx = 1; idx < cnt; idx++) {
1671 u1 tag = tag_at(idx).value();
1672 jint ent_size = cpool_entry_size(idx);
1673
1674 assert(size + ent_size <= cpool_size, "Size mismatch");
1675
1676 *bytes = tag;
1677 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1678 switch(tag) {
1679 case JVM_CONSTANT_Invalid: {
1680 DBG(printf("JVM_CONSTANT_Invalid"));
1681 break;
1682 }
1683 case JVM_CONSTANT_Unicode: {
1684 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1685 DBG(printf("JVM_CONSTANT_Unicode"));
1686 break;
1687 }
1688 case JVM_CONSTANT_Utf8: {
1689 Symbol* sym = symbol_at(idx);
1690 char* str = sym->as_utf8();
1691 // Warning! It's crashing on x86 with len = sym->utf8_length()
1692 int len = (int) strlen(str);
1693 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1694 for (int i = 0; i < len; i++) {
1695 bytes[3+i] = (u1) str[i];
1696 }
1697 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1698 break;
1699 }
1700 case JVM_CONSTANT_Integer: {
1701 jint val = int_at(idx);
1702 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1703 break;
1704 }
1705 case JVM_CONSTANT_Float: {
1706 jfloat val = float_at(idx);
1707 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1708 break;
1709 }
1710 case JVM_CONSTANT_Long: {
1711 jlong val = long_at(idx);
1712 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1713 idx++; // Long takes two cpool slots
1714 break;
1715 }
1716 case JVM_CONSTANT_Double: {
1717 jdouble val = double_at(idx);
1718 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1719 idx++; // Double takes two cpool slots
1720 break;
1721 }
1722 case JVM_CONSTANT_Class:
1723 case JVM_CONSTANT_UnresolvedClass:
1724 case JVM_CONSTANT_UnresolvedClassInError: {
1725 *bytes = JVM_CONSTANT_Class;
1726 Symbol* sym = klass_name_at(idx);
1727 idx1 = tbl->symbol_to_value(sym);
1728 assert(idx1 != 0, "Have not found a hashtable entry");
1729 Bytes::put_Java_u2((address) (bytes+1), idx1);
1730 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1731 break;
1732 }
1733 case JVM_CONSTANT_String: {
1734 *bytes = JVM_CONSTANT_String;
1735 Symbol* sym = unresolved_string_at(idx);
1736 idx1 = tbl->symbol_to_value(sym);
1737 assert(idx1 != 0, "Have not found a hashtable entry");
1738 Bytes::put_Java_u2((address) (bytes+1), idx1);
1739 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1740 break;
1741 }
1742 case JVM_CONSTANT_Fieldref:
1743 case JVM_CONSTANT_Methodref:
1744 case JVM_CONSTANT_InterfaceMethodref: {
1745 idx1 = uncached_klass_ref_index_at(idx);
1746 idx2 = uncached_name_and_type_ref_index_at(idx);
1747 Bytes::put_Java_u2((address) (bytes+1), idx1);
1748 Bytes::put_Java_u2((address) (bytes+3), idx2);
1749 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1750 break;
1751 }
1752 case JVM_CONSTANT_NameAndType: {
1753 idx1 = name_ref_index_at(idx);
1754 idx2 = signature_ref_index_at(idx);
1755 Bytes::put_Java_u2((address) (bytes+1), idx1);
1756 Bytes::put_Java_u2((address) (bytes+3), idx2);
1757 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1758 break;
1759 }
1760 case JVM_CONSTANT_ClassIndex: {
1761 *bytes = JVM_CONSTANT_Class;
1762 idx1 = klass_index_at(idx);
1763 Bytes::put_Java_u2((address) (bytes+1), idx1);
1764 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1765 break;
1766 }
1767 case JVM_CONSTANT_StringIndex: {
1768 *bytes = JVM_CONSTANT_String;
1769 idx1 = string_index_at(idx);
1770 Bytes::put_Java_u2((address) (bytes+1), idx1);
1771 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1772 break;
1773 }
1774 case JVM_CONSTANT_MethodHandle:
1775 case JVM_CONSTANT_MethodHandleInError: {
1776 *bytes = JVM_CONSTANT_MethodHandle;
1777 int kind = method_handle_ref_kind_at_error_ok(idx);
1778 idx1 = method_handle_index_at_error_ok(idx);
1779 *(bytes+1) = (unsigned char) kind;
1780 Bytes::put_Java_u2((address) (bytes+2), idx1);
1781 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1782 break;
1783 }
1784 case JVM_CONSTANT_MethodType:
1785 case JVM_CONSTANT_MethodTypeInError: {
1786 *bytes = JVM_CONSTANT_MethodType;
1787 idx1 = method_type_index_at_error_ok(idx);
1788 Bytes::put_Java_u2((address) (bytes+1), idx1);
1789 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1790 break;
1791 }
1792 case JVM_CONSTANT_InvokeDynamic: {
1793 *bytes = tag;
1794 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1795 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1796 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1797 Bytes::put_Java_u2((address) (bytes+1), idx1);
1798 Bytes::put_Java_u2((address) (bytes+3), idx2);
1799 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1800 break;
1801 }
1802 }
1803 DBG(printf("\n"));
1804 bytes += ent_size;
1805 size += ent_size;
1806 }
1807 assert(size == cpool_size, "Size mismatch");
1808
1809 // Keep temorarily for debugging until it's stable.
1810 DBG(print_cpool_bytes(cnt, start_bytes));
1811 return (int)(bytes - start_bytes);
1812 } /* end copy_cpool_bytes */
1813
1814 #undef DBG
1815
1816
1817 void ConstantPool::set_on_stack(const bool value) {
1818 if (value) {
1819 _flags |= _on_stack;
1820 } else {
1821 _flags &= ~_on_stack;
1822 }
1823 if (value) MetadataOnStackMark::record(this);
1824 }
1825
1826 // JSR 292 support for patching constant pool oops after the class is linked and
1827 // the oop array for resolved references are created.
1828 // We can't do this during classfile parsing, which is how the other indexes are
1829 // patched. The other patches are applied early for some error checking
1830 // so only defer the pseudo_strings.
1831 void ConstantPool::patch_resolved_references(
1832 GrowableArray<Handle>* cp_patches) {
1833 assert(EnableInvokeDynamic, "");
1834 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1835 Handle patch = cp_patches->at(index);
1836 if (patch.not_null()) {
1837 assert (tag_at(index).is_string(), "should only be string left");
1838 // Patching a string means pre-resolving it.
1839 // The spelling in the constant pool is ignored.
1840 // The constant reference may be any object whatever.
1841 // If it is not a real interned string, the constant is referred
1842 // to as a "pseudo-string", and must be presented to the CP
1843 // explicitly, because it may require scavenging.
1844 int obj_index = cp_to_object_index(index);
1845 pseudo_string_at_put(index, obj_index, patch());
1846 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1847 }
1848 }
1849 #ifdef ASSERT
1850 // Ensure that all the patches have been used.
1851 for (int index = 0; index < cp_patches->length(); index++) {
1852 assert(cp_patches->at(index).is_null(),
1853 err_msg("Unused constant pool patch at %d in class file %s",
1854 index,
1855 pool_holder()->external_name()));
1856 }
1857 #endif // ASSERT
1858 }
1859
1860 #ifndef PRODUCT
1861
1862 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1863 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1864 guarantee(obj->is_constantPool(), "object must be constant pool");
1865 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1866 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1867
1868 for (int i = 0; i< cp->length(); i++) {
1869 if (cp->tag_at(i).is_unresolved_klass()) {
1870 // This will force loading of the class
1871 Klass* klass = cp->klass_at(i, CHECK);
1872 if (klass->oop_is_instance()) {
1873 // Force initialization of class
1874 InstanceKlass::cast(klass)->initialize(CHECK);
1875 }
1876 }
1877 }
1878 }
1879
1880 #endif
1881
1882
1883 // Printing
1884
1885 void ConstantPool::print_on(outputStream* st) const {
1886 assert(is_constantPool(), "must be constantPool");
1887 st->print_cr(internal_name());
1888 if (flags() != 0) {
1889 st->print(" - flags: 0x%x", flags());
1890 if (has_preresolution()) st->print(" has_preresolution");
1891 if (on_stack()) st->print(" on_stack");
1892 st->cr();
1893 }
1894 if (pool_holder() != NULL) {
1895 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
1896 }
1897 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
1898 st->print_cr(" - resolved_references: " INTPTR_FORMAT, (void *)resolved_references());
1899 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
1900
1901 for (int index = 1; index < length(); index++) { // Index 0 is unused
1902 ((ConstantPool*)this)->print_entry_on(index, st);
1903 switch (tag_at(index).value()) {
1904 case JVM_CONSTANT_Long :
1905 case JVM_CONSTANT_Double :
1906 index++; // Skip entry following eigth-byte constant
1907 }
1908
1909 }
1910 st->cr();
1911 }
1912
1913 // Print one constant pool entry
1914 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1915 EXCEPTION_MARK;
1916 st->print(" - %3d : ", index);
1917 tag_at(index).print_on(st);
1918 st->print(" : ");
1919 switch (tag_at(index).value()) {
1920 case JVM_CONSTANT_Class :
1921 { Klass* k = klass_at(index, CATCH);
1922 guarantee(k != NULL, "need klass");
1923 k->print_value_on(st);
1924 st->print(" {0x%lx}", (address)k);
1925 }
1926 break;
1927 case JVM_CONSTANT_Fieldref :
1928 case JVM_CONSTANT_Methodref :
1929 case JVM_CONSTANT_InterfaceMethodref :
1930 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1931 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1932 break;
1933 case JVM_CONSTANT_String :
1934 if (is_pseudo_string_at(index)) {
1935 oop anObj = pseudo_string_at(index);
1936 anObj->print_value_on(st);
1937 st->print(" {0x%lx}", (address)anObj);
1938 } else {
1939 unresolved_string_at(index)->print_value_on(st);
1940 }
1941 break;
1942 case JVM_CONSTANT_Integer :
1943 st->print("%d", int_at(index));
1944 break;
1945 case JVM_CONSTANT_Float :
1946 st->print("%f", float_at(index));
1947 break;
1948 case JVM_CONSTANT_Long :
1949 st->print_jlong(long_at(index));
1950 break;
1951 case JVM_CONSTANT_Double :
1952 st->print("%lf", double_at(index));
1953 break;
1954 case JVM_CONSTANT_NameAndType :
1955 st->print("name_index=%d", name_ref_index_at(index));
1956 st->print(" signature_index=%d", signature_ref_index_at(index));
1957 break;
1958 case JVM_CONSTANT_Utf8 :
1959 symbol_at(index)->print_value_on(st);
1960 break;
1961 case JVM_CONSTANT_UnresolvedClass : // fall-through
1962 case JVM_CONSTANT_UnresolvedClassInError: {
1963 // unresolved_klass_at requires lock or safe world.
1964 CPSlot entry = slot_at(index);
1965 if (entry.is_resolved()) {
1966 entry.get_klass()->print_value_on(st);
1967 } else {
1968 entry.get_symbol()->print_value_on(st);
1969 }
1970 }
1971 break;
1972 case JVM_CONSTANT_MethodHandle :
1973 case JVM_CONSTANT_MethodHandleInError :
1974 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index));
1975 st->print(" ref_index=%d", method_handle_index_at_error_ok(index));
1976 break;
1977 case JVM_CONSTANT_MethodType :
1978 case JVM_CONSTANT_MethodTypeInError :
1979 st->print("signature_index=%d", method_type_index_at_error_ok(index));
1980 break;
1981 case JVM_CONSTANT_InvokeDynamic :
1982 {
1983 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1984 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1985 int argc = invoke_dynamic_argument_count_at(index);
1986 if (argc > 0) {
1987 for (int arg_i = 0; arg_i < argc; arg_i++) {
1988 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1989 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1990 }
1991 st->print("}");
1992 }
1993 }
1994 break;
1995 default:
1996 ShouldNotReachHere();
1997 break;
1998 }
1999 st->cr();
2000 }
2001
2002 void ConstantPool::print_value_on(outputStream* st) const {
2003 assert(is_constantPool(), "must be constantPool");
2004 st->print("constant pool [%d]", length());
2005 if (has_preresolution()) st->print("/preresolution");
2006 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2007 print_address_on(st);
2008 st->print(" for ");
2009 pool_holder()->print_value_on(st);
2010 if (pool_holder() != NULL) {
2011 bool extra = (pool_holder()->constants() != this);
2012 if (extra) st->print(" (extra)");
2013 }
2014 if (cache() != NULL) {
2015 st->print(" cache=" PTR_FORMAT, cache());
2016 }
2017 }
2018
2019 #if INCLUDE_SERVICES
2020 // Size Statistics
2021 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2022 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2023 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2024 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2025 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2026 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2027
2028 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2029 sz->_cp_refmap_bytes;
2030 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2031 }
2032 #endif // INCLUDE_SERVICES
2033
2034 // Verification
2035
2036 void ConstantPool::verify_on(outputStream* st) {
2037 guarantee(is_constantPool(), "object must be constant pool");
2038 for (int i = 0; i< length(); i++) {
2039 constantTag tag = tag_at(i);
2040 CPSlot entry = slot_at(i);
2041 if (tag.is_klass()) {
2042 if (entry.is_resolved()) {
2043 guarantee(entry.get_klass()->is_klass(), "should be klass");
2044 }
2045 } else if (tag.is_unresolved_klass()) {
2046 if (entry.is_resolved()) {
2047 guarantee(entry.get_klass()->is_klass(), "should be klass");
2048 }
2049 } else if (tag.is_symbol()) {
2050 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2051 } else if (tag.is_string()) {
2052 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2053 }
2054 }
2055 if (cache() != NULL) {
2056 // Note: cache() can be NULL before a class is completely setup or
2057 // in temporary constant pools used during constant pool merging
2058 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2059 }
2060 if (pool_holder() != NULL) {
2061 // Note: pool_holder() can be NULL in temporary constant pools
2062 // used during constant pool merging
2063 guarantee(pool_holder()->is_klass(), "should be klass");
2064 }
2065 }
2066
2067
2068 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2069 char *str = sym->as_utf8();
2070 unsigned int hash = compute_hash(str, sym->utf8_length());
2071 unsigned int index = hash % table_size();
2072
2073 // check if already in map
2074 // we prefer the first entry since it is more likely to be what was used in
2075 // the class file
2076 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2077 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2078 if (en->hash() == hash && en->symbol() == sym) {
2079 return; // already there
2080 }
2081 }
2082
2083 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2084 entry->set_next(bucket(index));
2085 _buckets[index].set_entry(entry);
2086 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2087 }
2088
2089 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2090 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2091 char *str = sym->as_utf8();
2092 int len = sym->utf8_length();
2093 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2094 unsigned int index = hash % table_size();
2095 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2096 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2097 if (en->hash() == hash && en->symbol() == sym) {
2098 return en;
2099 }
2100 }
2101 return NULL;
2102 }