1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/metadataOnStackMark.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/heapInspection.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/constantPool.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/objArrayKlass.hpp"
40 #include "oops/objArrayOop.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "runtime/fieldType.hpp"
43 #include "runtime/init.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/signature.hpp"
46 #include "runtime/vframe.hpp"
47 #include "utilities/copy.hpp"
48
49 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
50 // Tags are RW but comment below applies to tags also.
51 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
52
53 int size = ConstantPool::size(length);
54
55 // CDS considerations:
56 // Allocate read-write but may be able to move to read-only at dumping time
57 // if all the klasses are resolved. The only other field that is writable is
58 // the resolved_references array, which is recreated at startup time.
59 // But that could be moved to InstanceKlass (although a pain to access from
60 // assembly code). Maybe it could be moved to the cpCache which is RW.
61 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
62 }
63
64 #ifdef ASSERT
65
66 // MetaspaceObj allocation invariant is calloc equivalent memory
67 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
68 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
69 assert(tags != NULL, "invariant");
70 const int length = tags->length();
71 for (int index = 0; index < length; ++index) {
72 if (JVM_CONSTANT_Invalid != tags->at(index)) {
73 return false;
74 }
75 }
76 return true;
77 }
78
79 #endif
80
81 ConstantPool::ConstantPool(Array<u1>* tags) :
82 _tags(tags),
83 _length(tags->length()) {
84
85 assert(_tags != NULL, "invariant");
86 assert(tags->length() == _length, "invariant");
87 assert(tag_array_is_zero_initialized(tags), "invariant");
88 assert(0 == _flags, "invariant");
89 assert(0 == version(), "invariant");
90 assert(NULL == _pool_holder, "invariant");
91 }
92
93 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
94 MetadataFactory::free_metadata(loader_data, cache());
95 set_cache(NULL);
96 MetadataFactory::free_array<u2>(loader_data, reference_map());
97 set_reference_map(NULL);
98
99 MetadataFactory::free_array<jushort>(loader_data, operands());
100 set_operands(NULL);
101
102 release_C_heap_structures();
103
104 // free tag array
105 MetadataFactory::free_array<u1>(loader_data, tags());
106 set_tags(NULL);
107 }
108
109 void ConstantPool::release_C_heap_structures() {
110 // walk constant pool and decrement symbol reference counts
111 unreference_symbols();
112 }
113
114 objArrayOop ConstantPool::resolved_references() const {
115 return (objArrayOop)JNIHandles::resolve(_resolved_references);
116 }
117
118 // Create resolved_references array and mapping array for original cp indexes
119 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
120 // to map it back for resolving and some unlikely miscellaneous uses.
121 // The objects created by invokedynamic are appended to this list.
122 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
123 const intStack& reference_map,
124 int constant_pool_map_length,
125 TRAPS) {
126 // Initialized the resolved object cache.
127 int map_length = reference_map.length();
128 if (map_length > 0) {
129 // Only need mapping back to constant pool entries. The map isn't used for
130 // invokedynamic resolved_reference entries. For invokedynamic entries,
131 // the constant pool cache index has the mapping back to both the constant
132 // pool and to the resolved reference index.
133 if (constant_pool_map_length > 0) {
134 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
135
136 for (int i = 0; i < constant_pool_map_length; i++) {
137 int x = reference_map.at(i);
138 assert(x == (int)(jushort) x, "klass index is too big");
139 om->at_put(i, (jushort)x);
140 }
141 set_reference_map(om);
142 }
143
144 // Create Java array for holding resolved strings, methodHandles,
145 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
146 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
147 Handle refs_handle (THREAD, (oop)stom); // must handleize.
148 set_resolved_references(loader_data->add_handle(refs_handle));
149 }
150 }
151
152 // CDS support. Create a new resolved_references array.
153 void ConstantPool::restore_unshareable_info(TRAPS) {
154
155 // Only create the new resolved references array if it hasn't been attempted before
156 if (resolved_references() != NULL) return;
157
158 // restore the C++ vtable from the shared archive
159 restore_vtable();
160
161 if (SystemDictionary::Object_klass_loaded()) {
162 // Recreate the object array and add to ClassLoaderData.
163 int map_length = resolved_reference_length();
164 if (map_length > 0) {
165 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
166 Handle refs_handle (THREAD, (oop)stom); // must handleize.
167
168 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
169 set_resolved_references(loader_data->add_handle(refs_handle));
170 }
171 }
172 }
173
174 void ConstantPool::remove_unshareable_info() {
175 // Resolved references are not in the shared archive.
176 // Save the length for restoration. It is not necessarily the same length
177 // as reference_map.length() if invokedynamic is saved.
178 set_resolved_reference_length(
179 resolved_references() != NULL ? resolved_references()->length() : 0);
180 set_resolved_references(NULL);
181 }
182
183 int ConstantPool::cp_to_object_index(int cp_index) {
184 // this is harder don't do this so much.
185 int i = reference_map()->find(cp_index);
186 // We might not find the index for jsr292 call.
187 return (i < 0) ? _no_index_sentinel : i;
188 }
189
190 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
191 resolved_references()->obj_at_put(obj_index, str);
192 }
193
194 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, KlassHandle k) {
195 ResourceMark rm;
196 int line_number = -1;
197 const char * source_file = NULL;
198 if (JavaThread::current()->has_last_Java_frame()) {
199 // try to identify the method which called this function.
200 vframeStream vfst(JavaThread::current());
201 if (!vfst.at_end()) {
202 line_number = vfst.method()->line_number_from_bci(vfst.bci());
203 Symbol* s = vfst.method()->method_holder()->source_file_name();
204 if (s != NULL) {
205 source_file = s->as_C_string();
206 }
207 }
208 }
209 if (k() != this_cp->pool_holder()) {
210 // only print something if the classes are different
211 if (source_file != NULL) {
212 log_debug(class, resolve)("%s %s %s:%d",
213 this_cp->pool_holder()->external_name(),
214 k->external_name(), source_file, line_number);
215 } else {
216 log_debug(class, resolve)("%s %s",
217 this_cp->pool_holder()->external_name(),
218 k->external_name());
219 }
220 }
221 }
222
223 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
224 bool save_resolution_error, TRAPS) {
225 assert(THREAD->is_Java_thread(), "must be a Java thread");
226
227 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
228 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
229 // the entry and tag is not updated atomicly.
230 CPSlot entry = this_cp->slot_at(which);
231 if (entry.is_resolved()) {
232 assert(entry.get_klass()->is_klass(), "must be");
233 // Already resolved - return entry.
234 return entry.get_klass();
235 }
236
237 // This tag doesn't change back to unresolved class unless at a safepoint.
238 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
239 // The original attempt to resolve this constant pool entry failed so find the
240 // class of the original error and throw another error of the same class
241 // (JVMS 5.4.3).
242 // If there is a detail message, pass that detail message to the error.
243 // The JVMS does not strictly require us to duplicate the same detail message,
244 // or any internal exception fields such as cause or stacktrace. But since the
245 // detail message is often a class name or other literal string, we will repeat it
246 // if we can find it in the symbol table.
247 throw_resolution_error(this_cp, which, CHECK_0);
248 ShouldNotReachHere();
249 }
250
251 Handle mirror_handle;
252 Symbol* name = entry.get_symbol();
253 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
254 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
255 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
256 KlassHandle k (THREAD, kk);
257 if (!HAS_PENDING_EXCEPTION) {
258 // preserve the resolved klass from unloading
259 mirror_handle = Handle(THREAD, kk->java_mirror());
260 // Do access check for klasses
261 verify_constant_pool_resolve(this_cp, k, THREAD);
262 }
263
264 // Failed to resolve class. We must record the errors so that subsequent attempts
265 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
266 if (HAS_PENDING_EXCEPTION) {
267 if (save_resolution_error) {
268 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
269 // If CHECK_NULL above doesn't return the exception, that means that
270 // some other thread has beaten us and has resolved the class.
271 // To preserve old behavior, we return the resolved class.
272 entry = this_cp->resolved_klass_at(which);
273 assert(entry.is_resolved(), "must be resolved if exception was cleared");
274 assert(entry.get_klass()->is_klass(), "must be resolved to a klass");
275 return entry.get_klass();
276 } else {
277 return NULL; // return the pending exception
278 }
279 }
280
281 // Make this class loader depend upon the class loader owning the class reference
282 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
283 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
284
285 // logging for class+resolve.
286 if (log_is_enabled(Debug, class, resolve)){
287 trace_class_resolution(this_cp, k);
288 }
289 this_cp->klass_at_put(which, k());
290 entry = this_cp->resolved_klass_at(which);
291 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
292 return entry.get_klass();
293 }
294
295
296 // Does not update ConstantPool* - to avoid any exception throwing. Used
297 // by compiler and exception handling. Also used to avoid classloads for
298 // instanceof operations. Returns NULL if the class has not been loaded or
299 // if the verification of constant pool failed
300 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
301 CPSlot entry = this_cp->slot_at(which);
302 if (entry.is_resolved()) {
303 assert(entry.get_klass()->is_klass(), "must be");
304 return entry.get_klass();
305 } else {
306 assert(entry.is_unresolved(), "must be either symbol or klass");
307 Thread *thread = Thread::current();
308 Symbol* name = entry.get_symbol();
309 oop loader = this_cp->pool_holder()->class_loader();
310 oop protection_domain = this_cp->pool_holder()->protection_domain();
311 Handle h_prot (thread, protection_domain);
312 Handle h_loader (thread, loader);
313 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
314
315 if (k != NULL) {
316 // Make sure that resolving is legal
317 EXCEPTION_MARK;
318 KlassHandle klass(THREAD, k);
319 // return NULL if verification fails
320 verify_constant_pool_resolve(this_cp, klass, THREAD);
321 if (HAS_PENDING_EXCEPTION) {
322 CLEAR_PENDING_EXCEPTION;
323 return NULL;
324 }
325 return klass();
326 } else {
327 return k;
328 }
329 }
330 }
331
332
333 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) {
334 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which));
335 }
336
337
338 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
339 int which) {
340 if (cpool->cache() == NULL) return NULL; // nothing to load yet
341 int cache_index = decode_cpcache_index(which, true);
342 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
343 // FIXME: should be an assert
344 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
345 return NULL;
346 }
347 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
348 return e->method_if_resolved(cpool);
349 }
350
351
352 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
353 if (cpool->cache() == NULL) return false; // nothing to load yet
354 int cache_index = decode_cpcache_index(which, true);
355 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
356 return e->has_appendix();
357 }
358
359 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
360 if (cpool->cache() == NULL) return NULL; // nothing to load yet
361 int cache_index = decode_cpcache_index(which, true);
362 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
363 return e->appendix_if_resolved(cpool);
364 }
365
366
367 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
368 if (cpool->cache() == NULL) return false; // nothing to load yet
369 int cache_index = decode_cpcache_index(which, true);
370 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
371 return e->has_method_type();
372 }
373
374 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
375 if (cpool->cache() == NULL) return NULL; // nothing to load yet
376 int cache_index = decode_cpcache_index(which, true);
377 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
378 return e->method_type_if_resolved(cpool);
379 }
380
381
382 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
383 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
384 return symbol_at(name_index);
385 }
386
387
388 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
389 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
390 return symbol_at(signature_index);
391 }
392
393
394 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
395 int i = which;
396 if (!uncached && cache() != NULL) {
397 if (ConstantPool::is_invokedynamic_index(which)) {
398 // Invokedynamic index is index into the constant pool cache
399 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
400 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
401 assert(tag_at(pool_index).is_name_and_type(), "");
402 return pool_index;
403 }
404 // change byte-ordering and go via cache
405 i = remap_instruction_operand_from_cache(which);
406 } else {
407 if (tag_at(which).is_invoke_dynamic()) {
408 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
409 assert(tag_at(pool_index).is_name_and_type(), "");
410 return pool_index;
411 }
412 }
413 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
414 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
415 jint ref_index = *int_at_addr(i);
416 return extract_high_short_from_int(ref_index);
417 }
418
419
420 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
421 guarantee(!ConstantPool::is_invokedynamic_index(which),
422 "an invokedynamic instruction does not have a klass");
423 int i = which;
424 if (!uncached && cache() != NULL) {
425 // change byte-ordering and go via cache
426 i = remap_instruction_operand_from_cache(which);
427 }
428 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
429 jint ref_index = *int_at_addr(i);
430 return extract_low_short_from_int(ref_index);
431 }
432
433
434
435 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
436 int cpc_index = operand;
437 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
438 assert((int)(u2)cpc_index == cpc_index, "clean u2");
439 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
440 return member_index;
441 }
442
443
444 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, KlassHandle k, TRAPS) {
445 if (k->is_instance_klass() || k->is_objArray_klass()) {
446 instanceKlassHandle holder (THREAD, this_cp->pool_holder());
447 Klass* elem = k->is_instance_klass() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
448 KlassHandle element (THREAD, elem);
449
450 // The element type could be a typeArray - we only need the access check if it is
451 // an reference to another class
452 if (element->is_instance_klass()) {
453 LinkResolver::check_klass_accessability(holder, element, CHECK);
454 }
455 }
456 }
457
458
459 int ConstantPool::name_ref_index_at(int which_nt) {
460 jint ref_index = name_and_type_at(which_nt);
461 return extract_low_short_from_int(ref_index);
462 }
463
464
465 int ConstantPool::signature_ref_index_at(int which_nt) {
466 jint ref_index = name_and_type_at(which_nt);
467 return extract_high_short_from_int(ref_index);
468 }
469
470
471 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
472 return klass_at(klass_ref_index_at(which), THREAD);
473 }
474
475
476 Symbol* ConstantPool::klass_name_at(int which) const {
477 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
478 "Corrupted constant pool");
479 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
480 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
481 // tag is not updated atomicly.
482 CPSlot entry = slot_at(which);
483 if (entry.is_resolved()) {
484 // Already resolved - return entry's name.
485 assert(entry.get_klass()->is_klass(), "must be");
486 return entry.get_klass()->name();
487 } else {
488 assert(entry.is_unresolved(), "must be either symbol or klass");
489 return entry.get_symbol();
490 }
491 }
492
493 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
494 jint ref_index = klass_ref_index_at(which);
495 return klass_at_noresolve(ref_index);
496 }
497
498 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
499 jint ref_index = uncached_klass_ref_index_at(which);
500 return klass_at_noresolve(ref_index);
501 }
502
503 char* ConstantPool::string_at_noresolve(int which) {
504 return unresolved_string_at(which)->as_C_string();
505 }
506
507 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
508 return FieldType::basic_type(symbol_at(which));
509 }
510
511
512 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
513 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
514 if (this_cp->tag_at(index).is_string()) {
515 this_cp->string_at(index, CHECK);
516 }
517 }
518 }
519
520 // Resolve all the classes in the constant pool. If they are all resolved,
521 // the constant pool is read-only. Enhancement: allocate cp entries to
522 // another metaspace, and copy to read-only or read-write space if this
523 // bit is set.
524 bool ConstantPool::resolve_class_constants(TRAPS) {
525 constantPoolHandle cp(THREAD, this);
526 for (int index = 1; index < length(); index++) { // Index 0 is unused
527 if (tag_at(index).is_unresolved_klass() &&
528 klass_at_if_loaded(cp, index) == NULL) {
529 return false;
530 }
531 }
532 // set_preresolution(); or some bit for future use
533 return true;
534 }
535
536 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
537 // Dig out the detailed message to reuse if possible
538 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
539 if (message != NULL) {
540 return message;
541 }
542
543 // Return specific message for the tag
544 switch (tag.value()) {
545 case JVM_CONSTANT_UnresolvedClass:
546 // return the class name in the error message
547 message = this_cp->klass_name_at(which);
548 break;
549 case JVM_CONSTANT_MethodHandle:
550 // return the method handle name in the error message
551 message = this_cp->method_handle_name_ref_at(which);
552 break;
553 case JVM_CONSTANT_MethodType:
554 // return the method type signature in the error message
555 message = this_cp->method_type_signature_at(which);
556 break;
557 default:
558 ShouldNotReachHere();
559 }
560
561 return message;
562 }
563
564 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
565 Symbol* message = NULL;
566 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
567 assert(error != NULL && message != NULL, "checking");
568 CLEAR_PENDING_EXCEPTION;
569 ResourceMark rm;
570 THROW_MSG(error, message->as_C_string());
571 }
572
573 // If resolution for Class, MethodHandle or MethodType fails, save the exception
574 // in the resolution error table, so that the same exception is thrown again.
575 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
576 constantTag tag, TRAPS) {
577 Symbol* error = PENDING_EXCEPTION->klass()->name();
578
579 int error_tag = tag.error_value();
580
581 if (!PENDING_EXCEPTION->
582 is_a(SystemDictionary::LinkageError_klass())) {
583 // Just throw the exception and don't prevent these classes from
584 // being loaded due to virtual machine errors like StackOverflow
585 // and OutOfMemoryError, etc, or if the thread was hit by stop()
586 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
587 } else if (this_cp->tag_at(which).value() != error_tag) {
588 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
589 SystemDictionary::add_resolution_error(this_cp, which, error, message);
590 // CAS in the tag. If a thread beat us to registering this error that's fine.
591 // If another thread resolved the reference, this is a race condition. This
592 // thread may have had a security manager or something temporary.
593 // This doesn't deterministically get an error. So why do we save this?
594 // We save this because jvmti can add classes to the bootclass path after
595 // this error, so it needs to get the same error if the error is first.
596 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
597 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
598 if (old_tag != error_tag && old_tag != tag.value()) {
599 // MethodHandles and MethodType doesn't change to resolved version.
600 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
601 // Forget the exception and use the resolved class.
602 CLEAR_PENDING_EXCEPTION;
603 }
604 } else {
605 // some other thread put this in error state
606 throw_resolution_error(this_cp, which, CHECK);
607 }
608 }
609
610 // Called to resolve constants in the constant pool and return an oop.
611 // Some constant pool entries cache their resolved oop. This is also
612 // called to create oops from constants to use in arguments for invokedynamic
613 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) {
614 oop result_oop = NULL;
615 Handle throw_exception;
616
617 if (cache_index == _possible_index_sentinel) {
618 // It is possible that this constant is one which is cached in the objects.
619 // We'll do a linear search. This should be OK because this usage is rare.
620 assert(index > 0, "valid index");
621 cache_index = this_cp->cp_to_object_index(index);
622 }
623 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
624 assert(index == _no_index_sentinel || index >= 0, "");
625
626 if (cache_index >= 0) {
627 result_oop = this_cp->resolved_references()->obj_at(cache_index);
628 if (result_oop != NULL) {
629 return result_oop;
630 // That was easy...
631 }
632 index = this_cp->object_to_cp_index(cache_index);
633 }
634
635 jvalue prim_value; // temp used only in a few cases below
636
637 constantTag tag = this_cp->tag_at(index);
638
639 switch (tag.value()) {
640
641 case JVM_CONSTANT_UnresolvedClass:
642 case JVM_CONSTANT_UnresolvedClassInError:
643 case JVM_CONSTANT_Class:
644 {
645 assert(cache_index == _no_index_sentinel, "should not have been set");
646 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
647 // ldc wants the java mirror.
648 result_oop = resolved->java_mirror();
649 break;
650 }
651
652 case JVM_CONSTANT_String:
653 assert(cache_index != _no_index_sentinel, "should have been set");
654 if (this_cp->is_pseudo_string_at(index)) {
655 result_oop = this_cp->pseudo_string_at(index, cache_index);
656 break;
657 }
658 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
659 break;
660
661 case JVM_CONSTANT_MethodHandleInError:
662 case JVM_CONSTANT_MethodTypeInError:
663 {
664 throw_resolution_error(this_cp, index, CHECK_NULL);
665 break;
666 }
667
668 case JVM_CONSTANT_MethodHandle:
669 {
670 int ref_kind = this_cp->method_handle_ref_kind_at(index);
671 int callee_index = this_cp->method_handle_klass_index_at(index);
672 Symbol* name = this_cp->method_handle_name_ref_at(index);
673 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
674 { ResourceMark rm(THREAD);
675 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
676 ref_kind, index, this_cp->method_handle_index_at(index),
677 callee_index, name->as_C_string(), signature->as_C_string());
678 }
679 KlassHandle callee;
680 { Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
681 callee = KlassHandle(THREAD, k);
682 }
683 KlassHandle klass(THREAD, this_cp->pool_holder());
684 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
685 callee, name, signature,
686 THREAD);
687 result_oop = value();
688 if (HAS_PENDING_EXCEPTION) {
689 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
690 }
691 break;
692 }
693
694 case JVM_CONSTANT_MethodType:
695 {
696 Symbol* signature = this_cp->method_type_signature_at(index);
697 { ResourceMark rm(THREAD);
698 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
699 index, this_cp->method_type_index_at(index),
700 signature->as_C_string());
701 }
702 KlassHandle klass(THREAD, this_cp->pool_holder());
703 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
704 result_oop = value();
705 if (HAS_PENDING_EXCEPTION) {
706 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
707 }
708 break;
709 }
710
711 case JVM_CONSTANT_Integer:
712 assert(cache_index == _no_index_sentinel, "should not have been set");
713 prim_value.i = this_cp->int_at(index);
714 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
715 break;
716
717 case JVM_CONSTANT_Float:
718 assert(cache_index == _no_index_sentinel, "should not have been set");
719 prim_value.f = this_cp->float_at(index);
720 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
721 break;
722
723 case JVM_CONSTANT_Long:
724 assert(cache_index == _no_index_sentinel, "should not have been set");
725 prim_value.j = this_cp->long_at(index);
726 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
727 break;
728
729 case JVM_CONSTANT_Double:
730 assert(cache_index == _no_index_sentinel, "should not have been set");
731 prim_value.d = this_cp->double_at(index);
732 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
733 break;
734
735 default:
736 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
737 this_cp(), index, cache_index, tag.value()));
738 assert(false, "unexpected constant tag");
739 break;
740 }
741
742 if (cache_index >= 0) {
743 // Benign race condition: resolved_references may already be filled in.
744 // The important thing here is that all threads pick up the same result.
745 // It doesn't matter which racing thread wins, as long as only one
746 // result is used by all threads, and all future queries.
747 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL);
748 if (old_result == NULL) {
749 return result_oop; // was installed
750 } else {
751 // Return the winning thread's result. This can be different than
752 // the result here for MethodHandles.
753 return old_result;
754 }
755 } else {
756 return result_oop;
757 }
758 }
759
760 oop ConstantPool::uncached_string_at(int which, TRAPS) {
761 Symbol* sym = unresolved_string_at(which);
762 oop str = StringTable::intern(sym, CHECK_(NULL));
763 assert(java_lang_String::is_instance(str), "must be string");
764 return str;
765 }
766
767
768 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) {
769 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
770
771 Handle bsm;
772 int argc;
773 {
774 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
775 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
776 // It is accompanied by the optional arguments.
777 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
778 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
779 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
780 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
781 }
782
783 // Extract the optional static arguments.
784 argc = this_cp->invoke_dynamic_argument_count_at(index);
785 if (argc == 0) return bsm_oop;
786
787 bsm = Handle(THREAD, bsm_oop);
788 }
789
790 objArrayHandle info;
791 {
792 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
793 info = objArrayHandle(THREAD, info_oop);
794 }
795
796 info->obj_at_put(0, bsm());
797 for (int i = 0; i < argc; i++) {
798 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
799 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
800 info->obj_at_put(1+i, arg_oop);
801 }
802
803 return info();
804 }
805
806 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
807 // If the string has already been interned, this entry will be non-null
808 oop str = this_cp->resolved_references()->obj_at(obj_index);
809 if (str != NULL) return str;
810 Symbol* sym = this_cp->unresolved_string_at(which);
811 str = StringTable::intern(sym, CHECK_(NULL));
812 this_cp->string_at_put(which, obj_index, str);
813 assert(java_lang_String::is_instance(str), "must be string");
814 return str;
815 }
816
817
818 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
819 int which) {
820 // Names are interned, so we can compare Symbol*s directly
821 Symbol* cp_name = klass_name_at(which);
822 return (cp_name == k->name());
823 }
824
825
826 // Iterate over symbols and decrement ones which are Symbol*s
827 // This is done during GC.
828 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
829 // these symbols but didn't increment the reference count.
830 void ConstantPool::unreference_symbols() {
831 for (int index = 1; index < length(); index++) { // Index 0 is unused
832 constantTag tag = tag_at(index);
833 if (tag.is_symbol()) {
834 symbol_at(index)->decrement_refcount();
835 }
836 }
837 }
838
839
840 // Compare this constant pool's entry at index1 to the constant pool
841 // cp2's entry at index2.
842 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
843 int index2, TRAPS) {
844
845 // The error tags are equivalent to non-error tags when comparing
846 jbyte t1 = tag_at(index1).non_error_value();
847 jbyte t2 = cp2->tag_at(index2).non_error_value();
848
849 if (t1 != t2) {
850 // Not the same entry type so there is nothing else to check. Note
851 // that this style of checking will consider resolved/unresolved
852 // class pairs as different.
853 // From the ConstantPool* API point of view, this is correct
854 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
855 // plays out in the context of ConstantPool* merging.
856 return false;
857 }
858
859 switch (t1) {
860 case JVM_CONSTANT_Class:
861 {
862 Klass* k1 = klass_at(index1, CHECK_false);
863 Klass* k2 = cp2->klass_at(index2, CHECK_false);
864 if (k1 == k2) {
865 return true;
866 }
867 } break;
868
869 case JVM_CONSTANT_ClassIndex:
870 {
871 int recur1 = klass_index_at(index1);
872 int recur2 = cp2->klass_index_at(index2);
873 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
874 if (match) {
875 return true;
876 }
877 } break;
878
879 case JVM_CONSTANT_Double:
880 {
881 jdouble d1 = double_at(index1);
882 jdouble d2 = cp2->double_at(index2);
883 if (d1 == d2) {
884 return true;
885 }
886 } break;
887
888 case JVM_CONSTANT_Fieldref:
889 case JVM_CONSTANT_InterfaceMethodref:
890 case JVM_CONSTANT_Methodref:
891 {
892 int recur1 = uncached_klass_ref_index_at(index1);
893 int recur2 = cp2->uncached_klass_ref_index_at(index2);
894 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
895 if (match) {
896 recur1 = uncached_name_and_type_ref_index_at(index1);
897 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
898 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
899 if (match) {
900 return true;
901 }
902 }
903 } break;
904
905 case JVM_CONSTANT_Float:
906 {
907 jfloat f1 = float_at(index1);
908 jfloat f2 = cp2->float_at(index2);
909 if (f1 == f2) {
910 return true;
911 }
912 } break;
913
914 case JVM_CONSTANT_Integer:
915 {
916 jint i1 = int_at(index1);
917 jint i2 = cp2->int_at(index2);
918 if (i1 == i2) {
919 return true;
920 }
921 } break;
922
923 case JVM_CONSTANT_Long:
924 {
925 jlong l1 = long_at(index1);
926 jlong l2 = cp2->long_at(index2);
927 if (l1 == l2) {
928 return true;
929 }
930 } break;
931
932 case JVM_CONSTANT_NameAndType:
933 {
934 int recur1 = name_ref_index_at(index1);
935 int recur2 = cp2->name_ref_index_at(index2);
936 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
937 if (match) {
938 recur1 = signature_ref_index_at(index1);
939 recur2 = cp2->signature_ref_index_at(index2);
940 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
941 if (match) {
942 return true;
943 }
944 }
945 } break;
946
947 case JVM_CONSTANT_StringIndex:
948 {
949 int recur1 = string_index_at(index1);
950 int recur2 = cp2->string_index_at(index2);
951 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
952 if (match) {
953 return true;
954 }
955 } break;
956
957 case JVM_CONSTANT_UnresolvedClass:
958 {
959 Symbol* k1 = klass_name_at(index1);
960 Symbol* k2 = cp2->klass_name_at(index2);
961 if (k1 == k2) {
962 return true;
963 }
964 } break;
965
966 case JVM_CONSTANT_MethodType:
967 {
968 int k1 = method_type_index_at(index1);
969 int k2 = cp2->method_type_index_at(index2);
970 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
971 if (match) {
972 return true;
973 }
974 } break;
975
976 case JVM_CONSTANT_MethodHandle:
977 {
978 int k1 = method_handle_ref_kind_at(index1);
979 int k2 = cp2->method_handle_ref_kind_at(index2);
980 if (k1 == k2) {
981 int i1 = method_handle_index_at(index1);
982 int i2 = cp2->method_handle_index_at(index2);
983 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
984 if (match) {
985 return true;
986 }
987 }
988 } break;
989
990 case JVM_CONSTANT_InvokeDynamic:
991 {
992 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
993 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
994 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
995 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
996 // separate statements and variables because CHECK_false is used
997 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
998 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
999 return (match_entry && match_operand);
1000 } break;
1001
1002 case JVM_CONSTANT_String:
1003 {
1004 Symbol* s1 = unresolved_string_at(index1);
1005 Symbol* s2 = cp2->unresolved_string_at(index2);
1006 if (s1 == s2) {
1007 return true;
1008 }
1009 } break;
1010
1011 case JVM_CONSTANT_Utf8:
1012 {
1013 Symbol* s1 = symbol_at(index1);
1014 Symbol* s2 = cp2->symbol_at(index2);
1015 if (s1 == s2) {
1016 return true;
1017 }
1018 } break;
1019
1020 // Invalid is used as the tag for the second constant pool entry
1021 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1022 // not be seen by itself.
1023 case JVM_CONSTANT_Invalid: // fall through
1024
1025 default:
1026 ShouldNotReachHere();
1027 break;
1028 }
1029
1030 return false;
1031 } // end compare_entry_to()
1032
1033
1034 // Resize the operands array with delta_len and delta_size.
1035 // Used in RedefineClasses for CP merge.
1036 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1037 int old_len = operand_array_length(operands());
1038 int new_len = old_len + delta_len;
1039 int min_len = (delta_len > 0) ? old_len : new_len;
1040
1041 int old_size = operands()->length();
1042 int new_size = old_size + delta_size;
1043 int min_size = (delta_size > 0) ? old_size : new_size;
1044
1045 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1046 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1047
1048 // Set index in the resized array for existing elements only
1049 for (int idx = 0; idx < min_len; idx++) {
1050 int offset = operand_offset_at(idx); // offset in original array
1051 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1052 }
1053 // Copy the bootstrap specifiers only
1054 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1055 new_ops->adr_at(2*new_len),
1056 (min_size - 2*min_len) * sizeof(u2));
1057 // Explicitly deallocate old operands array.
1058 // Note, it is not needed for 7u backport.
1059 if ( operands() != NULL) { // the safety check
1060 MetadataFactory::free_array<u2>(loader_data, operands());
1061 }
1062 set_operands(new_ops);
1063 } // end resize_operands()
1064
1065
1066 // Extend the operands array with the length and size of the ext_cp operands.
1067 // Used in RedefineClasses for CP merge.
1068 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1069 int delta_len = operand_array_length(ext_cp->operands());
1070 if (delta_len == 0) {
1071 return; // nothing to do
1072 }
1073 int delta_size = ext_cp->operands()->length();
1074
1075 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1076
1077 if (operand_array_length(operands()) == 0) {
1078 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1079 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1080 // The first element index defines the offset of second part
1081 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1082 set_operands(new_ops);
1083 } else {
1084 resize_operands(delta_len, delta_size, CHECK);
1085 }
1086
1087 } // end extend_operands()
1088
1089
1090 // Shrink the operands array to a smaller array with new_len length.
1091 // Used in RedefineClasses for CP merge.
1092 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1093 int old_len = operand_array_length(operands());
1094 if (new_len == old_len) {
1095 return; // nothing to do
1096 }
1097 assert(new_len < old_len, "shrunken operands array must be smaller");
1098
1099 int free_base = operand_next_offset_at(new_len - 1);
1100 int delta_len = new_len - old_len;
1101 int delta_size = 2*delta_len + free_base - operands()->length();
1102
1103 resize_operands(delta_len, delta_size, CHECK);
1104
1105 } // end shrink_operands()
1106
1107
1108 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1109 const constantPoolHandle& to_cp,
1110 TRAPS) {
1111
1112 int from_oplen = operand_array_length(from_cp->operands());
1113 int old_oplen = operand_array_length(to_cp->operands());
1114 if (from_oplen != 0) {
1115 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1116 // append my operands to the target's operands array
1117 if (old_oplen == 0) {
1118 // Can't just reuse from_cp's operand list because of deallocation issues
1119 int len = from_cp->operands()->length();
1120 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1121 Copy::conjoint_memory_atomic(
1122 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1123 to_cp->set_operands(new_ops);
1124 } else {
1125 int old_len = to_cp->operands()->length();
1126 int from_len = from_cp->operands()->length();
1127 int old_off = old_oplen * sizeof(u2);
1128 int from_off = from_oplen * sizeof(u2);
1129 // Use the metaspace for the destination constant pool
1130 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1131 int fillp = 0, len = 0;
1132 // first part of dest
1133 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1134 new_operands->adr_at(fillp),
1135 (len = old_off) * sizeof(u2));
1136 fillp += len;
1137 // first part of src
1138 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1139 new_operands->adr_at(fillp),
1140 (len = from_off) * sizeof(u2));
1141 fillp += len;
1142 // second part of dest
1143 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1144 new_operands->adr_at(fillp),
1145 (len = old_len - old_off) * sizeof(u2));
1146 fillp += len;
1147 // second part of src
1148 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1149 new_operands->adr_at(fillp),
1150 (len = from_len - from_off) * sizeof(u2));
1151 fillp += len;
1152 assert(fillp == new_operands->length(), "");
1153
1154 // Adjust indexes in the first part of the copied operands array.
1155 for (int j = 0; j < from_oplen; j++) {
1156 int offset = operand_offset_at(new_operands, old_oplen + j);
1157 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1158 offset += old_len; // every new tuple is preceded by old_len extra u2's
1159 operand_offset_at_put(new_operands, old_oplen + j, offset);
1160 }
1161
1162 // replace target operands array with combined array
1163 to_cp->set_operands(new_operands);
1164 }
1165 }
1166 } // end copy_operands()
1167
1168
1169 // Copy this constant pool's entries at start_i to end_i (inclusive)
1170 // to the constant pool to_cp's entries starting at to_i. A total of
1171 // (end_i - start_i) + 1 entries are copied.
1172 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1173 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1174
1175
1176 int dest_i = to_i; // leave original alone for debug purposes
1177
1178 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1179 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1180
1181 switch (from_cp->tag_at(src_i).value()) {
1182 case JVM_CONSTANT_Double:
1183 case JVM_CONSTANT_Long:
1184 // double and long take two constant pool entries
1185 src_i += 2;
1186 dest_i += 2;
1187 break;
1188
1189 default:
1190 // all others take one constant pool entry
1191 src_i++;
1192 dest_i++;
1193 break;
1194 }
1195 }
1196 copy_operands(from_cp, to_cp, CHECK);
1197
1198 } // end copy_cp_to_impl()
1199
1200
1201 // Copy this constant pool's entry at from_i to the constant pool
1202 // to_cp's entry at to_i.
1203 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1204 const constantPoolHandle& to_cp, int to_i,
1205 TRAPS) {
1206
1207 int tag = from_cp->tag_at(from_i).value();
1208 switch (tag) {
1209 case JVM_CONSTANT_Class:
1210 {
1211 Klass* k = from_cp->klass_at(from_i, CHECK);
1212 to_cp->klass_at_put(to_i, k);
1213 } break;
1214
1215 case JVM_CONSTANT_ClassIndex:
1216 {
1217 jint ki = from_cp->klass_index_at(from_i);
1218 to_cp->klass_index_at_put(to_i, ki);
1219 } break;
1220
1221 case JVM_CONSTANT_Double:
1222 {
1223 jdouble d = from_cp->double_at(from_i);
1224 to_cp->double_at_put(to_i, d);
1225 // double takes two constant pool entries so init second entry's tag
1226 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1227 } break;
1228
1229 case JVM_CONSTANT_Fieldref:
1230 {
1231 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1232 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1233 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1234 } break;
1235
1236 case JVM_CONSTANT_Float:
1237 {
1238 jfloat f = from_cp->float_at(from_i);
1239 to_cp->float_at_put(to_i, f);
1240 } break;
1241
1242 case JVM_CONSTANT_Integer:
1243 {
1244 jint i = from_cp->int_at(from_i);
1245 to_cp->int_at_put(to_i, i);
1246 } break;
1247
1248 case JVM_CONSTANT_InterfaceMethodref:
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->interface_method_at_put(to_i, class_index, name_and_type_index);
1253 } break;
1254
1255 case JVM_CONSTANT_Long:
1256 {
1257 jlong l = from_cp->long_at(from_i);
1258 to_cp->long_at_put(to_i, l);
1259 // long takes two constant pool entries so init second entry's tag
1260 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1261 } break;
1262
1263 case JVM_CONSTANT_Methodref:
1264 {
1265 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1266 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1267 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1268 } break;
1269
1270 case JVM_CONSTANT_NameAndType:
1271 {
1272 int name_ref_index = from_cp->name_ref_index_at(from_i);
1273 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1274 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1275 } break;
1276
1277 case JVM_CONSTANT_StringIndex:
1278 {
1279 jint si = from_cp->string_index_at(from_i);
1280 to_cp->string_index_at_put(to_i, si);
1281 } break;
1282
1283 case JVM_CONSTANT_UnresolvedClass:
1284 case JVM_CONSTANT_UnresolvedClassInError:
1285 {
1286 // Can be resolved after checking tag, so check the slot first.
1287 CPSlot entry = from_cp->slot_at(from_i);
1288 if (entry.is_resolved()) {
1289 assert(entry.get_klass()->is_klass(), "must be");
1290 // Already resolved
1291 to_cp->klass_at_put(to_i, entry.get_klass());
1292 } else {
1293 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1294 }
1295 } break;
1296
1297 case JVM_CONSTANT_String:
1298 {
1299 Symbol* s = from_cp->unresolved_string_at(from_i);
1300 to_cp->unresolved_string_at_put(to_i, s);
1301 } break;
1302
1303 case JVM_CONSTANT_Utf8:
1304 {
1305 Symbol* s = from_cp->symbol_at(from_i);
1306 // Need to increase refcount, the old one will be thrown away and deferenced
1307 s->increment_refcount();
1308 to_cp->symbol_at_put(to_i, s);
1309 } break;
1310
1311 case JVM_CONSTANT_MethodType:
1312 case JVM_CONSTANT_MethodTypeInError:
1313 {
1314 jint k = from_cp->method_type_index_at(from_i);
1315 to_cp->method_type_index_at_put(to_i, k);
1316 } break;
1317
1318 case JVM_CONSTANT_MethodHandle:
1319 case JVM_CONSTANT_MethodHandleInError:
1320 {
1321 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1322 int k2 = from_cp->method_handle_index_at(from_i);
1323 to_cp->method_handle_index_at_put(to_i, k1, k2);
1324 } break;
1325
1326 case JVM_CONSTANT_InvokeDynamic:
1327 {
1328 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1329 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1330 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1331 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1332 } break;
1333
1334 // Invalid is used as the tag for the second constant pool entry
1335 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1336 // not be seen by itself.
1337 case JVM_CONSTANT_Invalid: // fall through
1338
1339 default:
1340 {
1341 ShouldNotReachHere();
1342 } break;
1343 }
1344 } // end copy_entry_to()
1345
1346
1347 // Search constant pool search_cp for an entry that matches this
1348 // constant pool's entry at pattern_i. Returns the index of a
1349 // matching entry or zero (0) if there is no matching entry.
1350 int ConstantPool::find_matching_entry(int pattern_i,
1351 const constantPoolHandle& search_cp, TRAPS) {
1352
1353 // index zero (0) is not used
1354 for (int i = 1; i < search_cp->length(); i++) {
1355 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1356 if (found) {
1357 return i;
1358 }
1359 }
1360
1361 return 0; // entry not found; return unused index zero (0)
1362 } // end find_matching_entry()
1363
1364
1365 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1366 // cp2's bootstrap specifier at idx2.
1367 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1368 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1369 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1370 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1371
1372 if (!match) {
1373 return false;
1374 }
1375 int argc = operand_argument_count_at(idx1);
1376 if (argc == cp2->operand_argument_count_at(idx2)) {
1377 for (int j = 0; j < argc; j++) {
1378 k1 = operand_argument_index_at(idx1, j);
1379 k2 = cp2->operand_argument_index_at(idx2, j);
1380 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1381 if (!match) {
1382 return false;
1383 }
1384 }
1385 return true; // got through loop; all elements equal
1386 }
1387 return false;
1388 } // end compare_operand_to()
1389
1390 // Search constant pool search_cp for a bootstrap specifier that matches
1391 // this constant pool's bootstrap specifier at pattern_i index.
1392 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1393 int ConstantPool::find_matching_operand(int pattern_i,
1394 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1395 for (int i = 0; i < search_len; i++) {
1396 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1397 if (found) {
1398 return i;
1399 }
1400 }
1401 return -1; // bootstrap specifier not found; return unused index (-1)
1402 } // end find_matching_operand()
1403
1404
1405 #ifndef PRODUCT
1406
1407 const char* ConstantPool::printable_name_at(int which) {
1408
1409 constantTag tag = tag_at(which);
1410
1411 if (tag.is_string()) {
1412 return string_at_noresolve(which);
1413 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1414 return klass_name_at(which)->as_C_string();
1415 } else if (tag.is_symbol()) {
1416 return symbol_at(which)->as_C_string();
1417 }
1418 return "";
1419 }
1420
1421 #endif // PRODUCT
1422
1423
1424 // JVMTI GetConstantPool support
1425
1426 // For debugging of constant pool
1427 const bool debug_cpool = false;
1428
1429 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1430
1431 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1432 const char* WARN_MSG = "Must not be such entry!";
1433 jint size = 0;
1434 u2 idx1, idx2;
1435
1436 for (jint idx = 1; idx < cnt; idx++) {
1437 jint ent_size = 0;
1438 u1 tag = *bytes++;
1439 size++; // count tag
1440
1441 printf("const #%03d, tag: %02d ", idx, tag);
1442 switch(tag) {
1443 case JVM_CONSTANT_Invalid: {
1444 printf("Invalid");
1445 break;
1446 }
1447 case JVM_CONSTANT_Unicode: {
1448 printf("Unicode %s", WARN_MSG);
1449 break;
1450 }
1451 case JVM_CONSTANT_Utf8: {
1452 u2 len = Bytes::get_Java_u2(bytes);
1453 char str[128];
1454 if (len > 127) {
1455 len = 127;
1456 }
1457 strncpy(str, (char *) (bytes+2), len);
1458 str[len] = '\0';
1459 printf("Utf8 \"%s\"", str);
1460 ent_size = 2 + len;
1461 break;
1462 }
1463 case JVM_CONSTANT_Integer: {
1464 u4 val = Bytes::get_Java_u4(bytes);
1465 printf("int %d", *(int *) &val);
1466 ent_size = 4;
1467 break;
1468 }
1469 case JVM_CONSTANT_Float: {
1470 u4 val = Bytes::get_Java_u4(bytes);
1471 printf("float %5.3ff", *(float *) &val);
1472 ent_size = 4;
1473 break;
1474 }
1475 case JVM_CONSTANT_Long: {
1476 u8 val = Bytes::get_Java_u8(bytes);
1477 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1478 ent_size = 8;
1479 idx++; // Long takes two cpool slots
1480 break;
1481 }
1482 case JVM_CONSTANT_Double: {
1483 u8 val = Bytes::get_Java_u8(bytes);
1484 printf("double %5.3fd", *(jdouble *)&val);
1485 ent_size = 8;
1486 idx++; // Double takes two cpool slots
1487 break;
1488 }
1489 case JVM_CONSTANT_Class: {
1490 idx1 = Bytes::get_Java_u2(bytes);
1491 printf("class #%03d", idx1);
1492 ent_size = 2;
1493 break;
1494 }
1495 case JVM_CONSTANT_String: {
1496 idx1 = Bytes::get_Java_u2(bytes);
1497 printf("String #%03d", idx1);
1498 ent_size = 2;
1499 break;
1500 }
1501 case JVM_CONSTANT_Fieldref: {
1502 idx1 = Bytes::get_Java_u2(bytes);
1503 idx2 = Bytes::get_Java_u2(bytes+2);
1504 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1505 ent_size = 4;
1506 break;
1507 }
1508 case JVM_CONSTANT_Methodref: {
1509 idx1 = Bytes::get_Java_u2(bytes);
1510 idx2 = Bytes::get_Java_u2(bytes+2);
1511 printf("Method #%03d, #%03d", idx1, idx2);
1512 ent_size = 4;
1513 break;
1514 }
1515 case JVM_CONSTANT_InterfaceMethodref: {
1516 idx1 = Bytes::get_Java_u2(bytes);
1517 idx2 = Bytes::get_Java_u2(bytes+2);
1518 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1519 ent_size = 4;
1520 break;
1521 }
1522 case JVM_CONSTANT_NameAndType: {
1523 idx1 = Bytes::get_Java_u2(bytes);
1524 idx2 = Bytes::get_Java_u2(bytes+2);
1525 printf("NameAndType #%03d, #%03d", idx1, idx2);
1526 ent_size = 4;
1527 break;
1528 }
1529 case JVM_CONSTANT_ClassIndex: {
1530 printf("ClassIndex %s", WARN_MSG);
1531 break;
1532 }
1533 case JVM_CONSTANT_UnresolvedClass: {
1534 printf("UnresolvedClass: %s", WARN_MSG);
1535 break;
1536 }
1537 case JVM_CONSTANT_UnresolvedClassInError: {
1538 printf("UnresolvedClassInErr: %s", WARN_MSG);
1539 break;
1540 }
1541 case JVM_CONSTANT_StringIndex: {
1542 printf("StringIndex: %s", WARN_MSG);
1543 break;
1544 }
1545 }
1546 printf(";\n");
1547 bytes += ent_size;
1548 size += ent_size;
1549 }
1550 printf("Cpool size: %d\n", size);
1551 fflush(0);
1552 return;
1553 } /* end print_cpool_bytes */
1554
1555
1556 // Returns size of constant pool entry.
1557 jint ConstantPool::cpool_entry_size(jint idx) {
1558 switch(tag_at(idx).value()) {
1559 case JVM_CONSTANT_Invalid:
1560 case JVM_CONSTANT_Unicode:
1561 return 1;
1562
1563 case JVM_CONSTANT_Utf8:
1564 return 3 + symbol_at(idx)->utf8_length();
1565
1566 case JVM_CONSTANT_Class:
1567 case JVM_CONSTANT_String:
1568 case JVM_CONSTANT_ClassIndex:
1569 case JVM_CONSTANT_UnresolvedClass:
1570 case JVM_CONSTANT_UnresolvedClassInError:
1571 case JVM_CONSTANT_StringIndex:
1572 case JVM_CONSTANT_MethodType:
1573 case JVM_CONSTANT_MethodTypeInError:
1574 return 3;
1575
1576 case JVM_CONSTANT_MethodHandle:
1577 case JVM_CONSTANT_MethodHandleInError:
1578 return 4; //tag, ref_kind, ref_index
1579
1580 case JVM_CONSTANT_Integer:
1581 case JVM_CONSTANT_Float:
1582 case JVM_CONSTANT_Fieldref:
1583 case JVM_CONSTANT_Methodref:
1584 case JVM_CONSTANT_InterfaceMethodref:
1585 case JVM_CONSTANT_NameAndType:
1586 return 5;
1587
1588 case JVM_CONSTANT_InvokeDynamic:
1589 // u1 tag, u2 bsm, u2 nt
1590 return 5;
1591
1592 case JVM_CONSTANT_Long:
1593 case JVM_CONSTANT_Double:
1594 return 9;
1595 }
1596 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1597 return 1;
1598 } /* end cpool_entry_size */
1599
1600
1601 // SymbolHashMap is used to find a constant pool index from a string.
1602 // This function fills in SymbolHashMaps, one for utf8s and one for
1603 // class names, returns size of the cpool raw bytes.
1604 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1605 SymbolHashMap *classmap) {
1606 jint size = 0;
1607
1608 for (u2 idx = 1; idx < length(); idx++) {
1609 u2 tag = tag_at(idx).value();
1610 size += cpool_entry_size(idx);
1611
1612 switch(tag) {
1613 case JVM_CONSTANT_Utf8: {
1614 Symbol* sym = symbol_at(idx);
1615 symmap->add_entry(sym, idx);
1616 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1617 break;
1618 }
1619 case JVM_CONSTANT_Class:
1620 case JVM_CONSTANT_UnresolvedClass:
1621 case JVM_CONSTANT_UnresolvedClassInError: {
1622 Symbol* sym = klass_name_at(idx);
1623 classmap->add_entry(sym, idx);
1624 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1625 break;
1626 }
1627 case JVM_CONSTANT_Long:
1628 case JVM_CONSTANT_Double: {
1629 idx++; // Both Long and Double take two cpool slots
1630 break;
1631 }
1632 }
1633 }
1634 return size;
1635 } /* end hash_utf8_entries_to */
1636
1637
1638 // Copy cpool bytes.
1639 // Returns:
1640 // 0, in case of OutOfMemoryError
1641 // -1, in case of internal error
1642 // > 0, count of the raw cpool bytes that have been copied
1643 int ConstantPool::copy_cpool_bytes(int cpool_size,
1644 SymbolHashMap* tbl,
1645 unsigned char *bytes) {
1646 u2 idx1, idx2;
1647 jint size = 0;
1648 jint cnt = length();
1649 unsigned char *start_bytes = bytes;
1650
1651 for (jint idx = 1; idx < cnt; idx++) {
1652 u1 tag = tag_at(idx).value();
1653 jint ent_size = cpool_entry_size(idx);
1654
1655 assert(size + ent_size <= cpool_size, "Size mismatch");
1656
1657 *bytes = tag;
1658 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1659 switch(tag) {
1660 case JVM_CONSTANT_Invalid: {
1661 DBG(printf("JVM_CONSTANT_Invalid"));
1662 break;
1663 }
1664 case JVM_CONSTANT_Unicode: {
1665 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1666 DBG(printf("JVM_CONSTANT_Unicode"));
1667 break;
1668 }
1669 case JVM_CONSTANT_Utf8: {
1670 Symbol* sym = symbol_at(idx);
1671 char* str = sym->as_utf8();
1672 // Warning! It's crashing on x86 with len = sym->utf8_length()
1673 int len = (int) strlen(str);
1674 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1675 for (int i = 0; i < len; i++) {
1676 bytes[3+i] = (u1) str[i];
1677 }
1678 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1679 break;
1680 }
1681 case JVM_CONSTANT_Integer: {
1682 jint val = int_at(idx);
1683 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1684 break;
1685 }
1686 case JVM_CONSTANT_Float: {
1687 jfloat val = float_at(idx);
1688 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1689 break;
1690 }
1691 case JVM_CONSTANT_Long: {
1692 jlong val = long_at(idx);
1693 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1694 idx++; // Long takes two cpool slots
1695 break;
1696 }
1697 case JVM_CONSTANT_Double: {
1698 jdouble val = double_at(idx);
1699 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1700 idx++; // Double takes two cpool slots
1701 break;
1702 }
1703 case JVM_CONSTANT_Class:
1704 case JVM_CONSTANT_UnresolvedClass:
1705 case JVM_CONSTANT_UnresolvedClassInError: {
1706 *bytes = JVM_CONSTANT_Class;
1707 Symbol* sym = klass_name_at(idx);
1708 idx1 = tbl->symbol_to_value(sym);
1709 assert(idx1 != 0, "Have not found a hashtable entry");
1710 Bytes::put_Java_u2((address) (bytes+1), idx1);
1711 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1712 break;
1713 }
1714 case JVM_CONSTANT_String: {
1715 *bytes = JVM_CONSTANT_String;
1716 Symbol* sym = unresolved_string_at(idx);
1717 idx1 = tbl->symbol_to_value(sym);
1718 assert(idx1 != 0, "Have not found a hashtable entry");
1719 Bytes::put_Java_u2((address) (bytes+1), idx1);
1720 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1721 break;
1722 }
1723 case JVM_CONSTANT_Fieldref:
1724 case JVM_CONSTANT_Methodref:
1725 case JVM_CONSTANT_InterfaceMethodref: {
1726 idx1 = uncached_klass_ref_index_at(idx);
1727 idx2 = uncached_name_and_type_ref_index_at(idx);
1728 Bytes::put_Java_u2((address) (bytes+1), idx1);
1729 Bytes::put_Java_u2((address) (bytes+3), idx2);
1730 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1731 break;
1732 }
1733 case JVM_CONSTANT_NameAndType: {
1734 idx1 = name_ref_index_at(idx);
1735 idx2 = signature_ref_index_at(idx);
1736 Bytes::put_Java_u2((address) (bytes+1), idx1);
1737 Bytes::put_Java_u2((address) (bytes+3), idx2);
1738 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1739 break;
1740 }
1741 case JVM_CONSTANT_ClassIndex: {
1742 *bytes = JVM_CONSTANT_Class;
1743 idx1 = klass_index_at(idx);
1744 Bytes::put_Java_u2((address) (bytes+1), idx1);
1745 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1746 break;
1747 }
1748 case JVM_CONSTANT_StringIndex: {
1749 *bytes = JVM_CONSTANT_String;
1750 idx1 = string_index_at(idx);
1751 Bytes::put_Java_u2((address) (bytes+1), idx1);
1752 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1753 break;
1754 }
1755 case JVM_CONSTANT_MethodHandle:
1756 case JVM_CONSTANT_MethodHandleInError: {
1757 *bytes = JVM_CONSTANT_MethodHandle;
1758 int kind = method_handle_ref_kind_at(idx);
1759 idx1 = method_handle_index_at(idx);
1760 *(bytes+1) = (unsigned char) kind;
1761 Bytes::put_Java_u2((address) (bytes+2), idx1);
1762 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1763 break;
1764 }
1765 case JVM_CONSTANT_MethodType:
1766 case JVM_CONSTANT_MethodTypeInError: {
1767 *bytes = JVM_CONSTANT_MethodType;
1768 idx1 = method_type_index_at(idx);
1769 Bytes::put_Java_u2((address) (bytes+1), idx1);
1770 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1771 break;
1772 }
1773 case JVM_CONSTANT_InvokeDynamic: {
1774 *bytes = tag;
1775 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1776 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1777 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1778 Bytes::put_Java_u2((address) (bytes+1), idx1);
1779 Bytes::put_Java_u2((address) (bytes+3), idx2);
1780 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1781 break;
1782 }
1783 }
1784 DBG(printf("\n"));
1785 bytes += ent_size;
1786 size += ent_size;
1787 }
1788 assert(size == cpool_size, "Size mismatch");
1789
1790 // Keep temorarily for debugging until it's stable.
1791 DBG(print_cpool_bytes(cnt, start_bytes));
1792 return (int)(bytes - start_bytes);
1793 } /* end copy_cpool_bytes */
1794
1795 #undef DBG
1796
1797
1798 void ConstantPool::set_on_stack(const bool value) {
1799 if (value) {
1800 // Only record if it's not already set.
1801 if (!on_stack()) {
1802 _flags |= _on_stack;
1803 MetadataOnStackMark::record(this);
1804 }
1805 } else {
1806 // Clearing is done single-threadedly.
1807 _flags &= ~_on_stack;
1808 }
1809 }
1810
1811 // JSR 292 support for patching constant pool oops after the class is linked and
1812 // the oop array for resolved references are created.
1813 // We can't do this during classfile parsing, which is how the other indexes are
1814 // patched. The other patches are applied early for some error checking
1815 // so only defer the pseudo_strings.
1816 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
1817 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1818 Handle patch = cp_patches->at(index);
1819 if (patch.not_null()) {
1820 assert (tag_at(index).is_string(), "should only be string left");
1821 // Patching a string means pre-resolving it.
1822 // The spelling in the constant pool is ignored.
1823 // The constant reference may be any object whatever.
1824 // If it is not a real interned string, the constant is referred
1825 // to as a "pseudo-string", and must be presented to the CP
1826 // explicitly, because it may require scavenging.
1827 int obj_index = cp_to_object_index(index);
1828 pseudo_string_at_put(index, obj_index, patch());
1829 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1830 }
1831 }
1832 #ifdef ASSERT
1833 // Ensure that all the patches have been used.
1834 for (int index = 0; index < cp_patches->length(); index++) {
1835 assert(cp_patches->at(index).is_null(),
1836 "Unused constant pool patch at %d in class file %s",
1837 index,
1838 pool_holder()->external_name());
1839 }
1840 #endif // ASSERT
1841 }
1842
1843 #ifndef PRODUCT
1844
1845 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1846 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1847 guarantee(obj->is_constantPool(), "object must be constant pool");
1848 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1849 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1850
1851 for (int i = 0; i< cp->length(); i++) {
1852 if (cp->tag_at(i).is_unresolved_klass()) {
1853 // This will force loading of the class
1854 Klass* klass = cp->klass_at(i, CHECK);
1855 if (klass->is_instance_klass()) {
1856 // Force initialization of class
1857 InstanceKlass::cast(klass)->initialize(CHECK);
1858 }
1859 }
1860 }
1861 }
1862
1863 #endif
1864
1865
1866 // Printing
1867
1868 void ConstantPool::print_on(outputStream* st) const {
1869 assert(is_constantPool(), "must be constantPool");
1870 st->print_cr("%s", internal_name());
1871 if (flags() != 0) {
1872 st->print(" - flags: 0x%x", flags());
1873 if (has_preresolution()) st->print(" has_preresolution");
1874 if (on_stack()) st->print(" on_stack");
1875 st->cr();
1876 }
1877 if (pool_holder() != NULL) {
1878 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
1879 }
1880 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
1881 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
1882 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
1883
1884 for (int index = 1; index < length(); index++) { // Index 0 is unused
1885 ((ConstantPool*)this)->print_entry_on(index, st);
1886 switch (tag_at(index).value()) {
1887 case JVM_CONSTANT_Long :
1888 case JVM_CONSTANT_Double :
1889 index++; // Skip entry following eigth-byte constant
1890 }
1891
1892 }
1893 st->cr();
1894 }
1895
1896 // Print one constant pool entry
1897 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1898 EXCEPTION_MARK;
1899 st->print(" - %3d : ", index);
1900 tag_at(index).print_on(st);
1901 st->print(" : ");
1902 switch (tag_at(index).value()) {
1903 case JVM_CONSTANT_Class :
1904 { Klass* k = klass_at(index, CATCH);
1905 guarantee(k != NULL, "need klass");
1906 k->print_value_on(st);
1907 st->print(" {" PTR_FORMAT "}", p2i(k));
1908 }
1909 break;
1910 case JVM_CONSTANT_Fieldref :
1911 case JVM_CONSTANT_Methodref :
1912 case JVM_CONSTANT_InterfaceMethodref :
1913 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1914 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1915 break;
1916 case JVM_CONSTANT_String :
1917 if (is_pseudo_string_at(index)) {
1918 oop anObj = pseudo_string_at(index);
1919 anObj->print_value_on(st);
1920 st->print(" {" PTR_FORMAT "}", p2i(anObj));
1921 } else {
1922 unresolved_string_at(index)->print_value_on(st);
1923 }
1924 break;
1925 case JVM_CONSTANT_Integer :
1926 st->print("%d", int_at(index));
1927 break;
1928 case JVM_CONSTANT_Float :
1929 st->print("%f", float_at(index));
1930 break;
1931 case JVM_CONSTANT_Long :
1932 st->print_jlong(long_at(index));
1933 break;
1934 case JVM_CONSTANT_Double :
1935 st->print("%lf", double_at(index));
1936 break;
1937 case JVM_CONSTANT_NameAndType :
1938 st->print("name_index=%d", name_ref_index_at(index));
1939 st->print(" signature_index=%d", signature_ref_index_at(index));
1940 break;
1941 case JVM_CONSTANT_Utf8 :
1942 symbol_at(index)->print_value_on(st);
1943 break;
1944 case JVM_CONSTANT_UnresolvedClass : // fall-through
1945 case JVM_CONSTANT_UnresolvedClassInError: {
1946 CPSlot entry = slot_at(index);
1947 if (entry.is_resolved()) {
1948 entry.get_klass()->print_value_on(st);
1949 } else {
1950 entry.get_symbol()->print_value_on(st);
1951 }
1952 }
1953 break;
1954 case JVM_CONSTANT_MethodHandle :
1955 case JVM_CONSTANT_MethodHandleInError :
1956 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
1957 st->print(" ref_index=%d", method_handle_index_at(index));
1958 break;
1959 case JVM_CONSTANT_MethodType :
1960 case JVM_CONSTANT_MethodTypeInError :
1961 st->print("signature_index=%d", method_type_index_at(index));
1962 break;
1963 case JVM_CONSTANT_InvokeDynamic :
1964 {
1965 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1966 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1967 int argc = invoke_dynamic_argument_count_at(index);
1968 if (argc > 0) {
1969 for (int arg_i = 0; arg_i < argc; arg_i++) {
1970 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1971 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1972 }
1973 st->print("}");
1974 }
1975 }
1976 break;
1977 default:
1978 ShouldNotReachHere();
1979 break;
1980 }
1981 st->cr();
1982 }
1983
1984 void ConstantPool::print_value_on(outputStream* st) const {
1985 assert(is_constantPool(), "must be constantPool");
1986 st->print("constant pool [%d]", length());
1987 if (has_preresolution()) st->print("/preresolution");
1988 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
1989 print_address_on(st);
1990 st->print(" for ");
1991 pool_holder()->print_value_on(st);
1992 if (pool_holder() != NULL) {
1993 bool extra = (pool_holder()->constants() != this);
1994 if (extra) st->print(" (extra)");
1995 }
1996 if (cache() != NULL) {
1997 st->print(" cache=" PTR_FORMAT, p2i(cache()));
1998 }
1999 }
2000
2001 #if INCLUDE_SERVICES
2002 // Size Statistics
2003 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2004 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2005 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2006 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2007 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2008 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2009
2010 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2011 sz->_cp_refmap_bytes;
2012 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2013 }
2014 #endif // INCLUDE_SERVICES
2015
2016 // Verification
2017
2018 void ConstantPool::verify_on(outputStream* st) {
2019 guarantee(is_constantPool(), "object must be constant pool");
2020 for (int i = 0; i< length(); i++) {
2021 constantTag tag = tag_at(i);
2022 CPSlot entry = slot_at(i);
2023 if (tag.is_klass()) {
2024 if (entry.is_resolved()) {
2025 guarantee(entry.get_klass()->is_klass(), "should be klass");
2026 }
2027 } else if (tag.is_unresolved_klass()) {
2028 if (entry.is_resolved()) {
2029 guarantee(entry.get_klass()->is_klass(), "should be klass");
2030 }
2031 } else if (tag.is_symbol()) {
2032 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2033 } else if (tag.is_string()) {
2034 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2035 }
2036 }
2037 if (cache() != NULL) {
2038 // Note: cache() can be NULL before a class is completely setup or
2039 // in temporary constant pools used during constant pool merging
2040 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2041 }
2042 if (pool_holder() != NULL) {
2043 // Note: pool_holder() can be NULL in temporary constant pools
2044 // used during constant pool merging
2045 guarantee(pool_holder()->is_klass(), "should be klass");
2046 }
2047 }
2048
2049
2050 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2051 char *str = sym->as_utf8();
2052 unsigned int hash = compute_hash(str, sym->utf8_length());
2053 unsigned int index = hash % table_size();
2054
2055 // check if already in map
2056 // we prefer the first entry since it is more likely to be what was used in
2057 // the class file
2058 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2059 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2060 if (en->hash() == hash && en->symbol() == sym) {
2061 return; // already there
2062 }
2063 }
2064
2065 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2066 entry->set_next(bucket(index));
2067 _buckets[index].set_entry(entry);
2068 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2069 }
2070
2071 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2072 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2073 char *str = sym->as_utf8();
2074 int len = sym->utf8_length();
2075 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2076 unsigned int index = hash % table_size();
2077 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2078 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2079 if (en->hash() == hash && en->symbol() == sym) {
2080 return en;
2081 }
2082 }
2083 return NULL;
2084 }