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 _flags(0) {
85
86 assert(_tags != NULL, "invariant");
87 assert(tags->length() == _length, "invariant");
88 assert(tag_array_is_zero_initialized(tags), "invariant");
89 assert(0 == _flags, "invariant");
90 assert(0 == version(), "invariant");
91 assert(NULL == _pool_holder, "invariant");
92 }
93
94 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
95 MetadataFactory::free_metadata(loader_data, cache());
96 set_cache(NULL);
97 MetadataFactory::free_array<u2>(loader_data, reference_map());
98 set_reference_map(NULL);
99
100 MetadataFactory::free_array<jushort>(loader_data, operands());
101 set_operands(NULL);
102
103 release_C_heap_structures();
104
105 // free tag array
106 MetadataFactory::free_array<u1>(loader_data, tags());
107 set_tags(NULL);
108 }
109
110 void ConstantPool::release_C_heap_structures() {
111 // walk constant pool and decrement symbol reference counts
112 unreference_symbols();
113 }
114
115 objArrayOop ConstantPool::resolved_references() const {
116 return (objArrayOop)JNIHandles::resolve(_resolved_references);
117 }
118
119 // Create resolved_references array and mapping array for original cp indexes
120 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
121 // to map it back for resolving and some unlikely miscellaneous uses.
122 // The objects created by invokedynamic are appended to this list.
123 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
124 const intStack& reference_map,
125 int constant_pool_map_length,
126 TRAPS) {
127 // Initialized the resolved object cache.
128 int map_length = reference_map.length();
129 if (map_length > 0) {
130 // Only need mapping back to constant pool entries. The map isn't used for
131 // invokedynamic resolved_reference entries. For invokedynamic entries,
132 // the constant pool cache index has the mapping back to both the constant
133 // pool and to the resolved reference index.
134 if (constant_pool_map_length > 0) {
135 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
136
137 for (int i = 0; i < constant_pool_map_length; i++) {
138 int x = reference_map.at(i);
139 assert(x == (int)(jushort) x, "klass index is too big");
140 om->at_put(i, (jushort)x);
141 }
142 set_reference_map(om);
143 }
144
145 // Create Java array for holding resolved strings, methodHandles,
146 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
147 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
148 Handle refs_handle (THREAD, (oop)stom); // must handleize.
149 set_resolved_references(loader_data->add_handle(refs_handle));
150 }
151 }
152
153 // CDS support. Create a new resolved_references array.
154 void ConstantPool::restore_unshareable_info(TRAPS) {
155
156 // Only create the new resolved references array if it hasn't been attempted before
157 if (resolved_references() != NULL) return;
158
159 // restore the C++ vtable from the shared archive
160 restore_vtable();
161
162 if (SystemDictionary::Object_klass_loaded()) {
163 // Recreate the object array and add to ClassLoaderData.
164 int map_length = resolved_reference_length();
165 if (map_length > 0) {
166 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
167 Handle refs_handle (THREAD, (oop)stom); // must handleize.
168
169 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
170 set_resolved_references(loader_data->add_handle(refs_handle));
171 }
172 }
173 }
174
175 void ConstantPool::remove_unshareable_info() {
176 // Resolved references are not in the shared archive.
177 // Save the length for restoration. It is not necessarily the same length
178 // as reference_map.length() if invokedynamic is saved.
179 set_resolved_reference_length(
180 resolved_references() != NULL ? resolved_references()->length() : 0);
181 set_resolved_references(NULL);
182 }
183
184 int ConstantPool::cp_to_object_index(int cp_index) {
185 // this is harder don't do this so much.
186 int i = reference_map()->find(cp_index);
187 // We might not find the index for jsr292 call.
188 return (i < 0) ? _no_index_sentinel : i;
189 }
190
191 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
192 resolved_references()->obj_at_put(obj_index, str);
193 }
194
195 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, KlassHandle k) {
196 ResourceMark rm;
197 int line_number = -1;
198 const char * source_file = NULL;
199 if (JavaThread::current()->has_last_Java_frame()) {
200 // try to identify the method which called this function.
201 vframeStream vfst(JavaThread::current());
202 if (!vfst.at_end()) {
203 line_number = vfst.method()->line_number_from_bci(vfst.bci());
204 Symbol* s = vfst.method()->method_holder()->source_file_name();
205 if (s != NULL) {
206 source_file = s->as_C_string();
207 }
208 }
209 }
210 if (k() != this_cp->pool_holder()) {
211 // only print something if the classes are different
212 if (source_file != NULL) {
213 log_debug(class, resolve)("%s %s %s:%d",
214 this_cp->pool_holder()->external_name(),
215 k->external_name(), source_file, line_number);
216 } else {
217 log_debug(class, resolve)("%s %s",
218 this_cp->pool_holder()->external_name(),
219 k->external_name());
220 }
221 }
222 }
223
224 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
225 bool save_resolution_error, TRAPS) {
226 assert(THREAD->is_Java_thread(), "must be a Java thread");
227
228 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
229 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
230 // the entry and tag is not updated atomicly.
231 CPSlot entry = this_cp->slot_at(which);
232 if (entry.is_resolved()) {
233 assert(entry.get_klass()->is_klass(), "must be");
234 // Already resolved - return entry.
235 return entry.get_klass();
236 }
237
238 // This tag doesn't change back to unresolved class unless at a safepoint.
239 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
240 // The original attempt to resolve this constant pool entry failed so find the
241 // class of the original error and throw another error of the same class
242 // (JVMS 5.4.3).
243 // If there is a detail message, pass that detail message to the error.
244 // The JVMS does not strictly require us to duplicate the same detail message,
245 // or any internal exception fields such as cause or stacktrace. But since the
246 // detail message is often a class name or other literal string, we will repeat it
247 // if we can find it in the symbol table.
248 throw_resolution_error(this_cp, which, CHECK_0);
249 ShouldNotReachHere();
250 }
251
252 Handle mirror_handle;
253 Symbol* name = entry.get_symbol();
254 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
255 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
256 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
257 KlassHandle k (THREAD, kk);
258 if (!HAS_PENDING_EXCEPTION) {
259 // preserve the resolved klass from unloading
260 mirror_handle = Handle(THREAD, kk->java_mirror());
261 // Do access check for klasses
262 verify_constant_pool_resolve(this_cp, k, THREAD);
263 }
264
265 // Failed to resolve class. We must record the errors so that subsequent attempts
266 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
267 if (HAS_PENDING_EXCEPTION) {
268 if (save_resolution_error) {
269 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
270 // If CHECK_NULL above doesn't return the exception, that means that
271 // some other thread has beaten us and has resolved the class.
272 // To preserve old behavior, we return the resolved class.
273 entry = this_cp->resolved_klass_at(which);
274 assert(entry.is_resolved(), "must be resolved if exception was cleared");
275 assert(entry.get_klass()->is_klass(), "must be resolved to a klass");
276 return entry.get_klass();
277 } else {
278 return NULL; // return the pending exception
279 }
280 }
281
282 // Make this class loader depend upon the class loader owning the class reference
283 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
284 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
285
286 // logging for class+resolve.
287 if (log_is_enabled(Debug, class, resolve)){
288 trace_class_resolution(this_cp, k);
289 }
290 this_cp->klass_at_put(which, k());
291 entry = this_cp->resolved_klass_at(which);
292 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
293 return entry.get_klass();
294 }
295
296
297 // Does not update ConstantPool* - to avoid any exception throwing. Used
298 // by compiler and exception handling. Also used to avoid classloads for
299 // instanceof operations. Returns NULL if the class has not been loaded or
300 // if the verification of constant pool failed
301 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
302 CPSlot entry = this_cp->slot_at(which);
303 if (entry.is_resolved()) {
304 assert(entry.get_klass()->is_klass(), "must be");
305 return entry.get_klass();
306 } else {
307 assert(entry.is_unresolved(), "must be either symbol or klass");
308 Thread *thread = Thread::current();
309 Symbol* name = entry.get_symbol();
310 oop loader = this_cp->pool_holder()->class_loader();
311 oop protection_domain = this_cp->pool_holder()->protection_domain();
312 Handle h_prot (thread, protection_domain);
313 Handle h_loader (thread, loader);
314 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
315
316 if (k != NULL) {
317 // Make sure that resolving is legal
318 EXCEPTION_MARK;
319 KlassHandle klass(THREAD, k);
320 // return NULL if verification fails
321 verify_constant_pool_resolve(this_cp, klass, THREAD);
322 if (HAS_PENDING_EXCEPTION) {
323 CLEAR_PENDING_EXCEPTION;
324 return NULL;
325 }
326 return klass();
327 } else {
328 return k;
329 }
330 }
331 }
332
333
334 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) {
335 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which));
336 }
337
338
339 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
340 int which) {
341 if (cpool->cache() == NULL) return NULL; // nothing to load yet
342 int cache_index = decode_cpcache_index(which, true);
343 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
344 // FIXME: should be an assert
345 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
346 return NULL;
347 }
348 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
349 return e->method_if_resolved(cpool);
350 }
351
352
353 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
354 if (cpool->cache() == NULL) return false; // nothing to load yet
355 int cache_index = decode_cpcache_index(which, true);
356 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
357 return e->has_appendix();
358 }
359
360 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
361 if (cpool->cache() == NULL) return NULL; // nothing to load yet
362 int cache_index = decode_cpcache_index(which, true);
363 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
364 return e->appendix_if_resolved(cpool);
365 }
366
367
368 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
369 if (cpool->cache() == NULL) return false; // nothing to load yet
370 int cache_index = decode_cpcache_index(which, true);
371 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
372 return e->has_method_type();
373 }
374
375 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
376 if (cpool->cache() == NULL) return NULL; // nothing to load yet
377 int cache_index = decode_cpcache_index(which, true);
378 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
379 return e->method_type_if_resolved(cpool);
380 }
381
382
383 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
384 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
385 return symbol_at(name_index);
386 }
387
388
389 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
390 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
391 return symbol_at(signature_index);
392 }
393
394
395 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
396 int i = which;
397 if (!uncached && cache() != NULL) {
398 if (ConstantPool::is_invokedynamic_index(which)) {
399 // Invokedynamic index is index into the constant pool cache
400 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
401 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
402 assert(tag_at(pool_index).is_name_and_type(), "");
403 return pool_index;
404 }
405 // change byte-ordering and go via cache
406 i = remap_instruction_operand_from_cache(which);
407 } else {
408 if (tag_at(which).is_invoke_dynamic()) {
409 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
410 assert(tag_at(pool_index).is_name_and_type(), "");
411 return pool_index;
412 }
413 }
414 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
415 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
416 jint ref_index = *int_at_addr(i);
417 return extract_high_short_from_int(ref_index);
418 }
419
420 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
421 int pool_index = which;
422 if (!uncached && cache() != NULL) {
423 if (ConstantPool::is_invokedynamic_index(which)) {
424 // Invokedynamic index is index into resolved_references
425 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
426 } else {
427 // change byte-ordering and go via cache
428 pool_index = remap_instruction_operand_from_cache(which);
429 }
430 }
431 return tag_at(pool_index);
432 }
433
434 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
435 guarantee(!ConstantPool::is_invokedynamic_index(which),
436 "an invokedynamic instruction does not have a klass");
437 int i = which;
438 if (!uncached && cache() != NULL) {
439 // change byte-ordering and go via cache
440 i = remap_instruction_operand_from_cache(which);
441 }
442 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
443 jint ref_index = *int_at_addr(i);
444 return extract_low_short_from_int(ref_index);
445 }
446
447
448
449 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
450 int cpc_index = operand;
451 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
452 assert((int)(u2)cpc_index == cpc_index, "clean u2");
453 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
454 return member_index;
455 }
456
457
458 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, KlassHandle k, TRAPS) {
459 if (k->is_instance_klass() || k->is_objArray_klass()) {
460 instanceKlassHandle holder (THREAD, this_cp->pool_holder());
461 Klass* elem = k->is_instance_klass() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
462 KlassHandle element (THREAD, elem);
463
464 // The element type could be a typeArray - we only need the access check if it is
465 // an reference to another class
466 if (element->is_instance_klass()) {
467 LinkResolver::check_klass_accessability(holder, element, CHECK);
468 }
469 }
470 }
471
472
473 int ConstantPool::name_ref_index_at(int which_nt) {
474 jint ref_index = name_and_type_at(which_nt);
475 return extract_low_short_from_int(ref_index);
476 }
477
478
479 int ConstantPool::signature_ref_index_at(int which_nt) {
480 jint ref_index = name_and_type_at(which_nt);
481 return extract_high_short_from_int(ref_index);
482 }
483
484
485 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
486 return klass_at(klass_ref_index_at(which), THREAD);
487 }
488
489
490 Symbol* ConstantPool::klass_name_at(int which) const {
491 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
492 "Corrupted constant pool");
493 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
494 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
495 // tag is not updated atomicly.
496 CPSlot entry = slot_at(which);
497 if (entry.is_resolved()) {
498 // Already resolved - return entry's name.
499 assert(entry.get_klass()->is_klass(), "must be");
500 return entry.get_klass()->name();
501 } else {
502 assert(entry.is_unresolved(), "must be either symbol or klass");
503 return entry.get_symbol();
504 }
505 }
506
507 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
508 jint ref_index = klass_ref_index_at(which);
509 return klass_at_noresolve(ref_index);
510 }
511
512 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
513 jint ref_index = uncached_klass_ref_index_at(which);
514 return klass_at_noresolve(ref_index);
515 }
516
517 char* ConstantPool::string_at_noresolve(int which) {
518 return unresolved_string_at(which)->as_C_string();
519 }
520
521 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
522 return FieldType::basic_type(symbol_at(which));
523 }
524
525
526 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
527 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
528 if (this_cp->tag_at(index).is_string()) {
529 this_cp->string_at(index, CHECK);
530 }
531 }
532 }
533
534 // Resolve all the classes in the constant pool. If they are all resolved,
535 // the constant pool is read-only. Enhancement: allocate cp entries to
536 // another metaspace, and copy to read-only or read-write space if this
537 // bit is set.
538 bool ConstantPool::resolve_class_constants(TRAPS) {
539 constantPoolHandle cp(THREAD, this);
540 for (int index = 1; index < length(); index++) { // Index 0 is unused
541 if (tag_at(index).is_unresolved_klass() &&
542 klass_at_if_loaded(cp, index) == NULL) {
543 return false;
544 }
545 }
546 // set_preresolution(); or some bit for future use
547 return true;
548 }
549
550 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
551 // Dig out the detailed message to reuse if possible
552 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
553 if (message != NULL) {
554 return message;
555 }
556
557 // Return specific message for the tag
558 switch (tag.value()) {
559 case JVM_CONSTANT_UnresolvedClass:
560 // return the class name in the error message
561 message = this_cp->klass_name_at(which);
562 break;
563 case JVM_CONSTANT_MethodHandle:
564 // return the method handle name in the error message
565 message = this_cp->method_handle_name_ref_at(which);
566 break;
567 case JVM_CONSTANT_MethodType:
568 // return the method type signature in the error message
569 message = this_cp->method_type_signature_at(which);
570 break;
571 default:
572 ShouldNotReachHere();
573 }
574
575 return message;
576 }
577
578 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
579 Symbol* message = NULL;
580 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
581 assert(error != NULL && message != NULL, "checking");
582 CLEAR_PENDING_EXCEPTION;
583 ResourceMark rm;
584 THROW_MSG(error, message->as_C_string());
585 }
586
587 // If resolution for Class, MethodHandle or MethodType fails, save the exception
588 // in the resolution error table, so that the same exception is thrown again.
589 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
590 constantTag tag, TRAPS) {
591 Symbol* error = PENDING_EXCEPTION->klass()->name();
592
593 int error_tag = tag.error_value();
594
595 if (!PENDING_EXCEPTION->
596 is_a(SystemDictionary::LinkageError_klass())) {
597 // Just throw the exception and don't prevent these classes from
598 // being loaded due to virtual machine errors like StackOverflow
599 // and OutOfMemoryError, etc, or if the thread was hit by stop()
600 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
601 } else if (this_cp->tag_at(which).value() != error_tag) {
602 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
603 SystemDictionary::add_resolution_error(this_cp, which, error, message);
604 // CAS in the tag. If a thread beat us to registering this error that's fine.
605 // If another thread resolved the reference, this is a race condition. This
606 // thread may have had a security manager or something temporary.
607 // This doesn't deterministically get an error. So why do we save this?
608 // We save this because jvmti can add classes to the bootclass path after
609 // this error, so it needs to get the same error if the error is first.
610 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
611 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
612 if (old_tag != error_tag && old_tag != tag.value()) {
613 // MethodHandles and MethodType doesn't change to resolved version.
614 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
615 // Forget the exception and use the resolved class.
616 CLEAR_PENDING_EXCEPTION;
617 }
618 } else {
619 // some other thread put this in error state
620 throw_resolution_error(this_cp, which, CHECK);
621 }
622 }
623
624 // Called to resolve constants in the constant pool and return an oop.
625 // Some constant pool entries cache their resolved oop. This is also
626 // called to create oops from constants to use in arguments for invokedynamic
627 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) {
628 oop result_oop = NULL;
629 Handle throw_exception;
630
631 if (cache_index == _possible_index_sentinel) {
632 // It is possible that this constant is one which is cached in the objects.
633 // We'll do a linear search. This should be OK because this usage is rare.
634 assert(index > 0, "valid index");
635 cache_index = this_cp->cp_to_object_index(index);
636 }
637 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
638 assert(index == _no_index_sentinel || index >= 0, "");
639
640 if (cache_index >= 0) {
641 result_oop = this_cp->resolved_references()->obj_at(cache_index);
642 if (result_oop != NULL) {
643 return result_oop;
644 // That was easy...
645 }
646 index = this_cp->object_to_cp_index(cache_index);
647 }
648
649 jvalue prim_value; // temp used only in a few cases below
650
651 constantTag tag = this_cp->tag_at(index);
652
653 switch (tag.value()) {
654
655 case JVM_CONSTANT_UnresolvedClass:
656 case JVM_CONSTANT_UnresolvedClassInError:
657 case JVM_CONSTANT_Class:
658 {
659 assert(cache_index == _no_index_sentinel, "should not have been set");
660 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
661 // ldc wants the java mirror.
662 result_oop = resolved->java_mirror();
663 break;
664 }
665
666 case JVM_CONSTANT_String:
667 assert(cache_index != _no_index_sentinel, "should have been set");
668 if (this_cp->is_pseudo_string_at(index)) {
669 result_oop = this_cp->pseudo_string_at(index, cache_index);
670 break;
671 }
672 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
673 break;
674
675 case JVM_CONSTANT_MethodHandleInError:
676 case JVM_CONSTANT_MethodTypeInError:
677 {
678 throw_resolution_error(this_cp, index, CHECK_NULL);
679 break;
680 }
681
682 case JVM_CONSTANT_MethodHandle:
683 {
684 int ref_kind = this_cp->method_handle_ref_kind_at(index);
685 int callee_index = this_cp->method_handle_klass_index_at(index);
686 Symbol* name = this_cp->method_handle_name_ref_at(index);
687 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
688 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
689 { ResourceMark rm(THREAD);
690 log_debug(class, resolve)("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 }
694
695 Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
696 KlassHandle callee(THREAD, k);
697
698 // Check constant pool method consistency
699 if ((callee->is_interface() && m_tag.is_method()) ||
700 ((!callee->is_interface() && m_tag.is_interface_method()))) {
701 ResourceMark rm(THREAD);
702 char buf[400];
703 jio_snprintf(buf, sizeof(buf),
704 "Inconsistent constant pool data in classfile for class %s. "
705 "Method %s%s at index %d is %s and should be %s",
706 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index,
707 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
708 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
709 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
710 }
711
712 KlassHandle klass(THREAD, this_cp->pool_holder());
713 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
714 callee, name, signature,
715 THREAD);
716 result_oop = value();
717 if (HAS_PENDING_EXCEPTION) {
718 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
719 }
720 break;
721 }
722
723 case JVM_CONSTANT_MethodType:
724 {
725 Symbol* signature = this_cp->method_type_signature_at(index);
726 { ResourceMark rm(THREAD);
727 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
728 index, this_cp->method_type_index_at(index),
729 signature->as_C_string());
730 }
731 KlassHandle klass(THREAD, this_cp->pool_holder());
732 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
733 result_oop = value();
734 if (HAS_PENDING_EXCEPTION) {
735 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
736 }
737 break;
738 }
739
740 case JVM_CONSTANT_Integer:
741 assert(cache_index == _no_index_sentinel, "should not have been set");
742 prim_value.i = this_cp->int_at(index);
743 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
744 break;
745
746 case JVM_CONSTANT_Float:
747 assert(cache_index == _no_index_sentinel, "should not have been set");
748 prim_value.f = this_cp->float_at(index);
749 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
750 break;
751
752 case JVM_CONSTANT_Long:
753 assert(cache_index == _no_index_sentinel, "should not have been set");
754 prim_value.j = this_cp->long_at(index);
755 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
756 break;
757
758 case JVM_CONSTANT_Double:
759 assert(cache_index == _no_index_sentinel, "should not have been set");
760 prim_value.d = this_cp->double_at(index);
761 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
762 break;
763
764 default:
765 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
766 this_cp(), index, cache_index, tag.value()));
767 assert(false, "unexpected constant tag");
768 break;
769 }
770
771 if (cache_index >= 0) {
772 // Benign race condition: resolved_references may already be filled in.
773 // The important thing here is that all threads pick up the same result.
774 // It doesn't matter which racing thread wins, as long as only one
775 // result is used by all threads, and all future queries.
776 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL);
777 if (old_result == NULL) {
778 return result_oop; // was installed
779 } else {
780 // Return the winning thread's result. This can be different than
781 // the result here for MethodHandles.
782 return old_result;
783 }
784 } else {
785 return result_oop;
786 }
787 }
788
789 oop ConstantPool::uncached_string_at(int which, TRAPS) {
790 Symbol* sym = unresolved_string_at(which);
791 oop str = StringTable::intern(sym, CHECK_(NULL));
792 assert(java_lang_String::is_instance(str), "must be string");
793 return str;
794 }
795
796
797 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) {
798 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
799
800 Handle bsm;
801 int argc;
802 {
803 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
804 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
805 // It is accompanied by the optional arguments.
806 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
807 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
808 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
809 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
810 }
811
812 // Extract the optional static arguments.
813 argc = this_cp->invoke_dynamic_argument_count_at(index);
814 if (argc == 0) return bsm_oop;
815
816 bsm = Handle(THREAD, bsm_oop);
817 }
818
819 objArrayHandle info;
820 {
821 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
822 info = objArrayHandle(THREAD, info_oop);
823 }
824
825 info->obj_at_put(0, bsm());
826 for (int i = 0; i < argc; i++) {
827 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
828 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
829 info->obj_at_put(1+i, arg_oop);
830 }
831
832 return info();
833 }
834
835 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
836 // If the string has already been interned, this entry will be non-null
837 oop str = this_cp->resolved_references()->obj_at(obj_index);
838 if (str != NULL) return str;
839 Symbol* sym = this_cp->unresolved_string_at(which);
840 str = StringTable::intern(sym, CHECK_(NULL));
841 this_cp->string_at_put(which, obj_index, str);
842 assert(java_lang_String::is_instance(str), "must be string");
843 return str;
844 }
845
846
847 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
848 int which) {
849 // Names are interned, so we can compare Symbol*s directly
850 Symbol* cp_name = klass_name_at(which);
851 return (cp_name == k->name());
852 }
853
854
855 // Iterate over symbols and decrement ones which are Symbol*s
856 // This is done during GC.
857 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
858 // these symbols but didn't increment the reference count.
859 void ConstantPool::unreference_symbols() {
860 for (int index = 1; index < length(); index++) { // Index 0 is unused
861 constantTag tag = tag_at(index);
862 if (tag.is_symbol()) {
863 symbol_at(index)->decrement_refcount();
864 }
865 }
866 }
867
868
869 // Compare this constant pool's entry at index1 to the constant pool
870 // cp2's entry at index2.
871 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
872 int index2, TRAPS) {
873
874 // The error tags are equivalent to non-error tags when comparing
875 jbyte t1 = tag_at(index1).non_error_value();
876 jbyte t2 = cp2->tag_at(index2).non_error_value();
877
878 if (t1 != t2) {
879 // Not the same entry type so there is nothing else to check. Note
880 // that this style of checking will consider resolved/unresolved
881 // class pairs as different.
882 // From the ConstantPool* API point of view, this is correct
883 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
884 // plays out in the context of ConstantPool* merging.
885 return false;
886 }
887
888 switch (t1) {
889 case JVM_CONSTANT_Class:
890 {
891 Klass* k1 = klass_at(index1, CHECK_false);
892 Klass* k2 = cp2->klass_at(index2, CHECK_false);
893 if (k1 == k2) {
894 return true;
895 }
896 } break;
897
898 case JVM_CONSTANT_ClassIndex:
899 {
900 int recur1 = klass_index_at(index1);
901 int recur2 = cp2->klass_index_at(index2);
902 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
903 if (match) {
904 return true;
905 }
906 } break;
907
908 case JVM_CONSTANT_Double:
909 {
910 jdouble d1 = double_at(index1);
911 jdouble d2 = cp2->double_at(index2);
912 if (d1 == d2) {
913 return true;
914 }
915 } break;
916
917 case JVM_CONSTANT_Fieldref:
918 case JVM_CONSTANT_InterfaceMethodref:
919 case JVM_CONSTANT_Methodref:
920 {
921 int recur1 = uncached_klass_ref_index_at(index1);
922 int recur2 = cp2->uncached_klass_ref_index_at(index2);
923 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
924 if (match) {
925 recur1 = uncached_name_and_type_ref_index_at(index1);
926 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
927 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
928 if (match) {
929 return true;
930 }
931 }
932 } break;
933
934 case JVM_CONSTANT_Float:
935 {
936 jfloat f1 = float_at(index1);
937 jfloat f2 = cp2->float_at(index2);
938 if (f1 == f2) {
939 return true;
940 }
941 } break;
942
943 case JVM_CONSTANT_Integer:
944 {
945 jint i1 = int_at(index1);
946 jint i2 = cp2->int_at(index2);
947 if (i1 == i2) {
948 return true;
949 }
950 } break;
951
952 case JVM_CONSTANT_Long:
953 {
954 jlong l1 = long_at(index1);
955 jlong l2 = cp2->long_at(index2);
956 if (l1 == l2) {
957 return true;
958 }
959 } break;
960
961 case JVM_CONSTANT_NameAndType:
962 {
963 int recur1 = name_ref_index_at(index1);
964 int recur2 = cp2->name_ref_index_at(index2);
965 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
966 if (match) {
967 recur1 = signature_ref_index_at(index1);
968 recur2 = cp2->signature_ref_index_at(index2);
969 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
970 if (match) {
971 return true;
972 }
973 }
974 } break;
975
976 case JVM_CONSTANT_StringIndex:
977 {
978 int recur1 = string_index_at(index1);
979 int recur2 = cp2->string_index_at(index2);
980 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
981 if (match) {
982 return true;
983 }
984 } break;
985
986 case JVM_CONSTANT_UnresolvedClass:
987 {
988 Symbol* k1 = klass_name_at(index1);
989 Symbol* k2 = cp2->klass_name_at(index2);
990 if (k1 == k2) {
991 return true;
992 }
993 } break;
994
995 case JVM_CONSTANT_MethodType:
996 {
997 int k1 = method_type_index_at(index1);
998 int k2 = cp2->method_type_index_at(index2);
999 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1000 if (match) {
1001 return true;
1002 }
1003 } break;
1004
1005 case JVM_CONSTANT_MethodHandle:
1006 {
1007 int k1 = method_handle_ref_kind_at(index1);
1008 int k2 = cp2->method_handle_ref_kind_at(index2);
1009 if (k1 == k2) {
1010 int i1 = method_handle_index_at(index1);
1011 int i2 = cp2->method_handle_index_at(index2);
1012 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1013 if (match) {
1014 return true;
1015 }
1016 }
1017 } break;
1018
1019 case JVM_CONSTANT_InvokeDynamic:
1020 {
1021 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1022 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1023 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1024 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1025 // separate statements and variables because CHECK_false is used
1026 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1027 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1028 return (match_entry && match_operand);
1029 } break;
1030
1031 case JVM_CONSTANT_String:
1032 {
1033 Symbol* s1 = unresolved_string_at(index1);
1034 Symbol* s2 = cp2->unresolved_string_at(index2);
1035 if (s1 == s2) {
1036 return true;
1037 }
1038 } break;
1039
1040 case JVM_CONSTANT_Utf8:
1041 {
1042 Symbol* s1 = symbol_at(index1);
1043 Symbol* s2 = cp2->symbol_at(index2);
1044 if (s1 == s2) {
1045 return true;
1046 }
1047 } break;
1048
1049 // Invalid is used as the tag for the second constant pool entry
1050 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1051 // not be seen by itself.
1052 case JVM_CONSTANT_Invalid: // fall through
1053
1054 default:
1055 ShouldNotReachHere();
1056 break;
1057 }
1058
1059 return false;
1060 } // end compare_entry_to()
1061
1062
1063 // Resize the operands array with delta_len and delta_size.
1064 // Used in RedefineClasses for CP merge.
1065 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1066 int old_len = operand_array_length(operands());
1067 int new_len = old_len + delta_len;
1068 int min_len = (delta_len > 0) ? old_len : new_len;
1069
1070 int old_size = operands()->length();
1071 int new_size = old_size + delta_size;
1072 int min_size = (delta_size > 0) ? old_size : new_size;
1073
1074 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1075 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1076
1077 // Set index in the resized array for existing elements only
1078 for (int idx = 0; idx < min_len; idx++) {
1079 int offset = operand_offset_at(idx); // offset in original array
1080 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1081 }
1082 // Copy the bootstrap specifiers only
1083 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1084 new_ops->adr_at(2*new_len),
1085 (min_size - 2*min_len) * sizeof(u2));
1086 // Explicitly deallocate old operands array.
1087 // Note, it is not needed for 7u backport.
1088 if ( operands() != NULL) { // the safety check
1089 MetadataFactory::free_array<u2>(loader_data, operands());
1090 }
1091 set_operands(new_ops);
1092 } // end resize_operands()
1093
1094
1095 // Extend the operands array with the length and size of the ext_cp operands.
1096 // Used in RedefineClasses for CP merge.
1097 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1098 int delta_len = operand_array_length(ext_cp->operands());
1099 if (delta_len == 0) {
1100 return; // nothing to do
1101 }
1102 int delta_size = ext_cp->operands()->length();
1103
1104 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1105
1106 if (operand_array_length(operands()) == 0) {
1107 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1108 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1109 // The first element index defines the offset of second part
1110 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1111 set_operands(new_ops);
1112 } else {
1113 resize_operands(delta_len, delta_size, CHECK);
1114 }
1115
1116 } // end extend_operands()
1117
1118
1119 // Shrink the operands array to a smaller array with new_len length.
1120 // Used in RedefineClasses for CP merge.
1121 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1122 int old_len = operand_array_length(operands());
1123 if (new_len == old_len) {
1124 return; // nothing to do
1125 }
1126 assert(new_len < old_len, "shrunken operands array must be smaller");
1127
1128 int free_base = operand_next_offset_at(new_len - 1);
1129 int delta_len = new_len - old_len;
1130 int delta_size = 2*delta_len + free_base - operands()->length();
1131
1132 resize_operands(delta_len, delta_size, CHECK);
1133
1134 } // end shrink_operands()
1135
1136
1137 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1138 const constantPoolHandle& to_cp,
1139 TRAPS) {
1140
1141 int from_oplen = operand_array_length(from_cp->operands());
1142 int old_oplen = operand_array_length(to_cp->operands());
1143 if (from_oplen != 0) {
1144 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1145 // append my operands to the target's operands array
1146 if (old_oplen == 0) {
1147 // Can't just reuse from_cp's operand list because of deallocation issues
1148 int len = from_cp->operands()->length();
1149 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1150 Copy::conjoint_memory_atomic(
1151 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1152 to_cp->set_operands(new_ops);
1153 } else {
1154 int old_len = to_cp->operands()->length();
1155 int from_len = from_cp->operands()->length();
1156 int old_off = old_oplen * sizeof(u2);
1157 int from_off = from_oplen * sizeof(u2);
1158 // Use the metaspace for the destination constant pool
1159 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1160 int fillp = 0, len = 0;
1161 // first part of dest
1162 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1163 new_operands->adr_at(fillp),
1164 (len = old_off) * sizeof(u2));
1165 fillp += len;
1166 // first part of src
1167 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1168 new_operands->adr_at(fillp),
1169 (len = from_off) * sizeof(u2));
1170 fillp += len;
1171 // second part of dest
1172 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1173 new_operands->adr_at(fillp),
1174 (len = old_len - old_off) * sizeof(u2));
1175 fillp += len;
1176 // second part of src
1177 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1178 new_operands->adr_at(fillp),
1179 (len = from_len - from_off) * sizeof(u2));
1180 fillp += len;
1181 assert(fillp == new_operands->length(), "");
1182
1183 // Adjust indexes in the first part of the copied operands array.
1184 for (int j = 0; j < from_oplen; j++) {
1185 int offset = operand_offset_at(new_operands, old_oplen + j);
1186 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1187 offset += old_len; // every new tuple is preceded by old_len extra u2's
1188 operand_offset_at_put(new_operands, old_oplen + j, offset);
1189 }
1190
1191 // replace target operands array with combined array
1192 to_cp->set_operands(new_operands);
1193 }
1194 }
1195 } // end copy_operands()
1196
1197
1198 // Copy this constant pool's entries at start_i to end_i (inclusive)
1199 // to the constant pool to_cp's entries starting at to_i. A total of
1200 // (end_i - start_i) + 1 entries are copied.
1201 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1202 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1203
1204
1205 int dest_i = to_i; // leave original alone for debug purposes
1206
1207 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1208 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1209
1210 switch (from_cp->tag_at(src_i).value()) {
1211 case JVM_CONSTANT_Double:
1212 case JVM_CONSTANT_Long:
1213 // double and long take two constant pool entries
1214 src_i += 2;
1215 dest_i += 2;
1216 break;
1217
1218 default:
1219 // all others take one constant pool entry
1220 src_i++;
1221 dest_i++;
1222 break;
1223 }
1224 }
1225 copy_operands(from_cp, to_cp, CHECK);
1226
1227 } // end copy_cp_to_impl()
1228
1229
1230 // Copy this constant pool's entry at from_i to the constant pool
1231 // to_cp's entry at to_i.
1232 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1233 const constantPoolHandle& to_cp, int to_i,
1234 TRAPS) {
1235
1236 int tag = from_cp->tag_at(from_i).value();
1237 switch (tag) {
1238 case JVM_CONSTANT_Class:
1239 {
1240 Klass* k = from_cp->klass_at(from_i, CHECK);
1241 to_cp->klass_at_put(to_i, k);
1242 } break;
1243
1244 case JVM_CONSTANT_ClassIndex:
1245 {
1246 jint ki = from_cp->klass_index_at(from_i);
1247 to_cp->klass_index_at_put(to_i, ki);
1248 } break;
1249
1250 case JVM_CONSTANT_Double:
1251 {
1252 jdouble d = from_cp->double_at(from_i);
1253 to_cp->double_at_put(to_i, d);
1254 // double takes two constant pool entries so init second entry's tag
1255 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1256 } break;
1257
1258 case JVM_CONSTANT_Fieldref:
1259 {
1260 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1261 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1262 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1263 } break;
1264
1265 case JVM_CONSTANT_Float:
1266 {
1267 jfloat f = from_cp->float_at(from_i);
1268 to_cp->float_at_put(to_i, f);
1269 } break;
1270
1271 case JVM_CONSTANT_Integer:
1272 {
1273 jint i = from_cp->int_at(from_i);
1274 to_cp->int_at_put(to_i, i);
1275 } break;
1276
1277 case JVM_CONSTANT_InterfaceMethodref:
1278 {
1279 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1280 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1281 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1282 } break;
1283
1284 case JVM_CONSTANT_Long:
1285 {
1286 jlong l = from_cp->long_at(from_i);
1287 to_cp->long_at_put(to_i, l);
1288 // long takes two constant pool entries so init second entry's tag
1289 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1290 } break;
1291
1292 case JVM_CONSTANT_Methodref:
1293 {
1294 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1295 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1296 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1297 } break;
1298
1299 case JVM_CONSTANT_NameAndType:
1300 {
1301 int name_ref_index = from_cp->name_ref_index_at(from_i);
1302 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1303 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1304 } break;
1305
1306 case JVM_CONSTANT_StringIndex:
1307 {
1308 jint si = from_cp->string_index_at(from_i);
1309 to_cp->string_index_at_put(to_i, si);
1310 } break;
1311
1312 case JVM_CONSTANT_UnresolvedClass:
1313 case JVM_CONSTANT_UnresolvedClassInError:
1314 {
1315 // Can be resolved after checking tag, so check the slot first.
1316 CPSlot entry = from_cp->slot_at(from_i);
1317 if (entry.is_resolved()) {
1318 assert(entry.get_klass()->is_klass(), "must be");
1319 // Already resolved
1320 to_cp->klass_at_put(to_i, entry.get_klass());
1321 } else {
1322 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1323 }
1324 } break;
1325
1326 case JVM_CONSTANT_String:
1327 {
1328 Symbol* s = from_cp->unresolved_string_at(from_i);
1329 to_cp->unresolved_string_at_put(to_i, s);
1330 } break;
1331
1332 case JVM_CONSTANT_Utf8:
1333 {
1334 Symbol* s = from_cp->symbol_at(from_i);
1335 // Need to increase refcount, the old one will be thrown away and deferenced
1336 s->increment_refcount();
1337 to_cp->symbol_at_put(to_i, s);
1338 } break;
1339
1340 case JVM_CONSTANT_MethodType:
1341 case JVM_CONSTANT_MethodTypeInError:
1342 {
1343 jint k = from_cp->method_type_index_at(from_i);
1344 to_cp->method_type_index_at_put(to_i, k);
1345 } break;
1346
1347 case JVM_CONSTANT_MethodHandle:
1348 case JVM_CONSTANT_MethodHandleInError:
1349 {
1350 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1351 int k2 = from_cp->method_handle_index_at(from_i);
1352 to_cp->method_handle_index_at_put(to_i, k1, k2);
1353 } break;
1354
1355 case JVM_CONSTANT_InvokeDynamic:
1356 {
1357 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1358 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1359 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1360 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1361 } break;
1362
1363 // Invalid is used as the tag for the second constant pool entry
1364 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1365 // not be seen by itself.
1366 case JVM_CONSTANT_Invalid: // fall through
1367
1368 default:
1369 {
1370 ShouldNotReachHere();
1371 } break;
1372 }
1373 } // end copy_entry_to()
1374
1375
1376 // Search constant pool search_cp for an entry that matches this
1377 // constant pool's entry at pattern_i. Returns the index of a
1378 // matching entry or zero (0) if there is no matching entry.
1379 int ConstantPool::find_matching_entry(int pattern_i,
1380 const constantPoolHandle& search_cp, TRAPS) {
1381
1382 // index zero (0) is not used
1383 for (int i = 1; i < search_cp->length(); i++) {
1384 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1385 if (found) {
1386 return i;
1387 }
1388 }
1389
1390 return 0; // entry not found; return unused index zero (0)
1391 } // end find_matching_entry()
1392
1393
1394 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1395 // cp2's bootstrap specifier at idx2.
1396 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1397 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1398 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1399 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1400
1401 if (!match) {
1402 return false;
1403 }
1404 int argc = operand_argument_count_at(idx1);
1405 if (argc == cp2->operand_argument_count_at(idx2)) {
1406 for (int j = 0; j < argc; j++) {
1407 k1 = operand_argument_index_at(idx1, j);
1408 k2 = cp2->operand_argument_index_at(idx2, j);
1409 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1410 if (!match) {
1411 return false;
1412 }
1413 }
1414 return true; // got through loop; all elements equal
1415 }
1416 return false;
1417 } // end compare_operand_to()
1418
1419 // Search constant pool search_cp for a bootstrap specifier that matches
1420 // this constant pool's bootstrap specifier at pattern_i index.
1421 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1422 int ConstantPool::find_matching_operand(int pattern_i,
1423 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1424 for (int i = 0; i < search_len; i++) {
1425 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1426 if (found) {
1427 return i;
1428 }
1429 }
1430 return -1; // bootstrap specifier not found; return unused index (-1)
1431 } // end find_matching_operand()
1432
1433
1434 #ifndef PRODUCT
1435
1436 const char* ConstantPool::printable_name_at(int which) {
1437
1438 constantTag tag = tag_at(which);
1439
1440 if (tag.is_string()) {
1441 return string_at_noresolve(which);
1442 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1443 return klass_name_at(which)->as_C_string();
1444 } else if (tag.is_symbol()) {
1445 return symbol_at(which)->as_C_string();
1446 }
1447 return "";
1448 }
1449
1450 #endif // PRODUCT
1451
1452
1453 // JVMTI GetConstantPool support
1454
1455 // For debugging of constant pool
1456 const bool debug_cpool = false;
1457
1458 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1459
1460 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1461 const char* WARN_MSG = "Must not be such entry!";
1462 jint size = 0;
1463 u2 idx1, idx2;
1464
1465 for (jint idx = 1; idx < cnt; idx++) {
1466 jint ent_size = 0;
1467 u1 tag = *bytes++;
1468 size++; // count tag
1469
1470 printf("const #%03d, tag: %02d ", idx, tag);
1471 switch(tag) {
1472 case JVM_CONSTANT_Invalid: {
1473 printf("Invalid");
1474 break;
1475 }
1476 case JVM_CONSTANT_Unicode: {
1477 printf("Unicode %s", WARN_MSG);
1478 break;
1479 }
1480 case JVM_CONSTANT_Utf8: {
1481 u2 len = Bytes::get_Java_u2(bytes);
1482 char str[128];
1483 if (len > 127) {
1484 len = 127;
1485 }
1486 strncpy(str, (char *) (bytes+2), len);
1487 str[len] = '\0';
1488 printf("Utf8 \"%s\"", str);
1489 ent_size = 2 + len;
1490 break;
1491 }
1492 case JVM_CONSTANT_Integer: {
1493 u4 val = Bytes::get_Java_u4(bytes);
1494 printf("int %d", *(int *) &val);
1495 ent_size = 4;
1496 break;
1497 }
1498 case JVM_CONSTANT_Float: {
1499 u4 val = Bytes::get_Java_u4(bytes);
1500 printf("float %5.3ff", *(float *) &val);
1501 ent_size = 4;
1502 break;
1503 }
1504 case JVM_CONSTANT_Long: {
1505 u8 val = Bytes::get_Java_u8(bytes);
1506 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1507 ent_size = 8;
1508 idx++; // Long takes two cpool slots
1509 break;
1510 }
1511 case JVM_CONSTANT_Double: {
1512 u8 val = Bytes::get_Java_u8(bytes);
1513 printf("double %5.3fd", *(jdouble *)&val);
1514 ent_size = 8;
1515 idx++; // Double takes two cpool slots
1516 break;
1517 }
1518 case JVM_CONSTANT_Class: {
1519 idx1 = Bytes::get_Java_u2(bytes);
1520 printf("class #%03d", idx1);
1521 ent_size = 2;
1522 break;
1523 }
1524 case JVM_CONSTANT_String: {
1525 idx1 = Bytes::get_Java_u2(bytes);
1526 printf("String #%03d", idx1);
1527 ent_size = 2;
1528 break;
1529 }
1530 case JVM_CONSTANT_Fieldref: {
1531 idx1 = Bytes::get_Java_u2(bytes);
1532 idx2 = Bytes::get_Java_u2(bytes+2);
1533 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1534 ent_size = 4;
1535 break;
1536 }
1537 case JVM_CONSTANT_Methodref: {
1538 idx1 = Bytes::get_Java_u2(bytes);
1539 idx2 = Bytes::get_Java_u2(bytes+2);
1540 printf("Method #%03d, #%03d", idx1, idx2);
1541 ent_size = 4;
1542 break;
1543 }
1544 case JVM_CONSTANT_InterfaceMethodref: {
1545 idx1 = Bytes::get_Java_u2(bytes);
1546 idx2 = Bytes::get_Java_u2(bytes+2);
1547 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1548 ent_size = 4;
1549 break;
1550 }
1551 case JVM_CONSTANT_NameAndType: {
1552 idx1 = Bytes::get_Java_u2(bytes);
1553 idx2 = Bytes::get_Java_u2(bytes+2);
1554 printf("NameAndType #%03d, #%03d", idx1, idx2);
1555 ent_size = 4;
1556 break;
1557 }
1558 case JVM_CONSTANT_ClassIndex: {
1559 printf("ClassIndex %s", WARN_MSG);
1560 break;
1561 }
1562 case JVM_CONSTANT_UnresolvedClass: {
1563 printf("UnresolvedClass: %s", WARN_MSG);
1564 break;
1565 }
1566 case JVM_CONSTANT_UnresolvedClassInError: {
1567 printf("UnresolvedClassInErr: %s", WARN_MSG);
1568 break;
1569 }
1570 case JVM_CONSTANT_StringIndex: {
1571 printf("StringIndex: %s", WARN_MSG);
1572 break;
1573 }
1574 }
1575 printf(";\n");
1576 bytes += ent_size;
1577 size += ent_size;
1578 }
1579 printf("Cpool size: %d\n", size);
1580 fflush(0);
1581 return;
1582 } /* end print_cpool_bytes */
1583
1584
1585 // Returns size of constant pool entry.
1586 jint ConstantPool::cpool_entry_size(jint idx) {
1587 switch(tag_at(idx).value()) {
1588 case JVM_CONSTANT_Invalid:
1589 case JVM_CONSTANT_Unicode:
1590 return 1;
1591
1592 case JVM_CONSTANT_Utf8:
1593 return 3 + symbol_at(idx)->utf8_length();
1594
1595 case JVM_CONSTANT_Class:
1596 case JVM_CONSTANT_String:
1597 case JVM_CONSTANT_ClassIndex:
1598 case JVM_CONSTANT_UnresolvedClass:
1599 case JVM_CONSTANT_UnresolvedClassInError:
1600 case JVM_CONSTANT_StringIndex:
1601 case JVM_CONSTANT_MethodType:
1602 case JVM_CONSTANT_MethodTypeInError:
1603 return 3;
1604
1605 case JVM_CONSTANT_MethodHandle:
1606 case JVM_CONSTANT_MethodHandleInError:
1607 return 4; //tag, ref_kind, ref_index
1608
1609 case JVM_CONSTANT_Integer:
1610 case JVM_CONSTANT_Float:
1611 case JVM_CONSTANT_Fieldref:
1612 case JVM_CONSTANT_Methodref:
1613 case JVM_CONSTANT_InterfaceMethodref:
1614 case JVM_CONSTANT_NameAndType:
1615 return 5;
1616
1617 case JVM_CONSTANT_InvokeDynamic:
1618 // u1 tag, u2 bsm, u2 nt
1619 return 5;
1620
1621 case JVM_CONSTANT_Long:
1622 case JVM_CONSTANT_Double:
1623 return 9;
1624 }
1625 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1626 return 1;
1627 } /* end cpool_entry_size */
1628
1629
1630 // SymbolHashMap is used to find a constant pool index from a string.
1631 // This function fills in SymbolHashMaps, one for utf8s and one for
1632 // class names, returns size of the cpool raw bytes.
1633 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1634 SymbolHashMap *classmap) {
1635 jint size = 0;
1636
1637 for (u2 idx = 1; idx < length(); idx++) {
1638 u2 tag = tag_at(idx).value();
1639 size += cpool_entry_size(idx);
1640
1641 switch(tag) {
1642 case JVM_CONSTANT_Utf8: {
1643 Symbol* sym = symbol_at(idx);
1644 symmap->add_entry(sym, idx);
1645 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1646 break;
1647 }
1648 case JVM_CONSTANT_Class:
1649 case JVM_CONSTANT_UnresolvedClass:
1650 case JVM_CONSTANT_UnresolvedClassInError: {
1651 Symbol* sym = klass_name_at(idx);
1652 classmap->add_entry(sym, idx);
1653 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1654 break;
1655 }
1656 case JVM_CONSTANT_Long:
1657 case JVM_CONSTANT_Double: {
1658 idx++; // Both Long and Double take two cpool slots
1659 break;
1660 }
1661 }
1662 }
1663 return size;
1664 } /* end hash_utf8_entries_to */
1665
1666
1667 // Copy cpool bytes.
1668 // Returns:
1669 // 0, in case of OutOfMemoryError
1670 // -1, in case of internal error
1671 // > 0, count of the raw cpool bytes that have been copied
1672 int ConstantPool::copy_cpool_bytes(int cpool_size,
1673 SymbolHashMap* tbl,
1674 unsigned char *bytes) {
1675 u2 idx1, idx2;
1676 jint size = 0;
1677 jint cnt = length();
1678 unsigned char *start_bytes = bytes;
1679
1680 for (jint idx = 1; idx < cnt; idx++) {
1681 u1 tag = tag_at(idx).value();
1682 jint ent_size = cpool_entry_size(idx);
1683
1684 assert(size + ent_size <= cpool_size, "Size mismatch");
1685
1686 *bytes = tag;
1687 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1688 switch(tag) {
1689 case JVM_CONSTANT_Invalid: {
1690 DBG(printf("JVM_CONSTANT_Invalid"));
1691 break;
1692 }
1693 case JVM_CONSTANT_Unicode: {
1694 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1695 DBG(printf("JVM_CONSTANT_Unicode"));
1696 break;
1697 }
1698 case JVM_CONSTANT_Utf8: {
1699 Symbol* sym = symbol_at(idx);
1700 char* str = sym->as_utf8();
1701 // Warning! It's crashing on x86 with len = sym->utf8_length()
1702 int len = (int) strlen(str);
1703 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1704 for (int i = 0; i < len; i++) {
1705 bytes[3+i] = (u1) str[i];
1706 }
1707 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1708 break;
1709 }
1710 case JVM_CONSTANT_Integer: {
1711 jint val = int_at(idx);
1712 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1713 break;
1714 }
1715 case JVM_CONSTANT_Float: {
1716 jfloat val = float_at(idx);
1717 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1718 break;
1719 }
1720 case JVM_CONSTANT_Long: {
1721 jlong val = long_at(idx);
1722 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1723 idx++; // Long takes two cpool slots
1724 break;
1725 }
1726 case JVM_CONSTANT_Double: {
1727 jdouble val = double_at(idx);
1728 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1729 idx++; // Double takes two cpool slots
1730 break;
1731 }
1732 case JVM_CONSTANT_Class:
1733 case JVM_CONSTANT_UnresolvedClass:
1734 case JVM_CONSTANT_UnresolvedClassInError: {
1735 *bytes = JVM_CONSTANT_Class;
1736 Symbol* sym = klass_name_at(idx);
1737 idx1 = tbl->symbol_to_value(sym);
1738 assert(idx1 != 0, "Have not found a hashtable entry");
1739 Bytes::put_Java_u2((address) (bytes+1), idx1);
1740 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1741 break;
1742 }
1743 case JVM_CONSTANT_String: {
1744 *bytes = JVM_CONSTANT_String;
1745 Symbol* sym = unresolved_string_at(idx);
1746 idx1 = tbl->symbol_to_value(sym);
1747 assert(idx1 != 0, "Have not found a hashtable entry");
1748 Bytes::put_Java_u2((address) (bytes+1), idx1);
1749 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1750 break;
1751 }
1752 case JVM_CONSTANT_Fieldref:
1753 case JVM_CONSTANT_Methodref:
1754 case JVM_CONSTANT_InterfaceMethodref: {
1755 idx1 = uncached_klass_ref_index_at(idx);
1756 idx2 = uncached_name_and_type_ref_index_at(idx);
1757 Bytes::put_Java_u2((address) (bytes+1), idx1);
1758 Bytes::put_Java_u2((address) (bytes+3), idx2);
1759 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1760 break;
1761 }
1762 case JVM_CONSTANT_NameAndType: {
1763 idx1 = name_ref_index_at(idx);
1764 idx2 = signature_ref_index_at(idx);
1765 Bytes::put_Java_u2((address) (bytes+1), idx1);
1766 Bytes::put_Java_u2((address) (bytes+3), idx2);
1767 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1768 break;
1769 }
1770 case JVM_CONSTANT_ClassIndex: {
1771 *bytes = JVM_CONSTANT_Class;
1772 idx1 = klass_index_at(idx);
1773 Bytes::put_Java_u2((address) (bytes+1), idx1);
1774 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1775 break;
1776 }
1777 case JVM_CONSTANT_StringIndex: {
1778 *bytes = JVM_CONSTANT_String;
1779 idx1 = string_index_at(idx);
1780 Bytes::put_Java_u2((address) (bytes+1), idx1);
1781 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1782 break;
1783 }
1784 case JVM_CONSTANT_MethodHandle:
1785 case JVM_CONSTANT_MethodHandleInError: {
1786 *bytes = JVM_CONSTANT_MethodHandle;
1787 int kind = method_handle_ref_kind_at(idx);
1788 idx1 = method_handle_index_at(idx);
1789 *(bytes+1) = (unsigned char) kind;
1790 Bytes::put_Java_u2((address) (bytes+2), idx1);
1791 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1792 break;
1793 }
1794 case JVM_CONSTANT_MethodType:
1795 case JVM_CONSTANT_MethodTypeInError: {
1796 *bytes = JVM_CONSTANT_MethodType;
1797 idx1 = method_type_index_at(idx);
1798 Bytes::put_Java_u2((address) (bytes+1), idx1);
1799 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1800 break;
1801 }
1802 case JVM_CONSTANT_InvokeDynamic: {
1803 *bytes = tag;
1804 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1805 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1806 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1807 Bytes::put_Java_u2((address) (bytes+1), idx1);
1808 Bytes::put_Java_u2((address) (bytes+3), idx2);
1809 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1810 break;
1811 }
1812 }
1813 DBG(printf("\n"));
1814 bytes += ent_size;
1815 size += ent_size;
1816 }
1817 assert(size == cpool_size, "Size mismatch");
1818
1819 // Keep temorarily for debugging until it's stable.
1820 DBG(print_cpool_bytes(cnt, start_bytes));
1821 return (int)(bytes - start_bytes);
1822 } /* end copy_cpool_bytes */
1823
1824 #undef DBG
1825
1826
1827 void ConstantPool::set_on_stack(const bool value) {
1828 if (value) {
1829 // Only record if it's not already set.
1830 if (!on_stack()) {
1831 _flags |= _on_stack;
1832 MetadataOnStackMark::record(this);
1833 }
1834 } else {
1835 // Clearing is done single-threadedly.
1836 _flags &= ~_on_stack;
1837 }
1838 }
1839
1840 // JSR 292 support for patching constant pool oops after the class is linked and
1841 // the oop array for resolved references are created.
1842 // We can't do this during classfile parsing, which is how the other indexes are
1843 // patched. The other patches are applied early for some error checking
1844 // so only defer the pseudo_strings.
1845 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
1846 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1847 Handle patch = cp_patches->at(index);
1848 if (patch.not_null()) {
1849 assert (tag_at(index).is_string(), "should only be string left");
1850 // Patching a string means pre-resolving it.
1851 // The spelling in the constant pool is ignored.
1852 // The constant reference may be any object whatever.
1853 // If it is not a real interned string, the constant is referred
1854 // to as a "pseudo-string", and must be presented to the CP
1855 // explicitly, because it may require scavenging.
1856 int obj_index = cp_to_object_index(index);
1857 pseudo_string_at_put(index, obj_index, patch());
1858 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1859 }
1860 }
1861 #ifdef ASSERT
1862 // Ensure that all the patches have been used.
1863 for (int index = 0; index < cp_patches->length(); index++) {
1864 assert(cp_patches->at(index).is_null(),
1865 "Unused constant pool patch at %d in class file %s",
1866 index,
1867 pool_holder()->external_name());
1868 }
1869 #endif // ASSERT
1870 }
1871
1872 #ifndef PRODUCT
1873
1874 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1875 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1876 guarantee(obj->is_constantPool(), "object must be constant pool");
1877 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1878 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1879
1880 for (int i = 0; i< cp->length(); i++) {
1881 if (cp->tag_at(i).is_unresolved_klass()) {
1882 // This will force loading of the class
1883 Klass* klass = cp->klass_at(i, CHECK);
1884 if (klass->is_instance_klass()) {
1885 // Force initialization of class
1886 InstanceKlass::cast(klass)->initialize(CHECK);
1887 }
1888 }
1889 }
1890 }
1891
1892 #endif
1893
1894
1895 // Printing
1896
1897 void ConstantPool::print_on(outputStream* st) const {
1898 assert(is_constantPool(), "must be constantPool");
1899 st->print_cr("%s", internal_name());
1900 if (flags() != 0) {
1901 st->print(" - flags: 0x%x", flags());
1902 if (has_preresolution()) st->print(" has_preresolution");
1903 if (on_stack()) st->print(" on_stack");
1904 st->cr();
1905 }
1906 if (pool_holder() != NULL) {
1907 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
1908 }
1909 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
1910 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
1911 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
1912
1913 for (int index = 1; index < length(); index++) { // Index 0 is unused
1914 ((ConstantPool*)this)->print_entry_on(index, st);
1915 switch (tag_at(index).value()) {
1916 case JVM_CONSTANT_Long :
1917 case JVM_CONSTANT_Double :
1918 index++; // Skip entry following eigth-byte constant
1919 }
1920
1921 }
1922 st->cr();
1923 }
1924
1925 // Print one constant pool entry
1926 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1927 EXCEPTION_MARK;
1928 st->print(" - %3d : ", index);
1929 tag_at(index).print_on(st);
1930 st->print(" : ");
1931 switch (tag_at(index).value()) {
1932 case JVM_CONSTANT_Class :
1933 { Klass* k = klass_at(index, CATCH);
1934 guarantee(k != NULL, "need klass");
1935 k->print_value_on(st);
1936 st->print(" {" PTR_FORMAT "}", p2i(k));
1937 }
1938 break;
1939 case JVM_CONSTANT_Fieldref :
1940 case JVM_CONSTANT_Methodref :
1941 case JVM_CONSTANT_InterfaceMethodref :
1942 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1943 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1944 break;
1945 case JVM_CONSTANT_String :
1946 if (is_pseudo_string_at(index)) {
1947 oop anObj = pseudo_string_at(index);
1948 anObj->print_value_on(st);
1949 st->print(" {" PTR_FORMAT "}", p2i(anObj));
1950 } else {
1951 unresolved_string_at(index)->print_value_on(st);
1952 }
1953 break;
1954 case JVM_CONSTANT_Integer :
1955 st->print("%d", int_at(index));
1956 break;
1957 case JVM_CONSTANT_Float :
1958 st->print("%f", float_at(index));
1959 break;
1960 case JVM_CONSTANT_Long :
1961 st->print_jlong(long_at(index));
1962 break;
1963 case JVM_CONSTANT_Double :
1964 st->print("%lf", double_at(index));
1965 break;
1966 case JVM_CONSTANT_NameAndType :
1967 st->print("name_index=%d", name_ref_index_at(index));
1968 st->print(" signature_index=%d", signature_ref_index_at(index));
1969 break;
1970 case JVM_CONSTANT_Utf8 :
1971 symbol_at(index)->print_value_on(st);
1972 break;
1973 case JVM_CONSTANT_UnresolvedClass : // fall-through
1974 case JVM_CONSTANT_UnresolvedClassInError: {
1975 CPSlot entry = slot_at(index);
1976 if (entry.is_resolved()) {
1977 entry.get_klass()->print_value_on(st);
1978 } else {
1979 entry.get_symbol()->print_value_on(st);
1980 }
1981 }
1982 break;
1983 case JVM_CONSTANT_MethodHandle :
1984 case JVM_CONSTANT_MethodHandleInError :
1985 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
1986 st->print(" ref_index=%d", method_handle_index_at(index));
1987 break;
1988 case JVM_CONSTANT_MethodType :
1989 case JVM_CONSTANT_MethodTypeInError :
1990 st->print("signature_index=%d", method_type_index_at(index));
1991 break;
1992 case JVM_CONSTANT_InvokeDynamic :
1993 {
1994 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1995 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1996 int argc = invoke_dynamic_argument_count_at(index);
1997 if (argc > 0) {
1998 for (int arg_i = 0; arg_i < argc; arg_i++) {
1999 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2000 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2001 }
2002 st->print("}");
2003 }
2004 }
2005 break;
2006 default:
2007 ShouldNotReachHere();
2008 break;
2009 }
2010 st->cr();
2011 }
2012
2013 void ConstantPool::print_value_on(outputStream* st) const {
2014 assert(is_constantPool(), "must be constantPool");
2015 st->print("constant pool [%d]", length());
2016 if (has_preresolution()) st->print("/preresolution");
2017 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2018 print_address_on(st);
2019 st->print(" for ");
2020 pool_holder()->print_value_on(st);
2021 if (pool_holder() != NULL) {
2022 bool extra = (pool_holder()->constants() != this);
2023 if (extra) st->print(" (extra)");
2024 }
2025 if (cache() != NULL) {
2026 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2027 }
2028 }
2029
2030 #if INCLUDE_SERVICES
2031 // Size Statistics
2032 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2033 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2034 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2035 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2036 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2037 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2038
2039 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2040 sz->_cp_refmap_bytes;
2041 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2042 }
2043 #endif // INCLUDE_SERVICES
2044
2045 // Verification
2046
2047 void ConstantPool::verify_on(outputStream* st) {
2048 guarantee(is_constantPool(), "object must be constant pool");
2049 for (int i = 0; i< length(); i++) {
2050 constantTag tag = tag_at(i);
2051 CPSlot entry = slot_at(i);
2052 if (tag.is_klass()) {
2053 if (entry.is_resolved()) {
2054 guarantee(entry.get_klass()->is_klass(), "should be klass");
2055 }
2056 } else if (tag.is_unresolved_klass()) {
2057 if (entry.is_resolved()) {
2058 guarantee(entry.get_klass()->is_klass(), "should be klass");
2059 }
2060 } else if (tag.is_symbol()) {
2061 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2062 } else if (tag.is_string()) {
2063 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2064 }
2065 }
2066 if (cache() != NULL) {
2067 // Note: cache() can be NULL before a class is completely setup or
2068 // in temporary constant pools used during constant pool merging
2069 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2070 }
2071 if (pool_holder() != NULL) {
2072 // Note: pool_holder() can be NULL in temporary constant pools
2073 // used during constant pool merging
2074 guarantee(pool_holder()->is_klass(), "should be klass");
2075 }
2076 }
2077
2078
2079 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2080 char *str = sym->as_utf8();
2081 unsigned int hash = compute_hash(str, sym->utf8_length());
2082 unsigned int index = hash % table_size();
2083
2084 // check if already in map
2085 // we prefer the first entry since it is more likely to be what was used in
2086 // the class file
2087 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2088 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2089 if (en->hash() == hash && en->symbol() == sym) {
2090 return; // already there
2091 }
2092 }
2093
2094 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2095 entry->set_next(bucket(index));
2096 _buckets[index].set_entry(entry);
2097 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2098 }
2099
2100 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2101 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2102 char *str = sym->as_utf8();
2103 int len = sym->utf8_length();
2104 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2105 unsigned int index = hash % table_size();
2106 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2107 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2108 if (en->hash() == hash && en->symbol() == sym) {
2109 return en;
2110 }
2111 }
2112 return NULL;
2113 }