1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/metadataOnStackMark.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/heapInspection.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "oops/constantPool.hpp"
37 #include "oops/instanceKlass.hpp"
38 #include "oops/objArrayKlass.hpp"
39 #include "runtime/fieldType.hpp"
40 #include "runtime/init.hpp"
41 #include "runtime/javaCalls.hpp"
42 #include "runtime/signature.hpp"
43 #include "runtime/synchronizer.hpp"
44 #include "runtime/vframe.hpp"
45
46 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
47 // Tags are RW but comment below applies to tags also.
48 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
49
50 int size = ConstantPool::size(length);
51
52 // CDS considerations:
53 // Allocate read-write but may be able to move to read-only at dumping time
54 // if all the klasses are resolved. The only other field that is writable is
55 // the resolved_references array, which is recreated at startup time.
56 // But that could be moved to InstanceKlass (although a pain to access from
57 // assembly code). Maybe it could be moved to the cpCache which is RW.
58 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
59 }
60
61 ConstantPool::ConstantPool(Array<u1>* tags) {
62 set_length(tags->length());
63 set_tags(NULL);
64 set_cache(NULL);
65 set_reference_map(NULL);
66 set_resolved_references(NULL);
67 set_operands(NULL);
68 set_pool_holder(NULL);
69 set_flags(0);
70
71 // only set to non-zero if constant pool is merged by RedefineClasses
72 set_version(0);
73
74 // initialize tag array
75 int length = tags->length();
76 for (int index = 0; index < length; index++) {
77 tags->at_put(index, JVM_CONSTANT_Invalid);
78 }
79 set_tags(tags);
80 }
81
82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
83 MetadataFactory::free_metadata(loader_data, cache());
84 set_cache(NULL);
85 MetadataFactory::free_array<jushort>(loader_data, operands());
86 set_operands(NULL);
87
88 release_C_heap_structures();
89
90 // free tag array
91 MetadataFactory::free_array<u1>(loader_data, tags());
92 set_tags(NULL);
93 }
94
95 void ConstantPool::release_C_heap_structures() {
96 // walk constant pool and decrement symbol reference counts
97 unreference_symbols();
98 }
99
100 objArrayOop ConstantPool::resolved_references() const {
101 return (objArrayOop)JNIHandles::resolve(_resolved_references);
102 }
103
104 // Create resolved_references array and mapping array for original cp indexes
105 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
106 // to map it back for resolving and some unlikely miscellaneous uses.
107 // The objects created by invokedynamic are appended to this list.
108 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
109 intStack reference_map,
110 int constant_pool_map_length,
111 TRAPS) {
112 // Initialized the resolved object cache.
113 int map_length = reference_map.length();
114 if (map_length > 0) {
115 // Only need mapping back to constant pool entries. The map isn't used for
116 // invokedynamic resolved_reference entries. The constant pool cache index
117 // has the mapping back to both the constant pool and to the resolved
118 // reference index.
119 if (constant_pool_map_length > 0) {
120 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK);
121
122 for (int i = 0; i < constant_pool_map_length; i++) {
123 int x = reference_map.at(i);
124 assert(x == (int)(jushort) x, "klass index is too big");
125 om->at_put(i, (jushort)x);
126 }
127 set_reference_map(om);
128 }
129
130 // Create Java array for holding resolved strings, methodHandles,
131 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
132 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
133 Handle refs_handle (THREAD, (oop)stom); // must handleize.
134 set_resolved_references(loader_data->add_handle(refs_handle));
135 }
136 }
137
138 // CDS support. Create a new resolved_references array.
139 void ConstantPool::restore_unshareable_info(TRAPS) {
140
141 // restore the C++ vtable from the shared archive
142 restore_vtable();
143
144 if (SystemDictionary::Object_klass_loaded()) {
145 // Recreate the object array and add to ClassLoaderData.
146 int map_length = resolved_reference_length();
147 if (map_length > 0) {
148 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
149 Handle refs_handle (THREAD, (oop)stom); // must handleize.
150
151 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
152 set_resolved_references(loader_data->add_handle(refs_handle));
153 }
154 }
155 }
156
157 void ConstantPool::remove_unshareable_info() {
158 // Resolved references are not in the shared archive.
159 // Save the length for restoration. It is not necessarily the same length
160 // as reference_map.length() if invokedynamic is saved.
161 set_resolved_reference_length(
162 resolved_references() != NULL ? resolved_references()->length() : 0);
163 set_resolved_references(NULL);
164 }
165
166 oop ConstantPool::lock() {
167 if (_pool_holder) {
168 // We re-use the _pool_holder's init_lock to reduce footprint.
169 // Notes on deadlocks:
170 // [1] This lock is a Java oop, so it can be recursively locked by
171 // the same thread without self-deadlocks.
172 // [2] Deadlock will happen if there is circular dependency between
173 // the <clinit> of two Java classes. However, in this case,
174 // the deadlock would have happened long before we reach
175 // ConstantPool::lock(), so reusing init_lock does not
176 // increase the possibility of deadlock.
177 return _pool_holder->init_lock();
178 } else {
179 return NULL;
180 }
181 }
182
183 int ConstantPool::cp_to_object_index(int cp_index) {
184 // this is harder don't do this so much.
185 for (int i = 0; i< reference_map()->length(); i++) {
186 if (reference_map()->at(i) == cp_index) return i;
187 // Zero entry is divider between constant pool indices for strings,
188 // method handles and method types. After that the index is a constant
189 // pool cache index for invokedynamic. Stop when zero (which can never
190 // be a constant pool index)
191 if (reference_map()->at(i) == 0) break;
192 }
193 // We might not find the index.
194 return _no_index_sentinel;
195 }
196
197 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
198 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
199 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
200 // tag is not updated atomicly.
201
202 CPSlot entry = this_oop->slot_at(which);
203 if (entry.is_resolved()) {
204 assert(entry.get_klass()->is_klass(), "must be");
205 // Already resolved - return entry.
206 return entry.get_klass();
207 }
208
209 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
210 // already has updated the object
211 assert(THREAD->is_Java_thread(), "must be a Java thread");
212 bool do_resolve = false;
213 bool in_error = false;
214
215 // Create a handle for the mirror. This will preserve the resolved class
216 // until the loader_data is registered.
217 Handle mirror_handle;
218
219 Symbol* name = NULL;
220 Handle loader;
221 {
222 oop cplock = this_oop->lock();
223 ObjectLocker ol(cplock , THREAD, cplock != NULL);
224
225 if (this_oop->tag_at(which).is_unresolved_klass()) {
226 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
227 in_error = true;
228 } else {
229 do_resolve = true;
230 name = this_oop->unresolved_klass_at(which);
231 loader = Handle(THREAD, this_oop->pool_holder()->class_loader());
232 }
233 }
234 } // unlocking constantPool
235
236
237 // The original attempt to resolve this constant pool entry failed so find the
238 // original error and throw it again (JVMS 5.4.3).
239 if (in_error) {
240 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
241 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
242 ResourceMark rm;
243 // exception text will be the class name
244 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
245 THROW_MSG_0(error, className);
246 }
247
248 if (do_resolve) {
249 // this_oop must be unlocked during resolve_or_fail
250 oop protection_domain = this_oop->pool_holder()->protection_domain();
251 Handle h_prot (THREAD, protection_domain);
252 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
253 KlassHandle k;
254 if (!HAS_PENDING_EXCEPTION) {
255 k = KlassHandle(THREAD, k_oop);
256 // preserve the resolved klass.
257 mirror_handle = Handle(THREAD, k_oop->java_mirror());
258 // Do access check for klasses
259 verify_constant_pool_resolve(this_oop, k, THREAD);
260 }
261
262 // Failed to resolve class. We must record the errors so that subsequent attempts
263 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
264 if (HAS_PENDING_EXCEPTION) {
265 ResourceMark rm;
266 Symbol* error = PENDING_EXCEPTION->klass()->name();
267
268 bool throw_orig_error = false;
269 {
270 oop cplock = this_oop->lock();
271 ObjectLocker ol(cplock, THREAD, cplock != NULL);
272
273 // some other thread has beaten us and has resolved the class.
274 if (this_oop->tag_at(which).is_klass()) {
275 CLEAR_PENDING_EXCEPTION;
276 entry = this_oop->resolved_klass_at(which);
277 return entry.get_klass();
278 }
279
280 if (!PENDING_EXCEPTION->
281 is_a(SystemDictionary::LinkageError_klass())) {
282 // Just throw the exception and don't prevent these classes from
283 // being loaded due to virtual machine errors like StackOverflow
284 // and OutOfMemoryError, etc, or if the thread was hit by stop()
285 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
286 }
287 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
288 SystemDictionary::add_resolution_error(this_oop, which, error);
289 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
290 } else {
291 // some other thread has put the class in error state.
292 error = SystemDictionary::find_resolution_error(this_oop, which);
293 assert(error != NULL, "checking");
294 throw_orig_error = true;
295 }
296 } // unlocked
297
298 if (throw_orig_error) {
299 CLEAR_PENDING_EXCEPTION;
300 ResourceMark rm;
301 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
302 THROW_MSG_0(error, className);
303 }
304
305 return 0;
306 }
307
308 if (TraceClassResolution && !k()->oop_is_array()) {
309 // skip resolving the constant pool so that this code get's
310 // called the next time some bytecodes refer to this class.
311 ResourceMark rm;
312 int line_number = -1;
313 const char * source_file = NULL;
314 if (JavaThread::current()->has_last_Java_frame()) {
315 // try to identify the method which called this function.
316 vframeStream vfst(JavaThread::current());
317 if (!vfst.at_end()) {
318 line_number = vfst.method()->line_number_from_bci(vfst.bci());
319 Symbol* s = vfst.method()->method_holder()->source_file_name();
320 if (s != NULL) {
321 source_file = s->as_C_string();
322 }
323 }
324 }
325 if (k() != this_oop->pool_holder()) {
326 // only print something if the classes are different
327 if (source_file != NULL) {
328 tty->print("RESOLVE %s %s %s:%d\n",
329 this_oop->pool_holder()->external_name(),
330 InstanceKlass::cast(k())->external_name(), source_file, line_number);
331 } else {
332 tty->print("RESOLVE %s %s\n",
333 this_oop->pool_holder()->external_name(),
334 InstanceKlass::cast(k())->external_name());
335 }
336 }
337 return k();
338 } else {
339 oop cplock = this_oop->lock();
340 ObjectLocker ol(cplock, THREAD, cplock != NULL);
341 // Only updated constant pool - if it is resolved.
342 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
343 if (do_resolve) {
344 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data();
345 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
346 this_oop->klass_at_put(which, k());
347 }
348 }
349 }
350
351 entry = this_oop->resolved_klass_at(which);
352 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
353 return entry.get_klass();
354 }
355
356
357 // Does not update ConstantPool* - to avoid any exception throwing. Used
358 // by compiler and exception handling. Also used to avoid classloads for
359 // instanceof operations. Returns NULL if the class has not been loaded or
360 // if the verification of constant pool failed
361 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
362 CPSlot entry = this_oop->slot_at(which);
363 if (entry.is_resolved()) {
364 assert(entry.get_klass()->is_klass(), "must be");
365 return entry.get_klass();
366 } else {
367 assert(entry.is_unresolved(), "must be either symbol or klass");
368 Thread *thread = Thread::current();
369 Symbol* name = entry.get_symbol();
370 oop loader = this_oop->pool_holder()->class_loader();
371 oop protection_domain = this_oop->pool_holder()->protection_domain();
372 Handle h_prot (thread, protection_domain);
373 Handle h_loader (thread, loader);
374 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
375
376 if (k != NULL) {
377 // Make sure that resolving is legal
378 EXCEPTION_MARK;
379 KlassHandle klass(THREAD, k);
380 // return NULL if verification fails
381 verify_constant_pool_resolve(this_oop, klass, THREAD);
382 if (HAS_PENDING_EXCEPTION) {
383 CLEAR_PENDING_EXCEPTION;
384 return NULL;
385 }
386 return klass();
387 } else {
388 return k;
389 }
390 }
391 }
392
393
394 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
395 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
396 }
397
398
399 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
400 int which) {
401 if (cpool->cache() == NULL) return NULL; // nothing to load yet
402 int cache_index = decode_cpcache_index(which, true);
403 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
404 // FIXME: should be an assert
405 if (PrintMiscellaneous && (Verbose||WizardMode)) {
406 tty->print_cr("bad operand %d in:", which); cpool->print();
407 }
408 return NULL;
409 }
410 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
411 return e->method_if_resolved(cpool);
412 }
413
414
415 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
416 if (cpool->cache() == NULL) return false; // nothing to load yet
417 int cache_index = decode_cpcache_index(which, true);
418 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
419 return e->has_appendix();
420 }
421
422 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
423 if (cpool->cache() == NULL) return NULL; // nothing to load yet
424 int cache_index = decode_cpcache_index(which, true);
425 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
426 return e->appendix_if_resolved(cpool);
427 }
428
429
430 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) {
431 if (cpool->cache() == NULL) return false; // nothing to load yet
432 int cache_index = decode_cpcache_index(which, true);
433 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
434 return e->has_method_type();
435 }
436
437 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) {
438 if (cpool->cache() == NULL) return NULL; // nothing to load yet
439 int cache_index = decode_cpcache_index(which, true);
440 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
441 return e->method_type_if_resolved(cpool);
442 }
443
444
445 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
446 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
447 return symbol_at(name_index);
448 }
449
450
451 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
452 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
453 return symbol_at(signature_index);
454 }
455
456
457 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
458 int i = which;
459 if (!uncached && cache() != NULL) {
460 if (ConstantPool::is_invokedynamic_index(which)) {
461 // Invokedynamic index is index into resolved_references
462 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
463 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
464 assert(tag_at(pool_index).is_name_and_type(), "");
465 return pool_index;
466 }
467 // change byte-ordering and go via cache
468 i = remap_instruction_operand_from_cache(which);
469 } else {
470 if (tag_at(which).is_invoke_dynamic()) {
471 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
472 assert(tag_at(pool_index).is_name_and_type(), "");
473 return pool_index;
474 }
475 }
476 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
477 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
478 jint ref_index = *int_at_addr(i);
479 return extract_high_short_from_int(ref_index);
480 }
481
482
483 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
484 guarantee(!ConstantPool::is_invokedynamic_index(which),
485 "an invokedynamic instruction does not have a klass");
486 int i = which;
487 if (!uncached && cache() != NULL) {
488 // change byte-ordering and go via cache
489 i = remap_instruction_operand_from_cache(which);
490 }
491 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
492 jint ref_index = *int_at_addr(i);
493 return extract_low_short_from_int(ref_index);
494 }
495
496
497
498 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
499 int cpc_index = operand;
500 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
501 assert((int)(u2)cpc_index == cpc_index, "clean u2");
502 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
503 return member_index;
504 }
505
506
507 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
508 if (k->oop_is_instance() || k->oop_is_objArray()) {
509 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
510 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
511 KlassHandle element (THREAD, elem_oop);
512
513 // The element type could be a typeArray - we only need the access check if it is
514 // an reference to another class
515 if (element->oop_is_instance()) {
516 LinkResolver::check_klass_accessability(holder, element, CHECK);
517 }
518 }
519 }
520
521
522 int ConstantPool::name_ref_index_at(int which_nt) {
523 jint ref_index = name_and_type_at(which_nt);
524 return extract_low_short_from_int(ref_index);
525 }
526
527
528 int ConstantPool::signature_ref_index_at(int which_nt) {
529 jint ref_index = name_and_type_at(which_nt);
530 return extract_high_short_from_int(ref_index);
531 }
532
533
534 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
535 return klass_at(klass_ref_index_at(which), CHECK_NULL);
536 }
537
538
539 Symbol* ConstantPool::klass_name_at(int which) {
540 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
541 "Corrupted constant pool");
542 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
543 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
544 // tag is not updated atomicly.
545 CPSlot entry = slot_at(which);
546 if (entry.is_resolved()) {
547 // Already resolved - return entry's name.
548 assert(entry.get_klass()->is_klass(), "must be");
549 return entry.get_klass()->name();
550 } else {
551 assert(entry.is_unresolved(), "must be either symbol or klass");
552 return entry.get_symbol();
553 }
554 }
555
556 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
557 jint ref_index = klass_ref_index_at(which);
558 return klass_at_noresolve(ref_index);
559 }
560
561 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
562 jint ref_index = uncached_klass_ref_index_at(which);
563 return klass_at_noresolve(ref_index);
564 }
565
566 char* ConstantPool::string_at_noresolve(int which) {
567 Symbol* s = unresolved_string_at(which);
568 if (s == NULL) {
569 return (char*)"<pseudo-string>";
570 } else {
571 return unresolved_string_at(which)->as_C_string();
572 }
573 }
574
575 BasicType ConstantPool::basic_type_for_signature_at(int which) {
576 return FieldType::basic_type(symbol_at(which));
577 }
578
579
580 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
581 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
582 if (this_oop->tag_at(index).is_string()) {
583 this_oop->string_at(index, CHECK);
584 }
585 }
586 }
587
588 // Resolve all the classes in the constant pool. If they are all resolved,
589 // the constant pool is read-only. Enhancement: allocate cp entries to
590 // another metaspace, and copy to read-only or read-write space if this
591 // bit is set.
592 bool ConstantPool::resolve_class_constants(TRAPS) {
593 constantPoolHandle cp(THREAD, this);
594 for (int index = 1; index < length(); index++) { // Index 0 is unused
595 if (tag_at(index).is_unresolved_klass() &&
596 klass_at_if_loaded(cp, index) == NULL) {
597 return false;
598 }
599 }
600 // set_preresolution(); or some bit for future use
601 return true;
602 }
603
604 // If resolution for MethodHandle or MethodType fails, save the exception
605 // in the resolution error table, so that the same exception is thrown again.
606 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
607 int tag, TRAPS) {
608 ResourceMark rm;
609 Symbol* error = PENDING_EXCEPTION->klass()->name();
610 oop cplock = this_oop->lock();
611 ObjectLocker ol(cplock, THREAD, cplock != NULL); // lock cpool to change tag.
612
613 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
614 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
615
616 if (!PENDING_EXCEPTION->
617 is_a(SystemDictionary::LinkageError_klass())) {
618 // Just throw the exception and don't prevent these classes from
619 // being loaded due to virtual machine errors like StackOverflow
620 // and OutOfMemoryError, etc, or if the thread was hit by stop()
621 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
622
623 } else if (this_oop->tag_at(which).value() != error_tag) {
624 SystemDictionary::add_resolution_error(this_oop, which, error);
625 this_oop->tag_at_put(which, error_tag);
626 } else {
627 // some other thread has put the class in error state.
628 error = SystemDictionary::find_resolution_error(this_oop, which);
629 assert(error != NULL, "checking");
630 CLEAR_PENDING_EXCEPTION;
631 THROW_MSG(error, "");
632 }
633 }
634
635
636 // Called to resolve constants in the constant pool and return an oop.
637 // Some constant pool entries cache their resolved oop. This is also
638 // called to create oops from constants to use in arguments for invokedynamic
639 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
640 oop result_oop = NULL;
641 Handle throw_exception;
642
643 if (cache_index == _possible_index_sentinel) {
644 // It is possible that this constant is one which is cached in the objects.
645 // We'll do a linear search. This should be OK because this usage is rare.
646 assert(index > 0, "valid index");
647 cache_index = this_oop->cp_to_object_index(index);
648 }
649 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
650 assert(index == _no_index_sentinel || index >= 0, "");
651
652 if (cache_index >= 0) {
653 result_oop = this_oop->resolved_references()->obj_at(cache_index);
654 if (result_oop != NULL) {
655 return result_oop;
656 // That was easy...
657 }
658 index = this_oop->object_to_cp_index(cache_index);
659 }
660
661 jvalue prim_value; // temp used only in a few cases below
662
663 int tag_value = this_oop->tag_at(index).value();
664
665 switch (tag_value) {
666
667 case JVM_CONSTANT_UnresolvedClass:
668 case JVM_CONSTANT_UnresolvedClassInError:
669 case JVM_CONSTANT_Class:
670 {
671 assert(cache_index == _no_index_sentinel, "should not have been set");
672 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
673 // ldc wants the java mirror.
674 result_oop = resolved->java_mirror();
675 break;
676 }
677
678 case JVM_CONSTANT_String:
679 assert(cache_index != _no_index_sentinel, "should have been set");
680 if (this_oop->is_pseudo_string_at(index)) {
681 result_oop = this_oop->pseudo_string_at(index, cache_index);
682 break;
683 }
684 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
685 break;
686
687 case JVM_CONSTANT_MethodHandleInError:
688 case JVM_CONSTANT_MethodTypeInError:
689 {
690 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
691 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
692 ResourceMark rm;
693 THROW_MSG_0(error, "");
694 break;
695 }
696
697 case JVM_CONSTANT_MethodHandle:
698 {
699 int ref_kind = this_oop->method_handle_ref_kind_at(index);
700 int callee_index = this_oop->method_handle_klass_index_at(index);
701 Symbol* name = this_oop->method_handle_name_ref_at(index);
702 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
703 if (PrintMiscellaneous)
704 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
705 ref_kind, index, this_oop->method_handle_index_at(index),
706 callee_index, name->as_C_string(), signature->as_C_string());
707 KlassHandle callee;
708 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
709 callee = KlassHandle(THREAD, k);
710 }
711 KlassHandle klass(THREAD, this_oop->pool_holder());
712 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
713 callee, name, signature,
714 THREAD);
715 result_oop = value();
716 if (HAS_PENDING_EXCEPTION) {
717 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
718 }
719 break;
720 }
721
722 case JVM_CONSTANT_MethodType:
723 {
724 Symbol* signature = this_oop->method_type_signature_at(index);
725 if (PrintMiscellaneous)
726 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
727 index, this_oop->method_type_index_at(index),
728 signature->as_C_string());
729 KlassHandle klass(THREAD, this_oop->pool_holder());
730 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
731 result_oop = value();
732 if (HAS_PENDING_EXCEPTION) {
733 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
734 }
735 break;
736 }
737
738 case JVM_CONSTANT_Integer:
739 assert(cache_index == _no_index_sentinel, "should not have been set");
740 prim_value.i = this_oop->int_at(index);
741 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
742 break;
743
744 case JVM_CONSTANT_Float:
745 assert(cache_index == _no_index_sentinel, "should not have been set");
746 prim_value.f = this_oop->float_at(index);
747 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
748 break;
749
750 case JVM_CONSTANT_Long:
751 assert(cache_index == _no_index_sentinel, "should not have been set");
752 prim_value.j = this_oop->long_at(index);
753 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
754 break;
755
756 case JVM_CONSTANT_Double:
757 assert(cache_index == _no_index_sentinel, "should not have been set");
758 prim_value.d = this_oop->double_at(index);
759 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
760 break;
761
762 default:
763 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
764 this_oop(), index, cache_index, tag_value) );
765 assert(false, "unexpected constant tag");
766 break;
767 }
768
769 if (cache_index >= 0) {
770 // Cache the oop here also.
771 Handle result_handle(THREAD, result_oop);
772 oop cplock = this_oop->lock();
773 ObjectLocker ol(cplock, THREAD, cplock != NULL); // don't know if we really need this
774 oop result = this_oop->resolved_references()->obj_at(cache_index);
775 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
776 // The important thing here is that all threads pick up the same result.
777 // It doesn't matter which racing thread wins, as long as only one
778 // result is used by all threads, and all future queries.
779 // That result may be either a resolved constant or a failure exception.
780 if (result == NULL) {
781 this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
782 return result_handle();
783 } else {
784 // Return the winning thread's result. This can be different than
785 // result_handle() for MethodHandles.
786 return result;
787 }
788 } else {
789 return result_oop;
790 }
791 }
792
793 oop ConstantPool::uncached_string_at(int which, TRAPS) {
794 Symbol* sym = unresolved_string_at(which);
795 oop str = StringTable::intern(sym, CHECK_(NULL));
796 assert(java_lang_String::is_instance(str), "must be string");
797 return str;
798 }
799
800
801 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
802 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
803
804 Handle bsm;
805 int argc;
806 {
807 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
808 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
809 // It is accompanied by the optional arguments.
810 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
811 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
812 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
813 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
814 }
815
816 // Extract the optional static arguments.
817 argc = this_oop->invoke_dynamic_argument_count_at(index);
818 if (argc == 0) return bsm_oop;
819
820 bsm = Handle(THREAD, bsm_oop);
821 }
822
823 objArrayHandle info;
824 {
825 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
826 info = objArrayHandle(THREAD, info_oop);
827 }
828
829 info->obj_at_put(0, bsm());
830 for (int i = 0; i < argc; i++) {
831 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
832 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
833 info->obj_at_put(1+i, arg_oop);
834 }
835
836 return info();
837 }
838
839 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
840 // If the string has already been interned, this entry will be non-null
841 oop str = this_oop->resolved_references()->obj_at(obj_index);
842 if (str != NULL) return str;
843
844 Symbol* sym = this_oop->unresolved_string_at(which);
845 str = StringTable::intern(sym, CHECK_(NULL));
846 this_oop->string_at_put(which, obj_index, str);
847 assert(java_lang_String::is_instance(str), "must be string");
848 return str;
849 }
850
851
852 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
853 int which) {
854 // Names are interned, so we can compare Symbol*s directly
855 Symbol* cp_name = klass_name_at(which);
856 return (cp_name == k->name());
857 }
858
859
860 // Iterate over symbols and decrement ones which are Symbol*s.
861 // This is done during GC so do not need to lock constantPool unless we
862 // have per-thread safepoints.
863 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
864 // these symbols but didn't increment the reference count.
865 void ConstantPool::unreference_symbols() {
866 for (int index = 1; index < length(); index++) { // Index 0 is unused
867 constantTag tag = tag_at(index);
868 if (tag.is_symbol()) {
869 symbol_at(index)->decrement_refcount();
870 }
871 }
872 }
873
874
875 // Compare this constant pool's entry at index1 to the constant pool
876 // cp2's entry at index2.
877 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
878 int index2, TRAPS) {
879
880 jbyte t1 = tag_at(index1).value();
881 jbyte t2 = cp2->tag_at(index2).value();
882
883
884 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
885 // when comparing
886 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
887 t1 = JVM_CONSTANT_UnresolvedClass;
888 }
889 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
890 t2 = JVM_CONSTANT_UnresolvedClass;
891 }
892
893 if (t1 != t2) {
894 // Not the same entry type so there is nothing else to check. Note
895 // that this style of checking will consider resolved/unresolved
896 // class pairs as different.
897 // From the ConstantPool* API point of view, this is correct
898 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
899 // plays out in the context of ConstantPool* merging.
900 return false;
901 }
902
903 switch (t1) {
904 case JVM_CONSTANT_Class:
905 {
906 Klass* k1 = klass_at(index1, CHECK_false);
907 Klass* k2 = cp2->klass_at(index2, CHECK_false);
908 if (k1 == k2) {
909 return true;
910 }
911 } break;
912
913 case JVM_CONSTANT_ClassIndex:
914 {
915 int recur1 = klass_index_at(index1);
916 int recur2 = cp2->klass_index_at(index2);
917 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
918 if (match) {
919 return true;
920 }
921 } break;
922
923 case JVM_CONSTANT_Double:
924 {
925 jdouble d1 = double_at(index1);
926 jdouble d2 = cp2->double_at(index2);
927 if (d1 == d2) {
928 return true;
929 }
930 } break;
931
932 case JVM_CONSTANT_Fieldref:
933 case JVM_CONSTANT_InterfaceMethodref:
934 case JVM_CONSTANT_Methodref:
935 {
936 int recur1 = uncached_klass_ref_index_at(index1);
937 int recur2 = cp2->uncached_klass_ref_index_at(index2);
938 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
939 if (match) {
940 recur1 = uncached_name_and_type_ref_index_at(index1);
941 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
942 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
943 if (match) {
944 return true;
945 }
946 }
947 } break;
948
949 case JVM_CONSTANT_Float:
950 {
951 jfloat f1 = float_at(index1);
952 jfloat f2 = cp2->float_at(index2);
953 if (f1 == f2) {
954 return true;
955 }
956 } break;
957
958 case JVM_CONSTANT_Integer:
959 {
960 jint i1 = int_at(index1);
961 jint i2 = cp2->int_at(index2);
962 if (i1 == i2) {
963 return true;
964 }
965 } break;
966
967 case JVM_CONSTANT_Long:
968 {
969 jlong l1 = long_at(index1);
970 jlong l2 = cp2->long_at(index2);
971 if (l1 == l2) {
972 return true;
973 }
974 } break;
975
976 case JVM_CONSTANT_NameAndType:
977 {
978 int recur1 = name_ref_index_at(index1);
979 int recur2 = cp2->name_ref_index_at(index2);
980 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
981 if (match) {
982 recur1 = signature_ref_index_at(index1);
983 recur2 = cp2->signature_ref_index_at(index2);
984 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
985 if (match) {
986 return true;
987 }
988 }
989 } break;
990
991 case JVM_CONSTANT_StringIndex:
992 {
993 int recur1 = string_index_at(index1);
994 int recur2 = cp2->string_index_at(index2);
995 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
996 if (match) {
997 return true;
998 }
999 } break;
1000
1001 case JVM_CONSTANT_UnresolvedClass:
1002 {
1003 Symbol* k1 = unresolved_klass_at(index1);
1004 Symbol* k2 = cp2->unresolved_klass_at(index2);
1005 if (k1 == k2) {
1006 return true;
1007 }
1008 } break;
1009
1010 case JVM_CONSTANT_MethodType:
1011 {
1012 int k1 = method_type_index_at(index1);
1013 int k2 = cp2->method_type_index_at(index2);
1014 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1015 if (match) {
1016 return true;
1017 }
1018 } break;
1019
1020 case JVM_CONSTANT_MethodHandle:
1021 {
1022 int k1 = method_handle_ref_kind_at(index1);
1023 int k2 = cp2->method_handle_ref_kind_at(index2);
1024 if (k1 == k2) {
1025 int i1 = method_handle_index_at(index1);
1026 int i2 = cp2->method_handle_index_at(index2);
1027 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1028 if (match) {
1029 return true;
1030 }
1031 }
1032 } break;
1033
1034 case JVM_CONSTANT_InvokeDynamic:
1035 {
1036 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1037 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1038 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1039 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1040 // separate statements and variables because CHECK_false is used
1041 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1042 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1043 return (match_entry && match_operand);
1044 } break;
1045
1046 case JVM_CONSTANT_String:
1047 {
1048 Symbol* s1 = unresolved_string_at(index1);
1049 Symbol* s2 = cp2->unresolved_string_at(index2);
1050 if (s1 == s2) {
1051 return true;
1052 }
1053 } break;
1054
1055 case JVM_CONSTANT_Utf8:
1056 {
1057 Symbol* s1 = symbol_at(index1);
1058 Symbol* s2 = cp2->symbol_at(index2);
1059 if (s1 == s2) {
1060 return true;
1061 }
1062 } break;
1063
1064 // Invalid is used as the tag for the second constant pool entry
1065 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1066 // not be seen by itself.
1067 case JVM_CONSTANT_Invalid: // fall through
1068
1069 default:
1070 ShouldNotReachHere();
1071 break;
1072 }
1073
1074 return false;
1075 } // end compare_entry_to()
1076
1077
1078 // Resize the operands array with delta_len and delta_size.
1079 // Used in RedefineClasses for CP merge.
1080 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1081 int old_len = operand_array_length(operands());
1082 int new_len = old_len + delta_len;
1083 int min_len = (delta_len > 0) ? old_len : new_len;
1084
1085 int old_size = operands()->length();
1086 int new_size = old_size + delta_size;
1087 int min_size = (delta_size > 0) ? old_size : new_size;
1088
1089 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1090 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1091
1092 // Set index in the resized array for existing elements only
1093 for (int idx = 0; idx < min_len; idx++) {
1094 int offset = operand_offset_at(idx); // offset in original array
1095 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1096 }
1097 // Copy the bootstrap specifiers only
1098 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1099 new_ops->adr_at(2*new_len),
1100 (min_size - 2*min_len) * sizeof(u2));
1101 // Explicitly deallocate old operands array.
1102 // Note, it is not needed for 7u backport.
1103 if ( operands() != NULL) { // the safety check
1104 MetadataFactory::free_array<u2>(loader_data, operands());
1105 }
1106 set_operands(new_ops);
1107 } // end resize_operands()
1108
1109
1110 // Extend the operands array with the length and size of the ext_cp operands.
1111 // Used in RedefineClasses for CP merge.
1112 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) {
1113 int delta_len = operand_array_length(ext_cp->operands());
1114 if (delta_len == 0) {
1115 return; // nothing to do
1116 }
1117 int delta_size = ext_cp->operands()->length();
1118
1119 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1120
1121 if (operand_array_length(operands()) == 0) {
1122 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1123 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1124 // The first element index defines the offset of second part
1125 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1126 set_operands(new_ops);
1127 } else {
1128 resize_operands(delta_len, delta_size, CHECK);
1129 }
1130
1131 } // end extend_operands()
1132
1133
1134 // Shrink the operands array to a smaller array with new_len length.
1135 // Used in RedefineClasses for CP merge.
1136 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1137 int old_len = operand_array_length(operands());
1138 if (new_len == old_len) {
1139 return; // nothing to do
1140 }
1141 assert(new_len < old_len, "shrunken operands array must be smaller");
1142
1143 int free_base = operand_next_offset_at(new_len - 1);
1144 int delta_len = new_len - old_len;
1145 int delta_size = 2*delta_len + free_base - operands()->length();
1146
1147 resize_operands(delta_len, delta_size, CHECK);
1148
1149 } // end shrink_operands()
1150
1151
1152 void ConstantPool::copy_operands(constantPoolHandle from_cp,
1153 constantPoolHandle to_cp,
1154 TRAPS) {
1155
1156 int from_oplen = operand_array_length(from_cp->operands());
1157 int old_oplen = operand_array_length(to_cp->operands());
1158 if (from_oplen != 0) {
1159 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1160 // append my operands to the target's operands array
1161 if (old_oplen == 0) {
1162 // Can't just reuse from_cp's operand list because of deallocation issues
1163 int len = from_cp->operands()->length();
1164 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1165 Copy::conjoint_memory_atomic(
1166 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1167 to_cp->set_operands(new_ops);
1168 } else {
1169 int old_len = to_cp->operands()->length();
1170 int from_len = from_cp->operands()->length();
1171 int old_off = old_oplen * sizeof(u2);
1172 int from_off = from_oplen * sizeof(u2);
1173 // Use the metaspace for the destination constant pool
1174 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1175 int fillp = 0, len = 0;
1176 // first part of dest
1177 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1178 new_operands->adr_at(fillp),
1179 (len = old_off) * sizeof(u2));
1180 fillp += len;
1181 // first part of src
1182 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1183 new_operands->adr_at(fillp),
1184 (len = from_off) * sizeof(u2));
1185 fillp += len;
1186 // second part of dest
1187 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1188 new_operands->adr_at(fillp),
1189 (len = old_len - old_off) * sizeof(u2));
1190 fillp += len;
1191 // second part of src
1192 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1193 new_operands->adr_at(fillp),
1194 (len = from_len - from_off) * sizeof(u2));
1195 fillp += len;
1196 assert(fillp == new_operands->length(), "");
1197
1198 // Adjust indexes in the first part of the copied operands array.
1199 for (int j = 0; j < from_oplen; j++) {
1200 int offset = operand_offset_at(new_operands, old_oplen + j);
1201 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1202 offset += old_len; // every new tuple is preceded by old_len extra u2's
1203 operand_offset_at_put(new_operands, old_oplen + j, offset);
1204 }
1205
1206 // replace target operands array with combined array
1207 to_cp->set_operands(new_operands);
1208 }
1209 }
1210 } // end copy_operands()
1211
1212
1213 // Copy this constant pool's entries at start_i to end_i (inclusive)
1214 // to the constant pool to_cp's entries starting at to_i. A total of
1215 // (end_i - start_i) + 1 entries are copied.
1216 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1217 constantPoolHandle to_cp, int to_i, TRAPS) {
1218
1219
1220 int dest_i = to_i; // leave original alone for debug purposes
1221
1222 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1223 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1224
1225 switch (from_cp->tag_at(src_i).value()) {
1226 case JVM_CONSTANT_Double:
1227 case JVM_CONSTANT_Long:
1228 // double and long take two constant pool entries
1229 src_i += 2;
1230 dest_i += 2;
1231 break;
1232
1233 default:
1234 // all others take one constant pool entry
1235 src_i++;
1236 dest_i++;
1237 break;
1238 }
1239 }
1240 copy_operands(from_cp, to_cp, CHECK);
1241
1242 } // end copy_cp_to_impl()
1243
1244
1245 // Copy this constant pool's entry at from_i to the constant pool
1246 // to_cp's entry at to_i.
1247 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1248 constantPoolHandle to_cp, int to_i,
1249 TRAPS) {
1250
1251 int tag = from_cp->tag_at(from_i).value();
1252 switch (tag) {
1253 case JVM_CONSTANT_Class:
1254 {
1255 Klass* k = from_cp->klass_at(from_i, CHECK);
1256 to_cp->klass_at_put(to_i, k);
1257 } break;
1258
1259 case JVM_CONSTANT_ClassIndex:
1260 {
1261 jint ki = from_cp->klass_index_at(from_i);
1262 to_cp->klass_index_at_put(to_i, ki);
1263 } break;
1264
1265 case JVM_CONSTANT_Double:
1266 {
1267 jdouble d = from_cp->double_at(from_i);
1268 to_cp->double_at_put(to_i, d);
1269 // double takes two constant pool entries so init second entry's tag
1270 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1271 } break;
1272
1273 case JVM_CONSTANT_Fieldref:
1274 {
1275 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1276 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1277 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1278 } break;
1279
1280 case JVM_CONSTANT_Float:
1281 {
1282 jfloat f = from_cp->float_at(from_i);
1283 to_cp->float_at_put(to_i, f);
1284 } break;
1285
1286 case JVM_CONSTANT_Integer:
1287 {
1288 jint i = from_cp->int_at(from_i);
1289 to_cp->int_at_put(to_i, i);
1290 } break;
1291
1292 case JVM_CONSTANT_InterfaceMethodref:
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->interface_method_at_put(to_i, class_index, name_and_type_index);
1297 } break;
1298
1299 case JVM_CONSTANT_Long:
1300 {
1301 jlong l = from_cp->long_at(from_i);
1302 to_cp->long_at_put(to_i, l);
1303 // long takes two constant pool entries so init second entry's tag
1304 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1305 } break;
1306
1307 case JVM_CONSTANT_Methodref:
1308 {
1309 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1310 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1311 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1312 } break;
1313
1314 case JVM_CONSTANT_NameAndType:
1315 {
1316 int name_ref_index = from_cp->name_ref_index_at(from_i);
1317 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1318 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1319 } break;
1320
1321 case JVM_CONSTANT_StringIndex:
1322 {
1323 jint si = from_cp->string_index_at(from_i);
1324 to_cp->string_index_at_put(to_i, si);
1325 } break;
1326
1327 case JVM_CONSTANT_UnresolvedClass:
1328 {
1329 // Can be resolved after checking tag, so check the slot first.
1330 CPSlot entry = from_cp->slot_at(from_i);
1331 if (entry.is_resolved()) {
1332 assert(entry.get_klass()->is_klass(), "must be");
1333 // Already resolved
1334 to_cp->klass_at_put(to_i, entry.get_klass());
1335 } else {
1336 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1337 }
1338 } break;
1339
1340 case JVM_CONSTANT_UnresolvedClassInError:
1341 {
1342 Symbol* k = from_cp->unresolved_klass_at(from_i);
1343 to_cp->unresolved_klass_at_put(to_i, k);
1344 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1345 } break;
1346
1347
1348 case JVM_CONSTANT_String:
1349 {
1350 Symbol* s = from_cp->unresolved_string_at(from_i);
1351 to_cp->unresolved_string_at_put(to_i, s);
1352 } break;
1353
1354 case JVM_CONSTANT_Utf8:
1355 {
1356 Symbol* s = from_cp->symbol_at(from_i);
1357 // Need to increase refcount, the old one will be thrown away and deferenced
1358 s->increment_refcount();
1359 to_cp->symbol_at_put(to_i, s);
1360 } break;
1361
1362 case JVM_CONSTANT_MethodType:
1363 {
1364 jint k = from_cp->method_type_index_at(from_i);
1365 to_cp->method_type_index_at_put(to_i, k);
1366 } break;
1367
1368 case JVM_CONSTANT_MethodHandle:
1369 {
1370 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1371 int k2 = from_cp->method_handle_index_at(from_i);
1372 to_cp->method_handle_index_at_put(to_i, k1, k2);
1373 } break;
1374
1375 case JVM_CONSTANT_InvokeDynamic:
1376 {
1377 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1378 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1379 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1380 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1381 } break;
1382
1383 // Invalid is used as the tag for the second constant pool entry
1384 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1385 // not be seen by itself.
1386 case JVM_CONSTANT_Invalid: // fall through
1387
1388 default:
1389 {
1390 ShouldNotReachHere();
1391 } break;
1392 }
1393 } // end copy_entry_to()
1394
1395
1396 // Search constant pool search_cp for an entry that matches this
1397 // constant pool's entry at pattern_i. Returns the index of a
1398 // matching entry or zero (0) if there is no matching entry.
1399 int ConstantPool::find_matching_entry(int pattern_i,
1400 constantPoolHandle search_cp, TRAPS) {
1401
1402 // index zero (0) is not used
1403 for (int i = 1; i < search_cp->length(); i++) {
1404 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1405 if (found) {
1406 return i;
1407 }
1408 }
1409
1410 return 0; // entry not found; return unused index zero (0)
1411 } // end find_matching_entry()
1412
1413
1414 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1415 // cp2's bootstrap specifier at idx2.
1416 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) {
1417 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1418 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1419 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1420
1421 if (!match) {
1422 return false;
1423 }
1424 int argc = operand_argument_count_at(idx1);
1425 if (argc == cp2->operand_argument_count_at(idx2)) {
1426 for (int j = 0; j < argc; j++) {
1427 k1 = operand_argument_index_at(idx1, j);
1428 k2 = cp2->operand_argument_index_at(idx2, j);
1429 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1430 if (!match) {
1431 return false;
1432 }
1433 }
1434 return true; // got through loop; all elements equal
1435 }
1436 return false;
1437 } // end compare_operand_to()
1438
1439 // Search constant pool search_cp for a bootstrap specifier that matches
1440 // this constant pool's bootstrap specifier at pattern_i index.
1441 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1442 int ConstantPool::find_matching_operand(int pattern_i,
1443 constantPoolHandle search_cp, int search_len, TRAPS) {
1444 for (int i = 0; i < search_len; i++) {
1445 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1446 if (found) {
1447 return i;
1448 }
1449 }
1450 return -1; // bootstrap specifier not found; return unused index (-1)
1451 } // end find_matching_operand()
1452
1453
1454 #ifndef PRODUCT
1455
1456 const char* ConstantPool::printable_name_at(int which) {
1457
1458 constantTag tag = tag_at(which);
1459
1460 if (tag.is_string()) {
1461 return string_at_noresolve(which);
1462 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1463 return klass_name_at(which)->as_C_string();
1464 } else if (tag.is_symbol()) {
1465 return symbol_at(which)->as_C_string();
1466 }
1467 return "";
1468 }
1469
1470 #endif // PRODUCT
1471
1472
1473 // JVMTI GetConstantPool support
1474
1475 // For debugging of constant pool
1476 const bool debug_cpool = false;
1477
1478 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1479
1480 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1481 const char* WARN_MSG = "Must not be such entry!";
1482 jint size = 0;
1483 u2 idx1, idx2;
1484
1485 for (jint idx = 1; idx < cnt; idx++) {
1486 jint ent_size = 0;
1487 u1 tag = *bytes++;
1488 size++; // count tag
1489
1490 printf("const #%03d, tag: %02d ", idx, tag);
1491 switch(tag) {
1492 case JVM_CONSTANT_Invalid: {
1493 printf("Invalid");
1494 break;
1495 }
1496 case JVM_CONSTANT_Unicode: {
1497 printf("Unicode %s", WARN_MSG);
1498 break;
1499 }
1500 case JVM_CONSTANT_Utf8: {
1501 u2 len = Bytes::get_Java_u2(bytes);
1502 char str[128];
1503 if (len > 127) {
1504 len = 127;
1505 }
1506 strncpy(str, (char *) (bytes+2), len);
1507 str[len] = '\0';
1508 printf("Utf8 \"%s\"", str);
1509 ent_size = 2 + len;
1510 break;
1511 }
1512 case JVM_CONSTANT_Integer: {
1513 u4 val = Bytes::get_Java_u4(bytes);
1514 printf("int %d", *(int *) &val);
1515 ent_size = 4;
1516 break;
1517 }
1518 case JVM_CONSTANT_Float: {
1519 u4 val = Bytes::get_Java_u4(bytes);
1520 printf("float %5.3ff", *(float *) &val);
1521 ent_size = 4;
1522 break;
1523 }
1524 case JVM_CONSTANT_Long: {
1525 u8 val = Bytes::get_Java_u8(bytes);
1526 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1527 ent_size = 8;
1528 idx++; // Long takes two cpool slots
1529 break;
1530 }
1531 case JVM_CONSTANT_Double: {
1532 u8 val = Bytes::get_Java_u8(bytes);
1533 printf("double %5.3fd", *(jdouble *)&val);
1534 ent_size = 8;
1535 idx++; // Double takes two cpool slots
1536 break;
1537 }
1538 case JVM_CONSTANT_Class: {
1539 idx1 = Bytes::get_Java_u2(bytes);
1540 printf("class #%03d", idx1);
1541 ent_size = 2;
1542 break;
1543 }
1544 case JVM_CONSTANT_String: {
1545 idx1 = Bytes::get_Java_u2(bytes);
1546 printf("String #%03d", idx1);
1547 ent_size = 2;
1548 break;
1549 }
1550 case JVM_CONSTANT_Fieldref: {
1551 idx1 = Bytes::get_Java_u2(bytes);
1552 idx2 = Bytes::get_Java_u2(bytes+2);
1553 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1554 ent_size = 4;
1555 break;
1556 }
1557 case JVM_CONSTANT_Methodref: {
1558 idx1 = Bytes::get_Java_u2(bytes);
1559 idx2 = Bytes::get_Java_u2(bytes+2);
1560 printf("Method #%03d, #%03d", idx1, idx2);
1561 ent_size = 4;
1562 break;
1563 }
1564 case JVM_CONSTANT_InterfaceMethodref: {
1565 idx1 = Bytes::get_Java_u2(bytes);
1566 idx2 = Bytes::get_Java_u2(bytes+2);
1567 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1568 ent_size = 4;
1569 break;
1570 }
1571 case JVM_CONSTANT_NameAndType: {
1572 idx1 = Bytes::get_Java_u2(bytes);
1573 idx2 = Bytes::get_Java_u2(bytes+2);
1574 printf("NameAndType #%03d, #%03d", idx1, idx2);
1575 ent_size = 4;
1576 break;
1577 }
1578 case JVM_CONSTANT_ClassIndex: {
1579 printf("ClassIndex %s", WARN_MSG);
1580 break;
1581 }
1582 case JVM_CONSTANT_UnresolvedClass: {
1583 printf("UnresolvedClass: %s", WARN_MSG);
1584 break;
1585 }
1586 case JVM_CONSTANT_UnresolvedClassInError: {
1587 printf("UnresolvedClassInErr: %s", WARN_MSG);
1588 break;
1589 }
1590 case JVM_CONSTANT_StringIndex: {
1591 printf("StringIndex: %s", WARN_MSG);
1592 break;
1593 }
1594 }
1595 printf(";\n");
1596 bytes += ent_size;
1597 size += ent_size;
1598 }
1599 printf("Cpool size: %d\n", size);
1600 fflush(0);
1601 return;
1602 } /* end print_cpool_bytes */
1603
1604
1605 // Returns size of constant pool entry.
1606 jint ConstantPool::cpool_entry_size(jint idx) {
1607 switch(tag_at(idx).value()) {
1608 case JVM_CONSTANT_Invalid:
1609 case JVM_CONSTANT_Unicode:
1610 return 1;
1611
1612 case JVM_CONSTANT_Utf8:
1613 return 3 + symbol_at(idx)->utf8_length();
1614
1615 case JVM_CONSTANT_Class:
1616 case JVM_CONSTANT_String:
1617 case JVM_CONSTANT_ClassIndex:
1618 case JVM_CONSTANT_UnresolvedClass:
1619 case JVM_CONSTANT_UnresolvedClassInError:
1620 case JVM_CONSTANT_StringIndex:
1621 case JVM_CONSTANT_MethodType:
1622 return 3;
1623
1624 case JVM_CONSTANT_MethodHandle:
1625 return 4; //tag, ref_kind, ref_index
1626
1627 case JVM_CONSTANT_Integer:
1628 case JVM_CONSTANT_Float:
1629 case JVM_CONSTANT_Fieldref:
1630 case JVM_CONSTANT_Methodref:
1631 case JVM_CONSTANT_InterfaceMethodref:
1632 case JVM_CONSTANT_NameAndType:
1633 return 5;
1634
1635 case JVM_CONSTANT_InvokeDynamic:
1636 // u1 tag, u2 bsm, u2 nt
1637 return 5;
1638
1639 case JVM_CONSTANT_Long:
1640 case JVM_CONSTANT_Double:
1641 return 9;
1642 }
1643 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1644 return 1;
1645 } /* end cpool_entry_size */
1646
1647
1648 // SymbolHashMap is used to find a constant pool index from a string.
1649 // This function fills in SymbolHashMaps, one for utf8s and one for
1650 // class names, returns size of the cpool raw bytes.
1651 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1652 SymbolHashMap *classmap) {
1653 jint size = 0;
1654
1655 for (u2 idx = 1; idx < length(); idx++) {
1656 u2 tag = tag_at(idx).value();
1657 size += cpool_entry_size(idx);
1658
1659 switch(tag) {
1660 case JVM_CONSTANT_Utf8: {
1661 Symbol* sym = symbol_at(idx);
1662 symmap->add_entry(sym, idx);
1663 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1664 break;
1665 }
1666 case JVM_CONSTANT_Class:
1667 case JVM_CONSTANT_UnresolvedClass:
1668 case JVM_CONSTANT_UnresolvedClassInError: {
1669 Symbol* sym = klass_name_at(idx);
1670 classmap->add_entry(sym, idx);
1671 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1672 break;
1673 }
1674 case JVM_CONSTANT_Long:
1675 case JVM_CONSTANT_Double: {
1676 idx++; // Both Long and Double take two cpool slots
1677 break;
1678 }
1679 }
1680 }
1681 return size;
1682 } /* end hash_utf8_entries_to */
1683
1684
1685 // Copy cpool bytes.
1686 // Returns:
1687 // 0, in case of OutOfMemoryError
1688 // -1, in case of internal error
1689 // > 0, count of the raw cpool bytes that have been copied
1690 int ConstantPool::copy_cpool_bytes(int cpool_size,
1691 SymbolHashMap* tbl,
1692 unsigned char *bytes) {
1693 u2 idx1, idx2;
1694 jint size = 0;
1695 jint cnt = length();
1696 unsigned char *start_bytes = bytes;
1697
1698 for (jint idx = 1; idx < cnt; idx++) {
1699 u1 tag = tag_at(idx).value();
1700 jint ent_size = cpool_entry_size(idx);
1701
1702 assert(size + ent_size <= cpool_size, "Size mismatch");
1703
1704 *bytes = tag;
1705 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1706 switch(tag) {
1707 case JVM_CONSTANT_Invalid: {
1708 DBG(printf("JVM_CONSTANT_Invalid"));
1709 break;
1710 }
1711 case JVM_CONSTANT_Unicode: {
1712 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1713 DBG(printf("JVM_CONSTANT_Unicode"));
1714 break;
1715 }
1716 case JVM_CONSTANT_Utf8: {
1717 Symbol* sym = symbol_at(idx);
1718 char* str = sym->as_utf8();
1719 // Warning! It's crashing on x86 with len = sym->utf8_length()
1720 int len = (int) strlen(str);
1721 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1722 for (int i = 0; i < len; i++) {
1723 bytes[3+i] = (u1) str[i];
1724 }
1725 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1726 break;
1727 }
1728 case JVM_CONSTANT_Integer: {
1729 jint val = int_at(idx);
1730 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1731 break;
1732 }
1733 case JVM_CONSTANT_Float: {
1734 jfloat val = float_at(idx);
1735 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1736 break;
1737 }
1738 case JVM_CONSTANT_Long: {
1739 jlong val = long_at(idx);
1740 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1741 idx++; // Long takes two cpool slots
1742 break;
1743 }
1744 case JVM_CONSTANT_Double: {
1745 jdouble val = double_at(idx);
1746 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1747 idx++; // Double takes two cpool slots
1748 break;
1749 }
1750 case JVM_CONSTANT_Class:
1751 case JVM_CONSTANT_UnresolvedClass:
1752 case JVM_CONSTANT_UnresolvedClassInError: {
1753 *bytes = JVM_CONSTANT_Class;
1754 Symbol* sym = klass_name_at(idx);
1755 idx1 = tbl->symbol_to_value(sym);
1756 assert(idx1 != 0, "Have not found a hashtable entry");
1757 Bytes::put_Java_u2((address) (bytes+1), idx1);
1758 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1759 break;
1760 }
1761 case JVM_CONSTANT_String: {
1762 *bytes = JVM_CONSTANT_String;
1763 Symbol* sym = unresolved_string_at(idx);
1764 idx1 = tbl->symbol_to_value(sym);
1765 assert(idx1 != 0, "Have not found a hashtable entry");
1766 Bytes::put_Java_u2((address) (bytes+1), idx1);
1767 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1768 break;
1769 }
1770 case JVM_CONSTANT_Fieldref:
1771 case JVM_CONSTANT_Methodref:
1772 case JVM_CONSTANT_InterfaceMethodref: {
1773 idx1 = uncached_klass_ref_index_at(idx);
1774 idx2 = uncached_name_and_type_ref_index_at(idx);
1775 Bytes::put_Java_u2((address) (bytes+1), idx1);
1776 Bytes::put_Java_u2((address) (bytes+3), idx2);
1777 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1778 break;
1779 }
1780 case JVM_CONSTANT_NameAndType: {
1781 idx1 = name_ref_index_at(idx);
1782 idx2 = signature_ref_index_at(idx);
1783 Bytes::put_Java_u2((address) (bytes+1), idx1);
1784 Bytes::put_Java_u2((address) (bytes+3), idx2);
1785 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1786 break;
1787 }
1788 case JVM_CONSTANT_ClassIndex: {
1789 *bytes = JVM_CONSTANT_Class;
1790 idx1 = klass_index_at(idx);
1791 Bytes::put_Java_u2((address) (bytes+1), idx1);
1792 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1793 break;
1794 }
1795 case JVM_CONSTANT_StringIndex: {
1796 *bytes = JVM_CONSTANT_String;
1797 idx1 = string_index_at(idx);
1798 Bytes::put_Java_u2((address) (bytes+1), idx1);
1799 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1800 break;
1801 }
1802 case JVM_CONSTANT_MethodHandle:
1803 case JVM_CONSTANT_MethodHandleInError: {
1804 *bytes = JVM_CONSTANT_MethodHandle;
1805 int kind = method_handle_ref_kind_at(idx);
1806 idx1 = method_handle_index_at(idx);
1807 *(bytes+1) = (unsigned char) kind;
1808 Bytes::put_Java_u2((address) (bytes+2), idx1);
1809 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1810 break;
1811 }
1812 case JVM_CONSTANT_MethodType:
1813 case JVM_CONSTANT_MethodTypeInError: {
1814 *bytes = JVM_CONSTANT_MethodType;
1815 idx1 = method_type_index_at(idx);
1816 Bytes::put_Java_u2((address) (bytes+1), idx1);
1817 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1818 break;
1819 }
1820 case JVM_CONSTANT_InvokeDynamic: {
1821 *bytes = tag;
1822 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1823 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1824 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1825 Bytes::put_Java_u2((address) (bytes+1), idx1);
1826 Bytes::put_Java_u2((address) (bytes+3), idx2);
1827 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1828 break;
1829 }
1830 }
1831 DBG(printf("\n"));
1832 bytes += ent_size;
1833 size += ent_size;
1834 }
1835 assert(size == cpool_size, "Size mismatch");
1836
1837 // Keep temorarily for debugging until it's stable.
1838 DBG(print_cpool_bytes(cnt, start_bytes));
1839 return (int)(bytes - start_bytes);
1840 } /* end copy_cpool_bytes */
1841
1842 #undef DBG
1843
1844
1845 void ConstantPool::set_on_stack(const bool value) {
1846 if (value) {
1847 _flags |= _on_stack;
1848 } else {
1849 _flags &= ~_on_stack;
1850 }
1851 if (value) MetadataOnStackMark::record(this);
1852 }
1853
1854 // JSR 292 support for patching constant pool oops after the class is linked and
1855 // the oop array for resolved references are created.
1856 // We can't do this during classfile parsing, which is how the other indexes are
1857 // patched. The other patches are applied early for some error checking
1858 // so only defer the pseudo_strings.
1859 void ConstantPool::patch_resolved_references(
1860 GrowableArray<Handle>* cp_patches) {
1861 assert(EnableInvokeDynamic, "");
1862 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1863 Handle patch = cp_patches->at(index);
1864 if (patch.not_null()) {
1865 assert (tag_at(index).is_string(), "should only be string left");
1866 // Patching a string means pre-resolving it.
1867 // The spelling in the constant pool is ignored.
1868 // The constant reference may be any object whatever.
1869 // If it is not a real interned string, the constant is referred
1870 // to as a "pseudo-string", and must be presented to the CP
1871 // explicitly, because it may require scavenging.
1872 int obj_index = cp_to_object_index(index);
1873 pseudo_string_at_put(index, obj_index, patch());
1874 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1875 }
1876 }
1877 #ifdef ASSERT
1878 // Ensure that all the patches have been used.
1879 for (int index = 0; index < cp_patches->length(); index++) {
1880 assert(cp_patches->at(index).is_null(),
1881 err_msg("Unused constant pool patch at %d in class file %s",
1882 index,
1883 pool_holder()->external_name()));
1884 }
1885 #endif // ASSERT
1886 }
1887
1888 #ifndef PRODUCT
1889
1890 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1891 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1892 guarantee(obj->is_constantPool(), "object must be constant pool");
1893 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1894 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1895
1896 for (int i = 0; i< cp->length(); i++) {
1897 if (cp->tag_at(i).is_unresolved_klass()) {
1898 // This will force loading of the class
1899 Klass* klass = cp->klass_at(i, CHECK);
1900 if (klass->oop_is_instance()) {
1901 // Force initialization of class
1902 InstanceKlass::cast(klass)->initialize(CHECK);
1903 }
1904 }
1905 }
1906 }
1907
1908 #endif
1909
1910
1911 // Printing
1912
1913 void ConstantPool::print_on(outputStream* st) const {
1914 EXCEPTION_MARK;
1915 assert(is_constantPool(), "must be constantPool");
1916 st->print_cr(internal_name());
1917 if (flags() != 0) {
1918 st->print(" - flags: 0x%x", flags());
1919 if (has_preresolution()) st->print(" has_preresolution");
1920 if (on_stack()) st->print(" on_stack");
1921 st->cr();
1922 }
1923 if (pool_holder() != NULL) {
1924 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
1925 }
1926 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
1927 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references());
1928 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
1929
1930 for (int index = 1; index < length(); index++) { // Index 0 is unused
1931 ((ConstantPool*)this)->print_entry_on(index, st);
1932 switch (tag_at(index).value()) {
1933 case JVM_CONSTANT_Long :
1934 case JVM_CONSTANT_Double :
1935 index++; // Skip entry following eigth-byte constant
1936 }
1937
1938 }
1939 st->cr();
1940 }
1941
1942 // Print one constant pool entry
1943 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1944 EXCEPTION_MARK;
1945 st->print(" - %3d : ", index);
1946 tag_at(index).print_on(st);
1947 st->print(" : ");
1948 switch (tag_at(index).value()) {
1949 case JVM_CONSTANT_Class :
1950 { Klass* k = klass_at(index, CATCH);
1951 guarantee(k != NULL, "need klass");
1952 k->print_value_on(st);
1953 st->print(" {0x%lx}", (address)k);
1954 }
1955 break;
1956 case JVM_CONSTANT_Fieldref :
1957 case JVM_CONSTANT_Methodref :
1958 case JVM_CONSTANT_InterfaceMethodref :
1959 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1960 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1961 break;
1962 case JVM_CONSTANT_String :
1963 if (is_pseudo_string_at(index)) {
1964 oop anObj = pseudo_string_at(index);
1965 anObj->print_value_on(st);
1966 st->print(" {0x%lx}", (address)anObj);
1967 } else {
1968 unresolved_string_at(index)->print_value_on(st);
1969 }
1970 break;
1971 case JVM_CONSTANT_Integer :
1972 st->print("%d", int_at(index));
1973 break;
1974 case JVM_CONSTANT_Float :
1975 st->print("%f", float_at(index));
1976 break;
1977 case JVM_CONSTANT_Long :
1978 st->print_jlong(long_at(index));
1979 break;
1980 case JVM_CONSTANT_Double :
1981 st->print("%lf", double_at(index));
1982 break;
1983 case JVM_CONSTANT_NameAndType :
1984 st->print("name_index=%d", name_ref_index_at(index));
1985 st->print(" signature_index=%d", signature_ref_index_at(index));
1986 break;
1987 case JVM_CONSTANT_Utf8 :
1988 symbol_at(index)->print_value_on(st);
1989 break;
1990 case JVM_CONSTANT_UnresolvedClass : // fall-through
1991 case JVM_CONSTANT_UnresolvedClassInError: {
1992 // unresolved_klass_at requires lock or safe world.
1993 CPSlot entry = slot_at(index);
1994 if (entry.is_resolved()) {
1995 entry.get_klass()->print_value_on(st);
1996 } else {
1997 entry.get_symbol()->print_value_on(st);
1998 }
1999 }
2000 break;
2001 case JVM_CONSTANT_MethodHandle :
2002 case JVM_CONSTANT_MethodHandleInError :
2003 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2004 st->print(" ref_index=%d", method_handle_index_at(index));
2005 break;
2006 case JVM_CONSTANT_MethodType :
2007 case JVM_CONSTANT_MethodTypeInError :
2008 st->print("signature_index=%d", method_type_index_at(index));
2009 break;
2010 case JVM_CONSTANT_InvokeDynamic :
2011 {
2012 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
2013 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
2014 int argc = invoke_dynamic_argument_count_at(index);
2015 if (argc > 0) {
2016 for (int arg_i = 0; arg_i < argc; arg_i++) {
2017 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2018 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2019 }
2020 st->print("}");
2021 }
2022 }
2023 break;
2024 default:
2025 ShouldNotReachHere();
2026 break;
2027 }
2028 st->cr();
2029 }
2030
2031 void ConstantPool::print_value_on(outputStream* st) const {
2032 assert(is_constantPool(), "must be constantPool");
2033 st->print("constant pool [%d]", length());
2034 if (has_preresolution()) st->print("/preresolution");
2035 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2036 print_address_on(st);
2037 st->print(" for ");
2038 pool_holder()->print_value_on(st);
2039 if (pool_holder() != NULL) {
2040 bool extra = (pool_holder()->constants() != this);
2041 if (extra) st->print(" (extra)");
2042 }
2043 if (cache() != NULL) {
2044 st->print(" cache=" PTR_FORMAT, cache());
2045 }
2046 }
2047
2048 #if INCLUDE_SERVICES
2049 // Size Statistics
2050 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2051 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2052 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2053 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2054 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2055 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2056
2057 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2058 sz->_cp_refmap_bytes;
2059 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2060 }
2061 #endif // INCLUDE_SERVICES
2062
2063 // Verification
2064
2065 void ConstantPool::verify_on(outputStream* st) {
2066 guarantee(is_constantPool(), "object must be constant pool");
2067 for (int i = 0; i< length(); i++) {
2068 constantTag tag = tag_at(i);
2069 CPSlot entry = slot_at(i);
2070 if (tag.is_klass()) {
2071 if (entry.is_resolved()) {
2072 guarantee(entry.get_klass()->is_klass(), "should be klass");
2073 }
2074 } else if (tag.is_unresolved_klass()) {
2075 if (entry.is_resolved()) {
2076 guarantee(entry.get_klass()->is_klass(), "should be klass");
2077 }
2078 } else if (tag.is_symbol()) {
2079 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2080 } else if (tag.is_string()) {
2081 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2082 }
2083 }
2084 if (cache() != NULL) {
2085 // Note: cache() can be NULL before a class is completely setup or
2086 // in temporary constant pools used during constant pool merging
2087 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2088 }
2089 if (pool_holder() != NULL) {
2090 // Note: pool_holder() can be NULL in temporary constant pools
2091 // used during constant pool merging
2092 guarantee(pool_holder()->is_klass(), "should be klass");
2093 }
2094 }
2095
2096
2097 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2098 char *str = sym->as_utf8();
2099 unsigned int hash = compute_hash(str, sym->utf8_length());
2100 unsigned int index = hash % table_size();
2101
2102 // check if already in map
2103 // we prefer the first entry since it is more likely to be what was used in
2104 // the class file
2105 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2106 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2107 if (en->hash() == hash && en->symbol() == sym) {
2108 return; // already there
2109 }
2110 }
2111
2112 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2113 entry->set_next(bucket(index));
2114 _buckets[index].set_entry(entry);
2115 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2116 }
2117
2118 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2119 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2120 char *str = sym->as_utf8();
2121 int len = sym->utf8_length();
2122 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2123 unsigned int index = hash % table_size();
2124 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2125 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2126 if (en->hash() == hash && en->symbol() == sym) {
2127 return en;
2128 }
2129 }
2130 return NULL;
2131 }