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 // This is an interface for the compiler that allows accessing non-resolved entries
400 // in the constant pool - but still performs the validations tests. Must be used
401 // in a pre-parse of the compiler - to determine what it can do and not do.
402 // Note: We cannot update the ConstantPool from the vm_thread.
403 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
404 int which = this_oop->klass_ref_index_at(index);
405 CPSlot entry = this_oop->slot_at(which);
406 if (entry.is_resolved()) {
407 assert(entry.get_klass()->is_klass(), "must be");
408 return entry.get_klass();
409 } else {
410 assert(entry.is_unresolved(), "must be either symbol or klass");
411 Symbol* name = entry.get_symbol();
412 oop loader = this_oop->pool_holder()->class_loader();
413 oop protection_domain = this_oop->pool_holder()->protection_domain();
414 Handle h_loader(THREAD, loader);
415 Handle h_prot (THREAD, protection_domain);
416 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
417
418 // Do access check for klasses
419 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
420 return k();
421 }
422 }
423
424
425 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
426 int which) {
427 if (cpool->cache() == NULL) return NULL; // nothing to load yet
428 int cache_index = decode_cpcache_index(which, true);
429 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
430 // FIXME: should be an assert
431 if (PrintMiscellaneous && (Verbose||WizardMode)) {
432 tty->print_cr("bad operand %d in:", which); cpool->print();
433 }
434 return NULL;
435 }
436 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
437 return e->method_if_resolved(cpool);
438 }
439
440
441 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
442 if (cpool->cache() == NULL) return false; // nothing to load yet
443 int cache_index = decode_cpcache_index(which, true);
444 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
445 return e->has_appendix();
446 }
447
448 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
449 if (cpool->cache() == NULL) return NULL; // nothing to load yet
450 int cache_index = decode_cpcache_index(which, true);
451 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
452 return e->appendix_if_resolved(cpool);
453 }
454
455
456 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) {
457 if (cpool->cache() == NULL) return false; // nothing to load yet
458 int cache_index = decode_cpcache_index(which, true);
459 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
460 return e->has_method_type();
461 }
462
463 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) {
464 if (cpool->cache() == NULL) return NULL; // nothing to load yet
465 int cache_index = decode_cpcache_index(which, true);
466 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
467 return e->method_type_if_resolved(cpool);
468 }
469
470
471 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
472 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
473 return symbol_at(name_index);
474 }
475
476
477 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
478 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
479 return symbol_at(signature_index);
480 }
481
482
483 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
484 int i = which;
485 if (!uncached && cache() != NULL) {
486 if (ConstantPool::is_invokedynamic_index(which)) {
487 // Invokedynamic index is index into resolved_references
488 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
489 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
490 assert(tag_at(pool_index).is_name_and_type(), "");
491 return pool_index;
492 }
493 // change byte-ordering and go via cache
494 i = remap_instruction_operand_from_cache(which);
495 } else {
496 if (tag_at(which).is_invoke_dynamic()) {
497 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
498 assert(tag_at(pool_index).is_name_and_type(), "");
499 return pool_index;
500 }
501 }
502 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
503 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
504 jint ref_index = *int_at_addr(i);
505 return extract_high_short_from_int(ref_index);
506 }
507
508
509 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
510 guarantee(!ConstantPool::is_invokedynamic_index(which),
511 "an invokedynamic instruction does not have a klass");
512 int i = which;
513 if (!uncached && cache() != NULL) {
514 // change byte-ordering and go via cache
515 i = remap_instruction_operand_from_cache(which);
516 }
517 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
518 jint ref_index = *int_at_addr(i);
519 return extract_low_short_from_int(ref_index);
520 }
521
522
523
524 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
525 int cpc_index = operand;
526 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
527 assert((int)(u2)cpc_index == cpc_index, "clean u2");
528 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
529 return member_index;
530 }
531
532
533 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
534 if (k->oop_is_instance() || k->oop_is_objArray()) {
535 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
536 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
537 KlassHandle element (THREAD, elem_oop);
538
539 // The element type could be a typeArray - we only need the access check if it is
540 // an reference to another class
541 if (element->oop_is_instance()) {
542 LinkResolver::check_klass_accessability(holder, element, CHECK);
543 }
544 }
545 }
546
547
548 int ConstantPool::name_ref_index_at(int which_nt) {
549 jint ref_index = name_and_type_at(which_nt);
550 return extract_low_short_from_int(ref_index);
551 }
552
553
554 int ConstantPool::signature_ref_index_at(int which_nt) {
555 jint ref_index = name_and_type_at(which_nt);
556 return extract_high_short_from_int(ref_index);
557 }
558
559
560 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
561 return klass_at(klass_ref_index_at(which), CHECK_NULL);
562 }
563
564
565 Symbol* ConstantPool::klass_name_at(int which) {
566 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
567 "Corrupted constant pool");
568 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
569 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
570 // tag is not updated atomicly.
571 CPSlot entry = slot_at(which);
572 if (entry.is_resolved()) {
573 // Already resolved - return entry's name.
574 assert(entry.get_klass()->is_klass(), "must be");
575 return entry.get_klass()->name();
576 } else {
577 assert(entry.is_unresolved(), "must be either symbol or klass");
578 return entry.get_symbol();
579 }
580 }
581
582 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
583 jint ref_index = klass_ref_index_at(which);
584 return klass_at_noresolve(ref_index);
585 }
586
587 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
588 jint ref_index = uncached_klass_ref_index_at(which);
589 return klass_at_noresolve(ref_index);
590 }
591
592 char* ConstantPool::string_at_noresolve(int which) {
593 Symbol* s = unresolved_string_at(which);
594 if (s == NULL) {
595 return (char*)"<pseudo-string>";
596 } else {
597 return unresolved_string_at(which)->as_C_string();
598 }
599 }
600
601 BasicType ConstantPool::basic_type_for_signature_at(int which) {
602 return FieldType::basic_type(symbol_at(which));
603 }
604
605
606 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
607 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
608 if (this_oop->tag_at(index).is_string()) {
609 this_oop->string_at(index, CHECK);
610 }
611 }
612 }
613
614 // Resolve all the classes in the constant pool. If they are all resolved,
615 // the constant pool is read-only. Enhancement: allocate cp entries to
616 // another metaspace, and copy to read-only or read-write space if this
617 // bit is set.
618 bool ConstantPool::resolve_class_constants(TRAPS) {
619 constantPoolHandle cp(THREAD, this);
620 for (int index = 1; index < length(); index++) { // Index 0 is unused
621 if (tag_at(index).is_unresolved_klass() &&
622 klass_at_if_loaded(cp, index) == NULL) {
623 return false;
624 }
625 }
626 // set_preresolution(); or some bit for future use
627 return true;
628 }
629
630 // If resolution for MethodHandle or MethodType fails, save the exception
631 // in the resolution error table, so that the same exception is thrown again.
632 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
633 int tag, TRAPS) {
634 ResourceMark rm;
635 Symbol* error = PENDING_EXCEPTION->klass()->name();
636 oop cplock = this_oop->lock();
637 ObjectLocker ol(cplock, THREAD, cplock != NULL); // lock cpool to change tag.
638
639 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
640 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
641
642 if (!PENDING_EXCEPTION->
643 is_a(SystemDictionary::LinkageError_klass())) {
644 // Just throw the exception and don't prevent these classes from
645 // being loaded due to virtual machine errors like StackOverflow
646 // and OutOfMemoryError, etc, or if the thread was hit by stop()
647 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
648
649 } else if (this_oop->tag_at(which).value() != error_tag) {
650 SystemDictionary::add_resolution_error(this_oop, which, error);
651 this_oop->tag_at_put(which, error_tag);
652 } else {
653 // some other thread has put the class in error state.
654 error = SystemDictionary::find_resolution_error(this_oop, which);
655 assert(error != NULL, "checking");
656 CLEAR_PENDING_EXCEPTION;
657 THROW_MSG(error, "");
658 }
659 }
660
661
662 // Called to resolve constants in the constant pool and return an oop.
663 // Some constant pool entries cache their resolved oop. This is also
664 // called to create oops from constants to use in arguments for invokedynamic
665 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
666 oop result_oop = NULL;
667 Handle throw_exception;
668
669 if (cache_index == _possible_index_sentinel) {
670 // It is possible that this constant is one which is cached in the objects.
671 // We'll do a linear search. This should be OK because this usage is rare.
672 assert(index > 0, "valid index");
673 cache_index = this_oop->cp_to_object_index(index);
674 }
675 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
676 assert(index == _no_index_sentinel || index >= 0, "");
677
678 if (cache_index >= 0) {
679 result_oop = this_oop->resolved_references()->obj_at(cache_index);
680 if (result_oop != NULL) {
681 return result_oop;
682 // That was easy...
683 }
684 index = this_oop->object_to_cp_index(cache_index);
685 }
686
687 jvalue prim_value; // temp used only in a few cases below
688
689 int tag_value = this_oop->tag_at(index).value();
690
691 switch (tag_value) {
692
693 case JVM_CONSTANT_UnresolvedClass:
694 case JVM_CONSTANT_UnresolvedClassInError:
695 case JVM_CONSTANT_Class:
696 {
697 assert(cache_index == _no_index_sentinel, "should not have been set");
698 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
699 // ldc wants the java mirror.
700 result_oop = resolved->java_mirror();
701 break;
702 }
703
704 case JVM_CONSTANT_String:
705 assert(cache_index != _no_index_sentinel, "should have been set");
706 if (this_oop->is_pseudo_string_at(index)) {
707 result_oop = this_oop->pseudo_string_at(index, cache_index);
708 break;
709 }
710 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
711 break;
712
713 case JVM_CONSTANT_MethodHandleInError:
714 case JVM_CONSTANT_MethodTypeInError:
715 {
716 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
717 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
718 ResourceMark rm;
719 THROW_MSG_0(error, "");
720 break;
721 }
722
723 case JVM_CONSTANT_MethodHandle:
724 {
725 int ref_kind = this_oop->method_handle_ref_kind_at(index);
726 int callee_index = this_oop->method_handle_klass_index_at(index);
727 Symbol* name = this_oop->method_handle_name_ref_at(index);
728 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
729 if (PrintMiscellaneous)
730 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
731 ref_kind, index, this_oop->method_handle_index_at(index),
732 callee_index, name->as_C_string(), signature->as_C_string());
733 KlassHandle callee;
734 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
735 callee = KlassHandle(THREAD, k);
736 }
737 KlassHandle klass(THREAD, this_oop->pool_holder());
738 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
739 callee, name, signature,
740 THREAD);
741 result_oop = value();
742 if (HAS_PENDING_EXCEPTION) {
743 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
744 }
745 break;
746 }
747
748 case JVM_CONSTANT_MethodType:
749 {
750 Symbol* signature = this_oop->method_type_signature_at(index);
751 if (PrintMiscellaneous)
752 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
753 index, this_oop->method_type_index_at(index),
754 signature->as_C_string());
755 KlassHandle klass(THREAD, this_oop->pool_holder());
756 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
757 result_oop = value();
758 if (HAS_PENDING_EXCEPTION) {
759 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
760 }
761 break;
762 }
763
764 case JVM_CONSTANT_Integer:
765 assert(cache_index == _no_index_sentinel, "should not have been set");
766 prim_value.i = this_oop->int_at(index);
767 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
768 break;
769
770 case JVM_CONSTANT_Float:
771 assert(cache_index == _no_index_sentinel, "should not have been set");
772 prim_value.f = this_oop->float_at(index);
773 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
774 break;
775
776 case JVM_CONSTANT_Long:
777 assert(cache_index == _no_index_sentinel, "should not have been set");
778 prim_value.j = this_oop->long_at(index);
779 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
780 break;
781
782 case JVM_CONSTANT_Double:
783 assert(cache_index == _no_index_sentinel, "should not have been set");
784 prim_value.d = this_oop->double_at(index);
785 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
786 break;
787
788 default:
789 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
790 this_oop(), index, cache_index, tag_value) );
791 assert(false, "unexpected constant tag");
792 break;
793 }
794
795 if (cache_index >= 0) {
796 // Cache the oop here also.
797 Handle result_handle(THREAD, result_oop);
798 oop cplock = this_oop->lock();
799 ObjectLocker ol(cplock, THREAD, cplock != NULL); // don't know if we really need this
800 oop result = this_oop->resolved_references()->obj_at(cache_index);
801 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
802 // The important thing here is that all threads pick up the same result.
803 // It doesn't matter which racing thread wins, as long as only one
804 // result is used by all threads, and all future queries.
805 // That result may be either a resolved constant or a failure exception.
806 if (result == NULL) {
807 this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
808 return result_handle();
809 } else {
810 // Return the winning thread's result. This can be different than
811 // result_handle() for MethodHandles.
812 return result;
813 }
814 } else {
815 return result_oop;
816 }
817 }
818
819 oop ConstantPool::uncached_string_at(int which, TRAPS) {
820 Symbol* sym = unresolved_string_at(which);
821 oop str = StringTable::intern(sym, CHECK_(NULL));
822 assert(java_lang_String::is_instance(str), "must be string");
823 return str;
824 }
825
826
827 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
828 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
829
830 Handle bsm;
831 int argc;
832 {
833 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
834 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
835 // It is accompanied by the optional arguments.
836 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
837 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
838 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
839 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
840 }
841
842 // Extract the optional static arguments.
843 argc = this_oop->invoke_dynamic_argument_count_at(index);
844 if (argc == 0) return bsm_oop;
845
846 bsm = Handle(THREAD, bsm_oop);
847 }
848
849 objArrayHandle info;
850 {
851 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
852 info = objArrayHandle(THREAD, info_oop);
853 }
854
855 info->obj_at_put(0, bsm());
856 for (int i = 0; i < argc; i++) {
857 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
858 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
859 info->obj_at_put(1+i, arg_oop);
860 }
861
862 return info();
863 }
864
865 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
866 // If the string has already been interned, this entry will be non-null
867 oop str = this_oop->resolved_references()->obj_at(obj_index);
868 if (str != NULL) return str;
869
870 Symbol* sym = this_oop->unresolved_string_at(which);
871 str = StringTable::intern(sym, CHECK_(NULL));
872 this_oop->string_at_put(which, obj_index, str);
873 assert(java_lang_String::is_instance(str), "must be string");
874 return str;
875 }
876
877
878 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
879 int which) {
880 // Names are interned, so we can compare Symbol*s directly
881 Symbol* cp_name = klass_name_at(which);
882 return (cp_name == k->name());
883 }
884
885
886 // Iterate over symbols and decrement ones which are Symbol*s.
887 // This is done during GC so do not need to lock constantPool unless we
888 // have per-thread safepoints.
889 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
890 // these symbols but didn't increment the reference count.
891 void ConstantPool::unreference_symbols() {
892 for (int index = 1; index < length(); index++) { // Index 0 is unused
893 constantTag tag = tag_at(index);
894 if (tag.is_symbol()) {
895 symbol_at(index)->decrement_refcount();
896 }
897 }
898 }
899
900
901 // Compare this constant pool's entry at index1 to the constant pool
902 // cp2's entry at index2.
903 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
904 int index2, TRAPS) {
905
906 jbyte t1 = tag_at(index1).value();
907 jbyte t2 = cp2->tag_at(index2).value();
908
909
910 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
911 // when comparing
912 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
913 t1 = JVM_CONSTANT_UnresolvedClass;
914 }
915 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
916 t2 = JVM_CONSTANT_UnresolvedClass;
917 }
918
919 if (t1 != t2) {
920 // Not the same entry type so there is nothing else to check. Note
921 // that this style of checking will consider resolved/unresolved
922 // class pairs as different.
923 // From the ConstantPool* API point of view, this is correct
924 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
925 // plays out in the context of ConstantPool* merging.
926 return false;
927 }
928
929 switch (t1) {
930 case JVM_CONSTANT_Class:
931 {
932 Klass* k1 = klass_at(index1, CHECK_false);
933 Klass* k2 = cp2->klass_at(index2, CHECK_false);
934 if (k1 == k2) {
935 return true;
936 }
937 } break;
938
939 case JVM_CONSTANT_ClassIndex:
940 {
941 int recur1 = klass_index_at(index1);
942 int recur2 = cp2->klass_index_at(index2);
943 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
944 if (match) {
945 return true;
946 }
947 } break;
948
949 case JVM_CONSTANT_Double:
950 {
951 jdouble d1 = double_at(index1);
952 jdouble d2 = cp2->double_at(index2);
953 if (d1 == d2) {
954 return true;
955 }
956 } break;
957
958 case JVM_CONSTANT_Fieldref:
959 case JVM_CONSTANT_InterfaceMethodref:
960 case JVM_CONSTANT_Methodref:
961 {
962 int recur1 = uncached_klass_ref_index_at(index1);
963 int recur2 = cp2->uncached_klass_ref_index_at(index2);
964 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
965 if (match) {
966 recur1 = uncached_name_and_type_ref_index_at(index1);
967 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
968 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
969 if (match) {
970 return true;
971 }
972 }
973 } break;
974
975 case JVM_CONSTANT_Float:
976 {
977 jfloat f1 = float_at(index1);
978 jfloat f2 = cp2->float_at(index2);
979 if (f1 == f2) {
980 return true;
981 }
982 } break;
983
984 case JVM_CONSTANT_Integer:
985 {
986 jint i1 = int_at(index1);
987 jint i2 = cp2->int_at(index2);
988 if (i1 == i2) {
989 return true;
990 }
991 } break;
992
993 case JVM_CONSTANT_Long:
994 {
995 jlong l1 = long_at(index1);
996 jlong l2 = cp2->long_at(index2);
997 if (l1 == l2) {
998 return true;
999 }
1000 } break;
1001
1002 case JVM_CONSTANT_NameAndType:
1003 {
1004 int recur1 = name_ref_index_at(index1);
1005 int recur2 = cp2->name_ref_index_at(index2);
1006 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1007 if (match) {
1008 recur1 = signature_ref_index_at(index1);
1009 recur2 = cp2->signature_ref_index_at(index2);
1010 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1011 if (match) {
1012 return true;
1013 }
1014 }
1015 } break;
1016
1017 case JVM_CONSTANT_StringIndex:
1018 {
1019 int recur1 = string_index_at(index1);
1020 int recur2 = cp2->string_index_at(index2);
1021 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1022 if (match) {
1023 return true;
1024 }
1025 } break;
1026
1027 case JVM_CONSTANT_UnresolvedClass:
1028 {
1029 Symbol* k1 = unresolved_klass_at(index1);
1030 Symbol* k2 = cp2->unresolved_klass_at(index2);
1031 if (k1 == k2) {
1032 return true;
1033 }
1034 } break;
1035
1036 case JVM_CONSTANT_MethodType:
1037 {
1038 int k1 = method_type_index_at(index1);
1039 int k2 = cp2->method_type_index_at(index2);
1040 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1041 if (match) {
1042 return true;
1043 }
1044 } break;
1045
1046 case JVM_CONSTANT_MethodHandle:
1047 {
1048 int k1 = method_handle_ref_kind_at(index1);
1049 int k2 = cp2->method_handle_ref_kind_at(index2);
1050 if (k1 == k2) {
1051 int i1 = method_handle_index_at(index1);
1052 int i2 = cp2->method_handle_index_at(index2);
1053 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1054 if (match) {
1055 return true;
1056 }
1057 }
1058 } break;
1059
1060 case JVM_CONSTANT_InvokeDynamic:
1061 {
1062 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1063 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1064 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1065 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1066 // separate statements and variables because CHECK_false is used
1067 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1068 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1069 return (match_entry && match_operand);
1070 } break;
1071
1072 case JVM_CONSTANT_String:
1073 {
1074 Symbol* s1 = unresolved_string_at(index1);
1075 Symbol* s2 = cp2->unresolved_string_at(index2);
1076 if (s1 == s2) {
1077 return true;
1078 }
1079 } break;
1080
1081 case JVM_CONSTANT_Utf8:
1082 {
1083 Symbol* s1 = symbol_at(index1);
1084 Symbol* s2 = cp2->symbol_at(index2);
1085 if (s1 == s2) {
1086 return true;
1087 }
1088 } break;
1089
1090 // Invalid is used as the tag for the second constant pool entry
1091 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1092 // not be seen by itself.
1093 case JVM_CONSTANT_Invalid: // fall through
1094
1095 default:
1096 ShouldNotReachHere();
1097 break;
1098 }
1099
1100 return false;
1101 } // end compare_entry_to()
1102
1103
1104 // Resize the operands array with delta_len and delta_size.
1105 // Used in RedefineClasses for CP merge.
1106 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1107 int old_len = operand_array_length(operands());
1108 int new_len = old_len + delta_len;
1109 int min_len = (delta_len > 0) ? old_len : new_len;
1110
1111 int old_size = operands()->length();
1112 int new_size = old_size + delta_size;
1113 int min_size = (delta_size > 0) ? old_size : new_size;
1114
1115 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1116 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1117
1118 // Set index in the resized array for existing elements only
1119 for (int idx = 0; idx < min_len; idx++) {
1120 int offset = operand_offset_at(idx); // offset in original array
1121 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1122 }
1123 // Copy the bootstrap specifiers only
1124 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1125 new_ops->adr_at(2*new_len),
1126 (min_size - 2*min_len) * sizeof(u2));
1127 // Explicitly deallocate old operands array.
1128 // Note, it is not needed for 7u backport.
1129 if ( operands() != NULL) { // the safety check
1130 MetadataFactory::free_array<u2>(loader_data, operands());
1131 }
1132 set_operands(new_ops);
1133 } // end resize_operands()
1134
1135
1136 // Extend the operands array with the length and size of the ext_cp operands.
1137 // Used in RedefineClasses for CP merge.
1138 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) {
1139 int delta_len = operand_array_length(ext_cp->operands());
1140 if (delta_len == 0) {
1141 return; // nothing to do
1142 }
1143 int delta_size = ext_cp->operands()->length();
1144
1145 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1146
1147 if (operand_array_length(operands()) == 0) {
1148 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1149 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1150 // The first element index defines the offset of second part
1151 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1152 set_operands(new_ops);
1153 } else {
1154 resize_operands(delta_len, delta_size, CHECK);
1155 }
1156
1157 } // end extend_operands()
1158
1159
1160 // Shrink the operands array to a smaller array with new_len length.
1161 // Used in RedefineClasses for CP merge.
1162 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1163 int old_len = operand_array_length(operands());
1164 if (new_len == old_len) {
1165 return; // nothing to do
1166 }
1167 assert(new_len < old_len, "shrunken operands array must be smaller");
1168
1169 int free_base = operand_next_offset_at(new_len - 1);
1170 int delta_len = new_len - old_len;
1171 int delta_size = 2*delta_len + free_base - operands()->length();
1172
1173 resize_operands(delta_len, delta_size, CHECK);
1174
1175 } // end shrink_operands()
1176
1177
1178 void ConstantPool::copy_operands(constantPoolHandle from_cp,
1179 constantPoolHandle to_cp,
1180 TRAPS) {
1181
1182 int from_oplen = operand_array_length(from_cp->operands());
1183 int old_oplen = operand_array_length(to_cp->operands());
1184 if (from_oplen != 0) {
1185 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1186 // append my operands to the target's operands array
1187 if (old_oplen == 0) {
1188 // Can't just reuse from_cp's operand list because of deallocation issues
1189 int len = from_cp->operands()->length();
1190 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1191 Copy::conjoint_memory_atomic(
1192 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1193 to_cp->set_operands(new_ops);
1194 } else {
1195 int old_len = to_cp->operands()->length();
1196 int from_len = from_cp->operands()->length();
1197 int old_off = old_oplen * sizeof(u2);
1198 int from_off = from_oplen * sizeof(u2);
1199 // Use the metaspace for the destination constant pool
1200 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1201 int fillp = 0, len = 0;
1202 // first part of dest
1203 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1204 new_operands->adr_at(fillp),
1205 (len = old_off) * sizeof(u2));
1206 fillp += len;
1207 // first part of src
1208 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1209 new_operands->adr_at(fillp),
1210 (len = from_off) * sizeof(u2));
1211 fillp += len;
1212 // second part of dest
1213 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1214 new_operands->adr_at(fillp),
1215 (len = old_len - old_off) * sizeof(u2));
1216 fillp += len;
1217 // second part of src
1218 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1219 new_operands->adr_at(fillp),
1220 (len = from_len - from_off) * sizeof(u2));
1221 fillp += len;
1222 assert(fillp == new_operands->length(), "");
1223
1224 // Adjust indexes in the first part of the copied operands array.
1225 for (int j = 0; j < from_oplen; j++) {
1226 int offset = operand_offset_at(new_operands, old_oplen + j);
1227 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1228 offset += old_len; // every new tuple is preceded by old_len extra u2's
1229 operand_offset_at_put(new_operands, old_oplen + j, offset);
1230 }
1231
1232 // replace target operands array with combined array
1233 to_cp->set_operands(new_operands);
1234 }
1235 }
1236 } // end copy_operands()
1237
1238
1239 // Copy this constant pool's entries at start_i to end_i (inclusive)
1240 // to the constant pool to_cp's entries starting at to_i. A total of
1241 // (end_i - start_i) + 1 entries are copied.
1242 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1243 constantPoolHandle to_cp, int to_i, TRAPS) {
1244
1245
1246 int dest_i = to_i; // leave original alone for debug purposes
1247
1248 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1249 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1250
1251 switch (from_cp->tag_at(src_i).value()) {
1252 case JVM_CONSTANT_Double:
1253 case JVM_CONSTANT_Long:
1254 // double and long take two constant pool entries
1255 src_i += 2;
1256 dest_i += 2;
1257 break;
1258
1259 default:
1260 // all others take one constant pool entry
1261 src_i++;
1262 dest_i++;
1263 break;
1264 }
1265 }
1266 copy_operands(from_cp, to_cp, CHECK);
1267
1268 } // end copy_cp_to_impl()
1269
1270
1271 // Copy this constant pool's entry at from_i to the constant pool
1272 // to_cp's entry at to_i.
1273 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1274 constantPoolHandle to_cp, int to_i,
1275 TRAPS) {
1276
1277 int tag = from_cp->tag_at(from_i).value();
1278 switch (tag) {
1279 case JVM_CONSTANT_Class:
1280 {
1281 Klass* k = from_cp->klass_at(from_i, CHECK);
1282 to_cp->klass_at_put(to_i, k);
1283 } break;
1284
1285 case JVM_CONSTANT_ClassIndex:
1286 {
1287 jint ki = from_cp->klass_index_at(from_i);
1288 to_cp->klass_index_at_put(to_i, ki);
1289 } break;
1290
1291 case JVM_CONSTANT_Double:
1292 {
1293 jdouble d = from_cp->double_at(from_i);
1294 to_cp->double_at_put(to_i, d);
1295 // double takes two constant pool entries so init second entry's tag
1296 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1297 } break;
1298
1299 case JVM_CONSTANT_Fieldref:
1300 {
1301 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1302 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1303 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1304 } break;
1305
1306 case JVM_CONSTANT_Float:
1307 {
1308 jfloat f = from_cp->float_at(from_i);
1309 to_cp->float_at_put(to_i, f);
1310 } break;
1311
1312 case JVM_CONSTANT_Integer:
1313 {
1314 jint i = from_cp->int_at(from_i);
1315 to_cp->int_at_put(to_i, i);
1316 } break;
1317
1318 case JVM_CONSTANT_InterfaceMethodref:
1319 {
1320 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1321 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1322 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1323 } break;
1324
1325 case JVM_CONSTANT_Long:
1326 {
1327 jlong l = from_cp->long_at(from_i);
1328 to_cp->long_at_put(to_i, l);
1329 // long takes two constant pool entries so init second entry's tag
1330 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1331 } break;
1332
1333 case JVM_CONSTANT_Methodref:
1334 {
1335 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1336 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1337 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1338 } break;
1339
1340 case JVM_CONSTANT_NameAndType:
1341 {
1342 int name_ref_index = from_cp->name_ref_index_at(from_i);
1343 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1344 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1345 } break;
1346
1347 case JVM_CONSTANT_StringIndex:
1348 {
1349 jint si = from_cp->string_index_at(from_i);
1350 to_cp->string_index_at_put(to_i, si);
1351 } break;
1352
1353 case JVM_CONSTANT_UnresolvedClass:
1354 {
1355 // Can be resolved after checking tag, so check the slot first.
1356 CPSlot entry = from_cp->slot_at(from_i);
1357 if (entry.is_resolved()) {
1358 assert(entry.get_klass()->is_klass(), "must be");
1359 // Already resolved
1360 to_cp->klass_at_put(to_i, entry.get_klass());
1361 } else {
1362 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1363 }
1364 } break;
1365
1366 case JVM_CONSTANT_UnresolvedClassInError:
1367 {
1368 Symbol* k = from_cp->unresolved_klass_at(from_i);
1369 to_cp->unresolved_klass_at_put(to_i, k);
1370 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1371 } break;
1372
1373
1374 case JVM_CONSTANT_String:
1375 {
1376 Symbol* s = from_cp->unresolved_string_at(from_i);
1377 to_cp->unresolved_string_at_put(to_i, s);
1378 } break;
1379
1380 case JVM_CONSTANT_Utf8:
1381 {
1382 Symbol* s = from_cp->symbol_at(from_i);
1383 // Need to increase refcount, the old one will be thrown away and deferenced
1384 s->increment_refcount();
1385 to_cp->symbol_at_put(to_i, s);
1386 } break;
1387
1388 case JVM_CONSTANT_MethodType:
1389 {
1390 jint k = from_cp->method_type_index_at(from_i);
1391 to_cp->method_type_index_at_put(to_i, k);
1392 } break;
1393
1394 case JVM_CONSTANT_MethodHandle:
1395 {
1396 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1397 int k2 = from_cp->method_handle_index_at(from_i);
1398 to_cp->method_handle_index_at_put(to_i, k1, k2);
1399 } break;
1400
1401 case JVM_CONSTANT_InvokeDynamic:
1402 {
1403 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1404 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1405 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1406 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1407 } break;
1408
1409 // Invalid is used as the tag for the second constant pool entry
1410 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1411 // not be seen by itself.
1412 case JVM_CONSTANT_Invalid: // fall through
1413
1414 default:
1415 {
1416 ShouldNotReachHere();
1417 } break;
1418 }
1419 } // end copy_entry_to()
1420
1421
1422 // Search constant pool search_cp for an entry that matches this
1423 // constant pool's entry at pattern_i. Returns the index of a
1424 // matching entry or zero (0) if there is no matching entry.
1425 int ConstantPool::find_matching_entry(int pattern_i,
1426 constantPoolHandle search_cp, TRAPS) {
1427
1428 // index zero (0) is not used
1429 for (int i = 1; i < search_cp->length(); i++) {
1430 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1431 if (found) {
1432 return i;
1433 }
1434 }
1435
1436 return 0; // entry not found; return unused index zero (0)
1437 } // end find_matching_entry()
1438
1439
1440 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1441 // cp2's bootstrap specifier at idx2.
1442 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) {
1443 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1444 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1445 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1446
1447 if (!match) {
1448 return false;
1449 }
1450 int argc = operand_argument_count_at(idx1);
1451 if (argc == cp2->operand_argument_count_at(idx2)) {
1452 for (int j = 0; j < argc; j++) {
1453 k1 = operand_argument_index_at(idx1, j);
1454 k2 = cp2->operand_argument_index_at(idx2, j);
1455 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1456 if (!match) {
1457 return false;
1458 }
1459 }
1460 return true; // got through loop; all elements equal
1461 }
1462 return false;
1463 } // end compare_operand_to()
1464
1465 // Search constant pool search_cp for a bootstrap specifier that matches
1466 // this constant pool's bootstrap specifier at pattern_i index.
1467 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1468 int ConstantPool::find_matching_operand(int pattern_i,
1469 constantPoolHandle search_cp, int search_len, TRAPS) {
1470 for (int i = 0; i < search_len; i++) {
1471 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1472 if (found) {
1473 return i;
1474 }
1475 }
1476 return -1; // bootstrap specifier not found; return unused index (-1)
1477 } // end find_matching_operand()
1478
1479
1480 #ifndef PRODUCT
1481
1482 const char* ConstantPool::printable_name_at(int which) {
1483
1484 constantTag tag = tag_at(which);
1485
1486 if (tag.is_string()) {
1487 return string_at_noresolve(which);
1488 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1489 return klass_name_at(which)->as_C_string();
1490 } else if (tag.is_symbol()) {
1491 return symbol_at(which)->as_C_string();
1492 }
1493 return "";
1494 }
1495
1496 #endif // PRODUCT
1497
1498
1499 // JVMTI GetConstantPool support
1500
1501 // For debugging of constant pool
1502 const bool debug_cpool = false;
1503
1504 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1505
1506 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1507 const char* WARN_MSG = "Must not be such entry!";
1508 jint size = 0;
1509 u2 idx1, idx2;
1510
1511 for (jint idx = 1; idx < cnt; idx++) {
1512 jint ent_size = 0;
1513 u1 tag = *bytes++;
1514 size++; // count tag
1515
1516 printf("const #%03d, tag: %02d ", idx, tag);
1517 switch(tag) {
1518 case JVM_CONSTANT_Invalid: {
1519 printf("Invalid");
1520 break;
1521 }
1522 case JVM_CONSTANT_Unicode: {
1523 printf("Unicode %s", WARN_MSG);
1524 break;
1525 }
1526 case JVM_CONSTANT_Utf8: {
1527 u2 len = Bytes::get_Java_u2(bytes);
1528 char str[128];
1529 if (len > 127) {
1530 len = 127;
1531 }
1532 strncpy(str, (char *) (bytes+2), len);
1533 str[len] = '\0';
1534 printf("Utf8 \"%s\"", str);
1535 ent_size = 2 + len;
1536 break;
1537 }
1538 case JVM_CONSTANT_Integer: {
1539 u4 val = Bytes::get_Java_u4(bytes);
1540 printf("int %d", *(int *) &val);
1541 ent_size = 4;
1542 break;
1543 }
1544 case JVM_CONSTANT_Float: {
1545 u4 val = Bytes::get_Java_u4(bytes);
1546 printf("float %5.3ff", *(float *) &val);
1547 ent_size = 4;
1548 break;
1549 }
1550 case JVM_CONSTANT_Long: {
1551 u8 val = Bytes::get_Java_u8(bytes);
1552 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1553 ent_size = 8;
1554 idx++; // Long takes two cpool slots
1555 break;
1556 }
1557 case JVM_CONSTANT_Double: {
1558 u8 val = Bytes::get_Java_u8(bytes);
1559 printf("double %5.3fd", *(jdouble *)&val);
1560 ent_size = 8;
1561 idx++; // Double takes two cpool slots
1562 break;
1563 }
1564 case JVM_CONSTANT_Class: {
1565 idx1 = Bytes::get_Java_u2(bytes);
1566 printf("class #%03d", idx1);
1567 ent_size = 2;
1568 break;
1569 }
1570 case JVM_CONSTANT_String: {
1571 idx1 = Bytes::get_Java_u2(bytes);
1572 printf("String #%03d", idx1);
1573 ent_size = 2;
1574 break;
1575 }
1576 case JVM_CONSTANT_Fieldref: {
1577 idx1 = Bytes::get_Java_u2(bytes);
1578 idx2 = Bytes::get_Java_u2(bytes+2);
1579 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1580 ent_size = 4;
1581 break;
1582 }
1583 case JVM_CONSTANT_Methodref: {
1584 idx1 = Bytes::get_Java_u2(bytes);
1585 idx2 = Bytes::get_Java_u2(bytes+2);
1586 printf("Method #%03d, #%03d", idx1, idx2);
1587 ent_size = 4;
1588 break;
1589 }
1590 case JVM_CONSTANT_InterfaceMethodref: {
1591 idx1 = Bytes::get_Java_u2(bytes);
1592 idx2 = Bytes::get_Java_u2(bytes+2);
1593 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1594 ent_size = 4;
1595 break;
1596 }
1597 case JVM_CONSTANT_NameAndType: {
1598 idx1 = Bytes::get_Java_u2(bytes);
1599 idx2 = Bytes::get_Java_u2(bytes+2);
1600 printf("NameAndType #%03d, #%03d", idx1, idx2);
1601 ent_size = 4;
1602 break;
1603 }
1604 case JVM_CONSTANT_ClassIndex: {
1605 printf("ClassIndex %s", WARN_MSG);
1606 break;
1607 }
1608 case JVM_CONSTANT_UnresolvedClass: {
1609 printf("UnresolvedClass: %s", WARN_MSG);
1610 break;
1611 }
1612 case JVM_CONSTANT_UnresolvedClassInError: {
1613 printf("UnresolvedClassInErr: %s", WARN_MSG);
1614 break;
1615 }
1616 case JVM_CONSTANT_StringIndex: {
1617 printf("StringIndex: %s", WARN_MSG);
1618 break;
1619 }
1620 }
1621 printf(";\n");
1622 bytes += ent_size;
1623 size += ent_size;
1624 }
1625 printf("Cpool size: %d\n", size);
1626 fflush(0);
1627 return;
1628 } /* end print_cpool_bytes */
1629
1630
1631 // Returns size of constant pool entry.
1632 jint ConstantPool::cpool_entry_size(jint idx) {
1633 switch(tag_at(idx).value()) {
1634 case JVM_CONSTANT_Invalid:
1635 case JVM_CONSTANT_Unicode:
1636 return 1;
1637
1638 case JVM_CONSTANT_Utf8:
1639 return 3 + symbol_at(idx)->utf8_length();
1640
1641 case JVM_CONSTANT_Class:
1642 case JVM_CONSTANT_String:
1643 case JVM_CONSTANT_ClassIndex:
1644 case JVM_CONSTANT_UnresolvedClass:
1645 case JVM_CONSTANT_UnresolvedClassInError:
1646 case JVM_CONSTANT_StringIndex:
1647 case JVM_CONSTANT_MethodType:
1648 return 3;
1649
1650 case JVM_CONSTANT_MethodHandle:
1651 return 4; //tag, ref_kind, ref_index
1652
1653 case JVM_CONSTANT_Integer:
1654 case JVM_CONSTANT_Float:
1655 case JVM_CONSTANT_Fieldref:
1656 case JVM_CONSTANT_Methodref:
1657 case JVM_CONSTANT_InterfaceMethodref:
1658 case JVM_CONSTANT_NameAndType:
1659 return 5;
1660
1661 case JVM_CONSTANT_InvokeDynamic:
1662 // u1 tag, u2 bsm, u2 nt
1663 return 5;
1664
1665 case JVM_CONSTANT_Long:
1666 case JVM_CONSTANT_Double:
1667 return 9;
1668 }
1669 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1670 return 1;
1671 } /* end cpool_entry_size */
1672
1673
1674 // SymbolHashMap is used to find a constant pool index from a string.
1675 // This function fills in SymbolHashMaps, one for utf8s and one for
1676 // class names, returns size of the cpool raw bytes.
1677 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1678 SymbolHashMap *classmap) {
1679 jint size = 0;
1680
1681 for (u2 idx = 1; idx < length(); idx++) {
1682 u2 tag = tag_at(idx).value();
1683 size += cpool_entry_size(idx);
1684
1685 switch(tag) {
1686 case JVM_CONSTANT_Utf8: {
1687 Symbol* sym = symbol_at(idx);
1688 symmap->add_entry(sym, idx);
1689 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1690 break;
1691 }
1692 case JVM_CONSTANT_Class:
1693 case JVM_CONSTANT_UnresolvedClass:
1694 case JVM_CONSTANT_UnresolvedClassInError: {
1695 Symbol* sym = klass_name_at(idx);
1696 classmap->add_entry(sym, idx);
1697 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1698 break;
1699 }
1700 case JVM_CONSTANT_Long:
1701 case JVM_CONSTANT_Double: {
1702 idx++; // Both Long and Double take two cpool slots
1703 break;
1704 }
1705 }
1706 }
1707 return size;
1708 } /* end hash_utf8_entries_to */
1709
1710
1711 // Copy cpool bytes.
1712 // Returns:
1713 // 0, in case of OutOfMemoryError
1714 // -1, in case of internal error
1715 // > 0, count of the raw cpool bytes that have been copied
1716 int ConstantPool::copy_cpool_bytes(int cpool_size,
1717 SymbolHashMap* tbl,
1718 unsigned char *bytes) {
1719 u2 idx1, idx2;
1720 jint size = 0;
1721 jint cnt = length();
1722 unsigned char *start_bytes = bytes;
1723
1724 for (jint idx = 1; idx < cnt; idx++) {
1725 u1 tag = tag_at(idx).value();
1726 jint ent_size = cpool_entry_size(idx);
1727
1728 assert(size + ent_size <= cpool_size, "Size mismatch");
1729
1730 *bytes = tag;
1731 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1732 switch(tag) {
1733 case JVM_CONSTANT_Invalid: {
1734 DBG(printf("JVM_CONSTANT_Invalid"));
1735 break;
1736 }
1737 case JVM_CONSTANT_Unicode: {
1738 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1739 DBG(printf("JVM_CONSTANT_Unicode"));
1740 break;
1741 }
1742 case JVM_CONSTANT_Utf8: {
1743 Symbol* sym = symbol_at(idx);
1744 char* str = sym->as_utf8();
1745 // Warning! It's crashing on x86 with len = sym->utf8_length()
1746 int len = (int) strlen(str);
1747 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1748 for (int i = 0; i < len; i++) {
1749 bytes[3+i] = (u1) str[i];
1750 }
1751 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1752 break;
1753 }
1754 case JVM_CONSTANT_Integer: {
1755 jint val = int_at(idx);
1756 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1757 break;
1758 }
1759 case JVM_CONSTANT_Float: {
1760 jfloat val = float_at(idx);
1761 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1762 break;
1763 }
1764 case JVM_CONSTANT_Long: {
1765 jlong val = long_at(idx);
1766 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1767 idx++; // Long takes two cpool slots
1768 break;
1769 }
1770 case JVM_CONSTANT_Double: {
1771 jdouble val = double_at(idx);
1772 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1773 idx++; // Double takes two cpool slots
1774 break;
1775 }
1776 case JVM_CONSTANT_Class:
1777 case JVM_CONSTANT_UnresolvedClass:
1778 case JVM_CONSTANT_UnresolvedClassInError: {
1779 *bytes = JVM_CONSTANT_Class;
1780 Symbol* sym = klass_name_at(idx);
1781 idx1 = tbl->symbol_to_value(sym);
1782 assert(idx1 != 0, "Have not found a hashtable entry");
1783 Bytes::put_Java_u2((address) (bytes+1), idx1);
1784 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1785 break;
1786 }
1787 case JVM_CONSTANT_String: {
1788 *bytes = JVM_CONSTANT_String;
1789 Symbol* sym = unresolved_string_at(idx);
1790 idx1 = tbl->symbol_to_value(sym);
1791 assert(idx1 != 0, "Have not found a hashtable entry");
1792 Bytes::put_Java_u2((address) (bytes+1), idx1);
1793 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1794 break;
1795 }
1796 case JVM_CONSTANT_Fieldref:
1797 case JVM_CONSTANT_Methodref:
1798 case JVM_CONSTANT_InterfaceMethodref: {
1799 idx1 = uncached_klass_ref_index_at(idx);
1800 idx2 = uncached_name_and_type_ref_index_at(idx);
1801 Bytes::put_Java_u2((address) (bytes+1), idx1);
1802 Bytes::put_Java_u2((address) (bytes+3), idx2);
1803 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1804 break;
1805 }
1806 case JVM_CONSTANT_NameAndType: {
1807 idx1 = name_ref_index_at(idx);
1808 idx2 = signature_ref_index_at(idx);
1809 Bytes::put_Java_u2((address) (bytes+1), idx1);
1810 Bytes::put_Java_u2((address) (bytes+3), idx2);
1811 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1812 break;
1813 }
1814 case JVM_CONSTANT_ClassIndex: {
1815 *bytes = JVM_CONSTANT_Class;
1816 idx1 = klass_index_at(idx);
1817 Bytes::put_Java_u2((address) (bytes+1), idx1);
1818 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1819 break;
1820 }
1821 case JVM_CONSTANT_StringIndex: {
1822 *bytes = JVM_CONSTANT_String;
1823 idx1 = string_index_at(idx);
1824 Bytes::put_Java_u2((address) (bytes+1), idx1);
1825 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1826 break;
1827 }
1828 case JVM_CONSTANT_MethodHandle:
1829 case JVM_CONSTANT_MethodHandleInError: {
1830 *bytes = JVM_CONSTANT_MethodHandle;
1831 int kind = method_handle_ref_kind_at(idx);
1832 idx1 = method_handle_index_at(idx);
1833 *(bytes+1) = (unsigned char) kind;
1834 Bytes::put_Java_u2((address) (bytes+2), idx1);
1835 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1836 break;
1837 }
1838 case JVM_CONSTANT_MethodType:
1839 case JVM_CONSTANT_MethodTypeInError: {
1840 *bytes = JVM_CONSTANT_MethodType;
1841 idx1 = method_type_index_at(idx);
1842 Bytes::put_Java_u2((address) (bytes+1), idx1);
1843 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1844 break;
1845 }
1846 case JVM_CONSTANT_InvokeDynamic: {
1847 *bytes = tag;
1848 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1849 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1850 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1851 Bytes::put_Java_u2((address) (bytes+1), idx1);
1852 Bytes::put_Java_u2((address) (bytes+3), idx2);
1853 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1854 break;
1855 }
1856 }
1857 DBG(printf("\n"));
1858 bytes += ent_size;
1859 size += ent_size;
1860 }
1861 assert(size == cpool_size, "Size mismatch");
1862
1863 // Keep temorarily for debugging until it's stable.
1864 DBG(print_cpool_bytes(cnt, start_bytes));
1865 return (int)(bytes - start_bytes);
1866 } /* end copy_cpool_bytes */
1867
1868 #undef DBG
1869
1870
1871 void ConstantPool::set_on_stack(const bool value) {
1872 if (value) {
1873 _flags |= _on_stack;
1874 } else {
1875 _flags &= ~_on_stack;
1876 }
1877 if (value) MetadataOnStackMark::record(this);
1878 }
1879
1880 // JSR 292 support for patching constant pool oops after the class is linked and
1881 // the oop array for resolved references are created.
1882 // We can't do this during classfile parsing, which is how the other indexes are
1883 // patched. The other patches are applied early for some error checking
1884 // so only defer the pseudo_strings.
1885 void ConstantPool::patch_resolved_references(
1886 GrowableArray<Handle>* cp_patches) {
1887 assert(EnableInvokeDynamic, "");
1888 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1889 Handle patch = cp_patches->at(index);
1890 if (patch.not_null()) {
1891 assert (tag_at(index).is_string(), "should only be string left");
1892 // Patching a string means pre-resolving it.
1893 // The spelling in the constant pool is ignored.
1894 // The constant reference may be any object whatever.
1895 // If it is not a real interned string, the constant is referred
1896 // to as a "pseudo-string", and must be presented to the CP
1897 // explicitly, because it may require scavenging.
1898 int obj_index = cp_to_object_index(index);
1899 pseudo_string_at_put(index, obj_index, patch());
1900 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1901 }
1902 }
1903 #ifdef ASSERT
1904 // Ensure that all the patches have been used.
1905 for (int index = 0; index < cp_patches->length(); index++) {
1906 assert(cp_patches->at(index).is_null(),
1907 err_msg("Unused constant pool patch at %d in class file %s",
1908 index,
1909 pool_holder()->external_name()));
1910 }
1911 #endif // ASSERT
1912 }
1913
1914 #ifndef PRODUCT
1915
1916 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1917 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1918 guarantee(obj->is_constantPool(), "object must be constant pool");
1919 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1920 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1921
1922 for (int i = 0; i< cp->length(); i++) {
1923 if (cp->tag_at(i).is_unresolved_klass()) {
1924 // This will force loading of the class
1925 Klass* klass = cp->klass_at(i, CHECK);
1926 if (klass->oop_is_instance()) {
1927 // Force initialization of class
1928 InstanceKlass::cast(klass)->initialize(CHECK);
1929 }
1930 }
1931 }
1932 }
1933
1934 #endif
1935
1936
1937 // Printing
1938
1939 void ConstantPool::print_on(outputStream* st) const {
1940 EXCEPTION_MARK;
1941 assert(is_constantPool(), "must be constantPool");
1942 st->print_cr(internal_name());
1943 if (flags() != 0) {
1944 st->print(" - flags: 0x%x", flags());
1945 if (has_preresolution()) st->print(" has_preresolution");
1946 if (on_stack()) st->print(" on_stack");
1947 st->cr();
1948 }
1949 if (pool_holder() != NULL) {
1950 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
1951 }
1952 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
1953 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references());
1954 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
1955
1956 for (int index = 1; index < length(); index++) { // Index 0 is unused
1957 ((ConstantPool*)this)->print_entry_on(index, st);
1958 switch (tag_at(index).value()) {
1959 case JVM_CONSTANT_Long :
1960 case JVM_CONSTANT_Double :
1961 index++; // Skip entry following eigth-byte constant
1962 }
1963
1964 }
1965 st->cr();
1966 }
1967
1968 // Print one constant pool entry
1969 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1970 EXCEPTION_MARK;
1971 st->print(" - %3d : ", index);
1972 tag_at(index).print_on(st);
1973 st->print(" : ");
1974 switch (tag_at(index).value()) {
1975 case JVM_CONSTANT_Class :
1976 { Klass* k = klass_at(index, CATCH);
1977 guarantee(k != NULL, "need klass");
1978 k->print_value_on(st);
1979 st->print(" {0x%lx}", (address)k);
1980 }
1981 break;
1982 case JVM_CONSTANT_Fieldref :
1983 case JVM_CONSTANT_Methodref :
1984 case JVM_CONSTANT_InterfaceMethodref :
1985 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1986 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1987 break;
1988 case JVM_CONSTANT_String :
1989 if (is_pseudo_string_at(index)) {
1990 oop anObj = pseudo_string_at(index);
1991 anObj->print_value_on(st);
1992 st->print(" {0x%lx}", (address)anObj);
1993 } else {
1994 unresolved_string_at(index)->print_value_on(st);
1995 }
1996 break;
1997 case JVM_CONSTANT_Integer :
1998 st->print("%d", int_at(index));
1999 break;
2000 case JVM_CONSTANT_Float :
2001 st->print("%f", float_at(index));
2002 break;
2003 case JVM_CONSTANT_Long :
2004 st->print_jlong(long_at(index));
2005 break;
2006 case JVM_CONSTANT_Double :
2007 st->print("%lf", double_at(index));
2008 break;
2009 case JVM_CONSTANT_NameAndType :
2010 st->print("name_index=%d", name_ref_index_at(index));
2011 st->print(" signature_index=%d", signature_ref_index_at(index));
2012 break;
2013 case JVM_CONSTANT_Utf8 :
2014 symbol_at(index)->print_value_on(st);
2015 break;
2016 case JVM_CONSTANT_UnresolvedClass : // fall-through
2017 case JVM_CONSTANT_UnresolvedClassInError: {
2018 // unresolved_klass_at requires lock or safe world.
2019 CPSlot entry = slot_at(index);
2020 if (entry.is_resolved()) {
2021 entry.get_klass()->print_value_on(st);
2022 } else {
2023 entry.get_symbol()->print_value_on(st);
2024 }
2025 }
2026 break;
2027 case JVM_CONSTANT_MethodHandle :
2028 case JVM_CONSTANT_MethodHandleInError :
2029 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2030 st->print(" ref_index=%d", method_handle_index_at(index));
2031 break;
2032 case JVM_CONSTANT_MethodType :
2033 case JVM_CONSTANT_MethodTypeInError :
2034 st->print("signature_index=%d", method_type_index_at(index));
2035 break;
2036 case JVM_CONSTANT_InvokeDynamic :
2037 {
2038 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
2039 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
2040 int argc = invoke_dynamic_argument_count_at(index);
2041 if (argc > 0) {
2042 for (int arg_i = 0; arg_i < argc; arg_i++) {
2043 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2044 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2045 }
2046 st->print("}");
2047 }
2048 }
2049 break;
2050 default:
2051 ShouldNotReachHere();
2052 break;
2053 }
2054 st->cr();
2055 }
2056
2057 void ConstantPool::print_value_on(outputStream* st) const {
2058 assert(is_constantPool(), "must be constantPool");
2059 st->print("constant pool [%d]", length());
2060 if (has_preresolution()) st->print("/preresolution");
2061 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2062 print_address_on(st);
2063 st->print(" for ");
2064 pool_holder()->print_value_on(st);
2065 if (pool_holder() != NULL) {
2066 bool extra = (pool_holder()->constants() != this);
2067 if (extra) st->print(" (extra)");
2068 }
2069 if (cache() != NULL) {
2070 st->print(" cache=" PTR_FORMAT, cache());
2071 }
2072 }
2073
2074 #if INCLUDE_SERVICES
2075 // Size Statistics
2076 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2077 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2078 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2079 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2080 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2081 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2082
2083 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2084 sz->_cp_refmap_bytes;
2085 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2086 }
2087 #endif // INCLUDE_SERVICES
2088
2089 // Verification
2090
2091 void ConstantPool::verify_on(outputStream* st) {
2092 guarantee(is_constantPool(), "object must be constant pool");
2093 for (int i = 0; i< length(); i++) {
2094 constantTag tag = tag_at(i);
2095 CPSlot entry = slot_at(i);
2096 if (tag.is_klass()) {
2097 if (entry.is_resolved()) {
2098 guarantee(entry.get_klass()->is_klass(), "should be klass");
2099 }
2100 } else if (tag.is_unresolved_klass()) {
2101 if (entry.is_resolved()) {
2102 guarantee(entry.get_klass()->is_klass(), "should be klass");
2103 }
2104 } else if (tag.is_symbol()) {
2105 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2106 } else if (tag.is_string()) {
2107 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2108 }
2109 }
2110 if (cache() != NULL) {
2111 // Note: cache() can be NULL before a class is completely setup or
2112 // in temporary constant pools used during constant pool merging
2113 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2114 }
2115 if (pool_holder() != NULL) {
2116 // Note: pool_holder() can be NULL in temporary constant pools
2117 // used during constant pool merging
2118 guarantee(pool_holder()->is_klass(), "should be klass");
2119 }
2120 }
2121
2122
2123 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2124 char *str = sym->as_utf8();
2125 unsigned int hash = compute_hash(str, sym->utf8_length());
2126 unsigned int index = hash % table_size();
2127
2128 // check if already in map
2129 // we prefer the first entry since it is more likely to be what was used in
2130 // the class file
2131 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2132 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2133 if (en->hash() == hash && en->symbol() == sym) {
2134 return; // already there
2135 }
2136 }
2137
2138 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2139 entry->set_next(bucket(index));
2140 _buckets[index].set_entry(entry);
2141 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2142 }
2143
2144 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2145 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2146 char *str = sym->as_utf8();
2147 int len = sym->utf8_length();
2148 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2149 unsigned int index = hash % table_size();
2150 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2151 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2152 if (en->hash() == hash && en->symbol() == sym) {
2153 return en;
2154 }
2155 }
2156 return NULL;
2157 }