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