1 /*
2 * Copyright (c) 1997, 2012, 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/symbolTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "memory/metadataFactory.hpp"
33 #include "memory/oopFactory.hpp"
34 #include "oops/constantPool.hpp"
35 #include "oops/instanceKlass.hpp"
36 #include "oops/objArrayKlass.hpp"
37 #include "prims/jvmtiRedefineClasses.hpp"
38 #include "runtime/fieldType.hpp"
39 #include "runtime/init.hpp"
40 #include "runtime/javaCalls.hpp"
41 #include "runtime/signature.hpp"
42 #include "runtime/vframe.hpp"
43
44 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
45 // Tags are RW but comment below applies to tags also.
46 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
47
48 int size = ConstantPool::size(length);
49
50 // CDS considerations:
51 // Allocate read-write but may be able to move to read-only at dumping time
52 // if all the klasses are resolved. The only other field that is writable is
53 // the resolved_references array, which is recreated at startup time.
54 // But that could be moved to InstanceKlass (although a pain to access from
55 // assembly code). Maybe it could be moved to the cpCache which is RW.
56 return new (loader_data, size, false, THREAD) ConstantPool(tags);
57 }
58
59 ConstantPool::ConstantPool(Array<u1>* tags) {
60 set_length(tags->length());
61 set_tags(NULL);
62 set_cache(NULL);
63 set_reference_map(NULL);
64 set_resolved_references(NULL);
65 set_operands(NULL);
66 set_pool_holder(NULL);
67 set_flags(0);
68 // only set to non-zero if constant pool is merged by RedefineClasses
69 set_orig_length(0);
70 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
71 // all fields are initialized; needed for GC
72 set_on_stack(false);
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 void ConstantPool::set_flag_at(FlagBit fb) {
104 const int MAX_STATE_CHANGES = 2;
105 for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) {
106 int oflags = _flags;
107 int nflags = oflags | (1 << (int)fb);
108 if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags)
109 return;
110 }
111 assert(false, "failed to cmpxchg flags");
112 _flags |= (1 << (int)fb); // better than nothing
113 }
114
115 objArrayOop ConstantPool::resolved_references() const {
116 return (objArrayOop)JNIHandles::resolve(_resolved_references);
117 }
118
119 // Create resolved_references array and mapping array for original cp indexes
120 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
121 // to map it back for resolving and some unlikely miscellaneous uses.
122 // The objects created by invokedynamic are appended to this list.
123 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
124 intStack reference_map,
125 int constant_pool_map_length,
126 TRAPS) {
127 // Initialized the resolved object cache.
128 int map_length = reference_map.length();
129 if (map_length > 0) {
130 // Only need mapping back to constant pool entries. The map isn't used for
131 // invokedynamic resolved_reference entries. The constant pool cache index
132 // has the mapping back to both the constant pool and to the resolved
133 // reference index.
134 if (constant_pool_map_length > 0) {
135 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK);
136
137 for (int i = 0; i < constant_pool_map_length; i++) {
138 int x = reference_map.at(i);
139 assert(x == (int)(jushort) x, "klass index is too big");
140 om->at_put(i, (jushort)x);
141 }
142 set_reference_map(om);
143 }
144
145 // Create Java array for holding resolved strings, methodHandles,
146 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
147 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
148 Handle refs_handle (THREAD, (oop)stom); // must handleize.
149 set_resolved_references(loader_data->add_handle(refs_handle));
150 }
151 }
152
153 // CDS support. Create a new resolved_references array.
154 void ConstantPool::restore_unshareable_info(TRAPS) {
155
156 // restore the C++ vtable from the shared archive
157 restore_vtable();
158
159 if (SystemDictionary::Object_klass_loaded()) {
160 // Recreate the object array and add to ClassLoaderData.
161 int map_length = resolved_reference_length();
162 if (map_length > 0) {
163 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
164 Handle refs_handle (THREAD, (oop)stom); // must handleize.
165
166 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
167 set_resolved_references(loader_data->add_handle(refs_handle));
168 }
169
170 // Also need to recreate the mutex. Make sure this matches the constructor
171 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
172 }
173 }
174
175 void ConstantPool::remove_unshareable_info() {
176 // Resolved references are not in the shared archive.
177 // Save the length for restoration. It is not necessarily the same length
178 // as reference_map.length() if invokedynamic is saved.
179 set_resolved_reference_length(
180 resolved_references() != NULL ? resolved_references()->length() : 0);
181 set_resolved_references(NULL);
182 set_lock(NULL);
183 }
184
185 int ConstantPool::cp_to_object_index(int cp_index) {
186 // this is harder don't do this so much.
187 for (int i = 0; i< reference_map()->length(); i++) {
188 if (reference_map()->at(i) == cp_index) return i;
189 // Zero entry is divider between constant pool indices for strings,
190 // method handles and method types. After that the index is a constant
191 // pool cache index for invokedynamic. Stop when zero (which can never
192 // be a constant pool index)
193 if (reference_map()->at(i) == 0) break;
194 }
195 // We might not find the index.
196 return _no_index_sentinel;
197 }
198
199 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
200 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
201 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
202 // tag is not updated atomicly.
203
204 CPSlot entry = this_oop->slot_at(which);
205 if (entry.is_resolved()) {
206 assert(entry.get_klass()->is_klass(), "must be");
207 // Already resolved - return entry.
208 return entry.get_klass();
209 }
210
211 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
212 // already has updated the object
213 assert(THREAD->is_Java_thread(), "must be a Java thread");
214 bool do_resolve = false;
215 bool in_error = false;
216
217 // Create a handle for the mirror. This will preserve the resolved class
218 // until the loader_data is registered.
219 Handle mirror_handle;
220
221 Symbol* name = NULL;
222 Handle loader;
223 { MonitorLockerEx ml(this_oop->lock());
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 MonitorLockerEx ml(this_oop->lock());
271
272 // some other thread has beaten us and has resolved the class.
273 if (this_oop->tag_at(which).is_klass()) {
274 CLEAR_PENDING_EXCEPTION;
275 entry = this_oop->resolved_klass_at(which);
276 return entry.get_klass();
277 }
278
279 if (!PENDING_EXCEPTION->
280 is_a(SystemDictionary::LinkageError_klass())) {
281 // Just throw the exception and don't prevent these classes from
282 // being loaded due to virtual machine errors like StackOverflow
283 // and OutOfMemoryError, etc, or if the thread was hit by stop()
284 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
285 }
286 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
287 SystemDictionary::add_resolution_error(this_oop, which, error);
288 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
289 } else {
290 // some other thread has put the class in error state.
291 error = SystemDictionary::find_resolution_error(this_oop, which);
292 assert(error != NULL, "checking");
293 throw_orig_error = true;
294 }
295 } // unlocked
296
297 if (throw_orig_error) {
298 CLEAR_PENDING_EXCEPTION;
299 ResourceMark rm;
300 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
301 THROW_MSG_0(error, className);
302 }
303
304 return 0;
305 }
306
307 if (TraceClassResolution && !k()->oop_is_array()) {
308 // skip resolving the constant pool so that this code get's
309 // called the next time some bytecodes refer to this class.
310 ResourceMark rm;
311 int line_number = -1;
312 const char * source_file = NULL;
313 if (JavaThread::current()->has_last_Java_frame()) {
314 // try to identify the method which called this function.
315 vframeStream vfst(JavaThread::current());
316 if (!vfst.at_end()) {
317 line_number = vfst.method()->line_number_from_bci(vfst.bci());
318 Symbol* s = vfst.method()->method_holder()->source_file_name();
319 if (s != NULL) {
320 source_file = s->as_C_string();
321 }
322 }
323 }
324 if (k() != this_oop->pool_holder()) {
325 // only print something if the classes are different
326 if (source_file != NULL) {
327 tty->print("RESOLVE %s %s %s:%d\n",
328 this_oop->pool_holder()->external_name(),
329 InstanceKlass::cast(k())->external_name(), source_file, line_number);
330 } else {
331 tty->print("RESOLVE %s %s\n",
332 this_oop->pool_holder()->external_name(),
333 InstanceKlass::cast(k())->external_name());
334 }
335 }
336 return k();
337 } else {
338 MonitorLockerEx ml(this_oop->lock());
339 // Only updated constant pool - if it is resolved.
340 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
341 if (do_resolve) {
342 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data();
343 if (!this_key->is_the_null_class_loader_data()) {
344 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
345 }
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 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag.
637
638 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
639 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
640
641 if (!PENDING_EXCEPTION->
642 is_a(SystemDictionary::LinkageError_klass())) {
643 // Just throw the exception and don't prevent these classes from
644 // being loaded due to virtual machine errors like StackOverflow
645 // and OutOfMemoryError, etc, or if the thread was hit by stop()
646 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
647
648 } else if (this_oop->tag_at(which).value() != error_tag) {
649 SystemDictionary::add_resolution_error(this_oop, which, error);
650 this_oop->tag_at_put(which, error_tag);
651 } else {
652 // some other thread has put the class in error state.
653 error = SystemDictionary::find_resolution_error(this_oop, which);
654 assert(error != NULL, "checking");
655 CLEAR_PENDING_EXCEPTION;
656 THROW_MSG(error, "");
657 }
658 }
659
660
661 // Called to resolve constants in the constant pool and return an oop.
662 // Some constant pool entries cache their resolved oop. This is also
663 // called to create oops from constants to use in arguments for invokedynamic
664 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
665 oop result_oop = NULL;
666 Handle throw_exception;
667
668 if (cache_index == _possible_index_sentinel) {
669 // It is possible that this constant is one which is cached in the objects.
670 // We'll do a linear search. This should be OK because this usage is rare.
671 assert(index > 0, "valid index");
672 cache_index = this_oop->cp_to_object_index(index);
673 }
674 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
675 assert(index == _no_index_sentinel || index >= 0, "");
676
677 if (cache_index >= 0) {
678 result_oop = this_oop->resolved_references()->obj_at(cache_index);
679 if (result_oop != NULL) {
680 return result_oop;
681 // That was easy...
682 }
683 index = this_oop->object_to_cp_index(cache_index);
684 }
685
686 jvalue prim_value; // temp used only in a few cases below
687
688 int tag_value = this_oop->tag_at(index).value();
689
690 switch (tag_value) {
691
692 case JVM_CONSTANT_UnresolvedClass:
693 case JVM_CONSTANT_UnresolvedClassInError:
694 case JVM_CONSTANT_Class:
695 {
696 assert(cache_index == _no_index_sentinel, "should not have been set");
697 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
698 // ldc wants the java mirror.
699 result_oop = resolved->java_mirror();
700 break;
701 }
702
703 case JVM_CONSTANT_String:
704 assert(cache_index != _no_index_sentinel, "should have been set");
705 if (this_oop->is_pseudo_string_at(index)) {
706 result_oop = this_oop->pseudo_string_at(index, cache_index);
707 break;
708 }
709 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
710 break;
711
712 case JVM_CONSTANT_Object:
713 result_oop = this_oop->object_at(index);
714 break;
715
716 case JVM_CONSTANT_MethodHandleInError:
717 case JVM_CONSTANT_MethodTypeInError:
718 {
719 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
720 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
721 ResourceMark rm;
722 THROW_MSG_0(error, "");
723 break;
724 }
725
726 case JVM_CONSTANT_MethodHandle:
727 {
728 int ref_kind = this_oop->method_handle_ref_kind_at(index);
729 int callee_index = this_oop->method_handle_klass_index_at(index);
730 Symbol* name = this_oop->method_handle_name_ref_at(index);
731 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
732 if (PrintMiscellaneous)
733 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
734 ref_kind, index, this_oop->method_handle_index_at(index),
735 callee_index, name->as_C_string(), signature->as_C_string());
736 KlassHandle callee;
737 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
738 callee = KlassHandle(THREAD, k);
739 }
740 KlassHandle klass(THREAD, this_oop->pool_holder());
741 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
742 callee, name, signature,
743 THREAD);
744 result_oop = value();
745 if (HAS_PENDING_EXCEPTION) {
746 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
747 }
748 break;
749 }
750
751 case JVM_CONSTANT_MethodType:
752 {
753 Symbol* signature = this_oop->method_type_signature_at(index);
754 if (PrintMiscellaneous)
755 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
756 index, this_oop->method_type_index_at(index),
757 signature->as_C_string());
758 KlassHandle klass(THREAD, this_oop->pool_holder());
759 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
760 result_oop = value();
761 if (HAS_PENDING_EXCEPTION) {
762 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
763 }
764 break;
765 }
766
767 case JVM_CONSTANT_Integer:
768 assert(cache_index == _no_index_sentinel, "should not have been set");
769 prim_value.i = this_oop->int_at(index);
770 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
771 break;
772
773 case JVM_CONSTANT_Float:
774 assert(cache_index == _no_index_sentinel, "should not have been set");
775 prim_value.f = this_oop->float_at(index);
776 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
777 break;
778
779 case JVM_CONSTANT_Long:
780 assert(cache_index == _no_index_sentinel, "should not have been set");
781 prim_value.j = this_oop->long_at(index);
782 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
783 break;
784
785 case JVM_CONSTANT_Double:
786 assert(cache_index == _no_index_sentinel, "should not have been set");
787 prim_value.d = this_oop->double_at(index);
788 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
789 break;
790
791 default:
792 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
793 this_oop(), index, cache_index, tag_value) );
794 assert(false, "unexpected constant tag");
795 break;
796 }
797
798 if (cache_index >= 0) {
799 // Cache the oop here also.
800 Handle result_handle(THREAD, result_oop);
801 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this
802 oop result = this_oop->resolved_references()->obj_at(cache_index);
803 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
804 // The important thing here is that all threads pick up the same result.
805 // It doesn't matter which racing thread wins, as long as only one
806 // result is used by all threads, and all future queries.
807 // That result may be either a resolved constant or a failure exception.
808 if (result == NULL) {
809 this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
810 return result_handle();
811 } else {
812 // Return the winning thread's result. This can be different than
813 // result_handle() for MethodHandles.
814 return result;
815 }
816 } else {
817 return result_oop;
818 }
819 }
820
821 oop ConstantPool::uncached_string_at(int which, TRAPS) {
822 Symbol* sym = unresolved_string_at(which);
823 oop str = StringTable::intern(sym, CHECK_(NULL));
824 assert(java_lang_String::is_instance(str), "must be string");
825 return str;
826 }
827
828
829 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
830 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
831
832 Handle bsm;
833 int argc;
834 {
835 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
836 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
837 // It is accompanied by the optional arguments.
838 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
839 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
840 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
841 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
842 }
843
844 // Extract the optional static arguments.
845 argc = this_oop->invoke_dynamic_argument_count_at(index);
846 if (argc == 0) return bsm_oop;
847
848 bsm = Handle(THREAD, bsm_oop);
849 }
850
851 objArrayHandle info;
852 {
853 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
854 info = objArrayHandle(THREAD, info_oop);
855 }
856
857 info->obj_at_put(0, bsm());
858 for (int i = 0; i < argc; i++) {
859 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
860 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
861 info->obj_at_put(1+i, arg_oop);
862 }
863
864 return info();
865 }
866
867 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
868 // If the string has already been interned, this entry will be non-null
869 oop str = this_oop->resolved_references()->obj_at(obj_index);
870 if (str != NULL) return str;
871
872 Symbol* sym = this_oop->unresolved_string_at(which);
873 str = StringTable::intern(sym, CHECK_(NULL));
874 this_oop->string_at_put(which, obj_index, str);
875 assert(java_lang_String::is_instance(str), "must be string");
876 return str;
877 }
878
879
880 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
881 int which) {
882 // Names are interned, so we can compare Symbol*s directly
883 Symbol* cp_name = klass_name_at(which);
884 return (cp_name == k->name());
885 }
886
887
888 // Iterate over symbols and decrement ones which are Symbol*s.
889 // This is done during GC so do not need to lock constantPool unless we
890 // have per-thread safepoints.
891 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
892 // these symbols but didn't increment the reference count.
893 void ConstantPool::unreference_symbols() {
894 for (int index = 1; index < length(); index++) { // Index 0 is unused
895 constantTag tag = tag_at(index);
896 if (tag.is_symbol()) {
897 symbol_at(index)->decrement_refcount();
898 }
899 }
900 }
901
902
903 // Compare this constant pool's entry at index1 to the constant pool
904 // cp2's entry at index2.
905 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
906 int index2, TRAPS) {
907
908 jbyte t1 = tag_at(index1).value();
909 jbyte t2 = cp2->tag_at(index2).value();
910
911
912 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
913 // when comparing
914 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
915 t1 = JVM_CONSTANT_UnresolvedClass;
916 }
917 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
918 t2 = JVM_CONSTANT_UnresolvedClass;
919 }
920
921 if (t1 != t2) {
922 // Not the same entry type so there is nothing else to check. Note
923 // that this style of checking will consider resolved/unresolved
924 // class pairs as different.
925 // From the ConstantPool* API point of view, this is correct
926 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
927 // plays out in the context of ConstantPool* merging.
928 return false;
929 }
930
931 switch (t1) {
932 case JVM_CONSTANT_Class:
933 {
934 Klass* k1 = klass_at(index1, CHECK_false);
935 Klass* k2 = cp2->klass_at(index2, CHECK_false);
936 if (k1 == k2) {
937 return true;
938 }
939 } break;
940
941 case JVM_CONSTANT_ClassIndex:
942 {
943 int recur1 = klass_index_at(index1);
944 int recur2 = cp2->klass_index_at(index2);
945 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
946 if (match) {
947 return true;
948 }
949 } break;
950
951 case JVM_CONSTANT_Double:
952 {
953 jdouble d1 = double_at(index1);
954 jdouble d2 = cp2->double_at(index2);
955 if (d1 == d2) {
956 return true;
957 }
958 } break;
959
960 case JVM_CONSTANT_Fieldref:
961 case JVM_CONSTANT_InterfaceMethodref:
962 case JVM_CONSTANT_Methodref:
963 {
964 int recur1 = uncached_klass_ref_index_at(index1);
965 int recur2 = cp2->uncached_klass_ref_index_at(index2);
966 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
967 if (match) {
968 recur1 = uncached_name_and_type_ref_index_at(index1);
969 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
970 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
971 if (match) {
972 return true;
973 }
974 }
975 } break;
976
977 case JVM_CONSTANT_Float:
978 {
979 jfloat f1 = float_at(index1);
980 jfloat f2 = cp2->float_at(index2);
981 if (f1 == f2) {
982 return true;
983 }
984 } break;
985
986 case JVM_CONSTANT_Integer:
987 {
988 jint i1 = int_at(index1);
989 jint i2 = cp2->int_at(index2);
990 if (i1 == i2) {
991 return true;
992 }
993 } break;
994
995 case JVM_CONSTANT_Long:
996 {
997 jlong l1 = long_at(index1);
998 jlong l2 = cp2->long_at(index2);
999 if (l1 == l2) {
1000 return true;
1001 }
1002 } break;
1003
1004 case JVM_CONSTANT_NameAndType:
1005 {
1006 int recur1 = name_ref_index_at(index1);
1007 int recur2 = cp2->name_ref_index_at(index2);
1008 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1009 if (match) {
1010 recur1 = signature_ref_index_at(index1);
1011 recur2 = cp2->signature_ref_index_at(index2);
1012 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1013 if (match) {
1014 return true;
1015 }
1016 }
1017 } break;
1018
1019 case JVM_CONSTANT_StringIndex:
1020 {
1021 int recur1 = string_index_at(index1);
1022 int recur2 = cp2->string_index_at(index2);
1023 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1024 if (match) {
1025 return true;
1026 }
1027 } break;
1028
1029 case JVM_CONSTANT_UnresolvedClass:
1030 {
1031 Symbol* k1 = unresolved_klass_at(index1);
1032 Symbol* k2 = cp2->unresolved_klass_at(index2);
1033 if (k1 == k2) {
1034 return true;
1035 }
1036 } break;
1037
1038 case JVM_CONSTANT_MethodType:
1039 {
1040 int k1 = method_type_index_at(index1);
1041 int k2 = cp2->method_type_index_at(index2);
1042 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1043 if (match) {
1044 return true;
1045 }
1046 } break;
1047
1048 case JVM_CONSTANT_MethodHandle:
1049 {
1050 int k1 = method_handle_ref_kind_at(index1);
1051 int k2 = cp2->method_handle_ref_kind_at(index2);
1052 if (k1 == k2) {
1053 int i1 = method_handle_index_at(index1);
1054 int i2 = cp2->method_handle_index_at(index2);
1055 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1056 if (match) {
1057 return true;
1058 }
1059 }
1060 } break;
1061
1062 case JVM_CONSTANT_InvokeDynamic:
1063 {
1064 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
1065 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
1066 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1067 if (!match) return false;
1068 k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1069 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1070 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1071 if (!match) return false;
1072 int argc = invoke_dynamic_argument_count_at(index1);
1073 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) {
1074 for (int j = 0; j < argc; j++) {
1075 k1 = invoke_dynamic_argument_index_at(index1, j);
1076 k2 = cp2->invoke_dynamic_argument_index_at(index2, j);
1077 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1078 if (!match) return false;
1079 }
1080 return true; // got through loop; all elements equal
1081 }
1082 } break;
1083
1084 case JVM_CONSTANT_String:
1085 {
1086 Symbol* s1 = unresolved_string_at(index1);
1087 Symbol* s2 = cp2->unresolved_string_at(index2);
1088 if (s1 == s2) {
1089 return true;
1090 }
1091 } break;
1092
1093 case JVM_CONSTANT_Utf8:
1094 {
1095 Symbol* s1 = symbol_at(index1);
1096 Symbol* s2 = cp2->symbol_at(index2);
1097 if (s1 == s2) {
1098 return true;
1099 }
1100 } break;
1101
1102 // Invalid is used as the tag for the second constant pool entry
1103 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1104 // not be seen by itself.
1105 case JVM_CONSTANT_Invalid: // fall through
1106
1107 default:
1108 ShouldNotReachHere();
1109 break;
1110 }
1111
1112 return false;
1113 } // end compare_entry_to()
1114
1115
1116 // Copy this constant pool's entries at start_i to end_i (inclusive)
1117 // to the constant pool to_cp's entries starting at to_i. A total of
1118 // (end_i - start_i) + 1 entries are copied.
1119 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1120 constantPoolHandle to_cp, int to_i, TRAPS) {
1121
1122 int dest_i = to_i; // leave original alone for debug purposes
1123
1124 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1125 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1126
1127 switch (from_cp->tag_at(src_i).value()) {
1128 case JVM_CONSTANT_Double:
1129 case JVM_CONSTANT_Long:
1130 // double and long take two constant pool entries
1131 src_i += 2;
1132 dest_i += 2;
1133 break;
1134
1135 default:
1136 // all others take one constant pool entry
1137 src_i++;
1138 dest_i++;
1139 break;
1140 }
1141 }
1142
1143 int from_oplen = operand_array_length(from_cp->operands());
1144 int old_oplen = operand_array_length(to_cp->operands());
1145 if (from_oplen != 0) {
1146 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1147 // append my operands to the target's operands array
1148 if (old_oplen == 0) {
1149 // Can't just reuse from_cp's operand list because of deallocation issues
1150 int len = from_cp->operands()->length();
1151 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1152 Copy::conjoint_memory_atomic(
1153 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1154 to_cp->set_operands(new_ops);
1155 } else {
1156 int old_len = to_cp->operands()->length();
1157 int from_len = from_cp->operands()->length();
1158 int old_off = old_oplen * sizeof(u2);
1159 int from_off = from_oplen * sizeof(u2);
1160 // Use the metaspace for the destination constant pool
1161 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1162 int fillp = 0, len = 0;
1163 // first part of dest
1164 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1165 new_operands->adr_at(fillp),
1166 (len = old_off) * sizeof(u2));
1167 fillp += len;
1168 // first part of src
1169 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1170 new_operands->adr_at(fillp),
1171 (len = from_off) * sizeof(u2));
1172 fillp += len;
1173 // second part of dest
1174 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1175 new_operands->adr_at(fillp),
1176 (len = old_len - old_off) * sizeof(u2));
1177 fillp += len;
1178 // second part of src
1179 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(from_off),
1180 new_operands->adr_at(fillp),
1181 (len = from_len - from_off) * sizeof(u2));
1182 fillp += len;
1183 assert(fillp == new_operands->length(), "");
1184
1185 // Adjust indexes in the first part of the copied operands array.
1186 for (int j = 0; j < from_oplen; j++) {
1187 int offset = operand_offset_at(new_operands, old_oplen + j);
1188 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1189 offset += old_len; // every new tuple is preceded by old_len extra u2's
1190 operand_offset_at_put(new_operands, old_oplen + j, offset);
1191 }
1192
1193 // replace target operands array with combined array
1194 to_cp->set_operands(new_operands);
1195 }
1196 }
1197
1198 } // end copy_cp_to()
1199
1200
1201 // Copy this constant pool's entry at from_i to the constant pool
1202 // to_cp's entry at to_i.
1203 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1204 constantPoolHandle to_cp, int to_i,
1205 TRAPS) {
1206
1207 int tag = from_cp->tag_at(from_i).value();
1208 switch (tag) {
1209 case JVM_CONSTANT_Class:
1210 {
1211 Klass* k = from_cp->klass_at(from_i, CHECK);
1212 to_cp->klass_at_put(to_i, k);
1213 } break;
1214
1215 case JVM_CONSTANT_ClassIndex:
1216 {
1217 jint ki = from_cp->klass_index_at(from_i);
1218 to_cp->klass_index_at_put(to_i, ki);
1219 } break;
1220
1221 case JVM_CONSTANT_Double:
1222 {
1223 jdouble d = from_cp->double_at(from_i);
1224 to_cp->double_at_put(to_i, d);
1225 // double takes two constant pool entries so init second entry's tag
1226 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1227 } break;
1228
1229 case JVM_CONSTANT_Fieldref:
1230 {
1231 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1232 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1233 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1234 } break;
1235
1236 case JVM_CONSTANT_Float:
1237 {
1238 jfloat f = from_cp->float_at(from_i);
1239 to_cp->float_at_put(to_i, f);
1240 } break;
1241
1242 case JVM_CONSTANT_Integer:
1243 {
1244 jint i = from_cp->int_at(from_i);
1245 to_cp->int_at_put(to_i, i);
1246 } break;
1247
1248 case JVM_CONSTANT_InterfaceMethodref:
1249 {
1250 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1251 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1252 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1253 } break;
1254
1255 case JVM_CONSTANT_Long:
1256 {
1257 jlong l = from_cp->long_at(from_i);
1258 to_cp->long_at_put(to_i, l);
1259 // long takes two constant pool entries so init second entry's tag
1260 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1261 } break;
1262
1263 case JVM_CONSTANT_Methodref:
1264 {
1265 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1266 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1267 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1268 } break;
1269
1270 case JVM_CONSTANT_NameAndType:
1271 {
1272 int name_ref_index = from_cp->name_ref_index_at(from_i);
1273 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1274 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1275 } break;
1276
1277 case JVM_CONSTANT_StringIndex:
1278 {
1279 jint si = from_cp->string_index_at(from_i);
1280 to_cp->string_index_at_put(to_i, si);
1281 } break;
1282
1283 case JVM_CONSTANT_UnresolvedClass:
1284 {
1285 // Can be resolved after checking tag, so check the slot first.
1286 CPSlot entry = from_cp->slot_at(from_i);
1287 if (entry.is_resolved()) {
1288 assert(entry.get_klass()->is_klass(), "must be");
1289 // Already resolved
1290 to_cp->klass_at_put(to_i, entry.get_klass());
1291 } else {
1292 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1293 }
1294 } break;
1295
1296 case JVM_CONSTANT_UnresolvedClassInError:
1297 {
1298 Symbol* k = from_cp->unresolved_klass_at(from_i);
1299 to_cp->unresolved_klass_at_put(to_i, k);
1300 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1301 } break;
1302
1303
1304 case JVM_CONSTANT_String:
1305 {
1306 Symbol* s = from_cp->unresolved_string_at(from_i);
1307 to_cp->unresolved_string_at_put(to_i, s);
1308 } break;
1309
1310 case JVM_CONSTANT_Utf8:
1311 {
1312 Symbol* s = from_cp->symbol_at(from_i);
1313 // Need to increase refcount, the old one will be thrown away and deferenced
1314 s->increment_refcount();
1315 to_cp->symbol_at_put(to_i, s);
1316 } break;
1317
1318 case JVM_CONSTANT_MethodType:
1319 {
1320 jint k = from_cp->method_type_index_at(from_i);
1321 to_cp->method_type_index_at_put(to_i, k);
1322 } break;
1323
1324 case JVM_CONSTANT_MethodHandle:
1325 {
1326 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1327 int k2 = from_cp->method_handle_index_at(from_i);
1328 to_cp->method_handle_index_at_put(to_i, k1, k2);
1329 } break;
1330
1331 case JVM_CONSTANT_InvokeDynamic:
1332 {
1333 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1334 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1335 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1336 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1337 } break;
1338
1339 // Invalid is used as the tag for the second constant pool entry
1340 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1341 // not be seen by itself.
1342 case JVM_CONSTANT_Invalid: // fall through
1343
1344 default:
1345 {
1346 ShouldNotReachHere();
1347 } break;
1348 }
1349 } // end copy_entry_to()
1350
1351
1352 // Search constant pool search_cp for an entry that matches this
1353 // constant pool's entry at pattern_i. Returns the index of a
1354 // matching entry or zero (0) if there is no matching entry.
1355 int ConstantPool::find_matching_entry(int pattern_i,
1356 constantPoolHandle search_cp, TRAPS) {
1357
1358 // index zero (0) is not used
1359 for (int i = 1; i < search_cp->length(); i++) {
1360 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1361 if (found) {
1362 return i;
1363 }
1364 }
1365
1366 return 0; // entry not found; return unused index zero (0)
1367 } // end find_matching_entry()
1368
1369
1370 #ifndef PRODUCT
1371
1372 const char* ConstantPool::printable_name_at(int which) {
1373
1374 constantTag tag = tag_at(which);
1375
1376 if (tag.is_string()) {
1377 return string_at_noresolve(which);
1378 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1379 return klass_name_at(which)->as_C_string();
1380 } else if (tag.is_symbol()) {
1381 return symbol_at(which)->as_C_string();
1382 }
1383 return "";
1384 }
1385
1386 #endif // PRODUCT
1387
1388
1389 // JVMTI GetConstantPool support
1390
1391 // For temporary use until code is stable.
1392 #define DBG(code)
1393
1394 static const char* WARN_MSG = "Must not be such entry!";
1395
1396 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1397 jint size = 0;
1398 u2 idx1, idx2;
1399
1400 for (jint idx = 1; idx < cnt; idx++) {
1401 jint ent_size = 0;
1402 u1 tag = *bytes++;
1403 size++; // count tag
1404
1405 printf("const #%03d, tag: %02d ", idx, tag);
1406 switch(tag) {
1407 case JVM_CONSTANT_Invalid: {
1408 printf("Invalid");
1409 break;
1410 }
1411 case JVM_CONSTANT_Unicode: {
1412 printf("Unicode %s", WARN_MSG);
1413 break;
1414 }
1415 case JVM_CONSTANT_Utf8: {
1416 u2 len = Bytes::get_Java_u2(bytes);
1417 char str[128];
1418 if (len > 127) {
1419 len = 127;
1420 }
1421 strncpy(str, (char *) (bytes+2), len);
1422 str[len] = '\0';
1423 printf("Utf8 \"%s\"", str);
1424 ent_size = 2 + len;
1425 break;
1426 }
1427 case JVM_CONSTANT_Integer: {
1428 u4 val = Bytes::get_Java_u4(bytes);
1429 printf("int %d", *(int *) &val);
1430 ent_size = 4;
1431 break;
1432 }
1433 case JVM_CONSTANT_Float: {
1434 u4 val = Bytes::get_Java_u4(bytes);
1435 printf("float %5.3ff", *(float *) &val);
1436 ent_size = 4;
1437 break;
1438 }
1439 case JVM_CONSTANT_Long: {
1440 u8 val = Bytes::get_Java_u8(bytes);
1441 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1442 ent_size = 8;
1443 idx++; // Long takes two cpool slots
1444 break;
1445 }
1446 case JVM_CONSTANT_Double: {
1447 u8 val = Bytes::get_Java_u8(bytes);
1448 printf("double %5.3fd", *(jdouble *)&val);
1449 ent_size = 8;
1450 idx++; // Double takes two cpool slots
1451 break;
1452 }
1453 case JVM_CONSTANT_Class: {
1454 idx1 = Bytes::get_Java_u2(bytes);
1455 printf("class #%03d", idx1);
1456 ent_size = 2;
1457 break;
1458 }
1459 case JVM_CONSTANT_String: {
1460 idx1 = Bytes::get_Java_u2(bytes);
1461 printf("String #%03d", idx1);
1462 ent_size = 2;
1463 break;
1464 }
1465 case JVM_CONSTANT_Fieldref: {
1466 idx1 = Bytes::get_Java_u2(bytes);
1467 idx2 = Bytes::get_Java_u2(bytes+2);
1468 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1469 ent_size = 4;
1470 break;
1471 }
1472 case JVM_CONSTANT_Methodref: {
1473 idx1 = Bytes::get_Java_u2(bytes);
1474 idx2 = Bytes::get_Java_u2(bytes+2);
1475 printf("Method #%03d, #%03d", idx1, idx2);
1476 ent_size = 4;
1477 break;
1478 }
1479 case JVM_CONSTANT_InterfaceMethodref: {
1480 idx1 = Bytes::get_Java_u2(bytes);
1481 idx2 = Bytes::get_Java_u2(bytes+2);
1482 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1483 ent_size = 4;
1484 break;
1485 }
1486 case JVM_CONSTANT_NameAndType: {
1487 idx1 = Bytes::get_Java_u2(bytes);
1488 idx2 = Bytes::get_Java_u2(bytes+2);
1489 printf("NameAndType #%03d, #%03d", idx1, idx2);
1490 ent_size = 4;
1491 break;
1492 }
1493 case JVM_CONSTANT_ClassIndex: {
1494 printf("ClassIndex %s", WARN_MSG);
1495 break;
1496 }
1497 case JVM_CONSTANT_UnresolvedClass: {
1498 printf("UnresolvedClass: %s", WARN_MSG);
1499 break;
1500 }
1501 case JVM_CONSTANT_UnresolvedClassInError: {
1502 printf("UnresolvedClassInErr: %s", WARN_MSG);
1503 break;
1504 }
1505 case JVM_CONSTANT_StringIndex: {
1506 printf("StringIndex: %s", WARN_MSG);
1507 break;
1508 }
1509 }
1510 printf(";\n");
1511 bytes += ent_size;
1512 size += ent_size;
1513 }
1514 printf("Cpool size: %d\n", size);
1515 fflush(0);
1516 return;
1517 } /* end print_cpool_bytes */
1518
1519
1520 // Returns size of constant pool entry.
1521 jint ConstantPool::cpool_entry_size(jint idx) {
1522 switch(tag_at(idx).value()) {
1523 case JVM_CONSTANT_Invalid:
1524 case JVM_CONSTANT_Unicode:
1525 return 1;
1526
1527 case JVM_CONSTANT_Utf8:
1528 return 3 + symbol_at(idx)->utf8_length();
1529
1530 case JVM_CONSTANT_Class:
1531 case JVM_CONSTANT_String:
1532 case JVM_CONSTANT_ClassIndex:
1533 case JVM_CONSTANT_UnresolvedClass:
1534 case JVM_CONSTANT_UnresolvedClassInError:
1535 case JVM_CONSTANT_StringIndex:
1536 case JVM_CONSTANT_MethodType:
1537 return 3;
1538
1539 case JVM_CONSTANT_MethodHandle:
1540 return 4; //tag, ref_kind, ref_index
1541
1542 case JVM_CONSTANT_Integer:
1543 case JVM_CONSTANT_Float:
1544 case JVM_CONSTANT_Fieldref:
1545 case JVM_CONSTANT_Methodref:
1546 case JVM_CONSTANT_InterfaceMethodref:
1547 case JVM_CONSTANT_NameAndType:
1548 return 5;
1549
1550 case JVM_CONSTANT_InvokeDynamic:
1551 // u1 tag, u2 bsm, u2 nt
1552 return 5;
1553
1554 case JVM_CONSTANT_Long:
1555 case JVM_CONSTANT_Double:
1556 return 9;
1557 }
1558 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1559 return 1;
1560 } /* end cpool_entry_size */
1561
1562
1563 // SymbolHashMap is used to find a constant pool index from a string.
1564 // This function fills in SymbolHashMaps, one for utf8s and one for
1565 // class names, returns size of the cpool raw bytes.
1566 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1567 SymbolHashMap *classmap) {
1568 jint size = 0;
1569
1570 for (u2 idx = 1; idx < length(); idx++) {
1571 u2 tag = tag_at(idx).value();
1572 size += cpool_entry_size(idx);
1573
1574 switch(tag) {
1575 case JVM_CONSTANT_Utf8: {
1576 Symbol* sym = symbol_at(idx);
1577 symmap->add_entry(sym, idx);
1578 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1579 break;
1580 }
1581 case JVM_CONSTANT_Class:
1582 case JVM_CONSTANT_UnresolvedClass:
1583 case JVM_CONSTANT_UnresolvedClassInError: {
1584 Symbol* sym = klass_name_at(idx);
1585 classmap->add_entry(sym, idx);
1586 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1587 break;
1588 }
1589 case JVM_CONSTANT_Long:
1590 case JVM_CONSTANT_Double: {
1591 idx++; // Both Long and Double take two cpool slots
1592 break;
1593 }
1594 }
1595 }
1596 return size;
1597 } /* end hash_utf8_entries_to */
1598
1599
1600 // Copy cpool bytes.
1601 // Returns:
1602 // 0, in case of OutOfMemoryError
1603 // -1, in case of internal error
1604 // > 0, count of the raw cpool bytes that have been copied
1605 int ConstantPool::copy_cpool_bytes(int cpool_size,
1606 SymbolHashMap* tbl,
1607 unsigned char *bytes) {
1608 u2 idx1, idx2;
1609 jint size = 0;
1610 jint cnt = length();
1611 unsigned char *start_bytes = bytes;
1612
1613 for (jint idx = 1; idx < cnt; idx++) {
1614 u1 tag = tag_at(idx).value();
1615 jint ent_size = cpool_entry_size(idx);
1616
1617 assert(size + ent_size <= cpool_size, "Size mismatch");
1618
1619 *bytes = tag;
1620 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1621 switch(tag) {
1622 case JVM_CONSTANT_Invalid: {
1623 DBG(printf("JVM_CONSTANT_Invalid"));
1624 break;
1625 }
1626 case JVM_CONSTANT_Unicode: {
1627 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1628 DBG(printf("JVM_CONSTANT_Unicode"));
1629 break;
1630 }
1631 case JVM_CONSTANT_Utf8: {
1632 Symbol* sym = symbol_at(idx);
1633 char* str = sym->as_utf8();
1634 // Warning! It's crashing on x86 with len = sym->utf8_length()
1635 int len = (int) strlen(str);
1636 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1637 for (int i = 0; i < len; i++) {
1638 bytes[3+i] = (u1) str[i];
1639 }
1640 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1641 break;
1642 }
1643 case JVM_CONSTANT_Integer: {
1644 jint val = int_at(idx);
1645 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1646 break;
1647 }
1648 case JVM_CONSTANT_Float: {
1649 jfloat val = float_at(idx);
1650 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1651 break;
1652 }
1653 case JVM_CONSTANT_Long: {
1654 jlong val = long_at(idx);
1655 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1656 idx++; // Long takes two cpool slots
1657 break;
1658 }
1659 case JVM_CONSTANT_Double: {
1660 jdouble val = double_at(idx);
1661 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1662 idx++; // Double takes two cpool slots
1663 break;
1664 }
1665 case JVM_CONSTANT_Class:
1666 case JVM_CONSTANT_UnresolvedClass:
1667 case JVM_CONSTANT_UnresolvedClassInError: {
1668 *bytes = JVM_CONSTANT_Class;
1669 Symbol* sym = klass_name_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_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1674 break;
1675 }
1676 case JVM_CONSTANT_String: {
1677 *bytes = JVM_CONSTANT_String;
1678 Symbol* sym = unresolved_string_at(idx);
1679 idx1 = tbl->symbol_to_value(sym);
1680 assert(idx1 != 0, "Have not found a hashtable entry");
1681 Bytes::put_Java_u2((address) (bytes+1), idx1);
1682 DBG(char *str = sym->as_utf8());
1683 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
1684 break;
1685 }
1686 case JVM_CONSTANT_Fieldref:
1687 case JVM_CONSTANT_Methodref:
1688 case JVM_CONSTANT_InterfaceMethodref: {
1689 idx1 = uncached_klass_ref_index_at(idx);
1690 idx2 = uncached_name_and_type_ref_index_at(idx);
1691 Bytes::put_Java_u2((address) (bytes+1), idx1);
1692 Bytes::put_Java_u2((address) (bytes+3), idx2);
1693 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1694 break;
1695 }
1696 case JVM_CONSTANT_NameAndType: {
1697 idx1 = name_ref_index_at(idx);
1698 idx2 = signature_ref_index_at(idx);
1699 Bytes::put_Java_u2((address) (bytes+1), idx1);
1700 Bytes::put_Java_u2((address) (bytes+3), idx2);
1701 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1702 break;
1703 }
1704 case JVM_CONSTANT_ClassIndex: {
1705 *bytes = JVM_CONSTANT_Class;
1706 idx1 = klass_index_at(idx);
1707 Bytes::put_Java_u2((address) (bytes+1), idx1);
1708 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1709 break;
1710 }
1711 case JVM_CONSTANT_StringIndex: {
1712 *bytes = JVM_CONSTANT_String;
1713 idx1 = string_index_at(idx);
1714 Bytes::put_Java_u2((address) (bytes+1), idx1);
1715 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1716 break;
1717 }
1718 case JVM_CONSTANT_MethodHandle:
1719 case JVM_CONSTANT_MethodHandleInError: {
1720 *bytes = JVM_CONSTANT_MethodHandle;
1721 int kind = method_handle_ref_kind_at(idx);
1722 idx1 = method_handle_index_at(idx);
1723 *(bytes+1) = (unsigned char) kind;
1724 Bytes::put_Java_u2((address) (bytes+2), idx1);
1725 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1726 break;
1727 }
1728 case JVM_CONSTANT_MethodType:
1729 case JVM_CONSTANT_MethodTypeInError: {
1730 *bytes = JVM_CONSTANT_MethodType;
1731 idx1 = method_type_index_at(idx);
1732 Bytes::put_Java_u2((address) (bytes+1), idx1);
1733 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1734 break;
1735 }
1736 case JVM_CONSTANT_InvokeDynamic: {
1737 *bytes = tag;
1738 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1739 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1740 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1741 Bytes::put_Java_u2((address) (bytes+1), idx1);
1742 Bytes::put_Java_u2((address) (bytes+3), idx2);
1743 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1744 break;
1745 }
1746 }
1747 DBG(printf("\n"));
1748 bytes += ent_size;
1749 size += ent_size;
1750 }
1751 assert(size == cpool_size, "Size mismatch");
1752
1753 // Keep temorarily for debugging until it's stable.
1754 DBG(print_cpool_bytes(cnt, start_bytes));
1755 return (int)(bytes - start_bytes);
1756 } /* end copy_cpool_bytes */
1757
1758
1759 void ConstantPool::set_on_stack(const bool value) {
1760 _on_stack = value;
1761 if (value) MetadataOnStackMark::record(this);
1762 }
1763
1764 // JSR 292 support for patching constant pool oops after the class is linked and
1765 // the oop array for resolved references are created.
1766 // We can't do this during classfile parsing, which is how the other indexes are
1767 // patched. The other patches are applied early for some error checking
1768 // so only defer the pseudo_strings.
1769 void ConstantPool::patch_resolved_references(
1770 GrowableArray<Handle>* cp_patches) {
1771 assert(EnableInvokeDynamic, "");
1772 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1773 Handle patch = cp_patches->at(index);
1774 if (patch.not_null()) {
1775 assert (tag_at(index).is_string(), "should only be string left");
1776 // Patching a string means pre-resolving it.
1777 // The spelling in the constant pool is ignored.
1778 // The constant reference may be any object whatever.
1779 // If it is not a real interned string, the constant is referred
1780 // to as a "pseudo-string", and must be presented to the CP
1781 // explicitly, because it may require scavenging.
1782 int obj_index = cp_to_object_index(index);
1783 pseudo_string_at_put(index, obj_index, patch());
1784 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1785 }
1786 }
1787 #ifdef ASSERT
1788 // Ensure that all the patches have been used.
1789 for (int index = 0; index < cp_patches->length(); index++) {
1790 assert(cp_patches->at(index).is_null(),
1791 err_msg("Unused constant pool patch at %d in class file %s",
1792 index,
1793 pool_holder()->external_name()));
1794 }
1795 #endif // ASSERT
1796 }
1797
1798 #ifndef PRODUCT
1799
1800 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1801 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1802 guarantee(obj->is_constantPool(), "object must be constant pool");
1803 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1804 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1805
1806 for (int i = 0; i< cp->length(); i++) {
1807 if (cp->tag_at(i).is_unresolved_klass()) {
1808 // This will force loading of the class
1809 Klass* klass = cp->klass_at(i, CHECK);
1810 if (klass->oop_is_instance()) {
1811 // Force initialization of class
1812 InstanceKlass::cast(klass)->initialize(CHECK);
1813 }
1814 }
1815 }
1816 }
1817
1818 #endif
1819
1820
1821 // Printing
1822
1823 void ConstantPool::print_on(outputStream* st) const {
1824 EXCEPTION_MARK;
1825 assert(is_constantPool(), "must be constantPool");
1826 st->print_cr(internal_name());
1827 if (flags() != 0) {
1828 st->print(" - flags: 0x%x", flags());
1829 if (has_pseudo_string()) st->print(" has_pseudo_string");
1830 if (has_invokedynamic()) st->print(" has_invokedynamic");
1831 if (has_preresolution()) st->print(" has_preresolution");
1832 st->cr();
1833 }
1834 if (pool_holder() != NULL) {
1835 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
1836 }
1837 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
1838 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references());
1839 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
1840
1841 for (int index = 1; index < length(); index++) { // Index 0 is unused
1842 ((ConstantPool*)this)->print_entry_on(index, st);
1843 switch (tag_at(index).value()) {
1844 case JVM_CONSTANT_Long :
1845 case JVM_CONSTANT_Double :
1846 index++; // Skip entry following eigth-byte constant
1847 }
1848
1849 }
1850 st->cr();
1851 }
1852
1853 // Print one constant pool entry
1854 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1855 EXCEPTION_MARK;
1856 st->print(" - %3d : ", index);
1857 tag_at(index).print_on(st);
1858 st->print(" : ");
1859 switch (tag_at(index).value()) {
1860 case JVM_CONSTANT_Class :
1861 { Klass* k = klass_at(index, CATCH);
1862 k->print_value_on(st);
1863 st->print(" {0x%lx}", (address)k);
1864 }
1865 break;
1866 case JVM_CONSTANT_Fieldref :
1867 case JVM_CONSTANT_Methodref :
1868 case JVM_CONSTANT_InterfaceMethodref :
1869 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1870 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1871 break;
1872 case JVM_CONSTANT_String :
1873 unresolved_string_at(index)->print_value_on(st);
1874 break;
1875 case JVM_CONSTANT_Object : {
1876 oop anObj = object_at(index);
1877 anObj->print_value_on(st);
1878 st->print(" {0x%lx}", (address)anObj);
1879 } break;
1880 case JVM_CONSTANT_Integer :
1881 st->print("%d", int_at(index));
1882 break;
1883 case JVM_CONSTANT_Float :
1884 st->print("%f", float_at(index));
1885 break;
1886 case JVM_CONSTANT_Long :
1887 st->print_jlong(long_at(index));
1888 break;
1889 case JVM_CONSTANT_Double :
1890 st->print("%lf", double_at(index));
1891 break;
1892 case JVM_CONSTANT_NameAndType :
1893 st->print("name_index=%d", name_ref_index_at(index));
1894 st->print(" signature_index=%d", signature_ref_index_at(index));
1895 break;
1896 case JVM_CONSTANT_Utf8 :
1897 symbol_at(index)->print_value_on(st);
1898 break;
1899 case JVM_CONSTANT_UnresolvedClass : // fall-through
1900 case JVM_CONSTANT_UnresolvedClassInError: {
1901 // unresolved_klass_at requires lock or safe world.
1902 CPSlot entry = slot_at(index);
1903 if (entry.is_resolved()) {
1904 entry.get_klass()->print_value_on(st);
1905 } else {
1906 entry.get_symbol()->print_value_on(st);
1907 }
1908 }
1909 break;
1910 case JVM_CONSTANT_MethodHandle :
1911 case JVM_CONSTANT_MethodHandleInError :
1912 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
1913 st->print(" ref_index=%d", method_handle_index_at(index));
1914 break;
1915 case JVM_CONSTANT_MethodType :
1916 case JVM_CONSTANT_MethodTypeInError :
1917 st->print("signature_index=%d", method_type_index_at(index));
1918 break;
1919 case JVM_CONSTANT_InvokeDynamic :
1920 {
1921 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1922 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1923 int argc = invoke_dynamic_argument_count_at(index);
1924 if (argc > 0) {
1925 for (int arg_i = 0; arg_i < argc; arg_i++) {
1926 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1927 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1928 }
1929 st->print("}");
1930 }
1931 }
1932 break;
1933 default:
1934 ShouldNotReachHere();
1935 break;
1936 }
1937 st->cr();
1938 }
1939
1940 void ConstantPool::print_value_on(outputStream* st) const {
1941 assert(is_constantPool(), "must be constantPool");
1942 st->print("constant pool [%d]", length());
1943 if (has_pseudo_string()) st->print("/pseudo_string");
1944 if (has_invokedynamic()) st->print("/invokedynamic");
1945 if (has_preresolution()) st->print("/preresolution");
1946 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
1947 print_address_on(st);
1948 st->print(" for ");
1949 pool_holder()->print_value_on(st);
1950 if (pool_holder() != NULL) {
1951 bool extra = (pool_holder()->constants() != this);
1952 if (extra) st->print(" (extra)");
1953 }
1954 if (cache() != NULL) {
1955 st->print(" cache=" PTR_FORMAT, cache());
1956 }
1957 }
1958
1959
1960 // Verification
1961
1962 void ConstantPool::verify_on(outputStream* st) {
1963 guarantee(is_constantPool(), "object must be constant pool");
1964 for (int i = 0; i< length(); i++) {
1965 constantTag tag = tag_at(i);
1966 CPSlot entry = slot_at(i);
1967 if (tag.is_klass()) {
1968 if (entry.is_resolved()) {
1969 guarantee(entry.get_klass()->is_metadata(), "should be metadata");
1970 guarantee(entry.get_klass()->is_klass(), "should be klass");
1971 }
1972 } else if (tag.is_unresolved_klass()) {
1973 if (entry.is_resolved()) {
1974 guarantee(entry.get_klass()->is_metadata(), "should be metadata");
1975 guarantee(entry.get_klass()->is_klass(), "should be klass");
1976 }
1977 } else if (tag.is_symbol()) {
1978 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
1979 } else if (tag.is_string()) {
1980 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
1981 }
1982 }
1983 if (cache() != NULL) {
1984 // Note: cache() can be NULL before a class is completely setup or
1985 // in temporary constant pools used during constant pool merging
1986 guarantee(cache()->is_metadata(), "should be metadata");
1987 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
1988 }
1989 if (pool_holder() != NULL) {
1990 // Note: pool_holder() can be NULL in temporary constant pools
1991 // used during constant pool merging
1992 guarantee(pool_holder()->is_metadata(), "should be metadata");
1993 guarantee(pool_holder()->is_klass(), "should be klass");
1994 }
1995 }
1996
1997
1998 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
1999 char *str = sym->as_utf8();
2000 unsigned int hash = compute_hash(str, sym->utf8_length());
2001 unsigned int index = hash % table_size();
2002
2003 // check if already in map
2004 // we prefer the first entry since it is more likely to be what was used in
2005 // the class file
2006 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2007 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2008 if (en->hash() == hash && en->symbol() == sym) {
2009 return; // already there
2010 }
2011 }
2012
2013 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2014 entry->set_next(bucket(index));
2015 _buckets[index].set_entry(entry);
2016 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2017 }
2018
2019 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2020 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2021 char *str = sym->as_utf8();
2022 int len = sym->utf8_length();
2023 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2024 unsigned int index = hash % table_size();
2025 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2026 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2027 if (en->hash() == hash && en->symbol() == sym) {
2028 return en;
2029 }
2030 }
2031 return NULL;
2032 }