1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/metadataOnStackMark.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/heapInspection.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "oops/constantPool.hpp"
37 #include "oops/instanceKlass.hpp"
38 #include "oops/objArrayKlass.hpp"
39 #include "oops/objArrayOop.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "runtime/fieldType.hpp"
42 #include "runtime/init.hpp"
43 #include "runtime/javaCalls.hpp"
44 #include "runtime/signature.hpp"
45 #include "runtime/vframe.hpp"
46 #include "utilities/copy.hpp"
47
48 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
49 // Tags are RW but comment below applies to tags also.
50 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
51
52 int size = ConstantPool::size(length);
53
54 // CDS considerations:
55 // Allocate read-write but may be able to move to read-only at dumping time
56 // if all the klasses are resolved. The only other field that is writable is
57 // the resolved_references array, which is recreated at startup time.
58 // But that could be moved to InstanceKlass (although a pain to access from
59 // assembly code). Maybe it could be moved to the cpCache which is RW.
60 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
61 }
62
63 #ifdef ASSERT
64
65 // MetaspaceObj allocation invariant is calloc equivalent memory
66 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
67 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
68 assert(tags != NULL, "invariant");
69 const int length = tags->length();
70 for (int index = 0; index < length; ++index) {
71 if (JVM_CONSTANT_Invalid != tags->at(index)) {
72 return false;
73 }
74 }
75 return true;
76 }
77
78 #endif
79
80 ConstantPool::ConstantPool(Array<u1>* tags) :
81 _tags(tags),
82 _length(tags->length()) {
83
84 assert(_tags != NULL, "invariant");
85 assert(tags->length() == _length, "invariant");
86 assert(tag_array_is_zero_initialized(tags), "invariant");
87 assert(0 == _flags, "invariant");
88 assert(0 == version(), "invariant");
89 assert(NULL == _pool_holder, "invariant");
90 }
91
92 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
93 MetadataFactory::free_metadata(loader_data, cache());
94 set_cache(NULL);
95 MetadataFactory::free_array<u2>(loader_data, reference_map());
96 set_reference_map(NULL);
97
98 MetadataFactory::free_array<jushort>(loader_data, operands());
99 set_operands(NULL);
100
101 release_C_heap_structures();
102
103 // free tag array
104 MetadataFactory::free_array<u1>(loader_data, tags());
105 set_tags(NULL);
106 }
107
108 void ConstantPool::release_C_heap_structures() {
109 // walk constant pool and decrement symbol reference counts
110 unreference_symbols();
111 }
112
113 objArrayOop ConstantPool::resolved_references() const {
114 return (objArrayOop)JNIHandles::resolve(_resolved_references);
115 }
116
117 // Create resolved_references array and mapping array for original cp indexes
118 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
119 // to map it back for resolving and some unlikely miscellaneous uses.
120 // The objects created by invokedynamic are appended to this list.
121 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
122 const intStack& reference_map,
123 int constant_pool_map_length,
124 TRAPS) {
125 // Initialized the resolved object cache.
126 int map_length = reference_map.length();
127 if (map_length > 0) {
128 // Only need mapping back to constant pool entries. The map isn't used for
129 // invokedynamic resolved_reference entries. For invokedynamic entries,
130 // the constant pool cache index has the mapping back to both the constant
131 // pool and to the resolved reference index.
132 if (constant_pool_map_length > 0) {
133 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
134
135 for (int i = 0; i < constant_pool_map_length; i++) {
136 int x = reference_map.at(i);
137 assert(x == (int)(jushort) x, "klass index is too big");
138 om->at_put(i, (jushort)x);
139 }
140 set_reference_map(om);
141 }
142
143 // Create Java array for holding resolved strings, methodHandles,
144 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
145 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
146 Handle refs_handle (THREAD, (oop)stom); // must handleize.
147 set_resolved_references(loader_data->add_handle(refs_handle));
148 }
149 }
150
151 // CDS support. Create a new resolved_references array.
152 void ConstantPool::restore_unshareable_info(TRAPS) {
153
154 // Only create the new resolved references array if it hasn't been attempted before
155 if (resolved_references() != NULL) return;
156
157 // restore the C++ vtable from the shared archive
158 restore_vtable();
159
160 if (SystemDictionary::Object_klass_loaded()) {
161 // Recreate the object array and add to ClassLoaderData.
162 int map_length = resolved_reference_length();
163 if (map_length > 0) {
164 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
165 Handle refs_handle (THREAD, (oop)stom); // must handleize.
166
167 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
168 set_resolved_references(loader_data->add_handle(refs_handle));
169 }
170 }
171 }
172
173 void ConstantPool::remove_unshareable_info() {
174 // Resolved references are not in the shared archive.
175 // Save the length for restoration. It is not necessarily the same length
176 // as reference_map.length() if invokedynamic is saved.
177 set_resolved_reference_length(
178 resolved_references() != NULL ? resolved_references()->length() : 0);
179 set_resolved_references(NULL);
180 }
181
182 int ConstantPool::cp_to_object_index(int cp_index) {
183 // this is harder don't do this so much.
184 int i = reference_map()->find(cp_index);
185 // We might not find the index for jsr292 call.
186 return (i < 0) ? _no_index_sentinel : i;
187 }
188
189 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, KlassHandle k) {
190 ResourceMark rm;
191 int line_number = -1;
192 const char * source_file = NULL;
193 if (JavaThread::current()->has_last_Java_frame()) {
194 // try to identify the method which called this function.
195 vframeStream vfst(JavaThread::current());
196 if (!vfst.at_end()) {
197 line_number = vfst.method()->line_number_from_bci(vfst.bci());
198 Symbol* s = vfst.method()->method_holder()->source_file_name();
199 if (s != NULL) {
200 source_file = s->as_C_string();
201 }
202 }
203 }
204 if (k() != this_cp->pool_holder()) {
205 // only print something if the classes are different
206 if (source_file != NULL) {
207 log_info(classresolve)("%s %s %s:%d",
208 this_cp->pool_holder()->external_name(),
209 k->external_name(), source_file, line_number);
210 } else {
211 log_info(classresolve)("%s %s",
212 this_cp->pool_holder()->external_name(),
213 k->external_name());
214 }
215 }
216 }
217
218 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
219 bool save_resolution_error, TRAPS) {
220 assert(THREAD->is_Java_thread(), "must be a Java thread");
221
222 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
223 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
224 // the entry and tag is not updated atomicly.
225 CPSlot entry = this_cp->slot_at(which);
226 if (entry.is_resolved()) {
227 assert(entry.get_klass()->is_klass(), "must be");
228 // Already resolved - return entry.
229 return entry.get_klass();
230 }
231
232 // This tag doesn't change back to unresolved class unless at a safepoint.
233 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
234 // The original attempt to resolve this constant pool entry failed so find the
235 // class of the original error and throw another error of the same class
236 // (JVMS 5.4.3).
237 // If there is a detail message, pass that detail message to the error.
238 // The JVMS does not strictly require us to duplicate the same detail message,
239 // or any internal exception fields such as cause or stacktrace. But since the
240 // detail message is often a class name or other literal string, we will repeat it
241 // if we can find it in the symbol table.
242 throw_resolution_error(this_cp, which, CHECK_0);
243 ShouldNotReachHere();
244 }
245
246 Handle mirror_handle;
247 Symbol* name = entry.get_symbol();
248 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
249 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
250 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
251 KlassHandle k (THREAD, kk);
252 if (!HAS_PENDING_EXCEPTION) {
253 // preserve the resolved klass from unloading
254 mirror_handle = Handle(THREAD, kk->java_mirror());
255 // Do access check for klasses
256 verify_constant_pool_resolve(this_cp, k, THREAD);
257 }
258
259 // Failed to resolve class. We must record the errors so that subsequent attempts
260 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
261 if (HAS_PENDING_EXCEPTION) {
262 if (save_resolution_error) {
263 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
264 // If CHECK_NULL above doesn't return the exception, that means that
265 // some other thread has beaten us and has resolved the class.
266 // To preserve old behavior, we return the resolved class.
267 entry = this_cp->resolved_klass_at(which);
268 assert(entry.is_resolved(), "must be resolved if exception was cleared");
269 assert(entry.get_klass()->is_klass(), "must be resolved to a klass");
270 return entry.get_klass();
271 } else {
272 return NULL; // return the pending exception
273 }
274 }
275
276 // Make this class loader depend upon the class loader owning the class reference
277 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
278 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
279
280 if (log_is_enabled(Info, classresolve) && !k->is_array_klass()) {
281 // skip resolving the constant pool so that this code gets
282 // called the next time some bytecodes refer to this class.
283 trace_class_resolution(this_cp, k);
284 return k();
285 } else {
286 this_cp->klass_at_put(which, k());
287 }
288
289 entry = this_cp->resolved_klass_at(which);
290 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
291 return entry.get_klass();
292 }
293
294
295 // Does not update ConstantPool* - to avoid any exception throwing. Used
296 // by compiler and exception handling. Also used to avoid classloads for
297 // instanceof operations. Returns NULL if the class has not been loaded or
298 // if the verification of constant pool failed
299 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
300 CPSlot entry = this_cp->slot_at(which);
301 if (entry.is_resolved()) {
302 assert(entry.get_klass()->is_klass(), "must be");
303 return entry.get_klass();
304 } else {
305 assert(entry.is_unresolved(), "must be either symbol or klass");
306 Thread *thread = Thread::current();
307 Symbol* name = entry.get_symbol();
308 oop loader = this_cp->pool_holder()->class_loader();
309 oop protection_domain = this_cp->pool_holder()->protection_domain();
310 Handle h_prot (thread, protection_domain);
311 Handle h_loader (thread, loader);
312 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
313
314 if (k != NULL) {
315 // Make sure that resolving is legal
316 EXCEPTION_MARK;
317 KlassHandle klass(THREAD, k);
318 // return NULL if verification fails
319 verify_constant_pool_resolve(this_cp, klass, THREAD);
320 if (HAS_PENDING_EXCEPTION) {
321 CLEAR_PENDING_EXCEPTION;
322 return NULL;
323 }
324 return klass();
325 } else {
326 return k;
327 }
328 }
329 }
330
331
332 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) {
333 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which));
334 }
335
336
337 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
338 int which) {
339 if (cpool->cache() == NULL) return NULL; // nothing to load yet
340 int cache_index = decode_cpcache_index(which, true);
341 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
342 // FIXME: should be an assert
343 if (PrintMiscellaneous && (Verbose||WizardMode)) {
344 tty->print_cr("bad operand %d in:", which); cpool->print();
345 }
346 return NULL;
347 }
348 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
349 return e->method_if_resolved(cpool);
350 }
351
352
353 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
354 if (cpool->cache() == NULL) return false; // nothing to load yet
355 int cache_index = decode_cpcache_index(which, true);
356 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
357 return e->has_appendix();
358 }
359
360 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
361 if (cpool->cache() == NULL) return NULL; // nothing to load yet
362 int cache_index = decode_cpcache_index(which, true);
363 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
364 return e->appendix_if_resolved(cpool);
365 }
366
367
368 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
369 if (cpool->cache() == NULL) return false; // nothing to load yet
370 int cache_index = decode_cpcache_index(which, true);
371 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
372 return e->has_method_type();
373 }
374
375 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
376 if (cpool->cache() == NULL) return NULL; // nothing to load yet
377 int cache_index = decode_cpcache_index(which, true);
378 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
379 return e->method_type_if_resolved(cpool);
380 }
381
382
383 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
384 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
385 return symbol_at(name_index);
386 }
387
388
389 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
390 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
391 return symbol_at(signature_index);
392 }
393
394
395 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
396 int i = which;
397 if (!uncached && cache() != NULL) {
398 if (ConstantPool::is_invokedynamic_index(which)) {
399 // Invokedynamic index is index into resolved_references
400 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
401 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
402 assert(tag_at(pool_index).is_name_and_type(), "");
403 return pool_index;
404 }
405 // change byte-ordering and go via cache
406 i = remap_instruction_operand_from_cache(which);
407 } else {
408 if (tag_at(which).is_invoke_dynamic()) {
409 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
410 assert(tag_at(pool_index).is_name_and_type(), "");
411 return pool_index;
412 }
413 }
414 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
415 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
416 jint ref_index = *int_at_addr(i);
417 return extract_high_short_from_int(ref_index);
418 }
419
420
421 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
422 guarantee(!ConstantPool::is_invokedynamic_index(which),
423 "an invokedynamic instruction does not have a klass");
424 int i = which;
425 if (!uncached && cache() != NULL) {
426 // change byte-ordering and go via cache
427 i = remap_instruction_operand_from_cache(which);
428 }
429 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
430 jint ref_index = *int_at_addr(i);
431 return extract_low_short_from_int(ref_index);
432 }
433
434
435
436 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
437 int cpc_index = operand;
438 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
439 assert((int)(u2)cpc_index == cpc_index, "clean u2");
440 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
441 return member_index;
442 }
443
444
445 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, KlassHandle k, TRAPS) {
446 if (k->is_instance_klass() || k->is_objArray_klass()) {
447 instanceKlassHandle holder (THREAD, this_cp->pool_holder());
448 Klass* elem = k->is_instance_klass() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
449 KlassHandle element (THREAD, elem);
450
451 // The element type could be a typeArray - we only need the access check if it is
452 // an reference to another class
453 if (element->is_instance_klass()) {
454 LinkResolver::check_klass_accessability(holder, element, CHECK);
455 }
456 }
457 }
458
459
460 int ConstantPool::name_ref_index_at(int which_nt) {
461 jint ref_index = name_and_type_at(which_nt);
462 return extract_low_short_from_int(ref_index);
463 }
464
465
466 int ConstantPool::signature_ref_index_at(int which_nt) {
467 jint ref_index = name_and_type_at(which_nt);
468 return extract_high_short_from_int(ref_index);
469 }
470
471
472 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
473 return klass_at(klass_ref_index_at(which), THREAD);
474 }
475
476
477 Symbol* ConstantPool::klass_name_at(int which) const {
478 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
479 "Corrupted constant pool");
480 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
481 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
482 // tag is not updated atomicly.
483 CPSlot entry = slot_at(which);
484 if (entry.is_resolved()) {
485 // Already resolved - return entry's name.
486 assert(entry.get_klass()->is_klass(), "must be");
487 return entry.get_klass()->name();
488 } else {
489 assert(entry.is_unresolved(), "must be either symbol or klass");
490 return entry.get_symbol();
491 }
492 }
493
494 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
495 jint ref_index = klass_ref_index_at(which);
496 return klass_at_noresolve(ref_index);
497 }
498
499 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
500 jint ref_index = uncached_klass_ref_index_at(which);
501 return klass_at_noresolve(ref_index);
502 }
503
504 char* ConstantPool::string_at_noresolve(int which) {
505 return unresolved_string_at(which)->as_C_string();
506 }
507
508 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
509 return FieldType::basic_type(symbol_at(which));
510 }
511
512
513 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
514 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
515 if (this_cp->tag_at(index).is_string()) {
516 this_cp->string_at(index, CHECK);
517 }
518 }
519 }
520
521 // Resolve all the classes in the constant pool. If they are all resolved,
522 // the constant pool is read-only. Enhancement: allocate cp entries to
523 // another metaspace, and copy to read-only or read-write space if this
524 // bit is set.
525 bool ConstantPool::resolve_class_constants(TRAPS) {
526 constantPoolHandle cp(THREAD, this);
527 for (int index = 1; index < length(); index++) { // Index 0 is unused
528 if (tag_at(index).is_unresolved_klass() &&
529 klass_at_if_loaded(cp, index) == NULL) {
530 return false;
531 }
532 }
533 // set_preresolution(); or some bit for future use
534 return true;
535 }
536
537 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
538 // Dig out the detailed message to reuse if possible
539 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
540 if (message != NULL) {
541 return message;
542 }
543
544 // Return specific message for the tag
545 switch (tag.value()) {
546 case JVM_CONSTANT_UnresolvedClass:
547 // return the class name in the error message
548 message = this_cp->klass_name_at(which);
549 break;
550 case JVM_CONSTANT_MethodHandle:
551 // return the method handle name in the error message
552 message = this_cp->method_handle_name_ref_at(which);
553 break;
554 case JVM_CONSTANT_MethodType:
555 // return the method type signature in the error message
556 message = this_cp->method_type_signature_at(which);
557 break;
558 default:
559 ShouldNotReachHere();
560 }
561
562 return message;
563 }
564
565 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
566 Symbol* message = NULL;
567 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
568 assert(error != NULL && message != NULL, "checking");
569 CLEAR_PENDING_EXCEPTION;
570 ResourceMark rm;
571 THROW_MSG(error, message->as_C_string());
572 }
573
574 // If resolution for Class, MethodHandle or MethodType fails, save the exception
575 // in the resolution error table, so that the same exception is thrown again.
576 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
577 constantTag tag, TRAPS) {
578 Symbol* error = PENDING_EXCEPTION->klass()->name();
579
580 int error_tag = tag.error_value();
581
582 if (!PENDING_EXCEPTION->
583 is_a(SystemDictionary::LinkageError_klass())) {
584 // Just throw the exception and don't prevent these classes from
585 // being loaded due to virtual machine errors like StackOverflow
586 // and OutOfMemoryError, etc, or if the thread was hit by stop()
587 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
588 } else if (this_cp->tag_at(which).value() != error_tag) {
589 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
590 SystemDictionary::add_resolution_error(this_cp, which, error, message);
591 // CAS in the tag. If a thread beat us to registering this error that's fine.
592 // If another thread resolved the reference, this is a race condition. This
593 // thread may have had a security manager or something temporary.
594 // This doesn't deterministically get an error. So why do we save this?
595 // We save this because jvmti can add classes to the bootclass path after
596 // this error, so it needs to get the same error if the error is first.
597 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
598 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
599 if (old_tag != error_tag && old_tag != tag.value()) {
600 // MethodHandles and MethodType doesn't change to resolved version.
601 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
602 // Forget the exception and use the resolved class.
603 CLEAR_PENDING_EXCEPTION;
604 }
605 } else {
606 // some other thread put this in error state
607 throw_resolution_error(this_cp, which, CHECK);
608 }
609 }
610
611 // Called to resolve constants in the constant pool and return an oop.
612 // Some constant pool entries cache their resolved oop. This is also
613 // called to create oops from constants to use in arguments for invokedynamic
614 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) {
615 oop result_oop = NULL;
616 Handle throw_exception;
617
618 if (cache_index == _possible_index_sentinel) {
619 // It is possible that this constant is one which is cached in the objects.
620 // We'll do a linear search. This should be OK because this usage is rare.
621 assert(index > 0, "valid index");
622 cache_index = this_cp->cp_to_object_index(index);
623 }
624 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
625 assert(index == _no_index_sentinel || index >= 0, "");
626
627 if (cache_index >= 0) {
628 result_oop = this_cp->resolved_references()->obj_at(cache_index);
629 if (result_oop != NULL) {
630 return result_oop;
631 // That was easy...
632 }
633 index = this_cp->object_to_cp_index(cache_index);
634 }
635
636 jvalue prim_value; // temp used only in a few cases below
637
638 constantTag tag = this_cp->tag_at(index);
639
640 switch (tag.value()) {
641
642 case JVM_CONSTANT_UnresolvedClass:
643 case JVM_CONSTANT_UnresolvedClassInError:
644 case JVM_CONSTANT_Class:
645 {
646 assert(cache_index == _no_index_sentinel, "should not have been set");
647 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
648 // ldc wants the java mirror.
649 result_oop = resolved->java_mirror();
650 break;
651 }
652
653 case JVM_CONSTANT_String:
654 assert(cache_index != _no_index_sentinel, "should have been set");
655 if (this_cp->is_pseudo_string_at(index)) {
656 result_oop = this_cp->pseudo_string_at(index, cache_index);
657 break;
658 }
659 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
660 break;
661
662 case JVM_CONSTANT_MethodHandleInError:
663 case JVM_CONSTANT_MethodTypeInError:
664 {
665 throw_resolution_error(this_cp, index, CHECK_NULL);
666 break;
667 }
668
669 case JVM_CONSTANT_MethodHandle:
670 {
671 int ref_kind = this_cp->method_handle_ref_kind_at(index);
672 int callee_index = this_cp->method_handle_klass_index_at(index);
673 Symbol* name = this_cp->method_handle_name_ref_at(index);
674 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
675 if (PrintMiscellaneous)
676 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
677 ref_kind, index, this_cp->method_handle_index_at(index),
678 callee_index, name->as_C_string(), signature->as_C_string());
679 KlassHandle callee;
680 { Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
681 callee = KlassHandle(THREAD, k);
682 }
683 KlassHandle klass(THREAD, this_cp->pool_holder());
684 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
685 callee, name, signature,
686 THREAD);
687 result_oop = value();
688 if (HAS_PENDING_EXCEPTION) {
689 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
690 }
691 break;
692 }
693
694 case JVM_CONSTANT_MethodType:
695 {
696 Symbol* signature = this_cp->method_type_signature_at(index);
697 if (PrintMiscellaneous)
698 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
699 index, this_cp->method_type_index_at(index),
700 signature->as_C_string());
701 KlassHandle klass(THREAD, this_cp->pool_holder());
702 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
703 result_oop = value();
704 if (HAS_PENDING_EXCEPTION) {
705 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
706 }
707 break;
708 }
709
710 case JVM_CONSTANT_Integer:
711 assert(cache_index == _no_index_sentinel, "should not have been set");
712 prim_value.i = this_cp->int_at(index);
713 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
714 break;
715
716 case JVM_CONSTANT_Float:
717 assert(cache_index == _no_index_sentinel, "should not have been set");
718 prim_value.f = this_cp->float_at(index);
719 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
720 break;
721
722 case JVM_CONSTANT_Long:
723 assert(cache_index == _no_index_sentinel, "should not have been set");
724 prim_value.j = this_cp->long_at(index);
725 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
726 break;
727
728 case JVM_CONSTANT_Double:
729 assert(cache_index == _no_index_sentinel, "should not have been set");
730 prim_value.d = this_cp->double_at(index);
731 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
732 break;
733
734 default:
735 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
736 this_cp(), index, cache_index, tag.value()));
737 assert(false, "unexpected constant tag");
738 break;
739 }
740
741 if (cache_index >= 0) {
742 // Benign race condition: resolved_references may already be filled in.
743 // The important thing here is that all threads pick up the same result.
744 // It doesn't matter which racing thread wins, as long as only one
745 // result is used by all threads, and all future queries.
746 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL);
747 if (old_result == NULL) {
748 return result_oop; // was installed
749 } else {
750 // Return the winning thread's result. This can be different than
751 // the result here for MethodHandles.
752 return old_result;
753 }
754 } else {
755 return result_oop;
756 }
757 }
758
759 oop ConstantPool::uncached_string_at(int which, TRAPS) {
760 Symbol* sym = unresolved_string_at(which);
761 oop str = StringTable::intern(sym, CHECK_(NULL));
762 assert(java_lang_String::is_instance(str), "must be string");
763 return str;
764 }
765
766
767 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) {
768 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
769
770 Handle bsm;
771 int argc;
772 {
773 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
774 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
775 // It is accompanied by the optional arguments.
776 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
777 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
778 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
779 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
780 }
781
782 // Extract the optional static arguments.
783 argc = this_cp->invoke_dynamic_argument_count_at(index);
784 if (argc == 0) return bsm_oop;
785
786 bsm = Handle(THREAD, bsm_oop);
787 }
788
789 objArrayHandle info;
790 {
791 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
792 info = objArrayHandle(THREAD, info_oop);
793 }
794
795 info->obj_at_put(0, bsm());
796 for (int i = 0; i < argc; i++) {
797 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
798 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
799 info->obj_at_put(1+i, arg_oop);
800 }
801
802 return info();
803 }
804
805 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
806 // If the string has already been interned, this entry will be non-null
807 oop str = this_cp->resolved_references()->obj_at(obj_index);
808 if (str != NULL) return str;
809 Symbol* sym = this_cp->unresolved_string_at(which);
810 str = StringTable::intern(sym, CHECK_(NULL));
811 this_cp->string_at_put(which, obj_index, str);
812 assert(java_lang_String::is_instance(str), "must be string");
813 return str;
814 }
815
816
817 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
818 int which) {
819 // Names are interned, so we can compare Symbol*s directly
820 Symbol* cp_name = klass_name_at(which);
821 return (cp_name == k->name());
822 }
823
824
825 // Iterate over symbols and decrement ones which are Symbol*s
826 // This is done during GC.
827 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
828 // these symbols but didn't increment the reference count.
829 void ConstantPool::unreference_symbols() {
830 for (int index = 1; index < length(); index++) { // Index 0 is unused
831 constantTag tag = tag_at(index);
832 if (tag.is_symbol()) {
833 symbol_at(index)->decrement_refcount();
834 }
835 }
836 }
837
838
839 // Compare this constant pool's entry at index1 to the constant pool
840 // cp2's entry at index2.
841 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
842 int index2, TRAPS) {
843
844 // The error tags are equivalent to non-error tags when comparing
845 jbyte t1 = tag_at(index1).non_error_value();
846 jbyte t2 = cp2->tag_at(index2).non_error_value();
847
848 if (t1 != t2) {
849 // Not the same entry type so there is nothing else to check. Note
850 // that this style of checking will consider resolved/unresolved
851 // class pairs as different.
852 // From the ConstantPool* API point of view, this is correct
853 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
854 // plays out in the context of ConstantPool* merging.
855 return false;
856 }
857
858 switch (t1) {
859 case JVM_CONSTANT_Class:
860 {
861 Klass* k1 = klass_at(index1, CHECK_false);
862 Klass* k2 = cp2->klass_at(index2, CHECK_false);
863 if (k1 == k2) {
864 return true;
865 }
866 } break;
867
868 case JVM_CONSTANT_ClassIndex:
869 {
870 int recur1 = klass_index_at(index1);
871 int recur2 = cp2->klass_index_at(index2);
872 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
873 if (match) {
874 return true;
875 }
876 } break;
877
878 case JVM_CONSTANT_Double:
879 {
880 jdouble d1 = double_at(index1);
881 jdouble d2 = cp2->double_at(index2);
882 if (d1 == d2) {
883 return true;
884 }
885 } break;
886
887 case JVM_CONSTANT_Fieldref:
888 case JVM_CONSTANT_InterfaceMethodref:
889 case JVM_CONSTANT_Methodref:
890 {
891 int recur1 = uncached_klass_ref_index_at(index1);
892 int recur2 = cp2->uncached_klass_ref_index_at(index2);
893 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
894 if (match) {
895 recur1 = uncached_name_and_type_ref_index_at(index1);
896 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
897 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
898 if (match) {
899 return true;
900 }
901 }
902 } break;
903
904 case JVM_CONSTANT_Float:
905 {
906 jfloat f1 = float_at(index1);
907 jfloat f2 = cp2->float_at(index2);
908 if (f1 == f2) {
909 return true;
910 }
911 } break;
912
913 case JVM_CONSTANT_Integer:
914 {
915 jint i1 = int_at(index1);
916 jint i2 = cp2->int_at(index2);
917 if (i1 == i2) {
918 return true;
919 }
920 } break;
921
922 case JVM_CONSTANT_Long:
923 {
924 jlong l1 = long_at(index1);
925 jlong l2 = cp2->long_at(index2);
926 if (l1 == l2) {
927 return true;
928 }
929 } break;
930
931 case JVM_CONSTANT_NameAndType:
932 {
933 int recur1 = name_ref_index_at(index1);
934 int recur2 = cp2->name_ref_index_at(index2);
935 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
936 if (match) {
937 recur1 = signature_ref_index_at(index1);
938 recur2 = cp2->signature_ref_index_at(index2);
939 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
940 if (match) {
941 return true;
942 }
943 }
944 } break;
945
946 case JVM_CONSTANT_StringIndex:
947 {
948 int recur1 = string_index_at(index1);
949 int recur2 = cp2->string_index_at(index2);
950 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
951 if (match) {
952 return true;
953 }
954 } break;
955
956 case JVM_CONSTANT_UnresolvedClass:
957 {
958 Symbol* k1 = klass_name_at(index1);
959 Symbol* k2 = cp2->klass_name_at(index2);
960 if (k1 == k2) {
961 return true;
962 }
963 } break;
964
965 case JVM_CONSTANT_MethodType:
966 {
967 int k1 = method_type_index_at_error_ok(index1);
968 int k2 = cp2->method_type_index_at_error_ok(index2);
969 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
970 if (match) {
971 return true;
972 }
973 } break;
974
975 case JVM_CONSTANT_MethodHandle:
976 {
977 int k1 = method_handle_ref_kind_at_error_ok(index1);
978 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2);
979 if (k1 == k2) {
980 int i1 = method_handle_index_at_error_ok(index1);
981 int i2 = cp2->method_handle_index_at_error_ok(index2);
982 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
983 if (match) {
984 return true;
985 }
986 }
987 } break;
988
989 case JVM_CONSTANT_InvokeDynamic:
990 {
991 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
992 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
993 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
994 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
995 // separate statements and variables because CHECK_false is used
996 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
997 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
998 return (match_entry && match_operand);
999 } break;
1000
1001 case JVM_CONSTANT_String:
1002 {
1003 Symbol* s1 = unresolved_string_at(index1);
1004 Symbol* s2 = cp2->unresolved_string_at(index2);
1005 if (s1 == s2) {
1006 return true;
1007 }
1008 } break;
1009
1010 case JVM_CONSTANT_Utf8:
1011 {
1012 Symbol* s1 = symbol_at(index1);
1013 Symbol* s2 = cp2->symbol_at(index2);
1014 if (s1 == s2) {
1015 return true;
1016 }
1017 } break;
1018
1019 // Invalid is used as the tag for the second constant pool entry
1020 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1021 // not be seen by itself.
1022 case JVM_CONSTANT_Invalid: // fall through
1023
1024 default:
1025 ShouldNotReachHere();
1026 break;
1027 }
1028
1029 return false;
1030 } // end compare_entry_to()
1031
1032
1033 // Resize the operands array with delta_len and delta_size.
1034 // Used in RedefineClasses for CP merge.
1035 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1036 int old_len = operand_array_length(operands());
1037 int new_len = old_len + delta_len;
1038 int min_len = (delta_len > 0) ? old_len : new_len;
1039
1040 int old_size = operands()->length();
1041 int new_size = old_size + delta_size;
1042 int min_size = (delta_size > 0) ? old_size : new_size;
1043
1044 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1045 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1046
1047 // Set index in the resized array for existing elements only
1048 for (int idx = 0; idx < min_len; idx++) {
1049 int offset = operand_offset_at(idx); // offset in original array
1050 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1051 }
1052 // Copy the bootstrap specifiers only
1053 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1054 new_ops->adr_at(2*new_len),
1055 (min_size - 2*min_len) * sizeof(u2));
1056 // Explicitly deallocate old operands array.
1057 // Note, it is not needed for 7u backport.
1058 if ( operands() != NULL) { // the safety check
1059 MetadataFactory::free_array<u2>(loader_data, operands());
1060 }
1061 set_operands(new_ops);
1062 } // end resize_operands()
1063
1064
1065 // Extend the operands array with the length and size of the ext_cp operands.
1066 // Used in RedefineClasses for CP merge.
1067 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1068 int delta_len = operand_array_length(ext_cp->operands());
1069 if (delta_len == 0) {
1070 return; // nothing to do
1071 }
1072 int delta_size = ext_cp->operands()->length();
1073
1074 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1075
1076 if (operand_array_length(operands()) == 0) {
1077 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1078 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1079 // The first element index defines the offset of second part
1080 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1081 set_operands(new_ops);
1082 } else {
1083 resize_operands(delta_len, delta_size, CHECK);
1084 }
1085
1086 } // end extend_operands()
1087
1088
1089 // Shrink the operands array to a smaller array with new_len length.
1090 // Used in RedefineClasses for CP merge.
1091 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1092 int old_len = operand_array_length(operands());
1093 if (new_len == old_len) {
1094 return; // nothing to do
1095 }
1096 assert(new_len < old_len, "shrunken operands array must be smaller");
1097
1098 int free_base = operand_next_offset_at(new_len - 1);
1099 int delta_len = new_len - old_len;
1100 int delta_size = 2*delta_len + free_base - operands()->length();
1101
1102 resize_operands(delta_len, delta_size, CHECK);
1103
1104 } // end shrink_operands()
1105
1106
1107 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1108 const constantPoolHandle& to_cp,
1109 TRAPS) {
1110
1111 int from_oplen = operand_array_length(from_cp->operands());
1112 int old_oplen = operand_array_length(to_cp->operands());
1113 if (from_oplen != 0) {
1114 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1115 // append my operands to the target's operands array
1116 if (old_oplen == 0) {
1117 // Can't just reuse from_cp's operand list because of deallocation issues
1118 int len = from_cp->operands()->length();
1119 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1120 Copy::conjoint_memory_atomic(
1121 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1122 to_cp->set_operands(new_ops);
1123 } else {
1124 int old_len = to_cp->operands()->length();
1125 int from_len = from_cp->operands()->length();
1126 int old_off = old_oplen * sizeof(u2);
1127 int from_off = from_oplen * sizeof(u2);
1128 // Use the metaspace for the destination constant pool
1129 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1130 int fillp = 0, len = 0;
1131 // first part of dest
1132 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1133 new_operands->adr_at(fillp),
1134 (len = old_off) * sizeof(u2));
1135 fillp += len;
1136 // first part of src
1137 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1138 new_operands->adr_at(fillp),
1139 (len = from_off) * sizeof(u2));
1140 fillp += len;
1141 // second part of dest
1142 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1143 new_operands->adr_at(fillp),
1144 (len = old_len - old_off) * sizeof(u2));
1145 fillp += len;
1146 // second part of src
1147 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1148 new_operands->adr_at(fillp),
1149 (len = from_len - from_off) * sizeof(u2));
1150 fillp += len;
1151 assert(fillp == new_operands->length(), "");
1152
1153 // Adjust indexes in the first part of the copied operands array.
1154 for (int j = 0; j < from_oplen; j++) {
1155 int offset = operand_offset_at(new_operands, old_oplen + j);
1156 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1157 offset += old_len; // every new tuple is preceded by old_len extra u2's
1158 operand_offset_at_put(new_operands, old_oplen + j, offset);
1159 }
1160
1161 // replace target operands array with combined array
1162 to_cp->set_operands(new_operands);
1163 }
1164 }
1165 } // end copy_operands()
1166
1167
1168 // Copy this constant pool's entries at start_i to end_i (inclusive)
1169 // to the constant pool to_cp's entries starting at to_i. A total of
1170 // (end_i - start_i) + 1 entries are copied.
1171 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1172 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1173
1174
1175 int dest_i = to_i; // leave original alone for debug purposes
1176
1177 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1178 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1179
1180 switch (from_cp->tag_at(src_i).value()) {
1181 case JVM_CONSTANT_Double:
1182 case JVM_CONSTANT_Long:
1183 // double and long take two constant pool entries
1184 src_i += 2;
1185 dest_i += 2;
1186 break;
1187
1188 default:
1189 // all others take one constant pool entry
1190 src_i++;
1191 dest_i++;
1192 break;
1193 }
1194 }
1195 copy_operands(from_cp, to_cp, CHECK);
1196
1197 } // end copy_cp_to_impl()
1198
1199
1200 // Copy this constant pool's entry at from_i to the constant pool
1201 // to_cp's entry at to_i.
1202 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1203 const constantPoolHandle& to_cp, int to_i,
1204 TRAPS) {
1205
1206 int tag = from_cp->tag_at(from_i).value();
1207 switch (tag) {
1208 case JVM_CONSTANT_Class:
1209 {
1210 Klass* k = from_cp->klass_at(from_i, CHECK);
1211 to_cp->klass_at_put(to_i, k);
1212 } break;
1213
1214 case JVM_CONSTANT_ClassIndex:
1215 {
1216 jint ki = from_cp->klass_index_at(from_i);
1217 to_cp->klass_index_at_put(to_i, ki);
1218 } break;
1219
1220 case JVM_CONSTANT_Double:
1221 {
1222 jdouble d = from_cp->double_at(from_i);
1223 to_cp->double_at_put(to_i, d);
1224 // double takes two constant pool entries so init second entry's tag
1225 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1226 } break;
1227
1228 case JVM_CONSTANT_Fieldref:
1229 {
1230 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1231 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1232 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1233 } break;
1234
1235 case JVM_CONSTANT_Float:
1236 {
1237 jfloat f = from_cp->float_at(from_i);
1238 to_cp->float_at_put(to_i, f);
1239 } break;
1240
1241 case JVM_CONSTANT_Integer:
1242 {
1243 jint i = from_cp->int_at(from_i);
1244 to_cp->int_at_put(to_i, i);
1245 } break;
1246
1247 case JVM_CONSTANT_InterfaceMethodref:
1248 {
1249 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1250 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1251 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1252 } break;
1253
1254 case JVM_CONSTANT_Long:
1255 {
1256 jlong l = from_cp->long_at(from_i);
1257 to_cp->long_at_put(to_i, l);
1258 // long takes two constant pool entries so init second entry's tag
1259 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1260 } break;
1261
1262 case JVM_CONSTANT_Methodref:
1263 {
1264 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1265 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1266 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1267 } break;
1268
1269 case JVM_CONSTANT_NameAndType:
1270 {
1271 int name_ref_index = from_cp->name_ref_index_at(from_i);
1272 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1273 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1274 } break;
1275
1276 case JVM_CONSTANT_StringIndex:
1277 {
1278 jint si = from_cp->string_index_at(from_i);
1279 to_cp->string_index_at_put(to_i, si);
1280 } break;
1281
1282 case JVM_CONSTANT_UnresolvedClass:
1283 case JVM_CONSTANT_UnresolvedClassInError:
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_String:
1297 {
1298 Symbol* s = from_cp->unresolved_string_at(from_i);
1299 to_cp->unresolved_string_at_put(to_i, s);
1300 } break;
1301
1302 case JVM_CONSTANT_Utf8:
1303 {
1304 Symbol* s = from_cp->symbol_at(from_i);
1305 // Need to increase refcount, the old one will be thrown away and deferenced
1306 s->increment_refcount();
1307 to_cp->symbol_at_put(to_i, s);
1308 } break;
1309
1310 case JVM_CONSTANT_MethodType:
1311 case JVM_CONSTANT_MethodTypeInError:
1312 {
1313 jint k = from_cp->method_type_index_at_error_ok(from_i);
1314 to_cp->method_type_index_at_put(to_i, k);
1315 } break;
1316
1317 case JVM_CONSTANT_MethodHandle:
1318 case JVM_CONSTANT_MethodHandleInError:
1319 {
1320 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i);
1321 int k2 = from_cp->method_handle_index_at_error_ok(from_i);
1322 to_cp->method_handle_index_at_put(to_i, k1, k2);
1323 } break;
1324
1325 case JVM_CONSTANT_InvokeDynamic:
1326 {
1327 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1328 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1329 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1330 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1331 } break;
1332
1333 // Invalid is used as the tag for the second constant pool entry
1334 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1335 // not be seen by itself.
1336 case JVM_CONSTANT_Invalid: // fall through
1337
1338 default:
1339 {
1340 ShouldNotReachHere();
1341 } break;
1342 }
1343 } // end copy_entry_to()
1344
1345
1346 // Search constant pool search_cp for an entry that matches this
1347 // constant pool's entry at pattern_i. Returns the index of a
1348 // matching entry or zero (0) if there is no matching entry.
1349 int ConstantPool::find_matching_entry(int pattern_i,
1350 const constantPoolHandle& search_cp, TRAPS) {
1351
1352 // index zero (0) is not used
1353 for (int i = 1; i < search_cp->length(); i++) {
1354 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1355 if (found) {
1356 return i;
1357 }
1358 }
1359
1360 return 0; // entry not found; return unused index zero (0)
1361 } // end find_matching_entry()
1362
1363
1364 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1365 // cp2's bootstrap specifier at idx2.
1366 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1367 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1368 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1369 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1370
1371 if (!match) {
1372 return false;
1373 }
1374 int argc = operand_argument_count_at(idx1);
1375 if (argc == cp2->operand_argument_count_at(idx2)) {
1376 for (int j = 0; j < argc; j++) {
1377 k1 = operand_argument_index_at(idx1, j);
1378 k2 = cp2->operand_argument_index_at(idx2, j);
1379 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1380 if (!match) {
1381 return false;
1382 }
1383 }
1384 return true; // got through loop; all elements equal
1385 }
1386 return false;
1387 } // end compare_operand_to()
1388
1389 // Search constant pool search_cp for a bootstrap specifier that matches
1390 // this constant pool's bootstrap specifier at pattern_i index.
1391 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1392 int ConstantPool::find_matching_operand(int pattern_i,
1393 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1394 for (int i = 0; i < search_len; i++) {
1395 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1396 if (found) {
1397 return i;
1398 }
1399 }
1400 return -1; // bootstrap specifier not found; return unused index (-1)
1401 } // end find_matching_operand()
1402
1403
1404 #ifndef PRODUCT
1405
1406 const char* ConstantPool::printable_name_at(int which) {
1407
1408 constantTag tag = tag_at(which);
1409
1410 if (tag.is_string()) {
1411 return string_at_noresolve(which);
1412 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1413 return klass_name_at(which)->as_C_string();
1414 } else if (tag.is_symbol()) {
1415 return symbol_at(which)->as_C_string();
1416 }
1417 return "";
1418 }
1419
1420 #endif // PRODUCT
1421
1422
1423 // JVMTI GetConstantPool support
1424
1425 // For debugging of constant pool
1426 const bool debug_cpool = false;
1427
1428 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1429
1430 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1431 const char* WARN_MSG = "Must not be such entry!";
1432 jint size = 0;
1433 u2 idx1, idx2;
1434
1435 for (jint idx = 1; idx < cnt; idx++) {
1436 jint ent_size = 0;
1437 u1 tag = *bytes++;
1438 size++; // count tag
1439
1440 printf("const #%03d, tag: %02d ", idx, tag);
1441 switch(tag) {
1442 case JVM_CONSTANT_Invalid: {
1443 printf("Invalid");
1444 break;
1445 }
1446 case JVM_CONSTANT_Unicode: {
1447 printf("Unicode %s", WARN_MSG);
1448 break;
1449 }
1450 case JVM_CONSTANT_Utf8: {
1451 u2 len = Bytes::get_Java_u2(bytes);
1452 char str[128];
1453 if (len > 127) {
1454 len = 127;
1455 }
1456 strncpy(str, (char *) (bytes+2), len);
1457 str[len] = '\0';
1458 printf("Utf8 \"%s\"", str);
1459 ent_size = 2 + len;
1460 break;
1461 }
1462 case JVM_CONSTANT_Integer: {
1463 u4 val = Bytes::get_Java_u4(bytes);
1464 printf("int %d", *(int *) &val);
1465 ent_size = 4;
1466 break;
1467 }
1468 case JVM_CONSTANT_Float: {
1469 u4 val = Bytes::get_Java_u4(bytes);
1470 printf("float %5.3ff", *(float *) &val);
1471 ent_size = 4;
1472 break;
1473 }
1474 case JVM_CONSTANT_Long: {
1475 u8 val = Bytes::get_Java_u8(bytes);
1476 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1477 ent_size = 8;
1478 idx++; // Long takes two cpool slots
1479 break;
1480 }
1481 case JVM_CONSTANT_Double: {
1482 u8 val = Bytes::get_Java_u8(bytes);
1483 printf("double %5.3fd", *(jdouble *)&val);
1484 ent_size = 8;
1485 idx++; // Double takes two cpool slots
1486 break;
1487 }
1488 case JVM_CONSTANT_Class: {
1489 idx1 = Bytes::get_Java_u2(bytes);
1490 printf("class #%03d", idx1);
1491 ent_size = 2;
1492 break;
1493 }
1494 case JVM_CONSTANT_String: {
1495 idx1 = Bytes::get_Java_u2(bytes);
1496 printf("String #%03d", idx1);
1497 ent_size = 2;
1498 break;
1499 }
1500 case JVM_CONSTANT_Fieldref: {
1501 idx1 = Bytes::get_Java_u2(bytes);
1502 idx2 = Bytes::get_Java_u2(bytes+2);
1503 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1504 ent_size = 4;
1505 break;
1506 }
1507 case JVM_CONSTANT_Methodref: {
1508 idx1 = Bytes::get_Java_u2(bytes);
1509 idx2 = Bytes::get_Java_u2(bytes+2);
1510 printf("Method #%03d, #%03d", idx1, idx2);
1511 ent_size = 4;
1512 break;
1513 }
1514 case JVM_CONSTANT_InterfaceMethodref: {
1515 idx1 = Bytes::get_Java_u2(bytes);
1516 idx2 = Bytes::get_Java_u2(bytes+2);
1517 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1518 ent_size = 4;
1519 break;
1520 }
1521 case JVM_CONSTANT_NameAndType: {
1522 idx1 = Bytes::get_Java_u2(bytes);
1523 idx2 = Bytes::get_Java_u2(bytes+2);
1524 printf("NameAndType #%03d, #%03d", idx1, idx2);
1525 ent_size = 4;
1526 break;
1527 }
1528 case JVM_CONSTANT_ClassIndex: {
1529 printf("ClassIndex %s", WARN_MSG);
1530 break;
1531 }
1532 case JVM_CONSTANT_UnresolvedClass: {
1533 printf("UnresolvedClass: %s", WARN_MSG);
1534 break;
1535 }
1536 case JVM_CONSTANT_UnresolvedClassInError: {
1537 printf("UnresolvedClassInErr: %s", WARN_MSG);
1538 break;
1539 }
1540 case JVM_CONSTANT_StringIndex: {
1541 printf("StringIndex: %s", WARN_MSG);
1542 break;
1543 }
1544 }
1545 printf(";\n");
1546 bytes += ent_size;
1547 size += ent_size;
1548 }
1549 printf("Cpool size: %d\n", size);
1550 fflush(0);
1551 return;
1552 } /* end print_cpool_bytes */
1553
1554
1555 // Returns size of constant pool entry.
1556 jint ConstantPool::cpool_entry_size(jint idx) {
1557 switch(tag_at(idx).value()) {
1558 case JVM_CONSTANT_Invalid:
1559 case JVM_CONSTANT_Unicode:
1560 return 1;
1561
1562 case JVM_CONSTANT_Utf8:
1563 return 3 + symbol_at(idx)->utf8_length();
1564
1565 case JVM_CONSTANT_Class:
1566 case JVM_CONSTANT_String:
1567 case JVM_CONSTANT_ClassIndex:
1568 case JVM_CONSTANT_UnresolvedClass:
1569 case JVM_CONSTANT_UnresolvedClassInError:
1570 case JVM_CONSTANT_StringIndex:
1571 case JVM_CONSTANT_MethodType:
1572 case JVM_CONSTANT_MethodTypeInError:
1573 return 3;
1574
1575 case JVM_CONSTANT_MethodHandle:
1576 case JVM_CONSTANT_MethodHandleInError:
1577 return 4; //tag, ref_kind, ref_index
1578
1579 case JVM_CONSTANT_Integer:
1580 case JVM_CONSTANT_Float:
1581 case JVM_CONSTANT_Fieldref:
1582 case JVM_CONSTANT_Methodref:
1583 case JVM_CONSTANT_InterfaceMethodref:
1584 case JVM_CONSTANT_NameAndType:
1585 return 5;
1586
1587 case JVM_CONSTANT_InvokeDynamic:
1588 // u1 tag, u2 bsm, u2 nt
1589 return 5;
1590
1591 case JVM_CONSTANT_Long:
1592 case JVM_CONSTANT_Double:
1593 return 9;
1594 }
1595 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1596 return 1;
1597 } /* end cpool_entry_size */
1598
1599
1600 // SymbolHashMap is used to find a constant pool index from a string.
1601 // This function fills in SymbolHashMaps, one for utf8s and one for
1602 // class names, returns size of the cpool raw bytes.
1603 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1604 SymbolHashMap *classmap) {
1605 jint size = 0;
1606
1607 for (u2 idx = 1; idx < length(); idx++) {
1608 u2 tag = tag_at(idx).value();
1609 size += cpool_entry_size(idx);
1610
1611 switch(tag) {
1612 case JVM_CONSTANT_Utf8: {
1613 Symbol* sym = symbol_at(idx);
1614 symmap->add_entry(sym, idx);
1615 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1616 break;
1617 }
1618 case JVM_CONSTANT_Class:
1619 case JVM_CONSTANT_UnresolvedClass:
1620 case JVM_CONSTANT_UnresolvedClassInError: {
1621 Symbol* sym = klass_name_at(idx);
1622 classmap->add_entry(sym, idx);
1623 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1624 break;
1625 }
1626 case JVM_CONSTANT_Long:
1627 case JVM_CONSTANT_Double: {
1628 idx++; // Both Long and Double take two cpool slots
1629 break;
1630 }
1631 }
1632 }
1633 return size;
1634 } /* end hash_utf8_entries_to */
1635
1636
1637 // Copy cpool bytes.
1638 // Returns:
1639 // 0, in case of OutOfMemoryError
1640 // -1, in case of internal error
1641 // > 0, count of the raw cpool bytes that have been copied
1642 int ConstantPool::copy_cpool_bytes(int cpool_size,
1643 SymbolHashMap* tbl,
1644 unsigned char *bytes) {
1645 u2 idx1, idx2;
1646 jint size = 0;
1647 jint cnt = length();
1648 unsigned char *start_bytes = bytes;
1649
1650 for (jint idx = 1; idx < cnt; idx++) {
1651 u1 tag = tag_at(idx).value();
1652 jint ent_size = cpool_entry_size(idx);
1653
1654 assert(size + ent_size <= cpool_size, "Size mismatch");
1655
1656 *bytes = tag;
1657 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1658 switch(tag) {
1659 case JVM_CONSTANT_Invalid: {
1660 DBG(printf("JVM_CONSTANT_Invalid"));
1661 break;
1662 }
1663 case JVM_CONSTANT_Unicode: {
1664 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1665 DBG(printf("JVM_CONSTANT_Unicode"));
1666 break;
1667 }
1668 case JVM_CONSTANT_Utf8: {
1669 Symbol* sym = symbol_at(idx);
1670 char* str = sym->as_utf8();
1671 // Warning! It's crashing on x86 with len = sym->utf8_length()
1672 int len = (int) strlen(str);
1673 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1674 for (int i = 0; i < len; i++) {
1675 bytes[3+i] = (u1) str[i];
1676 }
1677 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1678 break;
1679 }
1680 case JVM_CONSTANT_Integer: {
1681 jint val = int_at(idx);
1682 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1683 break;
1684 }
1685 case JVM_CONSTANT_Float: {
1686 jfloat val = float_at(idx);
1687 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1688 break;
1689 }
1690 case JVM_CONSTANT_Long: {
1691 jlong val = long_at(idx);
1692 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1693 idx++; // Long takes two cpool slots
1694 break;
1695 }
1696 case JVM_CONSTANT_Double: {
1697 jdouble val = double_at(idx);
1698 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1699 idx++; // Double takes two cpool slots
1700 break;
1701 }
1702 case JVM_CONSTANT_Class:
1703 case JVM_CONSTANT_UnresolvedClass:
1704 case JVM_CONSTANT_UnresolvedClassInError: {
1705 *bytes = JVM_CONSTANT_Class;
1706 Symbol* sym = klass_name_at(idx);
1707 idx1 = tbl->symbol_to_value(sym);
1708 assert(idx1 != 0, "Have not found a hashtable entry");
1709 Bytes::put_Java_u2((address) (bytes+1), idx1);
1710 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1711 break;
1712 }
1713 case JVM_CONSTANT_String: {
1714 *bytes = JVM_CONSTANT_String;
1715 Symbol* sym = unresolved_string_at(idx);
1716 idx1 = tbl->symbol_to_value(sym);
1717 assert(idx1 != 0, "Have not found a hashtable entry");
1718 Bytes::put_Java_u2((address) (bytes+1), idx1);
1719 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1720 break;
1721 }
1722 case JVM_CONSTANT_Fieldref:
1723 case JVM_CONSTANT_Methodref:
1724 case JVM_CONSTANT_InterfaceMethodref: {
1725 idx1 = uncached_klass_ref_index_at(idx);
1726 idx2 = uncached_name_and_type_ref_index_at(idx);
1727 Bytes::put_Java_u2((address) (bytes+1), idx1);
1728 Bytes::put_Java_u2((address) (bytes+3), idx2);
1729 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1730 break;
1731 }
1732 case JVM_CONSTANT_NameAndType: {
1733 idx1 = name_ref_index_at(idx);
1734 idx2 = signature_ref_index_at(idx);
1735 Bytes::put_Java_u2((address) (bytes+1), idx1);
1736 Bytes::put_Java_u2((address) (bytes+3), idx2);
1737 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1738 break;
1739 }
1740 case JVM_CONSTANT_ClassIndex: {
1741 *bytes = JVM_CONSTANT_Class;
1742 idx1 = klass_index_at(idx);
1743 Bytes::put_Java_u2((address) (bytes+1), idx1);
1744 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1745 break;
1746 }
1747 case JVM_CONSTANT_StringIndex: {
1748 *bytes = JVM_CONSTANT_String;
1749 idx1 = string_index_at(idx);
1750 Bytes::put_Java_u2((address) (bytes+1), idx1);
1751 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1752 break;
1753 }
1754 case JVM_CONSTANT_MethodHandle:
1755 case JVM_CONSTANT_MethodHandleInError: {
1756 *bytes = JVM_CONSTANT_MethodHandle;
1757 int kind = method_handle_ref_kind_at_error_ok(idx);
1758 idx1 = method_handle_index_at_error_ok(idx);
1759 *(bytes+1) = (unsigned char) kind;
1760 Bytes::put_Java_u2((address) (bytes+2), idx1);
1761 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1762 break;
1763 }
1764 case JVM_CONSTANT_MethodType:
1765 case JVM_CONSTANT_MethodTypeInError: {
1766 *bytes = JVM_CONSTANT_MethodType;
1767 idx1 = method_type_index_at_error_ok(idx);
1768 Bytes::put_Java_u2((address) (bytes+1), idx1);
1769 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1770 break;
1771 }
1772 case JVM_CONSTANT_InvokeDynamic: {
1773 *bytes = tag;
1774 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1775 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1776 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1777 Bytes::put_Java_u2((address) (bytes+1), idx1);
1778 Bytes::put_Java_u2((address) (bytes+3), idx2);
1779 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1780 break;
1781 }
1782 }
1783 DBG(printf("\n"));
1784 bytes += ent_size;
1785 size += ent_size;
1786 }
1787 assert(size == cpool_size, "Size mismatch");
1788
1789 // Keep temorarily for debugging until it's stable.
1790 DBG(print_cpool_bytes(cnt, start_bytes));
1791 return (int)(bytes - start_bytes);
1792 } /* end copy_cpool_bytes */
1793
1794 #undef DBG
1795
1796
1797 void ConstantPool::set_on_stack(const bool value) {
1798 if (value) {
1799 // Only record if it's not already set.
1800 if (!on_stack()) {
1801 _flags |= _on_stack;
1802 MetadataOnStackMark::record(this);
1803 }
1804 } else {
1805 // Clearing is done single-threadedly.
1806 _flags &= ~_on_stack;
1807 }
1808 }
1809
1810 // JSR 292 support for patching constant pool oops after the class is linked and
1811 // the oop array for resolved references are created.
1812 // We can't do this during classfile parsing, which is how the other indexes are
1813 // patched. The other patches are applied early for some error checking
1814 // so only defer the pseudo_strings.
1815 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
1816 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1817 Handle patch = cp_patches->at(index);
1818 if (patch.not_null()) {
1819 assert (tag_at(index).is_string(), "should only be string left");
1820 // Patching a string means pre-resolving it.
1821 // The spelling in the constant pool is ignored.
1822 // The constant reference may be any object whatever.
1823 // If it is not a real interned string, the constant is referred
1824 // to as a "pseudo-string", and must be presented to the CP
1825 // explicitly, because it may require scavenging.
1826 int obj_index = cp_to_object_index(index);
1827 pseudo_string_at_put(index, obj_index, patch());
1828 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1829 }
1830 }
1831 #ifdef ASSERT
1832 // Ensure that all the patches have been used.
1833 for (int index = 0; index < cp_patches->length(); index++) {
1834 assert(cp_patches->at(index).is_null(),
1835 "Unused constant pool patch at %d in class file %s",
1836 index,
1837 pool_holder()->external_name());
1838 }
1839 #endif // ASSERT
1840 }
1841
1842 #ifndef PRODUCT
1843
1844 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1845 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1846 guarantee(obj->is_constantPool(), "object must be constant pool");
1847 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1848 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1849
1850 for (int i = 0; i< cp->length(); i++) {
1851 if (cp->tag_at(i).is_unresolved_klass()) {
1852 // This will force loading of the class
1853 Klass* klass = cp->klass_at(i, CHECK);
1854 if (klass->is_instance_klass()) {
1855 // Force initialization of class
1856 InstanceKlass::cast(klass)->initialize(CHECK);
1857 }
1858 }
1859 }
1860 }
1861
1862 #endif
1863
1864
1865 // Printing
1866
1867 void ConstantPool::print_on(outputStream* st) const {
1868 assert(is_constantPool(), "must be constantPool");
1869 st->print_cr("%s", internal_name());
1870 if (flags() != 0) {
1871 st->print(" - flags: 0x%x", flags());
1872 if (has_preresolution()) st->print(" has_preresolution");
1873 if (on_stack()) st->print(" on_stack");
1874 st->cr();
1875 }
1876 if (pool_holder() != NULL) {
1877 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
1878 }
1879 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
1880 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
1881 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
1882
1883 for (int index = 1; index < length(); index++) { // Index 0 is unused
1884 ((ConstantPool*)this)->print_entry_on(index, st);
1885 switch (tag_at(index).value()) {
1886 case JVM_CONSTANT_Long :
1887 case JVM_CONSTANT_Double :
1888 index++; // Skip entry following eigth-byte constant
1889 }
1890
1891 }
1892 st->cr();
1893 }
1894
1895 // Print one constant pool entry
1896 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1897 EXCEPTION_MARK;
1898 st->print(" - %3d : ", index);
1899 tag_at(index).print_on(st);
1900 st->print(" : ");
1901 switch (tag_at(index).value()) {
1902 case JVM_CONSTANT_Class :
1903 { Klass* k = klass_at(index, CATCH);
1904 guarantee(k != NULL, "need klass");
1905 k->print_value_on(st);
1906 st->print(" {" PTR_FORMAT "}", p2i(k));
1907 }
1908 break;
1909 case JVM_CONSTANT_Fieldref :
1910 case JVM_CONSTANT_Methodref :
1911 case JVM_CONSTANT_InterfaceMethodref :
1912 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1913 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1914 break;
1915 case JVM_CONSTANT_String :
1916 if (is_pseudo_string_at(index)) {
1917 oop anObj = pseudo_string_at(index);
1918 anObj->print_value_on(st);
1919 st->print(" {" PTR_FORMAT "}", p2i(anObj));
1920 } else {
1921 unresolved_string_at(index)->print_value_on(st);
1922 }
1923 break;
1924 case JVM_CONSTANT_Integer :
1925 st->print("%d", int_at(index));
1926 break;
1927 case JVM_CONSTANT_Float :
1928 st->print("%f", float_at(index));
1929 break;
1930 case JVM_CONSTANT_Long :
1931 st->print_jlong(long_at(index));
1932 break;
1933 case JVM_CONSTANT_Double :
1934 st->print("%lf", double_at(index));
1935 break;
1936 case JVM_CONSTANT_NameAndType :
1937 st->print("name_index=%d", name_ref_index_at(index));
1938 st->print(" signature_index=%d", signature_ref_index_at(index));
1939 break;
1940 case JVM_CONSTANT_Utf8 :
1941 symbol_at(index)->print_value_on(st);
1942 break;
1943 case JVM_CONSTANT_UnresolvedClass : // fall-through
1944 case JVM_CONSTANT_UnresolvedClassInError: {
1945 CPSlot entry = slot_at(index);
1946 if (entry.is_resolved()) {
1947 entry.get_klass()->print_value_on(st);
1948 } else {
1949 entry.get_symbol()->print_value_on(st);
1950 }
1951 }
1952 break;
1953 case JVM_CONSTANT_MethodHandle :
1954 case JVM_CONSTANT_MethodHandleInError :
1955 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index));
1956 st->print(" ref_index=%d", method_handle_index_at_error_ok(index));
1957 break;
1958 case JVM_CONSTANT_MethodType :
1959 case JVM_CONSTANT_MethodTypeInError :
1960 st->print("signature_index=%d", method_type_index_at_error_ok(index));
1961 break;
1962 case JVM_CONSTANT_InvokeDynamic :
1963 {
1964 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1965 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1966 int argc = invoke_dynamic_argument_count_at(index);
1967 if (argc > 0) {
1968 for (int arg_i = 0; arg_i < argc; arg_i++) {
1969 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1970 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1971 }
1972 st->print("}");
1973 }
1974 }
1975 break;
1976 default:
1977 ShouldNotReachHere();
1978 break;
1979 }
1980 st->cr();
1981 }
1982
1983 void ConstantPool::print_value_on(outputStream* st) const {
1984 assert(is_constantPool(), "must be constantPool");
1985 st->print("constant pool [%d]", length());
1986 if (has_preresolution()) st->print("/preresolution");
1987 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
1988 print_address_on(st);
1989 st->print(" for ");
1990 pool_holder()->print_value_on(st);
1991 if (pool_holder() != NULL) {
1992 bool extra = (pool_holder()->constants() != this);
1993 if (extra) st->print(" (extra)");
1994 }
1995 if (cache() != NULL) {
1996 st->print(" cache=" PTR_FORMAT, p2i(cache()));
1997 }
1998 }
1999
2000 #if INCLUDE_SERVICES
2001 // Size Statistics
2002 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2003 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2004 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2005 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2006 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2007 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2008
2009 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2010 sz->_cp_refmap_bytes;
2011 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2012 }
2013 #endif // INCLUDE_SERVICES
2014
2015 // Verification
2016
2017 void ConstantPool::verify_on(outputStream* st) {
2018 guarantee(is_constantPool(), "object must be constant pool");
2019 for (int i = 0; i< length(); i++) {
2020 constantTag tag = tag_at(i);
2021 CPSlot entry = slot_at(i);
2022 if (tag.is_klass()) {
2023 if (entry.is_resolved()) {
2024 guarantee(entry.get_klass()->is_klass(), "should be klass");
2025 }
2026 } else if (tag.is_unresolved_klass()) {
2027 if (entry.is_resolved()) {
2028 guarantee(entry.get_klass()->is_klass(), "should be klass");
2029 }
2030 } else if (tag.is_symbol()) {
2031 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2032 } else if (tag.is_string()) {
2033 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2034 }
2035 }
2036 if (cache() != NULL) {
2037 // Note: cache() can be NULL before a class is completely setup or
2038 // in temporary constant pools used during constant pool merging
2039 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2040 }
2041 if (pool_holder() != NULL) {
2042 // Note: pool_holder() can be NULL in temporary constant pools
2043 // used during constant pool merging
2044 guarantee(pool_holder()->is_klass(), "should be klass");
2045 }
2046 }
2047
2048
2049 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2050 char *str = sym->as_utf8();
2051 unsigned int hash = compute_hash(str, sym->utf8_length());
2052 unsigned int index = hash % table_size();
2053
2054 // check if already in map
2055 // we prefer the first entry since it is more likely to be what was used in
2056 // the class file
2057 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2058 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2059 if (en->hash() == hash && en->symbol() == sym) {
2060 return; // already there
2061 }
2062 }
2063
2064 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2065 entry->set_next(bucket(index));
2066 _buckets[index].set_entry(entry);
2067 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2068 }
2069
2070 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2071 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2072 char *str = sym->as_utf8();
2073 int len = sym->utf8_length();
2074 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2075 unsigned int index = hash % table_size();
2076 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2077 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2078 if (en->hash() == hash && en->symbol() == sym) {
2079 return en;
2080 }
2081 }
2082 return NULL;
2083 }