1 /*
2 * Copyright (c) 1997, 2016, 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::string_at_put(int which, int obj_index, oop str) {
190 resolved_references()->obj_at_put(obj_index, str);
191 }
192
193 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, KlassHandle k) {
194 ResourceMark rm;
195 int line_number = -1;
196 const char * source_file = NULL;
197 if (JavaThread::current()->has_last_Java_frame()) {
198 // try to identify the method which called this function.
199 vframeStream vfst(JavaThread::current());
200 if (!vfst.at_end()) {
201 line_number = vfst.method()->line_number_from_bci(vfst.bci());
202 Symbol* s = vfst.method()->method_holder()->source_file_name();
203 if (s != NULL) {
204 source_file = s->as_C_string();
205 }
206 }
207 }
208 if (k() != this_cp->pool_holder()) {
209 // only print something if the classes are different
210 if (source_file != NULL) {
211 log_info(classresolve)("%s %s %s:%d",
212 this_cp->pool_holder()->external_name(),
213 k->external_name(), source_file, line_number);
214 } else {
215 log_info(classresolve)("%s %s",
216 this_cp->pool_holder()->external_name(),
217 k->external_name());
218 }
219 }
220 }
221
222 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
223 bool save_resolution_error, TRAPS) {
224 assert(THREAD->is_Java_thread(), "must be a Java thread");
225
226 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
227 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
228 // the entry and tag is not updated atomicly.
229 CPSlot entry = this_cp->slot_at(which);
230 if (entry.is_resolved()) {
231 assert(entry.get_klass()->is_klass(), "must be");
232 // Already resolved - return entry.
233 return entry.get_klass();
234 }
235
236 // This tag doesn't change back to unresolved class unless at a safepoint.
237 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
238 // The original attempt to resolve this constant pool entry failed so find the
239 // class of the original error and throw another error of the same class
240 // (JVMS 5.4.3).
241 // If there is a detail message, pass that detail message to the error.
242 // The JVMS does not strictly require us to duplicate the same detail message,
243 // or any internal exception fields such as cause or stacktrace. But since the
244 // detail message is often a class name or other literal string, we will repeat it
245 // if we can find it in the symbol table.
246 throw_resolution_error(this_cp, which, CHECK_0);
247 ShouldNotReachHere();
248 }
249
250 Handle mirror_handle;
251 Symbol* name = entry.get_symbol();
252 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
253 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
254 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
255 KlassHandle k (THREAD, kk);
256 if (!HAS_PENDING_EXCEPTION) {
257 // preserve the resolved klass from unloading
258 mirror_handle = Handle(THREAD, kk->java_mirror());
259 // Do access check for klasses
260 verify_constant_pool_resolve(this_cp, k, THREAD);
261 }
262
263 // Failed to resolve class. We must record the errors so that subsequent attempts
264 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
265 if (HAS_PENDING_EXCEPTION) {
266 if (save_resolution_error) {
267 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
268 // If CHECK_NULL above doesn't return the exception, that means that
269 // some other thread has beaten us and has resolved the class.
270 // To preserve old behavior, we return the resolved class.
271 entry = this_cp->resolved_klass_at(which);
272 assert(entry.is_resolved(), "must be resolved if exception was cleared");
273 assert(entry.get_klass()->is_klass(), "must be resolved to a klass");
274 return entry.get_klass();
275 } else {
276 return NULL; // return the pending exception
277 }
278 }
279
280 // Make this class loader depend upon the class loader owning the class reference
281 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
282 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
283
284 if (log_is_enabled(Info, classresolve) && !k->is_array_klass()) {
285 // skip resolving the constant pool so that this code gets
286 // called the next time some bytecodes refer to this class.
287 trace_class_resolution(this_cp, k);
288 return k();
289 } else {
290 this_cp->klass_at_put(which, k());
291 }
292
293 entry = this_cp->resolved_klass_at(which);
294 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
295 return entry.get_klass();
296 }
297
298
299 // Does not update ConstantPool* - to avoid any exception throwing. Used
300 // by compiler and exception handling. Also used to avoid classloads for
301 // instanceof operations. Returns NULL if the class has not been loaded or
302 // if the verification of constant pool failed
303 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
304 CPSlot entry = this_cp->slot_at(which);
305 if (entry.is_resolved()) {
306 assert(entry.get_klass()->is_klass(), "must be");
307 return entry.get_klass();
308 } else {
309 assert(entry.is_unresolved(), "must be either symbol or klass");
310 Thread *thread = Thread::current();
311 Symbol* name = entry.get_symbol();
312 oop loader = this_cp->pool_holder()->class_loader();
313 oop protection_domain = this_cp->pool_holder()->protection_domain();
314 Handle h_prot (thread, protection_domain);
315 Handle h_loader (thread, loader);
316 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
317
318 if (k != NULL) {
319 // Make sure that resolving is legal
320 EXCEPTION_MARK;
321 KlassHandle klass(THREAD, k);
322 // return NULL if verification fails
323 verify_constant_pool_resolve(this_cp, klass, THREAD);
324 if (HAS_PENDING_EXCEPTION) {
325 CLEAR_PENDING_EXCEPTION;
326 return NULL;
327 }
328 return klass();
329 } else {
330 return k;
331 }
332 }
333 }
334
335
336 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) {
337 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which));
338 }
339
340
341 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
342 int which) {
343 if (cpool->cache() == NULL) return NULL; // nothing to load yet
344 int cache_index = decode_cpcache_index(which, true);
345 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
346 // FIXME: should be an assert
347 if (PrintMiscellaneous && (Verbose||WizardMode)) {
348 tty->print_cr("bad operand %d in:", which); cpool->print();
349 }
350 return NULL;
351 }
352 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
353 return e->method_if_resolved(cpool);
354 }
355
356
357 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
358 if (cpool->cache() == NULL) return false; // nothing to load yet
359 int cache_index = decode_cpcache_index(which, true);
360 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
361 return e->has_appendix();
362 }
363
364 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
365 if (cpool->cache() == NULL) return NULL; // nothing to load yet
366 int cache_index = decode_cpcache_index(which, true);
367 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
368 return e->appendix_if_resolved(cpool);
369 }
370
371
372 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
373 if (cpool->cache() == NULL) return false; // nothing to load yet
374 int cache_index = decode_cpcache_index(which, true);
375 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
376 return e->has_method_type();
377 }
378
379 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
380 if (cpool->cache() == NULL) return NULL; // nothing to load yet
381 int cache_index = decode_cpcache_index(which, true);
382 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
383 return e->method_type_if_resolved(cpool);
384 }
385
386
387 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
388 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
389 return symbol_at(name_index);
390 }
391
392
393 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
394 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
395 return symbol_at(signature_index);
396 }
397
398
399 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
400 int i = which;
401 if (!uncached && cache() != NULL) {
402 if (ConstantPool::is_invokedynamic_index(which)) {
403 // Invokedynamic index is index into resolved_references
404 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
405 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
406 assert(tag_at(pool_index).is_name_and_type(), "");
407 return pool_index;
408 }
409 // change byte-ordering and go via cache
410 i = remap_instruction_operand_from_cache(which);
411 } else {
412 if (tag_at(which).is_invoke_dynamic()) {
413 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
414 assert(tag_at(pool_index).is_name_and_type(), "");
415 return pool_index;
416 }
417 }
418 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
419 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
420 jint ref_index = *int_at_addr(i);
421 return extract_high_short_from_int(ref_index);
422 }
423
424 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
425 int pool_index = which;
426 if (!uncached && cache() != NULL) {
427 if (ConstantPool::is_invokedynamic_index(which)) {
428 // Invokedynamic index is index into resolved_references
429 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
430 } else {
431 // change byte-ordering and go via cache
432 pool_index = remap_instruction_operand_from_cache(which);
433 }
434 }
435 return tag_at(pool_index);
436 }
437
438 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
439 guarantee(!ConstantPool::is_invokedynamic_index(which),
440 "an invokedynamic instruction does not have a klass");
441 int i = which;
442 if (!uncached && cache() != NULL) {
443 // change byte-ordering and go via cache
444 i = remap_instruction_operand_from_cache(which);
445 }
446 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
447 jint ref_index = *int_at_addr(i);
448 return extract_low_short_from_int(ref_index);
449 }
450
451
452
453 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
454 int cpc_index = operand;
455 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
456 assert((int)(u2)cpc_index == cpc_index, "clean u2");
457 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
458 return member_index;
459 }
460
461
462 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, KlassHandle k, TRAPS) {
463 if (k->is_instance_klass() || k->is_objArray_klass()) {
464 instanceKlassHandle holder (THREAD, this_cp->pool_holder());
465 Klass* elem = k->is_instance_klass() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
466 KlassHandle element (THREAD, elem);
467
468 // The element type could be a typeArray - we only need the access check if it is
469 // an reference to another class
470 if (element->is_instance_klass()) {
471 LinkResolver::check_klass_accessability(holder, element, CHECK);
472 }
473 }
474 }
475
476
477 int ConstantPool::name_ref_index_at(int which_nt) {
478 jint ref_index = name_and_type_at(which_nt);
479 return extract_low_short_from_int(ref_index);
480 }
481
482
483 int ConstantPool::signature_ref_index_at(int which_nt) {
484 jint ref_index = name_and_type_at(which_nt);
485 return extract_high_short_from_int(ref_index);
486 }
487
488
489 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
490 return klass_at(klass_ref_index_at(which), THREAD);
491 }
492
493
494 Symbol* ConstantPool::klass_name_at(int which) const {
495 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
496 "Corrupted constant pool");
497 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
498 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
499 // tag is not updated atomicly.
500 CPSlot entry = slot_at(which);
501 if (entry.is_resolved()) {
502 // Already resolved - return entry's name.
503 assert(entry.get_klass()->is_klass(), "must be");
504 return entry.get_klass()->name();
505 } else {
506 assert(entry.is_unresolved(), "must be either symbol or klass");
507 return entry.get_symbol();
508 }
509 }
510
511 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
512 jint ref_index = klass_ref_index_at(which);
513 return klass_at_noresolve(ref_index);
514 }
515
516 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
517 jint ref_index = uncached_klass_ref_index_at(which);
518 return klass_at_noresolve(ref_index);
519 }
520
521 char* ConstantPool::string_at_noresolve(int which) {
522 return unresolved_string_at(which)->as_C_string();
523 }
524
525 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
526 return FieldType::basic_type(symbol_at(which));
527 }
528
529
530 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
531 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
532 if (this_cp->tag_at(index).is_string()) {
533 this_cp->string_at(index, CHECK);
534 }
535 }
536 }
537
538 // Resolve all the classes in the constant pool. If they are all resolved,
539 // the constant pool is read-only. Enhancement: allocate cp entries to
540 // another metaspace, and copy to read-only or read-write space if this
541 // bit is set.
542 bool ConstantPool::resolve_class_constants(TRAPS) {
543 constantPoolHandle cp(THREAD, this);
544 for (int index = 1; index < length(); index++) { // Index 0 is unused
545 if (tag_at(index).is_unresolved_klass() &&
546 klass_at_if_loaded(cp, index) == NULL) {
547 return false;
548 }
549 }
550 // set_preresolution(); or some bit for future use
551 return true;
552 }
553
554 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
555 // Dig out the detailed message to reuse if possible
556 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
557 if (message != NULL) {
558 return message;
559 }
560
561 // Return specific message for the tag
562 switch (tag.value()) {
563 case JVM_CONSTANT_UnresolvedClass:
564 // return the class name in the error message
565 message = this_cp->klass_name_at(which);
566 break;
567 case JVM_CONSTANT_MethodHandle:
568 // return the method handle name in the error message
569 message = this_cp->method_handle_name_ref_at(which);
570 break;
571 case JVM_CONSTANT_MethodType:
572 // return the method type signature in the error message
573 message = this_cp->method_type_signature_at(which);
574 break;
575 default:
576 ShouldNotReachHere();
577 }
578
579 return message;
580 }
581
582 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
583 Symbol* message = NULL;
584 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
585 assert(error != NULL && message != NULL, "checking");
586 CLEAR_PENDING_EXCEPTION;
587 ResourceMark rm;
588 THROW_MSG(error, message->as_C_string());
589 }
590
591 // If resolution for Class, MethodHandle or MethodType fails, save the exception
592 // in the resolution error table, so that the same exception is thrown again.
593 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
594 constantTag tag, TRAPS) {
595 Symbol* error = PENDING_EXCEPTION->klass()->name();
596
597 int error_tag = tag.error_value();
598
599 if (!PENDING_EXCEPTION->
600 is_a(SystemDictionary::LinkageError_klass())) {
601 // Just throw the exception and don't prevent these classes from
602 // being loaded due to virtual machine errors like StackOverflow
603 // and OutOfMemoryError, etc, or if the thread was hit by stop()
604 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
605 } else if (this_cp->tag_at(which).value() != error_tag) {
606 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
607 SystemDictionary::add_resolution_error(this_cp, which, error, message);
608 // CAS in the tag. If a thread beat us to registering this error that's fine.
609 // If another thread resolved the reference, this is a race condition. This
610 // thread may have had a security manager or something temporary.
611 // This doesn't deterministically get an error. So why do we save this?
612 // We save this because jvmti can add classes to the bootclass path after
613 // this error, so it needs to get the same error if the error is first.
614 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
615 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
616 if (old_tag != error_tag && old_tag != tag.value()) {
617 // MethodHandles and MethodType doesn't change to resolved version.
618 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
619 // Forget the exception and use the resolved class.
620 CLEAR_PENDING_EXCEPTION;
621 }
622 } else {
623 // some other thread put this in error state
624 throw_resolution_error(this_cp, which, CHECK);
625 }
626 }
627
628 // Called to resolve constants in the constant pool and return an oop.
629 // Some constant pool entries cache their resolved oop. This is also
630 // called to create oops from constants to use in arguments for invokedynamic
631 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) {
632 oop result_oop = NULL;
633 Handle throw_exception;
634
635 if (cache_index == _possible_index_sentinel) {
636 // It is possible that this constant is one which is cached in the objects.
637 // We'll do a linear search. This should be OK because this usage is rare.
638 assert(index > 0, "valid index");
639 cache_index = this_cp->cp_to_object_index(index);
640 }
641 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
642 assert(index == _no_index_sentinel || index >= 0, "");
643
644 if (cache_index >= 0) {
645 result_oop = this_cp->resolved_references()->obj_at(cache_index);
646 if (result_oop != NULL) {
647 return result_oop;
648 // That was easy...
649 }
650 index = this_cp->object_to_cp_index(cache_index);
651 }
652
653 jvalue prim_value; // temp used only in a few cases below
654
655 constantTag tag = this_cp->tag_at(index);
656
657 switch (tag.value()) {
658
659 case JVM_CONSTANT_UnresolvedClass:
660 case JVM_CONSTANT_UnresolvedClassInError:
661 case JVM_CONSTANT_Class:
662 {
663 assert(cache_index == _no_index_sentinel, "should not have been set");
664 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
665 // ldc wants the java mirror.
666 result_oop = resolved->java_mirror();
667 break;
668 }
669
670 case JVM_CONSTANT_String:
671 assert(cache_index != _no_index_sentinel, "should have been set");
672 if (this_cp->is_pseudo_string_at(index)) {
673 result_oop = this_cp->pseudo_string_at(index, cache_index);
674 break;
675 }
676 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
677 break;
678
679 case JVM_CONSTANT_MethodHandleInError:
680 case JVM_CONSTANT_MethodTypeInError:
681 {
682 throw_resolution_error(this_cp, index, CHECK_NULL);
683 break;
684 }
685
686 case JVM_CONSTANT_MethodHandle:
687 {
688 int ref_kind = this_cp->method_handle_ref_kind_at(index);
689 int callee_index = this_cp->method_handle_klass_index_at(index);
690 Symbol* name = this_cp->method_handle_name_ref_at(index);
691 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
692 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
693 if (PrintMiscellaneous)
694 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
695 ref_kind, index, this_cp->method_handle_index_at(index),
696 callee_index, name->as_C_string(), signature->as_C_string());
697 KlassHandle callee;
698 { Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
699 callee = KlassHandle(THREAD, k);
700 }
701 // Check tag consistency, relax for interface static default method.
702 if ((callee->is_interface() && !m_tag.is_interface_method()) ||
703 (!callee->is_interface() && m_tag.is_interface_method())) {
704 ResourceMark rm(THREAD);
705 char buf[200];
706 jio_snprintf(buf, sizeof(buf), "Inconsistent constant data for %s.%s%s at index %d",
707 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index);
708 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
709 }
710
711 KlassHandle klass(THREAD, this_cp->pool_holder());
712 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
713 callee, name, signature,
714 THREAD);
715 result_oop = value();
716 if (HAS_PENDING_EXCEPTION) {
717 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
718 }
719 break;
720 }
721
722 case JVM_CONSTANT_MethodType:
723 {
724 Symbol* signature = this_cp->method_type_signature_at(index);
725 if (PrintMiscellaneous)
726 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
727 index, this_cp->method_type_index_at(index),
728 signature->as_C_string());
729 KlassHandle klass(THREAD, this_cp->pool_holder());
730 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
731 result_oop = value();
732 if (HAS_PENDING_EXCEPTION) {
733 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
734 }
735 break;
736 }
737
738 case JVM_CONSTANT_Integer:
739 assert(cache_index == _no_index_sentinel, "should not have been set");
740 prim_value.i = this_cp->int_at(index);
741 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
742 break;
743
744 case JVM_CONSTANT_Float:
745 assert(cache_index == _no_index_sentinel, "should not have been set");
746 prim_value.f = this_cp->float_at(index);
747 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
748 break;
749
750 case JVM_CONSTANT_Long:
751 assert(cache_index == _no_index_sentinel, "should not have been set");
752 prim_value.j = this_cp->long_at(index);
753 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
754 break;
755
756 case JVM_CONSTANT_Double:
757 assert(cache_index == _no_index_sentinel, "should not have been set");
758 prim_value.d = this_cp->double_at(index);
759 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
760 break;
761
762 default:
763 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
764 this_cp(), index, cache_index, tag.value()));
765 assert(false, "unexpected constant tag");
766 break;
767 }
768
769 if (cache_index >= 0) {
770 // Benign race condition: resolved_references may already be filled in.
771 // The important thing here is that all threads pick up the same result.
772 // It doesn't matter which racing thread wins, as long as only one
773 // result is used by all threads, and all future queries.
774 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL);
775 if (old_result == NULL) {
776 return result_oop; // was installed
777 } else {
778 // Return the winning thread's result. This can be different than
779 // the result here for MethodHandles.
780 return old_result;
781 }
782 } else {
783 return result_oop;
784 }
785 }
786
787 oop ConstantPool::uncached_string_at(int which, TRAPS) {
788 Symbol* sym = unresolved_string_at(which);
789 oop str = StringTable::intern(sym, CHECK_(NULL));
790 assert(java_lang_String::is_instance(str), "must be string");
791 return str;
792 }
793
794
795 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) {
796 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
797
798 Handle bsm;
799 int argc;
800 {
801 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
802 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
803 // It is accompanied by the optional arguments.
804 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
805 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
806 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
807 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
808 }
809
810 // Extract the optional static arguments.
811 argc = this_cp->invoke_dynamic_argument_count_at(index);
812 if (argc == 0) return bsm_oop;
813
814 bsm = Handle(THREAD, bsm_oop);
815 }
816
817 objArrayHandle info;
818 {
819 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
820 info = objArrayHandle(THREAD, info_oop);
821 }
822
823 info->obj_at_put(0, bsm());
824 for (int i = 0; i < argc; i++) {
825 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
826 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
827 info->obj_at_put(1+i, arg_oop);
828 }
829
830 return info();
831 }
832
833 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
834 // If the string has already been interned, this entry will be non-null
835 oop str = this_cp->resolved_references()->obj_at(obj_index);
836 if (str != NULL) return str;
837 Symbol* sym = this_cp->unresolved_string_at(which);
838 str = StringTable::intern(sym, CHECK_(NULL));
839 this_cp->string_at_put(which, obj_index, str);
840 assert(java_lang_String::is_instance(str), "must be string");
841 return str;
842 }
843
844
845 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
846 int which) {
847 // Names are interned, so we can compare Symbol*s directly
848 Symbol* cp_name = klass_name_at(which);
849 return (cp_name == k->name());
850 }
851
852
853 // Iterate over symbols and decrement ones which are Symbol*s
854 // This is done during GC.
855 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
856 // these symbols but didn't increment the reference count.
857 void ConstantPool::unreference_symbols() {
858 for (int index = 1; index < length(); index++) { // Index 0 is unused
859 constantTag tag = tag_at(index);
860 if (tag.is_symbol()) {
861 symbol_at(index)->decrement_refcount();
862 }
863 }
864 }
865
866
867 // Compare this constant pool's entry at index1 to the constant pool
868 // cp2's entry at index2.
869 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
870 int index2, TRAPS) {
871
872 // The error tags are equivalent to non-error tags when comparing
873 jbyte t1 = tag_at(index1).non_error_value();
874 jbyte t2 = cp2->tag_at(index2).non_error_value();
875
876 if (t1 != t2) {
877 // Not the same entry type so there is nothing else to check. Note
878 // that this style of checking will consider resolved/unresolved
879 // class pairs as different.
880 // From the ConstantPool* API point of view, this is correct
881 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
882 // plays out in the context of ConstantPool* merging.
883 return false;
884 }
885
886 switch (t1) {
887 case JVM_CONSTANT_Class:
888 {
889 Klass* k1 = klass_at(index1, CHECK_false);
890 Klass* k2 = cp2->klass_at(index2, CHECK_false);
891 if (k1 == k2) {
892 return true;
893 }
894 } break;
895
896 case JVM_CONSTANT_ClassIndex:
897 {
898 int recur1 = klass_index_at(index1);
899 int recur2 = cp2->klass_index_at(index2);
900 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
901 if (match) {
902 return true;
903 }
904 } break;
905
906 case JVM_CONSTANT_Double:
907 {
908 jdouble d1 = double_at(index1);
909 jdouble d2 = cp2->double_at(index2);
910 if (d1 == d2) {
911 return true;
912 }
913 } break;
914
915 case JVM_CONSTANT_Fieldref:
916 case JVM_CONSTANT_InterfaceMethodref:
917 case JVM_CONSTANT_Methodref:
918 {
919 int recur1 = uncached_klass_ref_index_at(index1);
920 int recur2 = cp2->uncached_klass_ref_index_at(index2);
921 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
922 if (match) {
923 recur1 = uncached_name_and_type_ref_index_at(index1);
924 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
925 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
926 if (match) {
927 return true;
928 }
929 }
930 } break;
931
932 case JVM_CONSTANT_Float:
933 {
934 jfloat f1 = float_at(index1);
935 jfloat f2 = cp2->float_at(index2);
936 if (f1 == f2) {
937 return true;
938 }
939 } break;
940
941 case JVM_CONSTANT_Integer:
942 {
943 jint i1 = int_at(index1);
944 jint i2 = cp2->int_at(index2);
945 if (i1 == i2) {
946 return true;
947 }
948 } break;
949
950 case JVM_CONSTANT_Long:
951 {
952 jlong l1 = long_at(index1);
953 jlong l2 = cp2->long_at(index2);
954 if (l1 == l2) {
955 return true;
956 }
957 } break;
958
959 case JVM_CONSTANT_NameAndType:
960 {
961 int recur1 = name_ref_index_at(index1);
962 int recur2 = cp2->name_ref_index_at(index2);
963 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
964 if (match) {
965 recur1 = signature_ref_index_at(index1);
966 recur2 = cp2->signature_ref_index_at(index2);
967 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
968 if (match) {
969 return true;
970 }
971 }
972 } break;
973
974 case JVM_CONSTANT_StringIndex:
975 {
976 int recur1 = string_index_at(index1);
977 int recur2 = cp2->string_index_at(index2);
978 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
979 if (match) {
980 return true;
981 }
982 } break;
983
984 case JVM_CONSTANT_UnresolvedClass:
985 {
986 Symbol* k1 = klass_name_at(index1);
987 Symbol* k2 = cp2->klass_name_at(index2);
988 if (k1 == k2) {
989 return true;
990 }
991 } break;
992
993 case JVM_CONSTANT_MethodType:
994 {
995 int k1 = method_type_index_at_error_ok(index1);
996 int k2 = cp2->method_type_index_at_error_ok(index2);
997 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
998 if (match) {
999 return true;
1000 }
1001 } break;
1002
1003 case JVM_CONSTANT_MethodHandle:
1004 {
1005 int k1 = method_handle_ref_kind_at_error_ok(index1);
1006 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2);
1007 if (k1 == k2) {
1008 int i1 = method_handle_index_at_error_ok(index1);
1009 int i2 = cp2->method_handle_index_at_error_ok(index2);
1010 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1011 if (match) {
1012 return true;
1013 }
1014 }
1015 } break;
1016
1017 case JVM_CONSTANT_InvokeDynamic:
1018 {
1019 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1020 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1021 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1022 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1023 // separate statements and variables because CHECK_false is used
1024 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1025 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1026 return (match_entry && match_operand);
1027 } break;
1028
1029 case JVM_CONSTANT_String:
1030 {
1031 Symbol* s1 = unresolved_string_at(index1);
1032 Symbol* s2 = cp2->unresolved_string_at(index2);
1033 if (s1 == s2) {
1034 return true;
1035 }
1036 } break;
1037
1038 case JVM_CONSTANT_Utf8:
1039 {
1040 Symbol* s1 = symbol_at(index1);
1041 Symbol* s2 = cp2->symbol_at(index2);
1042 if (s1 == s2) {
1043 return true;
1044 }
1045 } break;
1046
1047 // Invalid is used as the tag for the second constant pool entry
1048 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1049 // not be seen by itself.
1050 case JVM_CONSTANT_Invalid: // fall through
1051
1052 default:
1053 ShouldNotReachHere();
1054 break;
1055 }
1056
1057 return false;
1058 } // end compare_entry_to()
1059
1060
1061 // Resize the operands array with delta_len and delta_size.
1062 // Used in RedefineClasses for CP merge.
1063 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1064 int old_len = operand_array_length(operands());
1065 int new_len = old_len + delta_len;
1066 int min_len = (delta_len > 0) ? old_len : new_len;
1067
1068 int old_size = operands()->length();
1069 int new_size = old_size + delta_size;
1070 int min_size = (delta_size > 0) ? old_size : new_size;
1071
1072 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1073 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1074
1075 // Set index in the resized array for existing elements only
1076 for (int idx = 0; idx < min_len; idx++) {
1077 int offset = operand_offset_at(idx); // offset in original array
1078 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1079 }
1080 // Copy the bootstrap specifiers only
1081 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1082 new_ops->adr_at(2*new_len),
1083 (min_size - 2*min_len) * sizeof(u2));
1084 // Explicitly deallocate old operands array.
1085 // Note, it is not needed for 7u backport.
1086 if ( operands() != NULL) { // the safety check
1087 MetadataFactory::free_array<u2>(loader_data, operands());
1088 }
1089 set_operands(new_ops);
1090 } // end resize_operands()
1091
1092
1093 // Extend the operands array with the length and size of the ext_cp operands.
1094 // Used in RedefineClasses for CP merge.
1095 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1096 int delta_len = operand_array_length(ext_cp->operands());
1097 if (delta_len == 0) {
1098 return; // nothing to do
1099 }
1100 int delta_size = ext_cp->operands()->length();
1101
1102 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1103
1104 if (operand_array_length(operands()) == 0) {
1105 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1106 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1107 // The first element index defines the offset of second part
1108 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1109 set_operands(new_ops);
1110 } else {
1111 resize_operands(delta_len, delta_size, CHECK);
1112 }
1113
1114 } // end extend_operands()
1115
1116
1117 // Shrink the operands array to a smaller array with new_len length.
1118 // Used in RedefineClasses for CP merge.
1119 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1120 int old_len = operand_array_length(operands());
1121 if (new_len == old_len) {
1122 return; // nothing to do
1123 }
1124 assert(new_len < old_len, "shrunken operands array must be smaller");
1125
1126 int free_base = operand_next_offset_at(new_len - 1);
1127 int delta_len = new_len - old_len;
1128 int delta_size = 2*delta_len + free_base - operands()->length();
1129
1130 resize_operands(delta_len, delta_size, CHECK);
1131
1132 } // end shrink_operands()
1133
1134
1135 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1136 const constantPoolHandle& to_cp,
1137 TRAPS) {
1138
1139 int from_oplen = operand_array_length(from_cp->operands());
1140 int old_oplen = operand_array_length(to_cp->operands());
1141 if (from_oplen != 0) {
1142 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1143 // append my operands to the target's operands array
1144 if (old_oplen == 0) {
1145 // Can't just reuse from_cp's operand list because of deallocation issues
1146 int len = from_cp->operands()->length();
1147 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1148 Copy::conjoint_memory_atomic(
1149 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1150 to_cp->set_operands(new_ops);
1151 } else {
1152 int old_len = to_cp->operands()->length();
1153 int from_len = from_cp->operands()->length();
1154 int old_off = old_oplen * sizeof(u2);
1155 int from_off = from_oplen * sizeof(u2);
1156 // Use the metaspace for the destination constant pool
1157 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1158 int fillp = 0, len = 0;
1159 // first part of dest
1160 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1161 new_operands->adr_at(fillp),
1162 (len = old_off) * sizeof(u2));
1163 fillp += len;
1164 // first part of src
1165 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1166 new_operands->adr_at(fillp),
1167 (len = from_off) * sizeof(u2));
1168 fillp += len;
1169 // second part of dest
1170 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1171 new_operands->adr_at(fillp),
1172 (len = old_len - old_off) * sizeof(u2));
1173 fillp += len;
1174 // second part of src
1175 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1176 new_operands->adr_at(fillp),
1177 (len = from_len - from_off) * sizeof(u2));
1178 fillp += len;
1179 assert(fillp == new_operands->length(), "");
1180
1181 // Adjust indexes in the first part of the copied operands array.
1182 for (int j = 0; j < from_oplen; j++) {
1183 int offset = operand_offset_at(new_operands, old_oplen + j);
1184 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1185 offset += old_len; // every new tuple is preceded by old_len extra u2's
1186 operand_offset_at_put(new_operands, old_oplen + j, offset);
1187 }
1188
1189 // replace target operands array with combined array
1190 to_cp->set_operands(new_operands);
1191 }
1192 }
1193 } // end copy_operands()
1194
1195
1196 // Copy this constant pool's entries at start_i to end_i (inclusive)
1197 // to the constant pool to_cp's entries starting at to_i. A total of
1198 // (end_i - start_i) + 1 entries are copied.
1199 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1200 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1201
1202
1203 int dest_i = to_i; // leave original alone for debug purposes
1204
1205 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1206 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1207
1208 switch (from_cp->tag_at(src_i).value()) {
1209 case JVM_CONSTANT_Double:
1210 case JVM_CONSTANT_Long:
1211 // double and long take two constant pool entries
1212 src_i += 2;
1213 dest_i += 2;
1214 break;
1215
1216 default:
1217 // all others take one constant pool entry
1218 src_i++;
1219 dest_i++;
1220 break;
1221 }
1222 }
1223 copy_operands(from_cp, to_cp, CHECK);
1224
1225 } // end copy_cp_to_impl()
1226
1227
1228 // Copy this constant pool's entry at from_i to the constant pool
1229 // to_cp's entry at to_i.
1230 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1231 const constantPoolHandle& to_cp, int to_i,
1232 TRAPS) {
1233
1234 int tag = from_cp->tag_at(from_i).value();
1235 switch (tag) {
1236 case JVM_CONSTANT_Class:
1237 {
1238 Klass* k = from_cp->klass_at(from_i, CHECK);
1239 to_cp->klass_at_put(to_i, k);
1240 } break;
1241
1242 case JVM_CONSTANT_ClassIndex:
1243 {
1244 jint ki = from_cp->klass_index_at(from_i);
1245 to_cp->klass_index_at_put(to_i, ki);
1246 } break;
1247
1248 case JVM_CONSTANT_Double:
1249 {
1250 jdouble d = from_cp->double_at(from_i);
1251 to_cp->double_at_put(to_i, d);
1252 // double takes two constant pool entries so init second entry's tag
1253 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1254 } break;
1255
1256 case JVM_CONSTANT_Fieldref:
1257 {
1258 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1259 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1260 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1261 } break;
1262
1263 case JVM_CONSTANT_Float:
1264 {
1265 jfloat f = from_cp->float_at(from_i);
1266 to_cp->float_at_put(to_i, f);
1267 } break;
1268
1269 case JVM_CONSTANT_Integer:
1270 {
1271 jint i = from_cp->int_at(from_i);
1272 to_cp->int_at_put(to_i, i);
1273 } break;
1274
1275 case JVM_CONSTANT_InterfaceMethodref:
1276 {
1277 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1278 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1279 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1280 } break;
1281
1282 case JVM_CONSTANT_Long:
1283 {
1284 jlong l = from_cp->long_at(from_i);
1285 to_cp->long_at_put(to_i, l);
1286 // long takes two constant pool entries so init second entry's tag
1287 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1288 } break;
1289
1290 case JVM_CONSTANT_Methodref:
1291 {
1292 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1293 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1294 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1295 } break;
1296
1297 case JVM_CONSTANT_NameAndType:
1298 {
1299 int name_ref_index = from_cp->name_ref_index_at(from_i);
1300 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1301 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1302 } break;
1303
1304 case JVM_CONSTANT_StringIndex:
1305 {
1306 jint si = from_cp->string_index_at(from_i);
1307 to_cp->string_index_at_put(to_i, si);
1308 } break;
1309
1310 case JVM_CONSTANT_UnresolvedClass:
1311 case JVM_CONSTANT_UnresolvedClassInError:
1312 {
1313 // Can be resolved after checking tag, so check the slot first.
1314 CPSlot entry = from_cp->slot_at(from_i);
1315 if (entry.is_resolved()) {
1316 assert(entry.get_klass()->is_klass(), "must be");
1317 // Already resolved
1318 to_cp->klass_at_put(to_i, entry.get_klass());
1319 } else {
1320 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1321 }
1322 } break;
1323
1324 case JVM_CONSTANT_String:
1325 {
1326 Symbol* s = from_cp->unresolved_string_at(from_i);
1327 to_cp->unresolved_string_at_put(to_i, s);
1328 } break;
1329
1330 case JVM_CONSTANT_Utf8:
1331 {
1332 Symbol* s = from_cp->symbol_at(from_i);
1333 // Need to increase refcount, the old one will be thrown away and deferenced
1334 s->increment_refcount();
1335 to_cp->symbol_at_put(to_i, s);
1336 } break;
1337
1338 case JVM_CONSTANT_MethodType:
1339 case JVM_CONSTANT_MethodTypeInError:
1340 {
1341 jint k = from_cp->method_type_index_at_error_ok(from_i);
1342 to_cp->method_type_index_at_put(to_i, k);
1343 } break;
1344
1345 case JVM_CONSTANT_MethodHandle:
1346 case JVM_CONSTANT_MethodHandleInError:
1347 {
1348 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i);
1349 int k2 = from_cp->method_handle_index_at_error_ok(from_i);
1350 to_cp->method_handle_index_at_put(to_i, k1, k2);
1351 } break;
1352
1353 case JVM_CONSTANT_InvokeDynamic:
1354 {
1355 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1356 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1357 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1358 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1359 } break;
1360
1361 // Invalid is used as the tag for the second constant pool entry
1362 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1363 // not be seen by itself.
1364 case JVM_CONSTANT_Invalid: // fall through
1365
1366 default:
1367 {
1368 ShouldNotReachHere();
1369 } break;
1370 }
1371 } // end copy_entry_to()
1372
1373
1374 // Search constant pool search_cp for an entry that matches this
1375 // constant pool's entry at pattern_i. Returns the index of a
1376 // matching entry or zero (0) if there is no matching entry.
1377 int ConstantPool::find_matching_entry(int pattern_i,
1378 const constantPoolHandle& search_cp, TRAPS) {
1379
1380 // index zero (0) is not used
1381 for (int i = 1; i < search_cp->length(); i++) {
1382 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1383 if (found) {
1384 return i;
1385 }
1386 }
1387
1388 return 0; // entry not found; return unused index zero (0)
1389 } // end find_matching_entry()
1390
1391
1392 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1393 // cp2's bootstrap specifier at idx2.
1394 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1395 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1396 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1397 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1398
1399 if (!match) {
1400 return false;
1401 }
1402 int argc = operand_argument_count_at(idx1);
1403 if (argc == cp2->operand_argument_count_at(idx2)) {
1404 for (int j = 0; j < argc; j++) {
1405 k1 = operand_argument_index_at(idx1, j);
1406 k2 = cp2->operand_argument_index_at(idx2, j);
1407 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1408 if (!match) {
1409 return false;
1410 }
1411 }
1412 return true; // got through loop; all elements equal
1413 }
1414 return false;
1415 } // end compare_operand_to()
1416
1417 // Search constant pool search_cp for a bootstrap specifier that matches
1418 // this constant pool's bootstrap specifier at pattern_i index.
1419 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1420 int ConstantPool::find_matching_operand(int pattern_i,
1421 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1422 for (int i = 0; i < search_len; i++) {
1423 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1424 if (found) {
1425 return i;
1426 }
1427 }
1428 return -1; // bootstrap specifier not found; return unused index (-1)
1429 } // end find_matching_operand()
1430
1431
1432 #ifndef PRODUCT
1433
1434 const char* ConstantPool::printable_name_at(int which) {
1435
1436 constantTag tag = tag_at(which);
1437
1438 if (tag.is_string()) {
1439 return string_at_noresolve(which);
1440 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1441 return klass_name_at(which)->as_C_string();
1442 } else if (tag.is_symbol()) {
1443 return symbol_at(which)->as_C_string();
1444 }
1445 return "";
1446 }
1447
1448 #endif // PRODUCT
1449
1450
1451 // JVMTI GetConstantPool support
1452
1453 // For debugging of constant pool
1454 const bool debug_cpool = false;
1455
1456 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1457
1458 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1459 const char* WARN_MSG = "Must not be such entry!";
1460 jint size = 0;
1461 u2 idx1, idx2;
1462
1463 for (jint idx = 1; idx < cnt; idx++) {
1464 jint ent_size = 0;
1465 u1 tag = *bytes++;
1466 size++; // count tag
1467
1468 printf("const #%03d, tag: %02d ", idx, tag);
1469 switch(tag) {
1470 case JVM_CONSTANT_Invalid: {
1471 printf("Invalid");
1472 break;
1473 }
1474 case JVM_CONSTANT_Unicode: {
1475 printf("Unicode %s", WARN_MSG);
1476 break;
1477 }
1478 case JVM_CONSTANT_Utf8: {
1479 u2 len = Bytes::get_Java_u2(bytes);
1480 char str[128];
1481 if (len > 127) {
1482 len = 127;
1483 }
1484 strncpy(str, (char *) (bytes+2), len);
1485 str[len] = '\0';
1486 printf("Utf8 \"%s\"", str);
1487 ent_size = 2 + len;
1488 break;
1489 }
1490 case JVM_CONSTANT_Integer: {
1491 u4 val = Bytes::get_Java_u4(bytes);
1492 printf("int %d", *(int *) &val);
1493 ent_size = 4;
1494 break;
1495 }
1496 case JVM_CONSTANT_Float: {
1497 u4 val = Bytes::get_Java_u4(bytes);
1498 printf("float %5.3ff", *(float *) &val);
1499 ent_size = 4;
1500 break;
1501 }
1502 case JVM_CONSTANT_Long: {
1503 u8 val = Bytes::get_Java_u8(bytes);
1504 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1505 ent_size = 8;
1506 idx++; // Long takes two cpool slots
1507 break;
1508 }
1509 case JVM_CONSTANT_Double: {
1510 u8 val = Bytes::get_Java_u8(bytes);
1511 printf("double %5.3fd", *(jdouble *)&val);
1512 ent_size = 8;
1513 idx++; // Double takes two cpool slots
1514 break;
1515 }
1516 case JVM_CONSTANT_Class: {
1517 idx1 = Bytes::get_Java_u2(bytes);
1518 printf("class #%03d", idx1);
1519 ent_size = 2;
1520 break;
1521 }
1522 case JVM_CONSTANT_String: {
1523 idx1 = Bytes::get_Java_u2(bytes);
1524 printf("String #%03d", idx1);
1525 ent_size = 2;
1526 break;
1527 }
1528 case JVM_CONSTANT_Fieldref: {
1529 idx1 = Bytes::get_Java_u2(bytes);
1530 idx2 = Bytes::get_Java_u2(bytes+2);
1531 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1532 ent_size = 4;
1533 break;
1534 }
1535 case JVM_CONSTANT_Methodref: {
1536 idx1 = Bytes::get_Java_u2(bytes);
1537 idx2 = Bytes::get_Java_u2(bytes+2);
1538 printf("Method #%03d, #%03d", idx1, idx2);
1539 ent_size = 4;
1540 break;
1541 }
1542 case JVM_CONSTANT_InterfaceMethodref: {
1543 idx1 = Bytes::get_Java_u2(bytes);
1544 idx2 = Bytes::get_Java_u2(bytes+2);
1545 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1546 ent_size = 4;
1547 break;
1548 }
1549 case JVM_CONSTANT_NameAndType: {
1550 idx1 = Bytes::get_Java_u2(bytes);
1551 idx2 = Bytes::get_Java_u2(bytes+2);
1552 printf("NameAndType #%03d, #%03d", idx1, idx2);
1553 ent_size = 4;
1554 break;
1555 }
1556 case JVM_CONSTANT_ClassIndex: {
1557 printf("ClassIndex %s", WARN_MSG);
1558 break;
1559 }
1560 case JVM_CONSTANT_UnresolvedClass: {
1561 printf("UnresolvedClass: %s", WARN_MSG);
1562 break;
1563 }
1564 case JVM_CONSTANT_UnresolvedClassInError: {
1565 printf("UnresolvedClassInErr: %s", WARN_MSG);
1566 break;
1567 }
1568 case JVM_CONSTANT_StringIndex: {
1569 printf("StringIndex: %s", WARN_MSG);
1570 break;
1571 }
1572 }
1573 printf(";\n");
1574 bytes += ent_size;
1575 size += ent_size;
1576 }
1577 printf("Cpool size: %d\n", size);
1578 fflush(0);
1579 return;
1580 } /* end print_cpool_bytes */
1581
1582
1583 // Returns size of constant pool entry.
1584 jint ConstantPool::cpool_entry_size(jint idx) {
1585 switch(tag_at(idx).value()) {
1586 case JVM_CONSTANT_Invalid:
1587 case JVM_CONSTANT_Unicode:
1588 return 1;
1589
1590 case JVM_CONSTANT_Utf8:
1591 return 3 + symbol_at(idx)->utf8_length();
1592
1593 case JVM_CONSTANT_Class:
1594 case JVM_CONSTANT_String:
1595 case JVM_CONSTANT_ClassIndex:
1596 case JVM_CONSTANT_UnresolvedClass:
1597 case JVM_CONSTANT_UnresolvedClassInError:
1598 case JVM_CONSTANT_StringIndex:
1599 case JVM_CONSTANT_MethodType:
1600 case JVM_CONSTANT_MethodTypeInError:
1601 return 3;
1602
1603 case JVM_CONSTANT_MethodHandle:
1604 case JVM_CONSTANT_MethodHandleInError:
1605 return 4; //tag, ref_kind, ref_index
1606
1607 case JVM_CONSTANT_Integer:
1608 case JVM_CONSTANT_Float:
1609 case JVM_CONSTANT_Fieldref:
1610 case JVM_CONSTANT_Methodref:
1611 case JVM_CONSTANT_InterfaceMethodref:
1612 case JVM_CONSTANT_NameAndType:
1613 return 5;
1614
1615 case JVM_CONSTANT_InvokeDynamic:
1616 // u1 tag, u2 bsm, u2 nt
1617 return 5;
1618
1619 case JVM_CONSTANT_Long:
1620 case JVM_CONSTANT_Double:
1621 return 9;
1622 }
1623 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1624 return 1;
1625 } /* end cpool_entry_size */
1626
1627
1628 // SymbolHashMap is used to find a constant pool index from a string.
1629 // This function fills in SymbolHashMaps, one for utf8s and one for
1630 // class names, returns size of the cpool raw bytes.
1631 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1632 SymbolHashMap *classmap) {
1633 jint size = 0;
1634
1635 for (u2 idx = 1; idx < length(); idx++) {
1636 u2 tag = tag_at(idx).value();
1637 size += cpool_entry_size(idx);
1638
1639 switch(tag) {
1640 case JVM_CONSTANT_Utf8: {
1641 Symbol* sym = symbol_at(idx);
1642 symmap->add_entry(sym, idx);
1643 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1644 break;
1645 }
1646 case JVM_CONSTANT_Class:
1647 case JVM_CONSTANT_UnresolvedClass:
1648 case JVM_CONSTANT_UnresolvedClassInError: {
1649 Symbol* sym = klass_name_at(idx);
1650 classmap->add_entry(sym, idx);
1651 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1652 break;
1653 }
1654 case JVM_CONSTANT_Long:
1655 case JVM_CONSTANT_Double: {
1656 idx++; // Both Long and Double take two cpool slots
1657 break;
1658 }
1659 }
1660 }
1661 return size;
1662 } /* end hash_utf8_entries_to */
1663
1664
1665 // Copy cpool bytes.
1666 // Returns:
1667 // 0, in case of OutOfMemoryError
1668 // -1, in case of internal error
1669 // > 0, count of the raw cpool bytes that have been copied
1670 int ConstantPool::copy_cpool_bytes(int cpool_size,
1671 SymbolHashMap* tbl,
1672 unsigned char *bytes) {
1673 u2 idx1, idx2;
1674 jint size = 0;
1675 jint cnt = length();
1676 unsigned char *start_bytes = bytes;
1677
1678 for (jint idx = 1; idx < cnt; idx++) {
1679 u1 tag = tag_at(idx).value();
1680 jint ent_size = cpool_entry_size(idx);
1681
1682 assert(size + ent_size <= cpool_size, "Size mismatch");
1683
1684 *bytes = tag;
1685 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1686 switch(tag) {
1687 case JVM_CONSTANT_Invalid: {
1688 DBG(printf("JVM_CONSTANT_Invalid"));
1689 break;
1690 }
1691 case JVM_CONSTANT_Unicode: {
1692 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1693 DBG(printf("JVM_CONSTANT_Unicode"));
1694 break;
1695 }
1696 case JVM_CONSTANT_Utf8: {
1697 Symbol* sym = symbol_at(idx);
1698 char* str = sym->as_utf8();
1699 // Warning! It's crashing on x86 with len = sym->utf8_length()
1700 int len = (int) strlen(str);
1701 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1702 for (int i = 0; i < len; i++) {
1703 bytes[3+i] = (u1) str[i];
1704 }
1705 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1706 break;
1707 }
1708 case JVM_CONSTANT_Integer: {
1709 jint val = int_at(idx);
1710 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1711 break;
1712 }
1713 case JVM_CONSTANT_Float: {
1714 jfloat val = float_at(idx);
1715 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1716 break;
1717 }
1718 case JVM_CONSTANT_Long: {
1719 jlong val = long_at(idx);
1720 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1721 idx++; // Long takes two cpool slots
1722 break;
1723 }
1724 case JVM_CONSTANT_Double: {
1725 jdouble val = double_at(idx);
1726 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1727 idx++; // Double takes two cpool slots
1728 break;
1729 }
1730 case JVM_CONSTANT_Class:
1731 case JVM_CONSTANT_UnresolvedClass:
1732 case JVM_CONSTANT_UnresolvedClassInError: {
1733 *bytes = JVM_CONSTANT_Class;
1734 Symbol* sym = klass_name_at(idx);
1735 idx1 = tbl->symbol_to_value(sym);
1736 assert(idx1 != 0, "Have not found a hashtable entry");
1737 Bytes::put_Java_u2((address) (bytes+1), idx1);
1738 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1739 break;
1740 }
1741 case JVM_CONSTANT_String: {
1742 *bytes = JVM_CONSTANT_String;
1743 Symbol* sym = unresolved_string_at(idx);
1744 idx1 = tbl->symbol_to_value(sym);
1745 assert(idx1 != 0, "Have not found a hashtable entry");
1746 Bytes::put_Java_u2((address) (bytes+1), idx1);
1747 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1748 break;
1749 }
1750 case JVM_CONSTANT_Fieldref:
1751 case JVM_CONSTANT_Methodref:
1752 case JVM_CONSTANT_InterfaceMethodref: {
1753 idx1 = uncached_klass_ref_index_at(idx);
1754 idx2 = uncached_name_and_type_ref_index_at(idx);
1755 Bytes::put_Java_u2((address) (bytes+1), idx1);
1756 Bytes::put_Java_u2((address) (bytes+3), idx2);
1757 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1758 break;
1759 }
1760 case JVM_CONSTANT_NameAndType: {
1761 idx1 = name_ref_index_at(idx);
1762 idx2 = signature_ref_index_at(idx);
1763 Bytes::put_Java_u2((address) (bytes+1), idx1);
1764 Bytes::put_Java_u2((address) (bytes+3), idx2);
1765 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1766 break;
1767 }
1768 case JVM_CONSTANT_ClassIndex: {
1769 *bytes = JVM_CONSTANT_Class;
1770 idx1 = klass_index_at(idx);
1771 Bytes::put_Java_u2((address) (bytes+1), idx1);
1772 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1773 break;
1774 }
1775 case JVM_CONSTANT_StringIndex: {
1776 *bytes = JVM_CONSTANT_String;
1777 idx1 = string_index_at(idx);
1778 Bytes::put_Java_u2((address) (bytes+1), idx1);
1779 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1780 break;
1781 }
1782 case JVM_CONSTANT_MethodHandle:
1783 case JVM_CONSTANT_MethodHandleInError: {
1784 *bytes = JVM_CONSTANT_MethodHandle;
1785 int kind = method_handle_ref_kind_at_error_ok(idx);
1786 idx1 = method_handle_index_at_error_ok(idx);
1787 *(bytes+1) = (unsigned char) kind;
1788 Bytes::put_Java_u2((address) (bytes+2), idx1);
1789 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1790 break;
1791 }
1792 case JVM_CONSTANT_MethodType:
1793 case JVM_CONSTANT_MethodTypeInError: {
1794 *bytes = JVM_CONSTANT_MethodType;
1795 idx1 = method_type_index_at_error_ok(idx);
1796 Bytes::put_Java_u2((address) (bytes+1), idx1);
1797 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1798 break;
1799 }
1800 case JVM_CONSTANT_InvokeDynamic: {
1801 *bytes = tag;
1802 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1803 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1804 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1805 Bytes::put_Java_u2((address) (bytes+1), idx1);
1806 Bytes::put_Java_u2((address) (bytes+3), idx2);
1807 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1808 break;
1809 }
1810 }
1811 DBG(printf("\n"));
1812 bytes += ent_size;
1813 size += ent_size;
1814 }
1815 assert(size == cpool_size, "Size mismatch");
1816
1817 // Keep temorarily for debugging until it's stable.
1818 DBG(print_cpool_bytes(cnt, start_bytes));
1819 return (int)(bytes - start_bytes);
1820 } /* end copy_cpool_bytes */
1821
1822 #undef DBG
1823
1824
1825 void ConstantPool::set_on_stack(const bool value) {
1826 if (value) {
1827 // Only record if it's not already set.
1828 if (!on_stack()) {
1829 _flags |= _on_stack;
1830 MetadataOnStackMark::record(this);
1831 }
1832 } else {
1833 // Clearing is done single-threadedly.
1834 _flags &= ~_on_stack;
1835 }
1836 }
1837
1838 // JSR 292 support for patching constant pool oops after the class is linked and
1839 // the oop array for resolved references are created.
1840 // We can't do this during classfile parsing, which is how the other indexes are
1841 // patched. The other patches are applied early for some error checking
1842 // so only defer the pseudo_strings.
1843 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
1844 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1845 Handle patch = cp_patches->at(index);
1846 if (patch.not_null()) {
1847 assert (tag_at(index).is_string(), "should only be string left");
1848 // Patching a string means pre-resolving it.
1849 // The spelling in the constant pool is ignored.
1850 // The constant reference may be any object whatever.
1851 // If it is not a real interned string, the constant is referred
1852 // to as a "pseudo-string", and must be presented to the CP
1853 // explicitly, because it may require scavenging.
1854 int obj_index = cp_to_object_index(index);
1855 pseudo_string_at_put(index, obj_index, patch());
1856 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1857 }
1858 }
1859 #ifdef ASSERT
1860 // Ensure that all the patches have been used.
1861 for (int index = 0; index < cp_patches->length(); index++) {
1862 assert(cp_patches->at(index).is_null(),
1863 "Unused constant pool patch at %d in class file %s",
1864 index,
1865 pool_holder()->external_name());
1866 }
1867 #endif // ASSERT
1868 }
1869
1870 #ifndef PRODUCT
1871
1872 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1873 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1874 guarantee(obj->is_constantPool(), "object must be constant pool");
1875 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1876 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1877
1878 for (int i = 0; i< cp->length(); i++) {
1879 if (cp->tag_at(i).is_unresolved_klass()) {
1880 // This will force loading of the class
1881 Klass* klass = cp->klass_at(i, CHECK);
1882 if (klass->is_instance_klass()) {
1883 // Force initialization of class
1884 InstanceKlass::cast(klass)->initialize(CHECK);
1885 }
1886 }
1887 }
1888 }
1889
1890 #endif
1891
1892
1893 // Printing
1894
1895 void ConstantPool::print_on(outputStream* st) const {
1896 assert(is_constantPool(), "must be constantPool");
1897 st->print_cr("%s", internal_name());
1898 if (flags() != 0) {
1899 st->print(" - flags: 0x%x", flags());
1900 if (has_preresolution()) st->print(" has_preresolution");
1901 if (on_stack()) st->print(" on_stack");
1902 st->cr();
1903 }
1904 if (pool_holder() != NULL) {
1905 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
1906 }
1907 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
1908 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
1909 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
1910
1911 for (int index = 1; index < length(); index++) { // Index 0 is unused
1912 ((ConstantPool*)this)->print_entry_on(index, st);
1913 switch (tag_at(index).value()) {
1914 case JVM_CONSTANT_Long :
1915 case JVM_CONSTANT_Double :
1916 index++; // Skip entry following eigth-byte constant
1917 }
1918
1919 }
1920 st->cr();
1921 }
1922
1923 // Print one constant pool entry
1924 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1925 EXCEPTION_MARK;
1926 st->print(" - %3d : ", index);
1927 tag_at(index).print_on(st);
1928 st->print(" : ");
1929 switch (tag_at(index).value()) {
1930 case JVM_CONSTANT_Class :
1931 { Klass* k = klass_at(index, CATCH);
1932 guarantee(k != NULL, "need klass");
1933 k->print_value_on(st);
1934 st->print(" {" PTR_FORMAT "}", p2i(k));
1935 }
1936 break;
1937 case JVM_CONSTANT_Fieldref :
1938 case JVM_CONSTANT_Methodref :
1939 case JVM_CONSTANT_InterfaceMethodref :
1940 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1941 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1942 break;
1943 case JVM_CONSTANT_String :
1944 if (is_pseudo_string_at(index)) {
1945 oop anObj = pseudo_string_at(index);
1946 anObj->print_value_on(st);
1947 st->print(" {" PTR_FORMAT "}", p2i(anObj));
1948 } else {
1949 unresolved_string_at(index)->print_value_on(st);
1950 }
1951 break;
1952 case JVM_CONSTANT_Integer :
1953 st->print("%d", int_at(index));
1954 break;
1955 case JVM_CONSTANT_Float :
1956 st->print("%f", float_at(index));
1957 break;
1958 case JVM_CONSTANT_Long :
1959 st->print_jlong(long_at(index));
1960 break;
1961 case JVM_CONSTANT_Double :
1962 st->print("%lf", double_at(index));
1963 break;
1964 case JVM_CONSTANT_NameAndType :
1965 st->print("name_index=%d", name_ref_index_at(index));
1966 st->print(" signature_index=%d", signature_ref_index_at(index));
1967 break;
1968 case JVM_CONSTANT_Utf8 :
1969 symbol_at(index)->print_value_on(st);
1970 break;
1971 case JVM_CONSTANT_UnresolvedClass : // fall-through
1972 case JVM_CONSTANT_UnresolvedClassInError: {
1973 CPSlot entry = slot_at(index);
1974 if (entry.is_resolved()) {
1975 entry.get_klass()->print_value_on(st);
1976 } else {
1977 entry.get_symbol()->print_value_on(st);
1978 }
1979 }
1980 break;
1981 case JVM_CONSTANT_MethodHandle :
1982 case JVM_CONSTANT_MethodHandleInError :
1983 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index));
1984 st->print(" ref_index=%d", method_handle_index_at_error_ok(index));
1985 break;
1986 case JVM_CONSTANT_MethodType :
1987 case JVM_CONSTANT_MethodTypeInError :
1988 st->print("signature_index=%d", method_type_index_at_error_ok(index));
1989 break;
1990 case JVM_CONSTANT_InvokeDynamic :
1991 {
1992 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1993 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1994 int argc = invoke_dynamic_argument_count_at(index);
1995 if (argc > 0) {
1996 for (int arg_i = 0; arg_i < argc; arg_i++) {
1997 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1998 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1999 }
2000 st->print("}");
2001 }
2002 }
2003 break;
2004 default:
2005 ShouldNotReachHere();
2006 break;
2007 }
2008 st->cr();
2009 }
2010
2011 void ConstantPool::print_value_on(outputStream* st) const {
2012 assert(is_constantPool(), "must be constantPool");
2013 st->print("constant pool [%d]", length());
2014 if (has_preresolution()) st->print("/preresolution");
2015 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2016 print_address_on(st);
2017 st->print(" for ");
2018 pool_holder()->print_value_on(st);
2019 if (pool_holder() != NULL) {
2020 bool extra = (pool_holder()->constants() != this);
2021 if (extra) st->print(" (extra)");
2022 }
2023 if (cache() != NULL) {
2024 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2025 }
2026 }
2027
2028 #if INCLUDE_SERVICES
2029 // Size Statistics
2030 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2031 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2032 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2033 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2034 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2035 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2036
2037 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2038 sz->_cp_refmap_bytes;
2039 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2040 }
2041 #endif // INCLUDE_SERVICES
2042
2043 // Verification
2044
2045 void ConstantPool::verify_on(outputStream* st) {
2046 guarantee(is_constantPool(), "object must be constant pool");
2047 for (int i = 0; i< length(); i++) {
2048 constantTag tag = tag_at(i);
2049 CPSlot entry = slot_at(i);
2050 if (tag.is_klass()) {
2051 if (entry.is_resolved()) {
2052 guarantee(entry.get_klass()->is_klass(), "should be klass");
2053 }
2054 } else if (tag.is_unresolved_klass()) {
2055 if (entry.is_resolved()) {
2056 guarantee(entry.get_klass()->is_klass(), "should be klass");
2057 }
2058 } else if (tag.is_symbol()) {
2059 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2060 } else if (tag.is_string()) {
2061 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2062 }
2063 }
2064 if (cache() != NULL) {
2065 // Note: cache() can be NULL before a class is completely setup or
2066 // in temporary constant pools used during constant pool merging
2067 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2068 }
2069 if (pool_holder() != NULL) {
2070 // Note: pool_holder() can be NULL in temporary constant pools
2071 // used during constant pool merging
2072 guarantee(pool_holder()->is_klass(), "should be klass");
2073 }
2074 }
2075
2076
2077 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2078 char *str = sym->as_utf8();
2079 unsigned int hash = compute_hash(str, sym->utf8_length());
2080 unsigned int index = hash % table_size();
2081
2082 // check if already in map
2083 // we prefer the first entry since it is more likely to be what was used in
2084 // the class file
2085 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2086 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2087 if (en->hash() == hash && en->symbol() == sym) {
2088 return; // already there
2089 }
2090 }
2091
2092 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2093 entry->set_next(bucket(index));
2094 _buckets[index].set_entry(entry);
2095 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2096 }
2097
2098 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2099 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2100 char *str = sym->as_utf8();
2101 int len = sym->utf8_length();
2102 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2103 unsigned int index = hash % table_size();
2104 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2105 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2106 if (en->hash() == hash && en->symbol() == sym) {
2107 return en;
2108 }
2109 }
2110 return NULL;
2111 }