1 /*
2 * Copyright (c) 1997, 2017, 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 "memory/resourceArea.hpp"
37 #include "oops/constantPool.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/objArrayKlass.hpp"
40 #include "oops/objArrayOop.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "runtime/fieldType.hpp"
43 #include "runtime/init.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/signature.hpp"
46 #include "runtime/vframe.hpp"
47 #include "utilities/copy.hpp"
48
49 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
50 // Tags are RW but comment below applies to tags also.
51 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
52
53 int size = ConstantPool::size(length);
54
55 // CDS considerations:
56 // Allocate read-write but may be able to move to read-only at dumping time
57 // if all the klasses are resolved. The only other field that is writable is
58 // the resolved_references array, which is recreated at startup time.
59 // But that could be moved to InstanceKlass (although a pain to access from
60 // assembly code). Maybe it could be moved to the cpCache which is RW.
61 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
62 }
63
64 #ifdef ASSERT
65
66 // MetaspaceObj allocation invariant is calloc equivalent memory
67 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
68 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
69 assert(tags != NULL, "invariant");
70 const int length = tags->length();
71 for (int index = 0; index < length; ++index) {
72 if (JVM_CONSTANT_Invalid != tags->at(index)) {
73 return false;
74 }
75 }
76 return true;
77 }
78
79 #endif
80
81 ConstantPool::ConstantPool(Array<u1>* tags) :
82 _tags(tags),
83 _length(tags->length()),
84 _flags(0) {
85
86 assert(_tags != NULL, "invariant");
87 assert(tags->length() == _length, "invariant");
88 assert(tag_array_is_zero_initialized(tags), "invariant");
89 assert(0 == _flags, "invariant");
90 assert(0 == version(), "invariant");
91 assert(NULL == _pool_holder, "invariant");
92 }
93
94 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
95 MetadataFactory::free_metadata(loader_data, cache());
96 set_cache(NULL);
97 MetadataFactory::free_array<u2>(loader_data, reference_map());
98 set_reference_map(NULL);
99
100 MetadataFactory::free_array<jushort>(loader_data, operands());
101 set_operands(NULL);
102
103 release_C_heap_structures();
104
105 // free tag array
106 MetadataFactory::free_array<u1>(loader_data, tags());
107 set_tags(NULL);
108 }
109
110 void ConstantPool::release_C_heap_structures() {
111 // walk constant pool and decrement symbol reference counts
112 unreference_symbols();
113 }
114
115 objArrayOop ConstantPool::resolved_references() const {
116 return (objArrayOop)JNIHandles::resolve(_resolved_references);
117 }
118
119 // Create resolved_references array and mapping array for original cp indexes
120 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
121 // to map it back for resolving and some unlikely miscellaneous uses.
122 // The objects created by invokedynamic are appended to this list.
123 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
124 const intStack& reference_map,
125 int constant_pool_map_length,
126 TRAPS) {
127 // Initialized the resolved object cache.
128 int map_length = reference_map.length();
129 if (map_length > 0) {
130 // Only need mapping back to constant pool entries. The map isn't used for
131 // invokedynamic resolved_reference entries. For invokedynamic entries,
132 // the constant pool cache index has the mapping back to both the constant
133 // pool and to the resolved reference index.
134 if (constant_pool_map_length > 0) {
135 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
136
137 for (int i = 0; i < constant_pool_map_length; i++) {
138 int x = reference_map.at(i);
139 assert(x == (int)(jushort) x, "klass index is too big");
140 om->at_put(i, (jushort)x);
141 }
142 set_reference_map(om);
143 }
144
145 // Create Java array for holding resolved strings, methodHandles,
146 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
147 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
148 Handle refs_handle (THREAD, (oop)stom); // must handleize.
149 set_resolved_references(loader_data->add_handle(refs_handle));
150 }
151 }
152
153 // CDS support. Create a new resolved_references array.
154 void ConstantPool::restore_unshareable_info(TRAPS) {
155 assert(is_constantPool(), "ensure C++ vtable is restored");
156
157 // Only create the new resolved references array if it hasn't been attempted before
158 if (resolved_references() != NULL) return;
159
160 // restore the C++ vtable from the shared archive
161 restore_vtable();
162
163 if (SystemDictionary::Object_klass_loaded()) {
164 // Recreate the object array and add to ClassLoaderData.
165 int map_length = resolved_reference_length();
166 if (map_length > 0) {
167 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
168 Handle refs_handle (THREAD, (oop)stom); // must handleize.
169
170 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
171 set_resolved_references(loader_data->add_handle(refs_handle));
172 }
173 }
174 }
175
176 void ConstantPool::remove_unshareable_info() {
177 // Resolved references are not in the shared archive.
178 // Save the length for restoration. It is not necessarily the same length
179 // as reference_map.length() if invokedynamic is saved.
180 set_resolved_reference_length(
181 resolved_references() != NULL ? resolved_references()->length() : 0);
182 set_resolved_references(NULL);
183 }
184
185 int ConstantPool::cp_to_object_index(int cp_index) {
186 // this is harder don't do this so much.
187 int i = reference_map()->find(cp_index);
188 // We might not find the index for jsr292 call.
189 return (i < 0) ? _no_index_sentinel : i;
190 }
191
192 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
193 resolved_references()->obj_at_put(obj_index, str);
194 }
195
196 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
197 ResourceMark rm;
198 int line_number = -1;
199 const char * source_file = NULL;
200 if (JavaThread::current()->has_last_Java_frame()) {
201 // try to identify the method which called this function.
202 vframeStream vfst(JavaThread::current());
203 if (!vfst.at_end()) {
204 line_number = vfst.method()->line_number_from_bci(vfst.bci());
205 Symbol* s = vfst.method()->method_holder()->source_file_name();
206 if (s != NULL) {
207 source_file = s->as_C_string();
208 }
209 }
210 }
211 if (k != this_cp->pool_holder()) {
212 // only print something if the classes are different
213 if (source_file != NULL) {
214 log_debug(class, resolve)("%s %s %s:%d",
215 this_cp->pool_holder()->external_name(),
216 k->external_name(), source_file, line_number);
217 } else {
218 log_debug(class, resolve)("%s %s",
219 this_cp->pool_holder()->external_name(),
220 k->external_name());
221 }
222 }
223 }
224
225 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
226 bool save_resolution_error, TRAPS) {
227 assert(THREAD->is_Java_thread(), "must be a Java thread");
228
229 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
230 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
231 // the entry and tag is not updated atomicly.
232 CPSlot entry = this_cp->slot_at(which);
233 if (entry.is_resolved()) {
234 assert(entry.get_klass()->is_klass(), "must be");
235 // Already resolved - return entry.
236 return entry.get_klass();
237 }
238
239 // This tag doesn't change back to unresolved class unless at a safepoint.
240 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
241 // The original attempt to resolve this constant pool entry failed so find the
242 // class of the original error and throw another error of the same class
243 // (JVMS 5.4.3).
244 // If there is a detail message, pass that detail message to the error.
245 // The JVMS does not strictly require us to duplicate the same detail message,
246 // or any internal exception fields such as cause or stacktrace. But since the
247 // detail message is often a class name or other literal string, we will repeat it
248 // if we can find it in the symbol table.
249 throw_resolution_error(this_cp, which, CHECK_0);
250 ShouldNotReachHere();
251 }
252
253 Handle mirror_handle;
254 Symbol* name = entry.get_symbol();
255 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
256 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
257 Klass* k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
258 if (!HAS_PENDING_EXCEPTION) {
259 // preserve the resolved klass from unloading
260 mirror_handle = Handle(THREAD, k->java_mirror());
261 // Do access check for klasses
262 verify_constant_pool_resolve(this_cp, k, THREAD);
263 }
264
265 // Failed to resolve class. We must record the errors so that subsequent attempts
266 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
267 if (HAS_PENDING_EXCEPTION) {
268 if (save_resolution_error) {
269 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
270 // If CHECK_NULL above doesn't return the exception, that means that
271 // some other thread has beaten us and has resolved the class.
272 // To preserve old behavior, we return the resolved class.
273 entry = this_cp->resolved_klass_at(which);
274 assert(entry.is_resolved(), "must be resolved if exception was cleared");
275 assert(entry.get_klass()->is_klass(), "must be resolved to a klass");
276 return entry.get_klass();
277 } else {
278 return NULL; // return the pending exception
279 }
280 }
281
282 // Make this class loader depend upon the class loader owning the class reference
283 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
284 this_key->record_dependency(k, CHECK_NULL); // Can throw OOM
285
286 // logging for class+resolve.
287 if (log_is_enabled(Debug, class, resolve)){
288 trace_class_resolution(this_cp, k);
289 }
290 this_cp->klass_at_put(which, k);
291 entry = this_cp->resolved_klass_at(which);
292 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
293 return entry.get_klass();
294 }
295
296
297 // Does not update ConstantPool* - to avoid any exception throwing. Used
298 // by compiler and exception handling. Also used to avoid classloads for
299 // instanceof operations. Returns NULL if the class has not been loaded or
300 // if the verification of constant pool failed
301 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
302 CPSlot entry = this_cp->slot_at(which);
303 if (entry.is_resolved()) {
304 assert(entry.get_klass()->is_klass(), "must be");
305 return entry.get_klass();
306 } else {
307 assert(entry.is_unresolved(), "must be either symbol or klass");
308 Thread *thread = Thread::current();
309 Symbol* name = entry.get_symbol();
310 oop loader = this_cp->pool_holder()->class_loader();
311 oop protection_domain = this_cp->pool_holder()->protection_domain();
312 Handle h_prot (thread, protection_domain);
313 Handle h_loader (thread, loader);
314 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
315
316 if (k != NULL) {
317 // Make sure that resolving is legal
318 EXCEPTION_MARK;
319 // return NULL if verification fails
320 verify_constant_pool_resolve(this_cp, k, THREAD);
321 if (HAS_PENDING_EXCEPTION) {
322 CLEAR_PENDING_EXCEPTION;
323 return NULL;
324 }
325 return k;
326 } else {
327 return k;
328 }
329 }
330 }
331
332
333 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) {
334 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which));
335 }
336
337
338 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
339 int which) {
340 if (cpool->cache() == NULL) return NULL; // nothing to load yet
341 int cache_index = decode_cpcache_index(which, true);
342 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
343 // FIXME: should be an assert
344 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
345 return NULL;
346 }
347 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
348 return e->method_if_resolved(cpool);
349 }
350
351
352 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
353 if (cpool->cache() == NULL) return false; // nothing to load yet
354 int cache_index = decode_cpcache_index(which, true);
355 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
356 return e->has_appendix();
357 }
358
359 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
360 if (cpool->cache() == NULL) return NULL; // nothing to load yet
361 int cache_index = decode_cpcache_index(which, true);
362 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
363 return e->appendix_if_resolved(cpool);
364 }
365
366
367 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
368 if (cpool->cache() == NULL) return false; // nothing to load yet
369 int cache_index = decode_cpcache_index(which, true);
370 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
371 return e->has_method_type();
372 }
373
374 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
375 if (cpool->cache() == NULL) return NULL; // nothing to load yet
376 int cache_index = decode_cpcache_index(which, true);
377 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
378 return e->method_type_if_resolved(cpool);
379 }
380
381
382 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
383 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
384 return symbol_at(name_index);
385 }
386
387
388 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
389 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
390 return symbol_at(signature_index);
391 }
392
393
394 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
395 int i = which;
396 if (!uncached && cache() != NULL) {
397 if (ConstantPool::is_invokedynamic_index(which)) {
398 // Invokedynamic index is index into the constant pool cache
399 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
400 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
401 assert(tag_at(pool_index).is_name_and_type(), "");
402 return pool_index;
403 }
404 // change byte-ordering and go via cache
405 i = remap_instruction_operand_from_cache(which);
406 } else {
407 if (tag_at(which).is_invoke_dynamic()) {
408 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
409 assert(tag_at(pool_index).is_name_and_type(), "");
410 return pool_index;
411 }
412 }
413 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
414 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
415 jint ref_index = *int_at_addr(i);
416 return extract_high_short_from_int(ref_index);
417 }
418
419 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
420 int pool_index = which;
421 if (!uncached && cache() != NULL) {
422 if (ConstantPool::is_invokedynamic_index(which)) {
423 // Invokedynamic index is index into resolved_references
424 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
425 } else {
426 // change byte-ordering and go via cache
427 pool_index = remap_instruction_operand_from_cache(which);
428 }
429 }
430 return tag_at(pool_index);
431 }
432
433 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
434 guarantee(!ConstantPool::is_invokedynamic_index(which),
435 "an invokedynamic instruction does not have a klass");
436 int i = which;
437 if (!uncached && cache() != NULL) {
438 // change byte-ordering and go via cache
439 i = remap_instruction_operand_from_cache(which);
440 }
441 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
442 jint ref_index = *int_at_addr(i);
443 return extract_low_short_from_int(ref_index);
444 }
445
446
447
448 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
449 int cpc_index = operand;
450 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
451 assert((int)(u2)cpc_index == cpc_index, "clean u2");
452 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
453 return member_index;
454 }
455
456
457 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
458 if (k->is_instance_klass() || k->is_objArray_klass()) {
459 InstanceKlass* holder = this_cp->pool_holder();
460 Klass* elem = k->is_instance_klass() ? k : ObjArrayKlass::cast(k)->bottom_klass();
461
462 // The element type could be a typeArray - we only need the access check if it is
463 // an reference to another class
464 if (elem->is_instance_klass()) {
465 LinkResolver::check_klass_accessability(holder, elem, CHECK);
466 }
467 }
468 }
469
470
471 int ConstantPool::name_ref_index_at(int which_nt) {
472 jint ref_index = name_and_type_at(which_nt);
473 return extract_low_short_from_int(ref_index);
474 }
475
476
477 int ConstantPool::signature_ref_index_at(int which_nt) {
478 jint ref_index = name_and_type_at(which_nt);
479 return extract_high_short_from_int(ref_index);
480 }
481
482
483 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
484 return klass_at(klass_ref_index_at(which), THREAD);
485 }
486
487
488 Symbol* ConstantPool::klass_name_at(int which) const {
489 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
490 "Corrupted constant pool");
491 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
492 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
493 // tag is not updated atomicly.
494 CPSlot entry = slot_at(which);
495 if (entry.is_resolved()) {
496 // Already resolved - return entry's name.
497 assert(entry.get_klass()->is_klass(), "must be");
498 return entry.get_klass()->name();
499 } else {
500 assert(entry.is_unresolved(), "must be either symbol or klass");
501 return entry.get_symbol();
502 }
503 }
504
505 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
506 jint ref_index = klass_ref_index_at(which);
507 return klass_at_noresolve(ref_index);
508 }
509
510 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
511 jint ref_index = uncached_klass_ref_index_at(which);
512 return klass_at_noresolve(ref_index);
513 }
514
515 char* ConstantPool::string_at_noresolve(int which) {
516 return unresolved_string_at(which)->as_C_string();
517 }
518
519 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
520 return FieldType::basic_type(symbol_at(which));
521 }
522
523
524 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
525 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
526 if (this_cp->tag_at(index).is_string()) {
527 this_cp->string_at(index, CHECK);
528 }
529 }
530 }
531
532 // Resolve all the classes in the constant pool. If they are all resolved,
533 // the constant pool is read-only. Enhancement: allocate cp entries to
534 // another metaspace, and copy to read-only or read-write space if this
535 // bit is set.
536 bool ConstantPool::resolve_class_constants(TRAPS) {
537 constantPoolHandle cp(THREAD, this);
538 for (int index = 1; index < length(); index++) { // Index 0 is unused
539 if (tag_at(index).is_unresolved_klass() &&
540 klass_at_if_loaded(cp, index) == NULL) {
541 return false;
542 }
543 }
544 // set_preresolution(); or some bit for future use
545 return true;
546 }
547
548 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
549 // Dig out the detailed message to reuse if possible
550 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
551 if (message != NULL) {
552 return message;
553 }
554
555 // Return specific message for the tag
556 switch (tag.value()) {
557 case JVM_CONSTANT_UnresolvedClass:
558 // return the class name in the error message
559 message = this_cp->klass_name_at(which);
560 break;
561 case JVM_CONSTANT_MethodHandle:
562 // return the method handle name in the error message
563 message = this_cp->method_handle_name_ref_at(which);
564 break;
565 case JVM_CONSTANT_MethodType:
566 // return the method type signature in the error message
567 message = this_cp->method_type_signature_at(which);
568 break;
569 default:
570 ShouldNotReachHere();
571 }
572
573 return message;
574 }
575
576 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
577 Symbol* message = NULL;
578 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
579 assert(error != NULL && message != NULL, "checking");
580 CLEAR_PENDING_EXCEPTION;
581 ResourceMark rm;
582 THROW_MSG(error, message->as_C_string());
583 }
584
585 // If resolution for Class, MethodHandle or MethodType fails, save the exception
586 // in the resolution error table, so that the same exception is thrown again.
587 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
588 constantTag tag, TRAPS) {
589 Symbol* error = PENDING_EXCEPTION->klass()->name();
590
591 int error_tag = tag.error_value();
592
593 if (!PENDING_EXCEPTION->
594 is_a(SystemDictionary::LinkageError_klass())) {
595 // Just throw the exception and don't prevent these classes from
596 // being loaded due to virtual machine errors like StackOverflow
597 // and OutOfMemoryError, etc, or if the thread was hit by stop()
598 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
599 } else if (this_cp->tag_at(which).value() != error_tag) {
600 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
601 SystemDictionary::add_resolution_error(this_cp, which, error, message);
602 // CAS in the tag. If a thread beat us to registering this error that's fine.
603 // If another thread resolved the reference, this is a race condition. This
604 // thread may have had a security manager or something temporary.
605 // This doesn't deterministically get an error. So why do we save this?
606 // We save this because jvmti can add classes to the bootclass path after
607 // this error, so it needs to get the same error if the error is first.
608 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
609 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
610 if (old_tag != error_tag && old_tag != tag.value()) {
611 // MethodHandles and MethodType doesn't change to resolved version.
612 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
613 // Forget the exception and use the resolved class.
614 CLEAR_PENDING_EXCEPTION;
615 }
616 } else {
617 // some other thread put this in error state
618 throw_resolution_error(this_cp, which, CHECK);
619 }
620 }
621
622 // Called to resolve constants in the constant pool and return an oop.
623 // Some constant pool entries cache their resolved oop. This is also
624 // called to create oops from constants to use in arguments for invokedynamic
625 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) {
626 oop result_oop = NULL;
627 Handle throw_exception;
628
629 if (cache_index == _possible_index_sentinel) {
630 // It is possible that this constant is one which is cached in the objects.
631 // We'll do a linear search. This should be OK because this usage is rare.
632 assert(index > 0, "valid index");
633 cache_index = this_cp->cp_to_object_index(index);
634 }
635 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
636 assert(index == _no_index_sentinel || index >= 0, "");
637
638 if (cache_index >= 0) {
639 result_oop = this_cp->resolved_references()->obj_at(cache_index);
640 if (result_oop != NULL) {
641 return result_oop;
642 // That was easy...
643 }
644 index = this_cp->object_to_cp_index(cache_index);
645 }
646
647 jvalue prim_value; // temp used only in a few cases below
648
649 constantTag tag = this_cp->tag_at(index);
650
651 switch (tag.value()) {
652
653 case JVM_CONSTANT_UnresolvedClass:
654 case JVM_CONSTANT_UnresolvedClassInError:
655 case JVM_CONSTANT_Class:
656 {
657 assert(cache_index == _no_index_sentinel, "should not have been set");
658 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
659 // ldc wants the java mirror.
660 result_oop = resolved->java_mirror();
661 break;
662 }
663
664 case JVM_CONSTANT_String:
665 assert(cache_index != _no_index_sentinel, "should have been set");
666 if (this_cp->is_pseudo_string_at(index)) {
667 result_oop = this_cp->pseudo_string_at(index, cache_index);
668 break;
669 }
670 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
671 break;
672
673 case JVM_CONSTANT_MethodHandleInError:
674 case JVM_CONSTANT_MethodTypeInError:
675 {
676 throw_resolution_error(this_cp, index, CHECK_NULL);
677 break;
678 }
679
680 case JVM_CONSTANT_MethodHandle:
681 {
682 int ref_kind = this_cp->method_handle_ref_kind_at(index);
683 int callee_index = this_cp->method_handle_klass_index_at(index);
684 Symbol* name = this_cp->method_handle_name_ref_at(index);
685 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
686 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
687 { ResourceMark rm(THREAD);
688 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
689 ref_kind, index, this_cp->method_handle_index_at(index),
690 callee_index, name->as_C_string(), signature->as_C_string());
691 }
692
693 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
694
695 // Check constant pool method consistency
696 if ((callee->is_interface() && m_tag.is_method()) ||
697 ((!callee->is_interface() && m_tag.is_interface_method()))) {
698 ResourceMark rm(THREAD);
699 char buf[400];
700 jio_snprintf(buf, sizeof(buf),
701 "Inconsistent constant pool data in classfile for class %s. "
702 "Method %s%s at index %d is %s and should be %s",
703 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index,
704 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
705 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
706 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
707 }
708
709 Klass* klass = this_cp->pool_holder();
710 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
711 callee, name, signature,
712 THREAD);
713 result_oop = value();
714 if (HAS_PENDING_EXCEPTION) {
715 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
716 }
717 break;
718 }
719
720 case JVM_CONSTANT_MethodType:
721 {
722 Symbol* signature = this_cp->method_type_signature_at(index);
723 { ResourceMark rm(THREAD);
724 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
725 index, this_cp->method_type_index_at(index),
726 signature->as_C_string());
727 }
728 Klass* klass = this_cp->pool_holder();
729 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
730 result_oop = value();
731 if (HAS_PENDING_EXCEPTION) {
732 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
733 }
734 break;
735 }
736
737 case JVM_CONSTANT_Integer:
738 assert(cache_index == _no_index_sentinel, "should not have been set");
739 prim_value.i = this_cp->int_at(index);
740 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
741 break;
742
743 case JVM_CONSTANT_Float:
744 assert(cache_index == _no_index_sentinel, "should not have been set");
745 prim_value.f = this_cp->float_at(index);
746 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
747 break;
748
749 case JVM_CONSTANT_Long:
750 assert(cache_index == _no_index_sentinel, "should not have been set");
751 prim_value.j = this_cp->long_at(index);
752 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
753 break;
754
755 case JVM_CONSTANT_Double:
756 assert(cache_index == _no_index_sentinel, "should not have been set");
757 prim_value.d = this_cp->double_at(index);
758 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
759 break;
760
761 default:
762 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
763 this_cp(), index, cache_index, tag.value()));
764 assert(false, "unexpected constant tag");
765 break;
766 }
767
768 if (cache_index >= 0) {
769 // Benign race condition: resolved_references may already be filled in.
770 // The important thing here is that all threads pick up the same result.
771 // It doesn't matter which racing thread wins, as long as only one
772 // result is used by all threads, and all future queries.
773 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL);
774 if (old_result == NULL) {
775 return result_oop; // was installed
776 } else {
777 // Return the winning thread's result. This can be different than
778 // the result here for MethodHandles.
779 return old_result;
780 }
781 } else {
782 return result_oop;
783 }
784 }
785
786 oop ConstantPool::uncached_string_at(int which, TRAPS) {
787 Symbol* sym = unresolved_string_at(which);
788 oop str = StringTable::intern(sym, CHECK_(NULL));
789 assert(java_lang_String::is_instance(str), "must be string");
790 return str;
791 }
792
793
794 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) {
795 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
796
797 Handle bsm;
798 int argc;
799 {
800 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
801 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
802 // It is accompanied by the optional arguments.
803 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
804 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
805 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
806 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
807 }
808
809 // Extract the optional static arguments.
810 argc = this_cp->invoke_dynamic_argument_count_at(index);
811 if (argc == 0) return bsm_oop;
812
813 bsm = Handle(THREAD, bsm_oop);
814 }
815
816 objArrayHandle info;
817 {
818 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
819 info = objArrayHandle(THREAD, info_oop);
820 }
821
822 info->obj_at_put(0, bsm());
823 for (int i = 0; i < argc; i++) {
824 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
825 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
826 info->obj_at_put(1+i, arg_oop);
827 }
828
829 return info();
830 }
831
832 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
833 // If the string has already been interned, this entry will be non-null
834 oop str = this_cp->resolved_references()->obj_at(obj_index);
835 if (str != NULL) return str;
836 Symbol* sym = this_cp->unresolved_string_at(which);
837 str = StringTable::intern(sym, CHECK_(NULL));
838 this_cp->string_at_put(which, obj_index, str);
839 assert(java_lang_String::is_instance(str), "must be string");
840 return str;
841 }
842
843
844 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
845 // Names are interned, so we can compare Symbol*s directly
846 Symbol* cp_name = klass_name_at(which);
847 return (cp_name == k->name());
848 }
849
850
851 // Iterate over symbols and decrement ones which are Symbol*s
852 // This is done during GC.
853 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
854 // these symbols but didn't increment the reference count.
855 void ConstantPool::unreference_symbols() {
856 for (int index = 1; index < length(); index++) { // Index 0 is unused
857 constantTag tag = tag_at(index);
858 if (tag.is_symbol()) {
859 symbol_at(index)->decrement_refcount();
860 }
861 }
862 }
863
864
865 // Compare this constant pool's entry at index1 to the constant pool
866 // cp2's entry at index2.
867 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
868 int index2, TRAPS) {
869
870 // The error tags are equivalent to non-error tags when comparing
871 jbyte t1 = tag_at(index1).non_error_value();
872 jbyte t2 = cp2->tag_at(index2).non_error_value();
873
874 if (t1 != t2) {
875 // Not the same entry type so there is nothing else to check. Note
876 // that this style of checking will consider resolved/unresolved
877 // class pairs as different.
878 // From the ConstantPool* API point of view, this is correct
879 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
880 // plays out in the context of ConstantPool* merging.
881 return false;
882 }
883
884 switch (t1) {
885 case JVM_CONSTANT_Class:
886 {
887 Klass* k1 = klass_at(index1, CHECK_false);
888 Klass* k2 = cp2->klass_at(index2, CHECK_false);
889 if (k1 == k2) {
890 return true;
891 }
892 } break;
893
894 case JVM_CONSTANT_ClassIndex:
895 {
896 int recur1 = klass_index_at(index1);
897 int recur2 = cp2->klass_index_at(index2);
898 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
899 if (match) {
900 return true;
901 }
902 } break;
903
904 case JVM_CONSTANT_Double:
905 {
906 jdouble d1 = double_at(index1);
907 jdouble d2 = cp2->double_at(index2);
908 if (d1 == d2) {
909 return true;
910 }
911 } break;
912
913 case JVM_CONSTANT_Fieldref:
914 case JVM_CONSTANT_InterfaceMethodref:
915 case JVM_CONSTANT_Methodref:
916 {
917 int recur1 = uncached_klass_ref_index_at(index1);
918 int recur2 = cp2->uncached_klass_ref_index_at(index2);
919 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
920 if (match) {
921 recur1 = uncached_name_and_type_ref_index_at(index1);
922 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
923 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
924 if (match) {
925 return true;
926 }
927 }
928 } break;
929
930 case JVM_CONSTANT_Float:
931 {
932 jfloat f1 = float_at(index1);
933 jfloat f2 = cp2->float_at(index2);
934 if (f1 == f2) {
935 return true;
936 }
937 } break;
938
939 case JVM_CONSTANT_Integer:
940 {
941 jint i1 = int_at(index1);
942 jint i2 = cp2->int_at(index2);
943 if (i1 == i2) {
944 return true;
945 }
946 } break;
947
948 case JVM_CONSTANT_Long:
949 {
950 jlong l1 = long_at(index1);
951 jlong l2 = cp2->long_at(index2);
952 if (l1 == l2) {
953 return true;
954 }
955 } break;
956
957 case JVM_CONSTANT_NameAndType:
958 {
959 int recur1 = name_ref_index_at(index1);
960 int recur2 = cp2->name_ref_index_at(index2);
961 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
962 if (match) {
963 recur1 = signature_ref_index_at(index1);
964 recur2 = cp2->signature_ref_index_at(index2);
965 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
966 if (match) {
967 return true;
968 }
969 }
970 } break;
971
972 case JVM_CONSTANT_StringIndex:
973 {
974 int recur1 = string_index_at(index1);
975 int recur2 = cp2->string_index_at(index2);
976 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
977 if (match) {
978 return true;
979 }
980 } break;
981
982 case JVM_CONSTANT_UnresolvedClass:
983 {
984 Symbol* k1 = klass_name_at(index1);
985 Symbol* k2 = cp2->klass_name_at(index2);
986 if (k1 == k2) {
987 return true;
988 }
989 } break;
990
991 case JVM_CONSTANT_MethodType:
992 {
993 int k1 = method_type_index_at(index1);
994 int k2 = cp2->method_type_index_at(index2);
995 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
996 if (match) {
997 return true;
998 }
999 } break;
1000
1001 case JVM_CONSTANT_MethodHandle:
1002 {
1003 int k1 = method_handle_ref_kind_at(index1);
1004 int k2 = cp2->method_handle_ref_kind_at(index2);
1005 if (k1 == k2) {
1006 int i1 = method_handle_index_at(index1);
1007 int i2 = cp2->method_handle_index_at(index2);
1008 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1009 if (match) {
1010 return true;
1011 }
1012 }
1013 } break;
1014
1015 case JVM_CONSTANT_InvokeDynamic:
1016 {
1017 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1018 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1019 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1020 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1021 // separate statements and variables because CHECK_false is used
1022 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1023 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1024 return (match_entry && match_operand);
1025 } break;
1026
1027 case JVM_CONSTANT_String:
1028 {
1029 Symbol* s1 = unresolved_string_at(index1);
1030 Symbol* s2 = cp2->unresolved_string_at(index2);
1031 if (s1 == s2) {
1032 return true;
1033 }
1034 } break;
1035
1036 case JVM_CONSTANT_Utf8:
1037 {
1038 Symbol* s1 = symbol_at(index1);
1039 Symbol* s2 = cp2->symbol_at(index2);
1040 if (s1 == s2) {
1041 return true;
1042 }
1043 } break;
1044
1045 // Invalid is used as the tag for the second constant pool entry
1046 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1047 // not be seen by itself.
1048 case JVM_CONSTANT_Invalid: // fall through
1049
1050 default:
1051 ShouldNotReachHere();
1052 break;
1053 }
1054
1055 return false;
1056 } // end compare_entry_to()
1057
1058
1059 // Resize the operands array with delta_len and delta_size.
1060 // Used in RedefineClasses for CP merge.
1061 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1062 int old_len = operand_array_length(operands());
1063 int new_len = old_len + delta_len;
1064 int min_len = (delta_len > 0) ? old_len : new_len;
1065
1066 int old_size = operands()->length();
1067 int new_size = old_size + delta_size;
1068 int min_size = (delta_size > 0) ? old_size : new_size;
1069
1070 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1071 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1072
1073 // Set index in the resized array for existing elements only
1074 for (int idx = 0; idx < min_len; idx++) {
1075 int offset = operand_offset_at(idx); // offset in original array
1076 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1077 }
1078 // Copy the bootstrap specifiers only
1079 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1080 new_ops->adr_at(2*new_len),
1081 (min_size - 2*min_len) * sizeof(u2));
1082 // Explicitly deallocate old operands array.
1083 // Note, it is not needed for 7u backport.
1084 if ( operands() != NULL) { // the safety check
1085 MetadataFactory::free_array<u2>(loader_data, operands());
1086 }
1087 set_operands(new_ops);
1088 } // end resize_operands()
1089
1090
1091 // Extend the operands array with the length and size of the ext_cp operands.
1092 // Used in RedefineClasses for CP merge.
1093 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1094 int delta_len = operand_array_length(ext_cp->operands());
1095 if (delta_len == 0) {
1096 return; // nothing to do
1097 }
1098 int delta_size = ext_cp->operands()->length();
1099
1100 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1101
1102 if (operand_array_length(operands()) == 0) {
1103 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1104 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1105 // The first element index defines the offset of second part
1106 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1107 set_operands(new_ops);
1108 } else {
1109 resize_operands(delta_len, delta_size, CHECK);
1110 }
1111
1112 } // end extend_operands()
1113
1114
1115 // Shrink the operands array to a smaller array with new_len length.
1116 // Used in RedefineClasses for CP merge.
1117 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1118 int old_len = operand_array_length(operands());
1119 if (new_len == old_len) {
1120 return; // nothing to do
1121 }
1122 assert(new_len < old_len, "shrunken operands array must be smaller");
1123
1124 int free_base = operand_next_offset_at(new_len - 1);
1125 int delta_len = new_len - old_len;
1126 int delta_size = 2*delta_len + free_base - operands()->length();
1127
1128 resize_operands(delta_len, delta_size, CHECK);
1129
1130 } // end shrink_operands()
1131
1132
1133 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1134 const constantPoolHandle& to_cp,
1135 TRAPS) {
1136
1137 int from_oplen = operand_array_length(from_cp->operands());
1138 int old_oplen = operand_array_length(to_cp->operands());
1139 if (from_oplen != 0) {
1140 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1141 // append my operands to the target's operands array
1142 if (old_oplen == 0) {
1143 // Can't just reuse from_cp's operand list because of deallocation issues
1144 int len = from_cp->operands()->length();
1145 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1146 Copy::conjoint_memory_atomic(
1147 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1148 to_cp->set_operands(new_ops);
1149 } else {
1150 int old_len = to_cp->operands()->length();
1151 int from_len = from_cp->operands()->length();
1152 int old_off = old_oplen * sizeof(u2);
1153 int from_off = from_oplen * sizeof(u2);
1154 // Use the metaspace for the destination constant pool
1155 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1156 int fillp = 0, len = 0;
1157 // first part of dest
1158 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1159 new_operands->adr_at(fillp),
1160 (len = old_off) * sizeof(u2));
1161 fillp += len;
1162 // first part of src
1163 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1164 new_operands->adr_at(fillp),
1165 (len = from_off) * sizeof(u2));
1166 fillp += len;
1167 // second part of dest
1168 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1169 new_operands->adr_at(fillp),
1170 (len = old_len - old_off) * sizeof(u2));
1171 fillp += len;
1172 // second part of src
1173 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1174 new_operands->adr_at(fillp),
1175 (len = from_len - from_off) * sizeof(u2));
1176 fillp += len;
1177 assert(fillp == new_operands->length(), "");
1178
1179 // Adjust indexes in the first part of the copied operands array.
1180 for (int j = 0; j < from_oplen; j++) {
1181 int offset = operand_offset_at(new_operands, old_oplen + j);
1182 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1183 offset += old_len; // every new tuple is preceded by old_len extra u2's
1184 operand_offset_at_put(new_operands, old_oplen + j, offset);
1185 }
1186
1187 // replace target operands array with combined array
1188 to_cp->set_operands(new_operands);
1189 }
1190 }
1191 } // end copy_operands()
1192
1193
1194 // Copy this constant pool's entries at start_i to end_i (inclusive)
1195 // to the constant pool to_cp's entries starting at to_i. A total of
1196 // (end_i - start_i) + 1 entries are copied.
1197 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1198 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1199
1200
1201 int dest_i = to_i; // leave original alone for debug purposes
1202
1203 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1204 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1205
1206 switch (from_cp->tag_at(src_i).value()) {
1207 case JVM_CONSTANT_Double:
1208 case JVM_CONSTANT_Long:
1209 // double and long take two constant pool entries
1210 src_i += 2;
1211 dest_i += 2;
1212 break;
1213
1214 default:
1215 // all others take one constant pool entry
1216 src_i++;
1217 dest_i++;
1218 break;
1219 }
1220 }
1221 copy_operands(from_cp, to_cp, CHECK);
1222
1223 } // end copy_cp_to_impl()
1224
1225
1226 // Copy this constant pool's entry at from_i to the constant pool
1227 // to_cp's entry at to_i.
1228 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1229 const constantPoolHandle& to_cp, int to_i,
1230 TRAPS) {
1231
1232 int tag = from_cp->tag_at(from_i).value();
1233 switch (tag) {
1234 case JVM_CONSTANT_Class:
1235 {
1236 Klass* k = from_cp->klass_at(from_i, CHECK);
1237 to_cp->klass_at_put(to_i, k);
1238 } break;
1239
1240 case JVM_CONSTANT_ClassIndex:
1241 {
1242 jint ki = from_cp->klass_index_at(from_i);
1243 to_cp->klass_index_at_put(to_i, ki);
1244 } break;
1245
1246 case JVM_CONSTANT_Double:
1247 {
1248 jdouble d = from_cp->double_at(from_i);
1249 to_cp->double_at_put(to_i, d);
1250 // double takes two constant pool entries so init second entry's tag
1251 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1252 } break;
1253
1254 case JVM_CONSTANT_Fieldref:
1255 {
1256 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1257 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1258 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1259 } break;
1260
1261 case JVM_CONSTANT_Float:
1262 {
1263 jfloat f = from_cp->float_at(from_i);
1264 to_cp->float_at_put(to_i, f);
1265 } break;
1266
1267 case JVM_CONSTANT_Integer:
1268 {
1269 jint i = from_cp->int_at(from_i);
1270 to_cp->int_at_put(to_i, i);
1271 } break;
1272
1273 case JVM_CONSTANT_InterfaceMethodref:
1274 {
1275 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1276 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1277 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1278 } break;
1279
1280 case JVM_CONSTANT_Long:
1281 {
1282 jlong l = from_cp->long_at(from_i);
1283 to_cp->long_at_put(to_i, l);
1284 // long takes two constant pool entries so init second entry's tag
1285 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1286 } break;
1287
1288 case JVM_CONSTANT_Methodref:
1289 {
1290 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1291 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1292 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1293 } break;
1294
1295 case JVM_CONSTANT_NameAndType:
1296 {
1297 int name_ref_index = from_cp->name_ref_index_at(from_i);
1298 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1299 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1300 } break;
1301
1302 case JVM_CONSTANT_StringIndex:
1303 {
1304 jint si = from_cp->string_index_at(from_i);
1305 to_cp->string_index_at_put(to_i, si);
1306 } break;
1307
1308 case JVM_CONSTANT_UnresolvedClass:
1309 case JVM_CONSTANT_UnresolvedClassInError:
1310 {
1311 // Can be resolved after checking tag, so check the slot first.
1312 CPSlot entry = from_cp->slot_at(from_i);
1313 if (entry.is_resolved()) {
1314 assert(entry.get_klass()->is_klass(), "must be");
1315 // Already resolved
1316 to_cp->klass_at_put(to_i, entry.get_klass());
1317 } else {
1318 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1319 }
1320 } break;
1321
1322 case JVM_CONSTANT_String:
1323 {
1324 Symbol* s = from_cp->unresolved_string_at(from_i);
1325 to_cp->unresolved_string_at_put(to_i, s);
1326 } break;
1327
1328 case JVM_CONSTANT_Utf8:
1329 {
1330 Symbol* s = from_cp->symbol_at(from_i);
1331 // Need to increase refcount, the old one will be thrown away and deferenced
1332 s->increment_refcount();
1333 to_cp->symbol_at_put(to_i, s);
1334 } break;
1335
1336 case JVM_CONSTANT_MethodType:
1337 case JVM_CONSTANT_MethodTypeInError:
1338 {
1339 jint k = from_cp->method_type_index_at(from_i);
1340 to_cp->method_type_index_at_put(to_i, k);
1341 } break;
1342
1343 case JVM_CONSTANT_MethodHandle:
1344 case JVM_CONSTANT_MethodHandleInError:
1345 {
1346 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1347 int k2 = from_cp->method_handle_index_at(from_i);
1348 to_cp->method_handle_index_at_put(to_i, k1, k2);
1349 } break;
1350
1351 case JVM_CONSTANT_InvokeDynamic:
1352 {
1353 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1354 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1355 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1356 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1357 } break;
1358
1359 // Invalid is used as the tag for the second constant pool entry
1360 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1361 // not be seen by itself.
1362 case JVM_CONSTANT_Invalid: // fall through
1363
1364 default:
1365 {
1366 ShouldNotReachHere();
1367 } break;
1368 }
1369 } // end copy_entry_to()
1370
1371
1372 // Search constant pool search_cp for an entry that matches this
1373 // constant pool's entry at pattern_i. Returns the index of a
1374 // matching entry or zero (0) if there is no matching entry.
1375 int ConstantPool::find_matching_entry(int pattern_i,
1376 const constantPoolHandle& search_cp, TRAPS) {
1377
1378 // index zero (0) is not used
1379 for (int i = 1; i < search_cp->length(); i++) {
1380 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1381 if (found) {
1382 return i;
1383 }
1384 }
1385
1386 return 0; // entry not found; return unused index zero (0)
1387 } // end find_matching_entry()
1388
1389
1390 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1391 // cp2's bootstrap specifier at idx2.
1392 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1393 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1394 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1395 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1396
1397 if (!match) {
1398 return false;
1399 }
1400 int argc = operand_argument_count_at(idx1);
1401 if (argc == cp2->operand_argument_count_at(idx2)) {
1402 for (int j = 0; j < argc; j++) {
1403 k1 = operand_argument_index_at(idx1, j);
1404 k2 = cp2->operand_argument_index_at(idx2, j);
1405 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1406 if (!match) {
1407 return false;
1408 }
1409 }
1410 return true; // got through loop; all elements equal
1411 }
1412 return false;
1413 } // end compare_operand_to()
1414
1415 // Search constant pool search_cp for a bootstrap specifier that matches
1416 // this constant pool's bootstrap specifier at pattern_i index.
1417 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1418 int ConstantPool::find_matching_operand(int pattern_i,
1419 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1420 for (int i = 0; i < search_len; i++) {
1421 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1422 if (found) {
1423 return i;
1424 }
1425 }
1426 return -1; // bootstrap specifier not found; return unused index (-1)
1427 } // end find_matching_operand()
1428
1429
1430 #ifndef PRODUCT
1431
1432 const char* ConstantPool::printable_name_at(int which) {
1433
1434 constantTag tag = tag_at(which);
1435
1436 if (tag.is_string()) {
1437 return string_at_noresolve(which);
1438 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1439 return klass_name_at(which)->as_C_string();
1440 } else if (tag.is_symbol()) {
1441 return symbol_at(which)->as_C_string();
1442 }
1443 return "";
1444 }
1445
1446 #endif // PRODUCT
1447
1448
1449 // JVMTI GetConstantPool support
1450
1451 // For debugging of constant pool
1452 const bool debug_cpool = false;
1453
1454 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1455
1456 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1457 const char* WARN_MSG = "Must not be such entry!";
1458 jint size = 0;
1459 u2 idx1, idx2;
1460
1461 for (jint idx = 1; idx < cnt; idx++) {
1462 jint ent_size = 0;
1463 u1 tag = *bytes++;
1464 size++; // count tag
1465
1466 printf("const #%03d, tag: %02d ", idx, tag);
1467 switch(tag) {
1468 case JVM_CONSTANT_Invalid: {
1469 printf("Invalid");
1470 break;
1471 }
1472 case JVM_CONSTANT_Unicode: {
1473 printf("Unicode %s", WARN_MSG);
1474 break;
1475 }
1476 case JVM_CONSTANT_Utf8: {
1477 u2 len = Bytes::get_Java_u2(bytes);
1478 char str[128];
1479 if (len > 127) {
1480 len = 127;
1481 }
1482 strncpy(str, (char *) (bytes+2), len);
1483 str[len] = '\0';
1484 printf("Utf8 \"%s\"", str);
1485 ent_size = 2 + len;
1486 break;
1487 }
1488 case JVM_CONSTANT_Integer: {
1489 u4 val = Bytes::get_Java_u4(bytes);
1490 printf("int %d", *(int *) &val);
1491 ent_size = 4;
1492 break;
1493 }
1494 case JVM_CONSTANT_Float: {
1495 u4 val = Bytes::get_Java_u4(bytes);
1496 printf("float %5.3ff", *(float *) &val);
1497 ent_size = 4;
1498 break;
1499 }
1500 case JVM_CONSTANT_Long: {
1501 u8 val = Bytes::get_Java_u8(bytes);
1502 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1503 ent_size = 8;
1504 idx++; // Long takes two cpool slots
1505 break;
1506 }
1507 case JVM_CONSTANT_Double: {
1508 u8 val = Bytes::get_Java_u8(bytes);
1509 printf("double %5.3fd", *(jdouble *)&val);
1510 ent_size = 8;
1511 idx++; // Double takes two cpool slots
1512 break;
1513 }
1514 case JVM_CONSTANT_Class: {
1515 idx1 = Bytes::get_Java_u2(bytes);
1516 printf("class #%03d", idx1);
1517 ent_size = 2;
1518 break;
1519 }
1520 case JVM_CONSTANT_String: {
1521 idx1 = Bytes::get_Java_u2(bytes);
1522 printf("String #%03d", idx1);
1523 ent_size = 2;
1524 break;
1525 }
1526 case JVM_CONSTANT_Fieldref: {
1527 idx1 = Bytes::get_Java_u2(bytes);
1528 idx2 = Bytes::get_Java_u2(bytes+2);
1529 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1530 ent_size = 4;
1531 break;
1532 }
1533 case JVM_CONSTANT_Methodref: {
1534 idx1 = Bytes::get_Java_u2(bytes);
1535 idx2 = Bytes::get_Java_u2(bytes+2);
1536 printf("Method #%03d, #%03d", idx1, idx2);
1537 ent_size = 4;
1538 break;
1539 }
1540 case JVM_CONSTANT_InterfaceMethodref: {
1541 idx1 = Bytes::get_Java_u2(bytes);
1542 idx2 = Bytes::get_Java_u2(bytes+2);
1543 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1544 ent_size = 4;
1545 break;
1546 }
1547 case JVM_CONSTANT_NameAndType: {
1548 idx1 = Bytes::get_Java_u2(bytes);
1549 idx2 = Bytes::get_Java_u2(bytes+2);
1550 printf("NameAndType #%03d, #%03d", idx1, idx2);
1551 ent_size = 4;
1552 break;
1553 }
1554 case JVM_CONSTANT_ClassIndex: {
1555 printf("ClassIndex %s", WARN_MSG);
1556 break;
1557 }
1558 case JVM_CONSTANT_UnresolvedClass: {
1559 printf("UnresolvedClass: %s", WARN_MSG);
1560 break;
1561 }
1562 case JVM_CONSTANT_UnresolvedClassInError: {
1563 printf("UnresolvedClassInErr: %s", WARN_MSG);
1564 break;
1565 }
1566 case JVM_CONSTANT_StringIndex: {
1567 printf("StringIndex: %s", WARN_MSG);
1568 break;
1569 }
1570 }
1571 printf(";\n");
1572 bytes += ent_size;
1573 size += ent_size;
1574 }
1575 printf("Cpool size: %d\n", size);
1576 fflush(0);
1577 return;
1578 } /* end print_cpool_bytes */
1579
1580
1581 // Returns size of constant pool entry.
1582 jint ConstantPool::cpool_entry_size(jint idx) {
1583 switch(tag_at(idx).value()) {
1584 case JVM_CONSTANT_Invalid:
1585 case JVM_CONSTANT_Unicode:
1586 return 1;
1587
1588 case JVM_CONSTANT_Utf8:
1589 return 3 + symbol_at(idx)->utf8_length();
1590
1591 case JVM_CONSTANT_Class:
1592 case JVM_CONSTANT_String:
1593 case JVM_CONSTANT_ClassIndex:
1594 case JVM_CONSTANT_UnresolvedClass:
1595 case JVM_CONSTANT_UnresolvedClassInError:
1596 case JVM_CONSTANT_StringIndex:
1597 case JVM_CONSTANT_MethodType:
1598 case JVM_CONSTANT_MethodTypeInError:
1599 return 3;
1600
1601 case JVM_CONSTANT_MethodHandle:
1602 case JVM_CONSTANT_MethodHandleInError:
1603 return 4; //tag, ref_kind, ref_index
1604
1605 case JVM_CONSTANT_Integer:
1606 case JVM_CONSTANT_Float:
1607 case JVM_CONSTANT_Fieldref:
1608 case JVM_CONSTANT_Methodref:
1609 case JVM_CONSTANT_InterfaceMethodref:
1610 case JVM_CONSTANT_NameAndType:
1611 return 5;
1612
1613 case JVM_CONSTANT_InvokeDynamic:
1614 // u1 tag, u2 bsm, u2 nt
1615 return 5;
1616
1617 case JVM_CONSTANT_Long:
1618 case JVM_CONSTANT_Double:
1619 return 9;
1620 }
1621 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1622 return 1;
1623 } /* end cpool_entry_size */
1624
1625
1626 // SymbolHashMap is used to find a constant pool index from a string.
1627 // This function fills in SymbolHashMaps, one for utf8s and one for
1628 // class names, returns size of the cpool raw bytes.
1629 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1630 SymbolHashMap *classmap) {
1631 jint size = 0;
1632
1633 for (u2 idx = 1; idx < length(); idx++) {
1634 u2 tag = tag_at(idx).value();
1635 size += cpool_entry_size(idx);
1636
1637 switch(tag) {
1638 case JVM_CONSTANT_Utf8: {
1639 Symbol* sym = symbol_at(idx);
1640 symmap->add_entry(sym, idx);
1641 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1642 break;
1643 }
1644 case JVM_CONSTANT_Class:
1645 case JVM_CONSTANT_UnresolvedClass:
1646 case JVM_CONSTANT_UnresolvedClassInError: {
1647 Symbol* sym = klass_name_at(idx);
1648 classmap->add_entry(sym, idx);
1649 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1650 break;
1651 }
1652 case JVM_CONSTANT_Long:
1653 case JVM_CONSTANT_Double: {
1654 idx++; // Both Long and Double take two cpool slots
1655 break;
1656 }
1657 }
1658 }
1659 return size;
1660 } /* end hash_utf8_entries_to */
1661
1662
1663 // Copy cpool bytes.
1664 // Returns:
1665 // 0, in case of OutOfMemoryError
1666 // -1, in case of internal error
1667 // > 0, count of the raw cpool bytes that have been copied
1668 int ConstantPool::copy_cpool_bytes(int cpool_size,
1669 SymbolHashMap* tbl,
1670 unsigned char *bytes) {
1671 u2 idx1, idx2;
1672 jint size = 0;
1673 jint cnt = length();
1674 unsigned char *start_bytes = bytes;
1675
1676 for (jint idx = 1; idx < cnt; idx++) {
1677 u1 tag = tag_at(idx).value();
1678 jint ent_size = cpool_entry_size(idx);
1679
1680 assert(size + ent_size <= cpool_size, "Size mismatch");
1681
1682 *bytes = tag;
1683 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1684 switch(tag) {
1685 case JVM_CONSTANT_Invalid: {
1686 DBG(printf("JVM_CONSTANT_Invalid"));
1687 break;
1688 }
1689 case JVM_CONSTANT_Unicode: {
1690 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1691 DBG(printf("JVM_CONSTANT_Unicode"));
1692 break;
1693 }
1694 case JVM_CONSTANT_Utf8: {
1695 Symbol* sym = symbol_at(idx);
1696 char* str = sym->as_utf8();
1697 // Warning! It's crashing on x86 with len = sym->utf8_length()
1698 int len = (int) strlen(str);
1699 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1700 for (int i = 0; i < len; i++) {
1701 bytes[3+i] = (u1) str[i];
1702 }
1703 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1704 break;
1705 }
1706 case JVM_CONSTANT_Integer: {
1707 jint val = int_at(idx);
1708 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1709 break;
1710 }
1711 case JVM_CONSTANT_Float: {
1712 jfloat val = float_at(idx);
1713 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1714 break;
1715 }
1716 case JVM_CONSTANT_Long: {
1717 jlong val = long_at(idx);
1718 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1719 idx++; // Long takes two cpool slots
1720 break;
1721 }
1722 case JVM_CONSTANT_Double: {
1723 jdouble val = double_at(idx);
1724 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1725 idx++; // Double takes two cpool slots
1726 break;
1727 }
1728 case JVM_CONSTANT_Class:
1729 case JVM_CONSTANT_UnresolvedClass:
1730 case JVM_CONSTANT_UnresolvedClassInError: {
1731 *bytes = JVM_CONSTANT_Class;
1732 Symbol* sym = klass_name_at(idx);
1733 idx1 = tbl->symbol_to_value(sym);
1734 assert(idx1 != 0, "Have not found a hashtable entry");
1735 Bytes::put_Java_u2((address) (bytes+1), idx1);
1736 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1737 break;
1738 }
1739 case JVM_CONSTANT_String: {
1740 *bytes = JVM_CONSTANT_String;
1741 Symbol* sym = unresolved_string_at(idx);
1742 idx1 = tbl->symbol_to_value(sym);
1743 assert(idx1 != 0, "Have not found a hashtable entry");
1744 Bytes::put_Java_u2((address) (bytes+1), idx1);
1745 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1746 break;
1747 }
1748 case JVM_CONSTANT_Fieldref:
1749 case JVM_CONSTANT_Methodref:
1750 case JVM_CONSTANT_InterfaceMethodref: {
1751 idx1 = uncached_klass_ref_index_at(idx);
1752 idx2 = uncached_name_and_type_ref_index_at(idx);
1753 Bytes::put_Java_u2((address) (bytes+1), idx1);
1754 Bytes::put_Java_u2((address) (bytes+3), idx2);
1755 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1756 break;
1757 }
1758 case JVM_CONSTANT_NameAndType: {
1759 idx1 = name_ref_index_at(idx);
1760 idx2 = signature_ref_index_at(idx);
1761 Bytes::put_Java_u2((address) (bytes+1), idx1);
1762 Bytes::put_Java_u2((address) (bytes+3), idx2);
1763 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1764 break;
1765 }
1766 case JVM_CONSTANT_ClassIndex: {
1767 *bytes = JVM_CONSTANT_Class;
1768 idx1 = klass_index_at(idx);
1769 Bytes::put_Java_u2((address) (bytes+1), idx1);
1770 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1771 break;
1772 }
1773 case JVM_CONSTANT_StringIndex: {
1774 *bytes = JVM_CONSTANT_String;
1775 idx1 = string_index_at(idx);
1776 Bytes::put_Java_u2((address) (bytes+1), idx1);
1777 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1778 break;
1779 }
1780 case JVM_CONSTANT_MethodHandle:
1781 case JVM_CONSTANT_MethodHandleInError: {
1782 *bytes = JVM_CONSTANT_MethodHandle;
1783 int kind = method_handle_ref_kind_at(idx);
1784 idx1 = method_handle_index_at(idx);
1785 *(bytes+1) = (unsigned char) kind;
1786 Bytes::put_Java_u2((address) (bytes+2), idx1);
1787 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1788 break;
1789 }
1790 case JVM_CONSTANT_MethodType:
1791 case JVM_CONSTANT_MethodTypeInError: {
1792 *bytes = JVM_CONSTANT_MethodType;
1793 idx1 = method_type_index_at(idx);
1794 Bytes::put_Java_u2((address) (bytes+1), idx1);
1795 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1796 break;
1797 }
1798 case JVM_CONSTANT_InvokeDynamic: {
1799 *bytes = tag;
1800 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1801 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1802 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1803 Bytes::put_Java_u2((address) (bytes+1), idx1);
1804 Bytes::put_Java_u2((address) (bytes+3), idx2);
1805 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1806 break;
1807 }
1808 }
1809 DBG(printf("\n"));
1810 bytes += ent_size;
1811 size += ent_size;
1812 }
1813 assert(size == cpool_size, "Size mismatch");
1814
1815 // Keep temorarily for debugging until it's stable.
1816 DBG(print_cpool_bytes(cnt, start_bytes));
1817 return (int)(bytes - start_bytes);
1818 } /* end copy_cpool_bytes */
1819
1820 #undef DBG
1821
1822
1823 void ConstantPool::set_on_stack(const bool value) {
1824 if (value) {
1825 // Only record if it's not already set.
1826 if (!on_stack()) {
1827 _flags |= _on_stack;
1828 MetadataOnStackMark::record(this);
1829 }
1830 } else {
1831 // Clearing is done single-threadedly.
1832 _flags &= ~_on_stack;
1833 }
1834 }
1835
1836 // JSR 292 support for patching constant pool oops after the class is linked and
1837 // the oop array for resolved references are created.
1838 // We can't do this during classfile parsing, which is how the other indexes are
1839 // patched. The other patches are applied early for some error checking
1840 // so only defer the pseudo_strings.
1841 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
1842 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1843 Handle patch = cp_patches->at(index);
1844 if (patch.not_null()) {
1845 assert (tag_at(index).is_string(), "should only be string left");
1846 // Patching a string means pre-resolving it.
1847 // The spelling in the constant pool is ignored.
1848 // The constant reference may be any object whatever.
1849 // If it is not a real interned string, the constant is referred
1850 // to as a "pseudo-string", and must be presented to the CP
1851 // explicitly, because it may require scavenging.
1852 int obj_index = cp_to_object_index(index);
1853 pseudo_string_at_put(index, obj_index, patch());
1854 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1855 }
1856 }
1857 #ifdef ASSERT
1858 // Ensure that all the patches have been used.
1859 for (int index = 0; index < cp_patches->length(); index++) {
1860 assert(cp_patches->at(index).is_null(),
1861 "Unused constant pool patch at %d in class file %s",
1862 index,
1863 pool_holder()->external_name());
1864 }
1865 #endif // ASSERT
1866 }
1867
1868 #ifndef PRODUCT
1869
1870 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1871 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1872 guarantee(obj->is_constantPool(), "object must be constant pool");
1873 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1874 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1875
1876 for (int i = 0; i< cp->length(); i++) {
1877 if (cp->tag_at(i).is_unresolved_klass()) {
1878 // This will force loading of the class
1879 Klass* klass = cp->klass_at(i, CHECK);
1880 if (klass->is_instance_klass()) {
1881 // Force initialization of class
1882 InstanceKlass::cast(klass)->initialize(CHECK);
1883 }
1884 }
1885 }
1886 }
1887
1888 #endif
1889
1890
1891 // Printing
1892
1893 void ConstantPool::print_on(outputStream* st) const {
1894 assert(is_constantPool(), "must be constantPool");
1895 st->print_cr("%s", internal_name());
1896 if (flags() != 0) {
1897 st->print(" - flags: 0x%x", flags());
1898 if (has_preresolution()) st->print(" has_preresolution");
1899 if (on_stack()) st->print(" on_stack");
1900 st->cr();
1901 }
1902 if (pool_holder() != NULL) {
1903 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
1904 }
1905 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
1906 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
1907 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
1908
1909 for (int index = 1; index < length(); index++) { // Index 0 is unused
1910 ((ConstantPool*)this)->print_entry_on(index, st);
1911 switch (tag_at(index).value()) {
1912 case JVM_CONSTANT_Long :
1913 case JVM_CONSTANT_Double :
1914 index++; // Skip entry following eigth-byte constant
1915 }
1916
1917 }
1918 st->cr();
1919 }
1920
1921 // Print one constant pool entry
1922 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1923 EXCEPTION_MARK;
1924 st->print(" - %3d : ", index);
1925 tag_at(index).print_on(st);
1926 st->print(" : ");
1927 switch (tag_at(index).value()) {
1928 case JVM_CONSTANT_Class :
1929 { Klass* k = klass_at(index, CATCH);
1930 guarantee(k != NULL, "need klass");
1931 k->print_value_on(st);
1932 st->print(" {" PTR_FORMAT "}", p2i(k));
1933 }
1934 break;
1935 case JVM_CONSTANT_Fieldref :
1936 case JVM_CONSTANT_Methodref :
1937 case JVM_CONSTANT_InterfaceMethodref :
1938 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1939 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1940 break;
1941 case JVM_CONSTANT_String :
1942 if (is_pseudo_string_at(index)) {
1943 oop anObj = pseudo_string_at(index);
1944 anObj->print_value_on(st);
1945 st->print(" {" PTR_FORMAT "}", p2i(anObj));
1946 } else {
1947 unresolved_string_at(index)->print_value_on(st);
1948 }
1949 break;
1950 case JVM_CONSTANT_Integer :
1951 st->print("%d", int_at(index));
1952 break;
1953 case JVM_CONSTANT_Float :
1954 st->print("%f", float_at(index));
1955 break;
1956 case JVM_CONSTANT_Long :
1957 st->print_jlong(long_at(index));
1958 break;
1959 case JVM_CONSTANT_Double :
1960 st->print("%lf", double_at(index));
1961 break;
1962 case JVM_CONSTANT_NameAndType :
1963 st->print("name_index=%d", name_ref_index_at(index));
1964 st->print(" signature_index=%d", signature_ref_index_at(index));
1965 break;
1966 case JVM_CONSTANT_Utf8 :
1967 symbol_at(index)->print_value_on(st);
1968 break;
1969 case JVM_CONSTANT_UnresolvedClass : // fall-through
1970 case JVM_CONSTANT_UnresolvedClassInError: {
1971 CPSlot entry = slot_at(index);
1972 if (entry.is_resolved()) {
1973 entry.get_klass()->print_value_on(st);
1974 } else {
1975 entry.get_symbol()->print_value_on(st);
1976 }
1977 }
1978 break;
1979 case JVM_CONSTANT_MethodHandle :
1980 case JVM_CONSTANT_MethodHandleInError :
1981 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
1982 st->print(" ref_index=%d", method_handle_index_at(index));
1983 break;
1984 case JVM_CONSTANT_MethodType :
1985 case JVM_CONSTANT_MethodTypeInError :
1986 st->print("signature_index=%d", method_type_index_at(index));
1987 break;
1988 case JVM_CONSTANT_InvokeDynamic :
1989 {
1990 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1991 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1992 int argc = invoke_dynamic_argument_count_at(index);
1993 if (argc > 0) {
1994 for (int arg_i = 0; arg_i < argc; arg_i++) {
1995 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1996 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1997 }
1998 st->print("}");
1999 }
2000 }
2001 break;
2002 default:
2003 ShouldNotReachHere();
2004 break;
2005 }
2006 st->cr();
2007 }
2008
2009 void ConstantPool::print_value_on(outputStream* st) const {
2010 assert(is_constantPool(), "must be constantPool");
2011 st->print("constant pool [%d]", length());
2012 if (has_preresolution()) st->print("/preresolution");
2013 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2014 print_address_on(st);
2015 st->print(" for ");
2016 pool_holder()->print_value_on(st);
2017 if (pool_holder() != NULL) {
2018 bool extra = (pool_holder()->constants() != this);
2019 if (extra) st->print(" (extra)");
2020 }
2021 if (cache() != NULL) {
2022 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2023 }
2024 }
2025
2026 #if INCLUDE_SERVICES
2027 // Size Statistics
2028 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2029 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2030 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2031 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2032 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2033 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2034
2035 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2036 sz->_cp_refmap_bytes;
2037 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2038 }
2039 #endif // INCLUDE_SERVICES
2040
2041 // Verification
2042
2043 void ConstantPool::verify_on(outputStream* st) {
2044 guarantee(is_constantPool(), "object must be constant pool");
2045 for (int i = 0; i< length(); i++) {
2046 constantTag tag = tag_at(i);
2047 CPSlot entry = slot_at(i);
2048 if (tag.is_klass()) {
2049 if (entry.is_resolved()) {
2050 guarantee(entry.get_klass()->is_klass(), "should be klass");
2051 }
2052 } else if (tag.is_unresolved_klass()) {
2053 if (entry.is_resolved()) {
2054 guarantee(entry.get_klass()->is_klass(), "should be klass");
2055 }
2056 } else if (tag.is_symbol()) {
2057 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2058 } else if (tag.is_string()) {
2059 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2060 }
2061 }
2062 if (cache() != NULL) {
2063 // Note: cache() can be NULL before a class is completely setup or
2064 // in temporary constant pools used during constant pool merging
2065 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2066 }
2067 if (pool_holder() != NULL) {
2068 // Note: pool_holder() can be NULL in temporary constant pools
2069 // used during constant pool merging
2070 guarantee(pool_holder()->is_klass(), "should be klass");
2071 }
2072 }
2073
2074
2075 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2076 char *str = sym->as_utf8();
2077 unsigned int hash = compute_hash(str, sym->utf8_length());
2078 unsigned int index = hash % table_size();
2079
2080 // check if already in map
2081 // we prefer the first entry since it is more likely to be what was used in
2082 // the class file
2083 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2084 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2085 if (en->hash() == hash && en->symbol() == sym) {
2086 return; // already there
2087 }
2088 }
2089
2090 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2091 entry->set_next(bucket(index));
2092 _buckets[index].set_entry(entry);
2093 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2094 }
2095
2096 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2097 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2098 char *str = sym->as_utf8();
2099 int len = sym->utf8_length();
2100 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2101 unsigned int index = hash % table_size();
2102 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2103 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2104 if (en->hash() == hash && en->symbol() == sym) {
2105 return en;
2106 }
2107 }
2108 return NULL;
2109 }