1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/metadataOnStackMark.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/heapInspection.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "oops/constantPool.hpp"
37 #include "oops/instanceKlass.hpp"
38 #include "oops/objArrayKlass.hpp"
39 #include "oops/objArrayOop.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "runtime/fieldType.hpp"
42 #include "runtime/init.hpp"
43 #include "runtime/javaCalls.hpp"
44 #include "runtime/signature.hpp"
45 #include "runtime/vframe.hpp"
46 #include "utilities/copy.hpp"
47
48 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
49 // Tags are RW but comment below applies to tags also.
50 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
51
52 int size = ConstantPool::size(length);
53
54 // CDS considerations:
55 // Allocate read-write but may be able to move to read-only at dumping time
56 // if all the klasses are resolved. The only other field that is writable is
57 // the resolved_references array, which is recreated at startup time.
58 // But that could be moved to InstanceKlass (although a pain to access from
59 // assembly code). Maybe it could be moved to the cpCache which is RW.
60 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
61 }
62
63 #ifdef ASSERT
64
65 // MetaspaceObj allocation invariant is calloc equivalent memory
66 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
67 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
68 assert(tags != NULL, "invariant");
69 const int length = tags->length();
70 for (int index = 0; index < length; ++index) {
71 if (JVM_CONSTANT_Invalid != tags->at(index)) {
72 return false;
73 }
74 }
75 return true;
76 }
77
78 #endif
79
80 ConstantPool::ConstantPool(Array<u1>* tags) :
81 _tags(tags),
82 _length(tags->length()) {
83
84 assert(_tags != NULL, "invariant");
85 assert(tags->length() == _length, "invariant");
86 assert(tag_array_is_zero_initialized(tags), "invariant");
87 assert(0 == _flags, "invariant");
88 assert(0 == version(), "invariant");
89 assert(NULL == _pool_holder, "invariant");
90 }
91
92 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
93 MetadataFactory::free_metadata(loader_data, cache());
94 set_cache(NULL);
95 MetadataFactory::free_array<u2>(loader_data, reference_map());
96 set_reference_map(NULL);
97
98 MetadataFactory::free_array<jushort>(loader_data, operands());
99 set_operands(NULL);
100
101 release_C_heap_structures();
102
103 // free tag array
104 MetadataFactory::free_array<u1>(loader_data, tags());
105 set_tags(NULL);
106 }
107
108 void ConstantPool::release_C_heap_structures() {
109 // walk constant pool and decrement symbol reference counts
110 unreference_symbols();
111 }
112
113 objArrayOop ConstantPool::resolved_references() const {
114 return (objArrayOop)JNIHandles::resolve(_resolved_references);
115 }
116
117 // Create resolved_references array and mapping array for original cp indexes
118 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
119 // to map it back for resolving and some unlikely miscellaneous uses.
120 // The objects created by invokedynamic are appended to this list.
121 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
122 const intStack& reference_map,
123 int constant_pool_map_length,
124 TRAPS) {
125 // Initialized the resolved object cache.
126 int map_length = reference_map.length();
127 if (map_length > 0) {
128 // Only need mapping back to constant pool entries. The map isn't used for
129 // invokedynamic resolved_reference entries. For invokedynamic entries,
130 // the constant pool cache index has the mapping back to both the constant
131 // pool and to the resolved reference index.
132 if (constant_pool_map_length > 0) {
133 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
134
135 for (int i = 0; i < constant_pool_map_length; i++) {
136 int x = reference_map.at(i);
137 assert(x == (int)(jushort) x, "klass index is too big");
138 om->at_put(i, (jushort)x);
139 }
140 set_reference_map(om);
141 }
142
143 // Create Java array for holding resolved strings, methodHandles,
144 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
145 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
146 Handle refs_handle (THREAD, (oop)stom); // must handleize.
147 set_resolved_references(loader_data->add_handle(refs_handle));
148 }
149 }
150
151 // CDS support. Create a new resolved_references array.
152 void ConstantPool::restore_unshareable_info(TRAPS) {
153
154 // Only create the new resolved references array if it hasn't been attempted before
155 if (resolved_references() != NULL) return;
156
157 // restore the C++ vtable from the shared archive
158 restore_vtable();
159
160 if (SystemDictionary::Object_klass_loaded()) {
161 // Recreate the object array and add to ClassLoaderData.
162 int map_length = resolved_reference_length();
163 if (map_length > 0) {
164 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
165 Handle refs_handle (THREAD, (oop)stom); // must handleize.
166
167 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
168 set_resolved_references(loader_data->add_handle(refs_handle));
169 }
170 }
171 }
172
173 void ConstantPool::remove_unshareable_info() {
174 // Resolved references are not in the shared archive.
175 // Save the length for restoration. It is not necessarily the same length
176 // as reference_map.length() if invokedynamic is saved.
177 set_resolved_reference_length(
178 resolved_references() != NULL ? resolved_references()->length() : 0);
179 set_resolved_references(NULL);
180 }
181
182 int ConstantPool::cp_to_object_index(int cp_index) {
183 // this is harder don't do this so much.
184 int i = reference_map()->find(cp_index);
185 // We might not find the index for jsr292 call.
186 return (i < 0) ? _no_index_sentinel : i;
187 }
188
189 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, KlassHandle k) {
190 ResourceMark rm;
191 int line_number = -1;
192 const char * source_file = NULL;
193 if (JavaThread::current()->has_last_Java_frame()) {
194 // try to identify the method which called this function.
195 vframeStream vfst(JavaThread::current());
196 if (!vfst.at_end()) {
197 line_number = vfst.method()->line_number_from_bci(vfst.bci());
198 Symbol* s = vfst.method()->method_holder()->source_file_name();
199 if (s != NULL) {
200 source_file = s->as_C_string();
201 }
202 }
203 }
204 if (k() != this_cp->pool_holder()) {
205 // only print something if the classes are different
206 if (source_file != NULL) {
207 tty->print("RESOLVE %s %s %s:%d\n",
208 this_cp->pool_holder()->external_name(),
209 k->external_name(), source_file, line_number);
210 } else {
211 tty->print("RESOLVE %s %s\n",
212 this_cp->pool_holder()->external_name(),
213 k->external_name());
214 }
215 }
216 }
217
218 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
219 bool save_resolution_error, TRAPS) {
220 assert(THREAD->is_Java_thread(), "must be a Java thread");
221
222 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
223 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
224 // the entry and tag is not updated atomicly.
225 CPSlot entry = this_cp->slot_at(which);
226 if (entry.is_resolved()) {
227 assert(entry.get_klass()->is_klass(), "must be");
228 // Already resolved - return entry.
229 return entry.get_klass();
230 }
231
232 // This tag doesn't change back to unresolved class unless at a safepoint.
233 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
234 // The original attempt to resolve this constant pool entry failed so find the
235 // class of the original error and throw another error of the same class
236 // (JVMS 5.4.3).
237 // If there is a detail message, pass that detail message to the error.
238 // The JVMS does not strictly require us to duplicate the same detail message,
239 // or any internal exception fields such as cause or stacktrace. But since the
240 // detail message is often a class name or other literal string, we will repeat it
241 // if we can find it in the symbol table.
242 throw_resolution_error(this_cp, which, CHECK_0);
243 ShouldNotReachHere();
244 }
245
246 Handle mirror_handle;
247 Symbol* name = entry.get_symbol();
248 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
249 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
250 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
251 KlassHandle k (THREAD, kk);
252 if (!HAS_PENDING_EXCEPTION) {
253 // preserve the resolved klass from unloading
254 mirror_handle = Handle(THREAD, kk->java_mirror());
255 // Do access check for klasses
256 verify_constant_pool_resolve(this_cp, k, THREAD);
257 }
258
259 // Failed to resolve class. We must record the errors so that subsequent attempts
260 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
261 if (HAS_PENDING_EXCEPTION) {
262 if (save_resolution_error) {
263 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
264 // If CHECK_NULL above doesn't return the exception, that means that
265 // some other thread has beaten us and has resolved the class.
266 // To preserve old behavior, we return the resolved class.
267 entry = this_cp->resolved_klass_at(which);
268 assert(entry.is_resolved(), "must be resolved if exception was cleared");
269 assert(entry.get_klass()->is_klass(), "must be resolved to a klass");
270 return entry.get_klass();
271 } else {
272 return NULL; // return the pending exception
273 }
274 }
275
276 // Make this class loader depend upon the class loader owning the class reference
277 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
278 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
279
280 if (TraceClassResolution && !k->is_array_klass()) {
281 // skip resolving the constant pool so that this code gets
282 // called the next time some bytecodes refer to this class.
283 trace_class_resolution(this_cp, k);
284 return k();
285 } else {
286 this_cp->klass_at_put(which, k());
287 }
288
289 entry = this_cp->resolved_klass_at(which);
290 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
291 return entry.get_klass();
292 }
293
294
295 // Does not update ConstantPool* - to avoid any exception throwing. Used
296 // by compiler and exception handling. Also used to avoid classloads for
297 // instanceof operations. Returns NULL if the class has not been loaded or
298 // if the verification of constant pool failed
299 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
300 CPSlot entry = this_cp->slot_at(which);
301 if (entry.is_resolved()) {
302 assert(entry.get_klass()->is_klass(), "must be");
303 return entry.get_klass();
304 } else {
305 assert(entry.is_unresolved(), "must be either symbol or klass");
306 Thread *thread = Thread::current();
307 Symbol* name = entry.get_symbol();
308 oop loader = this_cp->pool_holder()->class_loader();
309 oop protection_domain = this_cp->pool_holder()->protection_domain();
310 Handle h_prot (thread, protection_domain);
311 Handle h_loader (thread, loader);
312 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
313
314 if (k != NULL) {
315 // Make sure that resolving is legal
316 EXCEPTION_MARK;
317 KlassHandle klass(THREAD, k);
318 // return NULL if verification fails
319 verify_constant_pool_resolve(this_cp, klass, THREAD);
320 if (HAS_PENDING_EXCEPTION) {
321 CLEAR_PENDING_EXCEPTION;
322 return NULL;
323 }
324 return klass();
325 } else {
326 return k;
327 }
328 }
329 }
330
331
332 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) {
333 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which));
334 }
335
336
337 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
338 int which) {
339 if (cpool->cache() == NULL) return NULL; // nothing to load yet
340 int cache_index = decode_cpcache_index(which, true);
341 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
342 // FIXME: should be an assert
343 if (PrintMiscellaneous && (Verbose||WizardMode)) {
344 tty->print_cr("bad operand %d in:", which); cpool->print();
345 }
346 return NULL;
347 }
348 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
349 return e->method_if_resolved(cpool);
350 }
351
352
353 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
354 if (cpool->cache() == NULL) return false; // nothing to load yet
355 int cache_index = decode_cpcache_index(which, true);
356 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
357 return e->has_appendix();
358 }
359
360 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
361 if (cpool->cache() == NULL) return NULL; // nothing to load yet
362 int cache_index = decode_cpcache_index(which, true);
363 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
364 return e->appendix_if_resolved(cpool);
365 }
366
367
368 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
369 if (cpool->cache() == NULL) return false; // nothing to load yet
370 int cache_index = decode_cpcache_index(which, true);
371 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
372 return e->has_method_type();
373 }
374
375 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
376 if (cpool->cache() == NULL) return NULL; // nothing to load yet
377 int cache_index = decode_cpcache_index(which, true);
378 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
379 return e->method_type_if_resolved(cpool);
380 }
381
382
383 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
384 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
385 return symbol_at(name_index);
386 }
387
388
389 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
390 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
391 return symbol_at(signature_index);
392 }
393
394
395 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
396 int i = which;
397 if (!uncached && cache() != NULL) {
398 if (ConstantPool::is_invokedynamic_index(which)) {
399 // Invokedynamic index is index into resolved_references
400 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
401 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
402 assert(tag_at(pool_index).is_name_and_type(), "");
403 return pool_index;
404 }
405 // change byte-ordering and go via cache
406 i = remap_instruction_operand_from_cache(which);
407 } else {
408 if (tag_at(which).is_invoke_dynamic()) {
409 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
410 assert(tag_at(pool_index).is_name_and_type(), "");
411 return pool_index;
412 }
413 }
414 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
415 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
416 jint ref_index = *int_at_addr(i);
417 return extract_high_short_from_int(ref_index);
418 }
419
420 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
421 int pool_index = which;
422 if (!uncached && cache() != NULL) {
423 if (ConstantPool::is_invokedynamic_index(which)) {
424 // Invokedynamic index is index into resolved_references
425 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
426 } else {
427 // change byte-ordering and go via cache
428 pool_index = remap_instruction_operand_from_cache(which);
429 }
430 }
431 return tag_at(pool_index);
432 }
433
434 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
435 guarantee(!ConstantPool::is_invokedynamic_index(which),
436 "an invokedynamic instruction does not have a klass");
437 int i = which;
438 if (!uncached && cache() != NULL) {
439 // change byte-ordering and go via cache
440 i = remap_instruction_operand_from_cache(which);
441 }
442 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
443 jint ref_index = *int_at_addr(i);
444 return extract_low_short_from_int(ref_index);
445 }
446
447
448
449 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
450 int cpc_index = operand;
451 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
452 assert((int)(u2)cpc_index == cpc_index, "clean u2");
453 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
454 return member_index;
455 }
456
457
458 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, KlassHandle k, TRAPS) {
459 if (k->is_instance_klass() || k->is_objArray_klass()) {
460 instanceKlassHandle holder (THREAD, this_cp->pool_holder());
461 Klass* elem = k->is_instance_klass() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
462 KlassHandle element (THREAD, elem);
463
464 // The element type could be a typeArray - we only need the access check if it is
465 // an reference to another class
466 if (element->is_instance_klass()) {
467 LinkResolver::check_klass_accessability(holder, element, CHECK);
468 }
469 }
470 }
471
472
473 int ConstantPool::name_ref_index_at(int which_nt) {
474 jint ref_index = name_and_type_at(which_nt);
475 return extract_low_short_from_int(ref_index);
476 }
477
478
479 int ConstantPool::signature_ref_index_at(int which_nt) {
480 jint ref_index = name_and_type_at(which_nt);
481 return extract_high_short_from_int(ref_index);
482 }
483
484
485 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
486 return klass_at(klass_ref_index_at(which), THREAD);
487 }
488
489
490 Symbol* ConstantPool::klass_name_at(int which) const {
491 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
492 "Corrupted constant pool");
493 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
494 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
495 // tag is not updated atomicly.
496 CPSlot entry = slot_at(which);
497 if (entry.is_resolved()) {
498 // Already resolved - return entry's name.
499 assert(entry.get_klass()->is_klass(), "must be");
500 return entry.get_klass()->name();
501 } else {
502 assert(entry.is_unresolved(), "must be either symbol or klass");
503 return entry.get_symbol();
504 }
505 }
506
507 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
508 jint ref_index = klass_ref_index_at(which);
509 return klass_at_noresolve(ref_index);
510 }
511
512 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
513 jint ref_index = uncached_klass_ref_index_at(which);
514 return klass_at_noresolve(ref_index);
515 }
516
517 char* ConstantPool::string_at_noresolve(int which) {
518 return unresolved_string_at(which)->as_C_string();
519 }
520
521 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
522 return FieldType::basic_type(symbol_at(which));
523 }
524
525
526 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
527 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
528 if (this_cp->tag_at(index).is_string()) {
529 this_cp->string_at(index, CHECK);
530 }
531 }
532 }
533
534 // Resolve all the classes in the constant pool. If they are all resolved,
535 // the constant pool is read-only. Enhancement: allocate cp entries to
536 // another metaspace, and copy to read-only or read-write space if this
537 // bit is set.
538 bool ConstantPool::resolve_class_constants(TRAPS) {
539 constantPoolHandle cp(THREAD, this);
540 for (int index = 1; index < length(); index++) { // Index 0 is unused
541 if (tag_at(index).is_unresolved_klass() &&
542 klass_at_if_loaded(cp, index) == NULL) {
543 return false;
544 }
545 }
546 // set_preresolution(); or some bit for future use
547 return true;
548 }
549
550 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
551 // Dig out the detailed message to reuse if possible
552 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
553 if (message != NULL) {
554 return message;
555 }
556
557 // Return specific message for the tag
558 switch (tag.value()) {
559 case JVM_CONSTANT_UnresolvedClass:
560 // return the class name in the error message
561 message = this_cp->klass_name_at(which);
562 break;
563 case JVM_CONSTANT_MethodHandle:
564 // return the method handle name in the error message
565 message = this_cp->method_handle_name_ref_at(which);
566 break;
567 case JVM_CONSTANT_MethodType:
568 // return the method type signature in the error message
569 message = this_cp->method_type_signature_at(which);
570 break;
571 default:
572 ShouldNotReachHere();
573 }
574
575 return message;
576 }
577
578 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
579 Symbol* message = NULL;
580 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
581 assert(error != NULL && message != NULL, "checking");
582 CLEAR_PENDING_EXCEPTION;
583 ResourceMark rm;
584 THROW_MSG(error, message->as_C_string());
585 }
586
587 // If resolution for Class, MethodHandle or MethodType fails, save the exception
588 // in the resolution error table, so that the same exception is thrown again.
589 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
590 constantTag tag, TRAPS) {
591 Symbol* error = PENDING_EXCEPTION->klass()->name();
592
593 int error_tag = tag.error_value();
594
595 if (!PENDING_EXCEPTION->
596 is_a(SystemDictionary::LinkageError_klass())) {
597 // Just throw the exception and don't prevent these classes from
598 // being loaded due to virtual machine errors like StackOverflow
599 // and OutOfMemoryError, etc, or if the thread was hit by stop()
600 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
601 } else if (this_cp->tag_at(which).value() != error_tag) {
602 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
603 SystemDictionary::add_resolution_error(this_cp, which, error, message);
604 // CAS in the tag. If a thread beat us to registering this error that's fine.
605 // If another thread resolved the reference, this is a race condition. This
606 // thread may have had a security manager or something temporary.
607 // This doesn't deterministically get an error. So why do we save this?
608 // We save this because jvmti can add classes to the bootclass path after
609 // this error, so it needs to get the same error if the error is first.
610 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
611 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
612 if (old_tag != error_tag && old_tag != tag.value()) {
613 // MethodHandles and MethodType doesn't change to resolved version.
614 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
615 // Forget the exception and use the resolved class.
616 CLEAR_PENDING_EXCEPTION;
617 }
618 } else {
619 // some other thread put this in error state
620 throw_resolution_error(this_cp, which, CHECK);
621 }
622 }
623
624 // Called to resolve constants in the constant pool and return an oop.
625 // Some constant pool entries cache their resolved oop. This is also
626 // called to create oops from constants to use in arguments for invokedynamic
627 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) {
628 oop result_oop = NULL;
629 Handle throw_exception;
630
631 if (cache_index == _possible_index_sentinel) {
632 // It is possible that this constant is one which is cached in the objects.
633 // We'll do a linear search. This should be OK because this usage is rare.
634 assert(index > 0, "valid index");
635 cache_index = this_cp->cp_to_object_index(index);
636 }
637 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
638 assert(index == _no_index_sentinel || index >= 0, "");
639
640 if (cache_index >= 0) {
641 result_oop = this_cp->resolved_references()->obj_at(cache_index);
642 if (result_oop != NULL) {
643 return result_oop;
644 // That was easy...
645 }
646 index = this_cp->object_to_cp_index(cache_index);
647 }
648
649 jvalue prim_value; // temp used only in a few cases below
650
651 constantTag tag = this_cp->tag_at(index);
652
653 switch (tag.value()) {
654
655 case JVM_CONSTANT_UnresolvedClass:
656 case JVM_CONSTANT_UnresolvedClassInError:
657 case JVM_CONSTANT_Class:
658 {
659 assert(cache_index == _no_index_sentinel, "should not have been set");
660 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
661 // ldc wants the java mirror.
662 result_oop = resolved->java_mirror();
663 break;
664 }
665
666 case JVM_CONSTANT_String:
667 assert(cache_index != _no_index_sentinel, "should have been set");
668 if (this_cp->is_pseudo_string_at(index)) {
669 result_oop = this_cp->pseudo_string_at(index, cache_index);
670 break;
671 }
672 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
673 break;
674
675 case JVM_CONSTANT_MethodHandleInError:
676 case JVM_CONSTANT_MethodTypeInError:
677 {
678 throw_resolution_error(this_cp, index, CHECK_NULL);
679 break;
680 }
681
682 case JVM_CONSTANT_MethodHandle:
683 {
684 int ref_kind = this_cp->method_handle_ref_kind_at(index);
685 int callee_index = this_cp->method_handle_klass_index_at(index);
686 Symbol* name = this_cp->method_handle_name_ref_at(index);
687 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
688 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
689 if (PrintMiscellaneous)
690 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
691 ref_kind, index, this_cp->method_handle_index_at(index),
692 callee_index, name->as_C_string(), signature->as_C_string());
693 KlassHandle callee;
694 { Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
695 callee = KlassHandle(THREAD, k);
696 }
697 // Check tag consistency, relax for interface static default method.
698 if ((callee->is_interface() && !m_tag.is_interface_method() &&
699 (ref_kind != JVM_REF_invokeStatic)) ||
700 (!callee->is_interface() && m_tag.is_interface_method())) {
701 ResourceMark rm(THREAD);
702 char buf[200];
703 jio_snprintf(buf, sizeof(buf), "Inconsistent constant data for %s.%s%s at index %d",
704 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index);
705 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
706 }
707
708 KlassHandle klass(THREAD, this_cp->pool_holder());
709 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
710 callee, name, signature,
711 THREAD);
712 result_oop = value();
713 if (HAS_PENDING_EXCEPTION) {
714 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
715 }
716 break;
717 }
718
719 case JVM_CONSTANT_MethodType:
720 {
721 Symbol* signature = this_cp->method_type_signature_at(index);
722 if (PrintMiscellaneous)
723 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
724 index, this_cp->method_type_index_at(index),
725 signature->as_C_string());
726 KlassHandle klass(THREAD, this_cp->pool_holder());
727 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
728 result_oop = value();
729 if (HAS_PENDING_EXCEPTION) {
730 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
731 }
732 break;
733 }
734
735 case JVM_CONSTANT_Integer:
736 assert(cache_index == _no_index_sentinel, "should not have been set");
737 prim_value.i = this_cp->int_at(index);
738 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
739 break;
740
741 case JVM_CONSTANT_Float:
742 assert(cache_index == _no_index_sentinel, "should not have been set");
743 prim_value.f = this_cp->float_at(index);
744 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
745 break;
746
747 case JVM_CONSTANT_Long:
748 assert(cache_index == _no_index_sentinel, "should not have been set");
749 prim_value.j = this_cp->long_at(index);
750 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
751 break;
752
753 case JVM_CONSTANT_Double:
754 assert(cache_index == _no_index_sentinel, "should not have been set");
755 prim_value.d = this_cp->double_at(index);
756 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
757 break;
758
759 default:
760 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
761 this_cp(), index, cache_index, tag.value()));
762 assert(false, "unexpected constant tag");
763 break;
764 }
765
766 if (cache_index >= 0) {
767 // Benign race condition: resolved_references may already be filled in.
768 // The important thing here is that all threads pick up the same result.
769 // It doesn't matter which racing thread wins, as long as only one
770 // result is used by all threads, and all future queries.
771 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL);
772 if (old_result == NULL) {
773 return result_oop; // was installed
774 } else {
775 // Return the winning thread's result. This can be different than
776 // the result here for MethodHandles.
777 return old_result;
778 }
779 } else {
780 return result_oop;
781 }
782 }
783
784 oop ConstantPool::uncached_string_at(int which, TRAPS) {
785 Symbol* sym = unresolved_string_at(which);
786 oop str = StringTable::intern(sym, CHECK_(NULL));
787 assert(java_lang_String::is_instance(str), "must be string");
788 return str;
789 }
790
791
792 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) {
793 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
794
795 Handle bsm;
796 int argc;
797 {
798 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
799 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
800 // It is accompanied by the optional arguments.
801 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
802 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
803 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
804 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
805 }
806
807 // Extract the optional static arguments.
808 argc = this_cp->invoke_dynamic_argument_count_at(index);
809 if (argc == 0) return bsm_oop;
810
811 bsm = Handle(THREAD, bsm_oop);
812 }
813
814 objArrayHandle info;
815 {
816 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
817 info = objArrayHandle(THREAD, info_oop);
818 }
819
820 info->obj_at_put(0, bsm());
821 for (int i = 0; i < argc; i++) {
822 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
823 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
824 info->obj_at_put(1+i, arg_oop);
825 }
826
827 return info();
828 }
829
830 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
831 // If the string has already been interned, this entry will be non-null
832 oop str = this_cp->resolved_references()->obj_at(obj_index);
833 if (str != NULL) return str;
834 Symbol* sym = this_cp->unresolved_string_at(which);
835 str = StringTable::intern(sym, CHECK_(NULL));
836 this_cp->string_at_put(which, obj_index, str);
837 assert(java_lang_String::is_instance(str), "must be string");
838 return str;
839 }
840
841
842 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
843 int which) {
844 // Names are interned, so we can compare Symbol*s directly
845 Symbol* cp_name = klass_name_at(which);
846 return (cp_name == k->name());
847 }
848
849
850 // Iterate over symbols and decrement ones which are Symbol*s
851 // This is done during GC.
852 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
853 // these symbols but didn't increment the reference count.
854 void ConstantPool::unreference_symbols() {
855 for (int index = 1; index < length(); index++) { // Index 0 is unused
856 constantTag tag = tag_at(index);
857 if (tag.is_symbol()) {
858 symbol_at(index)->decrement_refcount();
859 }
860 }
861 }
862
863
864 // Compare this constant pool's entry at index1 to the constant pool
865 // cp2's entry at index2.
866 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
867 int index2, TRAPS) {
868
869 // The error tags are equivalent to non-error tags when comparing
870 jbyte t1 = tag_at(index1).non_error_value();
871 jbyte t2 = cp2->tag_at(index2).non_error_value();
872
873 if (t1 != t2) {
874 // Not the same entry type so there is nothing else to check. Note
875 // that this style of checking will consider resolved/unresolved
876 // class pairs as different.
877 // From the ConstantPool* API point of view, this is correct
878 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
879 // plays out in the context of ConstantPool* merging.
880 return false;
881 }
882
883 switch (t1) {
884 case JVM_CONSTANT_Class:
885 {
886 Klass* k1 = klass_at(index1, CHECK_false);
887 Klass* k2 = cp2->klass_at(index2, CHECK_false);
888 if (k1 == k2) {
889 return true;
890 }
891 } break;
892
893 case JVM_CONSTANT_ClassIndex:
894 {
895 int recur1 = klass_index_at(index1);
896 int recur2 = cp2->klass_index_at(index2);
897 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
898 if (match) {
899 return true;
900 }
901 } break;
902
903 case JVM_CONSTANT_Double:
904 {
905 jdouble d1 = double_at(index1);
906 jdouble d2 = cp2->double_at(index2);
907 if (d1 == d2) {
908 return true;
909 }
910 } break;
911
912 case JVM_CONSTANT_Fieldref:
913 case JVM_CONSTANT_InterfaceMethodref:
914 case JVM_CONSTANT_Methodref:
915 {
916 int recur1 = uncached_klass_ref_index_at(index1);
917 int recur2 = cp2->uncached_klass_ref_index_at(index2);
918 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
919 if (match) {
920 recur1 = uncached_name_and_type_ref_index_at(index1);
921 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
922 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
923 if (match) {
924 return true;
925 }
926 }
927 } break;
928
929 case JVM_CONSTANT_Float:
930 {
931 jfloat f1 = float_at(index1);
932 jfloat f2 = cp2->float_at(index2);
933 if (f1 == f2) {
934 return true;
935 }
936 } break;
937
938 case JVM_CONSTANT_Integer:
939 {
940 jint i1 = int_at(index1);
941 jint i2 = cp2->int_at(index2);
942 if (i1 == i2) {
943 return true;
944 }
945 } break;
946
947 case JVM_CONSTANT_Long:
948 {
949 jlong l1 = long_at(index1);
950 jlong l2 = cp2->long_at(index2);
951 if (l1 == l2) {
952 return true;
953 }
954 } break;
955
956 case JVM_CONSTANT_NameAndType:
957 {
958 int recur1 = name_ref_index_at(index1);
959 int recur2 = cp2->name_ref_index_at(index2);
960 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
961 if (match) {
962 recur1 = signature_ref_index_at(index1);
963 recur2 = cp2->signature_ref_index_at(index2);
964 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
965 if (match) {
966 return true;
967 }
968 }
969 } break;
970
971 case JVM_CONSTANT_StringIndex:
972 {
973 int recur1 = string_index_at(index1);
974 int recur2 = cp2->string_index_at(index2);
975 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
976 if (match) {
977 return true;
978 }
979 } break;
980
981 case JVM_CONSTANT_UnresolvedClass:
982 {
983 Symbol* k1 = klass_name_at(index1);
984 Symbol* k2 = cp2->klass_name_at(index2);
985 if (k1 == k2) {
986 return true;
987 }
988 } break;
989
990 case JVM_CONSTANT_MethodType:
991 {
992 int k1 = method_type_index_at_error_ok(index1);
993 int k2 = cp2->method_type_index_at_error_ok(index2);
994 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
995 if (match) {
996 return true;
997 }
998 } break;
999
1000 case JVM_CONSTANT_MethodHandle:
1001 {
1002 int k1 = method_handle_ref_kind_at_error_ok(index1);
1003 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2);
1004 if (k1 == k2) {
1005 int i1 = method_handle_index_at_error_ok(index1);
1006 int i2 = cp2->method_handle_index_at_error_ok(index2);
1007 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1008 if (match) {
1009 return true;
1010 }
1011 }
1012 } break;
1013
1014 case JVM_CONSTANT_InvokeDynamic:
1015 {
1016 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1017 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1018 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1019 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1020 // separate statements and variables because CHECK_false is used
1021 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1022 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1023 return (match_entry && match_operand);
1024 } break;
1025
1026 case JVM_CONSTANT_String:
1027 {
1028 Symbol* s1 = unresolved_string_at(index1);
1029 Symbol* s2 = cp2->unresolved_string_at(index2);
1030 if (s1 == s2) {
1031 return true;
1032 }
1033 } break;
1034
1035 case JVM_CONSTANT_Utf8:
1036 {
1037 Symbol* s1 = symbol_at(index1);
1038 Symbol* s2 = cp2->symbol_at(index2);
1039 if (s1 == s2) {
1040 return true;
1041 }
1042 } break;
1043
1044 // Invalid is used as the tag for the second constant pool entry
1045 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1046 // not be seen by itself.
1047 case JVM_CONSTANT_Invalid: // fall through
1048
1049 default:
1050 ShouldNotReachHere();
1051 break;
1052 }
1053
1054 return false;
1055 } // end compare_entry_to()
1056
1057
1058 // Resize the operands array with delta_len and delta_size.
1059 // Used in RedefineClasses for CP merge.
1060 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1061 int old_len = operand_array_length(operands());
1062 int new_len = old_len + delta_len;
1063 int min_len = (delta_len > 0) ? old_len : new_len;
1064
1065 int old_size = operands()->length();
1066 int new_size = old_size + delta_size;
1067 int min_size = (delta_size > 0) ? old_size : new_size;
1068
1069 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1070 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1071
1072 // Set index in the resized array for existing elements only
1073 for (int idx = 0; idx < min_len; idx++) {
1074 int offset = operand_offset_at(idx); // offset in original array
1075 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1076 }
1077 // Copy the bootstrap specifiers only
1078 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1079 new_ops->adr_at(2*new_len),
1080 (min_size - 2*min_len) * sizeof(u2));
1081 // Explicitly deallocate old operands array.
1082 // Note, it is not needed for 7u backport.
1083 if ( operands() != NULL) { // the safety check
1084 MetadataFactory::free_array<u2>(loader_data, operands());
1085 }
1086 set_operands(new_ops);
1087 } // end resize_operands()
1088
1089
1090 // Extend the operands array with the length and size of the ext_cp operands.
1091 // Used in RedefineClasses for CP merge.
1092 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1093 int delta_len = operand_array_length(ext_cp->operands());
1094 if (delta_len == 0) {
1095 return; // nothing to do
1096 }
1097 int delta_size = ext_cp->operands()->length();
1098
1099 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1100
1101 if (operand_array_length(operands()) == 0) {
1102 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1103 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1104 // The first element index defines the offset of second part
1105 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1106 set_operands(new_ops);
1107 } else {
1108 resize_operands(delta_len, delta_size, CHECK);
1109 }
1110
1111 } // end extend_operands()
1112
1113
1114 // Shrink the operands array to a smaller array with new_len length.
1115 // Used in RedefineClasses for CP merge.
1116 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1117 int old_len = operand_array_length(operands());
1118 if (new_len == old_len) {
1119 return; // nothing to do
1120 }
1121 assert(new_len < old_len, "shrunken operands array must be smaller");
1122
1123 int free_base = operand_next_offset_at(new_len - 1);
1124 int delta_len = new_len - old_len;
1125 int delta_size = 2*delta_len + free_base - operands()->length();
1126
1127 resize_operands(delta_len, delta_size, CHECK);
1128
1129 } // end shrink_operands()
1130
1131
1132 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1133 const constantPoolHandle& to_cp,
1134 TRAPS) {
1135
1136 int from_oplen = operand_array_length(from_cp->operands());
1137 int old_oplen = operand_array_length(to_cp->operands());
1138 if (from_oplen != 0) {
1139 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1140 // append my operands to the target's operands array
1141 if (old_oplen == 0) {
1142 // Can't just reuse from_cp's operand list because of deallocation issues
1143 int len = from_cp->operands()->length();
1144 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1145 Copy::conjoint_memory_atomic(
1146 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1147 to_cp->set_operands(new_ops);
1148 } else {
1149 int old_len = to_cp->operands()->length();
1150 int from_len = from_cp->operands()->length();
1151 int old_off = old_oplen * sizeof(u2);
1152 int from_off = from_oplen * sizeof(u2);
1153 // Use the metaspace for the destination constant pool
1154 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1155 int fillp = 0, len = 0;
1156 // first part of dest
1157 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1158 new_operands->adr_at(fillp),
1159 (len = old_off) * sizeof(u2));
1160 fillp += len;
1161 // first part of src
1162 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1163 new_operands->adr_at(fillp),
1164 (len = from_off) * sizeof(u2));
1165 fillp += len;
1166 // second part of dest
1167 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1168 new_operands->adr_at(fillp),
1169 (len = old_len - old_off) * sizeof(u2));
1170 fillp += len;
1171 // second part of src
1172 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1173 new_operands->adr_at(fillp),
1174 (len = from_len - from_off) * sizeof(u2));
1175 fillp += len;
1176 assert(fillp == new_operands->length(), "");
1177
1178 // Adjust indexes in the first part of the copied operands array.
1179 for (int j = 0; j < from_oplen; j++) {
1180 int offset = operand_offset_at(new_operands, old_oplen + j);
1181 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1182 offset += old_len; // every new tuple is preceded by old_len extra u2's
1183 operand_offset_at_put(new_operands, old_oplen + j, offset);
1184 }
1185
1186 // replace target operands array with combined array
1187 to_cp->set_operands(new_operands);
1188 }
1189 }
1190 } // end copy_operands()
1191
1192
1193 // Copy this constant pool's entries at start_i to end_i (inclusive)
1194 // to the constant pool to_cp's entries starting at to_i. A total of
1195 // (end_i - start_i) + 1 entries are copied.
1196 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1197 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1198
1199
1200 int dest_i = to_i; // leave original alone for debug purposes
1201
1202 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1203 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1204
1205 switch (from_cp->tag_at(src_i).value()) {
1206 case JVM_CONSTANT_Double:
1207 case JVM_CONSTANT_Long:
1208 // double and long take two constant pool entries
1209 src_i += 2;
1210 dest_i += 2;
1211 break;
1212
1213 default:
1214 // all others take one constant pool entry
1215 src_i++;
1216 dest_i++;
1217 break;
1218 }
1219 }
1220 copy_operands(from_cp, to_cp, CHECK);
1221
1222 } // end copy_cp_to_impl()
1223
1224
1225 // Copy this constant pool's entry at from_i to the constant pool
1226 // to_cp's entry at to_i.
1227 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1228 const constantPoolHandle& to_cp, int to_i,
1229 TRAPS) {
1230
1231 int tag = from_cp->tag_at(from_i).value();
1232 switch (tag) {
1233 case JVM_CONSTANT_Class:
1234 {
1235 Klass* k = from_cp->klass_at(from_i, CHECK);
1236 to_cp->klass_at_put(to_i, k);
1237 } break;
1238
1239 case JVM_CONSTANT_ClassIndex:
1240 {
1241 jint ki = from_cp->klass_index_at(from_i);
1242 to_cp->klass_index_at_put(to_i, ki);
1243 } break;
1244
1245 case JVM_CONSTANT_Double:
1246 {
1247 jdouble d = from_cp->double_at(from_i);
1248 to_cp->double_at_put(to_i, d);
1249 // double takes two constant pool entries so init second entry's tag
1250 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1251 } break;
1252
1253 case JVM_CONSTANT_Fieldref:
1254 {
1255 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1256 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1257 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1258 } break;
1259
1260 case JVM_CONSTANT_Float:
1261 {
1262 jfloat f = from_cp->float_at(from_i);
1263 to_cp->float_at_put(to_i, f);
1264 } break;
1265
1266 case JVM_CONSTANT_Integer:
1267 {
1268 jint i = from_cp->int_at(from_i);
1269 to_cp->int_at_put(to_i, i);
1270 } break;
1271
1272 case JVM_CONSTANT_InterfaceMethodref:
1273 {
1274 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1275 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1276 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1277 } break;
1278
1279 case JVM_CONSTANT_Long:
1280 {
1281 jlong l = from_cp->long_at(from_i);
1282 to_cp->long_at_put(to_i, l);
1283 // long takes two constant pool entries so init second entry's tag
1284 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1285 } break;
1286
1287 case JVM_CONSTANT_Methodref:
1288 {
1289 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1290 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1291 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1292 } break;
1293
1294 case JVM_CONSTANT_NameAndType:
1295 {
1296 int name_ref_index = from_cp->name_ref_index_at(from_i);
1297 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1298 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1299 } break;
1300
1301 case JVM_CONSTANT_StringIndex:
1302 {
1303 jint si = from_cp->string_index_at(from_i);
1304 to_cp->string_index_at_put(to_i, si);
1305 } break;
1306
1307 case JVM_CONSTANT_UnresolvedClass:
1308 case JVM_CONSTANT_UnresolvedClassInError:
1309 {
1310 // Can be resolved after checking tag, so check the slot first.
1311 CPSlot entry = from_cp->slot_at(from_i);
1312 if (entry.is_resolved()) {
1313 assert(entry.get_klass()->is_klass(), "must be");
1314 // Already resolved
1315 to_cp->klass_at_put(to_i, entry.get_klass());
1316 } else {
1317 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1318 }
1319 } break;
1320
1321 case JVM_CONSTANT_String:
1322 {
1323 Symbol* s = from_cp->unresolved_string_at(from_i);
1324 to_cp->unresolved_string_at_put(to_i, s);
1325 } break;
1326
1327 case JVM_CONSTANT_Utf8:
1328 {
1329 Symbol* s = from_cp->symbol_at(from_i);
1330 // Need to increase refcount, the old one will be thrown away and deferenced
1331 s->increment_refcount();
1332 to_cp->symbol_at_put(to_i, s);
1333 } break;
1334
1335 case JVM_CONSTANT_MethodType:
1336 case JVM_CONSTANT_MethodTypeInError:
1337 {
1338 jint k = from_cp->method_type_index_at_error_ok(from_i);
1339 to_cp->method_type_index_at_put(to_i, k);
1340 } break;
1341
1342 case JVM_CONSTANT_MethodHandle:
1343 case JVM_CONSTANT_MethodHandleInError:
1344 {
1345 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i);
1346 int k2 = from_cp->method_handle_index_at_error_ok(from_i);
1347 to_cp->method_handle_index_at_put(to_i, k1, k2);
1348 } break;
1349
1350 case JVM_CONSTANT_InvokeDynamic:
1351 {
1352 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1353 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1354 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1355 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1356 } break;
1357
1358 // Invalid is used as the tag for the second constant pool entry
1359 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1360 // not be seen by itself.
1361 case JVM_CONSTANT_Invalid: // fall through
1362
1363 default:
1364 {
1365 ShouldNotReachHere();
1366 } break;
1367 }
1368 } // end copy_entry_to()
1369
1370
1371 // Search constant pool search_cp for an entry that matches this
1372 // constant pool's entry at pattern_i. Returns the index of a
1373 // matching entry or zero (0) if there is no matching entry.
1374 int ConstantPool::find_matching_entry(int pattern_i,
1375 const constantPoolHandle& search_cp, TRAPS) {
1376
1377 // index zero (0) is not used
1378 for (int i = 1; i < search_cp->length(); i++) {
1379 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1380 if (found) {
1381 return i;
1382 }
1383 }
1384
1385 return 0; // entry not found; return unused index zero (0)
1386 } // end find_matching_entry()
1387
1388
1389 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1390 // cp2's bootstrap specifier at idx2.
1391 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1392 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1393 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1394 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1395
1396 if (!match) {
1397 return false;
1398 }
1399 int argc = operand_argument_count_at(idx1);
1400 if (argc == cp2->operand_argument_count_at(idx2)) {
1401 for (int j = 0; j < argc; j++) {
1402 k1 = operand_argument_index_at(idx1, j);
1403 k2 = cp2->operand_argument_index_at(idx2, j);
1404 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1405 if (!match) {
1406 return false;
1407 }
1408 }
1409 return true; // got through loop; all elements equal
1410 }
1411 return false;
1412 } // end compare_operand_to()
1413
1414 // Search constant pool search_cp for a bootstrap specifier that matches
1415 // this constant pool's bootstrap specifier at pattern_i index.
1416 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1417 int ConstantPool::find_matching_operand(int pattern_i,
1418 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1419 for (int i = 0; i < search_len; i++) {
1420 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1421 if (found) {
1422 return i;
1423 }
1424 }
1425 return -1; // bootstrap specifier not found; return unused index (-1)
1426 } // end find_matching_operand()
1427
1428
1429 #ifndef PRODUCT
1430
1431 const char* ConstantPool::printable_name_at(int which) {
1432
1433 constantTag tag = tag_at(which);
1434
1435 if (tag.is_string()) {
1436 return string_at_noresolve(which);
1437 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1438 return klass_name_at(which)->as_C_string();
1439 } else if (tag.is_symbol()) {
1440 return symbol_at(which)->as_C_string();
1441 }
1442 return "";
1443 }
1444
1445 #endif // PRODUCT
1446
1447
1448 // JVMTI GetConstantPool support
1449
1450 // For debugging of constant pool
1451 const bool debug_cpool = false;
1452
1453 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1454
1455 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1456 const char* WARN_MSG = "Must not be such entry!";
1457 jint size = 0;
1458 u2 idx1, idx2;
1459
1460 for (jint idx = 1; idx < cnt; idx++) {
1461 jint ent_size = 0;
1462 u1 tag = *bytes++;
1463 size++; // count tag
1464
1465 printf("const #%03d, tag: %02d ", idx, tag);
1466 switch(tag) {
1467 case JVM_CONSTANT_Invalid: {
1468 printf("Invalid");
1469 break;
1470 }
1471 case JVM_CONSTANT_Unicode: {
1472 printf("Unicode %s", WARN_MSG);
1473 break;
1474 }
1475 case JVM_CONSTANT_Utf8: {
1476 u2 len = Bytes::get_Java_u2(bytes);
1477 char str[128];
1478 if (len > 127) {
1479 len = 127;
1480 }
1481 strncpy(str, (char *) (bytes+2), len);
1482 str[len] = '\0';
1483 printf("Utf8 \"%s\"", str);
1484 ent_size = 2 + len;
1485 break;
1486 }
1487 case JVM_CONSTANT_Integer: {
1488 u4 val = Bytes::get_Java_u4(bytes);
1489 printf("int %d", *(int *) &val);
1490 ent_size = 4;
1491 break;
1492 }
1493 case JVM_CONSTANT_Float: {
1494 u4 val = Bytes::get_Java_u4(bytes);
1495 printf("float %5.3ff", *(float *) &val);
1496 ent_size = 4;
1497 break;
1498 }
1499 case JVM_CONSTANT_Long: {
1500 u8 val = Bytes::get_Java_u8(bytes);
1501 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1502 ent_size = 8;
1503 idx++; // Long takes two cpool slots
1504 break;
1505 }
1506 case JVM_CONSTANT_Double: {
1507 u8 val = Bytes::get_Java_u8(bytes);
1508 printf("double %5.3fd", *(jdouble *)&val);
1509 ent_size = 8;
1510 idx++; // Double takes two cpool slots
1511 break;
1512 }
1513 case JVM_CONSTANT_Class: {
1514 idx1 = Bytes::get_Java_u2(bytes);
1515 printf("class #%03d", idx1);
1516 ent_size = 2;
1517 break;
1518 }
1519 case JVM_CONSTANT_String: {
1520 idx1 = Bytes::get_Java_u2(bytes);
1521 printf("String #%03d", idx1);
1522 ent_size = 2;
1523 break;
1524 }
1525 case JVM_CONSTANT_Fieldref: {
1526 idx1 = Bytes::get_Java_u2(bytes);
1527 idx2 = Bytes::get_Java_u2(bytes+2);
1528 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1529 ent_size = 4;
1530 break;
1531 }
1532 case JVM_CONSTANT_Methodref: {
1533 idx1 = Bytes::get_Java_u2(bytes);
1534 idx2 = Bytes::get_Java_u2(bytes+2);
1535 printf("Method #%03d, #%03d", idx1, idx2);
1536 ent_size = 4;
1537 break;
1538 }
1539 case JVM_CONSTANT_InterfaceMethodref: {
1540 idx1 = Bytes::get_Java_u2(bytes);
1541 idx2 = Bytes::get_Java_u2(bytes+2);
1542 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1543 ent_size = 4;
1544 break;
1545 }
1546 case JVM_CONSTANT_NameAndType: {
1547 idx1 = Bytes::get_Java_u2(bytes);
1548 idx2 = Bytes::get_Java_u2(bytes+2);
1549 printf("NameAndType #%03d, #%03d", idx1, idx2);
1550 ent_size = 4;
1551 break;
1552 }
1553 case JVM_CONSTANT_ClassIndex: {
1554 printf("ClassIndex %s", WARN_MSG);
1555 break;
1556 }
1557 case JVM_CONSTANT_UnresolvedClass: {
1558 printf("UnresolvedClass: %s", WARN_MSG);
1559 break;
1560 }
1561 case JVM_CONSTANT_UnresolvedClassInError: {
1562 printf("UnresolvedClassInErr: %s", WARN_MSG);
1563 break;
1564 }
1565 case JVM_CONSTANT_StringIndex: {
1566 printf("StringIndex: %s", WARN_MSG);
1567 break;
1568 }
1569 }
1570 printf(";\n");
1571 bytes += ent_size;
1572 size += ent_size;
1573 }
1574 printf("Cpool size: %d\n", size);
1575 fflush(0);
1576 return;
1577 } /* end print_cpool_bytes */
1578
1579
1580 // Returns size of constant pool entry.
1581 jint ConstantPool::cpool_entry_size(jint idx) {
1582 switch(tag_at(idx).value()) {
1583 case JVM_CONSTANT_Invalid:
1584 case JVM_CONSTANT_Unicode:
1585 return 1;
1586
1587 case JVM_CONSTANT_Utf8:
1588 return 3 + symbol_at(idx)->utf8_length();
1589
1590 case JVM_CONSTANT_Class:
1591 case JVM_CONSTANT_String:
1592 case JVM_CONSTANT_ClassIndex:
1593 case JVM_CONSTANT_UnresolvedClass:
1594 case JVM_CONSTANT_UnresolvedClassInError:
1595 case JVM_CONSTANT_StringIndex:
1596 case JVM_CONSTANT_MethodType:
1597 case JVM_CONSTANT_MethodTypeInError:
1598 return 3;
1599
1600 case JVM_CONSTANT_MethodHandle:
1601 case JVM_CONSTANT_MethodHandleInError:
1602 return 4; //tag, ref_kind, ref_index
1603
1604 case JVM_CONSTANT_Integer:
1605 case JVM_CONSTANT_Float:
1606 case JVM_CONSTANT_Fieldref:
1607 case JVM_CONSTANT_Methodref:
1608 case JVM_CONSTANT_InterfaceMethodref:
1609 case JVM_CONSTANT_NameAndType:
1610 return 5;
1611
1612 case JVM_CONSTANT_InvokeDynamic:
1613 // u1 tag, u2 bsm, u2 nt
1614 return 5;
1615
1616 case JVM_CONSTANT_Long:
1617 case JVM_CONSTANT_Double:
1618 return 9;
1619 }
1620 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1621 return 1;
1622 } /* end cpool_entry_size */
1623
1624
1625 // SymbolHashMap is used to find a constant pool index from a string.
1626 // This function fills in SymbolHashMaps, one for utf8s and one for
1627 // class names, returns size of the cpool raw bytes.
1628 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1629 SymbolHashMap *classmap) {
1630 jint size = 0;
1631
1632 for (u2 idx = 1; idx < length(); idx++) {
1633 u2 tag = tag_at(idx).value();
1634 size += cpool_entry_size(idx);
1635
1636 switch(tag) {
1637 case JVM_CONSTANT_Utf8: {
1638 Symbol* sym = symbol_at(idx);
1639 symmap->add_entry(sym, idx);
1640 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1641 break;
1642 }
1643 case JVM_CONSTANT_Class:
1644 case JVM_CONSTANT_UnresolvedClass:
1645 case JVM_CONSTANT_UnresolvedClassInError: {
1646 Symbol* sym = klass_name_at(idx);
1647 classmap->add_entry(sym, idx);
1648 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1649 break;
1650 }
1651 case JVM_CONSTANT_Long:
1652 case JVM_CONSTANT_Double: {
1653 idx++; // Both Long and Double take two cpool slots
1654 break;
1655 }
1656 }
1657 }
1658 return size;
1659 } /* end hash_utf8_entries_to */
1660
1661
1662 // Copy cpool bytes.
1663 // Returns:
1664 // 0, in case of OutOfMemoryError
1665 // -1, in case of internal error
1666 // > 0, count of the raw cpool bytes that have been copied
1667 int ConstantPool::copy_cpool_bytes(int cpool_size,
1668 SymbolHashMap* tbl,
1669 unsigned char *bytes) {
1670 u2 idx1, idx2;
1671 jint size = 0;
1672 jint cnt = length();
1673 unsigned char *start_bytes = bytes;
1674
1675 for (jint idx = 1; idx < cnt; idx++) {
1676 u1 tag = tag_at(idx).value();
1677 jint ent_size = cpool_entry_size(idx);
1678
1679 assert(size + ent_size <= cpool_size, "Size mismatch");
1680
1681 *bytes = tag;
1682 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1683 switch(tag) {
1684 case JVM_CONSTANT_Invalid: {
1685 DBG(printf("JVM_CONSTANT_Invalid"));
1686 break;
1687 }
1688 case JVM_CONSTANT_Unicode: {
1689 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1690 DBG(printf("JVM_CONSTANT_Unicode"));
1691 break;
1692 }
1693 case JVM_CONSTANT_Utf8: {
1694 Symbol* sym = symbol_at(idx);
1695 char* str = sym->as_utf8();
1696 // Warning! It's crashing on x86 with len = sym->utf8_length()
1697 int len = (int) strlen(str);
1698 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1699 for (int i = 0; i < len; i++) {
1700 bytes[3+i] = (u1) str[i];
1701 }
1702 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1703 break;
1704 }
1705 case JVM_CONSTANT_Integer: {
1706 jint val = int_at(idx);
1707 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1708 break;
1709 }
1710 case JVM_CONSTANT_Float: {
1711 jfloat val = float_at(idx);
1712 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1713 break;
1714 }
1715 case JVM_CONSTANT_Long: {
1716 jlong val = long_at(idx);
1717 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1718 idx++; // Long takes two cpool slots
1719 break;
1720 }
1721 case JVM_CONSTANT_Double: {
1722 jdouble val = double_at(idx);
1723 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1724 idx++; // Double takes two cpool slots
1725 break;
1726 }
1727 case JVM_CONSTANT_Class:
1728 case JVM_CONSTANT_UnresolvedClass:
1729 case JVM_CONSTANT_UnresolvedClassInError: {
1730 *bytes = JVM_CONSTANT_Class;
1731 Symbol* sym = klass_name_at(idx);
1732 idx1 = tbl->symbol_to_value(sym);
1733 assert(idx1 != 0, "Have not found a hashtable entry");
1734 Bytes::put_Java_u2((address) (bytes+1), idx1);
1735 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1736 break;
1737 }
1738 case JVM_CONSTANT_String: {
1739 *bytes = JVM_CONSTANT_String;
1740 Symbol* sym = unresolved_string_at(idx);
1741 idx1 = tbl->symbol_to_value(sym);
1742 assert(idx1 != 0, "Have not found a hashtable entry");
1743 Bytes::put_Java_u2((address) (bytes+1), idx1);
1744 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1745 break;
1746 }
1747 case JVM_CONSTANT_Fieldref:
1748 case JVM_CONSTANT_Methodref:
1749 case JVM_CONSTANT_InterfaceMethodref: {
1750 idx1 = uncached_klass_ref_index_at(idx);
1751 idx2 = uncached_name_and_type_ref_index_at(idx);
1752 Bytes::put_Java_u2((address) (bytes+1), idx1);
1753 Bytes::put_Java_u2((address) (bytes+3), idx2);
1754 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1755 break;
1756 }
1757 case JVM_CONSTANT_NameAndType: {
1758 idx1 = name_ref_index_at(idx);
1759 idx2 = signature_ref_index_at(idx);
1760 Bytes::put_Java_u2((address) (bytes+1), idx1);
1761 Bytes::put_Java_u2((address) (bytes+3), idx2);
1762 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1763 break;
1764 }
1765 case JVM_CONSTANT_ClassIndex: {
1766 *bytes = JVM_CONSTANT_Class;
1767 idx1 = klass_index_at(idx);
1768 Bytes::put_Java_u2((address) (bytes+1), idx1);
1769 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1770 break;
1771 }
1772 case JVM_CONSTANT_StringIndex: {
1773 *bytes = JVM_CONSTANT_String;
1774 idx1 = string_index_at(idx);
1775 Bytes::put_Java_u2((address) (bytes+1), idx1);
1776 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1777 break;
1778 }
1779 case JVM_CONSTANT_MethodHandle:
1780 case JVM_CONSTANT_MethodHandleInError: {
1781 *bytes = JVM_CONSTANT_MethodHandle;
1782 int kind = method_handle_ref_kind_at_error_ok(idx);
1783 idx1 = method_handle_index_at_error_ok(idx);
1784 *(bytes+1) = (unsigned char) kind;
1785 Bytes::put_Java_u2((address) (bytes+2), idx1);
1786 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1787 break;
1788 }
1789 case JVM_CONSTANT_MethodType:
1790 case JVM_CONSTANT_MethodTypeInError: {
1791 *bytes = JVM_CONSTANT_MethodType;
1792 idx1 = method_type_index_at_error_ok(idx);
1793 Bytes::put_Java_u2((address) (bytes+1), idx1);
1794 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1795 break;
1796 }
1797 case JVM_CONSTANT_InvokeDynamic: {
1798 *bytes = tag;
1799 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1800 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1801 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1802 Bytes::put_Java_u2((address) (bytes+1), idx1);
1803 Bytes::put_Java_u2((address) (bytes+3), idx2);
1804 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1805 break;
1806 }
1807 }
1808 DBG(printf("\n"));
1809 bytes += ent_size;
1810 size += ent_size;
1811 }
1812 assert(size == cpool_size, "Size mismatch");
1813
1814 // Keep temorarily for debugging until it's stable.
1815 DBG(print_cpool_bytes(cnt, start_bytes));
1816 return (int)(bytes - start_bytes);
1817 } /* end copy_cpool_bytes */
1818
1819 #undef DBG
1820
1821
1822 void ConstantPool::set_on_stack(const bool value) {
1823 if (value) {
1824 // Only record if it's not already set.
1825 if (!on_stack()) {
1826 _flags |= _on_stack;
1827 MetadataOnStackMark::record(this);
1828 }
1829 } else {
1830 // Clearing is done single-threadedly.
1831 _flags &= ~_on_stack;
1832 }
1833 }
1834
1835 // JSR 292 support for patching constant pool oops after the class is linked and
1836 // the oop array for resolved references are created.
1837 // We can't do this during classfile parsing, which is how the other indexes are
1838 // patched. The other patches are applied early for some error checking
1839 // so only defer the pseudo_strings.
1840 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
1841 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1842 Handle patch = cp_patches->at(index);
1843 if (patch.not_null()) {
1844 assert (tag_at(index).is_string(), "should only be string left");
1845 // Patching a string means pre-resolving it.
1846 // The spelling in the constant pool is ignored.
1847 // The constant reference may be any object whatever.
1848 // If it is not a real interned string, the constant is referred
1849 // to as a "pseudo-string", and must be presented to the CP
1850 // explicitly, because it may require scavenging.
1851 int obj_index = cp_to_object_index(index);
1852 pseudo_string_at_put(index, obj_index, patch());
1853 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1854 }
1855 }
1856 #ifdef ASSERT
1857 // Ensure that all the patches have been used.
1858 for (int index = 0; index < cp_patches->length(); index++) {
1859 assert(cp_patches->at(index).is_null(),
1860 "Unused constant pool patch at %d in class file %s",
1861 index,
1862 pool_holder()->external_name());
1863 }
1864 #endif // ASSERT
1865 }
1866
1867 #ifndef PRODUCT
1868
1869 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1870 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1871 guarantee(obj->is_constantPool(), "object must be constant pool");
1872 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1873 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1874
1875 for (int i = 0; i< cp->length(); i++) {
1876 if (cp->tag_at(i).is_unresolved_klass()) {
1877 // This will force loading of the class
1878 Klass* klass = cp->klass_at(i, CHECK);
1879 if (klass->is_instance_klass()) {
1880 // Force initialization of class
1881 InstanceKlass::cast(klass)->initialize(CHECK);
1882 }
1883 }
1884 }
1885 }
1886
1887 #endif
1888
1889
1890 // Printing
1891
1892 void ConstantPool::print_on(outputStream* st) const {
1893 assert(is_constantPool(), "must be constantPool");
1894 st->print_cr("%s", internal_name());
1895 if (flags() != 0) {
1896 st->print(" - flags: 0x%x", flags());
1897 if (has_preresolution()) st->print(" has_preresolution");
1898 if (on_stack()) st->print(" on_stack");
1899 st->cr();
1900 }
1901 if (pool_holder() != NULL) {
1902 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
1903 }
1904 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
1905 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
1906 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
1907
1908 for (int index = 1; index < length(); index++) { // Index 0 is unused
1909 ((ConstantPool*)this)->print_entry_on(index, st);
1910 switch (tag_at(index).value()) {
1911 case JVM_CONSTANT_Long :
1912 case JVM_CONSTANT_Double :
1913 index++; // Skip entry following eigth-byte constant
1914 }
1915
1916 }
1917 st->cr();
1918 }
1919
1920 // Print one constant pool entry
1921 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1922 EXCEPTION_MARK;
1923 st->print(" - %3d : ", index);
1924 tag_at(index).print_on(st);
1925 st->print(" : ");
1926 switch (tag_at(index).value()) {
1927 case JVM_CONSTANT_Class :
1928 { Klass* k = klass_at(index, CATCH);
1929 guarantee(k != NULL, "need klass");
1930 k->print_value_on(st);
1931 st->print(" {" PTR_FORMAT "}", p2i(k));
1932 }
1933 break;
1934 case JVM_CONSTANT_Fieldref :
1935 case JVM_CONSTANT_Methodref :
1936 case JVM_CONSTANT_InterfaceMethodref :
1937 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1938 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1939 break;
1940 case JVM_CONSTANT_String :
1941 if (is_pseudo_string_at(index)) {
1942 oop anObj = pseudo_string_at(index);
1943 anObj->print_value_on(st);
1944 st->print(" {" PTR_FORMAT "}", p2i(anObj));
1945 } else {
1946 unresolved_string_at(index)->print_value_on(st);
1947 }
1948 break;
1949 case JVM_CONSTANT_Integer :
1950 st->print("%d", int_at(index));
1951 break;
1952 case JVM_CONSTANT_Float :
1953 st->print("%f", float_at(index));
1954 break;
1955 case JVM_CONSTANT_Long :
1956 st->print_jlong(long_at(index));
1957 break;
1958 case JVM_CONSTANT_Double :
1959 st->print("%lf", double_at(index));
1960 break;
1961 case JVM_CONSTANT_NameAndType :
1962 st->print("name_index=%d", name_ref_index_at(index));
1963 st->print(" signature_index=%d", signature_ref_index_at(index));
1964 break;
1965 case JVM_CONSTANT_Utf8 :
1966 symbol_at(index)->print_value_on(st);
1967 break;
1968 case JVM_CONSTANT_UnresolvedClass : // fall-through
1969 case JVM_CONSTANT_UnresolvedClassInError: {
1970 CPSlot entry = slot_at(index);
1971 if (entry.is_resolved()) {
1972 entry.get_klass()->print_value_on(st);
1973 } else {
1974 entry.get_symbol()->print_value_on(st);
1975 }
1976 }
1977 break;
1978 case JVM_CONSTANT_MethodHandle :
1979 case JVM_CONSTANT_MethodHandleInError :
1980 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index));
1981 st->print(" ref_index=%d", method_handle_index_at_error_ok(index));
1982 break;
1983 case JVM_CONSTANT_MethodType :
1984 case JVM_CONSTANT_MethodTypeInError :
1985 st->print("signature_index=%d", method_type_index_at_error_ok(index));
1986 break;
1987 case JVM_CONSTANT_InvokeDynamic :
1988 {
1989 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1990 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1991 int argc = invoke_dynamic_argument_count_at(index);
1992 if (argc > 0) {
1993 for (int arg_i = 0; arg_i < argc; arg_i++) {
1994 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1995 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1996 }
1997 st->print("}");
1998 }
1999 }
2000 break;
2001 default:
2002 ShouldNotReachHere();
2003 break;
2004 }
2005 st->cr();
2006 }
2007
2008 void ConstantPool::print_value_on(outputStream* st) const {
2009 assert(is_constantPool(), "must be constantPool");
2010 st->print("constant pool [%d]", length());
2011 if (has_preresolution()) st->print("/preresolution");
2012 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2013 print_address_on(st);
2014 st->print(" for ");
2015 pool_holder()->print_value_on(st);
2016 if (pool_holder() != NULL) {
2017 bool extra = (pool_holder()->constants() != this);
2018 if (extra) st->print(" (extra)");
2019 }
2020 if (cache() != NULL) {
2021 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2022 }
2023 }
2024
2025 #if INCLUDE_SERVICES
2026 // Size Statistics
2027 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2028 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2029 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2030 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2031 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2032 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2033
2034 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2035 sz->_cp_refmap_bytes;
2036 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2037 }
2038 #endif // INCLUDE_SERVICES
2039
2040 // Verification
2041
2042 void ConstantPool::verify_on(outputStream* st) {
2043 guarantee(is_constantPool(), "object must be constant pool");
2044 for (int i = 0; i< length(); i++) {
2045 constantTag tag = tag_at(i);
2046 CPSlot entry = slot_at(i);
2047 if (tag.is_klass()) {
2048 if (entry.is_resolved()) {
2049 guarantee(entry.get_klass()->is_klass(), "should be klass");
2050 }
2051 } else if (tag.is_unresolved_klass()) {
2052 if (entry.is_resolved()) {
2053 guarantee(entry.get_klass()->is_klass(), "should be klass");
2054 }
2055 } else if (tag.is_symbol()) {
2056 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2057 } else if (tag.is_string()) {
2058 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2059 }
2060 }
2061 if (cache() != NULL) {
2062 // Note: cache() can be NULL before a class is completely setup or
2063 // in temporary constant pools used during constant pool merging
2064 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2065 }
2066 if (pool_holder() != NULL) {
2067 // Note: pool_holder() can be NULL in temporary constant pools
2068 // used during constant pool merging
2069 guarantee(pool_holder()->is_klass(), "should be klass");
2070 }
2071 }
2072
2073
2074 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2075 char *str = sym->as_utf8();
2076 unsigned int hash = compute_hash(str, sym->utf8_length());
2077 unsigned int index = hash % table_size();
2078
2079 // check if already in map
2080 // we prefer the first entry since it is more likely to be what was used in
2081 // the class file
2082 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2083 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2084 if (en->hash() == hash && en->symbol() == sym) {
2085 return; // already there
2086 }
2087 }
2088
2089 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2090 entry->set_next(bucket(index));
2091 _buckets[index].set_entry(entry);
2092 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2093 }
2094
2095 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2096 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2097 char *str = sym->as_utf8();
2098 int len = sym->utf8_length();
2099 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2100 unsigned int index = hash % table_size();
2101 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2102 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2103 if (en->hash() == hash && en->symbol() == sym) {
2104 return en;
2105 }
2106 }
2107 return NULL;
2108 }