Wed, 22 Jan 2014 17:42:23 -0800
Merge
1 /*
2 * Copyright (c) 1997, 2013, 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 */
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/metadataOnStackMark.hpp"
29 #include "classfile/symbolTable.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 "runtime/fieldType.hpp"
40 #include "runtime/init.hpp"
41 #include "runtime/javaCalls.hpp"
42 #include "runtime/signature.hpp"
43 #include "runtime/vframe.hpp"
45 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
46 // Tags are RW but comment below applies to tags also.
47 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
49 int size = ConstantPool::size(length);
51 // CDS considerations:
52 // Allocate read-write but may be able to move to read-only at dumping time
53 // if all the klasses are resolved. The only other field that is writable is
54 // the resolved_references array, which is recreated at startup time.
55 // But that could be moved to InstanceKlass (although a pain to access from
56 // assembly code). Maybe it could be moved to the cpCache which is RW.
57 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
58 }
60 ConstantPool::ConstantPool(Array<u1>* tags) {
61 set_length(tags->length());
62 set_tags(NULL);
63 set_cache(NULL);
64 set_reference_map(NULL);
65 set_resolved_references(NULL);
66 set_operands(NULL);
67 set_pool_holder(NULL);
68 set_flags(0);
70 // only set to non-zero if constant pool is merged by RedefineClasses
71 set_version(0);
72 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
74 // initialize tag array
75 int length = tags->length();
76 for (int index = 0; index < length; index++) {
77 tags->at_put(index, JVM_CONSTANT_Invalid);
78 }
79 set_tags(tags);
80 }
82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
83 MetadataFactory::free_metadata(loader_data, cache());
84 set_cache(NULL);
85 MetadataFactory::free_array<jushort>(loader_data, operands());
86 set_operands(NULL);
88 release_C_heap_structures();
90 // free tag array
91 MetadataFactory::free_array<u1>(loader_data, tags());
92 set_tags(NULL);
93 }
95 void ConstantPool::release_C_heap_structures() {
96 // walk constant pool and decrement symbol reference counts
97 unreference_symbols();
99 delete _lock;
100 set_lock(NULL);
101 }
103 objArrayOop ConstantPool::resolved_references() const {
104 return (objArrayOop)JNIHandles::resolve(_resolved_references);
105 }
107 // Create resolved_references array and mapping array for original cp indexes
108 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
109 // to map it back for resolving and some unlikely miscellaneous uses.
110 // The objects created by invokedynamic are appended to this list.
111 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
112 intStack reference_map,
113 int constant_pool_map_length,
114 TRAPS) {
115 // Initialized the resolved object cache.
116 int map_length = reference_map.length();
117 if (map_length > 0) {
118 // Only need mapping back to constant pool entries. The map isn't used for
119 // invokedynamic resolved_reference entries. For invokedynamic entries,
120 // the constant pool cache index has the mapping back to both the constant
121 // pool and to the resolved reference index.
122 if (constant_pool_map_length > 0) {
123 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
125 for (int i = 0; i < constant_pool_map_length; i++) {
126 int x = reference_map.at(i);
127 assert(x == (int)(jushort) x, "klass index is too big");
128 om->at_put(i, (jushort)x);
129 }
130 set_reference_map(om);
131 }
133 // Create Java array for holding resolved strings, methodHandles,
134 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
135 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
136 Handle refs_handle (THREAD, (oop)stom); // must handleize.
137 set_resolved_references(loader_data->add_handle(refs_handle));
138 }
139 }
141 // CDS support. Create a new resolved_references array.
142 void ConstantPool::restore_unshareable_info(TRAPS) {
144 // restore the C++ vtable from the shared archive
145 restore_vtable();
147 if (SystemDictionary::Object_klass_loaded()) {
148 // Recreate the object array and add to ClassLoaderData.
149 int map_length = resolved_reference_length();
150 if (map_length > 0) {
151 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
152 Handle refs_handle (THREAD, (oop)stom); // must handleize.
154 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
155 set_resolved_references(loader_data->add_handle(refs_handle));
156 }
158 // Also need to recreate the mutex. Make sure this matches the constructor
159 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
160 }
161 }
163 void ConstantPool::remove_unshareable_info() {
164 // Resolved references are not in the shared archive.
165 // Save the length for restoration. It is not necessarily the same length
166 // as reference_map.length() if invokedynamic is saved.
167 set_resolved_reference_length(
168 resolved_references() != NULL ? resolved_references()->length() : 0);
169 set_resolved_references(NULL);
170 set_lock(NULL);
171 }
173 int ConstantPool::cp_to_object_index(int cp_index) {
174 // this is harder don't do this so much.
175 int i = reference_map()->find(cp_index);
176 // We might not find the index for jsr292 call.
177 return (i < 0) ? _no_index_sentinel : i;
178 }
180 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
181 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
182 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
183 // tag is not updated atomicly.
185 CPSlot entry = this_oop->slot_at(which);
186 if (entry.is_resolved()) {
187 assert(entry.get_klass()->is_klass(), "must be");
188 // Already resolved - return entry.
189 return entry.get_klass();
190 }
192 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
193 // already has updated the object
194 assert(THREAD->is_Java_thread(), "must be a Java thread");
195 bool do_resolve = false;
196 bool in_error = false;
198 // Create a handle for the mirror. This will preserve the resolved class
199 // until the loader_data is registered.
200 Handle mirror_handle;
202 Symbol* name = NULL;
203 Handle loader;
204 { MonitorLockerEx ml(this_oop->lock());
206 if (this_oop->tag_at(which).is_unresolved_klass()) {
207 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
208 in_error = true;
209 } else {
210 do_resolve = true;
211 name = this_oop->unresolved_klass_at(which);
212 loader = Handle(THREAD, this_oop->pool_holder()->class_loader());
213 }
214 }
215 } // unlocking constantPool
218 // The original attempt to resolve this constant pool entry failed so find the
219 // original error and throw it again (JVMS 5.4.3).
220 if (in_error) {
221 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
222 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
223 ResourceMark rm;
224 // exception text will be the class name
225 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
226 THROW_MSG_0(error, className);
227 }
229 if (do_resolve) {
230 // this_oop must be unlocked during resolve_or_fail
231 oop protection_domain = this_oop->pool_holder()->protection_domain();
232 Handle h_prot (THREAD, protection_domain);
233 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
234 KlassHandle k;
235 if (!HAS_PENDING_EXCEPTION) {
236 k = KlassHandle(THREAD, k_oop);
237 // preserve the resolved klass.
238 mirror_handle = Handle(THREAD, k_oop->java_mirror());
239 // Do access check for klasses
240 verify_constant_pool_resolve(this_oop, k, THREAD);
241 }
243 // Failed to resolve class. We must record the errors so that subsequent attempts
244 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
245 if (HAS_PENDING_EXCEPTION) {
246 ResourceMark rm;
247 Symbol* error = PENDING_EXCEPTION->klass()->name();
249 bool throw_orig_error = false;
250 {
251 MonitorLockerEx ml(this_oop->lock());
253 // some other thread has beaten us and has resolved the class.
254 if (this_oop->tag_at(which).is_klass()) {
255 CLEAR_PENDING_EXCEPTION;
256 entry = this_oop->resolved_klass_at(which);
257 return entry.get_klass();
258 }
260 if (!PENDING_EXCEPTION->
261 is_a(SystemDictionary::LinkageError_klass())) {
262 // Just throw the exception and don't prevent these classes from
263 // being loaded due to virtual machine errors like StackOverflow
264 // and OutOfMemoryError, etc, or if the thread was hit by stop()
265 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
266 }
267 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
268 SystemDictionary::add_resolution_error(this_oop, which, error);
269 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
270 } else {
271 // some other thread has put the class in error state.
272 error = SystemDictionary::find_resolution_error(this_oop, which);
273 assert(error != NULL, "checking");
274 throw_orig_error = true;
275 }
276 } // unlocked
278 if (throw_orig_error) {
279 CLEAR_PENDING_EXCEPTION;
280 ResourceMark rm;
281 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
282 THROW_MSG_0(error, className);
283 }
285 return 0;
286 }
288 if (TraceClassResolution && !k()->oop_is_array()) {
289 // skip resolving the constant pool so that this code get's
290 // called the next time some bytecodes refer to this class.
291 ResourceMark rm;
292 int line_number = -1;
293 const char * source_file = NULL;
294 if (JavaThread::current()->has_last_Java_frame()) {
295 // try to identify the method which called this function.
296 vframeStream vfst(JavaThread::current());
297 if (!vfst.at_end()) {
298 line_number = vfst.method()->line_number_from_bci(vfst.bci());
299 Symbol* s = vfst.method()->method_holder()->source_file_name();
300 if (s != NULL) {
301 source_file = s->as_C_string();
302 }
303 }
304 }
305 if (k() != this_oop->pool_holder()) {
306 // only print something if the classes are different
307 if (source_file != NULL) {
308 tty->print("RESOLVE %s %s %s:%d\n",
309 this_oop->pool_holder()->external_name(),
310 InstanceKlass::cast(k())->external_name(), source_file, line_number);
311 } else {
312 tty->print("RESOLVE %s %s\n",
313 this_oop->pool_holder()->external_name(),
314 InstanceKlass::cast(k())->external_name());
315 }
316 }
317 return k();
318 } else {
319 MonitorLockerEx ml(this_oop->lock());
320 // Only updated constant pool - if it is resolved.
321 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
322 if (do_resolve) {
323 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data();
324 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
325 this_oop->klass_at_put(which, k());
326 }
327 }
328 }
330 entry = this_oop->resolved_klass_at(which);
331 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
332 return entry.get_klass();
333 }
336 // Does not update ConstantPool* - to avoid any exception throwing. Used
337 // by compiler and exception handling. Also used to avoid classloads for
338 // instanceof operations. Returns NULL if the class has not been loaded or
339 // if the verification of constant pool failed
340 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
341 CPSlot entry = this_oop->slot_at(which);
342 if (entry.is_resolved()) {
343 assert(entry.get_klass()->is_klass(), "must be");
344 return entry.get_klass();
345 } else {
346 assert(entry.is_unresolved(), "must be either symbol or klass");
347 Thread *thread = Thread::current();
348 Symbol* name = entry.get_symbol();
349 oop loader = this_oop->pool_holder()->class_loader();
350 oop protection_domain = this_oop->pool_holder()->protection_domain();
351 Handle h_prot (thread, protection_domain);
352 Handle h_loader (thread, loader);
353 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
355 if (k != NULL) {
356 // Make sure that resolving is legal
357 EXCEPTION_MARK;
358 KlassHandle klass(THREAD, k);
359 // return NULL if verification fails
360 verify_constant_pool_resolve(this_oop, klass, THREAD);
361 if (HAS_PENDING_EXCEPTION) {
362 CLEAR_PENDING_EXCEPTION;
363 return NULL;
364 }
365 return klass();
366 } else {
367 return k;
368 }
369 }
370 }
373 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
374 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
375 }
378 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
379 int which) {
380 if (cpool->cache() == NULL) return NULL; // nothing to load yet
381 int cache_index = decode_cpcache_index(which, true);
382 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
383 // FIXME: should be an assert
384 if (PrintMiscellaneous && (Verbose||WizardMode)) {
385 tty->print_cr("bad operand %d in:", which); cpool->print();
386 }
387 return NULL;
388 }
389 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
390 return e->method_if_resolved(cpool);
391 }
394 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
395 if (cpool->cache() == NULL) return false; // nothing to load yet
396 int cache_index = decode_cpcache_index(which, true);
397 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
398 return e->has_appendix();
399 }
401 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
402 if (cpool->cache() == NULL) return NULL; // nothing to load yet
403 int cache_index = decode_cpcache_index(which, true);
404 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
405 return e->appendix_if_resolved(cpool);
406 }
409 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) {
410 if (cpool->cache() == NULL) return false; // nothing to load yet
411 int cache_index = decode_cpcache_index(which, true);
412 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
413 return e->has_method_type();
414 }
416 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) {
417 if (cpool->cache() == NULL) return NULL; // nothing to load yet
418 int cache_index = decode_cpcache_index(which, true);
419 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
420 return e->method_type_if_resolved(cpool);
421 }
424 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
425 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
426 return symbol_at(name_index);
427 }
430 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
431 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
432 return symbol_at(signature_index);
433 }
436 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
437 int i = which;
438 if (!uncached && cache() != NULL) {
439 if (ConstantPool::is_invokedynamic_index(which)) {
440 // Invokedynamic index is index into resolved_references
441 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
442 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
443 assert(tag_at(pool_index).is_name_and_type(), "");
444 return pool_index;
445 }
446 // change byte-ordering and go via cache
447 i = remap_instruction_operand_from_cache(which);
448 } else {
449 if (tag_at(which).is_invoke_dynamic()) {
450 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
451 assert(tag_at(pool_index).is_name_and_type(), "");
452 return pool_index;
453 }
454 }
455 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
456 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
457 jint ref_index = *int_at_addr(i);
458 return extract_high_short_from_int(ref_index);
459 }
462 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
463 guarantee(!ConstantPool::is_invokedynamic_index(which),
464 "an invokedynamic instruction does not have a klass");
465 int i = which;
466 if (!uncached && cache() != NULL) {
467 // change byte-ordering and go via cache
468 i = remap_instruction_operand_from_cache(which);
469 }
470 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
471 jint ref_index = *int_at_addr(i);
472 return extract_low_short_from_int(ref_index);
473 }
477 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
478 int cpc_index = operand;
479 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
480 assert((int)(u2)cpc_index == cpc_index, "clean u2");
481 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
482 return member_index;
483 }
486 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
487 if (k->oop_is_instance() || k->oop_is_objArray()) {
488 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
489 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
490 KlassHandle element (THREAD, elem_oop);
492 // The element type could be a typeArray - we only need the access check if it is
493 // an reference to another class
494 if (element->oop_is_instance()) {
495 LinkResolver::check_klass_accessability(holder, element, CHECK);
496 }
497 }
498 }
501 int ConstantPool::name_ref_index_at(int which_nt) {
502 jint ref_index = name_and_type_at(which_nt);
503 return extract_low_short_from_int(ref_index);
504 }
507 int ConstantPool::signature_ref_index_at(int which_nt) {
508 jint ref_index = name_and_type_at(which_nt);
509 return extract_high_short_from_int(ref_index);
510 }
513 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
514 return klass_at(klass_ref_index_at(which), CHECK_NULL);
515 }
518 Symbol* ConstantPool::klass_name_at(int which) {
519 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
520 "Corrupted constant pool");
521 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
522 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
523 // tag is not updated atomicly.
524 CPSlot entry = slot_at(which);
525 if (entry.is_resolved()) {
526 // Already resolved - return entry's name.
527 assert(entry.get_klass()->is_klass(), "must be");
528 return entry.get_klass()->name();
529 } else {
530 assert(entry.is_unresolved(), "must be either symbol or klass");
531 return entry.get_symbol();
532 }
533 }
535 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
536 jint ref_index = klass_ref_index_at(which);
537 return klass_at_noresolve(ref_index);
538 }
540 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
541 jint ref_index = uncached_klass_ref_index_at(which);
542 return klass_at_noresolve(ref_index);
543 }
545 char* ConstantPool::string_at_noresolve(int which) {
546 Symbol* s = unresolved_string_at(which);
547 if (s == NULL) {
548 return (char*)"<pseudo-string>";
549 } else {
550 return unresolved_string_at(which)->as_C_string();
551 }
552 }
554 BasicType ConstantPool::basic_type_for_signature_at(int which) {
555 return FieldType::basic_type(symbol_at(which));
556 }
559 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
560 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
561 if (this_oop->tag_at(index).is_string()) {
562 this_oop->string_at(index, CHECK);
563 }
564 }
565 }
567 // Resolve all the classes in the constant pool. If they are all resolved,
568 // the constant pool is read-only. Enhancement: allocate cp entries to
569 // another metaspace, and copy to read-only or read-write space if this
570 // bit is set.
571 bool ConstantPool::resolve_class_constants(TRAPS) {
572 constantPoolHandle cp(THREAD, this);
573 for (int index = 1; index < length(); index++) { // Index 0 is unused
574 if (tag_at(index).is_unresolved_klass() &&
575 klass_at_if_loaded(cp, index) == NULL) {
576 return false;
577 }
578 }
579 // set_preresolution(); or some bit for future use
580 return true;
581 }
583 // If resolution for MethodHandle or MethodType fails, save the exception
584 // in the resolution error table, so that the same exception is thrown again.
585 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
586 int tag, TRAPS) {
587 ResourceMark rm;
588 Symbol* error = PENDING_EXCEPTION->klass()->name();
589 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag.
591 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
592 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
594 if (!PENDING_EXCEPTION->
595 is_a(SystemDictionary::LinkageError_klass())) {
596 // Just throw the exception and don't prevent these classes from
597 // being loaded due to virtual machine errors like StackOverflow
598 // and OutOfMemoryError, etc, or if the thread was hit by stop()
599 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
601 } else if (this_oop->tag_at(which).value() != error_tag) {
602 SystemDictionary::add_resolution_error(this_oop, which, error);
603 this_oop->tag_at_put(which, error_tag);
604 } else {
605 // some other thread has put the class in error state.
606 error = SystemDictionary::find_resolution_error(this_oop, which);
607 assert(error != NULL, "checking");
608 CLEAR_PENDING_EXCEPTION;
609 THROW_MSG(error, "");
610 }
611 }
614 // Called to resolve constants in the constant pool and return an oop.
615 // Some constant pool entries cache their resolved oop. This is also
616 // called to create oops from constants to use in arguments for invokedynamic
617 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
618 oop result_oop = NULL;
619 Handle throw_exception;
621 if (cache_index == _possible_index_sentinel) {
622 // It is possible that this constant is one which is cached in the objects.
623 // We'll do a linear search. This should be OK because this usage is rare.
624 assert(index > 0, "valid index");
625 cache_index = this_oop->cp_to_object_index(index);
626 }
627 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
628 assert(index == _no_index_sentinel || index >= 0, "");
630 if (cache_index >= 0) {
631 result_oop = this_oop->resolved_references()->obj_at(cache_index);
632 if (result_oop != NULL) {
633 return result_oop;
634 // That was easy...
635 }
636 index = this_oop->object_to_cp_index(cache_index);
637 }
639 jvalue prim_value; // temp used only in a few cases below
641 int tag_value = this_oop->tag_at(index).value();
643 switch (tag_value) {
645 case JVM_CONSTANT_UnresolvedClass:
646 case JVM_CONSTANT_UnresolvedClassInError:
647 case JVM_CONSTANT_Class:
648 {
649 assert(cache_index == _no_index_sentinel, "should not have been set");
650 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
651 // ldc wants the java mirror.
652 result_oop = resolved->java_mirror();
653 break;
654 }
656 case JVM_CONSTANT_String:
657 assert(cache_index != _no_index_sentinel, "should have been set");
658 if (this_oop->is_pseudo_string_at(index)) {
659 result_oop = this_oop->pseudo_string_at(index, cache_index);
660 break;
661 }
662 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
663 break;
665 case JVM_CONSTANT_MethodHandleInError:
666 case JVM_CONSTANT_MethodTypeInError:
667 {
668 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
669 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
670 ResourceMark rm;
671 THROW_MSG_0(error, "");
672 break;
673 }
675 case JVM_CONSTANT_MethodHandle:
676 {
677 int ref_kind = this_oop->method_handle_ref_kind_at(index);
678 int callee_index = this_oop->method_handle_klass_index_at(index);
679 Symbol* name = this_oop->method_handle_name_ref_at(index);
680 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
681 if (PrintMiscellaneous)
682 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
683 ref_kind, index, this_oop->method_handle_index_at(index),
684 callee_index, name->as_C_string(), signature->as_C_string());
685 KlassHandle callee;
686 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
687 callee = KlassHandle(THREAD, k);
688 }
689 KlassHandle klass(THREAD, this_oop->pool_holder());
690 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
691 callee, name, signature,
692 THREAD);
693 result_oop = value();
694 if (HAS_PENDING_EXCEPTION) {
695 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
696 }
697 break;
698 }
700 case JVM_CONSTANT_MethodType:
701 {
702 Symbol* signature = this_oop->method_type_signature_at(index);
703 if (PrintMiscellaneous)
704 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
705 index, this_oop->method_type_index_at(index),
706 signature->as_C_string());
707 KlassHandle klass(THREAD, this_oop->pool_holder());
708 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
709 result_oop = value();
710 if (HAS_PENDING_EXCEPTION) {
711 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
712 }
713 break;
714 }
716 case JVM_CONSTANT_Integer:
717 assert(cache_index == _no_index_sentinel, "should not have been set");
718 prim_value.i = this_oop->int_at(index);
719 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
720 break;
722 case JVM_CONSTANT_Float:
723 assert(cache_index == _no_index_sentinel, "should not have been set");
724 prim_value.f = this_oop->float_at(index);
725 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
726 break;
728 case JVM_CONSTANT_Long:
729 assert(cache_index == _no_index_sentinel, "should not have been set");
730 prim_value.j = this_oop->long_at(index);
731 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
732 break;
734 case JVM_CONSTANT_Double:
735 assert(cache_index == _no_index_sentinel, "should not have been set");
736 prim_value.d = this_oop->double_at(index);
737 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
738 break;
740 default:
741 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
742 this_oop(), index, cache_index, tag_value) );
743 assert(false, "unexpected constant tag");
744 break;
745 }
747 if (cache_index >= 0) {
748 // Cache the oop here also.
749 Handle result_handle(THREAD, result_oop);
750 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this
751 oop result = this_oop->resolved_references()->obj_at(cache_index);
752 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
753 // The important thing here is that all threads pick up the same result.
754 // It doesn't matter which racing thread wins, as long as only one
755 // result is used by all threads, and all future queries.
756 // That result may be either a resolved constant or a failure exception.
757 if (result == NULL) {
758 this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
759 return result_handle();
760 } else {
761 // Return the winning thread's result. This can be different than
762 // result_handle() for MethodHandles.
763 return result;
764 }
765 } else {
766 return result_oop;
767 }
768 }
770 oop ConstantPool::uncached_string_at(int which, TRAPS) {
771 Symbol* sym = unresolved_string_at(which);
772 oop str = StringTable::intern(sym, CHECK_(NULL));
773 assert(java_lang_String::is_instance(str), "must be string");
774 return str;
775 }
778 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
779 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
781 Handle bsm;
782 int argc;
783 {
784 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
785 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
786 // It is accompanied by the optional arguments.
787 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
788 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
789 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
790 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
791 }
793 // Extract the optional static arguments.
794 argc = this_oop->invoke_dynamic_argument_count_at(index);
795 if (argc == 0) return bsm_oop;
797 bsm = Handle(THREAD, bsm_oop);
798 }
800 objArrayHandle info;
801 {
802 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
803 info = objArrayHandle(THREAD, info_oop);
804 }
806 info->obj_at_put(0, bsm());
807 for (int i = 0; i < argc; i++) {
808 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
809 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
810 info->obj_at_put(1+i, arg_oop);
811 }
813 return info();
814 }
816 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
817 // If the string has already been interned, this entry will be non-null
818 oop str = this_oop->resolved_references()->obj_at(obj_index);
819 if (str != NULL) return str;
820 Symbol* sym = this_oop->unresolved_string_at(which);
821 str = StringTable::intern(sym, CHECK_(NULL));
822 this_oop->string_at_put(which, obj_index, str);
823 assert(java_lang_String::is_instance(str), "must be string");
824 return str;
825 }
828 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
829 int which) {
830 // Names are interned, so we can compare Symbol*s directly
831 Symbol* cp_name = klass_name_at(which);
832 return (cp_name == k->name());
833 }
836 // Iterate over symbols and decrement ones which are Symbol*s.
837 // This is done during GC so do not need to lock constantPool unless we
838 // have per-thread safepoints.
839 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
840 // these symbols but didn't increment the reference count.
841 void ConstantPool::unreference_symbols() {
842 for (int index = 1; index < length(); index++) { // Index 0 is unused
843 constantTag tag = tag_at(index);
844 if (tag.is_symbol()) {
845 symbol_at(index)->decrement_refcount();
846 }
847 }
848 }
851 // Compare this constant pool's entry at index1 to the constant pool
852 // cp2's entry at index2.
853 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
854 int index2, TRAPS) {
856 // The error tags are equivalent to non-error tags when comparing
857 jbyte t1 = tag_at(index1).non_error_value();
858 jbyte t2 = cp2->tag_at(index2).non_error_value();
860 if (t1 != t2) {
861 // Not the same entry type so there is nothing else to check. Note
862 // that this style of checking will consider resolved/unresolved
863 // class pairs as different.
864 // From the ConstantPool* API point of view, this is correct
865 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
866 // plays out in the context of ConstantPool* merging.
867 return false;
868 }
870 switch (t1) {
871 case JVM_CONSTANT_Class:
872 {
873 Klass* k1 = klass_at(index1, CHECK_false);
874 Klass* k2 = cp2->klass_at(index2, CHECK_false);
875 if (k1 == k2) {
876 return true;
877 }
878 } break;
880 case JVM_CONSTANT_ClassIndex:
881 {
882 int recur1 = klass_index_at(index1);
883 int recur2 = cp2->klass_index_at(index2);
884 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
885 if (match) {
886 return true;
887 }
888 } break;
890 case JVM_CONSTANT_Double:
891 {
892 jdouble d1 = double_at(index1);
893 jdouble d2 = cp2->double_at(index2);
894 if (d1 == d2) {
895 return true;
896 }
897 } break;
899 case JVM_CONSTANT_Fieldref:
900 case JVM_CONSTANT_InterfaceMethodref:
901 case JVM_CONSTANT_Methodref:
902 {
903 int recur1 = uncached_klass_ref_index_at(index1);
904 int recur2 = cp2->uncached_klass_ref_index_at(index2);
905 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
906 if (match) {
907 recur1 = uncached_name_and_type_ref_index_at(index1);
908 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
909 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
910 if (match) {
911 return true;
912 }
913 }
914 } break;
916 case JVM_CONSTANT_Float:
917 {
918 jfloat f1 = float_at(index1);
919 jfloat f2 = cp2->float_at(index2);
920 if (f1 == f2) {
921 return true;
922 }
923 } break;
925 case JVM_CONSTANT_Integer:
926 {
927 jint i1 = int_at(index1);
928 jint i2 = cp2->int_at(index2);
929 if (i1 == i2) {
930 return true;
931 }
932 } break;
934 case JVM_CONSTANT_Long:
935 {
936 jlong l1 = long_at(index1);
937 jlong l2 = cp2->long_at(index2);
938 if (l1 == l2) {
939 return true;
940 }
941 } break;
943 case JVM_CONSTANT_NameAndType:
944 {
945 int recur1 = name_ref_index_at(index1);
946 int recur2 = cp2->name_ref_index_at(index2);
947 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
948 if (match) {
949 recur1 = signature_ref_index_at(index1);
950 recur2 = cp2->signature_ref_index_at(index2);
951 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
952 if (match) {
953 return true;
954 }
955 }
956 } break;
958 case JVM_CONSTANT_StringIndex:
959 {
960 int recur1 = string_index_at(index1);
961 int recur2 = cp2->string_index_at(index2);
962 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
963 if (match) {
964 return true;
965 }
966 } break;
968 case JVM_CONSTANT_UnresolvedClass:
969 {
970 Symbol* k1 = unresolved_klass_at(index1);
971 Symbol* k2 = cp2->unresolved_klass_at(index2);
972 if (k1 == k2) {
973 return true;
974 }
975 } break;
977 case JVM_CONSTANT_MethodType:
978 {
979 int k1 = method_type_index_at_error_ok(index1);
980 int k2 = cp2->method_type_index_at_error_ok(index2);
981 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
982 if (match) {
983 return true;
984 }
985 } break;
987 case JVM_CONSTANT_MethodHandle:
988 {
989 int k1 = method_handle_ref_kind_at_error_ok(index1);
990 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2);
991 if (k1 == k2) {
992 int i1 = method_handle_index_at_error_ok(index1);
993 int i2 = cp2->method_handle_index_at_error_ok(index2);
994 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
995 if (match) {
996 return true;
997 }
998 }
999 } break;
1001 case JVM_CONSTANT_InvokeDynamic:
1002 {
1003 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1004 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1005 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1006 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1007 // separate statements and variables because CHECK_false is used
1008 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1009 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1010 return (match_entry && match_operand);
1011 } break;
1013 case JVM_CONSTANT_String:
1014 {
1015 Symbol* s1 = unresolved_string_at(index1);
1016 Symbol* s2 = cp2->unresolved_string_at(index2);
1017 if (s1 == s2) {
1018 return true;
1019 }
1020 } break;
1022 case JVM_CONSTANT_Utf8:
1023 {
1024 Symbol* s1 = symbol_at(index1);
1025 Symbol* s2 = cp2->symbol_at(index2);
1026 if (s1 == s2) {
1027 return true;
1028 }
1029 } break;
1031 // Invalid is used as the tag for the second constant pool entry
1032 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1033 // not be seen by itself.
1034 case JVM_CONSTANT_Invalid: // fall through
1036 default:
1037 ShouldNotReachHere();
1038 break;
1039 }
1041 return false;
1042 } // end compare_entry_to()
1045 // Resize the operands array with delta_len and delta_size.
1046 // Used in RedefineClasses for CP merge.
1047 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1048 int old_len = operand_array_length(operands());
1049 int new_len = old_len + delta_len;
1050 int min_len = (delta_len > 0) ? old_len : new_len;
1052 int old_size = operands()->length();
1053 int new_size = old_size + delta_size;
1054 int min_size = (delta_size > 0) ? old_size : new_size;
1056 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1057 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1059 // Set index in the resized array for existing elements only
1060 for (int idx = 0; idx < min_len; idx++) {
1061 int offset = operand_offset_at(idx); // offset in original array
1062 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1063 }
1064 // Copy the bootstrap specifiers only
1065 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1066 new_ops->adr_at(2*new_len),
1067 (min_size - 2*min_len) * sizeof(u2));
1068 // Explicitly deallocate old operands array.
1069 // Note, it is not needed for 7u backport.
1070 if ( operands() != NULL) { // the safety check
1071 MetadataFactory::free_array<u2>(loader_data, operands());
1072 }
1073 set_operands(new_ops);
1074 } // end resize_operands()
1077 // Extend the operands array with the length and size of the ext_cp operands.
1078 // Used in RedefineClasses for CP merge.
1079 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) {
1080 int delta_len = operand_array_length(ext_cp->operands());
1081 if (delta_len == 0) {
1082 return; // nothing to do
1083 }
1084 int delta_size = ext_cp->operands()->length();
1086 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1088 if (operand_array_length(operands()) == 0) {
1089 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1090 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1091 // The first element index defines the offset of second part
1092 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1093 set_operands(new_ops);
1094 } else {
1095 resize_operands(delta_len, delta_size, CHECK);
1096 }
1098 } // end extend_operands()
1101 // Shrink the operands array to a smaller array with new_len length.
1102 // Used in RedefineClasses for CP merge.
1103 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1104 int old_len = operand_array_length(operands());
1105 if (new_len == old_len) {
1106 return; // nothing to do
1107 }
1108 assert(new_len < old_len, "shrunken operands array must be smaller");
1110 int free_base = operand_next_offset_at(new_len - 1);
1111 int delta_len = new_len - old_len;
1112 int delta_size = 2*delta_len + free_base - operands()->length();
1114 resize_operands(delta_len, delta_size, CHECK);
1116 } // end shrink_operands()
1119 void ConstantPool::copy_operands(constantPoolHandle from_cp,
1120 constantPoolHandle to_cp,
1121 TRAPS) {
1123 int from_oplen = operand_array_length(from_cp->operands());
1124 int old_oplen = operand_array_length(to_cp->operands());
1125 if (from_oplen != 0) {
1126 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1127 // append my operands to the target's operands array
1128 if (old_oplen == 0) {
1129 // Can't just reuse from_cp's operand list because of deallocation issues
1130 int len = from_cp->operands()->length();
1131 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1132 Copy::conjoint_memory_atomic(
1133 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1134 to_cp->set_operands(new_ops);
1135 } else {
1136 int old_len = to_cp->operands()->length();
1137 int from_len = from_cp->operands()->length();
1138 int old_off = old_oplen * sizeof(u2);
1139 int from_off = from_oplen * sizeof(u2);
1140 // Use the metaspace for the destination constant pool
1141 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1142 int fillp = 0, len = 0;
1143 // first part of dest
1144 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1145 new_operands->adr_at(fillp),
1146 (len = old_off) * sizeof(u2));
1147 fillp += len;
1148 // first part of src
1149 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1150 new_operands->adr_at(fillp),
1151 (len = from_off) * sizeof(u2));
1152 fillp += len;
1153 // second part of dest
1154 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1155 new_operands->adr_at(fillp),
1156 (len = old_len - old_off) * sizeof(u2));
1157 fillp += len;
1158 // second part of src
1159 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1160 new_operands->adr_at(fillp),
1161 (len = from_len - from_off) * sizeof(u2));
1162 fillp += len;
1163 assert(fillp == new_operands->length(), "");
1165 // Adjust indexes in the first part of the copied operands array.
1166 for (int j = 0; j < from_oplen; j++) {
1167 int offset = operand_offset_at(new_operands, old_oplen + j);
1168 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1169 offset += old_len; // every new tuple is preceded by old_len extra u2's
1170 operand_offset_at_put(new_operands, old_oplen + j, offset);
1171 }
1173 // replace target operands array with combined array
1174 to_cp->set_operands(new_operands);
1175 }
1176 }
1177 } // end copy_operands()
1180 // Copy this constant pool's entries at start_i to end_i (inclusive)
1181 // to the constant pool to_cp's entries starting at to_i. A total of
1182 // (end_i - start_i) + 1 entries are copied.
1183 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1184 constantPoolHandle to_cp, int to_i, TRAPS) {
1187 int dest_i = to_i; // leave original alone for debug purposes
1189 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1190 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1192 switch (from_cp->tag_at(src_i).value()) {
1193 case JVM_CONSTANT_Double:
1194 case JVM_CONSTANT_Long:
1195 // double and long take two constant pool entries
1196 src_i += 2;
1197 dest_i += 2;
1198 break;
1200 default:
1201 // all others take one constant pool entry
1202 src_i++;
1203 dest_i++;
1204 break;
1205 }
1206 }
1207 copy_operands(from_cp, to_cp, CHECK);
1209 } // end copy_cp_to_impl()
1212 // Copy this constant pool's entry at from_i to the constant pool
1213 // to_cp's entry at to_i.
1214 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1215 constantPoolHandle to_cp, int to_i,
1216 TRAPS) {
1218 int tag = from_cp->tag_at(from_i).value();
1219 switch (tag) {
1220 case JVM_CONSTANT_Class:
1221 {
1222 Klass* k = from_cp->klass_at(from_i, CHECK);
1223 to_cp->klass_at_put(to_i, k);
1224 } break;
1226 case JVM_CONSTANT_ClassIndex:
1227 {
1228 jint ki = from_cp->klass_index_at(from_i);
1229 to_cp->klass_index_at_put(to_i, ki);
1230 } break;
1232 case JVM_CONSTANT_Double:
1233 {
1234 jdouble d = from_cp->double_at(from_i);
1235 to_cp->double_at_put(to_i, d);
1236 // double takes two constant pool entries so init second entry's tag
1237 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1238 } break;
1240 case JVM_CONSTANT_Fieldref:
1241 {
1242 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1243 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1244 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1245 } break;
1247 case JVM_CONSTANT_Float:
1248 {
1249 jfloat f = from_cp->float_at(from_i);
1250 to_cp->float_at_put(to_i, f);
1251 } break;
1253 case JVM_CONSTANT_Integer:
1254 {
1255 jint i = from_cp->int_at(from_i);
1256 to_cp->int_at_put(to_i, i);
1257 } break;
1259 case JVM_CONSTANT_InterfaceMethodref:
1260 {
1261 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1262 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1263 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1264 } break;
1266 case JVM_CONSTANT_Long:
1267 {
1268 jlong l = from_cp->long_at(from_i);
1269 to_cp->long_at_put(to_i, l);
1270 // long takes two constant pool entries so init second entry's tag
1271 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1272 } break;
1274 case JVM_CONSTANT_Methodref:
1275 {
1276 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1277 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1278 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1279 } break;
1281 case JVM_CONSTANT_NameAndType:
1282 {
1283 int name_ref_index = from_cp->name_ref_index_at(from_i);
1284 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1285 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1286 } break;
1288 case JVM_CONSTANT_StringIndex:
1289 {
1290 jint si = from_cp->string_index_at(from_i);
1291 to_cp->string_index_at_put(to_i, si);
1292 } break;
1294 case JVM_CONSTANT_UnresolvedClass:
1295 {
1296 // Can be resolved after checking tag, so check the slot first.
1297 CPSlot entry = from_cp->slot_at(from_i);
1298 if (entry.is_resolved()) {
1299 assert(entry.get_klass()->is_klass(), "must be");
1300 // Already resolved
1301 to_cp->klass_at_put(to_i, entry.get_klass());
1302 } else {
1303 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1304 }
1305 } break;
1307 case JVM_CONSTANT_String:
1308 {
1309 Symbol* s = from_cp->unresolved_string_at(from_i);
1310 to_cp->unresolved_string_at_put(to_i, s);
1311 } break;
1313 case JVM_CONSTANT_Utf8:
1314 {
1315 Symbol* s = from_cp->symbol_at(from_i);
1316 // Need to increase refcount, the old one will be thrown away and deferenced
1317 s->increment_refcount();
1318 to_cp->symbol_at_put(to_i, s);
1319 } break;
1321 case JVM_CONSTANT_MethodType:
1322 case JVM_CONSTANT_MethodTypeInError:
1323 {
1324 jint k = from_cp->method_type_index_at_error_ok(from_i);
1325 to_cp->method_type_index_at_put(to_i, k);
1326 } break;
1328 case JVM_CONSTANT_MethodHandle:
1329 case JVM_CONSTANT_MethodHandleInError:
1330 {
1331 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i);
1332 int k2 = from_cp->method_handle_index_at_error_ok(from_i);
1333 to_cp->method_handle_index_at_put(to_i, k1, k2);
1334 } break;
1336 case JVM_CONSTANT_InvokeDynamic:
1337 {
1338 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1339 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1340 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1341 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1342 } break;
1344 // Invalid is used as the tag for the second constant pool entry
1345 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1346 // not be seen by itself.
1347 case JVM_CONSTANT_Invalid: // fall through
1349 default:
1350 {
1351 ShouldNotReachHere();
1352 } break;
1353 }
1354 } // end copy_entry_to()
1357 // Search constant pool search_cp for an entry that matches this
1358 // constant pool's entry at pattern_i. Returns the index of a
1359 // matching entry or zero (0) if there is no matching entry.
1360 int ConstantPool::find_matching_entry(int pattern_i,
1361 constantPoolHandle search_cp, TRAPS) {
1363 // index zero (0) is not used
1364 for (int i = 1; i < search_cp->length(); i++) {
1365 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1366 if (found) {
1367 return i;
1368 }
1369 }
1371 return 0; // entry not found; return unused index zero (0)
1372 } // end find_matching_entry()
1375 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1376 // cp2's bootstrap specifier at idx2.
1377 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) {
1378 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1379 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1380 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1382 if (!match) {
1383 return false;
1384 }
1385 int argc = operand_argument_count_at(idx1);
1386 if (argc == cp2->operand_argument_count_at(idx2)) {
1387 for (int j = 0; j < argc; j++) {
1388 k1 = operand_argument_index_at(idx1, j);
1389 k2 = cp2->operand_argument_index_at(idx2, j);
1390 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1391 if (!match) {
1392 return false;
1393 }
1394 }
1395 return true; // got through loop; all elements equal
1396 }
1397 return false;
1398 } // end compare_operand_to()
1400 // Search constant pool search_cp for a bootstrap specifier that matches
1401 // this constant pool's bootstrap specifier at pattern_i index.
1402 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1403 int ConstantPool::find_matching_operand(int pattern_i,
1404 constantPoolHandle search_cp, int search_len, TRAPS) {
1405 for (int i = 0; i < search_len; i++) {
1406 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1407 if (found) {
1408 return i;
1409 }
1410 }
1411 return -1; // bootstrap specifier not found; return unused index (-1)
1412 } // end find_matching_operand()
1415 #ifndef PRODUCT
1417 const char* ConstantPool::printable_name_at(int which) {
1419 constantTag tag = tag_at(which);
1421 if (tag.is_string()) {
1422 return string_at_noresolve(which);
1423 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1424 return klass_name_at(which)->as_C_string();
1425 } else if (tag.is_symbol()) {
1426 return symbol_at(which)->as_C_string();
1427 }
1428 return "";
1429 }
1431 #endif // PRODUCT
1434 // JVMTI GetConstantPool support
1436 // For debugging of constant pool
1437 const bool debug_cpool = false;
1439 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1441 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1442 const char* WARN_MSG = "Must not be such entry!";
1443 jint size = 0;
1444 u2 idx1, idx2;
1446 for (jint idx = 1; idx < cnt; idx++) {
1447 jint ent_size = 0;
1448 u1 tag = *bytes++;
1449 size++; // count tag
1451 printf("const #%03d, tag: %02d ", idx, tag);
1452 switch(tag) {
1453 case JVM_CONSTANT_Invalid: {
1454 printf("Invalid");
1455 break;
1456 }
1457 case JVM_CONSTANT_Unicode: {
1458 printf("Unicode %s", WARN_MSG);
1459 break;
1460 }
1461 case JVM_CONSTANT_Utf8: {
1462 u2 len = Bytes::get_Java_u2(bytes);
1463 char str[128];
1464 if (len > 127) {
1465 len = 127;
1466 }
1467 strncpy(str, (char *) (bytes+2), len);
1468 str[len] = '\0';
1469 printf("Utf8 \"%s\"", str);
1470 ent_size = 2 + len;
1471 break;
1472 }
1473 case JVM_CONSTANT_Integer: {
1474 u4 val = Bytes::get_Java_u4(bytes);
1475 printf("int %d", *(int *) &val);
1476 ent_size = 4;
1477 break;
1478 }
1479 case JVM_CONSTANT_Float: {
1480 u4 val = Bytes::get_Java_u4(bytes);
1481 printf("float %5.3ff", *(float *) &val);
1482 ent_size = 4;
1483 break;
1484 }
1485 case JVM_CONSTANT_Long: {
1486 u8 val = Bytes::get_Java_u8(bytes);
1487 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1488 ent_size = 8;
1489 idx++; // Long takes two cpool slots
1490 break;
1491 }
1492 case JVM_CONSTANT_Double: {
1493 u8 val = Bytes::get_Java_u8(bytes);
1494 printf("double %5.3fd", *(jdouble *)&val);
1495 ent_size = 8;
1496 idx++; // Double takes two cpool slots
1497 break;
1498 }
1499 case JVM_CONSTANT_Class: {
1500 idx1 = Bytes::get_Java_u2(bytes);
1501 printf("class #%03d", idx1);
1502 ent_size = 2;
1503 break;
1504 }
1505 case JVM_CONSTANT_String: {
1506 idx1 = Bytes::get_Java_u2(bytes);
1507 printf("String #%03d", idx1);
1508 ent_size = 2;
1509 break;
1510 }
1511 case JVM_CONSTANT_Fieldref: {
1512 idx1 = Bytes::get_Java_u2(bytes);
1513 idx2 = Bytes::get_Java_u2(bytes+2);
1514 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1515 ent_size = 4;
1516 break;
1517 }
1518 case JVM_CONSTANT_Methodref: {
1519 idx1 = Bytes::get_Java_u2(bytes);
1520 idx2 = Bytes::get_Java_u2(bytes+2);
1521 printf("Method #%03d, #%03d", idx1, idx2);
1522 ent_size = 4;
1523 break;
1524 }
1525 case JVM_CONSTANT_InterfaceMethodref: {
1526 idx1 = Bytes::get_Java_u2(bytes);
1527 idx2 = Bytes::get_Java_u2(bytes+2);
1528 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1529 ent_size = 4;
1530 break;
1531 }
1532 case JVM_CONSTANT_NameAndType: {
1533 idx1 = Bytes::get_Java_u2(bytes);
1534 idx2 = Bytes::get_Java_u2(bytes+2);
1535 printf("NameAndType #%03d, #%03d", idx1, idx2);
1536 ent_size = 4;
1537 break;
1538 }
1539 case JVM_CONSTANT_ClassIndex: {
1540 printf("ClassIndex %s", WARN_MSG);
1541 break;
1542 }
1543 case JVM_CONSTANT_UnresolvedClass: {
1544 printf("UnresolvedClass: %s", WARN_MSG);
1545 break;
1546 }
1547 case JVM_CONSTANT_UnresolvedClassInError: {
1548 printf("UnresolvedClassInErr: %s", WARN_MSG);
1549 break;
1550 }
1551 case JVM_CONSTANT_StringIndex: {
1552 printf("StringIndex: %s", WARN_MSG);
1553 break;
1554 }
1555 }
1556 printf(";\n");
1557 bytes += ent_size;
1558 size += ent_size;
1559 }
1560 printf("Cpool size: %d\n", size);
1561 fflush(0);
1562 return;
1563 } /* end print_cpool_bytes */
1566 // Returns size of constant pool entry.
1567 jint ConstantPool::cpool_entry_size(jint idx) {
1568 switch(tag_at(idx).value()) {
1569 case JVM_CONSTANT_Invalid:
1570 case JVM_CONSTANT_Unicode:
1571 return 1;
1573 case JVM_CONSTANT_Utf8:
1574 return 3 + symbol_at(idx)->utf8_length();
1576 case JVM_CONSTANT_Class:
1577 case JVM_CONSTANT_String:
1578 case JVM_CONSTANT_ClassIndex:
1579 case JVM_CONSTANT_UnresolvedClass:
1580 case JVM_CONSTANT_UnresolvedClassInError:
1581 case JVM_CONSTANT_StringIndex:
1582 case JVM_CONSTANT_MethodType:
1583 case JVM_CONSTANT_MethodTypeInError:
1584 return 3;
1586 case JVM_CONSTANT_MethodHandle:
1587 case JVM_CONSTANT_MethodHandleInError:
1588 return 4; //tag, ref_kind, ref_index
1590 case JVM_CONSTANT_Integer:
1591 case JVM_CONSTANT_Float:
1592 case JVM_CONSTANT_Fieldref:
1593 case JVM_CONSTANT_Methodref:
1594 case JVM_CONSTANT_InterfaceMethodref:
1595 case JVM_CONSTANT_NameAndType:
1596 return 5;
1598 case JVM_CONSTANT_InvokeDynamic:
1599 // u1 tag, u2 bsm, u2 nt
1600 return 5;
1602 case JVM_CONSTANT_Long:
1603 case JVM_CONSTANT_Double:
1604 return 9;
1605 }
1606 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1607 return 1;
1608 } /* end cpool_entry_size */
1611 // SymbolHashMap is used to find a constant pool index from a string.
1612 // This function fills in SymbolHashMaps, one for utf8s and one for
1613 // class names, returns size of the cpool raw bytes.
1614 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1615 SymbolHashMap *classmap) {
1616 jint size = 0;
1618 for (u2 idx = 1; idx < length(); idx++) {
1619 u2 tag = tag_at(idx).value();
1620 size += cpool_entry_size(idx);
1622 switch(tag) {
1623 case JVM_CONSTANT_Utf8: {
1624 Symbol* sym = symbol_at(idx);
1625 symmap->add_entry(sym, idx);
1626 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1627 break;
1628 }
1629 case JVM_CONSTANT_Class:
1630 case JVM_CONSTANT_UnresolvedClass:
1631 case JVM_CONSTANT_UnresolvedClassInError: {
1632 Symbol* sym = klass_name_at(idx);
1633 classmap->add_entry(sym, idx);
1634 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1635 break;
1636 }
1637 case JVM_CONSTANT_Long:
1638 case JVM_CONSTANT_Double: {
1639 idx++; // Both Long and Double take two cpool slots
1640 break;
1641 }
1642 }
1643 }
1644 return size;
1645 } /* end hash_utf8_entries_to */
1648 // Copy cpool bytes.
1649 // Returns:
1650 // 0, in case of OutOfMemoryError
1651 // -1, in case of internal error
1652 // > 0, count of the raw cpool bytes that have been copied
1653 int ConstantPool::copy_cpool_bytes(int cpool_size,
1654 SymbolHashMap* tbl,
1655 unsigned char *bytes) {
1656 u2 idx1, idx2;
1657 jint size = 0;
1658 jint cnt = length();
1659 unsigned char *start_bytes = bytes;
1661 for (jint idx = 1; idx < cnt; idx++) {
1662 u1 tag = tag_at(idx).value();
1663 jint ent_size = cpool_entry_size(idx);
1665 assert(size + ent_size <= cpool_size, "Size mismatch");
1667 *bytes = tag;
1668 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1669 switch(tag) {
1670 case JVM_CONSTANT_Invalid: {
1671 DBG(printf("JVM_CONSTANT_Invalid"));
1672 break;
1673 }
1674 case JVM_CONSTANT_Unicode: {
1675 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1676 DBG(printf("JVM_CONSTANT_Unicode"));
1677 break;
1678 }
1679 case JVM_CONSTANT_Utf8: {
1680 Symbol* sym = symbol_at(idx);
1681 char* str = sym->as_utf8();
1682 // Warning! It's crashing on x86 with len = sym->utf8_length()
1683 int len = (int) strlen(str);
1684 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1685 for (int i = 0; i < len; i++) {
1686 bytes[3+i] = (u1) str[i];
1687 }
1688 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1689 break;
1690 }
1691 case JVM_CONSTANT_Integer: {
1692 jint val = int_at(idx);
1693 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1694 break;
1695 }
1696 case JVM_CONSTANT_Float: {
1697 jfloat val = float_at(idx);
1698 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1699 break;
1700 }
1701 case JVM_CONSTANT_Long: {
1702 jlong val = long_at(idx);
1703 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1704 idx++; // Long takes two cpool slots
1705 break;
1706 }
1707 case JVM_CONSTANT_Double: {
1708 jdouble val = double_at(idx);
1709 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1710 idx++; // Double takes two cpool slots
1711 break;
1712 }
1713 case JVM_CONSTANT_Class:
1714 case JVM_CONSTANT_UnresolvedClass:
1715 case JVM_CONSTANT_UnresolvedClassInError: {
1716 *bytes = JVM_CONSTANT_Class;
1717 Symbol* sym = klass_name_at(idx);
1718 idx1 = tbl->symbol_to_value(sym);
1719 assert(idx1 != 0, "Have not found a hashtable entry");
1720 Bytes::put_Java_u2((address) (bytes+1), idx1);
1721 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1722 break;
1723 }
1724 case JVM_CONSTANT_String: {
1725 *bytes = JVM_CONSTANT_String;
1726 Symbol* sym = unresolved_string_at(idx);
1727 idx1 = tbl->symbol_to_value(sym);
1728 assert(idx1 != 0, "Have not found a hashtable entry");
1729 Bytes::put_Java_u2((address) (bytes+1), idx1);
1730 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1731 break;
1732 }
1733 case JVM_CONSTANT_Fieldref:
1734 case JVM_CONSTANT_Methodref:
1735 case JVM_CONSTANT_InterfaceMethodref: {
1736 idx1 = uncached_klass_ref_index_at(idx);
1737 idx2 = uncached_name_and_type_ref_index_at(idx);
1738 Bytes::put_Java_u2((address) (bytes+1), idx1);
1739 Bytes::put_Java_u2((address) (bytes+3), idx2);
1740 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1741 break;
1742 }
1743 case JVM_CONSTANT_NameAndType: {
1744 idx1 = name_ref_index_at(idx);
1745 idx2 = signature_ref_index_at(idx);
1746 Bytes::put_Java_u2((address) (bytes+1), idx1);
1747 Bytes::put_Java_u2((address) (bytes+3), idx2);
1748 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1749 break;
1750 }
1751 case JVM_CONSTANT_ClassIndex: {
1752 *bytes = JVM_CONSTANT_Class;
1753 idx1 = klass_index_at(idx);
1754 Bytes::put_Java_u2((address) (bytes+1), idx1);
1755 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1756 break;
1757 }
1758 case JVM_CONSTANT_StringIndex: {
1759 *bytes = JVM_CONSTANT_String;
1760 idx1 = string_index_at(idx);
1761 Bytes::put_Java_u2((address) (bytes+1), idx1);
1762 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1763 break;
1764 }
1765 case JVM_CONSTANT_MethodHandle:
1766 case JVM_CONSTANT_MethodHandleInError: {
1767 *bytes = JVM_CONSTANT_MethodHandle;
1768 int kind = method_handle_ref_kind_at_error_ok(idx);
1769 idx1 = method_handle_index_at_error_ok(idx);
1770 *(bytes+1) = (unsigned char) kind;
1771 Bytes::put_Java_u2((address) (bytes+2), idx1);
1772 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1773 break;
1774 }
1775 case JVM_CONSTANT_MethodType:
1776 case JVM_CONSTANT_MethodTypeInError: {
1777 *bytes = JVM_CONSTANT_MethodType;
1778 idx1 = method_type_index_at_error_ok(idx);
1779 Bytes::put_Java_u2((address) (bytes+1), idx1);
1780 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1781 break;
1782 }
1783 case JVM_CONSTANT_InvokeDynamic: {
1784 *bytes = tag;
1785 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1786 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1787 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1788 Bytes::put_Java_u2((address) (bytes+1), idx1);
1789 Bytes::put_Java_u2((address) (bytes+3), idx2);
1790 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1791 break;
1792 }
1793 }
1794 DBG(printf("\n"));
1795 bytes += ent_size;
1796 size += ent_size;
1797 }
1798 assert(size == cpool_size, "Size mismatch");
1800 // Keep temorarily for debugging until it's stable.
1801 DBG(print_cpool_bytes(cnt, start_bytes));
1802 return (int)(bytes - start_bytes);
1803 } /* end copy_cpool_bytes */
1805 #undef DBG
1808 void ConstantPool::set_on_stack(const bool value) {
1809 if (value) {
1810 _flags |= _on_stack;
1811 } else {
1812 _flags &= ~_on_stack;
1813 }
1814 if (value) MetadataOnStackMark::record(this);
1815 }
1817 // JSR 292 support for patching constant pool oops after the class is linked and
1818 // the oop array for resolved references are created.
1819 // We can't do this during classfile parsing, which is how the other indexes are
1820 // patched. The other patches are applied early for some error checking
1821 // so only defer the pseudo_strings.
1822 void ConstantPool::patch_resolved_references(
1823 GrowableArray<Handle>* cp_patches) {
1824 assert(EnableInvokeDynamic, "");
1825 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1826 Handle patch = cp_patches->at(index);
1827 if (patch.not_null()) {
1828 assert (tag_at(index).is_string(), "should only be string left");
1829 // Patching a string means pre-resolving it.
1830 // The spelling in the constant pool is ignored.
1831 // The constant reference may be any object whatever.
1832 // If it is not a real interned string, the constant is referred
1833 // to as a "pseudo-string", and must be presented to the CP
1834 // explicitly, because it may require scavenging.
1835 int obj_index = cp_to_object_index(index);
1836 pseudo_string_at_put(index, obj_index, patch());
1837 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1838 }
1839 }
1840 #ifdef ASSERT
1841 // Ensure that all the patches have been used.
1842 for (int index = 0; index < cp_patches->length(); index++) {
1843 assert(cp_patches->at(index).is_null(),
1844 err_msg("Unused constant pool patch at %d in class file %s",
1845 index,
1846 pool_holder()->external_name()));
1847 }
1848 #endif // ASSERT
1849 }
1851 #ifndef PRODUCT
1853 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1854 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1855 guarantee(obj->is_constantPool(), "object must be constant pool");
1856 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1857 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1859 for (int i = 0; i< cp->length(); i++) {
1860 if (cp->tag_at(i).is_unresolved_klass()) {
1861 // This will force loading of the class
1862 Klass* klass = cp->klass_at(i, CHECK);
1863 if (klass->oop_is_instance()) {
1864 // Force initialization of class
1865 InstanceKlass::cast(klass)->initialize(CHECK);
1866 }
1867 }
1868 }
1869 }
1871 #endif
1874 // Printing
1876 void ConstantPool::print_on(outputStream* st) const {
1877 EXCEPTION_MARK;
1878 assert(is_constantPool(), "must be constantPool");
1879 st->print_cr(internal_name());
1880 if (flags() != 0) {
1881 st->print(" - flags: 0x%x", flags());
1882 if (has_preresolution()) st->print(" has_preresolution");
1883 if (on_stack()) st->print(" on_stack");
1884 st->cr();
1885 }
1886 if (pool_holder() != NULL) {
1887 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
1888 }
1889 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
1890 st->print_cr(" - resolved_references: " INTPTR_FORMAT, (void *)resolved_references());
1891 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
1893 for (int index = 1; index < length(); index++) { // Index 0 is unused
1894 ((ConstantPool*)this)->print_entry_on(index, st);
1895 switch (tag_at(index).value()) {
1896 case JVM_CONSTANT_Long :
1897 case JVM_CONSTANT_Double :
1898 index++; // Skip entry following eigth-byte constant
1899 }
1901 }
1902 st->cr();
1903 }
1905 // Print one constant pool entry
1906 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1907 EXCEPTION_MARK;
1908 st->print(" - %3d : ", index);
1909 tag_at(index).print_on(st);
1910 st->print(" : ");
1911 switch (tag_at(index).value()) {
1912 case JVM_CONSTANT_Class :
1913 { Klass* k = klass_at(index, CATCH);
1914 guarantee(k != NULL, "need klass");
1915 k->print_value_on(st);
1916 st->print(" {0x%lx}", (address)k);
1917 }
1918 break;
1919 case JVM_CONSTANT_Fieldref :
1920 case JVM_CONSTANT_Methodref :
1921 case JVM_CONSTANT_InterfaceMethodref :
1922 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1923 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1924 break;
1925 case JVM_CONSTANT_String :
1926 if (is_pseudo_string_at(index)) {
1927 oop anObj = pseudo_string_at(index);
1928 anObj->print_value_on(st);
1929 st->print(" {0x%lx}", (address)anObj);
1930 } else {
1931 unresolved_string_at(index)->print_value_on(st);
1932 }
1933 break;
1934 case JVM_CONSTANT_Integer :
1935 st->print("%d", int_at(index));
1936 break;
1937 case JVM_CONSTANT_Float :
1938 st->print("%f", float_at(index));
1939 break;
1940 case JVM_CONSTANT_Long :
1941 st->print_jlong(long_at(index));
1942 break;
1943 case JVM_CONSTANT_Double :
1944 st->print("%lf", double_at(index));
1945 break;
1946 case JVM_CONSTANT_NameAndType :
1947 st->print("name_index=%d", name_ref_index_at(index));
1948 st->print(" signature_index=%d", signature_ref_index_at(index));
1949 break;
1950 case JVM_CONSTANT_Utf8 :
1951 symbol_at(index)->print_value_on(st);
1952 break;
1953 case JVM_CONSTANT_UnresolvedClass : // fall-through
1954 case JVM_CONSTANT_UnresolvedClassInError: {
1955 // unresolved_klass_at requires lock or safe world.
1956 CPSlot entry = slot_at(index);
1957 if (entry.is_resolved()) {
1958 entry.get_klass()->print_value_on(st);
1959 } else {
1960 entry.get_symbol()->print_value_on(st);
1961 }
1962 }
1963 break;
1964 case JVM_CONSTANT_MethodHandle :
1965 case JVM_CONSTANT_MethodHandleInError :
1966 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index));
1967 st->print(" ref_index=%d", method_handle_index_at_error_ok(index));
1968 break;
1969 case JVM_CONSTANT_MethodType :
1970 case JVM_CONSTANT_MethodTypeInError :
1971 st->print("signature_index=%d", method_type_index_at_error_ok(index));
1972 break;
1973 case JVM_CONSTANT_InvokeDynamic :
1974 {
1975 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1976 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1977 int argc = invoke_dynamic_argument_count_at(index);
1978 if (argc > 0) {
1979 for (int arg_i = 0; arg_i < argc; arg_i++) {
1980 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1981 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1982 }
1983 st->print("}");
1984 }
1985 }
1986 break;
1987 default:
1988 ShouldNotReachHere();
1989 break;
1990 }
1991 st->cr();
1992 }
1994 void ConstantPool::print_value_on(outputStream* st) const {
1995 assert(is_constantPool(), "must be constantPool");
1996 st->print("constant pool [%d]", length());
1997 if (has_preresolution()) st->print("/preresolution");
1998 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
1999 print_address_on(st);
2000 st->print(" for ");
2001 pool_holder()->print_value_on(st);
2002 if (pool_holder() != NULL) {
2003 bool extra = (pool_holder()->constants() != this);
2004 if (extra) st->print(" (extra)");
2005 }
2006 if (cache() != NULL) {
2007 st->print(" cache=" PTR_FORMAT, cache());
2008 }
2009 }
2011 #if INCLUDE_SERVICES
2012 // Size Statistics
2013 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2014 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2015 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2016 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2017 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2018 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2020 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2021 sz->_cp_refmap_bytes;
2022 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2023 }
2024 #endif // INCLUDE_SERVICES
2026 // Verification
2028 void ConstantPool::verify_on(outputStream* st) {
2029 guarantee(is_constantPool(), "object must be constant pool");
2030 for (int i = 0; i< length(); i++) {
2031 constantTag tag = tag_at(i);
2032 CPSlot entry = slot_at(i);
2033 if (tag.is_klass()) {
2034 if (entry.is_resolved()) {
2035 guarantee(entry.get_klass()->is_klass(), "should be klass");
2036 }
2037 } else if (tag.is_unresolved_klass()) {
2038 if (entry.is_resolved()) {
2039 guarantee(entry.get_klass()->is_klass(), "should be klass");
2040 }
2041 } else if (tag.is_symbol()) {
2042 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2043 } else if (tag.is_string()) {
2044 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2045 }
2046 }
2047 if (cache() != NULL) {
2048 // Note: cache() can be NULL before a class is completely setup or
2049 // in temporary constant pools used during constant pool merging
2050 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2051 }
2052 if (pool_holder() != NULL) {
2053 // Note: pool_holder() can be NULL in temporary constant pools
2054 // used during constant pool merging
2055 guarantee(pool_holder()->is_klass(), "should be klass");
2056 }
2057 }
2060 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2061 char *str = sym->as_utf8();
2062 unsigned int hash = compute_hash(str, sym->utf8_length());
2063 unsigned int index = hash % table_size();
2065 // check if already in map
2066 // we prefer the first entry since it is more likely to be what was used in
2067 // the class file
2068 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2069 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2070 if (en->hash() == hash && en->symbol() == sym) {
2071 return; // already there
2072 }
2073 }
2075 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2076 entry->set_next(bucket(index));
2077 _buckets[index].set_entry(entry);
2078 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2079 }
2081 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2082 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2083 char *str = sym->as_utf8();
2084 int len = sym->utf8_length();
2085 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2086 unsigned int index = hash % table_size();
2087 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2088 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2089 if (en->hash() == hash && en->symbol() == sym) {
2090 return en;
2091 }
2092 }
2093 return NULL;
2094 }