Mon, 07 Oct 2013 12:20:28 -0400
8009130: Lambda: Fix access controls, loader constraints.
Summary: New default methods list with inherited superinterface methods
Reviewed-by: minqi, sspitsyn, coleenp
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
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7 * published by the Free Software Foundation.
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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).
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15 * You should have received a copy of the GNU General Public License version
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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/synchronizer.hpp"
44 #include "runtime/vframe.hpp"
46 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
47 // Tags are RW but comment below applies to tags also.
48 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
50 int size = ConstantPool::size(length);
52 // CDS considerations:
53 // Allocate read-write but may be able to move to read-only at dumping time
54 // if all the klasses are resolved. The only other field that is writable is
55 // the resolved_references array, which is recreated at startup time.
56 // But that could be moved to InstanceKlass (although a pain to access from
57 // assembly code). Maybe it could be moved to the cpCache which is RW.
58 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
59 }
61 ConstantPool::ConstantPool(Array<u1>* tags) {
62 set_length(tags->length());
63 set_tags(NULL);
64 set_cache(NULL);
65 set_reference_map(NULL);
66 set_resolved_references(NULL);
67 set_operands(NULL);
68 set_pool_holder(NULL);
69 set_flags(0);
71 // only set to non-zero if constant pool is merged by RedefineClasses
72 set_version(0);
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();
98 }
100 objArrayOop ConstantPool::resolved_references() const {
101 return (objArrayOop)JNIHandles::resolve(_resolved_references);
102 }
104 // Create resolved_references array and mapping array for original cp indexes
105 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
106 // to map it back for resolving and some unlikely miscellaneous uses.
107 // The objects created by invokedynamic are appended to this list.
108 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
109 intStack reference_map,
110 int constant_pool_map_length,
111 TRAPS) {
112 // Initialized the resolved object cache.
113 int map_length = reference_map.length();
114 if (map_length > 0) {
115 // Only need mapping back to constant pool entries. The map isn't used for
116 // invokedynamic resolved_reference entries. For invokedynamic entries,
117 // the constant pool cache index has the mapping back to both the constant
118 // pool and to the resolved reference index.
119 if (constant_pool_map_length > 0) {
120 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
122 for (int i = 0; i < constant_pool_map_length; i++) {
123 int x = reference_map.at(i);
124 assert(x == (int)(jushort) x, "klass index is too big");
125 om->at_put(i, (jushort)x);
126 }
127 set_reference_map(om);
128 }
130 // Create Java array for holding resolved strings, methodHandles,
131 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
132 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
133 Handle refs_handle (THREAD, (oop)stom); // must handleize.
134 set_resolved_references(loader_data->add_handle(refs_handle));
135 }
136 }
138 // CDS support. Create a new resolved_references array.
139 void ConstantPool::restore_unshareable_info(TRAPS) {
141 // restore the C++ vtable from the shared archive
142 restore_vtable();
144 if (SystemDictionary::Object_klass_loaded()) {
145 // Recreate the object array and add to ClassLoaderData.
146 int map_length = resolved_reference_length();
147 if (map_length > 0) {
148 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
149 Handle refs_handle (THREAD, (oop)stom); // must handleize.
151 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
152 set_resolved_references(loader_data->add_handle(refs_handle));
153 }
154 }
155 }
157 void ConstantPool::remove_unshareable_info() {
158 // Resolved references are not in the shared archive.
159 // Save the length for restoration. It is not necessarily the same length
160 // as reference_map.length() if invokedynamic is saved.
161 set_resolved_reference_length(
162 resolved_references() != NULL ? resolved_references()->length() : 0);
163 set_resolved_references(NULL);
164 }
166 oop ConstantPool::lock() {
167 if (_pool_holder) {
168 // We re-use the _pool_holder's init_lock to reduce footprint.
169 // Notes on deadlocks:
170 // [1] This lock is a Java oop, so it can be recursively locked by
171 // the same thread without self-deadlocks.
172 // [2] Deadlock will happen if there is circular dependency between
173 // the <clinit> of two Java classes. However, in this case,
174 // the deadlock would have happened long before we reach
175 // ConstantPool::lock(), so reusing init_lock does not
176 // increase the possibility of deadlock.
177 return _pool_holder->init_lock();
178 } else {
179 return NULL;
180 }
181 }
183 int ConstantPool::cp_to_object_index(int cp_index) {
184 // this is harder don't do this so much.
185 int i = reference_map()->find(cp_index);
186 // We might not find the index for jsr292 call.
187 return (i < 0) ? _no_index_sentinel : i;
188 }
190 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
191 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
192 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
193 // tag is not updated atomicly.
195 CPSlot entry = this_oop->slot_at(which);
196 if (entry.is_resolved()) {
197 assert(entry.get_klass()->is_klass(), "must be");
198 // Already resolved - return entry.
199 return entry.get_klass();
200 }
202 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
203 // already has updated the object
204 assert(THREAD->is_Java_thread(), "must be a Java thread");
205 bool do_resolve = false;
206 bool in_error = false;
208 // Create a handle for the mirror. This will preserve the resolved class
209 // until the loader_data is registered.
210 Handle mirror_handle;
212 Symbol* name = NULL;
213 Handle loader;
214 {
215 oop cplock = this_oop->lock();
216 ObjectLocker ol(cplock , THREAD, cplock != NULL);
218 if (this_oop->tag_at(which).is_unresolved_klass()) {
219 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
220 in_error = true;
221 } else {
222 do_resolve = true;
223 name = this_oop->unresolved_klass_at(which);
224 loader = Handle(THREAD, this_oop->pool_holder()->class_loader());
225 }
226 }
227 } // unlocking constantPool
230 // The original attempt to resolve this constant pool entry failed so find the
231 // original error and throw it again (JVMS 5.4.3).
232 if (in_error) {
233 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
234 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
235 ResourceMark rm;
236 // exception text will be the class name
237 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
238 THROW_MSG_0(error, className);
239 }
241 if (do_resolve) {
242 // this_oop must be unlocked during resolve_or_fail
243 oop protection_domain = this_oop->pool_holder()->protection_domain();
244 Handle h_prot (THREAD, protection_domain);
245 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
246 KlassHandle k;
247 if (!HAS_PENDING_EXCEPTION) {
248 k = KlassHandle(THREAD, k_oop);
249 // preserve the resolved klass.
250 mirror_handle = Handle(THREAD, k_oop->java_mirror());
251 // Do access check for klasses
252 verify_constant_pool_resolve(this_oop, k, THREAD);
253 }
255 // Failed to resolve class. We must record the errors so that subsequent attempts
256 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
257 if (HAS_PENDING_EXCEPTION) {
258 ResourceMark rm;
259 Symbol* error = PENDING_EXCEPTION->klass()->name();
261 bool throw_orig_error = false;
262 {
263 oop cplock = this_oop->lock();
264 ObjectLocker ol(cplock, THREAD, cplock != NULL);
266 // some other thread has beaten us and has resolved the class.
267 if (this_oop->tag_at(which).is_klass()) {
268 CLEAR_PENDING_EXCEPTION;
269 entry = this_oop->resolved_klass_at(which);
270 return entry.get_klass();
271 }
273 if (!PENDING_EXCEPTION->
274 is_a(SystemDictionary::LinkageError_klass())) {
275 // Just throw the exception and don't prevent these classes from
276 // being loaded due to virtual machine errors like StackOverflow
277 // and OutOfMemoryError, etc, or if the thread was hit by stop()
278 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
279 }
280 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
281 SystemDictionary::add_resolution_error(this_oop, which, error);
282 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
283 } else {
284 // some other thread has put the class in error state.
285 error = SystemDictionary::find_resolution_error(this_oop, which);
286 assert(error != NULL, "checking");
287 throw_orig_error = true;
288 }
289 } // unlocked
291 if (throw_orig_error) {
292 CLEAR_PENDING_EXCEPTION;
293 ResourceMark rm;
294 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
295 THROW_MSG_0(error, className);
296 }
298 return 0;
299 }
301 if (TraceClassResolution && !k()->oop_is_array()) {
302 // skip resolving the constant pool so that this code get's
303 // called the next time some bytecodes refer to this class.
304 ResourceMark rm;
305 int line_number = -1;
306 const char * source_file = NULL;
307 if (JavaThread::current()->has_last_Java_frame()) {
308 // try to identify the method which called this function.
309 vframeStream vfst(JavaThread::current());
310 if (!vfst.at_end()) {
311 line_number = vfst.method()->line_number_from_bci(vfst.bci());
312 Symbol* s = vfst.method()->method_holder()->source_file_name();
313 if (s != NULL) {
314 source_file = s->as_C_string();
315 }
316 }
317 }
318 if (k() != this_oop->pool_holder()) {
319 // only print something if the classes are different
320 if (source_file != NULL) {
321 tty->print("RESOLVE %s %s %s:%d\n",
322 this_oop->pool_holder()->external_name(),
323 InstanceKlass::cast(k())->external_name(), source_file, line_number);
324 } else {
325 tty->print("RESOLVE %s %s\n",
326 this_oop->pool_holder()->external_name(),
327 InstanceKlass::cast(k())->external_name());
328 }
329 }
330 return k();
331 } else {
332 oop cplock = this_oop->lock();
333 ObjectLocker ol(cplock, THREAD, cplock != NULL);
334 // Only updated constant pool - if it is resolved.
335 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
336 if (do_resolve) {
337 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data();
338 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
339 this_oop->klass_at_put(which, k());
340 }
341 }
342 }
344 entry = this_oop->resolved_klass_at(which);
345 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
346 return entry.get_klass();
347 }
350 // Does not update ConstantPool* - to avoid any exception throwing. Used
351 // by compiler and exception handling. Also used to avoid classloads for
352 // instanceof operations. Returns NULL if the class has not been loaded or
353 // if the verification of constant pool failed
354 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
355 CPSlot entry = this_oop->slot_at(which);
356 if (entry.is_resolved()) {
357 assert(entry.get_klass()->is_klass(), "must be");
358 return entry.get_klass();
359 } else {
360 assert(entry.is_unresolved(), "must be either symbol or klass");
361 Thread *thread = Thread::current();
362 Symbol* name = entry.get_symbol();
363 oop loader = this_oop->pool_holder()->class_loader();
364 oop protection_domain = this_oop->pool_holder()->protection_domain();
365 Handle h_prot (thread, protection_domain);
366 Handle h_loader (thread, loader);
367 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
369 if (k != NULL) {
370 // Make sure that resolving is legal
371 EXCEPTION_MARK;
372 KlassHandle klass(THREAD, k);
373 // return NULL if verification fails
374 verify_constant_pool_resolve(this_oop, klass, THREAD);
375 if (HAS_PENDING_EXCEPTION) {
376 CLEAR_PENDING_EXCEPTION;
377 return NULL;
378 }
379 return klass();
380 } else {
381 return k;
382 }
383 }
384 }
387 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
388 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
389 }
392 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
393 int which) {
394 if (cpool->cache() == NULL) return NULL; // nothing to load yet
395 int cache_index = decode_cpcache_index(which, true);
396 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
397 // FIXME: should be an assert
398 if (PrintMiscellaneous && (Verbose||WizardMode)) {
399 tty->print_cr("bad operand %d in:", which); cpool->print();
400 }
401 return NULL;
402 }
403 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
404 return e->method_if_resolved(cpool);
405 }
408 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
409 if (cpool->cache() == NULL) return false; // nothing to load yet
410 int cache_index = decode_cpcache_index(which, true);
411 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
412 return e->has_appendix();
413 }
415 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
416 if (cpool->cache() == NULL) return NULL; // nothing to load yet
417 int cache_index = decode_cpcache_index(which, true);
418 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
419 return e->appendix_if_resolved(cpool);
420 }
423 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) {
424 if (cpool->cache() == NULL) return false; // nothing to load yet
425 int cache_index = decode_cpcache_index(which, true);
426 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
427 return e->has_method_type();
428 }
430 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) {
431 if (cpool->cache() == NULL) return NULL; // nothing to load yet
432 int cache_index = decode_cpcache_index(which, true);
433 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
434 return e->method_type_if_resolved(cpool);
435 }
438 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
439 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
440 return symbol_at(name_index);
441 }
444 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
445 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
446 return symbol_at(signature_index);
447 }
450 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
451 int i = which;
452 if (!uncached && cache() != NULL) {
453 if (ConstantPool::is_invokedynamic_index(which)) {
454 // Invokedynamic index is index into resolved_references
455 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
456 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
457 assert(tag_at(pool_index).is_name_and_type(), "");
458 return pool_index;
459 }
460 // change byte-ordering and go via cache
461 i = remap_instruction_operand_from_cache(which);
462 } else {
463 if (tag_at(which).is_invoke_dynamic()) {
464 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
465 assert(tag_at(pool_index).is_name_and_type(), "");
466 return pool_index;
467 }
468 }
469 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
470 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
471 jint ref_index = *int_at_addr(i);
472 return extract_high_short_from_int(ref_index);
473 }
476 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
477 guarantee(!ConstantPool::is_invokedynamic_index(which),
478 "an invokedynamic instruction does not have a klass");
479 int i = which;
480 if (!uncached && cache() != NULL) {
481 // change byte-ordering and go via cache
482 i = remap_instruction_operand_from_cache(which);
483 }
484 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
485 jint ref_index = *int_at_addr(i);
486 return extract_low_short_from_int(ref_index);
487 }
491 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
492 int cpc_index = operand;
493 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
494 assert((int)(u2)cpc_index == cpc_index, "clean u2");
495 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
496 return member_index;
497 }
500 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
501 if (k->oop_is_instance() || k->oop_is_objArray()) {
502 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
503 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
504 KlassHandle element (THREAD, elem_oop);
506 // The element type could be a typeArray - we only need the access check if it is
507 // an reference to another class
508 if (element->oop_is_instance()) {
509 LinkResolver::check_klass_accessability(holder, element, CHECK);
510 }
511 }
512 }
515 int ConstantPool::name_ref_index_at(int which_nt) {
516 jint ref_index = name_and_type_at(which_nt);
517 return extract_low_short_from_int(ref_index);
518 }
521 int ConstantPool::signature_ref_index_at(int which_nt) {
522 jint ref_index = name_and_type_at(which_nt);
523 return extract_high_short_from_int(ref_index);
524 }
527 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
528 return klass_at(klass_ref_index_at(which), CHECK_NULL);
529 }
532 Symbol* ConstantPool::klass_name_at(int which) {
533 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
534 "Corrupted constant pool");
535 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
536 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
537 // tag is not updated atomicly.
538 CPSlot entry = slot_at(which);
539 if (entry.is_resolved()) {
540 // Already resolved - return entry's name.
541 assert(entry.get_klass()->is_klass(), "must be");
542 return entry.get_klass()->name();
543 } else {
544 assert(entry.is_unresolved(), "must be either symbol or klass");
545 return entry.get_symbol();
546 }
547 }
549 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
550 jint ref_index = klass_ref_index_at(which);
551 return klass_at_noresolve(ref_index);
552 }
554 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
555 jint ref_index = uncached_klass_ref_index_at(which);
556 return klass_at_noresolve(ref_index);
557 }
559 char* ConstantPool::string_at_noresolve(int which) {
560 Symbol* s = unresolved_string_at(which);
561 if (s == NULL) {
562 return (char*)"<pseudo-string>";
563 } else {
564 return unresolved_string_at(which)->as_C_string();
565 }
566 }
568 BasicType ConstantPool::basic_type_for_signature_at(int which) {
569 return FieldType::basic_type(symbol_at(which));
570 }
573 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
574 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
575 if (this_oop->tag_at(index).is_string()) {
576 this_oop->string_at(index, CHECK);
577 }
578 }
579 }
581 // Resolve all the classes in the constant pool. If they are all resolved,
582 // the constant pool is read-only. Enhancement: allocate cp entries to
583 // another metaspace, and copy to read-only or read-write space if this
584 // bit is set.
585 bool ConstantPool::resolve_class_constants(TRAPS) {
586 constantPoolHandle cp(THREAD, this);
587 for (int index = 1; index < length(); index++) { // Index 0 is unused
588 if (tag_at(index).is_unresolved_klass() &&
589 klass_at_if_loaded(cp, index) == NULL) {
590 return false;
591 }
592 }
593 // set_preresolution(); or some bit for future use
594 return true;
595 }
597 // If resolution for MethodHandle or MethodType fails, save the exception
598 // in the resolution error table, so that the same exception is thrown again.
599 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
600 int tag, TRAPS) {
601 ResourceMark rm;
602 Symbol* error = PENDING_EXCEPTION->klass()->name();
603 oop cplock = this_oop->lock();
604 ObjectLocker ol(cplock, THREAD, cplock != NULL); // lock cpool to change tag.
606 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
607 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
609 if (!PENDING_EXCEPTION->
610 is_a(SystemDictionary::LinkageError_klass())) {
611 // Just throw the exception and don't prevent these classes from
612 // being loaded due to virtual machine errors like StackOverflow
613 // and OutOfMemoryError, etc, or if the thread was hit by stop()
614 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
616 } else if (this_oop->tag_at(which).value() != error_tag) {
617 SystemDictionary::add_resolution_error(this_oop, which, error);
618 this_oop->tag_at_put(which, error_tag);
619 } else {
620 // some other thread has put the class in error state.
621 error = SystemDictionary::find_resolution_error(this_oop, which);
622 assert(error != NULL, "checking");
623 CLEAR_PENDING_EXCEPTION;
624 THROW_MSG(error, "");
625 }
626 }
629 // Called to resolve constants in the constant pool and return an oop.
630 // Some constant pool entries cache their resolved oop. This is also
631 // called to create oops from constants to use in arguments for invokedynamic
632 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
633 oop result_oop = NULL;
634 Handle throw_exception;
636 if (cache_index == _possible_index_sentinel) {
637 // It is possible that this constant is one which is cached in the objects.
638 // We'll do a linear search. This should be OK because this usage is rare.
639 assert(index > 0, "valid index");
640 cache_index = this_oop->cp_to_object_index(index);
641 }
642 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
643 assert(index == _no_index_sentinel || index >= 0, "");
645 if (cache_index >= 0) {
646 result_oop = this_oop->resolved_references()->obj_at(cache_index);
647 if (result_oop != NULL) {
648 return result_oop;
649 // That was easy...
650 }
651 index = this_oop->object_to_cp_index(cache_index);
652 }
654 jvalue prim_value; // temp used only in a few cases below
656 int tag_value = this_oop->tag_at(index).value();
658 switch (tag_value) {
660 case JVM_CONSTANT_UnresolvedClass:
661 case JVM_CONSTANT_UnresolvedClassInError:
662 case JVM_CONSTANT_Class:
663 {
664 assert(cache_index == _no_index_sentinel, "should not have been set");
665 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
666 // ldc wants the java mirror.
667 result_oop = resolved->java_mirror();
668 break;
669 }
671 case JVM_CONSTANT_String:
672 assert(cache_index != _no_index_sentinel, "should have been set");
673 if (this_oop->is_pseudo_string_at(index)) {
674 result_oop = this_oop->pseudo_string_at(index, cache_index);
675 break;
676 }
677 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
678 break;
680 case JVM_CONSTANT_MethodHandleInError:
681 case JVM_CONSTANT_MethodTypeInError:
682 {
683 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
684 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
685 ResourceMark rm;
686 THROW_MSG_0(error, "");
687 break;
688 }
690 case JVM_CONSTANT_MethodHandle:
691 {
692 int ref_kind = this_oop->method_handle_ref_kind_at(index);
693 int callee_index = this_oop->method_handle_klass_index_at(index);
694 Symbol* name = this_oop->method_handle_name_ref_at(index);
695 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
696 if (PrintMiscellaneous)
697 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
698 ref_kind, index, this_oop->method_handle_index_at(index),
699 callee_index, name->as_C_string(), signature->as_C_string());
700 KlassHandle callee;
701 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
702 callee = KlassHandle(THREAD, k);
703 }
704 KlassHandle klass(THREAD, this_oop->pool_holder());
705 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
706 callee, name, signature,
707 THREAD);
708 result_oop = value();
709 if (HAS_PENDING_EXCEPTION) {
710 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
711 }
712 break;
713 }
715 case JVM_CONSTANT_MethodType:
716 {
717 Symbol* signature = this_oop->method_type_signature_at(index);
718 if (PrintMiscellaneous)
719 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
720 index, this_oop->method_type_index_at(index),
721 signature->as_C_string());
722 KlassHandle klass(THREAD, this_oop->pool_holder());
723 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
724 result_oop = value();
725 if (HAS_PENDING_EXCEPTION) {
726 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
727 }
728 break;
729 }
731 case JVM_CONSTANT_Integer:
732 assert(cache_index == _no_index_sentinel, "should not have been set");
733 prim_value.i = this_oop->int_at(index);
734 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
735 break;
737 case JVM_CONSTANT_Float:
738 assert(cache_index == _no_index_sentinel, "should not have been set");
739 prim_value.f = this_oop->float_at(index);
740 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
741 break;
743 case JVM_CONSTANT_Long:
744 assert(cache_index == _no_index_sentinel, "should not have been set");
745 prim_value.j = this_oop->long_at(index);
746 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
747 break;
749 case JVM_CONSTANT_Double:
750 assert(cache_index == _no_index_sentinel, "should not have been set");
751 prim_value.d = this_oop->double_at(index);
752 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
753 break;
755 default:
756 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
757 this_oop(), index, cache_index, tag_value) );
758 assert(false, "unexpected constant tag");
759 break;
760 }
762 if (cache_index >= 0) {
763 // Cache the oop here also.
764 Handle result_handle(THREAD, result_oop);
765 oop cplock = this_oop->lock();
766 ObjectLocker ol(cplock, THREAD, cplock != NULL); // don't know if we really need this
767 oop result = this_oop->resolved_references()->obj_at(cache_index);
768 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
769 // The important thing here is that all threads pick up the same result.
770 // It doesn't matter which racing thread wins, as long as only one
771 // result is used by all threads, and all future queries.
772 // That result may be either a resolved constant or a failure exception.
773 if (result == NULL) {
774 this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
775 return result_handle();
776 } else {
777 // Return the winning thread's result. This can be different than
778 // result_handle() for MethodHandles.
779 return result;
780 }
781 } else {
782 return result_oop;
783 }
784 }
786 oop ConstantPool::uncached_string_at(int which, TRAPS) {
787 Symbol* sym = unresolved_string_at(which);
788 oop str = StringTable::intern(sym, CHECK_(NULL));
789 assert(java_lang_String::is_instance(str), "must be string");
790 return str;
791 }
794 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
795 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
797 Handle bsm;
798 int argc;
799 {
800 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
801 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
802 // It is accompanied by the optional arguments.
803 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
804 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
805 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
806 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
807 }
809 // Extract the optional static arguments.
810 argc = this_oop->invoke_dynamic_argument_count_at(index);
811 if (argc == 0) return bsm_oop;
813 bsm = Handle(THREAD, bsm_oop);
814 }
816 objArrayHandle info;
817 {
818 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
819 info = objArrayHandle(THREAD, info_oop);
820 }
822 info->obj_at_put(0, bsm());
823 for (int i = 0; i < argc; i++) {
824 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
825 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
826 info->obj_at_put(1+i, arg_oop);
827 }
829 return info();
830 }
832 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
833 // If the string has already been interned, this entry will be non-null
834 oop str = this_oop->resolved_references()->obj_at(obj_index);
835 if (str != NULL) return str;
836 Symbol* sym = this_oop->unresolved_string_at(which);
837 str = StringTable::intern(sym, CHECK_(NULL));
838 this_oop->string_at_put(which, obj_index, str);
839 assert(java_lang_String::is_instance(str), "must be string");
840 return str;
841 }
844 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
845 int which) {
846 // Names are interned, so we can compare Symbol*s directly
847 Symbol* cp_name = klass_name_at(which);
848 return (cp_name == k->name());
849 }
852 // Iterate over symbols and decrement ones which are Symbol*s.
853 // This is done during GC so do not need to lock constantPool unless we
854 // have per-thread safepoints.
855 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
856 // these symbols but didn't increment the reference count.
857 void ConstantPool::unreference_symbols() {
858 for (int index = 1; index < length(); index++) { // Index 0 is unused
859 constantTag tag = tag_at(index);
860 if (tag.is_symbol()) {
861 symbol_at(index)->decrement_refcount();
862 }
863 }
864 }
867 // Compare this constant pool's entry at index1 to the constant pool
868 // cp2's entry at index2.
869 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
870 int index2, TRAPS) {
872 jbyte t1 = tag_at(index1).value();
873 jbyte t2 = cp2->tag_at(index2).value();
876 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
877 // when comparing
878 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
879 t1 = JVM_CONSTANT_UnresolvedClass;
880 }
881 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
882 t2 = JVM_CONSTANT_UnresolvedClass;
883 }
885 if (t1 != t2) {
886 // Not the same entry type so there is nothing else to check. Note
887 // that this style of checking will consider resolved/unresolved
888 // class pairs as different.
889 // From the ConstantPool* API point of view, this is correct
890 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
891 // plays out in the context of ConstantPool* merging.
892 return false;
893 }
895 switch (t1) {
896 case JVM_CONSTANT_Class:
897 {
898 Klass* k1 = klass_at(index1, CHECK_false);
899 Klass* k2 = cp2->klass_at(index2, CHECK_false);
900 if (k1 == k2) {
901 return true;
902 }
903 } break;
905 case JVM_CONSTANT_ClassIndex:
906 {
907 int recur1 = klass_index_at(index1);
908 int recur2 = cp2->klass_index_at(index2);
909 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
910 if (match) {
911 return true;
912 }
913 } break;
915 case JVM_CONSTANT_Double:
916 {
917 jdouble d1 = double_at(index1);
918 jdouble d2 = cp2->double_at(index2);
919 if (d1 == d2) {
920 return true;
921 }
922 } break;
924 case JVM_CONSTANT_Fieldref:
925 case JVM_CONSTANT_InterfaceMethodref:
926 case JVM_CONSTANT_Methodref:
927 {
928 int recur1 = uncached_klass_ref_index_at(index1);
929 int recur2 = cp2->uncached_klass_ref_index_at(index2);
930 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
931 if (match) {
932 recur1 = uncached_name_and_type_ref_index_at(index1);
933 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
934 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
935 if (match) {
936 return true;
937 }
938 }
939 } break;
941 case JVM_CONSTANT_Float:
942 {
943 jfloat f1 = float_at(index1);
944 jfloat f2 = cp2->float_at(index2);
945 if (f1 == f2) {
946 return true;
947 }
948 } break;
950 case JVM_CONSTANT_Integer:
951 {
952 jint i1 = int_at(index1);
953 jint i2 = cp2->int_at(index2);
954 if (i1 == i2) {
955 return true;
956 }
957 } break;
959 case JVM_CONSTANT_Long:
960 {
961 jlong l1 = long_at(index1);
962 jlong l2 = cp2->long_at(index2);
963 if (l1 == l2) {
964 return true;
965 }
966 } break;
968 case JVM_CONSTANT_NameAndType:
969 {
970 int recur1 = name_ref_index_at(index1);
971 int recur2 = cp2->name_ref_index_at(index2);
972 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
973 if (match) {
974 recur1 = signature_ref_index_at(index1);
975 recur2 = cp2->signature_ref_index_at(index2);
976 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
977 if (match) {
978 return true;
979 }
980 }
981 } break;
983 case JVM_CONSTANT_StringIndex:
984 {
985 int recur1 = string_index_at(index1);
986 int recur2 = cp2->string_index_at(index2);
987 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
988 if (match) {
989 return true;
990 }
991 } break;
993 case JVM_CONSTANT_UnresolvedClass:
994 {
995 Symbol* k1 = unresolved_klass_at(index1);
996 Symbol* k2 = cp2->unresolved_klass_at(index2);
997 if (k1 == k2) {
998 return true;
999 }
1000 } break;
1002 case JVM_CONSTANT_MethodType:
1003 {
1004 int k1 = method_type_index_at(index1);
1005 int k2 = cp2->method_type_index_at(index2);
1006 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1007 if (match) {
1008 return true;
1009 }
1010 } break;
1012 case JVM_CONSTANT_MethodHandle:
1013 {
1014 int k1 = method_handle_ref_kind_at(index1);
1015 int k2 = cp2->method_handle_ref_kind_at(index2);
1016 if (k1 == k2) {
1017 int i1 = method_handle_index_at(index1);
1018 int i2 = cp2->method_handle_index_at(index2);
1019 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1020 if (match) {
1021 return true;
1022 }
1023 }
1024 } break;
1026 case JVM_CONSTANT_InvokeDynamic:
1027 {
1028 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1029 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1030 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1031 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1032 // separate statements and variables because CHECK_false is used
1033 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1034 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1035 return (match_entry && match_operand);
1036 } break;
1038 case JVM_CONSTANT_String:
1039 {
1040 Symbol* s1 = unresolved_string_at(index1);
1041 Symbol* s2 = cp2->unresolved_string_at(index2);
1042 if (s1 == s2) {
1043 return true;
1044 }
1045 } break;
1047 case JVM_CONSTANT_Utf8:
1048 {
1049 Symbol* s1 = symbol_at(index1);
1050 Symbol* s2 = cp2->symbol_at(index2);
1051 if (s1 == s2) {
1052 return true;
1053 }
1054 } break;
1056 // Invalid is used as the tag for the second constant pool entry
1057 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1058 // not be seen by itself.
1059 case JVM_CONSTANT_Invalid: // fall through
1061 default:
1062 ShouldNotReachHere();
1063 break;
1064 }
1066 return false;
1067 } // end compare_entry_to()
1070 // Resize the operands array with delta_len and delta_size.
1071 // Used in RedefineClasses for CP merge.
1072 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1073 int old_len = operand_array_length(operands());
1074 int new_len = old_len + delta_len;
1075 int min_len = (delta_len > 0) ? old_len : new_len;
1077 int old_size = operands()->length();
1078 int new_size = old_size + delta_size;
1079 int min_size = (delta_size > 0) ? old_size : new_size;
1081 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1082 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1084 // Set index in the resized array for existing elements only
1085 for (int idx = 0; idx < min_len; idx++) {
1086 int offset = operand_offset_at(idx); // offset in original array
1087 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1088 }
1089 // Copy the bootstrap specifiers only
1090 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1091 new_ops->adr_at(2*new_len),
1092 (min_size - 2*min_len) * sizeof(u2));
1093 // Explicitly deallocate old operands array.
1094 // Note, it is not needed for 7u backport.
1095 if ( operands() != NULL) { // the safety check
1096 MetadataFactory::free_array<u2>(loader_data, operands());
1097 }
1098 set_operands(new_ops);
1099 } // end resize_operands()
1102 // Extend the operands array with the length and size of the ext_cp operands.
1103 // Used in RedefineClasses for CP merge.
1104 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) {
1105 int delta_len = operand_array_length(ext_cp->operands());
1106 if (delta_len == 0) {
1107 return; // nothing to do
1108 }
1109 int delta_size = ext_cp->operands()->length();
1111 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1113 if (operand_array_length(operands()) == 0) {
1114 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1115 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1116 // The first element index defines the offset of second part
1117 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1118 set_operands(new_ops);
1119 } else {
1120 resize_operands(delta_len, delta_size, CHECK);
1121 }
1123 } // end extend_operands()
1126 // Shrink the operands array to a smaller array with new_len length.
1127 // Used in RedefineClasses for CP merge.
1128 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1129 int old_len = operand_array_length(operands());
1130 if (new_len == old_len) {
1131 return; // nothing to do
1132 }
1133 assert(new_len < old_len, "shrunken operands array must be smaller");
1135 int free_base = operand_next_offset_at(new_len - 1);
1136 int delta_len = new_len - old_len;
1137 int delta_size = 2*delta_len + free_base - operands()->length();
1139 resize_operands(delta_len, delta_size, CHECK);
1141 } // end shrink_operands()
1144 void ConstantPool::copy_operands(constantPoolHandle from_cp,
1145 constantPoolHandle to_cp,
1146 TRAPS) {
1148 int from_oplen = operand_array_length(from_cp->operands());
1149 int old_oplen = operand_array_length(to_cp->operands());
1150 if (from_oplen != 0) {
1151 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1152 // append my operands to the target's operands array
1153 if (old_oplen == 0) {
1154 // Can't just reuse from_cp's operand list because of deallocation issues
1155 int len = from_cp->operands()->length();
1156 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1157 Copy::conjoint_memory_atomic(
1158 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1159 to_cp->set_operands(new_ops);
1160 } else {
1161 int old_len = to_cp->operands()->length();
1162 int from_len = from_cp->operands()->length();
1163 int old_off = old_oplen * sizeof(u2);
1164 int from_off = from_oplen * sizeof(u2);
1165 // Use the metaspace for the destination constant pool
1166 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1167 int fillp = 0, len = 0;
1168 // first part of dest
1169 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1170 new_operands->adr_at(fillp),
1171 (len = old_off) * sizeof(u2));
1172 fillp += len;
1173 // first part of src
1174 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1175 new_operands->adr_at(fillp),
1176 (len = from_off) * sizeof(u2));
1177 fillp += len;
1178 // second part of dest
1179 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1180 new_operands->adr_at(fillp),
1181 (len = old_len - old_off) * sizeof(u2));
1182 fillp += len;
1183 // second part of src
1184 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1185 new_operands->adr_at(fillp),
1186 (len = from_len - from_off) * sizeof(u2));
1187 fillp += len;
1188 assert(fillp == new_operands->length(), "");
1190 // Adjust indexes in the first part of the copied operands array.
1191 for (int j = 0; j < from_oplen; j++) {
1192 int offset = operand_offset_at(new_operands, old_oplen + j);
1193 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1194 offset += old_len; // every new tuple is preceded by old_len extra u2's
1195 operand_offset_at_put(new_operands, old_oplen + j, offset);
1196 }
1198 // replace target operands array with combined array
1199 to_cp->set_operands(new_operands);
1200 }
1201 }
1202 } // end copy_operands()
1205 // Copy this constant pool's entries at start_i to end_i (inclusive)
1206 // to the constant pool to_cp's entries starting at to_i. A total of
1207 // (end_i - start_i) + 1 entries are copied.
1208 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1209 constantPoolHandle to_cp, int to_i, TRAPS) {
1212 int dest_i = to_i; // leave original alone for debug purposes
1214 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1215 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1217 switch (from_cp->tag_at(src_i).value()) {
1218 case JVM_CONSTANT_Double:
1219 case JVM_CONSTANT_Long:
1220 // double and long take two constant pool entries
1221 src_i += 2;
1222 dest_i += 2;
1223 break;
1225 default:
1226 // all others take one constant pool entry
1227 src_i++;
1228 dest_i++;
1229 break;
1230 }
1231 }
1232 copy_operands(from_cp, to_cp, CHECK);
1234 } // end copy_cp_to_impl()
1237 // Copy this constant pool's entry at from_i to the constant pool
1238 // to_cp's entry at to_i.
1239 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1240 constantPoolHandle to_cp, int to_i,
1241 TRAPS) {
1243 int tag = from_cp->tag_at(from_i).value();
1244 switch (tag) {
1245 case JVM_CONSTANT_Class:
1246 {
1247 Klass* k = from_cp->klass_at(from_i, CHECK);
1248 to_cp->klass_at_put(to_i, k);
1249 } break;
1251 case JVM_CONSTANT_ClassIndex:
1252 {
1253 jint ki = from_cp->klass_index_at(from_i);
1254 to_cp->klass_index_at_put(to_i, ki);
1255 } break;
1257 case JVM_CONSTANT_Double:
1258 {
1259 jdouble d = from_cp->double_at(from_i);
1260 to_cp->double_at_put(to_i, d);
1261 // double takes two constant pool entries so init second entry's tag
1262 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1263 } break;
1265 case JVM_CONSTANT_Fieldref:
1266 {
1267 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1268 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1269 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1270 } break;
1272 case JVM_CONSTANT_Float:
1273 {
1274 jfloat f = from_cp->float_at(from_i);
1275 to_cp->float_at_put(to_i, f);
1276 } break;
1278 case JVM_CONSTANT_Integer:
1279 {
1280 jint i = from_cp->int_at(from_i);
1281 to_cp->int_at_put(to_i, i);
1282 } break;
1284 case JVM_CONSTANT_InterfaceMethodref:
1285 {
1286 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1287 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1288 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1289 } break;
1291 case JVM_CONSTANT_Long:
1292 {
1293 jlong l = from_cp->long_at(from_i);
1294 to_cp->long_at_put(to_i, l);
1295 // long takes two constant pool entries so init second entry's tag
1296 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1297 } break;
1299 case JVM_CONSTANT_Methodref:
1300 {
1301 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1302 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1303 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1304 } break;
1306 case JVM_CONSTANT_NameAndType:
1307 {
1308 int name_ref_index = from_cp->name_ref_index_at(from_i);
1309 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1310 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1311 } break;
1313 case JVM_CONSTANT_StringIndex:
1314 {
1315 jint si = from_cp->string_index_at(from_i);
1316 to_cp->string_index_at_put(to_i, si);
1317 } break;
1319 case JVM_CONSTANT_UnresolvedClass:
1320 {
1321 // Can be resolved after checking tag, so check the slot first.
1322 CPSlot entry = from_cp->slot_at(from_i);
1323 if (entry.is_resolved()) {
1324 assert(entry.get_klass()->is_klass(), "must be");
1325 // Already resolved
1326 to_cp->klass_at_put(to_i, entry.get_klass());
1327 } else {
1328 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1329 }
1330 } break;
1332 case JVM_CONSTANT_UnresolvedClassInError:
1333 {
1334 Symbol* k = from_cp->unresolved_klass_at(from_i);
1335 to_cp->unresolved_klass_at_put(to_i, k);
1336 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1337 } break;
1340 case JVM_CONSTANT_String:
1341 {
1342 Symbol* s = from_cp->unresolved_string_at(from_i);
1343 to_cp->unresolved_string_at_put(to_i, s);
1344 } break;
1346 case JVM_CONSTANT_Utf8:
1347 {
1348 Symbol* s = from_cp->symbol_at(from_i);
1349 // Need to increase refcount, the old one will be thrown away and deferenced
1350 s->increment_refcount();
1351 to_cp->symbol_at_put(to_i, s);
1352 } break;
1354 case JVM_CONSTANT_MethodType:
1355 {
1356 jint k = from_cp->method_type_index_at(from_i);
1357 to_cp->method_type_index_at_put(to_i, k);
1358 } break;
1360 case JVM_CONSTANT_MethodHandle:
1361 {
1362 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1363 int k2 = from_cp->method_handle_index_at(from_i);
1364 to_cp->method_handle_index_at_put(to_i, k1, k2);
1365 } break;
1367 case JVM_CONSTANT_InvokeDynamic:
1368 {
1369 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1370 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1371 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1372 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1373 } break;
1375 // Invalid is used as the tag for the second constant pool entry
1376 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1377 // not be seen by itself.
1378 case JVM_CONSTANT_Invalid: // fall through
1380 default:
1381 {
1382 ShouldNotReachHere();
1383 } break;
1384 }
1385 } // end copy_entry_to()
1388 // Search constant pool search_cp for an entry that matches this
1389 // constant pool's entry at pattern_i. Returns the index of a
1390 // matching entry or zero (0) if there is no matching entry.
1391 int ConstantPool::find_matching_entry(int pattern_i,
1392 constantPoolHandle search_cp, TRAPS) {
1394 // index zero (0) is not used
1395 for (int i = 1; i < search_cp->length(); i++) {
1396 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1397 if (found) {
1398 return i;
1399 }
1400 }
1402 return 0; // entry not found; return unused index zero (0)
1403 } // end find_matching_entry()
1406 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1407 // cp2's bootstrap specifier at idx2.
1408 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) {
1409 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1410 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1411 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1413 if (!match) {
1414 return false;
1415 }
1416 int argc = operand_argument_count_at(idx1);
1417 if (argc == cp2->operand_argument_count_at(idx2)) {
1418 for (int j = 0; j < argc; j++) {
1419 k1 = operand_argument_index_at(idx1, j);
1420 k2 = cp2->operand_argument_index_at(idx2, j);
1421 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1422 if (!match) {
1423 return false;
1424 }
1425 }
1426 return true; // got through loop; all elements equal
1427 }
1428 return false;
1429 } // end compare_operand_to()
1431 // Search constant pool search_cp for a bootstrap specifier that matches
1432 // this constant pool's bootstrap specifier at pattern_i index.
1433 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1434 int ConstantPool::find_matching_operand(int pattern_i,
1435 constantPoolHandle search_cp, int search_len, TRAPS) {
1436 for (int i = 0; i < search_len; i++) {
1437 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1438 if (found) {
1439 return i;
1440 }
1441 }
1442 return -1; // bootstrap specifier not found; return unused index (-1)
1443 } // end find_matching_operand()
1446 #ifndef PRODUCT
1448 const char* ConstantPool::printable_name_at(int which) {
1450 constantTag tag = tag_at(which);
1452 if (tag.is_string()) {
1453 return string_at_noresolve(which);
1454 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1455 return klass_name_at(which)->as_C_string();
1456 } else if (tag.is_symbol()) {
1457 return symbol_at(which)->as_C_string();
1458 }
1459 return "";
1460 }
1462 #endif // PRODUCT
1465 // JVMTI GetConstantPool support
1467 // For debugging of constant pool
1468 const bool debug_cpool = false;
1470 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1472 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1473 const char* WARN_MSG = "Must not be such entry!";
1474 jint size = 0;
1475 u2 idx1, idx2;
1477 for (jint idx = 1; idx < cnt; idx++) {
1478 jint ent_size = 0;
1479 u1 tag = *bytes++;
1480 size++; // count tag
1482 printf("const #%03d, tag: %02d ", idx, tag);
1483 switch(tag) {
1484 case JVM_CONSTANT_Invalid: {
1485 printf("Invalid");
1486 break;
1487 }
1488 case JVM_CONSTANT_Unicode: {
1489 printf("Unicode %s", WARN_MSG);
1490 break;
1491 }
1492 case JVM_CONSTANT_Utf8: {
1493 u2 len = Bytes::get_Java_u2(bytes);
1494 char str[128];
1495 if (len > 127) {
1496 len = 127;
1497 }
1498 strncpy(str, (char *) (bytes+2), len);
1499 str[len] = '\0';
1500 printf("Utf8 \"%s\"", str);
1501 ent_size = 2 + len;
1502 break;
1503 }
1504 case JVM_CONSTANT_Integer: {
1505 u4 val = Bytes::get_Java_u4(bytes);
1506 printf("int %d", *(int *) &val);
1507 ent_size = 4;
1508 break;
1509 }
1510 case JVM_CONSTANT_Float: {
1511 u4 val = Bytes::get_Java_u4(bytes);
1512 printf("float %5.3ff", *(float *) &val);
1513 ent_size = 4;
1514 break;
1515 }
1516 case JVM_CONSTANT_Long: {
1517 u8 val = Bytes::get_Java_u8(bytes);
1518 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1519 ent_size = 8;
1520 idx++; // Long takes two cpool slots
1521 break;
1522 }
1523 case JVM_CONSTANT_Double: {
1524 u8 val = Bytes::get_Java_u8(bytes);
1525 printf("double %5.3fd", *(jdouble *)&val);
1526 ent_size = 8;
1527 idx++; // Double takes two cpool slots
1528 break;
1529 }
1530 case JVM_CONSTANT_Class: {
1531 idx1 = Bytes::get_Java_u2(bytes);
1532 printf("class #%03d", idx1);
1533 ent_size = 2;
1534 break;
1535 }
1536 case JVM_CONSTANT_String: {
1537 idx1 = Bytes::get_Java_u2(bytes);
1538 printf("String #%03d", idx1);
1539 ent_size = 2;
1540 break;
1541 }
1542 case JVM_CONSTANT_Fieldref: {
1543 idx1 = Bytes::get_Java_u2(bytes);
1544 idx2 = Bytes::get_Java_u2(bytes+2);
1545 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1546 ent_size = 4;
1547 break;
1548 }
1549 case JVM_CONSTANT_Methodref: {
1550 idx1 = Bytes::get_Java_u2(bytes);
1551 idx2 = Bytes::get_Java_u2(bytes+2);
1552 printf("Method #%03d, #%03d", idx1, idx2);
1553 ent_size = 4;
1554 break;
1555 }
1556 case JVM_CONSTANT_InterfaceMethodref: {
1557 idx1 = Bytes::get_Java_u2(bytes);
1558 idx2 = Bytes::get_Java_u2(bytes+2);
1559 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1560 ent_size = 4;
1561 break;
1562 }
1563 case JVM_CONSTANT_NameAndType: {
1564 idx1 = Bytes::get_Java_u2(bytes);
1565 idx2 = Bytes::get_Java_u2(bytes+2);
1566 printf("NameAndType #%03d, #%03d", idx1, idx2);
1567 ent_size = 4;
1568 break;
1569 }
1570 case JVM_CONSTANT_ClassIndex: {
1571 printf("ClassIndex %s", WARN_MSG);
1572 break;
1573 }
1574 case JVM_CONSTANT_UnresolvedClass: {
1575 printf("UnresolvedClass: %s", WARN_MSG);
1576 break;
1577 }
1578 case JVM_CONSTANT_UnresolvedClassInError: {
1579 printf("UnresolvedClassInErr: %s", WARN_MSG);
1580 break;
1581 }
1582 case JVM_CONSTANT_StringIndex: {
1583 printf("StringIndex: %s", WARN_MSG);
1584 break;
1585 }
1586 }
1587 printf(";\n");
1588 bytes += ent_size;
1589 size += ent_size;
1590 }
1591 printf("Cpool size: %d\n", size);
1592 fflush(0);
1593 return;
1594 } /* end print_cpool_bytes */
1597 // Returns size of constant pool entry.
1598 jint ConstantPool::cpool_entry_size(jint idx) {
1599 switch(tag_at(idx).value()) {
1600 case JVM_CONSTANT_Invalid:
1601 case JVM_CONSTANT_Unicode:
1602 return 1;
1604 case JVM_CONSTANT_Utf8:
1605 return 3 + symbol_at(idx)->utf8_length();
1607 case JVM_CONSTANT_Class:
1608 case JVM_CONSTANT_String:
1609 case JVM_CONSTANT_ClassIndex:
1610 case JVM_CONSTANT_UnresolvedClass:
1611 case JVM_CONSTANT_UnresolvedClassInError:
1612 case JVM_CONSTANT_StringIndex:
1613 case JVM_CONSTANT_MethodType:
1614 case JVM_CONSTANT_MethodTypeInError:
1615 return 3;
1617 case JVM_CONSTANT_MethodHandle:
1618 case JVM_CONSTANT_MethodHandleInError:
1619 return 4; //tag, ref_kind, ref_index
1621 case JVM_CONSTANT_Integer:
1622 case JVM_CONSTANT_Float:
1623 case JVM_CONSTANT_Fieldref:
1624 case JVM_CONSTANT_Methodref:
1625 case JVM_CONSTANT_InterfaceMethodref:
1626 case JVM_CONSTANT_NameAndType:
1627 return 5;
1629 case JVM_CONSTANT_InvokeDynamic:
1630 // u1 tag, u2 bsm, u2 nt
1631 return 5;
1633 case JVM_CONSTANT_Long:
1634 case JVM_CONSTANT_Double:
1635 return 9;
1636 }
1637 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1638 return 1;
1639 } /* end cpool_entry_size */
1642 // SymbolHashMap is used to find a constant pool index from a string.
1643 // This function fills in SymbolHashMaps, one for utf8s and one for
1644 // class names, returns size of the cpool raw bytes.
1645 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1646 SymbolHashMap *classmap) {
1647 jint size = 0;
1649 for (u2 idx = 1; idx < length(); idx++) {
1650 u2 tag = tag_at(idx).value();
1651 size += cpool_entry_size(idx);
1653 switch(tag) {
1654 case JVM_CONSTANT_Utf8: {
1655 Symbol* sym = symbol_at(idx);
1656 symmap->add_entry(sym, idx);
1657 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1658 break;
1659 }
1660 case JVM_CONSTANT_Class:
1661 case JVM_CONSTANT_UnresolvedClass:
1662 case JVM_CONSTANT_UnresolvedClassInError: {
1663 Symbol* sym = klass_name_at(idx);
1664 classmap->add_entry(sym, idx);
1665 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1666 break;
1667 }
1668 case JVM_CONSTANT_Long:
1669 case JVM_CONSTANT_Double: {
1670 idx++; // Both Long and Double take two cpool slots
1671 break;
1672 }
1673 }
1674 }
1675 return size;
1676 } /* end hash_utf8_entries_to */
1679 // Copy cpool bytes.
1680 // Returns:
1681 // 0, in case of OutOfMemoryError
1682 // -1, in case of internal error
1683 // > 0, count of the raw cpool bytes that have been copied
1684 int ConstantPool::copy_cpool_bytes(int cpool_size,
1685 SymbolHashMap* tbl,
1686 unsigned char *bytes) {
1687 u2 idx1, idx2;
1688 jint size = 0;
1689 jint cnt = length();
1690 unsigned char *start_bytes = bytes;
1692 for (jint idx = 1; idx < cnt; idx++) {
1693 u1 tag = tag_at(idx).value();
1694 jint ent_size = cpool_entry_size(idx);
1696 assert(size + ent_size <= cpool_size, "Size mismatch");
1698 *bytes = tag;
1699 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1700 switch(tag) {
1701 case JVM_CONSTANT_Invalid: {
1702 DBG(printf("JVM_CONSTANT_Invalid"));
1703 break;
1704 }
1705 case JVM_CONSTANT_Unicode: {
1706 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1707 DBG(printf("JVM_CONSTANT_Unicode"));
1708 break;
1709 }
1710 case JVM_CONSTANT_Utf8: {
1711 Symbol* sym = symbol_at(idx);
1712 char* str = sym->as_utf8();
1713 // Warning! It's crashing on x86 with len = sym->utf8_length()
1714 int len = (int) strlen(str);
1715 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1716 for (int i = 0; i < len; i++) {
1717 bytes[3+i] = (u1) str[i];
1718 }
1719 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1720 break;
1721 }
1722 case JVM_CONSTANT_Integer: {
1723 jint val = int_at(idx);
1724 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1725 break;
1726 }
1727 case JVM_CONSTANT_Float: {
1728 jfloat val = float_at(idx);
1729 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1730 break;
1731 }
1732 case JVM_CONSTANT_Long: {
1733 jlong val = long_at(idx);
1734 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1735 idx++; // Long takes two cpool slots
1736 break;
1737 }
1738 case JVM_CONSTANT_Double: {
1739 jdouble val = double_at(idx);
1740 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1741 idx++; // Double takes two cpool slots
1742 break;
1743 }
1744 case JVM_CONSTANT_Class:
1745 case JVM_CONSTANT_UnresolvedClass:
1746 case JVM_CONSTANT_UnresolvedClassInError: {
1747 *bytes = JVM_CONSTANT_Class;
1748 Symbol* sym = klass_name_at(idx);
1749 idx1 = tbl->symbol_to_value(sym);
1750 assert(idx1 != 0, "Have not found a hashtable entry");
1751 Bytes::put_Java_u2((address) (bytes+1), idx1);
1752 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1753 break;
1754 }
1755 case JVM_CONSTANT_String: {
1756 *bytes = JVM_CONSTANT_String;
1757 Symbol* sym = unresolved_string_at(idx);
1758 idx1 = tbl->symbol_to_value(sym);
1759 assert(idx1 != 0, "Have not found a hashtable entry");
1760 Bytes::put_Java_u2((address) (bytes+1), idx1);
1761 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1762 break;
1763 }
1764 case JVM_CONSTANT_Fieldref:
1765 case JVM_CONSTANT_Methodref:
1766 case JVM_CONSTANT_InterfaceMethodref: {
1767 idx1 = uncached_klass_ref_index_at(idx);
1768 idx2 = uncached_name_and_type_ref_index_at(idx);
1769 Bytes::put_Java_u2((address) (bytes+1), idx1);
1770 Bytes::put_Java_u2((address) (bytes+3), idx2);
1771 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1772 break;
1773 }
1774 case JVM_CONSTANT_NameAndType: {
1775 idx1 = name_ref_index_at(idx);
1776 idx2 = signature_ref_index_at(idx);
1777 Bytes::put_Java_u2((address) (bytes+1), idx1);
1778 Bytes::put_Java_u2((address) (bytes+3), idx2);
1779 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1780 break;
1781 }
1782 case JVM_CONSTANT_ClassIndex: {
1783 *bytes = JVM_CONSTANT_Class;
1784 idx1 = klass_index_at(idx);
1785 Bytes::put_Java_u2((address) (bytes+1), idx1);
1786 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1787 break;
1788 }
1789 case JVM_CONSTANT_StringIndex: {
1790 *bytes = JVM_CONSTANT_String;
1791 idx1 = string_index_at(idx);
1792 Bytes::put_Java_u2((address) (bytes+1), idx1);
1793 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1794 break;
1795 }
1796 case JVM_CONSTANT_MethodHandle:
1797 case JVM_CONSTANT_MethodHandleInError: {
1798 *bytes = JVM_CONSTANT_MethodHandle;
1799 int kind = method_handle_ref_kind_at_error_ok(idx);
1800 idx1 = method_handle_index_at_error_ok(idx);
1801 *(bytes+1) = (unsigned char) kind;
1802 Bytes::put_Java_u2((address) (bytes+2), idx1);
1803 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1804 break;
1805 }
1806 case JVM_CONSTANT_MethodType:
1807 case JVM_CONSTANT_MethodTypeInError: {
1808 *bytes = JVM_CONSTANT_MethodType;
1809 idx1 = method_type_index_at_error_ok(idx);
1810 Bytes::put_Java_u2((address) (bytes+1), idx1);
1811 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1812 break;
1813 }
1814 case JVM_CONSTANT_InvokeDynamic: {
1815 *bytes = tag;
1816 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1817 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1818 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1819 Bytes::put_Java_u2((address) (bytes+1), idx1);
1820 Bytes::put_Java_u2((address) (bytes+3), idx2);
1821 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1822 break;
1823 }
1824 }
1825 DBG(printf("\n"));
1826 bytes += ent_size;
1827 size += ent_size;
1828 }
1829 assert(size == cpool_size, "Size mismatch");
1831 // Keep temorarily for debugging until it's stable.
1832 DBG(print_cpool_bytes(cnt, start_bytes));
1833 return (int)(bytes - start_bytes);
1834 } /* end copy_cpool_bytes */
1836 #undef DBG
1839 void ConstantPool::set_on_stack(const bool value) {
1840 if (value) {
1841 _flags |= _on_stack;
1842 } else {
1843 _flags &= ~_on_stack;
1844 }
1845 if (value) MetadataOnStackMark::record(this);
1846 }
1848 // JSR 292 support for patching constant pool oops after the class is linked and
1849 // the oop array for resolved references are created.
1850 // We can't do this during classfile parsing, which is how the other indexes are
1851 // patched. The other patches are applied early for some error checking
1852 // so only defer the pseudo_strings.
1853 void ConstantPool::patch_resolved_references(
1854 GrowableArray<Handle>* cp_patches) {
1855 assert(EnableInvokeDynamic, "");
1856 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1857 Handle patch = cp_patches->at(index);
1858 if (patch.not_null()) {
1859 assert (tag_at(index).is_string(), "should only be string left");
1860 // Patching a string means pre-resolving it.
1861 // The spelling in the constant pool is ignored.
1862 // The constant reference may be any object whatever.
1863 // If it is not a real interned string, the constant is referred
1864 // to as a "pseudo-string", and must be presented to the CP
1865 // explicitly, because it may require scavenging.
1866 int obj_index = cp_to_object_index(index);
1867 pseudo_string_at_put(index, obj_index, patch());
1868 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1869 }
1870 }
1871 #ifdef ASSERT
1872 // Ensure that all the patches have been used.
1873 for (int index = 0; index < cp_patches->length(); index++) {
1874 assert(cp_patches->at(index).is_null(),
1875 err_msg("Unused constant pool patch at %d in class file %s",
1876 index,
1877 pool_holder()->external_name()));
1878 }
1879 #endif // ASSERT
1880 }
1882 #ifndef PRODUCT
1884 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1885 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1886 guarantee(obj->is_constantPool(), "object must be constant pool");
1887 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1888 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1890 for (int i = 0; i< cp->length(); i++) {
1891 if (cp->tag_at(i).is_unresolved_klass()) {
1892 // This will force loading of the class
1893 Klass* klass = cp->klass_at(i, CHECK);
1894 if (klass->oop_is_instance()) {
1895 // Force initialization of class
1896 InstanceKlass::cast(klass)->initialize(CHECK);
1897 }
1898 }
1899 }
1900 }
1902 #endif
1905 // Printing
1907 void ConstantPool::print_on(outputStream* st) const {
1908 EXCEPTION_MARK;
1909 assert(is_constantPool(), "must be constantPool");
1910 st->print_cr(internal_name());
1911 if (flags() != 0) {
1912 st->print(" - flags: 0x%x", flags());
1913 if (has_preresolution()) st->print(" has_preresolution");
1914 if (on_stack()) st->print(" on_stack");
1915 st->cr();
1916 }
1917 if (pool_holder() != NULL) {
1918 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
1919 }
1920 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
1921 st->print_cr(" - resolved_references: " INTPTR_FORMAT, (void *)resolved_references());
1922 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
1924 for (int index = 1; index < length(); index++) { // Index 0 is unused
1925 ((ConstantPool*)this)->print_entry_on(index, st);
1926 switch (tag_at(index).value()) {
1927 case JVM_CONSTANT_Long :
1928 case JVM_CONSTANT_Double :
1929 index++; // Skip entry following eigth-byte constant
1930 }
1932 }
1933 st->cr();
1934 }
1936 // Print one constant pool entry
1937 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1938 EXCEPTION_MARK;
1939 st->print(" - %3d : ", index);
1940 tag_at(index).print_on(st);
1941 st->print(" : ");
1942 switch (tag_at(index).value()) {
1943 case JVM_CONSTANT_Class :
1944 { Klass* k = klass_at(index, CATCH);
1945 guarantee(k != NULL, "need klass");
1946 k->print_value_on(st);
1947 st->print(" {0x%lx}", (address)k);
1948 }
1949 break;
1950 case JVM_CONSTANT_Fieldref :
1951 case JVM_CONSTANT_Methodref :
1952 case JVM_CONSTANT_InterfaceMethodref :
1953 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1954 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1955 break;
1956 case JVM_CONSTANT_String :
1957 if (is_pseudo_string_at(index)) {
1958 oop anObj = pseudo_string_at(index);
1959 anObj->print_value_on(st);
1960 st->print(" {0x%lx}", (address)anObj);
1961 } else {
1962 unresolved_string_at(index)->print_value_on(st);
1963 }
1964 break;
1965 case JVM_CONSTANT_Integer :
1966 st->print("%d", int_at(index));
1967 break;
1968 case JVM_CONSTANT_Float :
1969 st->print("%f", float_at(index));
1970 break;
1971 case JVM_CONSTANT_Long :
1972 st->print_jlong(long_at(index));
1973 break;
1974 case JVM_CONSTANT_Double :
1975 st->print("%lf", double_at(index));
1976 break;
1977 case JVM_CONSTANT_NameAndType :
1978 st->print("name_index=%d", name_ref_index_at(index));
1979 st->print(" signature_index=%d", signature_ref_index_at(index));
1980 break;
1981 case JVM_CONSTANT_Utf8 :
1982 symbol_at(index)->print_value_on(st);
1983 break;
1984 case JVM_CONSTANT_UnresolvedClass : // fall-through
1985 case JVM_CONSTANT_UnresolvedClassInError: {
1986 // unresolved_klass_at requires lock or safe world.
1987 CPSlot entry = slot_at(index);
1988 if (entry.is_resolved()) {
1989 entry.get_klass()->print_value_on(st);
1990 } else {
1991 entry.get_symbol()->print_value_on(st);
1992 }
1993 }
1994 break;
1995 case JVM_CONSTANT_MethodHandle :
1996 case JVM_CONSTANT_MethodHandleInError :
1997 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index));
1998 st->print(" ref_index=%d", method_handle_index_at_error_ok(index));
1999 break;
2000 case JVM_CONSTANT_MethodType :
2001 case JVM_CONSTANT_MethodTypeInError :
2002 st->print("signature_index=%d", method_type_index_at_error_ok(index));
2003 break;
2004 case JVM_CONSTANT_InvokeDynamic :
2005 {
2006 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
2007 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
2008 int argc = invoke_dynamic_argument_count_at(index);
2009 if (argc > 0) {
2010 for (int arg_i = 0; arg_i < argc; arg_i++) {
2011 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2012 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2013 }
2014 st->print("}");
2015 }
2016 }
2017 break;
2018 default:
2019 ShouldNotReachHere();
2020 break;
2021 }
2022 st->cr();
2023 }
2025 void ConstantPool::print_value_on(outputStream* st) const {
2026 assert(is_constantPool(), "must be constantPool");
2027 st->print("constant pool [%d]", length());
2028 if (has_preresolution()) st->print("/preresolution");
2029 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2030 print_address_on(st);
2031 st->print(" for ");
2032 pool_holder()->print_value_on(st);
2033 if (pool_holder() != NULL) {
2034 bool extra = (pool_holder()->constants() != this);
2035 if (extra) st->print(" (extra)");
2036 }
2037 if (cache() != NULL) {
2038 st->print(" cache=" PTR_FORMAT, cache());
2039 }
2040 }
2042 #if INCLUDE_SERVICES
2043 // Size Statistics
2044 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2045 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2046 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2047 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2048 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2049 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2051 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2052 sz->_cp_refmap_bytes;
2053 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2054 }
2055 #endif // INCLUDE_SERVICES
2057 // Verification
2059 void ConstantPool::verify_on(outputStream* st) {
2060 guarantee(is_constantPool(), "object must be constant pool");
2061 for (int i = 0; i< length(); i++) {
2062 constantTag tag = tag_at(i);
2063 CPSlot entry = slot_at(i);
2064 if (tag.is_klass()) {
2065 if (entry.is_resolved()) {
2066 guarantee(entry.get_klass()->is_klass(), "should be klass");
2067 }
2068 } else if (tag.is_unresolved_klass()) {
2069 if (entry.is_resolved()) {
2070 guarantee(entry.get_klass()->is_klass(), "should be klass");
2071 }
2072 } else if (tag.is_symbol()) {
2073 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2074 } else if (tag.is_string()) {
2075 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2076 }
2077 }
2078 if (cache() != NULL) {
2079 // Note: cache() can be NULL before a class is completely setup or
2080 // in temporary constant pools used during constant pool merging
2081 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2082 }
2083 if (pool_holder() != NULL) {
2084 // Note: pool_holder() can be NULL in temporary constant pools
2085 // used during constant pool merging
2086 guarantee(pool_holder()->is_klass(), "should be klass");
2087 }
2088 }
2091 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2092 char *str = sym->as_utf8();
2093 unsigned int hash = compute_hash(str, sym->utf8_length());
2094 unsigned int index = hash % table_size();
2096 // check if already in map
2097 // we prefer the first entry since it is more likely to be what was used in
2098 // the class file
2099 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2100 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2101 if (en->hash() == hash && en->symbol() == sym) {
2102 return; // already there
2103 }
2104 }
2106 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2107 entry->set_next(bucket(index));
2108 _buckets[index].set_entry(entry);
2109 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2110 }
2112 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2113 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2114 char *str = sym->as_utf8();
2115 int len = sym->utf8_length();
2116 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2117 unsigned int index = hash % table_size();
2118 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2119 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2120 if (en->hash() == hash && en->symbol() == sym) {
2121 return en;
2122 }
2123 }
2124 return NULL;
2125 }