Wed, 03 Oct 2012 20:31:41 +0200
8000351: Tenuring threshold should be unsigned
Summary: Change the flags and variables related to tenuring threshold to be unsigned
Reviewed-by: jmasa, johnc
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
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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).
14 *
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23 */
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "memory/metadataFactory.hpp"
33 #include "memory/oopFactory.hpp"
34 #include "oops/constantPool.hpp"
35 #include "oops/instanceKlass.hpp"
36 #include "oops/objArrayKlass.hpp"
37 #include "prims/jvmtiRedefineClasses.hpp"
38 #include "runtime/fieldType.hpp"
39 #include "runtime/init.hpp"
40 #include "runtime/javaCalls.hpp"
41 #include "runtime/signature.hpp"
42 #include "runtime/vframe.hpp"
44 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
45 // Tags are RW but comment below applies to tags also.
46 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
48 int size = ConstantPool::size(length);
50 // CDS considerations:
51 // Allocate read-write but may be able to move to read-only at dumping time
52 // if all the klasses are resolved. The only other field that is writable is
53 // the resolved_references array, which is recreated at startup time.
54 // But that could be moved to InstanceKlass (although a pain to access from
55 // assembly code). Maybe it could be moved to the cpCache which is RW.
56 return new (loader_data, size, false, THREAD) ConstantPool(tags);
57 }
59 ConstantPool::ConstantPool(Array<u1>* tags) {
60 set_length(tags->length());
61 set_tags(NULL);
62 set_cache(NULL);
63 set_reference_map(NULL);
64 set_resolved_references(NULL);
65 set_operands(NULL);
66 set_pool_holder(NULL);
67 set_flags(0);
68 // only set to non-zero if constant pool is merged by RedefineClasses
69 set_orig_length(0);
70 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
71 // all fields are initialized; needed for GC
72 set_on_stack(false);
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 void ConstantPool::set_flag_at(FlagBit fb) {
104 const int MAX_STATE_CHANGES = 2;
105 for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) {
106 int oflags = _flags;
107 int nflags = oflags | (1 << (int)fb);
108 if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags)
109 return;
110 }
111 assert(false, "failed to cmpxchg flags");
112 _flags |= (1 << (int)fb); // better than nothing
113 }
115 objArrayOop ConstantPool::resolved_references() const {
116 return (objArrayOop)JNIHandles::resolve(_resolved_references);
117 }
119 // Create resolved_references array and mapping array for original cp indexes
120 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
121 // to map it back for resolving and some unlikely miscellaneous uses.
122 // The objects created by invokedynamic are appended to this list.
123 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
124 intStack reference_map,
125 int constant_pool_map_length,
126 TRAPS) {
127 // Initialized the resolved object cache.
128 int map_length = reference_map.length();
129 if (map_length > 0) {
130 // Only need mapping back to constant pool entries. The map isn't used for
131 // invokedynamic resolved_reference entries. The constant pool cache index
132 // has the mapping back to both the constant pool and to the resolved
133 // reference index.
134 if (constant_pool_map_length > 0) {
135 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK);
137 for (int i = 0; i < constant_pool_map_length; i++) {
138 int x = reference_map.at(i);
139 assert(x == (int)(jushort) x, "klass index is too big");
140 om->at_put(i, (jushort)x);
141 }
142 set_reference_map(om);
143 }
145 // Create Java array for holding resolved strings, methodHandles,
146 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
147 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
148 Handle refs_handle (THREAD, (oop)stom); // must handleize.
149 set_resolved_references(loader_data->add_handle(refs_handle));
150 }
151 }
153 // CDS support. Create a new resolved_references array.
154 void ConstantPool::restore_unshareable_info(TRAPS) {
156 // restore the C++ vtable from the shared archive
157 restore_vtable();
159 if (SystemDictionary::Object_klass_loaded()) {
160 // Recreate the object array and add to ClassLoaderData.
161 int map_length = resolved_reference_length();
162 if (map_length > 0) {
163 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
164 Handle refs_handle (THREAD, (oop)stom); // must handleize.
166 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
167 set_resolved_references(loader_data->add_handle(refs_handle));
168 }
170 // Also need to recreate the mutex. Make sure this matches the constructor
171 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
172 }
173 }
175 void ConstantPool::remove_unshareable_info() {
176 // Resolved references are not in the shared archive.
177 // Save the length for restoration. It is not necessarily the same length
178 // as reference_map.length() if invokedynamic is saved.
179 set_resolved_reference_length(
180 resolved_references() != NULL ? resolved_references()->length() : 0);
181 set_resolved_references(NULL);
182 set_lock(NULL);
183 }
185 int ConstantPool::cp_to_object_index(int cp_index) {
186 // this is harder don't do this so much.
187 for (int i = 0; i< reference_map()->length(); i++) {
188 if (reference_map()->at(i) == cp_index) return i;
189 // Zero entry is divider between constant pool indices for strings,
190 // method handles and method types. After that the index is a constant
191 // pool cache index for invokedynamic. Stop when zero (which can never
192 // be a constant pool index)
193 if (reference_map()->at(i) == 0) break;
194 }
195 // We might not find the index.
196 return _no_index_sentinel;
197 }
199 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
200 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
201 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
202 // tag is not updated atomicly.
204 CPSlot entry = this_oop->slot_at(which);
205 if (entry.is_resolved()) {
206 assert(entry.get_klass()->is_klass(), "must be");
207 // Already resolved - return entry.
208 return entry.get_klass();
209 }
211 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
212 // already has updated the object
213 assert(THREAD->is_Java_thread(), "must be a Java thread");
214 bool do_resolve = false;
215 bool in_error = false;
217 // Create a handle for the mirror. This will preserve the resolved class
218 // until the loader_data is registered.
219 Handle mirror_handle;
221 Symbol* name = NULL;
222 Handle loader;
223 { MonitorLockerEx ml(this_oop->lock());
225 if (this_oop->tag_at(which).is_unresolved_klass()) {
226 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
227 in_error = true;
228 } else {
229 do_resolve = true;
230 name = this_oop->unresolved_klass_at(which);
231 loader = Handle(THREAD, InstanceKlass::cast(this_oop->pool_holder())->class_loader());
232 }
233 }
234 } // unlocking constantPool
237 // The original attempt to resolve this constant pool entry failed so find the
238 // original error and throw it again (JVMS 5.4.3).
239 if (in_error) {
240 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
241 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
242 ResourceMark rm;
243 // exception text will be the class name
244 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
245 THROW_MSG_0(error, className);
246 }
248 if (do_resolve) {
249 // this_oop must be unlocked during resolve_or_fail
250 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
251 Handle h_prot (THREAD, protection_domain);
252 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
253 KlassHandle k;
254 if (!HAS_PENDING_EXCEPTION) {
255 k = KlassHandle(THREAD, k_oop);
256 // preserve the resolved klass.
257 mirror_handle = Handle(THREAD, k_oop->java_mirror());
258 // Do access check for klasses
259 verify_constant_pool_resolve(this_oop, k, THREAD);
260 }
262 // Failed to resolve class. We must record the errors so that subsequent attempts
263 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
264 if (HAS_PENDING_EXCEPTION) {
265 ResourceMark rm;
266 Symbol* error = PENDING_EXCEPTION->klass()->name();
268 bool throw_orig_error = false;
269 {
270 MonitorLockerEx ml(this_oop->lock());
272 // some other thread has beaten us and has resolved the class.
273 if (this_oop->tag_at(which).is_klass()) {
274 CLEAR_PENDING_EXCEPTION;
275 entry = this_oop->resolved_klass_at(which);
276 return entry.get_klass();
277 }
279 if (!PENDING_EXCEPTION->
280 is_a(SystemDictionary::LinkageError_klass())) {
281 // Just throw the exception and don't prevent these classes from
282 // being loaded due to virtual machine errors like StackOverflow
283 // and OutOfMemoryError, etc, or if the thread was hit by stop()
284 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
285 }
286 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
287 SystemDictionary::add_resolution_error(this_oop, which, error);
288 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
289 } else {
290 // some other thread has put the class in error state.
291 error = SystemDictionary::find_resolution_error(this_oop, which);
292 assert(error != NULL, "checking");
293 throw_orig_error = true;
294 }
295 } // unlocked
297 if (throw_orig_error) {
298 CLEAR_PENDING_EXCEPTION;
299 ResourceMark rm;
300 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
301 THROW_MSG_0(error, className);
302 }
304 return 0;
305 }
307 if (TraceClassResolution && !k()->oop_is_array()) {
308 // skip resolving the constant pool so that this code get's
309 // called the next time some bytecodes refer to this class.
310 ResourceMark rm;
311 int line_number = -1;
312 const char * source_file = NULL;
313 if (JavaThread::current()->has_last_Java_frame()) {
314 // try to identify the method which called this function.
315 vframeStream vfst(JavaThread::current());
316 if (!vfst.at_end()) {
317 line_number = vfst.method()->line_number_from_bci(vfst.bci());
318 Symbol* s = InstanceKlass::cast(vfst.method()->method_holder())->source_file_name();
319 if (s != NULL) {
320 source_file = s->as_C_string();
321 }
322 }
323 }
324 if (k() != this_oop->pool_holder()) {
325 // only print something if the classes are different
326 if (source_file != NULL) {
327 tty->print("RESOLVE %s %s %s:%d\n",
328 InstanceKlass::cast(this_oop->pool_holder())->external_name(),
329 InstanceKlass::cast(k())->external_name(), source_file, line_number);
330 } else {
331 tty->print("RESOLVE %s %s\n",
332 InstanceKlass::cast(this_oop->pool_holder())->external_name(),
333 InstanceKlass::cast(k())->external_name());
334 }
335 }
336 return k();
337 } else {
338 MonitorLockerEx ml(this_oop->lock());
339 // Only updated constant pool - if it is resolved.
340 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
341 if (do_resolve) {
342 ClassLoaderData* this_key = InstanceKlass::cast(this_oop->pool_holder())->class_loader_data();
343 if (!this_key->is_the_null_class_loader_data()) {
344 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
345 }
346 this_oop->klass_at_put(which, k());
347 }
348 }
349 }
351 entry = this_oop->resolved_klass_at(which);
352 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
353 return entry.get_klass();
354 }
357 // Does not update ConstantPool* - to avoid any exception throwing. Used
358 // by compiler and exception handling. Also used to avoid classloads for
359 // instanceof operations. Returns NULL if the class has not been loaded or
360 // if the verification of constant pool failed
361 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
362 CPSlot entry = this_oop->slot_at(which);
363 if (entry.is_resolved()) {
364 assert(entry.get_klass()->is_klass(), "must be");
365 return entry.get_klass();
366 } else {
367 assert(entry.is_unresolved(), "must be either symbol or klass");
368 Thread *thread = Thread::current();
369 Symbol* name = entry.get_symbol();
370 oop loader = InstanceKlass::cast(this_oop->pool_holder())->class_loader();
371 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
372 Handle h_prot (thread, protection_domain);
373 Handle h_loader (thread, loader);
374 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
376 if (k != NULL) {
377 // Make sure that resolving is legal
378 EXCEPTION_MARK;
379 KlassHandle klass(THREAD, k);
380 // return NULL if verification fails
381 verify_constant_pool_resolve(this_oop, klass, THREAD);
382 if (HAS_PENDING_EXCEPTION) {
383 CLEAR_PENDING_EXCEPTION;
384 return NULL;
385 }
386 return klass();
387 } else {
388 return k;
389 }
390 }
391 }
394 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
395 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
396 }
399 // This is an interface for the compiler that allows accessing non-resolved entries
400 // in the constant pool - but still performs the validations tests. Must be used
401 // in a pre-parse of the compiler - to determine what it can do and not do.
402 // Note: We cannot update the ConstantPool from the vm_thread.
403 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
404 int which = this_oop->klass_ref_index_at(index);
405 CPSlot entry = this_oop->slot_at(which);
406 if (entry.is_resolved()) {
407 assert(entry.get_klass()->is_klass(), "must be");
408 return entry.get_klass();
409 } else {
410 assert(entry.is_unresolved(), "must be either symbol or klass");
411 Symbol* name = entry.get_symbol();
412 oop loader = InstanceKlass::cast(this_oop->pool_holder())->class_loader();
413 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
414 Handle h_loader(THREAD, loader);
415 Handle h_prot (THREAD, protection_domain);
416 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
418 // Do access check for klasses
419 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
420 return k();
421 }
422 }
425 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
426 int which) {
427 if (cpool->cache() == NULL) return NULL; // nothing to load yet
428 int cache_index = decode_cpcache_index(which, true);
429 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
430 // FIXME: should be an assert
431 if (PrintMiscellaneous && (Verbose||WizardMode)) {
432 tty->print_cr("bad operand %d in:", which); cpool->print();
433 }
434 return NULL;
435 }
436 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
437 return e->method_if_resolved(cpool);
438 }
441 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
442 if (cpool->cache() == NULL) return false; // nothing to load yet
443 int cache_index = decode_cpcache_index(which, true);
444 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
445 return e->has_appendix();
446 }
449 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
450 if (cpool->cache() == NULL) return NULL; // nothing to load yet
451 int cache_index = decode_cpcache_index(which, true);
452 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
453 return e->appendix_if_resolved(cpool);
454 }
457 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
458 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
459 return symbol_at(name_index);
460 }
463 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
464 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
465 return symbol_at(signature_index);
466 }
469 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
470 int i = which;
471 if (!uncached && cache() != NULL) {
472 if (ConstantPool::is_invokedynamic_index(which)) {
473 // Invokedynamic index is index into resolved_references
474 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
475 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
476 assert(tag_at(pool_index).is_name_and_type(), "");
477 return pool_index;
478 }
479 // change byte-ordering and go via cache
480 i = remap_instruction_operand_from_cache(which);
481 } else {
482 if (tag_at(which).is_invoke_dynamic()) {
483 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
484 assert(tag_at(pool_index).is_name_and_type(), "");
485 return pool_index;
486 }
487 }
488 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
489 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
490 jint ref_index = *int_at_addr(i);
491 return extract_high_short_from_int(ref_index);
492 }
495 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
496 guarantee(!ConstantPool::is_invokedynamic_index(which),
497 "an invokedynamic instruction does not have a klass");
498 int i = which;
499 if (!uncached && cache() != NULL) {
500 // change byte-ordering and go via cache
501 i = remap_instruction_operand_from_cache(which);
502 }
503 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
504 jint ref_index = *int_at_addr(i);
505 return extract_low_short_from_int(ref_index);
506 }
510 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
511 int cpc_index = operand;
512 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
513 assert((int)(u2)cpc_index == cpc_index, "clean u2");
514 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
515 return member_index;
516 }
519 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
520 if (k->oop_is_instance() || k->oop_is_objArray()) {
521 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
522 Klass* elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass();
523 KlassHandle element (THREAD, elem_oop);
525 // The element type could be a typeArray - we only need the access check if it is
526 // an reference to another class
527 if (element->oop_is_instance()) {
528 LinkResolver::check_klass_accessability(holder, element, CHECK);
529 }
530 }
531 }
534 int ConstantPool::name_ref_index_at(int which_nt) {
535 jint ref_index = name_and_type_at(which_nt);
536 return extract_low_short_from_int(ref_index);
537 }
540 int ConstantPool::signature_ref_index_at(int which_nt) {
541 jint ref_index = name_and_type_at(which_nt);
542 return extract_high_short_from_int(ref_index);
543 }
546 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
547 return klass_at(klass_ref_index_at(which), CHECK_NULL);
548 }
551 Symbol* ConstantPool::klass_name_at(int which) {
552 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
553 "Corrupted constant pool");
554 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
555 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
556 // tag is not updated atomicly.
557 CPSlot entry = slot_at(which);
558 if (entry.is_resolved()) {
559 // Already resolved - return entry's name.
560 assert(entry.get_klass()->is_klass(), "must be");
561 return entry.get_klass()->name();
562 } else {
563 assert(entry.is_unresolved(), "must be either symbol or klass");
564 return entry.get_symbol();
565 }
566 }
568 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
569 jint ref_index = klass_ref_index_at(which);
570 return klass_at_noresolve(ref_index);
571 }
573 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
574 jint ref_index = uncached_klass_ref_index_at(which);
575 return klass_at_noresolve(ref_index);
576 }
578 char* ConstantPool::string_at_noresolve(int which) {
579 Symbol* s = unresolved_string_at(which);
580 if (s == NULL) {
581 return (char*)"<pseudo-string>";
582 } else {
583 return unresolved_string_at(which)->as_C_string();
584 }
585 }
587 BasicType ConstantPool::basic_type_for_signature_at(int which) {
588 return FieldType::basic_type(symbol_at(which));
589 }
592 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
593 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
594 if (this_oop->tag_at(index).is_string()) {
595 this_oop->string_at(index, CHECK);
596 }
597 }
598 }
600 // Resolve all the classes in the constant pool. If they are all resolved,
601 // the constant pool is read-only. Enhancement: allocate cp entries to
602 // another metaspace, and copy to read-only or read-write space if this
603 // bit is set.
604 bool ConstantPool::resolve_class_constants(TRAPS) {
605 constantPoolHandle cp(THREAD, this);
606 for (int index = 1; index < length(); index++) { // Index 0 is unused
607 if (tag_at(index).is_unresolved_klass() &&
608 klass_at_if_loaded(cp, index) == NULL) {
609 return false;
610 }
611 }
612 // set_preresolution(); or some bit for future use
613 return true;
614 }
616 // If resolution for MethodHandle or MethodType fails, save the exception
617 // in the resolution error table, so that the same exception is thrown again.
618 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
619 int tag, TRAPS) {
620 ResourceMark rm;
621 Symbol* error = PENDING_EXCEPTION->klass()->name();
622 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag.
624 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
625 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
627 if (!PENDING_EXCEPTION->
628 is_a(SystemDictionary::LinkageError_klass())) {
629 // Just throw the exception and don't prevent these classes from
630 // being loaded due to virtual machine errors like StackOverflow
631 // and OutOfMemoryError, etc, or if the thread was hit by stop()
632 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
634 } else if (this_oop->tag_at(which).value() != error_tag) {
635 SystemDictionary::add_resolution_error(this_oop, which, error);
636 this_oop->tag_at_put(which, error_tag);
637 } else {
638 // some other thread has put the class in error state.
639 error = SystemDictionary::find_resolution_error(this_oop, which);
640 assert(error != NULL, "checking");
641 CLEAR_PENDING_EXCEPTION;
642 THROW_MSG(error, "");
643 }
644 }
647 // Called to resolve constants in the constant pool and return an oop.
648 // Some constant pool entries cache their resolved oop. This is also
649 // called to create oops from constants to use in arguments for invokedynamic
650 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
651 oop result_oop = NULL;
652 Handle throw_exception;
654 if (cache_index == _possible_index_sentinel) {
655 // It is possible that this constant is one which is cached in the objects.
656 // We'll do a linear search. This should be OK because this usage is rare.
657 assert(index > 0, "valid index");
658 cache_index = this_oop->cp_to_object_index(index);
659 }
660 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
661 assert(index == _no_index_sentinel || index >= 0, "");
663 if (cache_index >= 0) {
664 result_oop = this_oop->resolved_references()->obj_at(cache_index);
665 if (result_oop != NULL) {
666 return result_oop;
667 // That was easy...
668 }
669 index = this_oop->object_to_cp_index(cache_index);
670 }
672 jvalue prim_value; // temp used only in a few cases below
674 int tag_value = this_oop->tag_at(index).value();
676 switch (tag_value) {
678 case JVM_CONSTANT_UnresolvedClass:
679 case JVM_CONSTANT_UnresolvedClassInError:
680 case JVM_CONSTANT_Class:
681 {
682 assert(cache_index == _no_index_sentinel, "should not have been set");
683 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
684 // ldc wants the java mirror.
685 result_oop = resolved->java_mirror();
686 break;
687 }
689 case JVM_CONSTANT_String:
690 assert(cache_index != _no_index_sentinel, "should have been set");
691 if (this_oop->is_pseudo_string_at(index)) {
692 result_oop = this_oop->pseudo_string_at(index, cache_index);
693 break;
694 }
695 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
696 break;
698 case JVM_CONSTANT_Object:
699 result_oop = this_oop->object_at(index);
700 break;
702 case JVM_CONSTANT_MethodHandleInError:
703 case JVM_CONSTANT_MethodTypeInError:
704 {
705 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
706 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
707 ResourceMark rm;
708 THROW_MSG_0(error, "");
709 break;
710 }
712 case JVM_CONSTANT_MethodHandle:
713 {
714 int ref_kind = this_oop->method_handle_ref_kind_at(index);
715 int callee_index = this_oop->method_handle_klass_index_at(index);
716 Symbol* name = this_oop->method_handle_name_ref_at(index);
717 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
718 if (PrintMiscellaneous)
719 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
720 ref_kind, index, this_oop->method_handle_index_at(index),
721 callee_index, name->as_C_string(), signature->as_C_string());
722 KlassHandle callee;
723 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
724 callee = KlassHandle(THREAD, k);
725 }
726 KlassHandle klass(THREAD, this_oop->pool_holder());
727 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
728 callee, name, signature,
729 THREAD);
730 result_oop = value();
731 if (HAS_PENDING_EXCEPTION) {
732 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
733 }
734 break;
735 }
737 case JVM_CONSTANT_MethodType:
738 {
739 Symbol* signature = this_oop->method_type_signature_at(index);
740 if (PrintMiscellaneous)
741 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
742 index, this_oop->method_type_index_at(index),
743 signature->as_C_string());
744 KlassHandle klass(THREAD, this_oop->pool_holder());
745 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
746 result_oop = value();
747 if (HAS_PENDING_EXCEPTION) {
748 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
749 }
750 break;
751 }
753 case JVM_CONSTANT_Integer:
754 assert(cache_index == _no_index_sentinel, "should not have been set");
755 prim_value.i = this_oop->int_at(index);
756 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
757 break;
759 case JVM_CONSTANT_Float:
760 assert(cache_index == _no_index_sentinel, "should not have been set");
761 prim_value.f = this_oop->float_at(index);
762 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
763 break;
765 case JVM_CONSTANT_Long:
766 assert(cache_index == _no_index_sentinel, "should not have been set");
767 prim_value.j = this_oop->long_at(index);
768 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
769 break;
771 case JVM_CONSTANT_Double:
772 assert(cache_index == _no_index_sentinel, "should not have been set");
773 prim_value.d = this_oop->double_at(index);
774 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
775 break;
777 default:
778 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
779 this_oop(), index, cache_index, tag_value) );
780 assert(false, "unexpected constant tag");
781 break;
782 }
784 if (cache_index >= 0) {
785 // Cache the oop here also.
786 Handle result_handle(THREAD, result_oop);
787 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this
788 oop result = this_oop->resolved_references()->obj_at(cache_index);
789 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
790 // The important thing here is that all threads pick up the same result.
791 // It doesn't matter which racing thread wins, as long as only one
792 // result is used by all threads, and all future queries.
793 // That result may be either a resolved constant or a failure exception.
794 if (result == NULL) {
795 this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
796 return result_handle();
797 } else {
798 // Return the winning thread's result. This can be different than
799 // result_handle() for MethodHandles.
800 return result;
801 }
802 } else {
803 return result_oop;
804 }
805 }
807 oop ConstantPool::uncached_string_at(int which, TRAPS) {
808 Symbol* sym = unresolved_string_at(which);
809 oop str = StringTable::intern(sym, CHECK_(NULL));
810 assert(java_lang_String::is_instance(str), "must be string");
811 return str;
812 }
815 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
816 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
818 Handle bsm;
819 int argc;
820 {
821 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
822 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
823 // It is accompanied by the optional arguments.
824 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
825 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
826 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
827 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
828 }
830 // Extract the optional static arguments.
831 argc = this_oop->invoke_dynamic_argument_count_at(index);
832 if (argc == 0) return bsm_oop;
834 bsm = Handle(THREAD, bsm_oop);
835 }
837 objArrayHandle info;
838 {
839 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
840 info = objArrayHandle(THREAD, info_oop);
841 }
843 info->obj_at_put(0, bsm());
844 for (int i = 0; i < argc; i++) {
845 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
846 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
847 info->obj_at_put(1+i, arg_oop);
848 }
850 return info();
851 }
853 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
854 // If the string has already been interned, this entry will be non-null
855 oop str = this_oop->resolved_references()->obj_at(obj_index);
856 if (str != NULL) return str;
858 Symbol* sym = this_oop->unresolved_string_at(which);
859 str = StringTable::intern(sym, CHECK_(NULL));
860 this_oop->string_at_put(which, obj_index, str);
861 assert(java_lang_String::is_instance(str), "must be string");
862 return str;
863 }
866 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
867 int which) {
868 // Names are interned, so we can compare Symbol*s directly
869 Symbol* cp_name = klass_name_at(which);
870 return (cp_name == k->name());
871 }
874 // Iterate over symbols and decrement ones which are Symbol*s.
875 // This is done during GC so do not need to lock constantPool unless we
876 // have per-thread safepoints.
877 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
878 // these symbols but didn't increment the reference count.
879 void ConstantPool::unreference_symbols() {
880 for (int index = 1; index < length(); index++) { // Index 0 is unused
881 constantTag tag = tag_at(index);
882 if (tag.is_symbol()) {
883 symbol_at(index)->decrement_refcount();
884 }
885 }
886 }
889 // Compare this constant pool's entry at index1 to the constant pool
890 // cp2's entry at index2.
891 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
892 int index2, TRAPS) {
894 jbyte t1 = tag_at(index1).value();
895 jbyte t2 = cp2->tag_at(index2).value();
898 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
899 // when comparing
900 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
901 t1 = JVM_CONSTANT_UnresolvedClass;
902 }
903 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
904 t2 = JVM_CONSTANT_UnresolvedClass;
905 }
907 if (t1 != t2) {
908 // Not the same entry type so there is nothing else to check. Note
909 // that this style of checking will consider resolved/unresolved
910 // class pairs as different.
911 // From the ConstantPool* API point of view, this is correct
912 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
913 // plays out in the context of ConstantPool* merging.
914 return false;
915 }
917 switch (t1) {
918 case JVM_CONSTANT_Class:
919 {
920 Klass* k1 = klass_at(index1, CHECK_false);
921 Klass* k2 = cp2->klass_at(index2, CHECK_false);
922 if (k1 == k2) {
923 return true;
924 }
925 } break;
927 case JVM_CONSTANT_ClassIndex:
928 {
929 int recur1 = klass_index_at(index1);
930 int recur2 = cp2->klass_index_at(index2);
931 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
932 if (match) {
933 return true;
934 }
935 } break;
937 case JVM_CONSTANT_Double:
938 {
939 jdouble d1 = double_at(index1);
940 jdouble d2 = cp2->double_at(index2);
941 if (d1 == d2) {
942 return true;
943 }
944 } break;
946 case JVM_CONSTANT_Fieldref:
947 case JVM_CONSTANT_InterfaceMethodref:
948 case JVM_CONSTANT_Methodref:
949 {
950 int recur1 = uncached_klass_ref_index_at(index1);
951 int recur2 = cp2->uncached_klass_ref_index_at(index2);
952 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
953 if (match) {
954 recur1 = uncached_name_and_type_ref_index_at(index1);
955 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
956 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
957 if (match) {
958 return true;
959 }
960 }
961 } break;
963 case JVM_CONSTANT_Float:
964 {
965 jfloat f1 = float_at(index1);
966 jfloat f2 = cp2->float_at(index2);
967 if (f1 == f2) {
968 return true;
969 }
970 } break;
972 case JVM_CONSTANT_Integer:
973 {
974 jint i1 = int_at(index1);
975 jint i2 = cp2->int_at(index2);
976 if (i1 == i2) {
977 return true;
978 }
979 } break;
981 case JVM_CONSTANT_Long:
982 {
983 jlong l1 = long_at(index1);
984 jlong l2 = cp2->long_at(index2);
985 if (l1 == l2) {
986 return true;
987 }
988 } break;
990 case JVM_CONSTANT_NameAndType:
991 {
992 int recur1 = name_ref_index_at(index1);
993 int recur2 = cp2->name_ref_index_at(index2);
994 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
995 if (match) {
996 recur1 = signature_ref_index_at(index1);
997 recur2 = cp2->signature_ref_index_at(index2);
998 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
999 if (match) {
1000 return true;
1001 }
1002 }
1003 } break;
1005 case JVM_CONSTANT_StringIndex:
1006 {
1007 int recur1 = string_index_at(index1);
1008 int recur2 = cp2->string_index_at(index2);
1009 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1010 if (match) {
1011 return true;
1012 }
1013 } break;
1015 case JVM_CONSTANT_UnresolvedClass:
1016 {
1017 Symbol* k1 = unresolved_klass_at(index1);
1018 Symbol* k2 = cp2->unresolved_klass_at(index2);
1019 if (k1 == k2) {
1020 return true;
1021 }
1022 } break;
1024 case JVM_CONSTANT_MethodType:
1025 {
1026 int k1 = method_type_index_at(index1);
1027 int k2 = cp2->method_type_index_at(index2);
1028 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1029 if (match) {
1030 return true;
1031 }
1032 } break;
1034 case JVM_CONSTANT_MethodHandle:
1035 {
1036 int k1 = method_handle_ref_kind_at(index1);
1037 int k2 = cp2->method_handle_ref_kind_at(index2);
1038 if (k1 == k2) {
1039 int i1 = method_handle_index_at(index1);
1040 int i2 = cp2->method_handle_index_at(index2);
1041 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1042 if (match) {
1043 return true;
1044 }
1045 }
1046 } break;
1048 case JVM_CONSTANT_InvokeDynamic:
1049 {
1050 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
1051 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
1052 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1053 if (!match) return false;
1054 k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1055 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1056 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1057 if (!match) return false;
1058 int argc = invoke_dynamic_argument_count_at(index1);
1059 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) {
1060 for (int j = 0; j < argc; j++) {
1061 k1 = invoke_dynamic_argument_index_at(index1, j);
1062 k2 = cp2->invoke_dynamic_argument_index_at(index2, j);
1063 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1064 if (!match) return false;
1065 }
1066 return true; // got through loop; all elements equal
1067 }
1068 } break;
1070 case JVM_CONSTANT_String:
1071 {
1072 Symbol* s1 = unresolved_string_at(index1);
1073 Symbol* s2 = cp2->unresolved_string_at(index2);
1074 if (s1 == s2) {
1075 return true;
1076 }
1077 } break;
1079 case JVM_CONSTANT_Utf8:
1080 {
1081 Symbol* s1 = symbol_at(index1);
1082 Symbol* s2 = cp2->symbol_at(index2);
1083 if (s1 == s2) {
1084 return true;
1085 }
1086 } break;
1088 // Invalid is used as the tag for the second constant pool entry
1089 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1090 // not be seen by itself.
1091 case JVM_CONSTANT_Invalid: // fall through
1093 default:
1094 ShouldNotReachHere();
1095 break;
1096 }
1098 return false;
1099 } // end compare_entry_to()
1102 // Copy this constant pool's entries at start_i to end_i (inclusive)
1103 // to the constant pool to_cp's entries starting at to_i. A total of
1104 // (end_i - start_i) + 1 entries are copied.
1105 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1106 constantPoolHandle to_cp, int to_i, TRAPS) {
1108 int dest_i = to_i; // leave original alone for debug purposes
1110 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1111 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1113 switch (from_cp->tag_at(src_i).value()) {
1114 case JVM_CONSTANT_Double:
1115 case JVM_CONSTANT_Long:
1116 // double and long take two constant pool entries
1117 src_i += 2;
1118 dest_i += 2;
1119 break;
1121 default:
1122 // all others take one constant pool entry
1123 src_i++;
1124 dest_i++;
1125 break;
1126 }
1127 }
1129 int from_oplen = operand_array_length(from_cp->operands());
1130 int old_oplen = operand_array_length(to_cp->operands());
1131 if (from_oplen != 0) {
1132 // append my operands to the target's operands array
1133 if (old_oplen == 0) {
1134 to_cp->set_operands(from_cp->operands()); // reuse; do not merge
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 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1142 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1143 int fillp = 0, len = 0;
1144 // first part of dest
1145 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1146 new_operands->adr_at(fillp),
1147 (len = old_off) * sizeof(u2));
1148 fillp += len;
1149 // first part of src
1150 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1151 new_operands->adr_at(fillp),
1152 (len = from_off) * sizeof(u2));
1153 fillp += len;
1154 // second part of dest
1155 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1156 new_operands->adr_at(fillp),
1157 (len = old_len - old_off) * sizeof(u2));
1158 fillp += len;
1159 // second part of src
1160 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(from_off),
1161 new_operands->adr_at(fillp),
1162 (len = from_len - from_off) * sizeof(u2));
1163 fillp += len;
1164 assert(fillp == new_operands->length(), "");
1166 // Adjust indexes in the first part of the copied operands array.
1167 for (int j = 0; j < from_oplen; j++) {
1168 int offset = operand_offset_at(new_operands, old_oplen + j);
1169 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1170 offset += old_len; // every new tuple is preceded by old_len extra u2's
1171 operand_offset_at_put(new_operands, old_oplen + j, offset);
1172 }
1174 // replace target operands array with combined array
1175 to_cp->set_operands(new_operands);
1176 }
1177 }
1179 } // end copy_cp_to()
1182 // Copy this constant pool's entry at from_i to the constant pool
1183 // to_cp's entry at to_i.
1184 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1185 constantPoolHandle to_cp, int to_i,
1186 TRAPS) {
1188 int tag = from_cp->tag_at(from_i).value();
1189 switch (tag) {
1190 case JVM_CONSTANT_Class:
1191 {
1192 Klass* k = from_cp->klass_at(from_i, CHECK);
1193 to_cp->klass_at_put(to_i, k);
1194 } break;
1196 case JVM_CONSTANT_ClassIndex:
1197 {
1198 jint ki = from_cp->klass_index_at(from_i);
1199 to_cp->klass_index_at_put(to_i, ki);
1200 } break;
1202 case JVM_CONSTANT_Double:
1203 {
1204 jdouble d = from_cp->double_at(from_i);
1205 to_cp->double_at_put(to_i, d);
1206 // double takes two constant pool entries so init second entry's tag
1207 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1208 } break;
1210 case JVM_CONSTANT_Fieldref:
1211 {
1212 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1213 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1214 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1215 } break;
1217 case JVM_CONSTANT_Float:
1218 {
1219 jfloat f = from_cp->float_at(from_i);
1220 to_cp->float_at_put(to_i, f);
1221 } break;
1223 case JVM_CONSTANT_Integer:
1224 {
1225 jint i = from_cp->int_at(from_i);
1226 to_cp->int_at_put(to_i, i);
1227 } break;
1229 case JVM_CONSTANT_InterfaceMethodref:
1230 {
1231 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1232 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1233 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1234 } break;
1236 case JVM_CONSTANT_Long:
1237 {
1238 jlong l = from_cp->long_at(from_i);
1239 to_cp->long_at_put(to_i, l);
1240 // long takes two constant pool entries so init second entry's tag
1241 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1242 } break;
1244 case JVM_CONSTANT_Methodref:
1245 {
1246 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1247 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1248 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1249 } break;
1251 case JVM_CONSTANT_NameAndType:
1252 {
1253 int name_ref_index = from_cp->name_ref_index_at(from_i);
1254 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1255 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1256 } break;
1258 case JVM_CONSTANT_StringIndex:
1259 {
1260 jint si = from_cp->string_index_at(from_i);
1261 to_cp->string_index_at_put(to_i, si);
1262 } break;
1264 case JVM_CONSTANT_UnresolvedClass:
1265 {
1266 // Can be resolved after checking tag, so check the slot first.
1267 CPSlot entry = from_cp->slot_at(from_i);
1268 if (entry.is_resolved()) {
1269 assert(entry.get_klass()->is_klass(), "must be");
1270 // Already resolved
1271 to_cp->klass_at_put(to_i, entry.get_klass());
1272 } else {
1273 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1274 }
1275 } break;
1277 case JVM_CONSTANT_UnresolvedClassInError:
1278 {
1279 Symbol* k = from_cp->unresolved_klass_at(from_i);
1280 to_cp->unresolved_klass_at_put(to_i, k);
1281 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1282 } break;
1285 case JVM_CONSTANT_String:
1286 {
1287 Symbol* s = from_cp->unresolved_string_at(from_i);
1288 to_cp->unresolved_string_at_put(to_i, s);
1289 } break;
1291 case JVM_CONSTANT_Utf8:
1292 {
1293 Symbol* s = from_cp->symbol_at(from_i);
1294 // Need to increase refcount, the old one will be thrown away and deferenced
1295 s->increment_refcount();
1296 to_cp->symbol_at_put(to_i, s);
1297 } break;
1299 case JVM_CONSTANT_MethodType:
1300 {
1301 jint k = from_cp->method_type_index_at(from_i);
1302 to_cp->method_type_index_at_put(to_i, k);
1303 } break;
1305 case JVM_CONSTANT_MethodHandle:
1306 {
1307 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1308 int k2 = from_cp->method_handle_index_at(from_i);
1309 to_cp->method_handle_index_at_put(to_i, k1, k2);
1310 } break;
1312 case JVM_CONSTANT_InvokeDynamic:
1313 {
1314 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1315 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1316 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1317 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1318 } break;
1320 // Invalid is used as the tag for the second constant pool entry
1321 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1322 // not be seen by itself.
1323 case JVM_CONSTANT_Invalid: // fall through
1325 default:
1326 {
1327 ShouldNotReachHere();
1328 } break;
1329 }
1330 } // end copy_entry_to()
1333 // Search constant pool search_cp for an entry that matches this
1334 // constant pool's entry at pattern_i. Returns the index of a
1335 // matching entry or zero (0) if there is no matching entry.
1336 int ConstantPool::find_matching_entry(int pattern_i,
1337 constantPoolHandle search_cp, TRAPS) {
1339 // index zero (0) is not used
1340 for (int i = 1; i < search_cp->length(); i++) {
1341 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1342 if (found) {
1343 return i;
1344 }
1345 }
1347 return 0; // entry not found; return unused index zero (0)
1348 } // end find_matching_entry()
1351 #ifndef PRODUCT
1353 const char* ConstantPool::printable_name_at(int which) {
1355 constantTag tag = tag_at(which);
1357 if (tag.is_string()) {
1358 return string_at_noresolve(which);
1359 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1360 return klass_name_at(which)->as_C_string();
1361 } else if (tag.is_symbol()) {
1362 return symbol_at(which)->as_C_string();
1363 }
1364 return "";
1365 }
1367 #endif // PRODUCT
1370 // JVMTI GetConstantPool support
1372 // For temporary use until code is stable.
1373 #define DBG(code)
1375 static const char* WARN_MSG = "Must not be such entry!";
1377 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1378 jint size = 0;
1379 u2 idx1, idx2;
1381 for (jint idx = 1; idx < cnt; idx++) {
1382 jint ent_size = 0;
1383 u1 tag = *bytes++;
1384 size++; // count tag
1386 printf("const #%03d, tag: %02d ", idx, tag);
1387 switch(tag) {
1388 case JVM_CONSTANT_Invalid: {
1389 printf("Invalid");
1390 break;
1391 }
1392 case JVM_CONSTANT_Unicode: {
1393 printf("Unicode %s", WARN_MSG);
1394 break;
1395 }
1396 case JVM_CONSTANT_Utf8: {
1397 u2 len = Bytes::get_Java_u2(bytes);
1398 char str[128];
1399 if (len > 127) {
1400 len = 127;
1401 }
1402 strncpy(str, (char *) (bytes+2), len);
1403 str[len] = '\0';
1404 printf("Utf8 \"%s\"", str);
1405 ent_size = 2 + len;
1406 break;
1407 }
1408 case JVM_CONSTANT_Integer: {
1409 u4 val = Bytes::get_Java_u4(bytes);
1410 printf("int %d", *(int *) &val);
1411 ent_size = 4;
1412 break;
1413 }
1414 case JVM_CONSTANT_Float: {
1415 u4 val = Bytes::get_Java_u4(bytes);
1416 printf("float %5.3ff", *(float *) &val);
1417 ent_size = 4;
1418 break;
1419 }
1420 case JVM_CONSTANT_Long: {
1421 u8 val = Bytes::get_Java_u8(bytes);
1422 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1423 ent_size = 8;
1424 idx++; // Long takes two cpool slots
1425 break;
1426 }
1427 case JVM_CONSTANT_Double: {
1428 u8 val = Bytes::get_Java_u8(bytes);
1429 printf("double %5.3fd", *(jdouble *)&val);
1430 ent_size = 8;
1431 idx++; // Double takes two cpool slots
1432 break;
1433 }
1434 case JVM_CONSTANT_Class: {
1435 idx1 = Bytes::get_Java_u2(bytes);
1436 printf("class #%03d", idx1);
1437 ent_size = 2;
1438 break;
1439 }
1440 case JVM_CONSTANT_String: {
1441 idx1 = Bytes::get_Java_u2(bytes);
1442 printf("String #%03d", idx1);
1443 ent_size = 2;
1444 break;
1445 }
1446 case JVM_CONSTANT_Fieldref: {
1447 idx1 = Bytes::get_Java_u2(bytes);
1448 idx2 = Bytes::get_Java_u2(bytes+2);
1449 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1450 ent_size = 4;
1451 break;
1452 }
1453 case JVM_CONSTANT_Methodref: {
1454 idx1 = Bytes::get_Java_u2(bytes);
1455 idx2 = Bytes::get_Java_u2(bytes+2);
1456 printf("Method #%03d, #%03d", idx1, idx2);
1457 ent_size = 4;
1458 break;
1459 }
1460 case JVM_CONSTANT_InterfaceMethodref: {
1461 idx1 = Bytes::get_Java_u2(bytes);
1462 idx2 = Bytes::get_Java_u2(bytes+2);
1463 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1464 ent_size = 4;
1465 break;
1466 }
1467 case JVM_CONSTANT_NameAndType: {
1468 idx1 = Bytes::get_Java_u2(bytes);
1469 idx2 = Bytes::get_Java_u2(bytes+2);
1470 printf("NameAndType #%03d, #%03d", idx1, idx2);
1471 ent_size = 4;
1472 break;
1473 }
1474 case JVM_CONSTANT_ClassIndex: {
1475 printf("ClassIndex %s", WARN_MSG);
1476 break;
1477 }
1478 case JVM_CONSTANT_UnresolvedClass: {
1479 printf("UnresolvedClass: %s", WARN_MSG);
1480 break;
1481 }
1482 case JVM_CONSTANT_UnresolvedClassInError: {
1483 printf("UnresolvedClassInErr: %s", WARN_MSG);
1484 break;
1485 }
1486 case JVM_CONSTANT_StringIndex: {
1487 printf("StringIndex: %s", WARN_MSG);
1488 break;
1489 }
1490 }
1491 printf(";\n");
1492 bytes += ent_size;
1493 size += ent_size;
1494 }
1495 printf("Cpool size: %d\n", size);
1496 fflush(0);
1497 return;
1498 } /* end print_cpool_bytes */
1501 // Returns size of constant pool entry.
1502 jint ConstantPool::cpool_entry_size(jint idx) {
1503 switch(tag_at(idx).value()) {
1504 case JVM_CONSTANT_Invalid:
1505 case JVM_CONSTANT_Unicode:
1506 return 1;
1508 case JVM_CONSTANT_Utf8:
1509 return 3 + symbol_at(idx)->utf8_length();
1511 case JVM_CONSTANT_Class:
1512 case JVM_CONSTANT_String:
1513 case JVM_CONSTANT_ClassIndex:
1514 case JVM_CONSTANT_UnresolvedClass:
1515 case JVM_CONSTANT_UnresolvedClassInError:
1516 case JVM_CONSTANT_StringIndex:
1517 case JVM_CONSTANT_MethodType:
1518 return 3;
1520 case JVM_CONSTANT_MethodHandle:
1521 return 4; //tag, ref_kind, ref_index
1523 case JVM_CONSTANT_Integer:
1524 case JVM_CONSTANT_Float:
1525 case JVM_CONSTANT_Fieldref:
1526 case JVM_CONSTANT_Methodref:
1527 case JVM_CONSTANT_InterfaceMethodref:
1528 case JVM_CONSTANT_NameAndType:
1529 return 5;
1531 case JVM_CONSTANT_InvokeDynamic:
1532 // u1 tag, u2 bsm, u2 nt
1533 return 5;
1535 case JVM_CONSTANT_Long:
1536 case JVM_CONSTANT_Double:
1537 return 9;
1538 }
1539 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1540 return 1;
1541 } /* end cpool_entry_size */
1544 // SymbolHashMap is used to find a constant pool index from a string.
1545 // This function fills in SymbolHashMaps, one for utf8s and one for
1546 // class names, returns size of the cpool raw bytes.
1547 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1548 SymbolHashMap *classmap) {
1549 jint size = 0;
1551 for (u2 idx = 1; idx < length(); idx++) {
1552 u2 tag = tag_at(idx).value();
1553 size += cpool_entry_size(idx);
1555 switch(tag) {
1556 case JVM_CONSTANT_Utf8: {
1557 Symbol* sym = symbol_at(idx);
1558 symmap->add_entry(sym, idx);
1559 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1560 break;
1561 }
1562 case JVM_CONSTANT_Class:
1563 case JVM_CONSTANT_UnresolvedClass:
1564 case JVM_CONSTANT_UnresolvedClassInError: {
1565 Symbol* sym = klass_name_at(idx);
1566 classmap->add_entry(sym, idx);
1567 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1568 break;
1569 }
1570 case JVM_CONSTANT_Long:
1571 case JVM_CONSTANT_Double: {
1572 idx++; // Both Long and Double take two cpool slots
1573 break;
1574 }
1575 }
1576 }
1577 return size;
1578 } /* end hash_utf8_entries_to */
1581 // Copy cpool bytes.
1582 // Returns:
1583 // 0, in case of OutOfMemoryError
1584 // -1, in case of internal error
1585 // > 0, count of the raw cpool bytes that have been copied
1586 int ConstantPool::copy_cpool_bytes(int cpool_size,
1587 SymbolHashMap* tbl,
1588 unsigned char *bytes) {
1589 u2 idx1, idx2;
1590 jint size = 0;
1591 jint cnt = length();
1592 unsigned char *start_bytes = bytes;
1594 for (jint idx = 1; idx < cnt; idx++) {
1595 u1 tag = tag_at(idx).value();
1596 jint ent_size = cpool_entry_size(idx);
1598 assert(size + ent_size <= cpool_size, "Size mismatch");
1600 *bytes = tag;
1601 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1602 switch(tag) {
1603 case JVM_CONSTANT_Invalid: {
1604 DBG(printf("JVM_CONSTANT_Invalid"));
1605 break;
1606 }
1607 case JVM_CONSTANT_Unicode: {
1608 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1609 DBG(printf("JVM_CONSTANT_Unicode"));
1610 break;
1611 }
1612 case JVM_CONSTANT_Utf8: {
1613 Symbol* sym = symbol_at(idx);
1614 char* str = sym->as_utf8();
1615 // Warning! It's crashing on x86 with len = sym->utf8_length()
1616 int len = (int) strlen(str);
1617 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1618 for (int i = 0; i < len; i++) {
1619 bytes[3+i] = (u1) str[i];
1620 }
1621 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1622 break;
1623 }
1624 case JVM_CONSTANT_Integer: {
1625 jint val = int_at(idx);
1626 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1627 break;
1628 }
1629 case JVM_CONSTANT_Float: {
1630 jfloat val = float_at(idx);
1631 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1632 break;
1633 }
1634 case JVM_CONSTANT_Long: {
1635 jlong val = long_at(idx);
1636 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1637 idx++; // Long takes two cpool slots
1638 break;
1639 }
1640 case JVM_CONSTANT_Double: {
1641 jdouble val = double_at(idx);
1642 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1643 idx++; // Double takes two cpool slots
1644 break;
1645 }
1646 case JVM_CONSTANT_Class:
1647 case JVM_CONSTANT_UnresolvedClass:
1648 case JVM_CONSTANT_UnresolvedClassInError: {
1649 *bytes = JVM_CONSTANT_Class;
1650 Symbol* sym = klass_name_at(idx);
1651 idx1 = tbl->symbol_to_value(sym);
1652 assert(idx1 != 0, "Have not found a hashtable entry");
1653 Bytes::put_Java_u2((address) (bytes+1), idx1);
1654 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1655 break;
1656 }
1657 case JVM_CONSTANT_String: {
1658 *bytes = JVM_CONSTANT_String;
1659 Symbol* sym = unresolved_string_at(idx);
1660 idx1 = tbl->symbol_to_value(sym);
1661 assert(idx1 != 0, "Have not found a hashtable entry");
1662 Bytes::put_Java_u2((address) (bytes+1), idx1);
1663 DBG(char *str = sym->as_utf8());
1664 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
1665 break;
1666 }
1667 case JVM_CONSTANT_Fieldref:
1668 case JVM_CONSTANT_Methodref:
1669 case JVM_CONSTANT_InterfaceMethodref: {
1670 idx1 = uncached_klass_ref_index_at(idx);
1671 idx2 = uncached_name_and_type_ref_index_at(idx);
1672 Bytes::put_Java_u2((address) (bytes+1), idx1);
1673 Bytes::put_Java_u2((address) (bytes+3), idx2);
1674 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1675 break;
1676 }
1677 case JVM_CONSTANT_NameAndType: {
1678 idx1 = name_ref_index_at(idx);
1679 idx2 = signature_ref_index_at(idx);
1680 Bytes::put_Java_u2((address) (bytes+1), idx1);
1681 Bytes::put_Java_u2((address) (bytes+3), idx2);
1682 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1683 break;
1684 }
1685 case JVM_CONSTANT_ClassIndex: {
1686 *bytes = JVM_CONSTANT_Class;
1687 idx1 = klass_index_at(idx);
1688 Bytes::put_Java_u2((address) (bytes+1), idx1);
1689 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1690 break;
1691 }
1692 case JVM_CONSTANT_StringIndex: {
1693 *bytes = JVM_CONSTANT_String;
1694 idx1 = string_index_at(idx);
1695 Bytes::put_Java_u2((address) (bytes+1), idx1);
1696 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1697 break;
1698 }
1699 case JVM_CONSTANT_MethodHandle:
1700 case JVM_CONSTANT_MethodHandleInError: {
1701 *bytes = JVM_CONSTANT_MethodHandle;
1702 int kind = method_handle_ref_kind_at(idx);
1703 idx1 = method_handle_index_at(idx);
1704 *(bytes+1) = (unsigned char) kind;
1705 Bytes::put_Java_u2((address) (bytes+2), idx1);
1706 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1707 break;
1708 }
1709 case JVM_CONSTANT_MethodType:
1710 case JVM_CONSTANT_MethodTypeInError: {
1711 *bytes = JVM_CONSTANT_MethodType;
1712 idx1 = method_type_index_at(idx);
1713 Bytes::put_Java_u2((address) (bytes+1), idx1);
1714 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1715 break;
1716 }
1717 case JVM_CONSTANT_InvokeDynamic: {
1718 *bytes = tag;
1719 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1720 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1721 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1722 Bytes::put_Java_u2((address) (bytes+1), idx1);
1723 Bytes::put_Java_u2((address) (bytes+3), idx2);
1724 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1725 break;
1726 }
1727 }
1728 DBG(printf("\n"));
1729 bytes += ent_size;
1730 size += ent_size;
1731 }
1732 assert(size == cpool_size, "Size mismatch");
1734 // Keep temorarily for debugging until it's stable.
1735 DBG(print_cpool_bytes(cnt, start_bytes));
1736 return (int)(bytes - start_bytes);
1737 } /* end copy_cpool_bytes */
1740 void ConstantPool::set_on_stack(const bool value) {
1741 _on_stack = value;
1742 if (value) MetadataOnStackMark::record(this);
1743 }
1745 // JSR 292 support for patching constant pool oops after the class is linked and
1746 // the oop array for resolved references are created.
1747 // We can't do this during classfile parsing, which is how the other indexes are
1748 // patched. The other patches are applied early for some error checking
1749 // so only defer the pseudo_strings.
1750 void ConstantPool::patch_resolved_references(
1751 GrowableArray<Handle>* cp_patches) {
1752 assert(EnableInvokeDynamic, "");
1753 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1754 Handle patch = cp_patches->at(index);
1755 if (patch.not_null()) {
1756 assert (tag_at(index).is_string(), "should only be string left");
1757 // Patching a string means pre-resolving it.
1758 // The spelling in the constant pool is ignored.
1759 // The constant reference may be any object whatever.
1760 // If it is not a real interned string, the constant is referred
1761 // to as a "pseudo-string", and must be presented to the CP
1762 // explicitly, because it may require scavenging.
1763 int obj_index = cp_to_object_index(index);
1764 pseudo_string_at_put(index, obj_index, patch());
1765 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1766 }
1767 }
1768 #ifdef ASSERT
1769 // Ensure that all the patches have been used.
1770 for (int index = 0; index < cp_patches->length(); index++) {
1771 assert(cp_patches->at(index).is_null(),
1772 err_msg("Unused constant pool patch at %d in class file %s",
1773 index,
1774 InstanceKlass::cast(pool_holder())->external_name()));
1775 }
1776 #endif // ASSERT
1777 }
1779 #ifndef PRODUCT
1781 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1782 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1783 guarantee(obj->is_constantPool(), "object must be constant pool");
1784 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1785 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1787 for (int i = 0; i< cp->length(); i++) {
1788 if (cp->tag_at(i).is_unresolved_klass()) {
1789 // This will force loading of the class
1790 Klass* klass = cp->klass_at(i, CHECK);
1791 if (klass->oop_is_instance()) {
1792 // Force initialization of class
1793 InstanceKlass::cast(klass)->initialize(CHECK);
1794 }
1795 }
1796 }
1797 }
1799 #endif
1802 // Printing
1804 void ConstantPool::print_on(outputStream* st) const {
1805 EXCEPTION_MARK;
1806 assert(is_constantPool(), "must be constantPool");
1807 st->print_cr(internal_name());
1808 if (flags() != 0) {
1809 st->print(" - flags: 0x%x", flags());
1810 if (has_pseudo_string()) st->print(" has_pseudo_string");
1811 if (has_invokedynamic()) st->print(" has_invokedynamic");
1812 if (has_preresolution()) st->print(" has_preresolution");
1813 st->cr();
1814 }
1815 if (pool_holder() != NULL) {
1816 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
1817 }
1818 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
1819 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references());
1820 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
1822 for (int index = 1; index < length(); index++) { // Index 0 is unused
1823 ((ConstantPool*)this)->print_entry_on(index, st);
1824 switch (tag_at(index).value()) {
1825 case JVM_CONSTANT_Long :
1826 case JVM_CONSTANT_Double :
1827 index++; // Skip entry following eigth-byte constant
1828 }
1830 }
1831 st->cr();
1832 }
1834 // Print one constant pool entry
1835 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1836 EXCEPTION_MARK;
1837 st->print(" - %3d : ", index);
1838 tag_at(index).print_on(st);
1839 st->print(" : ");
1840 switch (tag_at(index).value()) {
1841 case JVM_CONSTANT_Class :
1842 { Klass* k = klass_at(index, CATCH);
1843 k->print_value_on(st);
1844 st->print(" {0x%lx}", (address)k);
1845 }
1846 break;
1847 case JVM_CONSTANT_Fieldref :
1848 case JVM_CONSTANT_Methodref :
1849 case JVM_CONSTANT_InterfaceMethodref :
1850 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1851 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1852 break;
1853 case JVM_CONSTANT_String :
1854 unresolved_string_at(index)->print_value_on(st);
1855 break;
1856 case JVM_CONSTANT_Object : {
1857 oop anObj = object_at(index);
1858 anObj->print_value_on(st);
1859 st->print(" {0x%lx}", (address)anObj);
1860 } break;
1861 case JVM_CONSTANT_Integer :
1862 st->print("%d", int_at(index));
1863 break;
1864 case JVM_CONSTANT_Float :
1865 st->print("%f", float_at(index));
1866 break;
1867 case JVM_CONSTANT_Long :
1868 st->print_jlong(long_at(index));
1869 break;
1870 case JVM_CONSTANT_Double :
1871 st->print("%lf", double_at(index));
1872 break;
1873 case JVM_CONSTANT_NameAndType :
1874 st->print("name_index=%d", name_ref_index_at(index));
1875 st->print(" signature_index=%d", signature_ref_index_at(index));
1876 break;
1877 case JVM_CONSTANT_Utf8 :
1878 symbol_at(index)->print_value_on(st);
1879 break;
1880 case JVM_CONSTANT_UnresolvedClass : // fall-through
1881 case JVM_CONSTANT_UnresolvedClassInError: {
1882 // unresolved_klass_at requires lock or safe world.
1883 CPSlot entry = slot_at(index);
1884 if (entry.is_resolved()) {
1885 entry.get_klass()->print_value_on(st);
1886 } else {
1887 entry.get_symbol()->print_value_on(st);
1888 }
1889 }
1890 break;
1891 case JVM_CONSTANT_MethodHandle :
1892 case JVM_CONSTANT_MethodHandleInError :
1893 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
1894 st->print(" ref_index=%d", method_handle_index_at(index));
1895 break;
1896 case JVM_CONSTANT_MethodType :
1897 case JVM_CONSTANT_MethodTypeInError :
1898 st->print("signature_index=%d", method_type_index_at(index));
1899 break;
1900 case JVM_CONSTANT_InvokeDynamic :
1901 {
1902 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1903 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1904 int argc = invoke_dynamic_argument_count_at(index);
1905 if (argc > 0) {
1906 for (int arg_i = 0; arg_i < argc; arg_i++) {
1907 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1908 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1909 }
1910 st->print("}");
1911 }
1912 }
1913 break;
1914 default:
1915 ShouldNotReachHere();
1916 break;
1917 }
1918 st->cr();
1919 }
1921 void ConstantPool::print_value_on(outputStream* st) const {
1922 assert(is_constantPool(), "must be constantPool");
1923 st->print("constant pool [%d]", length());
1924 if (has_pseudo_string()) st->print("/pseudo_string");
1925 if (has_invokedynamic()) st->print("/invokedynamic");
1926 if (has_preresolution()) st->print("/preresolution");
1927 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
1928 print_address_on(st);
1929 st->print(" for ");
1930 pool_holder()->print_value_on(st);
1931 if (pool_holder() != NULL) {
1932 bool extra = (InstanceKlass::cast(pool_holder())->constants() != this);
1933 if (extra) st->print(" (extra)");
1934 }
1935 if (cache() != NULL) {
1936 st->print(" cache=" PTR_FORMAT, cache());
1937 }
1938 }
1941 // Verification
1943 void ConstantPool::verify_on(outputStream* st) {
1944 guarantee(is_constantPool(), "object must be constant pool");
1945 for (int i = 0; i< length(); i++) {
1946 constantTag tag = tag_at(i);
1947 CPSlot entry = slot_at(i);
1948 if (tag.is_klass()) {
1949 if (entry.is_resolved()) {
1950 guarantee(entry.get_klass()->is_metadata(), "should be metadata");
1951 guarantee(entry.get_klass()->is_klass(), "should be klass");
1952 }
1953 } else if (tag.is_unresolved_klass()) {
1954 if (entry.is_resolved()) {
1955 guarantee(entry.get_klass()->is_metadata(), "should be metadata");
1956 guarantee(entry.get_klass()->is_klass(), "should be klass");
1957 }
1958 } else if (tag.is_symbol()) {
1959 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
1960 } else if (tag.is_string()) {
1961 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
1962 }
1963 }
1964 if (cache() != NULL) {
1965 // Note: cache() can be NULL before a class is completely setup or
1966 // in temporary constant pools used during constant pool merging
1967 guarantee(cache()->is_metadata(), "should be metadata");
1968 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
1969 }
1970 if (pool_holder() != NULL) {
1971 // Note: pool_holder() can be NULL in temporary constant pools
1972 // used during constant pool merging
1973 guarantee(pool_holder()->is_metadata(), "should be metadata");
1974 guarantee(pool_holder()->is_klass(), "should be klass");
1975 }
1976 }
1979 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
1980 char *str = sym->as_utf8();
1981 unsigned int hash = compute_hash(str, sym->utf8_length());
1982 unsigned int index = hash % table_size();
1984 // check if already in map
1985 // we prefer the first entry since it is more likely to be what was used in
1986 // the class file
1987 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1988 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1989 if (en->hash() == hash && en->symbol() == sym) {
1990 return; // already there
1991 }
1992 }
1994 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
1995 entry->set_next(bucket(index));
1996 _buckets[index].set_entry(entry);
1997 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1998 }
2000 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2001 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2002 char *str = sym->as_utf8();
2003 int len = sym->utf8_length();
2004 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2005 unsigned int index = hash % table_size();
2006 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2007 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2008 if (en->hash() == hash && en->symbol() == sym) {
2009 return en;
2010 }
2011 }
2012 return NULL;
2013 }