Wed, 23 Jan 2013 13:02:39 -0500
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
Summary: Rename INCLUDE_ALTERNATE_GCS to INCLUDE_ALL_GCS and replace SERIALGC with INCLUDE_ALL_GCS.
Reviewed-by: coleenp, stefank
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 *
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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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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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, 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 = 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 = 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 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 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 = this_oop->pool_holder()->class_loader_data();
343 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
344 this_oop->klass_at_put(which, k());
345 }
346 }
347 }
349 entry = this_oop->resolved_klass_at(which);
350 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
351 return entry.get_klass();
352 }
355 // Does not update ConstantPool* - to avoid any exception throwing. Used
356 // by compiler and exception handling. Also used to avoid classloads for
357 // instanceof operations. Returns NULL if the class has not been loaded or
358 // if the verification of constant pool failed
359 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
360 CPSlot entry = this_oop->slot_at(which);
361 if (entry.is_resolved()) {
362 assert(entry.get_klass()->is_klass(), "must be");
363 return entry.get_klass();
364 } else {
365 assert(entry.is_unresolved(), "must be either symbol or klass");
366 Thread *thread = Thread::current();
367 Symbol* name = entry.get_symbol();
368 oop loader = this_oop->pool_holder()->class_loader();
369 oop protection_domain = this_oop->pool_holder()->protection_domain();
370 Handle h_prot (thread, protection_domain);
371 Handle h_loader (thread, loader);
372 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
374 if (k != NULL) {
375 // Make sure that resolving is legal
376 EXCEPTION_MARK;
377 KlassHandle klass(THREAD, k);
378 // return NULL if verification fails
379 verify_constant_pool_resolve(this_oop, klass, THREAD);
380 if (HAS_PENDING_EXCEPTION) {
381 CLEAR_PENDING_EXCEPTION;
382 return NULL;
383 }
384 return klass();
385 } else {
386 return k;
387 }
388 }
389 }
392 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
393 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
394 }
397 // This is an interface for the compiler that allows accessing non-resolved entries
398 // in the constant pool - but still performs the validations tests. Must be used
399 // in a pre-parse of the compiler - to determine what it can do and not do.
400 // Note: We cannot update the ConstantPool from the vm_thread.
401 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
402 int which = this_oop->klass_ref_index_at(index);
403 CPSlot entry = this_oop->slot_at(which);
404 if (entry.is_resolved()) {
405 assert(entry.get_klass()->is_klass(), "must be");
406 return entry.get_klass();
407 } else {
408 assert(entry.is_unresolved(), "must be either symbol or klass");
409 Symbol* name = entry.get_symbol();
410 oop loader = this_oop->pool_holder()->class_loader();
411 oop protection_domain = this_oop->pool_holder()->protection_domain();
412 Handle h_loader(THREAD, loader);
413 Handle h_prot (THREAD, protection_domain);
414 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
416 // Do access check for klasses
417 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
418 return k();
419 }
420 }
423 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
424 int which) {
425 if (cpool->cache() == NULL) return NULL; // nothing to load yet
426 int cache_index = decode_cpcache_index(which, true);
427 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
428 // FIXME: should be an assert
429 if (PrintMiscellaneous && (Verbose||WizardMode)) {
430 tty->print_cr("bad operand %d in:", which); cpool->print();
431 }
432 return NULL;
433 }
434 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
435 return e->method_if_resolved(cpool);
436 }
439 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
440 if (cpool->cache() == NULL) return false; // nothing to load yet
441 int cache_index = decode_cpcache_index(which, true);
442 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
443 return e->has_appendix();
444 }
446 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
447 if (cpool->cache() == NULL) return NULL; // nothing to load yet
448 int cache_index = decode_cpcache_index(which, true);
449 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
450 return e->appendix_if_resolved(cpool);
451 }
454 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) {
455 if (cpool->cache() == NULL) return false; // nothing to load yet
456 int cache_index = decode_cpcache_index(which, true);
457 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
458 return e->has_method_type();
459 }
461 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) {
462 if (cpool->cache() == NULL) return NULL; // nothing to load yet
463 int cache_index = decode_cpcache_index(which, true);
464 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
465 return e->method_type_if_resolved(cpool);
466 }
469 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
470 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
471 return symbol_at(name_index);
472 }
475 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
476 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
477 return symbol_at(signature_index);
478 }
481 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
482 int i = which;
483 if (!uncached && cache() != NULL) {
484 if (ConstantPool::is_invokedynamic_index(which)) {
485 // Invokedynamic index is index into resolved_references
486 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
487 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
488 assert(tag_at(pool_index).is_name_and_type(), "");
489 return pool_index;
490 }
491 // change byte-ordering and go via cache
492 i = remap_instruction_operand_from_cache(which);
493 } else {
494 if (tag_at(which).is_invoke_dynamic()) {
495 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
496 assert(tag_at(pool_index).is_name_and_type(), "");
497 return pool_index;
498 }
499 }
500 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
501 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
502 jint ref_index = *int_at_addr(i);
503 return extract_high_short_from_int(ref_index);
504 }
507 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
508 guarantee(!ConstantPool::is_invokedynamic_index(which),
509 "an invokedynamic instruction does not have a klass");
510 int i = which;
511 if (!uncached && cache() != NULL) {
512 // change byte-ordering and go via cache
513 i = remap_instruction_operand_from_cache(which);
514 }
515 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
516 jint ref_index = *int_at_addr(i);
517 return extract_low_short_from_int(ref_index);
518 }
522 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
523 int cpc_index = operand;
524 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
525 assert((int)(u2)cpc_index == cpc_index, "clean u2");
526 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
527 return member_index;
528 }
531 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
532 if (k->oop_is_instance() || k->oop_is_objArray()) {
533 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
534 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
535 KlassHandle element (THREAD, elem_oop);
537 // The element type could be a typeArray - we only need the access check if it is
538 // an reference to another class
539 if (element->oop_is_instance()) {
540 LinkResolver::check_klass_accessability(holder, element, CHECK);
541 }
542 }
543 }
546 int ConstantPool::name_ref_index_at(int which_nt) {
547 jint ref_index = name_and_type_at(which_nt);
548 return extract_low_short_from_int(ref_index);
549 }
552 int ConstantPool::signature_ref_index_at(int which_nt) {
553 jint ref_index = name_and_type_at(which_nt);
554 return extract_high_short_from_int(ref_index);
555 }
558 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
559 return klass_at(klass_ref_index_at(which), CHECK_NULL);
560 }
563 Symbol* ConstantPool::klass_name_at(int which) {
564 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
565 "Corrupted constant pool");
566 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
567 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
568 // tag is not updated atomicly.
569 CPSlot entry = slot_at(which);
570 if (entry.is_resolved()) {
571 // Already resolved - return entry's name.
572 assert(entry.get_klass()->is_klass(), "must be");
573 return entry.get_klass()->name();
574 } else {
575 assert(entry.is_unresolved(), "must be either symbol or klass");
576 return entry.get_symbol();
577 }
578 }
580 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
581 jint ref_index = klass_ref_index_at(which);
582 return klass_at_noresolve(ref_index);
583 }
585 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
586 jint ref_index = uncached_klass_ref_index_at(which);
587 return klass_at_noresolve(ref_index);
588 }
590 char* ConstantPool::string_at_noresolve(int which) {
591 Symbol* s = unresolved_string_at(which);
592 if (s == NULL) {
593 return (char*)"<pseudo-string>";
594 } else {
595 return unresolved_string_at(which)->as_C_string();
596 }
597 }
599 BasicType ConstantPool::basic_type_for_signature_at(int which) {
600 return FieldType::basic_type(symbol_at(which));
601 }
604 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
605 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
606 if (this_oop->tag_at(index).is_string()) {
607 this_oop->string_at(index, CHECK);
608 }
609 }
610 }
612 // Resolve all the classes in the constant pool. If they are all resolved,
613 // the constant pool is read-only. Enhancement: allocate cp entries to
614 // another metaspace, and copy to read-only or read-write space if this
615 // bit is set.
616 bool ConstantPool::resolve_class_constants(TRAPS) {
617 constantPoolHandle cp(THREAD, this);
618 for (int index = 1; index < length(); index++) { // Index 0 is unused
619 if (tag_at(index).is_unresolved_klass() &&
620 klass_at_if_loaded(cp, index) == NULL) {
621 return false;
622 }
623 }
624 // set_preresolution(); or some bit for future use
625 return true;
626 }
628 // If resolution for MethodHandle or MethodType fails, save the exception
629 // in the resolution error table, so that the same exception is thrown again.
630 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
631 int tag, TRAPS) {
632 ResourceMark rm;
633 Symbol* error = PENDING_EXCEPTION->klass()->name();
634 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag.
636 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
637 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
639 if (!PENDING_EXCEPTION->
640 is_a(SystemDictionary::LinkageError_klass())) {
641 // Just throw the exception and don't prevent these classes from
642 // being loaded due to virtual machine errors like StackOverflow
643 // and OutOfMemoryError, etc, or if the thread was hit by stop()
644 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
646 } else if (this_oop->tag_at(which).value() != error_tag) {
647 SystemDictionary::add_resolution_error(this_oop, which, error);
648 this_oop->tag_at_put(which, error_tag);
649 } else {
650 // some other thread has put the class in error state.
651 error = SystemDictionary::find_resolution_error(this_oop, which);
652 assert(error != NULL, "checking");
653 CLEAR_PENDING_EXCEPTION;
654 THROW_MSG(error, "");
655 }
656 }
659 // Called to resolve constants in the constant pool and return an oop.
660 // Some constant pool entries cache their resolved oop. This is also
661 // called to create oops from constants to use in arguments for invokedynamic
662 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
663 oop result_oop = NULL;
664 Handle throw_exception;
666 if (cache_index == _possible_index_sentinel) {
667 // It is possible that this constant is one which is cached in the objects.
668 // We'll do a linear search. This should be OK because this usage is rare.
669 assert(index > 0, "valid index");
670 cache_index = this_oop->cp_to_object_index(index);
671 }
672 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
673 assert(index == _no_index_sentinel || index >= 0, "");
675 if (cache_index >= 0) {
676 result_oop = this_oop->resolved_references()->obj_at(cache_index);
677 if (result_oop != NULL) {
678 return result_oop;
679 // That was easy...
680 }
681 index = this_oop->object_to_cp_index(cache_index);
682 }
684 jvalue prim_value; // temp used only in a few cases below
686 int tag_value = this_oop->tag_at(index).value();
688 switch (tag_value) {
690 case JVM_CONSTANT_UnresolvedClass:
691 case JVM_CONSTANT_UnresolvedClassInError:
692 case JVM_CONSTANT_Class:
693 {
694 assert(cache_index == _no_index_sentinel, "should not have been set");
695 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
696 // ldc wants the java mirror.
697 result_oop = resolved->java_mirror();
698 break;
699 }
701 case JVM_CONSTANT_String:
702 assert(cache_index != _no_index_sentinel, "should have been set");
703 if (this_oop->is_pseudo_string_at(index)) {
704 result_oop = this_oop->pseudo_string_at(index, cache_index);
705 break;
706 }
707 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
708 break;
710 case JVM_CONSTANT_Object:
711 result_oop = this_oop->object_at(index);
712 break;
714 case JVM_CONSTANT_MethodHandleInError:
715 case JVM_CONSTANT_MethodTypeInError:
716 {
717 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
718 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
719 ResourceMark rm;
720 THROW_MSG_0(error, "");
721 break;
722 }
724 case JVM_CONSTANT_MethodHandle:
725 {
726 int ref_kind = this_oop->method_handle_ref_kind_at(index);
727 int callee_index = this_oop->method_handle_klass_index_at(index);
728 Symbol* name = this_oop->method_handle_name_ref_at(index);
729 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
730 if (PrintMiscellaneous)
731 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
732 ref_kind, index, this_oop->method_handle_index_at(index),
733 callee_index, name->as_C_string(), signature->as_C_string());
734 KlassHandle callee;
735 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
736 callee = KlassHandle(THREAD, k);
737 }
738 KlassHandle klass(THREAD, this_oop->pool_holder());
739 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
740 callee, name, signature,
741 THREAD);
742 result_oop = value();
743 if (HAS_PENDING_EXCEPTION) {
744 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
745 }
746 break;
747 }
749 case JVM_CONSTANT_MethodType:
750 {
751 Symbol* signature = this_oop->method_type_signature_at(index);
752 if (PrintMiscellaneous)
753 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
754 index, this_oop->method_type_index_at(index),
755 signature->as_C_string());
756 KlassHandle klass(THREAD, this_oop->pool_holder());
757 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
758 result_oop = value();
759 if (HAS_PENDING_EXCEPTION) {
760 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
761 }
762 break;
763 }
765 case JVM_CONSTANT_Integer:
766 assert(cache_index == _no_index_sentinel, "should not have been set");
767 prim_value.i = this_oop->int_at(index);
768 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
769 break;
771 case JVM_CONSTANT_Float:
772 assert(cache_index == _no_index_sentinel, "should not have been set");
773 prim_value.f = this_oop->float_at(index);
774 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
775 break;
777 case JVM_CONSTANT_Long:
778 assert(cache_index == _no_index_sentinel, "should not have been set");
779 prim_value.j = this_oop->long_at(index);
780 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
781 break;
783 case JVM_CONSTANT_Double:
784 assert(cache_index == _no_index_sentinel, "should not have been set");
785 prim_value.d = this_oop->double_at(index);
786 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
787 break;
789 default:
790 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
791 this_oop(), index, cache_index, tag_value) );
792 assert(false, "unexpected constant tag");
793 break;
794 }
796 if (cache_index >= 0) {
797 // Cache the oop here also.
798 Handle result_handle(THREAD, result_oop);
799 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this
800 oop result = this_oop->resolved_references()->obj_at(cache_index);
801 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
802 // The important thing here is that all threads pick up the same result.
803 // It doesn't matter which racing thread wins, as long as only one
804 // result is used by all threads, and all future queries.
805 // That result may be either a resolved constant or a failure exception.
806 if (result == NULL) {
807 this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
808 return result_handle();
809 } else {
810 // Return the winning thread's result. This can be different than
811 // result_handle() for MethodHandles.
812 return result;
813 }
814 } else {
815 return result_oop;
816 }
817 }
819 oop ConstantPool::uncached_string_at(int which, TRAPS) {
820 Symbol* sym = unresolved_string_at(which);
821 oop str = StringTable::intern(sym, CHECK_(NULL));
822 assert(java_lang_String::is_instance(str), "must be string");
823 return str;
824 }
827 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
828 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
830 Handle bsm;
831 int argc;
832 {
833 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
834 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
835 // It is accompanied by the optional arguments.
836 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
837 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
838 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
839 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
840 }
842 // Extract the optional static arguments.
843 argc = this_oop->invoke_dynamic_argument_count_at(index);
844 if (argc == 0) return bsm_oop;
846 bsm = Handle(THREAD, bsm_oop);
847 }
849 objArrayHandle info;
850 {
851 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
852 info = objArrayHandle(THREAD, info_oop);
853 }
855 info->obj_at_put(0, bsm());
856 for (int i = 0; i < argc; i++) {
857 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
858 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
859 info->obj_at_put(1+i, arg_oop);
860 }
862 return info();
863 }
865 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
866 // If the string has already been interned, this entry will be non-null
867 oop str = this_oop->resolved_references()->obj_at(obj_index);
868 if (str != NULL) return str;
870 Symbol* sym = this_oop->unresolved_string_at(which);
871 str = StringTable::intern(sym, CHECK_(NULL));
872 this_oop->string_at_put(which, obj_index, str);
873 assert(java_lang_String::is_instance(str), "must be string");
874 return str;
875 }
878 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
879 int which) {
880 // Names are interned, so we can compare Symbol*s directly
881 Symbol* cp_name = klass_name_at(which);
882 return (cp_name == k->name());
883 }
886 // Iterate over symbols and decrement ones which are Symbol*s.
887 // This is done during GC so do not need to lock constantPool unless we
888 // have per-thread safepoints.
889 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
890 // these symbols but didn't increment the reference count.
891 void ConstantPool::unreference_symbols() {
892 for (int index = 1; index < length(); index++) { // Index 0 is unused
893 constantTag tag = tag_at(index);
894 if (tag.is_symbol()) {
895 symbol_at(index)->decrement_refcount();
896 }
897 }
898 }
901 // Compare this constant pool's entry at index1 to the constant pool
902 // cp2's entry at index2.
903 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
904 int index2, TRAPS) {
906 jbyte t1 = tag_at(index1).value();
907 jbyte t2 = cp2->tag_at(index2).value();
910 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
911 // when comparing
912 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
913 t1 = JVM_CONSTANT_UnresolvedClass;
914 }
915 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
916 t2 = JVM_CONSTANT_UnresolvedClass;
917 }
919 if (t1 != t2) {
920 // Not the same entry type so there is nothing else to check. Note
921 // that this style of checking will consider resolved/unresolved
922 // class pairs as different.
923 // From the ConstantPool* API point of view, this is correct
924 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
925 // plays out in the context of ConstantPool* merging.
926 return false;
927 }
929 switch (t1) {
930 case JVM_CONSTANT_Class:
931 {
932 Klass* k1 = klass_at(index1, CHECK_false);
933 Klass* k2 = cp2->klass_at(index2, CHECK_false);
934 if (k1 == k2) {
935 return true;
936 }
937 } break;
939 case JVM_CONSTANT_ClassIndex:
940 {
941 int recur1 = klass_index_at(index1);
942 int recur2 = cp2->klass_index_at(index2);
943 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
944 if (match) {
945 return true;
946 }
947 } break;
949 case JVM_CONSTANT_Double:
950 {
951 jdouble d1 = double_at(index1);
952 jdouble d2 = cp2->double_at(index2);
953 if (d1 == d2) {
954 return true;
955 }
956 } break;
958 case JVM_CONSTANT_Fieldref:
959 case JVM_CONSTANT_InterfaceMethodref:
960 case JVM_CONSTANT_Methodref:
961 {
962 int recur1 = uncached_klass_ref_index_at(index1);
963 int recur2 = cp2->uncached_klass_ref_index_at(index2);
964 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
965 if (match) {
966 recur1 = uncached_name_and_type_ref_index_at(index1);
967 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
968 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
969 if (match) {
970 return true;
971 }
972 }
973 } break;
975 case JVM_CONSTANT_Float:
976 {
977 jfloat f1 = float_at(index1);
978 jfloat f2 = cp2->float_at(index2);
979 if (f1 == f2) {
980 return true;
981 }
982 } break;
984 case JVM_CONSTANT_Integer:
985 {
986 jint i1 = int_at(index1);
987 jint i2 = cp2->int_at(index2);
988 if (i1 == i2) {
989 return true;
990 }
991 } break;
993 case JVM_CONSTANT_Long:
994 {
995 jlong l1 = long_at(index1);
996 jlong l2 = cp2->long_at(index2);
997 if (l1 == l2) {
998 return true;
999 }
1000 } break;
1002 case JVM_CONSTANT_NameAndType:
1003 {
1004 int recur1 = name_ref_index_at(index1);
1005 int recur2 = cp2->name_ref_index_at(index2);
1006 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1007 if (match) {
1008 recur1 = signature_ref_index_at(index1);
1009 recur2 = cp2->signature_ref_index_at(index2);
1010 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1011 if (match) {
1012 return true;
1013 }
1014 }
1015 } break;
1017 case JVM_CONSTANT_StringIndex:
1018 {
1019 int recur1 = string_index_at(index1);
1020 int recur2 = cp2->string_index_at(index2);
1021 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1022 if (match) {
1023 return true;
1024 }
1025 } break;
1027 case JVM_CONSTANT_UnresolvedClass:
1028 {
1029 Symbol* k1 = unresolved_klass_at(index1);
1030 Symbol* k2 = cp2->unresolved_klass_at(index2);
1031 if (k1 == k2) {
1032 return true;
1033 }
1034 } break;
1036 case JVM_CONSTANT_MethodType:
1037 {
1038 int k1 = method_type_index_at(index1);
1039 int k2 = cp2->method_type_index_at(index2);
1040 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1041 if (match) {
1042 return true;
1043 }
1044 } break;
1046 case JVM_CONSTANT_MethodHandle:
1047 {
1048 int k1 = method_handle_ref_kind_at(index1);
1049 int k2 = cp2->method_handle_ref_kind_at(index2);
1050 if (k1 == k2) {
1051 int i1 = method_handle_index_at(index1);
1052 int i2 = cp2->method_handle_index_at(index2);
1053 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1054 if (match) {
1055 return true;
1056 }
1057 }
1058 } break;
1060 case JVM_CONSTANT_InvokeDynamic:
1061 {
1062 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
1063 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
1064 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1065 if (!match) return false;
1066 k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1067 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1068 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1069 if (!match) return false;
1070 int argc = invoke_dynamic_argument_count_at(index1);
1071 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) {
1072 for (int j = 0; j < argc; j++) {
1073 k1 = invoke_dynamic_argument_index_at(index1, j);
1074 k2 = cp2->invoke_dynamic_argument_index_at(index2, j);
1075 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1076 if (!match) return false;
1077 }
1078 return true; // got through loop; all elements equal
1079 }
1080 } break;
1082 case JVM_CONSTANT_String:
1083 {
1084 Symbol* s1 = unresolved_string_at(index1);
1085 Symbol* s2 = cp2->unresolved_string_at(index2);
1086 if (s1 == s2) {
1087 return true;
1088 }
1089 } break;
1091 case JVM_CONSTANT_Utf8:
1092 {
1093 Symbol* s1 = symbol_at(index1);
1094 Symbol* s2 = cp2->symbol_at(index2);
1095 if (s1 == s2) {
1096 return true;
1097 }
1098 } break;
1100 // Invalid is used as the tag for the second constant pool entry
1101 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1102 // not be seen by itself.
1103 case JVM_CONSTANT_Invalid: // fall through
1105 default:
1106 ShouldNotReachHere();
1107 break;
1108 }
1110 return false;
1111 } // end compare_entry_to()
1114 // Copy this constant pool's entries at start_i to end_i (inclusive)
1115 // to the constant pool to_cp's entries starting at to_i. A total of
1116 // (end_i - start_i) + 1 entries are copied.
1117 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1118 constantPoolHandle to_cp, int to_i, TRAPS) {
1120 int dest_i = to_i; // leave original alone for debug purposes
1122 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1123 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1125 switch (from_cp->tag_at(src_i).value()) {
1126 case JVM_CONSTANT_Double:
1127 case JVM_CONSTANT_Long:
1128 // double and long take two constant pool entries
1129 src_i += 2;
1130 dest_i += 2;
1131 break;
1133 default:
1134 // all others take one constant pool entry
1135 src_i++;
1136 dest_i++;
1137 break;
1138 }
1139 }
1141 int from_oplen = operand_array_length(from_cp->operands());
1142 int old_oplen = operand_array_length(to_cp->operands());
1143 if (from_oplen != 0) {
1144 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1145 // append my operands to the target's operands array
1146 if (old_oplen == 0) {
1147 // Can't just reuse from_cp's operand list because of deallocation issues
1148 int len = from_cp->operands()->length();
1149 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1150 Copy::conjoint_memory_atomic(
1151 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1152 to_cp->set_operands(new_ops);
1153 } else {
1154 int old_len = to_cp->operands()->length();
1155 int from_len = from_cp->operands()->length();
1156 int old_off = old_oplen * sizeof(u2);
1157 int from_off = from_oplen * sizeof(u2);
1158 // Use the metaspace for the destination constant pool
1159 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1160 int fillp = 0, len = 0;
1161 // first part of dest
1162 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1163 new_operands->adr_at(fillp),
1164 (len = old_off) * sizeof(u2));
1165 fillp += len;
1166 // first part of src
1167 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1168 new_operands->adr_at(fillp),
1169 (len = from_off) * sizeof(u2));
1170 fillp += len;
1171 // second part of dest
1172 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1173 new_operands->adr_at(fillp),
1174 (len = old_len - old_off) * sizeof(u2));
1175 fillp += len;
1176 // second part of src
1177 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(from_off),
1178 new_operands->adr_at(fillp),
1179 (len = from_len - from_off) * sizeof(u2));
1180 fillp += len;
1181 assert(fillp == new_operands->length(), "");
1183 // Adjust indexes in the first part of the copied operands array.
1184 for (int j = 0; j < from_oplen; j++) {
1185 int offset = operand_offset_at(new_operands, old_oplen + j);
1186 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1187 offset += old_len; // every new tuple is preceded by old_len extra u2's
1188 operand_offset_at_put(new_operands, old_oplen + j, offset);
1189 }
1191 // replace target operands array with combined array
1192 to_cp->set_operands(new_operands);
1193 }
1194 }
1196 } // end copy_cp_to()
1199 // Copy this constant pool's entry at from_i to the constant pool
1200 // to_cp's entry at to_i.
1201 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1202 constantPoolHandle to_cp, int to_i,
1203 TRAPS) {
1205 int tag = from_cp->tag_at(from_i).value();
1206 switch (tag) {
1207 case JVM_CONSTANT_Class:
1208 {
1209 Klass* k = from_cp->klass_at(from_i, CHECK);
1210 to_cp->klass_at_put(to_i, k);
1211 } break;
1213 case JVM_CONSTANT_ClassIndex:
1214 {
1215 jint ki = from_cp->klass_index_at(from_i);
1216 to_cp->klass_index_at_put(to_i, ki);
1217 } break;
1219 case JVM_CONSTANT_Double:
1220 {
1221 jdouble d = from_cp->double_at(from_i);
1222 to_cp->double_at_put(to_i, d);
1223 // double takes two constant pool entries so init second entry's tag
1224 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1225 } break;
1227 case JVM_CONSTANT_Fieldref:
1228 {
1229 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1230 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1231 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1232 } break;
1234 case JVM_CONSTANT_Float:
1235 {
1236 jfloat f = from_cp->float_at(from_i);
1237 to_cp->float_at_put(to_i, f);
1238 } break;
1240 case JVM_CONSTANT_Integer:
1241 {
1242 jint i = from_cp->int_at(from_i);
1243 to_cp->int_at_put(to_i, i);
1244 } break;
1246 case JVM_CONSTANT_InterfaceMethodref:
1247 {
1248 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1249 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1250 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1251 } break;
1253 case JVM_CONSTANT_Long:
1254 {
1255 jlong l = from_cp->long_at(from_i);
1256 to_cp->long_at_put(to_i, l);
1257 // long takes two constant pool entries so init second entry's tag
1258 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1259 } break;
1261 case JVM_CONSTANT_Methodref:
1262 {
1263 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1264 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1265 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1266 } break;
1268 case JVM_CONSTANT_NameAndType:
1269 {
1270 int name_ref_index = from_cp->name_ref_index_at(from_i);
1271 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1272 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1273 } break;
1275 case JVM_CONSTANT_StringIndex:
1276 {
1277 jint si = from_cp->string_index_at(from_i);
1278 to_cp->string_index_at_put(to_i, si);
1279 } break;
1281 case JVM_CONSTANT_UnresolvedClass:
1282 {
1283 // Can be resolved after checking tag, so check the slot first.
1284 CPSlot entry = from_cp->slot_at(from_i);
1285 if (entry.is_resolved()) {
1286 assert(entry.get_klass()->is_klass(), "must be");
1287 // Already resolved
1288 to_cp->klass_at_put(to_i, entry.get_klass());
1289 } else {
1290 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1291 }
1292 } break;
1294 case JVM_CONSTANT_UnresolvedClassInError:
1295 {
1296 Symbol* k = from_cp->unresolved_klass_at(from_i);
1297 to_cp->unresolved_klass_at_put(to_i, k);
1298 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1299 } break;
1302 case JVM_CONSTANT_String:
1303 {
1304 Symbol* s = from_cp->unresolved_string_at(from_i);
1305 to_cp->unresolved_string_at_put(to_i, s);
1306 } break;
1308 case JVM_CONSTANT_Utf8:
1309 {
1310 Symbol* s = from_cp->symbol_at(from_i);
1311 // Need to increase refcount, the old one will be thrown away and deferenced
1312 s->increment_refcount();
1313 to_cp->symbol_at_put(to_i, s);
1314 } break;
1316 case JVM_CONSTANT_MethodType:
1317 {
1318 jint k = from_cp->method_type_index_at(from_i);
1319 to_cp->method_type_index_at_put(to_i, k);
1320 } break;
1322 case JVM_CONSTANT_MethodHandle:
1323 {
1324 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1325 int k2 = from_cp->method_handle_index_at(from_i);
1326 to_cp->method_handle_index_at_put(to_i, k1, k2);
1327 } break;
1329 case JVM_CONSTANT_InvokeDynamic:
1330 {
1331 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1332 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1333 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1334 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1335 } break;
1337 // Invalid is used as the tag for the second constant pool entry
1338 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1339 // not be seen by itself.
1340 case JVM_CONSTANT_Invalid: // fall through
1342 default:
1343 {
1344 ShouldNotReachHere();
1345 } break;
1346 }
1347 } // end copy_entry_to()
1350 // Search constant pool search_cp for an entry that matches this
1351 // constant pool's entry at pattern_i. Returns the index of a
1352 // matching entry or zero (0) if there is no matching entry.
1353 int ConstantPool::find_matching_entry(int pattern_i,
1354 constantPoolHandle search_cp, TRAPS) {
1356 // index zero (0) is not used
1357 for (int i = 1; i < search_cp->length(); i++) {
1358 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1359 if (found) {
1360 return i;
1361 }
1362 }
1364 return 0; // entry not found; return unused index zero (0)
1365 } // end find_matching_entry()
1368 #ifndef PRODUCT
1370 const char* ConstantPool::printable_name_at(int which) {
1372 constantTag tag = tag_at(which);
1374 if (tag.is_string()) {
1375 return string_at_noresolve(which);
1376 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1377 return klass_name_at(which)->as_C_string();
1378 } else if (tag.is_symbol()) {
1379 return symbol_at(which)->as_C_string();
1380 }
1381 return "";
1382 }
1384 #endif // PRODUCT
1387 // JVMTI GetConstantPool support
1389 // For temporary use until code is stable.
1390 #define DBG(code)
1392 static const char* WARN_MSG = "Must not be such entry!";
1394 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1395 jint size = 0;
1396 u2 idx1, idx2;
1398 for (jint idx = 1; idx < cnt; idx++) {
1399 jint ent_size = 0;
1400 u1 tag = *bytes++;
1401 size++; // count tag
1403 printf("const #%03d, tag: %02d ", idx, tag);
1404 switch(tag) {
1405 case JVM_CONSTANT_Invalid: {
1406 printf("Invalid");
1407 break;
1408 }
1409 case JVM_CONSTANT_Unicode: {
1410 printf("Unicode %s", WARN_MSG);
1411 break;
1412 }
1413 case JVM_CONSTANT_Utf8: {
1414 u2 len = Bytes::get_Java_u2(bytes);
1415 char str[128];
1416 if (len > 127) {
1417 len = 127;
1418 }
1419 strncpy(str, (char *) (bytes+2), len);
1420 str[len] = '\0';
1421 printf("Utf8 \"%s\"", str);
1422 ent_size = 2 + len;
1423 break;
1424 }
1425 case JVM_CONSTANT_Integer: {
1426 u4 val = Bytes::get_Java_u4(bytes);
1427 printf("int %d", *(int *) &val);
1428 ent_size = 4;
1429 break;
1430 }
1431 case JVM_CONSTANT_Float: {
1432 u4 val = Bytes::get_Java_u4(bytes);
1433 printf("float %5.3ff", *(float *) &val);
1434 ent_size = 4;
1435 break;
1436 }
1437 case JVM_CONSTANT_Long: {
1438 u8 val = Bytes::get_Java_u8(bytes);
1439 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1440 ent_size = 8;
1441 idx++; // Long takes two cpool slots
1442 break;
1443 }
1444 case JVM_CONSTANT_Double: {
1445 u8 val = Bytes::get_Java_u8(bytes);
1446 printf("double %5.3fd", *(jdouble *)&val);
1447 ent_size = 8;
1448 idx++; // Double takes two cpool slots
1449 break;
1450 }
1451 case JVM_CONSTANT_Class: {
1452 idx1 = Bytes::get_Java_u2(bytes);
1453 printf("class #%03d", idx1);
1454 ent_size = 2;
1455 break;
1456 }
1457 case JVM_CONSTANT_String: {
1458 idx1 = Bytes::get_Java_u2(bytes);
1459 printf("String #%03d", idx1);
1460 ent_size = 2;
1461 break;
1462 }
1463 case JVM_CONSTANT_Fieldref: {
1464 idx1 = Bytes::get_Java_u2(bytes);
1465 idx2 = Bytes::get_Java_u2(bytes+2);
1466 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1467 ent_size = 4;
1468 break;
1469 }
1470 case JVM_CONSTANT_Methodref: {
1471 idx1 = Bytes::get_Java_u2(bytes);
1472 idx2 = Bytes::get_Java_u2(bytes+2);
1473 printf("Method #%03d, #%03d", idx1, idx2);
1474 ent_size = 4;
1475 break;
1476 }
1477 case JVM_CONSTANT_InterfaceMethodref: {
1478 idx1 = Bytes::get_Java_u2(bytes);
1479 idx2 = Bytes::get_Java_u2(bytes+2);
1480 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1481 ent_size = 4;
1482 break;
1483 }
1484 case JVM_CONSTANT_NameAndType: {
1485 idx1 = Bytes::get_Java_u2(bytes);
1486 idx2 = Bytes::get_Java_u2(bytes+2);
1487 printf("NameAndType #%03d, #%03d", idx1, idx2);
1488 ent_size = 4;
1489 break;
1490 }
1491 case JVM_CONSTANT_ClassIndex: {
1492 printf("ClassIndex %s", WARN_MSG);
1493 break;
1494 }
1495 case JVM_CONSTANT_UnresolvedClass: {
1496 printf("UnresolvedClass: %s", WARN_MSG);
1497 break;
1498 }
1499 case JVM_CONSTANT_UnresolvedClassInError: {
1500 printf("UnresolvedClassInErr: %s", WARN_MSG);
1501 break;
1502 }
1503 case JVM_CONSTANT_StringIndex: {
1504 printf("StringIndex: %s", WARN_MSG);
1505 break;
1506 }
1507 }
1508 printf(";\n");
1509 bytes += ent_size;
1510 size += ent_size;
1511 }
1512 printf("Cpool size: %d\n", size);
1513 fflush(0);
1514 return;
1515 } /* end print_cpool_bytes */
1518 // Returns size of constant pool entry.
1519 jint ConstantPool::cpool_entry_size(jint idx) {
1520 switch(tag_at(idx).value()) {
1521 case JVM_CONSTANT_Invalid:
1522 case JVM_CONSTANT_Unicode:
1523 return 1;
1525 case JVM_CONSTANT_Utf8:
1526 return 3 + symbol_at(idx)->utf8_length();
1528 case JVM_CONSTANT_Class:
1529 case JVM_CONSTANT_String:
1530 case JVM_CONSTANT_ClassIndex:
1531 case JVM_CONSTANT_UnresolvedClass:
1532 case JVM_CONSTANT_UnresolvedClassInError:
1533 case JVM_CONSTANT_StringIndex:
1534 case JVM_CONSTANT_MethodType:
1535 return 3;
1537 case JVM_CONSTANT_MethodHandle:
1538 return 4; //tag, ref_kind, ref_index
1540 case JVM_CONSTANT_Integer:
1541 case JVM_CONSTANT_Float:
1542 case JVM_CONSTANT_Fieldref:
1543 case JVM_CONSTANT_Methodref:
1544 case JVM_CONSTANT_InterfaceMethodref:
1545 case JVM_CONSTANT_NameAndType:
1546 return 5;
1548 case JVM_CONSTANT_InvokeDynamic:
1549 // u1 tag, u2 bsm, u2 nt
1550 return 5;
1552 case JVM_CONSTANT_Long:
1553 case JVM_CONSTANT_Double:
1554 return 9;
1555 }
1556 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1557 return 1;
1558 } /* end cpool_entry_size */
1561 // SymbolHashMap is used to find a constant pool index from a string.
1562 // This function fills in SymbolHashMaps, one for utf8s and one for
1563 // class names, returns size of the cpool raw bytes.
1564 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1565 SymbolHashMap *classmap) {
1566 jint size = 0;
1568 for (u2 idx = 1; idx < length(); idx++) {
1569 u2 tag = tag_at(idx).value();
1570 size += cpool_entry_size(idx);
1572 switch(tag) {
1573 case JVM_CONSTANT_Utf8: {
1574 Symbol* sym = symbol_at(idx);
1575 symmap->add_entry(sym, idx);
1576 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1577 break;
1578 }
1579 case JVM_CONSTANT_Class:
1580 case JVM_CONSTANT_UnresolvedClass:
1581 case JVM_CONSTANT_UnresolvedClassInError: {
1582 Symbol* sym = klass_name_at(idx);
1583 classmap->add_entry(sym, idx);
1584 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1585 break;
1586 }
1587 case JVM_CONSTANT_Long:
1588 case JVM_CONSTANT_Double: {
1589 idx++; // Both Long and Double take two cpool slots
1590 break;
1591 }
1592 }
1593 }
1594 return size;
1595 } /* end hash_utf8_entries_to */
1598 // Copy cpool bytes.
1599 // Returns:
1600 // 0, in case of OutOfMemoryError
1601 // -1, in case of internal error
1602 // > 0, count of the raw cpool bytes that have been copied
1603 int ConstantPool::copy_cpool_bytes(int cpool_size,
1604 SymbolHashMap* tbl,
1605 unsigned char *bytes) {
1606 u2 idx1, idx2;
1607 jint size = 0;
1608 jint cnt = length();
1609 unsigned char *start_bytes = bytes;
1611 for (jint idx = 1; idx < cnt; idx++) {
1612 u1 tag = tag_at(idx).value();
1613 jint ent_size = cpool_entry_size(idx);
1615 assert(size + ent_size <= cpool_size, "Size mismatch");
1617 *bytes = tag;
1618 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1619 switch(tag) {
1620 case JVM_CONSTANT_Invalid: {
1621 DBG(printf("JVM_CONSTANT_Invalid"));
1622 break;
1623 }
1624 case JVM_CONSTANT_Unicode: {
1625 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1626 DBG(printf("JVM_CONSTANT_Unicode"));
1627 break;
1628 }
1629 case JVM_CONSTANT_Utf8: {
1630 Symbol* sym = symbol_at(idx);
1631 char* str = sym->as_utf8();
1632 // Warning! It's crashing on x86 with len = sym->utf8_length()
1633 int len = (int) strlen(str);
1634 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1635 for (int i = 0; i < len; i++) {
1636 bytes[3+i] = (u1) str[i];
1637 }
1638 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1639 break;
1640 }
1641 case JVM_CONSTANT_Integer: {
1642 jint val = int_at(idx);
1643 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1644 break;
1645 }
1646 case JVM_CONSTANT_Float: {
1647 jfloat val = float_at(idx);
1648 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1649 break;
1650 }
1651 case JVM_CONSTANT_Long: {
1652 jlong val = long_at(idx);
1653 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1654 idx++; // Long takes two cpool slots
1655 break;
1656 }
1657 case JVM_CONSTANT_Double: {
1658 jdouble val = double_at(idx);
1659 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1660 idx++; // Double takes two cpool slots
1661 break;
1662 }
1663 case JVM_CONSTANT_Class:
1664 case JVM_CONSTANT_UnresolvedClass:
1665 case JVM_CONSTANT_UnresolvedClassInError: {
1666 *bytes = JVM_CONSTANT_Class;
1667 Symbol* sym = klass_name_at(idx);
1668 idx1 = tbl->symbol_to_value(sym);
1669 assert(idx1 != 0, "Have not found a hashtable entry");
1670 Bytes::put_Java_u2((address) (bytes+1), idx1);
1671 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1672 break;
1673 }
1674 case JVM_CONSTANT_String: {
1675 *bytes = JVM_CONSTANT_String;
1676 Symbol* sym = unresolved_string_at(idx);
1677 idx1 = tbl->symbol_to_value(sym);
1678 assert(idx1 != 0, "Have not found a hashtable entry");
1679 Bytes::put_Java_u2((address) (bytes+1), idx1);
1680 DBG(char *str = sym->as_utf8());
1681 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
1682 break;
1683 }
1684 case JVM_CONSTANT_Fieldref:
1685 case JVM_CONSTANT_Methodref:
1686 case JVM_CONSTANT_InterfaceMethodref: {
1687 idx1 = uncached_klass_ref_index_at(idx);
1688 idx2 = uncached_name_and_type_ref_index_at(idx);
1689 Bytes::put_Java_u2((address) (bytes+1), idx1);
1690 Bytes::put_Java_u2((address) (bytes+3), idx2);
1691 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1692 break;
1693 }
1694 case JVM_CONSTANT_NameAndType: {
1695 idx1 = name_ref_index_at(idx);
1696 idx2 = signature_ref_index_at(idx);
1697 Bytes::put_Java_u2((address) (bytes+1), idx1);
1698 Bytes::put_Java_u2((address) (bytes+3), idx2);
1699 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1700 break;
1701 }
1702 case JVM_CONSTANT_ClassIndex: {
1703 *bytes = JVM_CONSTANT_Class;
1704 idx1 = klass_index_at(idx);
1705 Bytes::put_Java_u2((address) (bytes+1), idx1);
1706 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1707 break;
1708 }
1709 case JVM_CONSTANT_StringIndex: {
1710 *bytes = JVM_CONSTANT_String;
1711 idx1 = string_index_at(idx);
1712 Bytes::put_Java_u2((address) (bytes+1), idx1);
1713 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1714 break;
1715 }
1716 case JVM_CONSTANT_MethodHandle:
1717 case JVM_CONSTANT_MethodHandleInError: {
1718 *bytes = JVM_CONSTANT_MethodHandle;
1719 int kind = method_handle_ref_kind_at(idx);
1720 idx1 = method_handle_index_at(idx);
1721 *(bytes+1) = (unsigned char) kind;
1722 Bytes::put_Java_u2((address) (bytes+2), idx1);
1723 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1724 break;
1725 }
1726 case JVM_CONSTANT_MethodType:
1727 case JVM_CONSTANT_MethodTypeInError: {
1728 *bytes = JVM_CONSTANT_MethodType;
1729 idx1 = method_type_index_at(idx);
1730 Bytes::put_Java_u2((address) (bytes+1), idx1);
1731 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1732 break;
1733 }
1734 case JVM_CONSTANT_InvokeDynamic: {
1735 *bytes = tag;
1736 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1737 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1738 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1739 Bytes::put_Java_u2((address) (bytes+1), idx1);
1740 Bytes::put_Java_u2((address) (bytes+3), idx2);
1741 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1742 break;
1743 }
1744 }
1745 DBG(printf("\n"));
1746 bytes += ent_size;
1747 size += ent_size;
1748 }
1749 assert(size == cpool_size, "Size mismatch");
1751 // Keep temorarily for debugging until it's stable.
1752 DBG(print_cpool_bytes(cnt, start_bytes));
1753 return (int)(bytes - start_bytes);
1754 } /* end copy_cpool_bytes */
1757 void ConstantPool::set_on_stack(const bool value) {
1758 _on_stack = value;
1759 if (value) MetadataOnStackMark::record(this);
1760 }
1762 // JSR 292 support for patching constant pool oops after the class is linked and
1763 // the oop array for resolved references are created.
1764 // We can't do this during classfile parsing, which is how the other indexes are
1765 // patched. The other patches are applied early for some error checking
1766 // so only defer the pseudo_strings.
1767 void ConstantPool::patch_resolved_references(
1768 GrowableArray<Handle>* cp_patches) {
1769 assert(EnableInvokeDynamic, "");
1770 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1771 Handle patch = cp_patches->at(index);
1772 if (patch.not_null()) {
1773 assert (tag_at(index).is_string(), "should only be string left");
1774 // Patching a string means pre-resolving it.
1775 // The spelling in the constant pool is ignored.
1776 // The constant reference may be any object whatever.
1777 // If it is not a real interned string, the constant is referred
1778 // to as a "pseudo-string", and must be presented to the CP
1779 // explicitly, because it may require scavenging.
1780 int obj_index = cp_to_object_index(index);
1781 pseudo_string_at_put(index, obj_index, patch());
1782 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1783 }
1784 }
1785 #ifdef ASSERT
1786 // Ensure that all the patches have been used.
1787 for (int index = 0; index < cp_patches->length(); index++) {
1788 assert(cp_patches->at(index).is_null(),
1789 err_msg("Unused constant pool patch at %d in class file %s",
1790 index,
1791 pool_holder()->external_name()));
1792 }
1793 #endif // ASSERT
1794 }
1796 #ifndef PRODUCT
1798 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1799 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1800 guarantee(obj->is_constantPool(), "object must be constant pool");
1801 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1802 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1804 for (int i = 0; i< cp->length(); i++) {
1805 if (cp->tag_at(i).is_unresolved_klass()) {
1806 // This will force loading of the class
1807 Klass* klass = cp->klass_at(i, CHECK);
1808 if (klass->oop_is_instance()) {
1809 // Force initialization of class
1810 InstanceKlass::cast(klass)->initialize(CHECK);
1811 }
1812 }
1813 }
1814 }
1816 #endif
1819 // Printing
1821 void ConstantPool::print_on(outputStream* st) const {
1822 EXCEPTION_MARK;
1823 assert(is_constantPool(), "must be constantPool");
1824 st->print_cr(internal_name());
1825 if (flags() != 0) {
1826 st->print(" - flags: 0x%x", flags());
1827 if (has_pseudo_string()) st->print(" has_pseudo_string");
1828 if (has_invokedynamic()) st->print(" has_invokedynamic");
1829 if (has_preresolution()) st->print(" has_preresolution");
1830 st->cr();
1831 }
1832 if (pool_holder() != NULL) {
1833 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
1834 }
1835 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
1836 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references());
1837 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
1839 for (int index = 1; index < length(); index++) { // Index 0 is unused
1840 ((ConstantPool*)this)->print_entry_on(index, st);
1841 switch (tag_at(index).value()) {
1842 case JVM_CONSTANT_Long :
1843 case JVM_CONSTANT_Double :
1844 index++; // Skip entry following eigth-byte constant
1845 }
1847 }
1848 st->cr();
1849 }
1851 // Print one constant pool entry
1852 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1853 EXCEPTION_MARK;
1854 st->print(" - %3d : ", index);
1855 tag_at(index).print_on(st);
1856 st->print(" : ");
1857 switch (tag_at(index).value()) {
1858 case JVM_CONSTANT_Class :
1859 { Klass* k = klass_at(index, CATCH);
1860 k->print_value_on(st);
1861 st->print(" {0x%lx}", (address)k);
1862 }
1863 break;
1864 case JVM_CONSTANT_Fieldref :
1865 case JVM_CONSTANT_Methodref :
1866 case JVM_CONSTANT_InterfaceMethodref :
1867 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1868 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1869 break;
1870 case JVM_CONSTANT_String :
1871 unresolved_string_at(index)->print_value_on(st);
1872 break;
1873 case JVM_CONSTANT_Object : {
1874 oop anObj = object_at(index);
1875 anObj->print_value_on(st);
1876 st->print(" {0x%lx}", (address)anObj);
1877 } break;
1878 case JVM_CONSTANT_Integer :
1879 st->print("%d", int_at(index));
1880 break;
1881 case JVM_CONSTANT_Float :
1882 st->print("%f", float_at(index));
1883 break;
1884 case JVM_CONSTANT_Long :
1885 st->print_jlong(long_at(index));
1886 break;
1887 case JVM_CONSTANT_Double :
1888 st->print("%lf", double_at(index));
1889 break;
1890 case JVM_CONSTANT_NameAndType :
1891 st->print("name_index=%d", name_ref_index_at(index));
1892 st->print(" signature_index=%d", signature_ref_index_at(index));
1893 break;
1894 case JVM_CONSTANT_Utf8 :
1895 symbol_at(index)->print_value_on(st);
1896 break;
1897 case JVM_CONSTANT_UnresolvedClass : // fall-through
1898 case JVM_CONSTANT_UnresolvedClassInError: {
1899 // unresolved_klass_at requires lock or safe world.
1900 CPSlot entry = slot_at(index);
1901 if (entry.is_resolved()) {
1902 entry.get_klass()->print_value_on(st);
1903 } else {
1904 entry.get_symbol()->print_value_on(st);
1905 }
1906 }
1907 break;
1908 case JVM_CONSTANT_MethodHandle :
1909 case JVM_CONSTANT_MethodHandleInError :
1910 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
1911 st->print(" ref_index=%d", method_handle_index_at(index));
1912 break;
1913 case JVM_CONSTANT_MethodType :
1914 case JVM_CONSTANT_MethodTypeInError :
1915 st->print("signature_index=%d", method_type_index_at(index));
1916 break;
1917 case JVM_CONSTANT_InvokeDynamic :
1918 {
1919 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1920 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1921 int argc = invoke_dynamic_argument_count_at(index);
1922 if (argc > 0) {
1923 for (int arg_i = 0; arg_i < argc; arg_i++) {
1924 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1925 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1926 }
1927 st->print("}");
1928 }
1929 }
1930 break;
1931 default:
1932 ShouldNotReachHere();
1933 break;
1934 }
1935 st->cr();
1936 }
1938 void ConstantPool::print_value_on(outputStream* st) const {
1939 assert(is_constantPool(), "must be constantPool");
1940 st->print("constant pool [%d]", length());
1941 if (has_pseudo_string()) st->print("/pseudo_string");
1942 if (has_invokedynamic()) st->print("/invokedynamic");
1943 if (has_preresolution()) st->print("/preresolution");
1944 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
1945 print_address_on(st);
1946 st->print(" for ");
1947 pool_holder()->print_value_on(st);
1948 if (pool_holder() != NULL) {
1949 bool extra = (pool_holder()->constants() != this);
1950 if (extra) st->print(" (extra)");
1951 }
1952 if (cache() != NULL) {
1953 st->print(" cache=" PTR_FORMAT, cache());
1954 }
1955 }
1958 // Verification
1960 void ConstantPool::verify_on(outputStream* st) {
1961 guarantee(is_constantPool(), "object must be constant pool");
1962 for (int i = 0; i< length(); i++) {
1963 constantTag tag = tag_at(i);
1964 CPSlot entry = slot_at(i);
1965 if (tag.is_klass()) {
1966 if (entry.is_resolved()) {
1967 guarantee(entry.get_klass()->is_metadata(), "should be metadata");
1968 guarantee(entry.get_klass()->is_klass(), "should be klass");
1969 }
1970 } else if (tag.is_unresolved_klass()) {
1971 if (entry.is_resolved()) {
1972 guarantee(entry.get_klass()->is_metadata(), "should be metadata");
1973 guarantee(entry.get_klass()->is_klass(), "should be klass");
1974 }
1975 } else if (tag.is_symbol()) {
1976 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
1977 } else if (tag.is_string()) {
1978 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
1979 }
1980 }
1981 if (cache() != NULL) {
1982 // Note: cache() can be NULL before a class is completely setup or
1983 // in temporary constant pools used during constant pool merging
1984 guarantee(cache()->is_metadata(), "should be metadata");
1985 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
1986 }
1987 if (pool_holder() != NULL) {
1988 // Note: pool_holder() can be NULL in temporary constant pools
1989 // used during constant pool merging
1990 guarantee(pool_holder()->is_metadata(), "should be metadata");
1991 guarantee(pool_holder()->is_klass(), "should be klass");
1992 }
1993 }
1996 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
1997 char *str = sym->as_utf8();
1998 unsigned int hash = compute_hash(str, sym->utf8_length());
1999 unsigned int index = hash % table_size();
2001 // check if already in map
2002 // we prefer the first entry since it is more likely to be what was used in
2003 // the class file
2004 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2005 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2006 if (en->hash() == hash && en->symbol() == sym) {
2007 return; // already there
2008 }
2009 }
2011 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2012 entry->set_next(bucket(index));
2013 _buckets[index].set_entry(entry);
2014 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2015 }
2017 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2018 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2019 char *str = sym->as_utf8();
2020 int len = sym->utf8_length();
2021 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2022 unsigned int index = hash % table_size();
2023 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2024 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2025 if (en->hash() == hash && en->symbol() == sym) {
2026 return en;
2027 }
2028 }
2029 return NULL;
2030 }