1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotConstantPoolResolver.hpp"
26 #include "cds/archiveBuilder.hpp"
27 #include "cds/archiveHeapLoader.hpp"
28 #include "cds/archiveHeapWriter.hpp"
29 #include "cds/cdsConfig.hpp"
30 #include "cds/heapShared.hpp"
31 #include "classfile/classLoader.hpp"
32 #include "classfile/classLoaderData.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/metadataOnStackMark.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/systemDictionaryShared.hpp"
38 #include "classfile/vmClasses.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "code/codeCache.hpp"
41 #include "interpreter/bootstrapInfo.hpp"
42 #include "interpreter/linkResolver.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/metaspaceClosure.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/array.hpp"
53 #include "oops/constantPool.inline.hpp"
54 #include "oops/cpCache.inline.hpp"
55 #include "oops/fieldStreams.inline.hpp"
56 #include "oops/instanceKlass.hpp"
57 #include "oops/klass.inline.hpp"
58 #include "oops/objArrayKlass.hpp"
59 #include "oops/objArrayOop.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/typeArrayOop.inline.hpp"
62 #include "prims/jvmtiExport.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/fieldDescriptor.inline.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/init.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/javaThread.inline.hpp"
69 #include "runtime/perfData.hpp"
70 #include "runtime/signature.hpp"
71 #include "runtime/vframe.inline.hpp"
72 #include "utilities/checkedCast.hpp"
73 #include "utilities/copy.hpp"
74
75 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
76 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
77 int size = ConstantPool::size(length);
78 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
79 }
80
81 void ConstantPool::copy_fields(const ConstantPool* orig) {
82 // Preserve dynamic constant information from the original pool
83 if (orig->has_dynamic_constant()) {
84 set_has_dynamic_constant();
85 }
86
87 set_major_version(orig->major_version());
88 set_minor_version(orig->minor_version());
89
90 set_source_file_name_index(orig->source_file_name_index());
91 set_generic_signature_index(orig->generic_signature_index());
92 }
93
94 #ifdef ASSERT
95
96 // MetaspaceObj allocation invariant is calloc equivalent memory
97 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
98 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
99 assert(tags != nullptr, "invariant");
100 const int length = tags->length();
101 for (int index = 0; index < length; ++index) {
102 if (JVM_CONSTANT_Invalid != tags->at(index)) {
103 return false;
104 }
105 }
106 return true;
107 }
108
109 #endif
110
111 ConstantPool::ConstantPool() {
112 assert(CDSConfig::is_dumping_static_archive() || CDSConfig::is_using_archive(), "only for CDS");
113 }
114
115 ConstantPool::ConstantPool(Array<u1>* tags) :
116 _tags(tags),
117 _length(tags->length()) {
118
119 assert(_tags != nullptr, "invariant");
120 assert(tags->length() == _length, "invariant");
121 assert(tag_array_is_zero_initialized(tags), "invariant");
122 assert(0 == flags(), "invariant");
123 assert(0 == version(), "invariant");
124 assert(nullptr == _pool_holder, "invariant");
125 }
126
127 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
128 if (cache() != nullptr) {
129 MetadataFactory::free_metadata(loader_data, cache());
130 set_cache(nullptr);
131 }
132
133 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
134 set_resolved_klasses(nullptr);
135
136 MetadataFactory::free_array<jushort>(loader_data, operands());
137 set_operands(nullptr);
138
139 release_C_heap_structures();
140
141 // free tag array
142 MetadataFactory::free_array<u1>(loader_data, tags());
143 set_tags(nullptr);
144 }
145
146 void ConstantPool::release_C_heap_structures() {
147 // walk constant pool and decrement symbol reference counts
148 unreference_symbols();
149 }
150
151 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
152 log_trace(aot)("Iter(ConstantPool): %p", this);
153
154 it->push(&_tags, MetaspaceClosure::_writable);
155 it->push(&_cache);
156 it->push(&_pool_holder);
157 it->push(&_operands);
158 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
159
160 for (int i = 0; i < length(); i++) {
161 // The only MSO's embedded in the CP entries are Symbols:
162 // JVM_CONSTANT_String
163 // JVM_CONSTANT_Utf8
164 constantTag ctag = tag_at(i);
165 if (ctag.is_string() || ctag.is_utf8()) {
166 it->push(symbol_at_addr(i));
167 }
168 }
169 }
170
171 objArrayOop ConstantPool::resolved_references() const {
172 return _cache->resolved_references();
173 }
174
175 // Called from outside constant pool resolution where a resolved_reference array
176 // may not be present.
177 objArrayOop ConstantPool::resolved_references_or_null() const {
178 if (_cache == nullptr) {
179 return nullptr;
180 } else {
181 return _cache->resolved_references();
182 }
183 }
184
185 oop ConstantPool::resolved_reference_at(int index) const {
186 oop result = resolved_references()->obj_at(index);
187 assert(oopDesc::is_oop_or_null(result), "Must be oop");
188 return result;
189 }
190
191 // Use a CAS for multithreaded access
192 oop ConstantPool::set_resolved_reference_at(int index, oop new_result) {
193 assert(oopDesc::is_oop_or_null(new_result), "Must be oop");
194 return resolved_references()->replace_if_null(index, new_result);
195 }
196
197 // Create resolved_references array and mapping array for original cp indexes
198 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
199 // to map it back for resolving and some unlikely miscellaneous uses.
200 // The objects created by invokedynamic are appended to this list.
201 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
202 const intStack& reference_map,
203 int constant_pool_map_length,
204 TRAPS) {
205 // Initialized the resolved object cache.
206 int map_length = reference_map.length();
207 if (map_length > 0) {
208 // Only need mapping back to constant pool entries. The map isn't used for
209 // invokedynamic resolved_reference entries. For invokedynamic entries,
210 // the constant pool cache index has the mapping back to both the constant
211 // pool and to the resolved reference index.
212 if (constant_pool_map_length > 0) {
213 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
214
215 for (int i = 0; i < constant_pool_map_length; i++) {
216 int x = reference_map.at(i);
217 assert(x == (int)(jushort) x, "klass index is too big");
218 om->at_put(i, (jushort)x);
219 }
220 set_reference_map(om);
221 }
222
223 // Create Java array for holding resolved strings, methodHandles,
224 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
225 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK);
226 HandleMark hm(THREAD);
227 Handle refs_handle (THREAD, stom); // must handleize.
228 set_resolved_references(loader_data->add_handle(refs_handle));
229
230 // Create a "scratch" copy of the resolved references array to archive
231 if (CDSConfig::is_dumping_heap()) {
232 objArrayOop scratch_references = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK);
233 HeapShared::add_scratch_resolved_references(this, scratch_references);
234 }
235 }
236 }
237
238 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
239 // A ConstantPool can't possibly have 0xffff valid class entries,
240 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
241 // entry for the class's name. So at most we will have 0xfffe class entries.
242 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
243 // UnresolvedKlass entries that are temporarily created during class redefinition.
244 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
245 assert(resolved_klasses() == nullptr, "sanity");
246 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
247 set_resolved_klasses(rk);
248 }
249
250 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
251 int len = length();
252 int num_klasses = 0;
253 for (int i = 1; i <len; i++) {
254 switch (tag_at(i).value()) {
255 case JVM_CONSTANT_ClassIndex:
256 {
257 const int class_index = klass_index_at(i);
258 unresolved_klass_at_put(i, class_index, num_klasses++);
259 }
260 break;
261 #ifndef PRODUCT
262 case JVM_CONSTANT_Class:
263 case JVM_CONSTANT_UnresolvedClass:
264 case JVM_CONSTANT_UnresolvedClassInError:
265 // All of these should have been reverted back to ClassIndex before calling
266 // this function.
267 ShouldNotReachHere();
268 #endif
269 }
270 }
271 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
272 }
273
274 // Hidden class support:
275 void ConstantPool::klass_at_put(int class_index, Klass* k) {
276 assert(k != nullptr, "must be valid klass");
277 CPKlassSlot kslot = klass_slot_at(class_index);
278 int resolved_klass_index = kslot.resolved_klass_index();
279 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
280 Atomic::release_store(adr, k);
281
282 // The interpreter assumes when the tag is stored, the klass is resolved
283 // and the Klass* non-null, so we need hardware store ordering here.
284 release_tag_at_put(class_index, JVM_CONSTANT_Class);
285 }
286
287 #if INCLUDE_CDS_JAVA_HEAP
288 template <typename Function>
289 void ConstantPool::iterate_archivable_resolved_references(Function function) {
290 objArrayOop rr = resolved_references();
291 if (rr != nullptr && cache() != nullptr && CDSConfig::is_dumping_method_handles()) {
292 Array<ResolvedIndyEntry>* indy_entries = cache()->resolved_indy_entries();
293 if (indy_entries != nullptr) {
294 for (int i = 0; i < indy_entries->length(); i++) {
295 ResolvedIndyEntry *rie = indy_entries->adr_at(i);
296 if (rie->is_resolved() && AOTConstantPoolResolver::is_resolution_deterministic(this, rie->constant_pool_index())) {
297 int rr_index = rie->resolved_references_index();
298 assert(resolved_reference_at(rr_index) != nullptr, "must exist");
299 function(rr_index);
300
301 // Save the BSM as well (sometimes the JIT looks up the BSM it for replay)
302 int indy_cp_index = rie->constant_pool_index();
303 int bsm_mh_cp_index = bootstrap_method_ref_index_at(indy_cp_index);
304 int bsm_rr_index = cp_to_object_index(bsm_mh_cp_index);
305 assert(resolved_reference_at(bsm_rr_index) != nullptr, "must exist");
306 function(bsm_rr_index);
307 }
308 }
309 }
310
311 Array<ResolvedMethodEntry>* method_entries = cache()->resolved_method_entries();
312 if (method_entries != nullptr) {
313 for (int i = 0; i < method_entries->length(); i++) {
314 ResolvedMethodEntry* rme = method_entries->adr_at(i);
315 if (rme->is_resolved(Bytecodes::_invokehandle) && rme->has_appendix() &&
316 cache()->can_archive_resolved_method(this, rme)) {
317 int rr_index = rme->resolved_references_index();
318 assert(resolved_reference_at(rr_index) != nullptr, "must exist");
319 function(rr_index);
320 }
321 }
322 }
323 }
324 }
325
326 // Returns the _resolved_reference array after removing unarchivable items from it.
327 // Returns null if this class is not supported, or _resolved_reference doesn't exist.
328 objArrayOop ConstantPool::prepare_resolved_references_for_archiving() {
329 if (_cache == nullptr) {
330 return nullptr; // nothing to do
331 }
332
333 InstanceKlass *ik = pool_holder();
334 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
335 // Archiving resolved references for classes from non-builtin loaders
336 // is not yet supported.
337 return nullptr;
338 }
339
340 objArrayOop rr = resolved_references();
341 if (rr != nullptr) {
342 ResourceMark rm;
343 int rr_len = rr->length();
344 GrowableArray<bool> keep_resolved_refs(rr_len, rr_len, false);
345
346 iterate_archivable_resolved_references([&](int rr_index) {
347 keep_resolved_refs.at_put(rr_index, true);
348 });
349
350 objArrayOop scratch_rr = HeapShared::scratch_resolved_references(this);
351 Array<u2>* ref_map = reference_map();
352 int ref_map_len = ref_map == nullptr ? 0 : ref_map->length();
353 for (int i = 0; i < rr_len; i++) {
354 oop obj = rr->obj_at(i);
355 scratch_rr->obj_at_put(i, nullptr);
356 if (obj != nullptr) {
357 if (i < ref_map_len) {
358 int index = object_to_cp_index(i);
359 if (tag_at(index).is_string()) {
360 assert(java_lang_String::is_instance(obj), "must be");
361 if (!ArchiveHeapWriter::is_string_too_large_to_archive(obj)) {
362 scratch_rr->obj_at_put(i, obj);
363 }
364 continue;
365 }
366 }
367
368 if (keep_resolved_refs.at(i)) {
369 scratch_rr->obj_at_put(i, obj);
370 }
371 }
372 }
373 return scratch_rr;
374 }
375 return rr;
376 }
377 #endif
378
379 #if INCLUDE_CDS
380 // CDS support. Create a new resolved_references array.
381 void ConstantPool::restore_unshareable_info(TRAPS) {
382 if (!_pool_holder->is_linked() && !_pool_holder->is_rewritten()) {
383 return;
384 }
385 assert(is_constantPool(), "ensure C++ vtable is restored");
386 assert(on_stack(), "should always be set for shared constant pools");
387 assert(is_shared(), "should always be set for shared constant pools");
388 if (is_for_method_handle_intrinsic()) {
389 // See the same check in remove_unshareable_info() below.
390 assert(cache() == nullptr, "must not have cpCache");
391 return;
392 }
393 assert(_cache != nullptr, "constant pool _cache should not be null");
394
395 // Only create the new resolved references array if it hasn't been attempted before
396 if (resolved_references() != nullptr) return;
397
398 if (vmClasses::Object_klass_loaded()) {
399 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
400 #if INCLUDE_CDS_JAVA_HEAP
401 if (ArchiveHeapLoader::is_in_use() &&
402 _cache->archived_references() != nullptr) {
403 oop archived = _cache->archived_references();
404 // Create handle for the archived resolved reference array object
405 HandleMark hm(THREAD);
406 Handle refs_handle(THREAD, archived);
407 set_resolved_references(loader_data->add_handle(refs_handle));
408 _cache->clear_archived_references();
409 } else
410 #endif
411 {
412 // No mapped archived resolved reference array
413 // Recreate the object array and add to ClassLoaderData.
414 int map_length = resolved_reference_length();
415 if (map_length > 0) {
416 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK);
417 HandleMark hm(THREAD);
418 Handle refs_handle(THREAD, stom); // must handleize.
419 set_resolved_references(loader_data->add_handle(refs_handle));
420 }
421 }
422 }
423
424 if (CDSConfig::is_dumping_final_static_archive() && CDSConfig::is_dumping_heap() && resolved_references() != nullptr) {
425 objArrayOop scratch_references = oopFactory::new_objArray(vmClasses::Object_klass(), resolved_references()->length(), CHECK);
426 HeapShared::add_scratch_resolved_references(this, scratch_references);
427 }
428 }
429
430 void ConstantPool::remove_unshareable_info() {
431 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
432 // The _on_stack flag is used to prevent ConstantPools from deallocation during
433 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
434 // we always set _on_stack to true to avoid having to change _flags during runtime.
435 _flags |= (_on_stack | _is_shared);
436
437 if (is_for_method_handle_intrinsic()) {
438 // This CP was created by Method::make_method_handle_intrinsic() and has nothing
439 // that need to be removed/restored. It has no cpCache since the intrinsic methods
440 // don't have any bytecodes.
441 assert(cache() == nullptr, "must not have cpCache");
442 return;
443 }
444
445 bool update_resolved_reference = true;
446 if (CDSConfig::is_dumping_final_static_archive()) {
447 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(this);
448 InstanceKlass* src_holder = src_cp->pool_holder();
449 if (src_holder->defined_by_other_loaders()) {
450 // Unregistered classes are not loaded in the AOT assembly phase. The resolved reference length
451 // is already saved during the training run.
452 precond(!src_holder->is_loaded());
453 precond(resolved_reference_length() >= 0);
454 precond(resolved_references() == nullptr);
455 update_resolved_reference = false;
456 }
457 }
458
459 // resolved_references(): remember its length. If it cannot be restored
460 // from the archived heap objects at run time, we need to dynamically allocate it.
461 if (update_resolved_reference && cache() != nullptr) {
462 set_resolved_reference_length(
463 resolved_references() != nullptr ? resolved_references()->length() : 0);
464 set_resolved_references(OopHandle());
465 }
466 remove_unshareable_entries();
467 }
468
469 static const char* get_type(Klass* k) {
470 const char* type;
471 Klass* src_k;
472 if (ArchiveBuilder::is_active() && ArchiveBuilder::current()->is_in_buffer_space(k)) {
473 src_k = ArchiveBuilder::current()->get_source_addr(k);
474 } else {
475 src_k = k;
476 }
477
478 if (src_k->is_objArray_klass()) {
479 src_k = ObjArrayKlass::cast(src_k)->bottom_klass();
480 assert(!src_k->is_objArray_klass(), "sanity");
481 }
482
483 if (src_k->is_typeArray_klass()) {
484 type = "prim";
485 } else {
486 InstanceKlass* src_ik = InstanceKlass::cast(src_k);
487 if (CDSConfig::is_dumping_final_static_archive() && src_ik->class_loader_data() == nullptr) {
488 return "unreg";
489 }
490 if (src_ik->defined_by_boot_loader()) {
491 return "boot";
492 } else if (src_ik->defined_by_platform_loader()) {
493 return "plat";
494 } else if (src_ik->defined_by_app_loader()) {
495 return "app";
496 } else {
497 return "unreg";
498 }
499 }
500
501 return type;
502 }
503
504 void ConstantPool::remove_unshareable_entries() {
505 ResourceMark rm;
506 log_info(aot, resolve)("Archiving CP entries for %s", pool_holder()->name()->as_C_string());
507 for (int cp_index = 1; cp_index < length(); cp_index++) { // cp_index 0 is unused
508 int cp_tag = tag_at(cp_index).value();
509 switch (cp_tag) {
510 case JVM_CONSTANT_UnresolvedClass:
511 ArchiveBuilder::alloc_stats()->record_klass_cp_entry(false, false);
512 break;
513 case JVM_CONSTANT_UnresolvedClassInError:
514 tag_at_put(cp_index, JVM_CONSTANT_UnresolvedClass);
515 ArchiveBuilder::alloc_stats()->record_klass_cp_entry(false, true);
516 break;
517 case JVM_CONSTANT_MethodHandleInError:
518 tag_at_put(cp_index, JVM_CONSTANT_MethodHandle);
519 break;
520 case JVM_CONSTANT_MethodTypeInError:
521 tag_at_put(cp_index, JVM_CONSTANT_MethodType);
522 break;
523 case JVM_CONSTANT_DynamicInError:
524 tag_at_put(cp_index, JVM_CONSTANT_Dynamic);
525 break;
526 case JVM_CONSTANT_Class:
527 remove_resolved_klass_if_non_deterministic(cp_index);
528 break;
529 default:
530 break;
531 }
532 }
533
534 if (cache() != nullptr) {
535 // cache() is null if this class is not yet linked.
536 cache()->remove_unshareable_info();
537 }
538 }
539
540 void ConstantPool::remove_resolved_klass_if_non_deterministic(int cp_index) {
541 assert(ArchiveBuilder::current()->is_in_buffer_space(this), "must be");
542 assert(tag_at(cp_index).is_klass(), "must be resolved");
543
544 Klass* k = resolved_klass_at(cp_index);
545 bool can_archive;
546
547 if (k == nullptr) {
548 // We'd come here if the referenced class has been excluded via
549 // SystemDictionaryShared::is_excluded_class(). As a result, ArchiveBuilder
550 // has cleared the resolved_klasses()->at(...) pointer to null. Thus, we
551 // need to revert the tag to JVM_CONSTANT_UnresolvedClass.
552 can_archive = false;
553 } else {
554 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(this);
555 can_archive = AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index);
556 }
557
558 if (!can_archive) {
559 int resolved_klass_index = klass_slot_at(cp_index).resolved_klass_index();
560 // This might be at a safepoint but do this in the right order.
561 tag_at_put(cp_index, JVM_CONSTANT_UnresolvedClass);
562 resolved_klasses()->at_put(resolved_klass_index, nullptr);
563 }
564
565 LogStreamHandle(Trace, aot, resolve) log;
566 if (log.is_enabled()) {
567 ResourceMark rm;
568 log.print("%s klass CP entry [%3d]: %s %s",
569 (can_archive ? "archived" : "reverted"),
570 cp_index, pool_holder()->name()->as_C_string(), get_type(pool_holder()));
571 if (can_archive) {
572 log.print(" => %s %s%s", k->name()->as_C_string(), get_type(k),
573 (!k->is_instance_klass() || pool_holder()->is_subtype_of(k)) ? "" : " (not supertype)");
574 } else {
575 Symbol* name = klass_name_at(cp_index);
576 log.print(" => %s", name->as_C_string());
577 }
578 }
579
580 ArchiveBuilder::alloc_stats()->record_klass_cp_entry(can_archive, /*reverted=*/!can_archive);
581 }
582 #endif // INCLUDE_CDS
583
584 int ConstantPool::cp_to_object_index(int cp_index) {
585 // this is harder don't do this so much.
586 int i = reference_map()->find(checked_cast<u2>(cp_index));
587 // We might not find the index for jsr292 call.
588 return (i < 0) ? _no_index_sentinel : i;
589 }
590
591 void ConstantPool::string_at_put(int obj_index, oop str) {
592 oop result = set_resolved_reference_at(obj_index, str);
593 assert(result == nullptr || result == str, "Only set once or to the same string.");
594 }
595
596 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
597 ResourceMark rm;
598 int line_number = -1;
599 const char * source_file = nullptr;
600 if (JavaThread::current()->has_last_Java_frame()) {
601 // try to identify the method which called this function.
602 vframeStream vfst(JavaThread::current());
603 if (!vfst.at_end()) {
604 line_number = vfst.method()->line_number_from_bci(vfst.bci());
605 Symbol* s = vfst.method()->method_holder()->source_file_name();
606 if (s != nullptr) {
607 source_file = s->as_C_string();
608 }
609 }
610 }
611 if (k != this_cp->pool_holder()) {
612 // only print something if the classes are different
613 if (source_file != nullptr) {
614 log_debug(class, resolve)("%s %s %s:%d",
615 this_cp->pool_holder()->external_name(),
616 k->external_name(), source_file, line_number);
617 } else {
618 log_debug(class, resolve)("%s %s",
619 this_cp->pool_holder()->external_name(),
620 k->external_name());
621 }
622 }
623 }
624
625 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int cp_index,
626 TRAPS) {
627 JavaThread* javaThread = THREAD;
628
629 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
630 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
631 // the entry and tag is not updated atomically.
632 CPKlassSlot kslot = this_cp->klass_slot_at(cp_index);
633 int resolved_klass_index = kslot.resolved_klass_index();
634 int name_index = kslot.name_index();
635 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
636
637 // The tag must be JVM_CONSTANT_Class in order to read the correct value from
638 // the unresolved_klasses() array.
639 if (this_cp->tag_at(cp_index).is_klass()) {
640 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
641 assert(klass != nullptr, "must be resolved");
642 return klass;
643 }
644
645 // This tag doesn't change back to unresolved class unless at a safepoint.
646 if (this_cp->tag_at(cp_index).is_unresolved_klass_in_error()) {
647 // The original attempt to resolve this constant pool entry failed so find the
648 // class of the original error and throw another error of the same class
649 // (JVMS 5.4.3).
650 // If there is a detail message, pass that detail message to the error.
651 // The JVMS does not strictly require us to duplicate the same detail message,
652 // or any internal exception fields such as cause or stacktrace. But since the
653 // detail message is often a class name or other literal string, we will repeat it
654 // if we can find it in the symbol table.
655 throw_resolution_error(this_cp, cp_index, CHECK_NULL);
656 ShouldNotReachHere();
657 }
658
659 HandleMark hm(THREAD);
660 Handle mirror_handle;
661 Symbol* name = this_cp->symbol_at(name_index);
662 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
663
664 Klass* k;
665 {
666 // Turn off the single stepping while doing class resolution
667 JvmtiHideSingleStepping jhss(javaThread);
668 k = SystemDictionary::resolve_or_fail(name, loader, true, THREAD);
669 } // JvmtiHideSingleStepping jhss(javaThread);
670
671 if (!HAS_PENDING_EXCEPTION) {
672 // preserve the resolved klass from unloading
673 mirror_handle = Handle(THREAD, k->java_mirror());
674 // Do access check for klasses
675 verify_constant_pool_resolve(this_cp, k, THREAD);
676 }
677
678 // Failed to resolve class. We must record the errors so that subsequent attempts
679 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
680 if (HAS_PENDING_EXCEPTION) {
681 save_and_throw_exception(this_cp, cp_index, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
682 // If CHECK_NULL above doesn't return the exception, that means that
683 // some other thread has beaten us and has resolved the class.
684 // To preserve old behavior, we return the resolved class.
685 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
686 assert(klass != nullptr, "must be resolved if exception was cleared");
687 return klass;
688 }
689
690 // logging for class+resolve.
691 if (log_is_enabled(Debug, class, resolve)){
692 trace_class_resolution(this_cp, k);
693 }
694
695 // The interpreter assumes when the tag is stored, the klass is resolved
696 // and the Klass* stored in _resolved_klasses is non-null, so we need
697 // hardware store ordering here.
698 // We also need to CAS to not overwrite an error from a racing thread.
699 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
700 Atomic::release_store(adr, k);
701
702 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(cp_index),
703 (jbyte)JVM_CONSTANT_UnresolvedClass,
704 (jbyte)JVM_CONSTANT_Class);
705
706 // We need to recheck exceptions from racing thread and return the same.
707 if (old_tag == JVM_CONSTANT_UnresolvedClassInError) {
708 // Remove klass.
709 Atomic::store(adr, (Klass*)nullptr);
710 throw_resolution_error(this_cp, cp_index, CHECK_NULL);
711 }
712
713 return k;
714 }
715
716
717 // Does not update ConstantPool* - to avoid any exception throwing. Used
718 // by compiler and exception handling. Also used to avoid classloads for
719 // instanceof operations. Returns null if the class has not been loaded or
720 // if the verification of constant pool failed
721 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
722 CPKlassSlot kslot = this_cp->klass_slot_at(which);
723 int resolved_klass_index = kslot.resolved_klass_index();
724 int name_index = kslot.name_index();
725 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
726
727 if (this_cp->tag_at(which).is_klass()) {
728 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
729 assert(k != nullptr, "must be resolved");
730 return k;
731 } else if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
732 return nullptr;
733 } else {
734 Thread* current = Thread::current();
735 HandleMark hm(current);
736 Symbol* name = this_cp->symbol_at(name_index);
737 oop loader = this_cp->pool_holder()->class_loader();
738 Handle h_loader (current, loader);
739 Klass* k = SystemDictionary::find_instance_klass(current, name, h_loader);
740
741 // Avoid constant pool verification at a safepoint, as it takes the Module_lock.
742 if (k != nullptr && current->is_Java_thread()) {
743 // Make sure that resolving is legal
744 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
745 ExceptionMark em(THREAD);
746 // return null if verification fails
747 verify_constant_pool_resolve(this_cp, k, THREAD);
748 if (HAS_PENDING_EXCEPTION) {
749 CLEAR_PENDING_EXCEPTION;
750 return nullptr;
751 }
752 return k;
753 } else {
754 return k;
755 }
756 }
757 }
758
759 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
760 int which) {
761 if (cpool->cache() == nullptr) return nullptr; // nothing to load yet
762 if (!(which >= 0 && which < cpool->resolved_method_entries_length())) {
763 // FIXME: should be an assert
764 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
765 return nullptr;
766 }
767 return cpool->cache()->method_if_resolved(which);
768 }
769
770
771 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which, Bytecodes::Code code) {
772 if (cpool->cache() == nullptr) return false; // nothing to load yet
773 if (code == Bytecodes::_invokedynamic) {
774 return cpool->resolved_indy_entry_at(which)->has_appendix();
775 } else {
776 return cpool->resolved_method_entry_at(which)->has_appendix();
777 }
778 }
779
780 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which, Bytecodes::Code code) {
781 if (cpool->cache() == nullptr) return nullptr; // nothing to load yet
782 if (code == Bytecodes::_invokedynamic) {
783 return cpool->resolved_reference_from_indy(which);
784 } else {
785 return cpool->cache()->appendix_if_resolved(which);
786 }
787 }
788
789
790 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which, Bytecodes::Code code) {
791 if (cpool->cache() == nullptr) return false; // nothing to load yet
792 if (code == Bytecodes::_invokedynamic) {
793 return cpool->resolved_indy_entry_at(which)->has_local_signature();
794 } else {
795 return cpool->resolved_method_entry_at(which)->has_local_signature();
796 }
797 }
798
799 // Translate index, which could be CPCache index or Indy index, to a constant pool index
800 int ConstantPool::to_cp_index(int index, Bytecodes::Code code) {
801 assert(cache() != nullptr, "'index' is a rewritten index so this class must have been rewritten");
802 switch(code) {
803 case Bytecodes::_invokedynamic:
804 return invokedynamic_bootstrap_ref_index_at(index);
805 case Bytecodes::_getfield:
806 case Bytecodes::_getstatic:
807 case Bytecodes::_putfield:
808 case Bytecodes::_putstatic:
809 return resolved_field_entry_at(index)->constant_pool_index();
810 case Bytecodes::_invokeinterface:
811 case Bytecodes::_invokehandle:
812 case Bytecodes::_invokespecial:
813 case Bytecodes::_invokestatic:
814 case Bytecodes::_invokevirtual:
815 case Bytecodes::_fast_invokevfinal: // Bytecode interpreter uses this
816 return resolved_method_entry_at(index)->constant_pool_index();
817 default:
818 fatal("Unexpected bytecode: %s", Bytecodes::name(code));
819 }
820 }
821
822 bool ConstantPool::is_resolved(int index, Bytecodes::Code code) {
823 assert(cache() != nullptr, "'index' is a rewritten index so this class must have been rewritten");
824 switch(code) {
825 case Bytecodes::_invokedynamic:
826 return resolved_indy_entry_at(index)->is_resolved();
827
828 case Bytecodes::_getfield:
829 case Bytecodes::_getstatic:
830 case Bytecodes::_putfield:
831 case Bytecodes::_putstatic:
832 return resolved_field_entry_at(index)->is_resolved(code);
833
834 case Bytecodes::_invokeinterface:
835 case Bytecodes::_invokehandle:
836 case Bytecodes::_invokespecial:
837 case Bytecodes::_invokestatic:
838 case Bytecodes::_invokevirtual:
839 case Bytecodes::_fast_invokevfinal: // Bytecode interpreter uses this
840 return resolved_method_entry_at(index)->is_resolved(code);
841
842 default:
843 fatal("Unexpected bytecode: %s", Bytecodes::name(code));
844 }
845 }
846
847 u2 ConstantPool::uncached_name_and_type_ref_index_at(int cp_index) {
848 if (tag_at(cp_index).has_bootstrap()) {
849 u2 pool_index = bootstrap_name_and_type_ref_index_at(cp_index);
850 assert(tag_at(pool_index).is_name_and_type(), "");
851 return pool_index;
852 }
853 assert(tag_at(cp_index).is_field_or_method(), "Corrupted constant pool");
854 assert(!tag_at(cp_index).has_bootstrap(), "Must be handled above");
855 jint ref_index = *int_at_addr(cp_index);
856 return extract_high_short_from_int(ref_index);
857 }
858
859 u2 ConstantPool::name_and_type_ref_index_at(int index, Bytecodes::Code code) {
860 return uncached_name_and_type_ref_index_at(to_cp_index(index, code));
861 }
862
863 constantTag ConstantPool::tag_ref_at(int which, Bytecodes::Code code) {
864 // which may be either a Constant Pool index or a rewritten index
865 int pool_index = which;
866 assert(cache() != nullptr, "'index' is a rewritten index so this class must have been rewritten");
867 pool_index = to_cp_index(which, code);
868 return tag_at(pool_index);
869 }
870
871 u2 ConstantPool::uncached_klass_ref_index_at(int cp_index) {
872 assert(tag_at(cp_index).is_field_or_method(), "Corrupted constant pool");
873 jint ref_index = *int_at_addr(cp_index);
874 return extract_low_short_from_int(ref_index);
875 }
876
877 u2 ConstantPool::klass_ref_index_at(int index, Bytecodes::Code code) {
878 assert(code != Bytecodes::_invokedynamic,
879 "an invokedynamic instruction does not have a klass");
880 return uncached_klass_ref_index_at(to_cp_index(index, code));
881 }
882
883 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
884 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
885 return; // short cut, typeArray klass is always accessible
886 }
887 Klass* holder = this_cp->pool_holder();
888 LinkResolver::check_klass_accessibility(holder, k, CHECK);
889 }
890
891
892 u2 ConstantPool::name_ref_index_at(int cp_index) {
893 jint ref_index = name_and_type_at(cp_index);
894 return extract_low_short_from_int(ref_index);
895 }
896
897
898 u2 ConstantPool::signature_ref_index_at(int cp_index) {
899 jint ref_index = name_and_type_at(cp_index);
900 return extract_high_short_from_int(ref_index);
901 }
902
903
904 Klass* ConstantPool::klass_ref_at(int which, Bytecodes::Code code, TRAPS) {
905 return klass_at(klass_ref_index_at(which, code), THREAD);
906 }
907
908 Symbol* ConstantPool::klass_name_at(int cp_index) const {
909 return symbol_at(klass_slot_at(cp_index).name_index());
910 }
911
912 Symbol* ConstantPool::klass_ref_at_noresolve(int which, Bytecodes::Code code) {
913 jint ref_index = klass_ref_index_at(which, code);
914 return klass_at_noresolve(ref_index);
915 }
916
917 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int cp_index) {
918 jint ref_index = uncached_klass_ref_index_at(cp_index);
919 return klass_at_noresolve(ref_index);
920 }
921
922 char* ConstantPool::string_at_noresolve(int cp_index) {
923 return unresolved_string_at(cp_index)->as_C_string();
924 }
925
926 BasicType ConstantPool::basic_type_for_signature_at(int cp_index) const {
927 return Signature::basic_type(symbol_at(cp_index));
928 }
929
930
931 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
932 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
933 if (this_cp->tag_at(index).is_string()) {
934 this_cp->string_at(index, CHECK);
935 }
936 }
937 }
938
939 static const char* exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
940 // Note: caller needs ResourceMark
941
942 // Dig out the detailed message to reuse if possible
943 const char* msg = java_lang_Throwable::message_as_utf8(pending_exception);
944 if (msg != nullptr) {
945 return msg;
946 }
947
948 Symbol* message = nullptr;
949 // Return specific message for the tag
950 switch (tag.value()) {
951 case JVM_CONSTANT_UnresolvedClass:
952 // return the class name in the error message
953 message = this_cp->klass_name_at(which);
954 break;
955 case JVM_CONSTANT_MethodHandle:
956 // return the method handle name in the error message
957 message = this_cp->method_handle_name_ref_at(which);
958 break;
959 case JVM_CONSTANT_MethodType:
960 // return the method type signature in the error message
961 message = this_cp->method_type_signature_at(which);
962 break;
963 case JVM_CONSTANT_Dynamic:
964 // return the name of the condy in the error message
965 message = this_cp->uncached_name_ref_at(which);
966 break;
967 default:
968 ShouldNotReachHere();
969 }
970
971 return message != nullptr ? message->as_C_string() : nullptr;
972 }
973
974 static void add_resolution_error(JavaThread* current, const constantPoolHandle& this_cp, int which,
975 constantTag tag, oop pending_exception) {
976
977 ResourceMark rm(current);
978 Symbol* error = pending_exception->klass()->name();
979 oop cause = java_lang_Throwable::cause(pending_exception);
980
981 // Also dig out the exception cause, if present.
982 Symbol* cause_sym = nullptr;
983 const char* cause_msg = nullptr;
984 if (cause != nullptr && cause != pending_exception) {
985 cause_sym = cause->klass()->name();
986 cause_msg = java_lang_Throwable::message_as_utf8(cause);
987 }
988
989 const char* message = exception_message(this_cp, which, tag, pending_exception);
990 SystemDictionary::add_resolution_error(this_cp, which, error, message, cause_sym, cause_msg);
991 }
992
993
994 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
995 ResourceMark rm(THREAD);
996 const char* message = nullptr;
997 Symbol* cause = nullptr;
998 const char* cause_msg = nullptr;
999 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message, &cause, &cause_msg);
1000 assert(error != nullptr, "checking");
1001
1002 CLEAR_PENDING_EXCEPTION;
1003 if (message != nullptr) {
1004 if (cause != nullptr) {
1005 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_msg);
1006 THROW_MSG_CAUSE(error, message, h_cause);
1007 } else {
1008 THROW_MSG(error, message);
1009 }
1010 } else {
1011 if (cause != nullptr) {
1012 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_msg);
1013 THROW_CAUSE(error, h_cause);
1014 } else {
1015 THROW(error);
1016 }
1017 }
1018 }
1019
1020 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
1021 // exception in the resolution error table, so that the same exception is thrown again.
1022 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int cp_index,
1023 constantTag tag, TRAPS) {
1024
1025 int error_tag = tag.error_value();
1026
1027 if (!PENDING_EXCEPTION->
1028 is_a(vmClasses::LinkageError_klass())) {
1029 // Just throw the exception and don't prevent these classes from
1030 // being loaded due to virtual machine errors like StackOverflow
1031 // and OutOfMemoryError, etc, or if the thread was hit by stop()
1032 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
1033 } else if (this_cp->tag_at(cp_index).value() != error_tag) {
1034 add_resolution_error(THREAD, this_cp, cp_index, tag, PENDING_EXCEPTION);
1035 // CAS in the tag. If a thread beat us to registering this error that's fine.
1036 // If another thread resolved the reference, this is a race condition. This
1037 // thread may have had a security manager or something temporary.
1038 // This doesn't deterministically get an error. So why do we save this?
1039 // We save this because jvmti can add classes to the bootclass path after
1040 // this error, so it needs to get the same error if the error is first.
1041 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(cp_index),
1042 (jbyte)tag.value(),
1043 (jbyte)error_tag);
1044 if (old_tag != error_tag && old_tag != tag.value()) {
1045 // MethodHandles and MethodType doesn't change to resolved version.
1046 assert(this_cp->tag_at(cp_index).is_klass(), "Wrong tag value");
1047 // Forget the exception and use the resolved class.
1048 CLEAR_PENDING_EXCEPTION;
1049 }
1050 } else {
1051 // some other thread put this in error state
1052 throw_resolution_error(this_cp, cp_index, CHECK);
1053 }
1054 }
1055
1056 constantTag ConstantPool::constant_tag_at(int cp_index) {
1057 constantTag tag = tag_at(cp_index);
1058 if (tag.is_dynamic_constant()) {
1059 BasicType bt = basic_type_for_constant_at(cp_index);
1060 return constantTag(constantTag::type2tag(bt));
1061 }
1062 return tag;
1063 }
1064
1065 BasicType ConstantPool::basic_type_for_constant_at(int cp_index) {
1066 constantTag tag = tag_at(cp_index);
1067 if (tag.is_dynamic_constant() ||
1068 tag.is_dynamic_constant_in_error()) {
1069 // have to look at the signature for this one
1070 Symbol* constant_type = uncached_signature_ref_at(cp_index);
1071 return Signature::basic_type(constant_type);
1072 }
1073 return tag.basic_type();
1074 }
1075
1076 // Called to resolve constants in the constant pool and return an oop.
1077 // Some constant pool entries cache their resolved oop. This is also
1078 // called to create oops from constants to use in arguments for invokedynamic
1079 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
1080 int cp_index, int cache_index,
1081 bool* status_return, TRAPS) {
1082 oop result_oop = nullptr;
1083
1084 if (cache_index == _possible_index_sentinel) {
1085 // It is possible that this constant is one which is cached in the objects.
1086 // We'll do a linear search. This should be OK because this usage is rare.
1087 // FIXME: If bootstrap specifiers stress this code, consider putting in
1088 // a reverse index. Binary search over a short array should do it.
1089 assert(cp_index > 0, "valid constant pool index");
1090 cache_index = this_cp->cp_to_object_index(cp_index);
1091 }
1092 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
1093 assert(cp_index == _no_index_sentinel || cp_index >= 0, "");
1094
1095 if (cache_index >= 0) {
1096 result_oop = this_cp->resolved_reference_at(cache_index);
1097 if (result_oop != nullptr) {
1098 if (result_oop == Universe::the_null_sentinel()) {
1099 DEBUG_ONLY(int temp_index = (cp_index >= 0 ? cp_index : this_cp->object_to_cp_index(cache_index)));
1100 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
1101 result_oop = nullptr;
1102 }
1103 if (status_return != nullptr) (*status_return) = true;
1104 return result_oop;
1105 // That was easy...
1106 }
1107 cp_index = this_cp->object_to_cp_index(cache_index);
1108 }
1109
1110 jvalue prim_value; // temp used only in a few cases below
1111
1112 constantTag tag = this_cp->tag_at(cp_index);
1113
1114 if (status_return != nullptr) {
1115 // don't trigger resolution if the constant might need it
1116 switch (tag.value()) {
1117 case JVM_CONSTANT_Class:
1118 assert(this_cp->resolved_klass_at(cp_index) != nullptr, "must be resolved");
1119 break;
1120 case JVM_CONSTANT_String:
1121 case JVM_CONSTANT_Integer:
1122 case JVM_CONSTANT_Float:
1123 case JVM_CONSTANT_Long:
1124 case JVM_CONSTANT_Double:
1125 // these guys trigger OOM at worst
1126 break;
1127 default:
1128 (*status_return) = false;
1129 return nullptr;
1130 }
1131 // from now on there is either success or an OOME
1132 (*status_return) = true;
1133 }
1134
1135 switch (tag.value()) {
1136
1137 case JVM_CONSTANT_UnresolvedClass:
1138 case JVM_CONSTANT_Class:
1139 {
1140 assert(cache_index == _no_index_sentinel, "should not have been set");
1141 Klass* resolved = klass_at_impl(this_cp, cp_index, CHECK_NULL);
1142 // ldc wants the java mirror.
1143 result_oop = resolved->java_mirror();
1144 break;
1145 }
1146
1147 case JVM_CONSTANT_Dynamic:
1148 { PerfTraceTimedEvent timer(ClassLoader::perf_resolve_invokedynamic_time(),
1149 ClassLoader::perf_resolve_invokedynamic_count());
1150
1151 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
1152 BootstrapInfo bootstrap_specifier(this_cp, cp_index);
1153
1154 // The initial step in resolving an unresolved symbolic reference to a
1155 // dynamically-computed constant is to resolve the symbolic reference to a
1156 // method handle which will be the bootstrap method for the dynamically-computed
1157 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
1158 // method fails, then a MethodHandleInError is stored at the corresponding
1159 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
1160 // set a DynamicConstantInError here since any subsequent use of this
1161 // bootstrap method will encounter the resolution of MethodHandleInError.
1162 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
1163 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
1164 // for the bootstrap_specifier created above.
1165 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1166 Exceptions::wrap_dynamic_exception(/* is_indy */ false, THREAD);
1167 if (HAS_PENDING_EXCEPTION) {
1168 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
1169 // will check for a LinkageError and store a DynamicConstantInError.
1170 save_and_throw_exception(this_cp, cp_index, tag, CHECK_NULL);
1171 }
1172 result_oop = bootstrap_specifier.resolved_value()();
1173 BasicType type = Signature::basic_type(bootstrap_specifier.signature());
1174 if (!is_reference_type(type)) {
1175 // Make sure the primitive value is properly boxed.
1176 // This is a JDK responsibility.
1177 const char* fail = nullptr;
1178 if (result_oop == nullptr) {
1179 fail = "null result instead of box";
1180 } else if (!is_java_primitive(type)) {
1181 // FIXME: support value types via unboxing
1182 fail = "can only handle references and primitives";
1183 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
1184 fail = "primitive is not properly boxed";
1185 }
1186 if (fail != nullptr) {
1187 // Since this exception is not a LinkageError, throw exception
1188 // but do not save a DynamicInError resolution result.
1189 // See section 5.4.3 of the VM spec.
1190 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
1191 }
1192 }
1193
1194 LogTarget(Debug, methodhandles, condy) lt_condy;
1195 if (lt_condy.is_enabled()) {
1196 LogStream ls(lt_condy);
1197 bootstrap_specifier.print_msg_on(&ls, "resolve_constant_at_impl");
1198 }
1199 break;
1200 }
1201
1202 case JVM_CONSTANT_String:
1203 assert(cache_index != _no_index_sentinel, "should have been set");
1204 result_oop = string_at_impl(this_cp, cp_index, cache_index, CHECK_NULL);
1205 break;
1206
1207 case JVM_CONSTANT_MethodHandle:
1208 { PerfTraceTimedEvent timer(ClassLoader::perf_resolve_method_handle_time(),
1209 ClassLoader::perf_resolve_method_handle_count());
1210
1211 int ref_kind = this_cp->method_handle_ref_kind_at(cp_index);
1212 int callee_index = this_cp->method_handle_klass_index_at(cp_index);
1213 Symbol* name = this_cp->method_handle_name_ref_at(cp_index);
1214 Symbol* signature = this_cp->method_handle_signature_ref_at(cp_index);
1215 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(cp_index));
1216 { ResourceMark rm(THREAD);
1217 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1218 ref_kind, cp_index, this_cp->method_handle_index_at(cp_index),
1219 callee_index, name->as_C_string(), signature->as_C_string());
1220 }
1221
1222 Klass* callee = klass_at_impl(this_cp, callee_index, THREAD);
1223 if (HAS_PENDING_EXCEPTION) {
1224 save_and_throw_exception(this_cp, cp_index, tag, CHECK_NULL);
1225 }
1226
1227 // Check constant pool method consistency
1228 if ((callee->is_interface() && m_tag.is_method()) ||
1229 (!callee->is_interface() && m_tag.is_interface_method())) {
1230 ResourceMark rm(THREAD);
1231 stringStream ss;
1232 ss.print("Inconsistent constant pool data in classfile for class %s. "
1233 "Method '", callee->name()->as_C_string());
1234 signature->print_as_signature_external_return_type(&ss);
1235 ss.print(" %s(", name->as_C_string());
1236 signature->print_as_signature_external_parameters(&ss);
1237 ss.print(")' at index %d is %s and should be %s",
1238 cp_index,
1239 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1240 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1241 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1242 Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), "%s", ss.as_string());
1243 save_and_throw_exception(this_cp, cp_index, tag, CHECK_NULL);
1244 }
1245
1246 Klass* klass = this_cp->pool_holder();
1247 HandleMark hm(THREAD);
1248 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1249 callee, name, signature,
1250 THREAD);
1251 if (HAS_PENDING_EXCEPTION) {
1252 save_and_throw_exception(this_cp, cp_index, tag, CHECK_NULL);
1253 }
1254 result_oop = value();
1255 break;
1256 }
1257
1258 case JVM_CONSTANT_MethodType:
1259 { PerfTraceTimedEvent timer(ClassLoader::perf_resolve_method_type_time(),
1260 ClassLoader::perf_resolve_method_type_count());
1261
1262 Symbol* signature = this_cp->method_type_signature_at(cp_index);
1263 { ResourceMark rm(THREAD);
1264 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1265 cp_index, this_cp->method_type_index_at(cp_index),
1266 signature->as_C_string());
1267 }
1268 Klass* klass = this_cp->pool_holder();
1269 HandleMark hm(THREAD);
1270 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1271 result_oop = value();
1272 if (HAS_PENDING_EXCEPTION) {
1273 save_and_throw_exception(this_cp, cp_index, tag, CHECK_NULL);
1274 }
1275 break;
1276 }
1277
1278 case JVM_CONSTANT_Integer:
1279 assert(cache_index == _no_index_sentinel, "should not have been set");
1280 prim_value.i = this_cp->int_at(cp_index);
1281 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1282 break;
1283
1284 case JVM_CONSTANT_Float:
1285 assert(cache_index == _no_index_sentinel, "should not have been set");
1286 prim_value.f = this_cp->float_at(cp_index);
1287 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1288 break;
1289
1290 case JVM_CONSTANT_Long:
1291 assert(cache_index == _no_index_sentinel, "should not have been set");
1292 prim_value.j = this_cp->long_at(cp_index);
1293 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1294 break;
1295
1296 case JVM_CONSTANT_Double:
1297 assert(cache_index == _no_index_sentinel, "should not have been set");
1298 prim_value.d = this_cp->double_at(cp_index);
1299 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1300 break;
1301
1302 case JVM_CONSTANT_UnresolvedClassInError:
1303 case JVM_CONSTANT_DynamicInError:
1304 case JVM_CONSTANT_MethodHandleInError:
1305 case JVM_CONSTANT_MethodTypeInError:
1306 throw_resolution_error(this_cp, cp_index, CHECK_NULL);
1307 break;
1308
1309 default:
1310 fatal("unexpected constant tag at CP %p[%d/%d] = %d", this_cp(), cp_index, cache_index, tag.value());
1311 break;
1312 }
1313
1314 if (cache_index >= 0) {
1315 // Benign race condition: resolved_references may already be filled in.
1316 // The important thing here is that all threads pick up the same result.
1317 // It doesn't matter which racing thread wins, as long as only one
1318 // result is used by all threads, and all future queries.
1319 oop new_result = (result_oop == nullptr ? Universe::the_null_sentinel() : result_oop);
1320 oop old_result = this_cp->set_resolved_reference_at(cache_index, new_result);
1321 if (old_result == nullptr) {
1322 return result_oop; // was installed
1323 } else {
1324 // Return the winning thread's result. This can be different than
1325 // the result here for MethodHandles.
1326 if (old_result == Universe::the_null_sentinel())
1327 old_result = nullptr;
1328 return old_result;
1329 }
1330 } else {
1331 assert(result_oop != Universe::the_null_sentinel(), "");
1332 return result_oop;
1333 }
1334 }
1335
1336 oop ConstantPool::uncached_string_at(int cp_index, TRAPS) {
1337 Symbol* sym = unresolved_string_at(cp_index);
1338 oop str = StringTable::intern(sym, CHECK_(nullptr));
1339 assert(java_lang_String::is_instance(str), "must be string");
1340 return str;
1341 }
1342
1343 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int cp_index,
1344 int start_arg, int end_arg,
1345 objArrayHandle info, int pos,
1346 bool must_resolve, Handle if_not_available,
1347 TRAPS) {
1348 int limit = pos + end_arg - start_arg;
1349 // checks: cp_index in range [0..this_cp->length),
1350 // tag at cp_index, start..end in range [0..this_cp->bootstrap_argument_count],
1351 // info array non-null, pos..limit in [0..info.length]
1352 if ((0 >= cp_index || cp_index >= this_cp->length()) ||
1353 !(this_cp->tag_at(cp_index).is_invoke_dynamic() ||
1354 this_cp->tag_at(cp_index).is_dynamic_constant()) ||
1355 (0 > start_arg || start_arg > end_arg) ||
1356 (end_arg > this_cp->bootstrap_argument_count_at(cp_index)) ||
1357 (0 > pos || pos > limit) ||
1358 (info.is_null() || limit > info->length())) {
1359 // An index or something else went wrong; throw an error.
1360 // Since this is an internal API, we don't expect this,
1361 // so we don't bother to craft a nice message.
1362 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1363 }
1364 // now we can loop safely
1365 int info_i = pos;
1366 for (int i = start_arg; i < end_arg; i++) {
1367 int arg_index = this_cp->bootstrap_argument_index_at(cp_index, i);
1368 oop arg_oop;
1369 if (must_resolve) {
1370 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1371 } else {
1372 bool found_it = false;
1373 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1374 if (!found_it) arg_oop = if_not_available();
1375 }
1376 info->obj_at_put(info_i++, arg_oop);
1377 }
1378 }
1379
1380 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int cp_index, int obj_index, TRAPS) {
1381 // If the string has already been interned, this entry will be non-null
1382 oop str = this_cp->resolved_reference_at(obj_index);
1383 assert(str != Universe::the_null_sentinel(), "");
1384 if (str != nullptr) return str;
1385 Symbol* sym = this_cp->unresolved_string_at(cp_index);
1386 str = StringTable::intern(sym, CHECK_(nullptr));
1387 this_cp->string_at_put(obj_index, str);
1388 assert(java_lang_String::is_instance(str), "must be string");
1389 return str;
1390 }
1391
1392
1393 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int cp_index) {
1394 // Names are interned, so we can compare Symbol*s directly
1395 Symbol* cp_name = klass_name_at(cp_index);
1396 return (cp_name == k->name());
1397 }
1398
1399
1400 // Iterate over symbols and decrement ones which are Symbol*s
1401 // This is done during GC.
1402 // Only decrement the UTF8 symbols. Strings point to
1403 // these symbols but didn't increment the reference count.
1404 void ConstantPool::unreference_symbols() {
1405 for (int index = 1; index < length(); index++) { // Index 0 is unused
1406 constantTag tag = tag_at(index);
1407 if (tag.is_symbol()) {
1408 symbol_at(index)->decrement_refcount();
1409 }
1410 }
1411 }
1412
1413
1414 // Compare this constant pool's entry at index1 to the constant pool
1415 // cp2's entry at index2.
1416 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1417 int index2) {
1418
1419 // The error tags are equivalent to non-error tags when comparing
1420 jbyte t1 = tag_at(index1).non_error_value();
1421 jbyte t2 = cp2->tag_at(index2).non_error_value();
1422
1423 // Some classes are pre-resolved (like Throwable) which may lead to
1424 // consider it as a different entry. We then revert them back temporarily
1425 // to ensure proper comparison.
1426 if (t1 == JVM_CONSTANT_Class) {
1427 t1 = JVM_CONSTANT_UnresolvedClass;
1428 }
1429 if (t2 == JVM_CONSTANT_Class) {
1430 t2 = JVM_CONSTANT_UnresolvedClass;
1431 }
1432
1433 if (t1 != t2) {
1434 // Not the same entry type so there is nothing else to check. Note
1435 // that this style of checking will consider resolved/unresolved
1436 // class pairs as different.
1437 // From the ConstantPool* API point of view, this is correct
1438 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1439 // plays out in the context of ConstantPool* merging.
1440 return false;
1441 }
1442
1443 switch (t1) {
1444 case JVM_CONSTANT_ClassIndex:
1445 {
1446 int recur1 = klass_index_at(index1);
1447 int recur2 = cp2->klass_index_at(index2);
1448 if (compare_entry_to(recur1, cp2, recur2)) {
1449 return true;
1450 }
1451 } break;
1452
1453 case JVM_CONSTANT_Double:
1454 {
1455 jdouble d1 = double_at(index1);
1456 jdouble d2 = cp2->double_at(index2);
1457 if (d1 == d2) {
1458 return true;
1459 }
1460 } break;
1461
1462 case JVM_CONSTANT_Fieldref:
1463 case JVM_CONSTANT_InterfaceMethodref:
1464 case JVM_CONSTANT_Methodref:
1465 {
1466 int recur1 = uncached_klass_ref_index_at(index1);
1467 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1468 bool match = compare_entry_to(recur1, cp2, recur2);
1469 if (match) {
1470 recur1 = uncached_name_and_type_ref_index_at(index1);
1471 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1472 if (compare_entry_to(recur1, cp2, recur2)) {
1473 return true;
1474 }
1475 }
1476 } break;
1477
1478 case JVM_CONSTANT_Float:
1479 {
1480 jfloat f1 = float_at(index1);
1481 jfloat f2 = cp2->float_at(index2);
1482 if (f1 == f2) {
1483 return true;
1484 }
1485 } break;
1486
1487 case JVM_CONSTANT_Integer:
1488 {
1489 jint i1 = int_at(index1);
1490 jint i2 = cp2->int_at(index2);
1491 if (i1 == i2) {
1492 return true;
1493 }
1494 } break;
1495
1496 case JVM_CONSTANT_Long:
1497 {
1498 jlong l1 = long_at(index1);
1499 jlong l2 = cp2->long_at(index2);
1500 if (l1 == l2) {
1501 return true;
1502 }
1503 } break;
1504
1505 case JVM_CONSTANT_NameAndType:
1506 {
1507 int recur1 = name_ref_index_at(index1);
1508 int recur2 = cp2->name_ref_index_at(index2);
1509 if (compare_entry_to(recur1, cp2, recur2)) {
1510 recur1 = signature_ref_index_at(index1);
1511 recur2 = cp2->signature_ref_index_at(index2);
1512 if (compare_entry_to(recur1, cp2, recur2)) {
1513 return true;
1514 }
1515 }
1516 } break;
1517
1518 case JVM_CONSTANT_StringIndex:
1519 {
1520 int recur1 = string_index_at(index1);
1521 int recur2 = cp2->string_index_at(index2);
1522 if (compare_entry_to(recur1, cp2, recur2)) {
1523 return true;
1524 }
1525 } break;
1526
1527 case JVM_CONSTANT_UnresolvedClass:
1528 {
1529 Symbol* k1 = klass_name_at(index1);
1530 Symbol* k2 = cp2->klass_name_at(index2);
1531 if (k1 == k2) {
1532 return true;
1533 }
1534 } break;
1535
1536 case JVM_CONSTANT_MethodType:
1537 {
1538 int k1 = method_type_index_at(index1);
1539 int k2 = cp2->method_type_index_at(index2);
1540 if (compare_entry_to(k1, cp2, k2)) {
1541 return true;
1542 }
1543 } break;
1544
1545 case JVM_CONSTANT_MethodHandle:
1546 {
1547 int k1 = method_handle_ref_kind_at(index1);
1548 int k2 = cp2->method_handle_ref_kind_at(index2);
1549 if (k1 == k2) {
1550 int i1 = method_handle_index_at(index1);
1551 int i2 = cp2->method_handle_index_at(index2);
1552 if (compare_entry_to(i1, cp2, i2)) {
1553 return true;
1554 }
1555 }
1556 } break;
1557
1558 case JVM_CONSTANT_Dynamic:
1559 {
1560 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1561 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1562 int i1 = bootstrap_methods_attribute_index(index1);
1563 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1564 bool match_entry = compare_entry_to(k1, cp2, k2);
1565 bool match_operand = compare_operand_to(i1, cp2, i2);
1566 return (match_entry && match_operand);
1567 } break;
1568
1569 case JVM_CONSTANT_InvokeDynamic:
1570 {
1571 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1572 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1573 int i1 = bootstrap_methods_attribute_index(index1);
1574 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1575 bool match_entry = compare_entry_to(k1, cp2, k2);
1576 bool match_operand = compare_operand_to(i1, cp2, i2);
1577 return (match_entry && match_operand);
1578 } break;
1579
1580 case JVM_CONSTANT_String:
1581 {
1582 Symbol* s1 = unresolved_string_at(index1);
1583 Symbol* s2 = cp2->unresolved_string_at(index2);
1584 if (s1 == s2) {
1585 return true;
1586 }
1587 } break;
1588
1589 case JVM_CONSTANT_Utf8:
1590 {
1591 Symbol* s1 = symbol_at(index1);
1592 Symbol* s2 = cp2->symbol_at(index2);
1593 if (s1 == s2) {
1594 return true;
1595 }
1596 } break;
1597
1598 // Invalid is used as the tag for the second constant pool entry
1599 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1600 // not be seen by itself.
1601 case JVM_CONSTANT_Invalid: // fall through
1602
1603 default:
1604 ShouldNotReachHere();
1605 break;
1606 }
1607
1608 return false;
1609 } // end compare_entry_to()
1610
1611
1612 // Resize the operands array with delta_len and delta_size.
1613 // Used in RedefineClasses for CP merge.
1614 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1615 int old_len = operand_array_length(operands());
1616 int new_len = old_len + delta_len;
1617 int min_len = (delta_len > 0) ? old_len : new_len;
1618
1619 int old_size = operands()->length();
1620 int new_size = old_size + delta_size;
1621 int min_size = (delta_size > 0) ? old_size : new_size;
1622
1623 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1624 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1625
1626 // Set index in the resized array for existing elements only
1627 for (int idx = 0; idx < min_len; idx++) {
1628 int offset = operand_offset_at(idx); // offset in original array
1629 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1630 }
1631 // Copy the bootstrap specifiers only
1632 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1633 new_ops->adr_at(2*new_len),
1634 (min_size - 2*min_len) * sizeof(u2));
1635 // Explicitly deallocate old operands array.
1636 // Note, it is not needed for 7u backport.
1637 if ( operands() != nullptr) { // the safety check
1638 MetadataFactory::free_array<u2>(loader_data, operands());
1639 }
1640 set_operands(new_ops);
1641 } // end resize_operands()
1642
1643
1644 // Extend the operands array with the length and size of the ext_cp operands.
1645 // Used in RedefineClasses for CP merge.
1646 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1647 int delta_len = operand_array_length(ext_cp->operands());
1648 if (delta_len == 0) {
1649 return; // nothing to do
1650 }
1651 int delta_size = ext_cp->operands()->length();
1652
1653 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1654
1655 if (operand_array_length(operands()) == 0) {
1656 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1657 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1658 // The first element index defines the offset of second part
1659 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1660 set_operands(new_ops);
1661 } else {
1662 resize_operands(delta_len, delta_size, CHECK);
1663 }
1664
1665 } // end extend_operands()
1666
1667
1668 // Shrink the operands array to a smaller array with new_len length.
1669 // Used in RedefineClasses for CP merge.
1670 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1671 int old_len = operand_array_length(operands());
1672 if (new_len == old_len) {
1673 return; // nothing to do
1674 }
1675 assert(new_len < old_len, "shrunken operands array must be smaller");
1676
1677 int free_base = operand_next_offset_at(new_len - 1);
1678 int delta_len = new_len - old_len;
1679 int delta_size = 2*delta_len + free_base - operands()->length();
1680
1681 resize_operands(delta_len, delta_size, CHECK);
1682
1683 } // end shrink_operands()
1684
1685
1686 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1687 const constantPoolHandle& to_cp,
1688 TRAPS) {
1689
1690 int from_oplen = operand_array_length(from_cp->operands());
1691 int old_oplen = operand_array_length(to_cp->operands());
1692 if (from_oplen != 0) {
1693 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1694 // append my operands to the target's operands array
1695 if (old_oplen == 0) {
1696 // Can't just reuse from_cp's operand list because of deallocation issues
1697 int len = from_cp->operands()->length();
1698 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1699 Copy::conjoint_memory_atomic(
1700 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1701 to_cp->set_operands(new_ops);
1702 } else {
1703 int old_len = to_cp->operands()->length();
1704 int from_len = from_cp->operands()->length();
1705 int old_off = old_oplen * sizeof(u2);
1706 int from_off = from_oplen * sizeof(u2);
1707 // Use the metaspace for the destination constant pool
1708 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1709 int fillp = 0, len = 0;
1710 // first part of dest
1711 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1712 new_operands->adr_at(fillp),
1713 (len = old_off) * sizeof(u2));
1714 fillp += len;
1715 // first part of src
1716 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1717 new_operands->adr_at(fillp),
1718 (len = from_off) * sizeof(u2));
1719 fillp += len;
1720 // second part of dest
1721 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1722 new_operands->adr_at(fillp),
1723 (len = old_len - old_off) * sizeof(u2));
1724 fillp += len;
1725 // second part of src
1726 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1727 new_operands->adr_at(fillp),
1728 (len = from_len - from_off) * sizeof(u2));
1729 fillp += len;
1730 assert(fillp == new_operands->length(), "");
1731
1732 // Adjust indexes in the first part of the copied operands array.
1733 for (int j = 0; j < from_oplen; j++) {
1734 int offset = operand_offset_at(new_operands, old_oplen + j);
1735 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1736 offset += old_len; // every new tuple is preceded by old_len extra u2's
1737 operand_offset_at_put(new_operands, old_oplen + j, offset);
1738 }
1739
1740 // replace target operands array with combined array
1741 to_cp->set_operands(new_operands);
1742 }
1743 }
1744 } // end copy_operands()
1745
1746
1747 // Copy this constant pool's entries at start_i to end_i (inclusive)
1748 // to the constant pool to_cp's entries starting at to_i. A total of
1749 // (end_i - start_i) + 1 entries are copied.
1750 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1751 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1752
1753
1754 int dest_cpi = to_i; // leave original alone for debug purposes
1755
1756 for (int src_cpi = start_i; src_cpi <= end_i; /* see loop bottom */ ) {
1757 copy_entry_to(from_cp, src_cpi, to_cp, dest_cpi);
1758
1759 switch (from_cp->tag_at(src_cpi).value()) {
1760 case JVM_CONSTANT_Double:
1761 case JVM_CONSTANT_Long:
1762 // double and long take two constant pool entries
1763 src_cpi += 2;
1764 dest_cpi += 2;
1765 break;
1766
1767 default:
1768 // all others take one constant pool entry
1769 src_cpi++;
1770 dest_cpi++;
1771 break;
1772 }
1773 }
1774 copy_operands(from_cp, to_cp, CHECK);
1775
1776 } // end copy_cp_to_impl()
1777
1778
1779 // Copy this constant pool's entry at from_i to the constant pool
1780 // to_cp's entry at to_i.
1781 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1782 const constantPoolHandle& to_cp, int to_i) {
1783
1784 int tag = from_cp->tag_at(from_i).value();
1785 switch (tag) {
1786 case JVM_CONSTANT_ClassIndex:
1787 {
1788 jint ki = from_cp->klass_index_at(from_i);
1789 to_cp->klass_index_at_put(to_i, ki);
1790 } break;
1791
1792 case JVM_CONSTANT_Double:
1793 {
1794 jdouble d = from_cp->double_at(from_i);
1795 to_cp->double_at_put(to_i, d);
1796 // double takes two constant pool entries so init second entry's tag
1797 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1798 } break;
1799
1800 case JVM_CONSTANT_Fieldref:
1801 {
1802 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1803 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1804 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1805 } break;
1806
1807 case JVM_CONSTANT_Float:
1808 {
1809 jfloat f = from_cp->float_at(from_i);
1810 to_cp->float_at_put(to_i, f);
1811 } break;
1812
1813 case JVM_CONSTANT_Integer:
1814 {
1815 jint i = from_cp->int_at(from_i);
1816 to_cp->int_at_put(to_i, i);
1817 } break;
1818
1819 case JVM_CONSTANT_InterfaceMethodref:
1820 {
1821 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1822 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1823 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1824 } break;
1825
1826 case JVM_CONSTANT_Long:
1827 {
1828 jlong l = from_cp->long_at(from_i);
1829 to_cp->long_at_put(to_i, l);
1830 // long takes two constant pool entries so init second entry's tag
1831 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1832 } break;
1833
1834 case JVM_CONSTANT_Methodref:
1835 {
1836 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1837 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1838 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1839 } break;
1840
1841 case JVM_CONSTANT_NameAndType:
1842 {
1843 int name_ref_index = from_cp->name_ref_index_at(from_i);
1844 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1845 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1846 } break;
1847
1848 case JVM_CONSTANT_StringIndex:
1849 {
1850 jint si = from_cp->string_index_at(from_i);
1851 to_cp->string_index_at_put(to_i, si);
1852 } break;
1853
1854 case JVM_CONSTANT_Class:
1855 case JVM_CONSTANT_UnresolvedClass:
1856 case JVM_CONSTANT_UnresolvedClassInError:
1857 {
1858 // Revert to JVM_CONSTANT_ClassIndex
1859 int name_index = from_cp->klass_slot_at(from_i).name_index();
1860 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1861 to_cp->klass_index_at_put(to_i, name_index);
1862 } break;
1863
1864 case JVM_CONSTANT_String:
1865 {
1866 Symbol* s = from_cp->unresolved_string_at(from_i);
1867 to_cp->unresolved_string_at_put(to_i, s);
1868 } break;
1869
1870 case JVM_CONSTANT_Utf8:
1871 {
1872 Symbol* s = from_cp->symbol_at(from_i);
1873 // Need to increase refcount, the old one will be thrown away and deferenced
1874 s->increment_refcount();
1875 to_cp->symbol_at_put(to_i, s);
1876 } break;
1877
1878 case JVM_CONSTANT_MethodType:
1879 case JVM_CONSTANT_MethodTypeInError:
1880 {
1881 jint k = from_cp->method_type_index_at(from_i);
1882 to_cp->method_type_index_at_put(to_i, k);
1883 } break;
1884
1885 case JVM_CONSTANT_MethodHandle:
1886 case JVM_CONSTANT_MethodHandleInError:
1887 {
1888 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1889 int k2 = from_cp->method_handle_index_at(from_i);
1890 to_cp->method_handle_index_at_put(to_i, k1, k2);
1891 } break;
1892
1893 case JVM_CONSTANT_Dynamic:
1894 case JVM_CONSTANT_DynamicInError:
1895 {
1896 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1897 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1898 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1899 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1900 } break;
1901
1902 case JVM_CONSTANT_InvokeDynamic:
1903 {
1904 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1905 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1906 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1907 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1908 } break;
1909
1910 // Invalid is used as the tag for the second constant pool entry
1911 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1912 // not be seen by itself.
1913 case JVM_CONSTANT_Invalid: // fall through
1914
1915 default:
1916 {
1917 ShouldNotReachHere();
1918 } break;
1919 }
1920 } // end copy_entry_to()
1921
1922 // Search constant pool search_cp for an entry that matches this
1923 // constant pool's entry at pattern_i. Returns the index of a
1924 // matching entry or zero (0) if there is no matching entry.
1925 int ConstantPool::find_matching_entry(int pattern_i,
1926 const constantPoolHandle& search_cp) {
1927
1928 // index zero (0) is not used
1929 for (int i = 1; i < search_cp->length(); i++) {
1930 bool found = compare_entry_to(pattern_i, search_cp, i);
1931 if (found) {
1932 return i;
1933 }
1934 }
1935
1936 return 0; // entry not found; return unused index zero (0)
1937 } // end find_matching_entry()
1938
1939
1940 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1941 // cp2's bootstrap specifier at idx2.
1942 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2) {
1943 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1944 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1945 bool match = compare_entry_to(k1, cp2, k2);
1946
1947 if (!match) {
1948 return false;
1949 }
1950 int argc = operand_argument_count_at(idx1);
1951 if (argc == cp2->operand_argument_count_at(idx2)) {
1952 for (int j = 0; j < argc; j++) {
1953 k1 = operand_argument_index_at(idx1, j);
1954 k2 = cp2->operand_argument_index_at(idx2, j);
1955 match = compare_entry_to(k1, cp2, k2);
1956 if (!match) {
1957 return false;
1958 }
1959 }
1960 return true; // got through loop; all elements equal
1961 }
1962 return false;
1963 } // end compare_operand_to()
1964
1965 // Search constant pool search_cp for a bootstrap specifier that matches
1966 // this constant pool's bootstrap specifier data at pattern_i index.
1967 // Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1968 int ConstantPool::find_matching_operand(int pattern_i,
1969 const constantPoolHandle& search_cp, int search_len) {
1970 for (int i = 0; i < search_len; i++) {
1971 bool found = compare_operand_to(pattern_i, search_cp, i);
1972 if (found) {
1973 return i;
1974 }
1975 }
1976 return -1; // bootstrap specifier data not found; return unused index (-1)
1977 } // end find_matching_operand()
1978
1979
1980 #ifndef PRODUCT
1981
1982 const char* ConstantPool::printable_name_at(int cp_index) {
1983
1984 constantTag tag = tag_at(cp_index);
1985
1986 if (tag.is_string()) {
1987 return string_at_noresolve(cp_index);
1988 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1989 return klass_name_at(cp_index)->as_C_string();
1990 } else if (tag.is_symbol()) {
1991 return symbol_at(cp_index)->as_C_string();
1992 }
1993 return "";
1994 }
1995
1996 #endif // PRODUCT
1997
1998
1999 // Returns size of constant pool entry.
2000 jint ConstantPool::cpool_entry_size(jint idx) {
2001 switch(tag_at(idx).value()) {
2002 case JVM_CONSTANT_Invalid:
2003 case JVM_CONSTANT_Unicode:
2004 return 1;
2005
2006 case JVM_CONSTANT_Utf8:
2007 return 3 + symbol_at(idx)->utf8_length();
2008
2009 case JVM_CONSTANT_Class:
2010 case JVM_CONSTANT_String:
2011 case JVM_CONSTANT_ClassIndex:
2012 case JVM_CONSTANT_UnresolvedClass:
2013 case JVM_CONSTANT_UnresolvedClassInError:
2014 case JVM_CONSTANT_StringIndex:
2015 case JVM_CONSTANT_MethodType:
2016 case JVM_CONSTANT_MethodTypeInError:
2017 return 3;
2018
2019 case JVM_CONSTANT_MethodHandle:
2020 case JVM_CONSTANT_MethodHandleInError:
2021 return 4; //tag, ref_kind, ref_index
2022
2023 case JVM_CONSTANT_Integer:
2024 case JVM_CONSTANT_Float:
2025 case JVM_CONSTANT_Fieldref:
2026 case JVM_CONSTANT_Methodref:
2027 case JVM_CONSTANT_InterfaceMethodref:
2028 case JVM_CONSTANT_NameAndType:
2029 return 5;
2030
2031 case JVM_CONSTANT_Dynamic:
2032 case JVM_CONSTANT_DynamicInError:
2033 case JVM_CONSTANT_InvokeDynamic:
2034 // u1 tag, u2 bsm, u2 nt
2035 return 5;
2036
2037 case JVM_CONSTANT_Long:
2038 case JVM_CONSTANT_Double:
2039 return 9;
2040 }
2041 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
2042 return 1;
2043 } /* end cpool_entry_size */
2044
2045
2046 // SymbolHash is used to find a constant pool index from a string.
2047 // This function fills in SymbolHashs, one for utf8s and one for
2048 // class names, returns size of the cpool raw bytes.
2049 jint ConstantPool::hash_entries_to(SymbolHash *symmap,
2050 SymbolHash *classmap) {
2051 jint size = 0;
2052
2053 for (u2 idx = 1; idx < length(); idx++) {
2054 u2 tag = tag_at(idx).value();
2055 size += cpool_entry_size(idx);
2056
2057 switch(tag) {
2058 case JVM_CONSTANT_Utf8: {
2059 Symbol* sym = symbol_at(idx);
2060 symmap->add_if_absent(sym, idx);
2061 break;
2062 }
2063 case JVM_CONSTANT_Class:
2064 case JVM_CONSTANT_UnresolvedClass:
2065 case JVM_CONSTANT_UnresolvedClassInError: {
2066 Symbol* sym = klass_name_at(idx);
2067 classmap->add_if_absent(sym, idx);
2068 break;
2069 }
2070 case JVM_CONSTANT_Long:
2071 case JVM_CONSTANT_Double: {
2072 idx++; // Both Long and Double take two cpool slots
2073 break;
2074 }
2075 }
2076 }
2077 return size;
2078 } /* end hash_utf8_entries_to */
2079
2080
2081 // Copy cpool bytes.
2082 // Returns:
2083 // 0, in case of OutOfMemoryError
2084 // -1, in case of internal error
2085 // > 0, count of the raw cpool bytes that have been copied
2086 int ConstantPool::copy_cpool_bytes(int cpool_size,
2087 SymbolHash* tbl,
2088 unsigned char *bytes) {
2089 u2 idx1, idx2;
2090 jint size = 0;
2091 jint cnt = length();
2092 unsigned char *start_bytes = bytes;
2093
2094 for (jint idx = 1; idx < cnt; idx++) {
2095 u1 tag = tag_at(idx).value();
2096 jint ent_size = cpool_entry_size(idx);
2097
2098 assert(size + ent_size <= cpool_size, "Size mismatch");
2099
2100 *bytes = tag;
2101 switch(tag) {
2102 case JVM_CONSTANT_Invalid: {
2103 break;
2104 }
2105 case JVM_CONSTANT_Unicode: {
2106 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2107 break;
2108 }
2109 case JVM_CONSTANT_Utf8: {
2110 Symbol* sym = symbol_at(idx);
2111 char* str = sym->as_utf8();
2112 // Warning! It's crashing on x86 with len = sym->utf8_length()
2113 int len = (int) strlen(str);
2114 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2115 for (int i = 0; i < len; i++) {
2116 bytes[3+i] = (u1) str[i];
2117 }
2118 break;
2119 }
2120 case JVM_CONSTANT_Integer: {
2121 jint val = int_at(idx);
2122 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2123 break;
2124 }
2125 case JVM_CONSTANT_Float: {
2126 jfloat val = float_at(idx);
2127 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2128 break;
2129 }
2130 case JVM_CONSTANT_Long: {
2131 jlong val = long_at(idx);
2132 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2133 idx++; // Long takes two cpool slots
2134 break;
2135 }
2136 case JVM_CONSTANT_Double: {
2137 jdouble val = double_at(idx);
2138 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2139 idx++; // Double takes two cpool slots
2140 break;
2141 }
2142 case JVM_CONSTANT_Class:
2143 case JVM_CONSTANT_UnresolvedClass:
2144 case JVM_CONSTANT_UnresolvedClassInError: {
2145 *bytes = JVM_CONSTANT_Class;
2146 Symbol* sym = klass_name_at(idx);
2147 idx1 = tbl->symbol_to_value(sym);
2148 assert(idx1 != 0, "Have not found a hashtable entry");
2149 Bytes::put_Java_u2((address) (bytes+1), idx1);
2150 break;
2151 }
2152 case JVM_CONSTANT_String: {
2153 *bytes = JVM_CONSTANT_String;
2154 Symbol* sym = unresolved_string_at(idx);
2155 idx1 = tbl->symbol_to_value(sym);
2156 assert(idx1 != 0, "Have not found a hashtable entry");
2157 Bytes::put_Java_u2((address) (bytes+1), idx1);
2158 break;
2159 }
2160 case JVM_CONSTANT_Fieldref:
2161 case JVM_CONSTANT_Methodref:
2162 case JVM_CONSTANT_InterfaceMethodref: {
2163 idx1 = uncached_klass_ref_index_at(idx);
2164 idx2 = uncached_name_and_type_ref_index_at(idx);
2165 Bytes::put_Java_u2((address) (bytes+1), idx1);
2166 Bytes::put_Java_u2((address) (bytes+3), idx2);
2167 break;
2168 }
2169 case JVM_CONSTANT_NameAndType: {
2170 idx1 = name_ref_index_at(idx);
2171 idx2 = signature_ref_index_at(idx);
2172 Bytes::put_Java_u2((address) (bytes+1), idx1);
2173 Bytes::put_Java_u2((address) (bytes+3), idx2);
2174 break;
2175 }
2176 case JVM_CONSTANT_ClassIndex: {
2177 *bytes = JVM_CONSTANT_Class;
2178 idx1 = checked_cast<u2>(klass_index_at(idx));
2179 Bytes::put_Java_u2((address) (bytes+1), idx1);
2180 break;
2181 }
2182 case JVM_CONSTANT_StringIndex: {
2183 *bytes = JVM_CONSTANT_String;
2184 idx1 = checked_cast<u2>(string_index_at(idx));
2185 Bytes::put_Java_u2((address) (bytes+1), idx1);
2186 break;
2187 }
2188 case JVM_CONSTANT_MethodHandle:
2189 case JVM_CONSTANT_MethodHandleInError: {
2190 *bytes = JVM_CONSTANT_MethodHandle;
2191 int kind = method_handle_ref_kind_at(idx);
2192 idx1 = checked_cast<u2>(method_handle_index_at(idx));
2193 *(bytes+1) = (unsigned char) kind;
2194 Bytes::put_Java_u2((address) (bytes+2), idx1);
2195 break;
2196 }
2197 case JVM_CONSTANT_MethodType:
2198 case JVM_CONSTANT_MethodTypeInError: {
2199 *bytes = JVM_CONSTANT_MethodType;
2200 idx1 = checked_cast<u2>(method_type_index_at(idx));
2201 Bytes::put_Java_u2((address) (bytes+1), idx1);
2202 break;
2203 }
2204 case JVM_CONSTANT_Dynamic:
2205 case JVM_CONSTANT_DynamicInError: {
2206 *bytes = tag;
2207 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2208 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2209 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2210 Bytes::put_Java_u2((address) (bytes+1), idx1);
2211 Bytes::put_Java_u2((address) (bytes+3), idx2);
2212 break;
2213 }
2214 case JVM_CONSTANT_InvokeDynamic: {
2215 *bytes = tag;
2216 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2217 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2218 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2219 Bytes::put_Java_u2((address) (bytes+1), idx1);
2220 Bytes::put_Java_u2((address) (bytes+3), idx2);
2221 break;
2222 }
2223 }
2224 bytes += ent_size;
2225 size += ent_size;
2226 }
2227 assert(size == cpool_size, "Size mismatch");
2228
2229 return (int)(bytes - start_bytes);
2230 } /* end copy_cpool_bytes */
2231
2232 bool ConstantPool::is_maybe_on_stack() const {
2233 // This method uses the similar logic as nmethod::is_maybe_on_stack()
2234 if (!Continuations::enabled()) {
2235 return false;
2236 }
2237
2238 // If the condition below is true, it means that the nmethod was found to
2239 // be alive the previous completed marking cycle.
2240 return cache()->gc_epoch() >= CodeCache::previous_completed_gc_marking_cycle();
2241 }
2242
2243 // For redefinition, if any methods found in loom stack chunks, the gc_epoch is
2244 // recorded in their constant pool cache. The on_stack-ness of the constant pool controls whether
2245 // memory for the method is reclaimed.
2246 bool ConstantPool::on_stack() const {
2247 if ((_flags &_on_stack) != 0) {
2248 return true;
2249 }
2250
2251 if (_cache == nullptr) {
2252 return false;
2253 }
2254
2255 return is_maybe_on_stack();
2256 }
2257
2258 void ConstantPool::set_on_stack(const bool value) {
2259 if (value) {
2260 // Only record if it's not already set.
2261 if (!on_stack()) {
2262 assert(!is_shared(), "should always be set for shared constant pools");
2263 _flags |= _on_stack;
2264 MetadataOnStackMark::record(this);
2265 }
2266 } else {
2267 // Clearing is done single-threadedly.
2268 if (!is_shared()) {
2269 _flags &= (u2)(~_on_stack);
2270 }
2271 }
2272 }
2273
2274 // Printing
2275
2276 void ConstantPool::print_on(outputStream* st) const {
2277 assert(is_constantPool(), "must be constantPool");
2278 st->print_cr("%s", internal_name());
2279 if (flags() != 0) {
2280 st->print(" - flags: 0x%x", flags());
2281 if (has_preresolution()) st->print(" has_preresolution");
2282 if (on_stack()) st->print(" on_stack");
2283 st->cr();
2284 }
2285 if (pool_holder() != nullptr) {
2286 st->print_cr(" - holder: " PTR_FORMAT, p2i(pool_holder()));
2287 }
2288 st->print_cr(" - cache: " PTR_FORMAT, p2i(cache()));
2289 st->print_cr(" - resolved_references: " PTR_FORMAT, p2i(resolved_references_or_null()));
2290 st->print_cr(" - reference_map: " PTR_FORMAT, p2i(reference_map()));
2291 st->print_cr(" - resolved_klasses: " PTR_FORMAT, p2i(resolved_klasses()));
2292 st->print_cr(" - cp length: %d", length());
2293
2294 for (int index = 1; index < length(); index++) { // Index 0 is unused
2295 ((ConstantPool*)this)->print_entry_on(index, st);
2296 switch (tag_at(index).value()) {
2297 case JVM_CONSTANT_Long :
2298 case JVM_CONSTANT_Double :
2299 index++; // Skip entry following eigth-byte constant
2300 }
2301
2302 }
2303 st->cr();
2304 }
2305
2306 // Print one constant pool entry
2307 void ConstantPool::print_entry_on(const int cp_index, outputStream* st) {
2308 EXCEPTION_MARK;
2309 st->print(" - %3d : ", cp_index);
2310 tag_at(cp_index).print_on(st);
2311 st->print(" : ");
2312 switch (tag_at(cp_index).value()) {
2313 case JVM_CONSTANT_Class :
2314 { Klass* k = klass_at(cp_index, CATCH);
2315 guarantee(k != nullptr, "need klass");
2316 k->print_value_on(st);
2317 st->print(" {" PTR_FORMAT "}", p2i(k));
2318 }
2319 break;
2320 case JVM_CONSTANT_Fieldref :
2321 case JVM_CONSTANT_Methodref :
2322 case JVM_CONSTANT_InterfaceMethodref :
2323 st->print("klass_index=%d", uncached_klass_ref_index_at(cp_index));
2324 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(cp_index));
2325 break;
2326 case JVM_CONSTANT_String :
2327 unresolved_string_at(cp_index)->print_value_on(st);
2328 break;
2329 case JVM_CONSTANT_Integer :
2330 st->print("%d", int_at(cp_index));
2331 break;
2332 case JVM_CONSTANT_Float :
2333 st->print("%f", float_at(cp_index));
2334 break;
2335 case JVM_CONSTANT_Long :
2336 st->print_jlong(long_at(cp_index));
2337 break;
2338 case JVM_CONSTANT_Double :
2339 st->print("%lf", double_at(cp_index));
2340 break;
2341 case JVM_CONSTANT_NameAndType :
2342 st->print("name_index=%d", name_ref_index_at(cp_index));
2343 st->print(" signature_index=%d", signature_ref_index_at(cp_index));
2344 break;
2345 case JVM_CONSTANT_Utf8 :
2346 symbol_at(cp_index)->print_value_on(st);
2347 break;
2348 case JVM_CONSTANT_ClassIndex: {
2349 int name_index = *int_at_addr(cp_index);
2350 st->print("klass_index=%d ", name_index);
2351 symbol_at(name_index)->print_value_on(st);
2352 }
2353 break;
2354 case JVM_CONSTANT_UnresolvedClass : // fall-through
2355 case JVM_CONSTANT_UnresolvedClassInError: {
2356 CPKlassSlot kslot = klass_slot_at(cp_index);
2357 int resolved_klass_index = kslot.resolved_klass_index();
2358 int name_index = kslot.name_index();
2359 assert(tag_at(name_index).is_symbol(), "sanity");
2360 symbol_at(name_index)->print_value_on(st);
2361 }
2362 break;
2363 case JVM_CONSTANT_MethodHandle :
2364 case JVM_CONSTANT_MethodHandleInError :
2365 st->print("ref_kind=%d", method_handle_ref_kind_at(cp_index));
2366 st->print(" ref_index=%d", method_handle_index_at(cp_index));
2367 break;
2368 case JVM_CONSTANT_MethodType :
2369 case JVM_CONSTANT_MethodTypeInError :
2370 st->print("signature_index=%d", method_type_index_at(cp_index));
2371 break;
2372 case JVM_CONSTANT_Dynamic :
2373 case JVM_CONSTANT_DynamicInError :
2374 {
2375 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(cp_index));
2376 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(cp_index));
2377 int argc = bootstrap_argument_count_at(cp_index);
2378 if (argc > 0) {
2379 for (int arg_i = 0; arg_i < argc; arg_i++) {
2380 int arg = bootstrap_argument_index_at(cp_index, arg_i);
2381 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2382 }
2383 st->print("}");
2384 }
2385 }
2386 break;
2387 case JVM_CONSTANT_InvokeDynamic :
2388 {
2389 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(cp_index));
2390 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(cp_index));
2391 int argc = bootstrap_argument_count_at(cp_index);
2392 if (argc > 0) {
2393 for (int arg_i = 0; arg_i < argc; arg_i++) {
2394 int arg = bootstrap_argument_index_at(cp_index, arg_i);
2395 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2396 }
2397 st->print("}");
2398 }
2399 }
2400 break;
2401 default:
2402 ShouldNotReachHere();
2403 break;
2404 }
2405 st->cr();
2406 }
2407
2408 void ConstantPool::print_value_on(outputStream* st) const {
2409 assert(is_constantPool(), "must be constantPool");
2410 st->print("constant pool [%d]", length());
2411 if (has_preresolution()) st->print("/preresolution");
2412 if (operands() != nullptr) st->print("/operands[%d]", operands()->length());
2413 print_address_on(st);
2414 if (pool_holder() != nullptr) {
2415 st->print(" for ");
2416 pool_holder()->print_value_on(st);
2417 bool extra = (pool_holder()->constants() != this);
2418 if (extra) st->print(" (extra)");
2419 }
2420 if (cache() != nullptr) {
2421 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2422 }
2423 }
2424
2425 // Verification
2426
2427 void ConstantPool::verify_on(outputStream* st) {
2428 guarantee(is_constantPool(), "object must be constant pool");
2429 for (int i = 0; i< length(); i++) {
2430 constantTag tag = tag_at(i);
2431 if (tag.is_klass() || tag.is_unresolved_klass()) {
2432 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2433 } else if (tag.is_symbol()) {
2434 Symbol* entry = symbol_at(i);
2435 guarantee(entry->refcount() != 0, "should have nonzero reference count");
2436 } else if (tag.is_string()) {
2437 Symbol* entry = unresolved_string_at(i);
2438 guarantee(entry->refcount() != 0, "should have nonzero reference count");
2439 }
2440 }
2441 if (pool_holder() != nullptr) {
2442 // Note: pool_holder() can be null in temporary constant pools
2443 // used during constant pool merging
2444 guarantee(pool_holder()->is_klass(), "should be klass");
2445 }
2446 }