1 /*
2 * Copyright (c) 1997, 2022, 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 "precompiled.hpp"
26 #include "jvm.h"
27 #include "cds/archiveHeapLoader.hpp"
28 #include "cds/heapShared.hpp"
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/javaClasses.inline.hpp"
31 #include "classfile/metadataOnStackMark.hpp"
32 #include "classfile/stringTable.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmClasses.hpp"
35 #include "classfile/vmSymbols.hpp"
36 #include "code/codeCache.hpp"
37 #include "interpreter/bootstrapInfo.hpp"
38 #include "interpreter/linkResolver.hpp"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "memory/allocation.inline.hpp"
42 #include "memory/metadataFactory.hpp"
43 #include "memory/metaspaceClosure.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/array.hpp"
48 #include "oops/constantPool.inline.hpp"
49 #include "oops/cpCache.inline.hpp"
50 #include "oops/flatArrayKlass.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/klass.inline.hpp"
53 #include "oops/objArrayKlass.hpp"
54 #include "oops/objArrayOop.inline.hpp"
55 #include "oops/oop.inline.hpp"
56 #include "oops/typeArrayOop.inline.hpp"
57 #include "prims/jvmtiExport.hpp"
58 #include "runtime/atomic.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/init.hpp"
61 #include "runtime/javaCalls.hpp"
62 #include "runtime/javaThread.hpp"
63 #include "runtime/signature.hpp"
64 #include "runtime/vframe.inline.hpp"
65 #include "utilities/copy.hpp"
66
67 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
68 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
69 int size = ConstantPool::size(length);
70 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
71 }
72
73 void ConstantPool::copy_fields(const ConstantPool* orig) {
74 // Preserve dynamic constant information from the original pool
75 if (orig->has_dynamic_constant()) {
76 set_has_dynamic_constant();
77 }
78
79 set_major_version(orig->major_version());
80 set_minor_version(orig->minor_version());
81
82 set_source_file_name_index(orig->source_file_name_index());
83 set_generic_signature_index(orig->generic_signature_index());
84 }
85
86 #ifdef ASSERT
87
88 // MetaspaceObj allocation invariant is calloc equivalent memory
89 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
90 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
91 assert(tags != NULL, "invariant");
92 const int length = tags->length();
93 for (int index = 0; index < length; ++index) {
94 if (JVM_CONSTANT_Invalid != tags->at(index)) {
95 return false;
96 }
97 }
98 return true;
99 }
100
101 #endif
102
103 ConstantPool::ConstantPool(Array<u1>* tags) :
104 _tags(tags),
105 _length(tags->length()) {
106
107 assert(_tags != NULL, "invariant");
108 assert(tags->length() == _length, "invariant");
109 assert(tag_array_is_zero_initialized(tags), "invariant");
110 assert(0 == flags(), "invariant");
111 assert(0 == version(), "invariant");
112 assert(NULL == _pool_holder, "invariant");
113 }
114
115 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
116 if (cache() != NULL) {
117 MetadataFactory::free_metadata(loader_data, cache());
118 set_cache(NULL);
119 }
120
121 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
122 set_resolved_klasses(NULL);
123
124 MetadataFactory::free_array<jushort>(loader_data, operands());
125 set_operands(NULL);
126
127 release_C_heap_structures();
128
129 // free tag array
130 MetadataFactory::free_array<u1>(loader_data, tags());
131 set_tags(NULL);
132 }
133
134 void ConstantPool::release_C_heap_structures() {
135 // walk constant pool and decrement symbol reference counts
136 unreference_symbols();
137 }
138
139 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
140 log_trace(cds)("Iter(ConstantPool): %p", this);
141
142 it->push(&_tags, MetaspaceClosure::_writable);
143 it->push(&_cache);
144 it->push(&_pool_holder);
145 it->push(&_operands);
146 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
147
148 for (int i = 0; i < length(); i++) {
149 // The only MSO's embedded in the CP entries are Symbols:
150 // JVM_CONSTANT_String (normal and pseudo)
151 // JVM_CONSTANT_Utf8
152 constantTag ctag = tag_at(i);
153 if (ctag.is_string() || ctag.is_utf8()) {
154 it->push(symbol_at_addr(i));
155 }
156 }
157 }
158
159 objArrayOop ConstantPool::resolved_references() const {
160 return (objArrayOop)_cache->resolved_references();
161 }
162
163 // Called from outside constant pool resolution where a resolved_reference array
164 // may not be present.
165 objArrayOop ConstantPool::resolved_references_or_null() const {
166 if (_cache == NULL) {
167 return NULL;
168 } else {
169 return (objArrayOop)_cache->resolved_references();
170 }
171 }
172
173 // Create resolved_references array and mapping array for original cp indexes
174 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
175 // to map it back for resolving and some unlikely miscellaneous uses.
176 // The objects created by invokedynamic are appended to this list.
177 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
178 const intStack& reference_map,
179 int constant_pool_map_length,
180 TRAPS) {
181 // Initialized the resolved object cache.
182 int map_length = reference_map.length();
183 if (map_length > 0) {
184 // Only need mapping back to constant pool entries. The map isn't used for
185 // invokedynamic resolved_reference entries. For invokedynamic entries,
186 // the constant pool cache index has the mapping back to both the constant
187 // pool and to the resolved reference index.
188 if (constant_pool_map_length > 0) {
189 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
190
191 for (int i = 0; i < constant_pool_map_length; i++) {
192 int x = reference_map.at(i);
193 assert(x == (int)(jushort) x, "klass index is too big");
194 om->at_put(i, (jushort)x);
195 }
196 set_reference_map(om);
197 }
198
199 // Create Java array for holding resolved strings, methodHandles,
200 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
201 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK);
202 Handle refs_handle (THREAD, stom); // must handleize.
203 set_resolved_references(loader_data->add_handle(refs_handle));
204 }
205 }
206
207 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
208 // A ConstantPool can't possibly have 0xffff valid class entries,
209 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
210 // entry for the class's name. So at most we will have 0xfffe class entries.
211 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
212 // UnresolvedKlass entries that are temporarily created during class redefinition.
213 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
214 assert(resolved_klasses() == NULL, "sanity");
215 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
216 set_resolved_klasses(rk);
217 }
218
219 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
220 int len = length();
221 int num_klasses = 0;
222 for (int i = 1; i <len; i++) {
223 switch (tag_at(i).value()) {
224 case JVM_CONSTANT_ClassIndex:
225 {
226 const int class_index = klass_index_at(i);
227 unresolved_klass_at_put(i, class_index, num_klasses++);
228 }
229 break;
230 #ifndef PRODUCT
231 case JVM_CONSTANT_Class:
232 case JVM_CONSTANT_UnresolvedClass:
233 case JVM_CONSTANT_UnresolvedClassInError:
234 // All of these should have been reverted back to Unresolved before calling
235 // this function.
236 ShouldNotReachHere();
237 #endif
238 }
239 }
240 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
241 }
242
243 // Hidden class support:
244 void ConstantPool::klass_at_put(int class_index, Klass* k) {
245 assert(k != NULL, "must be valid klass");
246 CPKlassSlot kslot = klass_slot_at(class_index);
247 int resolved_klass_index = kslot.resolved_klass_index();
248 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
249 Atomic::release_store(adr, k);
250
251 // The interpreter assumes when the tag is stored, the klass is resolved
252 // and the Klass* non-NULL, so we need hardware store ordering here.
253 assert(!k->name()->is_Q_signature(), "Q-type without JVM_CONSTANT_QDescBit");
254 release_tag_at_put(class_index, JVM_CONSTANT_Class);
255 }
256
257 #if INCLUDE_CDS_JAVA_HEAP
258 // Archive the resolved references
259 void ConstantPool::archive_resolved_references() {
260 if (_cache == NULL) {
261 return; // nothing to do
262 }
263
264 InstanceKlass *ik = pool_holder();
265 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() ||
266 ik->is_shared_app_class())) {
267 // Archiving resolved references for classes from non-builtin loaders
268 // is not yet supported.
269 return;
270 }
271
272 objArrayOop rr = resolved_references();
273 Array<u2>* ref_map = reference_map();
274 if (rr != NULL) {
275 int ref_map_len = ref_map == NULL ? 0 : ref_map->length();
276 int rr_len = rr->length();
277 for (int i = 0; i < rr_len; i++) {
278 oop obj = rr->obj_at(i);
279 rr->obj_at_put(i, NULL);
280 if (obj != NULL && i < ref_map_len) {
281 int index = object_to_cp_index(i);
282 if (tag_at(index).is_string()) {
283 oop archived_string = HeapShared::find_archived_heap_object(obj);
284 // Update the reference to point to the archived copy
285 // of this string.
286 // If the string is too large to archive, NULL is
287 // stored into rr. At run time, string_at_impl() will create and intern
288 // the string.
289 rr->obj_at_put(i, archived_string);
290 }
291 }
292 }
293
294 oop archived = HeapShared::archive_object(rr);
295 // If the resolved references array is not archived (too large),
296 // the 'archived' object is NULL. No need to explicitly check
297 // the return value of archive_object() here. At runtime, the
298 // resolved references will be created using the normal process
299 // when there is no archived value.
300 _cache->set_archived_references(archived);
301 }
302 }
303
304 void ConstantPool::resolve_class_constants(TRAPS) {
305 assert(DumpSharedSpaces, "used during dump time only");
306 // The _cache may be NULL if the _pool_holder klass fails verification
307 // at dump time due to missing dependencies.
308 if (cache() == NULL || reference_map() == NULL) {
309 return; // nothing to do
310 }
311
312 constantPoolHandle cp(THREAD, this);
313 for (int index = 1; index < length(); index++) { // Index 0 is unused
314 if (tag_at(index).is_string()) {
315 int cache_index = cp->cp_to_object_index(index);
316 string_at_impl(cp, index, cache_index, CHECK);
317 }
318 }
319 }
320
321 void ConstantPool::add_dumped_interned_strings() {
322 objArrayOop rr = resolved_references();
323 if (rr != NULL) {
324 int rr_len = rr->length();
325 for (int i = 0; i < rr_len; i++) {
326 oop p = rr->obj_at(i);
327 if (java_lang_String::is_instance(p)) {
328 HeapShared::add_to_dumped_interned_strings(p);
329 }
330 }
331 }
332 }
333 #endif
334
335 #if INCLUDE_CDS
336 // CDS support. Create a new resolved_references array.
337 void ConstantPool::restore_unshareable_info(TRAPS) {
338 if (!_pool_holder->is_linked() && !_pool_holder->is_rewritten()) {
339 return;
340 }
341 assert(is_constantPool(), "ensure C++ vtable is restored");
342 assert(on_stack(), "should always be set for shared constant pools");
343 assert(is_shared(), "should always be set for shared constant pools");
344 assert(_cache != NULL, "constant pool _cache should not be NULL");
345
346 // Only create the new resolved references array if it hasn't been attempted before
347 if (resolved_references() != NULL) return;
348
349 if (vmClasses::Object_klass_loaded()) {
350 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
351 #if INCLUDE_CDS_JAVA_HEAP
352 if (ArchiveHeapLoader::is_fully_available() &&
353 _cache->archived_references() != NULL) {
354 oop archived = _cache->archived_references();
355 // Create handle for the archived resolved reference array object
356 Handle refs_handle(THREAD, archived);
357 set_resolved_references(loader_data->add_handle(refs_handle));
358 _cache->clear_archived_references();
359 } else
360 #endif
361 {
362 // No mapped archived resolved reference array
363 // Recreate the object array and add to ClassLoaderData.
364 int map_length = resolved_reference_length();
365 if (map_length > 0) {
366 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK);
367 Handle refs_handle(THREAD, stom); // must handleize.
368 set_resolved_references(loader_data->add_handle(refs_handle));
369 }
370 }
371 }
372 }
373
374 void ConstantPool::remove_unshareable_info() {
375 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
376 // The _on_stack flag is used to prevent ConstantPools from deallocation during
377 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
378 // we always set _on_stack to true to avoid having to change _flags during runtime.
379 _flags |= (_on_stack | _is_shared);
380
381 if (!_pool_holder->is_linked() && !_pool_holder->verified_at_dump_time()) {
382 return;
383 }
384 // Resolved references are not in the shared archive.
385 // Save the length for restoration. It is not necessarily the same length
386 // as reference_map.length() if invokedynamic is saved. It is needed when
387 // re-creating the resolved reference array if archived heap data cannot be map
388 // at runtime.
389 set_resolved_reference_length(
390 resolved_references() != NULL ? resolved_references()->length() : 0);
391 set_resolved_references(OopHandle());
392
393 int num_klasses = 0;
394 for (int index = 1; index < length(); index++) { // Index 0 is unused
395 jbyte qdesc_bit = tag_at(index).is_Qdescriptor_klass() ? (jbyte) JVM_CONSTANT_QDescBit : 0;
396 if (tag_at(index).is_unresolved_klass_in_error()) {
397 tag_at_put(index, JVM_CONSTANT_UnresolvedClass | qdesc_bit);
398 } else if (tag_at(index).is_method_handle_in_error()) {
399 tag_at_put(index, JVM_CONSTANT_MethodHandle);
400 } else if (tag_at(index).is_method_type_in_error()) {
401 tag_at_put(index, JVM_CONSTANT_MethodType);
402 } else if (tag_at(index).is_dynamic_constant_in_error()) {
403 tag_at_put(index, JVM_CONSTANT_Dynamic);
404 }
405 if (tag_at(index).is_klass()) {
406 // This class was resolved as a side effect of executing Java code
407 // during dump time. We need to restore it back to an UnresolvedClass,
408 // so that the proper class loading and initialization can happen
409 // at runtime.
410 bool clear_it = true;
411 if (pool_holder()->is_hidden() && index == pool_holder()->this_class_index()) {
412 // All references to a hidden class's own field/methods are through this
413 // index. We cannot clear it. See comments in ClassFileParser::fill_instance_klass.
414 clear_it = false;
415 }
416 if (clear_it) {
417 CPKlassSlot kslot = klass_slot_at(index);
418 int resolved_klass_index = kslot.resolved_klass_index();
419 int name_index = kslot.name_index();
420 assert(tag_at(name_index).is_symbol(), "sanity");
421 resolved_klasses()->at_put(resolved_klass_index, NULL);
422 tag_at_put(index, JVM_CONSTANT_UnresolvedClass | qdesc_bit);
423 assert(klass_name_at(index) == symbol_at(name_index), "sanity");
424 }
425 }
426 }
427 if (cache() != NULL) {
428 // cache() is NULL if this class is not yet linked.
429 cache()->remove_unshareable_info();
430 }
431 }
432 #endif // INCLUDE_CDS
433
434 int ConstantPool::cp_to_object_index(int cp_index) {
435 // this is harder don't do this so much.
436 int i = reference_map()->find(cp_index);
437 // We might not find the index for jsr292 call.
438 return (i < 0) ? _no_index_sentinel : i;
439 }
440
441 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
442 resolved_references()->obj_at_put(obj_index, str);
443 }
444
445 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
446 ResourceMark rm;
447 int line_number = -1;
448 const char * source_file = NULL;
449 if (JavaThread::current()->has_last_Java_frame()) {
450 // try to identify the method which called this function.
451 vframeStream vfst(JavaThread::current());
452 if (!vfst.at_end()) {
453 line_number = vfst.method()->line_number_from_bci(vfst.bci());
454 Symbol* s = vfst.method()->method_holder()->source_file_name();
455 if (s != NULL) {
456 source_file = s->as_C_string();
457 }
458 }
459 }
460 if (k != this_cp->pool_holder()) {
461 // only print something if the classes are different
462 if (source_file != NULL) {
463 log_debug(class, resolve)("%s %s %s:%d",
464 this_cp->pool_holder()->external_name(),
465 k->external_name(), source_file, line_number);
466 } else {
467 log_debug(class, resolve)("%s %s",
468 this_cp->pool_holder()->external_name(),
469 k->external_name());
470 }
471 }
472 }
473
474 void check_is_inline_type(Klass* k, TRAPS) {
475 if (!k->is_inline_klass()) {
476 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
477 }
478 }
479
480 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
481 TRAPS) {
482 JavaThread* javaThread = THREAD;
483
484 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
485 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
486 // the entry and tag is not updated atomically.
487 CPKlassSlot kslot = this_cp->klass_slot_at(which);
488 int resolved_klass_index = kslot.resolved_klass_index();
489 int name_index = kslot.name_index();
490 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
491
492 // The tag must be JVM_CONSTANT_Class in order to read the correct value from
493 // the unresolved_klasses() array.
494 if (this_cp->tag_at(which).is_klass()) {
495 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
496 if (klass != NULL) {
497 return klass;
498 }
499 }
500
501 // This tag doesn't change back to unresolved class unless at a safepoint.
502 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
503 // The original attempt to resolve this constant pool entry failed so find the
504 // class of the original error and throw another error of the same class
505 // (JVMS 5.4.3).
506 // If there is a detail message, pass that detail message to the error.
507 // The JVMS does not strictly require us to duplicate the same detail message,
508 // or any internal exception fields such as cause or stacktrace. But since the
509 // detail message is often a class name or other literal string, we will repeat it
510 // if we can find it in the symbol table.
511 throw_resolution_error(this_cp, which, CHECK_NULL);
512 ShouldNotReachHere();
513 }
514
515 Handle mirror_handle;
516 Symbol* name = this_cp->symbol_at(name_index);
517 bool inline_type_signature = false;
518 if (name->is_Q_signature()) {
519 name = name->fundamental_name(THREAD);
520 inline_type_signature = true;
521 }
522 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
523 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
524
525 Klass* k;
526 {
527 // Turn off the single stepping while doing class resolution
528 JvmtiHideSingleStepping jhss(javaThread);
529 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
530 } // JvmtiHideSingleStepping jhss(javaThread);
531 if (inline_type_signature) {
532 name->decrement_refcount();
533 }
534
535 if (!HAS_PENDING_EXCEPTION) {
536 // preserve the resolved klass from unloading
537 mirror_handle = Handle(THREAD, k->java_mirror());
538 // Do access check for klasses
539 verify_constant_pool_resolve(this_cp, k, THREAD);
540 }
541
542 if (!HAS_PENDING_EXCEPTION && inline_type_signature) {
543 check_is_inline_type(k, THREAD);
544 }
545
546 if (!HAS_PENDING_EXCEPTION) {
547 Klass* bottom_klass = NULL;
548 if (k->is_objArray_klass()) {
549 bottom_klass = ObjArrayKlass::cast(k)->bottom_klass();
550 assert(bottom_klass != NULL, "Should be set");
551 assert(bottom_klass->is_instance_klass() || bottom_klass->is_typeArray_klass(), "Sanity check");
552 } else if (k->is_flatArray_klass()) {
553 bottom_klass = FlatArrayKlass::cast(k)->element_klass();
554 assert(bottom_klass != NULL, "Should be set");
555 }
556 }
557
558 // Failed to resolve class. We must record the errors so that subsequent attempts
559 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
560 if (HAS_PENDING_EXCEPTION) {
561 jbyte tag = JVM_CONSTANT_UnresolvedClass;
562 if (this_cp->tag_at(which).is_Qdescriptor_klass()) {
563 tag |= JVM_CONSTANT_QDescBit;
564 }
565 save_and_throw_exception(this_cp, which, constantTag(tag), CHECK_NULL);
566 // If CHECK_NULL above doesn't return the exception, that means that
567 // some other thread has beaten us and has resolved the class.
568 // To preserve old behavior, we return the resolved class.
569 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
570 assert(klass != NULL, "must be resolved if exception was cleared");
571 return klass;
572 }
573
574 // logging for class+resolve.
575 if (log_is_enabled(Debug, class, resolve)){
576 trace_class_resolution(this_cp, k);
577 }
578
579 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
580 Atomic::release_store(adr, k);
581 // The interpreter assumes when the tag is stored, the klass is resolved
582 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
583 // hardware store ordering here.
584 jbyte tag = JVM_CONSTANT_Class;
585 if (this_cp->tag_at(which).is_Qdescriptor_klass()) {
586 tag |= JVM_CONSTANT_QDescBit;
587 }
588 // We also need to CAS to not overwrite an error from a racing thread.
589
590 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
591 (jbyte)JVM_CONSTANT_UnresolvedClass,
592 tag);
593
594 // We need to recheck exceptions from racing thread and return the same.
595 if (old_tag == JVM_CONSTANT_UnresolvedClassInError) {
596 // Remove klass.
597 this_cp->resolved_klasses()->at_put(resolved_klass_index, NULL);
598 throw_resolution_error(this_cp, which, CHECK_NULL);
599 }
600
601 return k;
602 }
603
604
605 // Does not update ConstantPool* - to avoid any exception throwing. Used
606 // by compiler and exception handling. Also used to avoid classloads for
607 // instanceof operations. Returns NULL if the class has not been loaded or
608 // if the verification of constant pool failed
609 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
610 CPKlassSlot kslot = this_cp->klass_slot_at(which);
611 int resolved_klass_index = kslot.resolved_klass_index();
612 int name_index = kslot.name_index();
613 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
614
615 if (this_cp->tag_at(which).is_klass()) {
616 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
617 assert(k != NULL, "should be resolved");
618 return k;
619 } else if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
620 return NULL;
621 } else {
622 Thread* current = Thread::current();
623 Symbol* name = this_cp->symbol_at(name_index);
624 oop loader = this_cp->pool_holder()->class_loader();
625 oop protection_domain = this_cp->pool_holder()->protection_domain();
626 Handle h_prot (current, protection_domain);
627 Handle h_loader (current, loader);
628 Klass* k = SystemDictionary::find_instance_klass(current, name, h_loader, h_prot);
629
630 // Avoid constant pool verification at a safepoint, as it takes the Module_lock.
631 if (k != NULL && current->is_Java_thread()) {
632 // Make sure that resolving is legal
633 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
634 ExceptionMark em(THREAD);
635 // return NULL if verification fails
636 verify_constant_pool_resolve(this_cp, k, THREAD);
637 if (HAS_PENDING_EXCEPTION) {
638 CLEAR_PENDING_EXCEPTION;
639 return NULL;
640 }
641 return k;
642 } else {
643 return k;
644 }
645 }
646 }
647
648 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
649 int which) {
650 if (cpool->cache() == NULL) return NULL; // nothing to load yet
651 int cache_index = decode_cpcache_index(which, true);
652 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
653 // FIXME: should be an assert
654 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
655 return NULL;
656 }
657 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
658 return e->method_if_resolved(cpool);
659 }
660
661
662 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
663 if (cpool->cache() == NULL) return false; // nothing to load yet
664 int cache_index = decode_cpcache_index(which, true);
665 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
666 return e->has_appendix();
667 }
668
669 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
670 if (cpool->cache() == NULL) return NULL; // nothing to load yet
671 int cache_index = decode_cpcache_index(which, true);
672 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
673 return e->appendix_if_resolved(cpool);
674 }
675
676
677 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) {
678 if (cpool->cache() == NULL) return false; // nothing to load yet
679 int cache_index = decode_cpcache_index(which, true);
680 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
681 return e->has_local_signature();
682 }
683
684 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
685 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
686 return symbol_at(name_index);
687 }
688
689
690 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
691 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
692 return symbol_at(signature_index);
693 }
694
695 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
696 int i = which;
697 if (!uncached && cache() != NULL) {
698 if (ConstantPool::is_invokedynamic_index(which)) {
699 // Invokedynamic index is index into the constant pool cache
700 int pool_index = invokedynamic_bootstrap_ref_index_at(which);
701 pool_index = bootstrap_name_and_type_ref_index_at(pool_index);
702 assert(tag_at(pool_index).is_name_and_type(), "");
703 return pool_index;
704 }
705 // change byte-ordering and go via cache
706 i = remap_instruction_operand_from_cache(which);
707 } else {
708 if (tag_at(which).has_bootstrap()) {
709 int pool_index = bootstrap_name_and_type_ref_index_at(which);
710 assert(tag_at(pool_index).is_name_and_type(), "");
711 return pool_index;
712 }
713 }
714 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
715 assert(!tag_at(i).has_bootstrap(), "Must be handled above");
716 jint ref_index = *int_at_addr(i);
717 return extract_high_short_from_int(ref_index);
718 }
719
720 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
721 int pool_index = which;
722 if (!uncached && cache() != NULL) {
723 if (ConstantPool::is_invokedynamic_index(which)) {
724 // Invokedynamic index is index into resolved_references
725 pool_index = invokedynamic_bootstrap_ref_index_at(which);
726 } else {
727 // change byte-ordering and go via cache
728 pool_index = remap_instruction_operand_from_cache(which);
729 }
730 }
731 return tag_at(pool_index);
732 }
733
734 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
735 guarantee(!ConstantPool::is_invokedynamic_index(which),
736 "an invokedynamic instruction does not have a klass");
737 int i = which;
738 if (!uncached && cache() != NULL) {
739 // change byte-ordering and go via cache
740 i = remap_instruction_operand_from_cache(which);
741 }
742 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
743 jint ref_index = *int_at_addr(i);
744 return extract_low_short_from_int(ref_index);
745 }
746
747
748
749 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
750 int cpc_index = operand;
751 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
752 assert((int)(u2)cpc_index == cpc_index, "clean u2");
753 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
754 return member_index;
755 }
756
757
758 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
759 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
760 return; // short cut, typeArray klass is always accessible
761 }
762 Klass* holder = this_cp->pool_holder();
763 LinkResolver::check_klass_accessibility(holder, k, CHECK);
764 }
765
766
767 int ConstantPool::name_ref_index_at(int which_nt) {
768 jint ref_index = name_and_type_at(which_nt);
769 return extract_low_short_from_int(ref_index);
770 }
771
772
773 int ConstantPool::signature_ref_index_at(int which_nt) {
774 jint ref_index = name_and_type_at(which_nt);
775 return extract_high_short_from_int(ref_index);
776 }
777
778
779 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
780 return klass_at(klass_ref_index_at(which), THREAD);
781 }
782
783 Symbol* ConstantPool::klass_name_at(int which) const {
784 return symbol_at(klass_slot_at(which).name_index());
785 }
786
787 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
788 jint ref_index = klass_ref_index_at(which);
789 return klass_at_noresolve(ref_index);
790 }
791
792 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
793 jint ref_index = uncached_klass_ref_index_at(which);
794 return klass_at_noresolve(ref_index);
795 }
796
797 char* ConstantPool::string_at_noresolve(int which) {
798 return unresolved_string_at(which)->as_C_string();
799 }
800
801 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
802 return Signature::basic_type(symbol_at(which));
803 }
804
805
806 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
807 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
808 if (this_cp->tag_at(index).is_string()) {
809 this_cp->string_at(index, CHECK);
810 }
811 }
812 }
813
814 static Symbol* exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
815 // Dig out the detailed message to reuse if possible
816 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
817 if (message != NULL) {
818 return message;
819 }
820
821 // Return specific message for the tag
822 switch (tag.value()) {
823 case JVM_CONSTANT_UnresolvedClass:
824 // return the class name in the error message
825 message = this_cp->klass_name_at(which);
826 break;
827 case JVM_CONSTANT_MethodHandle:
828 // return the method handle name in the error message
829 message = this_cp->method_handle_name_ref_at(which);
830 break;
831 case JVM_CONSTANT_MethodType:
832 // return the method type signature in the error message
833 message = this_cp->method_type_signature_at(which);
834 break;
835 case JVM_CONSTANT_Dynamic:
836 // return the name of the condy in the error message
837 message = this_cp->uncached_name_ref_at(which);
838 break;
839 default:
840 ShouldNotReachHere();
841 }
842
843 return message;
844 }
845
846 static void add_resolution_error(const constantPoolHandle& this_cp, int which,
847 constantTag tag, oop pending_exception) {
848
849 Symbol* error = pending_exception->klass()->name();
850 oop cause = java_lang_Throwable::cause(pending_exception);
851
852 // Also dig out the exception cause, if present.
853 Symbol* cause_sym = NULL;
854 Symbol* cause_msg = NULL;
855 if (cause != NULL && cause != pending_exception) {
856 cause_sym = cause->klass()->name();
857 cause_msg = java_lang_Throwable::detail_message(cause);
858 }
859
860 Symbol* message = exception_message(this_cp, which, tag, pending_exception);
861 SystemDictionary::add_resolution_error(this_cp, which, error, message, cause_sym, cause_msg);
862 }
863
864
865 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
866 ResourceMark rm(THREAD);
867 Symbol* message = NULL;
868 Symbol* cause = NULL;
869 Symbol* cause_msg = NULL;
870 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message, &cause, &cause_msg);
871 assert(error != NULL, "checking");
872 const char* cause_str = cause_msg != NULL ? cause_msg->as_C_string() : NULL;
873
874 CLEAR_PENDING_EXCEPTION;
875 if (message != NULL) {
876 char* msg = message->as_C_string();
877 if (cause != NULL) {
878 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_str);
879 THROW_MSG_CAUSE(error, msg, h_cause);
880 } else {
881 THROW_MSG(error, msg);
882 }
883 } else {
884 if (cause != NULL) {
885 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_str);
886 THROW_CAUSE(error, h_cause);
887 } else {
888 THROW(error);
889 }
890 }
891 }
892
893 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
894 // exception in the resolution error table, so that the same exception is thrown again.
895 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
896 constantTag tag, TRAPS) {
897
898 int error_tag = tag.error_value();
899
900 if (!PENDING_EXCEPTION->
901 is_a(vmClasses::LinkageError_klass())) {
902 // Just throw the exception and don't prevent these classes from
903 // being loaded due to virtual machine errors like StackOverflow
904 // and OutOfMemoryError, etc, or if the thread was hit by stop()
905 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
906 } else if (this_cp->tag_at(which).value() != error_tag) {
907 add_resolution_error(this_cp, which, tag, PENDING_EXCEPTION);
908 // CAS in the tag. If a thread beat us to registering this error that's fine.
909 // If another thread resolved the reference, this is a race condition. This
910 // thread may have had a security manager or something temporary.
911 // This doesn't deterministically get an error. So why do we save this?
912 // We save this because jvmti can add classes to the bootclass path after
913 // this error, so it needs to get the same error if the error is first.
914 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
915 (jbyte)tag.value(),
916 (jbyte)error_tag);
917 if (old_tag != error_tag && old_tag != tag.value()) {
918 // MethodHandles and MethodType doesn't change to resolved version.
919 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
920 // Forget the exception and use the resolved class.
921 CLEAR_PENDING_EXCEPTION;
922 }
923 } else {
924 // some other thread put this in error state
925 throw_resolution_error(this_cp, which, CHECK);
926 }
927 }
928
929 constantTag ConstantPool::constant_tag_at(int which) {
930 constantTag tag = tag_at(which);
931 if (tag.is_dynamic_constant()) {
932 BasicType bt = basic_type_for_constant_at(which);
933 return constantTag(constantTag::type2tag(bt));
934 }
935 return tag;
936 }
937
938 BasicType ConstantPool::basic_type_for_constant_at(int which) {
939 constantTag tag = tag_at(which);
940 if (tag.is_dynamic_constant() ||
941 tag.is_dynamic_constant_in_error()) {
942 // have to look at the signature for this one
943 Symbol* constant_type = uncached_signature_ref_at(which);
944 return Signature::basic_type(constant_type);
945 }
946 return tag.basic_type();
947 }
948
949 // Called to resolve constants in the constant pool and return an oop.
950 // Some constant pool entries cache their resolved oop. This is also
951 // called to create oops from constants to use in arguments for invokedynamic
952 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
953 int index, int cache_index,
954 bool* status_return, TRAPS) {
955 oop result_oop = NULL;
956 Handle throw_exception;
957
958 if (cache_index == _possible_index_sentinel) {
959 // It is possible that this constant is one which is cached in the objects.
960 // We'll do a linear search. This should be OK because this usage is rare.
961 // FIXME: If bootstrap specifiers stress this code, consider putting in
962 // a reverse index. Binary search over a short array should do it.
963 assert(index > 0, "valid index");
964 cache_index = this_cp->cp_to_object_index(index);
965 }
966 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
967 assert(index == _no_index_sentinel || index >= 0, "");
968
969 if (cache_index >= 0) {
970 result_oop = this_cp->resolved_references()->obj_at(cache_index);
971 if (result_oop != NULL) {
972 if (result_oop == Universe::the_null_sentinel()) {
973 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index)));
974 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
975 result_oop = NULL;
976 }
977 if (status_return != NULL) (*status_return) = true;
978 return result_oop;
979 // That was easy...
980 }
981 index = this_cp->object_to_cp_index(cache_index);
982 }
983
984 jvalue prim_value; // temp used only in a few cases below
985
986 constantTag tag = this_cp->tag_at(index);
987
988 if (status_return != NULL) {
989 // don't trigger resolution if the constant might need it
990 switch (tag.value()) {
991 case JVM_CONSTANT_Class:
992 {
993 CPKlassSlot kslot = this_cp->klass_slot_at(index);
994 int resolved_klass_index = kslot.resolved_klass_index();
995 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) {
996 (*status_return) = false;
997 return NULL;
998 }
999 // the klass is waiting in the CP; go get it
1000 break;
1001 }
1002 case JVM_CONSTANT_String:
1003 case JVM_CONSTANT_Integer:
1004 case JVM_CONSTANT_Float:
1005 case JVM_CONSTANT_Long:
1006 case JVM_CONSTANT_Double:
1007 // these guys trigger OOM at worst
1008 break;
1009 default:
1010 (*status_return) = false;
1011 return NULL;
1012 }
1013 // from now on there is either success or an OOME
1014 (*status_return) = true;
1015 }
1016
1017 switch (tag.value()) {
1018
1019 case JVM_CONSTANT_UnresolvedClass:
1020 case JVM_CONSTANT_Class:
1021 {
1022 assert(cache_index == _no_index_sentinel, "should not have been set");
1023 Klass* resolved = klass_at_impl(this_cp, index, CHECK_NULL);
1024 // ldc wants the java mirror.
1025 result_oop = tag.is_Qdescriptor_klass()
1026 ? InlineKlass::cast(resolved)->val_mirror()
1027 : resolved->java_mirror();
1028 break;
1029 }
1030
1031 case JVM_CONSTANT_Dynamic:
1032 {
1033 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
1034 BootstrapInfo bootstrap_specifier(this_cp, index);
1035
1036 // The initial step in resolving an unresolved symbolic reference to a
1037 // dynamically-computed constant is to resolve the symbolic reference to a
1038 // method handle which will be the bootstrap method for the dynamically-computed
1039 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
1040 // method fails, then a MethodHandleInError is stored at the corresponding
1041 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
1042 // set a DynamicConstantInError here since any subsequent use of this
1043 // bootstrap method will encounter the resolution of MethodHandleInError.
1044 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
1045 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
1046 // for the bootstrap_specifier created above.
1047 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1048 Exceptions::wrap_dynamic_exception(/* is_indy */ false, THREAD);
1049 if (HAS_PENDING_EXCEPTION) {
1050 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
1051 // will check for a LinkageError and store a DynamicConstantInError.
1052 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1053 }
1054 result_oop = bootstrap_specifier.resolved_value()();
1055 BasicType type = Signature::basic_type(bootstrap_specifier.signature());
1056 if (!is_reference_type(type)) {
1057 // Make sure the primitive value is properly boxed.
1058 // This is a JDK responsibility.
1059 const char* fail = NULL;
1060 if (result_oop == NULL) {
1061 fail = "null result instead of box";
1062 } else if (!is_java_primitive(type)) {
1063 // FIXME: support value types via unboxing
1064 fail = "can only handle references and primitives";
1065 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
1066 fail = "primitive is not properly boxed";
1067 }
1068 if (fail != NULL) {
1069 // Since this exception is not a LinkageError, throw exception
1070 // but do not save a DynamicInError resolution result.
1071 // See section 5.4.3 of the VM spec.
1072 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
1073 }
1074 }
1075
1076 LogTarget(Debug, methodhandles, condy) lt_condy;
1077 if (lt_condy.is_enabled()) {
1078 LogStream ls(lt_condy);
1079 bootstrap_specifier.print_msg_on(&ls, "resolve_constant_at_impl");
1080 }
1081 break;
1082 }
1083
1084 case JVM_CONSTANT_String:
1085 assert(cache_index != _no_index_sentinel, "should have been set");
1086 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
1087 break;
1088
1089 case JVM_CONSTANT_MethodHandle:
1090 {
1091 int ref_kind = this_cp->method_handle_ref_kind_at(index);
1092 int callee_index = this_cp->method_handle_klass_index_at(index);
1093 Symbol* name = this_cp->method_handle_name_ref_at(index);
1094 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
1095 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
1096 { ResourceMark rm(THREAD);
1097 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1098 ref_kind, index, this_cp->method_handle_index_at(index),
1099 callee_index, name->as_C_string(), signature->as_C_string());
1100 }
1101
1102 Klass* callee = klass_at_impl(this_cp, callee_index, THREAD);
1103 if (HAS_PENDING_EXCEPTION) {
1104 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1105 }
1106
1107 // Check constant pool method consistency
1108 if ((callee->is_interface() && m_tag.is_method()) ||
1109 (!callee->is_interface() && m_tag.is_interface_method())) {
1110 ResourceMark rm(THREAD);
1111 stringStream ss;
1112 ss.print("Inconsistent constant pool data in classfile for class %s. "
1113 "Method '", callee->name()->as_C_string());
1114 signature->print_as_signature_external_return_type(&ss);
1115 ss.print(" %s(", name->as_C_string());
1116 signature->print_as_signature_external_parameters(&ss);
1117 ss.print(")' at index %d is %s and should be %s",
1118 index,
1119 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1120 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1121 Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), "%s", ss.as_string());
1122 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1123 }
1124
1125 Klass* klass = this_cp->pool_holder();
1126 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1127 callee, name, signature,
1128 THREAD);
1129 if (HAS_PENDING_EXCEPTION) {
1130 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1131 }
1132 result_oop = value();
1133 break;
1134 }
1135
1136 case JVM_CONSTANT_MethodType:
1137 {
1138 Symbol* signature = this_cp->method_type_signature_at(index);
1139 { ResourceMark rm(THREAD);
1140 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1141 index, this_cp->method_type_index_at(index),
1142 signature->as_C_string());
1143 }
1144 Klass* klass = this_cp->pool_holder();
1145 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1146 result_oop = value();
1147 if (HAS_PENDING_EXCEPTION) {
1148 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1149 }
1150 break;
1151 }
1152
1153 case JVM_CONSTANT_Integer:
1154 assert(cache_index == _no_index_sentinel, "should not have been set");
1155 prim_value.i = this_cp->int_at(index);
1156 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1157 break;
1158
1159 case JVM_CONSTANT_Float:
1160 assert(cache_index == _no_index_sentinel, "should not have been set");
1161 prim_value.f = this_cp->float_at(index);
1162 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1163 break;
1164
1165 case JVM_CONSTANT_Long:
1166 assert(cache_index == _no_index_sentinel, "should not have been set");
1167 prim_value.j = this_cp->long_at(index);
1168 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1169 break;
1170
1171 case JVM_CONSTANT_Double:
1172 assert(cache_index == _no_index_sentinel, "should not have been set");
1173 prim_value.d = this_cp->double_at(index);
1174 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1175 break;
1176
1177 case JVM_CONSTANT_UnresolvedClassInError:
1178 case JVM_CONSTANT_DynamicInError:
1179 case JVM_CONSTANT_MethodHandleInError:
1180 case JVM_CONSTANT_MethodTypeInError:
1181 throw_resolution_error(this_cp, index, CHECK_NULL);
1182 break;
1183
1184 default:
1185 fatal("unexpected constant tag at CP %p[%d/%d] = %d", this_cp(), index, cache_index, tag.value());
1186 break;
1187 }
1188
1189 if (cache_index >= 0) {
1190 // Benign race condition: resolved_references may already be filled in.
1191 // The important thing here is that all threads pick up the same result.
1192 // It doesn't matter which racing thread wins, as long as only one
1193 // result is used by all threads, and all future queries.
1194 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop);
1195 oop old_result = this_cp->resolved_references()
1196 ->atomic_compare_exchange_oop(cache_index, new_result, NULL);
1197 if (old_result == NULL) {
1198 return result_oop; // was installed
1199 } else {
1200 // Return the winning thread's result. This can be different than
1201 // the result here for MethodHandles.
1202 if (old_result == Universe::the_null_sentinel())
1203 old_result = NULL;
1204 return old_result;
1205 }
1206 } else {
1207 assert(result_oop != Universe::the_null_sentinel(), "");
1208 return result_oop;
1209 }
1210 }
1211
1212 oop ConstantPool::uncached_string_at(int which, TRAPS) {
1213 Symbol* sym = unresolved_string_at(which);
1214 oop str = StringTable::intern(sym, CHECK_(NULL));
1215 assert(java_lang_String::is_instance(str), "must be string");
1216 return str;
1217 }
1218
1219 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index,
1220 int start_arg, int end_arg,
1221 objArrayHandle info, int pos,
1222 bool must_resolve, Handle if_not_available,
1223 TRAPS) {
1224 int limit = pos + end_arg - start_arg;
1225 // checks: index in range [0..this_cp->length),
1226 // tag at index, start..end in range [0..this_cp->bootstrap_argument_count],
1227 // info array non-null, pos..limit in [0..info.length]
1228 if ((0 >= index || index >= this_cp->length()) ||
1229 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1230 this_cp->tag_at(index).is_dynamic_constant()) ||
1231 (0 > start_arg || start_arg > end_arg) ||
1232 (end_arg > this_cp->bootstrap_argument_count_at(index)) ||
1233 (0 > pos || pos > limit) ||
1234 (info.is_null() || limit > info->length())) {
1235 // An index or something else went wrong; throw an error.
1236 // Since this is an internal API, we don't expect this,
1237 // so we don't bother to craft a nice message.
1238 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1239 }
1240 // now we can loop safely
1241 int info_i = pos;
1242 for (int i = start_arg; i < end_arg; i++) {
1243 int arg_index = this_cp->bootstrap_argument_index_at(index, i);
1244 oop arg_oop;
1245 if (must_resolve) {
1246 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1247 } else {
1248 bool found_it = false;
1249 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1250 if (!found_it) arg_oop = if_not_available();
1251 }
1252 info->obj_at_put(info_i++, arg_oop);
1253 }
1254 }
1255
1256 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1257 // If the string has already been interned, this entry will be non-null
1258 oop str = this_cp->resolved_references()->obj_at(obj_index);
1259 assert(str != Universe::the_null_sentinel(), "");
1260 if (str != NULL) return str;
1261 Symbol* sym = this_cp->unresolved_string_at(which);
1262 str = StringTable::intern(sym, CHECK_(NULL));
1263 this_cp->string_at_put(which, obj_index, str);
1264 assert(java_lang_String::is_instance(str), "must be string");
1265 return str;
1266 }
1267
1268
1269 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1270 // Names are interned, so we can compare Symbol*s directly
1271 Symbol* cp_name = klass_name_at(which);
1272 return (cp_name == k->name());
1273 }
1274
1275
1276 // Iterate over symbols and decrement ones which are Symbol*s
1277 // This is done during GC.
1278 // Only decrement the UTF8 symbols. Strings point to
1279 // these symbols but didn't increment the reference count.
1280 void ConstantPool::unreference_symbols() {
1281 for (int index = 1; index < length(); index++) { // Index 0 is unused
1282 constantTag tag = tag_at(index);
1283 if (tag.is_symbol()) {
1284 symbol_at(index)->decrement_refcount();
1285 }
1286 }
1287 }
1288
1289
1290 // Compare this constant pool's entry at index1 to the constant pool
1291 // cp2's entry at index2.
1292 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1293 int index2) {
1294
1295 // The error tags are equivalent to non-error tags when comparing
1296 jbyte t1 = tag_at(index1).non_error_value();
1297 jbyte t2 = cp2->tag_at(index2).non_error_value();
1298
1299 if (t1 != t2) {
1300 // Not the same entry type so there is nothing else to check. Note
1301 // that this style of checking will consider resolved/unresolved
1302 // class pairs as different.
1303 // From the ConstantPool* API point of view, this is correct
1304 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1305 // plays out in the context of ConstantPool* merging.
1306 return false;
1307 }
1308
1309 switch (t1) {
1310 case JVM_CONSTANT_Class:
1311 {
1312 Klass* k1 = resolved_klass_at(index1);
1313 Klass* k2 = cp2->resolved_klass_at(index2);
1314 if (k1 == k2) {
1315 return true;
1316 }
1317 } break;
1318
1319 case JVM_CONSTANT_ClassIndex:
1320 {
1321 int recur1 = klass_index_at(index1);
1322 int recur2 = cp2->klass_index_at(index2);
1323 if (compare_entry_to(recur1, cp2, recur2)) {
1324 return true;
1325 }
1326 } break;
1327
1328 case JVM_CONSTANT_Double:
1329 {
1330 jdouble d1 = double_at(index1);
1331 jdouble d2 = cp2->double_at(index2);
1332 if (d1 == d2) {
1333 return true;
1334 }
1335 } break;
1336
1337 case JVM_CONSTANT_Fieldref:
1338 case JVM_CONSTANT_InterfaceMethodref:
1339 case JVM_CONSTANT_Methodref:
1340 {
1341 int recur1 = uncached_klass_ref_index_at(index1);
1342 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1343 bool match = compare_entry_to(recur1, cp2, recur2);
1344 if (match) {
1345 recur1 = uncached_name_and_type_ref_index_at(index1);
1346 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1347 if (compare_entry_to(recur1, cp2, recur2)) {
1348 return true;
1349 }
1350 }
1351 } break;
1352
1353 case JVM_CONSTANT_Float:
1354 {
1355 jfloat f1 = float_at(index1);
1356 jfloat f2 = cp2->float_at(index2);
1357 if (f1 == f2) {
1358 return true;
1359 }
1360 } break;
1361
1362 case JVM_CONSTANT_Integer:
1363 {
1364 jint i1 = int_at(index1);
1365 jint i2 = cp2->int_at(index2);
1366 if (i1 == i2) {
1367 return true;
1368 }
1369 } break;
1370
1371 case JVM_CONSTANT_Long:
1372 {
1373 jlong l1 = long_at(index1);
1374 jlong l2 = cp2->long_at(index2);
1375 if (l1 == l2) {
1376 return true;
1377 }
1378 } break;
1379
1380 case JVM_CONSTANT_NameAndType:
1381 {
1382 int recur1 = name_ref_index_at(index1);
1383 int recur2 = cp2->name_ref_index_at(index2);
1384 if (compare_entry_to(recur1, cp2, recur2)) {
1385 recur1 = signature_ref_index_at(index1);
1386 recur2 = cp2->signature_ref_index_at(index2);
1387 if (compare_entry_to(recur1, cp2, recur2)) {
1388 return true;
1389 }
1390 }
1391 } break;
1392
1393 case JVM_CONSTANT_StringIndex:
1394 {
1395 int recur1 = string_index_at(index1);
1396 int recur2 = cp2->string_index_at(index2);
1397 if (compare_entry_to(recur1, cp2, recur2)) {
1398 return true;
1399 }
1400 } break;
1401
1402 case JVM_CONSTANT_UnresolvedClass:
1403 {
1404 Symbol* k1 = klass_name_at(index1);
1405 Symbol* k2 = cp2->klass_name_at(index2);
1406 if (k1 == k2) {
1407 return true;
1408 }
1409 } break;
1410
1411 case JVM_CONSTANT_MethodType:
1412 {
1413 int k1 = method_type_index_at(index1);
1414 int k2 = cp2->method_type_index_at(index2);
1415 if (compare_entry_to(k1, cp2, k2)) {
1416 return true;
1417 }
1418 } break;
1419
1420 case JVM_CONSTANT_MethodHandle:
1421 {
1422 int k1 = method_handle_ref_kind_at(index1);
1423 int k2 = cp2->method_handle_ref_kind_at(index2);
1424 if (k1 == k2) {
1425 int i1 = method_handle_index_at(index1);
1426 int i2 = cp2->method_handle_index_at(index2);
1427 if (compare_entry_to(i1, cp2, i2)) {
1428 return true;
1429 }
1430 }
1431 } break;
1432
1433 case JVM_CONSTANT_Dynamic:
1434 {
1435 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1436 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1437 int i1 = bootstrap_methods_attribute_index(index1);
1438 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1439 bool match_entry = compare_entry_to(k1, cp2, k2);
1440 bool match_operand = compare_operand_to(i1, cp2, i2);
1441 return (match_entry && match_operand);
1442 } break;
1443
1444 case JVM_CONSTANT_InvokeDynamic:
1445 {
1446 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1447 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1448 int i1 = bootstrap_methods_attribute_index(index1);
1449 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1450 bool match_entry = compare_entry_to(k1, cp2, k2);
1451 bool match_operand = compare_operand_to(i1, cp2, i2);
1452 return (match_entry && match_operand);
1453 } break;
1454
1455 case JVM_CONSTANT_String:
1456 {
1457 Symbol* s1 = unresolved_string_at(index1);
1458 Symbol* s2 = cp2->unresolved_string_at(index2);
1459 if (s1 == s2) {
1460 return true;
1461 }
1462 } break;
1463
1464 case JVM_CONSTANT_Utf8:
1465 {
1466 Symbol* s1 = symbol_at(index1);
1467 Symbol* s2 = cp2->symbol_at(index2);
1468 if (s1 == s2) {
1469 return true;
1470 }
1471 } break;
1472
1473 // Invalid is used as the tag for the second constant pool entry
1474 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1475 // not be seen by itself.
1476 case JVM_CONSTANT_Invalid: // fall through
1477
1478 default:
1479 ShouldNotReachHere();
1480 break;
1481 }
1482
1483 return false;
1484 } // end compare_entry_to()
1485
1486
1487 // Resize the operands array with delta_len and delta_size.
1488 // Used in RedefineClasses for CP merge.
1489 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1490 int old_len = operand_array_length(operands());
1491 int new_len = old_len + delta_len;
1492 int min_len = (delta_len > 0) ? old_len : new_len;
1493
1494 int old_size = operands()->length();
1495 int new_size = old_size + delta_size;
1496 int min_size = (delta_size > 0) ? old_size : new_size;
1497
1498 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1499 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1500
1501 // Set index in the resized array for existing elements only
1502 for (int idx = 0; idx < min_len; idx++) {
1503 int offset = operand_offset_at(idx); // offset in original array
1504 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1505 }
1506 // Copy the bootstrap specifiers only
1507 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1508 new_ops->adr_at(2*new_len),
1509 (min_size - 2*min_len) * sizeof(u2));
1510 // Explicitly deallocate old operands array.
1511 // Note, it is not needed for 7u backport.
1512 if ( operands() != NULL) { // the safety check
1513 MetadataFactory::free_array<u2>(loader_data, operands());
1514 }
1515 set_operands(new_ops);
1516 } // end resize_operands()
1517
1518
1519 // Extend the operands array with the length and size of the ext_cp operands.
1520 // Used in RedefineClasses for CP merge.
1521 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1522 int delta_len = operand_array_length(ext_cp->operands());
1523 if (delta_len == 0) {
1524 return; // nothing to do
1525 }
1526 int delta_size = ext_cp->operands()->length();
1527
1528 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1529
1530 if (operand_array_length(operands()) == 0) {
1531 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1532 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1533 // The first element index defines the offset of second part
1534 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1535 set_operands(new_ops);
1536 } else {
1537 resize_operands(delta_len, delta_size, CHECK);
1538 }
1539
1540 } // end extend_operands()
1541
1542
1543 // Shrink the operands array to a smaller array with new_len length.
1544 // Used in RedefineClasses for CP merge.
1545 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1546 int old_len = operand_array_length(operands());
1547 if (new_len == old_len) {
1548 return; // nothing to do
1549 }
1550 assert(new_len < old_len, "shrunken operands array must be smaller");
1551
1552 int free_base = operand_next_offset_at(new_len - 1);
1553 int delta_len = new_len - old_len;
1554 int delta_size = 2*delta_len + free_base - operands()->length();
1555
1556 resize_operands(delta_len, delta_size, CHECK);
1557
1558 } // end shrink_operands()
1559
1560
1561 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1562 const constantPoolHandle& to_cp,
1563 TRAPS) {
1564
1565 int from_oplen = operand_array_length(from_cp->operands());
1566 int old_oplen = operand_array_length(to_cp->operands());
1567 if (from_oplen != 0) {
1568 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1569 // append my operands to the target's operands array
1570 if (old_oplen == 0) {
1571 // Can't just reuse from_cp's operand list because of deallocation issues
1572 int len = from_cp->operands()->length();
1573 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1574 Copy::conjoint_memory_atomic(
1575 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1576 to_cp->set_operands(new_ops);
1577 } else {
1578 int old_len = to_cp->operands()->length();
1579 int from_len = from_cp->operands()->length();
1580 int old_off = old_oplen * sizeof(u2);
1581 int from_off = from_oplen * sizeof(u2);
1582 // Use the metaspace for the destination constant pool
1583 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1584 int fillp = 0, len = 0;
1585 // first part of dest
1586 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1587 new_operands->adr_at(fillp),
1588 (len = old_off) * sizeof(u2));
1589 fillp += len;
1590 // first part of src
1591 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1592 new_operands->adr_at(fillp),
1593 (len = from_off) * sizeof(u2));
1594 fillp += len;
1595 // second part of dest
1596 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1597 new_operands->adr_at(fillp),
1598 (len = old_len - old_off) * sizeof(u2));
1599 fillp += len;
1600 // second part of src
1601 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1602 new_operands->adr_at(fillp),
1603 (len = from_len - from_off) * sizeof(u2));
1604 fillp += len;
1605 assert(fillp == new_operands->length(), "");
1606
1607 // Adjust indexes in the first part of the copied operands array.
1608 for (int j = 0; j < from_oplen; j++) {
1609 int offset = operand_offset_at(new_operands, old_oplen + j);
1610 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1611 offset += old_len; // every new tuple is preceded by old_len extra u2's
1612 operand_offset_at_put(new_operands, old_oplen + j, offset);
1613 }
1614
1615 // replace target operands array with combined array
1616 to_cp->set_operands(new_operands);
1617 }
1618 }
1619 } // end copy_operands()
1620
1621
1622 // Copy this constant pool's entries at start_i to end_i (inclusive)
1623 // to the constant pool to_cp's entries starting at to_i. A total of
1624 // (end_i - start_i) + 1 entries are copied.
1625 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1626 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1627
1628
1629 int dest_i = to_i; // leave original alone for debug purposes
1630
1631 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1632 copy_entry_to(from_cp, src_i, to_cp, dest_i);
1633
1634 switch (from_cp->tag_at(src_i).value()) {
1635 case JVM_CONSTANT_Double:
1636 case JVM_CONSTANT_Long:
1637 // double and long take two constant pool entries
1638 src_i += 2;
1639 dest_i += 2;
1640 break;
1641
1642 default:
1643 // all others take one constant pool entry
1644 src_i++;
1645 dest_i++;
1646 break;
1647 }
1648 }
1649 copy_operands(from_cp, to_cp, CHECK);
1650
1651 } // end copy_cp_to_impl()
1652
1653
1654 // Copy this constant pool's entry at from_i to the constant pool
1655 // to_cp's entry at to_i.
1656 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1657 const constantPoolHandle& to_cp, int to_i) {
1658
1659 int tag = from_cp->tag_at(from_i).value();
1660 switch (tag) {
1661 case JVM_CONSTANT_ClassIndex:
1662 {
1663 jint ki = from_cp->klass_index_at(from_i);
1664 to_cp->klass_index_at_put(to_i, ki);
1665 } break;
1666
1667 case JVM_CONSTANT_Double:
1668 {
1669 jdouble d = from_cp->double_at(from_i);
1670 to_cp->double_at_put(to_i, d);
1671 // double takes two constant pool entries so init second entry's tag
1672 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1673 } break;
1674
1675 case JVM_CONSTANT_Fieldref:
1676 {
1677 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1678 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1679 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1680 } break;
1681
1682 case JVM_CONSTANT_Float:
1683 {
1684 jfloat f = from_cp->float_at(from_i);
1685 to_cp->float_at_put(to_i, f);
1686 } break;
1687
1688 case JVM_CONSTANT_Integer:
1689 {
1690 jint i = from_cp->int_at(from_i);
1691 to_cp->int_at_put(to_i, i);
1692 } break;
1693
1694 case JVM_CONSTANT_InterfaceMethodref:
1695 {
1696 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1697 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1698 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1699 } break;
1700
1701 case JVM_CONSTANT_Long:
1702 {
1703 jlong l = from_cp->long_at(from_i);
1704 to_cp->long_at_put(to_i, l);
1705 // long takes two constant pool entries so init second entry's tag
1706 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1707 } break;
1708
1709 case JVM_CONSTANT_Methodref:
1710 {
1711 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1712 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1713 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1714 } break;
1715
1716 case JVM_CONSTANT_NameAndType:
1717 {
1718 int name_ref_index = from_cp->name_ref_index_at(from_i);
1719 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1720 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1721 } break;
1722
1723 case JVM_CONSTANT_StringIndex:
1724 {
1725 jint si = from_cp->string_index_at(from_i);
1726 to_cp->string_index_at_put(to_i, si);
1727 } break;
1728
1729 case JVM_CONSTANT_Class:
1730 case JVM_CONSTANT_UnresolvedClass:
1731 case JVM_CONSTANT_UnresolvedClassInError:
1732 {
1733 // Revert to JVM_CONSTANT_ClassIndex
1734 int name_index = from_cp->klass_slot_at(from_i).name_index();
1735 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1736 to_cp->klass_index_at_put(to_i, name_index);
1737 } break;
1738
1739 case JVM_CONSTANT_String:
1740 {
1741 Symbol* s = from_cp->unresolved_string_at(from_i);
1742 to_cp->unresolved_string_at_put(to_i, s);
1743 } break;
1744
1745 case JVM_CONSTANT_Utf8:
1746 {
1747 Symbol* s = from_cp->symbol_at(from_i);
1748 // Need to increase refcount, the old one will be thrown away and deferenced
1749 s->increment_refcount();
1750 to_cp->symbol_at_put(to_i, s);
1751 } break;
1752
1753 case JVM_CONSTANT_MethodType:
1754 case JVM_CONSTANT_MethodTypeInError:
1755 {
1756 jint k = from_cp->method_type_index_at(from_i);
1757 to_cp->method_type_index_at_put(to_i, k);
1758 } break;
1759
1760 case JVM_CONSTANT_MethodHandle:
1761 case JVM_CONSTANT_MethodHandleInError:
1762 {
1763 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1764 int k2 = from_cp->method_handle_index_at(from_i);
1765 to_cp->method_handle_index_at_put(to_i, k1, k2);
1766 } break;
1767
1768 case JVM_CONSTANT_Dynamic:
1769 case JVM_CONSTANT_DynamicInError:
1770 {
1771 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1772 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1773 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1774 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1775 } break;
1776
1777 case JVM_CONSTANT_InvokeDynamic:
1778 {
1779 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1780 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1781 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1782 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1783 } break;
1784
1785 // Invalid is used as the tag for the second constant pool entry
1786 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1787 // not be seen by itself.
1788 case JVM_CONSTANT_Invalid: // fall through
1789
1790 default:
1791 {
1792 ShouldNotReachHere();
1793 } break;
1794 }
1795 } // end copy_entry_to()
1796
1797 // Search constant pool search_cp for an entry that matches this
1798 // constant pool's entry at pattern_i. Returns the index of a
1799 // matching entry or zero (0) if there is no matching entry.
1800 int ConstantPool::find_matching_entry(int pattern_i,
1801 const constantPoolHandle& search_cp) {
1802
1803 // index zero (0) is not used
1804 for (int i = 1; i < search_cp->length(); i++) {
1805 bool found = compare_entry_to(pattern_i, search_cp, i);
1806 if (found) {
1807 return i;
1808 }
1809 }
1810
1811 return 0; // entry not found; return unused index zero (0)
1812 } // end find_matching_entry()
1813
1814
1815 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1816 // cp2's bootstrap specifier at idx2.
1817 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2) {
1818 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1819 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1820 bool match = compare_entry_to(k1, cp2, k2);
1821
1822 if (!match) {
1823 return false;
1824 }
1825 int argc = operand_argument_count_at(idx1);
1826 if (argc == cp2->operand_argument_count_at(idx2)) {
1827 for (int j = 0; j < argc; j++) {
1828 k1 = operand_argument_index_at(idx1, j);
1829 k2 = cp2->operand_argument_index_at(idx2, j);
1830 match = compare_entry_to(k1, cp2, k2);
1831 if (!match) {
1832 return false;
1833 }
1834 }
1835 return true; // got through loop; all elements equal
1836 }
1837 return false;
1838 } // end compare_operand_to()
1839
1840 // Search constant pool search_cp for a bootstrap specifier that matches
1841 // this constant pool's bootstrap specifier data at pattern_i index.
1842 // Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1843 int ConstantPool::find_matching_operand(int pattern_i,
1844 const constantPoolHandle& search_cp, int search_len) {
1845 for (int i = 0; i < search_len; i++) {
1846 bool found = compare_operand_to(pattern_i, search_cp, i);
1847 if (found) {
1848 return i;
1849 }
1850 }
1851 return -1; // bootstrap specifier data not found; return unused index (-1)
1852 } // end find_matching_operand()
1853
1854
1855 #ifndef PRODUCT
1856
1857 const char* ConstantPool::printable_name_at(int which) {
1858
1859 constantTag tag = tag_at(which);
1860
1861 if (tag.is_string()) {
1862 return string_at_noresolve(which);
1863 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1864 return klass_name_at(which)->as_C_string();
1865 } else if (tag.is_symbol()) {
1866 return symbol_at(which)->as_C_string();
1867 }
1868 return "";
1869 }
1870
1871 #endif // PRODUCT
1872
1873
1874 // JVMTI GetConstantPool support
1875
1876 // For debugging of constant pool
1877 const bool debug_cpool = false;
1878
1879 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1880
1881 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1882 const char* WARN_MSG = "Must not be such entry!";
1883 jint size = 0;
1884 u2 idx1, idx2;
1885
1886 for (jint idx = 1; idx < cnt; idx++) {
1887 jint ent_size = 0;
1888 u1 tag = *bytes++;
1889 size++; // count tag
1890
1891 printf("const #%03d, tag: %02d ", idx, tag);
1892 switch(tag) {
1893 case JVM_CONSTANT_Invalid: {
1894 printf("Invalid");
1895 break;
1896 }
1897 case JVM_CONSTANT_Unicode: {
1898 printf("Unicode %s", WARN_MSG);
1899 break;
1900 }
1901 case JVM_CONSTANT_Utf8: {
1902 u2 len = Bytes::get_Java_u2(bytes);
1903 char str[128];
1904 if (len > 127) {
1905 len = 127;
1906 }
1907 strncpy(str, (char *) (bytes+2), len);
1908 str[len] = '\0';
1909 printf("Utf8 \"%s\"", str);
1910 ent_size = 2 + len;
1911 break;
1912 }
1913 case JVM_CONSTANT_Integer: {
1914 u4 val = Bytes::get_Java_u4(bytes);
1915 printf("int %d", *(int *) &val);
1916 ent_size = 4;
1917 break;
1918 }
1919 case JVM_CONSTANT_Float: {
1920 u4 val = Bytes::get_Java_u4(bytes);
1921 printf("float %5.3ff", *(float *) &val);
1922 ent_size = 4;
1923 break;
1924 }
1925 case JVM_CONSTANT_Long: {
1926 u8 val = Bytes::get_Java_u8(bytes);
1927 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1928 ent_size = 8;
1929 idx++; // Long takes two cpool slots
1930 break;
1931 }
1932 case JVM_CONSTANT_Double: {
1933 u8 val = Bytes::get_Java_u8(bytes);
1934 printf("double %5.3fd", *(jdouble *)&val);
1935 ent_size = 8;
1936 idx++; // Double takes two cpool slots
1937 break;
1938 }
1939 case JVM_CONSTANT_Class: {
1940 idx1 = Bytes::get_Java_u2(bytes);
1941 printf("class #%03d", idx1);
1942 ent_size = 2;
1943 break;
1944 }
1945 case (JVM_CONSTANT_Class | JVM_CONSTANT_QDescBit): {
1946 idx1 = Bytes::get_Java_u2(bytes);
1947 printf("qclass #%03d", idx1);
1948 ent_size = 2;
1949 break;
1950 }
1951 case JVM_CONSTANT_String: {
1952 idx1 = Bytes::get_Java_u2(bytes);
1953 printf("String #%03d", idx1);
1954 ent_size = 2;
1955 break;
1956 }
1957 case JVM_CONSTANT_Fieldref: {
1958 idx1 = Bytes::get_Java_u2(bytes);
1959 idx2 = Bytes::get_Java_u2(bytes+2);
1960 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1961 ent_size = 4;
1962 break;
1963 }
1964 case JVM_CONSTANT_Methodref: {
1965 idx1 = Bytes::get_Java_u2(bytes);
1966 idx2 = Bytes::get_Java_u2(bytes+2);
1967 printf("Method #%03d, #%03d", idx1, idx2);
1968 ent_size = 4;
1969 break;
1970 }
1971 case JVM_CONSTANT_InterfaceMethodref: {
1972 idx1 = Bytes::get_Java_u2(bytes);
1973 idx2 = Bytes::get_Java_u2(bytes+2);
1974 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1975 ent_size = 4;
1976 break;
1977 }
1978 case JVM_CONSTANT_NameAndType: {
1979 idx1 = Bytes::get_Java_u2(bytes);
1980 idx2 = Bytes::get_Java_u2(bytes+2);
1981 printf("NameAndType #%03d, #%03d", idx1, idx2);
1982 ent_size = 4;
1983 break;
1984 }
1985 case JVM_CONSTANT_ClassIndex: {
1986 printf("ClassIndex %s", WARN_MSG);
1987 break;
1988 }
1989 case JVM_CONSTANT_UnresolvedClass: {
1990 printf("UnresolvedClass: %s", WARN_MSG);
1991 break;
1992 }
1993 case (JVM_CONSTANT_UnresolvedClass | JVM_CONSTANT_QDescBit): {
1994 printf("UnresolvedQClass: %s", WARN_MSG);
1995 break;
1996 }
1997 case JVM_CONSTANT_UnresolvedClassInError: {
1998 printf("UnresolvedClassInErr: %s", WARN_MSG);
1999 break;
2000 }
2001 case JVM_CONSTANT_StringIndex: {
2002 printf("StringIndex: %s", WARN_MSG);
2003 break;
2004 }
2005 }
2006 printf(";\n");
2007 bytes += ent_size;
2008 size += ent_size;
2009 }
2010 printf("Cpool size: %d\n", size);
2011 fflush(0);
2012 return;
2013 } /* end print_cpool_bytes */
2014
2015
2016 // Returns size of constant pool entry.
2017 jint ConstantPool::cpool_entry_size(jint idx) {
2018 switch(tag_at(idx).value()) {
2019 case JVM_CONSTANT_Invalid:
2020 case JVM_CONSTANT_Unicode:
2021 return 1;
2022
2023 case JVM_CONSTANT_Utf8:
2024 return 3 + symbol_at(idx)->utf8_length();
2025
2026 case JVM_CONSTANT_Class:
2027 case JVM_CONSTANT_String:
2028 case JVM_CONSTANT_ClassIndex:
2029 case JVM_CONSTANT_UnresolvedClass:
2030 case JVM_CONSTANT_UnresolvedClassInError:
2031 case JVM_CONSTANT_StringIndex:
2032 case JVM_CONSTANT_MethodType:
2033 case JVM_CONSTANT_MethodTypeInError:
2034 return 3;
2035
2036 case JVM_CONSTANT_MethodHandle:
2037 case JVM_CONSTANT_MethodHandleInError:
2038 return 4; //tag, ref_kind, ref_index
2039
2040 case JVM_CONSTANT_Integer:
2041 case JVM_CONSTANT_Float:
2042 case JVM_CONSTANT_Fieldref:
2043 case JVM_CONSTANT_Methodref:
2044 case JVM_CONSTANT_InterfaceMethodref:
2045 case JVM_CONSTANT_NameAndType:
2046 return 5;
2047
2048 case JVM_CONSTANT_Dynamic:
2049 case JVM_CONSTANT_DynamicInError:
2050 case JVM_CONSTANT_InvokeDynamic:
2051 // u1 tag, u2 bsm, u2 nt
2052 return 5;
2053
2054 case JVM_CONSTANT_Long:
2055 case JVM_CONSTANT_Double:
2056 return 9;
2057 }
2058 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
2059 return 1;
2060 } /* end cpool_entry_size */
2061
2062
2063 // SymbolHash is used to find a constant pool index from a string.
2064 // This function fills in SymbolHashs, one for utf8s and one for
2065 // class names, returns size of the cpool raw bytes.
2066 jint ConstantPool::hash_entries_to(SymbolHash *symmap,
2067 SymbolHash *classmap) {
2068 jint size = 0;
2069
2070 for (u2 idx = 1; idx < length(); idx++) {
2071 u2 tag = tag_at(idx).value();
2072 size += cpool_entry_size(idx);
2073
2074 switch(tag) {
2075 case JVM_CONSTANT_Utf8: {
2076 Symbol* sym = symbol_at(idx);
2077 symmap->add_if_absent(sym, idx);
2078 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
2079 break;
2080 }
2081 case JVM_CONSTANT_Class:
2082 case JVM_CONSTANT_UnresolvedClass:
2083 case JVM_CONSTANT_UnresolvedClassInError: {
2084 Symbol* sym = klass_name_at(idx);
2085 classmap->add_if_absent(sym, idx);
2086 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
2087 break;
2088 }
2089 case JVM_CONSTANT_Long:
2090 case JVM_CONSTANT_Double: {
2091 idx++; // Both Long and Double take two cpool slots
2092 break;
2093 }
2094 }
2095 }
2096 return size;
2097 } /* end hash_utf8_entries_to */
2098
2099
2100 // Copy cpool bytes.
2101 // Returns:
2102 // 0, in case of OutOfMemoryError
2103 // -1, in case of internal error
2104 // > 0, count of the raw cpool bytes that have been copied
2105 int ConstantPool::copy_cpool_bytes(int cpool_size,
2106 SymbolHash* tbl,
2107 unsigned char *bytes) {
2108 u2 idx1, idx2;
2109 jint size = 0;
2110 jint cnt = length();
2111 unsigned char *start_bytes = bytes;
2112
2113 for (jint idx = 1; idx < cnt; idx++) {
2114 u1 tag = tag_at(idx).value();
2115 jint ent_size = cpool_entry_size(idx);
2116
2117 assert(size + ent_size <= cpool_size, "Size mismatch");
2118
2119 *bytes = tag;
2120 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2121 switch(tag) {
2122 case JVM_CONSTANT_Invalid: {
2123 DBG(printf("JVM_CONSTANT_Invalid"));
2124 break;
2125 }
2126 case JVM_CONSTANT_Unicode: {
2127 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2128 DBG(printf("JVM_CONSTANT_Unicode"));
2129 break;
2130 }
2131 case JVM_CONSTANT_Utf8: {
2132 Symbol* sym = symbol_at(idx);
2133 char* str = sym->as_utf8();
2134 // Warning! It's crashing on x86 with len = sym->utf8_length()
2135 int len = (int) strlen(str);
2136 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2137 for (int i = 0; i < len; i++) {
2138 bytes[3+i] = (u1) str[i];
2139 }
2140 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2141 break;
2142 }
2143 case JVM_CONSTANT_Integer: {
2144 jint val = int_at(idx);
2145 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2146 break;
2147 }
2148 case JVM_CONSTANT_Float: {
2149 jfloat val = float_at(idx);
2150 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2151 break;
2152 }
2153 case JVM_CONSTANT_Long: {
2154 jlong val = long_at(idx);
2155 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2156 idx++; // Long takes two cpool slots
2157 break;
2158 }
2159 case JVM_CONSTANT_Double: {
2160 jdouble val = double_at(idx);
2161 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2162 idx++; // Double takes two cpool slots
2163 break;
2164 }
2165 case JVM_CONSTANT_Class:
2166 case JVM_CONSTANT_UnresolvedClass:
2167 case JVM_CONSTANT_UnresolvedClassInError: {
2168 *bytes = JVM_CONSTANT_Class;
2169 Symbol* sym = klass_name_at(idx);
2170 idx1 = tbl->symbol_to_value(sym);
2171 assert(idx1 != 0, "Have not found a hashtable entry");
2172 Bytes::put_Java_u2((address) (bytes+1), idx1);
2173 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2174 break;
2175 }
2176 case JVM_CONSTANT_String: {
2177 *bytes = JVM_CONSTANT_String;
2178 Symbol* sym = unresolved_string_at(idx);
2179 idx1 = tbl->symbol_to_value(sym);
2180 assert(idx1 != 0, "Have not found a hashtable entry");
2181 Bytes::put_Java_u2((address) (bytes+1), idx1);
2182 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2183 break;
2184 }
2185 case JVM_CONSTANT_Fieldref:
2186 case JVM_CONSTANT_Methodref:
2187 case JVM_CONSTANT_InterfaceMethodref: {
2188 idx1 = uncached_klass_ref_index_at(idx);
2189 idx2 = uncached_name_and_type_ref_index_at(idx);
2190 Bytes::put_Java_u2((address) (bytes+1), idx1);
2191 Bytes::put_Java_u2((address) (bytes+3), idx2);
2192 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2193 break;
2194 }
2195 case JVM_CONSTANT_NameAndType: {
2196 idx1 = name_ref_index_at(idx);
2197 idx2 = signature_ref_index_at(idx);
2198 Bytes::put_Java_u2((address) (bytes+1), idx1);
2199 Bytes::put_Java_u2((address) (bytes+3), idx2);
2200 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2201 break;
2202 }
2203 case JVM_CONSTANT_ClassIndex: {
2204 *bytes = JVM_CONSTANT_Class;
2205 idx1 = klass_index_at(idx);
2206 Bytes::put_Java_u2((address) (bytes+1), idx1);
2207 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2208 break;
2209 }
2210 case JVM_CONSTANT_StringIndex: {
2211 *bytes = JVM_CONSTANT_String;
2212 idx1 = string_index_at(idx);
2213 Bytes::put_Java_u2((address) (bytes+1), idx1);
2214 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2215 break;
2216 }
2217 case JVM_CONSTANT_MethodHandle:
2218 case JVM_CONSTANT_MethodHandleInError: {
2219 *bytes = JVM_CONSTANT_MethodHandle;
2220 int kind = method_handle_ref_kind_at(idx);
2221 idx1 = method_handle_index_at(idx);
2222 *(bytes+1) = (unsigned char) kind;
2223 Bytes::put_Java_u2((address) (bytes+2), idx1);
2224 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2225 break;
2226 }
2227 case JVM_CONSTANT_MethodType:
2228 case JVM_CONSTANT_MethodTypeInError: {
2229 *bytes = JVM_CONSTANT_MethodType;
2230 idx1 = method_type_index_at(idx);
2231 Bytes::put_Java_u2((address) (bytes+1), idx1);
2232 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2233 break;
2234 }
2235 case JVM_CONSTANT_Dynamic:
2236 case JVM_CONSTANT_DynamicInError: {
2237 *bytes = tag;
2238 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2239 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2240 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2241 Bytes::put_Java_u2((address) (bytes+1), idx1);
2242 Bytes::put_Java_u2((address) (bytes+3), idx2);
2243 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2244 break;
2245 }
2246 case JVM_CONSTANT_InvokeDynamic: {
2247 *bytes = tag;
2248 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2249 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2250 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2251 Bytes::put_Java_u2((address) (bytes+1), idx1);
2252 Bytes::put_Java_u2((address) (bytes+3), idx2);
2253 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2254 break;
2255 }
2256 }
2257 DBG(printf("\n"));
2258 bytes += ent_size;
2259 size += ent_size;
2260 }
2261 assert(size == cpool_size, "Size mismatch");
2262
2263 // Keep temporarily for debugging until it's stable.
2264 DBG(print_cpool_bytes(cnt, start_bytes));
2265 return (int)(bytes - start_bytes);
2266 } /* end copy_cpool_bytes */
2267
2268 #undef DBG
2269
2270 bool ConstantPool::is_maybe_on_stack() const {
2271 // This method uses the similar logic as nmethod::is_maybe_on_stack()
2272 if (!Continuations::enabled()) {
2273 return false;
2274 }
2275
2276 // If the condition below is true, it means that the nmethod was found to
2277 // be alive the previous completed marking cycle.
2278 return cache()->gc_epoch() >= CodeCache::previous_completed_gc_marking_cycle();
2279 }
2280
2281 // For redefinition, if any methods found in loom stack chunks, the gc_epoch is
2282 // recorded in their constant pool cache. The on_stack-ness of the constant pool controls whether
2283 // memory for the method is reclaimed.
2284 bool ConstantPool::on_stack() const {
2285 if ((_flags &_on_stack) != 0) {
2286 return true;
2287 }
2288
2289 if (_cache == nullptr) {
2290 return false;
2291 }
2292
2293 return is_maybe_on_stack();
2294 }
2295
2296 void ConstantPool::set_on_stack(const bool value) {
2297 if (value) {
2298 // Only record if it's not already set.
2299 if (!on_stack()) {
2300 assert(!is_shared(), "should always be set for shared constant pools");
2301 _flags |= _on_stack;
2302 MetadataOnStackMark::record(this);
2303 }
2304 } else {
2305 // Clearing is done single-threadedly.
2306 if (!is_shared()) {
2307 _flags &= ~_on_stack;
2308 }
2309 }
2310 }
2311
2312 // Printing
2313
2314 void ConstantPool::print_on(outputStream* st) const {
2315 assert(is_constantPool(), "must be constantPool");
2316 st->print_cr("%s", internal_name());
2317 if (flags() != 0) {
2318 st->print(" - flags: 0x%x", flags());
2319 if (has_preresolution()) st->print(" has_preresolution");
2320 if (on_stack()) st->print(" on_stack");
2321 st->cr();
2322 }
2323 if (pool_holder() != NULL) {
2324 st->print_cr(" - holder: " PTR_FORMAT, p2i(pool_holder()));
2325 }
2326 st->print_cr(" - cache: " PTR_FORMAT, p2i(cache()));
2327 st->print_cr(" - resolved_references: " PTR_FORMAT, p2i(resolved_references_or_null()));
2328 st->print_cr(" - reference_map: " PTR_FORMAT, p2i(reference_map()));
2329 st->print_cr(" - resolved_klasses: " PTR_FORMAT, p2i(resolved_klasses()));
2330 st->print_cr(" - cp length: %d", length());
2331
2332 for (int index = 1; index < length(); index++) { // Index 0 is unused
2333 ((ConstantPool*)this)->print_entry_on(index, st);
2334 switch (tag_at(index).value()) {
2335 case JVM_CONSTANT_Long :
2336 case JVM_CONSTANT_Double :
2337 index++; // Skip entry following eigth-byte constant
2338 }
2339
2340 }
2341 st->cr();
2342 }
2343
2344 // Print one constant pool entry
2345 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2346 EXCEPTION_MARK;
2347 st->print(" - %3d : ", index);
2348 tag_at(index).print_on(st);
2349 st->print(" : ");
2350 switch (tag_at(index).value()) {
2351 case JVM_CONSTANT_Class :
2352 { Klass* k = klass_at(index, CATCH);
2353 guarantee(k != NULL, "need klass");
2354 k->print_value_on(st);
2355 st->print(" {" PTR_FORMAT "}", p2i(k));
2356 }
2357 break;
2358 case JVM_CONSTANT_Fieldref :
2359 case JVM_CONSTANT_Methodref :
2360 case JVM_CONSTANT_InterfaceMethodref :
2361 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2362 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2363 break;
2364 case JVM_CONSTANT_String :
2365 unresolved_string_at(index)->print_value_on(st);
2366 break;
2367 case JVM_CONSTANT_Integer :
2368 st->print("%d", int_at(index));
2369 break;
2370 case JVM_CONSTANT_Float :
2371 st->print("%f", float_at(index));
2372 break;
2373 case JVM_CONSTANT_Long :
2374 st->print_jlong(long_at(index));
2375 break;
2376 case JVM_CONSTANT_Double :
2377 st->print("%lf", double_at(index));
2378 break;
2379 case JVM_CONSTANT_NameAndType :
2380 st->print("name_index=%d", name_ref_index_at(index));
2381 st->print(" signature_index=%d", signature_ref_index_at(index));
2382 break;
2383 case JVM_CONSTANT_Utf8 :
2384 symbol_at(index)->print_value_on(st);
2385 break;
2386 case JVM_CONSTANT_ClassIndex: {
2387 int name_index = *int_at_addr(index);
2388 st->print("klass_index=%d ", name_index);
2389 symbol_at(name_index)->print_value_on(st);
2390 }
2391 break;
2392 case JVM_CONSTANT_UnresolvedClass : // fall-through
2393 case JVM_CONSTANT_UnresolvedClassInError: {
2394 CPKlassSlot kslot = klass_slot_at(index);
2395 int resolved_klass_index = kslot.resolved_klass_index();
2396 int name_index = kslot.name_index();
2397 assert(tag_at(name_index).is_symbol(), "sanity");
2398 symbol_at(name_index)->print_value_on(st);
2399 }
2400 break;
2401 case JVM_CONSTANT_MethodHandle :
2402 case JVM_CONSTANT_MethodHandleInError :
2403 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2404 st->print(" ref_index=%d", method_handle_index_at(index));
2405 break;
2406 case JVM_CONSTANT_MethodType :
2407 case JVM_CONSTANT_MethodTypeInError :
2408 st->print("signature_index=%d", method_type_index_at(index));
2409 break;
2410 case JVM_CONSTANT_Dynamic :
2411 case JVM_CONSTANT_DynamicInError :
2412 {
2413 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2414 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2415 int argc = bootstrap_argument_count_at(index);
2416 if (argc > 0) {
2417 for (int arg_i = 0; arg_i < argc; arg_i++) {
2418 int arg = bootstrap_argument_index_at(index, arg_i);
2419 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2420 }
2421 st->print("}");
2422 }
2423 }
2424 break;
2425 case JVM_CONSTANT_InvokeDynamic :
2426 {
2427 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2428 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2429 int argc = bootstrap_argument_count_at(index);
2430 if (argc > 0) {
2431 for (int arg_i = 0; arg_i < argc; arg_i++) {
2432 int arg = bootstrap_argument_index_at(index, arg_i);
2433 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2434 }
2435 st->print("}");
2436 }
2437 }
2438 break;
2439 default:
2440 ShouldNotReachHere();
2441 break;
2442 }
2443 st->cr();
2444 }
2445
2446 void ConstantPool::print_value_on(outputStream* st) const {
2447 assert(is_constantPool(), "must be constantPool");
2448 st->print("constant pool [%d]", length());
2449 if (has_preresolution()) st->print("/preresolution");
2450 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2451 print_address_on(st);
2452 if (pool_holder() != NULL) {
2453 st->print(" for ");
2454 pool_holder()->print_value_on(st);
2455 bool extra = (pool_holder()->constants() != this);
2456 if (extra) st->print(" (extra)");
2457 }
2458 if (cache() != NULL) {
2459 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2460 }
2461 }
2462
2463 // Verification
2464
2465 void ConstantPool::verify_on(outputStream* st) {
2466 guarantee(is_constantPool(), "object must be constant pool");
2467 for (int i = 0; i< length(); i++) {
2468 constantTag tag = tag_at(i);
2469 if (tag.is_klass() || tag.is_unresolved_klass()) {
2470 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2471 } else if (tag.is_symbol()) {
2472 Symbol* entry = symbol_at(i);
2473 guarantee(entry->refcount() != 0, "should have nonzero reference count");
2474 } else if (tag.is_string()) {
2475 Symbol* entry = unresolved_string_at(i);
2476 guarantee(entry->refcount() != 0, "should have nonzero reference count");
2477 }
2478 }
2479 if (pool_holder() != NULL) {
2480 // Note: pool_holder() can be NULL in temporary constant pools
2481 // used during constant pool merging
2482 guarantee(pool_holder()->is_klass(), "should be klass");
2483 }
2484 }