1 /*
2 * Copyright (c) 1997, 2023, 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 "cds/archiveHeapLoader.hpp"
27 #include "cds/archiveBuilder.hpp"
28 #include "cds/classPrelinker.hpp"
29 #include "cds/heapShared.hpp"
30 #include "classfile/classLoaderData.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/metadataOnStackMark.hpp"
33 #include "classfile/stringTable.hpp"
34 #include "classfile/systemDictionary.hpp"
35 #include "classfile/vmClasses.hpp"
36 #include "classfile/vmSymbols.hpp"
37 #include "code/codeCache.hpp"
38 #include "interpreter/bootstrapInfo.hpp"
39 #include "interpreter/linkResolver.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "memory/metadataFactory.hpp"
45 #include "memory/metaspaceClosure.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/array.hpp"
50 #include "oops/constantPool.inline.hpp"
51 #include "oops/cpCache.inline.hpp"
52 #include "oops/flatArrayKlass.hpp"
53 #include "oops/instanceKlass.hpp"
54 #include "oops/klass.inline.hpp"
55 #include "oops/objArrayKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/typeArrayOop.inline.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "runtime/atomic.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/init.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/javaThread.hpp"
65 #include "runtime/signature.hpp"
66 #include "runtime/vframe.inline.hpp"
67 #include "utilities/copy.hpp"
68
69 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
70 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
71 int size = ConstantPool::size(length);
72 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
73 }
74
75 void ConstantPool::copy_fields(const ConstantPool* orig) {
76 // Preserve dynamic constant information from the original pool
77 if (orig->has_dynamic_constant()) {
78 set_has_dynamic_constant();
79 }
80
81 set_major_version(orig->major_version());
82 set_minor_version(orig->minor_version());
83
84 set_source_file_name_index(orig->source_file_name_index());
85 set_generic_signature_index(orig->generic_signature_index());
86 }
87
88 #ifdef ASSERT
89
90 // MetaspaceObj allocation invariant is calloc equivalent memory
91 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
92 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
93 assert(tags != NULL, "invariant");
94 const int length = tags->length();
95 for (int index = 0; index < length; ++index) {
96 if (JVM_CONSTANT_Invalid != tags->at(index)) {
97 return false;
98 }
99 }
100 return true;
101 }
102
103 #endif
104
105 ConstantPool::ConstantPool(Array<u1>* tags) :
106 _tags(tags),
107 _length(tags->length()) {
108
109 assert(_tags != NULL, "invariant");
110 assert(tags->length() == _length, "invariant");
111 assert(tag_array_is_zero_initialized(tags), "invariant");
112 assert(0 == flags(), "invariant");
113 assert(0 == version(), "invariant");
114 assert(NULL == _pool_holder, "invariant");
115 }
116
117 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
118 if (cache() != NULL) {
119 MetadataFactory::free_metadata(loader_data, cache());
120 set_cache(NULL);
121 }
122
123 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
124 set_resolved_klasses(NULL);
125
126 MetadataFactory::free_array<jushort>(loader_data, operands());
127 set_operands(NULL);
128
129 release_C_heap_structures();
130
131 // free tag array
132 MetadataFactory::free_array<u1>(loader_data, tags());
133 set_tags(NULL);
134 }
135
136 void ConstantPool::release_C_heap_structures() {
137 // walk constant pool and decrement symbol reference counts
138 unreference_symbols();
139 }
140
141 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
142 log_trace(cds)("Iter(ConstantPool): %p", this);
143
144 it->push(&_tags, MetaspaceClosure::_writable);
145 it->push(&_cache);
146 it->push(&_pool_holder);
147 it->push(&_operands);
148 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
149
150 for (int i = 0; i < length(); i++) {
151 // The only MSO's embedded in the CP entries are Symbols:
152 // JVM_CONSTANT_String (normal and pseudo)
153 // JVM_CONSTANT_Utf8
154 constantTag ctag = tag_at(i);
155 if (ctag.is_string() || ctag.is_utf8()) {
156 it->push(symbol_at_addr(i));
157 }
158 }
159 }
160
161 objArrayOop ConstantPool::resolved_references() const {
162 return _cache->resolved_references();
163 }
164
165 // Called from outside constant pool resolution where a resolved_reference array
166 // may not be present.
167 objArrayOop ConstantPool::resolved_references_or_null() const {
168 if (_cache == NULL) {
169 return NULL;
170 } else {
171 return _cache->resolved_references();
172 }
173 }
174
175 oop ConstantPool::resolved_reference_at(int index) const {
176 oop result = resolved_references()->obj_at(index);
177 assert(oopDesc::is_oop_or_null(result), "Must be oop");
178 return result;
179 }
180
181 // Use a CAS for multithreaded access
182 oop ConstantPool::set_resolved_reference_at(int index, oop new_result) {
183 assert(oopDesc::is_oop_or_null(new_result), "Must be oop");
184 return resolved_references()->replace_if_null(index, new_result);
185 }
186
187 // Create resolved_references array and mapping array for original cp indexes
188 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
189 // to map it back for resolving and some unlikely miscellaneous uses.
190 // The objects created by invokedynamic are appended to this list.
191 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
192 const intStack& reference_map,
193 int constant_pool_map_length,
194 TRAPS) {
195 // Initialized the resolved object cache.
196 int map_length = reference_map.length();
197 if (map_length > 0) {
198 // Only need mapping back to constant pool entries. The map isn't used for
199 // invokedynamic resolved_reference entries. For invokedynamic entries,
200 // the constant pool cache index has the mapping back to both the constant
201 // pool and to the resolved reference index.
202 if (constant_pool_map_length > 0) {
203 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
204
205 for (int i = 0; i < constant_pool_map_length; i++) {
206 int x = reference_map.at(i);
207 assert(x == (int)(jushort) x, "klass index is too big");
208 om->at_put(i, (jushort)x);
209 }
210 set_reference_map(om);
211 }
212
213 // Create Java array for holding resolved strings, methodHandles,
214 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
215 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK);
216 Handle refs_handle (THREAD, stom); // must handleize.
217 set_resolved_references(loader_data->add_handle(refs_handle));
218 }
219 }
220
221 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
222 // A ConstantPool can't possibly have 0xffff valid class entries,
223 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
224 // entry for the class's name. So at most we will have 0xfffe class entries.
225 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
226 // UnresolvedKlass entries that are temporarily created during class redefinition.
227 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
228 assert(resolved_klasses() == NULL, "sanity");
229 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
230 set_resolved_klasses(rk);
231 }
232
233 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
234 int len = length();
235 int num_klasses = 0;
236 for (int i = 1; i <len; i++) {
237 switch (tag_at(i).value()) {
238 case JVM_CONSTANT_ClassIndex:
239 {
240 const int class_index = klass_index_at(i);
241 unresolved_klass_at_put(i, class_index, num_klasses++);
242 }
243 break;
244 #ifndef PRODUCT
245 case JVM_CONSTANT_Class:
246 case JVM_CONSTANT_UnresolvedClass:
247 case JVM_CONSTANT_UnresolvedClassInError:
248 // All of these should have been reverted back to Unresolved before calling
249 // this function.
250 ShouldNotReachHere();
251 #endif
252 }
253 }
254 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
255 }
256
257 // Hidden class support:
258 void ConstantPool::klass_at_put(int class_index, Klass* k) {
259 assert(k != NULL, "must be valid klass");
260 CPKlassSlot kslot = klass_slot_at(class_index);
261 int resolved_klass_index = kslot.resolved_klass_index();
262 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
263 Atomic::release_store(adr, k);
264
265 // The interpreter assumes when the tag is stored, the klass is resolved
266 // and the Klass* non-NULL, so we need hardware store ordering here.
267 assert(!k->name()->is_Q_signature(), "Q-type without JVM_CONSTANT_QDescBit");
268 release_tag_at_put(class_index, JVM_CONSTANT_Class);
269 }
270
271 #if INCLUDE_CDS_JAVA_HEAP
272 // Archive the resolved references
273 void ConstantPool::archive_resolved_references() {
274 if (_cache == NULL) {
275 return; // nothing to do
276 }
277
278 InstanceKlass *ik = pool_holder();
279 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() ||
280 ik->is_shared_app_class())) {
281 // Archiving resolved references for classes from non-builtin loaders
282 // is not yet supported.
283 return;
284 }
285
286 objArrayOop rr = resolved_references();
287 Array<u2>* ref_map = reference_map();
288 if (rr != NULL) {
289 int ref_map_len = ref_map == NULL ? 0 : ref_map->length();
290 int rr_len = rr->length();
291 for (int i = 0; i < rr_len; i++) {
292 oop obj = rr->obj_at(i);
293 rr->obj_at_put(i, NULL);
294 if (obj != NULL && i < ref_map_len) {
295 int index = object_to_cp_index(i);
296 if (tag_at(index).is_string()) {
297 oop archived_string = HeapShared::find_archived_heap_object(obj);
298 // Update the reference to point to the archived copy
299 // of this string.
300 // If the string is too large to archive, NULL is
301 // stored into rr. At run time, string_at_impl() will create and intern
302 // the string.
303 rr->obj_at_put(i, archived_string);
304 }
305 }
306 }
307
308 oop archived = HeapShared::archive_object(rr);
309 // If the resolved references array is not archived (too large),
310 // the 'archived' object is NULL. No need to explicitly check
311 // the return value of archive_object() here. At runtime, the
312 // resolved references will be created using the normal process
313 // when there is no archived value.
314 _cache->set_archived_references(archived);
315 }
316 }
317
318 void ConstantPool::add_dumped_interned_strings() {
319 objArrayOop rr = resolved_references();
320 if (rr != NULL) {
321 int rr_len = rr->length();
322 for (int i = 0; i < rr_len; i++) {
323 oop p = rr->obj_at(i);
324 if (java_lang_String::is_instance(p)) {
325 HeapShared::add_to_dumped_interned_strings(p);
326 }
327 }
328 }
329 }
330 #endif
331
332 #if INCLUDE_CDS
333 // CDS support. Create a new resolved_references array.
334 void ConstantPool::restore_unshareable_info(TRAPS) {
335 if (!_pool_holder->is_linked() && !_pool_holder->is_rewritten()) {
336 return;
337 }
338 assert(is_constantPool(), "ensure C++ vtable is restored");
339 assert(on_stack(), "should always be set for shared constant pools");
340 assert(is_shared(), "should always be set for shared constant pools");
341 assert(_cache != NULL, "constant pool _cache should not be NULL");
342
343 // Only create the new resolved references array if it hasn't been attempted before
344 if (resolved_references() != NULL) return;
345
346 if (vmClasses::Object_klass_loaded()) {
347 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
348 #if INCLUDE_CDS_JAVA_HEAP
349 if (ArchiveHeapLoader::is_fully_available() &&
350 _cache->archived_references() != NULL) {
351 oop archived = _cache->archived_references();
352 // Create handle for the archived resolved reference array object
353 Handle refs_handle(THREAD, archived);
354 set_resolved_references(loader_data->add_handle(refs_handle));
355 _cache->clear_archived_references();
356 } else
357 #endif
358 {
359 // No mapped archived resolved reference array
360 // Recreate the object array and add to ClassLoaderData.
361 int map_length = resolved_reference_length();
362 if (map_length > 0) {
363 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK);
364 Handle refs_handle(THREAD, stom); // must handleize.
365 set_resolved_references(loader_data->add_handle(refs_handle));
366 }
367 }
368 }
369 }
370
371 void ConstantPool::remove_unshareable_info() {
372 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
373 // The _on_stack flag is used to prevent ConstantPools from deallocation during
374 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
375 // we always set _on_stack to true to avoid having to change _flags during runtime.
376 _flags |= (_on_stack | _is_shared);
377
378 if (!_pool_holder->is_linked() && !_pool_holder->verified_at_dump_time()) {
379 return;
380 }
381 // Resolved references are not in the shared archive.
382 // Save the length for restoration. It is not necessarily the same length
383 // as reference_map.length() if invokedynamic is saved. It is needed when
384 // re-creating the resolved reference array if archived heap data cannot be map
385 // at runtime.
386 set_resolved_reference_length(
387 resolved_references() != NULL ? resolved_references()->length() : 0);
388 set_resolved_references(OopHandle());
389
390 bool archived = false;
391 for (int index = 1; index < length(); index++) { // Index 0 is unused
392 switch (tag_at(index).value()) {
393 case JVM_CONSTANT_UnresolvedClassInError:
394 {
395 jbyte qdesc_bit = tag_at(index).is_Qdescriptor_klass() ? (jbyte) JVM_CONSTANT_QDescBit : 0;
396 tag_at_put(index, JVM_CONSTANT_UnresolvedClass | qdesc_bit);
397 }
398 break;
399 case JVM_CONSTANT_MethodHandleInError:
400 tag_at_put(index, JVM_CONSTANT_MethodHandle);
401 break;
402 case JVM_CONSTANT_MethodTypeInError:
403 tag_at_put(index, JVM_CONSTANT_MethodType);
404 break;
405 case JVM_CONSTANT_DynamicInError:
406 tag_at_put(index, JVM_CONSTANT_Dynamic);
407 break;
408 case JVM_CONSTANT_Class:
409 archived = maybe_archive_resolved_klass_at(index);
410 ArchiveBuilder::alloc_stats()->record_klass_cp_entry(archived);
411 break;
412 }
413 }
414
415 if (cache() != NULL) {
416 // cache() is NULL if this class is not yet linked.
417 cache()->remove_unshareable_info();
418 }
419 }
420
421 bool ConstantPool::maybe_archive_resolved_klass_at(int cp_index) {
422 assert(ArchiveBuilder::current()->is_in_buffer_space(this), "must be");
423 assert(tag_at(cp_index).is_klass(), "must be resolved");
424
425 if (pool_holder()->is_hidden() && cp_index == pool_holder()->this_class_index()) {
426 // All references to a hidden class's own field/methods are through this
427 // index, which was resolved in ClassFileParser::fill_instance_klass. We
428 // must preserve it.
429 return true;
430 }
431
432 CPKlassSlot kslot = klass_slot_at(cp_index);
433 int resolved_klass_index = kslot.resolved_klass_index();
434 Klass* k = resolved_klasses()->at(resolved_klass_index);
435 // k could be NULL if the referenced class has been excluded via
436 // SystemDictionaryShared::is_excluded_class().
437
438 if (k != NULL) {
439 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(this);
440 if (ClassPrelinker::can_archive_resolved_klass(src_cp, cp_index)) {
441 if (log_is_enabled(Debug, cds, resolve)) {
442 ResourceMark rm;
443 log_debug(cds, resolve)("Resolved klass CP entry [%d]: %s => %s", cp_index,
444 pool_holder()->external_name(), k->external_name());
445 }
446 return true;
447 }
448 }
449
450 // This referenced class cannot be archived. Revert the tag to UnresolvedClass,
451 // so that the proper class loading and initialization can happen at runtime.
452 resolved_klasses()->at_put(resolved_klass_index, NULL);
453 jbyte qdesc_bit = tag_at(cp_index).is_Qdescriptor_klass() ? (jbyte) JVM_CONSTANT_QDescBit : 0;
454 tag_at_put(cp_index, JVM_CONSTANT_UnresolvedClass | qdesc_bit);
455 return false;
456 }
457 #endif // INCLUDE_CDS
458
459 int ConstantPool::cp_to_object_index(int cp_index) {
460 // this is harder don't do this so much.
461 int i = reference_map()->find(cp_index);
462 // We might not find the index for jsr292 call.
463 return (i < 0) ? _no_index_sentinel : i;
464 }
465
466 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
467 oop result = set_resolved_reference_at(obj_index, str);
468 assert(result == nullptr || result == str, "Only set once or to the same string.");
469 }
470
471 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
472 ResourceMark rm;
473 int line_number = -1;
474 const char * source_file = NULL;
475 if (JavaThread::current()->has_last_Java_frame()) {
476 // try to identify the method which called this function.
477 vframeStream vfst(JavaThread::current());
478 if (!vfst.at_end()) {
479 line_number = vfst.method()->line_number_from_bci(vfst.bci());
480 Symbol* s = vfst.method()->method_holder()->source_file_name();
481 if (s != NULL) {
482 source_file = s->as_C_string();
483 }
484 }
485 }
486 if (k != this_cp->pool_holder()) {
487 // only print something if the classes are different
488 if (source_file != NULL) {
489 log_debug(class, resolve)("%s %s %s:%d",
490 this_cp->pool_holder()->external_name(),
491 k->external_name(), source_file, line_number);
492 } else {
493 log_debug(class, resolve)("%s %s",
494 this_cp->pool_holder()->external_name(),
495 k->external_name());
496 }
497 }
498 }
499
500 void check_is_inline_type(Klass* k, TRAPS) {
501 if (!k->is_inline_klass()) {
502 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
503 }
504 }
505
506 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
507 TRAPS) {
508 JavaThread* javaThread = THREAD;
509
510 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
511 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
512 // the entry and tag is not updated atomically.
513 CPKlassSlot kslot = this_cp->klass_slot_at(which);
514 int resolved_klass_index = kslot.resolved_klass_index();
515 int name_index = kslot.name_index();
516 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
517
518 // The tag must be JVM_CONSTANT_Class in order to read the correct value from
519 // the unresolved_klasses() array.
520 if (this_cp->tag_at(which).is_klass()) {
521 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
522 if (klass != NULL) {
523 return klass;
524 }
525 }
526
527 // This tag doesn't change back to unresolved class unless at a safepoint.
528 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
529 // The original attempt to resolve this constant pool entry failed so find the
530 // class of the original error and throw another error of the same class
531 // (JVMS 5.4.3).
532 // If there is a detail message, pass that detail message to the error.
533 // The JVMS does not strictly require us to duplicate the same detail message,
534 // or any internal exception fields such as cause or stacktrace. But since the
535 // detail message is often a class name or other literal string, we will repeat it
536 // if we can find it in the symbol table.
537 throw_resolution_error(this_cp, which, CHECK_NULL);
538 ShouldNotReachHere();
539 }
540
541 Handle mirror_handle;
542 Symbol* name = this_cp->symbol_at(name_index);
543 bool inline_type_signature = false;
544 if (name->is_Q_signature()) {
545 name = name->fundamental_name(THREAD);
546 inline_type_signature = true;
547 }
548 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
549 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
550
551 Klass* k;
552 {
553 // Turn off the single stepping while doing class resolution
554 JvmtiHideSingleStepping jhss(javaThread);
555 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
556 } // JvmtiHideSingleStepping jhss(javaThread);
557 if (inline_type_signature) {
558 name->decrement_refcount();
559 }
560
561 if (!HAS_PENDING_EXCEPTION) {
562 // preserve the resolved klass from unloading
563 mirror_handle = Handle(THREAD, k->java_mirror());
564 // Do access check for klasses
565 verify_constant_pool_resolve(this_cp, k, THREAD);
566 }
567
568 if (!HAS_PENDING_EXCEPTION && inline_type_signature) {
569 check_is_inline_type(k, THREAD);
570 }
571
572 if (!HAS_PENDING_EXCEPTION) {
573 Klass* bottom_klass = NULL;
574 if (k->is_objArray_klass()) {
575 bottom_klass = ObjArrayKlass::cast(k)->bottom_klass();
576 assert(bottom_klass != NULL, "Should be set");
577 assert(bottom_klass->is_instance_klass() || bottom_klass->is_typeArray_klass(), "Sanity check");
578 } else if (k->is_flatArray_klass()) {
579 bottom_klass = FlatArrayKlass::cast(k)->element_klass();
580 assert(bottom_klass != NULL, "Should be set");
581 }
582 }
583
584 // Failed to resolve class. We must record the errors so that subsequent attempts
585 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
586 if (HAS_PENDING_EXCEPTION) {
587 jbyte tag = JVM_CONSTANT_UnresolvedClass;
588 if (this_cp->tag_at(which).is_Qdescriptor_klass()) {
589 tag |= JVM_CONSTANT_QDescBit;
590 }
591 save_and_throw_exception(this_cp, which, constantTag(tag), CHECK_NULL);
592 // If CHECK_NULL above doesn't return the exception, that means that
593 // some other thread has beaten us and has resolved the class.
594 // To preserve old behavior, we return the resolved class.
595 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
596 assert(klass != NULL, "must be resolved if exception was cleared");
597 return klass;
598 }
599
600 // logging for class+resolve.
601 if (log_is_enabled(Debug, class, resolve)){
602 trace_class_resolution(this_cp, k);
603 }
604
605 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
606 Atomic::release_store(adr, k);
607 // The interpreter assumes when the tag is stored, the klass is resolved
608 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
609 // hardware store ordering here.
610 jbyte tag = JVM_CONSTANT_Class;
611 if (this_cp->tag_at(which).is_Qdescriptor_klass()) {
612 tag |= JVM_CONSTANT_QDescBit;
613 }
614 // We also need to CAS to not overwrite an error from a racing thread.
615
616 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
617 (jbyte)JVM_CONSTANT_UnresolvedClass,
618 tag);
619
620 // We need to recheck exceptions from racing thread and return the same.
621 if (old_tag == JVM_CONSTANT_UnresolvedClassInError) {
622 // Remove klass.
623 this_cp->resolved_klasses()->at_put(resolved_klass_index, NULL);
624 throw_resolution_error(this_cp, which, CHECK_NULL);
625 }
626
627 return k;
628 }
629
630
631 // Does not update ConstantPool* - to avoid any exception throwing. Used
632 // by compiler and exception handling. Also used to avoid classloads for
633 // instanceof operations. Returns NULL if the class has not been loaded or
634 // if the verification of constant pool failed
635 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
636 CPKlassSlot kslot = this_cp->klass_slot_at(which);
637 int resolved_klass_index = kslot.resolved_klass_index();
638 int name_index = kslot.name_index();
639 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
640
641 if (this_cp->tag_at(which).is_klass()) {
642 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
643 assert(k != NULL, "should be resolved");
644 return k;
645 } else if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
646 return NULL;
647 } else {
648 Thread* current = Thread::current();
649 Symbol* name = this_cp->symbol_at(name_index);
650 oop loader = this_cp->pool_holder()->class_loader();
651 oop protection_domain = this_cp->pool_holder()->protection_domain();
652 Handle h_prot (current, protection_domain);
653 Handle h_loader (current, loader);
654 Klass* k = SystemDictionary::find_instance_klass(current, name, h_loader, h_prot);
655
656 // Avoid constant pool verification at a safepoint, as it takes the Module_lock.
657 if (k != NULL && current->is_Java_thread()) {
658 // Make sure that resolving is legal
659 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
660 ExceptionMark em(THREAD);
661 // return NULL if verification fails
662 verify_constant_pool_resolve(this_cp, k, THREAD);
663 if (HAS_PENDING_EXCEPTION) {
664 CLEAR_PENDING_EXCEPTION;
665 return NULL;
666 }
667 return k;
668 } else {
669 return k;
670 }
671 }
672 }
673
674 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
675 int which) {
676 if (cpool->cache() == NULL) return NULL; // nothing to load yet
677 int cache_index = decode_cpcache_index(which, true);
678 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
679 // FIXME: should be an assert
680 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
681 return NULL;
682 }
683 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
684 return e->method_if_resolved(cpool);
685 }
686
687
688 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
689 if (cpool->cache() == NULL) return false; // nothing to load yet
690 int cache_index = decode_cpcache_index(which, true);
691 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
692 return e->has_appendix();
693 }
694
695 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
696 if (cpool->cache() == NULL) return NULL; // nothing to load yet
697 int cache_index = decode_cpcache_index(which, true);
698 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
699 return e->appendix_if_resolved(cpool);
700 }
701
702
703 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) {
704 if (cpool->cache() == NULL) return false; // nothing to load yet
705 int cache_index = decode_cpcache_index(which, true);
706 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
707 return e->has_local_signature();
708 }
709
710 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
711 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
712 return symbol_at(name_index);
713 }
714
715
716 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
717 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
718 return symbol_at(signature_index);
719 }
720
721 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
722 int i = which;
723 if (!uncached && cache() != NULL) {
724 if (ConstantPool::is_invokedynamic_index(which)) {
725 // Invokedynamic index is index into the constant pool cache
726 int pool_index = invokedynamic_bootstrap_ref_index_at(which);
727 pool_index = bootstrap_name_and_type_ref_index_at(pool_index);
728 assert(tag_at(pool_index).is_name_and_type(), "");
729 return pool_index;
730 }
731 // change byte-ordering and go via cache
732 i = remap_instruction_operand_from_cache(which);
733 } else {
734 if (tag_at(which).has_bootstrap()) {
735 int pool_index = bootstrap_name_and_type_ref_index_at(which);
736 assert(tag_at(pool_index).is_name_and_type(), "");
737 return pool_index;
738 }
739 }
740 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
741 assert(!tag_at(i).has_bootstrap(), "Must be handled above");
742 jint ref_index = *int_at_addr(i);
743 return extract_high_short_from_int(ref_index);
744 }
745
746 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
747 int pool_index = which;
748 if (!uncached && cache() != NULL) {
749 if (ConstantPool::is_invokedynamic_index(which)) {
750 // Invokedynamic index is index into resolved_references
751 pool_index = invokedynamic_bootstrap_ref_index_at(which);
752 } else {
753 // change byte-ordering and go via cache
754 pool_index = remap_instruction_operand_from_cache(which);
755 }
756 }
757 return tag_at(pool_index);
758 }
759
760 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
761 guarantee(!ConstantPool::is_invokedynamic_index(which),
762 "an invokedynamic instruction does not have a klass");
763 int i = which;
764 if (!uncached && cache() != NULL) {
765 // change byte-ordering and go via cache
766 i = remap_instruction_operand_from_cache(which);
767 }
768 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
769 jint ref_index = *int_at_addr(i);
770 return extract_low_short_from_int(ref_index);
771 }
772
773
774
775 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
776 int cpc_index = operand;
777 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
778 assert((int)(u2)cpc_index == cpc_index, "clean u2");
779 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
780 return member_index;
781 }
782
783
784 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
785 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
786 return; // short cut, typeArray klass is always accessible
787 }
788 Klass* holder = this_cp->pool_holder();
789 LinkResolver::check_klass_accessibility(holder, k, CHECK);
790 }
791
792
793 int ConstantPool::name_ref_index_at(int which_nt) {
794 jint ref_index = name_and_type_at(which_nt);
795 return extract_low_short_from_int(ref_index);
796 }
797
798
799 int ConstantPool::signature_ref_index_at(int which_nt) {
800 jint ref_index = name_and_type_at(which_nt);
801 return extract_high_short_from_int(ref_index);
802 }
803
804
805 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
806 return klass_at(klass_ref_index_at(which), THREAD);
807 }
808
809 Symbol* ConstantPool::klass_name_at(int which) const {
810 return symbol_at(klass_slot_at(which).name_index());
811 }
812
813 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
814 jint ref_index = klass_ref_index_at(which);
815 return klass_at_noresolve(ref_index);
816 }
817
818 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
819 jint ref_index = uncached_klass_ref_index_at(which);
820 return klass_at_noresolve(ref_index);
821 }
822
823 char* ConstantPool::string_at_noresolve(int which) {
824 return unresolved_string_at(which)->as_C_string();
825 }
826
827 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
828 return Signature::basic_type(symbol_at(which));
829 }
830
831
832 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
833 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
834 if (this_cp->tag_at(index).is_string()) {
835 this_cp->string_at(index, CHECK);
836 }
837 }
838 }
839
840 static Symbol* exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
841 // Dig out the detailed message to reuse if possible
842 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
843 if (message != NULL) {
844 return message;
845 }
846
847 // Return specific message for the tag
848 switch (tag.value()) {
849 case JVM_CONSTANT_UnresolvedClass:
850 // return the class name in the error message
851 message = this_cp->klass_name_at(which);
852 break;
853 case JVM_CONSTANT_MethodHandle:
854 // return the method handle name in the error message
855 message = this_cp->method_handle_name_ref_at(which);
856 break;
857 case JVM_CONSTANT_MethodType:
858 // return the method type signature in the error message
859 message = this_cp->method_type_signature_at(which);
860 break;
861 case JVM_CONSTANT_Dynamic:
862 // return the name of the condy in the error message
863 message = this_cp->uncached_name_ref_at(which);
864 break;
865 default:
866 ShouldNotReachHere();
867 }
868
869 return message;
870 }
871
872 static void add_resolution_error(const constantPoolHandle& this_cp, int which,
873 constantTag tag, oop pending_exception) {
874
875 Symbol* error = pending_exception->klass()->name();
876 oop cause = java_lang_Throwable::cause(pending_exception);
877
878 // Also dig out the exception cause, if present.
879 Symbol* cause_sym = NULL;
880 Symbol* cause_msg = NULL;
881 if (cause != NULL && cause != pending_exception) {
882 cause_sym = cause->klass()->name();
883 cause_msg = java_lang_Throwable::detail_message(cause);
884 }
885
886 Symbol* message = exception_message(this_cp, which, tag, pending_exception);
887 SystemDictionary::add_resolution_error(this_cp, which, error, message, cause_sym, cause_msg);
888 }
889
890
891 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
892 ResourceMark rm(THREAD);
893 Symbol* message = NULL;
894 Symbol* cause = NULL;
895 Symbol* cause_msg = NULL;
896 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message, &cause, &cause_msg);
897 assert(error != NULL, "checking");
898 const char* cause_str = cause_msg != NULL ? cause_msg->as_C_string() : NULL;
899
900 CLEAR_PENDING_EXCEPTION;
901 if (message != NULL) {
902 char* msg = message->as_C_string();
903 if (cause != NULL) {
904 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_str);
905 THROW_MSG_CAUSE(error, msg, h_cause);
906 } else {
907 THROW_MSG(error, msg);
908 }
909 } else {
910 if (cause != NULL) {
911 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_str);
912 THROW_CAUSE(error, h_cause);
913 } else {
914 THROW(error);
915 }
916 }
917 }
918
919 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
920 // exception in the resolution error table, so that the same exception is thrown again.
921 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
922 constantTag tag, TRAPS) {
923
924 int error_tag = tag.error_value();
925
926 if (!PENDING_EXCEPTION->
927 is_a(vmClasses::LinkageError_klass())) {
928 // Just throw the exception and don't prevent these classes from
929 // being loaded due to virtual machine errors like StackOverflow
930 // and OutOfMemoryError, etc, or if the thread was hit by stop()
931 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
932 } else if (this_cp->tag_at(which).value() != error_tag) {
933 add_resolution_error(this_cp, which, tag, PENDING_EXCEPTION);
934 // CAS in the tag. If a thread beat us to registering this error that's fine.
935 // If another thread resolved the reference, this is a race condition. This
936 // thread may have had a security manager or something temporary.
937 // This doesn't deterministically get an error. So why do we save this?
938 // We save this because jvmti can add classes to the bootclass path after
939 // this error, so it needs to get the same error if the error is first.
940 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
941 (jbyte)tag.value(),
942 (jbyte)error_tag);
943 if (old_tag != error_tag && old_tag != tag.value()) {
944 // MethodHandles and MethodType doesn't change to resolved version.
945 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
946 // Forget the exception and use the resolved class.
947 CLEAR_PENDING_EXCEPTION;
948 }
949 } else {
950 // some other thread put this in error state
951 throw_resolution_error(this_cp, which, CHECK);
952 }
953 }
954
955 constantTag ConstantPool::constant_tag_at(int which) {
956 constantTag tag = tag_at(which);
957 if (tag.is_dynamic_constant()) {
958 BasicType bt = basic_type_for_constant_at(which);
959 return constantTag(constantTag::type2tag(bt));
960 }
961 return tag;
962 }
963
964 BasicType ConstantPool::basic_type_for_constant_at(int which) {
965 constantTag tag = tag_at(which);
966 if (tag.is_dynamic_constant() ||
967 tag.is_dynamic_constant_in_error()) {
968 // have to look at the signature for this one
969 Symbol* constant_type = uncached_signature_ref_at(which);
970 return Signature::basic_type(constant_type);
971 }
972 return tag.basic_type();
973 }
974
975 // Called to resolve constants in the constant pool and return an oop.
976 // Some constant pool entries cache their resolved oop. This is also
977 // called to create oops from constants to use in arguments for invokedynamic
978 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
979 int index, int cache_index,
980 bool* status_return, TRAPS) {
981 oop result_oop = NULL;
982 Handle throw_exception;
983
984 if (cache_index == _possible_index_sentinel) {
985 // It is possible that this constant is one which is cached in the objects.
986 // We'll do a linear search. This should be OK because this usage is rare.
987 // FIXME: If bootstrap specifiers stress this code, consider putting in
988 // a reverse index. Binary search over a short array should do it.
989 assert(index > 0, "valid index");
990 cache_index = this_cp->cp_to_object_index(index);
991 }
992 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
993 assert(index == _no_index_sentinel || index >= 0, "");
994
995 if (cache_index >= 0) {
996 result_oop = this_cp->resolved_reference_at(cache_index);
997 if (result_oop != NULL) {
998 if (result_oop == Universe::the_null_sentinel()) {
999 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index)));
1000 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
1001 result_oop = NULL;
1002 }
1003 if (status_return != NULL) (*status_return) = true;
1004 return result_oop;
1005 // That was easy...
1006 }
1007 index = this_cp->object_to_cp_index(cache_index);
1008 }
1009
1010 jvalue prim_value; // temp used only in a few cases below
1011
1012 constantTag tag = this_cp->tag_at(index);
1013
1014 if (status_return != NULL) {
1015 // don't trigger resolution if the constant might need it
1016 switch (tag.value()) {
1017 case JVM_CONSTANT_Class:
1018 {
1019 CPKlassSlot kslot = this_cp->klass_slot_at(index);
1020 int resolved_klass_index = kslot.resolved_klass_index();
1021 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) {
1022 (*status_return) = false;
1023 return NULL;
1024 }
1025 // the klass is waiting in the CP; go get it
1026 break;
1027 }
1028 case JVM_CONSTANT_String:
1029 case JVM_CONSTANT_Integer:
1030 case JVM_CONSTANT_Float:
1031 case JVM_CONSTANT_Long:
1032 case JVM_CONSTANT_Double:
1033 // these guys trigger OOM at worst
1034 break;
1035 default:
1036 (*status_return) = false;
1037 return NULL;
1038 }
1039 // from now on there is either success or an OOME
1040 (*status_return) = true;
1041 }
1042
1043 switch (tag.value()) {
1044
1045 case JVM_CONSTANT_UnresolvedClass:
1046 case JVM_CONSTANT_Class:
1047 {
1048 assert(cache_index == _no_index_sentinel, "should not have been set");
1049 Klass* resolved = klass_at_impl(this_cp, index, CHECK_NULL);
1050 // ldc wants the java mirror.
1051 result_oop = tag.is_Qdescriptor_klass()
1052 ? InlineKlass::cast(resolved)->val_mirror()
1053 : resolved->java_mirror();
1054 break;
1055 }
1056
1057 case JVM_CONSTANT_Dynamic:
1058 {
1059 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
1060 BootstrapInfo bootstrap_specifier(this_cp, index);
1061
1062 // The initial step in resolving an unresolved symbolic reference to a
1063 // dynamically-computed constant is to resolve the symbolic reference to a
1064 // method handle which will be the bootstrap method for the dynamically-computed
1065 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
1066 // method fails, then a MethodHandleInError is stored at the corresponding
1067 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
1068 // set a DynamicConstantInError here since any subsequent use of this
1069 // bootstrap method will encounter the resolution of MethodHandleInError.
1070 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
1071 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
1072 // for the bootstrap_specifier created above.
1073 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1074 Exceptions::wrap_dynamic_exception(/* is_indy */ false, THREAD);
1075 if (HAS_PENDING_EXCEPTION) {
1076 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
1077 // will check for a LinkageError and store a DynamicConstantInError.
1078 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1079 }
1080 result_oop = bootstrap_specifier.resolved_value()();
1081 BasicType type = Signature::basic_type(bootstrap_specifier.signature());
1082 if (!is_reference_type(type)) {
1083 // Make sure the primitive value is properly boxed.
1084 // This is a JDK responsibility.
1085 const char* fail = NULL;
1086 if (result_oop == NULL) {
1087 fail = "null result instead of box";
1088 } else if (!is_java_primitive(type)) {
1089 // FIXME: support value types via unboxing
1090 fail = "can only handle references and primitives";
1091 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
1092 fail = "primitive is not properly boxed";
1093 }
1094 if (fail != NULL) {
1095 // Since this exception is not a LinkageError, throw exception
1096 // but do not save a DynamicInError resolution result.
1097 // See section 5.4.3 of the VM spec.
1098 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
1099 }
1100 }
1101
1102 LogTarget(Debug, methodhandles, condy) lt_condy;
1103 if (lt_condy.is_enabled()) {
1104 LogStream ls(lt_condy);
1105 bootstrap_specifier.print_msg_on(&ls, "resolve_constant_at_impl");
1106 }
1107 break;
1108 }
1109
1110 case JVM_CONSTANT_String:
1111 assert(cache_index != _no_index_sentinel, "should have been set");
1112 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
1113 break;
1114
1115 case JVM_CONSTANT_MethodHandle:
1116 {
1117 int ref_kind = this_cp->method_handle_ref_kind_at(index);
1118 int callee_index = this_cp->method_handle_klass_index_at(index);
1119 Symbol* name = this_cp->method_handle_name_ref_at(index);
1120 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
1121 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
1122 { ResourceMark rm(THREAD);
1123 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1124 ref_kind, index, this_cp->method_handle_index_at(index),
1125 callee_index, name->as_C_string(), signature->as_C_string());
1126 }
1127
1128 Klass* callee = klass_at_impl(this_cp, callee_index, THREAD);
1129 if (HAS_PENDING_EXCEPTION) {
1130 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1131 }
1132
1133 // Check constant pool method consistency
1134 if ((callee->is_interface() && m_tag.is_method()) ||
1135 (!callee->is_interface() && m_tag.is_interface_method())) {
1136 ResourceMark rm(THREAD);
1137 stringStream ss;
1138 ss.print("Inconsistent constant pool data in classfile for class %s. "
1139 "Method '", callee->name()->as_C_string());
1140 signature->print_as_signature_external_return_type(&ss);
1141 ss.print(" %s(", name->as_C_string());
1142 signature->print_as_signature_external_parameters(&ss);
1143 ss.print(")' at index %d is %s and should be %s",
1144 index,
1145 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1146 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1147 Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), "%s", ss.as_string());
1148 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1149 }
1150
1151 Klass* klass = this_cp->pool_holder();
1152 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1153 callee, name, signature,
1154 THREAD);
1155 if (HAS_PENDING_EXCEPTION) {
1156 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1157 }
1158 result_oop = value();
1159 break;
1160 }
1161
1162 case JVM_CONSTANT_MethodType:
1163 {
1164 Symbol* signature = this_cp->method_type_signature_at(index);
1165 { ResourceMark rm(THREAD);
1166 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1167 index, this_cp->method_type_index_at(index),
1168 signature->as_C_string());
1169 }
1170 Klass* klass = this_cp->pool_holder();
1171 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1172 result_oop = value();
1173 if (HAS_PENDING_EXCEPTION) {
1174 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1175 }
1176 break;
1177 }
1178
1179 case JVM_CONSTANT_Integer:
1180 assert(cache_index == _no_index_sentinel, "should not have been set");
1181 prim_value.i = this_cp->int_at(index);
1182 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1183 break;
1184
1185 case JVM_CONSTANT_Float:
1186 assert(cache_index == _no_index_sentinel, "should not have been set");
1187 prim_value.f = this_cp->float_at(index);
1188 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1189 break;
1190
1191 case JVM_CONSTANT_Long:
1192 assert(cache_index == _no_index_sentinel, "should not have been set");
1193 prim_value.j = this_cp->long_at(index);
1194 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1195 break;
1196
1197 case JVM_CONSTANT_Double:
1198 assert(cache_index == _no_index_sentinel, "should not have been set");
1199 prim_value.d = this_cp->double_at(index);
1200 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1201 break;
1202
1203 case JVM_CONSTANT_UnresolvedClassInError:
1204 case JVM_CONSTANT_DynamicInError:
1205 case JVM_CONSTANT_MethodHandleInError:
1206 case JVM_CONSTANT_MethodTypeInError:
1207 throw_resolution_error(this_cp, index, CHECK_NULL);
1208 break;
1209
1210 default:
1211 fatal("unexpected constant tag at CP %p[%d/%d] = %d", this_cp(), index, cache_index, tag.value());
1212 break;
1213 }
1214
1215 if (cache_index >= 0) {
1216 // Benign race condition: resolved_references may already be filled in.
1217 // The important thing here is that all threads pick up the same result.
1218 // It doesn't matter which racing thread wins, as long as only one
1219 // result is used by all threads, and all future queries.
1220 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop);
1221 oop old_result = this_cp->set_resolved_reference_at(cache_index, new_result);
1222 if (old_result == nullptr) {
1223 return result_oop; // was installed
1224 } else {
1225 // Return the winning thread's result. This can be different than
1226 // the result here for MethodHandles.
1227 if (old_result == Universe::the_null_sentinel())
1228 old_result = NULL;
1229 return old_result;
1230 }
1231 } else {
1232 assert(result_oop != Universe::the_null_sentinel(), "");
1233 return result_oop;
1234 }
1235 }
1236
1237 oop ConstantPool::uncached_string_at(int which, TRAPS) {
1238 Symbol* sym = unresolved_string_at(which);
1239 oop str = StringTable::intern(sym, CHECK_(NULL));
1240 assert(java_lang_String::is_instance(str), "must be string");
1241 return str;
1242 }
1243
1244 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index,
1245 int start_arg, int end_arg,
1246 objArrayHandle info, int pos,
1247 bool must_resolve, Handle if_not_available,
1248 TRAPS) {
1249 int limit = pos + end_arg - start_arg;
1250 // checks: index in range [0..this_cp->length),
1251 // tag at index, start..end in range [0..this_cp->bootstrap_argument_count],
1252 // info array non-null, pos..limit in [0..info.length]
1253 if ((0 >= index || index >= this_cp->length()) ||
1254 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1255 this_cp->tag_at(index).is_dynamic_constant()) ||
1256 (0 > start_arg || start_arg > end_arg) ||
1257 (end_arg > this_cp->bootstrap_argument_count_at(index)) ||
1258 (0 > pos || pos > limit) ||
1259 (info.is_null() || limit > info->length())) {
1260 // An index or something else went wrong; throw an error.
1261 // Since this is an internal API, we don't expect this,
1262 // so we don't bother to craft a nice message.
1263 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1264 }
1265 // now we can loop safely
1266 int info_i = pos;
1267 for (int i = start_arg; i < end_arg; i++) {
1268 int arg_index = this_cp->bootstrap_argument_index_at(index, i);
1269 oop arg_oop;
1270 if (must_resolve) {
1271 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1272 } else {
1273 bool found_it = false;
1274 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1275 if (!found_it) arg_oop = if_not_available();
1276 }
1277 info->obj_at_put(info_i++, arg_oop);
1278 }
1279 }
1280
1281 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1282 // If the string has already been interned, this entry will be non-null
1283 oop str = this_cp->resolved_reference_at(obj_index);
1284 assert(str != Universe::the_null_sentinel(), "");
1285 if (str != NULL) return str;
1286 Symbol* sym = this_cp->unresolved_string_at(which);
1287 str = StringTable::intern(sym, CHECK_(NULL));
1288 this_cp->string_at_put(which, obj_index, str);
1289 assert(java_lang_String::is_instance(str), "must be string");
1290 return str;
1291 }
1292
1293
1294 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1295 // Names are interned, so we can compare Symbol*s directly
1296 Symbol* cp_name = klass_name_at(which);
1297 return (cp_name == k->name());
1298 }
1299
1300
1301 // Iterate over symbols and decrement ones which are Symbol*s
1302 // This is done during GC.
1303 // Only decrement the UTF8 symbols. Strings point to
1304 // these symbols but didn't increment the reference count.
1305 void ConstantPool::unreference_symbols() {
1306 for (int index = 1; index < length(); index++) { // Index 0 is unused
1307 constantTag tag = tag_at(index);
1308 if (tag.is_symbol()) {
1309 symbol_at(index)->decrement_refcount();
1310 }
1311 }
1312 }
1313
1314
1315 // Compare this constant pool's entry at index1 to the constant pool
1316 // cp2's entry at index2.
1317 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1318 int index2) {
1319
1320 // The error tags are equivalent to non-error tags when comparing
1321 jbyte t1 = tag_at(index1).non_error_value();
1322 jbyte t2 = cp2->tag_at(index2).non_error_value();
1323
1324 if (t1 != t2) {
1325 // Not the same entry type so there is nothing else to check. Note
1326 // that this style of checking will consider resolved/unresolved
1327 // class pairs as different.
1328 // From the ConstantPool* API point of view, this is correct
1329 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1330 // plays out in the context of ConstantPool* merging.
1331 return false;
1332 }
1333
1334 switch (t1) {
1335 case JVM_CONSTANT_Class:
1336 {
1337 Klass* k1 = resolved_klass_at(index1);
1338 Klass* k2 = cp2->resolved_klass_at(index2);
1339 if (k1 == k2) {
1340 return true;
1341 }
1342 } break;
1343
1344 case JVM_CONSTANT_ClassIndex:
1345 {
1346 int recur1 = klass_index_at(index1);
1347 int recur2 = cp2->klass_index_at(index2);
1348 if (compare_entry_to(recur1, cp2, recur2)) {
1349 return true;
1350 }
1351 } break;
1352
1353 case JVM_CONSTANT_Double:
1354 {
1355 jdouble d1 = double_at(index1);
1356 jdouble d2 = cp2->double_at(index2);
1357 if (d1 == d2) {
1358 return true;
1359 }
1360 } break;
1361
1362 case JVM_CONSTANT_Fieldref:
1363 case JVM_CONSTANT_InterfaceMethodref:
1364 case JVM_CONSTANT_Methodref:
1365 {
1366 int recur1 = uncached_klass_ref_index_at(index1);
1367 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1368 bool match = compare_entry_to(recur1, cp2, recur2);
1369 if (match) {
1370 recur1 = uncached_name_and_type_ref_index_at(index1);
1371 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1372 if (compare_entry_to(recur1, cp2, recur2)) {
1373 return true;
1374 }
1375 }
1376 } break;
1377
1378 case JVM_CONSTANT_Float:
1379 {
1380 jfloat f1 = float_at(index1);
1381 jfloat f2 = cp2->float_at(index2);
1382 if (f1 == f2) {
1383 return true;
1384 }
1385 } break;
1386
1387 case JVM_CONSTANT_Integer:
1388 {
1389 jint i1 = int_at(index1);
1390 jint i2 = cp2->int_at(index2);
1391 if (i1 == i2) {
1392 return true;
1393 }
1394 } break;
1395
1396 case JVM_CONSTANT_Long:
1397 {
1398 jlong l1 = long_at(index1);
1399 jlong l2 = cp2->long_at(index2);
1400 if (l1 == l2) {
1401 return true;
1402 }
1403 } break;
1404
1405 case JVM_CONSTANT_NameAndType:
1406 {
1407 int recur1 = name_ref_index_at(index1);
1408 int recur2 = cp2->name_ref_index_at(index2);
1409 if (compare_entry_to(recur1, cp2, recur2)) {
1410 recur1 = signature_ref_index_at(index1);
1411 recur2 = cp2->signature_ref_index_at(index2);
1412 if (compare_entry_to(recur1, cp2, recur2)) {
1413 return true;
1414 }
1415 }
1416 } break;
1417
1418 case JVM_CONSTANT_StringIndex:
1419 {
1420 int recur1 = string_index_at(index1);
1421 int recur2 = cp2->string_index_at(index2);
1422 if (compare_entry_to(recur1, cp2, recur2)) {
1423 return true;
1424 }
1425 } break;
1426
1427 case JVM_CONSTANT_UnresolvedClass:
1428 {
1429 Symbol* k1 = klass_name_at(index1);
1430 Symbol* k2 = cp2->klass_name_at(index2);
1431 if (k1 == k2) {
1432 return true;
1433 }
1434 } break;
1435
1436 case JVM_CONSTANT_MethodType:
1437 {
1438 int k1 = method_type_index_at(index1);
1439 int k2 = cp2->method_type_index_at(index2);
1440 if (compare_entry_to(k1, cp2, k2)) {
1441 return true;
1442 }
1443 } break;
1444
1445 case JVM_CONSTANT_MethodHandle:
1446 {
1447 int k1 = method_handle_ref_kind_at(index1);
1448 int k2 = cp2->method_handle_ref_kind_at(index2);
1449 if (k1 == k2) {
1450 int i1 = method_handle_index_at(index1);
1451 int i2 = cp2->method_handle_index_at(index2);
1452 if (compare_entry_to(i1, cp2, i2)) {
1453 return true;
1454 }
1455 }
1456 } break;
1457
1458 case JVM_CONSTANT_Dynamic:
1459 {
1460 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1461 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1462 int i1 = bootstrap_methods_attribute_index(index1);
1463 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1464 bool match_entry = compare_entry_to(k1, cp2, k2);
1465 bool match_operand = compare_operand_to(i1, cp2, i2);
1466 return (match_entry && match_operand);
1467 } break;
1468
1469 case JVM_CONSTANT_InvokeDynamic:
1470 {
1471 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1472 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1473 int i1 = bootstrap_methods_attribute_index(index1);
1474 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1475 bool match_entry = compare_entry_to(k1, cp2, k2);
1476 bool match_operand = compare_operand_to(i1, cp2, i2);
1477 return (match_entry && match_operand);
1478 } break;
1479
1480 case JVM_CONSTANT_String:
1481 {
1482 Symbol* s1 = unresolved_string_at(index1);
1483 Symbol* s2 = cp2->unresolved_string_at(index2);
1484 if (s1 == s2) {
1485 return true;
1486 }
1487 } break;
1488
1489 case JVM_CONSTANT_Utf8:
1490 {
1491 Symbol* s1 = symbol_at(index1);
1492 Symbol* s2 = cp2->symbol_at(index2);
1493 if (s1 == s2) {
1494 return true;
1495 }
1496 } break;
1497
1498 // Invalid is used as the tag for the second constant pool entry
1499 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1500 // not be seen by itself.
1501 case JVM_CONSTANT_Invalid: // fall through
1502
1503 default:
1504 ShouldNotReachHere();
1505 break;
1506 }
1507
1508 return false;
1509 } // end compare_entry_to()
1510
1511
1512 // Resize the operands array with delta_len and delta_size.
1513 // Used in RedefineClasses for CP merge.
1514 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1515 int old_len = operand_array_length(operands());
1516 int new_len = old_len + delta_len;
1517 int min_len = (delta_len > 0) ? old_len : new_len;
1518
1519 int old_size = operands()->length();
1520 int new_size = old_size + delta_size;
1521 int min_size = (delta_size > 0) ? old_size : new_size;
1522
1523 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1524 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1525
1526 // Set index in the resized array for existing elements only
1527 for (int idx = 0; idx < min_len; idx++) {
1528 int offset = operand_offset_at(idx); // offset in original array
1529 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1530 }
1531 // Copy the bootstrap specifiers only
1532 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1533 new_ops->adr_at(2*new_len),
1534 (min_size - 2*min_len) * sizeof(u2));
1535 // Explicitly deallocate old operands array.
1536 // Note, it is not needed for 7u backport.
1537 if ( operands() != NULL) { // the safety check
1538 MetadataFactory::free_array<u2>(loader_data, operands());
1539 }
1540 set_operands(new_ops);
1541 } // end resize_operands()
1542
1543
1544 // Extend the operands array with the length and size of the ext_cp operands.
1545 // Used in RedefineClasses for CP merge.
1546 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1547 int delta_len = operand_array_length(ext_cp->operands());
1548 if (delta_len == 0) {
1549 return; // nothing to do
1550 }
1551 int delta_size = ext_cp->operands()->length();
1552
1553 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1554
1555 if (operand_array_length(operands()) == 0) {
1556 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1557 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1558 // The first element index defines the offset of second part
1559 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1560 set_operands(new_ops);
1561 } else {
1562 resize_operands(delta_len, delta_size, CHECK);
1563 }
1564
1565 } // end extend_operands()
1566
1567
1568 // Shrink the operands array to a smaller array with new_len length.
1569 // Used in RedefineClasses for CP merge.
1570 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1571 int old_len = operand_array_length(operands());
1572 if (new_len == old_len) {
1573 return; // nothing to do
1574 }
1575 assert(new_len < old_len, "shrunken operands array must be smaller");
1576
1577 int free_base = operand_next_offset_at(new_len - 1);
1578 int delta_len = new_len - old_len;
1579 int delta_size = 2*delta_len + free_base - operands()->length();
1580
1581 resize_operands(delta_len, delta_size, CHECK);
1582
1583 } // end shrink_operands()
1584
1585
1586 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1587 const constantPoolHandle& to_cp,
1588 TRAPS) {
1589
1590 int from_oplen = operand_array_length(from_cp->operands());
1591 int old_oplen = operand_array_length(to_cp->operands());
1592 if (from_oplen != 0) {
1593 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1594 // append my operands to the target's operands array
1595 if (old_oplen == 0) {
1596 // Can't just reuse from_cp's operand list because of deallocation issues
1597 int len = from_cp->operands()->length();
1598 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1599 Copy::conjoint_memory_atomic(
1600 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1601 to_cp->set_operands(new_ops);
1602 } else {
1603 int old_len = to_cp->operands()->length();
1604 int from_len = from_cp->operands()->length();
1605 int old_off = old_oplen * sizeof(u2);
1606 int from_off = from_oplen * sizeof(u2);
1607 // Use the metaspace for the destination constant pool
1608 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1609 int fillp = 0, len = 0;
1610 // first part of dest
1611 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1612 new_operands->adr_at(fillp),
1613 (len = old_off) * sizeof(u2));
1614 fillp += len;
1615 // first part of src
1616 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1617 new_operands->adr_at(fillp),
1618 (len = from_off) * sizeof(u2));
1619 fillp += len;
1620 // second part of dest
1621 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1622 new_operands->adr_at(fillp),
1623 (len = old_len - old_off) * sizeof(u2));
1624 fillp += len;
1625 // second part of src
1626 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1627 new_operands->adr_at(fillp),
1628 (len = from_len - from_off) * sizeof(u2));
1629 fillp += len;
1630 assert(fillp == new_operands->length(), "");
1631
1632 // Adjust indexes in the first part of the copied operands array.
1633 for (int j = 0; j < from_oplen; j++) {
1634 int offset = operand_offset_at(new_operands, old_oplen + j);
1635 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1636 offset += old_len; // every new tuple is preceded by old_len extra u2's
1637 operand_offset_at_put(new_operands, old_oplen + j, offset);
1638 }
1639
1640 // replace target operands array with combined array
1641 to_cp->set_operands(new_operands);
1642 }
1643 }
1644 } // end copy_operands()
1645
1646
1647 // Copy this constant pool's entries at start_i to end_i (inclusive)
1648 // to the constant pool to_cp's entries starting at to_i. A total of
1649 // (end_i - start_i) + 1 entries are copied.
1650 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1651 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1652
1653
1654 int dest_i = to_i; // leave original alone for debug purposes
1655
1656 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1657 copy_entry_to(from_cp, src_i, to_cp, dest_i);
1658
1659 switch (from_cp->tag_at(src_i).value()) {
1660 case JVM_CONSTANT_Double:
1661 case JVM_CONSTANT_Long:
1662 // double and long take two constant pool entries
1663 src_i += 2;
1664 dest_i += 2;
1665 break;
1666
1667 default:
1668 // all others take one constant pool entry
1669 src_i++;
1670 dest_i++;
1671 break;
1672 }
1673 }
1674 copy_operands(from_cp, to_cp, CHECK);
1675
1676 } // end copy_cp_to_impl()
1677
1678
1679 // Copy this constant pool's entry at from_i to the constant pool
1680 // to_cp's entry at to_i.
1681 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1682 const constantPoolHandle& to_cp, int to_i) {
1683
1684 int tag = from_cp->tag_at(from_i).value();
1685 switch (tag) {
1686 case JVM_CONSTANT_ClassIndex:
1687 {
1688 jint ki = from_cp->klass_index_at(from_i);
1689 to_cp->klass_index_at_put(to_i, ki);
1690 } break;
1691
1692 case JVM_CONSTANT_Double:
1693 {
1694 jdouble d = from_cp->double_at(from_i);
1695 to_cp->double_at_put(to_i, d);
1696 // double takes two constant pool entries so init second entry's tag
1697 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1698 } break;
1699
1700 case JVM_CONSTANT_Fieldref:
1701 {
1702 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1703 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1704 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1705 } break;
1706
1707 case JVM_CONSTANT_Float:
1708 {
1709 jfloat f = from_cp->float_at(from_i);
1710 to_cp->float_at_put(to_i, f);
1711 } break;
1712
1713 case JVM_CONSTANT_Integer:
1714 {
1715 jint i = from_cp->int_at(from_i);
1716 to_cp->int_at_put(to_i, i);
1717 } break;
1718
1719 case JVM_CONSTANT_InterfaceMethodref:
1720 {
1721 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1722 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1723 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1724 } break;
1725
1726 case JVM_CONSTANT_Long:
1727 {
1728 jlong l = from_cp->long_at(from_i);
1729 to_cp->long_at_put(to_i, l);
1730 // long takes two constant pool entries so init second entry's tag
1731 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1732 } break;
1733
1734 case JVM_CONSTANT_Methodref:
1735 {
1736 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1737 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1738 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1739 } break;
1740
1741 case JVM_CONSTANT_NameAndType:
1742 {
1743 int name_ref_index = from_cp->name_ref_index_at(from_i);
1744 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1745 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1746 } break;
1747
1748 case JVM_CONSTANT_StringIndex:
1749 {
1750 jint si = from_cp->string_index_at(from_i);
1751 to_cp->string_index_at_put(to_i, si);
1752 } break;
1753
1754 case JVM_CONSTANT_Class:
1755 case JVM_CONSTANT_UnresolvedClass:
1756 case JVM_CONSTANT_UnresolvedClassInError:
1757 {
1758 // Revert to JVM_CONSTANT_ClassIndex
1759 int name_index = from_cp->klass_slot_at(from_i).name_index();
1760 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1761 to_cp->klass_index_at_put(to_i, name_index);
1762 } break;
1763
1764 case JVM_CONSTANT_String:
1765 {
1766 Symbol* s = from_cp->unresolved_string_at(from_i);
1767 to_cp->unresolved_string_at_put(to_i, s);
1768 } break;
1769
1770 case JVM_CONSTANT_Utf8:
1771 {
1772 Symbol* s = from_cp->symbol_at(from_i);
1773 // Need to increase refcount, the old one will be thrown away and deferenced
1774 s->increment_refcount();
1775 to_cp->symbol_at_put(to_i, s);
1776 } break;
1777
1778 case JVM_CONSTANT_MethodType:
1779 case JVM_CONSTANT_MethodTypeInError:
1780 {
1781 jint k = from_cp->method_type_index_at(from_i);
1782 to_cp->method_type_index_at_put(to_i, k);
1783 } break;
1784
1785 case JVM_CONSTANT_MethodHandle:
1786 case JVM_CONSTANT_MethodHandleInError:
1787 {
1788 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1789 int k2 = from_cp->method_handle_index_at(from_i);
1790 to_cp->method_handle_index_at_put(to_i, k1, k2);
1791 } break;
1792
1793 case JVM_CONSTANT_Dynamic:
1794 case JVM_CONSTANT_DynamicInError:
1795 {
1796 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1797 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1798 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1799 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1800 } break;
1801
1802 case JVM_CONSTANT_InvokeDynamic:
1803 {
1804 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1805 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1806 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1807 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1808 } break;
1809
1810 // Invalid is used as the tag for the second constant pool entry
1811 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1812 // not be seen by itself.
1813 case JVM_CONSTANT_Invalid: // fall through
1814
1815 default:
1816 {
1817 ShouldNotReachHere();
1818 } break;
1819 }
1820 } // end copy_entry_to()
1821
1822 // Search constant pool search_cp for an entry that matches this
1823 // constant pool's entry at pattern_i. Returns the index of a
1824 // matching entry or zero (0) if there is no matching entry.
1825 int ConstantPool::find_matching_entry(int pattern_i,
1826 const constantPoolHandle& search_cp) {
1827
1828 // index zero (0) is not used
1829 for (int i = 1; i < search_cp->length(); i++) {
1830 bool found = compare_entry_to(pattern_i, search_cp, i);
1831 if (found) {
1832 return i;
1833 }
1834 }
1835
1836 return 0; // entry not found; return unused index zero (0)
1837 } // end find_matching_entry()
1838
1839
1840 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1841 // cp2's bootstrap specifier at idx2.
1842 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2) {
1843 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1844 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1845 bool match = compare_entry_to(k1, cp2, k2);
1846
1847 if (!match) {
1848 return false;
1849 }
1850 int argc = operand_argument_count_at(idx1);
1851 if (argc == cp2->operand_argument_count_at(idx2)) {
1852 for (int j = 0; j < argc; j++) {
1853 k1 = operand_argument_index_at(idx1, j);
1854 k2 = cp2->operand_argument_index_at(idx2, j);
1855 match = compare_entry_to(k1, cp2, k2);
1856 if (!match) {
1857 return false;
1858 }
1859 }
1860 return true; // got through loop; all elements equal
1861 }
1862 return false;
1863 } // end compare_operand_to()
1864
1865 // Search constant pool search_cp for a bootstrap specifier that matches
1866 // this constant pool's bootstrap specifier data at pattern_i index.
1867 // Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1868 int ConstantPool::find_matching_operand(int pattern_i,
1869 const constantPoolHandle& search_cp, int search_len) {
1870 for (int i = 0; i < search_len; i++) {
1871 bool found = compare_operand_to(pattern_i, search_cp, i);
1872 if (found) {
1873 return i;
1874 }
1875 }
1876 return -1; // bootstrap specifier data not found; return unused index (-1)
1877 } // end find_matching_operand()
1878
1879
1880 #ifndef PRODUCT
1881
1882 const char* ConstantPool::printable_name_at(int which) {
1883
1884 constantTag tag = tag_at(which);
1885
1886 if (tag.is_string()) {
1887 return string_at_noresolve(which);
1888 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1889 return klass_name_at(which)->as_C_string();
1890 } else if (tag.is_symbol()) {
1891 return symbol_at(which)->as_C_string();
1892 }
1893 return "";
1894 }
1895
1896 #endif // PRODUCT
1897
1898
1899 // JVMTI GetConstantPool support
1900
1901 // For debugging of constant pool
1902 const bool debug_cpool = false;
1903
1904 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1905
1906 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1907 const char* WARN_MSG = "Must not be such entry!";
1908 jint size = 0;
1909 u2 idx1, idx2;
1910
1911 for (jint idx = 1; idx < cnt; idx++) {
1912 jint ent_size = 0;
1913 u1 tag = *bytes++;
1914 size++; // count tag
1915
1916 printf("const #%03d, tag: %02d ", idx, tag);
1917 switch(tag) {
1918 case JVM_CONSTANT_Invalid: {
1919 printf("Invalid");
1920 break;
1921 }
1922 case JVM_CONSTANT_Unicode: {
1923 printf("Unicode %s", WARN_MSG);
1924 break;
1925 }
1926 case JVM_CONSTANT_Utf8: {
1927 u2 len = Bytes::get_Java_u2(bytes);
1928 char str[128];
1929 if (len > 127) {
1930 len = 127;
1931 }
1932 strncpy(str, (char *) (bytes+2), len);
1933 str[len] = '\0';
1934 printf("Utf8 \"%s\"", str);
1935 ent_size = 2 + len;
1936 break;
1937 }
1938 case JVM_CONSTANT_Integer: {
1939 u4 val = Bytes::get_Java_u4(bytes);
1940 printf("int %d", *(int *) &val);
1941 ent_size = 4;
1942 break;
1943 }
1944 case JVM_CONSTANT_Float: {
1945 u4 val = Bytes::get_Java_u4(bytes);
1946 printf("float %5.3ff", *(float *) &val);
1947 ent_size = 4;
1948 break;
1949 }
1950 case JVM_CONSTANT_Long: {
1951 u8 val = Bytes::get_Java_u8(bytes);
1952 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1953 ent_size = 8;
1954 idx++; // Long takes two cpool slots
1955 break;
1956 }
1957 case JVM_CONSTANT_Double: {
1958 u8 val = Bytes::get_Java_u8(bytes);
1959 printf("double %5.3fd", *(jdouble *)&val);
1960 ent_size = 8;
1961 idx++; // Double takes two cpool slots
1962 break;
1963 }
1964 case JVM_CONSTANT_Class: {
1965 idx1 = Bytes::get_Java_u2(bytes);
1966 printf("class #%03d", idx1);
1967 ent_size = 2;
1968 break;
1969 }
1970 case (JVM_CONSTANT_Class | JVM_CONSTANT_QDescBit): {
1971 idx1 = Bytes::get_Java_u2(bytes);
1972 printf("qclass #%03d", idx1);
1973 ent_size = 2;
1974 break;
1975 }
1976 case JVM_CONSTANT_String: {
1977 idx1 = Bytes::get_Java_u2(bytes);
1978 printf("String #%03d", idx1);
1979 ent_size = 2;
1980 break;
1981 }
1982 case JVM_CONSTANT_Fieldref: {
1983 idx1 = Bytes::get_Java_u2(bytes);
1984 idx2 = Bytes::get_Java_u2(bytes+2);
1985 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1986 ent_size = 4;
1987 break;
1988 }
1989 case JVM_CONSTANT_Methodref: {
1990 idx1 = Bytes::get_Java_u2(bytes);
1991 idx2 = Bytes::get_Java_u2(bytes+2);
1992 printf("Method #%03d, #%03d", idx1, idx2);
1993 ent_size = 4;
1994 break;
1995 }
1996 case JVM_CONSTANT_InterfaceMethodref: {
1997 idx1 = Bytes::get_Java_u2(bytes);
1998 idx2 = Bytes::get_Java_u2(bytes+2);
1999 printf("InterfMethod #%03d, #%03d", idx1, idx2);
2000 ent_size = 4;
2001 break;
2002 }
2003 case JVM_CONSTANT_NameAndType: {
2004 idx1 = Bytes::get_Java_u2(bytes);
2005 idx2 = Bytes::get_Java_u2(bytes+2);
2006 printf("NameAndType #%03d, #%03d", idx1, idx2);
2007 ent_size = 4;
2008 break;
2009 }
2010 case JVM_CONSTANT_ClassIndex: {
2011 printf("ClassIndex %s", WARN_MSG);
2012 break;
2013 }
2014 case JVM_CONSTANT_UnresolvedClass: {
2015 printf("UnresolvedClass: %s", WARN_MSG);
2016 break;
2017 }
2018 case (JVM_CONSTANT_UnresolvedClass | JVM_CONSTANT_QDescBit): {
2019 printf("UnresolvedQClass: %s", WARN_MSG);
2020 break;
2021 }
2022 case JVM_CONSTANT_UnresolvedClassInError: {
2023 printf("UnresolvedClassInErr: %s", WARN_MSG);
2024 break;
2025 }
2026 case JVM_CONSTANT_StringIndex: {
2027 printf("StringIndex: %s", WARN_MSG);
2028 break;
2029 }
2030 }
2031 printf(";\n");
2032 bytes += ent_size;
2033 size += ent_size;
2034 }
2035 printf("Cpool size: %d\n", size);
2036 fflush(0);
2037 return;
2038 } /* end print_cpool_bytes */
2039
2040
2041 // Returns size of constant pool entry.
2042 jint ConstantPool::cpool_entry_size(jint idx) {
2043 switch(tag_at(idx).value()) {
2044 case JVM_CONSTANT_Invalid:
2045 case JVM_CONSTANT_Unicode:
2046 return 1;
2047
2048 case JVM_CONSTANT_Utf8:
2049 return 3 + symbol_at(idx)->utf8_length();
2050
2051 case JVM_CONSTANT_Class:
2052 case JVM_CONSTANT_String:
2053 case JVM_CONSTANT_ClassIndex:
2054 case JVM_CONSTANT_UnresolvedClass:
2055 case JVM_CONSTANT_UnresolvedClassInError:
2056 case JVM_CONSTANT_StringIndex:
2057 case JVM_CONSTANT_MethodType:
2058 case JVM_CONSTANT_MethodTypeInError:
2059 return 3;
2060
2061 case JVM_CONSTANT_MethodHandle:
2062 case JVM_CONSTANT_MethodHandleInError:
2063 return 4; //tag, ref_kind, ref_index
2064
2065 case JVM_CONSTANT_Integer:
2066 case JVM_CONSTANT_Float:
2067 case JVM_CONSTANT_Fieldref:
2068 case JVM_CONSTANT_Methodref:
2069 case JVM_CONSTANT_InterfaceMethodref:
2070 case JVM_CONSTANT_NameAndType:
2071 return 5;
2072
2073 case JVM_CONSTANT_Dynamic:
2074 case JVM_CONSTANT_DynamicInError:
2075 case JVM_CONSTANT_InvokeDynamic:
2076 // u1 tag, u2 bsm, u2 nt
2077 return 5;
2078
2079 case JVM_CONSTANT_Long:
2080 case JVM_CONSTANT_Double:
2081 return 9;
2082 }
2083 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
2084 return 1;
2085 } /* end cpool_entry_size */
2086
2087
2088 // SymbolHash is used to find a constant pool index from a string.
2089 // This function fills in SymbolHashs, one for utf8s and one for
2090 // class names, returns size of the cpool raw bytes.
2091 jint ConstantPool::hash_entries_to(SymbolHash *symmap,
2092 SymbolHash *classmap) {
2093 jint size = 0;
2094
2095 for (u2 idx = 1; idx < length(); idx++) {
2096 u2 tag = tag_at(idx).value();
2097 size += cpool_entry_size(idx);
2098
2099 switch(tag) {
2100 case JVM_CONSTANT_Utf8: {
2101 Symbol* sym = symbol_at(idx);
2102 symmap->add_if_absent(sym, idx);
2103 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
2104 break;
2105 }
2106 case JVM_CONSTANT_Class:
2107 case JVM_CONSTANT_UnresolvedClass:
2108 case JVM_CONSTANT_UnresolvedClassInError: {
2109 Symbol* sym = klass_name_at(idx);
2110 classmap->add_if_absent(sym, idx);
2111 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
2112 break;
2113 }
2114 case JVM_CONSTANT_Long:
2115 case JVM_CONSTANT_Double: {
2116 idx++; // Both Long and Double take two cpool slots
2117 break;
2118 }
2119 }
2120 }
2121 return size;
2122 } /* end hash_utf8_entries_to */
2123
2124
2125 // Copy cpool bytes.
2126 // Returns:
2127 // 0, in case of OutOfMemoryError
2128 // -1, in case of internal error
2129 // > 0, count of the raw cpool bytes that have been copied
2130 int ConstantPool::copy_cpool_bytes(int cpool_size,
2131 SymbolHash* tbl,
2132 unsigned char *bytes) {
2133 u2 idx1, idx2;
2134 jint size = 0;
2135 jint cnt = length();
2136 unsigned char *start_bytes = bytes;
2137
2138 for (jint idx = 1; idx < cnt; idx++) {
2139 u1 tag = tag_at(idx).value();
2140 jint ent_size = cpool_entry_size(idx);
2141
2142 assert(size + ent_size <= cpool_size, "Size mismatch");
2143
2144 *bytes = tag;
2145 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2146 switch(tag) {
2147 case JVM_CONSTANT_Invalid: {
2148 DBG(printf("JVM_CONSTANT_Invalid"));
2149 break;
2150 }
2151 case JVM_CONSTANT_Unicode: {
2152 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2153 DBG(printf("JVM_CONSTANT_Unicode"));
2154 break;
2155 }
2156 case JVM_CONSTANT_Utf8: {
2157 Symbol* sym = symbol_at(idx);
2158 char* str = sym->as_utf8();
2159 // Warning! It's crashing on x86 with len = sym->utf8_length()
2160 int len = (int) strlen(str);
2161 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2162 for (int i = 0; i < len; i++) {
2163 bytes[3+i] = (u1) str[i];
2164 }
2165 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2166 break;
2167 }
2168 case JVM_CONSTANT_Integer: {
2169 jint val = int_at(idx);
2170 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2171 break;
2172 }
2173 case JVM_CONSTANT_Float: {
2174 jfloat val = float_at(idx);
2175 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2176 break;
2177 }
2178 case JVM_CONSTANT_Long: {
2179 jlong val = long_at(idx);
2180 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2181 idx++; // Long takes two cpool slots
2182 break;
2183 }
2184 case JVM_CONSTANT_Double: {
2185 jdouble val = double_at(idx);
2186 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2187 idx++; // Double takes two cpool slots
2188 break;
2189 }
2190 case JVM_CONSTANT_Class:
2191 case JVM_CONSTANT_UnresolvedClass:
2192 case JVM_CONSTANT_UnresolvedClassInError: {
2193 *bytes = JVM_CONSTANT_Class;
2194 Symbol* sym = klass_name_at(idx);
2195 idx1 = tbl->symbol_to_value(sym);
2196 assert(idx1 != 0, "Have not found a hashtable entry");
2197 Bytes::put_Java_u2((address) (bytes+1), idx1);
2198 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2199 break;
2200 }
2201 case JVM_CONSTANT_String: {
2202 *bytes = JVM_CONSTANT_String;
2203 Symbol* sym = unresolved_string_at(idx);
2204 idx1 = tbl->symbol_to_value(sym);
2205 assert(idx1 != 0, "Have not found a hashtable entry");
2206 Bytes::put_Java_u2((address) (bytes+1), idx1);
2207 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2208 break;
2209 }
2210 case JVM_CONSTANT_Fieldref:
2211 case JVM_CONSTANT_Methodref:
2212 case JVM_CONSTANT_InterfaceMethodref: {
2213 idx1 = uncached_klass_ref_index_at(idx);
2214 idx2 = uncached_name_and_type_ref_index_at(idx);
2215 Bytes::put_Java_u2((address) (bytes+1), idx1);
2216 Bytes::put_Java_u2((address) (bytes+3), idx2);
2217 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2218 break;
2219 }
2220 case JVM_CONSTANT_NameAndType: {
2221 idx1 = name_ref_index_at(idx);
2222 idx2 = signature_ref_index_at(idx);
2223 Bytes::put_Java_u2((address) (bytes+1), idx1);
2224 Bytes::put_Java_u2((address) (bytes+3), idx2);
2225 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2226 break;
2227 }
2228 case JVM_CONSTANT_ClassIndex: {
2229 *bytes = JVM_CONSTANT_Class;
2230 idx1 = klass_index_at(idx);
2231 Bytes::put_Java_u2((address) (bytes+1), idx1);
2232 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2233 break;
2234 }
2235 case JVM_CONSTANT_StringIndex: {
2236 *bytes = JVM_CONSTANT_String;
2237 idx1 = string_index_at(idx);
2238 Bytes::put_Java_u2((address) (bytes+1), idx1);
2239 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2240 break;
2241 }
2242 case JVM_CONSTANT_MethodHandle:
2243 case JVM_CONSTANT_MethodHandleInError: {
2244 *bytes = JVM_CONSTANT_MethodHandle;
2245 int kind = method_handle_ref_kind_at(idx);
2246 idx1 = method_handle_index_at(idx);
2247 *(bytes+1) = (unsigned char) kind;
2248 Bytes::put_Java_u2((address) (bytes+2), idx1);
2249 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2250 break;
2251 }
2252 case JVM_CONSTANT_MethodType:
2253 case JVM_CONSTANT_MethodTypeInError: {
2254 *bytes = JVM_CONSTANT_MethodType;
2255 idx1 = method_type_index_at(idx);
2256 Bytes::put_Java_u2((address) (bytes+1), idx1);
2257 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2258 break;
2259 }
2260 case JVM_CONSTANT_Dynamic:
2261 case JVM_CONSTANT_DynamicInError: {
2262 *bytes = tag;
2263 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2264 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2265 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2266 Bytes::put_Java_u2((address) (bytes+1), idx1);
2267 Bytes::put_Java_u2((address) (bytes+3), idx2);
2268 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2269 break;
2270 }
2271 case JVM_CONSTANT_InvokeDynamic: {
2272 *bytes = tag;
2273 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2274 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2275 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2276 Bytes::put_Java_u2((address) (bytes+1), idx1);
2277 Bytes::put_Java_u2((address) (bytes+3), idx2);
2278 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2279 break;
2280 }
2281 }
2282 DBG(printf("\n"));
2283 bytes += ent_size;
2284 size += ent_size;
2285 }
2286 assert(size == cpool_size, "Size mismatch");
2287
2288 // Keep temporarily for debugging until it's stable.
2289 DBG(print_cpool_bytes(cnt, start_bytes));
2290 return (int)(bytes - start_bytes);
2291 } /* end copy_cpool_bytes */
2292
2293 #undef DBG
2294
2295 bool ConstantPool::is_maybe_on_stack() const {
2296 // This method uses the similar logic as nmethod::is_maybe_on_stack()
2297 if (!Continuations::enabled()) {
2298 return false;
2299 }
2300
2301 // If the condition below is true, it means that the nmethod was found to
2302 // be alive the previous completed marking cycle.
2303 return cache()->gc_epoch() >= CodeCache::previous_completed_gc_marking_cycle();
2304 }
2305
2306 // For redefinition, if any methods found in loom stack chunks, the gc_epoch is
2307 // recorded in their constant pool cache. The on_stack-ness of the constant pool controls whether
2308 // memory for the method is reclaimed.
2309 bool ConstantPool::on_stack() const {
2310 if ((_flags &_on_stack) != 0) {
2311 return true;
2312 }
2313
2314 if (_cache == nullptr) {
2315 return false;
2316 }
2317
2318 return is_maybe_on_stack();
2319 }
2320
2321 void ConstantPool::set_on_stack(const bool value) {
2322 if (value) {
2323 // Only record if it's not already set.
2324 if (!on_stack()) {
2325 assert(!is_shared(), "should always be set for shared constant pools");
2326 _flags |= _on_stack;
2327 MetadataOnStackMark::record(this);
2328 }
2329 } else {
2330 // Clearing is done single-threadedly.
2331 if (!is_shared()) {
2332 _flags &= ~_on_stack;
2333 }
2334 }
2335 }
2336
2337 // Printing
2338
2339 void ConstantPool::print_on(outputStream* st) const {
2340 assert(is_constantPool(), "must be constantPool");
2341 st->print_cr("%s", internal_name());
2342 if (flags() != 0) {
2343 st->print(" - flags: 0x%x", flags());
2344 if (has_preresolution()) st->print(" has_preresolution");
2345 if (on_stack()) st->print(" on_stack");
2346 st->cr();
2347 }
2348 if (pool_holder() != NULL) {
2349 st->print_cr(" - holder: " PTR_FORMAT, p2i(pool_holder()));
2350 }
2351 st->print_cr(" - cache: " PTR_FORMAT, p2i(cache()));
2352 st->print_cr(" - resolved_references: " PTR_FORMAT, p2i(resolved_references_or_null()));
2353 st->print_cr(" - reference_map: " PTR_FORMAT, p2i(reference_map()));
2354 st->print_cr(" - resolved_klasses: " PTR_FORMAT, p2i(resolved_klasses()));
2355 st->print_cr(" - cp length: %d", length());
2356
2357 for (int index = 1; index < length(); index++) { // Index 0 is unused
2358 ((ConstantPool*)this)->print_entry_on(index, st);
2359 switch (tag_at(index).value()) {
2360 case JVM_CONSTANT_Long :
2361 case JVM_CONSTANT_Double :
2362 index++; // Skip entry following eigth-byte constant
2363 }
2364
2365 }
2366 st->cr();
2367 }
2368
2369 // Print one constant pool entry
2370 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2371 EXCEPTION_MARK;
2372 st->print(" - %3d : ", index);
2373 tag_at(index).print_on(st);
2374 st->print(" : ");
2375 switch (tag_at(index).value()) {
2376 case JVM_CONSTANT_Class :
2377 { Klass* k = klass_at(index, CATCH);
2378 guarantee(k != NULL, "need klass");
2379 k->print_value_on(st);
2380 st->print(" {" PTR_FORMAT "}", p2i(k));
2381 }
2382 break;
2383 case JVM_CONSTANT_Fieldref :
2384 case JVM_CONSTANT_Methodref :
2385 case JVM_CONSTANT_InterfaceMethodref :
2386 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2387 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2388 break;
2389 case JVM_CONSTANT_String :
2390 unresolved_string_at(index)->print_value_on(st);
2391 break;
2392 case JVM_CONSTANT_Integer :
2393 st->print("%d", int_at(index));
2394 break;
2395 case JVM_CONSTANT_Float :
2396 st->print("%f", float_at(index));
2397 break;
2398 case JVM_CONSTANT_Long :
2399 st->print_jlong(long_at(index));
2400 break;
2401 case JVM_CONSTANT_Double :
2402 st->print("%lf", double_at(index));
2403 break;
2404 case JVM_CONSTANT_NameAndType :
2405 st->print("name_index=%d", name_ref_index_at(index));
2406 st->print(" signature_index=%d", signature_ref_index_at(index));
2407 break;
2408 case JVM_CONSTANT_Utf8 :
2409 symbol_at(index)->print_value_on(st);
2410 break;
2411 case JVM_CONSTANT_ClassIndex: {
2412 int name_index = *int_at_addr(index);
2413 st->print("klass_index=%d ", name_index);
2414 symbol_at(name_index)->print_value_on(st);
2415 }
2416 break;
2417 case JVM_CONSTANT_UnresolvedClass : // fall-through
2418 case JVM_CONSTANT_UnresolvedClassInError: {
2419 CPKlassSlot kslot = klass_slot_at(index);
2420 int resolved_klass_index = kslot.resolved_klass_index();
2421 int name_index = kslot.name_index();
2422 assert(tag_at(name_index).is_symbol(), "sanity");
2423 symbol_at(name_index)->print_value_on(st);
2424 }
2425 break;
2426 case JVM_CONSTANT_MethodHandle :
2427 case JVM_CONSTANT_MethodHandleInError :
2428 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2429 st->print(" ref_index=%d", method_handle_index_at(index));
2430 break;
2431 case JVM_CONSTANT_MethodType :
2432 case JVM_CONSTANT_MethodTypeInError :
2433 st->print("signature_index=%d", method_type_index_at(index));
2434 break;
2435 case JVM_CONSTANT_Dynamic :
2436 case JVM_CONSTANT_DynamicInError :
2437 {
2438 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2439 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2440 int argc = bootstrap_argument_count_at(index);
2441 if (argc > 0) {
2442 for (int arg_i = 0; arg_i < argc; arg_i++) {
2443 int arg = bootstrap_argument_index_at(index, arg_i);
2444 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2445 }
2446 st->print("}");
2447 }
2448 }
2449 break;
2450 case JVM_CONSTANT_InvokeDynamic :
2451 {
2452 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2453 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2454 int argc = bootstrap_argument_count_at(index);
2455 if (argc > 0) {
2456 for (int arg_i = 0; arg_i < argc; arg_i++) {
2457 int arg = bootstrap_argument_index_at(index, arg_i);
2458 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2459 }
2460 st->print("}");
2461 }
2462 }
2463 break;
2464 default:
2465 ShouldNotReachHere();
2466 break;
2467 }
2468 st->cr();
2469 }
2470
2471 void ConstantPool::print_value_on(outputStream* st) const {
2472 assert(is_constantPool(), "must be constantPool");
2473 st->print("constant pool [%d]", length());
2474 if (has_preresolution()) st->print("/preresolution");
2475 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2476 print_address_on(st);
2477 if (pool_holder() != NULL) {
2478 st->print(" for ");
2479 pool_holder()->print_value_on(st);
2480 bool extra = (pool_holder()->constants() != this);
2481 if (extra) st->print(" (extra)");
2482 }
2483 if (cache() != NULL) {
2484 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2485 }
2486 }
2487
2488 // Verification
2489
2490 void ConstantPool::verify_on(outputStream* st) {
2491 guarantee(is_constantPool(), "object must be constant pool");
2492 for (int i = 0; i< length(); i++) {
2493 constantTag tag = tag_at(i);
2494 if (tag.is_klass() || tag.is_unresolved_klass()) {
2495 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2496 } else if (tag.is_symbol()) {
2497 Symbol* entry = symbol_at(i);
2498 guarantee(entry->refcount() != 0, "should have nonzero reference count");
2499 } else if (tag.is_string()) {
2500 Symbol* entry = unresolved_string_at(i);
2501 guarantee(entry->refcount() != 0, "should have nonzero reference count");
2502 }
2503 }
2504 if (pool_holder() != NULL) {
2505 // Note: pool_holder() can be NULL in temporary constant pools
2506 // used during constant pool merging
2507 guarantee(pool_holder()->is_klass(), "should be klass");
2508 }
2509 }