1 /*
2 * Copyright (c) 1997, 2021, 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/heapShared.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/javaClasses.inline.hpp"
30 #include "classfile/metadataOnStackMark.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmClasses.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "interpreter/bootstrapInfo.hpp"
36 #include "interpreter/linkResolver.hpp"
37 #include "logging/log.hpp"
38 #include "logging/logStream.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/metadataFactory.hpp"
41 #include "memory/metaspaceClosure.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "memory/universe.hpp"
45 #include "oops/array.hpp"
46 #include "oops/constantPool.inline.hpp"
47 #include "oops/cpCache.inline.hpp"
48 #include "oops/flatArrayKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/klass.inline.hpp"
51 #include "oops/objArrayKlass.hpp"
52 #include "oops/objArrayOop.inline.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "oops/typeArrayOop.inline.hpp"
55 #include "prims/jvmtiExport.hpp"
56 #include "runtime/atomic.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/init.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/signature.hpp"
61 #include "runtime/thread.inline.hpp"
62 #include "runtime/vframe.inline.hpp"
63 #include "utilities/copy.hpp"
64
65 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
66 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
67 int size = ConstantPool::size(length);
68 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
69 }
70
71 void ConstantPool::copy_fields(const ConstantPool* orig) {
72 // Preserve dynamic constant information from the original pool
73 if (orig->has_dynamic_constant()) {
74 set_has_dynamic_constant();
75 }
76
77 set_major_version(orig->major_version());
78 set_minor_version(orig->minor_version());
79
80 set_source_file_name_index(orig->source_file_name_index());
81 set_generic_signature_index(orig->generic_signature_index());
82 }
83
84 #ifdef ASSERT
85
86 // MetaspaceObj allocation invariant is calloc equivalent memory
87 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
88 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
89 assert(tags != NULL, "invariant");
90 const int length = tags->length();
91 for (int index = 0; index < length; ++index) {
92 if (JVM_CONSTANT_Invalid != tags->at(index)) {
93 return false;
94 }
95 }
96 return true;
97 }
98
99 #endif
100
101 ConstantPool::ConstantPool(Array<u1>* tags) :
102 _tags(tags),
103 _length(tags->length()) {
104
105 assert(_tags != NULL, "invariant");
106 assert(tags->length() == _length, "invariant");
107 assert(tag_array_is_zero_initialized(tags), "invariant");
108 assert(0 == flags(), "invariant");
109 assert(0 == version(), "invariant");
110 assert(NULL == _pool_holder, "invariant");
111 }
112
113 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
114 if (cache() != NULL) {
115 MetadataFactory::free_metadata(loader_data, cache());
116 set_cache(NULL);
117 }
118
119 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
120 set_resolved_klasses(NULL);
121
122 MetadataFactory::free_array<jushort>(loader_data, operands());
123 set_operands(NULL);
124
125 release_C_heap_structures();
126
127 // free tag array
128 MetadataFactory::free_array<u1>(loader_data, tags());
129 set_tags(NULL);
130 }
131
132 void ConstantPool::release_C_heap_structures() {
133 // walk constant pool and decrement symbol reference counts
134 unreference_symbols();
135 }
136
137 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
138 log_trace(cds)("Iter(ConstantPool): %p", this);
139
140 it->push(&_tags, MetaspaceClosure::_writable);
141 it->push(&_cache);
142 it->push(&_pool_holder);
143 it->push(&_operands);
144 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
145
146 for (int i = 0; i < length(); i++) {
147 // The only MSO's embedded in the CP entries are Symbols:
148 // JVM_CONSTANT_String (normal and pseudo)
149 // JVM_CONSTANT_Utf8
150 constantTag ctag = tag_at(i);
151 if (ctag.is_string() || ctag.is_utf8()) {
152 it->push(symbol_at_addr(i));
153 }
154 }
155 }
156
157 objArrayOop ConstantPool::resolved_references() const {
158 return (objArrayOop)_cache->resolved_references();
159 }
160
161 // Called from outside constant pool resolution where a resolved_reference array
162 // may not be present.
163 objArrayOop ConstantPool::resolved_references_or_null() const {
164 if (_cache == NULL) {
165 return NULL;
166 } else {
167 return (objArrayOop)_cache->resolved_references();
168 }
169 }
170
171 // Create resolved_references array and mapping array for original cp indexes
172 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
173 // to map it back for resolving and some unlikely miscellaneous uses.
174 // The objects created by invokedynamic are appended to this list.
175 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
176 const intStack& reference_map,
177 int constant_pool_map_length,
178 TRAPS) {
179 // Initialized the resolved object cache.
180 int map_length = reference_map.length();
181 if (map_length > 0) {
182 // Only need mapping back to constant pool entries. The map isn't used for
183 // invokedynamic resolved_reference entries. For invokedynamic entries,
184 // the constant pool cache index has the mapping back to both the constant
185 // pool and to the resolved reference index.
186 if (constant_pool_map_length > 0) {
187 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
188
189 for (int i = 0; i < constant_pool_map_length; i++) {
190 int x = reference_map.at(i);
191 assert(x == (int)(jushort) x, "klass index is too big");
192 om->at_put(i, (jushort)x);
193 }
194 set_reference_map(om);
195 }
196
197 // Create Java array for holding resolved strings, methodHandles,
198 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
199 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK);
200 Handle refs_handle (THREAD, stom); // must handleize.
201 set_resolved_references(loader_data->add_handle(refs_handle));
202 }
203 }
204
205 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
206 // A ConstantPool can't possibly have 0xffff valid class entries,
207 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
208 // entry for the class's name. So at most we will have 0xfffe class entries.
209 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
210 // UnresolvedKlass entries that are temporarily created during class redefinition.
211 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
212 assert(resolved_klasses() == NULL, "sanity");
213 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
214 set_resolved_klasses(rk);
215 }
216
217 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
218 int len = length();
219 int num_klasses = 0;
220 for (int i = 1; i <len; i++) {
221 switch (tag_at(i).value()) {
222 case JVM_CONSTANT_ClassIndex:
223 {
224 const int class_index = klass_index_at(i);
225 unresolved_klass_at_put(i, class_index, num_klasses++);
226 }
227 break;
228 #ifndef PRODUCT
229 case JVM_CONSTANT_Class:
230 case JVM_CONSTANT_UnresolvedClass:
231 case JVM_CONSTANT_UnresolvedClassInError:
232 // All of these should have been reverted back to Unresolved before calling
233 // this function.
234 ShouldNotReachHere();
235 #endif
236 }
237 }
238 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
239 }
240
241 // Hidden class support:
242 void ConstantPool::klass_at_put(int class_index, Klass* k) {
243 assert(k != NULL, "must be valid klass");
244 CPKlassSlot kslot = klass_slot_at(class_index);
245 int resolved_klass_index = kslot.resolved_klass_index();
246 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
247 Atomic::release_store(adr, k);
248
249 // The interpreter assumes when the tag is stored, the klass is resolved
250 // and the Klass* non-NULL, so we need hardware store ordering here.
251 assert(!k->name()->is_Q_signature(), "Q-type without JVM_CONSTANT_QDescBit");
252 release_tag_at_put(class_index, JVM_CONSTANT_Class);
253 }
254
255 #if INCLUDE_CDS_JAVA_HEAP
256 // Archive the resolved references
257 void ConstantPool::archive_resolved_references() {
258 if (_cache == NULL) {
259 return; // nothing to do
260 }
261
262 InstanceKlass *ik = pool_holder();
263 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() ||
264 ik->is_shared_app_class())) {
265 // Archiving resolved references for classes from non-builtin loaders
266 // is not yet supported.
267 return;
268 }
269
270 objArrayOop rr = resolved_references();
271 Array<u2>* ref_map = reference_map();
272 if (rr != NULL) {
273 int ref_map_len = ref_map == NULL ? 0 : ref_map->length();
274 int rr_len = rr->length();
275 for (int i = 0; i < rr_len; i++) {
276 oop obj = rr->obj_at(i);
277 rr->obj_at_put(i, NULL);
278 if (obj != NULL && i < ref_map_len) {
279 int index = object_to_cp_index(i);
280 if (tag_at(index).is_string()) {
281 oop archived_string = HeapShared::find_archived_heap_object(obj);
282 // Update the reference to point to the archived copy
283 // of this string.
284 // If the string is too large to archive, NULL is
285 // stored into rr. At run time, string_at_impl() will create and intern
286 // the string.
287 rr->obj_at_put(i, archived_string);
288 }
289 }
290 }
291
292 oop archived = HeapShared::archive_object(rr);
293 // If the resolved references array is not archived (too large),
294 // the 'archived' object is NULL. No need to explicitly check
295 // the return value of archive_object() here. At runtime, the
296 // resolved references will be created using the normal process
297 // when there is no archived value.
298 _cache->set_archived_references(archived);
299 }
300 }
301
302 void ConstantPool::resolve_class_constants(TRAPS) {
303 assert(DumpSharedSpaces, "used during dump time only");
304 // The _cache may be NULL if the _pool_holder klass fails verification
305 // at dump time due to missing dependencies.
306 if (cache() == NULL || reference_map() == NULL) {
307 return; // nothing to do
308 }
309
310 constantPoolHandle cp(THREAD, this);
311 for (int index = 1; index < length(); index++) { // Index 0 is unused
312 if (tag_at(index).is_string()) {
313 int cache_index = cp->cp_to_object_index(index);
314 string_at_impl(cp, index, cache_index, CHECK);
315 }
316 }
317 }
318
319 void ConstantPool::add_dumped_interned_strings() {
320 objArrayOop rr = resolved_references();
321 if (rr != NULL) {
322 int rr_len = rr->length();
323 for (int i = 0; i < rr_len; i++) {
324 oop p = rr->obj_at(i);
325 if (java_lang_String::is_instance(p)) {
326 HeapShared::add_to_dumped_interned_strings(p);
327 }
328 }
329 }
330 }
331 #endif
332
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 // restore the C++ vtable from the shared archive
347 restore_vtable();
348
349 if (vmClasses::Object_klass_loaded()) {
350 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
351 #if INCLUDE_CDS_JAVA_HEAP
352 if (HeapShared::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()->remove_unshareable_info();
429 }
430 }
431
432 int ConstantPool::cp_to_object_index(int cp_index) {
433 // this is harder don't do this so much.
434 int i = reference_map()->find(cp_index);
435 // We might not find the index for jsr292 call.
436 return (i < 0) ? _no_index_sentinel : i;
437 }
438
439 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
440 resolved_references()->obj_at_put(obj_index, str);
441 }
442
443 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
444 ResourceMark rm;
445 int line_number = -1;
446 const char * source_file = NULL;
447 if (JavaThread::current()->has_last_Java_frame()) {
448 // try to identify the method which called this function.
449 vframeStream vfst(JavaThread::current());
450 if (!vfst.at_end()) {
451 line_number = vfst.method()->line_number_from_bci(vfst.bci());
452 Symbol* s = vfst.method()->method_holder()->source_file_name();
453 if (s != NULL) {
454 source_file = s->as_C_string();
455 }
456 }
457 }
458 if (k != this_cp->pool_holder()) {
459 // only print something if the classes are different
460 if (source_file != NULL) {
461 log_debug(class, resolve)("%s %s %s:%d",
462 this_cp->pool_holder()->external_name(),
463 k->external_name(), source_file, line_number);
464 } else {
465 log_debug(class, resolve)("%s %s",
466 this_cp->pool_holder()->external_name(),
467 k->external_name());
468 }
469 }
470 }
471
472 void check_is_inline_type(Klass* k, TRAPS) {
473 if (!k->is_inline_klass()) {
474 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
475 }
476 }
477
478 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
479 TRAPS) {
480 JavaThread* javaThread = THREAD;
481
482 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
483 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
484 // the entry and tag is not updated atomicly.
485 CPKlassSlot kslot = this_cp->klass_slot_at(which);
486 int resolved_klass_index = kslot.resolved_klass_index();
487 int name_index = kslot.name_index();
488 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
489
490 // The tag must be JVM_CONSTANT_Class in order to read the correct value from
491 // the unresolved_klasses() array.
492 if (this_cp->tag_at(which).is_klass()) {
493 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
494 if (klass != NULL) {
495 return klass;
496 }
497 }
498
499 // This tag doesn't change back to unresolved class unless at a safepoint.
500 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
501 // The original attempt to resolve this constant pool entry failed so find the
502 // class of the original error and throw another error of the same class
503 // (JVMS 5.4.3).
504 // If there is a detail message, pass that detail message to the error.
505 // The JVMS does not strictly require us to duplicate the same detail message,
506 // or any internal exception fields such as cause or stacktrace. But since the
507 // detail message is often a class name or other literal string, we will repeat it
508 // if we can find it in the symbol table.
509 throw_resolution_error(this_cp, which, CHECK_NULL);
510 ShouldNotReachHere();
511 }
512
513 Handle mirror_handle;
514 Symbol* name = this_cp->symbol_at(name_index);
515 bool inline_type_signature = false;
516 if (name->is_Q_signature()) {
517 name = name->fundamental_name(THREAD);
518 inline_type_signature = true;
519 }
520 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
521 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
522
523 Klass* k;
524 {
525 // Turn off the single stepping while doing class resolution
526 JvmtiHideSingleStepping jhss(javaThread);
527 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
528 } // JvmtiHideSingleStepping jhss(javaThread);
529 if (inline_type_signature) {
530 name->decrement_refcount();
531 }
532
533 if (!HAS_PENDING_EXCEPTION) {
534 // preserve the resolved klass from unloading
535 mirror_handle = Handle(THREAD, k->java_mirror());
536 // Do access check for klasses
537 verify_constant_pool_resolve(this_cp, k, THREAD);
538 }
539
540 if (!HAS_PENDING_EXCEPTION && inline_type_signature) {
541 check_is_inline_type(k, THREAD);
542 }
543
544 if (!HAS_PENDING_EXCEPTION) {
545 Klass* bottom_klass = NULL;
546 if (k->is_objArray_klass()) {
547 bottom_klass = ObjArrayKlass::cast(k)->bottom_klass();
548 assert(bottom_klass != NULL, "Should be set");
549 assert(bottom_klass->is_instance_klass() || bottom_klass->is_typeArray_klass(), "Sanity check");
550 } else if (k->is_flatArray_klass()) {
551 bottom_klass = FlatArrayKlass::cast(k)->element_klass();
552 assert(bottom_klass != NULL, "Should be set");
553 }
554 }
555
556 // Failed to resolve class. We must record the errors so that subsequent attempts
557 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
558 if (HAS_PENDING_EXCEPTION) {
559 jbyte tag = JVM_CONSTANT_UnresolvedClass;
560 if (this_cp->tag_at(which).is_Qdescriptor_klass()) {
561 tag |= JVM_CONSTANT_QDescBit;
562 }
563 save_and_throw_exception(this_cp, which, constantTag(tag), CHECK_NULL);
564 // If CHECK_NULL above doesn't return the exception, that means that
565 // some other thread has beaten us and has resolved the class.
566 // To preserve old behavior, we return the resolved class.
567 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
568 assert(klass != NULL, "must be resolved if exception was cleared");
569 return klass;
570 }
571
572 // logging for class+resolve.
573 if (log_is_enabled(Debug, class, resolve)){
574 trace_class_resolution(this_cp, k);
575 }
576
577 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
578 Atomic::release_store(adr, k);
579 // The interpreter assumes when the tag is stored, the klass is resolved
580 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
581 // hardware store ordering here.
582 jbyte tag = JVM_CONSTANT_Class;
583 if (this_cp->tag_at(which).is_Qdescriptor_klass()) {
584 tag |= JVM_CONSTANT_QDescBit;
585 }
586 // We also need to CAS to not overwrite an error from a racing thread.
587
588 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
589 (jbyte)JVM_CONSTANT_UnresolvedClass,
590 tag);
591
592 // We need to recheck exceptions from racing thread and return the same.
593 if (old_tag == JVM_CONSTANT_UnresolvedClassInError) {
594 // Remove klass.
595 this_cp->resolved_klasses()->at_put(resolved_klass_index, NULL);
596 throw_resolution_error(this_cp, which, CHECK_NULL);
597 }
598
599 return k;
600 }
601
602
603 // Does not update ConstantPool* - to avoid any exception throwing. Used
604 // by compiler and exception handling. Also used to avoid classloads for
605 // instanceof operations. Returns NULL if the class has not been loaded or
606 // if the verification of constant pool failed
607 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
608 CPKlassSlot kslot = this_cp->klass_slot_at(which);
609 int resolved_klass_index = kslot.resolved_klass_index();
610 int name_index = kslot.name_index();
611 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
612
613 if (this_cp->tag_at(which).is_klass()) {
614 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
615 assert(k != NULL, "should be resolved");
616 return k;
617 } else if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
618 return NULL;
619 } else {
620 Thread* current = Thread::current();
621 Symbol* name = this_cp->symbol_at(name_index);
622 oop loader = this_cp->pool_holder()->class_loader();
623 oop protection_domain = this_cp->pool_holder()->protection_domain();
624 Handle h_prot (current, protection_domain);
625 Handle h_loader (current, loader);
626 Klass* k = SystemDictionary::find_instance_klass(name, h_loader, h_prot);
627
628 // Avoid constant pool verification at a safepoint, as it takes the Module_lock.
629 if (k != NULL && current->is_Java_thread()) {
630 // Make sure that resolving is legal
631 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
632 ExceptionMark em(THREAD);
633 // return NULL if verification fails
634 verify_constant_pool_resolve(this_cp, k, THREAD);
635 if (HAS_PENDING_EXCEPTION) {
636 CLEAR_PENDING_EXCEPTION;
637 return NULL;
638 }
639 return k;
640 } else {
641 return k;
642 }
643 }
644 }
645
646 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
647 int which) {
648 if (cpool->cache() == NULL) return NULL; // nothing to load yet
649 int cache_index = decode_cpcache_index(which, true);
650 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
651 // FIXME: should be an assert
652 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
653 return NULL;
654 }
655 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
656 return e->method_if_resolved(cpool);
657 }
658
659
660 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
661 if (cpool->cache() == NULL) return false; // nothing to load yet
662 int cache_index = decode_cpcache_index(which, true);
663 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
664 return e->has_appendix();
665 }
666
667 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
668 if (cpool->cache() == NULL) return NULL; // nothing to load yet
669 int cache_index = decode_cpcache_index(which, true);
670 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
671 return e->appendix_if_resolved(cpool);
672 }
673
674
675 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) {
676 if (cpool->cache() == NULL) return false; // nothing to load yet
677 int cache_index = decode_cpcache_index(which, true);
678 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
679 return e->has_local_signature();
680 }
681
682 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
683 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
684 return symbol_at(name_index);
685 }
686
687
688 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
689 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
690 return symbol_at(signature_index);
691 }
692
693 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
694 int i = which;
695 if (!uncached && cache() != NULL) {
696 if (ConstantPool::is_invokedynamic_index(which)) {
697 // Invokedynamic index is index into the constant pool cache
698 int pool_index = invokedynamic_bootstrap_ref_index_at(which);
699 pool_index = bootstrap_name_and_type_ref_index_at(pool_index);
700 assert(tag_at(pool_index).is_name_and_type(), "");
701 return pool_index;
702 }
703 // change byte-ordering and go via cache
704 i = remap_instruction_operand_from_cache(which);
705 } else {
706 if (tag_at(which).has_bootstrap()) {
707 int pool_index = bootstrap_name_and_type_ref_index_at(which);
708 assert(tag_at(pool_index).is_name_and_type(), "");
709 return pool_index;
710 }
711 }
712 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
713 assert(!tag_at(i).has_bootstrap(), "Must be handled above");
714 jint ref_index = *int_at_addr(i);
715 return extract_high_short_from_int(ref_index);
716 }
717
718 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
719 int pool_index = which;
720 if (!uncached && cache() != NULL) {
721 if (ConstantPool::is_invokedynamic_index(which)) {
722 // Invokedynamic index is index into resolved_references
723 pool_index = invokedynamic_bootstrap_ref_index_at(which);
724 } else {
725 // change byte-ordering and go via cache
726 pool_index = remap_instruction_operand_from_cache(which);
727 }
728 }
729 return tag_at(pool_index);
730 }
731
732 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
733 guarantee(!ConstantPool::is_invokedynamic_index(which),
734 "an invokedynamic instruction does not have a klass");
735 int i = which;
736 if (!uncached && cache() != NULL) {
737 // change byte-ordering and go via cache
738 i = remap_instruction_operand_from_cache(which);
739 }
740 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
741 jint ref_index = *int_at_addr(i);
742 return extract_low_short_from_int(ref_index);
743 }
744
745
746
747 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
748 int cpc_index = operand;
749 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
750 assert((int)(u2)cpc_index == cpc_index, "clean u2");
751 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
752 return member_index;
753 }
754
755
756 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
757 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
758 return; // short cut, typeArray klass is always accessible
759 }
760 Klass* holder = this_cp->pool_holder();
761 LinkResolver::check_klass_accessibility(holder, k, CHECK);
762 }
763
764
765 int ConstantPool::name_ref_index_at(int which_nt) {
766 jint ref_index = name_and_type_at(which_nt);
767 return extract_low_short_from_int(ref_index);
768 }
769
770
771 int ConstantPool::signature_ref_index_at(int which_nt) {
772 jint ref_index = name_and_type_at(which_nt);
773 return extract_high_short_from_int(ref_index);
774 }
775
776
777 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
778 return klass_at(klass_ref_index_at(which), THREAD);
779 }
780
781 Symbol* ConstantPool::klass_name_at(int which) const {
782 return symbol_at(klass_slot_at(which).name_index());
783 }
784
785 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
786 jint ref_index = klass_ref_index_at(which);
787 return klass_at_noresolve(ref_index);
788 }
789
790 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
791 jint ref_index = uncached_klass_ref_index_at(which);
792 return klass_at_noresolve(ref_index);
793 }
794
795 char* ConstantPool::string_at_noresolve(int which) {
796 return unresolved_string_at(which)->as_C_string();
797 }
798
799 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
800 return Signature::basic_type(symbol_at(which));
801 }
802
803
804 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
805 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
806 if (this_cp->tag_at(index).is_string()) {
807 this_cp->string_at(index, CHECK);
808 }
809 }
810 }
811
812 static Symbol* exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
813 // Dig out the detailed message to reuse if possible
814 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
815 if (message != NULL) {
816 return message;
817 }
818
819 // Return specific message for the tag
820 switch (tag.value()) {
821 case JVM_CONSTANT_UnresolvedClass:
822 // return the class name in the error message
823 message = this_cp->klass_name_at(which);
824 break;
825 case JVM_CONSTANT_MethodHandle:
826 // return the method handle name in the error message
827 message = this_cp->method_handle_name_ref_at(which);
828 break;
829 case JVM_CONSTANT_MethodType:
830 // return the method type signature in the error message
831 message = this_cp->method_type_signature_at(which);
832 break;
833 case JVM_CONSTANT_Dynamic:
834 // return the name of the condy in the error message
835 message = this_cp->uncached_name_ref_at(which);
836 break;
837 default:
838 ShouldNotReachHere();
839 }
840
841 return message;
842 }
843
844 static void add_resolution_error(const constantPoolHandle& this_cp, int which,
845 constantTag tag, oop pending_exception) {
846
847 Symbol* error = pending_exception->klass()->name();
848 oop cause = java_lang_Throwable::cause(pending_exception);
849
850 // Also dig out the exception cause, if present.
851 Symbol* cause_sym = NULL;
852 Symbol* cause_msg = NULL;
853 if (cause != NULL && cause != pending_exception) {
854 cause_sym = cause->klass()->name();
855 cause_msg = java_lang_Throwable::detail_message(cause);
856 }
857
858 Symbol* message = exception_message(this_cp, which, tag, pending_exception);
859 SystemDictionary::add_resolution_error(this_cp, which, error, message, cause_sym, cause_msg);
860 }
861
862
863 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
864 ResourceMark rm(THREAD);
865 Symbol* message = NULL;
866 Symbol* cause = NULL;
867 Symbol* cause_msg = NULL;
868 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message, &cause, &cause_msg);
869 assert(error != NULL, "checking");
870 const char* cause_str = cause_msg != NULL ? cause_msg->as_C_string() : NULL;
871
872 CLEAR_PENDING_EXCEPTION;
873 if (message != NULL) {
874 char* msg = message->as_C_string();
875 if (cause != NULL) {
876 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_str);
877 THROW_MSG_CAUSE(error, msg, h_cause);
878 } else {
879 THROW_MSG(error, msg);
880 }
881 } else {
882 if (cause != NULL) {
883 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_str);
884 THROW_CAUSE(error, h_cause);
885 } else {
886 THROW(error);
887 }
888 }
889 }
890
891 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
892 // exception in the resolution error table, so that the same exception is thrown again.
893 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
894 constantTag tag, TRAPS) {
895
896 int error_tag = tag.error_value();
897
898 if (!PENDING_EXCEPTION->
899 is_a(vmClasses::LinkageError_klass())) {
900 // Just throw the exception and don't prevent these classes from
901 // being loaded due to virtual machine errors like StackOverflow
902 // and OutOfMemoryError, etc, or if the thread was hit by stop()
903 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
904 } else if (this_cp->tag_at(which).value() != error_tag) {
905 add_resolution_error(this_cp, which, tag, PENDING_EXCEPTION);
906 // CAS in the tag. If a thread beat us to registering this error that's fine.
907 // If another thread resolved the reference, this is a race condition. This
908 // thread may have had a security manager or something temporary.
909 // This doesn't deterministically get an error. So why do we save this?
910 // We save this because jvmti can add classes to the bootclass path after
911 // this error, so it needs to get the same error if the error is first.
912 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
913 (jbyte)tag.value(),
914 (jbyte)error_tag);
915 if (old_tag != error_tag && old_tag != tag.value()) {
916 // MethodHandles and MethodType doesn't change to resolved version.
917 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
918 // Forget the exception and use the resolved class.
919 CLEAR_PENDING_EXCEPTION;
920 }
921 } else {
922 // some other thread put this in error state
923 throw_resolution_error(this_cp, which, CHECK);
924 }
925 }
926
927 constantTag ConstantPool::constant_tag_at(int which) {
928 constantTag tag = tag_at(which);
929 if (tag.is_dynamic_constant() ||
930 tag.is_dynamic_constant_in_error()) {
931 BasicType bt = basic_type_for_constant_at(which);
932 // dynamic constant could return an array, treat as object
933 return constantTag::ofBasicType(is_reference_type(bt) ? T_OBJECT : 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_UnresolvedClassInError:
1021 case JVM_CONSTANT_Class:
1022 {
1023 assert(cache_index == _no_index_sentinel, "should not have been set");
1024 Klass* resolved = klass_at_impl(this_cp, index, CHECK_NULL);
1025 // ldc wants the java mirror.
1026 result_oop = tag.is_Qdescriptor_klass()
1027 ? InlineKlass::cast(resolved)->val_mirror()
1028 : resolved->java_mirror();
1029 break;
1030 }
1031
1032 case JVM_CONSTANT_Dynamic:
1033 {
1034 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
1035 BootstrapInfo bootstrap_specifier(this_cp, index);
1036
1037 // The initial step in resolving an unresolved symbolic reference to a
1038 // dynamically-computed constant is to resolve the symbolic reference to a
1039 // method handle which will be the bootstrap method for the dynamically-computed
1040 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
1041 // method fails, then a MethodHandleInError is stored at the corresponding
1042 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
1043 // set a DynamicConstantInError here since any subsequent use of this
1044 // bootstrap method will encounter the resolution of MethodHandleInError.
1045 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
1046 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
1047 // for the bootstrap_specifier created above.
1048 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1049 Exceptions::wrap_dynamic_exception(/* is_indy */ false, THREAD);
1050 if (HAS_PENDING_EXCEPTION) {
1051 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
1052 // will check for a LinkageError and store a DynamicConstantInError.
1053 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1054 }
1055 result_oop = bootstrap_specifier.resolved_value()();
1056 BasicType type = Signature::basic_type(bootstrap_specifier.signature());
1057 if (!is_reference_type(type)) {
1058 // Make sure the primitive value is properly boxed.
1059 // This is a JDK responsibility.
1060 const char* fail = NULL;
1061 if (result_oop == NULL) {
1062 fail = "null result instead of box";
1063 } else if (!is_java_primitive(type)) {
1064 // FIXME: support value types via unboxing
1065 fail = "can only handle references and primitives";
1066 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
1067 fail = "primitive is not properly boxed";
1068 }
1069 if (fail != NULL) {
1070 // Since this exception is not a LinkageError, throw exception
1071 // but do not save a DynamicInError resolution result.
1072 // See section 5.4.3 of the VM spec.
1073 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
1074 }
1075 }
1076
1077 LogTarget(Debug, methodhandles, condy) lt_condy;
1078 if (lt_condy.is_enabled()) {
1079 LogStream ls(lt_condy);
1080 bootstrap_specifier.print_msg_on(&ls, "resolve_constant_at_impl");
1081 }
1082 break;
1083 }
1084
1085 case JVM_CONSTANT_String:
1086 assert(cache_index != _no_index_sentinel, "should have been set");
1087 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
1088 break;
1089
1090 case JVM_CONSTANT_DynamicInError:
1091 case JVM_CONSTANT_MethodHandleInError:
1092 case JVM_CONSTANT_MethodTypeInError:
1093 {
1094 throw_resolution_error(this_cp, index, CHECK_NULL);
1095 break;
1096 }
1097
1098 case JVM_CONSTANT_MethodHandle:
1099 {
1100 int ref_kind = this_cp->method_handle_ref_kind_at(index);
1101 int callee_index = this_cp->method_handle_klass_index_at(index);
1102 Symbol* name = this_cp->method_handle_name_ref_at(index);
1103 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
1104 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
1105 { ResourceMark rm(THREAD);
1106 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1107 ref_kind, index, this_cp->method_handle_index_at(index),
1108 callee_index, name->as_C_string(), signature->as_C_string());
1109 }
1110
1111 Klass* callee = klass_at_impl(this_cp, callee_index, CHECK_NULL);
1112
1113 // Check constant pool method consistency
1114 if ((callee->is_interface() && m_tag.is_method()) ||
1115 ((!callee->is_interface() && m_tag.is_interface_method()))) {
1116 ResourceMark rm(THREAD);
1117 stringStream ss;
1118 ss.print("Inconsistent constant pool data in classfile for class %s. "
1119 "Method '", callee->name()->as_C_string());
1120 signature->print_as_signature_external_return_type(&ss);
1121 ss.print(" %s(", name->as_C_string());
1122 signature->print_as_signature_external_parameters(&ss);
1123 ss.print(")' at index %d is %s and should be %s",
1124 index,
1125 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1126 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1127 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1128 }
1129
1130 Klass* klass = this_cp->pool_holder();
1131 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1132 callee, name, signature,
1133 THREAD);
1134 result_oop = value();
1135 if (HAS_PENDING_EXCEPTION) {
1136 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1137 }
1138 break;
1139 }
1140
1141 case JVM_CONSTANT_MethodType:
1142 {
1143 Symbol* signature = this_cp->method_type_signature_at(index);
1144 { ResourceMark rm(THREAD);
1145 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1146 index, this_cp->method_type_index_at(index),
1147 signature->as_C_string());
1148 }
1149 Klass* klass = this_cp->pool_holder();
1150 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1151 result_oop = value();
1152 if (HAS_PENDING_EXCEPTION) {
1153 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1154 }
1155 break;
1156 }
1157
1158 case JVM_CONSTANT_Integer:
1159 assert(cache_index == _no_index_sentinel, "should not have been set");
1160 prim_value.i = this_cp->int_at(index);
1161 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1162 break;
1163
1164 case JVM_CONSTANT_Float:
1165 assert(cache_index == _no_index_sentinel, "should not have been set");
1166 prim_value.f = this_cp->float_at(index);
1167 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1168 break;
1169
1170 case JVM_CONSTANT_Long:
1171 assert(cache_index == _no_index_sentinel, "should not have been set");
1172 prim_value.j = this_cp->long_at(index);
1173 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1174 break;
1175
1176 case JVM_CONSTANT_Double:
1177 assert(cache_index == _no_index_sentinel, "should not have been set");
1178 prim_value.d = this_cp->double_at(index);
1179 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1180 break;
1181
1182 default:
1183 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
1184 this_cp(), index, cache_index, tag.value()));
1185 assert(false, "unexpected constant tag");
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 argc;
1225 int limit = pos + end_arg - start_arg;
1226 // checks: index in range [0..this_cp->length),
1227 // tag at index, start..end in range [0..argc],
1228 // info array non-null, pos..limit in [0..info.length]
1229 if ((0 >= index || index >= this_cp->length()) ||
1230 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1231 this_cp->tag_at(index).is_dynamic_constant()) ||
1232 (0 > start_arg || start_arg > end_arg) ||
1233 (end_arg > (argc = this_cp->bootstrap_argument_count_at(index))) ||
1234 (0 > pos || pos > limit) ||
1235 (info.is_null() || limit > info->length())) {
1236 // An index or something else went wrong; throw an error.
1237 // Since this is an internal API, we don't expect this,
1238 // so we don't bother to craft a nice message.
1239 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1240 }
1241 // now we can loop safely
1242 int info_i = pos;
1243 for (int i = start_arg; i < end_arg; i++) {
1244 int arg_index = this_cp->bootstrap_argument_index_at(index, i);
1245 oop arg_oop;
1246 if (must_resolve) {
1247 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1248 } else {
1249 bool found_it = false;
1250 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1251 if (!found_it) arg_oop = if_not_available();
1252 }
1253 info->obj_at_put(info_i++, arg_oop);
1254 }
1255 }
1256
1257 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1258 // If the string has already been interned, this entry will be non-null
1259 oop str = this_cp->resolved_references()->obj_at(obj_index);
1260 assert(str != Universe::the_null_sentinel(), "");
1261 if (str != NULL) return str;
1262 Symbol* sym = this_cp->unresolved_string_at(which);
1263 str = StringTable::intern(sym, CHECK_(NULL));
1264 this_cp->string_at_put(which, obj_index, str);
1265 assert(java_lang_String::is_instance(str), "must be string");
1266 return str;
1267 }
1268
1269
1270 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1271 // Names are interned, so we can compare Symbol*s directly
1272 Symbol* cp_name = klass_name_at(which);
1273 return (cp_name == k->name());
1274 }
1275
1276
1277 // Iterate over symbols and decrement ones which are Symbol*s
1278 // This is done during GC.
1279 // Only decrement the UTF8 symbols. Strings point to
1280 // these symbols but didn't increment the reference count.
1281 void ConstantPool::unreference_symbols() {
1282 for (int index = 1; index < length(); index++) { // Index 0 is unused
1283 constantTag tag = tag_at(index);
1284 if (tag.is_symbol()) {
1285 symbol_at(index)->decrement_refcount();
1286 }
1287 }
1288 }
1289
1290
1291 // Compare this constant pool's entry at index1 to the constant pool
1292 // cp2's entry at index2.
1293 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1294 int index2) {
1295
1296 // The error tags are equivalent to non-error tags when comparing
1297 jbyte t1 = tag_at(index1).non_error_value();
1298 jbyte t2 = cp2->tag_at(index2).non_error_value();
1299
1300 if (t1 != t2) {
1301 // Not the same entry type so there is nothing else to check. Note
1302 // that this style of checking will consider resolved/unresolved
1303 // class pairs as different.
1304 // From the ConstantPool* API point of view, this is correct
1305 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1306 // plays out in the context of ConstantPool* merging.
1307 return false;
1308 }
1309
1310 switch (t1) {
1311 case JVM_CONSTANT_Class:
1312 {
1313 Klass* k1 = resolved_klass_at(index1);
1314 Klass* k2 = cp2->resolved_klass_at(index2);
1315 if (k1 == k2) {
1316 return true;
1317 }
1318 } break;
1319
1320 case JVM_CONSTANT_ClassIndex:
1321 {
1322 int recur1 = klass_index_at(index1);
1323 int recur2 = cp2->klass_index_at(index2);
1324 if (compare_entry_to(recur1, cp2, recur2)) {
1325 return true;
1326 }
1327 } break;
1328
1329 case JVM_CONSTANT_Double:
1330 {
1331 jdouble d1 = double_at(index1);
1332 jdouble d2 = cp2->double_at(index2);
1333 if (d1 == d2) {
1334 return true;
1335 }
1336 } break;
1337
1338 case JVM_CONSTANT_Fieldref:
1339 case JVM_CONSTANT_InterfaceMethodref:
1340 case JVM_CONSTANT_Methodref:
1341 {
1342 int recur1 = uncached_klass_ref_index_at(index1);
1343 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1344 bool match = compare_entry_to(recur1, cp2, recur2);
1345 if (match) {
1346 recur1 = uncached_name_and_type_ref_index_at(index1);
1347 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1348 if (compare_entry_to(recur1, cp2, recur2)) {
1349 return true;
1350 }
1351 }
1352 } break;
1353
1354 case JVM_CONSTANT_Float:
1355 {
1356 jfloat f1 = float_at(index1);
1357 jfloat f2 = cp2->float_at(index2);
1358 if (f1 == f2) {
1359 return true;
1360 }
1361 } break;
1362
1363 case JVM_CONSTANT_Integer:
1364 {
1365 jint i1 = int_at(index1);
1366 jint i2 = cp2->int_at(index2);
1367 if (i1 == i2) {
1368 return true;
1369 }
1370 } break;
1371
1372 case JVM_CONSTANT_Long:
1373 {
1374 jlong l1 = long_at(index1);
1375 jlong l2 = cp2->long_at(index2);
1376 if (l1 == l2) {
1377 return true;
1378 }
1379 } break;
1380
1381 case JVM_CONSTANT_NameAndType:
1382 {
1383 int recur1 = name_ref_index_at(index1);
1384 int recur2 = cp2->name_ref_index_at(index2);
1385 if (compare_entry_to(recur1, cp2, recur2)) {
1386 recur1 = signature_ref_index_at(index1);
1387 recur2 = cp2->signature_ref_index_at(index2);
1388 if (compare_entry_to(recur1, cp2, recur2)) {
1389 return true;
1390 }
1391 }
1392 } break;
1393
1394 case JVM_CONSTANT_StringIndex:
1395 {
1396 int recur1 = string_index_at(index1);
1397 int recur2 = cp2->string_index_at(index2);
1398 if (compare_entry_to(recur1, cp2, recur2)) {
1399 return true;
1400 }
1401 } break;
1402
1403 case JVM_CONSTANT_UnresolvedClass:
1404 {
1405 Symbol* k1 = klass_name_at(index1);
1406 Symbol* k2 = cp2->klass_name_at(index2);
1407 if (k1 == k2) {
1408 return true;
1409 }
1410 } break;
1411
1412 case JVM_CONSTANT_MethodType:
1413 {
1414 int k1 = method_type_index_at(index1);
1415 int k2 = cp2->method_type_index_at(index2);
1416 if (compare_entry_to(k1, cp2, k2)) {
1417 return true;
1418 }
1419 } break;
1420
1421 case JVM_CONSTANT_MethodHandle:
1422 {
1423 int k1 = method_handle_ref_kind_at(index1);
1424 int k2 = cp2->method_handle_ref_kind_at(index2);
1425 if (k1 == k2) {
1426 int i1 = method_handle_index_at(index1);
1427 int i2 = cp2->method_handle_index_at(index2);
1428 if (compare_entry_to(i1, cp2, i2)) {
1429 return true;
1430 }
1431 }
1432 } break;
1433
1434 case JVM_CONSTANT_Dynamic:
1435 {
1436 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1437 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1438 int i1 = bootstrap_methods_attribute_index(index1);
1439 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1440 bool match_entry = compare_entry_to(k1, cp2, k2);
1441 bool match_operand = compare_operand_to(i1, cp2, i2);
1442 return (match_entry && match_operand);
1443 } break;
1444
1445 case JVM_CONSTANT_InvokeDynamic:
1446 {
1447 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1448 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1449 int i1 = bootstrap_methods_attribute_index(index1);
1450 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1451 bool match_entry = compare_entry_to(k1, cp2, k2);
1452 bool match_operand = compare_operand_to(i1, cp2, i2);
1453 return (match_entry && match_operand);
1454 } break;
1455
1456 case JVM_CONSTANT_String:
1457 {
1458 Symbol* s1 = unresolved_string_at(index1);
1459 Symbol* s2 = cp2->unresolved_string_at(index2);
1460 if (s1 == s2) {
1461 return true;
1462 }
1463 } break;
1464
1465 case JVM_CONSTANT_Utf8:
1466 {
1467 Symbol* s1 = symbol_at(index1);
1468 Symbol* s2 = cp2->symbol_at(index2);
1469 if (s1 == s2) {
1470 return true;
1471 }
1472 } break;
1473
1474 // Invalid is used as the tag for the second constant pool entry
1475 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1476 // not be seen by itself.
1477 case JVM_CONSTANT_Invalid: // fall through
1478
1479 default:
1480 ShouldNotReachHere();
1481 break;
1482 }
1483
1484 return false;
1485 } // end compare_entry_to()
1486
1487
1488 // Resize the operands array with delta_len and delta_size.
1489 // Used in RedefineClasses for CP merge.
1490 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1491 int old_len = operand_array_length(operands());
1492 int new_len = old_len + delta_len;
1493 int min_len = (delta_len > 0) ? old_len : new_len;
1494
1495 int old_size = operands()->length();
1496 int new_size = old_size + delta_size;
1497 int min_size = (delta_size > 0) ? old_size : new_size;
1498
1499 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1500 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1501
1502 // Set index in the resized array for existing elements only
1503 for (int idx = 0; idx < min_len; idx++) {
1504 int offset = operand_offset_at(idx); // offset in original array
1505 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1506 }
1507 // Copy the bootstrap specifiers only
1508 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1509 new_ops->adr_at(2*new_len),
1510 (min_size - 2*min_len) * sizeof(u2));
1511 // Explicitly deallocate old operands array.
1512 // Note, it is not needed for 7u backport.
1513 if ( operands() != NULL) { // the safety check
1514 MetadataFactory::free_array<u2>(loader_data, operands());
1515 }
1516 set_operands(new_ops);
1517 } // end resize_operands()
1518
1519
1520 // Extend the operands array with the length and size of the ext_cp operands.
1521 // Used in RedefineClasses for CP merge.
1522 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1523 int delta_len = operand_array_length(ext_cp->operands());
1524 if (delta_len == 0) {
1525 return; // nothing to do
1526 }
1527 int delta_size = ext_cp->operands()->length();
1528
1529 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1530
1531 if (operand_array_length(operands()) == 0) {
1532 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1533 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1534 // The first element index defines the offset of second part
1535 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1536 set_operands(new_ops);
1537 } else {
1538 resize_operands(delta_len, delta_size, CHECK);
1539 }
1540
1541 } // end extend_operands()
1542
1543
1544 // Shrink the operands array to a smaller array with new_len length.
1545 // Used in RedefineClasses for CP merge.
1546 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1547 int old_len = operand_array_length(operands());
1548 if (new_len == old_len) {
1549 return; // nothing to do
1550 }
1551 assert(new_len < old_len, "shrunken operands array must be smaller");
1552
1553 int free_base = operand_next_offset_at(new_len - 1);
1554 int delta_len = new_len - old_len;
1555 int delta_size = 2*delta_len + free_base - operands()->length();
1556
1557 resize_operands(delta_len, delta_size, CHECK);
1558
1559 } // end shrink_operands()
1560
1561
1562 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1563 const constantPoolHandle& to_cp,
1564 TRAPS) {
1565
1566 int from_oplen = operand_array_length(from_cp->operands());
1567 int old_oplen = operand_array_length(to_cp->operands());
1568 if (from_oplen != 0) {
1569 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1570 // append my operands to the target's operands array
1571 if (old_oplen == 0) {
1572 // Can't just reuse from_cp's operand list because of deallocation issues
1573 int len = from_cp->operands()->length();
1574 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1575 Copy::conjoint_memory_atomic(
1576 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1577 to_cp->set_operands(new_ops);
1578 } else {
1579 int old_len = to_cp->operands()->length();
1580 int from_len = from_cp->operands()->length();
1581 int old_off = old_oplen * sizeof(u2);
1582 int from_off = from_oplen * sizeof(u2);
1583 // Use the metaspace for the destination constant pool
1584 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1585 int fillp = 0, len = 0;
1586 // first part of dest
1587 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1588 new_operands->adr_at(fillp),
1589 (len = old_off) * sizeof(u2));
1590 fillp += len;
1591 // first part of src
1592 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1593 new_operands->adr_at(fillp),
1594 (len = from_off) * sizeof(u2));
1595 fillp += len;
1596 // second part of dest
1597 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1598 new_operands->adr_at(fillp),
1599 (len = old_len - old_off) * sizeof(u2));
1600 fillp += len;
1601 // second part of src
1602 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1603 new_operands->adr_at(fillp),
1604 (len = from_len - from_off) * sizeof(u2));
1605 fillp += len;
1606 assert(fillp == new_operands->length(), "");
1607
1608 // Adjust indexes in the first part of the copied operands array.
1609 for (int j = 0; j < from_oplen; j++) {
1610 int offset = operand_offset_at(new_operands, old_oplen + j);
1611 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1612 offset += old_len; // every new tuple is preceded by old_len extra u2's
1613 operand_offset_at_put(new_operands, old_oplen + j, offset);
1614 }
1615
1616 // replace target operands array with combined array
1617 to_cp->set_operands(new_operands);
1618 }
1619 }
1620 } // end copy_operands()
1621
1622
1623 // Copy this constant pool's entries at start_i to end_i (inclusive)
1624 // to the constant pool to_cp's entries starting at to_i. A total of
1625 // (end_i - start_i) + 1 entries are copied.
1626 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1627 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1628
1629
1630 int dest_i = to_i; // leave original alone for debug purposes
1631
1632 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1633 copy_entry_to(from_cp, src_i, to_cp, dest_i);
1634
1635 switch (from_cp->tag_at(src_i).value()) {
1636 case JVM_CONSTANT_Double:
1637 case JVM_CONSTANT_Long:
1638 // double and long take two constant pool entries
1639 src_i += 2;
1640 dest_i += 2;
1641 break;
1642
1643 default:
1644 // all others take one constant pool entry
1645 src_i++;
1646 dest_i++;
1647 break;
1648 }
1649 }
1650 copy_operands(from_cp, to_cp, CHECK);
1651
1652 } // end copy_cp_to_impl()
1653
1654
1655 // Copy this constant pool's entry at from_i to the constant pool
1656 // to_cp's entry at to_i.
1657 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1658 const constantPoolHandle& to_cp, int to_i) {
1659
1660 int tag = from_cp->tag_at(from_i).value();
1661 switch (tag) {
1662 case JVM_CONSTANT_ClassIndex:
1663 {
1664 jint ki = from_cp->klass_index_at(from_i);
1665 to_cp->klass_index_at_put(to_i, ki);
1666 } break;
1667
1668 case JVM_CONSTANT_Double:
1669 {
1670 jdouble d = from_cp->double_at(from_i);
1671 to_cp->double_at_put(to_i, d);
1672 // double takes two constant pool entries so init second entry's tag
1673 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1674 } break;
1675
1676 case JVM_CONSTANT_Fieldref:
1677 {
1678 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1679 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1680 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1681 } break;
1682
1683 case JVM_CONSTANT_Float:
1684 {
1685 jfloat f = from_cp->float_at(from_i);
1686 to_cp->float_at_put(to_i, f);
1687 } break;
1688
1689 case JVM_CONSTANT_Integer:
1690 {
1691 jint i = from_cp->int_at(from_i);
1692 to_cp->int_at_put(to_i, i);
1693 } break;
1694
1695 case JVM_CONSTANT_InterfaceMethodref:
1696 {
1697 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1698 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1699 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1700 } break;
1701
1702 case JVM_CONSTANT_Long:
1703 {
1704 jlong l = from_cp->long_at(from_i);
1705 to_cp->long_at_put(to_i, l);
1706 // long takes two constant pool entries so init second entry's tag
1707 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1708 } break;
1709
1710 case JVM_CONSTANT_Methodref:
1711 {
1712 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1713 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1714 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1715 } break;
1716
1717 case JVM_CONSTANT_NameAndType:
1718 {
1719 int name_ref_index = from_cp->name_ref_index_at(from_i);
1720 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1721 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1722 } break;
1723
1724 case JVM_CONSTANT_StringIndex:
1725 {
1726 jint si = from_cp->string_index_at(from_i);
1727 to_cp->string_index_at_put(to_i, si);
1728 } break;
1729
1730 case JVM_CONSTANT_Class:
1731 case JVM_CONSTANT_UnresolvedClass:
1732 case JVM_CONSTANT_UnresolvedClassInError:
1733 {
1734 // Revert to JVM_CONSTANT_ClassIndex
1735 int name_index = from_cp->klass_slot_at(from_i).name_index();
1736 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1737 to_cp->klass_index_at_put(to_i, name_index);
1738 } break;
1739
1740 case JVM_CONSTANT_String:
1741 {
1742 Symbol* s = from_cp->unresolved_string_at(from_i);
1743 to_cp->unresolved_string_at_put(to_i, s);
1744 } break;
1745
1746 case JVM_CONSTANT_Utf8:
1747 {
1748 Symbol* s = from_cp->symbol_at(from_i);
1749 // Need to increase refcount, the old one will be thrown away and deferenced
1750 s->increment_refcount();
1751 to_cp->symbol_at_put(to_i, s);
1752 } break;
1753
1754 case JVM_CONSTANT_MethodType:
1755 case JVM_CONSTANT_MethodTypeInError:
1756 {
1757 jint k = from_cp->method_type_index_at(from_i);
1758 to_cp->method_type_index_at_put(to_i, k);
1759 } break;
1760
1761 case JVM_CONSTANT_MethodHandle:
1762 case JVM_CONSTANT_MethodHandleInError:
1763 {
1764 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1765 int k2 = from_cp->method_handle_index_at(from_i);
1766 to_cp->method_handle_index_at_put(to_i, k1, k2);
1767 } break;
1768
1769 case JVM_CONSTANT_Dynamic:
1770 case JVM_CONSTANT_DynamicInError:
1771 {
1772 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1773 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1774 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1775 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1776 } break;
1777
1778 case JVM_CONSTANT_InvokeDynamic:
1779 {
1780 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1781 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1782 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1783 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1784 } break;
1785
1786 // Invalid is used as the tag for the second constant pool entry
1787 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1788 // not be seen by itself.
1789 case JVM_CONSTANT_Invalid: // fall through
1790
1791 default:
1792 {
1793 ShouldNotReachHere();
1794 } break;
1795 }
1796 } // end copy_entry_to()
1797
1798 // Search constant pool search_cp for an entry that matches this
1799 // constant pool's entry at pattern_i. Returns the index of a
1800 // matching entry or zero (0) if there is no matching entry.
1801 int ConstantPool::find_matching_entry(int pattern_i,
1802 const constantPoolHandle& search_cp) {
1803
1804 // index zero (0) is not used
1805 for (int i = 1; i < search_cp->length(); i++) {
1806 bool found = compare_entry_to(pattern_i, search_cp, i);
1807 if (found) {
1808 return i;
1809 }
1810 }
1811
1812 return 0; // entry not found; return unused index zero (0)
1813 } // end find_matching_entry()
1814
1815
1816 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1817 // cp2's bootstrap specifier at idx2.
1818 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2) {
1819 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1820 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1821 bool match = compare_entry_to(k1, cp2, k2);
1822
1823 if (!match) {
1824 return false;
1825 }
1826 int argc = operand_argument_count_at(idx1);
1827 if (argc == cp2->operand_argument_count_at(idx2)) {
1828 for (int j = 0; j < argc; j++) {
1829 k1 = operand_argument_index_at(idx1, j);
1830 k2 = cp2->operand_argument_index_at(idx2, j);
1831 match = compare_entry_to(k1, cp2, k2);
1832 if (!match) {
1833 return false;
1834 }
1835 }
1836 return true; // got through loop; all elements equal
1837 }
1838 return false;
1839 } // end compare_operand_to()
1840
1841 // Search constant pool search_cp for a bootstrap specifier that matches
1842 // this constant pool's bootstrap specifier data at pattern_i index.
1843 // Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1844 int ConstantPool::find_matching_operand(int pattern_i,
1845 const constantPoolHandle& search_cp, int search_len) {
1846 for (int i = 0; i < search_len; i++) {
1847 bool found = compare_operand_to(pattern_i, search_cp, i);
1848 if (found) {
1849 return i;
1850 }
1851 }
1852 return -1; // bootstrap specifier data not found; return unused index (-1)
1853 } // end find_matching_operand()
1854
1855
1856 #ifndef PRODUCT
1857
1858 const char* ConstantPool::printable_name_at(int which) {
1859
1860 constantTag tag = tag_at(which);
1861
1862 if (tag.is_string()) {
1863 return string_at_noresolve(which);
1864 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1865 return klass_name_at(which)->as_C_string();
1866 } else if (tag.is_symbol()) {
1867 return symbol_at(which)->as_C_string();
1868 }
1869 return "";
1870 }
1871
1872 #endif // PRODUCT
1873
1874
1875 // JVMTI GetConstantPool support
1876
1877 // For debugging of constant pool
1878 const bool debug_cpool = false;
1879
1880 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1881
1882 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1883 const char* WARN_MSG = "Must not be such entry!";
1884 jint size = 0;
1885 u2 idx1, idx2;
1886
1887 for (jint idx = 1; idx < cnt; idx++) {
1888 jint ent_size = 0;
1889 u1 tag = *bytes++;
1890 size++; // count tag
1891
1892 printf("const #%03d, tag: %02d ", idx, tag);
1893 switch(tag) {
1894 case JVM_CONSTANT_Invalid: {
1895 printf("Invalid");
1896 break;
1897 }
1898 case JVM_CONSTANT_Unicode: {
1899 printf("Unicode %s", WARN_MSG);
1900 break;
1901 }
1902 case JVM_CONSTANT_Utf8: {
1903 u2 len = Bytes::get_Java_u2(bytes);
1904 char str[128];
1905 if (len > 127) {
1906 len = 127;
1907 }
1908 strncpy(str, (char *) (bytes+2), len);
1909 str[len] = '\0';
1910 printf("Utf8 \"%s\"", str);
1911 ent_size = 2 + len;
1912 break;
1913 }
1914 case JVM_CONSTANT_Integer: {
1915 u4 val = Bytes::get_Java_u4(bytes);
1916 printf("int %d", *(int *) &val);
1917 ent_size = 4;
1918 break;
1919 }
1920 case JVM_CONSTANT_Float: {
1921 u4 val = Bytes::get_Java_u4(bytes);
1922 printf("float %5.3ff", *(float *) &val);
1923 ent_size = 4;
1924 break;
1925 }
1926 case JVM_CONSTANT_Long: {
1927 u8 val = Bytes::get_Java_u8(bytes);
1928 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1929 ent_size = 8;
1930 idx++; // Long takes two cpool slots
1931 break;
1932 }
1933 case JVM_CONSTANT_Double: {
1934 u8 val = Bytes::get_Java_u8(bytes);
1935 printf("double %5.3fd", *(jdouble *)&val);
1936 ent_size = 8;
1937 idx++; // Double takes two cpool slots
1938 break;
1939 }
1940 case JVM_CONSTANT_Class: {
1941 idx1 = Bytes::get_Java_u2(bytes);
1942 printf("class #%03d", idx1);
1943 ent_size = 2;
1944 break;
1945 }
1946 case (JVM_CONSTANT_Class | JVM_CONSTANT_QDescBit): {
1947 idx1 = Bytes::get_Java_u2(bytes);
1948 printf("qclass #%03d", idx1);
1949 ent_size = 2;
1950 break;
1951 }
1952 case JVM_CONSTANT_String: {
1953 idx1 = Bytes::get_Java_u2(bytes);
1954 printf("String #%03d", idx1);
1955 ent_size = 2;
1956 break;
1957 }
1958 case JVM_CONSTANT_Fieldref: {
1959 idx1 = Bytes::get_Java_u2(bytes);
1960 idx2 = Bytes::get_Java_u2(bytes+2);
1961 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1962 ent_size = 4;
1963 break;
1964 }
1965 case JVM_CONSTANT_Methodref: {
1966 idx1 = Bytes::get_Java_u2(bytes);
1967 idx2 = Bytes::get_Java_u2(bytes+2);
1968 printf("Method #%03d, #%03d", idx1, idx2);
1969 ent_size = 4;
1970 break;
1971 }
1972 case JVM_CONSTANT_InterfaceMethodref: {
1973 idx1 = Bytes::get_Java_u2(bytes);
1974 idx2 = Bytes::get_Java_u2(bytes+2);
1975 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1976 ent_size = 4;
1977 break;
1978 }
1979 case JVM_CONSTANT_NameAndType: {
1980 idx1 = Bytes::get_Java_u2(bytes);
1981 idx2 = Bytes::get_Java_u2(bytes+2);
1982 printf("NameAndType #%03d, #%03d", idx1, idx2);
1983 ent_size = 4;
1984 break;
1985 }
1986 case JVM_CONSTANT_ClassIndex: {
1987 printf("ClassIndex %s", WARN_MSG);
1988 break;
1989 }
1990 case JVM_CONSTANT_UnresolvedClass: {
1991 printf("UnresolvedClass: %s", WARN_MSG);
1992 break;
1993 }
1994 case (JVM_CONSTANT_UnresolvedClass | JVM_CONSTANT_QDescBit): {
1995 printf("UnresolvedQClass: %s", WARN_MSG);
1996 break;
1997 }
1998 case JVM_CONSTANT_UnresolvedClassInError: {
1999 printf("UnresolvedClassInErr: %s", WARN_MSG);
2000 break;
2001 }
2002 case JVM_CONSTANT_StringIndex: {
2003 printf("StringIndex: %s", WARN_MSG);
2004 break;
2005 }
2006 }
2007 printf(";\n");
2008 bytes += ent_size;
2009 size += ent_size;
2010 }
2011 printf("Cpool size: %d\n", size);
2012 fflush(0);
2013 return;
2014 } /* end print_cpool_bytes */
2015
2016
2017 // Returns size of constant pool entry.
2018 jint ConstantPool::cpool_entry_size(jint idx) {
2019 switch(tag_at(idx).value()) {
2020 case JVM_CONSTANT_Invalid:
2021 case JVM_CONSTANT_Unicode:
2022 return 1;
2023
2024 case JVM_CONSTANT_Utf8:
2025 return 3 + symbol_at(idx)->utf8_length();
2026
2027 case JVM_CONSTANT_Class:
2028 case JVM_CONSTANT_String:
2029 case JVM_CONSTANT_ClassIndex:
2030 case JVM_CONSTANT_UnresolvedClass:
2031 case JVM_CONSTANT_UnresolvedClassInError:
2032 case JVM_CONSTANT_StringIndex:
2033 case JVM_CONSTANT_MethodType:
2034 case JVM_CONSTANT_MethodTypeInError:
2035 return 3;
2036
2037 case JVM_CONSTANT_MethodHandle:
2038 case JVM_CONSTANT_MethodHandleInError:
2039 return 4; //tag, ref_kind, ref_index
2040
2041 case JVM_CONSTANT_Integer:
2042 case JVM_CONSTANT_Float:
2043 case JVM_CONSTANT_Fieldref:
2044 case JVM_CONSTANT_Methodref:
2045 case JVM_CONSTANT_InterfaceMethodref:
2046 case JVM_CONSTANT_NameAndType:
2047 return 5;
2048
2049 case JVM_CONSTANT_Dynamic:
2050 case JVM_CONSTANT_DynamicInError:
2051 case JVM_CONSTANT_InvokeDynamic:
2052 // u1 tag, u2 bsm, u2 nt
2053 return 5;
2054
2055 case JVM_CONSTANT_Long:
2056 case JVM_CONSTANT_Double:
2057 return 9;
2058 }
2059 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
2060 return 1;
2061 } /* end cpool_entry_size */
2062
2063
2064 // SymbolHashMap is used to find a constant pool index from a string.
2065 // This function fills in SymbolHashMaps, one for utf8s and one for
2066 // class names, returns size of the cpool raw bytes.
2067 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
2068 SymbolHashMap *classmap) {
2069 jint size = 0;
2070
2071 for (u2 idx = 1; idx < length(); idx++) {
2072 u2 tag = tag_at(idx).value();
2073 size += cpool_entry_size(idx);
2074
2075 switch(tag) {
2076 case JVM_CONSTANT_Utf8: {
2077 Symbol* sym = symbol_at(idx);
2078 symmap->add_entry(sym, idx);
2079 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
2080 break;
2081 }
2082 case JVM_CONSTANT_Class:
2083 case JVM_CONSTANT_UnresolvedClass:
2084 case JVM_CONSTANT_UnresolvedClassInError: {
2085 Symbol* sym = klass_name_at(idx);
2086 classmap->add_entry(sym, idx);
2087 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
2088 break;
2089 }
2090 case JVM_CONSTANT_Long:
2091 case JVM_CONSTANT_Double: {
2092 idx++; // Both Long and Double take two cpool slots
2093 break;
2094 }
2095 }
2096 }
2097 return size;
2098 } /* end hash_utf8_entries_to */
2099
2100
2101 // Copy cpool bytes.
2102 // Returns:
2103 // 0, in case of OutOfMemoryError
2104 // -1, in case of internal error
2105 // > 0, count of the raw cpool bytes that have been copied
2106 int ConstantPool::copy_cpool_bytes(int cpool_size,
2107 SymbolHashMap* tbl,
2108 unsigned char *bytes) {
2109 u2 idx1, idx2;
2110 jint size = 0;
2111 jint cnt = length();
2112 unsigned char *start_bytes = bytes;
2113
2114 for (jint idx = 1; idx < cnt; idx++) {
2115 u1 tag = tag_at(idx).value();
2116 jint ent_size = cpool_entry_size(idx);
2117
2118 assert(size + ent_size <= cpool_size, "Size mismatch");
2119
2120 *bytes = tag;
2121 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2122 switch(tag) {
2123 case JVM_CONSTANT_Invalid: {
2124 DBG(printf("JVM_CONSTANT_Invalid"));
2125 break;
2126 }
2127 case JVM_CONSTANT_Unicode: {
2128 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2129 DBG(printf("JVM_CONSTANT_Unicode"));
2130 break;
2131 }
2132 case JVM_CONSTANT_Utf8: {
2133 Symbol* sym = symbol_at(idx);
2134 char* str = sym->as_utf8();
2135 // Warning! It's crashing on x86 with len = sym->utf8_length()
2136 int len = (int) strlen(str);
2137 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2138 for (int i = 0; i < len; i++) {
2139 bytes[3+i] = (u1) str[i];
2140 }
2141 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2142 break;
2143 }
2144 case JVM_CONSTANT_Integer: {
2145 jint val = int_at(idx);
2146 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2147 break;
2148 }
2149 case JVM_CONSTANT_Float: {
2150 jfloat val = float_at(idx);
2151 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2152 break;
2153 }
2154 case JVM_CONSTANT_Long: {
2155 jlong val = long_at(idx);
2156 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2157 idx++; // Long takes two cpool slots
2158 break;
2159 }
2160 case JVM_CONSTANT_Double: {
2161 jdouble val = double_at(idx);
2162 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2163 idx++; // Double takes two cpool slots
2164 break;
2165 }
2166 case JVM_CONSTANT_Class:
2167 case JVM_CONSTANT_UnresolvedClass:
2168 case JVM_CONSTANT_UnresolvedClassInError: {
2169 assert(!tag_at(idx).is_Qdescriptor_klass(), "Failed to encode QDesc");
2170 *bytes = JVM_CONSTANT_Class;
2171 Symbol* sym = klass_name_at(idx);
2172 idx1 = tbl->symbol_to_value(sym);
2173 assert(idx1 != 0, "Have not found a hashtable entry");
2174 Bytes::put_Java_u2((address) (bytes+1), idx1);
2175 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2176 break;
2177 }
2178 case JVM_CONSTANT_String: {
2179 *bytes = JVM_CONSTANT_String;
2180 Symbol* sym = unresolved_string_at(idx);
2181 idx1 = tbl->symbol_to_value(sym);
2182 assert(idx1 != 0, "Have not found a hashtable entry");
2183 Bytes::put_Java_u2((address) (bytes+1), idx1);
2184 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2185 break;
2186 }
2187 case JVM_CONSTANT_Fieldref:
2188 case JVM_CONSTANT_Methodref:
2189 case JVM_CONSTANT_InterfaceMethodref: {
2190 idx1 = uncached_klass_ref_index_at(idx);
2191 idx2 = uncached_name_and_type_ref_index_at(idx);
2192 Bytes::put_Java_u2((address) (bytes+1), idx1);
2193 Bytes::put_Java_u2((address) (bytes+3), idx2);
2194 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2195 break;
2196 }
2197 case JVM_CONSTANT_NameAndType: {
2198 idx1 = name_ref_index_at(idx);
2199 idx2 = signature_ref_index_at(idx);
2200 Bytes::put_Java_u2((address) (bytes+1), idx1);
2201 Bytes::put_Java_u2((address) (bytes+3), idx2);
2202 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2203 break;
2204 }
2205 case JVM_CONSTANT_ClassIndex: {
2206 *bytes = JVM_CONSTANT_Class;
2207 idx1 = klass_index_at(idx);
2208 Bytes::put_Java_u2((address) (bytes+1), idx1);
2209 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2210 break;
2211 }
2212 case JVM_CONSTANT_StringIndex: {
2213 *bytes = JVM_CONSTANT_String;
2214 idx1 = string_index_at(idx);
2215 Bytes::put_Java_u2((address) (bytes+1), idx1);
2216 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2217 break;
2218 }
2219 case JVM_CONSTANT_MethodHandle:
2220 case JVM_CONSTANT_MethodHandleInError: {
2221 *bytes = JVM_CONSTANT_MethodHandle;
2222 int kind = method_handle_ref_kind_at(idx);
2223 idx1 = method_handle_index_at(idx);
2224 *(bytes+1) = (unsigned char) kind;
2225 Bytes::put_Java_u2((address) (bytes+2), idx1);
2226 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2227 break;
2228 }
2229 case JVM_CONSTANT_MethodType:
2230 case JVM_CONSTANT_MethodTypeInError: {
2231 *bytes = JVM_CONSTANT_MethodType;
2232 idx1 = method_type_index_at(idx);
2233 Bytes::put_Java_u2((address) (bytes+1), idx1);
2234 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2235 break;
2236 }
2237 case JVM_CONSTANT_Dynamic:
2238 case JVM_CONSTANT_DynamicInError: {
2239 *bytes = tag;
2240 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2241 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2242 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2243 Bytes::put_Java_u2((address) (bytes+1), idx1);
2244 Bytes::put_Java_u2((address) (bytes+3), idx2);
2245 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2246 break;
2247 }
2248 case JVM_CONSTANT_InvokeDynamic: {
2249 *bytes = tag;
2250 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2251 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2252 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2253 Bytes::put_Java_u2((address) (bytes+1), idx1);
2254 Bytes::put_Java_u2((address) (bytes+3), idx2);
2255 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2256 break;
2257 }
2258 }
2259 DBG(printf("\n"));
2260 bytes += ent_size;
2261 size += ent_size;
2262 }
2263 assert(size == cpool_size, "Size mismatch");
2264
2265 // Keep temorarily for debugging until it's stable.
2266 DBG(print_cpool_bytes(cnt, start_bytes));
2267 return (int)(bytes - start_bytes);
2268 } /* end copy_cpool_bytes */
2269
2270 #undef DBG
2271
2272
2273 void ConstantPool::set_on_stack(const bool value) {
2274 if (value) {
2275 // Only record if it's not already set.
2276 if (!on_stack()) {
2277 assert(!is_shared(), "should always be set for shared constant pools");
2278 _flags |= _on_stack;
2279 MetadataOnStackMark::record(this);
2280 }
2281 } else {
2282 // Clearing is done single-threadedly.
2283 if (!is_shared()) {
2284 _flags &= ~_on_stack;
2285 }
2286 }
2287 }
2288
2289 // Printing
2290
2291 void ConstantPool::print_on(outputStream* st) const {
2292 assert(is_constantPool(), "must be constantPool");
2293 st->print_cr("%s", internal_name());
2294 if (flags() != 0) {
2295 st->print(" - flags: 0x%x", flags());
2296 if (has_preresolution()) st->print(" has_preresolution");
2297 if (on_stack()) st->print(" on_stack");
2298 st->cr();
2299 }
2300 if (pool_holder() != NULL) {
2301 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
2302 }
2303 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
2304 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
2305 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
2306 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
2307
2308 for (int index = 1; index < length(); index++) { // Index 0 is unused
2309 ((ConstantPool*)this)->print_entry_on(index, st);
2310 switch (tag_at(index).value()) {
2311 case JVM_CONSTANT_Long :
2312 case JVM_CONSTANT_Double :
2313 index++; // Skip entry following eigth-byte constant
2314 }
2315
2316 }
2317 st->cr();
2318 }
2319
2320 // Print one constant pool entry
2321 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2322 EXCEPTION_MARK;
2323 st->print(" - %3d : ", index);
2324 tag_at(index).print_on(st);
2325 st->print(" : ");
2326 switch (tag_at(index).value()) {
2327 case JVM_CONSTANT_Class :
2328 { Klass* k = klass_at(index, CATCH);
2329 guarantee(k != NULL, "need klass");
2330 k->print_value_on(st);
2331 st->print(" {" PTR_FORMAT "}", p2i(k));
2332 }
2333 break;
2334 case JVM_CONSTANT_Fieldref :
2335 case JVM_CONSTANT_Methodref :
2336 case JVM_CONSTANT_InterfaceMethodref :
2337 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2338 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2339 break;
2340 case JVM_CONSTANT_String :
2341 unresolved_string_at(index)->print_value_on(st);
2342 break;
2343 case JVM_CONSTANT_Integer :
2344 st->print("%d", int_at(index));
2345 break;
2346 case JVM_CONSTANT_Float :
2347 st->print("%f", float_at(index));
2348 break;
2349 case JVM_CONSTANT_Long :
2350 st->print_jlong(long_at(index));
2351 break;
2352 case JVM_CONSTANT_Double :
2353 st->print("%lf", double_at(index));
2354 break;
2355 case JVM_CONSTANT_NameAndType :
2356 st->print("name_index=%d", name_ref_index_at(index));
2357 st->print(" signature_index=%d", signature_ref_index_at(index));
2358 break;
2359 case JVM_CONSTANT_Utf8 :
2360 symbol_at(index)->print_value_on(st);
2361 break;
2362 case JVM_CONSTANT_ClassIndex: {
2363 int name_index = *int_at_addr(index);
2364 st->print("klass_index=%d ", name_index);
2365 symbol_at(name_index)->print_value_on(st);
2366 }
2367 break;
2368 case JVM_CONSTANT_UnresolvedClass : // fall-through
2369 case JVM_CONSTANT_UnresolvedClassInError: {
2370 CPKlassSlot kslot = klass_slot_at(index);
2371 int resolved_klass_index = kslot.resolved_klass_index();
2372 int name_index = kslot.name_index();
2373 assert(tag_at(name_index).is_symbol(), "sanity");
2374 symbol_at(name_index)->print_value_on(st);
2375 }
2376 break;
2377 case JVM_CONSTANT_MethodHandle :
2378 case JVM_CONSTANT_MethodHandleInError :
2379 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2380 st->print(" ref_index=%d", method_handle_index_at(index));
2381 break;
2382 case JVM_CONSTANT_MethodType :
2383 case JVM_CONSTANT_MethodTypeInError :
2384 st->print("signature_index=%d", method_type_index_at(index));
2385 break;
2386 case JVM_CONSTANT_Dynamic :
2387 case JVM_CONSTANT_DynamicInError :
2388 {
2389 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2390 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2391 int argc = bootstrap_argument_count_at(index);
2392 if (argc > 0) {
2393 for (int arg_i = 0; arg_i < argc; arg_i++) {
2394 int arg = bootstrap_argument_index_at(index, arg_i);
2395 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2396 }
2397 st->print("}");
2398 }
2399 }
2400 break;
2401 case JVM_CONSTANT_InvokeDynamic :
2402 {
2403 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2404 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2405 int argc = bootstrap_argument_count_at(index);
2406 if (argc > 0) {
2407 for (int arg_i = 0; arg_i < argc; arg_i++) {
2408 int arg = bootstrap_argument_index_at(index, arg_i);
2409 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2410 }
2411 st->print("}");
2412 }
2413 }
2414 break;
2415 default:
2416 ShouldNotReachHere();
2417 break;
2418 }
2419 st->cr();
2420 }
2421
2422 void ConstantPool::print_value_on(outputStream* st) const {
2423 assert(is_constantPool(), "must be constantPool");
2424 st->print("constant pool [%d]", length());
2425 if (has_preresolution()) st->print("/preresolution");
2426 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2427 print_address_on(st);
2428 if (pool_holder() != NULL) {
2429 st->print(" for ");
2430 pool_holder()->print_value_on(st);
2431 bool extra = (pool_holder()->constants() != this);
2432 if (extra) st->print(" (extra)");
2433 }
2434 if (cache() != NULL) {
2435 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2436 }
2437 }
2438
2439 // Verification
2440
2441 void ConstantPool::verify_on(outputStream* st) {
2442 guarantee(is_constantPool(), "object must be constant pool");
2443 for (int i = 0; i< length(); i++) {
2444 constantTag tag = tag_at(i);
2445 if (tag.is_klass() || tag.is_unresolved_klass()) {
2446 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2447 } else if (tag.is_symbol()) {
2448 Symbol* entry = symbol_at(i);
2449 guarantee(entry->refcount() != 0, "should have nonzero reference count");
2450 } else if (tag.is_string()) {
2451 Symbol* entry = unresolved_string_at(i);
2452 guarantee(entry->refcount() != 0, "should have nonzero reference count");
2453 }
2454 }
2455 if (pool_holder() != NULL) {
2456 // Note: pool_holder() can be NULL in temporary constant pools
2457 // used during constant pool merging
2458 guarantee(pool_holder()->is_klass(), "should be klass");
2459 }
2460 }
2461
2462
2463 SymbolHashMap::~SymbolHashMap() {
2464 SymbolHashMapEntry* next;
2465 for (int i = 0; i < _table_size; i++) {
2466 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
2467 next = cur->next();
2468 delete(cur);
2469 }
2470 }
2471 FREE_C_HEAP_ARRAY(SymbolHashMapBucket, _buckets);
2472 }
2473
2474 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2475 char *str = sym->as_utf8();
2476 unsigned int hash = compute_hash(str, sym->utf8_length());
2477 unsigned int index = hash % table_size();
2478
2479 // check if already in map
2480 // we prefer the first entry since it is more likely to be what was used in
2481 // the class file
2482 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2483 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2484 if (en->hash() == hash && en->symbol() == sym) {
2485 return; // already there
2486 }
2487 }
2488
2489 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2490 entry->set_next(bucket(index));
2491 _buckets[index].set_entry(entry);
2492 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2493 }
2494
2495 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2496 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2497 char *str = sym->as_utf8();
2498 int len = sym->utf8_length();
2499 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2500 unsigned int index = hash % table_size();
2501 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2502 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2503 if (en->hash() == hash && en->symbol() == sym) {
2504 return en;
2505 }
2506 }
2507 return NULL;
2508 }
2509
2510 void SymbolHashMap::initialize_table(int table_size) {
2511 _table_size = table_size;
2512 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
2513 for (int index = 0; index < table_size; index++) {
2514 _buckets[index].clear();
2515 }
2516 }