1/*
2 * Copyright (c) 1997, 2019, 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.
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23 */
24
25#include "precompiled.hpp"
26#include "jvm.h"
27#include "classfile/classLoaderData.hpp"
28#include "classfile/javaClasses.inline.hpp"
29#include "classfile/metadataOnStackMark.hpp"
30#include "classfile/stringTable.hpp"
31#include "classfile/systemDictionary.hpp"
32#include "classfile/vmSymbols.hpp"
33#include "interpreter/bootstrapInfo.hpp"
34#include "interpreter/linkResolver.hpp"
35#include "memory/allocation.inline.hpp"
36#include "memory/heapInspection.hpp"
37#include "memory/heapShared.hpp"
38#include "memory/metadataFactory.hpp"
39#include "memory/metaspaceClosure.hpp"
40#include "memory/metaspaceShared.hpp"
41#include "memory/oopFactory.hpp"
42#include "memory/resourceArea.hpp"
43#include "memory/universe.hpp"
44#include "oops/array.hpp"
45#include "oops/constantPool.inline.hpp"
46#include "oops/cpCache.inline.hpp"
47#include "oops/instanceKlass.hpp"
48#include "oops/objArrayKlass.hpp"
49#include "oops/objArrayOop.inline.hpp"
50#include "oops/oop.inline.hpp"
51#include "oops/typeArrayOop.inline.hpp"
52#include "runtime/fieldType.hpp"
53#include "runtime/handles.inline.hpp"
54#include "runtime/init.hpp"
55#include "runtime/javaCalls.hpp"
56#include "runtime/signature.hpp"
57#include "runtime/thread.inline.hpp"
58#include "runtime/vframe.inline.hpp"
59#include "utilities/copy.hpp"
60
61ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
62 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
63 int size = ConstantPool::size(length);
64 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
65}
66
67#ifdef ASSERT
68
69// MetaspaceObj allocation invariant is calloc equivalent memory
70// simple verification of this here (JVM_CONSTANT_Invalid == 0 )
71static bool tag_array_is_zero_initialized(Array<u1>* tags) {
72 assert(tags != NULL, "invariant");
73 const int length = tags->length();
74 for (int index = 0; index < length; ++index) {
75 if (JVM_CONSTANT_Invalid != tags->at(index)) {
76 return false;
77 }
78 }
79 return true;
80}
81
82#endif
83
84ConstantPool::ConstantPool(Array<u1>* tags) :
85 _tags(tags),
86 _length(tags->length()) {
87
88 assert(_tags != NULL, "invariant");
89 assert(tags->length() == _length, "invariant");
90 assert(tag_array_is_zero_initialized(tags), "invariant");
91 assert(0 == flags(), "invariant");
92 assert(0 == version(), "invariant");
93 assert(NULL == _pool_holder, "invariant");
94}
95
96void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
97 if (cache() != NULL) {
98 MetadataFactory::free_metadata(loader_data, cache());
99 set_cache(NULL);
100 }
101
102 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
103 set_resolved_klasses(NULL);
104
105 MetadataFactory::free_array<jushort>(loader_data, operands());
106 set_operands(NULL);
107
108 release_C_heap_structures();
109
110 // free tag array
111 MetadataFactory::free_array<u1>(loader_data, tags());
112 set_tags(NULL);
113}
114
115void ConstantPool::release_C_heap_structures() {
116 // walk constant pool and decrement symbol reference counts
117 unreference_symbols();
118}
119
120void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
121 log_trace(cds)("Iter(ConstantPool): %p", this);
122
123 it->push(&_tags, MetaspaceClosure::_writable);
124 it->push(&_cache);
125 it->push(&_pool_holder);
126 it->push(&_operands);
127 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
128
129 for (int i = 0; i < length(); i++) {
130 // The only MSO's embedded in the CP entries are Symbols:
131 // JVM_CONSTANT_String (normal and pseudo)
132 // JVM_CONSTANT_Utf8
133 constantTag ctag = tag_at(i);
134 if (ctag.is_string() || ctag.is_utf8()) {
135 it->push(symbol_at_addr(i));
136 }
137 }
138}
139
140objArrayOop ConstantPool::resolved_references() const {
141 return (objArrayOop)_cache->resolved_references();
142}
143
144// Called from outside constant pool resolution where a resolved_reference array
145// may not be present.
146objArrayOop ConstantPool::resolved_references_or_null() const {
147 if (_cache == NULL) {
148 return NULL;
149 } else {
150 return (objArrayOop)_cache->resolved_references();
151 }
152}
153
154// Create resolved_references array and mapping array for original cp indexes
155// The ldc bytecode was rewritten to have the resolved reference array index so need a way
156// to map it back for resolving and some unlikely miscellaneous uses.
157// The objects created by invokedynamic are appended to this list.
158void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
159 const intStack& reference_map,
160 int constant_pool_map_length,
161 TRAPS) {
162 // Initialized the resolved object cache.
163 int map_length = reference_map.length();
164 if (map_length > 0) {
165 // Only need mapping back to constant pool entries. The map isn't used for
166 // invokedynamic resolved_reference entries. For invokedynamic entries,
167 // the constant pool cache index has the mapping back to both the constant
168 // pool and to the resolved reference index.
169 if (constant_pool_map_length > 0) {
170 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
171
172 for (int i = 0; i < constant_pool_map_length; i++) {
173 int x = reference_map.at(i);
174 assert(x == (int)(jushort) x, "klass index is too big");
175 om->at_put(i, (jushort)x);
176 }
177 set_reference_map(om);
178 }
179
180 // Create Java array for holding resolved strings, methodHandles,
181 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
182 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
183 Handle refs_handle (THREAD, (oop)stom); // must handleize.
184 set_resolved_references(loader_data->add_handle(refs_handle));
185 }
186}
187
188void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
189 // A ConstantPool can't possibly have 0xffff valid class entries,
190 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
191 // entry for the class's name. So at most we will have 0xfffe class entries.
192 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
193 // UnresolvedKlass entries that are temporarily created during class redefinition.
194 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
195 assert(resolved_klasses() == NULL, "sanity");
196 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
197 set_resolved_klasses(rk);
198}
199
200void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
201 int len = length();
202 int num_klasses = 0;
203 for (int i = 1; i <len; i++) {
204 switch (tag_at(i).value()) {
205 case JVM_CONSTANT_ClassIndex:
206 {
207 const int class_index = klass_index_at(i);
208 unresolved_klass_at_put(i, class_index, num_klasses++);
209 }
210 break;
211#ifndef PRODUCT
212 case JVM_CONSTANT_Class:
213 case JVM_CONSTANT_UnresolvedClass:
214 case JVM_CONSTANT_UnresolvedClassInError:
215 // All of these should have been reverted back to ClassIndex before calling
216 // this function.
217 ShouldNotReachHere();
218#endif
219 }
220 }
221 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
222}
223
224// Unsafe anonymous class support:
225void ConstantPool::klass_at_put(int class_index, int name_index, int resolved_klass_index, Klass* k, Symbol* name) {
226 assert(is_within_bounds(class_index), "index out of bounds");
227 assert(is_within_bounds(name_index), "index out of bounds");
228 assert((resolved_klass_index & 0xffff0000) == 0, "must be");
229 *int_at_addr(class_index) =
230 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index);
231
232 symbol_at_put(name_index, name);
233 name->increment_refcount();
234 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
235 OrderAccess::release_store(adr, k);
236
237 // The interpreter assumes when the tag is stored, the klass is resolved
238 // and the Klass* non-NULL, so we need hardware store ordering here.
239 if (k != NULL) {
240 release_tag_at_put(class_index, JVM_CONSTANT_Class);
241 } else {
242 release_tag_at_put(class_index, JVM_CONSTANT_UnresolvedClass);
243 }
244}
245
246// Unsafe anonymous class support:
247void ConstantPool::klass_at_put(int class_index, Klass* k) {
248 assert(k != NULL, "must be valid klass");
249 CPKlassSlot kslot = klass_slot_at(class_index);
250 int resolved_klass_index = kslot.resolved_klass_index();
251 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
252 OrderAccess::release_store(adr, k);
253
254 // The interpreter assumes when the tag is stored, the klass is resolved
255 // and the Klass* non-NULL, so we need hardware store ordering here.
256 release_tag_at_put(class_index, JVM_CONSTANT_Class);
257}
258
259#if INCLUDE_CDS_JAVA_HEAP
260// Archive the resolved references
261void ConstantPool::archive_resolved_references(Thread* THREAD) {
262 if (_cache == NULL) {
263 return; // nothing to do
264 }
265
266 InstanceKlass *ik = pool_holder();
267 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() ||
268 ik->is_shared_app_class())) {
269 // Archiving resolved references for classes from non-builtin loaders
270 // is not yet supported.
271 set_resolved_references(NULL);
272 return;
273 }
274
275 objArrayOop rr = resolved_references();
276 Array<u2>* ref_map = reference_map();
277 if (rr != NULL) {
278 int ref_map_len = ref_map == NULL ? 0 : ref_map->length();
279 int rr_len = rr->length();
280 for (int i = 0; i < rr_len; i++) {
281 oop p = rr->obj_at(i);
282 rr->obj_at_put(i, NULL);
283 if (p != NULL && i < ref_map_len) {
284 int index = object_to_cp_index(i);
285 if (tag_at(index).is_string()) {
286 oop op = StringTable::create_archived_string(p, THREAD);
287 // If the String object is not archived (possibly too large),
288 // NULL is returned. Also set it in the array, so we won't
289 // have a 'bad' reference in the archived resolved_reference
290 // array.
291 rr->obj_at_put(i, op);
292 }
293 }
294 }
295
296 oop archived = HeapShared::archive_heap_object(rr, THREAD);
297 // If the resolved references array is not archived (too large),
298 // the 'archived' object is NULL. No need to explicitly check
299 // the return value of archive_heap_object here. At runtime, the
300 // resolved references will be created using the normal process
301 // when there is no archived value.
302 _cache->set_archived_references(archived);
303 set_resolved_references(NULL);
304 }
305}
306
307void ConstantPool::resolve_class_constants(TRAPS) {
308 assert(DumpSharedSpaces, "used during dump time only");
309 // The _cache may be NULL if the _pool_holder klass fails verification
310 // at dump time due to missing dependencies.
311 if (cache() == NULL || reference_map() == NULL) {
312 return; // nothing to do
313 }
314
315 constantPoolHandle cp(THREAD, this);
316 for (int index = 1; index < length(); index++) { // Index 0 is unused
317 if (tag_at(index).is_string() && !cp->is_pseudo_string_at(index)) {
318 int cache_index = cp->cp_to_object_index(index);
319 string_at_impl(cp, index, cache_index, CHECK);
320 }
321 }
322}
323#endif
324
325// CDS support. Create a new resolved_references array.
326void ConstantPool::restore_unshareable_info(TRAPS) {
327 assert(is_constantPool(), "ensure C++ vtable is restored");
328 assert(on_stack(), "should always be set for shared constant pools");
329 assert(is_shared(), "should always be set for shared constant pools");
330 assert(_cache != NULL, "constant pool _cache should not be NULL");
331
332 // Only create the new resolved references array if it hasn't been attempted before
333 if (resolved_references() != NULL) return;
334
335 // restore the C++ vtable from the shared archive
336 restore_vtable();
337
338 if (SystemDictionary::Object_klass_loaded()) {
339 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
340#if INCLUDE_CDS_JAVA_HEAP
341 if (HeapShared::open_archive_heap_region_mapped() &&
342 _cache->archived_references() != NULL) {
343 oop archived = _cache->archived_references();
344 // Create handle for the archived resolved reference array object
345 Handle refs_handle(THREAD, archived);
346 set_resolved_references(loader_data->add_handle(refs_handle));
347 } else
348#endif
349 {
350 // No mapped archived resolved reference array
351 // Recreate the object array and add to ClassLoaderData.
352 int map_length = resolved_reference_length();
353 if (map_length > 0) {
354 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
355 Handle refs_handle(THREAD, (oop)stom); // must handleize.
356 set_resolved_references(loader_data->add_handle(refs_handle));
357 }
358 }
359 }
360}
361
362void ConstantPool::remove_unshareable_info() {
363 // Resolved references are not in the shared archive.
364 // Save the length for restoration. It is not necessarily the same length
365 // as reference_map.length() if invokedynamic is saved. It is needed when
366 // re-creating the resolved reference array if archived heap data cannot be map
367 // at runtime.
368 set_resolved_reference_length(
369 resolved_references() != NULL ? resolved_references()->length() : 0);
370
371 // If archiving heap objects is not allowed, clear the resolved references.
372 // Otherwise, it is cleared after the resolved references array is cached
373 // (see archive_resolved_references()).
374 // If DynamicDumpSharedSpaces is enabled, clear the resolved references also
375 // as java objects are not archived in the top layer.
376 if (!HeapShared::is_heap_object_archiving_allowed() || DynamicDumpSharedSpaces) {
377 set_resolved_references(NULL);
378 }
379
380 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
381 // The _on_stack flag is used to prevent ConstantPools from deallocation during
382 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
383 // we always set _on_stack to true to avoid having to change _flags during runtime.
384 _flags |= (_on_stack | _is_shared);
385 int num_klasses = 0;
386 for (int index = 1; index < length(); index++) { // Index 0 is unused
387 if (!DynamicDumpSharedSpaces) {
388 assert(!tag_at(index).is_unresolved_klass_in_error(), "This must not happen during static dump time");
389 } else {
390 if (tag_at(index).is_unresolved_klass_in_error() ||
391 tag_at(index).is_method_handle_in_error() ||
392 tag_at(index).is_method_type_in_error() ||
393 tag_at(index).is_dynamic_constant_in_error()) {
394 tag_at_put(index, JVM_CONSTANT_UnresolvedClass);
395 }
396 }
397 if (tag_at(index).is_klass()) {
398 // This class was resolved as a side effect of executing Java code
399 // during dump time. We need to restore it back to an UnresolvedClass,
400 // so that the proper class loading and initialization can happen
401 // at runtime.
402 CPKlassSlot kslot = klass_slot_at(index);
403 int resolved_klass_index = kslot.resolved_klass_index();
404 int name_index = kslot.name_index();
405 assert(tag_at(name_index).is_symbol(), "sanity");
406 resolved_klasses()->at_put(resolved_klass_index, NULL);
407 tag_at_put(index, JVM_CONSTANT_UnresolvedClass);
408 assert(klass_name_at(index) == symbol_at(name_index), "sanity");
409 }
410 }
411 if (cache() != NULL) {
412 cache()->remove_unshareable_info();
413 }
414}
415
416int ConstantPool::cp_to_object_index(int cp_index) {
417 // this is harder don't do this so much.
418 int i = reference_map()->find(cp_index);
419 // We might not find the index for jsr292 call.
420 return (i < 0) ? _no_index_sentinel : i;
421}
422
423void ConstantPool::string_at_put(int which, int obj_index, oop str) {
424 resolved_references()->obj_at_put(obj_index, str);
425}
426
427void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
428 ResourceMark rm;
429 int line_number = -1;
430 const char * source_file = NULL;
431 if (JavaThread::current()->has_last_Java_frame()) {
432 // try to identify the method which called this function.
433 vframeStream vfst(JavaThread::current());
434 if (!vfst.at_end()) {
435 line_number = vfst.method()->line_number_from_bci(vfst.bci());
436 Symbol* s = vfst.method()->method_holder()->source_file_name();
437 if (s != NULL) {
438 source_file = s->as_C_string();
439 }
440 }
441 }
442 if (k != this_cp->pool_holder()) {
443 // only print something if the classes are different
444 if (source_file != NULL) {
445 log_debug(class, resolve)("%s %s %s:%d",
446 this_cp->pool_holder()->external_name(),
447 k->external_name(), source_file, line_number);
448 } else {
449 log_debug(class, resolve)("%s %s",
450 this_cp->pool_holder()->external_name(),
451 k->external_name());
452 }
453 }
454}
455
456Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
457 bool save_resolution_error, TRAPS) {
458 assert(THREAD->is_Java_thread(), "must be a Java thread");
459 JavaThread* javaThread = (JavaThread*)THREAD;
460
461 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
462 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
463 // the entry and tag is not updated atomicly.
464 CPKlassSlot kslot = this_cp->klass_slot_at(which);
465 int resolved_klass_index = kslot.resolved_klass_index();
466 int name_index = kslot.name_index();
467 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
468
469 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
470 if (klass != NULL) {
471 return klass;
472 }
473
474 // This tag doesn't change back to unresolved class unless at a safepoint.
475 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
476 // The original attempt to resolve this constant pool entry failed so find the
477 // class of the original error and throw another error of the same class
478 // (JVMS 5.4.3).
479 // If there is a detail message, pass that detail message to the error.
480 // The JVMS does not strictly require us to duplicate the same detail message,
481 // or any internal exception fields such as cause or stacktrace. But since the
482 // detail message is often a class name or other literal string, we will repeat it
483 // if we can find it in the symbol table.
484 throw_resolution_error(this_cp, which, CHECK_NULL);
485 ShouldNotReachHere();
486 }
487
488 Handle mirror_handle;
489 Symbol* name = this_cp->symbol_at(name_index);
490 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
491 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
492
493 Klass* k;
494 {
495 // Turn off the single stepping while doing class resolution
496 JvmtiHideSingleStepping jhss(javaThread);
497 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
498 } // JvmtiHideSingleStepping jhss(javaThread);
499
500 if (!HAS_PENDING_EXCEPTION) {
501 // preserve the resolved klass from unloading
502 mirror_handle = Handle(THREAD, k->java_mirror());
503 // Do access check for klasses
504 verify_constant_pool_resolve(this_cp, k, THREAD);
505 }
506
507 // Failed to resolve class. We must record the errors so that subsequent attempts
508 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
509 if (HAS_PENDING_EXCEPTION) {
510 if (save_resolution_error) {
511 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
512 // If CHECK_NULL above doesn't return the exception, that means that
513 // some other thread has beaten us and has resolved the class.
514 // To preserve old behavior, we return the resolved class.
515 klass = this_cp->resolved_klasses()->at(resolved_klass_index);
516 assert(klass != NULL, "must be resolved if exception was cleared");
517 return klass;
518 } else {
519 return NULL; // return the pending exception
520 }
521 }
522
523 // logging for class+resolve.
524 if (log_is_enabled(Debug, class, resolve)){
525 trace_class_resolution(this_cp, k);
526 }
527 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
528 OrderAccess::release_store(adr, k);
529 // The interpreter assumes when the tag is stored, the klass is resolved
530 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
531 // hardware store ordering here.
532 this_cp->release_tag_at_put(which, JVM_CONSTANT_Class);
533 return k;
534}
535
536
537// Does not update ConstantPool* - to avoid any exception throwing. Used
538// by compiler and exception handling. Also used to avoid classloads for
539// instanceof operations. Returns NULL if the class has not been loaded or
540// if the verification of constant pool failed
541Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
542 CPKlassSlot kslot = this_cp->klass_slot_at(which);
543 int resolved_klass_index = kslot.resolved_klass_index();
544 int name_index = kslot.name_index();
545 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
546
547 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
548 if (k != NULL) {
549 return k;
550 } else {
551 Thread *thread = Thread::current();
552 Symbol* name = this_cp->symbol_at(name_index);
553 oop loader = this_cp->pool_holder()->class_loader();
554 oop protection_domain = this_cp->pool_holder()->protection_domain();
555 Handle h_prot (thread, protection_domain);
556 Handle h_loader (thread, loader);
557 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
558
559 if (k != NULL) {
560 // Make sure that resolving is legal
561 EXCEPTION_MARK;
562 // return NULL if verification fails
563 verify_constant_pool_resolve(this_cp, k, THREAD);
564 if (HAS_PENDING_EXCEPTION) {
565 CLEAR_PENDING_EXCEPTION;
566 return NULL;
567 }
568 return k;
569 } else {
570 return k;
571 }
572 }
573}
574
575Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
576 int which) {
577 if (cpool->cache() == NULL) return NULL; // nothing to load yet
578 int cache_index = decode_cpcache_index(which, true);
579 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
580 // FIXME: should be an assert
581 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
582 return NULL;
583 }
584 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
585 return e->method_if_resolved(cpool);
586}
587
588
589bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
590 if (cpool->cache() == NULL) return false; // nothing to load yet
591 int cache_index = decode_cpcache_index(which, true);
592 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
593 return e->has_appendix();
594}
595
596oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
597 if (cpool->cache() == NULL) return NULL; // nothing to load yet
598 int cache_index = decode_cpcache_index(which, true);
599 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
600 return e->appendix_if_resolved(cpool);
601}
602
603
604bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) {
605 if (cpool->cache() == NULL) return false; // nothing to load yet
606 int cache_index = decode_cpcache_index(which, true);
607 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
608 return e->has_local_signature();
609}
610
611Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
612 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
613 return symbol_at(name_index);
614}
615
616
617Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
618 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
619 return symbol_at(signature_index);
620}
621
622int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
623 int i = which;
624 if (!uncached && cache() != NULL) {
625 if (ConstantPool::is_invokedynamic_index(which)) {
626 // Invokedynamic index is index into the constant pool cache
627 int pool_index = invokedynamic_bootstrap_ref_index_at(which);
628 pool_index = bootstrap_name_and_type_ref_index_at(pool_index);
629 assert(tag_at(pool_index).is_name_and_type(), "");
630 return pool_index;
631 }
632 // change byte-ordering and go via cache
633 i = remap_instruction_operand_from_cache(which);
634 } else {
635 if (tag_at(which).has_bootstrap()) {
636 int pool_index = bootstrap_name_and_type_ref_index_at(which);
637 assert(tag_at(pool_index).is_name_and_type(), "");
638 return pool_index;
639 }
640 }
641 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
642 assert(!tag_at(i).has_bootstrap(), "Must be handled above");
643 jint ref_index = *int_at_addr(i);
644 return extract_high_short_from_int(ref_index);
645}
646
647constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
648 int pool_index = which;
649 if (!uncached && cache() != NULL) {
650 if (ConstantPool::is_invokedynamic_index(which)) {
651 // Invokedynamic index is index into resolved_references
652 pool_index = invokedynamic_bootstrap_ref_index_at(which);
653 } else {
654 // change byte-ordering and go via cache
655 pool_index = remap_instruction_operand_from_cache(which);
656 }
657 }
658 return tag_at(pool_index);
659}
660
661int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
662 guarantee(!ConstantPool::is_invokedynamic_index(which),
663 "an invokedynamic instruction does not have a klass");
664 int i = which;
665 if (!uncached && cache() != NULL) {
666 // change byte-ordering and go via cache
667 i = remap_instruction_operand_from_cache(which);
668 }
669 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
670 jint ref_index = *int_at_addr(i);
671 return extract_low_short_from_int(ref_index);
672}
673
674
675
676int ConstantPool::remap_instruction_operand_from_cache(int operand) {
677 int cpc_index = operand;
678 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
679 assert((int)(u2)cpc_index == cpc_index, "clean u2");
680 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
681 return member_index;
682}
683
684
685void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
686 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
687 return; // short cut, typeArray klass is always accessible
688 }
689 Klass* holder = this_cp->pool_holder();
690 bool fold_type_to_class = true;
691 LinkResolver::check_klass_accessability(holder, k, fold_type_to_class, CHECK);
692}
693
694
695int ConstantPool::name_ref_index_at(int which_nt) {
696 jint ref_index = name_and_type_at(which_nt);
697 return extract_low_short_from_int(ref_index);
698}
699
700
701int ConstantPool::signature_ref_index_at(int which_nt) {
702 jint ref_index = name_and_type_at(which_nt);
703 return extract_high_short_from_int(ref_index);
704}
705
706
707Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
708 return klass_at(klass_ref_index_at(which), THREAD);
709}
710
711Symbol* ConstantPool::klass_name_at(int which) const {
712 return symbol_at(klass_slot_at(which).name_index());
713}
714
715Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
716 jint ref_index = klass_ref_index_at(which);
717 return klass_at_noresolve(ref_index);
718}
719
720Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
721 jint ref_index = uncached_klass_ref_index_at(which);
722 return klass_at_noresolve(ref_index);
723}
724
725char* ConstantPool::string_at_noresolve(int which) {
726 return unresolved_string_at(which)->as_C_string();
727}
728
729BasicType ConstantPool::basic_type_for_signature_at(int which) const {
730 return FieldType::basic_type(symbol_at(which));
731}
732
733
734void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
735 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
736 if (this_cp->tag_at(index).is_string()) {
737 this_cp->string_at(index, CHECK);
738 }
739 }
740}
741
742Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
743 // Dig out the detailed message to reuse if possible
744 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
745 if (message != NULL) {
746 return message;
747 }
748
749 // Return specific message for the tag
750 switch (tag.value()) {
751 case JVM_CONSTANT_UnresolvedClass:
752 // return the class name in the error message
753 message = this_cp->klass_name_at(which);
754 break;
755 case JVM_CONSTANT_MethodHandle:
756 // return the method handle name in the error message
757 message = this_cp->method_handle_name_ref_at(which);
758 break;
759 case JVM_CONSTANT_MethodType:
760 // return the method type signature in the error message
761 message = this_cp->method_type_signature_at(which);
762 break;
763 default:
764 ShouldNotReachHere();
765 }
766
767 return message;
768}
769
770void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
771 Symbol* message = NULL;
772 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
773 assert(error != NULL, "checking");
774 CLEAR_PENDING_EXCEPTION;
775 if (message != NULL) {
776 ResourceMark rm;
777 THROW_MSG(error, message->as_C_string());
778 } else {
779 THROW(error);
780 }
781}
782
783// If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
784// exception in the resolution error table, so that the same exception is thrown again.
785void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
786 constantTag tag, TRAPS) {
787 Symbol* error = PENDING_EXCEPTION->klass()->name();
788
789 int error_tag = tag.error_value();
790
791 if (!PENDING_EXCEPTION->
792 is_a(SystemDictionary::LinkageError_klass())) {
793 // Just throw the exception and don't prevent these classes from
794 // being loaded due to virtual machine errors like StackOverflow
795 // and OutOfMemoryError, etc, or if the thread was hit by stop()
796 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
797 } else if (this_cp->tag_at(which).value() != error_tag) {
798 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
799 SystemDictionary::add_resolution_error(this_cp, which, error, message);
800 // CAS in the tag. If a thread beat us to registering this error that's fine.
801 // If another thread resolved the reference, this is a race condition. This
802 // thread may have had a security manager or something temporary.
803 // This doesn't deterministically get an error. So why do we save this?
804 // We save this because jvmti can add classes to the bootclass path after
805 // this error, so it needs to get the same error if the error is first.
806 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
807 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
808 if (old_tag != error_tag && old_tag != tag.value()) {
809 // MethodHandles and MethodType doesn't change to resolved version.
810 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
811 // Forget the exception and use the resolved class.
812 CLEAR_PENDING_EXCEPTION;
813 }
814 } else {
815 // some other thread put this in error state
816 throw_resolution_error(this_cp, which, CHECK);
817 }
818}
819
820constantTag ConstantPool::constant_tag_at(int which) {
821 constantTag tag = tag_at(which);
822 if (tag.is_dynamic_constant() ||
823 tag.is_dynamic_constant_in_error()) {
824 BasicType bt = basic_type_for_constant_at(which);
825 // dynamic constant could return an array, treat as object
826 return constantTag::ofBasicType(is_reference_type(bt) ? T_OBJECT : bt);
827 }
828 return tag;
829}
830
831BasicType ConstantPool::basic_type_for_constant_at(int which) {
832 constantTag tag = tag_at(which);
833 if (tag.is_dynamic_constant() ||
834 tag.is_dynamic_constant_in_error()) {
835 // have to look at the signature for this one
836 Symbol* constant_type = uncached_signature_ref_at(which);
837 return FieldType::basic_type(constant_type);
838 }
839 return tag.basic_type();
840}
841
842// Called to resolve constants in the constant pool and return an oop.
843// Some constant pool entries cache their resolved oop. This is also
844// called to create oops from constants to use in arguments for invokedynamic
845oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
846 int index, int cache_index,
847 bool* status_return, TRAPS) {
848 oop result_oop = NULL;
849 Handle throw_exception;
850
851 if (cache_index == _possible_index_sentinel) {
852 // It is possible that this constant is one which is cached in the objects.
853 // We'll do a linear search. This should be OK because this usage is rare.
854 // FIXME: If bootstrap specifiers stress this code, consider putting in
855 // a reverse index. Binary search over a short array should do it.
856 assert(index > 0, "valid index");
857 cache_index = this_cp->cp_to_object_index(index);
858 }
859 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
860 assert(index == _no_index_sentinel || index >= 0, "");
861
862 if (cache_index >= 0) {
863 result_oop = this_cp->resolved_references()->obj_at(cache_index);
864 if (result_oop != NULL) {
865 if (oopDesc::equals(result_oop, Universe::the_null_sentinel())) {
866 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index)));
867 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
868 result_oop = NULL;
869 }
870 if (status_return != NULL) (*status_return) = true;
871 return result_oop;
872 // That was easy...
873 }
874 index = this_cp->object_to_cp_index(cache_index);
875 }
876
877 jvalue prim_value; // temp used only in a few cases below
878
879 constantTag tag = this_cp->tag_at(index);
880
881 if (status_return != NULL) {
882 // don't trigger resolution if the constant might need it
883 switch (tag.value()) {
884 case JVM_CONSTANT_Class:
885 {
886 CPKlassSlot kslot = this_cp->klass_slot_at(index);
887 int resolved_klass_index = kslot.resolved_klass_index();
888 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) {
889 (*status_return) = false;
890 return NULL;
891 }
892 // the klass is waiting in the CP; go get it
893 break;
894 }
895 case JVM_CONSTANT_String:
896 case JVM_CONSTANT_Integer:
897 case JVM_CONSTANT_Float:
898 case JVM_CONSTANT_Long:
899 case JVM_CONSTANT_Double:
900 // these guys trigger OOM at worst
901 break;
902 default:
903 (*status_return) = false;
904 return NULL;
905 }
906 // from now on there is either success or an OOME
907 (*status_return) = true;
908 }
909
910 switch (tag.value()) {
911
912 case JVM_CONSTANT_UnresolvedClass:
913 case JVM_CONSTANT_UnresolvedClassInError:
914 case JVM_CONSTANT_Class:
915 {
916 assert(cache_index == _no_index_sentinel, "should not have been set");
917 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
918 // ldc wants the java mirror.
919 result_oop = resolved->java_mirror();
920 break;
921 }
922
923 case JVM_CONSTANT_Dynamic:
924 {
925 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
926 BootstrapInfo bootstrap_specifier(this_cp, index);
927
928 // The initial step in resolving an unresolved symbolic reference to a
929 // dynamically-computed constant is to resolve the symbolic reference to a
930 // method handle which will be the bootstrap method for the dynamically-computed
931 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
932 // method fails, then a MethodHandleInError is stored at the corresponding
933 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
934 // set a DynamicConstantInError here since any subsequent use of this
935 // bootstrap method will encounter the resolution of MethodHandleInError.
936 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
937 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
938 // for the bootstrap_specifier created above.
939 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
940 Exceptions::wrap_dynamic_exception(THREAD);
941 if (HAS_PENDING_EXCEPTION) {
942 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
943 // will check for a LinkageError and store a DynamicConstantInError.
944 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
945 }
946 result_oop = bootstrap_specifier.resolved_value()();
947 BasicType type = FieldType::basic_type(bootstrap_specifier.signature());
948 if (!is_reference_type(type)) {
949 // Make sure the primitive value is properly boxed.
950 // This is a JDK responsibility.
951 const char* fail = NULL;
952 if (result_oop == NULL) {
953 fail = "null result instead of box";
954 } else if (!is_java_primitive(type)) {
955 // FIXME: support value types via unboxing
956 fail = "can only handle references and primitives";
957 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
958 fail = "primitive is not properly boxed";
959 }
960 if (fail != NULL) {
961 // Since this exception is not a LinkageError, throw exception
962 // but do not save a DynamicInError resolution result.
963 // See section 5.4.3 of the VM spec.
964 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
965 }
966 }
967
968 if (TraceMethodHandles) {
969 bootstrap_specifier.print_msg_on(tty, "resolve_constant_at_impl");
970 }
971 break;
972 }
973
974 case JVM_CONSTANT_String:
975 assert(cache_index != _no_index_sentinel, "should have been set");
976 if (this_cp->is_pseudo_string_at(index)) {
977 result_oop = this_cp->pseudo_string_at(index, cache_index);
978 break;
979 }
980 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
981 break;
982
983 case JVM_CONSTANT_DynamicInError:
984 case JVM_CONSTANT_MethodHandleInError:
985 case JVM_CONSTANT_MethodTypeInError:
986 {
987 throw_resolution_error(this_cp, index, CHECK_NULL);
988 break;
989 }
990
991 case JVM_CONSTANT_MethodHandle:
992 {
993 int ref_kind = this_cp->method_handle_ref_kind_at(index);
994 int callee_index = this_cp->method_handle_klass_index_at(index);
995 Symbol* name = this_cp->method_handle_name_ref_at(index);
996 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
997 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
998 { ResourceMark rm(THREAD);
999 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1000 ref_kind, index, this_cp->method_handle_index_at(index),
1001 callee_index, name->as_C_string(), signature->as_C_string());
1002 }
1003
1004 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
1005
1006 // Check constant pool method consistency
1007 if ((callee->is_interface() && m_tag.is_method()) ||
1008 ((!callee->is_interface() && m_tag.is_interface_method()))) {
1009 ResourceMark rm(THREAD);
1010 stringStream ss;
1011 ss.print("Inconsistent constant pool data in classfile for class %s. "
1012 "Method '", callee->name()->as_C_string());
1013 signature->print_as_signature_external_return_type(&ss);
1014 ss.print(" %s(", name->as_C_string());
1015 signature->print_as_signature_external_parameters(&ss);
1016 ss.print(")' at index %d is %s and should be %s",
1017 index,
1018 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1019 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1020 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1021 }
1022
1023 Klass* klass = this_cp->pool_holder();
1024 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1025 callee, name, signature,
1026 THREAD);
1027 result_oop = value();
1028 if (HAS_PENDING_EXCEPTION) {
1029 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1030 }
1031 break;
1032 }
1033
1034 case JVM_CONSTANT_MethodType:
1035 {
1036 Symbol* signature = this_cp->method_type_signature_at(index);
1037 { ResourceMark rm(THREAD);
1038 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1039 index, this_cp->method_type_index_at(index),
1040 signature->as_C_string());
1041 }
1042 Klass* klass = this_cp->pool_holder();
1043 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1044 result_oop = value();
1045 if (HAS_PENDING_EXCEPTION) {
1046 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1047 }
1048 break;
1049 }
1050
1051 case JVM_CONSTANT_Integer:
1052 assert(cache_index == _no_index_sentinel, "should not have been set");
1053 prim_value.i = this_cp->int_at(index);
1054 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1055 break;
1056
1057 case JVM_CONSTANT_Float:
1058 assert(cache_index == _no_index_sentinel, "should not have been set");
1059 prim_value.f = this_cp->float_at(index);
1060 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1061 break;
1062
1063 case JVM_CONSTANT_Long:
1064 assert(cache_index == _no_index_sentinel, "should not have been set");
1065 prim_value.j = this_cp->long_at(index);
1066 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1067 break;
1068
1069 case JVM_CONSTANT_Double:
1070 assert(cache_index == _no_index_sentinel, "should not have been set");
1071 prim_value.d = this_cp->double_at(index);
1072 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1073 break;
1074
1075 default:
1076 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
1077 this_cp(), index, cache_index, tag.value()));
1078 assert(false, "unexpected constant tag");
1079 break;
1080 }
1081
1082 if (cache_index >= 0) {
1083 // Benign race condition: resolved_references may already be filled in.
1084 // The important thing here is that all threads pick up the same result.
1085 // It doesn't matter which racing thread wins, as long as only one
1086 // result is used by all threads, and all future queries.
1087 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop);
1088 oop old_result = this_cp->resolved_references()
1089 ->atomic_compare_exchange_oop(cache_index, new_result, NULL);
1090 if (old_result == NULL) {
1091 return result_oop; // was installed
1092 } else {
1093 // Return the winning thread's result. This can be different than
1094 // the result here for MethodHandles.
1095 if (oopDesc::equals(old_result, Universe::the_null_sentinel()))
1096 old_result = NULL;
1097 return old_result;
1098 }
1099 } else {
1100 assert(!oopDesc::equals(result_oop, Universe::the_null_sentinel()), "");
1101 return result_oop;
1102 }
1103}
1104
1105oop ConstantPool::uncached_string_at(int which, TRAPS) {
1106 Symbol* sym = unresolved_string_at(which);
1107 oop str = StringTable::intern(sym, CHECK_(NULL));
1108 assert(java_lang_String::is_instance(str), "must be string");
1109 return str;
1110}
1111
1112void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index,
1113 int start_arg, int end_arg,
1114 objArrayHandle info, int pos,
1115 bool must_resolve, Handle if_not_available,
1116 TRAPS) {
1117 int argc;
1118 int limit = pos + end_arg - start_arg;
1119 // checks: index in range [0..this_cp->length),
1120 // tag at index, start..end in range [0..argc],
1121 // info array non-null, pos..limit in [0..info.length]
1122 if ((0 >= index || index >= this_cp->length()) ||
1123 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1124 this_cp->tag_at(index).is_dynamic_constant()) ||
1125 (0 > start_arg || start_arg > end_arg) ||
1126 (end_arg > (argc = this_cp->bootstrap_argument_count_at(index))) ||
1127 (0 > pos || pos > limit) ||
1128 (info.is_null() || limit > info->length())) {
1129 // An index or something else went wrong; throw an error.
1130 // Since this is an internal API, we don't expect this,
1131 // so we don't bother to craft a nice message.
1132 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1133 }
1134 // now we can loop safely
1135 int info_i = pos;
1136 for (int i = start_arg; i < end_arg; i++) {
1137 int arg_index = this_cp->bootstrap_argument_index_at(index, i);
1138 oop arg_oop;
1139 if (must_resolve) {
1140 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1141 } else {
1142 bool found_it = false;
1143 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1144 if (!found_it) arg_oop = if_not_available();
1145 }
1146 info->obj_at_put(info_i++, arg_oop);
1147 }
1148}
1149
1150oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1151 // If the string has already been interned, this entry will be non-null
1152 oop str = this_cp->resolved_references()->obj_at(obj_index);
1153 assert(!oopDesc::equals(str, Universe::the_null_sentinel()), "");
1154 if (str != NULL) return str;
1155 Symbol* sym = this_cp->unresolved_string_at(which);
1156 str = StringTable::intern(sym, CHECK_(NULL));
1157 this_cp->string_at_put(which, obj_index, str);
1158 assert(java_lang_String::is_instance(str), "must be string");
1159 return str;
1160}
1161
1162
1163bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1164 // Names are interned, so we can compare Symbol*s directly
1165 Symbol* cp_name = klass_name_at(which);
1166 return (cp_name == k->name());
1167}
1168
1169
1170// Iterate over symbols and decrement ones which are Symbol*s
1171// This is done during GC.
1172// Only decrement the UTF8 symbols. Strings point to
1173// these symbols but didn't increment the reference count.
1174void ConstantPool::unreference_symbols() {
1175 for (int index = 1; index < length(); index++) { // Index 0 is unused
1176 constantTag tag = tag_at(index);
1177 if (tag.is_symbol()) {
1178 symbol_at(index)->decrement_refcount();
1179 }
1180 }
1181}
1182
1183
1184// Compare this constant pool's entry at index1 to the constant pool
1185// cp2's entry at index2.
1186bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1187 int index2, TRAPS) {
1188
1189 // The error tags are equivalent to non-error tags when comparing
1190 jbyte t1 = tag_at(index1).non_error_value();
1191 jbyte t2 = cp2->tag_at(index2).non_error_value();
1192
1193 if (t1 != t2) {
1194 // Not the same entry type so there is nothing else to check. Note
1195 // that this style of checking will consider resolved/unresolved
1196 // class pairs as different.
1197 // From the ConstantPool* API point of view, this is correct
1198 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1199 // plays out in the context of ConstantPool* merging.
1200 return false;
1201 }
1202
1203 switch (t1) {
1204 case JVM_CONSTANT_Class:
1205 {
1206 Klass* k1 = klass_at(index1, CHECK_false);
1207 Klass* k2 = cp2->klass_at(index2, CHECK_false);
1208 if (k1 == k2) {
1209 return true;
1210 }
1211 } break;
1212
1213 case JVM_CONSTANT_ClassIndex:
1214 {
1215 int recur1 = klass_index_at(index1);
1216 int recur2 = cp2->klass_index_at(index2);
1217 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1218 if (match) {
1219 return true;
1220 }
1221 } break;
1222
1223 case JVM_CONSTANT_Double:
1224 {
1225 jdouble d1 = double_at(index1);
1226 jdouble d2 = cp2->double_at(index2);
1227 if (d1 == d2) {
1228 return true;
1229 }
1230 } break;
1231
1232 case JVM_CONSTANT_Fieldref:
1233 case JVM_CONSTANT_InterfaceMethodref:
1234 case JVM_CONSTANT_Methodref:
1235 {
1236 int recur1 = uncached_klass_ref_index_at(index1);
1237 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1238 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1239 if (match) {
1240 recur1 = uncached_name_and_type_ref_index_at(index1);
1241 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1242 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1243 if (match) {
1244 return true;
1245 }
1246 }
1247 } break;
1248
1249 case JVM_CONSTANT_Float:
1250 {
1251 jfloat f1 = float_at(index1);
1252 jfloat f2 = cp2->float_at(index2);
1253 if (f1 == f2) {
1254 return true;
1255 }
1256 } break;
1257
1258 case JVM_CONSTANT_Integer:
1259 {
1260 jint i1 = int_at(index1);
1261 jint i2 = cp2->int_at(index2);
1262 if (i1 == i2) {
1263 return true;
1264 }
1265 } break;
1266
1267 case JVM_CONSTANT_Long:
1268 {
1269 jlong l1 = long_at(index1);
1270 jlong l2 = cp2->long_at(index2);
1271 if (l1 == l2) {
1272 return true;
1273 }
1274 } break;
1275
1276 case JVM_CONSTANT_NameAndType:
1277 {
1278 int recur1 = name_ref_index_at(index1);
1279 int recur2 = cp2->name_ref_index_at(index2);
1280 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1281 if (match) {
1282 recur1 = signature_ref_index_at(index1);
1283 recur2 = cp2->signature_ref_index_at(index2);
1284 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1285 if (match) {
1286 return true;
1287 }
1288 }
1289 } break;
1290
1291 case JVM_CONSTANT_StringIndex:
1292 {
1293 int recur1 = string_index_at(index1);
1294 int recur2 = cp2->string_index_at(index2);
1295 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1296 if (match) {
1297 return true;
1298 }
1299 } break;
1300
1301 case JVM_CONSTANT_UnresolvedClass:
1302 {
1303 Symbol* k1 = klass_name_at(index1);
1304 Symbol* k2 = cp2->klass_name_at(index2);
1305 if (k1 == k2) {
1306 return true;
1307 }
1308 } break;
1309
1310 case JVM_CONSTANT_MethodType:
1311 {
1312 int k1 = method_type_index_at(index1);
1313 int k2 = cp2->method_type_index_at(index2);
1314 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1315 if (match) {
1316 return true;
1317 }
1318 } break;
1319
1320 case JVM_CONSTANT_MethodHandle:
1321 {
1322 int k1 = method_handle_ref_kind_at(index1);
1323 int k2 = cp2->method_handle_ref_kind_at(index2);
1324 if (k1 == k2) {
1325 int i1 = method_handle_index_at(index1);
1326 int i2 = cp2->method_handle_index_at(index2);
1327 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1328 if (match) {
1329 return true;
1330 }
1331 }
1332 } break;
1333
1334 case JVM_CONSTANT_Dynamic:
1335 {
1336 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1337 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1338 int i1 = bootstrap_methods_attribute_index(index1);
1339 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1340 // separate statements and variables because CHECK_false is used
1341 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1342 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1343 return (match_entry && match_operand);
1344 } break;
1345
1346 case JVM_CONSTANT_InvokeDynamic:
1347 {
1348 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1349 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1350 int i1 = bootstrap_methods_attribute_index(index1);
1351 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1352 // separate statements and variables because CHECK_false is used
1353 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1354 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1355 return (match_entry && match_operand);
1356 } break;
1357
1358 case JVM_CONSTANT_String:
1359 {
1360 Symbol* s1 = unresolved_string_at(index1);
1361 Symbol* s2 = cp2->unresolved_string_at(index2);
1362 if (s1 == s2) {
1363 return true;
1364 }
1365 } break;
1366
1367 case JVM_CONSTANT_Utf8:
1368 {
1369 Symbol* s1 = symbol_at(index1);
1370 Symbol* s2 = cp2->symbol_at(index2);
1371 if (s1 == s2) {
1372 return true;
1373 }
1374 } break;
1375
1376 // Invalid is used as the tag for the second constant pool entry
1377 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1378 // not be seen by itself.
1379 case JVM_CONSTANT_Invalid: // fall through
1380
1381 default:
1382 ShouldNotReachHere();
1383 break;
1384 }
1385
1386 return false;
1387} // end compare_entry_to()
1388
1389
1390// Resize the operands array with delta_len and delta_size.
1391// Used in RedefineClasses for CP merge.
1392void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1393 int old_len = operand_array_length(operands());
1394 int new_len = old_len + delta_len;
1395 int min_len = (delta_len > 0) ? old_len : new_len;
1396
1397 int old_size = operands()->length();
1398 int new_size = old_size + delta_size;
1399 int min_size = (delta_size > 0) ? old_size : new_size;
1400
1401 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1402 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1403
1404 // Set index in the resized array for existing elements only
1405 for (int idx = 0; idx < min_len; idx++) {
1406 int offset = operand_offset_at(idx); // offset in original array
1407 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1408 }
1409 // Copy the bootstrap specifiers only
1410 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1411 new_ops->adr_at(2*new_len),
1412 (min_size - 2*min_len) * sizeof(u2));
1413 // Explicitly deallocate old operands array.
1414 // Note, it is not needed for 7u backport.
1415 if ( operands() != NULL) { // the safety check
1416 MetadataFactory::free_array<u2>(loader_data, operands());
1417 }
1418 set_operands(new_ops);
1419} // end resize_operands()
1420
1421
1422// Extend the operands array with the length and size of the ext_cp operands.
1423// Used in RedefineClasses for CP merge.
1424void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1425 int delta_len = operand_array_length(ext_cp->operands());
1426 if (delta_len == 0) {
1427 return; // nothing to do
1428 }
1429 int delta_size = ext_cp->operands()->length();
1430
1431 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1432
1433 if (operand_array_length(operands()) == 0) {
1434 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1435 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1436 // The first element index defines the offset of second part
1437 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1438 set_operands(new_ops);
1439 } else {
1440 resize_operands(delta_len, delta_size, CHECK);
1441 }
1442
1443} // end extend_operands()
1444
1445
1446// Shrink the operands array to a smaller array with new_len length.
1447// Used in RedefineClasses for CP merge.
1448void ConstantPool::shrink_operands(int new_len, TRAPS) {
1449 int old_len = operand_array_length(operands());
1450 if (new_len == old_len) {
1451 return; // nothing to do
1452 }
1453 assert(new_len < old_len, "shrunken operands array must be smaller");
1454
1455 int free_base = operand_next_offset_at(new_len - 1);
1456 int delta_len = new_len - old_len;
1457 int delta_size = 2*delta_len + free_base - operands()->length();
1458
1459 resize_operands(delta_len, delta_size, CHECK);
1460
1461} // end shrink_operands()
1462
1463
1464void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1465 const constantPoolHandle& to_cp,
1466 TRAPS) {
1467
1468 int from_oplen = operand_array_length(from_cp->operands());
1469 int old_oplen = operand_array_length(to_cp->operands());
1470 if (from_oplen != 0) {
1471 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1472 // append my operands to the target's operands array
1473 if (old_oplen == 0) {
1474 // Can't just reuse from_cp's operand list because of deallocation issues
1475 int len = from_cp->operands()->length();
1476 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1477 Copy::conjoint_memory_atomic(
1478 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1479 to_cp->set_operands(new_ops);
1480 } else {
1481 int old_len = to_cp->operands()->length();
1482 int from_len = from_cp->operands()->length();
1483 int old_off = old_oplen * sizeof(u2);
1484 int from_off = from_oplen * sizeof(u2);
1485 // Use the metaspace for the destination constant pool
1486 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1487 int fillp = 0, len = 0;
1488 // first part of dest
1489 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1490 new_operands->adr_at(fillp),
1491 (len = old_off) * sizeof(u2));
1492 fillp += len;
1493 // first part of src
1494 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1495 new_operands->adr_at(fillp),
1496 (len = from_off) * sizeof(u2));
1497 fillp += len;
1498 // second part of dest
1499 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1500 new_operands->adr_at(fillp),
1501 (len = old_len - old_off) * sizeof(u2));
1502 fillp += len;
1503 // second part of src
1504 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1505 new_operands->adr_at(fillp),
1506 (len = from_len - from_off) * sizeof(u2));
1507 fillp += len;
1508 assert(fillp == new_operands->length(), "");
1509
1510 // Adjust indexes in the first part of the copied operands array.
1511 for (int j = 0; j < from_oplen; j++) {
1512 int offset = operand_offset_at(new_operands, old_oplen + j);
1513 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1514 offset += old_len; // every new tuple is preceded by old_len extra u2's
1515 operand_offset_at_put(new_operands, old_oplen + j, offset);
1516 }
1517
1518 // replace target operands array with combined array
1519 to_cp->set_operands(new_operands);
1520 }
1521 }
1522} // end copy_operands()
1523
1524
1525// Copy this constant pool's entries at start_i to end_i (inclusive)
1526// to the constant pool to_cp's entries starting at to_i. A total of
1527// (end_i - start_i) + 1 entries are copied.
1528void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1529 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1530
1531
1532 int dest_i = to_i; // leave original alone for debug purposes
1533
1534 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1535 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1536
1537 switch (from_cp->tag_at(src_i).value()) {
1538 case JVM_CONSTANT_Double:
1539 case JVM_CONSTANT_Long:
1540 // double and long take two constant pool entries
1541 src_i += 2;
1542 dest_i += 2;
1543 break;
1544
1545 default:
1546 // all others take one constant pool entry
1547 src_i++;
1548 dest_i++;
1549 break;
1550 }
1551 }
1552 copy_operands(from_cp, to_cp, CHECK);
1553
1554} // end copy_cp_to_impl()
1555
1556
1557// Copy this constant pool's entry at from_i to the constant pool
1558// to_cp's entry at to_i.
1559void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1560 const constantPoolHandle& to_cp, int to_i,
1561 TRAPS) {
1562
1563 int tag = from_cp->tag_at(from_i).value();
1564 switch (tag) {
1565 case JVM_CONSTANT_ClassIndex:
1566 {
1567 jint ki = from_cp->klass_index_at(from_i);
1568 to_cp->klass_index_at_put(to_i, ki);
1569 } break;
1570
1571 case JVM_CONSTANT_Double:
1572 {
1573 jdouble d = from_cp->double_at(from_i);
1574 to_cp->double_at_put(to_i, d);
1575 // double takes two constant pool entries so init second entry's tag
1576 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1577 } break;
1578
1579 case JVM_CONSTANT_Fieldref:
1580 {
1581 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1582 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1583 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1584 } break;
1585
1586 case JVM_CONSTANT_Float:
1587 {
1588 jfloat f = from_cp->float_at(from_i);
1589 to_cp->float_at_put(to_i, f);
1590 } break;
1591
1592 case JVM_CONSTANT_Integer:
1593 {
1594 jint i = from_cp->int_at(from_i);
1595 to_cp->int_at_put(to_i, i);
1596 } break;
1597
1598 case JVM_CONSTANT_InterfaceMethodref:
1599 {
1600 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1601 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1602 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1603 } break;
1604
1605 case JVM_CONSTANT_Long:
1606 {
1607 jlong l = from_cp->long_at(from_i);
1608 to_cp->long_at_put(to_i, l);
1609 // long takes two constant pool entries so init second entry's tag
1610 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1611 } break;
1612
1613 case JVM_CONSTANT_Methodref:
1614 {
1615 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1616 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1617 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1618 } break;
1619
1620 case JVM_CONSTANT_NameAndType:
1621 {
1622 int name_ref_index = from_cp->name_ref_index_at(from_i);
1623 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1624 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1625 } break;
1626
1627 case JVM_CONSTANT_StringIndex:
1628 {
1629 jint si = from_cp->string_index_at(from_i);
1630 to_cp->string_index_at_put(to_i, si);
1631 } break;
1632
1633 case JVM_CONSTANT_Class:
1634 case JVM_CONSTANT_UnresolvedClass:
1635 case JVM_CONSTANT_UnresolvedClassInError:
1636 {
1637 // Revert to JVM_CONSTANT_ClassIndex
1638 int name_index = from_cp->klass_slot_at(from_i).name_index();
1639 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1640 to_cp->klass_index_at_put(to_i, name_index);
1641 } break;
1642
1643 case JVM_CONSTANT_String:
1644 {
1645 Symbol* s = from_cp->unresolved_string_at(from_i);
1646 to_cp->unresolved_string_at_put(to_i, s);
1647 } break;
1648
1649 case JVM_CONSTANT_Utf8:
1650 {
1651 Symbol* s = from_cp->symbol_at(from_i);
1652 // Need to increase refcount, the old one will be thrown away and deferenced
1653 s->increment_refcount();
1654 to_cp->symbol_at_put(to_i, s);
1655 } break;
1656
1657 case JVM_CONSTANT_MethodType:
1658 case JVM_CONSTANT_MethodTypeInError:
1659 {
1660 jint k = from_cp->method_type_index_at(from_i);
1661 to_cp->method_type_index_at_put(to_i, k);
1662 } break;
1663
1664 case JVM_CONSTANT_MethodHandle:
1665 case JVM_CONSTANT_MethodHandleInError:
1666 {
1667 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1668 int k2 = from_cp->method_handle_index_at(from_i);
1669 to_cp->method_handle_index_at_put(to_i, k1, k2);
1670 } break;
1671
1672 case JVM_CONSTANT_Dynamic:
1673 case JVM_CONSTANT_DynamicInError:
1674 {
1675 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1676 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1677 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1678 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1679 } break;
1680
1681 case JVM_CONSTANT_InvokeDynamic:
1682 {
1683 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1684 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1685 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1686 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1687 } break;
1688
1689 // Invalid is used as the tag for the second constant pool entry
1690 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1691 // not be seen by itself.
1692 case JVM_CONSTANT_Invalid: // fall through
1693
1694 default:
1695 {
1696 ShouldNotReachHere();
1697 } break;
1698 }
1699} // end copy_entry_to()
1700
1701// Search constant pool search_cp for an entry that matches this
1702// constant pool's entry at pattern_i. Returns the index of a
1703// matching entry or zero (0) if there is no matching entry.
1704int ConstantPool::find_matching_entry(int pattern_i,
1705 const constantPoolHandle& search_cp, TRAPS) {
1706
1707 // index zero (0) is not used
1708 for (int i = 1; i < search_cp->length(); i++) {
1709 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1710 if (found) {
1711 return i;
1712 }
1713 }
1714
1715 return 0; // entry not found; return unused index zero (0)
1716} // end find_matching_entry()
1717
1718
1719// Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1720// cp2's bootstrap specifier at idx2.
1721bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1722 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1723 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1724 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1725
1726 if (!match) {
1727 return false;
1728 }
1729 int argc = operand_argument_count_at(idx1);
1730 if (argc == cp2->operand_argument_count_at(idx2)) {
1731 for (int j = 0; j < argc; j++) {
1732 k1 = operand_argument_index_at(idx1, j);
1733 k2 = cp2->operand_argument_index_at(idx2, j);
1734 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1735 if (!match) {
1736 return false;
1737 }
1738 }
1739 return true; // got through loop; all elements equal
1740 }
1741 return false;
1742} // end compare_operand_to()
1743
1744// Search constant pool search_cp for a bootstrap specifier that matches
1745// this constant pool's bootstrap specifier data at pattern_i index.
1746// Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1747int ConstantPool::find_matching_operand(int pattern_i,
1748 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1749 for (int i = 0; i < search_len; i++) {
1750 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1751 if (found) {
1752 return i;
1753 }
1754 }
1755 return -1; // bootstrap specifier data not found; return unused index (-1)
1756} // end find_matching_operand()
1757
1758
1759#ifndef PRODUCT
1760
1761const char* ConstantPool::printable_name_at(int which) {
1762
1763 constantTag tag = tag_at(which);
1764
1765 if (tag.is_string()) {
1766 return string_at_noresolve(which);
1767 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1768 return klass_name_at(which)->as_C_string();
1769 } else if (tag.is_symbol()) {
1770 return symbol_at(which)->as_C_string();
1771 }
1772 return "";
1773}
1774
1775#endif // PRODUCT
1776
1777
1778// JVMTI GetConstantPool support
1779
1780// For debugging of constant pool
1781const bool debug_cpool = false;
1782
1783#define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1784
1785static void print_cpool_bytes(jint cnt, u1 *bytes) {
1786 const char* WARN_MSG = "Must not be such entry!";
1787 jint size = 0;
1788 u2 idx1, idx2;
1789
1790 for (jint idx = 1; idx < cnt; idx++) {
1791 jint ent_size = 0;
1792 u1 tag = *bytes++;
1793 size++; // count tag
1794
1795 printf("const #%03d, tag: %02d ", idx, tag);
1796 switch(tag) {
1797 case JVM_CONSTANT_Invalid: {
1798 printf("Invalid");
1799 break;
1800 }
1801 case JVM_CONSTANT_Unicode: {
1802 printf("Unicode %s", WARN_MSG);
1803 break;
1804 }
1805 case JVM_CONSTANT_Utf8: {
1806 u2 len = Bytes::get_Java_u2(bytes);
1807 char str[128];
1808 if (len > 127) {
1809 len = 127;
1810 }
1811 strncpy(str, (char *) (bytes+2), len);
1812 str[len] = '\0';
1813 printf("Utf8 \"%s\"", str);
1814 ent_size = 2 + len;
1815 break;
1816 }
1817 case JVM_CONSTANT_Integer: {
1818 u4 val = Bytes::get_Java_u4(bytes);
1819 printf("int %d", *(int *) &val);
1820 ent_size = 4;
1821 break;
1822 }
1823 case JVM_CONSTANT_Float: {
1824 u4 val = Bytes::get_Java_u4(bytes);
1825 printf("float %5.3ff", *(float *) &val);
1826 ent_size = 4;
1827 break;
1828 }
1829 case JVM_CONSTANT_Long: {
1830 u8 val = Bytes::get_Java_u8(bytes);
1831 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1832 ent_size = 8;
1833 idx++; // Long takes two cpool slots
1834 break;
1835 }
1836 case JVM_CONSTANT_Double: {
1837 u8 val = Bytes::get_Java_u8(bytes);
1838 printf("double %5.3fd", *(jdouble *)&val);
1839 ent_size = 8;
1840 idx++; // Double takes two cpool slots
1841 break;
1842 }
1843 case JVM_CONSTANT_Class: {
1844 idx1 = Bytes::get_Java_u2(bytes);
1845 printf("class #%03d", idx1);
1846 ent_size = 2;
1847 break;
1848 }
1849 case JVM_CONSTANT_String: {
1850 idx1 = Bytes::get_Java_u2(bytes);
1851 printf("String #%03d", idx1);
1852 ent_size = 2;
1853 break;
1854 }
1855 case JVM_CONSTANT_Fieldref: {
1856 idx1 = Bytes::get_Java_u2(bytes);
1857 idx2 = Bytes::get_Java_u2(bytes+2);
1858 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1859 ent_size = 4;
1860 break;
1861 }
1862 case JVM_CONSTANT_Methodref: {
1863 idx1 = Bytes::get_Java_u2(bytes);
1864 idx2 = Bytes::get_Java_u2(bytes+2);
1865 printf("Method #%03d, #%03d", idx1, idx2);
1866 ent_size = 4;
1867 break;
1868 }
1869 case JVM_CONSTANT_InterfaceMethodref: {
1870 idx1 = Bytes::get_Java_u2(bytes);
1871 idx2 = Bytes::get_Java_u2(bytes+2);
1872 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1873 ent_size = 4;
1874 break;
1875 }
1876 case JVM_CONSTANT_NameAndType: {
1877 idx1 = Bytes::get_Java_u2(bytes);
1878 idx2 = Bytes::get_Java_u2(bytes+2);
1879 printf("NameAndType #%03d, #%03d", idx1, idx2);
1880 ent_size = 4;
1881 break;
1882 }
1883 case JVM_CONSTANT_ClassIndex: {
1884 printf("ClassIndex %s", WARN_MSG);
1885 break;
1886 }
1887 case JVM_CONSTANT_UnresolvedClass: {
1888 printf("UnresolvedClass: %s", WARN_MSG);
1889 break;
1890 }
1891 case JVM_CONSTANT_UnresolvedClassInError: {
1892 printf("UnresolvedClassInErr: %s", WARN_MSG);
1893 break;
1894 }
1895 case JVM_CONSTANT_StringIndex: {
1896 printf("StringIndex: %s", WARN_MSG);
1897 break;
1898 }
1899 }
1900 printf(";\n");
1901 bytes += ent_size;
1902 size += ent_size;
1903 }
1904 printf("Cpool size: %d\n", size);
1905 fflush(0);
1906 return;
1907} /* end print_cpool_bytes */
1908
1909
1910// Returns size of constant pool entry.
1911jint ConstantPool::cpool_entry_size(jint idx) {
1912 switch(tag_at(idx).value()) {
1913 case JVM_CONSTANT_Invalid:
1914 case JVM_CONSTANT_Unicode:
1915 return 1;
1916
1917 case JVM_CONSTANT_Utf8:
1918 return 3 + symbol_at(idx)->utf8_length();
1919
1920 case JVM_CONSTANT_Class:
1921 case JVM_CONSTANT_String:
1922 case JVM_CONSTANT_ClassIndex:
1923 case JVM_CONSTANT_UnresolvedClass:
1924 case JVM_CONSTANT_UnresolvedClassInError:
1925 case JVM_CONSTANT_StringIndex:
1926 case JVM_CONSTANT_MethodType:
1927 case JVM_CONSTANT_MethodTypeInError:
1928 return 3;
1929
1930 case JVM_CONSTANT_MethodHandle:
1931 case JVM_CONSTANT_MethodHandleInError:
1932 return 4; //tag, ref_kind, ref_index
1933
1934 case JVM_CONSTANT_Integer:
1935 case JVM_CONSTANT_Float:
1936 case JVM_CONSTANT_Fieldref:
1937 case JVM_CONSTANT_Methodref:
1938 case JVM_CONSTANT_InterfaceMethodref:
1939 case JVM_CONSTANT_NameAndType:
1940 return 5;
1941
1942 case JVM_CONSTANT_Dynamic:
1943 case JVM_CONSTANT_DynamicInError:
1944 case JVM_CONSTANT_InvokeDynamic:
1945 // u1 tag, u2 bsm, u2 nt
1946 return 5;
1947
1948 case JVM_CONSTANT_Long:
1949 case JVM_CONSTANT_Double:
1950 return 9;
1951 }
1952 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1953 return 1;
1954} /* end cpool_entry_size */
1955
1956
1957// SymbolHashMap is used to find a constant pool index from a string.
1958// This function fills in SymbolHashMaps, one for utf8s and one for
1959// class names, returns size of the cpool raw bytes.
1960jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1961 SymbolHashMap *classmap) {
1962 jint size = 0;
1963
1964 for (u2 idx = 1; idx < length(); idx++) {
1965 u2 tag = tag_at(idx).value();
1966 size += cpool_entry_size(idx);
1967
1968 switch(tag) {
1969 case JVM_CONSTANT_Utf8: {
1970 Symbol* sym = symbol_at(idx);
1971 symmap->add_entry(sym, idx);
1972 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1973 break;
1974 }
1975 case JVM_CONSTANT_Class:
1976 case JVM_CONSTANT_UnresolvedClass:
1977 case JVM_CONSTANT_UnresolvedClassInError: {
1978 Symbol* sym = klass_name_at(idx);
1979 classmap->add_entry(sym, idx);
1980 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1981 break;
1982 }
1983 case JVM_CONSTANT_Long:
1984 case JVM_CONSTANT_Double: {
1985 idx++; // Both Long and Double take two cpool slots
1986 break;
1987 }
1988 }
1989 }
1990 return size;
1991} /* end hash_utf8_entries_to */
1992
1993
1994// Copy cpool bytes.
1995// Returns:
1996// 0, in case of OutOfMemoryError
1997// -1, in case of internal error
1998// > 0, count of the raw cpool bytes that have been copied
1999int ConstantPool::copy_cpool_bytes(int cpool_size,
2000 SymbolHashMap* tbl,
2001 unsigned char *bytes) {
2002 u2 idx1, idx2;
2003 jint size = 0;
2004 jint cnt = length();
2005 unsigned char *start_bytes = bytes;
2006
2007 for (jint idx = 1; idx < cnt; idx++) {
2008 u1 tag = tag_at(idx).value();
2009 jint ent_size = cpool_entry_size(idx);
2010
2011 assert(size + ent_size <= cpool_size, "Size mismatch");
2012
2013 *bytes = tag;
2014 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2015 switch(tag) {
2016 case JVM_CONSTANT_Invalid: {
2017 DBG(printf("JVM_CONSTANT_Invalid"));
2018 break;
2019 }
2020 case JVM_CONSTANT_Unicode: {
2021 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2022 DBG(printf("JVM_CONSTANT_Unicode"));
2023 break;
2024 }
2025 case JVM_CONSTANT_Utf8: {
2026 Symbol* sym = symbol_at(idx);
2027 char* str = sym->as_utf8();
2028 // Warning! It's crashing on x86 with len = sym->utf8_length()
2029 int len = (int) strlen(str);
2030 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2031 for (int i = 0; i < len; i++) {
2032 bytes[3+i] = (u1) str[i];
2033 }
2034 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2035 break;
2036 }
2037 case JVM_CONSTANT_Integer: {
2038 jint val = int_at(idx);
2039 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2040 break;
2041 }
2042 case JVM_CONSTANT_Float: {
2043 jfloat val = float_at(idx);
2044 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2045 break;
2046 }
2047 case JVM_CONSTANT_Long: {
2048 jlong val = long_at(idx);
2049 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2050 idx++; // Long takes two cpool slots
2051 break;
2052 }
2053 case JVM_CONSTANT_Double: {
2054 jdouble val = double_at(idx);
2055 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2056 idx++; // Double takes two cpool slots
2057 break;
2058 }
2059 case JVM_CONSTANT_Class:
2060 case JVM_CONSTANT_UnresolvedClass:
2061 case JVM_CONSTANT_UnresolvedClassInError: {
2062 *bytes = JVM_CONSTANT_Class;
2063 Symbol* sym = klass_name_at(idx);
2064 idx1 = tbl->symbol_to_value(sym);
2065 assert(idx1 != 0, "Have not found a hashtable entry");
2066 Bytes::put_Java_u2((address) (bytes+1), idx1);
2067 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2068 break;
2069 }
2070 case JVM_CONSTANT_String: {
2071 *bytes = JVM_CONSTANT_String;
2072 Symbol* sym = unresolved_string_at(idx);
2073 idx1 = tbl->symbol_to_value(sym);
2074 assert(idx1 != 0, "Have not found a hashtable entry");
2075 Bytes::put_Java_u2((address) (bytes+1), idx1);
2076 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2077 break;
2078 }
2079 case JVM_CONSTANT_Fieldref:
2080 case JVM_CONSTANT_Methodref:
2081 case JVM_CONSTANT_InterfaceMethodref: {
2082 idx1 = uncached_klass_ref_index_at(idx);
2083 idx2 = uncached_name_and_type_ref_index_at(idx);
2084 Bytes::put_Java_u2((address) (bytes+1), idx1);
2085 Bytes::put_Java_u2((address) (bytes+3), idx2);
2086 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2087 break;
2088 }
2089 case JVM_CONSTANT_NameAndType: {
2090 idx1 = name_ref_index_at(idx);
2091 idx2 = signature_ref_index_at(idx);
2092 Bytes::put_Java_u2((address) (bytes+1), idx1);
2093 Bytes::put_Java_u2((address) (bytes+3), idx2);
2094 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2095 break;
2096 }
2097 case JVM_CONSTANT_ClassIndex: {
2098 *bytes = JVM_CONSTANT_Class;
2099 idx1 = klass_index_at(idx);
2100 Bytes::put_Java_u2((address) (bytes+1), idx1);
2101 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2102 break;
2103 }
2104 case JVM_CONSTANT_StringIndex: {
2105 *bytes = JVM_CONSTANT_String;
2106 idx1 = string_index_at(idx);
2107 Bytes::put_Java_u2((address) (bytes+1), idx1);
2108 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2109 break;
2110 }
2111 case JVM_CONSTANT_MethodHandle:
2112 case JVM_CONSTANT_MethodHandleInError: {
2113 *bytes = JVM_CONSTANT_MethodHandle;
2114 int kind = method_handle_ref_kind_at(idx);
2115 idx1 = method_handle_index_at(idx);
2116 *(bytes+1) = (unsigned char) kind;
2117 Bytes::put_Java_u2((address) (bytes+2), idx1);
2118 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2119 break;
2120 }
2121 case JVM_CONSTANT_MethodType:
2122 case JVM_CONSTANT_MethodTypeInError: {
2123 *bytes = JVM_CONSTANT_MethodType;
2124 idx1 = method_type_index_at(idx);
2125 Bytes::put_Java_u2((address) (bytes+1), idx1);
2126 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2127 break;
2128 }
2129 case JVM_CONSTANT_Dynamic:
2130 case JVM_CONSTANT_DynamicInError: {
2131 *bytes = tag;
2132 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2133 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2134 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2135 Bytes::put_Java_u2((address) (bytes+1), idx1);
2136 Bytes::put_Java_u2((address) (bytes+3), idx2);
2137 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2138 break;
2139 }
2140 case JVM_CONSTANT_InvokeDynamic: {
2141 *bytes = tag;
2142 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2143 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2144 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2145 Bytes::put_Java_u2((address) (bytes+1), idx1);
2146 Bytes::put_Java_u2((address) (bytes+3), idx2);
2147 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2148 break;
2149 }
2150 }
2151 DBG(printf("\n"));
2152 bytes += ent_size;
2153 size += ent_size;
2154 }
2155 assert(size == cpool_size, "Size mismatch");
2156
2157 // Keep temorarily for debugging until it's stable.
2158 DBG(print_cpool_bytes(cnt, start_bytes));
2159 return (int)(bytes - start_bytes);
2160} /* end copy_cpool_bytes */
2161
2162#undef DBG
2163
2164
2165void ConstantPool::set_on_stack(const bool value) {
2166 if (value) {
2167 // Only record if it's not already set.
2168 if (!on_stack()) {
2169 assert(!is_shared(), "should always be set for shared constant pools");
2170 _flags |= _on_stack;
2171 MetadataOnStackMark::record(this);
2172 }
2173 } else {
2174 // Clearing is done single-threadedly.
2175 if (!is_shared()) {
2176 _flags &= ~_on_stack;
2177 }
2178 }
2179}
2180
2181// JSR 292 support for patching constant pool oops after the class is linked and
2182// the oop array for resolved references are created.
2183// We can't do this during classfile parsing, which is how the other indexes are
2184// patched. The other patches are applied early for some error checking
2185// so only defer the pseudo_strings.
2186void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
2187 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
2188 Handle patch = cp_patches->at(index);
2189 if (patch.not_null()) {
2190 assert (tag_at(index).is_string(), "should only be string left");
2191 // Patching a string means pre-resolving it.
2192 // The spelling in the constant pool is ignored.
2193 // The constant reference may be any object whatever.
2194 // If it is not a real interned string, the constant is referred
2195 // to as a "pseudo-string", and must be presented to the CP
2196 // explicitly, because it may require scavenging.
2197 int obj_index = cp_to_object_index(index);
2198 pseudo_string_at_put(index, obj_index, patch());
2199 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
2200 }
2201 }
2202#ifdef ASSERT
2203 // Ensure that all the patches have been used.
2204 for (int index = 0; index < cp_patches->length(); index++) {
2205 assert(cp_patches->at(index).is_null(),
2206 "Unused constant pool patch at %d in class file %s",
2207 index,
2208 pool_holder()->external_name());
2209 }
2210#endif // ASSERT
2211}
2212
2213// Printing
2214
2215void ConstantPool::print_on(outputStream* st) const {
2216 assert(is_constantPool(), "must be constantPool");
2217 st->print_cr("%s", internal_name());
2218 if (flags() != 0) {
2219 st->print(" - flags: 0x%x", flags());
2220 if (has_preresolution()) st->print(" has_preresolution");
2221 if (on_stack()) st->print(" on_stack");
2222 st->cr();
2223 }
2224 if (pool_holder() != NULL) {
2225 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
2226 }
2227 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
2228 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
2229 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
2230 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
2231
2232 for (int index = 1; index < length(); index++) { // Index 0 is unused
2233 ((ConstantPool*)this)->print_entry_on(index, st);
2234 switch (tag_at(index).value()) {
2235 case JVM_CONSTANT_Long :
2236 case JVM_CONSTANT_Double :
2237 index++; // Skip entry following eigth-byte constant
2238 }
2239
2240 }
2241 st->cr();
2242}
2243
2244// Print one constant pool entry
2245void ConstantPool::print_entry_on(const int index, outputStream* st) {
2246 EXCEPTION_MARK;
2247 st->print(" - %3d : ", index);
2248 tag_at(index).print_on(st);
2249 st->print(" : ");
2250 switch (tag_at(index).value()) {
2251 case JVM_CONSTANT_Class :
2252 { Klass* k = klass_at(index, CATCH);
2253 guarantee(k != NULL, "need klass");
2254 k->print_value_on(st);
2255 st->print(" {" PTR_FORMAT "}", p2i(k));
2256 }
2257 break;
2258 case JVM_CONSTANT_Fieldref :
2259 case JVM_CONSTANT_Methodref :
2260 case JVM_CONSTANT_InterfaceMethodref :
2261 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2262 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2263 break;
2264 case JVM_CONSTANT_String :
2265 if (is_pseudo_string_at(index)) {
2266 oop anObj = pseudo_string_at(index);
2267 anObj->print_value_on(st);
2268 st->print(" {" PTR_FORMAT "}", p2i(anObj));
2269 } else {
2270 unresolved_string_at(index)->print_value_on(st);
2271 }
2272 break;
2273 case JVM_CONSTANT_Integer :
2274 st->print("%d", int_at(index));
2275 break;
2276 case JVM_CONSTANT_Float :
2277 st->print("%f", float_at(index));
2278 break;
2279 case JVM_CONSTANT_Long :
2280 st->print_jlong(long_at(index));
2281 break;
2282 case JVM_CONSTANT_Double :
2283 st->print("%lf", double_at(index));
2284 break;
2285 case JVM_CONSTANT_NameAndType :
2286 st->print("name_index=%d", name_ref_index_at(index));
2287 st->print(" signature_index=%d", signature_ref_index_at(index));
2288 break;
2289 case JVM_CONSTANT_Utf8 :
2290 symbol_at(index)->print_value_on(st);
2291 break;
2292 case JVM_CONSTANT_ClassIndex: {
2293 int name_index = *int_at_addr(index);
2294 st->print("klass_index=%d ", name_index);
2295 symbol_at(name_index)->print_value_on(st);
2296 }
2297 break;
2298 case JVM_CONSTANT_UnresolvedClass : // fall-through
2299 case JVM_CONSTANT_UnresolvedClassInError: {
2300 CPKlassSlot kslot = klass_slot_at(index);
2301 int resolved_klass_index = kslot.resolved_klass_index();
2302 int name_index = kslot.name_index();
2303 assert(tag_at(name_index).is_symbol(), "sanity");
2304
2305 Klass* klass = resolved_klasses()->at(resolved_klass_index);
2306 if (klass != NULL) {
2307 klass->print_value_on(st);
2308 } else {
2309 symbol_at(name_index)->print_value_on(st);
2310 }
2311 }
2312 break;
2313 case JVM_CONSTANT_MethodHandle :
2314 case JVM_CONSTANT_MethodHandleInError :
2315 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2316 st->print(" ref_index=%d", method_handle_index_at(index));
2317 break;
2318 case JVM_CONSTANT_MethodType :
2319 case JVM_CONSTANT_MethodTypeInError :
2320 st->print("signature_index=%d", method_type_index_at(index));
2321 break;
2322 case JVM_CONSTANT_Dynamic :
2323 case JVM_CONSTANT_DynamicInError :
2324 {
2325 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2326 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2327 int argc = bootstrap_argument_count_at(index);
2328 if (argc > 0) {
2329 for (int arg_i = 0; arg_i < argc; arg_i++) {
2330 int arg = bootstrap_argument_index_at(index, arg_i);
2331 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2332 }
2333 st->print("}");
2334 }
2335 }
2336 break;
2337 case JVM_CONSTANT_InvokeDynamic :
2338 {
2339 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2340 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2341 int argc = bootstrap_argument_count_at(index);
2342 if (argc > 0) {
2343 for (int arg_i = 0; arg_i < argc; arg_i++) {
2344 int arg = bootstrap_argument_index_at(index, arg_i);
2345 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2346 }
2347 st->print("}");
2348 }
2349 }
2350 break;
2351 default:
2352 ShouldNotReachHere();
2353 break;
2354 }
2355 st->cr();
2356}
2357
2358void ConstantPool::print_value_on(outputStream* st) const {
2359 assert(is_constantPool(), "must be constantPool");
2360 st->print("constant pool [%d]", length());
2361 if (has_preresolution()) st->print("/preresolution");
2362 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2363 print_address_on(st);
2364 if (pool_holder() != NULL) {
2365 st->print(" for ");
2366 pool_holder()->print_value_on(st);
2367 bool extra = (pool_holder()->constants() != this);
2368 if (extra) st->print(" (extra)");
2369 }
2370 if (cache() != NULL) {
2371 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2372 }
2373}
2374
2375#if INCLUDE_SERVICES
2376// Size Statistics
2377void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2378 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2379 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2380 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2381 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2382 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2383
2384 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2385 sz->_cp_refmap_bytes;
2386 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2387}
2388#endif // INCLUDE_SERVICES
2389
2390// Verification
2391
2392void ConstantPool::verify_on(outputStream* st) {
2393 guarantee(is_constantPool(), "object must be constant pool");
2394 for (int i = 0; i< length(); i++) {
2395 constantTag tag = tag_at(i);
2396 if (tag.is_klass() || tag.is_unresolved_klass()) {
2397 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2398 } else if (tag.is_symbol()) {
2399 CPSlot entry = slot_at(i);
2400 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2401 } else if (tag.is_string()) {
2402 CPSlot entry = slot_at(i);
2403 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2404 }
2405 }
2406 if (pool_holder() != NULL) {
2407 // Note: pool_holder() can be NULL in temporary constant pools
2408 // used during constant pool merging
2409 guarantee(pool_holder()->is_klass(), "should be klass");
2410 }
2411}
2412
2413
2414SymbolHashMap::~SymbolHashMap() {
2415 SymbolHashMapEntry* next;
2416 for (int i = 0; i < _table_size; i++) {
2417 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
2418 next = cur->next();
2419 delete(cur);
2420 }
2421 }
2422 FREE_C_HEAP_ARRAY(SymbolHashMapBucket, _buckets);
2423}
2424
2425void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2426 char *str = sym->as_utf8();
2427 unsigned int hash = compute_hash(str, sym->utf8_length());
2428 unsigned int index = hash % table_size();
2429
2430 // check if already in map
2431 // we prefer the first entry since it is more likely to be what was used in
2432 // the class file
2433 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2434 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2435 if (en->hash() == hash && en->symbol() == sym) {
2436 return; // already there
2437 }
2438 }
2439
2440 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2441 entry->set_next(bucket(index));
2442 _buckets[index].set_entry(entry);
2443 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2444}
2445
2446SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2447 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2448 char *str = sym->as_utf8();
2449 int len = sym->utf8_length();
2450 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2451 unsigned int index = hash % table_size();
2452 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2453 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2454 if (en->hash() == hash && en->symbol() == sym) {
2455 return en;
2456 }
2457 }
2458 return NULL;
2459}
2460
2461void SymbolHashMap::initialize_table(int table_size) {
2462 _table_size = table_size;
2463 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
2464 for (int index = 0; index < table_size; index++) {
2465 _buckets[index].clear();
2466 }
2467}
2468