1 /*
2 * Copyright (c) 1997, 2017, 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 "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/linkResolver.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/heapInspection.hpp"
36 #include "memory/metadataFactory.hpp"
37 #include "memory/metaspaceClosure.hpp"
38 #include "memory/metaspaceShared.hpp"
39 #include "memory/oopFactory.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "oops/constantPool.hpp"
42 #include "oops/instanceKlass.hpp"
43 #include "oops/objArrayKlass.hpp"
44 #include "oops/objArrayOop.inline.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "runtime/fieldType.hpp"
47 #include "runtime/init.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/signature.hpp"
50 #include "runtime/vframe.hpp"
51 #include "utilities/copy.hpp"
52 #if INCLUDE_ALL_GCS
53 #include "gc/g1/g1SATBCardTableModRefBS.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
57 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
58 int size = ConstantPool::size(length);
59 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
60 }
61
62 #ifdef ASSERT
63
64 // MetaspaceObj allocation invariant is calloc equivalent memory
65 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
66 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
67 assert(tags != NULL, "invariant");
68 const int length = tags->length();
69 for (int index = 0; index < length; ++index) {
70 if (JVM_CONSTANT_Invalid != tags->at(index)) {
71 return false;
72 }
73 }
74 return true;
75 }
76
77 #endif
78
79 ConstantPool::ConstantPool(Array<u1>* tags) :
80 _tags(tags),
81 _length(tags->length()) {
82
83 assert(_tags != NULL, "invariant");
84 assert(tags->length() == _length, "invariant");
85 assert(tag_array_is_zero_initialized(tags), "invariant");
86 assert(0 == flags(), "invariant");
87 assert(0 == version(), "invariant");
88 assert(NULL == _pool_holder, "invariant");
89 }
90
91 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
92 if (cache() != NULL) {
93 MetadataFactory::free_metadata(loader_data, cache());
94 set_cache(NULL);
95 }
96
97 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
98 set_resolved_klasses(NULL);
99
100 MetadataFactory::free_array<jushort>(loader_data, operands());
101 set_operands(NULL);
102
103 release_C_heap_structures();
104
105 // free tag array
106 MetadataFactory::free_array<u1>(loader_data, tags());
107 set_tags(NULL);
108 }
109
110 void ConstantPool::release_C_heap_structures() {
111 // walk constant pool and decrement symbol reference counts
112 unreference_symbols();
113 }
114
115 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
116 log_trace(cds)("Iter(ConstantPool): %p", this);
117
118 it->push(&_tags, MetaspaceClosure::_writable);
119 it->push(&_cache);
120 it->push(&_pool_holder);
121 it->push(&_operands);
122 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
123
124 for (int i = 0; i < length(); i++) {
125 // The only MSO's embedded in the CP entries are Symbols:
126 // JVM_CONSTANT_String (normal and pseudo)
127 // JVM_CONSTANT_Utf8
128 constantTag ctag = tag_at(i);
129 if (ctag.is_string() || ctag.is_utf8()) {
130 it->push(symbol_at_addr(i));
131 }
132 }
133 }
134
135 objArrayOop ConstantPool::resolved_references() const {
136 return (objArrayOop)_cache->resolved_references();
137 }
138
139 // Called from outside constant pool resolution where a resolved_reference array
140 // may not be present.
141 objArrayOop ConstantPool::resolved_references_or_null() const {
142 if (_cache == NULL) {
143 return NULL;
144 } else {
145 return (objArrayOop)_cache->resolved_references();
146 }
147 }
148
149 // Create resolved_references array and mapping array for original cp indexes
150 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
151 // to map it back for resolving and some unlikely miscellaneous uses.
152 // The objects created by invokedynamic are appended to this list.
153 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
154 const intStack& reference_map,
155 int constant_pool_map_length,
156 TRAPS) {
157 // Initialized the resolved object cache.
158 int map_length = reference_map.length();
159 if (map_length > 0) {
160 // Only need mapping back to constant pool entries. The map isn't used for
161 // invokedynamic resolved_reference entries. For invokedynamic entries,
162 // the constant pool cache index has the mapping back to both the constant
163 // pool and to the resolved reference index.
164 if (constant_pool_map_length > 0) {
165 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
166
167 for (int i = 0; i < constant_pool_map_length; i++) {
168 int x = reference_map.at(i);
169 assert(x == (int)(jushort) x, "klass index is too big");
170 om->at_put(i, (jushort)x);
171 }
172 set_reference_map(om);
173 }
174
175 // Create Java array for holding resolved strings, methodHandles,
176 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
177 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
178 Handle refs_handle (THREAD, (oop)stom); // must handleize.
179 set_resolved_references(loader_data->add_handle(refs_handle));
180 }
181 }
182
183 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
184 // A ConstantPool can't possibly have 0xffff valid class entries,
185 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
186 // entry for the class's name. So at most we will have 0xfffe class entries.
187 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
188 // UnresolvedKlass entries that are temporarily created during class redefinition.
189 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
190 assert(resolved_klasses() == NULL, "sanity");
191 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
192 set_resolved_klasses(rk);
193 }
194
195 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
196 int len = length();
197 int num_klasses = 0;
198 for (int i = 1; i <len; i++) {
199 switch (tag_at(i).value()) {
200 case JVM_CONSTANT_ClassIndex:
201 {
202 const int class_index = klass_index_at(i);
203 unresolved_klass_at_put(i, class_index, num_klasses++);
204 }
205 break;
206 #ifndef PRODUCT
207 case JVM_CONSTANT_Class:
208 case JVM_CONSTANT_UnresolvedClass:
209 case JVM_CONSTANT_UnresolvedClassInError:
210 // All of these should have been reverted back to ClassIndex before calling
211 // this function.
212 ShouldNotReachHere();
213 #endif
214 }
215 }
216 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
217 }
218
219 // Anonymous class support:
220 void ConstantPool::klass_at_put(int class_index, int name_index, int resolved_klass_index, Klass* k, Symbol* name) {
221 assert(is_within_bounds(class_index), "index out of bounds");
222 assert(is_within_bounds(name_index), "index out of bounds");
223 assert((resolved_klass_index & 0xffff0000) == 0, "must be");
224 *int_at_addr(class_index) =
225 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index);
226
227 symbol_at_put(name_index, name);
228 name->increment_refcount();
229 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
230 OrderAccess::release_store(adr, k);
231
232 // The interpreter assumes when the tag is stored, the klass is resolved
233 // and the Klass* non-NULL, so we need hardware store ordering here.
234 if (k != NULL) {
235 release_tag_at_put(class_index, JVM_CONSTANT_Class);
236 } else {
237 release_tag_at_put(class_index, JVM_CONSTANT_UnresolvedClass);
238 }
239 }
240
241 // Anonymous 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 OrderAccess::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 release_tag_at_put(class_index, JVM_CONSTANT_Class);
252 }
253
254 #if INCLUDE_CDS_JAVA_HEAP
255 // Archive the resolved references
256 void ConstantPool::archive_resolved_references(Thread* THREAD) {
257 if (_cache == NULL) {
258 return; // nothing to do
259 }
260
261 InstanceKlass *ik = pool_holder();
262 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() ||
263 ik->is_shared_app_class())) {
264 // Archiving resolved references for classes from non-builtin loaders
265 // is not yet supported.
266 set_resolved_references(NULL);
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 p = rr->obj_at(i);
277 rr->obj_at_put(i, NULL);
278 if (p != NULL && i < ref_map_len) {
279 int index = object_to_cp_index(i);
280 // Skip the entry if the string hash code is 0 since the string
281 // is not included in the shared string_table, see StringTable::copy_shared_string.
282 if (tag_at(index).is_string() && java_lang_String::hash_code(p) != 0) {
283 oop op = StringTable::create_archived_string(p, THREAD);
284 // If the String object is not archived (possibly too large),
285 // NULL is returned. Also set it in the array, so we won't
286 // have a 'bad' reference in the archived resolved_reference
287 // array.
288 rr->obj_at_put(i, op);
289 }
290 }
291 }
292
293 oop archived = MetaspaceShared::archive_heap_object(rr, THREAD);
294 _cache->set_archived_references(archived);
295 set_resolved_references(NULL);
296 }
297 }
298
299 void ConstantPool::resolve_class_constants(TRAPS) {
300 assert(DumpSharedSpaces, "used during dump time only");
301 // The _cache may be NULL if the _pool_holder klass fails verification
302 // at dump time due to missing dependencies.
303 if (cache() == NULL || reference_map() == NULL) {
304 return; // nothing to do
305 }
306
307 constantPoolHandle cp(THREAD, this);
308 for (int index = 1; index < length(); index++) { // Index 0 is unused
309 if (tag_at(index).is_string() && !cp->is_pseudo_string_at(index)) {
310 int cache_index = cp->cp_to_object_index(index);
311 string_at_impl(cp, index, cache_index, CHECK);
312 }
313 }
314 }
315 #endif
316
317 // CDS support. Create a new resolved_references array.
318 void ConstantPool::restore_unshareable_info(TRAPS) {
319 assert(is_constantPool(), "ensure C++ vtable is restored");
320 assert(on_stack(), "should always be set for shared constant pools");
321 assert(is_shared(), "should always be set for shared constant pools");
322 assert(_cache != NULL, "constant pool _cache should not be NULL");
323
324 // Only create the new resolved references array if it hasn't been attempted before
325 if (resolved_references() != NULL) return;
326
327 // restore the C++ vtable from the shared archive
328 restore_vtable();
329
330 if (SystemDictionary::Object_klass_loaded()) {
331 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
332 #if INCLUDE_CDS_JAVA_HEAP
333 if (MetaspaceShared::open_archive_heap_region_mapped() &&
334 _cache->archived_references() != NULL) {
335 oop archived = _cache->archived_references();
336 // Make sure GC knows the cached object is now live. This is necessary after
337 // initial GC marking and during concurrent marking as strong roots are only
338 // scanned during initial marking (at the start of the GC marking).
339 assert(UseG1GC, "Requires G1 GC");
340 G1SATBCardTableModRefBS::enqueue(archived);
341 // Create handle for the archived resolved reference array object
342 Handle refs_handle(THREAD, (oop)archived);
343 set_resolved_references(loader_data->add_handle(refs_handle));
344 } else
345 #endif
346 {
347 // No mapped archived resolved reference array
348 // Recreate the object array and add to ClassLoaderData.
349 int map_length = resolved_reference_length();
350 if (map_length > 0) {
351 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
352 Handle refs_handle(THREAD, (oop)stom); // must handleize.
353 set_resolved_references(loader_data->add_handle(refs_handle));
354 }
355 }
356 }
357 }
358
359 void ConstantPool::remove_unshareable_info() {
360 // Resolved references are not in the shared archive.
361 // Save the length for restoration. It is not necessarily the same length
362 // as reference_map.length() if invokedynamic is saved. It is needed when
363 // re-creating the resolved reference array if archived heap data cannot be map
364 // at runtime.
365 set_resolved_reference_length(
366 resolved_references() != NULL ? resolved_references()->length() : 0);
367
368 // If archiving heap objects is not allowed, clear the resolved references.
369 // Otherwise, it is cleared after the resolved references array is cached
370 // (see archive_resolved_references()).
371 if (!MetaspaceShared::is_heap_object_archiving_allowed()) {
372 set_resolved_references(NULL);
373 }
374
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 int num_klasses = 0;
381 for (int index = 1; index < length(); index++) { // Index 0 is unused
382 assert(!tag_at(index).is_unresolved_klass_in_error(), "This must not happen during dump time");
383 if (tag_at(index).is_klass()) {
384 // This class was resolved as a side effect of executing Java code
385 // during dump time. We need to restore it back to an UnresolvedClass,
386 // so that the proper class loading and initialization can happen
387 // at runtime.
388 CPKlassSlot kslot = klass_slot_at(index);
389 int resolved_klass_index = kslot.resolved_klass_index();
390 int name_index = kslot.name_index();
391 assert(tag_at(name_index).is_symbol(), "sanity");
392 resolved_klasses()->at_put(resolved_klass_index, NULL);
393 tag_at_put(index, JVM_CONSTANT_UnresolvedClass);
394 assert(klass_name_at(index) == symbol_at(name_index), "sanity");
395 }
396 }
397 if (cache() != NULL) {
398 cache()->remove_unshareable_info();
399 }
400 }
401
402 int ConstantPool::cp_to_object_index(int cp_index) {
403 // this is harder don't do this so much.
404 int i = reference_map()->find(cp_index);
405 // We might not find the index for jsr292 call.
406 return (i < 0) ? _no_index_sentinel : i;
407 }
408
409 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
410 resolved_references()->obj_at_put(obj_index, str);
411 }
412
413 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
414 ResourceMark rm;
415 int line_number = -1;
416 const char * source_file = NULL;
417 if (JavaThread::current()->has_last_Java_frame()) {
418 // try to identify the method which called this function.
419 vframeStream vfst(JavaThread::current());
420 if (!vfst.at_end()) {
421 line_number = vfst.method()->line_number_from_bci(vfst.bci());
422 Symbol* s = vfst.method()->method_holder()->source_file_name();
423 if (s != NULL) {
424 source_file = s->as_C_string();
425 }
426 }
427 }
428 if (k != this_cp->pool_holder()) {
429 // only print something if the classes are different
430 if (source_file != NULL) {
431 log_debug(class, resolve)("%s %s %s:%d",
432 this_cp->pool_holder()->external_name(),
433 k->external_name(), source_file, line_number);
434 } else {
435 log_debug(class, resolve)("%s %s",
436 this_cp->pool_holder()->external_name(),
437 k->external_name());
438 }
439 }
440 }
441
442 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
443 bool save_resolution_error, TRAPS) {
444 assert(THREAD->is_Java_thread(), "must be a Java thread");
445
446 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
447 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
448 // the entry and tag is not updated atomicly.
449 CPKlassSlot kslot = this_cp->klass_slot_at(which);
450 int resolved_klass_index = kslot.resolved_klass_index();
451 int name_index = kslot.name_index();
452 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
453
454 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
455 if (klass != NULL) {
456 return klass;
457 }
458
459 // This tag doesn't change back to unresolved class unless at a safepoint.
460 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
461 // The original attempt to resolve this constant pool entry failed so find the
462 // class of the original error and throw another error of the same class
463 // (JVMS 5.4.3).
464 // If there is a detail message, pass that detail message to the error.
465 // The JVMS does not strictly require us to duplicate the same detail message,
466 // or any internal exception fields such as cause or stacktrace. But since the
467 // detail message is often a class name or other literal string, we will repeat it
468 // if we can find it in the symbol table.
469 throw_resolution_error(this_cp, which, CHECK_0);
470 ShouldNotReachHere();
471 }
472
473 Handle mirror_handle;
474 Symbol* name = this_cp->symbol_at(name_index);
475 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
476 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
477 Klass* k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
478 if (!HAS_PENDING_EXCEPTION) {
479 // preserve the resolved klass from unloading
480 mirror_handle = Handle(THREAD, k->java_mirror());
481 // Do access check for klasses
482 verify_constant_pool_resolve(this_cp, k, THREAD);
483 }
484
485 // Failed to resolve class. We must record the errors so that subsequent attempts
486 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
487 if (HAS_PENDING_EXCEPTION) {
488 if (save_resolution_error) {
489 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
490 // If CHECK_NULL above doesn't return the exception, that means that
491 // some other thread has beaten us and has resolved the class.
492 // To preserve old behavior, we return the resolved class.
493 klass = this_cp->resolved_klasses()->at(resolved_klass_index);
494 assert(klass != NULL, "must be resolved if exception was cleared");
495 return klass;
496 } else {
497 return NULL; // return the pending exception
498 }
499 }
500
501 // Make this class loader depend upon the class loader owning the class reference
502 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
503 this_key->record_dependency(k, CHECK_NULL); // Can throw OOM
504
505 // logging for class+resolve.
506 if (log_is_enabled(Debug, class, resolve)){
507 trace_class_resolution(this_cp, k);
508 }
509 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
510 OrderAccess::release_store(adr, k);
511 // The interpreter assumes when the tag is stored, the klass is resolved
512 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
513 // hardware store ordering here.
514 this_cp->release_tag_at_put(which, JVM_CONSTANT_Class);
515 return k;
516 }
517
518
519 // Does not update ConstantPool* - to avoid any exception throwing. Used
520 // by compiler and exception handling. Also used to avoid classloads for
521 // instanceof operations. Returns NULL if the class has not been loaded or
522 // if the verification of constant pool failed
523 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
524 CPKlassSlot kslot = this_cp->klass_slot_at(which);
525 int resolved_klass_index = kslot.resolved_klass_index();
526 int name_index = kslot.name_index();
527 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
528
529 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
530 if (k != NULL) {
531 return k;
532 } else {
533 Thread *thread = Thread::current();
534 Symbol* name = this_cp->symbol_at(name_index);
535 oop loader = this_cp->pool_holder()->class_loader();
536 oop protection_domain = this_cp->pool_holder()->protection_domain();
537 Handle h_prot (thread, protection_domain);
538 Handle h_loader (thread, loader);
539 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
540
541 if (k != NULL) {
542 // Make sure that resolving is legal
543 EXCEPTION_MARK;
544 // return NULL if verification fails
545 verify_constant_pool_resolve(this_cp, k, THREAD);
546 if (HAS_PENDING_EXCEPTION) {
547 CLEAR_PENDING_EXCEPTION;
548 return NULL;
549 }
550 return k;
551 } else {
552 return k;
553 }
554 }
555 }
556
557
558 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) {
559 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which));
560 }
561
562
563 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
564 int which) {
565 if (cpool->cache() == NULL) return NULL; // nothing to load yet
566 int cache_index = decode_cpcache_index(which, true);
567 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
568 // FIXME: should be an assert
569 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
570 return NULL;
571 }
572 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
573 return e->method_if_resolved(cpool);
574 }
575
576
577 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
578 if (cpool->cache() == NULL) return false; // nothing to load yet
579 int cache_index = decode_cpcache_index(which, true);
580 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
581 return e->has_appendix();
582 }
583
584 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
585 if (cpool->cache() == NULL) return NULL; // nothing to load yet
586 int cache_index = decode_cpcache_index(which, true);
587 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
588 return e->appendix_if_resolved(cpool);
589 }
590
591
592 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
593 if (cpool->cache() == NULL) return false; // nothing to load yet
594 int cache_index = decode_cpcache_index(which, true);
595 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
596 return e->has_method_type();
597 }
598
599 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
600 if (cpool->cache() == NULL) return NULL; // nothing to load yet
601 int cache_index = decode_cpcache_index(which, true);
602 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
603 return e->method_type_if_resolved(cpool);
604 }
605
606
607 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
608 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
609 return symbol_at(name_index);
610 }
611
612
613 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
614 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
615 return symbol_at(signature_index);
616 }
617
618
619 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
620 int i = which;
621 if (!uncached && cache() != NULL) {
622 if (ConstantPool::is_invokedynamic_index(which)) {
623 // Invokedynamic index is index into the constant pool cache
624 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
625 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
626 assert(tag_at(pool_index).is_name_and_type(), "");
627 return pool_index;
628 }
629 // change byte-ordering and go via cache
630 i = remap_instruction_operand_from_cache(which);
631 } else {
632 if (tag_at(which).is_invoke_dynamic()) {
633 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
634 assert(tag_at(pool_index).is_name_and_type(), "");
635 return pool_index;
636 }
637 }
638 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
639 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
640 jint ref_index = *int_at_addr(i);
641 return extract_high_short_from_int(ref_index);
642 }
643
644 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
645 int pool_index = which;
646 if (!uncached && cache() != NULL) {
647 if (ConstantPool::is_invokedynamic_index(which)) {
648 // Invokedynamic index is index into resolved_references
649 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
650 } else {
651 // change byte-ordering and go via cache
652 pool_index = remap_instruction_operand_from_cache(which);
653 }
654 }
655 return tag_at(pool_index);
656 }
657
658 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
659 guarantee(!ConstantPool::is_invokedynamic_index(which),
660 "an invokedynamic instruction does not have a klass");
661 int i = which;
662 if (!uncached && cache() != NULL) {
663 // change byte-ordering and go via cache
664 i = remap_instruction_operand_from_cache(which);
665 }
666 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
667 jint ref_index = *int_at_addr(i);
668 return extract_low_short_from_int(ref_index);
669 }
670
671
672
673 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
674 int cpc_index = operand;
675 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
676 assert((int)(u2)cpc_index == cpc_index, "clean u2");
677 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
678 return member_index;
679 }
680
681
682 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
683 if (k->is_instance_klass() || k->is_objArray_klass()) {
684 InstanceKlass* holder = this_cp->pool_holder();
685 Klass* elem = k->is_instance_klass() ? k : ObjArrayKlass::cast(k)->bottom_klass();
686
687 // The element type could be a typeArray - we only need the access check if it is
688 // an reference to another class
689 if (elem->is_instance_klass()) {
690 LinkResolver::check_klass_accessability(holder, elem, CHECK);
691 }
692 }
693 }
694
695
696 int ConstantPool::name_ref_index_at(int which_nt) {
697 jint ref_index = name_and_type_at(which_nt);
698 return extract_low_short_from_int(ref_index);
699 }
700
701
702 int ConstantPool::signature_ref_index_at(int which_nt) {
703 jint ref_index = name_and_type_at(which_nt);
704 return extract_high_short_from_int(ref_index);
705 }
706
707
708 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
709 return klass_at(klass_ref_index_at(which), THREAD);
710 }
711
712 Symbol* ConstantPool::klass_name_at(int which) const {
713 return symbol_at(klass_slot_at(which).name_index());
714 }
715
716 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
717 jint ref_index = klass_ref_index_at(which);
718 return klass_at_noresolve(ref_index);
719 }
720
721 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
722 jint ref_index = uncached_klass_ref_index_at(which);
723 return klass_at_noresolve(ref_index);
724 }
725
726 char* ConstantPool::string_at_noresolve(int which) {
727 return unresolved_string_at(which)->as_C_string();
728 }
729
730 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
731 return FieldType::basic_type(symbol_at(which));
732 }
733
734
735 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
736 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
737 if (this_cp->tag_at(index).is_string()) {
738 this_cp->string_at(index, CHECK);
739 }
740 }
741 }
742
743 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
744 // Dig out the detailed message to reuse if possible
745 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
746 if (message != NULL) {
747 return message;
748 }
749
750 // Return specific message for the tag
751 switch (tag.value()) {
752 case JVM_CONSTANT_UnresolvedClass:
753 // return the class name in the error message
754 message = this_cp->klass_name_at(which);
755 break;
756 case JVM_CONSTANT_MethodHandle:
757 // return the method handle name in the error message
758 message = this_cp->method_handle_name_ref_at(which);
759 break;
760 case JVM_CONSTANT_MethodType:
761 // return the method type signature in the error message
762 message = this_cp->method_type_signature_at(which);
763 break;
764 default:
765 ShouldNotReachHere();
766 }
767
768 return message;
769 }
770
771 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
772 Symbol* message = NULL;
773 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
774 assert(error != NULL && message != NULL, "checking");
775 CLEAR_PENDING_EXCEPTION;
776 ResourceMark rm;
777 THROW_MSG(error, message->as_C_string());
778 }
779
780 // If resolution for Class, MethodHandle or MethodType fails, save the exception
781 // in the resolution error table, so that the same exception is thrown again.
782 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
783 constantTag tag, TRAPS) {
784 Symbol* error = PENDING_EXCEPTION->klass()->name();
785
786 int error_tag = tag.error_value();
787
788 if (!PENDING_EXCEPTION->
789 is_a(SystemDictionary::LinkageError_klass())) {
790 // Just throw the exception and don't prevent these classes from
791 // being loaded due to virtual machine errors like StackOverflow
792 // and OutOfMemoryError, etc, or if the thread was hit by stop()
793 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
794 } else if (this_cp->tag_at(which).value() != error_tag) {
795 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
796 SystemDictionary::add_resolution_error(this_cp, which, error, message);
797 // CAS in the tag. If a thread beat us to registering this error that's fine.
798 // If another thread resolved the reference, this is a race condition. This
799 // thread may have had a security manager or something temporary.
800 // This doesn't deterministically get an error. So why do we save this?
801 // We save this because jvmti can add classes to the bootclass path after
802 // this error, so it needs to get the same error if the error is first.
803 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
804 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
805 if (old_tag != error_tag && old_tag != tag.value()) {
806 // MethodHandles and MethodType doesn't change to resolved version.
807 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
808 // Forget the exception and use the resolved class.
809 CLEAR_PENDING_EXCEPTION;
810 }
811 } else {
812 // some other thread put this in error state
813 throw_resolution_error(this_cp, which, CHECK);
814 }
815 }
816
817 // Called to resolve constants in the constant pool and return an oop.
818 // Some constant pool entries cache their resolved oop. This is also
819 // called to create oops from constants to use in arguments for invokedynamic
820 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) {
821 oop result_oop = NULL;
822 Handle throw_exception;
823
824 if (cache_index == _possible_index_sentinel) {
825 // It is possible that this constant is one which is cached in the objects.
826 // We'll do a linear search. This should be OK because this usage is rare.
827 assert(index > 0, "valid index");
828 cache_index = this_cp->cp_to_object_index(index);
829 }
830 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
831 assert(index == _no_index_sentinel || index >= 0, "");
832
833 if (cache_index >= 0) {
834 result_oop = this_cp->resolved_references()->obj_at(cache_index);
835 if (result_oop != NULL) {
836 return result_oop;
837 // That was easy...
838 }
839 index = this_cp->object_to_cp_index(cache_index);
840 }
841
842 jvalue prim_value; // temp used only in a few cases below
843
844 constantTag tag = this_cp->tag_at(index);
845
846 switch (tag.value()) {
847
848 case JVM_CONSTANT_UnresolvedClass:
849 case JVM_CONSTANT_UnresolvedClassInError:
850 case JVM_CONSTANT_Class:
851 {
852 assert(cache_index == _no_index_sentinel, "should not have been set");
853 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
854 // ldc wants the java mirror.
855 result_oop = resolved->java_mirror();
856 break;
857 }
858
859 case JVM_CONSTANT_String:
860 assert(cache_index != _no_index_sentinel, "should have been set");
861 if (this_cp->is_pseudo_string_at(index)) {
862 result_oop = this_cp->pseudo_string_at(index, cache_index);
863 break;
864 }
865 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
866 break;
867
868 case JVM_CONSTANT_MethodHandleInError:
869 case JVM_CONSTANT_MethodTypeInError:
870 {
871 throw_resolution_error(this_cp, index, CHECK_NULL);
872 break;
873 }
874
875 case JVM_CONSTANT_MethodHandle:
876 {
877 int ref_kind = this_cp->method_handle_ref_kind_at(index);
878 int callee_index = this_cp->method_handle_klass_index_at(index);
879 Symbol* name = this_cp->method_handle_name_ref_at(index);
880 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
881 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
882 { ResourceMark rm(THREAD);
883 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
884 ref_kind, index, this_cp->method_handle_index_at(index),
885 callee_index, name->as_C_string(), signature->as_C_string());
886 }
887
888 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
889
890 // Check constant pool method consistency
891 if ((callee->is_interface() && m_tag.is_method()) ||
892 ((!callee->is_interface() && m_tag.is_interface_method()))) {
893 ResourceMark rm(THREAD);
894 char buf[400];
895 jio_snprintf(buf, sizeof(buf),
896 "Inconsistent constant pool data in classfile for class %s. "
897 "Method %s%s at index %d is %s and should be %s",
898 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index,
899 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
900 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
901 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
902 }
903
904 Klass* klass = this_cp->pool_holder();
905 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
906 callee, name, signature,
907 THREAD);
908 result_oop = value();
909 if (HAS_PENDING_EXCEPTION) {
910 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
911 }
912 break;
913 }
914
915 case JVM_CONSTANT_MethodType:
916 {
917 Symbol* signature = this_cp->method_type_signature_at(index);
918 { ResourceMark rm(THREAD);
919 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
920 index, this_cp->method_type_index_at(index),
921 signature->as_C_string());
922 }
923 Klass* klass = this_cp->pool_holder();
924 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
925 result_oop = value();
926 if (HAS_PENDING_EXCEPTION) {
927 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
928 }
929 break;
930 }
931
932 case JVM_CONSTANT_Integer:
933 assert(cache_index == _no_index_sentinel, "should not have been set");
934 prim_value.i = this_cp->int_at(index);
935 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
936 break;
937
938 case JVM_CONSTANT_Float:
939 assert(cache_index == _no_index_sentinel, "should not have been set");
940 prim_value.f = this_cp->float_at(index);
941 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
942 break;
943
944 case JVM_CONSTANT_Long:
945 assert(cache_index == _no_index_sentinel, "should not have been set");
946 prim_value.j = this_cp->long_at(index);
947 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
948 break;
949
950 case JVM_CONSTANT_Double:
951 assert(cache_index == _no_index_sentinel, "should not have been set");
952 prim_value.d = this_cp->double_at(index);
953 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
954 break;
955
956 default:
957 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
958 this_cp(), index, cache_index, tag.value()));
959 assert(false, "unexpected constant tag");
960 break;
961 }
962
963 if (cache_index >= 0) {
964 // Benign race condition: resolved_references may already be filled in.
965 // The important thing here is that all threads pick up the same result.
966 // It doesn't matter which racing thread wins, as long as only one
967 // result is used by all threads, and all future queries.
968 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL);
969 if (old_result == NULL) {
970 return result_oop; // was installed
971 } else {
972 // Return the winning thread's result. This can be different than
973 // the result here for MethodHandles.
974 return old_result;
975 }
976 } else {
977 return result_oop;
978 }
979 }
980
981 oop ConstantPool::uncached_string_at(int which, TRAPS) {
982 Symbol* sym = unresolved_string_at(which);
983 oop str = StringTable::intern(sym, CHECK_(NULL));
984 assert(java_lang_String::is_instance(str), "must be string");
985 return str;
986 }
987
988
989 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) {
990 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
991
992 Handle bsm;
993 int argc;
994 {
995 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
996 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
997 // It is accompanied by the optional arguments.
998 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
999 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
1000 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
1001 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
1002 }
1003
1004 // Extract the optional static arguments.
1005 argc = this_cp->invoke_dynamic_argument_count_at(index);
1006 if (argc == 0) return bsm_oop;
1007
1008 bsm = Handle(THREAD, bsm_oop);
1009 }
1010
1011 objArrayHandle info;
1012 {
1013 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
1014 info = objArrayHandle(THREAD, info_oop);
1015 }
1016
1017 info->obj_at_put(0, bsm());
1018 for (int i = 0; i < argc; i++) {
1019 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
1020 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
1021 info->obj_at_put(1+i, arg_oop);
1022 }
1023
1024 return info();
1025 }
1026
1027 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1028 // If the string has already been interned, this entry will be non-null
1029 oop str = this_cp->resolved_references()->obj_at(obj_index);
1030 if (str != NULL) return str;
1031 Symbol* sym = this_cp->unresolved_string_at(which);
1032 str = StringTable::intern(sym, CHECK_(NULL));
1033 this_cp->string_at_put(which, obj_index, str);
1034 assert(java_lang_String::is_instance(str), "must be string");
1035 return str;
1036 }
1037
1038
1039 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1040 // Names are interned, so we can compare Symbol*s directly
1041 Symbol* cp_name = klass_name_at(which);
1042 return (cp_name == k->name());
1043 }
1044
1045
1046 // Iterate over symbols and decrement ones which are Symbol*s
1047 // This is done during GC.
1048 // Only decrement the UTF8 symbols. Strings point to
1049 // these symbols but didn't increment the reference count.
1050 void ConstantPool::unreference_symbols() {
1051 for (int index = 1; index < length(); index++) { // Index 0 is unused
1052 constantTag tag = tag_at(index);
1053 if (tag.is_symbol()) {
1054 symbol_at(index)->decrement_refcount();
1055 }
1056 }
1057 }
1058
1059
1060 // Compare this constant pool's entry at index1 to the constant pool
1061 // cp2's entry at index2.
1062 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1063 int index2, TRAPS) {
1064
1065 // The error tags are equivalent to non-error tags when comparing
1066 jbyte t1 = tag_at(index1).non_error_value();
1067 jbyte t2 = cp2->tag_at(index2).non_error_value();
1068
1069 if (t1 != t2) {
1070 // Not the same entry type so there is nothing else to check. Note
1071 // that this style of checking will consider resolved/unresolved
1072 // class pairs as different.
1073 // From the ConstantPool* API point of view, this is correct
1074 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1075 // plays out in the context of ConstantPool* merging.
1076 return false;
1077 }
1078
1079 switch (t1) {
1080 case JVM_CONSTANT_Class:
1081 {
1082 Klass* k1 = klass_at(index1, CHECK_false);
1083 Klass* k2 = cp2->klass_at(index2, CHECK_false);
1084 if (k1 == k2) {
1085 return true;
1086 }
1087 } break;
1088
1089 case JVM_CONSTANT_ClassIndex:
1090 {
1091 int recur1 = klass_index_at(index1);
1092 int recur2 = cp2->klass_index_at(index2);
1093 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1094 if (match) {
1095 return true;
1096 }
1097 } break;
1098
1099 case JVM_CONSTANT_Double:
1100 {
1101 jdouble d1 = double_at(index1);
1102 jdouble d2 = cp2->double_at(index2);
1103 if (d1 == d2) {
1104 return true;
1105 }
1106 } break;
1107
1108 case JVM_CONSTANT_Fieldref:
1109 case JVM_CONSTANT_InterfaceMethodref:
1110 case JVM_CONSTANT_Methodref:
1111 {
1112 int recur1 = uncached_klass_ref_index_at(index1);
1113 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1114 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1115 if (match) {
1116 recur1 = uncached_name_and_type_ref_index_at(index1);
1117 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1118 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1119 if (match) {
1120 return true;
1121 }
1122 }
1123 } break;
1124
1125 case JVM_CONSTANT_Float:
1126 {
1127 jfloat f1 = float_at(index1);
1128 jfloat f2 = cp2->float_at(index2);
1129 if (f1 == f2) {
1130 return true;
1131 }
1132 } break;
1133
1134 case JVM_CONSTANT_Integer:
1135 {
1136 jint i1 = int_at(index1);
1137 jint i2 = cp2->int_at(index2);
1138 if (i1 == i2) {
1139 return true;
1140 }
1141 } break;
1142
1143 case JVM_CONSTANT_Long:
1144 {
1145 jlong l1 = long_at(index1);
1146 jlong l2 = cp2->long_at(index2);
1147 if (l1 == l2) {
1148 return true;
1149 }
1150 } break;
1151
1152 case JVM_CONSTANT_NameAndType:
1153 {
1154 int recur1 = name_ref_index_at(index1);
1155 int recur2 = cp2->name_ref_index_at(index2);
1156 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1157 if (match) {
1158 recur1 = signature_ref_index_at(index1);
1159 recur2 = cp2->signature_ref_index_at(index2);
1160 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1161 if (match) {
1162 return true;
1163 }
1164 }
1165 } break;
1166
1167 case JVM_CONSTANT_StringIndex:
1168 {
1169 int recur1 = string_index_at(index1);
1170 int recur2 = cp2->string_index_at(index2);
1171 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1172 if (match) {
1173 return true;
1174 }
1175 } break;
1176
1177 case JVM_CONSTANT_UnresolvedClass:
1178 {
1179 Symbol* k1 = klass_name_at(index1);
1180 Symbol* k2 = cp2->klass_name_at(index2);
1181 if (k1 == k2) {
1182 return true;
1183 }
1184 } break;
1185
1186 case JVM_CONSTANT_MethodType:
1187 {
1188 int k1 = method_type_index_at(index1);
1189 int k2 = cp2->method_type_index_at(index2);
1190 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1191 if (match) {
1192 return true;
1193 }
1194 } break;
1195
1196 case JVM_CONSTANT_MethodHandle:
1197 {
1198 int k1 = method_handle_ref_kind_at(index1);
1199 int k2 = cp2->method_handle_ref_kind_at(index2);
1200 if (k1 == k2) {
1201 int i1 = method_handle_index_at(index1);
1202 int i2 = cp2->method_handle_index_at(index2);
1203 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1204 if (match) {
1205 return true;
1206 }
1207 }
1208 } break;
1209
1210 case JVM_CONSTANT_InvokeDynamic:
1211 {
1212 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1213 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1214 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1215 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1216 // separate statements and variables because CHECK_false is used
1217 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1218 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1219 return (match_entry && match_operand);
1220 } break;
1221
1222 case JVM_CONSTANT_String:
1223 {
1224 Symbol* s1 = unresolved_string_at(index1);
1225 Symbol* s2 = cp2->unresolved_string_at(index2);
1226 if (s1 == s2) {
1227 return true;
1228 }
1229 } break;
1230
1231 case JVM_CONSTANT_Utf8:
1232 {
1233 Symbol* s1 = symbol_at(index1);
1234 Symbol* s2 = cp2->symbol_at(index2);
1235 if (s1 == s2) {
1236 return true;
1237 }
1238 } break;
1239
1240 // Invalid is used as the tag for the second constant pool entry
1241 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1242 // not be seen by itself.
1243 case JVM_CONSTANT_Invalid: // fall through
1244
1245 default:
1246 ShouldNotReachHere();
1247 break;
1248 }
1249
1250 return false;
1251 } // end compare_entry_to()
1252
1253
1254 // Resize the operands array with delta_len and delta_size.
1255 // Used in RedefineClasses for CP merge.
1256 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1257 int old_len = operand_array_length(operands());
1258 int new_len = old_len + delta_len;
1259 int min_len = (delta_len > 0) ? old_len : new_len;
1260
1261 int old_size = operands()->length();
1262 int new_size = old_size + delta_size;
1263 int min_size = (delta_size > 0) ? old_size : new_size;
1264
1265 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1266 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1267
1268 // Set index in the resized array for existing elements only
1269 for (int idx = 0; idx < min_len; idx++) {
1270 int offset = operand_offset_at(idx); // offset in original array
1271 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1272 }
1273 // Copy the bootstrap specifiers only
1274 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1275 new_ops->adr_at(2*new_len),
1276 (min_size - 2*min_len) * sizeof(u2));
1277 // Explicitly deallocate old operands array.
1278 // Note, it is not needed for 7u backport.
1279 if ( operands() != NULL) { // the safety check
1280 MetadataFactory::free_array<u2>(loader_data, operands());
1281 }
1282 set_operands(new_ops);
1283 } // end resize_operands()
1284
1285
1286 // Extend the operands array with the length and size of the ext_cp operands.
1287 // Used in RedefineClasses for CP merge.
1288 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1289 int delta_len = operand_array_length(ext_cp->operands());
1290 if (delta_len == 0) {
1291 return; // nothing to do
1292 }
1293 int delta_size = ext_cp->operands()->length();
1294
1295 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1296
1297 if (operand_array_length(operands()) == 0) {
1298 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1299 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1300 // The first element index defines the offset of second part
1301 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1302 set_operands(new_ops);
1303 } else {
1304 resize_operands(delta_len, delta_size, CHECK);
1305 }
1306
1307 } // end extend_operands()
1308
1309
1310 // Shrink the operands array to a smaller array with new_len length.
1311 // Used in RedefineClasses for CP merge.
1312 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1313 int old_len = operand_array_length(operands());
1314 if (new_len == old_len) {
1315 return; // nothing to do
1316 }
1317 assert(new_len < old_len, "shrunken operands array must be smaller");
1318
1319 int free_base = operand_next_offset_at(new_len - 1);
1320 int delta_len = new_len - old_len;
1321 int delta_size = 2*delta_len + free_base - operands()->length();
1322
1323 resize_operands(delta_len, delta_size, CHECK);
1324
1325 } // end shrink_operands()
1326
1327
1328 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1329 const constantPoolHandle& to_cp,
1330 TRAPS) {
1331
1332 int from_oplen = operand_array_length(from_cp->operands());
1333 int old_oplen = operand_array_length(to_cp->operands());
1334 if (from_oplen != 0) {
1335 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1336 // append my operands to the target's operands array
1337 if (old_oplen == 0) {
1338 // Can't just reuse from_cp's operand list because of deallocation issues
1339 int len = from_cp->operands()->length();
1340 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1341 Copy::conjoint_memory_atomic(
1342 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1343 to_cp->set_operands(new_ops);
1344 } else {
1345 int old_len = to_cp->operands()->length();
1346 int from_len = from_cp->operands()->length();
1347 int old_off = old_oplen * sizeof(u2);
1348 int from_off = from_oplen * sizeof(u2);
1349 // Use the metaspace for the destination constant pool
1350 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1351 int fillp = 0, len = 0;
1352 // first part of dest
1353 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1354 new_operands->adr_at(fillp),
1355 (len = old_off) * sizeof(u2));
1356 fillp += len;
1357 // first part of src
1358 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1359 new_operands->adr_at(fillp),
1360 (len = from_off) * sizeof(u2));
1361 fillp += len;
1362 // second part of dest
1363 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1364 new_operands->adr_at(fillp),
1365 (len = old_len - old_off) * sizeof(u2));
1366 fillp += len;
1367 // second part of src
1368 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1369 new_operands->adr_at(fillp),
1370 (len = from_len - from_off) * sizeof(u2));
1371 fillp += len;
1372 assert(fillp == new_operands->length(), "");
1373
1374 // Adjust indexes in the first part of the copied operands array.
1375 for (int j = 0; j < from_oplen; j++) {
1376 int offset = operand_offset_at(new_operands, old_oplen + j);
1377 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1378 offset += old_len; // every new tuple is preceded by old_len extra u2's
1379 operand_offset_at_put(new_operands, old_oplen + j, offset);
1380 }
1381
1382 // replace target operands array with combined array
1383 to_cp->set_operands(new_operands);
1384 }
1385 }
1386 } // end copy_operands()
1387
1388
1389 // Copy this constant pool's entries at start_i to end_i (inclusive)
1390 // to the constant pool to_cp's entries starting at to_i. A total of
1391 // (end_i - start_i) + 1 entries are copied.
1392 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1393 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1394
1395
1396 int dest_i = to_i; // leave original alone for debug purposes
1397
1398 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1399 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1400
1401 switch (from_cp->tag_at(src_i).value()) {
1402 case JVM_CONSTANT_Double:
1403 case JVM_CONSTANT_Long:
1404 // double and long take two constant pool entries
1405 src_i += 2;
1406 dest_i += 2;
1407 break;
1408
1409 default:
1410 // all others take one constant pool entry
1411 src_i++;
1412 dest_i++;
1413 break;
1414 }
1415 }
1416 copy_operands(from_cp, to_cp, CHECK);
1417
1418 } // end copy_cp_to_impl()
1419
1420
1421 // Copy this constant pool's entry at from_i to the constant pool
1422 // to_cp's entry at to_i.
1423 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1424 const constantPoolHandle& to_cp, int to_i,
1425 TRAPS) {
1426
1427 int tag = from_cp->tag_at(from_i).value();
1428 switch (tag) {
1429 case JVM_CONSTANT_ClassIndex:
1430 {
1431 jint ki = from_cp->klass_index_at(from_i);
1432 to_cp->klass_index_at_put(to_i, ki);
1433 } break;
1434
1435 case JVM_CONSTANT_Double:
1436 {
1437 jdouble d = from_cp->double_at(from_i);
1438 to_cp->double_at_put(to_i, d);
1439 // double takes two constant pool entries so init second entry's tag
1440 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1441 } break;
1442
1443 case JVM_CONSTANT_Fieldref:
1444 {
1445 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1446 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1447 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1448 } break;
1449
1450 case JVM_CONSTANT_Float:
1451 {
1452 jfloat f = from_cp->float_at(from_i);
1453 to_cp->float_at_put(to_i, f);
1454 } break;
1455
1456 case JVM_CONSTANT_Integer:
1457 {
1458 jint i = from_cp->int_at(from_i);
1459 to_cp->int_at_put(to_i, i);
1460 } break;
1461
1462 case JVM_CONSTANT_InterfaceMethodref:
1463 {
1464 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1465 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1466 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1467 } break;
1468
1469 case JVM_CONSTANT_Long:
1470 {
1471 jlong l = from_cp->long_at(from_i);
1472 to_cp->long_at_put(to_i, l);
1473 // long takes two constant pool entries so init second entry's tag
1474 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1475 } break;
1476
1477 case JVM_CONSTANT_Methodref:
1478 {
1479 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1480 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1481 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1482 } break;
1483
1484 case JVM_CONSTANT_NameAndType:
1485 {
1486 int name_ref_index = from_cp->name_ref_index_at(from_i);
1487 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1488 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1489 } break;
1490
1491 case JVM_CONSTANT_StringIndex:
1492 {
1493 jint si = from_cp->string_index_at(from_i);
1494 to_cp->string_index_at_put(to_i, si);
1495 } break;
1496
1497 case JVM_CONSTANT_Class:
1498 case JVM_CONSTANT_UnresolvedClass:
1499 case JVM_CONSTANT_UnresolvedClassInError:
1500 {
1501 // Revert to JVM_CONSTANT_ClassIndex
1502 int name_index = from_cp->klass_slot_at(from_i).name_index();
1503 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1504 to_cp->klass_index_at_put(to_i, name_index);
1505 } break;
1506
1507 case JVM_CONSTANT_String:
1508 {
1509 Symbol* s = from_cp->unresolved_string_at(from_i);
1510 to_cp->unresolved_string_at_put(to_i, s);
1511 } break;
1512
1513 case JVM_CONSTANT_Utf8:
1514 {
1515 Symbol* s = from_cp->symbol_at(from_i);
1516 // Need to increase refcount, the old one will be thrown away and deferenced
1517 s->increment_refcount();
1518 to_cp->symbol_at_put(to_i, s);
1519 } break;
1520
1521 case JVM_CONSTANT_MethodType:
1522 case JVM_CONSTANT_MethodTypeInError:
1523 {
1524 jint k = from_cp->method_type_index_at(from_i);
1525 to_cp->method_type_index_at_put(to_i, k);
1526 } break;
1527
1528 case JVM_CONSTANT_MethodHandle:
1529 case JVM_CONSTANT_MethodHandleInError:
1530 {
1531 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1532 int k2 = from_cp->method_handle_index_at(from_i);
1533 to_cp->method_handle_index_at_put(to_i, k1, k2);
1534 } break;
1535
1536 case JVM_CONSTANT_InvokeDynamic:
1537 {
1538 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1539 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1540 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1541 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1542 } break;
1543
1544 // Invalid is used as the tag for the second constant pool entry
1545 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1546 // not be seen by itself.
1547 case JVM_CONSTANT_Invalid: // fall through
1548
1549 default:
1550 {
1551 ShouldNotReachHere();
1552 } break;
1553 }
1554 } // end copy_entry_to()
1555
1556 // Search constant pool search_cp for an entry that matches this
1557 // constant pool's entry at pattern_i. Returns the index of a
1558 // matching entry or zero (0) if there is no matching entry.
1559 int ConstantPool::find_matching_entry(int pattern_i,
1560 const constantPoolHandle& search_cp, TRAPS) {
1561
1562 // index zero (0) is not used
1563 for (int i = 1; i < search_cp->length(); i++) {
1564 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1565 if (found) {
1566 return i;
1567 }
1568 }
1569
1570 return 0; // entry not found; return unused index zero (0)
1571 } // end find_matching_entry()
1572
1573
1574 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1575 // cp2's bootstrap specifier at idx2.
1576 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1577 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1578 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1579 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1580
1581 if (!match) {
1582 return false;
1583 }
1584 int argc = operand_argument_count_at(idx1);
1585 if (argc == cp2->operand_argument_count_at(idx2)) {
1586 for (int j = 0; j < argc; j++) {
1587 k1 = operand_argument_index_at(idx1, j);
1588 k2 = cp2->operand_argument_index_at(idx2, j);
1589 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1590 if (!match) {
1591 return false;
1592 }
1593 }
1594 return true; // got through loop; all elements equal
1595 }
1596 return false;
1597 } // end compare_operand_to()
1598
1599 // Search constant pool search_cp for a bootstrap specifier that matches
1600 // this constant pool's bootstrap specifier at pattern_i index.
1601 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1602 int ConstantPool::find_matching_operand(int pattern_i,
1603 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1604 for (int i = 0; i < search_len; i++) {
1605 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1606 if (found) {
1607 return i;
1608 }
1609 }
1610 return -1; // bootstrap specifier not found; return unused index (-1)
1611 } // end find_matching_operand()
1612
1613
1614 #ifndef PRODUCT
1615
1616 const char* ConstantPool::printable_name_at(int which) {
1617
1618 constantTag tag = tag_at(which);
1619
1620 if (tag.is_string()) {
1621 return string_at_noresolve(which);
1622 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1623 return klass_name_at(which)->as_C_string();
1624 } else if (tag.is_symbol()) {
1625 return symbol_at(which)->as_C_string();
1626 }
1627 return "";
1628 }
1629
1630 #endif // PRODUCT
1631
1632
1633 // JVMTI GetConstantPool support
1634
1635 // For debugging of constant pool
1636 const bool debug_cpool = false;
1637
1638 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1639
1640 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1641 const char* WARN_MSG = "Must not be such entry!";
1642 jint size = 0;
1643 u2 idx1, idx2;
1644
1645 for (jint idx = 1; idx < cnt; idx++) {
1646 jint ent_size = 0;
1647 u1 tag = *bytes++;
1648 size++; // count tag
1649
1650 printf("const #%03d, tag: %02d ", idx, tag);
1651 switch(tag) {
1652 case JVM_CONSTANT_Invalid: {
1653 printf("Invalid");
1654 break;
1655 }
1656 case JVM_CONSTANT_Unicode: {
1657 printf("Unicode %s", WARN_MSG);
1658 break;
1659 }
1660 case JVM_CONSTANT_Utf8: {
1661 u2 len = Bytes::get_Java_u2(bytes);
1662 char str[128];
1663 if (len > 127) {
1664 len = 127;
1665 }
1666 strncpy(str, (char *) (bytes+2), len);
1667 str[len] = '\0';
1668 printf("Utf8 \"%s\"", str);
1669 ent_size = 2 + len;
1670 break;
1671 }
1672 case JVM_CONSTANT_Integer: {
1673 u4 val = Bytes::get_Java_u4(bytes);
1674 printf("int %d", *(int *) &val);
1675 ent_size = 4;
1676 break;
1677 }
1678 case JVM_CONSTANT_Float: {
1679 u4 val = Bytes::get_Java_u4(bytes);
1680 printf("float %5.3ff", *(float *) &val);
1681 ent_size = 4;
1682 break;
1683 }
1684 case JVM_CONSTANT_Long: {
1685 u8 val = Bytes::get_Java_u8(bytes);
1686 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1687 ent_size = 8;
1688 idx++; // Long takes two cpool slots
1689 break;
1690 }
1691 case JVM_CONSTANT_Double: {
1692 u8 val = Bytes::get_Java_u8(bytes);
1693 printf("double %5.3fd", *(jdouble *)&val);
1694 ent_size = 8;
1695 idx++; // Double takes two cpool slots
1696 break;
1697 }
1698 case JVM_CONSTANT_Class: {
1699 idx1 = Bytes::get_Java_u2(bytes);
1700 printf("class #%03d", idx1);
1701 ent_size = 2;
1702 break;
1703 }
1704 case JVM_CONSTANT_String: {
1705 idx1 = Bytes::get_Java_u2(bytes);
1706 printf("String #%03d", idx1);
1707 ent_size = 2;
1708 break;
1709 }
1710 case JVM_CONSTANT_Fieldref: {
1711 idx1 = Bytes::get_Java_u2(bytes);
1712 idx2 = Bytes::get_Java_u2(bytes+2);
1713 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1714 ent_size = 4;
1715 break;
1716 }
1717 case JVM_CONSTANT_Methodref: {
1718 idx1 = Bytes::get_Java_u2(bytes);
1719 idx2 = Bytes::get_Java_u2(bytes+2);
1720 printf("Method #%03d, #%03d", idx1, idx2);
1721 ent_size = 4;
1722 break;
1723 }
1724 case JVM_CONSTANT_InterfaceMethodref: {
1725 idx1 = Bytes::get_Java_u2(bytes);
1726 idx2 = Bytes::get_Java_u2(bytes+2);
1727 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1728 ent_size = 4;
1729 break;
1730 }
1731 case JVM_CONSTANT_NameAndType: {
1732 idx1 = Bytes::get_Java_u2(bytes);
1733 idx2 = Bytes::get_Java_u2(bytes+2);
1734 printf("NameAndType #%03d, #%03d", idx1, idx2);
1735 ent_size = 4;
1736 break;
1737 }
1738 case JVM_CONSTANT_ClassIndex: {
1739 printf("ClassIndex %s", WARN_MSG);
1740 break;
1741 }
1742 case JVM_CONSTANT_UnresolvedClass: {
1743 printf("UnresolvedClass: %s", WARN_MSG);
1744 break;
1745 }
1746 case JVM_CONSTANT_UnresolvedClassInError: {
1747 printf("UnresolvedClassInErr: %s", WARN_MSG);
1748 break;
1749 }
1750 case JVM_CONSTANT_StringIndex: {
1751 printf("StringIndex: %s", WARN_MSG);
1752 break;
1753 }
1754 }
1755 printf(";\n");
1756 bytes += ent_size;
1757 size += ent_size;
1758 }
1759 printf("Cpool size: %d\n", size);
1760 fflush(0);
1761 return;
1762 } /* end print_cpool_bytes */
1763
1764
1765 // Returns size of constant pool entry.
1766 jint ConstantPool::cpool_entry_size(jint idx) {
1767 switch(tag_at(idx).value()) {
1768 case JVM_CONSTANT_Invalid:
1769 case JVM_CONSTANT_Unicode:
1770 return 1;
1771
1772 case JVM_CONSTANT_Utf8:
1773 return 3 + symbol_at(idx)->utf8_length();
1774
1775 case JVM_CONSTANT_Class:
1776 case JVM_CONSTANT_String:
1777 case JVM_CONSTANT_ClassIndex:
1778 case JVM_CONSTANT_UnresolvedClass:
1779 case JVM_CONSTANT_UnresolvedClassInError:
1780 case JVM_CONSTANT_StringIndex:
1781 case JVM_CONSTANT_MethodType:
1782 case JVM_CONSTANT_MethodTypeInError:
1783 return 3;
1784
1785 case JVM_CONSTANT_MethodHandle:
1786 case JVM_CONSTANT_MethodHandleInError:
1787 return 4; //tag, ref_kind, ref_index
1788
1789 case JVM_CONSTANT_Integer:
1790 case JVM_CONSTANT_Float:
1791 case JVM_CONSTANT_Fieldref:
1792 case JVM_CONSTANT_Methodref:
1793 case JVM_CONSTANT_InterfaceMethodref:
1794 case JVM_CONSTANT_NameAndType:
1795 return 5;
1796
1797 case JVM_CONSTANT_InvokeDynamic:
1798 // u1 tag, u2 bsm, u2 nt
1799 return 5;
1800
1801 case JVM_CONSTANT_Long:
1802 case JVM_CONSTANT_Double:
1803 return 9;
1804 }
1805 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1806 return 1;
1807 } /* end cpool_entry_size */
1808
1809
1810 // SymbolHashMap is used to find a constant pool index from a string.
1811 // This function fills in SymbolHashMaps, one for utf8s and one for
1812 // class names, returns size of the cpool raw bytes.
1813 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1814 SymbolHashMap *classmap) {
1815 jint size = 0;
1816
1817 for (u2 idx = 1; idx < length(); idx++) {
1818 u2 tag = tag_at(idx).value();
1819 size += cpool_entry_size(idx);
1820
1821 switch(tag) {
1822 case JVM_CONSTANT_Utf8: {
1823 Symbol* sym = symbol_at(idx);
1824 symmap->add_entry(sym, idx);
1825 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1826 break;
1827 }
1828 case JVM_CONSTANT_Class:
1829 case JVM_CONSTANT_UnresolvedClass:
1830 case JVM_CONSTANT_UnresolvedClassInError: {
1831 Symbol* sym = klass_name_at(idx);
1832 classmap->add_entry(sym, idx);
1833 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1834 break;
1835 }
1836 case JVM_CONSTANT_Long:
1837 case JVM_CONSTANT_Double: {
1838 idx++; // Both Long and Double take two cpool slots
1839 break;
1840 }
1841 }
1842 }
1843 return size;
1844 } /* end hash_utf8_entries_to */
1845
1846
1847 // Copy cpool bytes.
1848 // Returns:
1849 // 0, in case of OutOfMemoryError
1850 // -1, in case of internal error
1851 // > 0, count of the raw cpool bytes that have been copied
1852 int ConstantPool::copy_cpool_bytes(int cpool_size,
1853 SymbolHashMap* tbl,
1854 unsigned char *bytes) {
1855 u2 idx1, idx2;
1856 jint size = 0;
1857 jint cnt = length();
1858 unsigned char *start_bytes = bytes;
1859
1860 for (jint idx = 1; idx < cnt; idx++) {
1861 u1 tag = tag_at(idx).value();
1862 jint ent_size = cpool_entry_size(idx);
1863
1864 assert(size + ent_size <= cpool_size, "Size mismatch");
1865
1866 *bytes = tag;
1867 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
1868 switch(tag) {
1869 case JVM_CONSTANT_Invalid: {
1870 DBG(printf("JVM_CONSTANT_Invalid"));
1871 break;
1872 }
1873 case JVM_CONSTANT_Unicode: {
1874 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1875 DBG(printf("JVM_CONSTANT_Unicode"));
1876 break;
1877 }
1878 case JVM_CONSTANT_Utf8: {
1879 Symbol* sym = symbol_at(idx);
1880 char* str = sym->as_utf8();
1881 // Warning! It's crashing on x86 with len = sym->utf8_length()
1882 int len = (int) strlen(str);
1883 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1884 for (int i = 0; i < len; i++) {
1885 bytes[3+i] = (u1) str[i];
1886 }
1887 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1888 break;
1889 }
1890 case JVM_CONSTANT_Integer: {
1891 jint val = int_at(idx);
1892 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1893 break;
1894 }
1895 case JVM_CONSTANT_Float: {
1896 jfloat val = float_at(idx);
1897 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1898 break;
1899 }
1900 case JVM_CONSTANT_Long: {
1901 jlong val = long_at(idx);
1902 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1903 idx++; // Long takes two cpool slots
1904 break;
1905 }
1906 case JVM_CONSTANT_Double: {
1907 jdouble val = double_at(idx);
1908 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1909 idx++; // Double takes two cpool slots
1910 break;
1911 }
1912 case JVM_CONSTANT_Class:
1913 case JVM_CONSTANT_UnresolvedClass:
1914 case JVM_CONSTANT_UnresolvedClassInError: {
1915 *bytes = JVM_CONSTANT_Class;
1916 Symbol* sym = klass_name_at(idx);
1917 idx1 = tbl->symbol_to_value(sym);
1918 assert(idx1 != 0, "Have not found a hashtable entry");
1919 Bytes::put_Java_u2((address) (bytes+1), idx1);
1920 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1921 break;
1922 }
1923 case JVM_CONSTANT_String: {
1924 *bytes = JVM_CONSTANT_String;
1925 Symbol* sym = unresolved_string_at(idx);
1926 idx1 = tbl->symbol_to_value(sym);
1927 assert(idx1 != 0, "Have not found a hashtable entry");
1928 Bytes::put_Java_u2((address) (bytes+1), idx1);
1929 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1930 break;
1931 }
1932 case JVM_CONSTANT_Fieldref:
1933 case JVM_CONSTANT_Methodref:
1934 case JVM_CONSTANT_InterfaceMethodref: {
1935 idx1 = uncached_klass_ref_index_at(idx);
1936 idx2 = uncached_name_and_type_ref_index_at(idx);
1937 Bytes::put_Java_u2((address) (bytes+1), idx1);
1938 Bytes::put_Java_u2((address) (bytes+3), idx2);
1939 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1940 break;
1941 }
1942 case JVM_CONSTANT_NameAndType: {
1943 idx1 = name_ref_index_at(idx);
1944 idx2 = signature_ref_index_at(idx);
1945 Bytes::put_Java_u2((address) (bytes+1), idx1);
1946 Bytes::put_Java_u2((address) (bytes+3), idx2);
1947 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1948 break;
1949 }
1950 case JVM_CONSTANT_ClassIndex: {
1951 *bytes = JVM_CONSTANT_Class;
1952 idx1 = klass_index_at(idx);
1953 Bytes::put_Java_u2((address) (bytes+1), idx1);
1954 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1955 break;
1956 }
1957 case JVM_CONSTANT_StringIndex: {
1958 *bytes = JVM_CONSTANT_String;
1959 idx1 = string_index_at(idx);
1960 Bytes::put_Java_u2((address) (bytes+1), idx1);
1961 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1962 break;
1963 }
1964 case JVM_CONSTANT_MethodHandle:
1965 case JVM_CONSTANT_MethodHandleInError: {
1966 *bytes = JVM_CONSTANT_MethodHandle;
1967 int kind = method_handle_ref_kind_at(idx);
1968 idx1 = method_handle_index_at(idx);
1969 *(bytes+1) = (unsigned char) kind;
1970 Bytes::put_Java_u2((address) (bytes+2), idx1);
1971 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1972 break;
1973 }
1974 case JVM_CONSTANT_MethodType:
1975 case JVM_CONSTANT_MethodTypeInError: {
1976 *bytes = JVM_CONSTANT_MethodType;
1977 idx1 = method_type_index_at(idx);
1978 Bytes::put_Java_u2((address) (bytes+1), idx1);
1979 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1980 break;
1981 }
1982 case JVM_CONSTANT_InvokeDynamic: {
1983 *bytes = tag;
1984 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1985 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1986 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1987 Bytes::put_Java_u2((address) (bytes+1), idx1);
1988 Bytes::put_Java_u2((address) (bytes+3), idx2);
1989 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1990 break;
1991 }
1992 }
1993 DBG(printf("\n"));
1994 bytes += ent_size;
1995 size += ent_size;
1996 }
1997 assert(size == cpool_size, "Size mismatch");
1998
1999 // Keep temorarily for debugging until it's stable.
2000 DBG(print_cpool_bytes(cnt, start_bytes));
2001 return (int)(bytes - start_bytes);
2002 } /* end copy_cpool_bytes */
2003
2004 #undef DBG
2005
2006
2007 void ConstantPool::set_on_stack(const bool value) {
2008 if (value) {
2009 // Only record if it's not already set.
2010 if (!on_stack()) {
2011 assert(!is_shared(), "should always be set for shared constant pools");
2012 _flags |= _on_stack;
2013 MetadataOnStackMark::record(this);
2014 }
2015 } else {
2016 // Clearing is done single-threadedly.
2017 if (!is_shared()) {
2018 _flags &= ~_on_stack;
2019 }
2020 }
2021 }
2022
2023 // JSR 292 support for patching constant pool oops after the class is linked and
2024 // the oop array for resolved references are created.
2025 // We can't do this during classfile parsing, which is how the other indexes are
2026 // patched. The other patches are applied early for some error checking
2027 // so only defer the pseudo_strings.
2028 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
2029 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
2030 Handle patch = cp_patches->at(index);
2031 if (patch.not_null()) {
2032 assert (tag_at(index).is_string(), "should only be string left");
2033 // Patching a string means pre-resolving it.
2034 // The spelling in the constant pool is ignored.
2035 // The constant reference may be any object whatever.
2036 // If it is not a real interned string, the constant is referred
2037 // to as a "pseudo-string", and must be presented to the CP
2038 // explicitly, because it may require scavenging.
2039 int obj_index = cp_to_object_index(index);
2040 pseudo_string_at_put(index, obj_index, patch());
2041 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
2042 }
2043 }
2044 #ifdef ASSERT
2045 // Ensure that all the patches have been used.
2046 for (int index = 0; index < cp_patches->length(); index++) {
2047 assert(cp_patches->at(index).is_null(),
2048 "Unused constant pool patch at %d in class file %s",
2049 index,
2050 pool_holder()->external_name());
2051 }
2052 #endif // ASSERT
2053 }
2054
2055 #ifndef PRODUCT
2056
2057 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
2058 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
2059 guarantee(obj->is_constantPool(), "object must be constant pool");
2060 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
2061 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
2062
2063 for (int i = 0; i< cp->length(); i++) {
2064 if (cp->tag_at(i).is_unresolved_klass()) {
2065 // This will force loading of the class
2066 Klass* klass = cp->klass_at(i, CHECK);
2067 if (klass->is_instance_klass()) {
2068 // Force initialization of class
2069 InstanceKlass::cast(klass)->initialize(CHECK);
2070 }
2071 }
2072 }
2073 }
2074
2075 #endif
2076
2077
2078 // Printing
2079
2080 void ConstantPool::print_on(outputStream* st) const {
2081 assert(is_constantPool(), "must be constantPool");
2082 st->print_cr("%s", internal_name());
2083 if (flags() != 0) {
2084 st->print(" - flags: 0x%x", flags());
2085 if (has_preresolution()) st->print(" has_preresolution");
2086 if (on_stack()) st->print(" on_stack");
2087 st->cr();
2088 }
2089 if (pool_holder() != NULL) {
2090 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
2091 }
2092 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
2093 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
2094 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
2095 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
2096
2097 for (int index = 1; index < length(); index++) { // Index 0 is unused
2098 ((ConstantPool*)this)->print_entry_on(index, st);
2099 switch (tag_at(index).value()) {
2100 case JVM_CONSTANT_Long :
2101 case JVM_CONSTANT_Double :
2102 index++; // Skip entry following eigth-byte constant
2103 }
2104
2105 }
2106 st->cr();
2107 }
2108
2109 // Print one constant pool entry
2110 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2111 EXCEPTION_MARK;
2112 st->print(" - %3d : ", index);
2113 tag_at(index).print_on(st);
2114 st->print(" : ");
2115 switch (tag_at(index).value()) {
2116 case JVM_CONSTANT_Class :
2117 { Klass* k = klass_at(index, CATCH);
2118 guarantee(k != NULL, "need klass");
2119 k->print_value_on(st);
2120 st->print(" {" PTR_FORMAT "}", p2i(k));
2121 }
2122 break;
2123 case JVM_CONSTANT_Fieldref :
2124 case JVM_CONSTANT_Methodref :
2125 case JVM_CONSTANT_InterfaceMethodref :
2126 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2127 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2128 break;
2129 case JVM_CONSTANT_String :
2130 if (is_pseudo_string_at(index)) {
2131 oop anObj = pseudo_string_at(index);
2132 anObj->print_value_on(st);
2133 st->print(" {" PTR_FORMAT "}", p2i(anObj));
2134 } else {
2135 unresolved_string_at(index)->print_value_on(st);
2136 }
2137 break;
2138 case JVM_CONSTANT_Integer :
2139 st->print("%d", int_at(index));
2140 break;
2141 case JVM_CONSTANT_Float :
2142 st->print("%f", float_at(index));
2143 break;
2144 case JVM_CONSTANT_Long :
2145 st->print_jlong(long_at(index));
2146 break;
2147 case JVM_CONSTANT_Double :
2148 st->print("%lf", double_at(index));
2149 break;
2150 case JVM_CONSTANT_NameAndType :
2151 st->print("name_index=%d", name_ref_index_at(index));
2152 st->print(" signature_index=%d", signature_ref_index_at(index));
2153 break;
2154 case JVM_CONSTANT_Utf8 :
2155 symbol_at(index)->print_value_on(st);
2156 break;
2157 case JVM_CONSTANT_ClassIndex: {
2158 int name_index = *int_at_addr(index);
2159 st->print("klass_index=%d ", name_index);
2160 symbol_at(name_index)->print_value_on(st);
2161 }
2162 break;
2163 case JVM_CONSTANT_UnresolvedClass : // fall-through
2164 case JVM_CONSTANT_UnresolvedClassInError: {
2165 CPKlassSlot kslot = klass_slot_at(index);
2166 int resolved_klass_index = kslot.resolved_klass_index();
2167 int name_index = kslot.name_index();
2168 assert(tag_at(name_index).is_symbol(), "sanity");
2169
2170 Klass* klass = resolved_klasses()->at(resolved_klass_index);
2171 if (klass != NULL) {
2172 klass->print_value_on(st);
2173 } else {
2174 symbol_at(name_index)->print_value_on(st);
2175 }
2176 }
2177 break;
2178 case JVM_CONSTANT_MethodHandle :
2179 case JVM_CONSTANT_MethodHandleInError :
2180 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2181 st->print(" ref_index=%d", method_handle_index_at(index));
2182 break;
2183 case JVM_CONSTANT_MethodType :
2184 case JVM_CONSTANT_MethodTypeInError :
2185 st->print("signature_index=%d", method_type_index_at(index));
2186 break;
2187 case JVM_CONSTANT_InvokeDynamic :
2188 {
2189 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
2190 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
2191 int argc = invoke_dynamic_argument_count_at(index);
2192 if (argc > 0) {
2193 for (int arg_i = 0; arg_i < argc; arg_i++) {
2194 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2195 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2196 }
2197 st->print("}");
2198 }
2199 }
2200 break;
2201 default:
2202 ShouldNotReachHere();
2203 break;
2204 }
2205 st->cr();
2206 }
2207
2208 void ConstantPool::print_value_on(outputStream* st) const {
2209 assert(is_constantPool(), "must be constantPool");
2210 st->print("constant pool [%d]", length());
2211 if (has_preresolution()) st->print("/preresolution");
2212 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2213 print_address_on(st);
2214 st->print(" for ");
2215 pool_holder()->print_value_on(st);
2216 if (pool_holder() != NULL) {
2217 bool extra = (pool_holder()->constants() != this);
2218 if (extra) st->print(" (extra)");
2219 }
2220 if (cache() != NULL) {
2221 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2222 }
2223 }
2224
2225 #if INCLUDE_SERVICES
2226 // Size Statistics
2227 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2228 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2229 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2230 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2231 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2232 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2233
2234 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2235 sz->_cp_refmap_bytes;
2236 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2237 }
2238 #endif // INCLUDE_SERVICES
2239
2240 // Verification
2241
2242 void ConstantPool::verify_on(outputStream* st) {
2243 guarantee(is_constantPool(), "object must be constant pool");
2244 for (int i = 0; i< length(); i++) {
2245 constantTag tag = tag_at(i);
2246 if (tag.is_klass() || tag.is_unresolved_klass()) {
2247 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2248 } else if (tag.is_symbol()) {
2249 CPSlot entry = slot_at(i);
2250 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2251 } else if (tag.is_string()) {
2252 CPSlot entry = slot_at(i);
2253 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2254 }
2255 }
2256 if (cache() != NULL) {
2257 // Note: cache() can be NULL before a class is completely setup or
2258 // in temporary constant pools used during constant pool merging
2259 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2260 }
2261 if (pool_holder() != NULL) {
2262 // Note: pool_holder() can be NULL in temporary constant pools
2263 // used during constant pool merging
2264 guarantee(pool_holder()->is_klass(), "should be klass");
2265 }
2266 }
2267
2268
2269 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2270 char *str = sym->as_utf8();
2271 unsigned int hash = compute_hash(str, sym->utf8_length());
2272 unsigned int index = hash % table_size();
2273
2274 // check if already in map
2275 // we prefer the first entry since it is more likely to be what was used in
2276 // the class file
2277 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2278 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2279 if (en->hash() == hash && en->symbol() == sym) {
2280 return; // already there
2281 }
2282 }
2283
2284 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2285 entry->set_next(bucket(index));
2286 _buckets[index].set_entry(entry);
2287 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2288 }
2289
2290 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2291 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2292 char *str = sym->as_utf8();
2293 int len = sym->utf8_length();
2294 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2295 unsigned int index = hash % table_size();
2296 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2297 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2298 if (en->hash() == hash && en->symbol() == sym) {
2299 return en;
2300 }
2301 }
2302 return NULL;
2303 }
2304
2305 void SymbolHashMap::initialize_table(int table_size) {
2306 _table_size = table_size;
2307 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
2308 for (int index = 0; index < table_size; index++) {
2309 _buckets[index].clear();
2310 }
2311 }