1 /*
2 * Copyright (c) 1997, 2018, 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/array.inline.hpp"
42 #include "oops/constantPool.inline.hpp"
43 #include "oops/cpCache.inline.hpp"
44 #include "oops/instanceKlass.hpp"
45 #include "oops/objArrayKlass.hpp"
46 #include "oops/objArrayOop.inline.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "oops/typeArrayOop.inline.hpp"
49 #include "runtime/fieldType.hpp"
50 #include "runtime/init.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/signature.hpp"
53 #include "runtime/vframe.hpp"
54 #include "utilities/copy.hpp"
55
56 constantTag ConstantPool::tag_at(int which) const { return (constantTag)tags()->at_acquire(which); }
57
58 void ConstantPool::release_tag_at_put(int which, jbyte t) { tags()->release_at_put(which, t); }
59
60 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
61 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
62 int size = ConstantPool::size(length);
63 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
64 }
65
66 #ifdef ASSERT
67
68 // MetaspaceObj allocation invariant is calloc equivalent memory
69 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
70 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
71 assert(tags != NULL, "invariant");
72 const int length = tags->length();
73 for (int index = 0; index < length; ++index) {
74 if (JVM_CONSTANT_Invalid != tags->at(index)) {
75 return false;
76 }
77 }
78 return true;
79 }
80
81 #endif
82
83 ConstantPool::ConstantPool(Array<u1>* tags) :
84 _tags(tags),
85 _length(tags->length()) {
86
87 assert(_tags != NULL, "invariant");
88 assert(tags->length() == _length, "invariant");
89 assert(tag_array_is_zero_initialized(tags), "invariant");
90 assert(0 == flags(), "invariant");
91 assert(0 == version(), "invariant");
92 assert(NULL == _pool_holder, "invariant");
93 }
94
95 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
96 if (cache() != NULL) {
97 MetadataFactory::free_metadata(loader_data, cache());
98 set_cache(NULL);
99 }
100
101 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
102 set_resolved_klasses(NULL);
103
104 MetadataFactory::free_array<jushort>(loader_data, operands());
105 set_operands(NULL);
106
107 release_C_heap_structures();
108
109 // free tag array
110 MetadataFactory::free_array<u1>(loader_data, tags());
111 set_tags(NULL);
112 }
113
114 void ConstantPool::release_C_heap_structures() {
115 // walk constant pool and decrement symbol reference counts
116 unreference_symbols();
117 }
118
119 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
120 log_trace(cds)("Iter(ConstantPool): %p", this);
121
122 it->push(&_tags, MetaspaceClosure::_writable);
123 it->push(&_cache);
124 it->push(&_pool_holder);
125 it->push(&_operands);
126 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
127
128 for (int i = 0; i < length(); i++) {
129 // The only MSO's embedded in the CP entries are Symbols:
130 // JVM_CONSTANT_String (normal and pseudo)
131 // JVM_CONSTANT_Utf8
132 constantTag ctag = tag_at(i);
133 if (ctag.is_string() || ctag.is_utf8()) {
134 it->push(symbol_at_addr(i));
135 }
136 }
137 }
138
139 objArrayOop ConstantPool::resolved_references() const {
140 return (objArrayOop)_cache->resolved_references();
141 }
142
143 // Called from outside constant pool resolution where a resolved_reference array
144 // may not be present.
145 objArrayOop ConstantPool::resolved_references_or_null() const {
146 if (_cache == NULL) {
147 return NULL;
148 } else {
149 return (objArrayOop)_cache->resolved_references();
150 }
151 }
152
153 // Create resolved_references array and mapping array for original cp indexes
154 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
155 // to map it back for resolving and some unlikely miscellaneous uses.
156 // The objects created by invokedynamic are appended to this list.
157 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
158 const intStack& reference_map,
159 int constant_pool_map_length,
160 TRAPS) {
161 // Initialized the resolved object cache.
162 int map_length = reference_map.length();
163 if (map_length > 0) {
164 // Only need mapping back to constant pool entries. The map isn't used for
165 // invokedynamic resolved_reference entries. For invokedynamic entries,
166 // the constant pool cache index has the mapping back to both the constant
167 // pool and to the resolved reference index.
168 if (constant_pool_map_length > 0) {
169 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
170
171 for (int i = 0; i < constant_pool_map_length; i++) {
172 int x = reference_map.at(i);
173 assert(x == (int)(jushort) x, "klass index is too big");
174 om->at_put(i, (jushort)x);
175 }
176 set_reference_map(om);
177 }
178
179 // Create Java array for holding resolved strings, methodHandles,
180 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
181 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
182 Handle refs_handle (THREAD, (oop)stom); // must handleize.
183 set_resolved_references(loader_data->add_handle(refs_handle));
184 }
185 }
186
187 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
188 // A ConstantPool can't possibly have 0xffff valid class entries,
189 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
190 // entry for the class's name. So at most we will have 0xfffe class entries.
191 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
192 // UnresolvedKlass entries that are temporarily created during class redefinition.
193 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
194 assert(resolved_klasses() == NULL, "sanity");
195 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
196 set_resolved_klasses(rk);
197 }
198
199 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
200 int len = length();
201 int num_klasses = 0;
202 for (int i = 1; i <len; i++) {
203 switch (tag_at(i).value()) {
204 case JVM_CONSTANT_ClassIndex:
205 {
206 const int class_index = klass_index_at(i);
207 unresolved_klass_at_put(i, class_index, num_klasses++);
208 }
209 break;
210 #ifndef PRODUCT
211 case JVM_CONSTANT_Class:
212 case JVM_CONSTANT_UnresolvedClass:
213 case JVM_CONSTANT_UnresolvedClassInError:
214 // All of these should have been reverted back to ClassIndex before calling
215 // this function.
216 ShouldNotReachHere();
217 #endif
218 }
219 }
220 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
221 }
222
223 // Anonymous class support:
224 void ConstantPool::klass_at_put(int class_index, int name_index, int resolved_klass_index, Klass* k, Symbol* name) {
225 assert(is_within_bounds(class_index), "index out of bounds");
226 assert(is_within_bounds(name_index), "index out of bounds");
227 assert((resolved_klass_index & 0xffff0000) == 0, "must be");
228 *int_at_addr(class_index) =
229 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index);
230
231 symbol_at_put(name_index, name);
232 name->increment_refcount();
233 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
234 OrderAccess::release_store(adr, k);
235
236 // The interpreter assumes when the tag is stored, the klass is resolved
237 // and the Klass* non-NULL, so we need hardware store ordering here.
238 if (k != NULL) {
239 release_tag_at_put(class_index, JVM_CONSTANT_Class);
240 } else {
241 release_tag_at_put(class_index, JVM_CONSTANT_UnresolvedClass);
242 }
243 }
244
245 // Anonymous class support:
246 void ConstantPool::klass_at_put(int class_index, Klass* k) {
247 assert(k != NULL, "must be valid klass");
248 CPKlassSlot kslot = klass_slot_at(class_index);
249 int resolved_klass_index = kslot.resolved_klass_index();
250 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
251 OrderAccess::release_store(adr, k);
252
253 // The interpreter assumes when the tag is stored, the klass is resolved
254 // and the Klass* non-NULL, so we need hardware store ordering here.
255 release_tag_at_put(class_index, JVM_CONSTANT_Class);
256 }
257
258 #if INCLUDE_CDS_JAVA_HEAP
259 // Archive the resolved references
260 void ConstantPool::archive_resolved_references(Thread* THREAD) {
261 if (_cache == NULL) {
262 return; // nothing to do
263 }
264
265 InstanceKlass *ik = pool_holder();
266 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() ||
267 ik->is_shared_app_class())) {
268 // Archiving resolved references for classes from non-builtin loaders
269 // is not yet supported.
270 set_resolved_references(NULL);
271 return;
272 }
273
274 objArrayOop rr = resolved_references();
275 Array<u2>* ref_map = reference_map();
276 if (rr != NULL) {
277 int ref_map_len = ref_map == NULL ? 0 : ref_map->length();
278 int rr_len = rr->length();
279 for (int i = 0; i < rr_len; i++) {
280 oop p = rr->obj_at(i);
281 rr->obj_at_put(i, NULL);
282 if (p != NULL && i < ref_map_len) {
283 int index = object_to_cp_index(i);
284 // Skip the entry if the string hash code is 0 since the string
285 // is not included in the shared string_table, see StringTable::copy_shared_string.
286 if (tag_at(index).is_string() && java_lang_String::hash_code(p) != 0) {
287 oop op = StringTable::create_archived_string(p, THREAD);
288 // If the String object is not archived (possibly too large),
289 // NULL is returned. Also set it in the array, so we won't
290 // have a 'bad' reference in the archived resolved_reference
291 // array.
292 rr->obj_at_put(i, op);
293 }
294 }
295 }
296
297 oop archived = MetaspaceShared::archive_heap_object(rr, THREAD);
298 _cache->set_archived_references(archived);
299 set_resolved_references(NULL);
300 }
301 }
302
303 void ConstantPool::resolve_class_constants(TRAPS) {
304 assert(DumpSharedSpaces, "used during dump time only");
305 // The _cache may be NULL if the _pool_holder klass fails verification
306 // at dump time due to missing dependencies.
307 if (cache() == NULL || reference_map() == NULL) {
308 return; // nothing to do
309 }
310
311 constantPoolHandle cp(THREAD, this);
312 for (int index = 1; index < length(); index++) { // Index 0 is unused
313 if (tag_at(index).is_string() && !cp->is_pseudo_string_at(index)) {
314 int cache_index = cp->cp_to_object_index(index);
315 string_at_impl(cp, index, cache_index, CHECK);
316 }
317 }
318 }
319 #endif
320
321 // CDS support. Create a new resolved_references array.
322 void ConstantPool::restore_unshareable_info(TRAPS) {
323 assert(is_constantPool(), "ensure C++ vtable is restored");
324 assert(on_stack(), "should always be set for shared constant pools");
325 assert(is_shared(), "should always be set for shared constant pools");
326 assert(_cache != NULL, "constant pool _cache should not be NULL");
327
328 // Only create the new resolved references array if it hasn't been attempted before
329 if (resolved_references() != NULL) return;
330
331 // restore the C++ vtable from the shared archive
332 restore_vtable();
333
334 if (SystemDictionary::Object_klass_loaded()) {
335 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
336 #if INCLUDE_CDS_JAVA_HEAP
337 if (MetaspaceShared::open_archive_heap_region_mapped() &&
338 _cache->archived_references() != NULL) {
339 oop archived = _cache->archived_references();
340 // Create handle for the archived resolved reference array object
341 Handle refs_handle(THREAD, archived);
342 set_resolved_references(loader_data->add_handle(refs_handle));
343 } else
344 #endif
345 {
346 // No mapped archived resolved reference array
347 // Recreate the object array and add to ClassLoaderData.
348 int map_length = resolved_reference_length();
349 if (map_length > 0) {
350 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
351 Handle refs_handle(THREAD, (oop)stom); // must handleize.
352 set_resolved_references(loader_data->add_handle(refs_handle));
353 }
354 }
355 }
356 }
357
358 void ConstantPool::remove_unshareable_info() {
359 // Resolved references are not in the shared archive.
360 // Save the length for restoration. It is not necessarily the same length
361 // as reference_map.length() if invokedynamic is saved. It is needed when
362 // re-creating the resolved reference array if archived heap data cannot be map
363 // at runtime.
364 set_resolved_reference_length(
365 resolved_references() != NULL ? resolved_references()->length() : 0);
366
367 // If archiving heap objects is not allowed, clear the resolved references.
368 // Otherwise, it is cleared after the resolved references array is cached
369 // (see archive_resolved_references()).
370 if (!MetaspaceShared::is_heap_object_archiving_allowed()) {
371 set_resolved_references(NULL);
372 }
373
374 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
375 // The _on_stack flag is used to prevent ConstantPools from deallocation during
376 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
377 // we always set _on_stack to true to avoid having to change _flags during runtime.
378 _flags |= (_on_stack | _is_shared);
379 int num_klasses = 0;
380 for (int index = 1; index < length(); index++) { // Index 0 is unused
381 assert(!tag_at(index).is_unresolved_klass_in_error(), "This must not happen during dump time");
382 if (tag_at(index).is_klass()) {
383 // This class was resolved as a side effect of executing Java code
384 // during dump time. We need to restore it back to an UnresolvedClass,
385 // so that the proper class loading and initialization can happen
386 // at runtime.
387 CPKlassSlot kslot = klass_slot_at(index);
388 int resolved_klass_index = kslot.resolved_klass_index();
389 int name_index = kslot.name_index();
390 assert(tag_at(name_index).is_symbol(), "sanity");
391 resolved_klasses()->at_put(resolved_klass_index, NULL);
392 tag_at_put(index, JVM_CONSTANT_UnresolvedClass);
393 assert(klass_name_at(index) == symbol_at(name_index), "sanity");
394 }
395 }
396 if (cache() != NULL) {
397 cache()->remove_unshareable_info();
398 }
399 }
400
401 int ConstantPool::cp_to_object_index(int cp_index) {
402 // this is harder don't do this so much.
403 int i = reference_map()->find(cp_index);
404 // We might not find the index for jsr292 call.
405 return (i < 0) ? _no_index_sentinel : i;
406 }
407
408 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
409 resolved_references()->obj_at_put(obj_index, str);
410 }
411
412 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
413 ResourceMark rm;
414 int line_number = -1;
415 const char * source_file = NULL;
416 if (JavaThread::current()->has_last_Java_frame()) {
417 // try to identify the method which called this function.
418 vframeStream vfst(JavaThread::current());
419 if (!vfst.at_end()) {
420 line_number = vfst.method()->line_number_from_bci(vfst.bci());
421 Symbol* s = vfst.method()->method_holder()->source_file_name();
422 if (s != NULL) {
423 source_file = s->as_C_string();
424 }
425 }
426 }
427 if (k != this_cp->pool_holder()) {
428 // only print something if the classes are different
429 if (source_file != NULL) {
430 log_debug(class, resolve)("%s %s %s:%d",
431 this_cp->pool_holder()->external_name(),
432 k->external_name(), source_file, line_number);
433 } else {
434 log_debug(class, resolve)("%s %s",
435 this_cp->pool_holder()->external_name(),
436 k->external_name());
437 }
438 }
439 }
440
441 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
442 bool save_resolution_error, TRAPS) {
443 assert(THREAD->is_Java_thread(), "must be a Java thread");
444
445 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
446 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
447 // the entry and tag is not updated atomicly.
448 CPKlassSlot kslot = this_cp->klass_slot_at(which);
449 int resolved_klass_index = kslot.resolved_klass_index();
450 int name_index = kslot.name_index();
451 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
452
453 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
454 if (klass != NULL) {
455 return klass;
456 }
457
458 // This tag doesn't change back to unresolved class unless at a safepoint.
459 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
460 // The original attempt to resolve this constant pool entry failed so find the
461 // class of the original error and throw another error of the same class
462 // (JVMS 5.4.3).
463 // If there is a detail message, pass that detail message to the error.
464 // The JVMS does not strictly require us to duplicate the same detail message,
465 // or any internal exception fields such as cause or stacktrace. But since the
466 // detail message is often a class name or other literal string, we will repeat it
467 // if we can find it in the symbol table.
468 throw_resolution_error(this_cp, which, CHECK_0);
469 ShouldNotReachHere();
470 }
471
472 Handle mirror_handle;
473 Symbol* name = this_cp->symbol_at(name_index);
474 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
475 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
476 Klass* k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
477 if (!HAS_PENDING_EXCEPTION) {
478 // preserve the resolved klass from unloading
479 mirror_handle = Handle(THREAD, k->java_mirror());
480 // Do access check for klasses
481 verify_constant_pool_resolve(this_cp, k, THREAD);
482 }
483
484 // Failed to resolve class. We must record the errors so that subsequent attempts
485 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
486 if (HAS_PENDING_EXCEPTION) {
487 if (save_resolution_error) {
488 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
489 // If CHECK_NULL above doesn't return the exception, that means that
490 // some other thread has beaten us and has resolved the class.
491 // To preserve old behavior, we return the resolved class.
492 klass = this_cp->resolved_klasses()->at(resolved_klass_index);
493 assert(klass != NULL, "must be resolved if exception was cleared");
494 return klass;
495 } else {
496 return NULL; // return the pending exception
497 }
498 }
499
500 // Make this class loader depend upon the class loader owning the class reference
501 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
502 this_key->record_dependency(k, CHECK_NULL); // Can throw OOM
503
504 // logging for class+resolve.
505 if (log_is_enabled(Debug, class, resolve)){
506 trace_class_resolution(this_cp, k);
507 }
508 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
509 OrderAccess::release_store(adr, k);
510 // The interpreter assumes when the tag is stored, the klass is resolved
511 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
512 // hardware store ordering here.
513 this_cp->release_tag_at_put(which, JVM_CONSTANT_Class);
514 return k;
515 }
516
517
518 // Does not update ConstantPool* - to avoid any exception throwing. Used
519 // by compiler and exception handling. Also used to avoid classloads for
520 // instanceof operations. Returns NULL if the class has not been loaded or
521 // if the verification of constant pool failed
522 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
523 CPKlassSlot kslot = this_cp->klass_slot_at(which);
524 int resolved_klass_index = kslot.resolved_klass_index();
525 int name_index = kslot.name_index();
526 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
527
528 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
529 if (k != NULL) {
530 return k;
531 } else {
532 Thread *thread = Thread::current();
533 Symbol* name = this_cp->symbol_at(name_index);
534 oop loader = this_cp->pool_holder()->class_loader();
535 oop protection_domain = this_cp->pool_holder()->protection_domain();
536 Handle h_prot (thread, protection_domain);
537 Handle h_loader (thread, loader);
538 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
539
540 if (k != NULL) {
541 // Make sure that resolving is legal
542 EXCEPTION_MARK;
543 // return NULL if verification fails
544 verify_constant_pool_resolve(this_cp, k, THREAD);
545 if (HAS_PENDING_EXCEPTION) {
546 CLEAR_PENDING_EXCEPTION;
547 return NULL;
548 }
549 return k;
550 } else {
551 return k;
552 }
553 }
554 }
555
556 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
557 int which) {
558 if (cpool->cache() == NULL) return NULL; // nothing to load yet
559 int cache_index = decode_cpcache_index(which, true);
560 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
561 // FIXME: should be an assert
562 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
563 return NULL;
564 }
565 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
566 return e->method_if_resolved(cpool);
567 }
568
569
570 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
571 if (cpool->cache() == NULL) return false; // nothing to load yet
572 int cache_index = decode_cpcache_index(which, true);
573 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
574 return e->has_appendix();
575 }
576
577 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
578 if (cpool->cache() == NULL) return NULL; // 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->appendix_if_resolved(cpool);
582 }
583
584
585 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
586 if (cpool->cache() == NULL) return false; // nothing to load yet
587 int cache_index = decode_cpcache_index(which, true);
588 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
589 return e->has_method_type();
590 }
591
592 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
593 if (cpool->cache() == NULL) return NULL; // 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->method_type_if_resolved(cpool);
597 }
598
599
600 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
601 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
602 return symbol_at(name_index);
603 }
604
605
606 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
607 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
608 return symbol_at(signature_index);
609 }
610
611 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
612 int i = which;
613 if (!uncached && cache() != NULL) {
614 if (ConstantPool::is_invokedynamic_index(which)) {
615 // Invokedynamic index is index into the constant pool cache
616 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
617 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
618 assert(tag_at(pool_index).is_name_and_type(), "");
619 return pool_index;
620 }
621 // change byte-ordering and go via cache
622 i = remap_instruction_operand_from_cache(which);
623 } else {
624 if (tag_at(which).is_invoke_dynamic() ||
625 tag_at(which).is_dynamic_constant() ||
626 tag_at(which).is_dynamic_constant_in_error()) {
627 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
628 assert(tag_at(pool_index).is_name_and_type(), "");
629 return pool_index;
630 }
631 }
632 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
633 assert(!tag_at(i).is_invoke_dynamic() &&
634 !tag_at(i).is_dynamic_constant() &&
635 !tag_at(i).is_dynamic_constant_in_error(), "Must be handled above");
636 jint ref_index = *int_at_addr(i);
637 return extract_high_short_from_int(ref_index);
638 }
639
640 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
641 int pool_index = which;
642 if (!uncached && cache() != NULL) {
643 if (ConstantPool::is_invokedynamic_index(which)) {
644 // Invokedynamic index is index into resolved_references
645 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
646 } else {
647 // change byte-ordering and go via cache
648 pool_index = remap_instruction_operand_from_cache(which);
649 }
650 }
651 return tag_at(pool_index);
652 }
653
654 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
655 guarantee(!ConstantPool::is_invokedynamic_index(which),
656 "an invokedynamic instruction does not have a klass");
657 int i = which;
658 if (!uncached && cache() != NULL) {
659 // change byte-ordering and go via cache
660 i = remap_instruction_operand_from_cache(which);
661 }
662 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
663 jint ref_index = *int_at_addr(i);
664 return extract_low_short_from_int(ref_index);
665 }
666
667
668
669 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
670 int cpc_index = operand;
671 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
672 assert((int)(u2)cpc_index == cpc_index, "clean u2");
673 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
674 return member_index;
675 }
676
677
678 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
679 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
680 return; // short cut, typeArray klass is always accessible
681 }
682 Klass* holder = this_cp->pool_holder();
683 bool fold_type_to_class = true;
684 LinkResolver::check_klass_accessability(holder, k, fold_type_to_class, CHECK);
685 }
686
687
688 int ConstantPool::name_ref_index_at(int which_nt) {
689 jint ref_index = name_and_type_at(which_nt);
690 return extract_low_short_from_int(ref_index);
691 }
692
693
694 int ConstantPool::signature_ref_index_at(int which_nt) {
695 jint ref_index = name_and_type_at(which_nt);
696 return extract_high_short_from_int(ref_index);
697 }
698
699
700 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
701 return klass_at(klass_ref_index_at(which), THREAD);
702 }
703
704 Symbol* ConstantPool::klass_name_at(int which) const {
705 return symbol_at(klass_slot_at(which).name_index());
706 }
707
708 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
709 jint ref_index = klass_ref_index_at(which);
710 return klass_at_noresolve(ref_index);
711 }
712
713 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
714 jint ref_index = uncached_klass_ref_index_at(which);
715 return klass_at_noresolve(ref_index);
716 }
717
718 char* ConstantPool::string_at_noresolve(int which) {
719 return unresolved_string_at(which)->as_C_string();
720 }
721
722 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
723 return FieldType::basic_type(symbol_at(which));
724 }
725
726
727 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
728 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
729 if (this_cp->tag_at(index).is_string()) {
730 this_cp->string_at(index, CHECK);
731 }
732 }
733 }
734
735 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
736 // Dig out the detailed message to reuse if possible
737 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
738 if (message != NULL) {
739 return message;
740 }
741
742 // Return specific message for the tag
743 switch (tag.value()) {
744 case JVM_CONSTANT_UnresolvedClass:
745 // return the class name in the error message
746 message = this_cp->klass_name_at(which);
747 break;
748 case JVM_CONSTANT_MethodHandle:
749 // return the method handle name in the error message
750 message = this_cp->method_handle_name_ref_at(which);
751 break;
752 case JVM_CONSTANT_MethodType:
753 // return the method type signature in the error message
754 message = this_cp->method_type_signature_at(which);
755 break;
756 default:
757 ShouldNotReachHere();
758 }
759
760 return message;
761 }
762
763 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
764 Symbol* message = NULL;
765 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
766 assert(error != NULL && message != NULL, "checking");
767 CLEAR_PENDING_EXCEPTION;
768 ResourceMark rm;
769 THROW_MSG(error, message->as_C_string());
770 }
771
772 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
773 // exception in the resolution error table, so that the same exception is thrown again.
774 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
775 constantTag tag, TRAPS) {
776 Symbol* error = PENDING_EXCEPTION->klass()->name();
777
778 int error_tag = tag.error_value();
779
780 if (!PENDING_EXCEPTION->
781 is_a(SystemDictionary::LinkageError_klass())) {
782 // Just throw the exception and don't prevent these classes from
783 // being loaded due to virtual machine errors like StackOverflow
784 // and OutOfMemoryError, etc, or if the thread was hit by stop()
785 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
786 } else if (this_cp->tag_at(which).value() != error_tag) {
787 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
788 SystemDictionary::add_resolution_error(this_cp, which, error, message);
789 // CAS in the tag. If a thread beat us to registering this error that's fine.
790 // If another thread resolved the reference, this is a race condition. This
791 // thread may have had a security manager or something temporary.
792 // This doesn't deterministically get an error. So why do we save this?
793 // We save this because jvmti can add classes to the bootclass path after
794 // this error, so it needs to get the same error if the error is first.
795 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
796 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
797 if (old_tag != error_tag && old_tag != tag.value()) {
798 // MethodHandles and MethodType doesn't change to resolved version.
799 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
800 // Forget the exception and use the resolved class.
801 CLEAR_PENDING_EXCEPTION;
802 }
803 } else {
804 // some other thread put this in error state
805 throw_resolution_error(this_cp, which, CHECK);
806 }
807 }
808
809 BasicType ConstantPool::basic_type_for_constant_at(int which) {
810 constantTag tag = tag_at(which);
811 if (tag.is_dynamic_constant() ||
812 tag.is_dynamic_constant_in_error()) {
813 // have to look at the signature for this one
814 Symbol* constant_type = uncached_signature_ref_at(which);
815 return FieldType::basic_type(constant_type);
816 }
817 return tag.basic_type();
818 }
819
820 // Called to resolve constants in the constant pool and return an oop.
821 // Some constant pool entries cache their resolved oop. This is also
822 // called to create oops from constants to use in arguments for invokedynamic
823 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
824 int index, int cache_index,
825 bool* status_return, TRAPS) {
826 oop result_oop = NULL;
827 Handle throw_exception;
828
829 if (cache_index == _possible_index_sentinel) {
830 // It is possible that this constant is one which is cached in the objects.
831 // We'll do a linear search. This should be OK because this usage is rare.
832 // FIXME: If bootstrap specifiers stress this code, consider putting in
833 // a reverse index. Binary search over a short array should do it.
834 assert(index > 0, "valid index");
835 cache_index = this_cp->cp_to_object_index(index);
836 }
837 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
838 assert(index == _no_index_sentinel || index >= 0, "");
839
840 if (cache_index >= 0) {
841 result_oop = this_cp->resolved_references()->obj_at(cache_index);
842 if (result_oop != NULL) {
843 if (result_oop == Universe::the_null_sentinel()) {
844 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index)));
845 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
846 result_oop = NULL;
847 }
848 if (status_return != NULL) (*status_return) = true;
849 return result_oop;
850 // That was easy...
851 }
852 index = this_cp->object_to_cp_index(cache_index);
853 }
854
855 jvalue prim_value; // temp used only in a few cases below
856
857 constantTag tag = this_cp->tag_at(index);
858
859 if (status_return != NULL) {
860 // don't trigger resolution if the constant might need it
861 switch (tag.value()) {
862 case JVM_CONSTANT_Class:
863 {
864 CPKlassSlot kslot = this_cp->klass_slot_at(index);
865 int resolved_klass_index = kslot.resolved_klass_index();
866 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) {
867 (*status_return) = false;
868 return NULL;
869 }
870 // the klass is waiting in the CP; go get it
871 break;
872 }
873 case JVM_CONSTANT_String:
874 case JVM_CONSTANT_Integer:
875 case JVM_CONSTANT_Float:
876 case JVM_CONSTANT_Long:
877 case JVM_CONSTANT_Double:
878 // these guys trigger OOM at worst
879 break;
880 default:
881 (*status_return) = false;
882 return NULL;
883 }
884 // from now on there is either success or an OOME
885 (*status_return) = true;
886 }
887
888 switch (tag.value()) {
889
890 case JVM_CONSTANT_UnresolvedClass:
891 case JVM_CONSTANT_UnresolvedClassInError:
892 case JVM_CONSTANT_Class:
893 {
894 assert(cache_index == _no_index_sentinel, "should not have been set");
895 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
896 // ldc wants the java mirror.
897 result_oop = resolved->java_mirror();
898 break;
899 }
900
901 case JVM_CONSTANT_Dynamic:
902 {
903 Klass* current_klass = this_cp->pool_holder();
904 Symbol* constant_name = this_cp->uncached_name_ref_at(index);
905 Symbol* constant_type = this_cp->uncached_signature_ref_at(index);
906
907 // The initial step in resolving an unresolved symbolic reference to a
908 // dynamically-computed constant is to resolve the symbolic reference to a
909 // method handle which will be the bootstrap method for the dynamically-computed
910 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
911 // method fails, then a MethodHandleInError is stored at the corresponding
912 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
913 // set a DynamicConstantInError here since any subsequent use of this
914 // bootstrap method will encounter the resolution of MethodHandleInError.
915 oop bsm_info = this_cp->resolve_bootstrap_specifier_at(index, THREAD);
916 Exceptions::wrap_dynamic_exception(CHECK_NULL);
917 assert(bsm_info != NULL, "");
918 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_Dynamic.
919 Handle bootstrap_specifier = Handle(THREAD, bsm_info);
920
921 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
922 Handle value = SystemDictionary::link_dynamic_constant(current_klass,
923 index,
924 bootstrap_specifier,
925 constant_name,
926 constant_type,
927 THREAD);
928 result_oop = value();
929 Exceptions::wrap_dynamic_exception(THREAD);
930 if (HAS_PENDING_EXCEPTION) {
931 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
932 // will check for a LinkageError and store a DynamicConstantInError.
933 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
934 }
935 BasicType type = FieldType::basic_type(constant_type);
936 if (!is_reference_type(type)) {
937 // Make sure the primitive value is properly boxed.
938 // This is a JDK responsibility.
939 const char* fail = NULL;
940 if (result_oop == NULL) {
941 fail = "null result instead of box";
942 } else if (!is_java_primitive(type)) {
943 // FIXME: support value types via unboxing
944 fail = "can only handle references and primitives";
945 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
946 fail = "primitive is not properly boxed";
947 }
948 if (fail != NULL) {
949 // Since this exception is not a LinkageError, throw exception
950 // but do not save a DynamicInError resolution result.
951 // See section 5.4.3 of the VM spec.
952 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
953 }
954 }
955 break;
956 }
957
958 case JVM_CONSTANT_String:
959 assert(cache_index != _no_index_sentinel, "should have been set");
960 if (this_cp->is_pseudo_string_at(index)) {
961 result_oop = this_cp->pseudo_string_at(index, cache_index);
962 break;
963 }
964 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
965 break;
966
967 case JVM_CONSTANT_DynamicInError:
968 case JVM_CONSTANT_MethodHandleInError:
969 case JVM_CONSTANT_MethodTypeInError:
970 {
971 throw_resolution_error(this_cp, index, CHECK_NULL);
972 break;
973 }
974
975 case JVM_CONSTANT_MethodHandle:
976 {
977 int ref_kind = this_cp->method_handle_ref_kind_at(index);
978 int callee_index = this_cp->method_handle_klass_index_at(index);
979 Symbol* name = this_cp->method_handle_name_ref_at(index);
980 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
981 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
982 { ResourceMark rm(THREAD);
983 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
984 ref_kind, index, this_cp->method_handle_index_at(index),
985 callee_index, name->as_C_string(), signature->as_C_string());
986 }
987
988 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
989
990 // Check constant pool method consistency
991 if ((callee->is_interface() && m_tag.is_method()) ||
992 ((!callee->is_interface() && m_tag.is_interface_method()))) {
993 ResourceMark rm(THREAD);
994 char buf[400];
995 jio_snprintf(buf, sizeof(buf),
996 "Inconsistent constant pool data in classfile for class %s. "
997 "Method %s%s at index %d is %s and should be %s",
998 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index,
999 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1000 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1001 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
1002 }
1003
1004 Klass* klass = this_cp->pool_holder();
1005 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1006 callee, name, signature,
1007 THREAD);
1008 result_oop = value();
1009 if (HAS_PENDING_EXCEPTION) {
1010 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1011 }
1012 break;
1013 }
1014
1015 case JVM_CONSTANT_MethodType:
1016 {
1017 Symbol* signature = this_cp->method_type_signature_at(index);
1018 { ResourceMark rm(THREAD);
1019 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1020 index, this_cp->method_type_index_at(index),
1021 signature->as_C_string());
1022 }
1023 Klass* klass = this_cp->pool_holder();
1024 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1025 result_oop = value();
1026 if (HAS_PENDING_EXCEPTION) {
1027 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1028 }
1029 break;
1030 }
1031
1032 case JVM_CONSTANT_Integer:
1033 assert(cache_index == _no_index_sentinel, "should not have been set");
1034 prim_value.i = this_cp->int_at(index);
1035 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1036 break;
1037
1038 case JVM_CONSTANT_Float:
1039 assert(cache_index == _no_index_sentinel, "should not have been set");
1040 prim_value.f = this_cp->float_at(index);
1041 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1042 break;
1043
1044 case JVM_CONSTANT_Long:
1045 assert(cache_index == _no_index_sentinel, "should not have been set");
1046 prim_value.j = this_cp->long_at(index);
1047 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1048 break;
1049
1050 case JVM_CONSTANT_Double:
1051 assert(cache_index == _no_index_sentinel, "should not have been set");
1052 prim_value.d = this_cp->double_at(index);
1053 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1054 break;
1055
1056 default:
1057 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
1058 this_cp(), index, cache_index, tag.value()));
1059 assert(false, "unexpected constant tag");
1060 break;
1061 }
1062
1063 if (cache_index >= 0) {
1064 // Benign race condition: resolved_references may already be filled in.
1065 // The important thing here is that all threads pick up the same result.
1066 // It doesn't matter which racing thread wins, as long as only one
1067 // result is used by all threads, and all future queries.
1068 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop);
1069 oop old_result = this_cp->resolved_references()
1070 ->atomic_compare_exchange_oop(cache_index, new_result, NULL);
1071 if (old_result == NULL) {
1072 return result_oop; // was installed
1073 } else {
1074 // Return the winning thread's result. This can be different than
1075 // the result here for MethodHandles.
1076 if (old_result == Universe::the_null_sentinel())
1077 old_result = NULL;
1078 return old_result;
1079 }
1080 } else {
1081 assert(result_oop != Universe::the_null_sentinel(), "");
1082 return result_oop;
1083 }
1084 }
1085
1086 oop ConstantPool::uncached_string_at(int which, TRAPS) {
1087 Symbol* sym = unresolved_string_at(which);
1088 oop str = StringTable::intern(sym, CHECK_(NULL));
1089 assert(java_lang_String::is_instance(str), "must be string");
1090 return str;
1091 }
1092
1093
1094 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) {
1095 assert((this_cp->tag_at(index).is_invoke_dynamic() ||
1096 this_cp->tag_at(index).is_dynamic_constant()), "Corrupted constant pool");
1097 Handle bsm;
1098 int argc;
1099 {
1100 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&mtype], plus optional arguments
1101 // JVM_CONSTANT_Dynamic is an ordered pair of [bootm, name&ftype], plus optional arguments
1102 // In both cases, the bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
1103 // It is accompanied by the optional arguments.
1104 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
1105 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
1106 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
1107 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
1108 }
1109
1110 // Extract the optional static arguments.
1111 argc = this_cp->invoke_dynamic_argument_count_at(index);
1112
1113 // if there are no static arguments, return the bsm by itself:
1114 if (argc == 0 && UseBootstrapCallInfo < 2) return bsm_oop;
1115
1116 bsm = Handle(THREAD, bsm_oop);
1117 }
1118
1119 // We are going to return an ordered pair of {bsm, info}, using a 2-array.
1120 objArrayHandle info;
1121 {
1122 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1123 info = objArrayHandle(THREAD, info_oop);
1124 }
1125
1126 info->obj_at_put(0, bsm());
1127
1128 bool use_BSCI;
1129 switch (UseBootstrapCallInfo) {
1130 default: use_BSCI = true; break; // stress mode
1131 case 0: use_BSCI = false; break; // stress mode
1132 case 1: // normal mode
1133 // If we were to support an alternative mode of BSM invocation,
1134 // we'd convert to pull mode here if the BSM could be a candidate
1135 // for that alternative mode. We can't easily test for things
1136 // like varargs here, but we can get away with approximate testing,
1137 // since the JDK runtime will make up the difference either way.
1138 // For now, exercise the pull-mode path if the BSM is of arity 2,
1139 // or if there is a potential condy loop (see below).
1140 oop mt_oop = java_lang_invoke_MethodHandle::type(bsm());
1141 use_BSCI = (java_lang_invoke_MethodType::ptype_count(mt_oop) == 2);
1142 break;
1143 }
1144
1145 // Here's a reason to use BSCI even if it wasn't requested:
1146 // If a condy uses a condy argument, we want to avoid infinite
1147 // recursion (condy loops) in the C code. It's OK in Java,
1148 // because Java has stack overflow checking, so we punt
1149 // potentially cyclic cases from C to Java.
1150 if (!use_BSCI && this_cp->tag_at(index).is_dynamic_constant()) {
1151 bool found_unresolved_condy = false;
1152 for (int i = 0; i < argc; i++) {
1153 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
1154 if (this_cp->tag_at(arg_index).is_dynamic_constant()) {
1155 // potential recursion point condy -> condy
1156 bool found_it = false;
1157 this_cp->find_cached_constant_at(arg_index, found_it, CHECK_NULL);
1158 if (!found_it) { found_unresolved_condy = true; break; }
1159 }
1160 }
1161 if (found_unresolved_condy)
1162 use_BSCI = true;
1163 }
1164
1165 const int SMALL_ARITY = 5;
1166 if (use_BSCI && argc <= SMALL_ARITY && UseBootstrapCallInfo <= 2) {
1167 // If there are only a few arguments, and none of them need linking,
1168 // push them, instead of asking the JDK runtime to turn around and
1169 // pull them, saving a JVM/JDK transition in some simple cases.
1170 bool all_resolved = true;
1171 for (int i = 0; i < argc; i++) {
1172 bool found_it = false;
1173 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
1174 this_cp->find_cached_constant_at(arg_index, found_it, CHECK_NULL);
1175 if (!found_it) { all_resolved = false; break; }
1176 }
1177 if (all_resolved)
1178 use_BSCI = false;
1179 }
1180
1181 if (!use_BSCI) {
1182 // return {bsm, {arg...}}; resolution of arguments is done immediately, before JDK code is called
1183 objArrayOop args_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), argc, CHECK_NULL);
1184 info->obj_at_put(1, args_oop); // may overwrite with args[0] below
1185 objArrayHandle args(THREAD, args_oop);
1186 copy_bootstrap_arguments_at_impl(this_cp, index, 0, argc, args, 0, true, Handle(), CHECK_NULL);
1187 if (argc == 1) {
1188 // try to discard the singleton array
1189 oop arg_oop = args->obj_at(0);
1190 if (arg_oop != NULL && !arg_oop->is_array()) {
1191 // JVM treats arrays and nulls specially in this position,
1192 // but other things are just single arguments
1193 info->obj_at_put(1, arg_oop);
1194 }
1195 }
1196 } else {
1197 // return {bsm, {arg_count, pool_index}}; JDK code must pull the arguments as needed
1198 typeArrayOop ints_oop = oopFactory::new_typeArray(T_INT, 2, CHECK_NULL);
1199 ints_oop->int_at_put(0, argc);
1200 ints_oop->int_at_put(1, index);
1201 info->obj_at_put(1, ints_oop);
1202 }
1203 return info();
1204 }
1205
1206 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index,
1207 int start_arg, int end_arg,
1208 objArrayHandle info, int pos,
1209 bool must_resolve, Handle if_not_available,
1210 TRAPS) {
1211 int argc;
1212 int limit = pos + end_arg - start_arg;
1213 // checks: index in range [0..this_cp->length),
1214 // tag at index, start..end in range [0..argc],
1215 // info array non-null, pos..limit in [0..info.length]
1216 if ((0 >= index || index >= this_cp->length()) ||
1217 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1218 this_cp->tag_at(index).is_dynamic_constant()) ||
1219 (0 > start_arg || start_arg > end_arg) ||
1220 (end_arg > (argc = this_cp->invoke_dynamic_argument_count_at(index))) ||
1221 (0 > pos || pos > limit) ||
1222 (info.is_null() || limit > info->length())) {
1223 // An index or something else went wrong; throw an error.
1224 // Since this is an internal API, we don't expect this,
1225 // so we don't bother to craft a nice message.
1226 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1227 }
1228 // now we can loop safely
1229 int info_i = pos;
1230 for (int i = start_arg; i < end_arg; i++) {
1231 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
1232 oop arg_oop;
1233 if (must_resolve) {
1234 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1235 } else {
1236 bool found_it = false;
1237 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1238 if (!found_it) arg_oop = if_not_available();
1239 }
1240 info->obj_at_put(info_i++, arg_oop);
1241 }
1242 }
1243
1244 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1245 // If the string has already been interned, this entry will be non-null
1246 oop str = this_cp->resolved_references()->obj_at(obj_index);
1247 assert(str != Universe::the_null_sentinel(), "");
1248 if (str != NULL) return str;
1249 Symbol* sym = this_cp->unresolved_string_at(which);
1250 str = StringTable::intern(sym, CHECK_(NULL));
1251 this_cp->string_at_put(which, obj_index, str);
1252 assert(java_lang_String::is_instance(str), "must be string");
1253 return str;
1254 }
1255
1256
1257 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1258 // Names are interned, so we can compare Symbol*s directly
1259 Symbol* cp_name = klass_name_at(which);
1260 return (cp_name == k->name());
1261 }
1262
1263
1264 // Iterate over symbols and decrement ones which are Symbol*s
1265 // This is done during GC.
1266 // Only decrement the UTF8 symbols. Strings point to
1267 // these symbols but didn't increment the reference count.
1268 void ConstantPool::unreference_symbols() {
1269 for (int index = 1; index < length(); index++) { // Index 0 is unused
1270 constantTag tag = tag_at(index);
1271 if (tag.is_symbol()) {
1272 symbol_at(index)->decrement_refcount();
1273 }
1274 }
1275 }
1276
1277
1278 // Compare this constant pool's entry at index1 to the constant pool
1279 // cp2's entry at index2.
1280 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1281 int index2, TRAPS) {
1282
1283 // The error tags are equivalent to non-error tags when comparing
1284 jbyte t1 = tag_at(index1).non_error_value();
1285 jbyte t2 = cp2->tag_at(index2).non_error_value();
1286
1287 if (t1 != t2) {
1288 // Not the same entry type so there is nothing else to check. Note
1289 // that this style of checking will consider resolved/unresolved
1290 // class pairs as different.
1291 // From the ConstantPool* API point of view, this is correct
1292 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1293 // plays out in the context of ConstantPool* merging.
1294 return false;
1295 }
1296
1297 switch (t1) {
1298 case JVM_CONSTANT_Class:
1299 {
1300 Klass* k1 = klass_at(index1, CHECK_false);
1301 Klass* k2 = cp2->klass_at(index2, CHECK_false);
1302 if (k1 == k2) {
1303 return true;
1304 }
1305 } break;
1306
1307 case JVM_CONSTANT_ClassIndex:
1308 {
1309 int recur1 = klass_index_at(index1);
1310 int recur2 = cp2->klass_index_at(index2);
1311 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1312 if (match) {
1313 return true;
1314 }
1315 } break;
1316
1317 case JVM_CONSTANT_Double:
1318 {
1319 jdouble d1 = double_at(index1);
1320 jdouble d2 = cp2->double_at(index2);
1321 if (d1 == d2) {
1322 return true;
1323 }
1324 } break;
1325
1326 case JVM_CONSTANT_Fieldref:
1327 case JVM_CONSTANT_InterfaceMethodref:
1328 case JVM_CONSTANT_Methodref:
1329 {
1330 int recur1 = uncached_klass_ref_index_at(index1);
1331 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1332 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1333 if (match) {
1334 recur1 = uncached_name_and_type_ref_index_at(index1);
1335 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1336 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1337 if (match) {
1338 return true;
1339 }
1340 }
1341 } break;
1342
1343 case JVM_CONSTANT_Float:
1344 {
1345 jfloat f1 = float_at(index1);
1346 jfloat f2 = cp2->float_at(index2);
1347 if (f1 == f2) {
1348 return true;
1349 }
1350 } break;
1351
1352 case JVM_CONSTANT_Integer:
1353 {
1354 jint i1 = int_at(index1);
1355 jint i2 = cp2->int_at(index2);
1356 if (i1 == i2) {
1357 return true;
1358 }
1359 } break;
1360
1361 case JVM_CONSTANT_Long:
1362 {
1363 jlong l1 = long_at(index1);
1364 jlong l2 = cp2->long_at(index2);
1365 if (l1 == l2) {
1366 return true;
1367 }
1368 } break;
1369
1370 case JVM_CONSTANT_NameAndType:
1371 {
1372 int recur1 = name_ref_index_at(index1);
1373 int recur2 = cp2->name_ref_index_at(index2);
1374 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1375 if (match) {
1376 recur1 = signature_ref_index_at(index1);
1377 recur2 = cp2->signature_ref_index_at(index2);
1378 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1379 if (match) {
1380 return true;
1381 }
1382 }
1383 } break;
1384
1385 case JVM_CONSTANT_StringIndex:
1386 {
1387 int recur1 = string_index_at(index1);
1388 int recur2 = cp2->string_index_at(index2);
1389 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1390 if (match) {
1391 return true;
1392 }
1393 } break;
1394
1395 case JVM_CONSTANT_UnresolvedClass:
1396 {
1397 Symbol* k1 = klass_name_at(index1);
1398 Symbol* k2 = cp2->klass_name_at(index2);
1399 if (k1 == k2) {
1400 return true;
1401 }
1402 } break;
1403
1404 case JVM_CONSTANT_MethodType:
1405 {
1406 int k1 = method_type_index_at(index1);
1407 int k2 = cp2->method_type_index_at(index2);
1408 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1409 if (match) {
1410 return true;
1411 }
1412 } break;
1413
1414 case JVM_CONSTANT_MethodHandle:
1415 {
1416 int k1 = method_handle_ref_kind_at(index1);
1417 int k2 = cp2->method_handle_ref_kind_at(index2);
1418 if (k1 == k2) {
1419 int i1 = method_handle_index_at(index1);
1420 int i2 = cp2->method_handle_index_at(index2);
1421 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1422 if (match) {
1423 return true;
1424 }
1425 }
1426 } break;
1427
1428 case JVM_CONSTANT_Dynamic:
1429 {
1430 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1431 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1432 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1433 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1434 // separate statements and variables because CHECK_false is used
1435 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1436 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1437 return (match_entry && match_operand);
1438 } break;
1439
1440 case JVM_CONSTANT_InvokeDynamic:
1441 {
1442 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1443 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1444 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1445 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1446 // separate statements and variables because CHECK_false is used
1447 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1448 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1449 return (match_entry && match_operand);
1450 } break;
1451
1452 case JVM_CONSTANT_String:
1453 {
1454 Symbol* s1 = unresolved_string_at(index1);
1455 Symbol* s2 = cp2->unresolved_string_at(index2);
1456 if (s1 == s2) {
1457 return true;
1458 }
1459 } break;
1460
1461 case JVM_CONSTANT_Utf8:
1462 {
1463 Symbol* s1 = symbol_at(index1);
1464 Symbol* s2 = cp2->symbol_at(index2);
1465 if (s1 == s2) {
1466 return true;
1467 }
1468 } break;
1469
1470 // Invalid is used as the tag for the second constant pool entry
1471 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1472 // not be seen by itself.
1473 case JVM_CONSTANT_Invalid: // fall through
1474
1475 default:
1476 ShouldNotReachHere();
1477 break;
1478 }
1479
1480 return false;
1481 } // end compare_entry_to()
1482
1483
1484 // Resize the operands array with delta_len and delta_size.
1485 // Used in RedefineClasses for CP merge.
1486 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1487 int old_len = operand_array_length(operands());
1488 int new_len = old_len + delta_len;
1489 int min_len = (delta_len > 0) ? old_len : new_len;
1490
1491 int old_size = operands()->length();
1492 int new_size = old_size + delta_size;
1493 int min_size = (delta_size > 0) ? old_size : new_size;
1494
1495 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1496 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1497
1498 // Set index in the resized array for existing elements only
1499 for (int idx = 0; idx < min_len; idx++) {
1500 int offset = operand_offset_at(idx); // offset in original array
1501 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1502 }
1503 // Copy the bootstrap specifiers only
1504 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1505 new_ops->adr_at(2*new_len),
1506 (min_size - 2*min_len) * sizeof(u2));
1507 // Explicitly deallocate old operands array.
1508 // Note, it is not needed for 7u backport.
1509 if ( operands() != NULL) { // the safety check
1510 MetadataFactory::free_array<u2>(loader_data, operands());
1511 }
1512 set_operands(new_ops);
1513 } // end resize_operands()
1514
1515
1516 // Extend the operands array with the length and size of the ext_cp operands.
1517 // Used in RedefineClasses for CP merge.
1518 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1519 int delta_len = operand_array_length(ext_cp->operands());
1520 if (delta_len == 0) {
1521 return; // nothing to do
1522 }
1523 int delta_size = ext_cp->operands()->length();
1524
1525 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1526
1527 if (operand_array_length(operands()) == 0) {
1528 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1529 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1530 // The first element index defines the offset of second part
1531 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1532 set_operands(new_ops);
1533 } else {
1534 resize_operands(delta_len, delta_size, CHECK);
1535 }
1536
1537 } // end extend_operands()
1538
1539
1540 // Shrink the operands array to a smaller array with new_len length.
1541 // Used in RedefineClasses for CP merge.
1542 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1543 int old_len = operand_array_length(operands());
1544 if (new_len == old_len) {
1545 return; // nothing to do
1546 }
1547 assert(new_len < old_len, "shrunken operands array must be smaller");
1548
1549 int free_base = operand_next_offset_at(new_len - 1);
1550 int delta_len = new_len - old_len;
1551 int delta_size = 2*delta_len + free_base - operands()->length();
1552
1553 resize_operands(delta_len, delta_size, CHECK);
1554
1555 } // end shrink_operands()
1556
1557
1558 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1559 const constantPoolHandle& to_cp,
1560 TRAPS) {
1561
1562 int from_oplen = operand_array_length(from_cp->operands());
1563 int old_oplen = operand_array_length(to_cp->operands());
1564 if (from_oplen != 0) {
1565 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1566 // append my operands to the target's operands array
1567 if (old_oplen == 0) {
1568 // Can't just reuse from_cp's operand list because of deallocation issues
1569 int len = from_cp->operands()->length();
1570 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1571 Copy::conjoint_memory_atomic(
1572 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1573 to_cp->set_operands(new_ops);
1574 } else {
1575 int old_len = to_cp->operands()->length();
1576 int from_len = from_cp->operands()->length();
1577 int old_off = old_oplen * sizeof(u2);
1578 int from_off = from_oplen * sizeof(u2);
1579 // Use the metaspace for the destination constant pool
1580 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1581 int fillp = 0, len = 0;
1582 // first part of dest
1583 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1584 new_operands->adr_at(fillp),
1585 (len = old_off) * sizeof(u2));
1586 fillp += len;
1587 // first part of src
1588 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1589 new_operands->adr_at(fillp),
1590 (len = from_off) * sizeof(u2));
1591 fillp += len;
1592 // second part of dest
1593 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1594 new_operands->adr_at(fillp),
1595 (len = old_len - old_off) * sizeof(u2));
1596 fillp += len;
1597 // second part of src
1598 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1599 new_operands->adr_at(fillp),
1600 (len = from_len - from_off) * sizeof(u2));
1601 fillp += len;
1602 assert(fillp == new_operands->length(), "");
1603
1604 // Adjust indexes in the first part of the copied operands array.
1605 for (int j = 0; j < from_oplen; j++) {
1606 int offset = operand_offset_at(new_operands, old_oplen + j);
1607 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1608 offset += old_len; // every new tuple is preceded by old_len extra u2's
1609 operand_offset_at_put(new_operands, old_oplen + j, offset);
1610 }
1611
1612 // replace target operands array with combined array
1613 to_cp->set_operands(new_operands);
1614 }
1615 }
1616 } // end copy_operands()
1617
1618
1619 // Copy this constant pool's entries at start_i to end_i (inclusive)
1620 // to the constant pool to_cp's entries starting at to_i. A total of
1621 // (end_i - start_i) + 1 entries are copied.
1622 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1623 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1624
1625
1626 int dest_i = to_i; // leave original alone for debug purposes
1627
1628 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1629 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1630
1631 switch (from_cp->tag_at(src_i).value()) {
1632 case JVM_CONSTANT_Double:
1633 case JVM_CONSTANT_Long:
1634 // double and long take two constant pool entries
1635 src_i += 2;
1636 dest_i += 2;
1637 break;
1638
1639 default:
1640 // all others take one constant pool entry
1641 src_i++;
1642 dest_i++;
1643 break;
1644 }
1645 }
1646 copy_operands(from_cp, to_cp, CHECK);
1647
1648 } // end copy_cp_to_impl()
1649
1650
1651 // Copy this constant pool's entry at from_i to the constant pool
1652 // to_cp's entry at to_i.
1653 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1654 const constantPoolHandle& to_cp, int to_i,
1655 TRAPS) {
1656
1657 int tag = from_cp->tag_at(from_i).value();
1658 switch (tag) {
1659 case JVM_CONSTANT_ClassIndex:
1660 {
1661 jint ki = from_cp->klass_index_at(from_i);
1662 to_cp->klass_index_at_put(to_i, ki);
1663 } break;
1664
1665 case JVM_CONSTANT_Double:
1666 {
1667 jdouble d = from_cp->double_at(from_i);
1668 to_cp->double_at_put(to_i, d);
1669 // double takes two constant pool entries so init second entry's tag
1670 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1671 } break;
1672
1673 case JVM_CONSTANT_Fieldref:
1674 {
1675 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1676 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1677 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1678 } break;
1679
1680 case JVM_CONSTANT_Float:
1681 {
1682 jfloat f = from_cp->float_at(from_i);
1683 to_cp->float_at_put(to_i, f);
1684 } break;
1685
1686 case JVM_CONSTANT_Integer:
1687 {
1688 jint i = from_cp->int_at(from_i);
1689 to_cp->int_at_put(to_i, i);
1690 } break;
1691
1692 case JVM_CONSTANT_InterfaceMethodref:
1693 {
1694 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1695 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1696 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1697 } break;
1698
1699 case JVM_CONSTANT_Long:
1700 {
1701 jlong l = from_cp->long_at(from_i);
1702 to_cp->long_at_put(to_i, l);
1703 // long takes two constant pool entries so init second entry's tag
1704 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1705 } break;
1706
1707 case JVM_CONSTANT_Methodref:
1708 {
1709 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1710 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1711 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1712 } break;
1713
1714 case JVM_CONSTANT_NameAndType:
1715 {
1716 int name_ref_index = from_cp->name_ref_index_at(from_i);
1717 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1718 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1719 } break;
1720
1721 case JVM_CONSTANT_StringIndex:
1722 {
1723 jint si = from_cp->string_index_at(from_i);
1724 to_cp->string_index_at_put(to_i, si);
1725 } break;
1726
1727 case JVM_CONSTANT_Class:
1728 case JVM_CONSTANT_UnresolvedClass:
1729 case JVM_CONSTANT_UnresolvedClassInError:
1730 {
1731 // Revert to JVM_CONSTANT_ClassIndex
1732 int name_index = from_cp->klass_slot_at(from_i).name_index();
1733 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1734 to_cp->klass_index_at_put(to_i, name_index);
1735 } break;
1736
1737 case JVM_CONSTANT_String:
1738 {
1739 Symbol* s = from_cp->unresolved_string_at(from_i);
1740 to_cp->unresolved_string_at_put(to_i, s);
1741 } break;
1742
1743 case JVM_CONSTANT_Utf8:
1744 {
1745 Symbol* s = from_cp->symbol_at(from_i);
1746 // Need to increase refcount, the old one will be thrown away and deferenced
1747 s->increment_refcount();
1748 to_cp->symbol_at_put(to_i, s);
1749 } break;
1750
1751 case JVM_CONSTANT_MethodType:
1752 case JVM_CONSTANT_MethodTypeInError:
1753 {
1754 jint k = from_cp->method_type_index_at(from_i);
1755 to_cp->method_type_index_at_put(to_i, k);
1756 } break;
1757
1758 case JVM_CONSTANT_MethodHandle:
1759 case JVM_CONSTANT_MethodHandleInError:
1760 {
1761 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1762 int k2 = from_cp->method_handle_index_at(from_i);
1763 to_cp->method_handle_index_at_put(to_i, k1, k2);
1764 } break;
1765
1766 case JVM_CONSTANT_Dynamic:
1767 case JVM_CONSTANT_DynamicInError:
1768 {
1769 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1770 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1771 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1772 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1773 } break;
1774
1775 case JVM_CONSTANT_InvokeDynamic:
1776 {
1777 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1778 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1779 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1780 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1781 } break;
1782
1783 // Invalid is used as the tag for the second constant pool entry
1784 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1785 // not be seen by itself.
1786 case JVM_CONSTANT_Invalid: // fall through
1787
1788 default:
1789 {
1790 ShouldNotReachHere();
1791 } break;
1792 }
1793 } // end copy_entry_to()
1794
1795 // Search constant pool search_cp for an entry that matches this
1796 // constant pool's entry at pattern_i. Returns the index of a
1797 // matching entry or zero (0) if there is no matching entry.
1798 int ConstantPool::find_matching_entry(int pattern_i,
1799 const constantPoolHandle& search_cp, TRAPS) {
1800
1801 // index zero (0) is not used
1802 for (int i = 1; i < search_cp->length(); i++) {
1803 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1804 if (found) {
1805 return i;
1806 }
1807 }
1808
1809 return 0; // entry not found; return unused index zero (0)
1810 } // end find_matching_entry()
1811
1812
1813 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1814 // cp2's bootstrap specifier at idx2.
1815 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1816 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1817 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1818 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1819
1820 if (!match) {
1821 return false;
1822 }
1823 int argc = operand_argument_count_at(idx1);
1824 if (argc == cp2->operand_argument_count_at(idx2)) {
1825 for (int j = 0; j < argc; j++) {
1826 k1 = operand_argument_index_at(idx1, j);
1827 k2 = cp2->operand_argument_index_at(idx2, j);
1828 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1829 if (!match) {
1830 return false;
1831 }
1832 }
1833 return true; // got through loop; all elements equal
1834 }
1835 return false;
1836 } // end compare_operand_to()
1837
1838 // Search constant pool search_cp for a bootstrap specifier that matches
1839 // this constant pool's bootstrap specifier at pattern_i index.
1840 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1841 int ConstantPool::find_matching_operand(int pattern_i,
1842 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1843 for (int i = 0; i < search_len; i++) {
1844 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1845 if (found) {
1846 return i;
1847 }
1848 }
1849 return -1; // bootstrap specifier not found; return unused index (-1)
1850 } // end find_matching_operand()
1851
1852
1853 #ifndef PRODUCT
1854
1855 const char* ConstantPool::printable_name_at(int which) {
1856
1857 constantTag tag = tag_at(which);
1858
1859 if (tag.is_string()) {
1860 return string_at_noresolve(which);
1861 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1862 return klass_name_at(which)->as_C_string();
1863 } else if (tag.is_symbol()) {
1864 return symbol_at(which)->as_C_string();
1865 }
1866 return "";
1867 }
1868
1869 #endif // PRODUCT
1870
1871
1872 // JVMTI GetConstantPool support
1873
1874 // For debugging of constant pool
1875 const bool debug_cpool = false;
1876
1877 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1878
1879 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1880 const char* WARN_MSG = "Must not be such entry!";
1881 jint size = 0;
1882 u2 idx1, idx2;
1883
1884 for (jint idx = 1; idx < cnt; idx++) {
1885 jint ent_size = 0;
1886 u1 tag = *bytes++;
1887 size++; // count tag
1888
1889 printf("const #%03d, tag: %02d ", idx, tag);
1890 switch(tag) {
1891 case JVM_CONSTANT_Invalid: {
1892 printf("Invalid");
1893 break;
1894 }
1895 case JVM_CONSTANT_Unicode: {
1896 printf("Unicode %s", WARN_MSG);
1897 break;
1898 }
1899 case JVM_CONSTANT_Utf8: {
1900 u2 len = Bytes::get_Java_u2(bytes);
1901 char str[128];
1902 if (len > 127) {
1903 len = 127;
1904 }
1905 strncpy(str, (char *) (bytes+2), len);
1906 str[len] = '\0';
1907 printf("Utf8 \"%s\"", str);
1908 ent_size = 2 + len;
1909 break;
1910 }
1911 case JVM_CONSTANT_Integer: {
1912 u4 val = Bytes::get_Java_u4(bytes);
1913 printf("int %d", *(int *) &val);
1914 ent_size = 4;
1915 break;
1916 }
1917 case JVM_CONSTANT_Float: {
1918 u4 val = Bytes::get_Java_u4(bytes);
1919 printf("float %5.3ff", *(float *) &val);
1920 ent_size = 4;
1921 break;
1922 }
1923 case JVM_CONSTANT_Long: {
1924 u8 val = Bytes::get_Java_u8(bytes);
1925 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1926 ent_size = 8;
1927 idx++; // Long takes two cpool slots
1928 break;
1929 }
1930 case JVM_CONSTANT_Double: {
1931 u8 val = Bytes::get_Java_u8(bytes);
1932 printf("double %5.3fd", *(jdouble *)&val);
1933 ent_size = 8;
1934 idx++; // Double takes two cpool slots
1935 break;
1936 }
1937 case JVM_CONSTANT_Class: {
1938 idx1 = Bytes::get_Java_u2(bytes);
1939 printf("class #%03d", idx1);
1940 ent_size = 2;
1941 break;
1942 }
1943 case JVM_CONSTANT_String: {
1944 idx1 = Bytes::get_Java_u2(bytes);
1945 printf("String #%03d", idx1);
1946 ent_size = 2;
1947 break;
1948 }
1949 case JVM_CONSTANT_Fieldref: {
1950 idx1 = Bytes::get_Java_u2(bytes);
1951 idx2 = Bytes::get_Java_u2(bytes+2);
1952 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1953 ent_size = 4;
1954 break;
1955 }
1956 case JVM_CONSTANT_Methodref: {
1957 idx1 = Bytes::get_Java_u2(bytes);
1958 idx2 = Bytes::get_Java_u2(bytes+2);
1959 printf("Method #%03d, #%03d", idx1, idx2);
1960 ent_size = 4;
1961 break;
1962 }
1963 case JVM_CONSTANT_InterfaceMethodref: {
1964 idx1 = Bytes::get_Java_u2(bytes);
1965 idx2 = Bytes::get_Java_u2(bytes+2);
1966 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1967 ent_size = 4;
1968 break;
1969 }
1970 case JVM_CONSTANT_NameAndType: {
1971 idx1 = Bytes::get_Java_u2(bytes);
1972 idx2 = Bytes::get_Java_u2(bytes+2);
1973 printf("NameAndType #%03d, #%03d", idx1, idx2);
1974 ent_size = 4;
1975 break;
1976 }
1977 case JVM_CONSTANT_ClassIndex: {
1978 printf("ClassIndex %s", WARN_MSG);
1979 break;
1980 }
1981 case JVM_CONSTANT_UnresolvedClass: {
1982 printf("UnresolvedClass: %s", WARN_MSG);
1983 break;
1984 }
1985 case JVM_CONSTANT_UnresolvedClassInError: {
1986 printf("UnresolvedClassInErr: %s", WARN_MSG);
1987 break;
1988 }
1989 case JVM_CONSTANT_StringIndex: {
1990 printf("StringIndex: %s", WARN_MSG);
1991 break;
1992 }
1993 }
1994 printf(";\n");
1995 bytes += ent_size;
1996 size += ent_size;
1997 }
1998 printf("Cpool size: %d\n", size);
1999 fflush(0);
2000 return;
2001 } /* end print_cpool_bytes */
2002
2003
2004 // Returns size of constant pool entry.
2005 jint ConstantPool::cpool_entry_size(jint idx) {
2006 switch(tag_at(idx).value()) {
2007 case JVM_CONSTANT_Invalid:
2008 case JVM_CONSTANT_Unicode:
2009 return 1;
2010
2011 case JVM_CONSTANT_Utf8:
2012 return 3 + symbol_at(idx)->utf8_length();
2013
2014 case JVM_CONSTANT_Class:
2015 case JVM_CONSTANT_String:
2016 case JVM_CONSTANT_ClassIndex:
2017 case JVM_CONSTANT_UnresolvedClass:
2018 case JVM_CONSTANT_UnresolvedClassInError:
2019 case JVM_CONSTANT_StringIndex:
2020 case JVM_CONSTANT_MethodType:
2021 case JVM_CONSTANT_MethodTypeInError:
2022 return 3;
2023
2024 case JVM_CONSTANT_MethodHandle:
2025 case JVM_CONSTANT_MethodHandleInError:
2026 return 4; //tag, ref_kind, ref_index
2027
2028 case JVM_CONSTANT_Integer:
2029 case JVM_CONSTANT_Float:
2030 case JVM_CONSTANT_Fieldref:
2031 case JVM_CONSTANT_Methodref:
2032 case JVM_CONSTANT_InterfaceMethodref:
2033 case JVM_CONSTANT_NameAndType:
2034 return 5;
2035
2036 case JVM_CONSTANT_Dynamic:
2037 case JVM_CONSTANT_DynamicInError:
2038 case JVM_CONSTANT_InvokeDynamic:
2039 // u1 tag, u2 bsm, u2 nt
2040 return 5;
2041
2042 case JVM_CONSTANT_Long:
2043 case JVM_CONSTANT_Double:
2044 return 9;
2045 }
2046 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
2047 return 1;
2048 } /* end cpool_entry_size */
2049
2050
2051 // SymbolHashMap is used to find a constant pool index from a string.
2052 // This function fills in SymbolHashMaps, one for utf8s and one for
2053 // class names, returns size of the cpool raw bytes.
2054 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
2055 SymbolHashMap *classmap) {
2056 jint size = 0;
2057
2058 for (u2 idx = 1; idx < length(); idx++) {
2059 u2 tag = tag_at(idx).value();
2060 size += cpool_entry_size(idx);
2061
2062 switch(tag) {
2063 case JVM_CONSTANT_Utf8: {
2064 Symbol* sym = symbol_at(idx);
2065 symmap->add_entry(sym, idx);
2066 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
2067 break;
2068 }
2069 case JVM_CONSTANT_Class:
2070 case JVM_CONSTANT_UnresolvedClass:
2071 case JVM_CONSTANT_UnresolvedClassInError: {
2072 Symbol* sym = klass_name_at(idx);
2073 classmap->add_entry(sym, idx);
2074 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
2075 break;
2076 }
2077 case JVM_CONSTANT_Long:
2078 case JVM_CONSTANT_Double: {
2079 idx++; // Both Long and Double take two cpool slots
2080 break;
2081 }
2082 }
2083 }
2084 return size;
2085 } /* end hash_utf8_entries_to */
2086
2087
2088 // Copy cpool bytes.
2089 // Returns:
2090 // 0, in case of OutOfMemoryError
2091 // -1, in case of internal error
2092 // > 0, count of the raw cpool bytes that have been copied
2093 int ConstantPool::copy_cpool_bytes(int cpool_size,
2094 SymbolHashMap* tbl,
2095 unsigned char *bytes) {
2096 u2 idx1, idx2;
2097 jint size = 0;
2098 jint cnt = length();
2099 unsigned char *start_bytes = bytes;
2100
2101 for (jint idx = 1; idx < cnt; idx++) {
2102 u1 tag = tag_at(idx).value();
2103 jint ent_size = cpool_entry_size(idx);
2104
2105 assert(size + ent_size <= cpool_size, "Size mismatch");
2106
2107 *bytes = tag;
2108 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2109 switch(tag) {
2110 case JVM_CONSTANT_Invalid: {
2111 DBG(printf("JVM_CONSTANT_Invalid"));
2112 break;
2113 }
2114 case JVM_CONSTANT_Unicode: {
2115 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2116 DBG(printf("JVM_CONSTANT_Unicode"));
2117 break;
2118 }
2119 case JVM_CONSTANT_Utf8: {
2120 Symbol* sym = symbol_at(idx);
2121 char* str = sym->as_utf8();
2122 // Warning! It's crashing on x86 with len = sym->utf8_length()
2123 int len = (int) strlen(str);
2124 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2125 for (int i = 0; i < len; i++) {
2126 bytes[3+i] = (u1) str[i];
2127 }
2128 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2129 break;
2130 }
2131 case JVM_CONSTANT_Integer: {
2132 jint val = int_at(idx);
2133 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2134 break;
2135 }
2136 case JVM_CONSTANT_Float: {
2137 jfloat val = float_at(idx);
2138 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2139 break;
2140 }
2141 case JVM_CONSTANT_Long: {
2142 jlong val = long_at(idx);
2143 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2144 idx++; // Long takes two cpool slots
2145 break;
2146 }
2147 case JVM_CONSTANT_Double: {
2148 jdouble val = double_at(idx);
2149 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2150 idx++; // Double takes two cpool slots
2151 break;
2152 }
2153 case JVM_CONSTANT_Class:
2154 case JVM_CONSTANT_UnresolvedClass:
2155 case JVM_CONSTANT_UnresolvedClassInError: {
2156 *bytes = JVM_CONSTANT_Class;
2157 Symbol* sym = klass_name_at(idx);
2158 idx1 = tbl->symbol_to_value(sym);
2159 assert(idx1 != 0, "Have not found a hashtable entry");
2160 Bytes::put_Java_u2((address) (bytes+1), idx1);
2161 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2162 break;
2163 }
2164 case JVM_CONSTANT_String: {
2165 *bytes = JVM_CONSTANT_String;
2166 Symbol* sym = unresolved_string_at(idx);
2167 idx1 = tbl->symbol_to_value(sym);
2168 assert(idx1 != 0, "Have not found a hashtable entry");
2169 Bytes::put_Java_u2((address) (bytes+1), idx1);
2170 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2171 break;
2172 }
2173 case JVM_CONSTANT_Fieldref:
2174 case JVM_CONSTANT_Methodref:
2175 case JVM_CONSTANT_InterfaceMethodref: {
2176 idx1 = uncached_klass_ref_index_at(idx);
2177 idx2 = uncached_name_and_type_ref_index_at(idx);
2178 Bytes::put_Java_u2((address) (bytes+1), idx1);
2179 Bytes::put_Java_u2((address) (bytes+3), idx2);
2180 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2181 break;
2182 }
2183 case JVM_CONSTANT_NameAndType: {
2184 idx1 = name_ref_index_at(idx);
2185 idx2 = signature_ref_index_at(idx);
2186 Bytes::put_Java_u2((address) (bytes+1), idx1);
2187 Bytes::put_Java_u2((address) (bytes+3), idx2);
2188 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2189 break;
2190 }
2191 case JVM_CONSTANT_ClassIndex: {
2192 *bytes = JVM_CONSTANT_Class;
2193 idx1 = klass_index_at(idx);
2194 Bytes::put_Java_u2((address) (bytes+1), idx1);
2195 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2196 break;
2197 }
2198 case JVM_CONSTANT_StringIndex: {
2199 *bytes = JVM_CONSTANT_String;
2200 idx1 = string_index_at(idx);
2201 Bytes::put_Java_u2((address) (bytes+1), idx1);
2202 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2203 break;
2204 }
2205 case JVM_CONSTANT_MethodHandle:
2206 case JVM_CONSTANT_MethodHandleInError: {
2207 *bytes = JVM_CONSTANT_MethodHandle;
2208 int kind = method_handle_ref_kind_at(idx);
2209 idx1 = method_handle_index_at(idx);
2210 *(bytes+1) = (unsigned char) kind;
2211 Bytes::put_Java_u2((address) (bytes+2), idx1);
2212 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2213 break;
2214 }
2215 case JVM_CONSTANT_MethodType:
2216 case JVM_CONSTANT_MethodTypeInError: {
2217 *bytes = JVM_CONSTANT_MethodType;
2218 idx1 = method_type_index_at(idx);
2219 Bytes::put_Java_u2((address) (bytes+1), idx1);
2220 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2221 break;
2222 }
2223 case JVM_CONSTANT_Dynamic:
2224 case JVM_CONSTANT_DynamicInError: {
2225 *bytes = tag;
2226 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2227 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2228 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
2229 Bytes::put_Java_u2((address) (bytes+1), idx1);
2230 Bytes::put_Java_u2((address) (bytes+3), idx2);
2231 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2232 break;
2233 }
2234 case JVM_CONSTANT_InvokeDynamic: {
2235 *bytes = tag;
2236 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2237 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2238 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
2239 Bytes::put_Java_u2((address) (bytes+1), idx1);
2240 Bytes::put_Java_u2((address) (bytes+3), idx2);
2241 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2242 break;
2243 }
2244 }
2245 DBG(printf("\n"));
2246 bytes += ent_size;
2247 size += ent_size;
2248 }
2249 assert(size == cpool_size, "Size mismatch");
2250
2251 // Keep temorarily for debugging until it's stable.
2252 DBG(print_cpool_bytes(cnt, start_bytes));
2253 return (int)(bytes - start_bytes);
2254 } /* end copy_cpool_bytes */
2255
2256 #undef DBG
2257
2258
2259 void ConstantPool::set_on_stack(const bool value) {
2260 if (value) {
2261 // Only record if it's not already set.
2262 if (!on_stack()) {
2263 assert(!is_shared(), "should always be set for shared constant pools");
2264 _flags |= _on_stack;
2265 MetadataOnStackMark::record(this);
2266 }
2267 } else {
2268 // Clearing is done single-threadedly.
2269 if (!is_shared()) {
2270 _flags &= ~_on_stack;
2271 }
2272 }
2273 }
2274
2275 // JSR 292 support for patching constant pool oops after the class is linked and
2276 // the oop array for resolved references are created.
2277 // We can't do this during classfile parsing, which is how the other indexes are
2278 // patched. The other patches are applied early for some error checking
2279 // so only defer the pseudo_strings.
2280 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
2281 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
2282 Handle patch = cp_patches->at(index);
2283 if (patch.not_null()) {
2284 assert (tag_at(index).is_string(), "should only be string left");
2285 // Patching a string means pre-resolving it.
2286 // The spelling in the constant pool is ignored.
2287 // The constant reference may be any object whatever.
2288 // If it is not a real interned string, the constant is referred
2289 // to as a "pseudo-string", and must be presented to the CP
2290 // explicitly, because it may require scavenging.
2291 int obj_index = cp_to_object_index(index);
2292 pseudo_string_at_put(index, obj_index, patch());
2293 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
2294 }
2295 }
2296 #ifdef ASSERT
2297 // Ensure that all the patches have been used.
2298 for (int index = 0; index < cp_patches->length(); index++) {
2299 assert(cp_patches->at(index).is_null(),
2300 "Unused constant pool patch at %d in class file %s",
2301 index,
2302 pool_holder()->external_name());
2303 }
2304 #endif // ASSERT
2305 }
2306
2307 #ifndef PRODUCT
2308
2309 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
2310 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
2311 guarantee(obj->is_constantPool(), "object must be constant pool");
2312 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
2313 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
2314
2315 for (int i = 0; i< cp->length(); i++) {
2316 if (cp->tag_at(i).is_unresolved_klass()) {
2317 // This will force loading of the class
2318 Klass* klass = cp->klass_at(i, CHECK);
2319 if (klass->is_instance_klass()) {
2320 // Force initialization of class
2321 InstanceKlass::cast(klass)->initialize(CHECK);
2322 }
2323 }
2324 }
2325 }
2326
2327 #endif
2328
2329
2330 // Printing
2331
2332 void ConstantPool::print_on(outputStream* st) const {
2333 assert(is_constantPool(), "must be constantPool");
2334 st->print_cr("%s", internal_name());
2335 if (flags() != 0) {
2336 st->print(" - flags: 0x%x", flags());
2337 if (has_preresolution()) st->print(" has_preresolution");
2338 if (on_stack()) st->print(" on_stack");
2339 st->cr();
2340 }
2341 if (pool_holder() != NULL) {
2342 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
2343 }
2344 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
2345 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
2346 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
2347 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
2348
2349 for (int index = 1; index < length(); index++) { // Index 0 is unused
2350 ((ConstantPool*)this)->print_entry_on(index, st);
2351 switch (tag_at(index).value()) {
2352 case JVM_CONSTANT_Long :
2353 case JVM_CONSTANT_Double :
2354 index++; // Skip entry following eigth-byte constant
2355 }
2356
2357 }
2358 st->cr();
2359 }
2360
2361 // Print one constant pool entry
2362 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2363 EXCEPTION_MARK;
2364 st->print(" - %3d : ", index);
2365 tag_at(index).print_on(st);
2366 st->print(" : ");
2367 switch (tag_at(index).value()) {
2368 case JVM_CONSTANT_Class :
2369 { Klass* k = klass_at(index, CATCH);
2370 guarantee(k != NULL, "need klass");
2371 k->print_value_on(st);
2372 st->print(" {" PTR_FORMAT "}", p2i(k));
2373 }
2374 break;
2375 case JVM_CONSTANT_Fieldref :
2376 case JVM_CONSTANT_Methodref :
2377 case JVM_CONSTANT_InterfaceMethodref :
2378 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2379 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2380 break;
2381 case JVM_CONSTANT_String :
2382 if (is_pseudo_string_at(index)) {
2383 oop anObj = pseudo_string_at(index);
2384 anObj->print_value_on(st);
2385 st->print(" {" PTR_FORMAT "}", p2i(anObj));
2386 } else {
2387 unresolved_string_at(index)->print_value_on(st);
2388 }
2389 break;
2390 case JVM_CONSTANT_Integer :
2391 st->print("%d", int_at(index));
2392 break;
2393 case JVM_CONSTANT_Float :
2394 st->print("%f", float_at(index));
2395 break;
2396 case JVM_CONSTANT_Long :
2397 st->print_jlong(long_at(index));
2398 break;
2399 case JVM_CONSTANT_Double :
2400 st->print("%lf", double_at(index));
2401 break;
2402 case JVM_CONSTANT_NameAndType :
2403 st->print("name_index=%d", name_ref_index_at(index));
2404 st->print(" signature_index=%d", signature_ref_index_at(index));
2405 break;
2406 case JVM_CONSTANT_Utf8 :
2407 symbol_at(index)->print_value_on(st);
2408 break;
2409 case JVM_CONSTANT_ClassIndex: {
2410 int name_index = *int_at_addr(index);
2411 st->print("klass_index=%d ", name_index);
2412 symbol_at(name_index)->print_value_on(st);
2413 }
2414 break;
2415 case JVM_CONSTANT_UnresolvedClass : // fall-through
2416 case JVM_CONSTANT_UnresolvedClassInError: {
2417 CPKlassSlot kslot = klass_slot_at(index);
2418 int resolved_klass_index = kslot.resolved_klass_index();
2419 int name_index = kslot.name_index();
2420 assert(tag_at(name_index).is_symbol(), "sanity");
2421
2422 Klass* klass = resolved_klasses()->at(resolved_klass_index);
2423 if (klass != NULL) {
2424 klass->print_value_on(st);
2425 } else {
2426 symbol_at(name_index)->print_value_on(st);
2427 }
2428 }
2429 break;
2430 case JVM_CONSTANT_MethodHandle :
2431 case JVM_CONSTANT_MethodHandleInError :
2432 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2433 st->print(" ref_index=%d", method_handle_index_at(index));
2434 break;
2435 case JVM_CONSTANT_MethodType :
2436 case JVM_CONSTANT_MethodTypeInError :
2437 st->print("signature_index=%d", method_type_index_at(index));
2438 break;
2439 case JVM_CONSTANT_Dynamic :
2440 case JVM_CONSTANT_DynamicInError :
2441 {
2442 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
2443 st->print(" type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
2444 int argc = invoke_dynamic_argument_count_at(index);
2445 if (argc > 0) {
2446 for (int arg_i = 0; arg_i < argc; arg_i++) {
2447 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2448 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2449 }
2450 st->print("}");
2451 }
2452 }
2453 break;
2454 case JVM_CONSTANT_InvokeDynamic :
2455 {
2456 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
2457 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
2458 int argc = invoke_dynamic_argument_count_at(index);
2459 if (argc > 0) {
2460 for (int arg_i = 0; arg_i < argc; arg_i++) {
2461 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2462 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2463 }
2464 st->print("}");
2465 }
2466 }
2467 break;
2468 default:
2469 ShouldNotReachHere();
2470 break;
2471 }
2472 st->cr();
2473 }
2474
2475 void ConstantPool::print_value_on(outputStream* st) const {
2476 assert(is_constantPool(), "must be constantPool");
2477 st->print("constant pool [%d]", length());
2478 if (has_preresolution()) st->print("/preresolution");
2479 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2480 print_address_on(st);
2481 st->print(" for ");
2482 pool_holder()->print_value_on(st);
2483 if (pool_holder() != NULL) {
2484 bool extra = (pool_holder()->constants() != this);
2485 if (extra) st->print(" (extra)");
2486 }
2487 if (cache() != NULL) {
2488 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2489 }
2490 }
2491
2492 #if INCLUDE_SERVICES
2493 // Size Statistics
2494 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2495 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2496 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2497 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2498 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2499 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2500
2501 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2502 sz->_cp_refmap_bytes;
2503 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2504 }
2505 #endif // INCLUDE_SERVICES
2506
2507 // Verification
2508
2509 void ConstantPool::verify_on(outputStream* st) {
2510 guarantee(is_constantPool(), "object must be constant pool");
2511 for (int i = 0; i< length(); i++) {
2512 constantTag tag = tag_at(i);
2513 if (tag.is_klass() || tag.is_unresolved_klass()) {
2514 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2515 } else if (tag.is_symbol()) {
2516 CPSlot entry = slot_at(i);
2517 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2518 } else if (tag.is_string()) {
2519 CPSlot entry = slot_at(i);
2520 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2521 }
2522 }
2523 if (cache() != NULL) {
2524 // Note: cache() can be NULL before a class is completely setup or
2525 // in temporary constant pools used during constant pool merging
2526 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2527 }
2528 if (pool_holder() != NULL) {
2529 // Note: pool_holder() can be NULL in temporary constant pools
2530 // used during constant pool merging
2531 guarantee(pool_holder()->is_klass(), "should be klass");
2532 }
2533 }
2534
2535
2536 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2537 char *str = sym->as_utf8();
2538 unsigned int hash = compute_hash(str, sym->utf8_length());
2539 unsigned int index = hash % table_size();
2540
2541 // check if already in map
2542 // we prefer the first entry since it is more likely to be what was used in
2543 // the class file
2544 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2545 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2546 if (en->hash() == hash && en->symbol() == sym) {
2547 return; // already there
2548 }
2549 }
2550
2551 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2552 entry->set_next(bucket(index));
2553 _buckets[index].set_entry(entry);
2554 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2555 }
2556
2557 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2558 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2559 char *str = sym->as_utf8();
2560 int len = sym->utf8_length();
2561 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2562 unsigned int index = hash % table_size();
2563 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2564 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2565 if (en->hash() == hash && en->symbol() == sym) {
2566 return en;
2567 }
2568 }
2569 return NULL;
2570 }
2571
2572 void SymbolHashMap::initialize_table(int table_size) {
2573 _table_size = table_size;
2574 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
2575 for (int index = 0; index < table_size; index++) {
2576 _buckets[index].clear();
2577 }
2578 }