1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/metadataOnStackMark.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/heapInspection.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/constantPool.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/objArrayKlass.hpp"
40 #include "oops/objArrayOop.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "runtime/fieldType.hpp"
43 #include "runtime/init.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/signature.hpp"
46 #include "runtime/vframe.hpp"
47 #include "utilities/copy.hpp"
48
49 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
50 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
51 int size = ConstantPool::size(length);
52 return new (loader_data, size, true, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
53 }
54
55 #ifdef ASSERT
56
57 // MetaspaceObj allocation invariant is calloc equivalent memory
58 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
59 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
60 assert(tags != NULL, "invariant");
61 const int length = tags->length();
62 for (int index = 0; index < length; ++index) {
63 if (JVM_CONSTANT_Invalid != tags->at(index)) {
64 return false;
65 }
66 }
67 return true;
68 }
69
70 #endif
71
72 ConstantPool::ConstantPool(Array<u1>* tags) :
73 _tags(tags),
74 _length(tags->length()) {
75
76 assert(_tags != NULL, "invariant");
77 assert(tags->length() == _length, "invariant");
78 assert(tag_array_is_zero_initialized(tags), "invariant");
79 assert(0 == flags(), "invariant");
80 assert(0 == version(), "invariant");
81 assert(NULL == _pool_holder, "invariant");
82 }
83
84 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
85 if (cache() != NULL) {
86 MetadataFactory::free_array<u2>(loader_data, reference_map());
87 set_reference_map(NULL);
88 MetadataFactory::free_metadata(loader_data, cache());
89 set_cache(NULL);
90 }
91
92 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
93 set_resolved_klasses(NULL);
94
95 MetadataFactory::free_array<jushort>(loader_data, operands());
96 set_operands(NULL);
97
98 release_C_heap_structures();
99
100 // free tag array
101 MetadataFactory::free_array<u1>(loader_data, tags());
102 set_tags(NULL);
103 }
104
105 void ConstantPool::release_C_heap_structures() {
106 // walk constant pool and decrement symbol reference counts
107 unreference_symbols();
108 }
109
110 objArrayOop ConstantPool::resolved_references() const {
111 return (objArrayOop)JNIHandles::resolve(_cache->resolved_references());
112 }
113
114 // Create resolved_references array and mapping array for original cp indexes
115 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
116 // to map it back for resolving and some unlikely miscellaneous uses.
117 // The objects created by invokedynamic are appended to this list.
118 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
119 const intStack& reference_map,
120 int constant_pool_map_length,
121 TRAPS) {
122 // Initialized the resolved object cache.
123 int map_length = reference_map.length();
124 if (map_length > 0) {
125 // Only need mapping back to constant pool entries. The map isn't used for
126 // invokedynamic resolved_reference entries. For invokedynamic entries,
127 // the constant pool cache index has the mapping back to both the constant
128 // pool and to the resolved reference index.
129 if (constant_pool_map_length > 0) {
130 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
131
132 for (int i = 0; i < constant_pool_map_length; i++) {
133 int x = reference_map.at(i);
134 assert(x == (int)(jushort) x, "klass index is too big");
135 om->at_put(i, (jushort)x);
136 }
137 set_reference_map(om);
138 }
139
140 // Create Java array for holding resolved strings, methodHandles,
141 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
142 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
143 Handle refs_handle (THREAD, (oop)stom); // must handleize.
144 set_resolved_references(loader_data->add_handle(refs_handle));
145 }
146 }
147
148 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
149 // A ConstantPool can't possibly have 0xffff valid class entries,
150 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
151 // entry for the class's name. So at most we will have 0xfffe class entries.
152 // This allows us to use 0xffff (ConstantPool::_invalid_resolved_klass_index) to indicate
153 // UnresolvedKlass entries that are temporarily created during class redefinition.
154 assert(num_klasses < _invalid_resolved_klass_index, "sanity");
155 assert(resolved_klasses() == NULL, "sanity");
156 Array<Klass*>* rk = MetadataFactory::new_writeable_array<Klass*>(loader_data, num_klasses, CHECK);
157 set_resolved_klasses(rk);
158 }
159
160 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
161 int len = length();
162 int num_klasses = 0;
163 for (int i = 1; i <len; i++) {
164 switch (tag_at(i).value()) {
165 case JVM_CONSTANT_ClassIndex:
166 {
167 const int class_index = klass_index_at(i);
168 unresolved_klass_at_put(i, class_index, num_klasses++);
169 }
170 break;
171 #ifndef PRODUCT
172 case JVM_CONSTANT_Class:
173 case JVM_CONSTANT_UnresolvedClass:
174 case JVM_CONSTANT_UnresolvedClassInError:
175 // All of these should have been reverted back to ClassIndex before calling
176 // this function.
177 ShouldNotReachHere();
178 #endif
179 }
180 }
181 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
182 }
183
184 void ConstantPool::klass_at_put(int which, int name_index, int resolved_klass_index, Klass* k, Symbol* name) {
185 assert(is_within_bounds(which), "index out of bounds");
186 assert(is_within_bounds(name_index), "index out of bounds");
187 assert((resolved_klass_index & 0xffff0000) == 0, "must be");
188 *int_at_addr(which) =
189 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index);
190
191 symbol_at_put(name_index, name);
192 name->increment_refcount();
193 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
194 OrderAccess::release_store_ptr((Klass* volatile *)adr, k);
195
196 // The interpreter assumes when the tag is stored, the klass is resolved
197 // and the Klass* non-NULL, so we need hardware store ordering here.
198 if (k != NULL) {
199 release_tag_at_put(which, JVM_CONSTANT_Class);
200 } else {
201 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass);
202 }
203 }
204
205 // CDS support. Create a new resolved_references array.
206 void ConstantPool::restore_unshareable_info(TRAPS) {
207 assert(is_constantPool(), "ensure C++ vtable is restored");
208 assert(on_stack(), "should always be set for shared constant pools");
209 assert(is_shared(), "should always be set for shared constant pools");
210
211 // Only create the new resolved references array if it hasn't been attempted before
212 if (resolved_references() != NULL) return;
213
214 // restore the C++ vtable from the shared archive
215 restore_vtable();
216
217 if (SystemDictionary::Object_klass_loaded()) {
218 // Recreate the object array and add to ClassLoaderData.
219 int map_length = resolved_reference_length();
220 if (map_length > 0) {
221 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
222 Handle refs_handle (THREAD, (oop)stom); // must handleize.
223
224 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
225 set_resolved_references(loader_data->add_handle(refs_handle));
226 }
227 }
228 }
229
230 void ConstantPool::remove_unshareable_info() {
231 // Resolved references are not in the shared archive.
232 // Save the length for restoration. It is not necessarily the same length
233 // as reference_map.length() if invokedynamic is saved.
234 set_resolved_reference_length(
235 resolved_references() != NULL ? resolved_references()->length() : 0);
236 set_resolved_references(NULL);
237
238 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
239 // The _on_stack flag is used to prevent ConstantPools from deallocation during
240 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
241 // we always set _on_stack to true to avoid having to change _flags during runtime.
242 _flags |= (_on_stack | _is_shared);
243 }
244
245 int ConstantPool::cp_to_object_index(int cp_index) {
246 // this is harder don't do this so much.
247 int i = reference_map()->find(cp_index);
248 // We might not find the index for jsr292 call.
249 return (i < 0) ? _no_index_sentinel : i;
250 }
251
252 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
253 resolved_references()->obj_at_put(obj_index, str);
254 }
255
256 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
257 ResourceMark rm;
258 int line_number = -1;
259 const char * source_file = NULL;
260 if (JavaThread::current()->has_last_Java_frame()) {
261 // try to identify the method which called this function.
262 vframeStream vfst(JavaThread::current());
263 if (!vfst.at_end()) {
264 line_number = vfst.method()->line_number_from_bci(vfst.bci());
265 Symbol* s = vfst.method()->method_holder()->source_file_name();
266 if (s != NULL) {
267 source_file = s->as_C_string();
268 }
269 }
270 }
271 if (k != this_cp->pool_holder()) {
272 // only print something if the classes are different
273 if (source_file != NULL) {
274 log_debug(class, resolve)("%s %s %s:%d",
275 this_cp->pool_holder()->external_name(),
276 k->external_name(), source_file, line_number);
277 } else {
278 log_debug(class, resolve)("%s %s",
279 this_cp->pool_holder()->external_name(),
280 k->external_name());
281 }
282 }
283 }
284
285 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
286 bool save_resolution_error, TRAPS) {
287 assert(THREAD->is_Java_thread(), "must be a Java thread");
288
289 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
290 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
291 // the entry and tag is not updated atomicly.
292 CPKlassSlot kslot = this_cp->klass_slot_at(which);
293 int resolved_klass_index = kslot.resolved_klass_index();
294 int name_index = kslot.name_index();
295 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
296
297 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
298 if (klass != NULL) {
299 return klass;
300 }
301
302 // This tag doesn't change back to unresolved class unless at a safepoint.
303 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
304 // The original attempt to resolve this constant pool entry failed so find the
305 // class of the original error and throw another error of the same class
306 // (JVMS 5.4.3).
307 // If there is a detail message, pass that detail message to the error.
308 // The JVMS does not strictly require us to duplicate the same detail message,
309 // or any internal exception fields such as cause or stacktrace. But since the
310 // detail message is often a class name or other literal string, we will repeat it
311 // if we can find it in the symbol table.
312 throw_resolution_error(this_cp, which, CHECK_0);
313 ShouldNotReachHere();
314 }
315
316 Handle mirror_handle;
317 Symbol* name = this_cp->symbol_at(name_index);
318 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
319 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
320 Klass* k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
321 if (!HAS_PENDING_EXCEPTION) {
322 // preserve the resolved klass from unloading
323 mirror_handle = Handle(THREAD, k->java_mirror());
324 // Do access check for klasses
325 verify_constant_pool_resolve(this_cp, k, THREAD);
326 }
327
328 // Failed to resolve class. We must record the errors so that subsequent attempts
329 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
330 if (HAS_PENDING_EXCEPTION) {
331 if (save_resolution_error) {
332 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
333 // If CHECK_NULL above doesn't return the exception, that means that
334 // some other thread has beaten us and has resolved the class.
335 // To preserve old behavior, we return the resolved class.
336 klass = this_cp->resolved_klasses()->at(resolved_klass_index);
337 assert(klass != NULL, "must be resolved if exception was cleared");
338 return klass;
339 } else {
340 return NULL; // return the pending exception
341 }
342 }
343
344 // Make this class loader depend upon the class loader owning the class reference
345 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
346 this_key->record_dependency(k, CHECK_NULL); // Can throw OOM
347
348 // logging for class+resolve.
349 if (log_is_enabled(Debug, class, resolve)){
350 trace_class_resolution(this_cp, k);
351 }
352 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
353 OrderAccess::release_store_ptr((Klass* volatile *)adr, k);
354 // The interpreter assumes when the tag is stored, the klass is resolved
355 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
356 // hardware store ordering here.
357 this_cp->release_tag_at_put(which, JVM_CONSTANT_Class);
358 return k;
359 }
360
361
362 // Does not update ConstantPool* - to avoid any exception throwing. Used
363 // by compiler and exception handling. Also used to avoid classloads for
364 // instanceof operations. Returns NULL if the class has not been loaded or
365 // if the verification of constant pool failed
366 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
367 CPKlassSlot kslot = this_cp->klass_slot_at(which);
368 int resolved_klass_index = kslot.resolved_klass_index();
369 int name_index = kslot.name_index();
370 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
371
372 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
373 if (k != NULL) {
374 return k;
375 } else {
376 Thread *thread = Thread::current();
377 Symbol* name = this_cp->symbol_at(name_index);
378 oop loader = this_cp->pool_holder()->class_loader();
379 oop protection_domain = this_cp->pool_holder()->protection_domain();
380 Handle h_prot (thread, protection_domain);
381 Handle h_loader (thread, loader);
382 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
383
384 if (k != NULL) {
385 // Make sure that resolving is legal
386 EXCEPTION_MARK;
387 // return NULL if verification fails
388 verify_constant_pool_resolve(this_cp, k, THREAD);
389 if (HAS_PENDING_EXCEPTION) {
390 CLEAR_PENDING_EXCEPTION;
391 return NULL;
392 }
393 return k;
394 } else {
395 return k;
396 }
397 }
398 }
399
400
401 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) {
402 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which));
403 }
404
405
406 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
407 int which) {
408 if (cpool->cache() == NULL) return NULL; // nothing to load yet
409 int cache_index = decode_cpcache_index(which, true);
410 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
411 // FIXME: should be an assert
412 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
413 return NULL;
414 }
415 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
416 return e->method_if_resolved(cpool);
417 }
418
419
420 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
421 if (cpool->cache() == NULL) return false; // nothing to load yet
422 int cache_index = decode_cpcache_index(which, true);
423 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
424 return e->has_appendix();
425 }
426
427 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
428 if (cpool->cache() == NULL) return NULL; // nothing to load yet
429 int cache_index = decode_cpcache_index(which, true);
430 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
431 return e->appendix_if_resolved(cpool);
432 }
433
434
435 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
436 if (cpool->cache() == NULL) return false; // nothing to load yet
437 int cache_index = decode_cpcache_index(which, true);
438 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
439 return e->has_method_type();
440 }
441
442 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) {
443 if (cpool->cache() == NULL) return NULL; // nothing to load yet
444 int cache_index = decode_cpcache_index(which, true);
445 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
446 return e->method_type_if_resolved(cpool);
447 }
448
449
450 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
451 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
452 return symbol_at(name_index);
453 }
454
455
456 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
457 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
458 return symbol_at(signature_index);
459 }
460
461
462 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
463 int i = which;
464 if (!uncached && cache() != NULL) {
465 if (ConstantPool::is_invokedynamic_index(which)) {
466 // Invokedynamic index is index into the constant pool cache
467 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
468 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
469 assert(tag_at(pool_index).is_name_and_type(), "");
470 return pool_index;
471 }
472 // change byte-ordering and go via cache
473 i = remap_instruction_operand_from_cache(which);
474 } else {
475 if (tag_at(which).is_invoke_dynamic()) {
476 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
477 assert(tag_at(pool_index).is_name_and_type(), "");
478 return pool_index;
479 }
480 }
481 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
482 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
483 jint ref_index = *int_at_addr(i);
484 return extract_high_short_from_int(ref_index);
485 }
486
487 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
488 int pool_index = which;
489 if (!uncached && cache() != NULL) {
490 if (ConstantPool::is_invokedynamic_index(which)) {
491 // Invokedynamic index is index into resolved_references
492 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
493 } else {
494 // change byte-ordering and go via cache
495 pool_index = remap_instruction_operand_from_cache(which);
496 }
497 }
498 return tag_at(pool_index);
499 }
500
501 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
502 guarantee(!ConstantPool::is_invokedynamic_index(which),
503 "an invokedynamic instruction does not have a klass");
504 int i = which;
505 if (!uncached && cache() != NULL) {
506 // change byte-ordering and go via cache
507 i = remap_instruction_operand_from_cache(which);
508 }
509 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
510 jint ref_index = *int_at_addr(i);
511 return extract_low_short_from_int(ref_index);
512 }
513
514
515
516 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
517 int cpc_index = operand;
518 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
519 assert((int)(u2)cpc_index == cpc_index, "clean u2");
520 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
521 return member_index;
522 }
523
524
525 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
526 if (k->is_instance_klass() || k->is_objArray_klass()) {
527 InstanceKlass* holder = this_cp->pool_holder();
528 Klass* elem = k->is_instance_klass() ? k : ObjArrayKlass::cast(k)->bottom_klass();
529
530 // The element type could be a typeArray - we only need the access check if it is
531 // an reference to another class
532 if (elem->is_instance_klass()) {
533 LinkResolver::check_klass_accessability(holder, elem, CHECK);
534 }
535 }
536 }
537
538
539 int ConstantPool::name_ref_index_at(int which_nt) {
540 jint ref_index = name_and_type_at(which_nt);
541 return extract_low_short_from_int(ref_index);
542 }
543
544
545 int ConstantPool::signature_ref_index_at(int which_nt) {
546 jint ref_index = name_and_type_at(which_nt);
547 return extract_high_short_from_int(ref_index);
548 }
549
550
551 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
552 return klass_at(klass_ref_index_at(which), THREAD);
553 }
554
555 Symbol* ConstantPool::klass_name_at(int which) const {
556 return symbol_at(klass_slot_at(which).name_index());
557 }
558
559 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
560 jint ref_index = klass_ref_index_at(which);
561 return klass_at_noresolve(ref_index);
562 }
563
564 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
565 jint ref_index = uncached_klass_ref_index_at(which);
566 return klass_at_noresolve(ref_index);
567 }
568
569 char* ConstantPool::string_at_noresolve(int which) {
570 return unresolved_string_at(which)->as_C_string();
571 }
572
573 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
574 return FieldType::basic_type(symbol_at(which));
575 }
576
577
578 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
579 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
580 if (this_cp->tag_at(index).is_string()) {
581 this_cp->string_at(index, CHECK);
582 }
583 }
584 }
585
586 // Resolve all the classes in the constant pool. If they are all resolved,
587 // the constant pool is read-only. Enhancement: allocate cp entries to
588 // another metaspace, and copy to read-only or read-write space if this
589 // bit is set.
590 bool ConstantPool::resolve_class_constants(TRAPS) {
591 constantPoolHandle cp(THREAD, this);
592 for (int index = 1; index < length(); index++) { // Index 0 is unused
593 if (tag_at(index).is_unresolved_klass() &&
594 klass_at_if_loaded(cp, index) == NULL) {
595 return false;
596 }
597 }
598 // set_preresolution(); or some bit for future use
599 return true;
600 }
601
602 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
603 // Dig out the detailed message to reuse if possible
604 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
605 if (message != NULL) {
606 return message;
607 }
608
609 // Return specific message for the tag
610 switch (tag.value()) {
611 case JVM_CONSTANT_UnresolvedClass:
612 // return the class name in the error message
613 message = this_cp->klass_name_at(which);
614 break;
615 case JVM_CONSTANT_MethodHandle:
616 // return the method handle name in the error message
617 message = this_cp->method_handle_name_ref_at(which);
618 break;
619 case JVM_CONSTANT_MethodType:
620 // return the method type signature in the error message
621 message = this_cp->method_type_signature_at(which);
622 break;
623 default:
624 ShouldNotReachHere();
625 }
626
627 return message;
628 }
629
630 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
631 Symbol* message = NULL;
632 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
633 assert(error != NULL && message != NULL, "checking");
634 CLEAR_PENDING_EXCEPTION;
635 ResourceMark rm;
636 THROW_MSG(error, message->as_C_string());
637 }
638
639 // If resolution for Class, MethodHandle or MethodType fails, save the exception
640 // in the resolution error table, so that the same exception is thrown again.
641 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
642 constantTag tag, TRAPS) {
643 Symbol* error = PENDING_EXCEPTION->klass()->name();
644
645 int error_tag = tag.error_value();
646
647 if (!PENDING_EXCEPTION->
648 is_a(SystemDictionary::LinkageError_klass())) {
649 // Just throw the exception and don't prevent these classes from
650 // being loaded due to virtual machine errors like StackOverflow
651 // and OutOfMemoryError, etc, or if the thread was hit by stop()
652 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
653 } else if (this_cp->tag_at(which).value() != error_tag) {
654 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
655 SystemDictionary::add_resolution_error(this_cp, which, error, message);
656 // CAS in the tag. If a thread beat us to registering this error that's fine.
657 // If another thread resolved the reference, this is a race condition. This
658 // thread may have had a security manager or something temporary.
659 // This doesn't deterministically get an error. So why do we save this?
660 // We save this because jvmti can add classes to the bootclass path after
661 // this error, so it needs to get the same error if the error is first.
662 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag,
663 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
664 if (old_tag != error_tag && old_tag != tag.value()) {
665 // MethodHandles and MethodType doesn't change to resolved version.
666 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
667 // Forget the exception and use the resolved class.
668 CLEAR_PENDING_EXCEPTION;
669 }
670 } else {
671 // some other thread put this in error state
672 throw_resolution_error(this_cp, which, CHECK);
673 }
674 }
675
676 // Called to resolve constants in the constant pool and return an oop.
677 // Some constant pool entries cache their resolved oop. This is also
678 // called to create oops from constants to use in arguments for invokedynamic
679 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) {
680 oop result_oop = NULL;
681 Handle throw_exception;
682
683 if (cache_index == _possible_index_sentinel) {
684 // It is possible that this constant is one which is cached in the objects.
685 // We'll do a linear search. This should be OK because this usage is rare.
686 assert(index > 0, "valid index");
687 cache_index = this_cp->cp_to_object_index(index);
688 }
689 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
690 assert(index == _no_index_sentinel || index >= 0, "");
691
692 if (cache_index >= 0) {
693 result_oop = this_cp->resolved_references()->obj_at(cache_index);
694 if (result_oop != NULL) {
695 return result_oop;
696 // That was easy...
697 }
698 index = this_cp->object_to_cp_index(cache_index);
699 }
700
701 jvalue prim_value; // temp used only in a few cases below
702
703 constantTag tag = this_cp->tag_at(index);
704
705 switch (tag.value()) {
706
707 case JVM_CONSTANT_UnresolvedClass:
708 case JVM_CONSTANT_UnresolvedClassInError:
709 case JVM_CONSTANT_Class:
710 {
711 assert(cache_index == _no_index_sentinel, "should not have been set");
712 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
713 // ldc wants the java mirror.
714 result_oop = resolved->java_mirror();
715 break;
716 }
717
718 case JVM_CONSTANT_String:
719 assert(cache_index != _no_index_sentinel, "should have been set");
720 if (this_cp->is_pseudo_string_at(index)) {
721 result_oop = this_cp->pseudo_string_at(index, cache_index);
722 break;
723 }
724 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
725 break;
726
727 case JVM_CONSTANT_MethodHandleInError:
728 case JVM_CONSTANT_MethodTypeInError:
729 {
730 throw_resolution_error(this_cp, index, CHECK_NULL);
731 break;
732 }
733
734 case JVM_CONSTANT_MethodHandle:
735 {
736 int ref_kind = this_cp->method_handle_ref_kind_at(index);
737 int callee_index = this_cp->method_handle_klass_index_at(index);
738 Symbol* name = this_cp->method_handle_name_ref_at(index);
739 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
740 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
741 { ResourceMark rm(THREAD);
742 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
743 ref_kind, index, this_cp->method_handle_index_at(index),
744 callee_index, name->as_C_string(), signature->as_C_string());
745 }
746
747 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
748
749 // Check constant pool method consistency
750 if ((callee->is_interface() && m_tag.is_method()) ||
751 ((!callee->is_interface() && m_tag.is_interface_method()))) {
752 ResourceMark rm(THREAD);
753 char buf[400];
754 jio_snprintf(buf, sizeof(buf),
755 "Inconsistent constant pool data in classfile for class %s. "
756 "Method %s%s at index %d is %s and should be %s",
757 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index,
758 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
759 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
760 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
761 }
762
763 Klass* klass = this_cp->pool_holder();
764 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
765 callee, name, signature,
766 THREAD);
767 result_oop = value();
768 if (HAS_PENDING_EXCEPTION) {
769 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
770 }
771 break;
772 }
773
774 case JVM_CONSTANT_MethodType:
775 {
776 Symbol* signature = this_cp->method_type_signature_at(index);
777 { ResourceMark rm(THREAD);
778 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
779 index, this_cp->method_type_index_at(index),
780 signature->as_C_string());
781 }
782 Klass* klass = this_cp->pool_holder();
783 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
784 result_oop = value();
785 if (HAS_PENDING_EXCEPTION) {
786 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
787 }
788 break;
789 }
790
791 case JVM_CONSTANT_Integer:
792 assert(cache_index == _no_index_sentinel, "should not have been set");
793 prim_value.i = this_cp->int_at(index);
794 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
795 break;
796
797 case JVM_CONSTANT_Float:
798 assert(cache_index == _no_index_sentinel, "should not have been set");
799 prim_value.f = this_cp->float_at(index);
800 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
801 break;
802
803 case JVM_CONSTANT_Long:
804 assert(cache_index == _no_index_sentinel, "should not have been set");
805 prim_value.j = this_cp->long_at(index);
806 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
807 break;
808
809 case JVM_CONSTANT_Double:
810 assert(cache_index == _no_index_sentinel, "should not have been set");
811 prim_value.d = this_cp->double_at(index);
812 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
813 break;
814
815 default:
816 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
817 this_cp(), index, cache_index, tag.value()));
818 assert(false, "unexpected constant tag");
819 break;
820 }
821
822 if (cache_index >= 0) {
823 // Benign race condition: resolved_references may already be filled in.
824 // The important thing here is that all threads pick up the same result.
825 // It doesn't matter which racing thread wins, as long as only one
826 // result is used by all threads, and all future queries.
827 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL);
828 if (old_result == NULL) {
829 return result_oop; // was installed
830 } else {
831 // Return the winning thread's result. This can be different than
832 // the result here for MethodHandles.
833 return old_result;
834 }
835 } else {
836 return result_oop;
837 }
838 }
839
840 oop ConstantPool::uncached_string_at(int which, TRAPS) {
841 Symbol* sym = unresolved_string_at(which);
842 oop str = StringTable::intern(sym, CHECK_(NULL));
843 assert(java_lang_String::is_instance(str), "must be string");
844 return str;
845 }
846
847
848 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) {
849 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
850
851 Handle bsm;
852 int argc;
853 {
854 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
855 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
856 // It is accompanied by the optional arguments.
857 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
858 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
859 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
860 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
861 }
862
863 // Extract the optional static arguments.
864 argc = this_cp->invoke_dynamic_argument_count_at(index);
865 if (argc == 0) return bsm_oop;
866
867 bsm = Handle(THREAD, bsm_oop);
868 }
869
870 objArrayHandle info;
871 {
872 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
873 info = objArrayHandle(THREAD, info_oop);
874 }
875
876 info->obj_at_put(0, bsm());
877 for (int i = 0; i < argc; i++) {
878 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i);
879 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
880 info->obj_at_put(1+i, arg_oop);
881 }
882
883 return info();
884 }
885
886 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
887 // If the string has already been interned, this entry will be non-null
888 oop str = this_cp->resolved_references()->obj_at(obj_index);
889 if (str != NULL) return str;
890 Symbol* sym = this_cp->unresolved_string_at(which);
891 str = StringTable::intern(sym, CHECK_(NULL));
892 this_cp->string_at_put(which, obj_index, str);
893 assert(java_lang_String::is_instance(str), "must be string");
894 return str;
895 }
896
897
898 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
899 // Names are interned, so we can compare Symbol*s directly
900 Symbol* cp_name = klass_name_at(which);
901 return (cp_name == k->name());
902 }
903
904
905 // Iterate over symbols and decrement ones which are Symbol*s
906 // This is done during GC.
907 // Only decrement the UTF8 symbols. Strings point to
908 // these symbols but didn't increment the reference count.
909 void ConstantPool::unreference_symbols() {
910 for (int index = 1; index < length(); index++) { // Index 0 is unused
911 constantTag tag = tag_at(index);
912 if (tag.is_symbol()) {
913 symbol_at(index)->decrement_refcount();
914 }
915 }
916 }
917
918
919 // Compare this constant pool's entry at index1 to the constant pool
920 // cp2's entry at index2.
921 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
922 int index2, TRAPS) {
923
924 // The error tags are equivalent to non-error tags when comparing
925 jbyte t1 = tag_at(index1).non_error_value();
926 jbyte t2 = cp2->tag_at(index2).non_error_value();
927
928 if (t1 != t2) {
929 // Not the same entry type so there is nothing else to check. Note
930 // that this style of checking will consider resolved/unresolved
931 // class pairs as different.
932 // From the ConstantPool* API point of view, this is correct
933 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
934 // plays out in the context of ConstantPool* merging.
935 return false;
936 }
937
938 switch (t1) {
939 case JVM_CONSTANT_Class:
940 {
941 Klass* k1 = klass_at(index1, CHECK_false);
942 Klass* k2 = cp2->klass_at(index2, CHECK_false);
943 if (k1 == k2) {
944 return true;
945 }
946 } break;
947
948 case JVM_CONSTANT_ClassIndex:
949 {
950 int recur1 = klass_index_at(index1);
951 int recur2 = cp2->klass_index_at(index2);
952 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
953 if (match) {
954 return true;
955 }
956 } break;
957
958 case JVM_CONSTANT_Double:
959 {
960 jdouble d1 = double_at(index1);
961 jdouble d2 = cp2->double_at(index2);
962 if (d1 == d2) {
963 return true;
964 }
965 } break;
966
967 case JVM_CONSTANT_Fieldref:
968 case JVM_CONSTANT_InterfaceMethodref:
969 case JVM_CONSTANT_Methodref:
970 {
971 int recur1 = uncached_klass_ref_index_at(index1);
972 int recur2 = cp2->uncached_klass_ref_index_at(index2);
973 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
974 if (match) {
975 recur1 = uncached_name_and_type_ref_index_at(index1);
976 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
977 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
978 if (match) {
979 return true;
980 }
981 }
982 } break;
983
984 case JVM_CONSTANT_Float:
985 {
986 jfloat f1 = float_at(index1);
987 jfloat f2 = cp2->float_at(index2);
988 if (f1 == f2) {
989 return true;
990 }
991 } break;
992
993 case JVM_CONSTANT_Integer:
994 {
995 jint i1 = int_at(index1);
996 jint i2 = cp2->int_at(index2);
997 if (i1 == i2) {
998 return true;
999 }
1000 } break;
1001
1002 case JVM_CONSTANT_Long:
1003 {
1004 jlong l1 = long_at(index1);
1005 jlong l2 = cp2->long_at(index2);
1006 if (l1 == l2) {
1007 return true;
1008 }
1009 } break;
1010
1011 case JVM_CONSTANT_NameAndType:
1012 {
1013 int recur1 = name_ref_index_at(index1);
1014 int recur2 = cp2->name_ref_index_at(index2);
1015 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1016 if (match) {
1017 recur1 = signature_ref_index_at(index1);
1018 recur2 = cp2->signature_ref_index_at(index2);
1019 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1020 if (match) {
1021 return true;
1022 }
1023 }
1024 } break;
1025
1026 case JVM_CONSTANT_StringIndex:
1027 {
1028 int recur1 = string_index_at(index1);
1029 int recur2 = cp2->string_index_at(index2);
1030 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1031 if (match) {
1032 return true;
1033 }
1034 } break;
1035
1036 case JVM_CONSTANT_UnresolvedClass:
1037 {
1038 Symbol* k1 = klass_name_at(index1);
1039 Symbol* k2 = cp2->klass_name_at(index2);
1040 if (k1 == k2) {
1041 return true;
1042 }
1043 } break;
1044
1045 case JVM_CONSTANT_MethodType:
1046 {
1047 int k1 = method_type_index_at(index1);
1048 int k2 = cp2->method_type_index_at(index2);
1049 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1050 if (match) {
1051 return true;
1052 }
1053 } break;
1054
1055 case JVM_CONSTANT_MethodHandle:
1056 {
1057 int k1 = method_handle_ref_kind_at(index1);
1058 int k2 = cp2->method_handle_ref_kind_at(index2);
1059 if (k1 == k2) {
1060 int i1 = method_handle_index_at(index1);
1061 int i2 = cp2->method_handle_index_at(index2);
1062 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1063 if (match) {
1064 return true;
1065 }
1066 }
1067 } break;
1068
1069 case JVM_CONSTANT_InvokeDynamic:
1070 {
1071 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1072 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1073 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
1074 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
1075 // separate statements and variables because CHECK_false is used
1076 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1077 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1078 return (match_entry && match_operand);
1079 } break;
1080
1081 case JVM_CONSTANT_String:
1082 {
1083 Symbol* s1 = unresolved_string_at(index1);
1084 Symbol* s2 = cp2->unresolved_string_at(index2);
1085 if (s1 == s2) {
1086 return true;
1087 }
1088 } break;
1089
1090 case JVM_CONSTANT_Utf8:
1091 {
1092 Symbol* s1 = symbol_at(index1);
1093 Symbol* s2 = cp2->symbol_at(index2);
1094 if (s1 == s2) {
1095 return true;
1096 }
1097 } break;
1098
1099 // Invalid is used as the tag for the second constant pool entry
1100 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1101 // not be seen by itself.
1102 case JVM_CONSTANT_Invalid: // fall through
1103
1104 default:
1105 ShouldNotReachHere();
1106 break;
1107 }
1108
1109 return false;
1110 } // end compare_entry_to()
1111
1112
1113 // Resize the operands array with delta_len and delta_size.
1114 // Used in RedefineClasses for CP merge.
1115 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1116 int old_len = operand_array_length(operands());
1117 int new_len = old_len + delta_len;
1118 int min_len = (delta_len > 0) ? old_len : new_len;
1119
1120 int old_size = operands()->length();
1121 int new_size = old_size + delta_size;
1122 int min_size = (delta_size > 0) ? old_size : new_size;
1123
1124 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1125 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1126
1127 // Set index in the resized array for existing elements only
1128 for (int idx = 0; idx < min_len; idx++) {
1129 int offset = operand_offset_at(idx); // offset in original array
1130 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1131 }
1132 // Copy the bootstrap specifiers only
1133 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1134 new_ops->adr_at(2*new_len),
1135 (min_size - 2*min_len) * sizeof(u2));
1136 // Explicitly deallocate old operands array.
1137 // Note, it is not needed for 7u backport.
1138 if ( operands() != NULL) { // the safety check
1139 MetadataFactory::free_array<u2>(loader_data, operands());
1140 }
1141 set_operands(new_ops);
1142 } // end resize_operands()
1143
1144
1145 // Extend the operands array with the length and size of the ext_cp operands.
1146 // Used in RedefineClasses for CP merge.
1147 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1148 int delta_len = operand_array_length(ext_cp->operands());
1149 if (delta_len == 0) {
1150 return; // nothing to do
1151 }
1152 int delta_size = ext_cp->operands()->length();
1153
1154 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1155
1156 if (operand_array_length(operands()) == 0) {
1157 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1158 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1159 // The first element index defines the offset of second part
1160 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1161 set_operands(new_ops);
1162 } else {
1163 resize_operands(delta_len, delta_size, CHECK);
1164 }
1165
1166 } // end extend_operands()
1167
1168
1169 // Shrink the operands array to a smaller array with new_len length.
1170 // Used in RedefineClasses for CP merge.
1171 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1172 int old_len = operand_array_length(operands());
1173 if (new_len == old_len) {
1174 return; // nothing to do
1175 }
1176 assert(new_len < old_len, "shrunken operands array must be smaller");
1177
1178 int free_base = operand_next_offset_at(new_len - 1);
1179 int delta_len = new_len - old_len;
1180 int delta_size = 2*delta_len + free_base - operands()->length();
1181
1182 resize_operands(delta_len, delta_size, CHECK);
1183
1184 } // end shrink_operands()
1185
1186
1187 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1188 const constantPoolHandle& to_cp,
1189 TRAPS) {
1190
1191 int from_oplen = operand_array_length(from_cp->operands());
1192 int old_oplen = operand_array_length(to_cp->operands());
1193 if (from_oplen != 0) {
1194 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1195 // append my operands to the target's operands array
1196 if (old_oplen == 0) {
1197 // Can't just reuse from_cp's operand list because of deallocation issues
1198 int len = from_cp->operands()->length();
1199 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1200 Copy::conjoint_memory_atomic(
1201 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1202 to_cp->set_operands(new_ops);
1203 } else {
1204 int old_len = to_cp->operands()->length();
1205 int from_len = from_cp->operands()->length();
1206 int old_off = old_oplen * sizeof(u2);
1207 int from_off = from_oplen * sizeof(u2);
1208 // Use the metaspace for the destination constant pool
1209 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1210 int fillp = 0, len = 0;
1211 // first part of dest
1212 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1213 new_operands->adr_at(fillp),
1214 (len = old_off) * sizeof(u2));
1215 fillp += len;
1216 // first part of src
1217 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1218 new_operands->adr_at(fillp),
1219 (len = from_off) * sizeof(u2));
1220 fillp += len;
1221 // second part of dest
1222 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1223 new_operands->adr_at(fillp),
1224 (len = old_len - old_off) * sizeof(u2));
1225 fillp += len;
1226 // second part of src
1227 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1228 new_operands->adr_at(fillp),
1229 (len = from_len - from_off) * sizeof(u2));
1230 fillp += len;
1231 assert(fillp == new_operands->length(), "");
1232
1233 // Adjust indexes in the first part of the copied operands array.
1234 for (int j = 0; j < from_oplen; j++) {
1235 int offset = operand_offset_at(new_operands, old_oplen + j);
1236 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1237 offset += old_len; // every new tuple is preceded by old_len extra u2's
1238 operand_offset_at_put(new_operands, old_oplen + j, offset);
1239 }
1240
1241 // replace target operands array with combined array
1242 to_cp->set_operands(new_operands);
1243 }
1244 }
1245 } // end copy_operands()
1246
1247
1248 // Copy this constant pool's entries at start_i to end_i (inclusive)
1249 // to the constant pool to_cp's entries starting at to_i. A total of
1250 // (end_i - start_i) + 1 entries are copied.
1251 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1252 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1253
1254
1255 int dest_i = to_i; // leave original alone for debug purposes
1256
1257 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1258 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1259
1260 switch (from_cp->tag_at(src_i).value()) {
1261 case JVM_CONSTANT_Double:
1262 case JVM_CONSTANT_Long:
1263 // double and long take two constant pool entries
1264 src_i += 2;
1265 dest_i += 2;
1266 break;
1267
1268 default:
1269 // all others take one constant pool entry
1270 src_i++;
1271 dest_i++;
1272 break;
1273 }
1274 }
1275 copy_operands(from_cp, to_cp, CHECK);
1276
1277 } // end copy_cp_to_impl()
1278
1279
1280 // Copy this constant pool's entry at from_i to the constant pool
1281 // to_cp's entry at to_i.
1282 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1283 const constantPoolHandle& to_cp, int to_i,
1284 TRAPS) {
1285
1286 int tag = from_cp->tag_at(from_i).value();
1287 switch (tag) {
1288 case JVM_CONSTANT_ClassIndex:
1289 {
1290 jint ki = from_cp->klass_index_at(from_i);
1291 to_cp->klass_index_at_put(to_i, ki);
1292 } break;
1293
1294 case JVM_CONSTANT_Double:
1295 {
1296 jdouble d = from_cp->double_at(from_i);
1297 to_cp->double_at_put(to_i, d);
1298 // double takes two constant pool entries so init second entry's tag
1299 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1300 } break;
1301
1302 case JVM_CONSTANT_Fieldref:
1303 {
1304 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1305 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1306 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1307 } break;
1308
1309 case JVM_CONSTANT_Float:
1310 {
1311 jfloat f = from_cp->float_at(from_i);
1312 to_cp->float_at_put(to_i, f);
1313 } break;
1314
1315 case JVM_CONSTANT_Integer:
1316 {
1317 jint i = from_cp->int_at(from_i);
1318 to_cp->int_at_put(to_i, i);
1319 } break;
1320
1321 case JVM_CONSTANT_InterfaceMethodref:
1322 {
1323 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1324 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1325 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1326 } break;
1327
1328 case JVM_CONSTANT_Long:
1329 {
1330 jlong l = from_cp->long_at(from_i);
1331 to_cp->long_at_put(to_i, l);
1332 // long takes two constant pool entries so init second entry's tag
1333 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1334 } break;
1335
1336 case JVM_CONSTANT_Methodref:
1337 {
1338 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1339 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1340 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1341 } break;
1342
1343 case JVM_CONSTANT_NameAndType:
1344 {
1345 int name_ref_index = from_cp->name_ref_index_at(from_i);
1346 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1347 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1348 } break;
1349
1350 case JVM_CONSTANT_StringIndex:
1351 {
1352 jint si = from_cp->string_index_at(from_i);
1353 to_cp->string_index_at_put(to_i, si);
1354 } break;
1355
1356 case JVM_CONSTANT_Class:
1357 case JVM_CONSTANT_UnresolvedClass:
1358 case JVM_CONSTANT_UnresolvedClassInError:
1359 {
1360 // Revert to JVM_CONSTANT_ClassIndex
1361 int name_index = from_cp->klass_slot_at(from_i).name_index();
1362 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1363 to_cp->klass_index_at_put(to_i, name_index);
1364 } break;
1365
1366 case JVM_CONSTANT_String:
1367 {
1368 Symbol* s = from_cp->unresolved_string_at(from_i);
1369 to_cp->unresolved_string_at_put(to_i, s);
1370 } break;
1371
1372 case JVM_CONSTANT_Utf8:
1373 {
1374 Symbol* s = from_cp->symbol_at(from_i);
1375 // Need to increase refcount, the old one will be thrown away and deferenced
1376 s->increment_refcount();
1377 to_cp->symbol_at_put(to_i, s);
1378 } break;
1379
1380 case JVM_CONSTANT_MethodType:
1381 case JVM_CONSTANT_MethodTypeInError:
1382 {
1383 jint k = from_cp->method_type_index_at(from_i);
1384 to_cp->method_type_index_at_put(to_i, k);
1385 } break;
1386
1387 case JVM_CONSTANT_MethodHandle:
1388 case JVM_CONSTANT_MethodHandleInError:
1389 {
1390 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1391 int k2 = from_cp->method_handle_index_at(from_i);
1392 to_cp->method_handle_index_at_put(to_i, k1, k2);
1393 } break;
1394
1395 case JVM_CONSTANT_InvokeDynamic:
1396 {
1397 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1398 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1399 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1400 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1401 } break;
1402
1403 // Invalid is used as the tag for the second constant pool entry
1404 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1405 // not be seen by itself.
1406 case JVM_CONSTANT_Invalid: // fall through
1407
1408 default:
1409 {
1410 ShouldNotReachHere();
1411 } break;
1412 }
1413 } // end copy_entry_to()
1414
1415 // Search constant pool search_cp for an entry that matches this
1416 // constant pool's entry at pattern_i. Returns the index of a
1417 // matching entry or zero (0) if there is no matching entry.
1418 int ConstantPool::find_matching_entry(int pattern_i,
1419 const constantPoolHandle& search_cp, TRAPS) {
1420
1421 // index zero (0) is not used
1422 for (int i = 1; i < search_cp->length(); i++) {
1423 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1424 if (found) {
1425 return i;
1426 }
1427 }
1428
1429 return 0; // entry not found; return unused index zero (0)
1430 } // end find_matching_entry()
1431
1432
1433 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1434 // cp2's bootstrap specifier at idx2.
1435 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1436 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1437 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1438 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1439
1440 if (!match) {
1441 return false;
1442 }
1443 int argc = operand_argument_count_at(idx1);
1444 if (argc == cp2->operand_argument_count_at(idx2)) {
1445 for (int j = 0; j < argc; j++) {
1446 k1 = operand_argument_index_at(idx1, j);
1447 k2 = cp2->operand_argument_index_at(idx2, j);
1448 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1449 if (!match) {
1450 return false;
1451 }
1452 }
1453 return true; // got through loop; all elements equal
1454 }
1455 return false;
1456 } // end compare_operand_to()
1457
1458 // Search constant pool search_cp for a bootstrap specifier that matches
1459 // this constant pool's bootstrap specifier at pattern_i index.
1460 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
1461 int ConstantPool::find_matching_operand(int pattern_i,
1462 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1463 for (int i = 0; i < search_len; i++) {
1464 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1465 if (found) {
1466 return i;
1467 }
1468 }
1469 return -1; // bootstrap specifier not found; return unused index (-1)
1470 } // end find_matching_operand()
1471
1472
1473 #ifndef PRODUCT
1474
1475 const char* ConstantPool::printable_name_at(int which) {
1476
1477 constantTag tag = tag_at(which);
1478
1479 if (tag.is_string()) {
1480 return string_at_noresolve(which);
1481 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1482 return klass_name_at(which)->as_C_string();
1483 } else if (tag.is_symbol()) {
1484 return symbol_at(which)->as_C_string();
1485 }
1486 return "";
1487 }
1488
1489 #endif // PRODUCT
1490
1491
1492 // JVMTI GetConstantPool support
1493
1494 // For debugging of constant pool
1495 const bool debug_cpool = false;
1496
1497 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1498
1499 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1500 const char* WARN_MSG = "Must not be such entry!";
1501 jint size = 0;
1502 u2 idx1, idx2;
1503
1504 for (jint idx = 1; idx < cnt; idx++) {
1505 jint ent_size = 0;
1506 u1 tag = *bytes++;
1507 size++; // count tag
1508
1509 printf("const #%03d, tag: %02d ", idx, tag);
1510 switch(tag) {
1511 case JVM_CONSTANT_Invalid: {
1512 printf("Invalid");
1513 break;
1514 }
1515 case JVM_CONSTANT_Unicode: {
1516 printf("Unicode %s", WARN_MSG);
1517 break;
1518 }
1519 case JVM_CONSTANT_Utf8: {
1520 u2 len = Bytes::get_Java_u2(bytes);
1521 char str[128];
1522 if (len > 127) {
1523 len = 127;
1524 }
1525 strncpy(str, (char *) (bytes+2), len);
1526 str[len] = '\0';
1527 printf("Utf8 \"%s\"", str);
1528 ent_size = 2 + len;
1529 break;
1530 }
1531 case JVM_CONSTANT_Integer: {
1532 u4 val = Bytes::get_Java_u4(bytes);
1533 printf("int %d", *(int *) &val);
1534 ent_size = 4;
1535 break;
1536 }
1537 case JVM_CONSTANT_Float: {
1538 u4 val = Bytes::get_Java_u4(bytes);
1539 printf("float %5.3ff", *(float *) &val);
1540 ent_size = 4;
1541 break;
1542 }
1543 case JVM_CONSTANT_Long: {
1544 u8 val = Bytes::get_Java_u8(bytes);
1545 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1546 ent_size = 8;
1547 idx++; // Long takes two cpool slots
1548 break;
1549 }
1550 case JVM_CONSTANT_Double: {
1551 u8 val = Bytes::get_Java_u8(bytes);
1552 printf("double %5.3fd", *(jdouble *)&val);
1553 ent_size = 8;
1554 idx++; // Double takes two cpool slots
1555 break;
1556 }
1557 case JVM_CONSTANT_Class: {
1558 idx1 = Bytes::get_Java_u2(bytes);
1559 printf("class #%03d", idx1);
1560 ent_size = 2;
1561 break;
1562 }
1563 case JVM_CONSTANT_String: {
1564 idx1 = Bytes::get_Java_u2(bytes);
1565 printf("String #%03d", idx1);
1566 ent_size = 2;
1567 break;
1568 }
1569 case JVM_CONSTANT_Fieldref: {
1570 idx1 = Bytes::get_Java_u2(bytes);
1571 idx2 = Bytes::get_Java_u2(bytes+2);
1572 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1573 ent_size = 4;
1574 break;
1575 }
1576 case JVM_CONSTANT_Methodref: {
1577 idx1 = Bytes::get_Java_u2(bytes);
1578 idx2 = Bytes::get_Java_u2(bytes+2);
1579 printf("Method #%03d, #%03d", idx1, idx2);
1580 ent_size = 4;
1581 break;
1582 }
1583 case JVM_CONSTANT_InterfaceMethodref: {
1584 idx1 = Bytes::get_Java_u2(bytes);
1585 idx2 = Bytes::get_Java_u2(bytes+2);
1586 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1587 ent_size = 4;
1588 break;
1589 }
1590 case JVM_CONSTANT_NameAndType: {
1591 idx1 = Bytes::get_Java_u2(bytes);
1592 idx2 = Bytes::get_Java_u2(bytes+2);
1593 printf("NameAndType #%03d, #%03d", idx1, idx2);
1594 ent_size = 4;
1595 break;
1596 }
1597 case JVM_CONSTANT_ClassIndex: {
1598 printf("ClassIndex %s", WARN_MSG);
1599 break;
1600 }
1601 case JVM_CONSTANT_UnresolvedClass: {
1602 printf("UnresolvedClass: %s", WARN_MSG);
1603 break;
1604 }
1605 case JVM_CONSTANT_UnresolvedClassInError: {
1606 printf("UnresolvedClassInErr: %s", WARN_MSG);
1607 break;
1608 }
1609 case JVM_CONSTANT_StringIndex: {
1610 printf("StringIndex: %s", WARN_MSG);
1611 break;
1612 }
1613 }
1614 printf(";\n");
1615 bytes += ent_size;
1616 size += ent_size;
1617 }
1618 printf("Cpool size: %d\n", size);
1619 fflush(0);
1620 return;
1621 } /* end print_cpool_bytes */
1622
1623
1624 // Returns size of constant pool entry.
1625 jint ConstantPool::cpool_entry_size(jint idx) {
1626 switch(tag_at(idx).value()) {
1627 case JVM_CONSTANT_Invalid:
1628 case JVM_CONSTANT_Unicode:
1629 return 1;
1630
1631 case JVM_CONSTANT_Utf8:
1632 return 3 + symbol_at(idx)->utf8_length();
1633
1634 case JVM_CONSTANT_Class:
1635 case JVM_CONSTANT_String:
1636 case JVM_CONSTANT_ClassIndex:
1637 case JVM_CONSTANT_UnresolvedClass:
1638 case JVM_CONSTANT_UnresolvedClassInError:
1639 case JVM_CONSTANT_StringIndex:
1640 case JVM_CONSTANT_MethodType:
1641 case JVM_CONSTANT_MethodTypeInError:
1642 return 3;
1643
1644 case JVM_CONSTANT_MethodHandle:
1645 case JVM_CONSTANT_MethodHandleInError:
1646 return 4; //tag, ref_kind, ref_index
1647
1648 case JVM_CONSTANT_Integer:
1649 case JVM_CONSTANT_Float:
1650 case JVM_CONSTANT_Fieldref:
1651 case JVM_CONSTANT_Methodref:
1652 case JVM_CONSTANT_InterfaceMethodref:
1653 case JVM_CONSTANT_NameAndType:
1654 return 5;
1655
1656 case JVM_CONSTANT_InvokeDynamic:
1657 // u1 tag, u2 bsm, u2 nt
1658 return 5;
1659
1660 case JVM_CONSTANT_Long:
1661 case JVM_CONSTANT_Double:
1662 return 9;
1663 }
1664 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1665 return 1;
1666 } /* end cpool_entry_size */
1667
1668
1669 // SymbolHashMap is used to find a constant pool index from a string.
1670 // This function fills in SymbolHashMaps, one for utf8s and one for
1671 // class names, returns size of the cpool raw bytes.
1672 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1673 SymbolHashMap *classmap) {
1674 jint size = 0;
1675
1676 for (u2 idx = 1; idx < length(); idx++) {
1677 u2 tag = tag_at(idx).value();
1678 size += cpool_entry_size(idx);
1679
1680 switch(tag) {
1681 case JVM_CONSTANT_Utf8: {
1682 Symbol* sym = symbol_at(idx);
1683 symmap->add_entry(sym, idx);
1684 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1685 break;
1686 }
1687 case JVM_CONSTANT_Class:
1688 case JVM_CONSTANT_UnresolvedClass:
1689 case JVM_CONSTANT_UnresolvedClassInError: {
1690 Symbol* sym = klass_name_at(idx);
1691 classmap->add_entry(sym, idx);
1692 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1693 break;
1694 }
1695 case JVM_CONSTANT_Long:
1696 case JVM_CONSTANT_Double: {
1697 idx++; // Both Long and Double take two cpool slots
1698 break;
1699 }
1700 }
1701 }
1702 return size;
1703 } /* end hash_utf8_entries_to */
1704
1705
1706 // Copy cpool bytes.
1707 // Returns:
1708 // 0, in case of OutOfMemoryError
1709 // -1, in case of internal error
1710 // > 0, count of the raw cpool bytes that have been copied
1711 int ConstantPool::copy_cpool_bytes(int cpool_size,
1712 SymbolHashMap* tbl,
1713 unsigned char *bytes) {
1714 u2 idx1, idx2;
1715 jint size = 0;
1716 jint cnt = length();
1717 unsigned char *start_bytes = bytes;
1718
1719 for (jint idx = 1; idx < cnt; idx++) {
1720 u1 tag = tag_at(idx).value();
1721 jint ent_size = cpool_entry_size(idx);
1722
1723 assert(size + ent_size <= cpool_size, "Size mismatch");
1724
1725 *bytes = tag;
1726 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1727 switch(tag) {
1728 case JVM_CONSTANT_Invalid: {
1729 DBG(printf("JVM_CONSTANT_Invalid"));
1730 break;
1731 }
1732 case JVM_CONSTANT_Unicode: {
1733 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1734 DBG(printf("JVM_CONSTANT_Unicode"));
1735 break;
1736 }
1737 case JVM_CONSTANT_Utf8: {
1738 Symbol* sym = symbol_at(idx);
1739 char* str = sym->as_utf8();
1740 // Warning! It's crashing on x86 with len = sym->utf8_length()
1741 int len = (int) strlen(str);
1742 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1743 for (int i = 0; i < len; i++) {
1744 bytes[3+i] = (u1) str[i];
1745 }
1746 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1747 break;
1748 }
1749 case JVM_CONSTANT_Integer: {
1750 jint val = int_at(idx);
1751 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1752 break;
1753 }
1754 case JVM_CONSTANT_Float: {
1755 jfloat val = float_at(idx);
1756 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1757 break;
1758 }
1759 case JVM_CONSTANT_Long: {
1760 jlong val = long_at(idx);
1761 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1762 idx++; // Long takes two cpool slots
1763 break;
1764 }
1765 case JVM_CONSTANT_Double: {
1766 jdouble val = double_at(idx);
1767 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1768 idx++; // Double takes two cpool slots
1769 break;
1770 }
1771 case JVM_CONSTANT_Class:
1772 case JVM_CONSTANT_UnresolvedClass:
1773 case JVM_CONSTANT_UnresolvedClassInError: {
1774 *bytes = JVM_CONSTANT_Class;
1775 Symbol* sym = klass_name_at(idx);
1776 idx1 = tbl->symbol_to_value(sym);
1777 assert(idx1 != 0, "Have not found a hashtable entry");
1778 Bytes::put_Java_u2((address) (bytes+1), idx1);
1779 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1780 break;
1781 }
1782 case JVM_CONSTANT_String: {
1783 *bytes = JVM_CONSTANT_String;
1784 Symbol* sym = unresolved_string_at(idx);
1785 idx1 = tbl->symbol_to_value(sym);
1786 assert(idx1 != 0, "Have not found a hashtable entry");
1787 Bytes::put_Java_u2((address) (bytes+1), idx1);
1788 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
1789 break;
1790 }
1791 case JVM_CONSTANT_Fieldref:
1792 case JVM_CONSTANT_Methodref:
1793 case JVM_CONSTANT_InterfaceMethodref: {
1794 idx1 = uncached_klass_ref_index_at(idx);
1795 idx2 = uncached_name_and_type_ref_index_at(idx);
1796 Bytes::put_Java_u2((address) (bytes+1), idx1);
1797 Bytes::put_Java_u2((address) (bytes+3), idx2);
1798 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1799 break;
1800 }
1801 case JVM_CONSTANT_NameAndType: {
1802 idx1 = name_ref_index_at(idx);
1803 idx2 = signature_ref_index_at(idx);
1804 Bytes::put_Java_u2((address) (bytes+1), idx1);
1805 Bytes::put_Java_u2((address) (bytes+3), idx2);
1806 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1807 break;
1808 }
1809 case JVM_CONSTANT_ClassIndex: {
1810 *bytes = JVM_CONSTANT_Class;
1811 idx1 = klass_index_at(idx);
1812 Bytes::put_Java_u2((address) (bytes+1), idx1);
1813 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1814 break;
1815 }
1816 case JVM_CONSTANT_StringIndex: {
1817 *bytes = JVM_CONSTANT_String;
1818 idx1 = string_index_at(idx);
1819 Bytes::put_Java_u2((address) (bytes+1), idx1);
1820 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1821 break;
1822 }
1823 case JVM_CONSTANT_MethodHandle:
1824 case JVM_CONSTANT_MethodHandleInError: {
1825 *bytes = JVM_CONSTANT_MethodHandle;
1826 int kind = method_handle_ref_kind_at(idx);
1827 idx1 = method_handle_index_at(idx);
1828 *(bytes+1) = (unsigned char) kind;
1829 Bytes::put_Java_u2((address) (bytes+2), idx1);
1830 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1831 break;
1832 }
1833 case JVM_CONSTANT_MethodType:
1834 case JVM_CONSTANT_MethodTypeInError: {
1835 *bytes = JVM_CONSTANT_MethodType;
1836 idx1 = method_type_index_at(idx);
1837 Bytes::put_Java_u2((address) (bytes+1), idx1);
1838 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1839 break;
1840 }
1841 case JVM_CONSTANT_InvokeDynamic: {
1842 *bytes = tag;
1843 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1844 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1845 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1846 Bytes::put_Java_u2((address) (bytes+1), idx1);
1847 Bytes::put_Java_u2((address) (bytes+3), idx2);
1848 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1849 break;
1850 }
1851 }
1852 DBG(printf("\n"));
1853 bytes += ent_size;
1854 size += ent_size;
1855 }
1856 assert(size == cpool_size, "Size mismatch");
1857
1858 // Keep temorarily for debugging until it's stable.
1859 DBG(print_cpool_bytes(cnt, start_bytes));
1860 return (int)(bytes - start_bytes);
1861 } /* end copy_cpool_bytes */
1862
1863 #undef DBG
1864
1865
1866 void ConstantPool::set_on_stack(const bool value) {
1867 if (value) {
1868 // Only record if it's not already set.
1869 if (!on_stack()) {
1870 assert(!is_shared(), "should always be set for shared constant pools");
1871 _flags |= _on_stack;
1872 MetadataOnStackMark::record(this);
1873 }
1874 } else {
1875 // Clearing is done single-threadedly.
1876 if (!is_shared()) {
1877 _flags &= ~_on_stack;
1878 }
1879 }
1880 }
1881
1882 // JSR 292 support for patching constant pool oops after the class is linked and
1883 // the oop array for resolved references are created.
1884 // We can't do this during classfile parsing, which is how the other indexes are
1885 // patched. The other patches are applied early for some error checking
1886 // so only defer the pseudo_strings.
1887 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
1888 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1889 Handle patch = cp_patches->at(index);
1890 if (patch.not_null()) {
1891 assert (tag_at(index).is_string(), "should only be string left");
1892 // Patching a string means pre-resolving it.
1893 // The spelling in the constant pool is ignored.
1894 // The constant reference may be any object whatever.
1895 // If it is not a real interned string, the constant is referred
1896 // to as a "pseudo-string", and must be presented to the CP
1897 // explicitly, because it may require scavenging.
1898 int obj_index = cp_to_object_index(index);
1899 pseudo_string_at_put(index, obj_index, patch());
1900 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1901 }
1902 }
1903 #ifdef ASSERT
1904 // Ensure that all the patches have been used.
1905 for (int index = 0; index < cp_patches->length(); index++) {
1906 assert(cp_patches->at(index).is_null(),
1907 "Unused constant pool patch at %d in class file %s",
1908 index,
1909 pool_holder()->external_name());
1910 }
1911 #endif // ASSERT
1912 }
1913
1914 #ifndef PRODUCT
1915
1916 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1917 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1918 guarantee(obj->is_constantPool(), "object must be constant pool");
1919 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1920 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1921
1922 for (int i = 0; i< cp->length(); i++) {
1923 if (cp->tag_at(i).is_unresolved_klass()) {
1924 // This will force loading of the class
1925 Klass* klass = cp->klass_at(i, CHECK);
1926 if (klass->is_instance_klass()) {
1927 // Force initialization of class
1928 InstanceKlass::cast(klass)->initialize(CHECK);
1929 }
1930 }
1931 }
1932 }
1933
1934 #endif
1935
1936
1937 // Printing
1938
1939 void ConstantPool::print_on(outputStream* st) const {
1940 assert(is_constantPool(), "must be constantPool");
1941 st->print_cr("%s", internal_name());
1942 if (flags() != 0) {
1943 st->print(" - flags: 0x%x", flags());
1944 if (has_preresolution()) st->print(" has_preresolution");
1945 if (on_stack()) st->print(" on_stack");
1946 st->cr();
1947 }
1948 if (pool_holder() != NULL) {
1949 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
1950 }
1951 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
1952 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
1953 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
1954 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
1955
1956 for (int index = 1; index < length(); index++) { // Index 0 is unused
1957 ((ConstantPool*)this)->print_entry_on(index, st);
1958 switch (tag_at(index).value()) {
1959 case JVM_CONSTANT_Long :
1960 case JVM_CONSTANT_Double :
1961 index++; // Skip entry following eigth-byte constant
1962 }
1963
1964 }
1965 st->cr();
1966 }
1967
1968 // Print one constant pool entry
1969 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1970 EXCEPTION_MARK;
1971 st->print(" - %3d : ", index);
1972 tag_at(index).print_on(st);
1973 st->print(" : ");
1974 switch (tag_at(index).value()) {
1975 case JVM_CONSTANT_Class :
1976 { Klass* k = klass_at(index, CATCH);
1977 guarantee(k != NULL, "need klass");
1978 k->print_value_on(st);
1979 st->print(" {" PTR_FORMAT "}", p2i(k));
1980 }
1981 break;
1982 case JVM_CONSTANT_Fieldref :
1983 case JVM_CONSTANT_Methodref :
1984 case JVM_CONSTANT_InterfaceMethodref :
1985 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1986 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1987 break;
1988 case JVM_CONSTANT_String :
1989 if (is_pseudo_string_at(index)) {
1990 oop anObj = pseudo_string_at(index);
1991 anObj->print_value_on(st);
1992 st->print(" {" PTR_FORMAT "}", p2i(anObj));
1993 } else {
1994 unresolved_string_at(index)->print_value_on(st);
1995 }
1996 break;
1997 case JVM_CONSTANT_Integer :
1998 st->print("%d", int_at(index));
1999 break;
2000 case JVM_CONSTANT_Float :
2001 st->print("%f", float_at(index));
2002 break;
2003 case JVM_CONSTANT_Long :
2004 st->print_jlong(long_at(index));
2005 break;
2006 case JVM_CONSTANT_Double :
2007 st->print("%lf", double_at(index));
2008 break;
2009 case JVM_CONSTANT_NameAndType :
2010 st->print("name_index=%d", name_ref_index_at(index));
2011 st->print(" signature_index=%d", signature_ref_index_at(index));
2012 break;
2013 case JVM_CONSTANT_Utf8 :
2014 symbol_at(index)->print_value_on(st);
2015 break;
2016 case JVM_CONSTANT_ClassIndex: {
2017 int name_index = *int_at_addr(index);
2018 st->print("klass_index=%d ", name_index);
2019 symbol_at(name_index)->print_value_on(st);
2020 }
2021 break;
2022 case JVM_CONSTANT_UnresolvedClass : // fall-through
2023 case JVM_CONSTANT_UnresolvedClassInError: {
2024 CPKlassSlot kslot = klass_slot_at(index);
2025 int resolved_klass_index = kslot.resolved_klass_index();
2026 int name_index = kslot.name_index();
2027 assert(tag_at(name_index).is_symbol(), "sanity");
2028
2029 Klass* klass = resolved_klasses()->at(resolved_klass_index);
2030 if (klass != NULL) {
2031 klass->print_value_on(st);
2032 } else {
2033 symbol_at(name_index)->print_value_on(st);
2034 }
2035 }
2036 break;
2037 case JVM_CONSTANT_MethodHandle :
2038 case JVM_CONSTANT_MethodHandleInError :
2039 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2040 st->print(" ref_index=%d", method_handle_index_at(index));
2041 break;
2042 case JVM_CONSTANT_MethodType :
2043 case JVM_CONSTANT_MethodTypeInError :
2044 st->print("signature_index=%d", method_type_index_at(index));
2045 break;
2046 case JVM_CONSTANT_InvokeDynamic :
2047 {
2048 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
2049 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
2050 int argc = invoke_dynamic_argument_count_at(index);
2051 if (argc > 0) {
2052 for (int arg_i = 0; arg_i < argc; arg_i++) {
2053 int arg = invoke_dynamic_argument_index_at(index, arg_i);
2054 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2055 }
2056 st->print("}");
2057 }
2058 }
2059 break;
2060 default:
2061 ShouldNotReachHere();
2062 break;
2063 }
2064 st->cr();
2065 }
2066
2067 void ConstantPool::print_value_on(outputStream* st) const {
2068 assert(is_constantPool(), "must be constantPool");
2069 st->print("constant pool [%d]", length());
2070 if (has_preresolution()) st->print("/preresolution");
2071 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2072 print_address_on(st);
2073 st->print(" for ");
2074 pool_holder()->print_value_on(st);
2075 if (pool_holder() != NULL) {
2076 bool extra = (pool_holder()->constants() != this);
2077 if (extra) st->print(" (extra)");
2078 }
2079 if (cache() != NULL) {
2080 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2081 }
2082 }
2083
2084 #if INCLUDE_SERVICES
2085 // Size Statistics
2086 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2087 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2088 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2089 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2090 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2091 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2092
2093 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2094 sz->_cp_refmap_bytes;
2095 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2096 }
2097 #endif // INCLUDE_SERVICES
2098
2099 // Verification
2100
2101 void ConstantPool::verify_on(outputStream* st) {
2102 guarantee(is_constantPool(), "object must be constant pool");
2103 for (int i = 0; i< length(); i++) {
2104 constantTag tag = tag_at(i);
2105 if (tag.is_klass() || tag.is_unresolved_klass()) {
2106 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2107 } else if (tag.is_symbol()) {
2108 CPSlot entry = slot_at(i);
2109 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2110 } else if (tag.is_string()) {
2111 CPSlot entry = slot_at(i);
2112 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2113 }
2114 }
2115 if (cache() != NULL) {
2116 // Note: cache() can be NULL before a class is completely setup or
2117 // in temporary constant pools used during constant pool merging
2118 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2119 }
2120 if (pool_holder() != NULL) {
2121 // Note: pool_holder() can be NULL in temporary constant pools
2122 // used during constant pool merging
2123 guarantee(pool_holder()->is_klass(), "should be klass");
2124 }
2125 }
2126
2127
2128 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2129 char *str = sym->as_utf8();
2130 unsigned int hash = compute_hash(str, sym->utf8_length());
2131 unsigned int index = hash % table_size();
2132
2133 // check if already in map
2134 // we prefer the first entry since it is more likely to be what was used in
2135 // the class file
2136 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2137 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2138 if (en->hash() == hash && en->symbol() == sym) {
2139 return; // already there
2140 }
2141 }
2142
2143 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2144 entry->set_next(bucket(index));
2145 _buckets[index].set_entry(entry);
2146 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2147 }
2148
2149 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2150 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2151 char *str = sym->as_utf8();
2152 int len = sym->utf8_length();
2153 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2154 unsigned int index = hash % table_size();
2155 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2156 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2157 if (en->hash() == hash && en->symbol() == sym) {
2158 return en;
2159 }
2160 }
2161 return NULL;
2162 }