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