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