1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoaderData.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "classfile/metadataOnStackMark.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "interpreter/bootstrapInfo.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/heapInspection.hpp"
37 #include "memory/heapShared.hpp"
38 #include "memory/metadataFactory.hpp"
39 #include "memory/metaspaceClosure.hpp"
40 #include "memory/metaspaceShared.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/array.hpp"
45 #include "oops/constantPool.inline.hpp"
46 #include "oops/cpCache.inline.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/objArrayKlass.hpp"
49 #include "oops/objArrayOop.inline.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "oops/typeArrayOop.inline.hpp"
52 #include "runtime/fieldType.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/init.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/signature.hpp"
57 #include "runtime/thread.inline.hpp"
58 #include "runtime/vframe.inline.hpp"
59 #include "utilities/copy.hpp"
60
61 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
62 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
63 int size = ConstantPool::size(length);
64 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
65 }
66
67 #ifdef ASSERT
68
69 // MetaspaceObj allocation invariant is calloc equivalent memory
70 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
71 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
72 assert(tags != NULL, "invariant");
73 const int length = tags->length();
74 for (int index = 0; index < length; ++index) {
75 if (JVM_CONSTANT_Invalid != tags->at(index)) {
76 return false;
77 }
78 }
79 return true;
80 }
81
82 #endif
83
84 ConstantPool::ConstantPool(Array<u1>* tags) :
85 _tags(tags),
86 _length(tags->length()) {
87
88 assert(_tags != NULL, "invariant");
89 assert(tags->length() == _length, "invariant");
90 assert(tag_array_is_zero_initialized(tags), "invariant");
91 assert(0 == flags(), "invariant");
92 assert(0 == version(), "invariant");
93 assert(NULL == _pool_holder, "invariant");
94 }
95
96 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
97 if (cache() != NULL) {
98 MetadataFactory::free_metadata(loader_data, cache());
99 set_cache(NULL);
100 }
101
102 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
103 set_resolved_klasses(NULL);
104
105 MetadataFactory::free_array<jushort>(loader_data, operands());
106 set_operands(NULL);
107
108 release_C_heap_structures();
109
110 // free tag array
111 MetadataFactory::free_array<u1>(loader_data, tags());
112 set_tags(NULL);
113 }
114
115 void ConstantPool::release_C_heap_structures() {
116 // walk constant pool and decrement symbol reference counts
117 unreference_symbols();
118 }
119
120 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
121 log_trace(cds)("Iter(ConstantPool): %p", this);
122
123 it->push(&_tags, MetaspaceClosure::_writable);
124 it->push(&_cache);
125 it->push(&_pool_holder);
126 it->push(&_operands);
127 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
128
129 for (int i = 0; i < length(); i++) {
130 // The only MSO's embedded in the CP entries are Symbols:
131 // JVM_CONSTANT_String (normal and pseudo)
132 // JVM_CONSTANT_Utf8
133 constantTag ctag = tag_at(i);
134 if (ctag.is_string() || ctag.is_utf8()) {
135 it->push(symbol_at_addr(i));
136 }
137 }
138 }
139
140 objArrayOop ConstantPool::resolved_references() const {
141 return (objArrayOop)_cache->resolved_references();
142 }
143
144 // Called from outside constant pool resolution where a resolved_reference array
145 // may not be present.
146 objArrayOop ConstantPool::resolved_references_or_null() const {
147 if (_cache == NULL) {
148 return NULL;
149 } else {
150 return (objArrayOop)_cache->resolved_references();
151 }
152 }
153
154 // Create resolved_references array and mapping array for original cp indexes
155 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
156 // to map it back for resolving and some unlikely miscellaneous uses.
157 // The objects created by invokedynamic are appended to this list.
158 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
159 const intStack& reference_map,
160 int constant_pool_map_length,
161 TRAPS) {
162 // Initialized the resolved object cache.
163 int map_length = reference_map.length();
164 if (map_length > 0) {
165 // Only need mapping back to constant pool entries. The map isn't used for
166 // invokedynamic resolved_reference entries. For invokedynamic entries,
167 // the constant pool cache index has the mapping back to both the constant
168 // pool and to the resolved reference index.
169 if (constant_pool_map_length > 0) {
170 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
171
172 for (int i = 0; i < constant_pool_map_length; i++) {
173 int x = reference_map.at(i);
174 assert(x == (int)(jushort) x, "klass index is too big");
175 om->at_put(i, (jushort)x);
176 }
177 set_reference_map(om);
178 }
179
180 // Create Java array for holding resolved strings, methodHandles,
181 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
182 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
183 Handle refs_handle (THREAD, (oop)stom); // must handleize.
184 set_resolved_references(loader_data->add_handle(refs_handle));
185 }
186 }
187
188 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
189 // A ConstantPool can't possibly have 0xffff valid class entries,
190 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
191 // entry for the class's name. So at most we will have 0xfffe class entries.
192 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
193 // UnresolvedKlass entries that are temporarily created during class redefinition.
194 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
195 assert(resolved_klasses() == NULL, "sanity");
196 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
197 set_resolved_klasses(rk);
198 }
199
200 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
201 int len = length();
202 int num_klasses = 0;
203 for (int i = 1; i <len; i++) {
204 switch (tag_at(i).value()) {
205 case JVM_CONSTANT_ClassIndex:
206 {
207 const int class_index = klass_index_at(i);
208 unresolved_klass_at_put(i, class_index, num_klasses++);
209 }
210 break;
211 #ifndef PRODUCT
212 case JVM_CONSTANT_Class:
213 case JVM_CONSTANT_UnresolvedClass:
214 case JVM_CONSTANT_UnresolvedClassInError:
215 // All of these should have been reverted back to ClassIndex before calling
216 // this function.
217 ShouldNotReachHere();
218 #endif
219 }
220 }
221 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
222 }
223
224 // Unsafe anonymous class support:
225 void ConstantPool::klass_at_put(int class_index, int name_index, int resolved_klass_index, Klass* k, Symbol* name) {
226 assert(is_within_bounds(class_index), "index out of bounds");
227 assert(is_within_bounds(name_index), "index out of bounds");
228 assert((resolved_klass_index & 0xffff0000) == 0, "must be");
229 *int_at_addr(class_index) =
230 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index);
231
232 symbol_at_put(name_index, name);
233 name->increment_refcount();
234 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
235 Atomic::release_store(adr, k);
236
237 // The interpreter assumes when the tag is stored, the klass is resolved
238 // and the Klass* non-NULL, so we need hardware store ordering here.
239 if (k != NULL) {
240 release_tag_at_put(class_index, JVM_CONSTANT_Class);
241 } else {
242 release_tag_at_put(class_index, JVM_CONSTANT_UnresolvedClass);
243 }
244 }
245
246 // Unsafe anonymous class support:
247 void ConstantPool::klass_at_put(int class_index, Klass* k) {
248 assert(k != NULL, "must be valid klass");
249 CPKlassSlot kslot = klass_slot_at(class_index);
250 int resolved_klass_index = kslot.resolved_klass_index();
251 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
252 Atomic::release_store(adr, k);
253
254 // The interpreter assumes when the tag is stored, the klass is resolved
255 // and the Klass* non-NULL, so we need hardware store ordering here.
256 release_tag_at_put(class_index, JVM_CONSTANT_Class);
257 }
258
259 #if INCLUDE_CDS_JAVA_HEAP
260 // Archive the resolved references
261 void ConstantPool::archive_resolved_references(Thread* THREAD) {
262 if (_cache == NULL) {
263 return; // nothing to do
264 }
265
266 InstanceKlass *ik = pool_holder();
267 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() ||
268 ik->is_shared_app_class())) {
269 // Archiving resolved references for classes from non-builtin loaders
270 // is not yet supported.
271 set_resolved_references(NULL);
272 return;
273 }
274
275 objArrayOop rr = resolved_references();
276 Array<u2>* ref_map = reference_map();
277 if (rr != NULL) {
278 int ref_map_len = ref_map == NULL ? 0 : ref_map->length();
279 int rr_len = rr->length();
280 for (int i = 0; i < rr_len; i++) {
281 oop p = rr->obj_at(i);
282 rr->obj_at_put(i, NULL);
283 if (p != NULL && i < ref_map_len) {
284 int index = object_to_cp_index(i);
285 if (tag_at(index).is_string()) {
286 oop op = StringTable::create_archived_string(p, THREAD);
287 // If the String object is not archived (possibly too large),
288 // NULL is returned. Also set it in the array, so we won't
289 // have a 'bad' reference in the archived resolved_reference
290 // array.
291 rr->obj_at_put(i, op);
292 }
293 }
294 }
295
296 oop archived = HeapShared::archive_heap_object(rr, THREAD);
297 // If the resolved references array is not archived (too large),
298 // the 'archived' object is NULL. No need to explicitly check
299 // the return value of archive_heap_object here. At runtime, the
300 // resolved references will be created using the normal process
301 // when there is no archived value.
302 _cache->set_archived_references(archived);
303 set_resolved_references(NULL);
304 }
305 }
306
307 void ConstantPool::resolve_class_constants(TRAPS) {
308 assert(DumpSharedSpaces, "used during dump time only");
309 // The _cache may be NULL if the _pool_holder klass fails verification
310 // at dump time due to missing dependencies.
311 if (cache() == NULL || reference_map() == NULL) {
312 return; // nothing to do
313 }
314
315 constantPoolHandle cp(THREAD, this);
316 for (int index = 1; index < length(); index++) { // Index 0 is unused
317 if (tag_at(index).is_string() && !cp->is_pseudo_string_at(index)) {
318 int cache_index = cp->cp_to_object_index(index);
319 string_at_impl(cp, index, cache_index, CHECK);
320 }
321 }
322 }
323 #endif
324
325 // CDS support. Create a new resolved_references array.
326 void ConstantPool::restore_unshareable_info(TRAPS) {
327 assert(is_constantPool(), "ensure C++ vtable is restored");
328 assert(on_stack(), "should always be set for shared constant pools");
329 assert(is_shared(), "should always be set for shared constant pools");
330 assert(_cache != NULL, "constant pool _cache should not be NULL");
331
332 // Only create the new resolved references array if it hasn't been attempted before
333 if (resolved_references() != NULL) return;
334
335 // restore the C++ vtable from the shared archive
336 restore_vtable();
337
338 if (SystemDictionary::Object_klass_loaded()) {
339 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
340 #if INCLUDE_CDS_JAVA_HEAP
341 if (HeapShared::open_archive_heap_region_mapped() &&
342 _cache->archived_references() != NULL) {
343 oop archived = _cache->archived_references();
344 // Create handle for the archived resolved reference array object
345 Handle refs_handle(THREAD, archived);
346 set_resolved_references(loader_data->add_handle(refs_handle));
347 } else
348 #endif
349 {
350 // No mapped archived resolved reference array
351 // Recreate the object array and add to ClassLoaderData.
352 int map_length = resolved_reference_length();
353 if (map_length > 0) {
354 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
355 Handle refs_handle(THREAD, (oop)stom); // must handleize.
356 set_resolved_references(loader_data->add_handle(refs_handle));
357 }
358 }
359 }
360 }
361
362 void ConstantPool::remove_unshareable_info() {
363 // Resolved references are not in the shared archive.
364 // Save the length for restoration. It is not necessarily the same length
365 // as reference_map.length() if invokedynamic is saved. It is needed when
366 // re-creating the resolved reference array if archived heap data cannot be map
367 // at runtime.
368 set_resolved_reference_length(
369 resolved_references() != NULL ? resolved_references()->length() : 0);
370
371 // If archiving heap objects is not allowed, clear the resolved references.
372 // Otherwise, it is cleared after the resolved references array is cached
373 // (see archive_resolved_references()).
374 // If DynamicDumpSharedSpaces is enabled, clear the resolved references also
375 // as java objects are not archived in the top layer.
376 if (!HeapShared::is_heap_object_archiving_allowed() || DynamicDumpSharedSpaces) {
377 set_resolved_references(NULL);
378 }
379
380 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
381 // The _on_stack flag is used to prevent ConstantPools from deallocation during
382 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
383 // we always set _on_stack to true to avoid having to change _flags during runtime.
384 _flags |= (_on_stack | _is_shared);
385 int num_klasses = 0;
386 for (int index = 1; index < length(); index++) { // Index 0 is unused
387 if (!DynamicDumpSharedSpaces) {
388 assert(!tag_at(index).is_unresolved_klass_in_error(), "This must not happen during static dump time");
389 } else {
390 if (tag_at(index).is_unresolved_klass_in_error() ||
391 tag_at(index).is_method_handle_in_error() ||
392 tag_at(index).is_method_type_in_error() ||
393 tag_at(index).is_dynamic_constant_in_error()) {
394 tag_at_put(index, JVM_CONSTANT_UnresolvedClass);
395 }
396 }
397 if (tag_at(index).is_klass()) {
398 // This class was resolved as a side effect of executing Java code
399 // during dump time. We need to restore it back to an UnresolvedClass,
400 // so that the proper class loading and initialization can happen
401 // at runtime.
402 CPKlassSlot kslot = klass_slot_at(index);
403 int resolved_klass_index = kslot.resolved_klass_index();
404 int name_index = kslot.name_index();
405 assert(tag_at(name_index).is_symbol(), "sanity");
406 resolved_klasses()->at_put(resolved_klass_index, NULL);
407 tag_at_put(index, JVM_CONSTANT_UnresolvedClass);
408 assert(klass_name_at(index) == symbol_at(name_index), "sanity");
409 }
410 }
411 if (cache() != NULL) {
412 cache()->remove_unshareable_info();
413 }
414 }
415
416 int ConstantPool::cp_to_object_index(int cp_index) {
417 // this is harder don't do this so much.
418 int i = reference_map()->find(cp_index);
419 // We might not find the index for jsr292 call.
420 return (i < 0) ? _no_index_sentinel : i;
421 }
422
423 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
424 resolved_references()->obj_at_put(obj_index, str);
425 }
426
427 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
428 ResourceMark rm;
429 int line_number = -1;
430 const char * source_file = NULL;
431 if (JavaThread::current()->has_last_Java_frame()) {
432 // try to identify the method which called this function.
433 vframeStream vfst(JavaThread::current());
434 if (!vfst.at_end()) {
435 line_number = vfst.method()->line_number_from_bci(vfst.bci());
436 Symbol* s = vfst.method()->method_holder()->source_file_name();
437 if (s != NULL) {
438 source_file = s->as_C_string();
439 }
440 }
441 }
442 if (k != this_cp->pool_holder()) {
443 // only print something if the classes are different
444 if (source_file != NULL) {
445 log_debug(class, resolve)("%s %s %s:%d",
446 this_cp->pool_holder()->external_name(),
447 k->external_name(), source_file, line_number);
448 } else {
449 log_debug(class, resolve)("%s %s",
450 this_cp->pool_holder()->external_name(),
451 k->external_name());
452 }
453 }
454 }
455
456 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
457 bool save_resolution_error, TRAPS) {
458 assert(THREAD->is_Java_thread(), "must be a Java thread");
459 JavaThread* javaThread = (JavaThread*)THREAD;
460
461 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
462 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
463 // the entry and tag is not updated atomicly.
464 CPKlassSlot kslot = this_cp->klass_slot_at(which);
465 int resolved_klass_index = kslot.resolved_klass_index();
466 int name_index = kslot.name_index();
467 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
468
469 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
470 if (klass != NULL) {
471 return klass;
472 }
473
474 // This tag doesn't change back to unresolved class unless at a safepoint.
475 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
476 // The original attempt to resolve this constant pool entry failed so find the
477 // class of the original error and throw another error of the same class
478 // (JVMS 5.4.3).
479 // If there is a detail message, pass that detail message to the error.
480 // The JVMS does not strictly require us to duplicate the same detail message,
481 // or any internal exception fields such as cause or stacktrace. But since the
482 // detail message is often a class name or other literal string, we will repeat it
483 // if we can find it in the symbol table.
484 throw_resolution_error(this_cp, which, CHECK_NULL);
485 ShouldNotReachHere();
486 }
487
488 Handle mirror_handle;
489 Symbol* name = this_cp->symbol_at(name_index);
490 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
491 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
492
493 Klass* k;
494 {
495 // Turn off the single stepping while doing class resolution
496 JvmtiHideSingleStepping jhss(javaThread);
497 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
498 } // JvmtiHideSingleStepping jhss(javaThread);
499
500 if (!HAS_PENDING_EXCEPTION) {
501 // preserve the resolved klass from unloading
502 mirror_handle = Handle(THREAD, k->java_mirror());
503 // Do access check for klasses
504 verify_constant_pool_resolve(this_cp, k, THREAD);
505 }
506
507 // Failed to resolve class. We must record the errors so that subsequent attempts
508 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
509 if (HAS_PENDING_EXCEPTION) {
510 if (save_resolution_error) {
511 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
512 // If CHECK_NULL above doesn't return the exception, that means that
513 // some other thread has beaten us and has resolved the class.
514 // To preserve old behavior, we return the resolved class.
515 klass = this_cp->resolved_klasses()->at(resolved_klass_index);
516 assert(klass != NULL, "must be resolved if exception was cleared");
517 return klass;
518 } else {
519 return NULL; // return the pending exception
520 }
521 }
522
523 // logging for class+resolve.
524 if (log_is_enabled(Debug, class, resolve)){
525 trace_class_resolution(this_cp, k);
526 }
527 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
528 Atomic::release_store(adr, k);
529 // The interpreter assumes when the tag is stored, the klass is resolved
530 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
531 // hardware store ordering here.
532 this_cp->release_tag_at_put(which, JVM_CONSTANT_Class);
533 return k;
534 }
535
536
537 // Does not update ConstantPool* - to avoid any exception throwing. Used
538 // by compiler and exception handling. Also used to avoid classloads for
539 // instanceof operations. Returns NULL if the class has not been loaded or
540 // if the verification of constant pool failed
541 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
542 CPKlassSlot kslot = this_cp->klass_slot_at(which);
543 int resolved_klass_index = kslot.resolved_klass_index();
544 int name_index = kslot.name_index();
545 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
546
547 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
548 if (k != NULL) {
549 return k;
550 } else {
551 Thread *thread = Thread::current();
552 Symbol* name = this_cp->symbol_at(name_index);
553 oop loader = this_cp->pool_holder()->class_loader();
554 oop protection_domain = this_cp->pool_holder()->protection_domain();
555 Handle h_prot (thread, protection_domain);
556 Handle h_loader (thread, loader);
557 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
558
559 // Avoid constant pool verification at a safepoint, which takes the Module_lock.
560 if (k != NULL && !SafepointSynchronize::is_at_safepoint()) {
561 // Make sure that resolving is legal
562 EXCEPTION_MARK;
563 // return NULL if verification fails
564 verify_constant_pool_resolve(this_cp, k, THREAD);
565 if (HAS_PENDING_EXCEPTION) {
566 CLEAR_PENDING_EXCEPTION;
567 return NULL;
568 }
569 return k;
570 } else {
571 return k;
572 }
573 }
574 }
575
576 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
577 int which) {
578 if (cpool->cache() == NULL) return NULL; // nothing to load yet
579 int cache_index = decode_cpcache_index(which, true);
580 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
581 // FIXME: should be an assert
582 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
583 return NULL;
584 }
585 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
586 return e->method_if_resolved(cpool);
587 }
588
589
590 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
591 if (cpool->cache() == NULL) return false; // nothing to load yet
592 int cache_index = decode_cpcache_index(which, true);
593 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
594 return e->has_appendix();
595 }
596
597 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
598 if (cpool->cache() == NULL) return NULL; // nothing to load yet
599 int cache_index = decode_cpcache_index(which, true);
600 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
601 return e->appendix_if_resolved(cpool);
602 }
603
604
605 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) {
606 if (cpool->cache() == NULL) return false; // nothing to load yet
607 int cache_index = decode_cpcache_index(which, true);
608 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
609 return e->has_local_signature();
610 }
611
612 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
613 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
614 return symbol_at(name_index);
615 }
616
617
618 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
619 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
620 return symbol_at(signature_index);
621 }
622
623 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
624 int i = which;
625 if (!uncached && cache() != NULL) {
626 if (ConstantPool::is_invokedynamic_index(which)) {
627 // Invokedynamic index is index into the constant pool cache
628 int pool_index = invokedynamic_bootstrap_ref_index_at(which);
629 pool_index = bootstrap_name_and_type_ref_index_at(pool_index);
630 assert(tag_at(pool_index).is_name_and_type(), "");
631 return pool_index;
632 }
633 // change byte-ordering and go via cache
634 i = remap_instruction_operand_from_cache(which);
635 } else {
636 if (tag_at(which).has_bootstrap()) {
637 int pool_index = bootstrap_name_and_type_ref_index_at(which);
638 assert(tag_at(pool_index).is_name_and_type(), "");
639 return pool_index;
640 }
641 }
642 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
643 assert(!tag_at(i).has_bootstrap(), "Must be handled above");
644 jint ref_index = *int_at_addr(i);
645 return extract_high_short_from_int(ref_index);
646 }
647
648 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
649 int pool_index = which;
650 if (!uncached && cache() != NULL) {
651 if (ConstantPool::is_invokedynamic_index(which)) {
652 // Invokedynamic index is index into resolved_references
653 pool_index = invokedynamic_bootstrap_ref_index_at(which);
654 } else {
655 // change byte-ordering and go via cache
656 pool_index = remap_instruction_operand_from_cache(which);
657 }
658 }
659 return tag_at(pool_index);
660 }
661
662 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
663 guarantee(!ConstantPool::is_invokedynamic_index(which),
664 "an invokedynamic instruction does not have a klass");
665 int i = which;
666 if (!uncached && cache() != NULL) {
667 // change byte-ordering and go via cache
668 i = remap_instruction_operand_from_cache(which);
669 }
670 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
671 jint ref_index = *int_at_addr(i);
672 return extract_low_short_from_int(ref_index);
673 }
674
675
676
677 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
678 int cpc_index = operand;
679 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
680 assert((int)(u2)cpc_index == cpc_index, "clean u2");
681 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
682 return member_index;
683 }
684
685
686 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
687 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
688 return; // short cut, typeArray klass is always accessible
689 }
690 Klass* holder = this_cp->pool_holder();
691 bool fold_type_to_class = true;
692 LinkResolver::check_klass_accessability(holder, k, fold_type_to_class, CHECK);
693 }
694
695
696 int ConstantPool::name_ref_index_at(int which_nt) {
697 jint ref_index = name_and_type_at(which_nt);
698 return extract_low_short_from_int(ref_index);
699 }
700
701
702 int ConstantPool::signature_ref_index_at(int which_nt) {
703 jint ref_index = name_and_type_at(which_nt);
704 return extract_high_short_from_int(ref_index);
705 }
706
707
708 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
709 return klass_at(klass_ref_index_at(which), THREAD);
710 }
711
712 Symbol* ConstantPool::klass_name_at(int which) const {
713 return symbol_at(klass_slot_at(which).name_index());
714 }
715
716 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
717 jint ref_index = klass_ref_index_at(which);
718 return klass_at_noresolve(ref_index);
719 }
720
721 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
722 jint ref_index = uncached_klass_ref_index_at(which);
723 return klass_at_noresolve(ref_index);
724 }
725
726 char* ConstantPool::string_at_noresolve(int which) {
727 return unresolved_string_at(which)->as_C_string();
728 }
729
730 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
731 return FieldType::basic_type(symbol_at(which));
732 }
733
734
735 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
736 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
737 if (this_cp->tag_at(index).is_string()) {
738 this_cp->string_at(index, CHECK);
739 }
740 }
741 }
742
743 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
744 // Dig out the detailed message to reuse if possible
745 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
746 if (message != NULL) {
747 return message;
748 }
749
750 // Return specific message for the tag
751 switch (tag.value()) {
752 case JVM_CONSTANT_UnresolvedClass:
753 // return the class name in the error message
754 message = this_cp->klass_name_at(which);
755 break;
756 case JVM_CONSTANT_MethodHandle:
757 // return the method handle name in the error message
758 message = this_cp->method_handle_name_ref_at(which);
759 break;
760 case JVM_CONSTANT_MethodType:
761 // return the method type signature in the error message
762 message = this_cp->method_type_signature_at(which);
763 break;
764 case JVM_CONSTANT_Dynamic:
765 // return the name of the condy in the error message
766 message = this_cp->uncached_name_ref_at(which);
767 break;
768 default:
769 ShouldNotReachHere();
770 }
771
772 return message;
773 }
774
775 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
776 Symbol* message = NULL;
777 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
778 assert(error != NULL, "checking");
779 CLEAR_PENDING_EXCEPTION;
780 if (message != NULL) {
781 ResourceMark rm;
782 THROW_MSG(error, message->as_C_string());
783 } else {
784 THROW(error);
785 }
786 }
787
788 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
789 // exception in the resolution error table, so that the same exception is thrown again.
790 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
791 constantTag tag, TRAPS) {
792 Symbol* error = PENDING_EXCEPTION->klass()->name();
793
794 int error_tag = tag.error_value();
795
796 if (!PENDING_EXCEPTION->
797 is_a(SystemDictionary::LinkageError_klass())) {
798 // Just throw the exception and don't prevent these classes from
799 // being loaded due to virtual machine errors like StackOverflow
800 // and OutOfMemoryError, etc, or if the thread was hit by stop()
801 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
802 } else if (this_cp->tag_at(which).value() != error_tag) {
803 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
804 SystemDictionary::add_resolution_error(this_cp, which, error, message);
805 // CAS in the tag. If a thread beat us to registering this error that's fine.
806 // If another thread resolved the reference, this is a race condition. This
807 // thread may have had a security manager or something temporary.
808 // This doesn't deterministically get an error. So why do we save this?
809 // We save this because jvmti can add classes to the bootclass path after
810 // this error, so it needs to get the same error if the error is first.
811 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
812 (jbyte)tag.value(),
813 (jbyte)error_tag);
814 if (old_tag != error_tag && old_tag != tag.value()) {
815 // MethodHandles and MethodType doesn't change to resolved version.
816 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
817 // Forget the exception and use the resolved class.
818 CLEAR_PENDING_EXCEPTION;
819 }
820 } else {
821 // some other thread put this in error state
822 throw_resolution_error(this_cp, which, CHECK);
823 }
824 }
825
826 constantTag ConstantPool::constant_tag_at(int which) {
827 constantTag tag = tag_at(which);
828 if (tag.is_dynamic_constant() ||
829 tag.is_dynamic_constant_in_error()) {
830 BasicType bt = basic_type_for_constant_at(which);
831 // dynamic constant could return an array, treat as object
832 return constantTag::ofBasicType(is_reference_type(bt) ? T_OBJECT : bt);
833 }
834 return tag;
835 }
836
837 BasicType ConstantPool::basic_type_for_constant_at(int which) {
838 constantTag tag = tag_at(which);
839 if (tag.is_dynamic_constant() ||
840 tag.is_dynamic_constant_in_error()) {
841 // have to look at the signature for this one
842 Symbol* constant_type = uncached_signature_ref_at(which);
843 return FieldType::basic_type(constant_type);
844 }
845 return tag.basic_type();
846 }
847
848 // Called to resolve constants in the constant pool and return an oop.
849 // Some constant pool entries cache their resolved oop. This is also
850 // called to create oops from constants to use in arguments for invokedynamic
851 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
852 int index, int cache_index,
853 bool* status_return, TRAPS) {
854 oop result_oop = NULL;
855 Handle throw_exception;
856
857 if (cache_index == _possible_index_sentinel) {
858 // It is possible that this constant is one which is cached in the objects.
859 // We'll do a linear search. This should be OK because this usage is rare.
860 // FIXME: If bootstrap specifiers stress this code, consider putting in
861 // a reverse index. Binary search over a short array should do it.
862 assert(index > 0, "valid index");
863 cache_index = this_cp->cp_to_object_index(index);
864 }
865 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
866 assert(index == _no_index_sentinel || index >= 0, "");
867
868 if (cache_index >= 0) {
869 result_oop = this_cp->resolved_references()->obj_at(cache_index);
870 if (result_oop != NULL) {
871 if (result_oop == Universe::the_null_sentinel()) {
872 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index)));
873 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
874 result_oop = NULL;
875 }
876 if (status_return != NULL) (*status_return) = true;
877 return result_oop;
878 // That was easy...
879 }
880 index = this_cp->object_to_cp_index(cache_index);
881 }
882
883 jvalue prim_value; // temp used only in a few cases below
884
885 constantTag tag = this_cp->tag_at(index);
886
887 if (status_return != NULL) {
888 // don't trigger resolution if the constant might need it
889 switch (tag.value()) {
890 case JVM_CONSTANT_Class:
891 {
892 CPKlassSlot kslot = this_cp->klass_slot_at(index);
893 int resolved_klass_index = kslot.resolved_klass_index();
894 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) {
895 (*status_return) = false;
896 return NULL;
897 }
898 // the klass is waiting in the CP; go get it
899 break;
900 }
901 case JVM_CONSTANT_String:
902 case JVM_CONSTANT_Integer:
903 case JVM_CONSTANT_Float:
904 case JVM_CONSTANT_Long:
905 case JVM_CONSTANT_Double:
906 // these guys trigger OOM at worst
907 break;
908 default:
909 (*status_return) = false;
910 return NULL;
911 }
912 // from now on there is either success or an OOME
913 (*status_return) = true;
914 }
915
916 switch (tag.value()) {
917
918 case JVM_CONSTANT_UnresolvedClass:
919 case JVM_CONSTANT_UnresolvedClassInError:
920 case JVM_CONSTANT_Class:
921 {
922 assert(cache_index == _no_index_sentinel, "should not have been set");
923 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
924 // ldc wants the java mirror.
925 result_oop = resolved->java_mirror();
926 break;
927 }
928
929 case JVM_CONSTANT_Dynamic:
930 {
931 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
932 BootstrapInfo bootstrap_specifier(this_cp, index);
933
934 // The initial step in resolving an unresolved symbolic reference to a
935 // dynamically-computed constant is to resolve the symbolic reference to a
936 // method handle which will be the bootstrap method for the dynamically-computed
937 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
938 // method fails, then a MethodHandleInError is stored at the corresponding
939 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
940 // set a DynamicConstantInError here since any subsequent use of this
941 // bootstrap method will encounter the resolution of MethodHandleInError.
942 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
943 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
944 // for the bootstrap_specifier created above.
945 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
946 Exceptions::wrap_dynamic_exception(THREAD);
947 if (HAS_PENDING_EXCEPTION) {
948 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
949 // will check for a LinkageError and store a DynamicConstantInError.
950 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
951 }
952 result_oop = bootstrap_specifier.resolved_value()();
953 BasicType type = FieldType::basic_type(bootstrap_specifier.signature());
954 if (!is_reference_type(type)) {
955 // Make sure the primitive value is properly boxed.
956 // This is a JDK responsibility.
957 const char* fail = NULL;
958 if (result_oop == NULL) {
959 fail = "null result instead of box";
960 } else if (!is_java_primitive(type)) {
961 // FIXME: support value types via unboxing
962 fail = "can only handle references and primitives";
963 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
964 fail = "primitive is not properly boxed";
965 }
966 if (fail != NULL) {
967 // Since this exception is not a LinkageError, throw exception
968 // but do not save a DynamicInError resolution result.
969 // See section 5.4.3 of the VM spec.
970 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
971 }
972 }
973
974 if (TraceMethodHandles) {
975 bootstrap_specifier.print_msg_on(tty, "resolve_constant_at_impl");
976 }
977 break;
978 }
979
980 case JVM_CONSTANT_String:
981 assert(cache_index != _no_index_sentinel, "should have been set");
982 if (this_cp->is_pseudo_string_at(index)) {
983 result_oop = this_cp->pseudo_string_at(index, cache_index);
984 break;
985 }
986 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
987 break;
988
989 case JVM_CONSTANT_DynamicInError:
990 case JVM_CONSTANT_MethodHandleInError:
991 case JVM_CONSTANT_MethodTypeInError:
992 {
993 throw_resolution_error(this_cp, index, CHECK_NULL);
994 break;
995 }
996
997 case JVM_CONSTANT_MethodHandle:
998 {
999 int ref_kind = this_cp->method_handle_ref_kind_at(index);
1000 int callee_index = this_cp->method_handle_klass_index_at(index);
1001 Symbol* name = this_cp->method_handle_name_ref_at(index);
1002 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
1003 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
1004 { ResourceMark rm(THREAD);
1005 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1006 ref_kind, index, this_cp->method_handle_index_at(index),
1007 callee_index, name->as_C_string(), signature->as_C_string());
1008 }
1009
1010 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
1011
1012 // Check constant pool method consistency
1013 if ((callee->is_interface() && m_tag.is_method()) ||
1014 ((!callee->is_interface() && m_tag.is_interface_method()))) {
1015 ResourceMark rm(THREAD);
1016 stringStream ss;
1017 ss.print("Inconsistent constant pool data in classfile for class %s. "
1018 "Method '", callee->name()->as_C_string());
1019 signature->print_as_signature_external_return_type(&ss);
1020 ss.print(" %s(", name->as_C_string());
1021 signature->print_as_signature_external_parameters(&ss);
1022 ss.print(")' at index %d is %s and should be %s",
1023 index,
1024 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1025 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1026 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1027 }
1028
1029 Klass* klass = this_cp->pool_holder();
1030 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1031 callee, name, signature,
1032 THREAD);
1033 result_oop = value();
1034 if (HAS_PENDING_EXCEPTION) {
1035 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1036 }
1037 break;
1038 }
1039
1040 case JVM_CONSTANT_MethodType:
1041 {
1042 Symbol* signature = this_cp->method_type_signature_at(index);
1043 { ResourceMark rm(THREAD);
1044 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1045 index, this_cp->method_type_index_at(index),
1046 signature->as_C_string());
1047 }
1048 Klass* klass = this_cp->pool_holder();
1049 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1050 result_oop = value();
1051 if (HAS_PENDING_EXCEPTION) {
1052 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1053 }
1054 break;
1055 }
1056
1057 case JVM_CONSTANT_Integer:
1058 assert(cache_index == _no_index_sentinel, "should not have been set");
1059 prim_value.i = this_cp->int_at(index);
1060 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1061 break;
1062
1063 case JVM_CONSTANT_Float:
1064 assert(cache_index == _no_index_sentinel, "should not have been set");
1065 prim_value.f = this_cp->float_at(index);
1066 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1067 break;
1068
1069 case JVM_CONSTANT_Long:
1070 assert(cache_index == _no_index_sentinel, "should not have been set");
1071 prim_value.j = this_cp->long_at(index);
1072 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1073 break;
1074
1075 case JVM_CONSTANT_Double:
1076 assert(cache_index == _no_index_sentinel, "should not have been set");
1077 prim_value.d = this_cp->double_at(index);
1078 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1079 break;
1080
1081 default:
1082 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
1083 this_cp(), index, cache_index, tag.value()));
1084 assert(false, "unexpected constant tag");
1085 break;
1086 }
1087
1088 if (cache_index >= 0) {
1089 // Benign race condition: resolved_references may already be filled in.
1090 // The important thing here is that all threads pick up the same result.
1091 // It doesn't matter which racing thread wins, as long as only one
1092 // result is used by all threads, and all future queries.
1093 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop);
1094 oop old_result = this_cp->resolved_references()
1095 ->atomic_compare_exchange_oop(cache_index, new_result, NULL);
1096 if (old_result == NULL) {
1097 return result_oop; // was installed
1098 } else {
1099 // Return the winning thread's result. This can be different than
1100 // the result here for MethodHandles.
1101 if (old_result == Universe::the_null_sentinel())
1102 old_result = NULL;
1103 return old_result;
1104 }
1105 } else {
1106 assert(result_oop != Universe::the_null_sentinel(), "");
1107 return result_oop;
1108 }
1109 }
1110
1111 oop ConstantPool::uncached_string_at(int which, TRAPS) {
1112 Symbol* sym = unresolved_string_at(which);
1113 oop str = StringTable::intern(sym, CHECK_(NULL));
1114 assert(java_lang_String::is_instance(str), "must be string");
1115 return str;
1116 }
1117
1118 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index,
1119 int start_arg, int end_arg,
1120 objArrayHandle info, int pos,
1121 bool must_resolve, Handle if_not_available,
1122 TRAPS) {
1123 int argc;
1124 int limit = pos + end_arg - start_arg;
1125 // checks: index in range [0..this_cp->length),
1126 // tag at index, start..end in range [0..argc],
1127 // info array non-null, pos..limit in [0..info.length]
1128 if ((0 >= index || index >= this_cp->length()) ||
1129 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1130 this_cp->tag_at(index).is_dynamic_constant()) ||
1131 (0 > start_arg || start_arg > end_arg) ||
1132 (end_arg > (argc = this_cp->bootstrap_argument_count_at(index))) ||
1133 (0 > pos || pos > limit) ||
1134 (info.is_null() || limit > info->length())) {
1135 // An index or something else went wrong; throw an error.
1136 // Since this is an internal API, we don't expect this,
1137 // so we don't bother to craft a nice message.
1138 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1139 }
1140 // now we can loop safely
1141 int info_i = pos;
1142 for (int i = start_arg; i < end_arg; i++) {
1143 int arg_index = this_cp->bootstrap_argument_index_at(index, i);
1144 oop arg_oop;
1145 if (must_resolve) {
1146 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1147 } else {
1148 bool found_it = false;
1149 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1150 if (!found_it) arg_oop = if_not_available();
1151 }
1152 info->obj_at_put(info_i++, arg_oop);
1153 }
1154 }
1155
1156 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1157 // If the string has already been interned, this entry will be non-null
1158 oop str = this_cp->resolved_references()->obj_at(obj_index);
1159 assert(str != Universe::the_null_sentinel(), "");
1160 if (str != NULL) return str;
1161 Symbol* sym = this_cp->unresolved_string_at(which);
1162 str = StringTable::intern(sym, CHECK_(NULL));
1163 this_cp->string_at_put(which, obj_index, str);
1164 assert(java_lang_String::is_instance(str), "must be string");
1165 return str;
1166 }
1167
1168
1169 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1170 // Names are interned, so we can compare Symbol*s directly
1171 Symbol* cp_name = klass_name_at(which);
1172 return (cp_name == k->name());
1173 }
1174
1175
1176 // Iterate over symbols and decrement ones which are Symbol*s
1177 // This is done during GC.
1178 // Only decrement the UTF8 symbols. Strings point to
1179 // these symbols but didn't increment the reference count.
1180 void ConstantPool::unreference_symbols() {
1181 for (int index = 1; index < length(); index++) { // Index 0 is unused
1182 constantTag tag = tag_at(index);
1183 if (tag.is_symbol()) {
1184 symbol_at(index)->decrement_refcount();
1185 }
1186 }
1187 }
1188
1189
1190 // Compare this constant pool's entry at index1 to the constant pool
1191 // cp2's entry at index2.
1192 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1193 int index2, TRAPS) {
1194
1195 // The error tags are equivalent to non-error tags when comparing
1196 jbyte t1 = tag_at(index1).non_error_value();
1197 jbyte t2 = cp2->tag_at(index2).non_error_value();
1198
1199 if (t1 != t2) {
1200 // Not the same entry type so there is nothing else to check. Note
1201 // that this style of checking will consider resolved/unresolved
1202 // class pairs as different.
1203 // From the ConstantPool* API point of view, this is correct
1204 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1205 // plays out in the context of ConstantPool* merging.
1206 return false;
1207 }
1208
1209 switch (t1) {
1210 case JVM_CONSTANT_Class:
1211 {
1212 Klass* k1 = klass_at(index1, CHECK_false);
1213 Klass* k2 = cp2->klass_at(index2, CHECK_false);
1214 if (k1 == k2) {
1215 return true;
1216 }
1217 } break;
1218
1219 case JVM_CONSTANT_ClassIndex:
1220 {
1221 int recur1 = klass_index_at(index1);
1222 int recur2 = cp2->klass_index_at(index2);
1223 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1224 if (match) {
1225 return true;
1226 }
1227 } break;
1228
1229 case JVM_CONSTANT_Double:
1230 {
1231 jdouble d1 = double_at(index1);
1232 jdouble d2 = cp2->double_at(index2);
1233 if (d1 == d2) {
1234 return true;
1235 }
1236 } break;
1237
1238 case JVM_CONSTANT_Fieldref:
1239 case JVM_CONSTANT_InterfaceMethodref:
1240 case JVM_CONSTANT_Methodref:
1241 {
1242 int recur1 = uncached_klass_ref_index_at(index1);
1243 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1244 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1245 if (match) {
1246 recur1 = uncached_name_and_type_ref_index_at(index1);
1247 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1248 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1249 if (match) {
1250 return true;
1251 }
1252 }
1253 } break;
1254
1255 case JVM_CONSTANT_Float:
1256 {
1257 jfloat f1 = float_at(index1);
1258 jfloat f2 = cp2->float_at(index2);
1259 if (f1 == f2) {
1260 return true;
1261 }
1262 } break;
1263
1264 case JVM_CONSTANT_Integer:
1265 {
1266 jint i1 = int_at(index1);
1267 jint i2 = cp2->int_at(index2);
1268 if (i1 == i2) {
1269 return true;
1270 }
1271 } break;
1272
1273 case JVM_CONSTANT_Long:
1274 {
1275 jlong l1 = long_at(index1);
1276 jlong l2 = cp2->long_at(index2);
1277 if (l1 == l2) {
1278 return true;
1279 }
1280 } break;
1281
1282 case JVM_CONSTANT_NameAndType:
1283 {
1284 int recur1 = name_ref_index_at(index1);
1285 int recur2 = cp2->name_ref_index_at(index2);
1286 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1287 if (match) {
1288 recur1 = signature_ref_index_at(index1);
1289 recur2 = cp2->signature_ref_index_at(index2);
1290 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1291 if (match) {
1292 return true;
1293 }
1294 }
1295 } break;
1296
1297 case JVM_CONSTANT_StringIndex:
1298 {
1299 int recur1 = string_index_at(index1);
1300 int recur2 = cp2->string_index_at(index2);
1301 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1302 if (match) {
1303 return true;
1304 }
1305 } break;
1306
1307 case JVM_CONSTANT_UnresolvedClass:
1308 {
1309 Symbol* k1 = klass_name_at(index1);
1310 Symbol* k2 = cp2->klass_name_at(index2);
1311 if (k1 == k2) {
1312 return true;
1313 }
1314 } break;
1315
1316 case JVM_CONSTANT_MethodType:
1317 {
1318 int k1 = method_type_index_at(index1);
1319 int k2 = cp2->method_type_index_at(index2);
1320 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1321 if (match) {
1322 return true;
1323 }
1324 } break;
1325
1326 case JVM_CONSTANT_MethodHandle:
1327 {
1328 int k1 = method_handle_ref_kind_at(index1);
1329 int k2 = cp2->method_handle_ref_kind_at(index2);
1330 if (k1 == k2) {
1331 int i1 = method_handle_index_at(index1);
1332 int i2 = cp2->method_handle_index_at(index2);
1333 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1334 if (match) {
1335 return true;
1336 }
1337 }
1338 } break;
1339
1340 case JVM_CONSTANT_Dynamic:
1341 {
1342 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1343 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1344 int i1 = bootstrap_methods_attribute_index(index1);
1345 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1346 // separate statements and variables because CHECK_false is used
1347 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1348 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1349 return (match_entry && match_operand);
1350 } break;
1351
1352 case JVM_CONSTANT_InvokeDynamic:
1353 {
1354 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1355 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1356 int i1 = bootstrap_methods_attribute_index(index1);
1357 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1358 // separate statements and variables because CHECK_false is used
1359 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1360 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1361 return (match_entry && match_operand);
1362 } break;
1363
1364 case JVM_CONSTANT_String:
1365 {
1366 Symbol* s1 = unresolved_string_at(index1);
1367 Symbol* s2 = cp2->unresolved_string_at(index2);
1368 if (s1 == s2) {
1369 return true;
1370 }
1371 } break;
1372
1373 case JVM_CONSTANT_Utf8:
1374 {
1375 Symbol* s1 = symbol_at(index1);
1376 Symbol* s2 = cp2->symbol_at(index2);
1377 if (s1 == s2) {
1378 return true;
1379 }
1380 } break;
1381
1382 // Invalid is used as the tag for the second constant pool entry
1383 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1384 // not be seen by itself.
1385 case JVM_CONSTANT_Invalid: // fall through
1386
1387 default:
1388 ShouldNotReachHere();
1389 break;
1390 }
1391
1392 return false;
1393 } // end compare_entry_to()
1394
1395
1396 // Resize the operands array with delta_len and delta_size.
1397 // Used in RedefineClasses for CP merge.
1398 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1399 int old_len = operand_array_length(operands());
1400 int new_len = old_len + delta_len;
1401 int min_len = (delta_len > 0) ? old_len : new_len;
1402
1403 int old_size = operands()->length();
1404 int new_size = old_size + delta_size;
1405 int min_size = (delta_size > 0) ? old_size : new_size;
1406
1407 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1408 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1409
1410 // Set index in the resized array for existing elements only
1411 for (int idx = 0; idx < min_len; idx++) {
1412 int offset = operand_offset_at(idx); // offset in original array
1413 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1414 }
1415 // Copy the bootstrap specifiers only
1416 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1417 new_ops->adr_at(2*new_len),
1418 (min_size - 2*min_len) * sizeof(u2));
1419 // Explicitly deallocate old operands array.
1420 // Note, it is not needed for 7u backport.
1421 if ( operands() != NULL) { // the safety check
1422 MetadataFactory::free_array<u2>(loader_data, operands());
1423 }
1424 set_operands(new_ops);
1425 } // end resize_operands()
1426
1427
1428 // Extend the operands array with the length and size of the ext_cp operands.
1429 // Used in RedefineClasses for CP merge.
1430 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1431 int delta_len = operand_array_length(ext_cp->operands());
1432 if (delta_len == 0) {
1433 return; // nothing to do
1434 }
1435 int delta_size = ext_cp->operands()->length();
1436
1437 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1438
1439 if (operand_array_length(operands()) == 0) {
1440 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1441 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1442 // The first element index defines the offset of second part
1443 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1444 set_operands(new_ops);
1445 } else {
1446 resize_operands(delta_len, delta_size, CHECK);
1447 }
1448
1449 } // end extend_operands()
1450
1451
1452 // Shrink the operands array to a smaller array with new_len length.
1453 // Used in RedefineClasses for CP merge.
1454 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1455 int old_len = operand_array_length(operands());
1456 if (new_len == old_len) {
1457 return; // nothing to do
1458 }
1459 assert(new_len < old_len, "shrunken operands array must be smaller");
1460
1461 int free_base = operand_next_offset_at(new_len - 1);
1462 int delta_len = new_len - old_len;
1463 int delta_size = 2*delta_len + free_base - operands()->length();
1464
1465 resize_operands(delta_len, delta_size, CHECK);
1466
1467 } // end shrink_operands()
1468
1469
1470 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1471 const constantPoolHandle& to_cp,
1472 TRAPS) {
1473
1474 int from_oplen = operand_array_length(from_cp->operands());
1475 int old_oplen = operand_array_length(to_cp->operands());
1476 if (from_oplen != 0) {
1477 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1478 // append my operands to the target's operands array
1479 if (old_oplen == 0) {
1480 // Can't just reuse from_cp's operand list because of deallocation issues
1481 int len = from_cp->operands()->length();
1482 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1483 Copy::conjoint_memory_atomic(
1484 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1485 to_cp->set_operands(new_ops);
1486 } else {
1487 int old_len = to_cp->operands()->length();
1488 int from_len = from_cp->operands()->length();
1489 int old_off = old_oplen * sizeof(u2);
1490 int from_off = from_oplen * sizeof(u2);
1491 // Use the metaspace for the destination constant pool
1492 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1493 int fillp = 0, len = 0;
1494 // first part of dest
1495 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1496 new_operands->adr_at(fillp),
1497 (len = old_off) * sizeof(u2));
1498 fillp += len;
1499 // first part of src
1500 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1501 new_operands->adr_at(fillp),
1502 (len = from_off) * sizeof(u2));
1503 fillp += len;
1504 // second part of dest
1505 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1506 new_operands->adr_at(fillp),
1507 (len = old_len - old_off) * sizeof(u2));
1508 fillp += len;
1509 // second part of src
1510 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1511 new_operands->adr_at(fillp),
1512 (len = from_len - from_off) * sizeof(u2));
1513 fillp += len;
1514 assert(fillp == new_operands->length(), "");
1515
1516 // Adjust indexes in the first part of the copied operands array.
1517 for (int j = 0; j < from_oplen; j++) {
1518 int offset = operand_offset_at(new_operands, old_oplen + j);
1519 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1520 offset += old_len; // every new tuple is preceded by old_len extra u2's
1521 operand_offset_at_put(new_operands, old_oplen + j, offset);
1522 }
1523
1524 // replace target operands array with combined array
1525 to_cp->set_operands(new_operands);
1526 }
1527 }
1528 } // end copy_operands()
1529
1530
1531 // Copy this constant pool's entries at start_i to end_i (inclusive)
1532 // to the constant pool to_cp's entries starting at to_i. A total of
1533 // (end_i - start_i) + 1 entries are copied.
1534 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1535 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1536
1537
1538 int dest_i = to_i; // leave original alone for debug purposes
1539
1540 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1541 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1542
1543 switch (from_cp->tag_at(src_i).value()) {
1544 case JVM_CONSTANT_Double:
1545 case JVM_CONSTANT_Long:
1546 // double and long take two constant pool entries
1547 src_i += 2;
1548 dest_i += 2;
1549 break;
1550
1551 default:
1552 // all others take one constant pool entry
1553 src_i++;
1554 dest_i++;
1555 break;
1556 }
1557 }
1558 copy_operands(from_cp, to_cp, CHECK);
1559
1560 } // end copy_cp_to_impl()
1561
1562
1563 // Copy this constant pool's entry at from_i to the constant pool
1564 // to_cp's entry at to_i.
1565 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1566 const constantPoolHandle& to_cp, int to_i,
1567 TRAPS) {
1568
1569 int tag = from_cp->tag_at(from_i).value();
1570 switch (tag) {
1571 case JVM_CONSTANT_ClassIndex:
1572 {
1573 jint ki = from_cp->klass_index_at(from_i);
1574 to_cp->klass_index_at_put(to_i, ki);
1575 } break;
1576
1577 case JVM_CONSTANT_Double:
1578 {
1579 jdouble d = from_cp->double_at(from_i);
1580 to_cp->double_at_put(to_i, d);
1581 // double takes two constant pool entries so init second entry's tag
1582 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1583 } break;
1584
1585 case JVM_CONSTANT_Fieldref:
1586 {
1587 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1588 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1589 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1590 } break;
1591
1592 case JVM_CONSTANT_Float:
1593 {
1594 jfloat f = from_cp->float_at(from_i);
1595 to_cp->float_at_put(to_i, f);
1596 } break;
1597
1598 case JVM_CONSTANT_Integer:
1599 {
1600 jint i = from_cp->int_at(from_i);
1601 to_cp->int_at_put(to_i, i);
1602 } break;
1603
1604 case JVM_CONSTANT_InterfaceMethodref:
1605 {
1606 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1607 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1608 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1609 } break;
1610
1611 case JVM_CONSTANT_Long:
1612 {
1613 jlong l = from_cp->long_at(from_i);
1614 to_cp->long_at_put(to_i, l);
1615 // long takes two constant pool entries so init second entry's tag
1616 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1617 } break;
1618
1619 case JVM_CONSTANT_Methodref:
1620 {
1621 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1622 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1623 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1624 } break;
1625
1626 case JVM_CONSTANT_NameAndType:
1627 {
1628 int name_ref_index = from_cp->name_ref_index_at(from_i);
1629 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1630 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1631 } break;
1632
1633 case JVM_CONSTANT_StringIndex:
1634 {
1635 jint si = from_cp->string_index_at(from_i);
1636 to_cp->string_index_at_put(to_i, si);
1637 } break;
1638
1639 case JVM_CONSTANT_Class:
1640 case JVM_CONSTANT_UnresolvedClass:
1641 case JVM_CONSTANT_UnresolvedClassInError:
1642 {
1643 // Revert to JVM_CONSTANT_ClassIndex
1644 int name_index = from_cp->klass_slot_at(from_i).name_index();
1645 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1646 to_cp->klass_index_at_put(to_i, name_index);
1647 } break;
1648
1649 case JVM_CONSTANT_String:
1650 {
1651 Symbol* s = from_cp->unresolved_string_at(from_i);
1652 to_cp->unresolved_string_at_put(to_i, s);
1653 } break;
1654
1655 case JVM_CONSTANT_Utf8:
1656 {
1657 Symbol* s = from_cp->symbol_at(from_i);
1658 // Need to increase refcount, the old one will be thrown away and deferenced
1659 s->increment_refcount();
1660 to_cp->symbol_at_put(to_i, s);
1661 } break;
1662
1663 case JVM_CONSTANT_MethodType:
1664 case JVM_CONSTANT_MethodTypeInError:
1665 {
1666 jint k = from_cp->method_type_index_at(from_i);
1667 to_cp->method_type_index_at_put(to_i, k);
1668 } break;
1669
1670 case JVM_CONSTANT_MethodHandle:
1671 case JVM_CONSTANT_MethodHandleInError:
1672 {
1673 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1674 int k2 = from_cp->method_handle_index_at(from_i);
1675 to_cp->method_handle_index_at_put(to_i, k1, k2);
1676 } break;
1677
1678 case JVM_CONSTANT_Dynamic:
1679 case JVM_CONSTANT_DynamicInError:
1680 {
1681 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1682 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1683 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1684 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1685 } break;
1686
1687 case JVM_CONSTANT_InvokeDynamic:
1688 {
1689 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1690 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1691 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1692 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1693 } break;
1694
1695 // Invalid is used as the tag for the second constant pool entry
1696 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1697 // not be seen by itself.
1698 case JVM_CONSTANT_Invalid: // fall through
1699
1700 default:
1701 {
1702 ShouldNotReachHere();
1703 } break;
1704 }
1705 } // end copy_entry_to()
1706
1707 // Search constant pool search_cp for an entry that matches this
1708 // constant pool's entry at pattern_i. Returns the index of a
1709 // matching entry or zero (0) if there is no matching entry.
1710 int ConstantPool::find_matching_entry(int pattern_i,
1711 const constantPoolHandle& search_cp, TRAPS) {
1712
1713 // index zero (0) is not used
1714 for (int i = 1; i < search_cp->length(); i++) {
1715 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1716 if (found) {
1717 return i;
1718 }
1719 }
1720
1721 return 0; // entry not found; return unused index zero (0)
1722 } // end find_matching_entry()
1723
1724
1725 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1726 // cp2's bootstrap specifier at idx2.
1727 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1728 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1729 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1730 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1731
1732 if (!match) {
1733 return false;
1734 }
1735 int argc = operand_argument_count_at(idx1);
1736 if (argc == cp2->operand_argument_count_at(idx2)) {
1737 for (int j = 0; j < argc; j++) {
1738 k1 = operand_argument_index_at(idx1, j);
1739 k2 = cp2->operand_argument_index_at(idx2, j);
1740 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1741 if (!match) {
1742 return false;
1743 }
1744 }
1745 return true; // got through loop; all elements equal
1746 }
1747 return false;
1748 } // end compare_operand_to()
1749
1750 // Search constant pool search_cp for a bootstrap specifier that matches
1751 // this constant pool's bootstrap specifier data at pattern_i index.
1752 // Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1753 int ConstantPool::find_matching_operand(int pattern_i,
1754 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1755 for (int i = 0; i < search_len; i++) {
1756 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1757 if (found) {
1758 return i;
1759 }
1760 }
1761 return -1; // bootstrap specifier data not found; return unused index (-1)
1762 } // end find_matching_operand()
1763
1764
1765 #ifndef PRODUCT
1766
1767 const char* ConstantPool::printable_name_at(int which) {
1768
1769 constantTag tag = tag_at(which);
1770
1771 if (tag.is_string()) {
1772 return string_at_noresolve(which);
1773 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1774 return klass_name_at(which)->as_C_string();
1775 } else if (tag.is_symbol()) {
1776 return symbol_at(which)->as_C_string();
1777 }
1778 return "";
1779 }
1780
1781 #endif // PRODUCT
1782
1783
1784 // JVMTI GetConstantPool support
1785
1786 // For debugging of constant pool
1787 const bool debug_cpool = false;
1788
1789 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1790
1791 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1792 const char* WARN_MSG = "Must not be such entry!";
1793 jint size = 0;
1794 u2 idx1, idx2;
1795
1796 for (jint idx = 1; idx < cnt; idx++) {
1797 jint ent_size = 0;
1798 u1 tag = *bytes++;
1799 size++; // count tag
1800
1801 printf("const #%03d, tag: %02d ", idx, tag);
1802 switch(tag) {
1803 case JVM_CONSTANT_Invalid: {
1804 printf("Invalid");
1805 break;
1806 }
1807 case JVM_CONSTANT_Unicode: {
1808 printf("Unicode %s", WARN_MSG);
1809 break;
1810 }
1811 case JVM_CONSTANT_Utf8: {
1812 u2 len = Bytes::get_Java_u2(bytes);
1813 char str[128];
1814 if (len > 127) {
1815 len = 127;
1816 }
1817 strncpy(str, (char *) (bytes+2), len);
1818 str[len] = '\0';
1819 printf("Utf8 \"%s\"", str);
1820 ent_size = 2 + len;
1821 break;
1822 }
1823 case JVM_CONSTANT_Integer: {
1824 u4 val = Bytes::get_Java_u4(bytes);
1825 printf("int %d", *(int *) &val);
1826 ent_size = 4;
1827 break;
1828 }
1829 case JVM_CONSTANT_Float: {
1830 u4 val = Bytes::get_Java_u4(bytes);
1831 printf("float %5.3ff", *(float *) &val);
1832 ent_size = 4;
1833 break;
1834 }
1835 case JVM_CONSTANT_Long: {
1836 u8 val = Bytes::get_Java_u8(bytes);
1837 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1838 ent_size = 8;
1839 idx++; // Long takes two cpool slots
1840 break;
1841 }
1842 case JVM_CONSTANT_Double: {
1843 u8 val = Bytes::get_Java_u8(bytes);
1844 printf("double %5.3fd", *(jdouble *)&val);
1845 ent_size = 8;
1846 idx++; // Double takes two cpool slots
1847 break;
1848 }
1849 case JVM_CONSTANT_Class: {
1850 idx1 = Bytes::get_Java_u2(bytes);
1851 printf("class #%03d", idx1);
1852 ent_size = 2;
1853 break;
1854 }
1855 case JVM_CONSTANT_String: {
1856 idx1 = Bytes::get_Java_u2(bytes);
1857 printf("String #%03d", idx1);
1858 ent_size = 2;
1859 break;
1860 }
1861 case JVM_CONSTANT_Fieldref: {
1862 idx1 = Bytes::get_Java_u2(bytes);
1863 idx2 = Bytes::get_Java_u2(bytes+2);
1864 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1865 ent_size = 4;
1866 break;
1867 }
1868 case JVM_CONSTANT_Methodref: {
1869 idx1 = Bytes::get_Java_u2(bytes);
1870 idx2 = Bytes::get_Java_u2(bytes+2);
1871 printf("Method #%03d, #%03d", idx1, idx2);
1872 ent_size = 4;
1873 break;
1874 }
1875 case JVM_CONSTANT_InterfaceMethodref: {
1876 idx1 = Bytes::get_Java_u2(bytes);
1877 idx2 = Bytes::get_Java_u2(bytes+2);
1878 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1879 ent_size = 4;
1880 break;
1881 }
1882 case JVM_CONSTANT_NameAndType: {
1883 idx1 = Bytes::get_Java_u2(bytes);
1884 idx2 = Bytes::get_Java_u2(bytes+2);
1885 printf("NameAndType #%03d, #%03d", idx1, idx2);
1886 ent_size = 4;
1887 break;
1888 }
1889 case JVM_CONSTANT_ClassIndex: {
1890 printf("ClassIndex %s", WARN_MSG);
1891 break;
1892 }
1893 case JVM_CONSTANT_UnresolvedClass: {
1894 printf("UnresolvedClass: %s", WARN_MSG);
1895 break;
1896 }
1897 case JVM_CONSTANT_UnresolvedClassInError: {
1898 printf("UnresolvedClassInErr: %s", WARN_MSG);
1899 break;
1900 }
1901 case JVM_CONSTANT_StringIndex: {
1902 printf("StringIndex: %s", WARN_MSG);
1903 break;
1904 }
1905 }
1906 printf(";\n");
1907 bytes += ent_size;
1908 size += ent_size;
1909 }
1910 printf("Cpool size: %d\n", size);
1911 fflush(0);
1912 return;
1913 } /* end print_cpool_bytes */
1914
1915
1916 // Returns size of constant pool entry.
1917 jint ConstantPool::cpool_entry_size(jint idx) {
1918 switch(tag_at(idx).value()) {
1919 case JVM_CONSTANT_Invalid:
1920 case JVM_CONSTANT_Unicode:
1921 return 1;
1922
1923 case JVM_CONSTANT_Utf8:
1924 return 3 + symbol_at(idx)->utf8_length();
1925
1926 case JVM_CONSTANT_Class:
1927 case JVM_CONSTANT_String:
1928 case JVM_CONSTANT_ClassIndex:
1929 case JVM_CONSTANT_UnresolvedClass:
1930 case JVM_CONSTANT_UnresolvedClassInError:
1931 case JVM_CONSTANT_StringIndex:
1932 case JVM_CONSTANT_MethodType:
1933 case JVM_CONSTANT_MethodTypeInError:
1934 return 3;
1935
1936 case JVM_CONSTANT_MethodHandle:
1937 case JVM_CONSTANT_MethodHandleInError:
1938 return 4; //tag, ref_kind, ref_index
1939
1940 case JVM_CONSTANT_Integer:
1941 case JVM_CONSTANT_Float:
1942 case JVM_CONSTANT_Fieldref:
1943 case JVM_CONSTANT_Methodref:
1944 case JVM_CONSTANT_InterfaceMethodref:
1945 case JVM_CONSTANT_NameAndType:
1946 return 5;
1947
1948 case JVM_CONSTANT_Dynamic:
1949 case JVM_CONSTANT_DynamicInError:
1950 case JVM_CONSTANT_InvokeDynamic:
1951 // u1 tag, u2 bsm, u2 nt
1952 return 5;
1953
1954 case JVM_CONSTANT_Long:
1955 case JVM_CONSTANT_Double:
1956 return 9;
1957 }
1958 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1959 return 1;
1960 } /* end cpool_entry_size */
1961
1962
1963 // SymbolHashMap is used to find a constant pool index from a string.
1964 // This function fills in SymbolHashMaps, one for utf8s and one for
1965 // class names, returns size of the cpool raw bytes.
1966 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1967 SymbolHashMap *classmap) {
1968 jint size = 0;
1969
1970 for (u2 idx = 1; idx < length(); idx++) {
1971 u2 tag = tag_at(idx).value();
1972 size += cpool_entry_size(idx);
1973
1974 switch(tag) {
1975 case JVM_CONSTANT_Utf8: {
1976 Symbol* sym = symbol_at(idx);
1977 symmap->add_entry(sym, idx);
1978 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1979 break;
1980 }
1981 case JVM_CONSTANT_Class:
1982 case JVM_CONSTANT_UnresolvedClass:
1983 case JVM_CONSTANT_UnresolvedClassInError: {
1984 Symbol* sym = klass_name_at(idx);
1985 classmap->add_entry(sym, idx);
1986 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1987 break;
1988 }
1989 case JVM_CONSTANT_Long:
1990 case JVM_CONSTANT_Double: {
1991 idx++; // Both Long and Double take two cpool slots
1992 break;
1993 }
1994 }
1995 }
1996 return size;
1997 } /* end hash_utf8_entries_to */
1998
1999
2000 // Copy cpool bytes.
2001 // Returns:
2002 // 0, in case of OutOfMemoryError
2003 // -1, in case of internal error
2004 // > 0, count of the raw cpool bytes that have been copied
2005 int ConstantPool::copy_cpool_bytes(int cpool_size,
2006 SymbolHashMap* tbl,
2007 unsigned char *bytes) {
2008 u2 idx1, idx2;
2009 jint size = 0;
2010 jint cnt = length();
2011 unsigned char *start_bytes = bytes;
2012
2013 for (jint idx = 1; idx < cnt; idx++) {
2014 u1 tag = tag_at(idx).value();
2015 jint ent_size = cpool_entry_size(idx);
2016
2017 assert(size + ent_size <= cpool_size, "Size mismatch");
2018
2019 *bytes = tag;
2020 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2021 switch(tag) {
2022 case JVM_CONSTANT_Invalid: {
2023 DBG(printf("JVM_CONSTANT_Invalid"));
2024 break;
2025 }
2026 case JVM_CONSTANT_Unicode: {
2027 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2028 DBG(printf("JVM_CONSTANT_Unicode"));
2029 break;
2030 }
2031 case JVM_CONSTANT_Utf8: {
2032 Symbol* sym = symbol_at(idx);
2033 char* str = sym->as_utf8();
2034 // Warning! It's crashing on x86 with len = sym->utf8_length()
2035 int len = (int) strlen(str);
2036 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2037 for (int i = 0; i < len; i++) {
2038 bytes[3+i] = (u1) str[i];
2039 }
2040 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2041 break;
2042 }
2043 case JVM_CONSTANT_Integer: {
2044 jint val = int_at(idx);
2045 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2046 break;
2047 }
2048 case JVM_CONSTANT_Float: {
2049 jfloat val = float_at(idx);
2050 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2051 break;
2052 }
2053 case JVM_CONSTANT_Long: {
2054 jlong val = long_at(idx);
2055 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2056 idx++; // Long takes two cpool slots
2057 break;
2058 }
2059 case JVM_CONSTANT_Double: {
2060 jdouble val = double_at(idx);
2061 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2062 idx++; // Double takes two cpool slots
2063 break;
2064 }
2065 case JVM_CONSTANT_Class:
2066 case JVM_CONSTANT_UnresolvedClass:
2067 case JVM_CONSTANT_UnresolvedClassInError: {
2068 *bytes = JVM_CONSTANT_Class;
2069 Symbol* sym = klass_name_at(idx);
2070 idx1 = tbl->symbol_to_value(sym);
2071 assert(idx1 != 0, "Have not found a hashtable entry");
2072 Bytes::put_Java_u2((address) (bytes+1), idx1);
2073 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2074 break;
2075 }
2076 case JVM_CONSTANT_String: {
2077 *bytes = JVM_CONSTANT_String;
2078 Symbol* sym = unresolved_string_at(idx);
2079 idx1 = tbl->symbol_to_value(sym);
2080 assert(idx1 != 0, "Have not found a hashtable entry");
2081 Bytes::put_Java_u2((address) (bytes+1), idx1);
2082 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2083 break;
2084 }
2085 case JVM_CONSTANT_Fieldref:
2086 case JVM_CONSTANT_Methodref:
2087 case JVM_CONSTANT_InterfaceMethodref: {
2088 idx1 = uncached_klass_ref_index_at(idx);
2089 idx2 = uncached_name_and_type_ref_index_at(idx);
2090 Bytes::put_Java_u2((address) (bytes+1), idx1);
2091 Bytes::put_Java_u2((address) (bytes+3), idx2);
2092 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2093 break;
2094 }
2095 case JVM_CONSTANT_NameAndType: {
2096 idx1 = name_ref_index_at(idx);
2097 idx2 = signature_ref_index_at(idx);
2098 Bytes::put_Java_u2((address) (bytes+1), idx1);
2099 Bytes::put_Java_u2((address) (bytes+3), idx2);
2100 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2101 break;
2102 }
2103 case JVM_CONSTANT_ClassIndex: {
2104 *bytes = JVM_CONSTANT_Class;
2105 idx1 = klass_index_at(idx);
2106 Bytes::put_Java_u2((address) (bytes+1), idx1);
2107 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2108 break;
2109 }
2110 case JVM_CONSTANT_StringIndex: {
2111 *bytes = JVM_CONSTANT_String;
2112 idx1 = string_index_at(idx);
2113 Bytes::put_Java_u2((address) (bytes+1), idx1);
2114 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2115 break;
2116 }
2117 case JVM_CONSTANT_MethodHandle:
2118 case JVM_CONSTANT_MethodHandleInError: {
2119 *bytes = JVM_CONSTANT_MethodHandle;
2120 int kind = method_handle_ref_kind_at(idx);
2121 idx1 = method_handle_index_at(idx);
2122 *(bytes+1) = (unsigned char) kind;
2123 Bytes::put_Java_u2((address) (bytes+2), idx1);
2124 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2125 break;
2126 }
2127 case JVM_CONSTANT_MethodType:
2128 case JVM_CONSTANT_MethodTypeInError: {
2129 *bytes = JVM_CONSTANT_MethodType;
2130 idx1 = method_type_index_at(idx);
2131 Bytes::put_Java_u2((address) (bytes+1), idx1);
2132 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2133 break;
2134 }
2135 case JVM_CONSTANT_Dynamic:
2136 case JVM_CONSTANT_DynamicInError: {
2137 *bytes = tag;
2138 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2139 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2140 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2141 Bytes::put_Java_u2((address) (bytes+1), idx1);
2142 Bytes::put_Java_u2((address) (bytes+3), idx2);
2143 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2144 break;
2145 }
2146 case JVM_CONSTANT_InvokeDynamic: {
2147 *bytes = tag;
2148 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2149 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2150 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2151 Bytes::put_Java_u2((address) (bytes+1), idx1);
2152 Bytes::put_Java_u2((address) (bytes+3), idx2);
2153 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2154 break;
2155 }
2156 }
2157 DBG(printf("\n"));
2158 bytes += ent_size;
2159 size += ent_size;
2160 }
2161 assert(size == cpool_size, "Size mismatch");
2162
2163 // Keep temorarily for debugging until it's stable.
2164 DBG(print_cpool_bytes(cnt, start_bytes));
2165 return (int)(bytes - start_bytes);
2166 } /* end copy_cpool_bytes */
2167
2168 #undef DBG
2169
2170
2171 void ConstantPool::set_on_stack(const bool value) {
2172 if (value) {
2173 // Only record if it's not already set.
2174 if (!on_stack()) {
2175 assert(!is_shared(), "should always be set for shared constant pools");
2176 _flags |= _on_stack;
2177 MetadataOnStackMark::record(this);
2178 }
2179 } else {
2180 // Clearing is done single-threadedly.
2181 if (!is_shared()) {
2182 _flags &= ~_on_stack;
2183 }
2184 }
2185 }
2186
2187 // JSR 292 support for patching constant pool oops after the class is linked and
2188 // the oop array for resolved references are created.
2189 // We can't do this during classfile parsing, which is how the other indexes are
2190 // patched. The other patches are applied early for some error checking
2191 // so only defer the pseudo_strings.
2192 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
2193 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
2194 Handle patch = cp_patches->at(index);
2195 if (patch.not_null()) {
2196 assert (tag_at(index).is_string(), "should only be string left");
2197 // Patching a string means pre-resolving it.
2198 // The spelling in the constant pool is ignored.
2199 // The constant reference may be any object whatever.
2200 // If it is not a real interned string, the constant is referred
2201 // to as a "pseudo-string", and must be presented to the CP
2202 // explicitly, because it may require scavenging.
2203 int obj_index = cp_to_object_index(index);
2204 pseudo_string_at_put(index, obj_index, patch());
2205 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
2206 }
2207 }
2208 #ifdef ASSERT
2209 // Ensure that all the patches have been used.
2210 for (int index = 0; index < cp_patches->length(); index++) {
2211 assert(cp_patches->at(index).is_null(),
2212 "Unused constant pool patch at %d in class file %s",
2213 index,
2214 pool_holder()->external_name());
2215 }
2216 #endif // ASSERT
2217 }
2218
2219 // Printing
2220
2221 void ConstantPool::print_on(outputStream* st) const {
2222 assert(is_constantPool(), "must be constantPool");
2223 st->print_cr("%s", internal_name());
2224 if (flags() != 0) {
2225 st->print(" - flags: 0x%x", flags());
2226 if (has_preresolution()) st->print(" has_preresolution");
2227 if (on_stack()) st->print(" on_stack");
2228 st->cr();
2229 }
2230 if (pool_holder() != NULL) {
2231 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
2232 }
2233 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
2234 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
2235 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
2236 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
2237
2238 for (int index = 1; index < length(); index++) { // Index 0 is unused
2239 ((ConstantPool*)this)->print_entry_on(index, st);
2240 switch (tag_at(index).value()) {
2241 case JVM_CONSTANT_Long :
2242 case JVM_CONSTANT_Double :
2243 index++; // Skip entry following eigth-byte constant
2244 }
2245
2246 }
2247 st->cr();
2248 }
2249
2250 // Print one constant pool entry
2251 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2252 EXCEPTION_MARK;
2253 st->print(" - %3d : ", index);
2254 tag_at(index).print_on(st);
2255 st->print(" : ");
2256 switch (tag_at(index).value()) {
2257 case JVM_CONSTANT_Class :
2258 { Klass* k = klass_at(index, CATCH);
2259 guarantee(k != NULL, "need klass");
2260 k->print_value_on(st);
2261 st->print(" {" PTR_FORMAT "}", p2i(k));
2262 }
2263 break;
2264 case JVM_CONSTANT_Fieldref :
2265 case JVM_CONSTANT_Methodref :
2266 case JVM_CONSTANT_InterfaceMethodref :
2267 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2268 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2269 break;
2270 case JVM_CONSTANT_String :
2271 if (is_pseudo_string_at(index)) {
2272 oop anObj = pseudo_string_at(index);
2273 anObj->print_value_on(st);
2274 st->print(" {" PTR_FORMAT "}", p2i(anObj));
2275 } else {
2276 unresolved_string_at(index)->print_value_on(st);
2277 }
2278 break;
2279 case JVM_CONSTANT_Integer :
2280 st->print("%d", int_at(index));
2281 break;
2282 case JVM_CONSTANT_Float :
2283 st->print("%f", float_at(index));
2284 break;
2285 case JVM_CONSTANT_Long :
2286 st->print_jlong(long_at(index));
2287 break;
2288 case JVM_CONSTANT_Double :
2289 st->print("%lf", double_at(index));
2290 break;
2291 case JVM_CONSTANT_NameAndType :
2292 st->print("name_index=%d", name_ref_index_at(index));
2293 st->print(" signature_index=%d", signature_ref_index_at(index));
2294 break;
2295 case JVM_CONSTANT_Utf8 :
2296 symbol_at(index)->print_value_on(st);
2297 break;
2298 case JVM_CONSTANT_ClassIndex: {
2299 int name_index = *int_at_addr(index);
2300 st->print("klass_index=%d ", name_index);
2301 symbol_at(name_index)->print_value_on(st);
2302 }
2303 break;
2304 case JVM_CONSTANT_UnresolvedClass : // fall-through
2305 case JVM_CONSTANT_UnresolvedClassInError: {
2306 CPKlassSlot kslot = klass_slot_at(index);
2307 int resolved_klass_index = kslot.resolved_klass_index();
2308 int name_index = kslot.name_index();
2309 assert(tag_at(name_index).is_symbol(), "sanity");
2310
2311 Klass* klass = resolved_klasses()->at(resolved_klass_index);
2312 if (klass != NULL) {
2313 klass->print_value_on(st);
2314 } else {
2315 symbol_at(name_index)->print_value_on(st);
2316 }
2317 }
2318 break;
2319 case JVM_CONSTANT_MethodHandle :
2320 case JVM_CONSTANT_MethodHandleInError :
2321 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2322 st->print(" ref_index=%d", method_handle_index_at(index));
2323 break;
2324 case JVM_CONSTANT_MethodType :
2325 case JVM_CONSTANT_MethodTypeInError :
2326 st->print("signature_index=%d", method_type_index_at(index));
2327 break;
2328 case JVM_CONSTANT_Dynamic :
2329 case JVM_CONSTANT_DynamicInError :
2330 {
2331 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2332 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2333 int argc = bootstrap_argument_count_at(index);
2334 if (argc > 0) {
2335 for (int arg_i = 0; arg_i < argc; arg_i++) {
2336 int arg = bootstrap_argument_index_at(index, arg_i);
2337 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2338 }
2339 st->print("}");
2340 }
2341 }
2342 break;
2343 case JVM_CONSTANT_InvokeDynamic :
2344 {
2345 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2346 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2347 int argc = bootstrap_argument_count_at(index);
2348 if (argc > 0) {
2349 for (int arg_i = 0; arg_i < argc; arg_i++) {
2350 int arg = bootstrap_argument_index_at(index, arg_i);
2351 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2352 }
2353 st->print("}");
2354 }
2355 }
2356 break;
2357 default:
2358 ShouldNotReachHere();
2359 break;
2360 }
2361 st->cr();
2362 }
2363
2364 void ConstantPool::print_value_on(outputStream* st) const {
2365 assert(is_constantPool(), "must be constantPool");
2366 st->print("constant pool [%d]", length());
2367 if (has_preresolution()) st->print("/preresolution");
2368 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2369 print_address_on(st);
2370 if (pool_holder() != NULL) {
2371 st->print(" for ");
2372 pool_holder()->print_value_on(st);
2373 bool extra = (pool_holder()->constants() != this);
2374 if (extra) st->print(" (extra)");
2375 }
2376 if (cache() != NULL) {
2377 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2378 }
2379 }
2380
2381 #if INCLUDE_SERVICES
2382 // Size Statistics
2383 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2384 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2385 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2386 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2387 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2388 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2389
2390 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2391 sz->_cp_refmap_bytes;
2392 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2393 }
2394 #endif // INCLUDE_SERVICES
2395
2396 // Verification
2397
2398 void ConstantPool::verify_on(outputStream* st) {
2399 guarantee(is_constantPool(), "object must be constant pool");
2400 for (int i = 0; i< length(); i++) {
2401 constantTag tag = tag_at(i);
2402 if (tag.is_klass() || tag.is_unresolved_klass()) {
2403 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2404 } else if (tag.is_symbol()) {
2405 CPSlot entry = slot_at(i);
2406 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2407 } else if (tag.is_string()) {
2408 CPSlot entry = slot_at(i);
2409 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2410 }
2411 }
2412 if (pool_holder() != NULL) {
2413 // Note: pool_holder() can be NULL in temporary constant pools
2414 // used during constant pool merging
2415 guarantee(pool_holder()->is_klass(), "should be klass");
2416 }
2417 }
2418
2419
2420 SymbolHashMap::~SymbolHashMap() {
2421 SymbolHashMapEntry* next;
2422 for (int i = 0; i < _table_size; i++) {
2423 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
2424 next = cur->next();
2425 delete(cur);
2426 }
2427 }
2428 FREE_C_HEAP_ARRAY(SymbolHashMapBucket, _buckets);
2429 }
2430
2431 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2432 char *str = sym->as_utf8();
2433 unsigned int hash = compute_hash(str, sym->utf8_length());
2434 unsigned int index = hash % table_size();
2435
2436 // check if already in map
2437 // we prefer the first entry since it is more likely to be what was used in
2438 // the class file
2439 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2440 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2441 if (en->hash() == hash && en->symbol() == sym) {
2442 return; // already there
2443 }
2444 }
2445
2446 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2447 entry->set_next(bucket(index));
2448 _buckets[index].set_entry(entry);
2449 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2450 }
2451
2452 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2453 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2454 char *str = sym->as_utf8();
2455 int len = sym->utf8_length();
2456 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2457 unsigned int index = hash % table_size();
2458 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2459 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2460 if (en->hash() == hash && en->symbol() == sym) {
2461 return en;
2462 }
2463 }
2464 return NULL;
2465 }
2466
2467 void SymbolHashMap::initialize_table(int table_size) {
2468 _table_size = table_size;
2469 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
2470 for (int index = 0; index < table_size; index++) {
2471 _buckets[index].clear();
2472 }
2473 }