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)error_tag,
812 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value());
813 if (old_tag != error_tag && old_tag != tag.value()) {
814 // MethodHandles and MethodType doesn't change to resolved version.
815 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
816 // Forget the exception and use the resolved class.
817 CLEAR_PENDING_EXCEPTION;
818 }
819 } else {
820 // some other thread put this in error state
821 throw_resolution_error(this_cp, which, CHECK);
822 }
823 }
824
825 constantTag ConstantPool::constant_tag_at(int which) {
826 constantTag tag = tag_at(which);
827 if (tag.is_dynamic_constant() ||
828 tag.is_dynamic_constant_in_error()) {
829 BasicType bt = basic_type_for_constant_at(which);
830 // dynamic constant could return an array, treat as object
831 return constantTag::ofBasicType(is_reference_type(bt) ? T_OBJECT : bt);
832 }
833 return tag;
834 }
835
836 BasicType ConstantPool::basic_type_for_constant_at(int which) {
837 constantTag tag = tag_at(which);
838 if (tag.is_dynamic_constant() ||
839 tag.is_dynamic_constant_in_error()) {
840 // have to look at the signature for this one
841 Symbol* constant_type = uncached_signature_ref_at(which);
842 return FieldType::basic_type(constant_type);
843 }
844 return tag.basic_type();
845 }
846
847 // Called to resolve constants in the constant pool and return an oop.
848 // Some constant pool entries cache their resolved oop. This is also
849 // called to create oops from constants to use in arguments for invokedynamic
850 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
851 int index, int cache_index,
852 bool* status_return, TRAPS) {
853 oop result_oop = NULL;
854 Handle throw_exception;
855
856 if (cache_index == _possible_index_sentinel) {
857 // It is possible that this constant is one which is cached in the objects.
858 // We'll do a linear search. This should be OK because this usage is rare.
859 // FIXME: If bootstrap specifiers stress this code, consider putting in
860 // a reverse index. Binary search over a short array should do it.
861 assert(index > 0, "valid index");
862 cache_index = this_cp->cp_to_object_index(index);
863 }
864 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
865 assert(index == _no_index_sentinel || index >= 0, "");
866
867 if (cache_index >= 0) {
868 result_oop = this_cp->resolved_references()->obj_at(cache_index);
869 if (result_oop != NULL) {
870 if (result_oop == Universe::the_null_sentinel()) {
871 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index)));
872 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
873 result_oop = NULL;
874 }
875 if (status_return != NULL) (*status_return) = true;
876 return result_oop;
877 // That was easy...
878 }
879 index = this_cp->object_to_cp_index(cache_index);
880 }
881
882 jvalue prim_value; // temp used only in a few cases below
883
884 constantTag tag = this_cp->tag_at(index);
885
886 if (status_return != NULL) {
887 // don't trigger resolution if the constant might need it
888 switch (tag.value()) {
889 case JVM_CONSTANT_Class:
890 {
891 CPKlassSlot kslot = this_cp->klass_slot_at(index);
892 int resolved_klass_index = kslot.resolved_klass_index();
893 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) {
894 (*status_return) = false;
895 return NULL;
896 }
897 // the klass is waiting in the CP; go get it
898 break;
899 }
900 case JVM_CONSTANT_String:
901 case JVM_CONSTANT_Integer:
902 case JVM_CONSTANT_Float:
903 case JVM_CONSTANT_Long:
904 case JVM_CONSTANT_Double:
905 // these guys trigger OOM at worst
906 break;
907 default:
908 (*status_return) = false;
909 return NULL;
910 }
911 // from now on there is either success or an OOME
912 (*status_return) = true;
913 }
914
915 switch (tag.value()) {
916
917 case JVM_CONSTANT_UnresolvedClass:
918 case JVM_CONSTANT_UnresolvedClassInError:
919 case JVM_CONSTANT_Class:
920 {
921 assert(cache_index == _no_index_sentinel, "should not have been set");
922 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
923 // ldc wants the java mirror.
924 result_oop = resolved->java_mirror();
925 break;
926 }
927
928 case JVM_CONSTANT_Dynamic:
929 {
930 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
931 BootstrapInfo bootstrap_specifier(this_cp, index);
932
933 // The initial step in resolving an unresolved symbolic reference to a
934 // dynamically-computed constant is to resolve the symbolic reference to a
935 // method handle which will be the bootstrap method for the dynamically-computed
936 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
937 // method fails, then a MethodHandleInError is stored at the corresponding
938 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
939 // set a DynamicConstantInError here since any subsequent use of this
940 // bootstrap method will encounter the resolution of MethodHandleInError.
941 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
942 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
943 // for the bootstrap_specifier created above.
944 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
945 Exceptions::wrap_dynamic_exception(THREAD);
946 if (HAS_PENDING_EXCEPTION) {
947 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
948 // will check for a LinkageError and store a DynamicConstantInError.
949 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
950 }
951 result_oop = bootstrap_specifier.resolved_value()();
952 BasicType type = FieldType::basic_type(bootstrap_specifier.signature());
953 if (!is_reference_type(type)) {
954 // Make sure the primitive value is properly boxed.
955 // This is a JDK responsibility.
956 const char* fail = NULL;
957 if (result_oop == NULL) {
958 fail = "null result instead of box";
959 } else if (!is_java_primitive(type)) {
960 // FIXME: support value types via unboxing
961 fail = "can only handle references and primitives";
962 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
963 fail = "primitive is not properly boxed";
964 }
965 if (fail != NULL) {
966 // Since this exception is not a LinkageError, throw exception
967 // but do not save a DynamicInError resolution result.
968 // See section 5.4.3 of the VM spec.
969 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
970 }
971 }
972
973 if (TraceMethodHandles) {
974 bootstrap_specifier.print_msg_on(tty, "resolve_constant_at_impl");
975 }
976 break;
977 }
978
979 case JVM_CONSTANT_String:
980 assert(cache_index != _no_index_sentinel, "should have been set");
981 if (this_cp->is_pseudo_string_at(index)) {
982 result_oop = this_cp->pseudo_string_at(index, cache_index);
983 break;
984 }
985 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
986 break;
987
988 case JVM_CONSTANT_DynamicInError:
989 case JVM_CONSTANT_MethodHandleInError:
990 case JVM_CONSTANT_MethodTypeInError:
991 {
992 throw_resolution_error(this_cp, index, CHECK_NULL);
993 break;
994 }
995
996 case JVM_CONSTANT_MethodHandle:
997 {
998 int ref_kind = this_cp->method_handle_ref_kind_at(index);
999 int callee_index = this_cp->method_handle_klass_index_at(index);
1000 Symbol* name = this_cp->method_handle_name_ref_at(index);
1001 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
1002 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
1003 { ResourceMark rm(THREAD);
1004 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1005 ref_kind, index, this_cp->method_handle_index_at(index),
1006 callee_index, name->as_C_string(), signature->as_C_string());
1007 }
1008
1009 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
1010
1011 // Check constant pool method consistency
1012 if ((callee->is_interface() && m_tag.is_method()) ||
1013 ((!callee->is_interface() && m_tag.is_interface_method()))) {
1014 ResourceMark rm(THREAD);
1015 stringStream ss;
1016 ss.print("Inconsistent constant pool data in classfile for class %s. "
1017 "Method '", callee->name()->as_C_string());
1018 signature->print_as_signature_external_return_type(&ss);
1019 ss.print(" %s(", name->as_C_string());
1020 signature->print_as_signature_external_parameters(&ss);
1021 ss.print(")' at index %d is %s and should be %s",
1022 index,
1023 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1024 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1025 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1026 }
1027
1028 Klass* klass = this_cp->pool_holder();
1029 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1030 callee, name, signature,
1031 THREAD);
1032 result_oop = value();
1033 if (HAS_PENDING_EXCEPTION) {
1034 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1035 }
1036 break;
1037 }
1038
1039 case JVM_CONSTANT_MethodType:
1040 {
1041 Symbol* signature = this_cp->method_type_signature_at(index);
1042 { ResourceMark rm(THREAD);
1043 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1044 index, this_cp->method_type_index_at(index),
1045 signature->as_C_string());
1046 }
1047 Klass* klass = this_cp->pool_holder();
1048 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1049 result_oop = value();
1050 if (HAS_PENDING_EXCEPTION) {
1051 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1052 }
1053 break;
1054 }
1055
1056 case JVM_CONSTANT_Integer:
1057 assert(cache_index == _no_index_sentinel, "should not have been set");
1058 prim_value.i = this_cp->int_at(index);
1059 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1060 break;
1061
1062 case JVM_CONSTANT_Float:
1063 assert(cache_index == _no_index_sentinel, "should not have been set");
1064 prim_value.f = this_cp->float_at(index);
1065 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1066 break;
1067
1068 case JVM_CONSTANT_Long:
1069 assert(cache_index == _no_index_sentinel, "should not have been set");
1070 prim_value.j = this_cp->long_at(index);
1071 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1072 break;
1073
1074 case JVM_CONSTANT_Double:
1075 assert(cache_index == _no_index_sentinel, "should not have been set");
1076 prim_value.d = this_cp->double_at(index);
1077 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1078 break;
1079
1080 default:
1081 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
1082 this_cp(), index, cache_index, tag.value()));
1083 assert(false, "unexpected constant tag");
1084 break;
1085 }
1086
1087 if (cache_index >= 0) {
1088 // Benign race condition: resolved_references may already be filled in.
1089 // The important thing here is that all threads pick up the same result.
1090 // It doesn't matter which racing thread wins, as long as only one
1091 // result is used by all threads, and all future queries.
1092 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop);
1093 oop old_result = this_cp->resolved_references()
1094 ->atomic_compare_exchange_oop(cache_index, new_result, NULL);
1095 if (old_result == NULL) {
1096 return result_oop; // was installed
1097 } else {
1098 // Return the winning thread's result. This can be different than
1099 // the result here for MethodHandles.
1100 if (old_result == Universe::the_null_sentinel())
1101 old_result = NULL;
1102 return old_result;
1103 }
1104 } else {
1105 assert(result_oop != Universe::the_null_sentinel(), "");
1106 return result_oop;
1107 }
1108 }
1109
1110 oop ConstantPool::uncached_string_at(int which, TRAPS) {
1111 Symbol* sym = unresolved_string_at(which);
1112 oop str = StringTable::intern(sym, CHECK_(NULL));
1113 assert(java_lang_String::is_instance(str), "must be string");
1114 return str;
1115 }
1116
1117 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index,
1118 int start_arg, int end_arg,
1119 objArrayHandle info, int pos,
1120 bool must_resolve, Handle if_not_available,
1121 TRAPS) {
1122 int argc;
1123 int limit = pos + end_arg - start_arg;
1124 // checks: index in range [0..this_cp->length),
1125 // tag at index, start..end in range [0..argc],
1126 // info array non-null, pos..limit in [0..info.length]
1127 if ((0 >= index || index >= this_cp->length()) ||
1128 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1129 this_cp->tag_at(index).is_dynamic_constant()) ||
1130 (0 > start_arg || start_arg > end_arg) ||
1131 (end_arg > (argc = this_cp->bootstrap_argument_count_at(index))) ||
1132 (0 > pos || pos > limit) ||
1133 (info.is_null() || limit > info->length())) {
1134 // An index or something else went wrong; throw an error.
1135 // Since this is an internal API, we don't expect this,
1136 // so we don't bother to craft a nice message.
1137 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1138 }
1139 // now we can loop safely
1140 int info_i = pos;
1141 for (int i = start_arg; i < end_arg; i++) {
1142 int arg_index = this_cp->bootstrap_argument_index_at(index, i);
1143 oop arg_oop;
1144 if (must_resolve) {
1145 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1146 } else {
1147 bool found_it = false;
1148 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1149 if (!found_it) arg_oop = if_not_available();
1150 }
1151 info->obj_at_put(info_i++, arg_oop);
1152 }
1153 }
1154
1155 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1156 // If the string has already been interned, this entry will be non-null
1157 oop str = this_cp->resolved_references()->obj_at(obj_index);
1158 assert(str != Universe::the_null_sentinel(), "");
1159 if (str != NULL) return str;
1160 Symbol* sym = this_cp->unresolved_string_at(which);
1161 str = StringTable::intern(sym, CHECK_(NULL));
1162 this_cp->string_at_put(which, obj_index, str);
1163 assert(java_lang_String::is_instance(str), "must be string");
1164 return str;
1165 }
1166
1167
1168 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1169 // Names are interned, so we can compare Symbol*s directly
1170 Symbol* cp_name = klass_name_at(which);
1171 return (cp_name == k->name());
1172 }
1173
1174
1175 // Iterate over symbols and decrement ones which are Symbol*s
1176 // This is done during GC.
1177 // Only decrement the UTF8 symbols. Strings point to
1178 // these symbols but didn't increment the reference count.
1179 void ConstantPool::unreference_symbols() {
1180 for (int index = 1; index < length(); index++) { // Index 0 is unused
1181 constantTag tag = tag_at(index);
1182 if (tag.is_symbol()) {
1183 symbol_at(index)->decrement_refcount();
1184 }
1185 }
1186 }
1187
1188
1189 // Compare this constant pool's entry at index1 to the constant pool
1190 // cp2's entry at index2.
1191 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1192 int index2, TRAPS) {
1193
1194 // The error tags are equivalent to non-error tags when comparing
1195 jbyte t1 = tag_at(index1).non_error_value();
1196 jbyte t2 = cp2->tag_at(index2).non_error_value();
1197
1198 if (t1 != t2) {
1199 // Not the same entry type so there is nothing else to check. Note
1200 // that this style of checking will consider resolved/unresolved
1201 // class pairs as different.
1202 // From the ConstantPool* API point of view, this is correct
1203 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1204 // plays out in the context of ConstantPool* merging.
1205 return false;
1206 }
1207
1208 switch (t1) {
1209 case JVM_CONSTANT_Class:
1210 {
1211 Klass* k1 = klass_at(index1, CHECK_false);
1212 Klass* k2 = cp2->klass_at(index2, CHECK_false);
1213 if (k1 == k2) {
1214 return true;
1215 }
1216 } break;
1217
1218 case JVM_CONSTANT_ClassIndex:
1219 {
1220 int recur1 = klass_index_at(index1);
1221 int recur2 = cp2->klass_index_at(index2);
1222 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1223 if (match) {
1224 return true;
1225 }
1226 } break;
1227
1228 case JVM_CONSTANT_Double:
1229 {
1230 jdouble d1 = double_at(index1);
1231 jdouble d2 = cp2->double_at(index2);
1232 if (d1 == d2) {
1233 return true;
1234 }
1235 } break;
1236
1237 case JVM_CONSTANT_Fieldref:
1238 case JVM_CONSTANT_InterfaceMethodref:
1239 case JVM_CONSTANT_Methodref:
1240 {
1241 int recur1 = uncached_klass_ref_index_at(index1);
1242 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1243 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1244 if (match) {
1245 recur1 = uncached_name_and_type_ref_index_at(index1);
1246 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1247 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1248 if (match) {
1249 return true;
1250 }
1251 }
1252 } break;
1253
1254 case JVM_CONSTANT_Float:
1255 {
1256 jfloat f1 = float_at(index1);
1257 jfloat f2 = cp2->float_at(index2);
1258 if (f1 == f2) {
1259 return true;
1260 }
1261 } break;
1262
1263 case JVM_CONSTANT_Integer:
1264 {
1265 jint i1 = int_at(index1);
1266 jint i2 = cp2->int_at(index2);
1267 if (i1 == i2) {
1268 return true;
1269 }
1270 } break;
1271
1272 case JVM_CONSTANT_Long:
1273 {
1274 jlong l1 = long_at(index1);
1275 jlong l2 = cp2->long_at(index2);
1276 if (l1 == l2) {
1277 return true;
1278 }
1279 } break;
1280
1281 case JVM_CONSTANT_NameAndType:
1282 {
1283 int recur1 = name_ref_index_at(index1);
1284 int recur2 = cp2->name_ref_index_at(index2);
1285 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1286 if (match) {
1287 recur1 = signature_ref_index_at(index1);
1288 recur2 = cp2->signature_ref_index_at(index2);
1289 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1290 if (match) {
1291 return true;
1292 }
1293 }
1294 } break;
1295
1296 case JVM_CONSTANT_StringIndex:
1297 {
1298 int recur1 = string_index_at(index1);
1299 int recur2 = cp2->string_index_at(index2);
1300 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1301 if (match) {
1302 return true;
1303 }
1304 } break;
1305
1306 case JVM_CONSTANT_UnresolvedClass:
1307 {
1308 Symbol* k1 = klass_name_at(index1);
1309 Symbol* k2 = cp2->klass_name_at(index2);
1310 if (k1 == k2) {
1311 return true;
1312 }
1313 } break;
1314
1315 case JVM_CONSTANT_MethodType:
1316 {
1317 int k1 = method_type_index_at(index1);
1318 int k2 = cp2->method_type_index_at(index2);
1319 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1320 if (match) {
1321 return true;
1322 }
1323 } break;
1324
1325 case JVM_CONSTANT_MethodHandle:
1326 {
1327 int k1 = method_handle_ref_kind_at(index1);
1328 int k2 = cp2->method_handle_ref_kind_at(index2);
1329 if (k1 == k2) {
1330 int i1 = method_handle_index_at(index1);
1331 int i2 = cp2->method_handle_index_at(index2);
1332 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1333 if (match) {
1334 return true;
1335 }
1336 }
1337 } break;
1338
1339 case JVM_CONSTANT_Dynamic:
1340 {
1341 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1342 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1343 int i1 = bootstrap_methods_attribute_index(index1);
1344 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1345 // separate statements and variables because CHECK_false is used
1346 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1347 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1348 return (match_entry && match_operand);
1349 } break;
1350
1351 case JVM_CONSTANT_InvokeDynamic:
1352 {
1353 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1354 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1355 int i1 = bootstrap_methods_attribute_index(index1);
1356 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1357 // separate statements and variables because CHECK_false is used
1358 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1359 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1360 return (match_entry && match_operand);
1361 } break;
1362
1363 case JVM_CONSTANT_String:
1364 {
1365 Symbol* s1 = unresolved_string_at(index1);
1366 Symbol* s2 = cp2->unresolved_string_at(index2);
1367 if (s1 == s2) {
1368 return true;
1369 }
1370 } break;
1371
1372 case JVM_CONSTANT_Utf8:
1373 {
1374 Symbol* s1 = symbol_at(index1);
1375 Symbol* s2 = cp2->symbol_at(index2);
1376 if (s1 == s2) {
1377 return true;
1378 }
1379 } break;
1380
1381 // Invalid is used as the tag for the second constant pool entry
1382 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1383 // not be seen by itself.
1384 case JVM_CONSTANT_Invalid: // fall through
1385
1386 default:
1387 ShouldNotReachHere();
1388 break;
1389 }
1390
1391 return false;
1392 } // end compare_entry_to()
1393
1394
1395 // Resize the operands array with delta_len and delta_size.
1396 // Used in RedefineClasses for CP merge.
1397 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1398 int old_len = operand_array_length(operands());
1399 int new_len = old_len + delta_len;
1400 int min_len = (delta_len > 0) ? old_len : new_len;
1401
1402 int old_size = operands()->length();
1403 int new_size = old_size + delta_size;
1404 int min_size = (delta_size > 0) ? old_size : new_size;
1405
1406 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1407 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1408
1409 // Set index in the resized array for existing elements only
1410 for (int idx = 0; idx < min_len; idx++) {
1411 int offset = operand_offset_at(idx); // offset in original array
1412 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1413 }
1414 // Copy the bootstrap specifiers only
1415 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1416 new_ops->adr_at(2*new_len),
1417 (min_size - 2*min_len) * sizeof(u2));
1418 // Explicitly deallocate old operands array.
1419 // Note, it is not needed for 7u backport.
1420 if ( operands() != NULL) { // the safety check
1421 MetadataFactory::free_array<u2>(loader_data, operands());
1422 }
1423 set_operands(new_ops);
1424 } // end resize_operands()
1425
1426
1427 // Extend the operands array with the length and size of the ext_cp operands.
1428 // Used in RedefineClasses for CP merge.
1429 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1430 int delta_len = operand_array_length(ext_cp->operands());
1431 if (delta_len == 0) {
1432 return; // nothing to do
1433 }
1434 int delta_size = ext_cp->operands()->length();
1435
1436 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1437
1438 if (operand_array_length(operands()) == 0) {
1439 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1440 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1441 // The first element index defines the offset of second part
1442 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1443 set_operands(new_ops);
1444 } else {
1445 resize_operands(delta_len, delta_size, CHECK);
1446 }
1447
1448 } // end extend_operands()
1449
1450
1451 // Shrink the operands array to a smaller array with new_len length.
1452 // Used in RedefineClasses for CP merge.
1453 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1454 int old_len = operand_array_length(operands());
1455 if (new_len == old_len) {
1456 return; // nothing to do
1457 }
1458 assert(new_len < old_len, "shrunken operands array must be smaller");
1459
1460 int free_base = operand_next_offset_at(new_len - 1);
1461 int delta_len = new_len - old_len;
1462 int delta_size = 2*delta_len + free_base - operands()->length();
1463
1464 resize_operands(delta_len, delta_size, CHECK);
1465
1466 } // end shrink_operands()
1467
1468
1469 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1470 const constantPoolHandle& to_cp,
1471 TRAPS) {
1472
1473 int from_oplen = operand_array_length(from_cp->operands());
1474 int old_oplen = operand_array_length(to_cp->operands());
1475 if (from_oplen != 0) {
1476 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1477 // append my operands to the target's operands array
1478 if (old_oplen == 0) {
1479 // Can't just reuse from_cp's operand list because of deallocation issues
1480 int len = from_cp->operands()->length();
1481 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1482 Copy::conjoint_memory_atomic(
1483 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1484 to_cp->set_operands(new_ops);
1485 } else {
1486 int old_len = to_cp->operands()->length();
1487 int from_len = from_cp->operands()->length();
1488 int old_off = old_oplen * sizeof(u2);
1489 int from_off = from_oplen * sizeof(u2);
1490 // Use the metaspace for the destination constant pool
1491 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1492 int fillp = 0, len = 0;
1493 // first part of dest
1494 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1495 new_operands->adr_at(fillp),
1496 (len = old_off) * sizeof(u2));
1497 fillp += len;
1498 // first part of src
1499 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1500 new_operands->adr_at(fillp),
1501 (len = from_off) * sizeof(u2));
1502 fillp += len;
1503 // second part of dest
1504 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1505 new_operands->adr_at(fillp),
1506 (len = old_len - old_off) * sizeof(u2));
1507 fillp += len;
1508 // second part of src
1509 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1510 new_operands->adr_at(fillp),
1511 (len = from_len - from_off) * sizeof(u2));
1512 fillp += len;
1513 assert(fillp == new_operands->length(), "");
1514
1515 // Adjust indexes in the first part of the copied operands array.
1516 for (int j = 0; j < from_oplen; j++) {
1517 int offset = operand_offset_at(new_operands, old_oplen + j);
1518 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1519 offset += old_len; // every new tuple is preceded by old_len extra u2's
1520 operand_offset_at_put(new_operands, old_oplen + j, offset);
1521 }
1522
1523 // replace target operands array with combined array
1524 to_cp->set_operands(new_operands);
1525 }
1526 }
1527 } // end copy_operands()
1528
1529
1530 // Copy this constant pool's entries at start_i to end_i (inclusive)
1531 // to the constant pool to_cp's entries starting at to_i. A total of
1532 // (end_i - start_i) + 1 entries are copied.
1533 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1534 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1535
1536
1537 int dest_i = to_i; // leave original alone for debug purposes
1538
1539 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1540 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1541
1542 switch (from_cp->tag_at(src_i).value()) {
1543 case JVM_CONSTANT_Double:
1544 case JVM_CONSTANT_Long:
1545 // double and long take two constant pool entries
1546 src_i += 2;
1547 dest_i += 2;
1548 break;
1549
1550 default:
1551 // all others take one constant pool entry
1552 src_i++;
1553 dest_i++;
1554 break;
1555 }
1556 }
1557 copy_operands(from_cp, to_cp, CHECK);
1558
1559 } // end copy_cp_to_impl()
1560
1561
1562 // Copy this constant pool's entry at from_i to the constant pool
1563 // to_cp's entry at to_i.
1564 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1565 const constantPoolHandle& to_cp, int to_i,
1566 TRAPS) {
1567
1568 int tag = from_cp->tag_at(from_i).value();
1569 switch (tag) {
1570 case JVM_CONSTANT_ClassIndex:
1571 {
1572 jint ki = from_cp->klass_index_at(from_i);
1573 to_cp->klass_index_at_put(to_i, ki);
1574 } break;
1575
1576 case JVM_CONSTANT_Double:
1577 {
1578 jdouble d = from_cp->double_at(from_i);
1579 to_cp->double_at_put(to_i, d);
1580 // double takes two constant pool entries so init second entry's tag
1581 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1582 } break;
1583
1584 case JVM_CONSTANT_Fieldref:
1585 {
1586 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1587 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1588 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1589 } break;
1590
1591 case JVM_CONSTANT_Float:
1592 {
1593 jfloat f = from_cp->float_at(from_i);
1594 to_cp->float_at_put(to_i, f);
1595 } break;
1596
1597 case JVM_CONSTANT_Integer:
1598 {
1599 jint i = from_cp->int_at(from_i);
1600 to_cp->int_at_put(to_i, i);
1601 } break;
1602
1603 case JVM_CONSTANT_InterfaceMethodref:
1604 {
1605 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1606 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1607 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1608 } break;
1609
1610 case JVM_CONSTANT_Long:
1611 {
1612 jlong l = from_cp->long_at(from_i);
1613 to_cp->long_at_put(to_i, l);
1614 // long takes two constant pool entries so init second entry's tag
1615 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1616 } break;
1617
1618 case JVM_CONSTANT_Methodref:
1619 {
1620 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1621 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1622 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1623 } break;
1624
1625 case JVM_CONSTANT_NameAndType:
1626 {
1627 int name_ref_index = from_cp->name_ref_index_at(from_i);
1628 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1629 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1630 } break;
1631
1632 case JVM_CONSTANT_StringIndex:
1633 {
1634 jint si = from_cp->string_index_at(from_i);
1635 to_cp->string_index_at_put(to_i, si);
1636 } break;
1637
1638 case JVM_CONSTANT_Class:
1639 case JVM_CONSTANT_UnresolvedClass:
1640 case JVM_CONSTANT_UnresolvedClassInError:
1641 {
1642 // Revert to JVM_CONSTANT_ClassIndex
1643 int name_index = from_cp->klass_slot_at(from_i).name_index();
1644 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1645 to_cp->klass_index_at_put(to_i, name_index);
1646 } break;
1647
1648 case JVM_CONSTANT_String:
1649 {
1650 Symbol* s = from_cp->unresolved_string_at(from_i);
1651 to_cp->unresolved_string_at_put(to_i, s);
1652 } break;
1653
1654 case JVM_CONSTANT_Utf8:
1655 {
1656 Symbol* s = from_cp->symbol_at(from_i);
1657 // Need to increase refcount, the old one will be thrown away and deferenced
1658 s->increment_refcount();
1659 to_cp->symbol_at_put(to_i, s);
1660 } break;
1661
1662 case JVM_CONSTANT_MethodType:
1663 case JVM_CONSTANT_MethodTypeInError:
1664 {
1665 jint k = from_cp->method_type_index_at(from_i);
1666 to_cp->method_type_index_at_put(to_i, k);
1667 } break;
1668
1669 case JVM_CONSTANT_MethodHandle:
1670 case JVM_CONSTANT_MethodHandleInError:
1671 {
1672 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1673 int k2 = from_cp->method_handle_index_at(from_i);
1674 to_cp->method_handle_index_at_put(to_i, k1, k2);
1675 } break;
1676
1677 case JVM_CONSTANT_Dynamic:
1678 case JVM_CONSTANT_DynamicInError:
1679 {
1680 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1681 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1682 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1683 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1684 } break;
1685
1686 case JVM_CONSTANT_InvokeDynamic:
1687 {
1688 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1689 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1690 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1691 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1692 } break;
1693
1694 // Invalid is used as the tag for the second constant pool entry
1695 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1696 // not be seen by itself.
1697 case JVM_CONSTANT_Invalid: // fall through
1698
1699 default:
1700 {
1701 ShouldNotReachHere();
1702 } break;
1703 }
1704 } // end copy_entry_to()
1705
1706 // Search constant pool search_cp for an entry that matches this
1707 // constant pool's entry at pattern_i. Returns the index of a
1708 // matching entry or zero (0) if there is no matching entry.
1709 int ConstantPool::find_matching_entry(int pattern_i,
1710 const constantPoolHandle& search_cp, TRAPS) {
1711
1712 // index zero (0) is not used
1713 for (int i = 1; i < search_cp->length(); i++) {
1714 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1715 if (found) {
1716 return i;
1717 }
1718 }
1719
1720 return 0; // entry not found; return unused index zero (0)
1721 } // end find_matching_entry()
1722
1723
1724 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1725 // cp2's bootstrap specifier at idx2.
1726 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1727 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1728 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1729 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1730
1731 if (!match) {
1732 return false;
1733 }
1734 int argc = operand_argument_count_at(idx1);
1735 if (argc == cp2->operand_argument_count_at(idx2)) {
1736 for (int j = 0; j < argc; j++) {
1737 k1 = operand_argument_index_at(idx1, j);
1738 k2 = cp2->operand_argument_index_at(idx2, j);
1739 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1740 if (!match) {
1741 return false;
1742 }
1743 }
1744 return true; // got through loop; all elements equal
1745 }
1746 return false;
1747 } // end compare_operand_to()
1748
1749 // Search constant pool search_cp for a bootstrap specifier that matches
1750 // this constant pool's bootstrap specifier data at pattern_i index.
1751 // Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1752 int ConstantPool::find_matching_operand(int pattern_i,
1753 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1754 for (int i = 0; i < search_len; i++) {
1755 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1756 if (found) {
1757 return i;
1758 }
1759 }
1760 return -1; // bootstrap specifier data not found; return unused index (-1)
1761 } // end find_matching_operand()
1762
1763
1764 #ifndef PRODUCT
1765
1766 const char* ConstantPool::printable_name_at(int which) {
1767
1768 constantTag tag = tag_at(which);
1769
1770 if (tag.is_string()) {
1771 return string_at_noresolve(which);
1772 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1773 return klass_name_at(which)->as_C_string();
1774 } else if (tag.is_symbol()) {
1775 return symbol_at(which)->as_C_string();
1776 }
1777 return "";
1778 }
1779
1780 #endif // PRODUCT
1781
1782
1783 // JVMTI GetConstantPool support
1784
1785 // For debugging of constant pool
1786 const bool debug_cpool = false;
1787
1788 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1789
1790 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1791 const char* WARN_MSG = "Must not be such entry!";
1792 jint size = 0;
1793 u2 idx1, idx2;
1794
1795 for (jint idx = 1; idx < cnt; idx++) {
1796 jint ent_size = 0;
1797 u1 tag = *bytes++;
1798 size++; // count tag
1799
1800 printf("const #%03d, tag: %02d ", idx, tag);
1801 switch(tag) {
1802 case JVM_CONSTANT_Invalid: {
1803 printf("Invalid");
1804 break;
1805 }
1806 case JVM_CONSTANT_Unicode: {
1807 printf("Unicode %s", WARN_MSG);
1808 break;
1809 }
1810 case JVM_CONSTANT_Utf8: {
1811 u2 len = Bytes::get_Java_u2(bytes);
1812 char str[128];
1813 if (len > 127) {
1814 len = 127;
1815 }
1816 strncpy(str, (char *) (bytes+2), len);
1817 str[len] = '\0';
1818 printf("Utf8 \"%s\"", str);
1819 ent_size = 2 + len;
1820 break;
1821 }
1822 case JVM_CONSTANT_Integer: {
1823 u4 val = Bytes::get_Java_u4(bytes);
1824 printf("int %d", *(int *) &val);
1825 ent_size = 4;
1826 break;
1827 }
1828 case JVM_CONSTANT_Float: {
1829 u4 val = Bytes::get_Java_u4(bytes);
1830 printf("float %5.3ff", *(float *) &val);
1831 ent_size = 4;
1832 break;
1833 }
1834 case JVM_CONSTANT_Long: {
1835 u8 val = Bytes::get_Java_u8(bytes);
1836 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1837 ent_size = 8;
1838 idx++; // Long takes two cpool slots
1839 break;
1840 }
1841 case JVM_CONSTANT_Double: {
1842 u8 val = Bytes::get_Java_u8(bytes);
1843 printf("double %5.3fd", *(jdouble *)&val);
1844 ent_size = 8;
1845 idx++; // Double takes two cpool slots
1846 break;
1847 }
1848 case JVM_CONSTANT_Class: {
1849 idx1 = Bytes::get_Java_u2(bytes);
1850 printf("class #%03d", idx1);
1851 ent_size = 2;
1852 break;
1853 }
1854 case JVM_CONSTANT_String: {
1855 idx1 = Bytes::get_Java_u2(bytes);
1856 printf("String #%03d", idx1);
1857 ent_size = 2;
1858 break;
1859 }
1860 case JVM_CONSTANT_Fieldref: {
1861 idx1 = Bytes::get_Java_u2(bytes);
1862 idx2 = Bytes::get_Java_u2(bytes+2);
1863 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1864 ent_size = 4;
1865 break;
1866 }
1867 case JVM_CONSTANT_Methodref: {
1868 idx1 = Bytes::get_Java_u2(bytes);
1869 idx2 = Bytes::get_Java_u2(bytes+2);
1870 printf("Method #%03d, #%03d", idx1, idx2);
1871 ent_size = 4;
1872 break;
1873 }
1874 case JVM_CONSTANT_InterfaceMethodref: {
1875 idx1 = Bytes::get_Java_u2(bytes);
1876 idx2 = Bytes::get_Java_u2(bytes+2);
1877 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1878 ent_size = 4;
1879 break;
1880 }
1881 case JVM_CONSTANT_NameAndType: {
1882 idx1 = Bytes::get_Java_u2(bytes);
1883 idx2 = Bytes::get_Java_u2(bytes+2);
1884 printf("NameAndType #%03d, #%03d", idx1, idx2);
1885 ent_size = 4;
1886 break;
1887 }
1888 case JVM_CONSTANT_ClassIndex: {
1889 printf("ClassIndex %s", WARN_MSG);
1890 break;
1891 }
1892 case JVM_CONSTANT_UnresolvedClass: {
1893 printf("UnresolvedClass: %s", WARN_MSG);
1894 break;
1895 }
1896 case JVM_CONSTANT_UnresolvedClassInError: {
1897 printf("UnresolvedClassInErr: %s", WARN_MSG);
1898 break;
1899 }
1900 case JVM_CONSTANT_StringIndex: {
1901 printf("StringIndex: %s", WARN_MSG);
1902 break;
1903 }
1904 }
1905 printf(";\n");
1906 bytes += ent_size;
1907 size += ent_size;
1908 }
1909 printf("Cpool size: %d\n", size);
1910 fflush(0);
1911 return;
1912 } /* end print_cpool_bytes */
1913
1914
1915 // Returns size of constant pool entry.
1916 jint ConstantPool::cpool_entry_size(jint idx) {
1917 switch(tag_at(idx).value()) {
1918 case JVM_CONSTANT_Invalid:
1919 case JVM_CONSTANT_Unicode:
1920 return 1;
1921
1922 case JVM_CONSTANT_Utf8:
1923 return 3 + symbol_at(idx)->utf8_length();
1924
1925 case JVM_CONSTANT_Class:
1926 case JVM_CONSTANT_String:
1927 case JVM_CONSTANT_ClassIndex:
1928 case JVM_CONSTANT_UnresolvedClass:
1929 case JVM_CONSTANT_UnresolvedClassInError:
1930 case JVM_CONSTANT_StringIndex:
1931 case JVM_CONSTANT_MethodType:
1932 case JVM_CONSTANT_MethodTypeInError:
1933 return 3;
1934
1935 case JVM_CONSTANT_MethodHandle:
1936 case JVM_CONSTANT_MethodHandleInError:
1937 return 4; //tag, ref_kind, ref_index
1938
1939 case JVM_CONSTANT_Integer:
1940 case JVM_CONSTANT_Float:
1941 case JVM_CONSTANT_Fieldref:
1942 case JVM_CONSTANT_Methodref:
1943 case JVM_CONSTANT_InterfaceMethodref:
1944 case JVM_CONSTANT_NameAndType:
1945 return 5;
1946
1947 case JVM_CONSTANT_Dynamic:
1948 case JVM_CONSTANT_DynamicInError:
1949 case JVM_CONSTANT_InvokeDynamic:
1950 // u1 tag, u2 bsm, u2 nt
1951 return 5;
1952
1953 case JVM_CONSTANT_Long:
1954 case JVM_CONSTANT_Double:
1955 return 9;
1956 }
1957 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1958 return 1;
1959 } /* end cpool_entry_size */
1960
1961
1962 // SymbolHashMap is used to find a constant pool index from a string.
1963 // This function fills in SymbolHashMaps, one for utf8s and one for
1964 // class names, returns size of the cpool raw bytes.
1965 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1966 SymbolHashMap *classmap) {
1967 jint size = 0;
1968
1969 for (u2 idx = 1; idx < length(); idx++) {
1970 u2 tag = tag_at(idx).value();
1971 size += cpool_entry_size(idx);
1972
1973 switch(tag) {
1974 case JVM_CONSTANT_Utf8: {
1975 Symbol* sym = symbol_at(idx);
1976 symmap->add_entry(sym, idx);
1977 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1978 break;
1979 }
1980 case JVM_CONSTANT_Class:
1981 case JVM_CONSTANT_UnresolvedClass:
1982 case JVM_CONSTANT_UnresolvedClassInError: {
1983 Symbol* sym = klass_name_at(idx);
1984 classmap->add_entry(sym, idx);
1985 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1986 break;
1987 }
1988 case JVM_CONSTANT_Long:
1989 case JVM_CONSTANT_Double: {
1990 idx++; // Both Long and Double take two cpool slots
1991 break;
1992 }
1993 }
1994 }
1995 return size;
1996 } /* end hash_utf8_entries_to */
1997
1998
1999 // Copy cpool bytes.
2000 // Returns:
2001 // 0, in case of OutOfMemoryError
2002 // -1, in case of internal error
2003 // > 0, count of the raw cpool bytes that have been copied
2004 int ConstantPool::copy_cpool_bytes(int cpool_size,
2005 SymbolHashMap* tbl,
2006 unsigned char *bytes) {
2007 u2 idx1, idx2;
2008 jint size = 0;
2009 jint cnt = length();
2010 unsigned char *start_bytes = bytes;
2011
2012 for (jint idx = 1; idx < cnt; idx++) {
2013 u1 tag = tag_at(idx).value();
2014 jint ent_size = cpool_entry_size(idx);
2015
2016 assert(size + ent_size <= cpool_size, "Size mismatch");
2017
2018 *bytes = tag;
2019 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2020 switch(tag) {
2021 case JVM_CONSTANT_Invalid: {
2022 DBG(printf("JVM_CONSTANT_Invalid"));
2023 break;
2024 }
2025 case JVM_CONSTANT_Unicode: {
2026 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2027 DBG(printf("JVM_CONSTANT_Unicode"));
2028 break;
2029 }
2030 case JVM_CONSTANT_Utf8: {
2031 Symbol* sym = symbol_at(idx);
2032 char* str = sym->as_utf8();
2033 // Warning! It's crashing on x86 with len = sym->utf8_length()
2034 int len = (int) strlen(str);
2035 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2036 for (int i = 0; i < len; i++) {
2037 bytes[3+i] = (u1) str[i];
2038 }
2039 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2040 break;
2041 }
2042 case JVM_CONSTANT_Integer: {
2043 jint val = int_at(idx);
2044 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2045 break;
2046 }
2047 case JVM_CONSTANT_Float: {
2048 jfloat val = float_at(idx);
2049 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2050 break;
2051 }
2052 case JVM_CONSTANT_Long: {
2053 jlong val = long_at(idx);
2054 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2055 idx++; // Long takes two cpool slots
2056 break;
2057 }
2058 case JVM_CONSTANT_Double: {
2059 jdouble val = double_at(idx);
2060 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2061 idx++; // Double takes two cpool slots
2062 break;
2063 }
2064 case JVM_CONSTANT_Class:
2065 case JVM_CONSTANT_UnresolvedClass:
2066 case JVM_CONSTANT_UnresolvedClassInError: {
2067 *bytes = JVM_CONSTANT_Class;
2068 Symbol* sym = klass_name_at(idx);
2069 idx1 = tbl->symbol_to_value(sym);
2070 assert(idx1 != 0, "Have not found a hashtable entry");
2071 Bytes::put_Java_u2((address) (bytes+1), idx1);
2072 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2073 break;
2074 }
2075 case JVM_CONSTANT_String: {
2076 *bytes = JVM_CONSTANT_String;
2077 Symbol* sym = unresolved_string_at(idx);
2078 idx1 = tbl->symbol_to_value(sym);
2079 assert(idx1 != 0, "Have not found a hashtable entry");
2080 Bytes::put_Java_u2((address) (bytes+1), idx1);
2081 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2082 break;
2083 }
2084 case JVM_CONSTANT_Fieldref:
2085 case JVM_CONSTANT_Methodref:
2086 case JVM_CONSTANT_InterfaceMethodref: {
2087 idx1 = uncached_klass_ref_index_at(idx);
2088 idx2 = uncached_name_and_type_ref_index_at(idx);
2089 Bytes::put_Java_u2((address) (bytes+1), idx1);
2090 Bytes::put_Java_u2((address) (bytes+3), idx2);
2091 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2092 break;
2093 }
2094 case JVM_CONSTANT_NameAndType: {
2095 idx1 = name_ref_index_at(idx);
2096 idx2 = signature_ref_index_at(idx);
2097 Bytes::put_Java_u2((address) (bytes+1), idx1);
2098 Bytes::put_Java_u2((address) (bytes+3), idx2);
2099 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2100 break;
2101 }
2102 case JVM_CONSTANT_ClassIndex: {
2103 *bytes = JVM_CONSTANT_Class;
2104 idx1 = klass_index_at(idx);
2105 Bytes::put_Java_u2((address) (bytes+1), idx1);
2106 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2107 break;
2108 }
2109 case JVM_CONSTANT_StringIndex: {
2110 *bytes = JVM_CONSTANT_String;
2111 idx1 = string_index_at(idx);
2112 Bytes::put_Java_u2((address) (bytes+1), idx1);
2113 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2114 break;
2115 }
2116 case JVM_CONSTANT_MethodHandle:
2117 case JVM_CONSTANT_MethodHandleInError: {
2118 *bytes = JVM_CONSTANT_MethodHandle;
2119 int kind = method_handle_ref_kind_at(idx);
2120 idx1 = method_handle_index_at(idx);
2121 *(bytes+1) = (unsigned char) kind;
2122 Bytes::put_Java_u2((address) (bytes+2), idx1);
2123 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2124 break;
2125 }
2126 case JVM_CONSTANT_MethodType:
2127 case JVM_CONSTANT_MethodTypeInError: {
2128 *bytes = JVM_CONSTANT_MethodType;
2129 idx1 = method_type_index_at(idx);
2130 Bytes::put_Java_u2((address) (bytes+1), idx1);
2131 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2132 break;
2133 }
2134 case JVM_CONSTANT_Dynamic:
2135 case JVM_CONSTANT_DynamicInError: {
2136 *bytes = tag;
2137 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2138 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2139 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2140 Bytes::put_Java_u2((address) (bytes+1), idx1);
2141 Bytes::put_Java_u2((address) (bytes+3), idx2);
2142 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2143 break;
2144 }
2145 case JVM_CONSTANT_InvokeDynamic: {
2146 *bytes = tag;
2147 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2148 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2149 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2150 Bytes::put_Java_u2((address) (bytes+1), idx1);
2151 Bytes::put_Java_u2((address) (bytes+3), idx2);
2152 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2153 break;
2154 }
2155 }
2156 DBG(printf("\n"));
2157 bytes += ent_size;
2158 size += ent_size;
2159 }
2160 assert(size == cpool_size, "Size mismatch");
2161
2162 // Keep temorarily for debugging until it's stable.
2163 DBG(print_cpool_bytes(cnt, start_bytes));
2164 return (int)(bytes - start_bytes);
2165 } /* end copy_cpool_bytes */
2166
2167 #undef DBG
2168
2169
2170 void ConstantPool::set_on_stack(const bool value) {
2171 if (value) {
2172 // Only record if it's not already set.
2173 if (!on_stack()) {
2174 assert(!is_shared(), "should always be set for shared constant pools");
2175 _flags |= _on_stack;
2176 MetadataOnStackMark::record(this);
2177 }
2178 } else {
2179 // Clearing is done single-threadedly.
2180 if (!is_shared()) {
2181 _flags &= ~_on_stack;
2182 }
2183 }
2184 }
2185
2186 // JSR 292 support for patching constant pool oops after the class is linked and
2187 // the oop array for resolved references are created.
2188 // We can't do this during classfile parsing, which is how the other indexes are
2189 // patched. The other patches are applied early for some error checking
2190 // so only defer the pseudo_strings.
2191 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
2192 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
2193 Handle patch = cp_patches->at(index);
2194 if (patch.not_null()) {
2195 assert (tag_at(index).is_string(), "should only be string left");
2196 // Patching a string means pre-resolving it.
2197 // The spelling in the constant pool is ignored.
2198 // The constant reference may be any object whatever.
2199 // If it is not a real interned string, the constant is referred
2200 // to as a "pseudo-string", and must be presented to the CP
2201 // explicitly, because it may require scavenging.
2202 int obj_index = cp_to_object_index(index);
2203 pseudo_string_at_put(index, obj_index, patch());
2204 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
2205 }
2206 }
2207 #ifdef ASSERT
2208 // Ensure that all the patches have been used.
2209 for (int index = 0; index < cp_patches->length(); index++) {
2210 assert(cp_patches->at(index).is_null(),
2211 "Unused constant pool patch at %d in class file %s",
2212 index,
2213 pool_holder()->external_name());
2214 }
2215 #endif // ASSERT
2216 }
2217
2218 // Printing
2219
2220 void ConstantPool::print_on(outputStream* st) const {
2221 assert(is_constantPool(), "must be constantPool");
2222 st->print_cr("%s", internal_name());
2223 if (flags() != 0) {
2224 st->print(" - flags: 0x%x", flags());
2225 if (has_preresolution()) st->print(" has_preresolution");
2226 if (on_stack()) st->print(" on_stack");
2227 st->cr();
2228 }
2229 if (pool_holder() != NULL) {
2230 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
2231 }
2232 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
2233 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
2234 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
2235 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
2236
2237 for (int index = 1; index < length(); index++) { // Index 0 is unused
2238 ((ConstantPool*)this)->print_entry_on(index, st);
2239 switch (tag_at(index).value()) {
2240 case JVM_CONSTANT_Long :
2241 case JVM_CONSTANT_Double :
2242 index++; // Skip entry following eigth-byte constant
2243 }
2244
2245 }
2246 st->cr();
2247 }
2248
2249 // Print one constant pool entry
2250 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2251 EXCEPTION_MARK;
2252 st->print(" - %3d : ", index);
2253 tag_at(index).print_on(st);
2254 st->print(" : ");
2255 switch (tag_at(index).value()) {
2256 case JVM_CONSTANT_Class :
2257 { Klass* k = klass_at(index, CATCH);
2258 guarantee(k != NULL, "need klass");
2259 k->print_value_on(st);
2260 st->print(" {" PTR_FORMAT "}", p2i(k));
2261 }
2262 break;
2263 case JVM_CONSTANT_Fieldref :
2264 case JVM_CONSTANT_Methodref :
2265 case JVM_CONSTANT_InterfaceMethodref :
2266 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2267 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2268 break;
2269 case JVM_CONSTANT_String :
2270 if (is_pseudo_string_at(index)) {
2271 oop anObj = pseudo_string_at(index);
2272 anObj->print_value_on(st);
2273 st->print(" {" PTR_FORMAT "}", p2i(anObj));
2274 } else {
2275 unresolved_string_at(index)->print_value_on(st);
2276 }
2277 break;
2278 case JVM_CONSTANT_Integer :
2279 st->print("%d", int_at(index));
2280 break;
2281 case JVM_CONSTANT_Float :
2282 st->print("%f", float_at(index));
2283 break;
2284 case JVM_CONSTANT_Long :
2285 st->print_jlong(long_at(index));
2286 break;
2287 case JVM_CONSTANT_Double :
2288 st->print("%lf", double_at(index));
2289 break;
2290 case JVM_CONSTANT_NameAndType :
2291 st->print("name_index=%d", name_ref_index_at(index));
2292 st->print(" signature_index=%d", signature_ref_index_at(index));
2293 break;
2294 case JVM_CONSTANT_Utf8 :
2295 symbol_at(index)->print_value_on(st);
2296 break;
2297 case JVM_CONSTANT_ClassIndex: {
2298 int name_index = *int_at_addr(index);
2299 st->print("klass_index=%d ", name_index);
2300 symbol_at(name_index)->print_value_on(st);
2301 }
2302 break;
2303 case JVM_CONSTANT_UnresolvedClass : // fall-through
2304 case JVM_CONSTANT_UnresolvedClassInError: {
2305 CPKlassSlot kslot = klass_slot_at(index);
2306 int resolved_klass_index = kslot.resolved_klass_index();
2307 int name_index = kslot.name_index();
2308 assert(tag_at(name_index).is_symbol(), "sanity");
2309
2310 Klass* klass = resolved_klasses()->at(resolved_klass_index);
2311 if (klass != NULL) {
2312 klass->print_value_on(st);
2313 } else {
2314 symbol_at(name_index)->print_value_on(st);
2315 }
2316 }
2317 break;
2318 case JVM_CONSTANT_MethodHandle :
2319 case JVM_CONSTANT_MethodHandleInError :
2320 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2321 st->print(" ref_index=%d", method_handle_index_at(index));
2322 break;
2323 case JVM_CONSTANT_MethodType :
2324 case JVM_CONSTANT_MethodTypeInError :
2325 st->print("signature_index=%d", method_type_index_at(index));
2326 break;
2327 case JVM_CONSTANT_Dynamic :
2328 case JVM_CONSTANT_DynamicInError :
2329 {
2330 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2331 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2332 int argc = bootstrap_argument_count_at(index);
2333 if (argc > 0) {
2334 for (int arg_i = 0; arg_i < argc; arg_i++) {
2335 int arg = bootstrap_argument_index_at(index, arg_i);
2336 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2337 }
2338 st->print("}");
2339 }
2340 }
2341 break;
2342 case JVM_CONSTANT_InvokeDynamic :
2343 {
2344 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2345 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2346 int argc = bootstrap_argument_count_at(index);
2347 if (argc > 0) {
2348 for (int arg_i = 0; arg_i < argc; arg_i++) {
2349 int arg = bootstrap_argument_index_at(index, arg_i);
2350 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2351 }
2352 st->print("}");
2353 }
2354 }
2355 break;
2356 default:
2357 ShouldNotReachHere();
2358 break;
2359 }
2360 st->cr();
2361 }
2362
2363 void ConstantPool::print_value_on(outputStream* st) const {
2364 assert(is_constantPool(), "must be constantPool");
2365 st->print("constant pool [%d]", length());
2366 if (has_preresolution()) st->print("/preresolution");
2367 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2368 print_address_on(st);
2369 if (pool_holder() != NULL) {
2370 st->print(" for ");
2371 pool_holder()->print_value_on(st);
2372 bool extra = (pool_holder()->constants() != this);
2373 if (extra) st->print(" (extra)");
2374 }
2375 if (cache() != NULL) {
2376 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2377 }
2378 }
2379
2380 #if INCLUDE_SERVICES
2381 // Size Statistics
2382 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
2383 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
2384 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
2385 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
2386 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
2387 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
2388
2389 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
2390 sz->_cp_refmap_bytes;
2391 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
2392 }
2393 #endif // INCLUDE_SERVICES
2394
2395 // Verification
2396
2397 void ConstantPool::verify_on(outputStream* st) {
2398 guarantee(is_constantPool(), "object must be constant pool");
2399 for (int i = 0; i< length(); i++) {
2400 constantTag tag = tag_at(i);
2401 if (tag.is_klass() || tag.is_unresolved_klass()) {
2402 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2403 } else if (tag.is_symbol()) {
2404 CPSlot entry = slot_at(i);
2405 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2406 } else if (tag.is_string()) {
2407 CPSlot entry = slot_at(i);
2408 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2409 }
2410 }
2411 if (pool_holder() != NULL) {
2412 // Note: pool_holder() can be NULL in temporary constant pools
2413 // used during constant pool merging
2414 guarantee(pool_holder()->is_klass(), "should be klass");
2415 }
2416 }
2417
2418
2419 SymbolHashMap::~SymbolHashMap() {
2420 SymbolHashMapEntry* next;
2421 for (int i = 0; i < _table_size; i++) {
2422 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
2423 next = cur->next();
2424 delete(cur);
2425 }
2426 }
2427 FREE_C_HEAP_ARRAY(SymbolHashMapBucket, _buckets);
2428 }
2429
2430 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2431 char *str = sym->as_utf8();
2432 unsigned int hash = compute_hash(str, sym->utf8_length());
2433 unsigned int index = hash % table_size();
2434
2435 // check if already in map
2436 // we prefer the first entry since it is more likely to be what was used in
2437 // the class file
2438 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2439 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2440 if (en->hash() == hash && en->symbol() == sym) {
2441 return; // already there
2442 }
2443 }
2444
2445 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2446 entry->set_next(bucket(index));
2447 _buckets[index].set_entry(entry);
2448 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2449 }
2450
2451 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2452 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2453 char *str = sym->as_utf8();
2454 int len = sym->utf8_length();
2455 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2456 unsigned int index = hash % table_size();
2457 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2458 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2459 if (en->hash() == hash && en->symbol() == sym) {
2460 return en;
2461 }
2462 }
2463 return NULL;
2464 }
2465
2466 void SymbolHashMap::initialize_table(int table_size) {
2467 _table_size = table_size;
2468 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
2469 for (int index = 0; index < table_size; index++) {
2470 _buckets[index].clear();
2471 }
2472 }