1 /*
2 * Copyright (c) 1997, 2020, 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 "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/heapShared.hpp"
39 #include "memory/metadataFactory.hpp"
40 #include "memory/metaspaceClosure.hpp"
41 #include "memory/metaspaceShared.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "memory/universe.hpp"
45 #include "oops/array.hpp"
46 #include "oops/constantPool.inline.hpp"
47 #include "oops/cpCache.inline.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/objArrayKlass.hpp"
50 #include "oops/objArrayOop.inline.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "oops/typeArrayOop.inline.hpp"
53 #include "runtime/atomic.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/init.hpp"
56 #include "runtime/javaCalls.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/thread.inline.hpp"
59 #include "runtime/vframe.inline.hpp"
60 #include "utilities/copy.hpp"
61
62 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
63 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
64 int size = ConstantPool::size(length);
65 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
66 }
67
68 void ConstantPool::copy_fields(const ConstantPool* orig) {
69 // Preserve dynamic constant information from the original pool
70 if (orig->has_dynamic_constant()) {
71 set_has_dynamic_constant();
72 }
73
74 // Copy class version
75 set_major_version(orig->major_version());
76 set_minor_version(orig->minor_version());
77
78 set_source_file_name_index(orig->source_file_name_index());
79 set_generic_signature_index(orig->generic_signature_index());
80 }
81
82 #ifdef ASSERT
83
84 // MetaspaceObj allocation invariant is calloc equivalent memory
85 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
86 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
87 assert(tags != NULL, "invariant");
88 const int length = tags->length();
89 for (int index = 0; index < length; ++index) {
90 if (JVM_CONSTANT_Invalid != tags->at(index)) {
91 return false;
92 }
93 }
94 return true;
95 }
96
97 #endif
98
99 ConstantPool::ConstantPool(Array<u1>* tags) :
100 _tags(tags),
101 _length(tags->length()) {
102
103 assert(_tags != NULL, "invariant");
104 assert(tags->length() == _length, "invariant");
105 assert(tag_array_is_zero_initialized(tags), "invariant");
106 assert(0 == flags(), "invariant");
107 assert(0 == version(), "invariant");
108 assert(NULL == _pool_holder, "invariant");
109 }
110
111 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
112 if (cache() != NULL) {
113 MetadataFactory::free_metadata(loader_data, cache());
114 set_cache(NULL);
115 }
116
117 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
118 set_resolved_klasses(NULL);
119
120 MetadataFactory::free_array<jushort>(loader_data, operands());
121 set_operands(NULL);
122
123 release_C_heap_structures();
124
125 // free tag array
126 MetadataFactory::free_array<u1>(loader_data, tags());
127 set_tags(NULL);
128 }
129
130 void ConstantPool::release_C_heap_structures() {
131 // walk constant pool and decrement symbol reference counts
132 unreference_symbols();
133 }
134
135 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
136 log_trace(cds)("Iter(ConstantPool): %p", this);
137
138 it->push(&_tags, MetaspaceClosure::_writable);
139 it->push(&_cache);
140 it->push(&_pool_holder);
141 it->push(&_operands);
142 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
143
144 for (int i = 0; i < length(); i++) {
145 // The only MSO's embedded in the CP entries are Symbols:
146 // JVM_CONSTANT_String (normal and pseudo)
147 // JVM_CONSTANT_Utf8
148 constantTag ctag = tag_at(i);
149 if (ctag.is_string() || ctag.is_utf8()) {
150 it->push(symbol_at_addr(i));
151 }
152 }
153 }
154
155 objArrayOop ConstantPool::resolved_references() const {
156 return (objArrayOop)_cache->resolved_references();
157 }
158
159 // Called from outside constant pool resolution where a resolved_reference array
160 // may not be present.
161 objArrayOop ConstantPool::resolved_references_or_null() const {
162 if (_cache == NULL) {
163 return NULL;
164 } else {
165 return (objArrayOop)_cache->resolved_references();
166 }
167 }
168
169 // Create resolved_references array and mapping array for original cp indexes
170 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
171 // to map it back for resolving and some unlikely miscellaneous uses.
172 // The objects created by invokedynamic are appended to this list.
173 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
174 const intStack& reference_map,
175 int constant_pool_map_length,
176 TRAPS) {
177 // Initialized the resolved object cache.
178 int map_length = reference_map.length();
179 if (map_length > 0) {
180 // Only need mapping back to constant pool entries. The map isn't used for
181 // invokedynamic resolved_reference entries. For invokedynamic entries,
182 // the constant pool cache index has the mapping back to both the constant
183 // pool and to the resolved reference index.
184 if (constant_pool_map_length > 0) {
185 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
186
187 for (int i = 0; i < constant_pool_map_length; i++) {
188 int x = reference_map.at(i);
189 assert(x == (int)(jushort) x, "klass index is too big");
190 om->at_put(i, (jushort)x);
191 }
192 set_reference_map(om);
193 }
194
195 // Create Java array for holding resolved strings, methodHandles,
196 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
197 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
198 Handle refs_handle (THREAD, (oop)stom); // must handleize.
199 set_resolved_references(loader_data->add_handle(refs_handle));
200 }
201 }
202
203 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
204 // A ConstantPool can't possibly have 0xffff valid class entries,
205 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
206 // entry for the class's name. So at most we will have 0xfffe class entries.
207 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
208 // UnresolvedKlass entries that are temporarily created during class redefinition.
209 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
210 assert(resolved_klasses() == NULL, "sanity");
211 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
212 set_resolved_klasses(rk);
213 }
214
215 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
216 int len = length();
217 int num_klasses = 0;
218 for (int i = 1; i <len; i++) {
219 switch (tag_at(i).value()) {
220 case JVM_CONSTANT_ClassIndex:
221 {
222 const int class_index = klass_index_at(i);
223 unresolved_klass_at_put(i, class_index, num_klasses++);
224 }
225 break;
226 #ifndef PRODUCT
227 case JVM_CONSTANT_Class:
228 case JVM_CONSTANT_UnresolvedClass:
229 case JVM_CONSTANT_UnresolvedClassInError:
230 // All of these should have been reverted back to ClassIndex before calling
231 // this function.
232 ShouldNotReachHere();
233 #endif
234 }
235 }
236 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
237 }
238
239 // Unsafe anonymous class support:
240 void ConstantPool::klass_at_put(int class_index, int name_index, int resolved_klass_index, Klass* k, Symbol* name) {
241 assert(is_within_bounds(class_index), "index out of bounds");
242 assert(is_within_bounds(name_index), "index out of bounds");
243 assert((resolved_klass_index & 0xffff0000) == 0, "must be");
244 *int_at_addr(class_index) =
245 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index);
246
247 symbol_at_put(name_index, name);
248 name->increment_refcount();
249 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
250 Atomic::release_store(adr, k);
251
252 // The interpreter assumes when the tag is stored, the klass is resolved
253 // and the Klass* non-NULL, so we need hardware store ordering here.
254 if (k != NULL) {
255 release_tag_at_put(class_index, JVM_CONSTANT_Class);
256 } else {
257 release_tag_at_put(class_index, JVM_CONSTANT_UnresolvedClass);
258 }
259 }
260
261 // Unsafe anonymous class support:
262 void ConstantPool::klass_at_put(int class_index, Klass* k) {
263 assert(k != NULL, "must be valid klass");
264 CPKlassSlot kslot = klass_slot_at(class_index);
265 int resolved_klass_index = kslot.resolved_klass_index();
266 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
267 Atomic::release_store(adr, k);
268
269 // The interpreter assumes when the tag is stored, the klass is resolved
270 // and the Klass* non-NULL, so we need hardware store ordering here.
271 release_tag_at_put(class_index, JVM_CONSTANT_Class);
272 }
273
274 #if INCLUDE_CDS_JAVA_HEAP
275 // Archive the resolved references
276 void ConstantPool::archive_resolved_references(Thread* THREAD) {
277 if (_cache == NULL) {
278 return; // nothing to do
279 }
280
281 InstanceKlass *ik = pool_holder();
282 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() ||
283 ik->is_shared_app_class())) {
284 // Archiving resolved references for classes from non-builtin loaders
285 // is not yet supported.
286 set_resolved_references(NULL);
287 return;
288 }
289
290 objArrayOop rr = resolved_references();
291 Array<u2>* ref_map = reference_map();
292 if (rr != NULL) {
293 int ref_map_len = ref_map == NULL ? 0 : ref_map->length();
294 int rr_len = rr->length();
295 for (int i = 0; i < rr_len; i++) {
296 oop p = rr->obj_at(i);
297 rr->obj_at_put(i, NULL);
298 if (p != NULL && i < ref_map_len) {
299 int index = object_to_cp_index(i);
300 if (tag_at(index).is_string()) {
301 oop op = StringTable::create_archived_string(p, THREAD);
302 // If the String object is not archived (possibly too large),
303 // NULL is returned. Also set it in the array, so we won't
304 // have a 'bad' reference in the archived resolved_reference
305 // array.
306 rr->obj_at_put(i, op);
307 }
308 }
309 }
310
311 oop archived = HeapShared::archive_heap_object(rr, THREAD);
312 // If the resolved references array is not archived (too large),
313 // the 'archived' object is NULL. No need to explicitly check
314 // the return value of archive_heap_object here. At runtime, the
315 // resolved references will be created using the normal process
316 // when there is no archived value.
317 _cache->set_archived_references(archived);
318 set_resolved_references(NULL);
319 }
320 }
321
322 void ConstantPool::resolve_class_constants(TRAPS) {
323 assert(DumpSharedSpaces, "used during dump time only");
324 // The _cache may be NULL if the _pool_holder klass fails verification
325 // at dump time due to missing dependencies.
326 if (cache() == NULL || reference_map() == NULL) {
327 return; // nothing to do
328 }
329
330 constantPoolHandle cp(THREAD, this);
331 for (int index = 1; index < length(); index++) { // Index 0 is unused
332 if (tag_at(index).is_string() && !cp->is_pseudo_string_at(index)) {
333 int cache_index = cp->cp_to_object_index(index);
334 string_at_impl(cp, index, cache_index, CHECK);
335 }
336 }
337 }
338 #endif
339
340 // CDS support. Create a new resolved_references array.
341 void ConstantPool::restore_unshareable_info(TRAPS) {
342 assert(is_constantPool(), "ensure C++ vtable is restored");
343 assert(on_stack(), "should always be set for shared constant pools");
344 assert(is_shared(), "should always be set for shared constant pools");
345 assert(_cache != NULL, "constant pool _cache should not be NULL");
346
347 // Only create the new resolved references array if it hasn't been attempted before
348 if (resolved_references() != NULL) return;
349
350 // restore the C++ vtable from the shared archive
351 restore_vtable();
352
353 if (SystemDictionary::Object_klass_loaded()) {
354 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
355 #if INCLUDE_CDS_JAVA_HEAP
356 if (HeapShared::open_archive_heap_region_mapped() &&
357 _cache->archived_references() != NULL) {
358 oop archived = _cache->archived_references();
359 // Create handle for the archived resolved reference array object
360 Handle refs_handle(THREAD, archived);
361 set_resolved_references(loader_data->add_handle(refs_handle));
362 } else
363 #endif
364 {
365 // No mapped archived resolved reference array
366 // Recreate the object array and add to ClassLoaderData.
367 int map_length = resolved_reference_length();
368 if (map_length > 0) {
369 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
370 Handle refs_handle(THREAD, (oop)stom); // must handleize.
371 set_resolved_references(loader_data->add_handle(refs_handle));
372 }
373 }
374 }
375 }
376
377 void ConstantPool::remove_unshareable_info() {
378 // Resolved references are not in the shared archive.
379 // Save the length for restoration. It is not necessarily the same length
380 // as reference_map.length() if invokedynamic is saved. It is needed when
381 // re-creating the resolved reference array if archived heap data cannot be map
382 // at runtime.
383 set_resolved_reference_length(
384 resolved_references() != NULL ? resolved_references()->length() : 0);
385
386 // If archiving heap objects is not allowed, clear the resolved references.
387 // Otherwise, it is cleared after the resolved references array is cached
388 // (see archive_resolved_references()).
389 // If DynamicDumpSharedSpaces is enabled, clear the resolved references also
390 // as java objects are not archived in the top layer.
391 if (!HeapShared::is_heap_object_archiving_allowed() || DynamicDumpSharedSpaces) {
392 set_resolved_references(NULL);
393 }
394
395 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
396 // The _on_stack flag is used to prevent ConstantPools from deallocation during
397 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
398 // we always set _on_stack to true to avoid having to change _flags during runtime.
399 _flags |= (_on_stack | _is_shared);
400 int num_klasses = 0;
401 for (int index = 1; index < length(); index++) { // Index 0 is unused
402 if (!DynamicDumpSharedSpaces) {
403 assert(!tag_at(index).is_unresolved_klass_in_error(), "This must not happen during static dump time");
404 } else {
405 if (tag_at(index).is_unresolved_klass_in_error() ||
406 tag_at(index).is_method_handle_in_error() ||
407 tag_at(index).is_method_type_in_error() ||
408 tag_at(index).is_dynamic_constant_in_error()) {
409 tag_at_put(index, JVM_CONSTANT_UnresolvedClass);
410 }
411 }
412 if (tag_at(index).is_klass()) {
413 // This class was resolved as a side effect of executing Java code
414 // during dump time. We need to restore it back to an UnresolvedClass,
415 // so that the proper class loading and initialization can happen
416 // at runtime.
417 CPKlassSlot kslot = klass_slot_at(index);
418 int resolved_klass_index = kslot.resolved_klass_index();
419 int name_index = kslot.name_index();
420 assert(tag_at(name_index).is_symbol(), "sanity");
421 resolved_klasses()->at_put(resolved_klass_index, NULL);
422 tag_at_put(index, JVM_CONSTANT_UnresolvedClass);
423 assert(klass_name_at(index) == symbol_at(name_index), "sanity");
424 }
425 }
426 if (cache() != NULL) {
427 cache()->remove_unshareable_info();
428 }
429 }
430
431 int ConstantPool::cp_to_object_index(int cp_index) {
432 // this is harder don't do this so much.
433 int i = reference_map()->find(cp_index);
434 // We might not find the index for jsr292 call.
435 return (i < 0) ? _no_index_sentinel : i;
436 }
437
438 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
439 resolved_references()->obj_at_put(obj_index, str);
440 }
441
442 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
443 ResourceMark rm;
444 int line_number = -1;
445 const char * source_file = NULL;
446 if (JavaThread::current()->has_last_Java_frame()) {
447 // try to identify the method which called this function.
448 vframeStream vfst(JavaThread::current());
449 if (!vfst.at_end()) {
450 line_number = vfst.method()->line_number_from_bci(vfst.bci());
451 Symbol* s = vfst.method()->method_holder()->source_file_name();
452 if (s != NULL) {
453 source_file = s->as_C_string();
454 }
455 }
456 }
457 if (k != this_cp->pool_holder()) {
458 // only print something if the classes are different
459 if (source_file != NULL) {
460 log_debug(class, resolve)("%s %s %s:%d",
461 this_cp->pool_holder()->external_name(),
462 k->external_name(), source_file, line_number);
463 } else {
464 log_debug(class, resolve)("%s %s",
465 this_cp->pool_holder()->external_name(),
466 k->external_name());
467 }
468 }
469 }
470
471 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
472 bool save_resolution_error, TRAPS) {
473 assert(THREAD->is_Java_thread(), "must be a Java thread");
474 JavaThread* javaThread = (JavaThread*)THREAD;
475
476 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
477 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
478 // the entry and tag is not updated atomicly.
479 CPKlassSlot kslot = this_cp->klass_slot_at(which);
480 int resolved_klass_index = kslot.resolved_klass_index();
481 int name_index = kslot.name_index();
482 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
483
484 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
485 if (klass != NULL) {
486 return klass;
487 }
488
489 // This tag doesn't change back to unresolved class unless at a safepoint.
490 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
491 // The original attempt to resolve this constant pool entry failed so find the
492 // class of the original error and throw another error of the same class
493 // (JVMS 5.4.3).
494 // If there is a detail message, pass that detail message to the error.
495 // The JVMS does not strictly require us to duplicate the same detail message,
496 // or any internal exception fields such as cause or stacktrace. But since the
497 // detail message is often a class name or other literal string, we will repeat it
498 // if we can find it in the symbol table.
499 throw_resolution_error(this_cp, which, CHECK_NULL);
500 ShouldNotReachHere();
501 }
502
503 Handle mirror_handle;
504 Symbol* name = this_cp->symbol_at(name_index);
505 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
506 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
507
508 Klass* k;
509 {
510 // Turn off the single stepping while doing class resolution
511 JvmtiHideSingleStepping jhss(javaThread);
512 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
513 } // JvmtiHideSingleStepping jhss(javaThread);
514
515 if (!HAS_PENDING_EXCEPTION) {
516 // preserve the resolved klass from unloading
517 mirror_handle = Handle(THREAD, k->java_mirror());
518 // Do access check for klasses
519 verify_constant_pool_resolve(this_cp, k, THREAD);
520 }
521
522 // Failed to resolve class. We must record the errors so that subsequent attempts
523 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
524 if (HAS_PENDING_EXCEPTION) {
525 if (save_resolution_error) {
526 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
527 // If CHECK_NULL above doesn't return the exception, that means that
528 // some other thread has beaten us and has resolved the class.
529 // To preserve old behavior, we return the resolved class.
530 klass = this_cp->resolved_klasses()->at(resolved_klass_index);
531 assert(klass != NULL, "must be resolved if exception was cleared");
532 return klass;
533 } else {
534 return NULL; // return the pending exception
535 }
536 }
537
538 // logging for class+resolve.
539 if (log_is_enabled(Debug, class, resolve)){
540 trace_class_resolution(this_cp, k);
541 }
542 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
543 Atomic::release_store(adr, k);
544 // The interpreter assumes when the tag is stored, the klass is resolved
545 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
546 // hardware store ordering here.
547 this_cp->release_tag_at_put(which, JVM_CONSTANT_Class);
548 return k;
549 }
550
551
552 // Does not update ConstantPool* - to avoid any exception throwing. Used
553 // by compiler and exception handling. Also used to avoid classloads for
554 // instanceof operations. Returns NULL if the class has not been loaded or
555 // if the verification of constant pool failed
556 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
557 CPKlassSlot kslot = this_cp->klass_slot_at(which);
558 int resolved_klass_index = kslot.resolved_klass_index();
559 int name_index = kslot.name_index();
560 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
561
562 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
563 if (k != NULL) {
564 return k;
565 } else {
566 Thread *thread = Thread::current();
567 Symbol* name = this_cp->symbol_at(name_index);
568 oop loader = this_cp->pool_holder()->class_loader();
569 oop protection_domain = this_cp->pool_holder()->protection_domain();
570 Handle h_prot (thread, protection_domain);
571 Handle h_loader (thread, loader);
572 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
573
574 // Avoid constant pool verification at a safepoint, which takes the Module_lock.
575 if (k != NULL && !SafepointSynchronize::is_at_safepoint()) {
576 // Make sure that resolving is legal
577 EXCEPTION_MARK;
578 // return NULL if verification fails
579 verify_constant_pool_resolve(this_cp, k, THREAD);
580 if (HAS_PENDING_EXCEPTION) {
581 CLEAR_PENDING_EXCEPTION;
582 return NULL;
583 }
584 return k;
585 } else {
586 return k;
587 }
588 }
589 }
590
591 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
592 int which) {
593 if (cpool->cache() == NULL) return NULL; // nothing to load yet
594 int cache_index = decode_cpcache_index(which, true);
595 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
596 // FIXME: should be an assert
597 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
598 return NULL;
599 }
600 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
601 return e->method_if_resolved(cpool);
602 }
603
604
605 bool ConstantPool::has_appendix_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_appendix();
610 }
611
612 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
613 if (cpool->cache() == NULL) return NULL; // nothing to load yet
614 int cache_index = decode_cpcache_index(which, true);
615 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
616 return e->appendix_if_resolved(cpool);
617 }
618
619
620 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) {
621 if (cpool->cache() == NULL) return false; // nothing to load yet
622 int cache_index = decode_cpcache_index(which, true);
623 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
624 return e->has_local_signature();
625 }
626
627 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
628 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
629 return symbol_at(name_index);
630 }
631
632
633 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
634 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
635 return symbol_at(signature_index);
636 }
637
638 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
639 int i = which;
640 if (!uncached && cache() != NULL) {
641 if (ConstantPool::is_invokedynamic_index(which)) {
642 // Invokedynamic index is index into the constant pool cache
643 int pool_index = invokedynamic_bootstrap_ref_index_at(which);
644 pool_index = bootstrap_name_and_type_ref_index_at(pool_index);
645 assert(tag_at(pool_index).is_name_and_type(), "");
646 return pool_index;
647 }
648 // change byte-ordering and go via cache
649 i = remap_instruction_operand_from_cache(which);
650 } else {
651 if (tag_at(which).has_bootstrap()) {
652 int pool_index = bootstrap_name_and_type_ref_index_at(which);
653 assert(tag_at(pool_index).is_name_and_type(), "");
654 return pool_index;
655 }
656 }
657 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
658 assert(!tag_at(i).has_bootstrap(), "Must be handled above");
659 jint ref_index = *int_at_addr(i);
660 return extract_high_short_from_int(ref_index);
661 }
662
663 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
664 int pool_index = which;
665 if (!uncached && cache() != NULL) {
666 if (ConstantPool::is_invokedynamic_index(which)) {
667 // Invokedynamic index is index into resolved_references
668 pool_index = invokedynamic_bootstrap_ref_index_at(which);
669 } else {
670 // change byte-ordering and go via cache
671 pool_index = remap_instruction_operand_from_cache(which);
672 }
673 }
674 return tag_at(pool_index);
675 }
676
677 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
678 guarantee(!ConstantPool::is_invokedynamic_index(which),
679 "an invokedynamic instruction does not have a klass");
680 int i = which;
681 if (!uncached && cache() != NULL) {
682 // change byte-ordering and go via cache
683 i = remap_instruction_operand_from_cache(which);
684 }
685 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
686 jint ref_index = *int_at_addr(i);
687 return extract_low_short_from_int(ref_index);
688 }
689
690
691
692 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
693 int cpc_index = operand;
694 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
695 assert((int)(u2)cpc_index == cpc_index, "clean u2");
696 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
697 return member_index;
698 }
699
700
701 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
702 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
703 return; // short cut, typeArray klass is always accessible
704 }
705 Klass* holder = this_cp->pool_holder();
706 LinkResolver::check_klass_accessibility(holder, k, CHECK);
707 }
708
709
710 int ConstantPool::name_ref_index_at(int which_nt) {
711 jint ref_index = name_and_type_at(which_nt);
712 return extract_low_short_from_int(ref_index);
713 }
714
715
716 int ConstantPool::signature_ref_index_at(int which_nt) {
717 jint ref_index = name_and_type_at(which_nt);
718 return extract_high_short_from_int(ref_index);
719 }
720
721
722 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
723 return klass_at(klass_ref_index_at(which), THREAD);
724 }
725
726 Symbol* ConstantPool::klass_name_at(int which) const {
727 return symbol_at(klass_slot_at(which).name_index());
728 }
729
730 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
731 jint ref_index = klass_ref_index_at(which);
732 return klass_at_noresolve(ref_index);
733 }
734
735 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
736 jint ref_index = uncached_klass_ref_index_at(which);
737 return klass_at_noresolve(ref_index);
738 }
739
740 char* ConstantPool::string_at_noresolve(int which) {
741 return unresolved_string_at(which)->as_C_string();
742 }
743
744 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
745 return Signature::basic_type(symbol_at(which));
746 }
747
748
749 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
750 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
751 if (this_cp->tag_at(index).is_string()) {
752 this_cp->string_at(index, CHECK);
753 }
754 }
755 }
756
757 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
758 // Dig out the detailed message to reuse if possible
759 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
760 if (message != NULL) {
761 return message;
762 }
763
764 // Return specific message for the tag
765 switch (tag.value()) {
766 case JVM_CONSTANT_UnresolvedClass:
767 // return the class name in the error message
768 message = this_cp->klass_name_at(which);
769 break;
770 case JVM_CONSTANT_MethodHandle:
771 // return the method handle name in the error message
772 message = this_cp->method_handle_name_ref_at(which);
773 break;
774 case JVM_CONSTANT_MethodType:
775 // return the method type signature in the error message
776 message = this_cp->method_type_signature_at(which);
777 break;
778 case JVM_CONSTANT_Dynamic:
779 // return the name of the condy in the error message
780 message = this_cp->uncached_name_ref_at(which);
781 break;
782 default:
783 ShouldNotReachHere();
784 }
785
786 return message;
787 }
788
789 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
790 Symbol* message = NULL;
791 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
792 assert(error != NULL, "checking");
793 CLEAR_PENDING_EXCEPTION;
794 if (message != NULL) {
795 ResourceMark rm;
796 THROW_MSG(error, message->as_C_string());
797 } else {
798 THROW(error);
799 }
800 }
801
802 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
803 // exception in the resolution error table, so that the same exception is thrown again.
804 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
805 constantTag tag, TRAPS) {
806 Symbol* error = PENDING_EXCEPTION->klass()->name();
807
808 int error_tag = tag.error_value();
809
810 if (!PENDING_EXCEPTION->
811 is_a(SystemDictionary::LinkageError_klass())) {
812 // Just throw the exception and don't prevent these classes from
813 // being loaded due to virtual machine errors like StackOverflow
814 // and OutOfMemoryError, etc, or if the thread was hit by stop()
815 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
816 } else if (this_cp->tag_at(which).value() != error_tag) {
817 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
818 SystemDictionary::add_resolution_error(this_cp, which, error, message);
819 // CAS in the tag. If a thread beat us to registering this error that's fine.
820 // If another thread resolved the reference, this is a race condition. This
821 // thread may have had a security manager or something temporary.
822 // This doesn't deterministically get an error. So why do we save this?
823 // We save this because jvmti can add classes to the bootclass path after
824 // this error, so it needs to get the same error if the error is first.
825 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
826 (jbyte)tag.value(),
827 (jbyte)error_tag);
828 if (old_tag != error_tag && old_tag != tag.value()) {
829 // MethodHandles and MethodType doesn't change to resolved version.
830 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
831 // Forget the exception and use the resolved class.
832 CLEAR_PENDING_EXCEPTION;
833 }
834 } else {
835 // some other thread put this in error state
836 throw_resolution_error(this_cp, which, CHECK);
837 }
838 }
839
840 constantTag ConstantPool::constant_tag_at(int which) {
841 constantTag tag = tag_at(which);
842 if (tag.is_dynamic_constant() ||
843 tag.is_dynamic_constant_in_error()) {
844 BasicType bt = basic_type_for_constant_at(which);
845 // dynamic constant could return an array, treat as object
846 return constantTag::ofBasicType(is_reference_type(bt) ? T_OBJECT : bt);
847 }
848 return tag;
849 }
850
851 BasicType ConstantPool::basic_type_for_constant_at(int which) {
852 constantTag tag = tag_at(which);
853 if (tag.is_dynamic_constant() ||
854 tag.is_dynamic_constant_in_error()) {
855 // have to look at the signature for this one
856 Symbol* constant_type = uncached_signature_ref_at(which);
857 return Signature::basic_type(constant_type);
858 }
859 return tag.basic_type();
860 }
861
862 // Called to resolve constants in the constant pool and return an oop.
863 // Some constant pool entries cache their resolved oop. This is also
864 // called to create oops from constants to use in arguments for invokedynamic
865 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
866 int index, int cache_index,
867 bool* status_return, TRAPS) {
868 oop result_oop = NULL;
869 Handle throw_exception;
870
871 if (cache_index == _possible_index_sentinel) {
872 // It is possible that this constant is one which is cached in the objects.
873 // We'll do a linear search. This should be OK because this usage is rare.
874 // FIXME: If bootstrap specifiers stress this code, consider putting in
875 // a reverse index. Binary search over a short array should do it.
876 assert(index > 0, "valid index");
877 cache_index = this_cp->cp_to_object_index(index);
878 }
879 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
880 assert(index == _no_index_sentinel || index >= 0, "");
881
882 if (cache_index >= 0) {
883 result_oop = this_cp->resolved_references()->obj_at(cache_index);
884 if (result_oop != NULL) {
885 if (result_oop == Universe::the_null_sentinel()) {
886 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index)));
887 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
888 result_oop = NULL;
889 }
890 if (status_return != NULL) (*status_return) = true;
891 return result_oop;
892 // That was easy...
893 }
894 index = this_cp->object_to_cp_index(cache_index);
895 }
896
897 jvalue prim_value; // temp used only in a few cases below
898
899 constantTag tag = this_cp->tag_at(index);
900
901 if (status_return != NULL) {
902 // don't trigger resolution if the constant might need it
903 switch (tag.value()) {
904 case JVM_CONSTANT_Class:
905 {
906 CPKlassSlot kslot = this_cp->klass_slot_at(index);
907 int resolved_klass_index = kslot.resolved_klass_index();
908 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) {
909 (*status_return) = false;
910 return NULL;
911 }
912 // the klass is waiting in the CP; go get it
913 break;
914 }
915 case JVM_CONSTANT_String:
916 case JVM_CONSTANT_Integer:
917 case JVM_CONSTANT_Float:
918 case JVM_CONSTANT_Long:
919 case JVM_CONSTANT_Double:
920 // these guys trigger OOM at worst
921 break;
922 default:
923 (*status_return) = false;
924 return NULL;
925 }
926 // from now on there is either success or an OOME
927 (*status_return) = true;
928 }
929
930 switch (tag.value()) {
931
932 case JVM_CONSTANT_UnresolvedClass:
933 case JVM_CONSTANT_UnresolvedClassInError:
934 case JVM_CONSTANT_Class:
935 {
936 assert(cache_index == _no_index_sentinel, "should not have been set");
937 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
938 // ldc wants the java mirror.
939 result_oop = resolved->java_mirror();
940 break;
941 }
942
943 case JVM_CONSTANT_Dynamic:
944 {
945 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
946 BootstrapInfo bootstrap_specifier(this_cp, index);
947
948 // The initial step in resolving an unresolved symbolic reference to a
949 // dynamically-computed constant is to resolve the symbolic reference to a
950 // method handle which will be the bootstrap method for the dynamically-computed
951 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
952 // method fails, then a MethodHandleInError is stored at the corresponding
953 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
954 // set a DynamicConstantInError here since any subsequent use of this
955 // bootstrap method will encounter the resolution of MethodHandleInError.
956 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
957 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
958 // for the bootstrap_specifier created above.
959 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
960 Exceptions::wrap_dynamic_exception(/* is_indy */ false, THREAD);
961 if (HAS_PENDING_EXCEPTION) {
962 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
963 // will check for a LinkageError and store a DynamicConstantInError.
964 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
965 }
966 result_oop = bootstrap_specifier.resolved_value()();
967 BasicType type = Signature::basic_type(bootstrap_specifier.signature());
968 if (!is_reference_type(type)) {
969 // Make sure the primitive value is properly boxed.
970 // This is a JDK responsibility.
971 const char* fail = NULL;
972 if (result_oop == NULL) {
973 fail = "null result instead of box";
974 } else if (!is_java_primitive(type)) {
975 // FIXME: support value types via unboxing
976 fail = "can only handle references and primitives";
977 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
978 fail = "primitive is not properly boxed";
979 }
980 if (fail != NULL) {
981 // Since this exception is not a LinkageError, throw exception
982 // but do not save a DynamicInError resolution result.
983 // See section 5.4.3 of the VM spec.
984 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
985 }
986 }
987
988 LogTarget(Debug, methodhandles, condy) lt_condy;
989 if (lt_condy.is_enabled()) {
990 LogStream ls(lt_condy);
991 bootstrap_specifier.print_msg_on(&ls, "resolve_constant_at_impl");
992 }
993 break;
994 }
995
996 case JVM_CONSTANT_String:
997 assert(cache_index != _no_index_sentinel, "should have been set");
998 if (this_cp->is_pseudo_string_at(index)) {
999 result_oop = this_cp->pseudo_string_at(index, cache_index);
1000 break;
1001 }
1002 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
1003 break;
1004
1005 case JVM_CONSTANT_DynamicInError:
1006 case JVM_CONSTANT_MethodHandleInError:
1007 case JVM_CONSTANT_MethodTypeInError:
1008 {
1009 throw_resolution_error(this_cp, index, CHECK_NULL);
1010 break;
1011 }
1012
1013 case JVM_CONSTANT_MethodHandle:
1014 {
1015 int ref_kind = this_cp->method_handle_ref_kind_at(index);
1016 int callee_index = this_cp->method_handle_klass_index_at(index);
1017 Symbol* name = this_cp->method_handle_name_ref_at(index);
1018 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
1019 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
1020 { ResourceMark rm(THREAD);
1021 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1022 ref_kind, index, this_cp->method_handle_index_at(index),
1023 callee_index, name->as_C_string(), signature->as_C_string());
1024 }
1025
1026 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
1027
1028 // Check constant pool method consistency
1029 if ((callee->is_interface() && m_tag.is_method()) ||
1030 ((!callee->is_interface() && m_tag.is_interface_method()))) {
1031 ResourceMark rm(THREAD);
1032 stringStream ss;
1033 ss.print("Inconsistent constant pool data in classfile for class %s. "
1034 "Method '", callee->name()->as_C_string());
1035 signature->print_as_signature_external_return_type(&ss);
1036 ss.print(" %s(", name->as_C_string());
1037 signature->print_as_signature_external_parameters(&ss);
1038 ss.print(")' at index %d is %s and should be %s",
1039 index,
1040 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1041 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1042 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1043 }
1044
1045 Klass* klass = this_cp->pool_holder();
1046 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1047 callee, name, signature,
1048 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_MethodType:
1057 {
1058 Symbol* signature = this_cp->method_type_signature_at(index);
1059 { ResourceMark rm(THREAD);
1060 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1061 index, this_cp->method_type_index_at(index),
1062 signature->as_C_string());
1063 }
1064 Klass* klass = this_cp->pool_holder();
1065 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1066 result_oop = value();
1067 if (HAS_PENDING_EXCEPTION) {
1068 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1069 }
1070 break;
1071 }
1072
1073 case JVM_CONSTANT_Integer:
1074 assert(cache_index == _no_index_sentinel, "should not have been set");
1075 prim_value.i = this_cp->int_at(index);
1076 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1077 break;
1078
1079 case JVM_CONSTANT_Float:
1080 assert(cache_index == _no_index_sentinel, "should not have been set");
1081 prim_value.f = this_cp->float_at(index);
1082 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1083 break;
1084
1085 case JVM_CONSTANT_Long:
1086 assert(cache_index == _no_index_sentinel, "should not have been set");
1087 prim_value.j = this_cp->long_at(index);
1088 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1089 break;
1090
1091 case JVM_CONSTANT_Double:
1092 assert(cache_index == _no_index_sentinel, "should not have been set");
1093 prim_value.d = this_cp->double_at(index);
1094 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1095 break;
1096
1097 default:
1098 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
1099 this_cp(), index, cache_index, tag.value()));
1100 assert(false, "unexpected constant tag");
1101 break;
1102 }
1103
1104 if (cache_index >= 0) {
1105 // Benign race condition: resolved_references may already be filled in.
1106 // The important thing here is that all threads pick up the same result.
1107 // It doesn't matter which racing thread wins, as long as only one
1108 // result is used by all threads, and all future queries.
1109 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop);
1110 oop old_result = this_cp->resolved_references()
1111 ->atomic_compare_exchange_oop(cache_index, new_result, NULL);
1112 if (old_result == NULL) {
1113 return result_oop; // was installed
1114 } else {
1115 // Return the winning thread's result. This can be different than
1116 // the result here for MethodHandles.
1117 if (old_result == Universe::the_null_sentinel())
1118 old_result = NULL;
1119 return old_result;
1120 }
1121 } else {
1122 assert(result_oop != Universe::the_null_sentinel(), "");
1123 return result_oop;
1124 }
1125 }
1126
1127 oop ConstantPool::uncached_string_at(int which, TRAPS) {
1128 Symbol* sym = unresolved_string_at(which);
1129 oop str = StringTable::intern(sym, CHECK_(NULL));
1130 assert(java_lang_String::is_instance(str), "must be string");
1131 return str;
1132 }
1133
1134 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index,
1135 int start_arg, int end_arg,
1136 objArrayHandle info, int pos,
1137 bool must_resolve, Handle if_not_available,
1138 TRAPS) {
1139 int argc;
1140 int limit = pos + end_arg - start_arg;
1141 // checks: index in range [0..this_cp->length),
1142 // tag at index, start..end in range [0..argc],
1143 // info array non-null, pos..limit in [0..info.length]
1144 if ((0 >= index || index >= this_cp->length()) ||
1145 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1146 this_cp->tag_at(index).is_dynamic_constant()) ||
1147 (0 > start_arg || start_arg > end_arg) ||
1148 (end_arg > (argc = this_cp->bootstrap_argument_count_at(index))) ||
1149 (0 > pos || pos > limit) ||
1150 (info.is_null() || limit > info->length())) {
1151 // An index or something else went wrong; throw an error.
1152 // Since this is an internal API, we don't expect this,
1153 // so we don't bother to craft a nice message.
1154 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1155 }
1156 // now we can loop safely
1157 int info_i = pos;
1158 for (int i = start_arg; i < end_arg; i++) {
1159 int arg_index = this_cp->bootstrap_argument_index_at(index, i);
1160 oop arg_oop;
1161 if (must_resolve) {
1162 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1163 } else {
1164 bool found_it = false;
1165 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1166 if (!found_it) arg_oop = if_not_available();
1167 }
1168 info->obj_at_put(info_i++, arg_oop);
1169 }
1170 }
1171
1172 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1173 // If the string has already been interned, this entry will be non-null
1174 oop str = this_cp->resolved_references()->obj_at(obj_index);
1175 assert(str != Universe::the_null_sentinel(), "");
1176 if (str != NULL) return str;
1177 Symbol* sym = this_cp->unresolved_string_at(which);
1178 str = StringTable::intern(sym, CHECK_(NULL));
1179 this_cp->string_at_put(which, obj_index, str);
1180 assert(java_lang_String::is_instance(str), "must be string");
1181 return str;
1182 }
1183
1184
1185 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1186 // Names are interned, so we can compare Symbol*s directly
1187 Symbol* cp_name = klass_name_at(which);
1188 return (cp_name == k->name());
1189 }
1190
1191
1192 // Iterate over symbols and decrement ones which are Symbol*s
1193 // This is done during GC.
1194 // Only decrement the UTF8 symbols. Strings point to
1195 // these symbols but didn't increment the reference count.
1196 void ConstantPool::unreference_symbols() {
1197 for (int index = 1; index < length(); index++) { // Index 0 is unused
1198 constantTag tag = tag_at(index);
1199 if (tag.is_symbol()) {
1200 symbol_at(index)->decrement_refcount();
1201 }
1202 }
1203 }
1204
1205
1206 // Compare this constant pool's entry at index1 to the constant pool
1207 // cp2's entry at index2.
1208 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1209 int index2, TRAPS) {
1210
1211 // The error tags are equivalent to non-error tags when comparing
1212 jbyte t1 = tag_at(index1).non_error_value();
1213 jbyte t2 = cp2->tag_at(index2).non_error_value();
1214
1215 if (t1 != t2) {
1216 // Not the same entry type so there is nothing else to check. Note
1217 // that this style of checking will consider resolved/unresolved
1218 // class pairs as different.
1219 // From the ConstantPool* API point of view, this is correct
1220 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1221 // plays out in the context of ConstantPool* merging.
1222 return false;
1223 }
1224
1225 switch (t1) {
1226 case JVM_CONSTANT_Class:
1227 {
1228 Klass* k1 = klass_at(index1, CHECK_false);
1229 Klass* k2 = cp2->klass_at(index2, CHECK_false);
1230 if (k1 == k2) {
1231 return true;
1232 }
1233 } break;
1234
1235 case JVM_CONSTANT_ClassIndex:
1236 {
1237 int recur1 = klass_index_at(index1);
1238 int recur2 = cp2->klass_index_at(index2);
1239 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1240 if (match) {
1241 return true;
1242 }
1243 } break;
1244
1245 case JVM_CONSTANT_Double:
1246 {
1247 jdouble d1 = double_at(index1);
1248 jdouble d2 = cp2->double_at(index2);
1249 if (d1 == d2) {
1250 return true;
1251 }
1252 } break;
1253
1254 case JVM_CONSTANT_Fieldref:
1255 case JVM_CONSTANT_InterfaceMethodref:
1256 case JVM_CONSTANT_Methodref:
1257 {
1258 int recur1 = uncached_klass_ref_index_at(index1);
1259 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1260 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1261 if (match) {
1262 recur1 = uncached_name_and_type_ref_index_at(index1);
1263 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1264 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1265 if (match) {
1266 return true;
1267 }
1268 }
1269 } break;
1270
1271 case JVM_CONSTANT_Float:
1272 {
1273 jfloat f1 = float_at(index1);
1274 jfloat f2 = cp2->float_at(index2);
1275 if (f1 == f2) {
1276 return true;
1277 }
1278 } break;
1279
1280 case JVM_CONSTANT_Integer:
1281 {
1282 jint i1 = int_at(index1);
1283 jint i2 = cp2->int_at(index2);
1284 if (i1 == i2) {
1285 return true;
1286 }
1287 } break;
1288
1289 case JVM_CONSTANT_Long:
1290 {
1291 jlong l1 = long_at(index1);
1292 jlong l2 = cp2->long_at(index2);
1293 if (l1 == l2) {
1294 return true;
1295 }
1296 } break;
1297
1298 case JVM_CONSTANT_NameAndType:
1299 {
1300 int recur1 = name_ref_index_at(index1);
1301 int recur2 = cp2->name_ref_index_at(index2);
1302 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1303 if (match) {
1304 recur1 = signature_ref_index_at(index1);
1305 recur2 = cp2->signature_ref_index_at(index2);
1306 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1307 if (match) {
1308 return true;
1309 }
1310 }
1311 } break;
1312
1313 case JVM_CONSTANT_StringIndex:
1314 {
1315 int recur1 = string_index_at(index1);
1316 int recur2 = cp2->string_index_at(index2);
1317 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1318 if (match) {
1319 return true;
1320 }
1321 } break;
1322
1323 case JVM_CONSTANT_UnresolvedClass:
1324 {
1325 Symbol* k1 = klass_name_at(index1);
1326 Symbol* k2 = cp2->klass_name_at(index2);
1327 if (k1 == k2) {
1328 return true;
1329 }
1330 } break;
1331
1332 case JVM_CONSTANT_MethodType:
1333 {
1334 int k1 = method_type_index_at(index1);
1335 int k2 = cp2->method_type_index_at(index2);
1336 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1337 if (match) {
1338 return true;
1339 }
1340 } break;
1341
1342 case JVM_CONSTANT_MethodHandle:
1343 {
1344 int k1 = method_handle_ref_kind_at(index1);
1345 int k2 = cp2->method_handle_ref_kind_at(index2);
1346 if (k1 == k2) {
1347 int i1 = method_handle_index_at(index1);
1348 int i2 = cp2->method_handle_index_at(index2);
1349 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1350 if (match) {
1351 return true;
1352 }
1353 }
1354 } break;
1355
1356 case JVM_CONSTANT_Dynamic:
1357 {
1358 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1359 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1360 int i1 = bootstrap_methods_attribute_index(index1);
1361 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1362 // separate statements and variables because CHECK_false is used
1363 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1364 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1365 return (match_entry && match_operand);
1366 } break;
1367
1368 case JVM_CONSTANT_InvokeDynamic:
1369 {
1370 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1371 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1372 int i1 = bootstrap_methods_attribute_index(index1);
1373 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1374 // separate statements and variables because CHECK_false is used
1375 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1376 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1377 return (match_entry && match_operand);
1378 } break;
1379
1380 case JVM_CONSTANT_String:
1381 {
1382 Symbol* s1 = unresolved_string_at(index1);
1383 Symbol* s2 = cp2->unresolved_string_at(index2);
1384 if (s1 == s2) {
1385 return true;
1386 }
1387 } break;
1388
1389 case JVM_CONSTANT_Utf8:
1390 {
1391 Symbol* s1 = symbol_at(index1);
1392 Symbol* s2 = cp2->symbol_at(index2);
1393 if (s1 == s2) {
1394 return true;
1395 }
1396 } break;
1397
1398 // Invalid is used as the tag for the second constant pool entry
1399 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1400 // not be seen by itself.
1401 case JVM_CONSTANT_Invalid: // fall through
1402
1403 default:
1404 ShouldNotReachHere();
1405 break;
1406 }
1407
1408 return false;
1409 } // end compare_entry_to()
1410
1411
1412 // Resize the operands array with delta_len and delta_size.
1413 // Used in RedefineClasses for CP merge.
1414 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1415 int old_len = operand_array_length(operands());
1416 int new_len = old_len + delta_len;
1417 int min_len = (delta_len > 0) ? old_len : new_len;
1418
1419 int old_size = operands()->length();
1420 int new_size = old_size + delta_size;
1421 int min_size = (delta_size > 0) ? old_size : new_size;
1422
1423 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1424 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1425
1426 // Set index in the resized array for existing elements only
1427 for (int idx = 0; idx < min_len; idx++) {
1428 int offset = operand_offset_at(idx); // offset in original array
1429 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1430 }
1431 // Copy the bootstrap specifiers only
1432 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1433 new_ops->adr_at(2*new_len),
1434 (min_size - 2*min_len) * sizeof(u2));
1435 // Explicitly deallocate old operands array.
1436 // Note, it is not needed for 7u backport.
1437 if ( operands() != NULL) { // the safety check
1438 MetadataFactory::free_array<u2>(loader_data, operands());
1439 }
1440 set_operands(new_ops);
1441 } // end resize_operands()
1442
1443
1444 // Extend the operands array with the length and size of the ext_cp operands.
1445 // Used in RedefineClasses for CP merge.
1446 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1447 int delta_len = operand_array_length(ext_cp->operands());
1448 if (delta_len == 0) {
1449 return; // nothing to do
1450 }
1451 int delta_size = ext_cp->operands()->length();
1452
1453 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1454
1455 if (operand_array_length(operands()) == 0) {
1456 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1457 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1458 // The first element index defines the offset of second part
1459 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1460 set_operands(new_ops);
1461 } else {
1462 resize_operands(delta_len, delta_size, CHECK);
1463 }
1464
1465 } // end extend_operands()
1466
1467
1468 // Shrink the operands array to a smaller array with new_len length.
1469 // Used in RedefineClasses for CP merge.
1470 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1471 int old_len = operand_array_length(operands());
1472 if (new_len == old_len) {
1473 return; // nothing to do
1474 }
1475 assert(new_len < old_len, "shrunken operands array must be smaller");
1476
1477 int free_base = operand_next_offset_at(new_len - 1);
1478 int delta_len = new_len - old_len;
1479 int delta_size = 2*delta_len + free_base - operands()->length();
1480
1481 resize_operands(delta_len, delta_size, CHECK);
1482
1483 } // end shrink_operands()
1484
1485
1486 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1487 const constantPoolHandle& to_cp,
1488 TRAPS) {
1489
1490 int from_oplen = operand_array_length(from_cp->operands());
1491 int old_oplen = operand_array_length(to_cp->operands());
1492 if (from_oplen != 0) {
1493 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1494 // append my operands to the target's operands array
1495 if (old_oplen == 0) {
1496 // Can't just reuse from_cp's operand list because of deallocation issues
1497 int len = from_cp->operands()->length();
1498 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1499 Copy::conjoint_memory_atomic(
1500 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1501 to_cp->set_operands(new_ops);
1502 } else {
1503 int old_len = to_cp->operands()->length();
1504 int from_len = from_cp->operands()->length();
1505 int old_off = old_oplen * sizeof(u2);
1506 int from_off = from_oplen * sizeof(u2);
1507 // Use the metaspace for the destination constant pool
1508 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1509 int fillp = 0, len = 0;
1510 // first part of dest
1511 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1512 new_operands->adr_at(fillp),
1513 (len = old_off) * sizeof(u2));
1514 fillp += len;
1515 // first part of src
1516 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1517 new_operands->adr_at(fillp),
1518 (len = from_off) * sizeof(u2));
1519 fillp += len;
1520 // second part of dest
1521 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1522 new_operands->adr_at(fillp),
1523 (len = old_len - old_off) * sizeof(u2));
1524 fillp += len;
1525 // second part of src
1526 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1527 new_operands->adr_at(fillp),
1528 (len = from_len - from_off) * sizeof(u2));
1529 fillp += len;
1530 assert(fillp == new_operands->length(), "");
1531
1532 // Adjust indexes in the first part of the copied operands array.
1533 for (int j = 0; j < from_oplen; j++) {
1534 int offset = operand_offset_at(new_operands, old_oplen + j);
1535 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1536 offset += old_len; // every new tuple is preceded by old_len extra u2's
1537 operand_offset_at_put(new_operands, old_oplen + j, offset);
1538 }
1539
1540 // replace target operands array with combined array
1541 to_cp->set_operands(new_operands);
1542 }
1543 }
1544 } // end copy_operands()
1545
1546
1547 // Copy this constant pool's entries at start_i to end_i (inclusive)
1548 // to the constant pool to_cp's entries starting at to_i. A total of
1549 // (end_i - start_i) + 1 entries are copied.
1550 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1551 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1552
1553
1554 int dest_i = to_i; // leave original alone for debug purposes
1555
1556 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1557 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1558
1559 switch (from_cp->tag_at(src_i).value()) {
1560 case JVM_CONSTANT_Double:
1561 case JVM_CONSTANT_Long:
1562 // double and long take two constant pool entries
1563 src_i += 2;
1564 dest_i += 2;
1565 break;
1566
1567 default:
1568 // all others take one constant pool entry
1569 src_i++;
1570 dest_i++;
1571 break;
1572 }
1573 }
1574 copy_operands(from_cp, to_cp, CHECK);
1575
1576 } // end copy_cp_to_impl()
1577
1578
1579 // Copy this constant pool's entry at from_i to the constant pool
1580 // to_cp's entry at to_i.
1581 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1582 const constantPoolHandle& to_cp, int to_i,
1583 TRAPS) {
1584
1585 int tag = from_cp->tag_at(from_i).value();
1586 switch (tag) {
1587 case JVM_CONSTANT_ClassIndex:
1588 {
1589 jint ki = from_cp->klass_index_at(from_i);
1590 to_cp->klass_index_at_put(to_i, ki);
1591 } break;
1592
1593 case JVM_CONSTANT_Double:
1594 {
1595 jdouble d = from_cp->double_at(from_i);
1596 to_cp->double_at_put(to_i, d);
1597 // double takes two constant pool entries so init second entry's tag
1598 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1599 } break;
1600
1601 case JVM_CONSTANT_Fieldref:
1602 {
1603 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1604 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1605 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1606 } break;
1607
1608 case JVM_CONSTANT_Float:
1609 {
1610 jfloat f = from_cp->float_at(from_i);
1611 to_cp->float_at_put(to_i, f);
1612 } break;
1613
1614 case JVM_CONSTANT_Integer:
1615 {
1616 jint i = from_cp->int_at(from_i);
1617 to_cp->int_at_put(to_i, i);
1618 } break;
1619
1620 case JVM_CONSTANT_InterfaceMethodref:
1621 {
1622 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1623 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1624 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1625 } break;
1626
1627 case JVM_CONSTANT_Long:
1628 {
1629 jlong l = from_cp->long_at(from_i);
1630 to_cp->long_at_put(to_i, l);
1631 // long takes two constant pool entries so init second entry's tag
1632 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1633 } break;
1634
1635 case JVM_CONSTANT_Methodref:
1636 {
1637 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1638 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1639 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1640 } break;
1641
1642 case JVM_CONSTANT_NameAndType:
1643 {
1644 int name_ref_index = from_cp->name_ref_index_at(from_i);
1645 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1646 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1647 } break;
1648
1649 case JVM_CONSTANT_StringIndex:
1650 {
1651 jint si = from_cp->string_index_at(from_i);
1652 to_cp->string_index_at_put(to_i, si);
1653 } break;
1654
1655 case JVM_CONSTANT_Class:
1656 case JVM_CONSTANT_UnresolvedClass:
1657 case JVM_CONSTANT_UnresolvedClassInError:
1658 {
1659 // Revert to JVM_CONSTANT_ClassIndex
1660 int name_index = from_cp->klass_slot_at(from_i).name_index();
1661 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1662 to_cp->klass_index_at_put(to_i, name_index);
1663 } break;
1664
1665 case JVM_CONSTANT_String:
1666 {
1667 Symbol* s = from_cp->unresolved_string_at(from_i);
1668 to_cp->unresolved_string_at_put(to_i, s);
1669 } break;
1670
1671 case JVM_CONSTANT_Utf8:
1672 {
1673 Symbol* s = from_cp->symbol_at(from_i);
1674 // Need to increase refcount, the old one will be thrown away and deferenced
1675 s->increment_refcount();
1676 to_cp->symbol_at_put(to_i, s);
1677 } break;
1678
1679 case JVM_CONSTANT_MethodType:
1680 case JVM_CONSTANT_MethodTypeInError:
1681 {
1682 jint k = from_cp->method_type_index_at(from_i);
1683 to_cp->method_type_index_at_put(to_i, k);
1684 } break;
1685
1686 case JVM_CONSTANT_MethodHandle:
1687 case JVM_CONSTANT_MethodHandleInError:
1688 {
1689 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1690 int k2 = from_cp->method_handle_index_at(from_i);
1691 to_cp->method_handle_index_at_put(to_i, k1, k2);
1692 } break;
1693
1694 case JVM_CONSTANT_Dynamic:
1695 case JVM_CONSTANT_DynamicInError:
1696 {
1697 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1698 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1699 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1700 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1701 } break;
1702
1703 case JVM_CONSTANT_InvokeDynamic:
1704 {
1705 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1706 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1707 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1708 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1709 } break;
1710
1711 // Invalid is used as the tag for the second constant pool entry
1712 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1713 // not be seen by itself.
1714 case JVM_CONSTANT_Invalid: // fall through
1715
1716 default:
1717 {
1718 ShouldNotReachHere();
1719 } break;
1720 }
1721 } // end copy_entry_to()
1722
1723 // Search constant pool search_cp for an entry that matches this
1724 // constant pool's entry at pattern_i. Returns the index of a
1725 // matching entry or zero (0) if there is no matching entry.
1726 int ConstantPool::find_matching_entry(int pattern_i,
1727 const constantPoolHandle& search_cp, TRAPS) {
1728
1729 // index zero (0) is not used
1730 for (int i = 1; i < search_cp->length(); i++) {
1731 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1732 if (found) {
1733 return i;
1734 }
1735 }
1736
1737 return 0; // entry not found; return unused index zero (0)
1738 } // end find_matching_entry()
1739
1740
1741 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1742 // cp2's bootstrap specifier at idx2.
1743 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1744 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1745 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1746 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1747
1748 if (!match) {
1749 return false;
1750 }
1751 int argc = operand_argument_count_at(idx1);
1752 if (argc == cp2->operand_argument_count_at(idx2)) {
1753 for (int j = 0; j < argc; j++) {
1754 k1 = operand_argument_index_at(idx1, j);
1755 k2 = cp2->operand_argument_index_at(idx2, j);
1756 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1757 if (!match) {
1758 return false;
1759 }
1760 }
1761 return true; // got through loop; all elements equal
1762 }
1763 return false;
1764 } // end compare_operand_to()
1765
1766 // Search constant pool search_cp for a bootstrap specifier that matches
1767 // this constant pool's bootstrap specifier data at pattern_i index.
1768 // Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1769 int ConstantPool::find_matching_operand(int pattern_i,
1770 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1771 for (int i = 0; i < search_len; i++) {
1772 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1773 if (found) {
1774 return i;
1775 }
1776 }
1777 return -1; // bootstrap specifier data not found; return unused index (-1)
1778 } // end find_matching_operand()
1779
1780
1781 #ifndef PRODUCT
1782
1783 const char* ConstantPool::printable_name_at(int which) {
1784
1785 constantTag tag = tag_at(which);
1786
1787 if (tag.is_string()) {
1788 return string_at_noresolve(which);
1789 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1790 return klass_name_at(which)->as_C_string();
1791 } else if (tag.is_symbol()) {
1792 return symbol_at(which)->as_C_string();
1793 }
1794 return "";
1795 }
1796
1797 #endif // PRODUCT
1798
1799
1800 // JVMTI GetConstantPool support
1801
1802 // For debugging of constant pool
1803 const bool debug_cpool = false;
1804
1805 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1806
1807 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1808 const char* WARN_MSG = "Must not be such entry!";
1809 jint size = 0;
1810 u2 idx1, idx2;
1811
1812 for (jint idx = 1; idx < cnt; idx++) {
1813 jint ent_size = 0;
1814 u1 tag = *bytes++;
1815 size++; // count tag
1816
1817 printf("const #%03d, tag: %02d ", idx, tag);
1818 switch(tag) {
1819 case JVM_CONSTANT_Invalid: {
1820 printf("Invalid");
1821 break;
1822 }
1823 case JVM_CONSTANT_Unicode: {
1824 printf("Unicode %s", WARN_MSG);
1825 break;
1826 }
1827 case JVM_CONSTANT_Utf8: {
1828 u2 len = Bytes::get_Java_u2(bytes);
1829 char str[128];
1830 if (len > 127) {
1831 len = 127;
1832 }
1833 strncpy(str, (char *) (bytes+2), len);
1834 str[len] = '\0';
1835 printf("Utf8 \"%s\"", str);
1836 ent_size = 2 + len;
1837 break;
1838 }
1839 case JVM_CONSTANT_Integer: {
1840 u4 val = Bytes::get_Java_u4(bytes);
1841 printf("int %d", *(int *) &val);
1842 ent_size = 4;
1843 break;
1844 }
1845 case JVM_CONSTANT_Float: {
1846 u4 val = Bytes::get_Java_u4(bytes);
1847 printf("float %5.3ff", *(float *) &val);
1848 ent_size = 4;
1849 break;
1850 }
1851 case JVM_CONSTANT_Long: {
1852 u8 val = Bytes::get_Java_u8(bytes);
1853 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1854 ent_size = 8;
1855 idx++; // Long takes two cpool slots
1856 break;
1857 }
1858 case JVM_CONSTANT_Double: {
1859 u8 val = Bytes::get_Java_u8(bytes);
1860 printf("double %5.3fd", *(jdouble *)&val);
1861 ent_size = 8;
1862 idx++; // Double takes two cpool slots
1863 break;
1864 }
1865 case JVM_CONSTANT_Class: {
1866 idx1 = Bytes::get_Java_u2(bytes);
1867 printf("class #%03d", idx1);
1868 ent_size = 2;
1869 break;
1870 }
1871 case JVM_CONSTANT_String: {
1872 idx1 = Bytes::get_Java_u2(bytes);
1873 printf("String #%03d", idx1);
1874 ent_size = 2;
1875 break;
1876 }
1877 case JVM_CONSTANT_Fieldref: {
1878 idx1 = Bytes::get_Java_u2(bytes);
1879 idx2 = Bytes::get_Java_u2(bytes+2);
1880 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1881 ent_size = 4;
1882 break;
1883 }
1884 case JVM_CONSTANT_Methodref: {
1885 idx1 = Bytes::get_Java_u2(bytes);
1886 idx2 = Bytes::get_Java_u2(bytes+2);
1887 printf("Method #%03d, #%03d", idx1, idx2);
1888 ent_size = 4;
1889 break;
1890 }
1891 case JVM_CONSTANT_InterfaceMethodref: {
1892 idx1 = Bytes::get_Java_u2(bytes);
1893 idx2 = Bytes::get_Java_u2(bytes+2);
1894 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1895 ent_size = 4;
1896 break;
1897 }
1898 case JVM_CONSTANT_NameAndType: {
1899 idx1 = Bytes::get_Java_u2(bytes);
1900 idx2 = Bytes::get_Java_u2(bytes+2);
1901 printf("NameAndType #%03d, #%03d", idx1, idx2);
1902 ent_size = 4;
1903 break;
1904 }
1905 case JVM_CONSTANT_ClassIndex: {
1906 printf("ClassIndex %s", WARN_MSG);
1907 break;
1908 }
1909 case JVM_CONSTANT_UnresolvedClass: {
1910 printf("UnresolvedClass: %s", WARN_MSG);
1911 break;
1912 }
1913 case JVM_CONSTANT_UnresolvedClassInError: {
1914 printf("UnresolvedClassInErr: %s", WARN_MSG);
1915 break;
1916 }
1917 case JVM_CONSTANT_StringIndex: {
1918 printf("StringIndex: %s", WARN_MSG);
1919 break;
1920 }
1921 }
1922 printf(";\n");
1923 bytes += ent_size;
1924 size += ent_size;
1925 }
1926 printf("Cpool size: %d\n", size);
1927 fflush(0);
1928 return;
1929 } /* end print_cpool_bytes */
1930
1931
1932 // Returns size of constant pool entry.
1933 jint ConstantPool::cpool_entry_size(jint idx) {
1934 switch(tag_at(idx).value()) {
1935 case JVM_CONSTANT_Invalid:
1936 case JVM_CONSTANT_Unicode:
1937 return 1;
1938
1939 case JVM_CONSTANT_Utf8:
1940 return 3 + symbol_at(idx)->utf8_length();
1941
1942 case JVM_CONSTANT_Class:
1943 case JVM_CONSTANT_String:
1944 case JVM_CONSTANT_ClassIndex:
1945 case JVM_CONSTANT_UnresolvedClass:
1946 case JVM_CONSTANT_UnresolvedClassInError:
1947 case JVM_CONSTANT_StringIndex:
1948 case JVM_CONSTANT_MethodType:
1949 case JVM_CONSTANT_MethodTypeInError:
1950 return 3;
1951
1952 case JVM_CONSTANT_MethodHandle:
1953 case JVM_CONSTANT_MethodHandleInError:
1954 return 4; //tag, ref_kind, ref_index
1955
1956 case JVM_CONSTANT_Integer:
1957 case JVM_CONSTANT_Float:
1958 case JVM_CONSTANT_Fieldref:
1959 case JVM_CONSTANT_Methodref:
1960 case JVM_CONSTANT_InterfaceMethodref:
1961 case JVM_CONSTANT_NameAndType:
1962 return 5;
1963
1964 case JVM_CONSTANT_Dynamic:
1965 case JVM_CONSTANT_DynamicInError:
1966 case JVM_CONSTANT_InvokeDynamic:
1967 // u1 tag, u2 bsm, u2 nt
1968 return 5;
1969
1970 case JVM_CONSTANT_Long:
1971 case JVM_CONSTANT_Double:
1972 return 9;
1973 }
1974 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1975 return 1;
1976 } /* end cpool_entry_size */
1977
1978
1979 // SymbolHashMap is used to find a constant pool index from a string.
1980 // This function fills in SymbolHashMaps, one for utf8s and one for
1981 // class names, returns size of the cpool raw bytes.
1982 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1983 SymbolHashMap *classmap) {
1984 jint size = 0;
1985
1986 for (u2 idx = 1; idx < length(); idx++) {
1987 u2 tag = tag_at(idx).value();
1988 size += cpool_entry_size(idx);
1989
1990 switch(tag) {
1991 case JVM_CONSTANT_Utf8: {
1992 Symbol* sym = symbol_at(idx);
1993 symmap->add_entry(sym, idx);
1994 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1995 break;
1996 }
1997 case JVM_CONSTANT_Class:
1998 case JVM_CONSTANT_UnresolvedClass:
1999 case JVM_CONSTANT_UnresolvedClassInError: {
2000 Symbol* sym = klass_name_at(idx);
2001 classmap->add_entry(sym, idx);
2002 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
2003 break;
2004 }
2005 case JVM_CONSTANT_Long:
2006 case JVM_CONSTANT_Double: {
2007 idx++; // Both Long and Double take two cpool slots
2008 break;
2009 }
2010 }
2011 }
2012 return size;
2013 } /* end hash_utf8_entries_to */
2014
2015
2016 // Copy cpool bytes.
2017 // Returns:
2018 // 0, in case of OutOfMemoryError
2019 // -1, in case of internal error
2020 // > 0, count of the raw cpool bytes that have been copied
2021 int ConstantPool::copy_cpool_bytes(int cpool_size,
2022 SymbolHashMap* tbl,
2023 unsigned char *bytes) {
2024 u2 idx1, idx2;
2025 jint size = 0;
2026 jint cnt = length();
2027 unsigned char *start_bytes = bytes;
2028
2029 for (jint idx = 1; idx < cnt; idx++) {
2030 u1 tag = tag_at(idx).value();
2031 jint ent_size = cpool_entry_size(idx);
2032
2033 assert(size + ent_size <= cpool_size, "Size mismatch");
2034
2035 *bytes = tag;
2036 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2037 switch(tag) {
2038 case JVM_CONSTANT_Invalid: {
2039 DBG(printf("JVM_CONSTANT_Invalid"));
2040 break;
2041 }
2042 case JVM_CONSTANT_Unicode: {
2043 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2044 DBG(printf("JVM_CONSTANT_Unicode"));
2045 break;
2046 }
2047 case JVM_CONSTANT_Utf8: {
2048 Symbol* sym = symbol_at(idx);
2049 char* str = sym->as_utf8();
2050 // Warning! It's crashing on x86 with len = sym->utf8_length()
2051 int len = (int) strlen(str);
2052 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2053 for (int i = 0; i < len; i++) {
2054 bytes[3+i] = (u1) str[i];
2055 }
2056 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2057 break;
2058 }
2059 case JVM_CONSTANT_Integer: {
2060 jint val = int_at(idx);
2061 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2062 break;
2063 }
2064 case JVM_CONSTANT_Float: {
2065 jfloat val = float_at(idx);
2066 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2067 break;
2068 }
2069 case JVM_CONSTANT_Long: {
2070 jlong val = long_at(idx);
2071 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2072 idx++; // Long takes two cpool slots
2073 break;
2074 }
2075 case JVM_CONSTANT_Double: {
2076 jdouble val = double_at(idx);
2077 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2078 idx++; // Double takes two cpool slots
2079 break;
2080 }
2081 case JVM_CONSTANT_Class:
2082 case JVM_CONSTANT_UnresolvedClass:
2083 case JVM_CONSTANT_UnresolvedClassInError: {
2084 *bytes = JVM_CONSTANT_Class;
2085 Symbol* sym = klass_name_at(idx);
2086 idx1 = tbl->symbol_to_value(sym);
2087 assert(idx1 != 0, "Have not found a hashtable entry");
2088 Bytes::put_Java_u2((address) (bytes+1), idx1);
2089 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2090 break;
2091 }
2092 case JVM_CONSTANT_String: {
2093 *bytes = JVM_CONSTANT_String;
2094 Symbol* sym = unresolved_string_at(idx);
2095 idx1 = tbl->symbol_to_value(sym);
2096 assert(idx1 != 0, "Have not found a hashtable entry");
2097 Bytes::put_Java_u2((address) (bytes+1), idx1);
2098 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2099 break;
2100 }
2101 case JVM_CONSTANT_Fieldref:
2102 case JVM_CONSTANT_Methodref:
2103 case JVM_CONSTANT_InterfaceMethodref: {
2104 idx1 = uncached_klass_ref_index_at(idx);
2105 idx2 = uncached_name_and_type_ref_index_at(idx);
2106 Bytes::put_Java_u2((address) (bytes+1), idx1);
2107 Bytes::put_Java_u2((address) (bytes+3), idx2);
2108 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2109 break;
2110 }
2111 case JVM_CONSTANT_NameAndType: {
2112 idx1 = name_ref_index_at(idx);
2113 idx2 = signature_ref_index_at(idx);
2114 Bytes::put_Java_u2((address) (bytes+1), idx1);
2115 Bytes::put_Java_u2((address) (bytes+3), idx2);
2116 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2117 break;
2118 }
2119 case JVM_CONSTANT_ClassIndex: {
2120 *bytes = JVM_CONSTANT_Class;
2121 idx1 = klass_index_at(idx);
2122 Bytes::put_Java_u2((address) (bytes+1), idx1);
2123 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2124 break;
2125 }
2126 case JVM_CONSTANT_StringIndex: {
2127 *bytes = JVM_CONSTANT_String;
2128 idx1 = string_index_at(idx);
2129 Bytes::put_Java_u2((address) (bytes+1), idx1);
2130 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2131 break;
2132 }
2133 case JVM_CONSTANT_MethodHandle:
2134 case JVM_CONSTANT_MethodHandleInError: {
2135 *bytes = JVM_CONSTANT_MethodHandle;
2136 int kind = method_handle_ref_kind_at(idx);
2137 idx1 = method_handle_index_at(idx);
2138 *(bytes+1) = (unsigned char) kind;
2139 Bytes::put_Java_u2((address) (bytes+2), idx1);
2140 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2141 break;
2142 }
2143 case JVM_CONSTANT_MethodType:
2144 case JVM_CONSTANT_MethodTypeInError: {
2145 *bytes = JVM_CONSTANT_MethodType;
2146 idx1 = method_type_index_at(idx);
2147 Bytes::put_Java_u2((address) (bytes+1), idx1);
2148 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2149 break;
2150 }
2151 case JVM_CONSTANT_Dynamic:
2152 case JVM_CONSTANT_DynamicInError: {
2153 *bytes = tag;
2154 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2155 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2156 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2157 Bytes::put_Java_u2((address) (bytes+1), idx1);
2158 Bytes::put_Java_u2((address) (bytes+3), idx2);
2159 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2160 break;
2161 }
2162 case JVM_CONSTANT_InvokeDynamic: {
2163 *bytes = tag;
2164 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2165 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2166 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2167 Bytes::put_Java_u2((address) (bytes+1), idx1);
2168 Bytes::put_Java_u2((address) (bytes+3), idx2);
2169 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2170 break;
2171 }
2172 }
2173 DBG(printf("\n"));
2174 bytes += ent_size;
2175 size += ent_size;
2176 }
2177 assert(size == cpool_size, "Size mismatch");
2178
2179 // Keep temorarily for debugging until it's stable.
2180 DBG(print_cpool_bytes(cnt, start_bytes));
2181 return (int)(bytes - start_bytes);
2182 } /* end copy_cpool_bytes */
2183
2184 #undef DBG
2185
2186
2187 void ConstantPool::set_on_stack(const bool value) {
2188 if (value) {
2189 // Only record if it's not already set.
2190 if (!on_stack()) {
2191 assert(!is_shared(), "should always be set for shared constant pools");
2192 _flags |= _on_stack;
2193 MetadataOnStackMark::record(this);
2194 }
2195 } else {
2196 // Clearing is done single-threadedly.
2197 if (!is_shared()) {
2198 _flags &= ~_on_stack;
2199 }
2200 }
2201 }
2202
2203 // JSR 292 support for patching constant pool oops after the class is linked and
2204 // the oop array for resolved references are created.
2205 // We can't do this during classfile parsing, which is how the other indexes are
2206 // patched. The other patches are applied early for some error checking
2207 // so only defer the pseudo_strings.
2208 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
2209 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
2210 Handle patch = cp_patches->at(index);
2211 if (patch.not_null()) {
2212 assert (tag_at(index).is_string(), "should only be string left");
2213 // Patching a string means pre-resolving it.
2214 // The spelling in the constant pool is ignored.
2215 // The constant reference may be any object whatever.
2216 // If it is not a real interned string, the constant is referred
2217 // to as a "pseudo-string", and must be presented to the CP
2218 // explicitly, because it may require scavenging.
2219 int obj_index = cp_to_object_index(index);
2220 pseudo_string_at_put(index, obj_index, patch());
2221 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
2222 }
2223 }
2224 #ifdef ASSERT
2225 // Ensure that all the patches have been used.
2226 for (int index = 0; index < cp_patches->length(); index++) {
2227 assert(cp_patches->at(index).is_null(),
2228 "Unused constant pool patch at %d in class file %s",
2229 index,
2230 pool_holder()->external_name());
2231 }
2232 #endif // ASSERT
2233 }
2234
2235 // Printing
2236
2237 void ConstantPool::print_on(outputStream* st) const {
2238 assert(is_constantPool(), "must be constantPool");
2239 st->print_cr("%s", internal_name());
2240 if (flags() != 0) {
2241 st->print(" - flags: 0x%x", flags());
2242 if (has_preresolution()) st->print(" has_preresolution");
2243 if (on_stack()) st->print(" on_stack");
2244 st->cr();
2245 }
2246 if (pool_holder() != NULL) {
2247 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
2248 }
2249 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
2250 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
2251 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
2252 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
2253
2254 for (int index = 1; index < length(); index++) { // Index 0 is unused
2255 ((ConstantPool*)this)->print_entry_on(index, st);
2256 switch (tag_at(index).value()) {
2257 case JVM_CONSTANT_Long :
2258 case JVM_CONSTANT_Double :
2259 index++; // Skip entry following eigth-byte constant
2260 }
2261
2262 }
2263 st->cr();
2264 }
2265
2266 // Print one constant pool entry
2267 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2268 EXCEPTION_MARK;
2269 st->print(" - %3d : ", index);
2270 tag_at(index).print_on(st);
2271 st->print(" : ");
2272 switch (tag_at(index).value()) {
2273 case JVM_CONSTANT_Class :
2274 { Klass* k = klass_at(index, CATCH);
2275 guarantee(k != NULL, "need klass");
2276 k->print_value_on(st);
2277 st->print(" {" PTR_FORMAT "}", p2i(k));
2278 }
2279 break;
2280 case JVM_CONSTANT_Fieldref :
2281 case JVM_CONSTANT_Methodref :
2282 case JVM_CONSTANT_InterfaceMethodref :
2283 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2284 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2285 break;
2286 case JVM_CONSTANT_String :
2287 if (is_pseudo_string_at(index)) {
2288 oop anObj = pseudo_string_at(index);
2289 anObj->print_value_on(st);
2290 st->print(" {" PTR_FORMAT "}", p2i(anObj));
2291 } else {
2292 unresolved_string_at(index)->print_value_on(st);
2293 }
2294 break;
2295 case JVM_CONSTANT_Integer :
2296 st->print("%d", int_at(index));
2297 break;
2298 case JVM_CONSTANT_Float :
2299 st->print("%f", float_at(index));
2300 break;
2301 case JVM_CONSTANT_Long :
2302 st->print_jlong(long_at(index));
2303 break;
2304 case JVM_CONSTANT_Double :
2305 st->print("%lf", double_at(index));
2306 break;
2307 case JVM_CONSTANT_NameAndType :
2308 st->print("name_index=%d", name_ref_index_at(index));
2309 st->print(" signature_index=%d", signature_ref_index_at(index));
2310 break;
2311 case JVM_CONSTANT_Utf8 :
2312 symbol_at(index)->print_value_on(st);
2313 break;
2314 case JVM_CONSTANT_ClassIndex: {
2315 int name_index = *int_at_addr(index);
2316 st->print("klass_index=%d ", name_index);
2317 symbol_at(name_index)->print_value_on(st);
2318 }
2319 break;
2320 case JVM_CONSTANT_UnresolvedClass : // fall-through
2321 case JVM_CONSTANT_UnresolvedClassInError: {
2322 CPKlassSlot kslot = klass_slot_at(index);
2323 int resolved_klass_index = kslot.resolved_klass_index();
2324 int name_index = kslot.name_index();
2325 assert(tag_at(name_index).is_symbol(), "sanity");
2326
2327 Klass* klass = resolved_klasses()->at(resolved_klass_index);
2328 if (klass != NULL) {
2329 klass->print_value_on(st);
2330 } else {
2331 symbol_at(name_index)->print_value_on(st);
2332 }
2333 }
2334 break;
2335 case JVM_CONSTANT_MethodHandle :
2336 case JVM_CONSTANT_MethodHandleInError :
2337 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2338 st->print(" ref_index=%d", method_handle_index_at(index));
2339 break;
2340 case JVM_CONSTANT_MethodType :
2341 case JVM_CONSTANT_MethodTypeInError :
2342 st->print("signature_index=%d", method_type_index_at(index));
2343 break;
2344 case JVM_CONSTANT_Dynamic :
2345 case JVM_CONSTANT_DynamicInError :
2346 {
2347 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2348 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2349 int argc = bootstrap_argument_count_at(index);
2350 if (argc > 0) {
2351 for (int arg_i = 0; arg_i < argc; arg_i++) {
2352 int arg = bootstrap_argument_index_at(index, arg_i);
2353 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2354 }
2355 st->print("}");
2356 }
2357 }
2358 break;
2359 case JVM_CONSTANT_InvokeDynamic :
2360 {
2361 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2362 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2363 int argc = bootstrap_argument_count_at(index);
2364 if (argc > 0) {
2365 for (int arg_i = 0; arg_i < argc; arg_i++) {
2366 int arg = bootstrap_argument_index_at(index, arg_i);
2367 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2368 }
2369 st->print("}");
2370 }
2371 }
2372 break;
2373 default:
2374 ShouldNotReachHere();
2375 break;
2376 }
2377 st->cr();
2378 }
2379
2380 void ConstantPool::print_value_on(outputStream* st) const {
2381 assert(is_constantPool(), "must be constantPool");
2382 st->print("constant pool [%d]", length());
2383 if (has_preresolution()) st->print("/preresolution");
2384 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2385 print_address_on(st);
2386 if (pool_holder() != NULL) {
2387 st->print(" for ");
2388 pool_holder()->print_value_on(st);
2389 bool extra = (pool_holder()->constants() != this);
2390 if (extra) st->print(" (extra)");
2391 }
2392 if (cache() != NULL) {
2393 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2394 }
2395 }
2396
2397 // Verification
2398
2399 void ConstantPool::verify_on(outputStream* st) {
2400 guarantee(is_constantPool(), "object must be constant pool");
2401 for (int i = 0; i< length(); i++) {
2402 constantTag tag = tag_at(i);
2403 if (tag.is_klass() || tag.is_unresolved_klass()) {
2404 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2405 } else if (tag.is_symbol()) {
2406 CPSlot entry = slot_at(i);
2407 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2408 } else if (tag.is_string()) {
2409 CPSlot entry = slot_at(i);
2410 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2411 }
2412 }
2413 if (pool_holder() != NULL) {
2414 // Note: pool_holder() can be NULL in temporary constant pools
2415 // used during constant pool merging
2416 guarantee(pool_holder()->is_klass(), "should be klass");
2417 }
2418 }
2419
2420
2421 SymbolHashMap::~SymbolHashMap() {
2422 SymbolHashMapEntry* next;
2423 for (int i = 0; i < _table_size; i++) {
2424 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
2425 next = cur->next();
2426 delete(cur);
2427 }
2428 }
2429 FREE_C_HEAP_ARRAY(SymbolHashMapBucket, _buckets);
2430 }
2431
2432 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2433 char *str = sym->as_utf8();
2434 unsigned int hash = compute_hash(str, sym->utf8_length());
2435 unsigned int index = hash % table_size();
2436
2437 // check if already in map
2438 // we prefer the first entry since it is more likely to be what was used in
2439 // the class file
2440 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2441 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2442 if (en->hash() == hash && en->symbol() == sym) {
2443 return; // already there
2444 }
2445 }
2446
2447 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2448 entry->set_next(bucket(index));
2449 _buckets[index].set_entry(entry);
2450 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2451 }
2452
2453 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2454 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2455 char *str = sym->as_utf8();
2456 int len = sym->utf8_length();
2457 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2458 unsigned int index = hash % table_size();
2459 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2460 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2461 if (en->hash() == hash && en->symbol() == sym) {
2462 return en;
2463 }
2464 }
2465 return NULL;
2466 }
2467
2468 void SymbolHashMap::initialize_table(int table_size) {
2469 _table_size = table_size;
2470 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
2471 for (int index = 0; index < table_size; index++) {
2472 _buckets[index].clear();
2473 }
2474 }