1 /*
2 * Copyright (c) 1997, 2021, 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 "cds/heapShared.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/javaClasses.inline.hpp"
30 #include "classfile/metadataOnStackMark.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmClasses.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "interpreter/bootstrapInfo.hpp"
36 #include "interpreter/linkResolver.hpp"
37 #include "logging/log.hpp"
38 #include "logging/logStream.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/metadataFactory.hpp"
41 #include "memory/metaspaceClosure.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/flatArrayKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/klass.inline.hpp"
51 #include "oops/objArrayKlass.hpp"
52 #include "oops/objArrayOop.inline.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "oops/typeArrayOop.inline.hpp"
55 #include "prims/jvmtiExport.hpp"
56 #include "runtime/atomic.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/init.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/signature.hpp"
61 #include "runtime/thread.inline.hpp"
62 #include "runtime/vframe.inline.hpp"
63 #include "utilities/copy.hpp"
64
65 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
66 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
67 int size = ConstantPool::size(length);
68 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
69 }
70
71 void ConstantPool::copy_fields(const ConstantPool* orig) {
72 // Preserve dynamic constant information from the original pool
73 if (orig->has_dynamic_constant()) {
74 set_has_dynamic_constant();
75 }
76
77 set_major_version(orig->major_version());
78 set_minor_version(orig->minor_version());
79
80 set_source_file_name_index(orig->source_file_name_index());
81 set_generic_signature_index(orig->generic_signature_index());
82 }
83
84 #ifdef ASSERT
85
86 // MetaspaceObj allocation invariant is calloc equivalent memory
87 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
88 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
89 assert(tags != NULL, "invariant");
90 const int length = tags->length();
91 for (int index = 0; index < length; ++index) {
92 if (JVM_CONSTANT_Invalid != tags->at(index)) {
93 return false;
94 }
95 }
96 return true;
97 }
98
99 #endif
100
101 ConstantPool::ConstantPool(Array<u1>* tags) :
102 _tags(tags),
103 _length(tags->length()) {
104
105 assert(_tags != NULL, "invariant");
106 assert(tags->length() == _length, "invariant");
107 assert(tag_array_is_zero_initialized(tags), "invariant");
108 assert(0 == flags(), "invariant");
109 assert(0 == version(), "invariant");
110 assert(NULL == _pool_holder, "invariant");
111 }
112
113 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
114 if (cache() != NULL) {
115 MetadataFactory::free_metadata(loader_data, cache());
116 set_cache(NULL);
117 }
118
119 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
120 set_resolved_klasses(NULL);
121
122 MetadataFactory::free_array<jushort>(loader_data, operands());
123 set_operands(NULL);
124
125 release_C_heap_structures();
126
127 // free tag array
128 MetadataFactory::free_array<u1>(loader_data, tags());
129 set_tags(NULL);
130 }
131
132 void ConstantPool::release_C_heap_structures() {
133 // walk constant pool and decrement symbol reference counts
134 unreference_symbols();
135 }
136
137 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
138 log_trace(cds)("Iter(ConstantPool): %p", this);
139
140 it->push(&_tags, MetaspaceClosure::_writable);
141 it->push(&_cache);
142 it->push(&_pool_holder);
143 it->push(&_operands);
144 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
145
146 for (int i = 0; i < length(); i++) {
147 // The only MSO's embedded in the CP entries are Symbols:
148 // JVM_CONSTANT_String (normal and pseudo)
149 // JVM_CONSTANT_Utf8
150 constantTag ctag = tag_at(i);
151 if (ctag.is_string() || ctag.is_utf8()) {
152 it->push(symbol_at_addr(i));
153 }
154 }
155 }
156
157 objArrayOop ConstantPool::resolved_references() const {
158 return (objArrayOop)_cache->resolved_references();
159 }
160
161 // Called from outside constant pool resolution where a resolved_reference array
162 // may not be present.
163 objArrayOop ConstantPool::resolved_references_or_null() const {
164 if (_cache == NULL) {
165 return NULL;
166 } else {
167 return (objArrayOop)_cache->resolved_references();
168 }
169 }
170
171 // Create resolved_references array and mapping array for original cp indexes
172 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
173 // to map it back for resolving and some unlikely miscellaneous uses.
174 // The objects created by invokedynamic are appended to this list.
175 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
176 const intStack& reference_map,
177 int constant_pool_map_length,
178 TRAPS) {
179 // Initialized the resolved object cache.
180 int map_length = reference_map.length();
181 if (map_length > 0) {
182 // Only need mapping back to constant pool entries. The map isn't used for
183 // invokedynamic resolved_reference entries. For invokedynamic entries,
184 // the constant pool cache index has the mapping back to both the constant
185 // pool and to the resolved reference index.
186 if (constant_pool_map_length > 0) {
187 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
188
189 for (int i = 0; i < constant_pool_map_length; i++) {
190 int x = reference_map.at(i);
191 assert(x == (int)(jushort) x, "klass index is too big");
192 om->at_put(i, (jushort)x);
193 }
194 set_reference_map(om);
195 }
196
197 // Create Java array for holding resolved strings, methodHandles,
198 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
199 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK);
200 Handle refs_handle (THREAD, stom); // must handleize.
201 set_resolved_references(loader_data->add_handle(refs_handle));
202 }
203 }
204
205 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
206 // A ConstantPool can't possibly have 0xffff valid class entries,
207 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
208 // entry for the class's name. So at most we will have 0xfffe class entries.
209 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
210 // UnresolvedKlass entries that are temporarily created during class redefinition.
211 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
212 assert(resolved_klasses() == NULL, "sanity");
213 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
214 set_resolved_klasses(rk);
215 }
216
217 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
218 int len = length();
219 int num_klasses = 0;
220 for (int i = 1; i <len; i++) {
221 switch (tag_at(i).value()) {
222 case JVM_CONSTANT_ClassIndex:
223 {
224 const int class_index = klass_index_at(i);
225 unresolved_klass_at_put(i, class_index, num_klasses++);
226 }
227 break;
228 #ifndef PRODUCT
229 case JVM_CONSTANT_Class:
230 case JVM_CONSTANT_UnresolvedClass:
231 case JVM_CONSTANT_UnresolvedClassInError:
232 // All of these should have been reverted back to Unresolved before calling
233 // this function.
234 ShouldNotReachHere();
235 #endif
236 }
237 }
238 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
239 }
240
241 // Hidden class support:
242 void ConstantPool::klass_at_put(int class_index, Klass* k) {
243 assert(k != NULL, "must be valid klass");
244 CPKlassSlot kslot = klass_slot_at(class_index);
245 int resolved_klass_index = kslot.resolved_klass_index();
246 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
247 Atomic::release_store(adr, k);
248
249 // The interpreter assumes when the tag is stored, the klass is resolved
250 // and the Klass* non-NULL, so we need hardware store ordering here.
251 assert(!k->name()->is_Q_signature(), "Q-type without JVM_CONSTANT_QDescBit");
252 release_tag_at_put(class_index, JVM_CONSTANT_Class);
253 }
254
255 #if INCLUDE_CDS_JAVA_HEAP
256 // Archive the resolved references
257 void ConstantPool::archive_resolved_references() {
258 if (_cache == NULL) {
259 return; // nothing to do
260 }
261
262 InstanceKlass *ik = pool_holder();
263 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() ||
264 ik->is_shared_app_class())) {
265 // Archiving resolved references for classes from non-builtin loaders
266 // is not yet supported.
267 return;
268 }
269
270 objArrayOop rr = resolved_references();
271 Array<u2>* ref_map = reference_map();
272 if (rr != NULL) {
273 int ref_map_len = ref_map == NULL ? 0 : ref_map->length();
274 int rr_len = rr->length();
275 for (int i = 0; i < rr_len; i++) {
276 oop obj = rr->obj_at(i);
277 rr->obj_at_put(i, NULL);
278 if (obj != NULL && i < ref_map_len) {
279 int index = object_to_cp_index(i);
280 if (tag_at(index).is_string()) {
281 oop archived_string = HeapShared::find_archived_heap_object(obj);
282 // Update the reference to point to the archived copy
283 // of this string.
284 // If the string is too large to archive, NULL is
285 // stored into rr. At run time, string_at_impl() will create and intern
286 // the string.
287 rr->obj_at_put(i, archived_string);
288 }
289 }
290 }
291
292 oop archived = HeapShared::archive_object(rr);
293 // If the resolved references array is not archived (too large),
294 // the 'archived' object is NULL. No need to explicitly check
295 // the return value of archive_object() here. At runtime, the
296 // resolved references will be created using the normal process
297 // when there is no archived value.
298 _cache->set_archived_references(archived);
299 }
300 }
301
302 void ConstantPool::resolve_class_constants(TRAPS) {
303 assert(DumpSharedSpaces, "used during dump time only");
304 // The _cache may be NULL if the _pool_holder klass fails verification
305 // at dump time due to missing dependencies.
306 if (cache() == NULL || reference_map() == NULL) {
307 return; // nothing to do
308 }
309
310 constantPoolHandle cp(THREAD, this);
311 for (int index = 1; index < length(); index++) { // Index 0 is unused
312 if (tag_at(index).is_string()) {
313 int cache_index = cp->cp_to_object_index(index);
314 string_at_impl(cp, index, cache_index, CHECK);
315 }
316 }
317 }
318
319 void ConstantPool::add_dumped_interned_strings() {
320 objArrayOop rr = resolved_references();
321 if (rr != NULL) {
322 int rr_len = rr->length();
323 for (int i = 0; i < rr_len; i++) {
324 oop p = rr->obj_at(i);
325 if (java_lang_String::is_instance(p)) {
326 HeapShared::add_to_dumped_interned_strings(p);
327 }
328 }
329 }
330 }
331 #endif
332
333 // CDS support. Create a new resolved_references array.
334 void ConstantPool::restore_unshareable_info(TRAPS) {
335 if (!_pool_holder->is_linked() && !_pool_holder->is_rewritten()) {
336 return;
337 }
338 assert(is_constantPool(), "ensure C++ vtable is restored");
339 assert(on_stack(), "should always be set for shared constant pools");
340 assert(is_shared(), "should always be set for shared constant pools");
341 assert(_cache != NULL, "constant pool _cache should not be NULL");
342
343 // Only create the new resolved references array if it hasn't been attempted before
344 if (resolved_references() != NULL) return;
345
346 // restore the C++ vtable from the shared archive
347 restore_vtable();
348
349 if (vmClasses::Object_klass_loaded()) {
350 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
351 #if INCLUDE_CDS_JAVA_HEAP
352 if (HeapShared::is_fully_available() &&
353 _cache->archived_references() != NULL) {
354 oop archived = _cache->archived_references();
355 // Create handle for the archived resolved reference array object
356 Handle refs_handle(THREAD, archived);
357 set_resolved_references(loader_data->add_handle(refs_handle));
358 _cache->clear_archived_references();
359 } else
360 #endif
361 {
362 // No mapped archived resolved reference array
363 // Recreate the object array and add to ClassLoaderData.
364 int map_length = resolved_reference_length();
365 if (map_length > 0) {
366 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK);
367 Handle refs_handle(THREAD, stom); // must handleize.
368 set_resolved_references(loader_data->add_handle(refs_handle));
369 }
370 }
371 }
372 }
373
374 void ConstantPool::remove_unshareable_info() {
375 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
376 // The _on_stack flag is used to prevent ConstantPools from deallocation during
377 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
378 // we always set _on_stack to true to avoid having to change _flags during runtime.
379 _flags |= (_on_stack | _is_shared);
380
381 if (!_pool_holder->is_linked() && !_pool_holder->verified_at_dump_time()) {
382 return;
383 }
384 // Resolved references are not in the shared archive.
385 // Save the length for restoration. It is not necessarily the same length
386 // as reference_map.length() if invokedynamic is saved. It is needed when
387 // re-creating the resolved reference array if archived heap data cannot be map
388 // at runtime.
389 set_resolved_reference_length(
390 resolved_references() != NULL ? resolved_references()->length() : 0);
391 set_resolved_references(OopHandle());
392
393 int num_klasses = 0;
394 for (int index = 1; index < length(); index++) { // Index 0 is unused
395 jbyte qdesc_bit = tag_at(index).is_Qdescriptor_klass() ? (jbyte) JVM_CONSTANT_QDescBit : 0;
396 if (tag_at(index).is_unresolved_klass_in_error()) {
397 tag_at_put(index, JVM_CONSTANT_UnresolvedClass | qdesc_bit);
398 } else if (tag_at(index).is_method_handle_in_error()) {
399 tag_at_put(index, JVM_CONSTANT_MethodHandle);
400 } else if (tag_at(index).is_method_type_in_error()) {
401 tag_at_put(index, JVM_CONSTANT_MethodType);
402 } else if (tag_at(index).is_dynamic_constant_in_error()) {
403 tag_at_put(index, JVM_CONSTANT_Dynamic);
404 }
405 if (tag_at(index).is_klass()) {
406 // This class was resolved as a side effect of executing Java code
407 // during dump time. We need to restore it back to an UnresolvedClass,
408 // so that the proper class loading and initialization can happen
409 // at runtime.
410 bool clear_it = true;
411 if (pool_holder()->is_hidden() && index == pool_holder()->this_class_index()) {
412 // All references to a hidden class's own field/methods are through this
413 // index. We cannot clear it. See comments in ClassFileParser::fill_instance_klass.
414 clear_it = false;
415 }
416 if (clear_it) {
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 | qdesc_bit);
423 assert(klass_name_at(index) == symbol_at(name_index), "sanity");
424 }
425 }
426 }
427 if (cache() != NULL) {
428 cache()->remove_unshareable_info();
429 }
430 }
431
432 int ConstantPool::cp_to_object_index(int cp_index) {
433 // this is harder don't do this so much.
434 int i = reference_map()->find(cp_index);
435 // We might not find the index for jsr292 call.
436 return (i < 0) ? _no_index_sentinel : i;
437 }
438
439 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
440 resolved_references()->obj_at_put(obj_index, str);
441 }
442
443 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
444 ResourceMark rm;
445 int line_number = -1;
446 const char * source_file = NULL;
447 if (JavaThread::current()->has_last_Java_frame()) {
448 // try to identify the method which called this function.
449 vframeStream vfst(JavaThread::current());
450 if (!vfst.at_end()) {
451 line_number = vfst.method()->line_number_from_bci(vfst.bci());
452 Symbol* s = vfst.method()->method_holder()->source_file_name();
453 if (s != NULL) {
454 source_file = s->as_C_string();
455 }
456 }
457 }
458 if (k != this_cp->pool_holder()) {
459 // only print something if the classes are different
460 if (source_file != NULL) {
461 log_debug(class, resolve)("%s %s %s:%d",
462 this_cp->pool_holder()->external_name(),
463 k->external_name(), source_file, line_number);
464 } else {
465 log_debug(class, resolve)("%s %s",
466 this_cp->pool_holder()->external_name(),
467 k->external_name());
468 }
469 }
470 }
471
472 void check_is_inline_type(Klass* k, TRAPS) {
473 if (!k->is_inline_klass()) {
474 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
475 }
476 }
477
478 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
479 TRAPS) {
480 JavaThread* javaThread = THREAD;
481
482 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
483 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
484 // the entry and tag is not updated atomicly.
485 CPKlassSlot kslot = this_cp->klass_slot_at(which);
486 int resolved_klass_index = kslot.resolved_klass_index();
487 int name_index = kslot.name_index();
488 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
489
490 // The tag must be JVM_CONSTANT_Class in order to read the correct value from
491 // the unresolved_klasses() array.
492 if (this_cp->tag_at(which).is_klass()) {
493 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
494 if (klass != NULL) {
495 return klass;
496 }
497 }
498
499 // This tag doesn't change back to unresolved class unless at a safepoint.
500 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
501 // The original attempt to resolve this constant pool entry failed so find the
502 // class of the original error and throw another error of the same class
503 // (JVMS 5.4.3).
504 // If there is a detail message, pass that detail message to the error.
505 // The JVMS does not strictly require us to duplicate the same detail message,
506 // or any internal exception fields such as cause or stacktrace. But since the
507 // detail message is often a class name or other literal string, we will repeat it
508 // if we can find it in the symbol table.
509 throw_resolution_error(this_cp, which, CHECK_NULL);
510 ShouldNotReachHere();
511 }
512
513 Handle mirror_handle;
514 Symbol* name = this_cp->symbol_at(name_index);
515 bool inline_type_signature = false;
516 if (name->is_Q_signature()) {
517 name = name->fundamental_name(THREAD);
518 inline_type_signature = true;
519 }
520 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
521 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
522
523 Klass* k;
524 {
525 // Turn off the single stepping while doing class resolution
526 JvmtiHideSingleStepping jhss(javaThread);
527 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
528 } // JvmtiHideSingleStepping jhss(javaThread);
529 if (inline_type_signature) {
530 name->decrement_refcount();
531 }
532
533 if (!HAS_PENDING_EXCEPTION) {
534 // preserve the resolved klass from unloading
535 mirror_handle = Handle(THREAD, k->java_mirror());
536 // Do access check for klasses
537 verify_constant_pool_resolve(this_cp, k, THREAD);
538 }
539
540 if (!HAS_PENDING_EXCEPTION && inline_type_signature) {
541 check_is_inline_type(k, THREAD);
542 }
543
544 if (!HAS_PENDING_EXCEPTION) {
545 Klass* bottom_klass = NULL;
546 if (k->is_objArray_klass()) {
547 bottom_klass = ObjArrayKlass::cast(k)->bottom_klass();
548 assert(bottom_klass != NULL, "Should be set");
549 assert(bottom_klass->is_instance_klass() || bottom_klass->is_typeArray_klass(), "Sanity check");
550 } else if (k->is_flatArray_klass()) {
551 bottom_klass = FlatArrayKlass::cast(k)->element_klass();
552 assert(bottom_klass != NULL, "Should be set");
553 }
554 }
555
556 // Failed to resolve class. We must record the errors so that subsequent attempts
557 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
558 if (HAS_PENDING_EXCEPTION) {
559 jbyte tag = JVM_CONSTANT_UnresolvedClass;
560 if (this_cp->tag_at(which).is_Qdescriptor_klass()) {
561 tag |= JVM_CONSTANT_QDescBit;
562 }
563 save_and_throw_exception(this_cp, which, constantTag(tag), CHECK_NULL);
564 // If CHECK_NULL above doesn't return the exception, that means that
565 // some other thread has beaten us and has resolved the class.
566 // To preserve old behavior, we return the resolved class.
567 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
568 assert(klass != NULL, "must be resolved if exception was cleared");
569 return klass;
570 }
571
572 // logging for class+resolve.
573 if (log_is_enabled(Debug, class, resolve)){
574 trace_class_resolution(this_cp, k);
575 }
576
577 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
578 Atomic::release_store(adr, k);
579 // The interpreter assumes when the tag is stored, the klass is resolved
580 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
581 // hardware store ordering here.
582 jbyte tag = JVM_CONSTANT_Class;
583 if (this_cp->tag_at(which).is_Qdescriptor_klass()) {
584 tag |= JVM_CONSTANT_QDescBit;
585 }
586 // We also need to CAS to not overwrite an error from a racing thread.
587
588 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
589 (jbyte)JVM_CONSTANT_UnresolvedClass,
590 tag);
591
592 // We need to recheck exceptions from racing thread and return the same.
593 if (old_tag == JVM_CONSTANT_UnresolvedClassInError) {
594 // Remove klass.
595 this_cp->resolved_klasses()->at_put(resolved_klass_index, NULL);
596 throw_resolution_error(this_cp, which, CHECK_NULL);
597 }
598
599 return k;
600 }
601
602
603 // Does not update ConstantPool* - to avoid any exception throwing. Used
604 // by compiler and exception handling. Also used to avoid classloads for
605 // instanceof operations. Returns NULL if the class has not been loaded or
606 // if the verification of constant pool failed
607 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
608 CPKlassSlot kslot = this_cp->klass_slot_at(which);
609 int resolved_klass_index = kslot.resolved_klass_index();
610 int name_index = kslot.name_index();
611 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
612
613 if (this_cp->tag_at(which).is_klass()) {
614 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
615 assert(k != NULL, "should be resolved");
616 return k;
617 } else if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
618 return NULL;
619 } else {
620 Thread* current = Thread::current();
621 Symbol* name = this_cp->symbol_at(name_index);
622 oop loader = this_cp->pool_holder()->class_loader();
623 oop protection_domain = this_cp->pool_holder()->protection_domain();
624 Handle h_prot (current, protection_domain);
625 Handle h_loader (current, loader);
626 Klass* k = SystemDictionary::find_instance_klass(name, h_loader, h_prot);
627
628 // Avoid constant pool verification at a safepoint, as it takes the Module_lock.
629 if (k != NULL && current->is_Java_thread()) {
630 // Make sure that resolving is legal
631 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
632 ExceptionMark em(THREAD);
633 // return NULL if verification fails
634 verify_constant_pool_resolve(this_cp, k, THREAD);
635 if (HAS_PENDING_EXCEPTION) {
636 CLEAR_PENDING_EXCEPTION;
637 return NULL;
638 }
639 return k;
640 } else {
641 return k;
642 }
643 }
644 }
645
646 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
647 int which) {
648 if (cpool->cache() == NULL) return NULL; // nothing to load yet
649 int cache_index = decode_cpcache_index(which, true);
650 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
651 // FIXME: should be an assert
652 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
653 return NULL;
654 }
655 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
656 return e->method_if_resolved(cpool);
657 }
658
659
660 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
661 if (cpool->cache() == NULL) return false; // nothing to load yet
662 int cache_index = decode_cpcache_index(which, true);
663 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
664 return e->has_appendix();
665 }
666
667 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
668 if (cpool->cache() == NULL) return NULL; // nothing to load yet
669 int cache_index = decode_cpcache_index(which, true);
670 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
671 return e->appendix_if_resolved(cpool);
672 }
673
674
675 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) {
676 if (cpool->cache() == NULL) return false; // nothing to load yet
677 int cache_index = decode_cpcache_index(which, true);
678 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
679 return e->has_local_signature();
680 }
681
682 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
683 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
684 return symbol_at(name_index);
685 }
686
687
688 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
689 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
690 return symbol_at(signature_index);
691 }
692
693 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
694 int i = which;
695 if (!uncached && cache() != NULL) {
696 if (ConstantPool::is_invokedynamic_index(which)) {
697 // Invokedynamic index is index into the constant pool cache
698 int pool_index = invokedynamic_bootstrap_ref_index_at(which);
699 pool_index = bootstrap_name_and_type_ref_index_at(pool_index);
700 assert(tag_at(pool_index).is_name_and_type(), "");
701 return pool_index;
702 }
703 // change byte-ordering and go via cache
704 i = remap_instruction_operand_from_cache(which);
705 } else {
706 if (tag_at(which).has_bootstrap()) {
707 int pool_index = bootstrap_name_and_type_ref_index_at(which);
708 assert(tag_at(pool_index).is_name_and_type(), "");
709 return pool_index;
710 }
711 }
712 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
713 assert(!tag_at(i).has_bootstrap(), "Must be handled above");
714 jint ref_index = *int_at_addr(i);
715 return extract_high_short_from_int(ref_index);
716 }
717
718 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
719 int pool_index = which;
720 if (!uncached && cache() != NULL) {
721 if (ConstantPool::is_invokedynamic_index(which)) {
722 // Invokedynamic index is index into resolved_references
723 pool_index = invokedynamic_bootstrap_ref_index_at(which);
724 } else {
725 // change byte-ordering and go via cache
726 pool_index = remap_instruction_operand_from_cache(which);
727 }
728 }
729 return tag_at(pool_index);
730 }
731
732 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
733 guarantee(!ConstantPool::is_invokedynamic_index(which),
734 "an invokedynamic instruction does not have a klass");
735 int i = which;
736 if (!uncached && cache() != NULL) {
737 // change byte-ordering and go via cache
738 i = remap_instruction_operand_from_cache(which);
739 }
740 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
741 jint ref_index = *int_at_addr(i);
742 return extract_low_short_from_int(ref_index);
743 }
744
745
746
747 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
748 int cpc_index = operand;
749 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
750 assert((int)(u2)cpc_index == cpc_index, "clean u2");
751 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
752 return member_index;
753 }
754
755
756 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
757 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
758 return; // short cut, typeArray klass is always accessible
759 }
760 Klass* holder = this_cp->pool_holder();
761 LinkResolver::check_klass_accessibility(holder, k, CHECK);
762 }
763
764
765 int ConstantPool::name_ref_index_at(int which_nt) {
766 jint ref_index = name_and_type_at(which_nt);
767 return extract_low_short_from_int(ref_index);
768 }
769
770
771 int ConstantPool::signature_ref_index_at(int which_nt) {
772 jint ref_index = name_and_type_at(which_nt);
773 return extract_high_short_from_int(ref_index);
774 }
775
776
777 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
778 return klass_at(klass_ref_index_at(which), THREAD);
779 }
780
781 Symbol* ConstantPool::klass_name_at(int which) const {
782 return symbol_at(klass_slot_at(which).name_index());
783 }
784
785 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
786 jint ref_index = klass_ref_index_at(which);
787 return klass_at_noresolve(ref_index);
788 }
789
790 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
791 jint ref_index = uncached_klass_ref_index_at(which);
792 return klass_at_noresolve(ref_index);
793 }
794
795 char* ConstantPool::string_at_noresolve(int which) {
796 return unresolved_string_at(which)->as_C_string();
797 }
798
799 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
800 return Signature::basic_type(symbol_at(which));
801 }
802
803
804 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
805 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
806 if (this_cp->tag_at(index).is_string()) {
807 this_cp->string_at(index, CHECK);
808 }
809 }
810 }
811
812 static Symbol* exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
813 // Dig out the detailed message to reuse if possible
814 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
815 if (message != NULL) {
816 return message;
817 }
818
819 // Return specific message for the tag
820 switch (tag.value()) {
821 case JVM_CONSTANT_UnresolvedClass:
822 // return the class name in the error message
823 message = this_cp->klass_name_at(which);
824 break;
825 case JVM_CONSTANT_MethodHandle:
826 // return the method handle name in the error message
827 message = this_cp->method_handle_name_ref_at(which);
828 break;
829 case JVM_CONSTANT_MethodType:
830 // return the method type signature in the error message
831 message = this_cp->method_type_signature_at(which);
832 break;
833 case JVM_CONSTANT_Dynamic:
834 // return the name of the condy in the error message
835 message = this_cp->uncached_name_ref_at(which);
836 break;
837 default:
838 ShouldNotReachHere();
839 }
840
841 return message;
842 }
843
844 static void add_resolution_error(const constantPoolHandle& this_cp, int which,
845 constantTag tag, oop pending_exception) {
846
847 Symbol* error = pending_exception->klass()->name();
848 oop cause = java_lang_Throwable::cause(pending_exception);
849
850 // Also dig out the exception cause, if present.
851 Symbol* cause_sym = NULL;
852 Symbol* cause_msg = NULL;
853 if (cause != NULL && cause != pending_exception) {
854 cause_sym = cause->klass()->name();
855 cause_msg = java_lang_Throwable::detail_message(cause);
856 }
857
858 Symbol* message = exception_message(this_cp, which, tag, pending_exception);
859 SystemDictionary::add_resolution_error(this_cp, which, error, message, cause_sym, cause_msg);
860 }
861
862
863 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
864 ResourceMark rm(THREAD);
865 Symbol* message = NULL;
866 Symbol* cause = NULL;
867 Symbol* cause_msg = NULL;
868 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message, &cause, &cause_msg);
869 assert(error != NULL, "checking");
870 const char* cause_str = cause_msg != NULL ? cause_msg->as_C_string() : NULL;
871
872 CLEAR_PENDING_EXCEPTION;
873 if (message != NULL) {
874 char* msg = message->as_C_string();
875 if (cause != NULL) {
876 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_str);
877 THROW_MSG_CAUSE(error, msg, h_cause);
878 } else {
879 THROW_MSG(error, msg);
880 }
881 } else {
882 if (cause != NULL) {
883 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_str);
884 THROW_CAUSE(error, h_cause);
885 } else {
886 THROW(error);
887 }
888 }
889 }
890
891 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
892 // exception in the resolution error table, so that the same exception is thrown again.
893 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
894 constantTag tag, TRAPS) {
895
896 int error_tag = tag.error_value();
897
898 if (!PENDING_EXCEPTION->
899 is_a(vmClasses::LinkageError_klass())) {
900 // Just throw the exception and don't prevent these classes from
901 // being loaded due to virtual machine errors like StackOverflow
902 // and OutOfMemoryError, etc, or if the thread was hit by stop()
903 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
904 } else if (this_cp->tag_at(which).value() != error_tag) {
905 add_resolution_error(this_cp, which, tag, PENDING_EXCEPTION);
906 // CAS in the tag. If a thread beat us to registering this error that's fine.
907 // If another thread resolved the reference, this is a race condition. This
908 // thread may have had a security manager or something temporary.
909 // This doesn't deterministically get an error. So why do we save this?
910 // We save this because jvmti can add classes to the bootclass path after
911 // this error, so it needs to get the same error if the error is first.
912 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
913 (jbyte)tag.value(),
914 (jbyte)error_tag);
915 if (old_tag != error_tag && old_tag != tag.value()) {
916 // MethodHandles and MethodType doesn't change to resolved version.
917 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
918 // Forget the exception and use the resolved class.
919 CLEAR_PENDING_EXCEPTION;
920 }
921 } else {
922 // some other thread put this in error state
923 throw_resolution_error(this_cp, which, CHECK);
924 }
925 }
926
927 constantTag ConstantPool::constant_tag_at(int which) {
928 constantTag tag = tag_at(which);
929 if (tag.is_dynamic_constant()) {
930 BasicType bt = basic_type_for_constant_at(which);
931 return constantTag(constantTag::type2tag(bt));
932 }
933 return tag;
934 }
935
936 BasicType ConstantPool::basic_type_for_constant_at(int which) {
937 constantTag tag = tag_at(which);
938 if (tag.is_dynamic_constant() ||
939 tag.is_dynamic_constant_in_error()) {
940 // have to look at the signature for this one
941 Symbol* constant_type = uncached_signature_ref_at(which);
942 return Signature::basic_type(constant_type);
943 }
944 return tag.basic_type();
945 }
946
947 // Called to resolve constants in the constant pool and return an oop.
948 // Some constant pool entries cache their resolved oop. This is also
949 // called to create oops from constants to use in arguments for invokedynamic
950 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
951 int index, int cache_index,
952 bool* status_return, TRAPS) {
953 oop result_oop = NULL;
954 Handle throw_exception;
955
956 if (cache_index == _possible_index_sentinel) {
957 // It is possible that this constant is one which is cached in the objects.
958 // We'll do a linear search. This should be OK because this usage is rare.
959 // FIXME: If bootstrap specifiers stress this code, consider putting in
960 // a reverse index. Binary search over a short array should do it.
961 assert(index > 0, "valid index");
962 cache_index = this_cp->cp_to_object_index(index);
963 }
964 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
965 assert(index == _no_index_sentinel || index >= 0, "");
966
967 if (cache_index >= 0) {
968 result_oop = this_cp->resolved_references()->obj_at(cache_index);
969 if (result_oop != NULL) {
970 if (result_oop == Universe::the_null_sentinel()) {
971 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index)));
972 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
973 result_oop = NULL;
974 }
975 if (status_return != NULL) (*status_return) = true;
976 return result_oop;
977 // That was easy...
978 }
979 index = this_cp->object_to_cp_index(cache_index);
980 }
981
982 jvalue prim_value; // temp used only in a few cases below
983
984 constantTag tag = this_cp->tag_at(index);
985
986 if (status_return != NULL) {
987 // don't trigger resolution if the constant might need it
988 switch (tag.value()) {
989 case JVM_CONSTANT_Class:
990 {
991 CPKlassSlot kslot = this_cp->klass_slot_at(index);
992 int resolved_klass_index = kslot.resolved_klass_index();
993 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) {
994 (*status_return) = false;
995 return NULL;
996 }
997 // the klass is waiting in the CP; go get it
998 break;
999 }
1000 case JVM_CONSTANT_String:
1001 case JVM_CONSTANT_Integer:
1002 case JVM_CONSTANT_Float:
1003 case JVM_CONSTANT_Long:
1004 case JVM_CONSTANT_Double:
1005 // these guys trigger OOM at worst
1006 break;
1007 default:
1008 (*status_return) = false;
1009 return NULL;
1010 }
1011 // from now on there is either success or an OOME
1012 (*status_return) = true;
1013 }
1014
1015 switch (tag.value()) {
1016
1017 case JVM_CONSTANT_UnresolvedClass:
1018 case JVM_CONSTANT_Class:
1019 {
1020 assert(cache_index == _no_index_sentinel, "should not have been set");
1021 Klass* resolved = klass_at_impl(this_cp, index, CHECK_NULL);
1022 // ldc wants the java mirror.
1023 result_oop = tag.is_Qdescriptor_klass()
1024 ? InlineKlass::cast(resolved)->val_mirror()
1025 : resolved->java_mirror();
1026 break;
1027 }
1028
1029 case JVM_CONSTANT_Dynamic:
1030 {
1031 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
1032 BootstrapInfo bootstrap_specifier(this_cp, index);
1033
1034 // The initial step in resolving an unresolved symbolic reference to a
1035 // dynamically-computed constant is to resolve the symbolic reference to a
1036 // method handle which will be the bootstrap method for the dynamically-computed
1037 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
1038 // method fails, then a MethodHandleInError is stored at the corresponding
1039 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
1040 // set a DynamicConstantInError here since any subsequent use of this
1041 // bootstrap method will encounter the resolution of MethodHandleInError.
1042 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
1043 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
1044 // for the bootstrap_specifier created above.
1045 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
1046 Exceptions::wrap_dynamic_exception(/* is_indy */ false, THREAD);
1047 if (HAS_PENDING_EXCEPTION) {
1048 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
1049 // will check for a LinkageError and store a DynamicConstantInError.
1050 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1051 }
1052 result_oop = bootstrap_specifier.resolved_value()();
1053 BasicType type = Signature::basic_type(bootstrap_specifier.signature());
1054 if (!is_reference_type(type)) {
1055 // Make sure the primitive value is properly boxed.
1056 // This is a JDK responsibility.
1057 const char* fail = NULL;
1058 if (result_oop == NULL) {
1059 fail = "null result instead of box";
1060 } else if (!is_java_primitive(type)) {
1061 // FIXME: support value types via unboxing
1062 fail = "can only handle references and primitives";
1063 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
1064 fail = "primitive is not properly boxed";
1065 }
1066 if (fail != NULL) {
1067 // Since this exception is not a LinkageError, throw exception
1068 // but do not save a DynamicInError resolution result.
1069 // See section 5.4.3 of the VM spec.
1070 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
1071 }
1072 }
1073
1074 LogTarget(Debug, methodhandles, condy) lt_condy;
1075 if (lt_condy.is_enabled()) {
1076 LogStream ls(lt_condy);
1077 bootstrap_specifier.print_msg_on(&ls, "resolve_constant_at_impl");
1078 }
1079 break;
1080 }
1081
1082 case JVM_CONSTANT_String:
1083 assert(cache_index != _no_index_sentinel, "should have been set");
1084 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
1085 break;
1086
1087 case JVM_CONSTANT_MethodHandle:
1088 {
1089 int ref_kind = this_cp->method_handle_ref_kind_at(index);
1090 int callee_index = this_cp->method_handle_klass_index_at(index);
1091 Symbol* name = this_cp->method_handle_name_ref_at(index);
1092 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
1093 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
1094 { ResourceMark rm(THREAD);
1095 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1096 ref_kind, index, this_cp->method_handle_index_at(index),
1097 callee_index, name->as_C_string(), signature->as_C_string());
1098 }
1099
1100 Klass* callee = klass_at_impl(this_cp, callee_index, THREAD);
1101 if (HAS_PENDING_EXCEPTION) {
1102 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1103 }
1104
1105 // Check constant pool method consistency
1106 if ((callee->is_interface() && m_tag.is_method()) ||
1107 (!callee->is_interface() && m_tag.is_interface_method())) {
1108 ResourceMark rm(THREAD);
1109 stringStream ss;
1110 ss.print("Inconsistent constant pool data in classfile for class %s. "
1111 "Method '", callee->name()->as_C_string());
1112 signature->print_as_signature_external_return_type(&ss);
1113 ss.print(" %s(", name->as_C_string());
1114 signature->print_as_signature_external_parameters(&ss);
1115 ss.print(")' at index %d is %s and should be %s",
1116 index,
1117 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1118 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1119 Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), "%s", ss.as_string());
1120 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1121 }
1122
1123 Klass* klass = this_cp->pool_holder();
1124 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1125 callee, name, signature,
1126 THREAD);
1127 if (HAS_PENDING_EXCEPTION) {
1128 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1129 }
1130 result_oop = value();
1131 break;
1132 }
1133
1134 case JVM_CONSTANT_MethodType:
1135 {
1136 Symbol* signature = this_cp->method_type_signature_at(index);
1137 { ResourceMark rm(THREAD);
1138 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1139 index, this_cp->method_type_index_at(index),
1140 signature->as_C_string());
1141 }
1142 Klass* klass = this_cp->pool_holder();
1143 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1144 result_oop = value();
1145 if (HAS_PENDING_EXCEPTION) {
1146 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1147 }
1148 break;
1149 }
1150
1151 case JVM_CONSTANT_Integer:
1152 assert(cache_index == _no_index_sentinel, "should not have been set");
1153 prim_value.i = this_cp->int_at(index);
1154 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1155 break;
1156
1157 case JVM_CONSTANT_Float:
1158 assert(cache_index == _no_index_sentinel, "should not have been set");
1159 prim_value.f = this_cp->float_at(index);
1160 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1161 break;
1162
1163 case JVM_CONSTANT_Long:
1164 assert(cache_index == _no_index_sentinel, "should not have been set");
1165 prim_value.j = this_cp->long_at(index);
1166 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1167 break;
1168
1169 case JVM_CONSTANT_Double:
1170 assert(cache_index == _no_index_sentinel, "should not have been set");
1171 prim_value.d = this_cp->double_at(index);
1172 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1173 break;
1174
1175 case JVM_CONSTANT_UnresolvedClassInError:
1176 case JVM_CONSTANT_DynamicInError:
1177 case JVM_CONSTANT_MethodHandleInError:
1178 case JVM_CONSTANT_MethodTypeInError:
1179 throw_resolution_error(this_cp, index, CHECK_NULL);
1180 break;
1181
1182 default:
1183 fatal("unexpected constant tag at CP %p[%d/%d] = %d", this_cp(), index, cache_index, tag.value());
1184 break;
1185 }
1186
1187 if (cache_index >= 0) {
1188 // Benign race condition: resolved_references may already be filled in.
1189 // The important thing here is that all threads pick up the same result.
1190 // It doesn't matter which racing thread wins, as long as only one
1191 // result is used by all threads, and all future queries.
1192 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop);
1193 oop old_result = this_cp->resolved_references()
1194 ->atomic_compare_exchange_oop(cache_index, new_result, NULL);
1195 if (old_result == NULL) {
1196 return result_oop; // was installed
1197 } else {
1198 // Return the winning thread's result. This can be different than
1199 // the result here for MethodHandles.
1200 if (old_result == Universe::the_null_sentinel())
1201 old_result = NULL;
1202 return old_result;
1203 }
1204 } else {
1205 assert(result_oop != Universe::the_null_sentinel(), "");
1206 return result_oop;
1207 }
1208 }
1209
1210 oop ConstantPool::uncached_string_at(int which, TRAPS) {
1211 Symbol* sym = unresolved_string_at(which);
1212 oop str = StringTable::intern(sym, CHECK_(NULL));
1213 assert(java_lang_String::is_instance(str), "must be string");
1214 return str;
1215 }
1216
1217 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index,
1218 int start_arg, int end_arg,
1219 objArrayHandle info, int pos,
1220 bool must_resolve, Handle if_not_available,
1221 TRAPS) {
1222 int limit = pos + end_arg - start_arg;
1223 // checks: index in range [0..this_cp->length),
1224 // tag at index, start..end in range [0..this_cp->bootstrap_argument_count],
1225 // info array non-null, pos..limit in [0..info.length]
1226 if ((0 >= index || index >= this_cp->length()) ||
1227 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1228 this_cp->tag_at(index).is_dynamic_constant()) ||
1229 (0 > start_arg || start_arg > end_arg) ||
1230 (end_arg > this_cp->bootstrap_argument_count_at(index)) ||
1231 (0 > pos || pos > limit) ||
1232 (info.is_null() || limit > info->length())) {
1233 // An index or something else went wrong; throw an error.
1234 // Since this is an internal API, we don't expect this,
1235 // so we don't bother to craft a nice message.
1236 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1237 }
1238 // now we can loop safely
1239 int info_i = pos;
1240 for (int i = start_arg; i < end_arg; i++) {
1241 int arg_index = this_cp->bootstrap_argument_index_at(index, i);
1242 oop arg_oop;
1243 if (must_resolve) {
1244 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1245 } else {
1246 bool found_it = false;
1247 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1248 if (!found_it) arg_oop = if_not_available();
1249 }
1250 info->obj_at_put(info_i++, arg_oop);
1251 }
1252 }
1253
1254 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1255 // If the string has already been interned, this entry will be non-null
1256 oop str = this_cp->resolved_references()->obj_at(obj_index);
1257 assert(str != Universe::the_null_sentinel(), "");
1258 if (str != NULL) return str;
1259 Symbol* sym = this_cp->unresolved_string_at(which);
1260 str = StringTable::intern(sym, CHECK_(NULL));
1261 this_cp->string_at_put(which, obj_index, str);
1262 assert(java_lang_String::is_instance(str), "must be string");
1263 return str;
1264 }
1265
1266
1267 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1268 // Names are interned, so we can compare Symbol*s directly
1269 Symbol* cp_name = klass_name_at(which);
1270 return (cp_name == k->name());
1271 }
1272
1273
1274 // Iterate over symbols and decrement ones which are Symbol*s
1275 // This is done during GC.
1276 // Only decrement the UTF8 symbols. Strings point to
1277 // these symbols but didn't increment the reference count.
1278 void ConstantPool::unreference_symbols() {
1279 for (int index = 1; index < length(); index++) { // Index 0 is unused
1280 constantTag tag = tag_at(index);
1281 if (tag.is_symbol()) {
1282 symbol_at(index)->decrement_refcount();
1283 }
1284 }
1285 }
1286
1287
1288 // Compare this constant pool's entry at index1 to the constant pool
1289 // cp2's entry at index2.
1290 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1291 int index2) {
1292
1293 // The error tags are equivalent to non-error tags when comparing
1294 jbyte t1 = tag_at(index1).non_error_value();
1295 jbyte t2 = cp2->tag_at(index2).non_error_value();
1296
1297 if (t1 != t2) {
1298 // Not the same entry type so there is nothing else to check. Note
1299 // that this style of checking will consider resolved/unresolved
1300 // class pairs as different.
1301 // From the ConstantPool* API point of view, this is correct
1302 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1303 // plays out in the context of ConstantPool* merging.
1304 return false;
1305 }
1306
1307 switch (t1) {
1308 case JVM_CONSTANT_Class:
1309 {
1310 Klass* k1 = resolved_klass_at(index1);
1311 Klass* k2 = cp2->resolved_klass_at(index2);
1312 if (k1 == k2) {
1313 return true;
1314 }
1315 } break;
1316
1317 case JVM_CONSTANT_ClassIndex:
1318 {
1319 int recur1 = klass_index_at(index1);
1320 int recur2 = cp2->klass_index_at(index2);
1321 if (compare_entry_to(recur1, cp2, recur2)) {
1322 return true;
1323 }
1324 } break;
1325
1326 case JVM_CONSTANT_Double:
1327 {
1328 jdouble d1 = double_at(index1);
1329 jdouble d2 = cp2->double_at(index2);
1330 if (d1 == d2) {
1331 return true;
1332 }
1333 } break;
1334
1335 case JVM_CONSTANT_Fieldref:
1336 case JVM_CONSTANT_InterfaceMethodref:
1337 case JVM_CONSTANT_Methodref:
1338 {
1339 int recur1 = uncached_klass_ref_index_at(index1);
1340 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1341 bool match = compare_entry_to(recur1, cp2, recur2);
1342 if (match) {
1343 recur1 = uncached_name_and_type_ref_index_at(index1);
1344 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1345 if (compare_entry_to(recur1, cp2, recur2)) {
1346 return true;
1347 }
1348 }
1349 } break;
1350
1351 case JVM_CONSTANT_Float:
1352 {
1353 jfloat f1 = float_at(index1);
1354 jfloat f2 = cp2->float_at(index2);
1355 if (f1 == f2) {
1356 return true;
1357 }
1358 } break;
1359
1360 case JVM_CONSTANT_Integer:
1361 {
1362 jint i1 = int_at(index1);
1363 jint i2 = cp2->int_at(index2);
1364 if (i1 == i2) {
1365 return true;
1366 }
1367 } break;
1368
1369 case JVM_CONSTANT_Long:
1370 {
1371 jlong l1 = long_at(index1);
1372 jlong l2 = cp2->long_at(index2);
1373 if (l1 == l2) {
1374 return true;
1375 }
1376 } break;
1377
1378 case JVM_CONSTANT_NameAndType:
1379 {
1380 int recur1 = name_ref_index_at(index1);
1381 int recur2 = cp2->name_ref_index_at(index2);
1382 if (compare_entry_to(recur1, cp2, recur2)) {
1383 recur1 = signature_ref_index_at(index1);
1384 recur2 = cp2->signature_ref_index_at(index2);
1385 if (compare_entry_to(recur1, cp2, recur2)) {
1386 return true;
1387 }
1388 }
1389 } break;
1390
1391 case JVM_CONSTANT_StringIndex:
1392 {
1393 int recur1 = string_index_at(index1);
1394 int recur2 = cp2->string_index_at(index2);
1395 if (compare_entry_to(recur1, cp2, recur2)) {
1396 return true;
1397 }
1398 } break;
1399
1400 case JVM_CONSTANT_UnresolvedClass:
1401 {
1402 Symbol* k1 = klass_name_at(index1);
1403 Symbol* k2 = cp2->klass_name_at(index2);
1404 if (k1 == k2) {
1405 return true;
1406 }
1407 } break;
1408
1409 case JVM_CONSTANT_MethodType:
1410 {
1411 int k1 = method_type_index_at(index1);
1412 int k2 = cp2->method_type_index_at(index2);
1413 if (compare_entry_to(k1, cp2, k2)) {
1414 return true;
1415 }
1416 } break;
1417
1418 case JVM_CONSTANT_MethodHandle:
1419 {
1420 int k1 = method_handle_ref_kind_at(index1);
1421 int k2 = cp2->method_handle_ref_kind_at(index2);
1422 if (k1 == k2) {
1423 int i1 = method_handle_index_at(index1);
1424 int i2 = cp2->method_handle_index_at(index2);
1425 if (compare_entry_to(i1, cp2, i2)) {
1426 return true;
1427 }
1428 }
1429 } break;
1430
1431 case JVM_CONSTANT_Dynamic:
1432 {
1433 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1434 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1435 int i1 = bootstrap_methods_attribute_index(index1);
1436 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1437 bool match_entry = compare_entry_to(k1, cp2, k2);
1438 bool match_operand = compare_operand_to(i1, cp2, i2);
1439 return (match_entry && match_operand);
1440 } break;
1441
1442 case JVM_CONSTANT_InvokeDynamic:
1443 {
1444 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1445 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1446 int i1 = bootstrap_methods_attribute_index(index1);
1447 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1448 bool match_entry = compare_entry_to(k1, cp2, k2);
1449 bool match_operand = compare_operand_to(i1, cp2, i2);
1450 return (match_entry && match_operand);
1451 } break;
1452
1453 case JVM_CONSTANT_String:
1454 {
1455 Symbol* s1 = unresolved_string_at(index1);
1456 Symbol* s2 = cp2->unresolved_string_at(index2);
1457 if (s1 == s2) {
1458 return true;
1459 }
1460 } break;
1461
1462 case JVM_CONSTANT_Utf8:
1463 {
1464 Symbol* s1 = symbol_at(index1);
1465 Symbol* s2 = cp2->symbol_at(index2);
1466 if (s1 == s2) {
1467 return true;
1468 }
1469 } break;
1470
1471 // Invalid is used as the tag for the second constant pool entry
1472 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1473 // not be seen by itself.
1474 case JVM_CONSTANT_Invalid: // fall through
1475
1476 default:
1477 ShouldNotReachHere();
1478 break;
1479 }
1480
1481 return false;
1482 } // end compare_entry_to()
1483
1484
1485 // Resize the operands array with delta_len and delta_size.
1486 // Used in RedefineClasses for CP merge.
1487 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1488 int old_len = operand_array_length(operands());
1489 int new_len = old_len + delta_len;
1490 int min_len = (delta_len > 0) ? old_len : new_len;
1491
1492 int old_size = operands()->length();
1493 int new_size = old_size + delta_size;
1494 int min_size = (delta_size > 0) ? old_size : new_size;
1495
1496 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1497 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1498
1499 // Set index in the resized array for existing elements only
1500 for (int idx = 0; idx < min_len; idx++) {
1501 int offset = operand_offset_at(idx); // offset in original array
1502 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1503 }
1504 // Copy the bootstrap specifiers only
1505 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1506 new_ops->adr_at(2*new_len),
1507 (min_size - 2*min_len) * sizeof(u2));
1508 // Explicitly deallocate old operands array.
1509 // Note, it is not needed for 7u backport.
1510 if ( operands() != NULL) { // the safety check
1511 MetadataFactory::free_array<u2>(loader_data, operands());
1512 }
1513 set_operands(new_ops);
1514 } // end resize_operands()
1515
1516
1517 // Extend the operands array with the length and size of the ext_cp operands.
1518 // Used in RedefineClasses for CP merge.
1519 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1520 int delta_len = operand_array_length(ext_cp->operands());
1521 if (delta_len == 0) {
1522 return; // nothing to do
1523 }
1524 int delta_size = ext_cp->operands()->length();
1525
1526 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1527
1528 if (operand_array_length(operands()) == 0) {
1529 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1530 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1531 // The first element index defines the offset of second part
1532 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1533 set_operands(new_ops);
1534 } else {
1535 resize_operands(delta_len, delta_size, CHECK);
1536 }
1537
1538 } // end extend_operands()
1539
1540
1541 // Shrink the operands array to a smaller array with new_len length.
1542 // Used in RedefineClasses for CP merge.
1543 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1544 int old_len = operand_array_length(operands());
1545 if (new_len == old_len) {
1546 return; // nothing to do
1547 }
1548 assert(new_len < old_len, "shrunken operands array must be smaller");
1549
1550 int free_base = operand_next_offset_at(new_len - 1);
1551 int delta_len = new_len - old_len;
1552 int delta_size = 2*delta_len + free_base - operands()->length();
1553
1554 resize_operands(delta_len, delta_size, CHECK);
1555
1556 } // end shrink_operands()
1557
1558
1559 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1560 const constantPoolHandle& to_cp,
1561 TRAPS) {
1562
1563 int from_oplen = operand_array_length(from_cp->operands());
1564 int old_oplen = operand_array_length(to_cp->operands());
1565 if (from_oplen != 0) {
1566 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1567 // append my operands to the target's operands array
1568 if (old_oplen == 0) {
1569 // Can't just reuse from_cp's operand list because of deallocation issues
1570 int len = from_cp->operands()->length();
1571 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1572 Copy::conjoint_memory_atomic(
1573 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1574 to_cp->set_operands(new_ops);
1575 } else {
1576 int old_len = to_cp->operands()->length();
1577 int from_len = from_cp->operands()->length();
1578 int old_off = old_oplen * sizeof(u2);
1579 int from_off = from_oplen * sizeof(u2);
1580 // Use the metaspace for the destination constant pool
1581 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1582 int fillp = 0, len = 0;
1583 // first part of dest
1584 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1585 new_operands->adr_at(fillp),
1586 (len = old_off) * sizeof(u2));
1587 fillp += len;
1588 // first part of src
1589 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1590 new_operands->adr_at(fillp),
1591 (len = from_off) * sizeof(u2));
1592 fillp += len;
1593 // second part of dest
1594 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1595 new_operands->adr_at(fillp),
1596 (len = old_len - old_off) * sizeof(u2));
1597 fillp += len;
1598 // second part of src
1599 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1600 new_operands->adr_at(fillp),
1601 (len = from_len - from_off) * sizeof(u2));
1602 fillp += len;
1603 assert(fillp == new_operands->length(), "");
1604
1605 // Adjust indexes in the first part of the copied operands array.
1606 for (int j = 0; j < from_oplen; j++) {
1607 int offset = operand_offset_at(new_operands, old_oplen + j);
1608 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1609 offset += old_len; // every new tuple is preceded by old_len extra u2's
1610 operand_offset_at_put(new_operands, old_oplen + j, offset);
1611 }
1612
1613 // replace target operands array with combined array
1614 to_cp->set_operands(new_operands);
1615 }
1616 }
1617 } // end copy_operands()
1618
1619
1620 // Copy this constant pool's entries at start_i to end_i (inclusive)
1621 // to the constant pool to_cp's entries starting at to_i. A total of
1622 // (end_i - start_i) + 1 entries are copied.
1623 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1624 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1625
1626
1627 int dest_i = to_i; // leave original alone for debug purposes
1628
1629 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1630 copy_entry_to(from_cp, src_i, to_cp, dest_i);
1631
1632 switch (from_cp->tag_at(src_i).value()) {
1633 case JVM_CONSTANT_Double:
1634 case JVM_CONSTANT_Long:
1635 // double and long take two constant pool entries
1636 src_i += 2;
1637 dest_i += 2;
1638 break;
1639
1640 default:
1641 // all others take one constant pool entry
1642 src_i++;
1643 dest_i++;
1644 break;
1645 }
1646 }
1647 copy_operands(from_cp, to_cp, CHECK);
1648
1649 } // end copy_cp_to_impl()
1650
1651
1652 // Copy this constant pool's entry at from_i to the constant pool
1653 // to_cp's entry at to_i.
1654 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1655 const constantPoolHandle& to_cp, int to_i) {
1656
1657 int tag = from_cp->tag_at(from_i).value();
1658 switch (tag) {
1659 case JVM_CONSTANT_ClassIndex:
1660 {
1661 jint ki = from_cp->klass_index_at(from_i);
1662 to_cp->klass_index_at_put(to_i, ki);
1663 } break;
1664
1665 case JVM_CONSTANT_Double:
1666 {
1667 jdouble d = from_cp->double_at(from_i);
1668 to_cp->double_at_put(to_i, d);
1669 // double takes two constant pool entries so init second entry's tag
1670 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1671 } break;
1672
1673 case JVM_CONSTANT_Fieldref:
1674 {
1675 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1676 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1677 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1678 } break;
1679
1680 case JVM_CONSTANT_Float:
1681 {
1682 jfloat f = from_cp->float_at(from_i);
1683 to_cp->float_at_put(to_i, f);
1684 } break;
1685
1686 case JVM_CONSTANT_Integer:
1687 {
1688 jint i = from_cp->int_at(from_i);
1689 to_cp->int_at_put(to_i, i);
1690 } break;
1691
1692 case JVM_CONSTANT_InterfaceMethodref:
1693 {
1694 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1695 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1696 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1697 } break;
1698
1699 case JVM_CONSTANT_Long:
1700 {
1701 jlong l = from_cp->long_at(from_i);
1702 to_cp->long_at_put(to_i, l);
1703 // long takes two constant pool entries so init second entry's tag
1704 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1705 } break;
1706
1707 case JVM_CONSTANT_Methodref:
1708 {
1709 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1710 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1711 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1712 } break;
1713
1714 case JVM_CONSTANT_NameAndType:
1715 {
1716 int name_ref_index = from_cp->name_ref_index_at(from_i);
1717 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1718 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1719 } break;
1720
1721 case JVM_CONSTANT_StringIndex:
1722 {
1723 jint si = from_cp->string_index_at(from_i);
1724 to_cp->string_index_at_put(to_i, si);
1725 } break;
1726
1727 case JVM_CONSTANT_Class:
1728 case JVM_CONSTANT_UnresolvedClass:
1729 case JVM_CONSTANT_UnresolvedClassInError:
1730 {
1731 // Revert to JVM_CONSTANT_ClassIndex
1732 int name_index = from_cp->klass_slot_at(from_i).name_index();
1733 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1734 to_cp->klass_index_at_put(to_i, name_index);
1735 } break;
1736
1737 case JVM_CONSTANT_String:
1738 {
1739 Symbol* s = from_cp->unresolved_string_at(from_i);
1740 to_cp->unresolved_string_at_put(to_i, s);
1741 } break;
1742
1743 case JVM_CONSTANT_Utf8:
1744 {
1745 Symbol* s = from_cp->symbol_at(from_i);
1746 // Need to increase refcount, the old one will be thrown away and deferenced
1747 s->increment_refcount();
1748 to_cp->symbol_at_put(to_i, s);
1749 } break;
1750
1751 case JVM_CONSTANT_MethodType:
1752 case JVM_CONSTANT_MethodTypeInError:
1753 {
1754 jint k = from_cp->method_type_index_at(from_i);
1755 to_cp->method_type_index_at_put(to_i, k);
1756 } break;
1757
1758 case JVM_CONSTANT_MethodHandle:
1759 case JVM_CONSTANT_MethodHandleInError:
1760 {
1761 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1762 int k2 = from_cp->method_handle_index_at(from_i);
1763 to_cp->method_handle_index_at_put(to_i, k1, k2);
1764 } break;
1765
1766 case JVM_CONSTANT_Dynamic:
1767 case JVM_CONSTANT_DynamicInError:
1768 {
1769 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1770 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1771 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1772 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1773 } break;
1774
1775 case JVM_CONSTANT_InvokeDynamic:
1776 {
1777 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1778 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1779 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1780 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1781 } break;
1782
1783 // Invalid is used as the tag for the second constant pool entry
1784 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1785 // not be seen by itself.
1786 case JVM_CONSTANT_Invalid: // fall through
1787
1788 default:
1789 {
1790 ShouldNotReachHere();
1791 } break;
1792 }
1793 } // end copy_entry_to()
1794
1795 // Search constant pool search_cp for an entry that matches this
1796 // constant pool's entry at pattern_i. Returns the index of a
1797 // matching entry or zero (0) if there is no matching entry.
1798 int ConstantPool::find_matching_entry(int pattern_i,
1799 const constantPoolHandle& search_cp) {
1800
1801 // index zero (0) is not used
1802 for (int i = 1; i < search_cp->length(); i++) {
1803 bool found = compare_entry_to(pattern_i, search_cp, i);
1804 if (found) {
1805 return i;
1806 }
1807 }
1808
1809 return 0; // entry not found; return unused index zero (0)
1810 } // end find_matching_entry()
1811
1812
1813 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1814 // cp2's bootstrap specifier at idx2.
1815 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2) {
1816 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1817 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1818 bool match = compare_entry_to(k1, cp2, k2);
1819
1820 if (!match) {
1821 return false;
1822 }
1823 int argc = operand_argument_count_at(idx1);
1824 if (argc == cp2->operand_argument_count_at(idx2)) {
1825 for (int j = 0; j < argc; j++) {
1826 k1 = operand_argument_index_at(idx1, j);
1827 k2 = cp2->operand_argument_index_at(idx2, j);
1828 match = compare_entry_to(k1, cp2, k2);
1829 if (!match) {
1830 return false;
1831 }
1832 }
1833 return true; // got through loop; all elements equal
1834 }
1835 return false;
1836 } // end compare_operand_to()
1837
1838 // Search constant pool search_cp for a bootstrap specifier that matches
1839 // this constant pool's bootstrap specifier data at pattern_i index.
1840 // Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1841 int ConstantPool::find_matching_operand(int pattern_i,
1842 const constantPoolHandle& search_cp, int search_len) {
1843 for (int i = 0; i < search_len; i++) {
1844 bool found = compare_operand_to(pattern_i, search_cp, i);
1845 if (found) {
1846 return i;
1847 }
1848 }
1849 return -1; // bootstrap specifier data not found; return unused index (-1)
1850 } // end find_matching_operand()
1851
1852
1853 #ifndef PRODUCT
1854
1855 const char* ConstantPool::printable_name_at(int which) {
1856
1857 constantTag tag = tag_at(which);
1858
1859 if (tag.is_string()) {
1860 return string_at_noresolve(which);
1861 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1862 return klass_name_at(which)->as_C_string();
1863 } else if (tag.is_symbol()) {
1864 return symbol_at(which)->as_C_string();
1865 }
1866 return "";
1867 }
1868
1869 #endif // PRODUCT
1870
1871
1872 // JVMTI GetConstantPool support
1873
1874 // For debugging of constant pool
1875 const bool debug_cpool = false;
1876
1877 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1878
1879 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1880 const char* WARN_MSG = "Must not be such entry!";
1881 jint size = 0;
1882 u2 idx1, idx2;
1883
1884 for (jint idx = 1; idx < cnt; idx++) {
1885 jint ent_size = 0;
1886 u1 tag = *bytes++;
1887 size++; // count tag
1888
1889 printf("const #%03d, tag: %02d ", idx, tag);
1890 switch(tag) {
1891 case JVM_CONSTANT_Invalid: {
1892 printf("Invalid");
1893 break;
1894 }
1895 case JVM_CONSTANT_Unicode: {
1896 printf("Unicode %s", WARN_MSG);
1897 break;
1898 }
1899 case JVM_CONSTANT_Utf8: {
1900 u2 len = Bytes::get_Java_u2(bytes);
1901 char str[128];
1902 if (len > 127) {
1903 len = 127;
1904 }
1905 strncpy(str, (char *) (bytes+2), len);
1906 str[len] = '\0';
1907 printf("Utf8 \"%s\"", str);
1908 ent_size = 2 + len;
1909 break;
1910 }
1911 case JVM_CONSTANT_Integer: {
1912 u4 val = Bytes::get_Java_u4(bytes);
1913 printf("int %d", *(int *) &val);
1914 ent_size = 4;
1915 break;
1916 }
1917 case JVM_CONSTANT_Float: {
1918 u4 val = Bytes::get_Java_u4(bytes);
1919 printf("float %5.3ff", *(float *) &val);
1920 ent_size = 4;
1921 break;
1922 }
1923 case JVM_CONSTANT_Long: {
1924 u8 val = Bytes::get_Java_u8(bytes);
1925 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1926 ent_size = 8;
1927 idx++; // Long takes two cpool slots
1928 break;
1929 }
1930 case JVM_CONSTANT_Double: {
1931 u8 val = Bytes::get_Java_u8(bytes);
1932 printf("double %5.3fd", *(jdouble *)&val);
1933 ent_size = 8;
1934 idx++; // Double takes two cpool slots
1935 break;
1936 }
1937 case JVM_CONSTANT_Class: {
1938 idx1 = Bytes::get_Java_u2(bytes);
1939 printf("class #%03d", idx1);
1940 ent_size = 2;
1941 break;
1942 }
1943 case (JVM_CONSTANT_Class | JVM_CONSTANT_QDescBit): {
1944 idx1 = Bytes::get_Java_u2(bytes);
1945 printf("qclass #%03d", idx1);
1946 ent_size = 2;
1947 break;
1948 }
1949 case JVM_CONSTANT_String: {
1950 idx1 = Bytes::get_Java_u2(bytes);
1951 printf("String #%03d", idx1);
1952 ent_size = 2;
1953 break;
1954 }
1955 case JVM_CONSTANT_Fieldref: {
1956 idx1 = Bytes::get_Java_u2(bytes);
1957 idx2 = Bytes::get_Java_u2(bytes+2);
1958 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1959 ent_size = 4;
1960 break;
1961 }
1962 case JVM_CONSTANT_Methodref: {
1963 idx1 = Bytes::get_Java_u2(bytes);
1964 idx2 = Bytes::get_Java_u2(bytes+2);
1965 printf("Method #%03d, #%03d", idx1, idx2);
1966 ent_size = 4;
1967 break;
1968 }
1969 case JVM_CONSTANT_InterfaceMethodref: {
1970 idx1 = Bytes::get_Java_u2(bytes);
1971 idx2 = Bytes::get_Java_u2(bytes+2);
1972 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1973 ent_size = 4;
1974 break;
1975 }
1976 case JVM_CONSTANT_NameAndType: {
1977 idx1 = Bytes::get_Java_u2(bytes);
1978 idx2 = Bytes::get_Java_u2(bytes+2);
1979 printf("NameAndType #%03d, #%03d", idx1, idx2);
1980 ent_size = 4;
1981 break;
1982 }
1983 case JVM_CONSTANT_ClassIndex: {
1984 printf("ClassIndex %s", WARN_MSG);
1985 break;
1986 }
1987 case JVM_CONSTANT_UnresolvedClass: {
1988 printf("UnresolvedClass: %s", WARN_MSG);
1989 break;
1990 }
1991 case (JVM_CONSTANT_UnresolvedClass | JVM_CONSTANT_QDescBit): {
1992 printf("UnresolvedQClass: %s", WARN_MSG);
1993 break;
1994 }
1995 case JVM_CONSTANT_UnresolvedClassInError: {
1996 printf("UnresolvedClassInErr: %s", WARN_MSG);
1997 break;
1998 }
1999 case JVM_CONSTANT_StringIndex: {
2000 printf("StringIndex: %s", WARN_MSG);
2001 break;
2002 }
2003 }
2004 printf(";\n");
2005 bytes += ent_size;
2006 size += ent_size;
2007 }
2008 printf("Cpool size: %d\n", size);
2009 fflush(0);
2010 return;
2011 } /* end print_cpool_bytes */
2012
2013
2014 // Returns size of constant pool entry.
2015 jint ConstantPool::cpool_entry_size(jint idx) {
2016 switch(tag_at(idx).value()) {
2017 case JVM_CONSTANT_Invalid:
2018 case JVM_CONSTANT_Unicode:
2019 return 1;
2020
2021 case JVM_CONSTANT_Utf8:
2022 return 3 + symbol_at(idx)->utf8_length();
2023
2024 case JVM_CONSTANT_Class:
2025 case JVM_CONSTANT_String:
2026 case JVM_CONSTANT_ClassIndex:
2027 case JVM_CONSTANT_UnresolvedClass:
2028 case JVM_CONSTANT_UnresolvedClassInError:
2029 case JVM_CONSTANT_StringIndex:
2030 case JVM_CONSTANT_MethodType:
2031 case JVM_CONSTANT_MethodTypeInError:
2032 return 3;
2033
2034 case JVM_CONSTANT_MethodHandle:
2035 case JVM_CONSTANT_MethodHandleInError:
2036 return 4; //tag, ref_kind, ref_index
2037
2038 case JVM_CONSTANT_Integer:
2039 case JVM_CONSTANT_Float:
2040 case JVM_CONSTANT_Fieldref:
2041 case JVM_CONSTANT_Methodref:
2042 case JVM_CONSTANT_InterfaceMethodref:
2043 case JVM_CONSTANT_NameAndType:
2044 return 5;
2045
2046 case JVM_CONSTANT_Dynamic:
2047 case JVM_CONSTANT_DynamicInError:
2048 case JVM_CONSTANT_InvokeDynamic:
2049 // u1 tag, u2 bsm, u2 nt
2050 return 5;
2051
2052 case JVM_CONSTANT_Long:
2053 case JVM_CONSTANT_Double:
2054 return 9;
2055 }
2056 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
2057 return 1;
2058 } /* end cpool_entry_size */
2059
2060
2061 // SymbolHashMap is used to find a constant pool index from a string.
2062 // This function fills in SymbolHashMaps, one for utf8s and one for
2063 // class names, returns size of the cpool raw bytes.
2064 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
2065 SymbolHashMap *classmap) {
2066 jint size = 0;
2067
2068 for (u2 idx = 1; idx < length(); idx++) {
2069 u2 tag = tag_at(idx).value();
2070 size += cpool_entry_size(idx);
2071
2072 switch(tag) {
2073 case JVM_CONSTANT_Utf8: {
2074 Symbol* sym = symbol_at(idx);
2075 symmap->add_entry(sym, idx);
2076 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
2077 break;
2078 }
2079 case JVM_CONSTANT_Class:
2080 case JVM_CONSTANT_UnresolvedClass:
2081 case JVM_CONSTANT_UnresolvedClassInError: {
2082 Symbol* sym = klass_name_at(idx);
2083 classmap->add_entry(sym, idx);
2084 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
2085 break;
2086 }
2087 case JVM_CONSTANT_Long:
2088 case JVM_CONSTANT_Double: {
2089 idx++; // Both Long and Double take two cpool slots
2090 break;
2091 }
2092 }
2093 }
2094 return size;
2095 } /* end hash_utf8_entries_to */
2096
2097
2098 // Copy cpool bytes.
2099 // Returns:
2100 // 0, in case of OutOfMemoryError
2101 // -1, in case of internal error
2102 // > 0, count of the raw cpool bytes that have been copied
2103 int ConstantPool::copy_cpool_bytes(int cpool_size,
2104 SymbolHashMap* tbl,
2105 unsigned char *bytes) {
2106 u2 idx1, idx2;
2107 jint size = 0;
2108 jint cnt = length();
2109 unsigned char *start_bytes = bytes;
2110
2111 for (jint idx = 1; idx < cnt; idx++) {
2112 u1 tag = tag_at(idx).value();
2113 jint ent_size = cpool_entry_size(idx);
2114
2115 assert(size + ent_size <= cpool_size, "Size mismatch");
2116
2117 *bytes = tag;
2118 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2119 switch(tag) {
2120 case JVM_CONSTANT_Invalid: {
2121 DBG(printf("JVM_CONSTANT_Invalid"));
2122 break;
2123 }
2124 case JVM_CONSTANT_Unicode: {
2125 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2126 DBG(printf("JVM_CONSTANT_Unicode"));
2127 break;
2128 }
2129 case JVM_CONSTANT_Utf8: {
2130 Symbol* sym = symbol_at(idx);
2131 char* str = sym->as_utf8();
2132 // Warning! It's crashing on x86 with len = sym->utf8_length()
2133 int len = (int) strlen(str);
2134 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2135 for (int i = 0; i < len; i++) {
2136 bytes[3+i] = (u1) str[i];
2137 }
2138 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2139 break;
2140 }
2141 case JVM_CONSTANT_Integer: {
2142 jint val = int_at(idx);
2143 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2144 break;
2145 }
2146 case JVM_CONSTANT_Float: {
2147 jfloat val = float_at(idx);
2148 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2149 break;
2150 }
2151 case JVM_CONSTANT_Long: {
2152 jlong val = long_at(idx);
2153 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2154 idx++; // Long takes two cpool slots
2155 break;
2156 }
2157 case JVM_CONSTANT_Double: {
2158 jdouble val = double_at(idx);
2159 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2160 idx++; // Double takes two cpool slots
2161 break;
2162 }
2163 case JVM_CONSTANT_Class:
2164 case JVM_CONSTANT_UnresolvedClass:
2165 case JVM_CONSTANT_UnresolvedClassInError: {
2166 *bytes = JVM_CONSTANT_Class;
2167 Symbol* sym = klass_name_at(idx);
2168 idx1 = tbl->symbol_to_value(sym);
2169 assert(idx1 != 0, "Have not found a hashtable entry");
2170 Bytes::put_Java_u2((address) (bytes+1), idx1);
2171 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2172 break;
2173 }
2174 case JVM_CONSTANT_String: {
2175 *bytes = JVM_CONSTANT_String;
2176 Symbol* sym = unresolved_string_at(idx);
2177 idx1 = tbl->symbol_to_value(sym);
2178 assert(idx1 != 0, "Have not found a hashtable entry");
2179 Bytes::put_Java_u2((address) (bytes+1), idx1);
2180 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2181 break;
2182 }
2183 case JVM_CONSTANT_Fieldref:
2184 case JVM_CONSTANT_Methodref:
2185 case JVM_CONSTANT_InterfaceMethodref: {
2186 idx1 = uncached_klass_ref_index_at(idx);
2187 idx2 = uncached_name_and_type_ref_index_at(idx);
2188 Bytes::put_Java_u2((address) (bytes+1), idx1);
2189 Bytes::put_Java_u2((address) (bytes+3), idx2);
2190 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2191 break;
2192 }
2193 case JVM_CONSTANT_NameAndType: {
2194 idx1 = name_ref_index_at(idx);
2195 idx2 = signature_ref_index_at(idx);
2196 Bytes::put_Java_u2((address) (bytes+1), idx1);
2197 Bytes::put_Java_u2((address) (bytes+3), idx2);
2198 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2199 break;
2200 }
2201 case JVM_CONSTANT_ClassIndex: {
2202 *bytes = JVM_CONSTANT_Class;
2203 idx1 = klass_index_at(idx);
2204 Bytes::put_Java_u2((address) (bytes+1), idx1);
2205 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2206 break;
2207 }
2208 case JVM_CONSTANT_StringIndex: {
2209 *bytes = JVM_CONSTANT_String;
2210 idx1 = string_index_at(idx);
2211 Bytes::put_Java_u2((address) (bytes+1), idx1);
2212 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2213 break;
2214 }
2215 case JVM_CONSTANT_MethodHandle:
2216 case JVM_CONSTANT_MethodHandleInError: {
2217 *bytes = JVM_CONSTANT_MethodHandle;
2218 int kind = method_handle_ref_kind_at(idx);
2219 idx1 = method_handle_index_at(idx);
2220 *(bytes+1) = (unsigned char) kind;
2221 Bytes::put_Java_u2((address) (bytes+2), idx1);
2222 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2223 break;
2224 }
2225 case JVM_CONSTANT_MethodType:
2226 case JVM_CONSTANT_MethodTypeInError: {
2227 *bytes = JVM_CONSTANT_MethodType;
2228 idx1 = method_type_index_at(idx);
2229 Bytes::put_Java_u2((address) (bytes+1), idx1);
2230 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2231 break;
2232 }
2233 case JVM_CONSTANT_Dynamic:
2234 case JVM_CONSTANT_DynamicInError: {
2235 *bytes = tag;
2236 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2237 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2238 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2239 Bytes::put_Java_u2((address) (bytes+1), idx1);
2240 Bytes::put_Java_u2((address) (bytes+3), idx2);
2241 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2242 break;
2243 }
2244 case JVM_CONSTANT_InvokeDynamic: {
2245 *bytes = tag;
2246 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2247 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2248 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2249 Bytes::put_Java_u2((address) (bytes+1), idx1);
2250 Bytes::put_Java_u2((address) (bytes+3), idx2);
2251 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2252 break;
2253 }
2254 }
2255 DBG(printf("\n"));
2256 bytes += ent_size;
2257 size += ent_size;
2258 }
2259 assert(size == cpool_size, "Size mismatch");
2260
2261 // Keep temorarily for debugging until it's stable.
2262 DBG(print_cpool_bytes(cnt, start_bytes));
2263 return (int)(bytes - start_bytes);
2264 } /* end copy_cpool_bytes */
2265
2266 #undef DBG
2267
2268
2269 void ConstantPool::set_on_stack(const bool value) {
2270 if (value) {
2271 // Only record if it's not already set.
2272 if (!on_stack()) {
2273 assert(!is_shared(), "should always be set for shared constant pools");
2274 _flags |= _on_stack;
2275 MetadataOnStackMark::record(this);
2276 }
2277 } else {
2278 // Clearing is done single-threadedly.
2279 if (!is_shared()) {
2280 _flags &= ~_on_stack;
2281 }
2282 }
2283 }
2284
2285 // Printing
2286
2287 void ConstantPool::print_on(outputStream* st) const {
2288 assert(is_constantPool(), "must be constantPool");
2289 st->print_cr("%s", internal_name());
2290 if (flags() != 0) {
2291 st->print(" - flags: 0x%x", flags());
2292 if (has_preresolution()) st->print(" has_preresolution");
2293 if (on_stack()) st->print(" on_stack");
2294 st->cr();
2295 }
2296 if (pool_holder() != NULL) {
2297 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
2298 }
2299 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
2300 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
2301 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
2302 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
2303
2304 for (int index = 1; index < length(); index++) { // Index 0 is unused
2305 ((ConstantPool*)this)->print_entry_on(index, st);
2306 switch (tag_at(index).value()) {
2307 case JVM_CONSTANT_Long :
2308 case JVM_CONSTANT_Double :
2309 index++; // Skip entry following eigth-byte constant
2310 }
2311
2312 }
2313 st->cr();
2314 }
2315
2316 // Print one constant pool entry
2317 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2318 EXCEPTION_MARK;
2319 st->print(" - %3d : ", index);
2320 tag_at(index).print_on(st);
2321 st->print(" : ");
2322 switch (tag_at(index).value()) {
2323 case JVM_CONSTANT_Class :
2324 { Klass* k = klass_at(index, CATCH);
2325 guarantee(k != NULL, "need klass");
2326 k->print_value_on(st);
2327 st->print(" {" PTR_FORMAT "}", p2i(k));
2328 }
2329 break;
2330 case JVM_CONSTANT_Fieldref :
2331 case JVM_CONSTANT_Methodref :
2332 case JVM_CONSTANT_InterfaceMethodref :
2333 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2334 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2335 break;
2336 case JVM_CONSTANT_String :
2337 unresolved_string_at(index)->print_value_on(st);
2338 break;
2339 case JVM_CONSTANT_Integer :
2340 st->print("%d", int_at(index));
2341 break;
2342 case JVM_CONSTANT_Float :
2343 st->print("%f", float_at(index));
2344 break;
2345 case JVM_CONSTANT_Long :
2346 st->print_jlong(long_at(index));
2347 break;
2348 case JVM_CONSTANT_Double :
2349 st->print("%lf", double_at(index));
2350 break;
2351 case JVM_CONSTANT_NameAndType :
2352 st->print("name_index=%d", name_ref_index_at(index));
2353 st->print(" signature_index=%d", signature_ref_index_at(index));
2354 break;
2355 case JVM_CONSTANT_Utf8 :
2356 symbol_at(index)->print_value_on(st);
2357 break;
2358 case JVM_CONSTANT_ClassIndex: {
2359 int name_index = *int_at_addr(index);
2360 st->print("klass_index=%d ", name_index);
2361 symbol_at(name_index)->print_value_on(st);
2362 }
2363 break;
2364 case JVM_CONSTANT_UnresolvedClass : // fall-through
2365 case JVM_CONSTANT_UnresolvedClassInError: {
2366 CPKlassSlot kslot = klass_slot_at(index);
2367 int resolved_klass_index = kslot.resolved_klass_index();
2368 int name_index = kslot.name_index();
2369 assert(tag_at(name_index).is_symbol(), "sanity");
2370 symbol_at(name_index)->print_value_on(st);
2371 }
2372 break;
2373 case JVM_CONSTANT_MethodHandle :
2374 case JVM_CONSTANT_MethodHandleInError :
2375 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2376 st->print(" ref_index=%d", method_handle_index_at(index));
2377 break;
2378 case JVM_CONSTANT_MethodType :
2379 case JVM_CONSTANT_MethodTypeInError :
2380 st->print("signature_index=%d", method_type_index_at(index));
2381 break;
2382 case JVM_CONSTANT_Dynamic :
2383 case JVM_CONSTANT_DynamicInError :
2384 {
2385 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2386 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2387 int argc = bootstrap_argument_count_at(index);
2388 if (argc > 0) {
2389 for (int arg_i = 0; arg_i < argc; arg_i++) {
2390 int arg = bootstrap_argument_index_at(index, arg_i);
2391 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2392 }
2393 st->print("}");
2394 }
2395 }
2396 break;
2397 case JVM_CONSTANT_InvokeDynamic :
2398 {
2399 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2400 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2401 int argc = bootstrap_argument_count_at(index);
2402 if (argc > 0) {
2403 for (int arg_i = 0; arg_i < argc; arg_i++) {
2404 int arg = bootstrap_argument_index_at(index, arg_i);
2405 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2406 }
2407 st->print("}");
2408 }
2409 }
2410 break;
2411 default:
2412 ShouldNotReachHere();
2413 break;
2414 }
2415 st->cr();
2416 }
2417
2418 void ConstantPool::print_value_on(outputStream* st) const {
2419 assert(is_constantPool(), "must be constantPool");
2420 st->print("constant pool [%d]", length());
2421 if (has_preresolution()) st->print("/preresolution");
2422 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2423 print_address_on(st);
2424 if (pool_holder() != NULL) {
2425 st->print(" for ");
2426 pool_holder()->print_value_on(st);
2427 bool extra = (pool_holder()->constants() != this);
2428 if (extra) st->print(" (extra)");
2429 }
2430 if (cache() != NULL) {
2431 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2432 }
2433 }
2434
2435 // Verification
2436
2437 void ConstantPool::verify_on(outputStream* st) {
2438 guarantee(is_constantPool(), "object must be constant pool");
2439 for (int i = 0; i< length(); i++) {
2440 constantTag tag = tag_at(i);
2441 if (tag.is_klass() || tag.is_unresolved_klass()) {
2442 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2443 } else if (tag.is_symbol()) {
2444 Symbol* entry = symbol_at(i);
2445 guarantee(entry->refcount() != 0, "should have nonzero reference count");
2446 } else if (tag.is_string()) {
2447 Symbol* entry = unresolved_string_at(i);
2448 guarantee(entry->refcount() != 0, "should have nonzero reference count");
2449 }
2450 }
2451 if (pool_holder() != NULL) {
2452 // Note: pool_holder() can be NULL in temporary constant pools
2453 // used during constant pool merging
2454 guarantee(pool_holder()->is_klass(), "should be klass");
2455 }
2456 }
2457
2458
2459 SymbolHashMap::~SymbolHashMap() {
2460 SymbolHashMapEntry* next;
2461 for (int i = 0; i < _table_size; i++) {
2462 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
2463 next = cur->next();
2464 delete(cur);
2465 }
2466 }
2467 FREE_C_HEAP_ARRAY(SymbolHashMapBucket, _buckets);
2468 }
2469
2470 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2471 char *str = sym->as_utf8();
2472 unsigned int hash = compute_hash(str, sym->utf8_length());
2473 unsigned int index = hash % table_size();
2474
2475 // check if already in map
2476 // we prefer the first entry since it is more likely to be what was used in
2477 // the class file
2478 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2479 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2480 if (en->hash() == hash && en->symbol() == sym) {
2481 return; // already there
2482 }
2483 }
2484
2485 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2486 entry->set_next(bucket(index));
2487 _buckets[index].set_entry(entry);
2488 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2489 }
2490
2491 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2492 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2493 char *str = sym->as_utf8();
2494 int len = sym->utf8_length();
2495 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2496 unsigned int index = hash % table_size();
2497 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2498 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2499 if (en->hash() == hash && en->symbol() == sym) {
2500 return en;
2501 }
2502 }
2503 return NULL;
2504 }
2505
2506 void SymbolHashMap::initialize_table(int table_size) {
2507 _table_size = table_size;
2508 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
2509 for (int index = 0; index < table_size; index++) {
2510 _buckets[index].clear();
2511 }
2512 }