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 "memory/allocation.inline.hpp"
36 #include "memory/heapShared.hpp"
37 #include "memory/metadataFactory.hpp"
38 #include "memory/metaspaceClosure.hpp"
39 #include "memory/metaspaceShared.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.hpp"
43 #include "oops/array.hpp"
44 #include "oops/constantPool.inline.hpp"
45 #include "oops/cpCache.inline.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/objArrayKlass.hpp"
48 #include "oops/objArrayOop.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/typeArrayOop.inline.hpp"
51 #include "oops/valueArrayKlass.hpp"
52 #include "runtime/atomic.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/init.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/signature.hpp"
57 #include "runtime/thread.inline.hpp"
58 #include "runtime/vframe.inline.hpp"
59 #include "utilities/copy.hpp"
60
61 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
62 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
63 int size = ConstantPool::size(length);
64 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
65 }
66
67 #ifdef ASSERT
68
69 // MetaspaceObj allocation invariant is calloc equivalent memory
70 // simple verification of this here (JVM_CONSTANT_Invalid == 0 )
71 static bool tag_array_is_zero_initialized(Array<u1>* tags) {
72 assert(tags != NULL, "invariant");
73 const int length = tags->length();
74 for (int index = 0; index < length; ++index) {
75 if (JVM_CONSTANT_Invalid != tags->at(index)) {
76 return false;
77 }
78 }
79 return true;
80 }
81
82 #endif
83
84 ConstantPool::ConstantPool(Array<u1>* tags) :
85 _tags(tags),
86 _length(tags->length()) {
87
88 assert(_tags != NULL, "invariant");
89 assert(tags->length() == _length, "invariant");
90 assert(tag_array_is_zero_initialized(tags), "invariant");
91 assert(0 == flags(), "invariant");
92 assert(0 == version(), "invariant");
93 assert(NULL == _pool_holder, "invariant");
94 }
95
96 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
97 if (cache() != NULL) {
98 MetadataFactory::free_metadata(loader_data, cache());
99 set_cache(NULL);
100 }
101
102 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses());
103 set_resolved_klasses(NULL);
104
105 MetadataFactory::free_array<jushort>(loader_data, operands());
106 set_operands(NULL);
107
108 release_C_heap_structures();
109
110 // free tag array
111 MetadataFactory::free_array<u1>(loader_data, tags());
112 set_tags(NULL);
113 }
114
115 void ConstantPool::release_C_heap_structures() {
116 // walk constant pool and decrement symbol reference counts
117 unreference_symbols();
118 }
119
120 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) {
121 log_trace(cds)("Iter(ConstantPool): %p", this);
122
123 it->push(&_tags, MetaspaceClosure::_writable);
124 it->push(&_cache);
125 it->push(&_pool_holder);
126 it->push(&_operands);
127 it->push(&_resolved_klasses, MetaspaceClosure::_writable);
128
129 for (int i = 0; i < length(); i++) {
130 // The only MSO's embedded in the CP entries are Symbols:
131 // JVM_CONSTANT_String (normal and pseudo)
132 // JVM_CONSTANT_Utf8
133 constantTag ctag = tag_at(i);
134 if (ctag.is_string() || ctag.is_utf8()) {
135 it->push(symbol_at_addr(i));
136 }
137 }
138 }
139
140 objArrayOop ConstantPool::resolved_references() const {
141 return (objArrayOop)_cache->resolved_references();
142 }
143
144 // Called from outside constant pool resolution where a resolved_reference array
145 // may not be present.
146 objArrayOop ConstantPool::resolved_references_or_null() const {
147 if (_cache == NULL) {
148 return NULL;
149 } else {
150 return (objArrayOop)_cache->resolved_references();
151 }
152 }
153
154 // Create resolved_references array and mapping array for original cp indexes
155 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
156 // to map it back for resolving and some unlikely miscellaneous uses.
157 // The objects created by invokedynamic are appended to this list.
158 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
159 const intStack& reference_map,
160 int constant_pool_map_length,
161 TRAPS) {
162 // Initialized the resolved object cache.
163 int map_length = reference_map.length();
164 if (map_length > 0) {
165 // Only need mapping back to constant pool entries. The map isn't used for
166 // invokedynamic resolved_reference entries. For invokedynamic entries,
167 // the constant pool cache index has the mapping back to both the constant
168 // pool and to the resolved reference index.
169 if (constant_pool_map_length > 0) {
170 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
171
172 for (int i = 0; i < constant_pool_map_length; i++) {
173 int x = reference_map.at(i);
174 assert(x == (int)(jushort) x, "klass index is too big");
175 om->at_put(i, (jushort)x);
176 }
177 set_reference_map(om);
178 }
179
180 // Create Java array for holding resolved strings, methodHandles,
181 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
182 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
183 Handle refs_handle (THREAD, (oop)stom); // must handleize.
184 set_resolved_references(loader_data->add_handle(refs_handle));
185 }
186 }
187
188 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) {
189 // A ConstantPool can't possibly have 0xffff valid class entries,
190 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8
191 // entry for the class's name. So at most we will have 0xfffe class entries.
192 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate
193 // UnresolvedKlass entries that are temporarily created during class redefinition.
194 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity");
195 assert(resolved_klasses() == NULL, "sanity");
196 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK);
197 set_resolved_klasses(rk);
198 }
199
200 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) {
201 int len = length();
202 int num_klasses = 0;
203 for (int i = 1; i <len; i++) {
204 switch (tag_at(i).value()) {
205 case JVM_CONSTANT_ClassIndex:
206 {
207 const int class_index = klass_index_at(i);
208 unresolved_klass_at_put(i, class_index, num_klasses++);
209 }
210 break;
211 #ifndef PRODUCT
212 case JVM_CONSTANT_Class:
213 case JVM_CONSTANT_UnresolvedClass:
214 case JVM_CONSTANT_UnresolvedClassInError:
215 // All of these should have been reverted back to Unresolved before calling
216 // this function.
217 ShouldNotReachHere();
218 #endif
219 }
220 }
221 allocate_resolved_klasses(loader_data, num_klasses, THREAD);
222 }
223
224 // Unsafe anonymous class support:
225 void ConstantPool::klass_at_put(int class_index, int name_index, int resolved_klass_index, Klass* k, Symbol* name) {
226 assert(is_within_bounds(class_index), "index out of bounds");
227 assert(is_within_bounds(name_index), "index out of bounds");
228 assert((resolved_klass_index & 0xffff0000) == 0, "must be");
229 *int_at_addr(class_index) =
230 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index);
231
232 symbol_at_put(name_index, name);
233 name->increment_refcount();
234 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
235 Atomic::release_store(adr, k);
236
237 // The interpreter assumes when the tag is stored, the klass is resolved
238 // and the Klass* non-NULL, so we need hardware store ordering here.
239 jbyte qdesc_bit = (name->is_Q_signature()) ? (jbyte) JVM_CONSTANT_QDescBit : 0;
240 if (k != NULL) {
241 release_tag_at_put(class_index, JVM_CONSTANT_Class | qdesc_bit);
242 } else {
243 release_tag_at_put(class_index, JVM_CONSTANT_UnresolvedClass | qdesc_bit);
244 }
245 }
246
247 // Unsafe anonymous class support:
248 void ConstantPool::klass_at_put(int class_index, Klass* k) {
249 assert(k != NULL, "must be valid klass");
250 CPKlassSlot kslot = klass_slot_at(class_index);
251 int resolved_klass_index = kslot.resolved_klass_index();
252 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index);
253 Atomic::release_store(adr, k);
254
255 // The interpreter assumes when the tag is stored, the klass is resolved
256 // and the Klass* non-NULL, so we need hardware store ordering here.
257 assert(!k->name()->is_Q_signature(), "Q-type without JVM_CONSTANT_QDescBit");
258 release_tag_at_put(class_index, JVM_CONSTANT_Class);
259 }
260
261 #if INCLUDE_CDS_JAVA_HEAP
262 // Archive the resolved references
263 void ConstantPool::archive_resolved_references(Thread* THREAD) {
264 if (_cache == NULL) {
265 return; // nothing to do
266 }
267
268 InstanceKlass *ik = pool_holder();
269 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() ||
270 ik->is_shared_app_class())) {
271 // Archiving resolved references for classes from non-builtin loaders
272 // is not yet supported.
273 set_resolved_references(NULL);
274 return;
275 }
276
277 objArrayOop rr = resolved_references();
278 Array<u2>* ref_map = reference_map();
279 if (rr != NULL) {
280 int ref_map_len = ref_map == NULL ? 0 : ref_map->length();
281 int rr_len = rr->length();
282 for (int i = 0; i < rr_len; i++) {
283 oop p = rr->obj_at(i);
284 rr->obj_at_put(i, NULL);
285 if (p != NULL && i < ref_map_len) {
286 int index = object_to_cp_index(i);
287 if (tag_at(index).is_string()) {
288 oop op = StringTable::create_archived_string(p, THREAD);
289 // If the String object is not archived (possibly too large),
290 // NULL is returned. Also set it in the array, so we won't
291 // have a 'bad' reference in the archived resolved_reference
292 // array.
293 rr->obj_at_put(i, op);
294 }
295 }
296 }
297
298 oop archived = HeapShared::archive_heap_object(rr, THREAD);
299 // If the resolved references array is not archived (too large),
300 // the 'archived' object is NULL. No need to explicitly check
301 // the return value of archive_heap_object here. At runtime, the
302 // resolved references will be created using the normal process
303 // when there is no archived value.
304 _cache->set_archived_references(archived);
305 set_resolved_references(NULL);
306 }
307 }
308
309 void ConstantPool::resolve_class_constants(TRAPS) {
310 assert(DumpSharedSpaces, "used during dump time only");
311 // The _cache may be NULL if the _pool_holder klass fails verification
312 // at dump time due to missing dependencies.
313 if (cache() == NULL || reference_map() == NULL) {
314 return; // nothing to do
315 }
316
317 constantPoolHandle cp(THREAD, this);
318 for (int index = 1; index < length(); index++) { // Index 0 is unused
319 if (tag_at(index).is_string() && !cp->is_pseudo_string_at(index)) {
320 int cache_index = cp->cp_to_object_index(index);
321 string_at_impl(cp, index, cache_index, CHECK);
322 }
323 }
324 }
325 #endif
326
327 // CDS support. Create a new resolved_references array.
328 void ConstantPool::restore_unshareable_info(TRAPS) {
329 assert(is_constantPool(), "ensure C++ vtable is restored");
330 assert(on_stack(), "should always be set for shared constant pools");
331 assert(is_shared(), "should always be set for shared constant pools");
332 assert(_cache != NULL, "constant pool _cache should not be NULL");
333
334 // Only create the new resolved references array if it hasn't been attempted before
335 if (resolved_references() != NULL) return;
336
337 // restore the C++ vtable from the shared archive
338 restore_vtable();
339
340 if (SystemDictionary::Object_klass_loaded()) {
341 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
342 #if INCLUDE_CDS_JAVA_HEAP
343 if (HeapShared::open_archive_heap_region_mapped() &&
344 _cache->archived_references() != NULL) {
345 oop archived = _cache->archived_references();
346 // Create handle for the archived resolved reference array object
347 Handle refs_handle(THREAD, archived);
348 set_resolved_references(loader_data->add_handle(refs_handle));
349 } else
350 #endif
351 {
352 // No mapped archived resolved reference array
353 // Recreate the object array and add to ClassLoaderData.
354 int map_length = resolved_reference_length();
355 if (map_length > 0) {
356 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
357 Handle refs_handle(THREAD, (oop)stom); // must handleize.
358 set_resolved_references(loader_data->add_handle(refs_handle));
359 }
360 }
361 }
362 }
363
364 void ConstantPool::remove_unshareable_info() {
365 // Resolved references are not in the shared archive.
366 // Save the length for restoration. It is not necessarily the same length
367 // as reference_map.length() if invokedynamic is saved. It is needed when
368 // re-creating the resolved reference array if archived heap data cannot be map
369 // at runtime.
370 set_resolved_reference_length(
371 resolved_references() != NULL ? resolved_references()->length() : 0);
372
373 // If archiving heap objects is not allowed, clear the resolved references.
374 // Otherwise, it is cleared after the resolved references array is cached
375 // (see archive_resolved_references()).
376 // If DynamicDumpSharedSpaces is enabled, clear the resolved references also
377 // as java objects are not archived in the top layer.
378 if (!HeapShared::is_heap_object_archiving_allowed() || DynamicDumpSharedSpaces) {
379 set_resolved_references(NULL);
380 }
381
382 // Shared ConstantPools are in the RO region, so the _flags cannot be modified.
383 // The _on_stack flag is used to prevent ConstantPools from deallocation during
384 // class redefinition. Since shared ConstantPools cannot be deallocated anyway,
385 // we always set _on_stack to true to avoid having to change _flags during runtime.
386 _flags |= (_on_stack | _is_shared);
387 int num_klasses = 0;
388 for (int index = 1; index < length(); index++) { // Index 0 is unused
389 if (!DynamicDumpSharedSpaces) {
390 assert(!tag_at(index).is_unresolved_klass_in_error(), "This must not happen during static dump time");
391 } else {
392 if (tag_at(index).is_unresolved_klass_in_error() ||
393 tag_at(index).is_method_handle_in_error() ||
394 tag_at(index).is_method_type_in_error() ||
395 tag_at(index).is_dynamic_constant_in_error()) {
396 tag_at_put(index, JVM_CONSTANT_UnresolvedClass);
397 }
398 }
399 if (tag_at(index).is_klass()) {
400 // This class was resolved as a side effect of executing Java code
401 // during dump time. We need to restore it back to an UnresolvedClass,
402 // so that the proper class loading and initialization can happen
403 // at runtime.
404 CPKlassSlot kslot = klass_slot_at(index);
405 int resolved_klass_index = kslot.resolved_klass_index();
406 int name_index = kslot.name_index();
407 assert(tag_at(name_index).is_symbol(), "sanity");
408 resolved_klasses()->at_put(resolved_klass_index, NULL);
409 tag_at_put(index, JVM_CONSTANT_UnresolvedClass);
410 assert(klass_name_at(index) == symbol_at(name_index), "sanity");
411 }
412 }
413 if (cache() != NULL) {
414 cache()->remove_unshareable_info();
415 }
416 }
417
418 int ConstantPool::cp_to_object_index(int cp_index) {
419 // this is harder don't do this so much.
420 int i = reference_map()->find(cp_index);
421 // We might not find the index for jsr292 call.
422 return (i < 0) ? _no_index_sentinel : i;
423 }
424
425 void ConstantPool::string_at_put(int which, int obj_index, oop str) {
426 resolved_references()->obj_at_put(obj_index, str);
427 }
428
429 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) {
430 ResourceMark rm;
431 int line_number = -1;
432 const char * source_file = NULL;
433 if (JavaThread::current()->has_last_Java_frame()) {
434 // try to identify the method which called this function.
435 vframeStream vfst(JavaThread::current());
436 if (!vfst.at_end()) {
437 line_number = vfst.method()->line_number_from_bci(vfst.bci());
438 Symbol* s = vfst.method()->method_holder()->source_file_name();
439 if (s != NULL) {
440 source_file = s->as_C_string();
441 }
442 }
443 }
444 if (k != this_cp->pool_holder()) {
445 // only print something if the classes are different
446 if (source_file != NULL) {
447 log_debug(class, resolve)("%s %s %s:%d",
448 this_cp->pool_holder()->external_name(),
449 k->external_name(), source_file, line_number);
450 } else {
451 log_debug(class, resolve)("%s %s",
452 this_cp->pool_holder()->external_name(),
453 k->external_name());
454 }
455 }
456 }
457
458 void check_is_value_type(Klass* k, TRAPS) {
459 if (!k->is_value()) {
460 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
461 }
462 }
463
464 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which,
465 bool save_resolution_error, TRAPS) {
466 assert(THREAD->is_Java_thread(), "must be a Java thread");
467 JavaThread* javaThread = (JavaThread*)THREAD;
468
469 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
470 // It is not safe to rely on the tag bit's here, since we don't have a lock, and
471 // the entry and tag is not updated atomicly.
472 CPKlassSlot kslot = this_cp->klass_slot_at(which);
473 int resolved_klass_index = kslot.resolved_klass_index();
474 int name_index = kslot.name_index();
475 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
476
477 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index);
478 if (klass != NULL) {
479 return klass;
480 }
481
482 // This tag doesn't change back to unresolved class unless at a safepoint.
483 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) {
484 // The original attempt to resolve this constant pool entry failed so find the
485 // class of the original error and throw another error of the same class
486 // (JVMS 5.4.3).
487 // If there is a detail message, pass that detail message to the error.
488 // The JVMS does not strictly require us to duplicate the same detail message,
489 // or any internal exception fields such as cause or stacktrace. But since the
490 // detail message is often a class name or other literal string, we will repeat it
491 // if we can find it in the symbol table.
492 throw_resolution_error(this_cp, which, CHECK_NULL);
493 ShouldNotReachHere();
494 }
495
496 Handle mirror_handle;
497 Symbol* name = this_cp->symbol_at(name_index);
498 bool value_type_signature = false;
499 if (name->is_Q_signature()) {
500 name = name->fundamental_name(THREAD);
501 value_type_signature = true;
502 }
503 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
504 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
505
506 Klass* k;
507 {
508 // Turn off the single stepping while doing class resolution
509 JvmtiHideSingleStepping jhss(javaThread);
510 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
511 } // JvmtiHideSingleStepping jhss(javaThread);
512 if (value_type_signature) {
513 name->decrement_refcount();
514 }
515
516 if (!HAS_PENDING_EXCEPTION) {
517 // preserve the resolved klass from unloading
518 mirror_handle = Handle(THREAD, k->java_mirror());
519 // Do access check for klasses
520 verify_constant_pool_resolve(this_cp, k, THREAD);
521 }
522
523 if (!HAS_PENDING_EXCEPTION && value_type_signature) {
524 check_is_value_type(k, THREAD);
525 }
526
527 if (!HAS_PENDING_EXCEPTION) {
528 Klass* bottom_klass = NULL;
529 if (k->is_objArray_klass()) {
530 bottom_klass = ObjArrayKlass::cast(k)->bottom_klass();
531 assert(bottom_klass != NULL, "Should be set");
532 assert(bottom_klass->is_instance_klass() || bottom_klass->is_typeArray_klass(), "Sanity check");
533 } else if (k->is_valueArray_klass()) {
534 bottom_klass = ValueArrayKlass::cast(k)->element_klass();
535 assert(bottom_klass != NULL, "Should be set");
536 }
537 }
538
539 // Failed to resolve class. We must record the errors so that subsequent attempts
540 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
541 if (HAS_PENDING_EXCEPTION) {
542 if (save_resolution_error) {
543 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
544 // If CHECK_NULL above doesn't return the exception, that means that
545 // some other thread has beaten us and has resolved the class.
546 // To preserve old behavior, we return the resolved class.
547 klass = this_cp->resolved_klasses()->at(resolved_klass_index);
548 assert(klass != NULL, "must be resolved if exception was cleared");
549 return klass;
550 } else {
551 return NULL; // return the pending exception
552 }
553 }
554
555 // logging for class+resolve.
556 if (log_is_enabled(Debug, class, resolve)){
557 trace_class_resolution(this_cp, k);
558 }
559 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
560 Atomic::release_store(adr, k);
561 // The interpreter assumes when the tag is stored, the klass is resolved
562 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
563 // hardware store ordering here.
564 jbyte tag = JVM_CONSTANT_Class;
565 if (this_cp->tag_at(which).is_Qdescriptor_klass()) {
566 tag |= JVM_CONSTANT_QDescBit;
567 }
568 this_cp->release_tag_at_put(which, tag);
569 return k;
570 }
571
572
573 // Does not update ConstantPool* - to avoid any exception throwing. Used
574 // by compiler and exception handling. Also used to avoid classloads for
575 // instanceof operations. Returns NULL if the class has not been loaded or
576 // if the verification of constant pool failed
577 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
578 CPKlassSlot kslot = this_cp->klass_slot_at(which);
579 int resolved_klass_index = kslot.resolved_klass_index();
580 int name_index = kslot.name_index();
581 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
582
583 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
584 if (k != NULL) {
585 return k;
586 } else {
587 Thread *thread = Thread::current();
588 Symbol* name = this_cp->symbol_at(name_index);
589 oop loader = this_cp->pool_holder()->class_loader();
590 oop protection_domain = this_cp->pool_holder()->protection_domain();
591 Handle h_prot (thread, protection_domain);
592 Handle h_loader (thread, loader);
593 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
594
595 // Avoid constant pool verification at a safepoint, which takes the Module_lock.
596 if (k != NULL && !SafepointSynchronize::is_at_safepoint()) {
597 // Make sure that resolving is legal
598 EXCEPTION_MARK;
599 // return NULL if verification fails
600 verify_constant_pool_resolve(this_cp, k, THREAD);
601 if (HAS_PENDING_EXCEPTION) {
602 CLEAR_PENDING_EXCEPTION;
603 return NULL;
604 }
605 return k;
606 } else {
607 return k;
608 }
609 }
610 }
611
612 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
613 int which) {
614 if (cpool->cache() == NULL) return NULL; // nothing to load yet
615 int cache_index = decode_cpcache_index(which, true);
616 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
617 // FIXME: should be an assert
618 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
619 return NULL;
620 }
621 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
622 return e->method_if_resolved(cpool);
623 }
624
625
626 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
627 if (cpool->cache() == NULL) return false; // nothing to load yet
628 int cache_index = decode_cpcache_index(which, true);
629 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
630 return e->has_appendix();
631 }
632
633 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
634 if (cpool->cache() == NULL) return NULL; // nothing to load yet
635 int cache_index = decode_cpcache_index(which, true);
636 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
637 return e->appendix_if_resolved(cpool);
638 }
639
640
641 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) {
642 if (cpool->cache() == NULL) return false; // nothing to load yet
643 int cache_index = decode_cpcache_index(which, true);
644 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
645 return e->has_local_signature();
646 }
647
648 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
649 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
650 return symbol_at(name_index);
651 }
652
653
654 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
655 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
656 return symbol_at(signature_index);
657 }
658
659 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
660 int i = which;
661 if (!uncached && cache() != NULL) {
662 if (ConstantPool::is_invokedynamic_index(which)) {
663 // Invokedynamic index is index into the constant pool cache
664 int pool_index = invokedynamic_bootstrap_ref_index_at(which);
665 pool_index = bootstrap_name_and_type_ref_index_at(pool_index);
666 assert(tag_at(pool_index).is_name_and_type(), "");
667 return pool_index;
668 }
669 // change byte-ordering and go via cache
670 i = remap_instruction_operand_from_cache(which);
671 } else {
672 if (tag_at(which).has_bootstrap()) {
673 int pool_index = bootstrap_name_and_type_ref_index_at(which);
674 assert(tag_at(pool_index).is_name_and_type(), "");
675 return pool_index;
676 }
677 }
678 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
679 assert(!tag_at(i).has_bootstrap(), "Must be handled above");
680 jint ref_index = *int_at_addr(i);
681 return extract_high_short_from_int(ref_index);
682 }
683
684 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
685 int pool_index = which;
686 if (!uncached && cache() != NULL) {
687 if (ConstantPool::is_invokedynamic_index(which)) {
688 // Invokedynamic index is index into resolved_references
689 pool_index = invokedynamic_bootstrap_ref_index_at(which);
690 } else {
691 // change byte-ordering and go via cache
692 pool_index = remap_instruction_operand_from_cache(which);
693 }
694 }
695 return tag_at(pool_index);
696 }
697
698 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
699 guarantee(!ConstantPool::is_invokedynamic_index(which),
700 "an invokedynamic instruction does not have a klass");
701 int i = which;
702 if (!uncached && cache() != NULL) {
703 // change byte-ordering and go via cache
704 i = remap_instruction_operand_from_cache(which);
705 }
706 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
707 jint ref_index = *int_at_addr(i);
708 return extract_low_short_from_int(ref_index);
709 }
710
711
712
713 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
714 int cpc_index = operand;
715 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
716 assert((int)(u2)cpc_index == cpc_index, "clean u2");
717 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
718 return member_index;
719 }
720
721
722 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
723 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
724 return; // short cut, typeArray klass is always accessible
725 }
726 Klass* holder = this_cp->pool_holder();
727 LinkResolver::check_klass_accessibility(holder, k, CHECK);
728 }
729
730
731 int ConstantPool::name_ref_index_at(int which_nt) {
732 jint ref_index = name_and_type_at(which_nt);
733 return extract_low_short_from_int(ref_index);
734 }
735
736
737 int ConstantPool::signature_ref_index_at(int which_nt) {
738 jint ref_index = name_and_type_at(which_nt);
739 return extract_high_short_from_int(ref_index);
740 }
741
742
743 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
744 return klass_at(klass_ref_index_at(which), THREAD);
745 }
746
747 Symbol* ConstantPool::klass_name_at(int which) const {
748 return symbol_at(klass_slot_at(which).name_index());
749 }
750
751 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
752 jint ref_index = klass_ref_index_at(which);
753 return klass_at_noresolve(ref_index);
754 }
755
756 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
757 jint ref_index = uncached_klass_ref_index_at(which);
758 return klass_at_noresolve(ref_index);
759 }
760
761 char* ConstantPool::string_at_noresolve(int which) {
762 return unresolved_string_at(which)->as_C_string();
763 }
764
765 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
766 return Signature::basic_type(symbol_at(which));
767 }
768
769
770 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
771 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
772 if (this_cp->tag_at(index).is_string()) {
773 this_cp->string_at(index, CHECK);
774 }
775 }
776 }
777
778 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
779 // Dig out the detailed message to reuse if possible
780 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
781 if (message != NULL) {
782 return message;
783 }
784
785 // Return specific message for the tag
786 switch (tag.value()) {
787 case JVM_CONSTANT_UnresolvedClass:
788 // return the class name in the error message
789 message = this_cp->klass_name_at(which);
790 break;
791 case JVM_CONSTANT_MethodHandle:
792 // return the method handle name in the error message
793 message = this_cp->method_handle_name_ref_at(which);
794 break;
795 case JVM_CONSTANT_MethodType:
796 // return the method type signature in the error message
797 message = this_cp->method_type_signature_at(which);
798 break;
799 case JVM_CONSTANT_Dynamic:
800 // return the name of the condy in the error message
801 message = this_cp->uncached_name_ref_at(which);
802 break;
803 default:
804 ShouldNotReachHere();
805 }
806
807 return message;
808 }
809
810 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
811 Symbol* message = NULL;
812 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
813 assert(error != NULL, "checking");
814 CLEAR_PENDING_EXCEPTION;
815 if (message != NULL) {
816 ResourceMark rm;
817 THROW_MSG(error, message->as_C_string());
818 } else {
819 THROW(error);
820 }
821 }
822
823 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
824 // exception in the resolution error table, so that the same exception is thrown again.
825 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
826 constantTag tag, TRAPS) {
827 Symbol* error = PENDING_EXCEPTION->klass()->name();
828
829 int error_tag = tag.error_value();
830
831 if (!PENDING_EXCEPTION->
832 is_a(SystemDictionary::LinkageError_klass())) {
833 // Just throw the exception and don't prevent these classes from
834 // being loaded due to virtual machine errors like StackOverflow
835 // and OutOfMemoryError, etc, or if the thread was hit by stop()
836 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
837 } else if (this_cp->tag_at(which).value() != error_tag) {
838 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
839 SystemDictionary::add_resolution_error(this_cp, which, error, message);
840 // CAS in the tag. If a thread beat us to registering this error that's fine.
841 // If another thread resolved the reference, this is a race condition. This
842 // thread may have had a security manager or something temporary.
843 // This doesn't deterministically get an error. So why do we save this?
844 // We save this because jvmti can add classes to the bootclass path after
845 // this error, so it needs to get the same error if the error is first.
846 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
847 (jbyte)tag.value(),
848 (jbyte)error_tag);
849 if (old_tag != error_tag && old_tag != tag.value()) {
850 // MethodHandles and MethodType doesn't change to resolved version.
851 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
852 // Forget the exception and use the resolved class.
853 CLEAR_PENDING_EXCEPTION;
854 }
855 } else {
856 // some other thread put this in error state
857 throw_resolution_error(this_cp, which, CHECK);
858 }
859 }
860
861 constantTag ConstantPool::constant_tag_at(int which) {
862 constantTag tag = tag_at(which);
863 if (tag.is_dynamic_constant() ||
864 tag.is_dynamic_constant_in_error()) {
865 BasicType bt = basic_type_for_constant_at(which);
866 // dynamic constant could return an array, treat as object
867 return constantTag::ofBasicType(is_reference_type(bt) ? T_OBJECT : bt);
868 }
869 return tag;
870 }
871
872 BasicType ConstantPool::basic_type_for_constant_at(int which) {
873 constantTag tag = tag_at(which);
874 if (tag.is_dynamic_constant() ||
875 tag.is_dynamic_constant_in_error()) {
876 // have to look at the signature for this one
877 Symbol* constant_type = uncached_signature_ref_at(which);
878 return Signature::basic_type(constant_type);
879 }
880 return tag.basic_type();
881 }
882
883 // Called to resolve constants in the constant pool and return an oop.
884 // Some constant pool entries cache their resolved oop. This is also
885 // called to create oops from constants to use in arguments for invokedynamic
886 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
887 int index, int cache_index,
888 bool* status_return, TRAPS) {
889 oop result_oop = NULL;
890 Handle throw_exception;
891
892 if (cache_index == _possible_index_sentinel) {
893 // It is possible that this constant is one which is cached in the objects.
894 // We'll do a linear search. This should be OK because this usage is rare.
895 // FIXME: If bootstrap specifiers stress this code, consider putting in
896 // a reverse index. Binary search over a short array should do it.
897 assert(index > 0, "valid index");
898 cache_index = this_cp->cp_to_object_index(index);
899 }
900 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
901 assert(index == _no_index_sentinel || index >= 0, "");
902
903 if (cache_index >= 0) {
904 result_oop = this_cp->resolved_references()->obj_at(cache_index);
905 if (result_oop != NULL) {
906 if (result_oop == Universe::the_null_sentinel()) {
907 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index)));
908 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
909 result_oop = NULL;
910 }
911 if (status_return != NULL) (*status_return) = true;
912 return result_oop;
913 // That was easy...
914 }
915 index = this_cp->object_to_cp_index(cache_index);
916 }
917
918 jvalue prim_value; // temp used only in a few cases below
919
920 constantTag tag = this_cp->tag_at(index);
921
922 if (status_return != NULL) {
923 // don't trigger resolution if the constant might need it
924 switch (tag.value()) {
925 case JVM_CONSTANT_Class:
926 {
927 CPKlassSlot kslot = this_cp->klass_slot_at(index);
928 int resolved_klass_index = kslot.resolved_klass_index();
929 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) {
930 (*status_return) = false;
931 return NULL;
932 }
933 // the klass is waiting in the CP; go get it
934 break;
935 }
936 case JVM_CONSTANT_String:
937 case JVM_CONSTANT_Integer:
938 case JVM_CONSTANT_Float:
939 case JVM_CONSTANT_Long:
940 case JVM_CONSTANT_Double:
941 // these guys trigger OOM at worst
942 break;
943 default:
944 (*status_return) = false;
945 return NULL;
946 }
947 // from now on there is either success or an OOME
948 (*status_return) = true;
949 }
950
951 switch (tag.value()) {
952
953 case JVM_CONSTANT_UnresolvedClass:
954 case JVM_CONSTANT_UnresolvedClassInError:
955 case JVM_CONSTANT_Class:
956 {
957 assert(cache_index == _no_index_sentinel, "should not have been set");
958 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
959 // ldc wants the java mirror.
960 result_oop = resolved->java_mirror();
961 break;
962 }
963
964 case JVM_CONSTANT_Dynamic:
965 {
966 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
967 BootstrapInfo bootstrap_specifier(this_cp, index);
968
969 // The initial step in resolving an unresolved symbolic reference to a
970 // dynamically-computed constant is to resolve the symbolic reference to a
971 // method handle which will be the bootstrap method for the dynamically-computed
972 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
973 // method fails, then a MethodHandleInError is stored at the corresponding
974 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
975 // set a DynamicConstantInError here since any subsequent use of this
976 // bootstrap method will encounter the resolution of MethodHandleInError.
977 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
978 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
979 // for the bootstrap_specifier created above.
980 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
981 Exceptions::wrap_dynamic_exception(THREAD);
982 if (HAS_PENDING_EXCEPTION) {
983 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
984 // will check for a LinkageError and store a DynamicConstantInError.
985 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
986 }
987 result_oop = bootstrap_specifier.resolved_value()();
988 BasicType type = Signature::basic_type(bootstrap_specifier.signature());
989 if (!is_reference_type(type)) {
990 // Make sure the primitive value is properly boxed.
991 // This is a JDK responsibility.
992 const char* fail = NULL;
993 if (result_oop == NULL) {
994 fail = "null result instead of box";
995 } else if (!is_java_primitive(type)) {
996 // FIXME: support value types via unboxing
997 fail = "can only handle references and primitives";
998 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
999 fail = "primitive is not properly boxed";
1000 }
1001 if (fail != NULL) {
1002 // Since this exception is not a LinkageError, throw exception
1003 // but do not save a DynamicInError resolution result.
1004 // See section 5.4.3 of the VM spec.
1005 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
1006 }
1007 }
1008
1009 if (TraceMethodHandles) {
1010 bootstrap_specifier.print_msg_on(tty, "resolve_constant_at_impl");
1011 }
1012 break;
1013 }
1014
1015 case JVM_CONSTANT_String:
1016 assert(cache_index != _no_index_sentinel, "should have been set");
1017 if (this_cp->is_pseudo_string_at(index)) {
1018 result_oop = this_cp->pseudo_string_at(index, cache_index);
1019 break;
1020 }
1021 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
1022 break;
1023
1024 case JVM_CONSTANT_DynamicInError:
1025 case JVM_CONSTANT_MethodHandleInError:
1026 case JVM_CONSTANT_MethodTypeInError:
1027 {
1028 throw_resolution_error(this_cp, index, CHECK_NULL);
1029 break;
1030 }
1031
1032 case JVM_CONSTANT_MethodHandle:
1033 {
1034 int ref_kind = this_cp->method_handle_ref_kind_at(index);
1035 int callee_index = this_cp->method_handle_klass_index_at(index);
1036 Symbol* name = this_cp->method_handle_name_ref_at(index);
1037 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
1038 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
1039 { ResourceMark rm(THREAD);
1040 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1041 ref_kind, index, this_cp->method_handle_index_at(index),
1042 callee_index, name->as_C_string(), signature->as_C_string());
1043 }
1044
1045 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
1046
1047 // Check constant pool method consistency
1048 if ((callee->is_interface() && m_tag.is_method()) ||
1049 ((!callee->is_interface() && m_tag.is_interface_method()))) {
1050 ResourceMark rm(THREAD);
1051 stringStream ss;
1052 ss.print("Inconsistent constant pool data in classfile for class %s. "
1053 "Method '", callee->name()->as_C_string());
1054 signature->print_as_signature_external_return_type(&ss);
1055 ss.print(" %s(", name->as_C_string());
1056 signature->print_as_signature_external_parameters(&ss);
1057 ss.print(")' at index %d is %s and should be %s",
1058 index,
1059 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1060 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1061 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1062 }
1063
1064 Klass* klass = this_cp->pool_holder();
1065 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1066 callee, name, signature,
1067 THREAD);
1068 result_oop = value();
1069 if (HAS_PENDING_EXCEPTION) {
1070 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1071 }
1072 break;
1073 }
1074
1075 case JVM_CONSTANT_MethodType:
1076 {
1077 Symbol* signature = this_cp->method_type_signature_at(index);
1078 { ResourceMark rm(THREAD);
1079 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1080 index, this_cp->method_type_index_at(index),
1081 signature->as_C_string());
1082 }
1083 Klass* klass = this_cp->pool_holder();
1084 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1085 result_oop = value();
1086 if (HAS_PENDING_EXCEPTION) {
1087 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1088 }
1089 break;
1090 }
1091
1092 case JVM_CONSTANT_Integer:
1093 assert(cache_index == _no_index_sentinel, "should not have been set");
1094 prim_value.i = this_cp->int_at(index);
1095 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1096 break;
1097
1098 case JVM_CONSTANT_Float:
1099 assert(cache_index == _no_index_sentinel, "should not have been set");
1100 prim_value.f = this_cp->float_at(index);
1101 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1102 break;
1103
1104 case JVM_CONSTANT_Long:
1105 assert(cache_index == _no_index_sentinel, "should not have been set");
1106 prim_value.j = this_cp->long_at(index);
1107 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1108 break;
1109
1110 case JVM_CONSTANT_Double:
1111 assert(cache_index == _no_index_sentinel, "should not have been set");
1112 prim_value.d = this_cp->double_at(index);
1113 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1114 break;
1115
1116 default:
1117 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
1118 this_cp(), index, cache_index, tag.value()));
1119 assert(false, "unexpected constant tag");
1120 break;
1121 }
1122
1123 if (cache_index >= 0) {
1124 // Benign race condition: resolved_references may already be filled in.
1125 // The important thing here is that all threads pick up the same result.
1126 // It doesn't matter which racing thread wins, as long as only one
1127 // result is used by all threads, and all future queries.
1128 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop);
1129 oop old_result = this_cp->resolved_references()
1130 ->atomic_compare_exchange_oop(cache_index, new_result, NULL);
1131 if (old_result == NULL) {
1132 return result_oop; // was installed
1133 } else {
1134 // Return the winning thread's result. This can be different than
1135 // the result here for MethodHandles.
1136 if (old_result == Universe::the_null_sentinel())
1137 old_result = NULL;
1138 return old_result;
1139 }
1140 } else {
1141 assert(result_oop != Universe::the_null_sentinel(), "");
1142 return result_oop;
1143 }
1144 }
1145
1146 oop ConstantPool::uncached_string_at(int which, TRAPS) {
1147 Symbol* sym = unresolved_string_at(which);
1148 oop str = StringTable::intern(sym, CHECK_(NULL));
1149 assert(java_lang_String::is_instance(str), "must be string");
1150 return str;
1151 }
1152
1153 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index,
1154 int start_arg, int end_arg,
1155 objArrayHandle info, int pos,
1156 bool must_resolve, Handle if_not_available,
1157 TRAPS) {
1158 int argc;
1159 int limit = pos + end_arg - start_arg;
1160 // checks: index in range [0..this_cp->length),
1161 // tag at index, start..end in range [0..argc],
1162 // info array non-null, pos..limit in [0..info.length]
1163 if ((0 >= index || index >= this_cp->length()) ||
1164 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1165 this_cp->tag_at(index).is_dynamic_constant()) ||
1166 (0 > start_arg || start_arg > end_arg) ||
1167 (end_arg > (argc = this_cp->bootstrap_argument_count_at(index))) ||
1168 (0 > pos || pos > limit) ||
1169 (info.is_null() || limit > info->length())) {
1170 // An index or something else went wrong; throw an error.
1171 // Since this is an internal API, we don't expect this,
1172 // so we don't bother to craft a nice message.
1173 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1174 }
1175 // now we can loop safely
1176 int info_i = pos;
1177 for (int i = start_arg; i < end_arg; i++) {
1178 int arg_index = this_cp->bootstrap_argument_index_at(index, i);
1179 oop arg_oop;
1180 if (must_resolve) {
1181 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1182 } else {
1183 bool found_it = false;
1184 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1185 if (!found_it) arg_oop = if_not_available();
1186 }
1187 info->obj_at_put(info_i++, arg_oop);
1188 }
1189 }
1190
1191 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1192 // If the string has already been interned, this entry will be non-null
1193 oop str = this_cp->resolved_references()->obj_at(obj_index);
1194 assert(str != Universe::the_null_sentinel(), "");
1195 if (str != NULL) return str;
1196 Symbol* sym = this_cp->unresolved_string_at(which);
1197 str = StringTable::intern(sym, CHECK_(NULL));
1198 this_cp->string_at_put(which, obj_index, str);
1199 assert(java_lang_String::is_instance(str), "must be string");
1200 return str;
1201 }
1202
1203
1204 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1205 // Names are interned, so we can compare Symbol*s directly
1206 Symbol* cp_name = klass_name_at(which);
1207 return (cp_name == k->name());
1208 }
1209
1210
1211 // Iterate over symbols and decrement ones which are Symbol*s
1212 // This is done during GC.
1213 // Only decrement the UTF8 symbols. Strings point to
1214 // these symbols but didn't increment the reference count.
1215 void ConstantPool::unreference_symbols() {
1216 for (int index = 1; index < length(); index++) { // Index 0 is unused
1217 constantTag tag = tag_at(index);
1218 if (tag.is_symbol()) {
1219 symbol_at(index)->decrement_refcount();
1220 }
1221 }
1222 }
1223
1224
1225 // Compare this constant pool's entry at index1 to the constant pool
1226 // cp2's entry at index2.
1227 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1228 int index2, TRAPS) {
1229
1230 // The error tags are equivalent to non-error tags when comparing
1231 jbyte t1 = tag_at(index1).non_error_value();
1232 jbyte t2 = cp2->tag_at(index2).non_error_value();
1233
1234 if (t1 != t2) {
1235 // Not the same entry type so there is nothing else to check. Note
1236 // that this style of checking will consider resolved/unresolved
1237 // class pairs as different.
1238 // From the ConstantPool* API point of view, this is correct
1239 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1240 // plays out in the context of ConstantPool* merging.
1241 return false;
1242 }
1243
1244 switch (t1) {
1245 case JVM_CONSTANT_Class:
1246 {
1247 Klass* k1 = klass_at(index1, CHECK_false);
1248 Klass* k2 = cp2->klass_at(index2, CHECK_false);
1249 if (k1 == k2) {
1250 return true;
1251 }
1252 } break;
1253
1254 case JVM_CONSTANT_ClassIndex:
1255 {
1256 int recur1 = klass_index_at(index1);
1257 int recur2 = cp2->klass_index_at(index2);
1258 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1259 if (match) {
1260 return true;
1261 }
1262 } break;
1263
1264 case JVM_CONSTANT_Double:
1265 {
1266 jdouble d1 = double_at(index1);
1267 jdouble d2 = cp2->double_at(index2);
1268 if (d1 == d2) {
1269 return true;
1270 }
1271 } break;
1272
1273 case JVM_CONSTANT_Fieldref:
1274 case JVM_CONSTANT_InterfaceMethodref:
1275 case JVM_CONSTANT_Methodref:
1276 {
1277 int recur1 = uncached_klass_ref_index_at(index1);
1278 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1279 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1280 if (match) {
1281 recur1 = uncached_name_and_type_ref_index_at(index1);
1282 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1283 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1284 if (match) {
1285 return true;
1286 }
1287 }
1288 } break;
1289
1290 case JVM_CONSTANT_Float:
1291 {
1292 jfloat f1 = float_at(index1);
1293 jfloat f2 = cp2->float_at(index2);
1294 if (f1 == f2) {
1295 return true;
1296 }
1297 } break;
1298
1299 case JVM_CONSTANT_Integer:
1300 {
1301 jint i1 = int_at(index1);
1302 jint i2 = cp2->int_at(index2);
1303 if (i1 == i2) {
1304 return true;
1305 }
1306 } break;
1307
1308 case JVM_CONSTANT_Long:
1309 {
1310 jlong l1 = long_at(index1);
1311 jlong l2 = cp2->long_at(index2);
1312 if (l1 == l2) {
1313 return true;
1314 }
1315 } break;
1316
1317 case JVM_CONSTANT_NameAndType:
1318 {
1319 int recur1 = name_ref_index_at(index1);
1320 int recur2 = cp2->name_ref_index_at(index2);
1321 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1322 if (match) {
1323 recur1 = signature_ref_index_at(index1);
1324 recur2 = cp2->signature_ref_index_at(index2);
1325 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1326 if (match) {
1327 return true;
1328 }
1329 }
1330 } break;
1331
1332 case JVM_CONSTANT_StringIndex:
1333 {
1334 int recur1 = string_index_at(index1);
1335 int recur2 = cp2->string_index_at(index2);
1336 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1337 if (match) {
1338 return true;
1339 }
1340 } break;
1341
1342 case JVM_CONSTANT_UnresolvedClass:
1343 {
1344 Symbol* k1 = klass_name_at(index1);
1345 Symbol* k2 = cp2->klass_name_at(index2);
1346 if (k1 == k2) {
1347 return true;
1348 }
1349 } break;
1350
1351 case JVM_CONSTANT_MethodType:
1352 {
1353 int k1 = method_type_index_at(index1);
1354 int k2 = cp2->method_type_index_at(index2);
1355 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1356 if (match) {
1357 return true;
1358 }
1359 } break;
1360
1361 case JVM_CONSTANT_MethodHandle:
1362 {
1363 int k1 = method_handle_ref_kind_at(index1);
1364 int k2 = cp2->method_handle_ref_kind_at(index2);
1365 if (k1 == k2) {
1366 int i1 = method_handle_index_at(index1);
1367 int i2 = cp2->method_handle_index_at(index2);
1368 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1369 if (match) {
1370 return true;
1371 }
1372 }
1373 } break;
1374
1375 case JVM_CONSTANT_Dynamic:
1376 {
1377 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1378 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1379 int i1 = bootstrap_methods_attribute_index(index1);
1380 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1381 // separate statements and variables because CHECK_false is used
1382 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1383 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1384 return (match_entry && match_operand);
1385 } break;
1386
1387 case JVM_CONSTANT_InvokeDynamic:
1388 {
1389 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1390 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1391 int i1 = bootstrap_methods_attribute_index(index1);
1392 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1393 // separate statements and variables because CHECK_false is used
1394 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1395 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1396 return (match_entry && match_operand);
1397 } break;
1398
1399 case JVM_CONSTANT_String:
1400 {
1401 Symbol* s1 = unresolved_string_at(index1);
1402 Symbol* s2 = cp2->unresolved_string_at(index2);
1403 if (s1 == s2) {
1404 return true;
1405 }
1406 } break;
1407
1408 case JVM_CONSTANT_Utf8:
1409 {
1410 Symbol* s1 = symbol_at(index1);
1411 Symbol* s2 = cp2->symbol_at(index2);
1412 if (s1 == s2) {
1413 return true;
1414 }
1415 } break;
1416
1417 // Invalid is used as the tag for the second constant pool entry
1418 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1419 // not be seen by itself.
1420 case JVM_CONSTANT_Invalid: // fall through
1421
1422 default:
1423 ShouldNotReachHere();
1424 break;
1425 }
1426
1427 return false;
1428 } // end compare_entry_to()
1429
1430
1431 // Resize the operands array with delta_len and delta_size.
1432 // Used in RedefineClasses for CP merge.
1433 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1434 int old_len = operand_array_length(operands());
1435 int new_len = old_len + delta_len;
1436 int min_len = (delta_len > 0) ? old_len : new_len;
1437
1438 int old_size = operands()->length();
1439 int new_size = old_size + delta_size;
1440 int min_size = (delta_size > 0) ? old_size : new_size;
1441
1442 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1443 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1444
1445 // Set index in the resized array for existing elements only
1446 for (int idx = 0; idx < min_len; idx++) {
1447 int offset = operand_offset_at(idx); // offset in original array
1448 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1449 }
1450 // Copy the bootstrap specifiers only
1451 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1452 new_ops->adr_at(2*new_len),
1453 (min_size - 2*min_len) * sizeof(u2));
1454 // Explicitly deallocate old operands array.
1455 // Note, it is not needed for 7u backport.
1456 if ( operands() != NULL) { // the safety check
1457 MetadataFactory::free_array<u2>(loader_data, operands());
1458 }
1459 set_operands(new_ops);
1460 } // end resize_operands()
1461
1462
1463 // Extend the operands array with the length and size of the ext_cp operands.
1464 // Used in RedefineClasses for CP merge.
1465 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1466 int delta_len = operand_array_length(ext_cp->operands());
1467 if (delta_len == 0) {
1468 return; // nothing to do
1469 }
1470 int delta_size = ext_cp->operands()->length();
1471
1472 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1473
1474 if (operand_array_length(operands()) == 0) {
1475 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1476 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1477 // The first element index defines the offset of second part
1478 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1479 set_operands(new_ops);
1480 } else {
1481 resize_operands(delta_len, delta_size, CHECK);
1482 }
1483
1484 } // end extend_operands()
1485
1486
1487 // Shrink the operands array to a smaller array with new_len length.
1488 // Used in RedefineClasses for CP merge.
1489 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1490 int old_len = operand_array_length(operands());
1491 if (new_len == old_len) {
1492 return; // nothing to do
1493 }
1494 assert(new_len < old_len, "shrunken operands array must be smaller");
1495
1496 int free_base = operand_next_offset_at(new_len - 1);
1497 int delta_len = new_len - old_len;
1498 int delta_size = 2*delta_len + free_base - operands()->length();
1499
1500 resize_operands(delta_len, delta_size, CHECK);
1501
1502 } // end shrink_operands()
1503
1504
1505 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1506 const constantPoolHandle& to_cp,
1507 TRAPS) {
1508
1509 int from_oplen = operand_array_length(from_cp->operands());
1510 int old_oplen = operand_array_length(to_cp->operands());
1511 if (from_oplen != 0) {
1512 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1513 // append my operands to the target's operands array
1514 if (old_oplen == 0) {
1515 // Can't just reuse from_cp's operand list because of deallocation issues
1516 int len = from_cp->operands()->length();
1517 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1518 Copy::conjoint_memory_atomic(
1519 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1520 to_cp->set_operands(new_ops);
1521 } else {
1522 int old_len = to_cp->operands()->length();
1523 int from_len = from_cp->operands()->length();
1524 int old_off = old_oplen * sizeof(u2);
1525 int from_off = from_oplen * sizeof(u2);
1526 // Use the metaspace for the destination constant pool
1527 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1528 int fillp = 0, len = 0;
1529 // first part of dest
1530 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1531 new_operands->adr_at(fillp),
1532 (len = old_off) * sizeof(u2));
1533 fillp += len;
1534 // first part of src
1535 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1536 new_operands->adr_at(fillp),
1537 (len = from_off) * sizeof(u2));
1538 fillp += len;
1539 // second part of dest
1540 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1541 new_operands->adr_at(fillp),
1542 (len = old_len - old_off) * sizeof(u2));
1543 fillp += len;
1544 // second part of src
1545 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1546 new_operands->adr_at(fillp),
1547 (len = from_len - from_off) * sizeof(u2));
1548 fillp += len;
1549 assert(fillp == new_operands->length(), "");
1550
1551 // Adjust indexes in the first part of the copied operands array.
1552 for (int j = 0; j < from_oplen; j++) {
1553 int offset = operand_offset_at(new_operands, old_oplen + j);
1554 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1555 offset += old_len; // every new tuple is preceded by old_len extra u2's
1556 operand_offset_at_put(new_operands, old_oplen + j, offset);
1557 }
1558
1559 // replace target operands array with combined array
1560 to_cp->set_operands(new_operands);
1561 }
1562 }
1563 } // end copy_operands()
1564
1565
1566 // Copy this constant pool's entries at start_i to end_i (inclusive)
1567 // to the constant pool to_cp's entries starting at to_i. A total of
1568 // (end_i - start_i) + 1 entries are copied.
1569 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1570 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1571
1572
1573 int dest_i = to_i; // leave original alone for debug purposes
1574
1575 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1576 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1577
1578 switch (from_cp->tag_at(src_i).value()) {
1579 case JVM_CONSTANT_Double:
1580 case JVM_CONSTANT_Long:
1581 // double and long take two constant pool entries
1582 src_i += 2;
1583 dest_i += 2;
1584 break;
1585
1586 default:
1587 // all others take one constant pool entry
1588 src_i++;
1589 dest_i++;
1590 break;
1591 }
1592 }
1593 copy_operands(from_cp, to_cp, CHECK);
1594
1595 } // end copy_cp_to_impl()
1596
1597
1598 // Copy this constant pool's entry at from_i to the constant pool
1599 // to_cp's entry at to_i.
1600 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1601 const constantPoolHandle& to_cp, int to_i,
1602 TRAPS) {
1603
1604 int tag = from_cp->tag_at(from_i).value();
1605 switch (tag) {
1606 case JVM_CONSTANT_ClassIndex:
1607 {
1608 jint ki = from_cp->klass_index_at(from_i);
1609 to_cp->klass_index_at_put(to_i, ki);
1610 } break;
1611
1612 case JVM_CONSTANT_Double:
1613 {
1614 jdouble d = from_cp->double_at(from_i);
1615 to_cp->double_at_put(to_i, d);
1616 // double takes two constant pool entries so init second entry's tag
1617 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1618 } break;
1619
1620 case JVM_CONSTANT_Fieldref:
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->field_at_put(to_i, class_index, name_and_type_index);
1625 } break;
1626
1627 case JVM_CONSTANT_Float:
1628 {
1629 jfloat f = from_cp->float_at(from_i);
1630 to_cp->float_at_put(to_i, f);
1631 } break;
1632
1633 case JVM_CONSTANT_Integer:
1634 {
1635 jint i = from_cp->int_at(from_i);
1636 to_cp->int_at_put(to_i, i);
1637 } break;
1638
1639 case JVM_CONSTANT_InterfaceMethodref:
1640 {
1641 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1642 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1643 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1644 } break;
1645
1646 case JVM_CONSTANT_Long:
1647 {
1648 jlong l = from_cp->long_at(from_i);
1649 to_cp->long_at_put(to_i, l);
1650 // long takes two constant pool entries so init second entry's tag
1651 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1652 } break;
1653
1654 case JVM_CONSTANT_Methodref:
1655 {
1656 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1657 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1658 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1659 } break;
1660
1661 case JVM_CONSTANT_NameAndType:
1662 {
1663 int name_ref_index = from_cp->name_ref_index_at(from_i);
1664 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1665 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1666 } break;
1667
1668 case JVM_CONSTANT_StringIndex:
1669 {
1670 jint si = from_cp->string_index_at(from_i);
1671 to_cp->string_index_at_put(to_i, si);
1672 } break;
1673
1674 case JVM_CONSTANT_Class:
1675 case JVM_CONSTANT_UnresolvedClass:
1676 case JVM_CONSTANT_UnresolvedClassInError:
1677 {
1678 // Revert to JVM_CONSTANT_ClassIndex
1679 int name_index = from_cp->klass_slot_at(from_i).name_index();
1680 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1681 to_cp->klass_index_at_put(to_i, name_index);
1682 } break;
1683
1684 case JVM_CONSTANT_String:
1685 {
1686 Symbol* s = from_cp->unresolved_string_at(from_i);
1687 to_cp->unresolved_string_at_put(to_i, s);
1688 } break;
1689
1690 case JVM_CONSTANT_Utf8:
1691 {
1692 Symbol* s = from_cp->symbol_at(from_i);
1693 // Need to increase refcount, the old one will be thrown away and deferenced
1694 s->increment_refcount();
1695 to_cp->symbol_at_put(to_i, s);
1696 } break;
1697
1698 case JVM_CONSTANT_MethodType:
1699 case JVM_CONSTANT_MethodTypeInError:
1700 {
1701 jint k = from_cp->method_type_index_at(from_i);
1702 to_cp->method_type_index_at_put(to_i, k);
1703 } break;
1704
1705 case JVM_CONSTANT_MethodHandle:
1706 case JVM_CONSTANT_MethodHandleInError:
1707 {
1708 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1709 int k2 = from_cp->method_handle_index_at(from_i);
1710 to_cp->method_handle_index_at_put(to_i, k1, k2);
1711 } break;
1712
1713 case JVM_CONSTANT_Dynamic:
1714 case JVM_CONSTANT_DynamicInError:
1715 {
1716 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1717 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1718 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1719 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1720 } break;
1721
1722 case JVM_CONSTANT_InvokeDynamic:
1723 {
1724 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1725 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1726 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1727 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1728 } break;
1729
1730 // Invalid is used as the tag for the second constant pool entry
1731 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1732 // not be seen by itself.
1733 case JVM_CONSTANT_Invalid: // fall through
1734
1735 default:
1736 {
1737 ShouldNotReachHere();
1738 } break;
1739 }
1740 } // end copy_entry_to()
1741
1742 // Search constant pool search_cp for an entry that matches this
1743 // constant pool's entry at pattern_i. Returns the index of a
1744 // matching entry or zero (0) if there is no matching entry.
1745 int ConstantPool::find_matching_entry(int pattern_i,
1746 const constantPoolHandle& search_cp, TRAPS) {
1747
1748 // index zero (0) is not used
1749 for (int i = 1; i < search_cp->length(); i++) {
1750 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1751 if (found) {
1752 return i;
1753 }
1754 }
1755
1756 return 0; // entry not found; return unused index zero (0)
1757 } // end find_matching_entry()
1758
1759
1760 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1761 // cp2's bootstrap specifier at idx2.
1762 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1763 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1764 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1765 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1766
1767 if (!match) {
1768 return false;
1769 }
1770 int argc = operand_argument_count_at(idx1);
1771 if (argc == cp2->operand_argument_count_at(idx2)) {
1772 for (int j = 0; j < argc; j++) {
1773 k1 = operand_argument_index_at(idx1, j);
1774 k2 = cp2->operand_argument_index_at(idx2, j);
1775 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1776 if (!match) {
1777 return false;
1778 }
1779 }
1780 return true; // got through loop; all elements equal
1781 }
1782 return false;
1783 } // end compare_operand_to()
1784
1785 // Search constant pool search_cp for a bootstrap specifier that matches
1786 // this constant pool's bootstrap specifier data at pattern_i index.
1787 // Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1788 int ConstantPool::find_matching_operand(int pattern_i,
1789 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1790 for (int i = 0; i < search_len; i++) {
1791 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1792 if (found) {
1793 return i;
1794 }
1795 }
1796 return -1; // bootstrap specifier data not found; return unused index (-1)
1797 } // end find_matching_operand()
1798
1799
1800 #ifndef PRODUCT
1801
1802 const char* ConstantPool::printable_name_at(int which) {
1803
1804 constantTag tag = tag_at(which);
1805
1806 if (tag.is_string()) {
1807 return string_at_noresolve(which);
1808 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1809 return klass_name_at(which)->as_C_string();
1810 } else if (tag.is_symbol()) {
1811 return symbol_at(which)->as_C_string();
1812 }
1813 return "";
1814 }
1815
1816 #endif // PRODUCT
1817
1818
1819 // JVMTI GetConstantPool support
1820
1821 // For debugging of constant pool
1822 const bool debug_cpool = false;
1823
1824 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1825
1826 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1827 const char* WARN_MSG = "Must not be such entry!";
1828 jint size = 0;
1829 u2 idx1, idx2;
1830
1831 for (jint idx = 1; idx < cnt; idx++) {
1832 jint ent_size = 0;
1833 u1 tag = *bytes++;
1834 size++; // count tag
1835
1836 printf("const #%03d, tag: %02d ", idx, tag);
1837 switch(tag) {
1838 case JVM_CONSTANT_Invalid: {
1839 printf("Invalid");
1840 break;
1841 }
1842 case JVM_CONSTANT_Unicode: {
1843 printf("Unicode %s", WARN_MSG);
1844 break;
1845 }
1846 case JVM_CONSTANT_Utf8: {
1847 u2 len = Bytes::get_Java_u2(bytes);
1848 char str[128];
1849 if (len > 127) {
1850 len = 127;
1851 }
1852 strncpy(str, (char *) (bytes+2), len);
1853 str[len] = '\0';
1854 printf("Utf8 \"%s\"", str);
1855 ent_size = 2 + len;
1856 break;
1857 }
1858 case JVM_CONSTANT_Integer: {
1859 u4 val = Bytes::get_Java_u4(bytes);
1860 printf("int %d", *(int *) &val);
1861 ent_size = 4;
1862 break;
1863 }
1864 case JVM_CONSTANT_Float: {
1865 u4 val = Bytes::get_Java_u4(bytes);
1866 printf("float %5.3ff", *(float *) &val);
1867 ent_size = 4;
1868 break;
1869 }
1870 case JVM_CONSTANT_Long: {
1871 u8 val = Bytes::get_Java_u8(bytes);
1872 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1873 ent_size = 8;
1874 idx++; // Long takes two cpool slots
1875 break;
1876 }
1877 case JVM_CONSTANT_Double: {
1878 u8 val = Bytes::get_Java_u8(bytes);
1879 printf("double %5.3fd", *(jdouble *)&val);
1880 ent_size = 8;
1881 idx++; // Double takes two cpool slots
1882 break;
1883 }
1884 case JVM_CONSTANT_Class: {
1885 idx1 = Bytes::get_Java_u2(bytes);
1886 printf("class #%03d", idx1);
1887 ent_size = 2;
1888 break;
1889 }
1890 case (JVM_CONSTANT_Class | JVM_CONSTANT_QDescBit): {
1891 idx1 = Bytes::get_Java_u2(bytes);
1892 printf("qclass #%03d", idx1);
1893 ent_size = 2;
1894 break;
1895 }
1896 case JVM_CONSTANT_String: {
1897 idx1 = Bytes::get_Java_u2(bytes);
1898 printf("String #%03d", idx1);
1899 ent_size = 2;
1900 break;
1901 }
1902 case JVM_CONSTANT_Fieldref: {
1903 idx1 = Bytes::get_Java_u2(bytes);
1904 idx2 = Bytes::get_Java_u2(bytes+2);
1905 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1906 ent_size = 4;
1907 break;
1908 }
1909 case JVM_CONSTANT_Methodref: {
1910 idx1 = Bytes::get_Java_u2(bytes);
1911 idx2 = Bytes::get_Java_u2(bytes+2);
1912 printf("Method #%03d, #%03d", idx1, idx2);
1913 ent_size = 4;
1914 break;
1915 }
1916 case JVM_CONSTANT_InterfaceMethodref: {
1917 idx1 = Bytes::get_Java_u2(bytes);
1918 idx2 = Bytes::get_Java_u2(bytes+2);
1919 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1920 ent_size = 4;
1921 break;
1922 }
1923 case JVM_CONSTANT_NameAndType: {
1924 idx1 = Bytes::get_Java_u2(bytes);
1925 idx2 = Bytes::get_Java_u2(bytes+2);
1926 printf("NameAndType #%03d, #%03d", idx1, idx2);
1927 ent_size = 4;
1928 break;
1929 }
1930 case JVM_CONSTANT_ClassIndex: {
1931 printf("ClassIndex %s", WARN_MSG);
1932 break;
1933 }
1934 case JVM_CONSTANT_UnresolvedClass: {
1935 printf("UnresolvedClass: %s", WARN_MSG);
1936 break;
1937 }
1938 case (JVM_CONSTANT_UnresolvedClass | JVM_CONSTANT_QDescBit): {
1939 printf("UnresolvedQClass: %s", WARN_MSG);
1940 break;
1941 }
1942 case JVM_CONSTANT_UnresolvedClassInError: {
1943 printf("UnresolvedClassInErr: %s", WARN_MSG);
1944 break;
1945 }
1946 case JVM_CONSTANT_StringIndex: {
1947 printf("StringIndex: %s", WARN_MSG);
1948 break;
1949 }
1950 }
1951 printf(";\n");
1952 bytes += ent_size;
1953 size += ent_size;
1954 }
1955 printf("Cpool size: %d\n", size);
1956 fflush(0);
1957 return;
1958 } /* end print_cpool_bytes */
1959
1960
1961 // Returns size of constant pool entry.
1962 jint ConstantPool::cpool_entry_size(jint idx) {
1963 switch(tag_at(idx).value()) {
1964 case JVM_CONSTANT_Invalid:
1965 case JVM_CONSTANT_Unicode:
1966 return 1;
1967
1968 case JVM_CONSTANT_Utf8:
1969 return 3 + symbol_at(idx)->utf8_length();
1970
1971 case JVM_CONSTANT_Class:
1972 case JVM_CONSTANT_String:
1973 case JVM_CONSTANT_ClassIndex:
1974 case JVM_CONSTANT_UnresolvedClass:
1975 case JVM_CONSTANT_UnresolvedClassInError:
1976 case JVM_CONSTANT_StringIndex:
1977 case JVM_CONSTANT_MethodType:
1978 case JVM_CONSTANT_MethodTypeInError:
1979 return 3;
1980
1981 case JVM_CONSTANT_MethodHandle:
1982 case JVM_CONSTANT_MethodHandleInError:
1983 return 4; //tag, ref_kind, ref_index
1984
1985 case JVM_CONSTANT_Integer:
1986 case JVM_CONSTANT_Float:
1987 case JVM_CONSTANT_Fieldref:
1988 case JVM_CONSTANT_Methodref:
1989 case JVM_CONSTANT_InterfaceMethodref:
1990 case JVM_CONSTANT_NameAndType:
1991 return 5;
1992
1993 case JVM_CONSTANT_Dynamic:
1994 case JVM_CONSTANT_DynamicInError:
1995 case JVM_CONSTANT_InvokeDynamic:
1996 // u1 tag, u2 bsm, u2 nt
1997 return 5;
1998
1999 case JVM_CONSTANT_Long:
2000 case JVM_CONSTANT_Double:
2001 return 9;
2002 }
2003 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
2004 return 1;
2005 } /* end cpool_entry_size */
2006
2007
2008 // SymbolHashMap is used to find a constant pool index from a string.
2009 // This function fills in SymbolHashMaps, one for utf8s and one for
2010 // class names, returns size of the cpool raw bytes.
2011 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
2012 SymbolHashMap *classmap) {
2013 jint size = 0;
2014
2015 for (u2 idx = 1; idx < length(); idx++) {
2016 u2 tag = tag_at(idx).value();
2017 size += cpool_entry_size(idx);
2018
2019 switch(tag) {
2020 case JVM_CONSTANT_Utf8: {
2021 Symbol* sym = symbol_at(idx);
2022 symmap->add_entry(sym, idx);
2023 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
2024 break;
2025 }
2026 case JVM_CONSTANT_Class:
2027 case JVM_CONSTANT_UnresolvedClass:
2028 case JVM_CONSTANT_UnresolvedClassInError: {
2029 Symbol* sym = klass_name_at(idx);
2030 classmap->add_entry(sym, idx);
2031 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
2032 break;
2033 }
2034 case JVM_CONSTANT_Long:
2035 case JVM_CONSTANT_Double: {
2036 idx++; // Both Long and Double take two cpool slots
2037 break;
2038 }
2039 }
2040 }
2041 return size;
2042 } /* end hash_utf8_entries_to */
2043
2044
2045 // Copy cpool bytes.
2046 // Returns:
2047 // 0, in case of OutOfMemoryError
2048 // -1, in case of internal error
2049 // > 0, count of the raw cpool bytes that have been copied
2050 int ConstantPool::copy_cpool_bytes(int cpool_size,
2051 SymbolHashMap* tbl,
2052 unsigned char *bytes) {
2053 u2 idx1, idx2;
2054 jint size = 0;
2055 jint cnt = length();
2056 unsigned char *start_bytes = bytes;
2057
2058 for (jint idx = 1; idx < cnt; idx++) {
2059 u1 tag = tag_at(idx).value();
2060 jint ent_size = cpool_entry_size(idx);
2061
2062 assert(size + ent_size <= cpool_size, "Size mismatch");
2063
2064 *bytes = tag;
2065 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2066 switch(tag) {
2067 case JVM_CONSTANT_Invalid: {
2068 DBG(printf("JVM_CONSTANT_Invalid"));
2069 break;
2070 }
2071 case JVM_CONSTANT_Unicode: {
2072 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2073 DBG(printf("JVM_CONSTANT_Unicode"));
2074 break;
2075 }
2076 case JVM_CONSTANT_Utf8: {
2077 Symbol* sym = symbol_at(idx);
2078 char* str = sym->as_utf8();
2079 // Warning! It's crashing on x86 with len = sym->utf8_length()
2080 int len = (int) strlen(str);
2081 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2082 for (int i = 0; i < len; i++) {
2083 bytes[3+i] = (u1) str[i];
2084 }
2085 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2086 break;
2087 }
2088 case JVM_CONSTANT_Integer: {
2089 jint val = int_at(idx);
2090 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2091 break;
2092 }
2093 case JVM_CONSTANT_Float: {
2094 jfloat val = float_at(idx);
2095 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2096 break;
2097 }
2098 case JVM_CONSTANT_Long: {
2099 jlong val = long_at(idx);
2100 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2101 idx++; // Long takes two cpool slots
2102 break;
2103 }
2104 case JVM_CONSTANT_Double: {
2105 jdouble val = double_at(idx);
2106 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2107 idx++; // Double takes two cpool slots
2108 break;
2109 }
2110 case JVM_CONSTANT_Class:
2111 case JVM_CONSTANT_UnresolvedClass:
2112 case JVM_CONSTANT_UnresolvedClassInError: {
2113 assert(!tag_at(idx).is_Qdescriptor_klass(), "Failed to encode QDesc");
2114 *bytes = JVM_CONSTANT_Class;
2115 Symbol* sym = klass_name_at(idx);
2116 idx1 = tbl->symbol_to_value(sym);
2117 assert(idx1 != 0, "Have not found a hashtable entry");
2118 Bytes::put_Java_u2((address) (bytes+1), idx1);
2119 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2120 break;
2121 }
2122 case JVM_CONSTANT_String: {
2123 *bytes = JVM_CONSTANT_String;
2124 Symbol* sym = unresolved_string_at(idx);
2125 idx1 = tbl->symbol_to_value(sym);
2126 assert(idx1 != 0, "Have not found a hashtable entry");
2127 Bytes::put_Java_u2((address) (bytes+1), idx1);
2128 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2129 break;
2130 }
2131 case JVM_CONSTANT_Fieldref:
2132 case JVM_CONSTANT_Methodref:
2133 case JVM_CONSTANT_InterfaceMethodref: {
2134 idx1 = uncached_klass_ref_index_at(idx);
2135 idx2 = uncached_name_and_type_ref_index_at(idx);
2136 Bytes::put_Java_u2((address) (bytes+1), idx1);
2137 Bytes::put_Java_u2((address) (bytes+3), idx2);
2138 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2139 break;
2140 }
2141 case JVM_CONSTANT_NameAndType: {
2142 idx1 = name_ref_index_at(idx);
2143 idx2 = signature_ref_index_at(idx);
2144 Bytes::put_Java_u2((address) (bytes+1), idx1);
2145 Bytes::put_Java_u2((address) (bytes+3), idx2);
2146 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2147 break;
2148 }
2149 case JVM_CONSTANT_ClassIndex: {
2150 *bytes = JVM_CONSTANT_Class;
2151 idx1 = klass_index_at(idx);
2152 Bytes::put_Java_u2((address) (bytes+1), idx1);
2153 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2154 break;
2155 }
2156 case JVM_CONSTANT_StringIndex: {
2157 *bytes = JVM_CONSTANT_String;
2158 idx1 = string_index_at(idx);
2159 Bytes::put_Java_u2((address) (bytes+1), idx1);
2160 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2161 break;
2162 }
2163 case JVM_CONSTANT_MethodHandle:
2164 case JVM_CONSTANT_MethodHandleInError: {
2165 *bytes = JVM_CONSTANT_MethodHandle;
2166 int kind = method_handle_ref_kind_at(idx);
2167 idx1 = method_handle_index_at(idx);
2168 *(bytes+1) = (unsigned char) kind;
2169 Bytes::put_Java_u2((address) (bytes+2), idx1);
2170 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2171 break;
2172 }
2173 case JVM_CONSTANT_MethodType:
2174 case JVM_CONSTANT_MethodTypeInError: {
2175 *bytes = JVM_CONSTANT_MethodType;
2176 idx1 = method_type_index_at(idx);
2177 Bytes::put_Java_u2((address) (bytes+1), idx1);
2178 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2179 break;
2180 }
2181 case JVM_CONSTANT_Dynamic:
2182 case JVM_CONSTANT_DynamicInError: {
2183 *bytes = tag;
2184 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2185 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2186 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2187 Bytes::put_Java_u2((address) (bytes+1), idx1);
2188 Bytes::put_Java_u2((address) (bytes+3), idx2);
2189 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2190 break;
2191 }
2192 case JVM_CONSTANT_InvokeDynamic: {
2193 *bytes = tag;
2194 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2195 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2196 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2197 Bytes::put_Java_u2((address) (bytes+1), idx1);
2198 Bytes::put_Java_u2((address) (bytes+3), idx2);
2199 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2200 break;
2201 }
2202 }
2203 DBG(printf("\n"));
2204 bytes += ent_size;
2205 size += ent_size;
2206 }
2207 assert(size == cpool_size, "Size mismatch");
2208
2209 // Keep temorarily for debugging until it's stable.
2210 DBG(print_cpool_bytes(cnt, start_bytes));
2211 return (int)(bytes - start_bytes);
2212 } /* end copy_cpool_bytes */
2213
2214 #undef DBG
2215
2216
2217 void ConstantPool::set_on_stack(const bool value) {
2218 if (value) {
2219 // Only record if it's not already set.
2220 if (!on_stack()) {
2221 assert(!is_shared(), "should always be set for shared constant pools");
2222 _flags |= _on_stack;
2223 MetadataOnStackMark::record(this);
2224 }
2225 } else {
2226 // Clearing is done single-threadedly.
2227 if (!is_shared()) {
2228 _flags &= ~_on_stack;
2229 }
2230 }
2231 }
2232
2233 // JSR 292 support for patching constant pool oops after the class is linked and
2234 // the oop array for resolved references are created.
2235 // We can't do this during classfile parsing, which is how the other indexes are
2236 // patched. The other patches are applied early for some error checking
2237 // so only defer the pseudo_strings.
2238 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
2239 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
2240 Handle patch = cp_patches->at(index);
2241 if (patch.not_null()) {
2242 assert (tag_at(index).is_string(), "should only be string left");
2243 // Patching a string means pre-resolving it.
2244 // The spelling in the constant pool is ignored.
2245 // The constant reference may be any object whatever.
2246 // If it is not a real interned string, the constant is referred
2247 // to as a "pseudo-string", and must be presented to the CP
2248 // explicitly, because it may require scavenging.
2249 int obj_index = cp_to_object_index(index);
2250 pseudo_string_at_put(index, obj_index, patch());
2251 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
2252 }
2253 }
2254 #ifdef ASSERT
2255 // Ensure that all the patches have been used.
2256 for (int index = 0; index < cp_patches->length(); index++) {
2257 assert(cp_patches->at(index).is_null(),
2258 "Unused constant pool patch at %d in class file %s",
2259 index,
2260 pool_holder()->external_name());
2261 }
2262 #endif // ASSERT
2263 }
2264
2265 // Printing
2266
2267 void ConstantPool::print_on(outputStream* st) const {
2268 assert(is_constantPool(), "must be constantPool");
2269 st->print_cr("%s", internal_name());
2270 if (flags() != 0) {
2271 st->print(" - flags: 0x%x", flags());
2272 if (has_preresolution()) st->print(" has_preresolution");
2273 if (on_stack()) st->print(" on_stack");
2274 st->cr();
2275 }
2276 if (pool_holder() != NULL) {
2277 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
2278 }
2279 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
2280 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
2281 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
2282 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
2283
2284 for (int index = 1; index < length(); index++) { // Index 0 is unused
2285 ((ConstantPool*)this)->print_entry_on(index, st);
2286 switch (tag_at(index).value()) {
2287 case JVM_CONSTANT_Long :
2288 case JVM_CONSTANT_Double :
2289 index++; // Skip entry following eigth-byte constant
2290 }
2291
2292 }
2293 st->cr();
2294 }
2295
2296 // Print one constant pool entry
2297 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2298 EXCEPTION_MARK;
2299 st->print(" - %3d : ", index);
2300 tag_at(index).print_on(st);
2301 st->print(" : ");
2302 switch (tag_at(index).value()) {
2303 case JVM_CONSTANT_Class :
2304 { Klass* k = klass_at(index, CATCH);
2305 guarantee(k != NULL, "need klass");
2306 k->print_value_on(st);
2307 st->print(" {" PTR_FORMAT "}", p2i(k));
2308 }
2309 break;
2310 case JVM_CONSTANT_Fieldref :
2311 case JVM_CONSTANT_Methodref :
2312 case JVM_CONSTANT_InterfaceMethodref :
2313 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2314 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2315 break;
2316 case JVM_CONSTANT_String :
2317 if (is_pseudo_string_at(index)) {
2318 oop anObj = pseudo_string_at(index);
2319 anObj->print_value_on(st);
2320 st->print(" {" PTR_FORMAT "}", p2i(anObj));
2321 } else {
2322 unresolved_string_at(index)->print_value_on(st);
2323 }
2324 break;
2325 case JVM_CONSTANT_Integer :
2326 st->print("%d", int_at(index));
2327 break;
2328 case JVM_CONSTANT_Float :
2329 st->print("%f", float_at(index));
2330 break;
2331 case JVM_CONSTANT_Long :
2332 st->print_jlong(long_at(index));
2333 break;
2334 case JVM_CONSTANT_Double :
2335 st->print("%lf", double_at(index));
2336 break;
2337 case JVM_CONSTANT_NameAndType :
2338 st->print("name_index=%d", name_ref_index_at(index));
2339 st->print(" signature_index=%d", signature_ref_index_at(index));
2340 break;
2341 case JVM_CONSTANT_Utf8 :
2342 symbol_at(index)->print_value_on(st);
2343 break;
2344 case JVM_CONSTANT_ClassIndex: {
2345 int name_index = *int_at_addr(index);
2346 st->print("klass_index=%d ", name_index);
2347 symbol_at(name_index)->print_value_on(st);
2348 }
2349 break;
2350 case JVM_CONSTANT_UnresolvedClass : // fall-through
2351 case JVM_CONSTANT_UnresolvedClassInError: {
2352 CPKlassSlot kslot = klass_slot_at(index);
2353 int resolved_klass_index = kslot.resolved_klass_index();
2354 int name_index = kslot.name_index();
2355 assert(tag_at(name_index).is_symbol(), "sanity");
2356
2357 Klass* klass = resolved_klasses()->at(resolved_klass_index);
2358 if (klass != NULL) {
2359 klass->print_value_on(st);
2360 } else {
2361 symbol_at(name_index)->print_value_on(st);
2362 }
2363 }
2364 break;
2365 case JVM_CONSTANT_MethodHandle :
2366 case JVM_CONSTANT_MethodHandleInError :
2367 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2368 st->print(" ref_index=%d", method_handle_index_at(index));
2369 break;
2370 case JVM_CONSTANT_MethodType :
2371 case JVM_CONSTANT_MethodTypeInError :
2372 st->print("signature_index=%d", method_type_index_at(index));
2373 break;
2374 case JVM_CONSTANT_Dynamic :
2375 case JVM_CONSTANT_DynamicInError :
2376 {
2377 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2378 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2379 int argc = bootstrap_argument_count_at(index);
2380 if (argc > 0) {
2381 for (int arg_i = 0; arg_i < argc; arg_i++) {
2382 int arg = bootstrap_argument_index_at(index, arg_i);
2383 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2384 }
2385 st->print("}");
2386 }
2387 }
2388 break;
2389 case JVM_CONSTANT_InvokeDynamic :
2390 {
2391 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2392 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2393 int argc = bootstrap_argument_count_at(index);
2394 if (argc > 0) {
2395 for (int arg_i = 0; arg_i < argc; arg_i++) {
2396 int arg = bootstrap_argument_index_at(index, arg_i);
2397 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2398 }
2399 st->print("}");
2400 }
2401 }
2402 break;
2403 default:
2404 ShouldNotReachHere();
2405 break;
2406 }
2407 st->cr();
2408 }
2409
2410 void ConstantPool::print_value_on(outputStream* st) const {
2411 assert(is_constantPool(), "must be constantPool");
2412 st->print("constant pool [%d]", length());
2413 if (has_preresolution()) st->print("/preresolution");
2414 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2415 print_address_on(st);
2416 if (pool_holder() != NULL) {
2417 st->print(" for ");
2418 pool_holder()->print_value_on(st);
2419 bool extra = (pool_holder()->constants() != this);
2420 if (extra) st->print(" (extra)");
2421 }
2422 if (cache() != NULL) {
2423 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2424 }
2425 }
2426
2427 // Verification
2428
2429 void ConstantPool::verify_on(outputStream* st) {
2430 guarantee(is_constantPool(), "object must be constant pool");
2431 for (int i = 0; i< length(); i++) {
2432 constantTag tag = tag_at(i);
2433 if (tag.is_klass() || tag.is_unresolved_klass()) {
2434 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2435 } else if (tag.is_symbol()) {
2436 CPSlot entry = slot_at(i);
2437 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2438 } else if (tag.is_string()) {
2439 CPSlot entry = slot_at(i);
2440 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2441 }
2442 }
2443 if (pool_holder() != NULL) {
2444 // Note: pool_holder() can be NULL in temporary constant pools
2445 // used during constant pool merging
2446 guarantee(pool_holder()->is_klass(), "should be klass");
2447 }
2448 }
2449
2450
2451 SymbolHashMap::~SymbolHashMap() {
2452 SymbolHashMapEntry* next;
2453 for (int i = 0; i < _table_size; i++) {
2454 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
2455 next = cur->next();
2456 delete(cur);
2457 }
2458 }
2459 FREE_C_HEAP_ARRAY(SymbolHashMapBucket, _buckets);
2460 }
2461
2462 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2463 char *str = sym->as_utf8();
2464 unsigned int hash = compute_hash(str, sym->utf8_length());
2465 unsigned int index = hash % table_size();
2466
2467 // check if already in map
2468 // we prefer the first entry since it is more likely to be what was used in
2469 // the class file
2470 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2471 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2472 if (en->hash() == hash && en->symbol() == sym) {
2473 return; // already there
2474 }
2475 }
2476
2477 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2478 entry->set_next(bucket(index));
2479 _buckets[index].set_entry(entry);
2480 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2481 }
2482
2483 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2484 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2485 char *str = sym->as_utf8();
2486 int len = sym->utf8_length();
2487 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2488 unsigned int index = hash % table_size();
2489 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2490 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2491 if (en->hash() == hash && en->symbol() == sym) {
2492 return en;
2493 }
2494 }
2495 return NULL;
2496 }
2497
2498 void SymbolHashMap::initialize_table(int table_size) {
2499 _table_size = table_size;
2500 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
2501 for (int index = 0; index < table_size; index++) {
2502 _buckets[index].clear();
2503 }
2504 }