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 bool had_envelope = false;
500 if (name->is_Q_signature()) {
501 name = name->fundamental_name(THREAD);
502 value_type_signature = true;
503 had_envelope = true;
504 } else if (name->is_L_signature()) {
505 name = name->fundamental_name(THREAD);
506 had_envelope = true;
507 }
508 Handle loader (THREAD, this_cp->pool_holder()->class_loader());
509 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain());
510
511 Klass* k;
512 {
513 // Turn off the single stepping while doing class resolution
514 JvmtiHideSingleStepping jhss(javaThread);
515 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD);
516 } // JvmtiHideSingleStepping jhss(javaThread);
517 if (had_envelope) {
518 name->decrement_refcount();
519 }
520
521 if (!HAS_PENDING_EXCEPTION) {
522 // preserve the resolved klass from unloading
523 mirror_handle = Handle(THREAD, k->java_mirror());
524 // Do access check for klasses
525 verify_constant_pool_resolve(this_cp, k, THREAD);
526 }
527
528 if (!HAS_PENDING_EXCEPTION && value_type_signature) {
529 check_is_value_type(k, THREAD);
530 }
531
532 if (!HAS_PENDING_EXCEPTION) {
533 Klass* bottom_klass = NULL;
534 if (k->is_objArray_klass()) {
535 bottom_klass = ObjArrayKlass::cast(k)->bottom_klass();
536 assert(bottom_klass != NULL, "Should be set");
537 assert(bottom_klass->is_instance_klass() || bottom_klass->is_typeArray_klass(), "Sanity check");
538 } else if (k->is_valueArray_klass()) {
539 bottom_klass = ValueArrayKlass::cast(k)->element_klass();
540 assert(bottom_klass != NULL, "Should be set");
541 }
542 }
543
544 // Failed to resolve class. We must record the errors so that subsequent attempts
545 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
546 if (HAS_PENDING_EXCEPTION) {
547 if (save_resolution_error) {
548 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL);
549 // If CHECK_NULL above doesn't return the exception, that means that
550 // some other thread has beaten us and has resolved the class.
551 // To preserve old behavior, we return the resolved class.
552 klass = this_cp->resolved_klasses()->at(resolved_klass_index);
553 assert(klass != NULL, "must be resolved if exception was cleared");
554 return klass;
555 } else {
556 return NULL; // return the pending exception
557 }
558 }
559
560 // logging for class+resolve.
561 if (log_is_enabled(Debug, class, resolve)){
562 trace_class_resolution(this_cp, k);
563 }
564 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index);
565 Atomic::release_store(adr, k);
566 // The interpreter assumes when the tag is stored, the klass is resolved
567 // and the Klass* stored in _resolved_klasses is non-NULL, so we need
568 // hardware store ordering here.
569 jbyte tag = JVM_CONSTANT_Class;
570 if (this_cp->tag_at(which).is_Qdescriptor_klass()) {
571 tag |= JVM_CONSTANT_QDescBit;
572 }
573 this_cp->release_tag_at_put(which, tag);
574 return k;
575 }
576
577
578 // Does not update ConstantPool* - to avoid any exception throwing. Used
579 // by compiler and exception handling. Also used to avoid classloads for
580 // instanceof operations. Returns NULL if the class has not been loaded or
581 // if the verification of constant pool failed
582 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) {
583 CPKlassSlot kslot = this_cp->klass_slot_at(which);
584 int resolved_klass_index = kslot.resolved_klass_index();
585 int name_index = kslot.name_index();
586 assert(this_cp->tag_at(name_index).is_symbol(), "sanity");
587
588 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index);
589 if (k != NULL) {
590 return k;
591 } else {
592 Thread *thread = Thread::current();
593 Symbol* name = this_cp->symbol_at(name_index);
594 oop loader = this_cp->pool_holder()->class_loader();
595 oop protection_domain = this_cp->pool_holder()->protection_domain();
596 Handle h_prot (thread, protection_domain);
597 Handle h_loader (thread, loader);
598 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
599
600 // Avoid constant pool verification at a safepoint, which takes the Module_lock.
601 if (k != NULL && !SafepointSynchronize::is_at_safepoint()) {
602 // Make sure that resolving is legal
603 EXCEPTION_MARK;
604 // return NULL if verification fails
605 verify_constant_pool_resolve(this_cp, k, THREAD);
606 if (HAS_PENDING_EXCEPTION) {
607 CLEAR_PENDING_EXCEPTION;
608 return NULL;
609 }
610 return k;
611 } else {
612 return k;
613 }
614 }
615 }
616
617 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool,
618 int which) {
619 if (cpool->cache() == NULL) return NULL; // nothing to load yet
620 int cache_index = decode_cpcache_index(which, true);
621 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
622 // FIXME: should be an assert
623 log_debug(class, resolve)("bad operand %d in:", which); cpool->print();
624 return NULL;
625 }
626 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
627 return e->method_if_resolved(cpool);
628 }
629
630
631 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
632 if (cpool->cache() == NULL) return false; // nothing to load yet
633 int cache_index = decode_cpcache_index(which, true);
634 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
635 return e->has_appendix();
636 }
637
638 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) {
639 if (cpool->cache() == NULL) return NULL; // nothing to load yet
640 int cache_index = decode_cpcache_index(which, true);
641 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
642 return e->appendix_if_resolved(cpool);
643 }
644
645
646 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) {
647 if (cpool->cache() == NULL) return false; // nothing to load yet
648 int cache_index = decode_cpcache_index(which, true);
649 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
650 return e->has_local_signature();
651 }
652
653 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
654 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
655 return symbol_at(name_index);
656 }
657
658
659 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
660 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
661 return symbol_at(signature_index);
662 }
663
664 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
665 int i = which;
666 if (!uncached && cache() != NULL) {
667 if (ConstantPool::is_invokedynamic_index(which)) {
668 // Invokedynamic index is index into the constant pool cache
669 int pool_index = invokedynamic_bootstrap_ref_index_at(which);
670 pool_index = bootstrap_name_and_type_ref_index_at(pool_index);
671 assert(tag_at(pool_index).is_name_and_type(), "");
672 return pool_index;
673 }
674 // change byte-ordering and go via cache
675 i = remap_instruction_operand_from_cache(which);
676 } else {
677 if (tag_at(which).has_bootstrap()) {
678 int pool_index = bootstrap_name_and_type_ref_index_at(which);
679 assert(tag_at(pool_index).is_name_and_type(), "");
680 return pool_index;
681 }
682 }
683 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
684 assert(!tag_at(i).has_bootstrap(), "Must be handled above");
685 jint ref_index = *int_at_addr(i);
686 return extract_high_short_from_int(ref_index);
687 }
688
689 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) {
690 int pool_index = which;
691 if (!uncached && cache() != NULL) {
692 if (ConstantPool::is_invokedynamic_index(which)) {
693 // Invokedynamic index is index into resolved_references
694 pool_index = invokedynamic_bootstrap_ref_index_at(which);
695 } else {
696 // change byte-ordering and go via cache
697 pool_index = remap_instruction_operand_from_cache(which);
698 }
699 }
700 return tag_at(pool_index);
701 }
702
703 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
704 guarantee(!ConstantPool::is_invokedynamic_index(which),
705 "an invokedynamic instruction does not have a klass");
706 int i = which;
707 if (!uncached && cache() != NULL) {
708 // change byte-ordering and go via cache
709 i = remap_instruction_operand_from_cache(which);
710 }
711 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
712 jint ref_index = *int_at_addr(i);
713 return extract_low_short_from_int(ref_index);
714 }
715
716
717
718 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
719 int cpc_index = operand;
720 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
721 assert((int)(u2)cpc_index == cpc_index, "clean u2");
722 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
723 return member_index;
724 }
725
726
727 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) {
728 if (!(k->is_instance_klass() || k->is_objArray_klass())) {
729 return; // short cut, typeArray klass is always accessible
730 }
731 Klass* holder = this_cp->pool_holder();
732 LinkResolver::check_klass_accessibility(holder, k, CHECK);
733 }
734
735
736 int ConstantPool::name_ref_index_at(int which_nt) {
737 jint ref_index = name_and_type_at(which_nt);
738 return extract_low_short_from_int(ref_index);
739 }
740
741
742 int ConstantPool::signature_ref_index_at(int which_nt) {
743 jint ref_index = name_and_type_at(which_nt);
744 return extract_high_short_from_int(ref_index);
745 }
746
747
748 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
749 return klass_at(klass_ref_index_at(which), THREAD);
750 }
751
752 Symbol* ConstantPool::klass_name_at(int which) const {
753 return symbol_at(klass_slot_at(which).name_index());
754 }
755
756 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
757 jint ref_index = klass_ref_index_at(which);
758 return klass_at_noresolve(ref_index);
759 }
760
761 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
762 jint ref_index = uncached_klass_ref_index_at(which);
763 return klass_at_noresolve(ref_index);
764 }
765
766 char* ConstantPool::string_at_noresolve(int which) {
767 return unresolved_string_at(which)->as_C_string();
768 }
769
770 BasicType ConstantPool::basic_type_for_signature_at(int which) const {
771 return Signature::basic_type(symbol_at(which));
772 }
773
774
775 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) {
776 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused
777 if (this_cp->tag_at(index).is_string()) {
778 this_cp->string_at(index, CHECK);
779 }
780 }
781 }
782
783 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) {
784 // Dig out the detailed message to reuse if possible
785 Symbol* message = java_lang_Throwable::detail_message(pending_exception);
786 if (message != NULL) {
787 return message;
788 }
789
790 // Return specific message for the tag
791 switch (tag.value()) {
792 case JVM_CONSTANT_UnresolvedClass:
793 // return the class name in the error message
794 message = this_cp->klass_name_at(which);
795 break;
796 case JVM_CONSTANT_MethodHandle:
797 // return the method handle name in the error message
798 message = this_cp->method_handle_name_ref_at(which);
799 break;
800 case JVM_CONSTANT_MethodType:
801 // return the method type signature in the error message
802 message = this_cp->method_type_signature_at(which);
803 break;
804 case JVM_CONSTANT_Dynamic:
805 // return the name of the condy in the error message
806 message = this_cp->uncached_name_ref_at(which);
807 break;
808 default:
809 ShouldNotReachHere();
810 }
811
812 return message;
813 }
814
815 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) {
816 Symbol* message = NULL;
817 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message);
818 assert(error != NULL, "checking");
819 CLEAR_PENDING_EXCEPTION;
820 if (message != NULL) {
821 ResourceMark rm;
822 THROW_MSG(error, message->as_C_string());
823 } else {
824 THROW(error);
825 }
826 }
827
828 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the
829 // exception in the resolution error table, so that the same exception is thrown again.
830 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which,
831 constantTag tag, TRAPS) {
832 Symbol* error = PENDING_EXCEPTION->klass()->name();
833
834 int error_tag = tag.error_value();
835
836 if (!PENDING_EXCEPTION->
837 is_a(SystemDictionary::LinkageError_klass())) {
838 // Just throw the exception and don't prevent these classes from
839 // being loaded due to virtual machine errors like StackOverflow
840 // and OutOfMemoryError, etc, or if the thread was hit by stop()
841 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
842 } else if (this_cp->tag_at(which).value() != error_tag) {
843 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION);
844 SystemDictionary::add_resolution_error(this_cp, which, error, message);
845 // CAS in the tag. If a thread beat us to registering this error that's fine.
846 // If another thread resolved the reference, this is a race condition. This
847 // thread may have had a security manager or something temporary.
848 // This doesn't deterministically get an error. So why do we save this?
849 // We save this because jvmti can add classes to the bootclass path after
850 // this error, so it needs to get the same error if the error is first.
851 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which),
852 (jbyte)tag.value(),
853 (jbyte)error_tag);
854 if (old_tag != error_tag && old_tag != tag.value()) {
855 // MethodHandles and MethodType doesn't change to resolved version.
856 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value");
857 // Forget the exception and use the resolved class.
858 CLEAR_PENDING_EXCEPTION;
859 }
860 } else {
861 // some other thread put this in error state
862 throw_resolution_error(this_cp, which, CHECK);
863 }
864 }
865
866 constantTag ConstantPool::constant_tag_at(int which) {
867 constantTag tag = tag_at(which);
868 if (tag.is_dynamic_constant() ||
869 tag.is_dynamic_constant_in_error()) {
870 BasicType bt = basic_type_for_constant_at(which);
871 // dynamic constant could return an array, treat as object
872 return constantTag::ofBasicType(is_reference_type(bt) ? T_OBJECT : bt);
873 }
874 return tag;
875 }
876
877 BasicType ConstantPool::basic_type_for_constant_at(int which) {
878 constantTag tag = tag_at(which);
879 if (tag.is_dynamic_constant() ||
880 tag.is_dynamic_constant_in_error()) {
881 // have to look at the signature for this one
882 Symbol* constant_type = uncached_signature_ref_at(which);
883 return Signature::basic_type(constant_type);
884 }
885 return tag.basic_type();
886 }
887
888 // Called to resolve constants in the constant pool and return an oop.
889 // Some constant pool entries cache their resolved oop. This is also
890 // called to create oops from constants to use in arguments for invokedynamic
891 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
892 int index, int cache_index,
893 bool* status_return, TRAPS) {
894 oop result_oop = NULL;
895 Handle throw_exception;
896
897 if (cache_index == _possible_index_sentinel) {
898 // It is possible that this constant is one which is cached in the objects.
899 // We'll do a linear search. This should be OK because this usage is rare.
900 // FIXME: If bootstrap specifiers stress this code, consider putting in
901 // a reverse index. Binary search over a short array should do it.
902 assert(index > 0, "valid index");
903 cache_index = this_cp->cp_to_object_index(index);
904 }
905 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
906 assert(index == _no_index_sentinel || index >= 0, "");
907
908 if (cache_index >= 0) {
909 result_oop = this_cp->resolved_references()->obj_at(cache_index);
910 if (result_oop != NULL) {
911 if (result_oop == Universe::the_null_sentinel()) {
912 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index)));
913 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel");
914 result_oop = NULL;
915 }
916 if (status_return != NULL) (*status_return) = true;
917 return result_oop;
918 // That was easy...
919 }
920 index = this_cp->object_to_cp_index(cache_index);
921 }
922
923 jvalue prim_value; // temp used only in a few cases below
924
925 constantTag tag = this_cp->tag_at(index);
926
927 if (status_return != NULL) {
928 // don't trigger resolution if the constant might need it
929 switch (tag.value()) {
930 case JVM_CONSTANT_Class:
931 {
932 CPKlassSlot kslot = this_cp->klass_slot_at(index);
933 int resolved_klass_index = kslot.resolved_klass_index();
934 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) {
935 (*status_return) = false;
936 return NULL;
937 }
938 // the klass is waiting in the CP; go get it
939 break;
940 }
941 case JVM_CONSTANT_String:
942 case JVM_CONSTANT_Integer:
943 case JVM_CONSTANT_Float:
944 case JVM_CONSTANT_Long:
945 case JVM_CONSTANT_Double:
946 // these guys trigger OOM at worst
947 break;
948 default:
949 (*status_return) = false;
950 return NULL;
951 }
952 // from now on there is either success or an OOME
953 (*status_return) = true;
954 }
955
956 switch (tag.value()) {
957
958 case JVM_CONSTANT_UnresolvedClass:
959 case JVM_CONSTANT_UnresolvedClassInError:
960 case JVM_CONSTANT_Class:
961 {
962 assert(cache_index == _no_index_sentinel, "should not have been set");
963 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL);
964 // ldc wants the java mirror.
965 result_oop = resolved->java_mirror();
966 break;
967 }
968
969 case JVM_CONSTANT_Dynamic:
970 {
971 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop.
972 BootstrapInfo bootstrap_specifier(this_cp, index);
973
974 // The initial step in resolving an unresolved symbolic reference to a
975 // dynamically-computed constant is to resolve the symbolic reference to a
976 // method handle which will be the bootstrap method for the dynamically-computed
977 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap
978 // method fails, then a MethodHandleInError is stored at the corresponding
979 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to
980 // set a DynamicConstantInError here since any subsequent use of this
981 // bootstrap method will encounter the resolution of MethodHandleInError.
982 // Both the first, (resolution of the BSM and its static arguments), and the second tasks,
983 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method()
984 // for the bootstrap_specifier created above.
985 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD);
986 Exceptions::wrap_dynamic_exception(THREAD);
987 if (HAS_PENDING_EXCEPTION) {
988 // Resolution failure of the dynamically-computed constant, save_and_throw_exception
989 // will check for a LinkageError and store a DynamicConstantInError.
990 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
991 }
992 result_oop = bootstrap_specifier.resolved_value()();
993 BasicType type = Signature::basic_type(bootstrap_specifier.signature());
994 if (!is_reference_type(type)) {
995 // Make sure the primitive value is properly boxed.
996 // This is a JDK responsibility.
997 const char* fail = NULL;
998 if (result_oop == NULL) {
999 fail = "null result instead of box";
1000 } else if (!is_java_primitive(type)) {
1001 // FIXME: support value types via unboxing
1002 fail = "can only handle references and primitives";
1003 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) {
1004 fail = "primitive is not properly boxed";
1005 }
1006 if (fail != NULL) {
1007 // Since this exception is not a LinkageError, throw exception
1008 // but do not save a DynamicInError resolution result.
1009 // See section 5.4.3 of the VM spec.
1010 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail);
1011 }
1012 }
1013
1014 if (TraceMethodHandles) {
1015 bootstrap_specifier.print_msg_on(tty, "resolve_constant_at_impl");
1016 }
1017 break;
1018 }
1019
1020 case JVM_CONSTANT_String:
1021 assert(cache_index != _no_index_sentinel, "should have been set");
1022 if (this_cp->is_pseudo_string_at(index)) {
1023 result_oop = this_cp->pseudo_string_at(index, cache_index);
1024 break;
1025 }
1026 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
1027 break;
1028
1029 case JVM_CONSTANT_DynamicInError:
1030 case JVM_CONSTANT_MethodHandleInError:
1031 case JVM_CONSTANT_MethodTypeInError:
1032 {
1033 throw_resolution_error(this_cp, index, CHECK_NULL);
1034 break;
1035 }
1036
1037 case JVM_CONSTANT_MethodHandle:
1038 {
1039 int ref_kind = this_cp->method_handle_ref_kind_at(index);
1040 int callee_index = this_cp->method_handle_klass_index_at(index);
1041 Symbol* name = this_cp->method_handle_name_ref_at(index);
1042 Symbol* signature = this_cp->method_handle_signature_ref_at(index);
1043 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index));
1044 { ResourceMark rm(THREAD);
1045 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
1046 ref_kind, index, this_cp->method_handle_index_at(index),
1047 callee_index, name->as_C_string(), signature->as_C_string());
1048 }
1049
1050 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL);
1051
1052 // Check constant pool method consistency
1053 if ((callee->is_interface() && m_tag.is_method()) ||
1054 ((!callee->is_interface() && m_tag.is_interface_method()))) {
1055 ResourceMark rm(THREAD);
1056 stringStream ss;
1057 ss.print("Inconsistent constant pool data in classfile for class %s. "
1058 "Method '", callee->name()->as_C_string());
1059 signature->print_as_signature_external_return_type(&ss);
1060 ss.print(" %s(", name->as_C_string());
1061 signature->print_as_signature_external_parameters(&ss);
1062 ss.print(")' at index %d is %s and should be %s",
1063 index,
1064 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
1065 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
1066 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
1067 }
1068
1069 Klass* klass = this_cp->pool_holder();
1070 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
1071 callee, name, signature,
1072 THREAD);
1073 result_oop = value();
1074 if (HAS_PENDING_EXCEPTION) {
1075 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1076 }
1077 break;
1078 }
1079
1080 case JVM_CONSTANT_MethodType:
1081 {
1082 Symbol* signature = this_cp->method_type_signature_at(index);
1083 { ResourceMark rm(THREAD);
1084 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
1085 index, this_cp->method_type_index_at(index),
1086 signature->as_C_string());
1087 }
1088 Klass* klass = this_cp->pool_holder();
1089 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
1090 result_oop = value();
1091 if (HAS_PENDING_EXCEPTION) {
1092 save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
1093 }
1094 break;
1095 }
1096
1097 case JVM_CONSTANT_Integer:
1098 assert(cache_index == _no_index_sentinel, "should not have been set");
1099 prim_value.i = this_cp->int_at(index);
1100 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
1101 break;
1102
1103 case JVM_CONSTANT_Float:
1104 assert(cache_index == _no_index_sentinel, "should not have been set");
1105 prim_value.f = this_cp->float_at(index);
1106 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
1107 break;
1108
1109 case JVM_CONSTANT_Long:
1110 assert(cache_index == _no_index_sentinel, "should not have been set");
1111 prim_value.j = this_cp->long_at(index);
1112 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
1113 break;
1114
1115 case JVM_CONSTANT_Double:
1116 assert(cache_index == _no_index_sentinel, "should not have been set");
1117 prim_value.d = this_cp->double_at(index);
1118 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
1119 break;
1120
1121 default:
1122 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
1123 this_cp(), index, cache_index, tag.value()));
1124 assert(false, "unexpected constant tag");
1125 break;
1126 }
1127
1128 if (cache_index >= 0) {
1129 // Benign race condition: resolved_references may already be filled in.
1130 // The important thing here is that all threads pick up the same result.
1131 // It doesn't matter which racing thread wins, as long as only one
1132 // result is used by all threads, and all future queries.
1133 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop);
1134 oop old_result = this_cp->resolved_references()
1135 ->atomic_compare_exchange_oop(cache_index, new_result, NULL);
1136 if (old_result == NULL) {
1137 return result_oop; // was installed
1138 } else {
1139 // Return the winning thread's result. This can be different than
1140 // the result here for MethodHandles.
1141 if (old_result == Universe::the_null_sentinel())
1142 old_result = NULL;
1143 return old_result;
1144 }
1145 } else {
1146 assert(result_oop != Universe::the_null_sentinel(), "");
1147 return result_oop;
1148 }
1149 }
1150
1151 oop ConstantPool::uncached_string_at(int which, TRAPS) {
1152 Symbol* sym = unresolved_string_at(which);
1153 oop str = StringTable::intern(sym, CHECK_(NULL));
1154 assert(java_lang_String::is_instance(str), "must be string");
1155 return str;
1156 }
1157
1158 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index,
1159 int start_arg, int end_arg,
1160 objArrayHandle info, int pos,
1161 bool must_resolve, Handle if_not_available,
1162 TRAPS) {
1163 int argc;
1164 int limit = pos + end_arg - start_arg;
1165 // checks: index in range [0..this_cp->length),
1166 // tag at index, start..end in range [0..argc],
1167 // info array non-null, pos..limit in [0..info.length]
1168 if ((0 >= index || index >= this_cp->length()) ||
1169 !(this_cp->tag_at(index).is_invoke_dynamic() ||
1170 this_cp->tag_at(index).is_dynamic_constant()) ||
1171 (0 > start_arg || start_arg > end_arg) ||
1172 (end_arg > (argc = this_cp->bootstrap_argument_count_at(index))) ||
1173 (0 > pos || pos > limit) ||
1174 (info.is_null() || limit > info->length())) {
1175 // An index or something else went wrong; throw an error.
1176 // Since this is an internal API, we don't expect this,
1177 // so we don't bother to craft a nice message.
1178 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access");
1179 }
1180 // now we can loop safely
1181 int info_i = pos;
1182 for (int i = start_arg; i < end_arg; i++) {
1183 int arg_index = this_cp->bootstrap_argument_index_at(index, i);
1184 oop arg_oop;
1185 if (must_resolve) {
1186 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK);
1187 } else {
1188 bool found_it = false;
1189 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK);
1190 if (!found_it) arg_oop = if_not_available();
1191 }
1192 info->obj_at_put(info_i++, arg_oop);
1193 }
1194 }
1195
1196 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) {
1197 // If the string has already been interned, this entry will be non-null
1198 oop str = this_cp->resolved_references()->obj_at(obj_index);
1199 assert(str != Universe::the_null_sentinel(), "");
1200 if (str != NULL) return str;
1201 Symbol* sym = this_cp->unresolved_string_at(which);
1202 str = StringTable::intern(sym, CHECK_(NULL));
1203 this_cp->string_at_put(which, obj_index, str);
1204 assert(java_lang_String::is_instance(str), "must be string");
1205 return str;
1206 }
1207
1208
1209 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) {
1210 // Names are interned, so we can compare Symbol*s directly
1211 Symbol* cp_name = klass_name_at(which);
1212 return (cp_name == k->name());
1213 }
1214
1215
1216 // Iterate over symbols and decrement ones which are Symbol*s
1217 // This is done during GC.
1218 // Only decrement the UTF8 symbols. Strings point to
1219 // these symbols but didn't increment the reference count.
1220 void ConstantPool::unreference_symbols() {
1221 for (int index = 1; index < length(); index++) { // Index 0 is unused
1222 constantTag tag = tag_at(index);
1223 if (tag.is_symbol()) {
1224 symbol_at(index)->decrement_refcount();
1225 }
1226 }
1227 }
1228
1229
1230 // Compare this constant pool's entry at index1 to the constant pool
1231 // cp2's entry at index2.
1232 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2,
1233 int index2, TRAPS) {
1234
1235 // The error tags are equivalent to non-error tags when comparing
1236 jbyte t1 = tag_at(index1).non_error_value();
1237 jbyte t2 = cp2->tag_at(index2).non_error_value();
1238
1239 if (t1 != t2) {
1240 // Not the same entry type so there is nothing else to check. Note
1241 // that this style of checking will consider resolved/unresolved
1242 // class pairs as different.
1243 // From the ConstantPool* API point of view, this is correct
1244 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
1245 // plays out in the context of ConstantPool* merging.
1246 return false;
1247 }
1248
1249 switch (t1) {
1250 case JVM_CONSTANT_Class:
1251 {
1252 Klass* k1 = klass_at(index1, CHECK_false);
1253 Klass* k2 = cp2->klass_at(index2, CHECK_false);
1254 if (k1 == k2) {
1255 return true;
1256 }
1257 } break;
1258
1259 case JVM_CONSTANT_ClassIndex:
1260 {
1261 int recur1 = klass_index_at(index1);
1262 int recur2 = cp2->klass_index_at(index2);
1263 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1264 if (match) {
1265 return true;
1266 }
1267 } break;
1268
1269 case JVM_CONSTANT_Double:
1270 {
1271 jdouble d1 = double_at(index1);
1272 jdouble d2 = cp2->double_at(index2);
1273 if (d1 == d2) {
1274 return true;
1275 }
1276 } break;
1277
1278 case JVM_CONSTANT_Fieldref:
1279 case JVM_CONSTANT_InterfaceMethodref:
1280 case JVM_CONSTANT_Methodref:
1281 {
1282 int recur1 = uncached_klass_ref_index_at(index1);
1283 int recur2 = cp2->uncached_klass_ref_index_at(index2);
1284 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1285 if (match) {
1286 recur1 = uncached_name_and_type_ref_index_at(index1);
1287 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
1288 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1289 if (match) {
1290 return true;
1291 }
1292 }
1293 } break;
1294
1295 case JVM_CONSTANT_Float:
1296 {
1297 jfloat f1 = float_at(index1);
1298 jfloat f2 = cp2->float_at(index2);
1299 if (f1 == f2) {
1300 return true;
1301 }
1302 } break;
1303
1304 case JVM_CONSTANT_Integer:
1305 {
1306 jint i1 = int_at(index1);
1307 jint i2 = cp2->int_at(index2);
1308 if (i1 == i2) {
1309 return true;
1310 }
1311 } break;
1312
1313 case JVM_CONSTANT_Long:
1314 {
1315 jlong l1 = long_at(index1);
1316 jlong l2 = cp2->long_at(index2);
1317 if (l1 == l2) {
1318 return true;
1319 }
1320 } break;
1321
1322 case JVM_CONSTANT_NameAndType:
1323 {
1324 int recur1 = name_ref_index_at(index1);
1325 int recur2 = cp2->name_ref_index_at(index2);
1326 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1327 if (match) {
1328 recur1 = signature_ref_index_at(index1);
1329 recur2 = cp2->signature_ref_index_at(index2);
1330 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1331 if (match) {
1332 return true;
1333 }
1334 }
1335 } break;
1336
1337 case JVM_CONSTANT_StringIndex:
1338 {
1339 int recur1 = string_index_at(index1);
1340 int recur2 = cp2->string_index_at(index2);
1341 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1342 if (match) {
1343 return true;
1344 }
1345 } break;
1346
1347 case JVM_CONSTANT_UnresolvedClass:
1348 {
1349 Symbol* k1 = klass_name_at(index1);
1350 Symbol* k2 = cp2->klass_name_at(index2);
1351 if (k1 == k2) {
1352 return true;
1353 }
1354 } break;
1355
1356 case JVM_CONSTANT_MethodType:
1357 {
1358 int k1 = method_type_index_at(index1);
1359 int k2 = cp2->method_type_index_at(index2);
1360 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1361 if (match) {
1362 return true;
1363 }
1364 } break;
1365
1366 case JVM_CONSTANT_MethodHandle:
1367 {
1368 int k1 = method_handle_ref_kind_at(index1);
1369 int k2 = cp2->method_handle_ref_kind_at(index2);
1370 if (k1 == k2) {
1371 int i1 = method_handle_index_at(index1);
1372 int i2 = cp2->method_handle_index_at(index2);
1373 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1374 if (match) {
1375 return true;
1376 }
1377 }
1378 } break;
1379
1380 case JVM_CONSTANT_Dynamic:
1381 {
1382 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1383 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1384 int i1 = bootstrap_methods_attribute_index(index1);
1385 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1386 // separate statements and variables because CHECK_false is used
1387 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1388 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1389 return (match_entry && match_operand);
1390 } break;
1391
1392 case JVM_CONSTANT_InvokeDynamic:
1393 {
1394 int k1 = bootstrap_name_and_type_ref_index_at(index1);
1395 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2);
1396 int i1 = bootstrap_methods_attribute_index(index1);
1397 int i2 = cp2->bootstrap_methods_attribute_index(index2);
1398 // separate statements and variables because CHECK_false is used
1399 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
1400 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
1401 return (match_entry && match_operand);
1402 } break;
1403
1404 case JVM_CONSTANT_String:
1405 {
1406 Symbol* s1 = unresolved_string_at(index1);
1407 Symbol* s2 = cp2->unresolved_string_at(index2);
1408 if (s1 == s2) {
1409 return true;
1410 }
1411 } break;
1412
1413 case JVM_CONSTANT_Utf8:
1414 {
1415 Symbol* s1 = symbol_at(index1);
1416 Symbol* s2 = cp2->symbol_at(index2);
1417 if (s1 == s2) {
1418 return true;
1419 }
1420 } break;
1421
1422 // Invalid is used as the tag for the second constant pool entry
1423 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1424 // not be seen by itself.
1425 case JVM_CONSTANT_Invalid: // fall through
1426
1427 default:
1428 ShouldNotReachHere();
1429 break;
1430 }
1431
1432 return false;
1433 } // end compare_entry_to()
1434
1435
1436 // Resize the operands array with delta_len and delta_size.
1437 // Used in RedefineClasses for CP merge.
1438 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
1439 int old_len = operand_array_length(operands());
1440 int new_len = old_len + delta_len;
1441 int min_len = (delta_len > 0) ? old_len : new_len;
1442
1443 int old_size = operands()->length();
1444 int new_size = old_size + delta_size;
1445 int min_size = (delta_size > 0) ? old_size : new_size;
1446
1447 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1448 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
1449
1450 // Set index in the resized array for existing elements only
1451 for (int idx = 0; idx < min_len; idx++) {
1452 int offset = operand_offset_at(idx); // offset in original array
1453 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
1454 }
1455 // Copy the bootstrap specifiers only
1456 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
1457 new_ops->adr_at(2*new_len),
1458 (min_size - 2*min_len) * sizeof(u2));
1459 // Explicitly deallocate old operands array.
1460 // Note, it is not needed for 7u backport.
1461 if ( operands() != NULL) { // the safety check
1462 MetadataFactory::free_array<u2>(loader_data, operands());
1463 }
1464 set_operands(new_ops);
1465 } // end resize_operands()
1466
1467
1468 // Extend the operands array with the length and size of the ext_cp operands.
1469 // Used in RedefineClasses for CP merge.
1470 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) {
1471 int delta_len = operand_array_length(ext_cp->operands());
1472 if (delta_len == 0) {
1473 return; // nothing to do
1474 }
1475 int delta_size = ext_cp->operands()->length();
1476
1477 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
1478
1479 if (operand_array_length(operands()) == 0) {
1480 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
1481 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
1482 // The first element index defines the offset of second part
1483 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
1484 set_operands(new_ops);
1485 } else {
1486 resize_operands(delta_len, delta_size, CHECK);
1487 }
1488
1489 } // end extend_operands()
1490
1491
1492 // Shrink the operands array to a smaller array with new_len length.
1493 // Used in RedefineClasses for CP merge.
1494 void ConstantPool::shrink_operands(int new_len, TRAPS) {
1495 int old_len = operand_array_length(operands());
1496 if (new_len == old_len) {
1497 return; // nothing to do
1498 }
1499 assert(new_len < old_len, "shrunken operands array must be smaller");
1500
1501 int free_base = operand_next_offset_at(new_len - 1);
1502 int delta_len = new_len - old_len;
1503 int delta_size = 2*delta_len + free_base - operands()->length();
1504
1505 resize_operands(delta_len, delta_size, CHECK);
1506
1507 } // end shrink_operands()
1508
1509
1510 void ConstantPool::copy_operands(const constantPoolHandle& from_cp,
1511 const constantPoolHandle& to_cp,
1512 TRAPS) {
1513
1514 int from_oplen = operand_array_length(from_cp->operands());
1515 int old_oplen = operand_array_length(to_cp->operands());
1516 if (from_oplen != 0) {
1517 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1518 // append my operands to the target's operands array
1519 if (old_oplen == 0) {
1520 // Can't just reuse from_cp's operand list because of deallocation issues
1521 int len = from_cp->operands()->length();
1522 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1523 Copy::conjoint_memory_atomic(
1524 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1525 to_cp->set_operands(new_ops);
1526 } else {
1527 int old_len = to_cp->operands()->length();
1528 int from_len = from_cp->operands()->length();
1529 int old_off = old_oplen * sizeof(u2);
1530 int from_off = from_oplen * sizeof(u2);
1531 // Use the metaspace for the destination constant pool
1532 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1533 int fillp = 0, len = 0;
1534 // first part of dest
1535 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1536 new_operands->adr_at(fillp),
1537 (len = old_off) * sizeof(u2));
1538 fillp += len;
1539 // first part of src
1540 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1541 new_operands->adr_at(fillp),
1542 (len = from_off) * sizeof(u2));
1543 fillp += len;
1544 // second part of dest
1545 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1546 new_operands->adr_at(fillp),
1547 (len = old_len - old_off) * sizeof(u2));
1548 fillp += len;
1549 // second part of src
1550 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1551 new_operands->adr_at(fillp),
1552 (len = from_len - from_off) * sizeof(u2));
1553 fillp += len;
1554 assert(fillp == new_operands->length(), "");
1555
1556 // Adjust indexes in the first part of the copied operands array.
1557 for (int j = 0; j < from_oplen; j++) {
1558 int offset = operand_offset_at(new_operands, old_oplen + j);
1559 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1560 offset += old_len; // every new tuple is preceded by old_len extra u2's
1561 operand_offset_at_put(new_operands, old_oplen + j, offset);
1562 }
1563
1564 // replace target operands array with combined array
1565 to_cp->set_operands(new_operands);
1566 }
1567 }
1568 } // end copy_operands()
1569
1570
1571 // Copy this constant pool's entries at start_i to end_i (inclusive)
1572 // to the constant pool to_cp's entries starting at to_i. A total of
1573 // (end_i - start_i) + 1 entries are copied.
1574 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i,
1575 const constantPoolHandle& to_cp, int to_i, TRAPS) {
1576
1577
1578 int dest_i = to_i; // leave original alone for debug purposes
1579
1580 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1581 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1582
1583 switch (from_cp->tag_at(src_i).value()) {
1584 case JVM_CONSTANT_Double:
1585 case JVM_CONSTANT_Long:
1586 // double and long take two constant pool entries
1587 src_i += 2;
1588 dest_i += 2;
1589 break;
1590
1591 default:
1592 // all others take one constant pool entry
1593 src_i++;
1594 dest_i++;
1595 break;
1596 }
1597 }
1598 copy_operands(from_cp, to_cp, CHECK);
1599
1600 } // end copy_cp_to_impl()
1601
1602
1603 // Copy this constant pool's entry at from_i to the constant pool
1604 // to_cp's entry at to_i.
1605 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i,
1606 const constantPoolHandle& to_cp, int to_i,
1607 TRAPS) {
1608
1609 int tag = from_cp->tag_at(from_i).value();
1610 switch (tag) {
1611 case JVM_CONSTANT_ClassIndex:
1612 {
1613 jint ki = from_cp->klass_index_at(from_i);
1614 to_cp->klass_index_at_put(to_i, ki);
1615 } break;
1616
1617 case JVM_CONSTANT_Double:
1618 {
1619 jdouble d = from_cp->double_at(from_i);
1620 to_cp->double_at_put(to_i, d);
1621 // double takes two constant pool entries so init second entry's tag
1622 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1623 } break;
1624
1625 case JVM_CONSTANT_Fieldref:
1626 {
1627 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1628 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1629 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1630 } break;
1631
1632 case JVM_CONSTANT_Float:
1633 {
1634 jfloat f = from_cp->float_at(from_i);
1635 to_cp->float_at_put(to_i, f);
1636 } break;
1637
1638 case JVM_CONSTANT_Integer:
1639 {
1640 jint i = from_cp->int_at(from_i);
1641 to_cp->int_at_put(to_i, i);
1642 } break;
1643
1644 case JVM_CONSTANT_InterfaceMethodref:
1645 {
1646 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1647 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1648 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1649 } break;
1650
1651 case JVM_CONSTANT_Long:
1652 {
1653 jlong l = from_cp->long_at(from_i);
1654 to_cp->long_at_put(to_i, l);
1655 // long takes two constant pool entries so init second entry's tag
1656 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1657 } break;
1658
1659 case JVM_CONSTANT_Methodref:
1660 {
1661 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1662 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1663 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1664 } break;
1665
1666 case JVM_CONSTANT_NameAndType:
1667 {
1668 int name_ref_index = from_cp->name_ref_index_at(from_i);
1669 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1670 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1671 } break;
1672
1673 case JVM_CONSTANT_StringIndex:
1674 {
1675 jint si = from_cp->string_index_at(from_i);
1676 to_cp->string_index_at_put(to_i, si);
1677 } break;
1678
1679 case JVM_CONSTANT_Class:
1680 case JVM_CONSTANT_UnresolvedClass:
1681 case JVM_CONSTANT_UnresolvedClassInError:
1682 {
1683 // Revert to JVM_CONSTANT_ClassIndex
1684 int name_index = from_cp->klass_slot_at(from_i).name_index();
1685 assert(from_cp->tag_at(name_index).is_symbol(), "sanity");
1686 to_cp->klass_index_at_put(to_i, name_index);
1687 } break;
1688
1689 case JVM_CONSTANT_String:
1690 {
1691 Symbol* s = from_cp->unresolved_string_at(from_i);
1692 to_cp->unresolved_string_at_put(to_i, s);
1693 } break;
1694
1695 case JVM_CONSTANT_Utf8:
1696 {
1697 Symbol* s = from_cp->symbol_at(from_i);
1698 // Need to increase refcount, the old one will be thrown away and deferenced
1699 s->increment_refcount();
1700 to_cp->symbol_at_put(to_i, s);
1701 } break;
1702
1703 case JVM_CONSTANT_MethodType:
1704 case JVM_CONSTANT_MethodTypeInError:
1705 {
1706 jint k = from_cp->method_type_index_at(from_i);
1707 to_cp->method_type_index_at_put(to_i, k);
1708 } break;
1709
1710 case JVM_CONSTANT_MethodHandle:
1711 case JVM_CONSTANT_MethodHandleInError:
1712 {
1713 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1714 int k2 = from_cp->method_handle_index_at(from_i);
1715 to_cp->method_handle_index_at_put(to_i, k1, k2);
1716 } break;
1717
1718 case JVM_CONSTANT_Dynamic:
1719 case JVM_CONSTANT_DynamicInError:
1720 {
1721 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1722 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1723 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1724 to_cp->dynamic_constant_at_put(to_i, k1, k2);
1725 } break;
1726
1727 case JVM_CONSTANT_InvokeDynamic:
1728 {
1729 int k1 = from_cp->bootstrap_methods_attribute_index(from_i);
1730 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i);
1731 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1732 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1733 } break;
1734
1735 // Invalid is used as the tag for the second constant pool entry
1736 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1737 // not be seen by itself.
1738 case JVM_CONSTANT_Invalid: // fall through
1739
1740 default:
1741 {
1742 ShouldNotReachHere();
1743 } break;
1744 }
1745 } // end copy_entry_to()
1746
1747 // Search constant pool search_cp for an entry that matches this
1748 // constant pool's entry at pattern_i. Returns the index of a
1749 // matching entry or zero (0) if there is no matching entry.
1750 int ConstantPool::find_matching_entry(int pattern_i,
1751 const constantPoolHandle& search_cp, TRAPS) {
1752
1753 // index zero (0) is not used
1754 for (int i = 1; i < search_cp->length(); i++) {
1755 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1756 if (found) {
1757 return i;
1758 }
1759 }
1760
1761 return 0; // entry not found; return unused index zero (0)
1762 } // end find_matching_entry()
1763
1764
1765 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
1766 // cp2's bootstrap specifier at idx2.
1767 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) {
1768 int k1 = operand_bootstrap_method_ref_index_at(idx1);
1769 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
1770 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1771
1772 if (!match) {
1773 return false;
1774 }
1775 int argc = operand_argument_count_at(idx1);
1776 if (argc == cp2->operand_argument_count_at(idx2)) {
1777 for (int j = 0; j < argc; j++) {
1778 k1 = operand_argument_index_at(idx1, j);
1779 k2 = cp2->operand_argument_index_at(idx2, j);
1780 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1781 if (!match) {
1782 return false;
1783 }
1784 }
1785 return true; // got through loop; all elements equal
1786 }
1787 return false;
1788 } // end compare_operand_to()
1789
1790 // Search constant pool search_cp for a bootstrap specifier that matches
1791 // this constant pool's bootstrap specifier data at pattern_i index.
1792 // Return the index of a matching bootstrap attribute record or (-1) if there is no match.
1793 int ConstantPool::find_matching_operand(int pattern_i,
1794 const constantPoolHandle& search_cp, int search_len, TRAPS) {
1795 for (int i = 0; i < search_len; i++) {
1796 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
1797 if (found) {
1798 return i;
1799 }
1800 }
1801 return -1; // bootstrap specifier data not found; return unused index (-1)
1802 } // end find_matching_operand()
1803
1804
1805 #ifndef PRODUCT
1806
1807 const char* ConstantPool::printable_name_at(int which) {
1808
1809 constantTag tag = tag_at(which);
1810
1811 if (tag.is_string()) {
1812 return string_at_noresolve(which);
1813 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1814 return klass_name_at(which)->as_C_string();
1815 } else if (tag.is_symbol()) {
1816 return symbol_at(which)->as_C_string();
1817 }
1818 return "";
1819 }
1820
1821 #endif // PRODUCT
1822
1823
1824 // JVMTI GetConstantPool support
1825
1826 // For debugging of constant pool
1827 const bool debug_cpool = false;
1828
1829 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
1830
1831 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1832 const char* WARN_MSG = "Must not be such entry!";
1833 jint size = 0;
1834 u2 idx1, idx2;
1835
1836 for (jint idx = 1; idx < cnt; idx++) {
1837 jint ent_size = 0;
1838 u1 tag = *bytes++;
1839 size++; // count tag
1840
1841 printf("const #%03d, tag: %02d ", idx, tag);
1842 switch(tag) {
1843 case JVM_CONSTANT_Invalid: {
1844 printf("Invalid");
1845 break;
1846 }
1847 case JVM_CONSTANT_Unicode: {
1848 printf("Unicode %s", WARN_MSG);
1849 break;
1850 }
1851 case JVM_CONSTANT_Utf8: {
1852 u2 len = Bytes::get_Java_u2(bytes);
1853 char str[128];
1854 if (len > 127) {
1855 len = 127;
1856 }
1857 strncpy(str, (char *) (bytes+2), len);
1858 str[len] = '\0';
1859 printf("Utf8 \"%s\"", str);
1860 ent_size = 2 + len;
1861 break;
1862 }
1863 case JVM_CONSTANT_Integer: {
1864 u4 val = Bytes::get_Java_u4(bytes);
1865 printf("int %d", *(int *) &val);
1866 ent_size = 4;
1867 break;
1868 }
1869 case JVM_CONSTANT_Float: {
1870 u4 val = Bytes::get_Java_u4(bytes);
1871 printf("float %5.3ff", *(float *) &val);
1872 ent_size = 4;
1873 break;
1874 }
1875 case JVM_CONSTANT_Long: {
1876 u8 val = Bytes::get_Java_u8(bytes);
1877 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val);
1878 ent_size = 8;
1879 idx++; // Long takes two cpool slots
1880 break;
1881 }
1882 case JVM_CONSTANT_Double: {
1883 u8 val = Bytes::get_Java_u8(bytes);
1884 printf("double %5.3fd", *(jdouble *)&val);
1885 ent_size = 8;
1886 idx++; // Double takes two cpool slots
1887 break;
1888 }
1889 case JVM_CONSTANT_Class: {
1890 idx1 = Bytes::get_Java_u2(bytes);
1891 printf("class #%03d", idx1);
1892 ent_size = 2;
1893 break;
1894 }
1895 case (JVM_CONSTANT_Class | JVM_CONSTANT_QDescBit): {
1896 idx1 = Bytes::get_Java_u2(bytes);
1897 printf("qclass #%03d", idx1);
1898 ent_size = 2;
1899 break;
1900 }
1901 case JVM_CONSTANT_String: {
1902 idx1 = Bytes::get_Java_u2(bytes);
1903 printf("String #%03d", idx1);
1904 ent_size = 2;
1905 break;
1906 }
1907 case JVM_CONSTANT_Fieldref: {
1908 idx1 = Bytes::get_Java_u2(bytes);
1909 idx2 = Bytes::get_Java_u2(bytes+2);
1910 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1911 ent_size = 4;
1912 break;
1913 }
1914 case JVM_CONSTANT_Methodref: {
1915 idx1 = Bytes::get_Java_u2(bytes);
1916 idx2 = Bytes::get_Java_u2(bytes+2);
1917 printf("Method #%03d, #%03d", idx1, idx2);
1918 ent_size = 4;
1919 break;
1920 }
1921 case JVM_CONSTANT_InterfaceMethodref: {
1922 idx1 = Bytes::get_Java_u2(bytes);
1923 idx2 = Bytes::get_Java_u2(bytes+2);
1924 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1925 ent_size = 4;
1926 break;
1927 }
1928 case JVM_CONSTANT_NameAndType: {
1929 idx1 = Bytes::get_Java_u2(bytes);
1930 idx2 = Bytes::get_Java_u2(bytes+2);
1931 printf("NameAndType #%03d, #%03d", idx1, idx2);
1932 ent_size = 4;
1933 break;
1934 }
1935 case JVM_CONSTANT_ClassIndex: {
1936 printf("ClassIndex %s", WARN_MSG);
1937 break;
1938 }
1939 case JVM_CONSTANT_UnresolvedClass: {
1940 printf("UnresolvedClass: %s", WARN_MSG);
1941 break;
1942 }
1943 case (JVM_CONSTANT_UnresolvedClass | JVM_CONSTANT_QDescBit): {
1944 printf("UnresolvedQClass: %s", WARN_MSG);
1945 break;
1946 }
1947 case JVM_CONSTANT_UnresolvedClassInError: {
1948 printf("UnresolvedClassInErr: %s", WARN_MSG);
1949 break;
1950 }
1951 case JVM_CONSTANT_StringIndex: {
1952 printf("StringIndex: %s", WARN_MSG);
1953 break;
1954 }
1955 }
1956 printf(";\n");
1957 bytes += ent_size;
1958 size += ent_size;
1959 }
1960 printf("Cpool size: %d\n", size);
1961 fflush(0);
1962 return;
1963 } /* end print_cpool_bytes */
1964
1965
1966 // Returns size of constant pool entry.
1967 jint ConstantPool::cpool_entry_size(jint idx) {
1968 switch(tag_at(idx).value()) {
1969 case JVM_CONSTANT_Invalid:
1970 case JVM_CONSTANT_Unicode:
1971 return 1;
1972
1973 case JVM_CONSTANT_Utf8:
1974 return 3 + symbol_at(idx)->utf8_length();
1975
1976 case JVM_CONSTANT_Class:
1977 case JVM_CONSTANT_String:
1978 case JVM_CONSTANT_ClassIndex:
1979 case JVM_CONSTANT_UnresolvedClass:
1980 case JVM_CONSTANT_UnresolvedClassInError:
1981 case JVM_CONSTANT_StringIndex:
1982 case JVM_CONSTANT_MethodType:
1983 case JVM_CONSTANT_MethodTypeInError:
1984 return 3;
1985
1986 case JVM_CONSTANT_MethodHandle:
1987 case JVM_CONSTANT_MethodHandleInError:
1988 return 4; //tag, ref_kind, ref_index
1989
1990 case JVM_CONSTANT_Integer:
1991 case JVM_CONSTANT_Float:
1992 case JVM_CONSTANT_Fieldref:
1993 case JVM_CONSTANT_Methodref:
1994 case JVM_CONSTANT_InterfaceMethodref:
1995 case JVM_CONSTANT_NameAndType:
1996 return 5;
1997
1998 case JVM_CONSTANT_Dynamic:
1999 case JVM_CONSTANT_DynamicInError:
2000 case JVM_CONSTANT_InvokeDynamic:
2001 // u1 tag, u2 bsm, u2 nt
2002 return 5;
2003
2004 case JVM_CONSTANT_Long:
2005 case JVM_CONSTANT_Double:
2006 return 9;
2007 }
2008 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
2009 return 1;
2010 } /* end cpool_entry_size */
2011
2012
2013 // SymbolHashMap is used to find a constant pool index from a string.
2014 // This function fills in SymbolHashMaps, one for utf8s and one for
2015 // class names, returns size of the cpool raw bytes.
2016 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
2017 SymbolHashMap *classmap) {
2018 jint size = 0;
2019
2020 for (u2 idx = 1; idx < length(); idx++) {
2021 u2 tag = tag_at(idx).value();
2022 size += cpool_entry_size(idx);
2023
2024 switch(tag) {
2025 case JVM_CONSTANT_Utf8: {
2026 Symbol* sym = symbol_at(idx);
2027 symmap->add_entry(sym, idx);
2028 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
2029 break;
2030 }
2031 case JVM_CONSTANT_Class:
2032 case JVM_CONSTANT_UnresolvedClass:
2033 case JVM_CONSTANT_UnresolvedClassInError: {
2034 Symbol* sym = klass_name_at(idx);
2035 classmap->add_entry(sym, idx);
2036 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
2037 break;
2038 }
2039 case JVM_CONSTANT_Long:
2040 case JVM_CONSTANT_Double: {
2041 idx++; // Both Long and Double take two cpool slots
2042 break;
2043 }
2044 }
2045 }
2046 return size;
2047 } /* end hash_utf8_entries_to */
2048
2049
2050 // Copy cpool bytes.
2051 // Returns:
2052 // 0, in case of OutOfMemoryError
2053 // -1, in case of internal error
2054 // > 0, count of the raw cpool bytes that have been copied
2055 int ConstantPool::copy_cpool_bytes(int cpool_size,
2056 SymbolHashMap* tbl,
2057 unsigned char *bytes) {
2058 u2 idx1, idx2;
2059 jint size = 0;
2060 jint cnt = length();
2061 unsigned char *start_bytes = bytes;
2062
2063 for (jint idx = 1; idx < cnt; idx++) {
2064 u1 tag = tag_at(idx).value();
2065 jint ent_size = cpool_entry_size(idx);
2066
2067 assert(size + ent_size <= cpool_size, "Size mismatch");
2068
2069 *bytes = tag;
2070 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag));
2071 switch(tag) {
2072 case JVM_CONSTANT_Invalid: {
2073 DBG(printf("JVM_CONSTANT_Invalid"));
2074 break;
2075 }
2076 case JVM_CONSTANT_Unicode: {
2077 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
2078 DBG(printf("JVM_CONSTANT_Unicode"));
2079 break;
2080 }
2081 case JVM_CONSTANT_Utf8: {
2082 Symbol* sym = symbol_at(idx);
2083 char* str = sym->as_utf8();
2084 // Warning! It's crashing on x86 with len = sym->utf8_length()
2085 int len = (int) strlen(str);
2086 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
2087 for (int i = 0; i < len; i++) {
2088 bytes[3+i] = (u1) str[i];
2089 }
2090 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
2091 break;
2092 }
2093 case JVM_CONSTANT_Integer: {
2094 jint val = int_at(idx);
2095 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2096 break;
2097 }
2098 case JVM_CONSTANT_Float: {
2099 jfloat val = float_at(idx);
2100 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
2101 break;
2102 }
2103 case JVM_CONSTANT_Long: {
2104 jlong val = long_at(idx);
2105 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2106 idx++; // Long takes two cpool slots
2107 break;
2108 }
2109 case JVM_CONSTANT_Double: {
2110 jdouble val = double_at(idx);
2111 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
2112 idx++; // Double takes two cpool slots
2113 break;
2114 }
2115 case JVM_CONSTANT_Class:
2116 case JVM_CONSTANT_UnresolvedClass:
2117 case JVM_CONSTANT_UnresolvedClassInError: {
2118 assert(!tag_at(idx).is_Qdescriptor_klass(), "Failed to encode QDesc");
2119 *bytes = JVM_CONSTANT_Class;
2120 Symbol* sym = klass_name_at(idx);
2121 idx1 = tbl->symbol_to_value(sym);
2122 assert(idx1 != 0, "Have not found a hashtable entry");
2123 Bytes::put_Java_u2((address) (bytes+1), idx1);
2124 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
2125 break;
2126 }
2127 case JVM_CONSTANT_String: {
2128 *bytes = JVM_CONSTANT_String;
2129 Symbol* sym = unresolved_string_at(idx);
2130 idx1 = tbl->symbol_to_value(sym);
2131 assert(idx1 != 0, "Have not found a hashtable entry");
2132 Bytes::put_Java_u2((address) (bytes+1), idx1);
2133 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
2134 break;
2135 }
2136 case JVM_CONSTANT_Fieldref:
2137 case JVM_CONSTANT_Methodref:
2138 case JVM_CONSTANT_InterfaceMethodref: {
2139 idx1 = uncached_klass_ref_index_at(idx);
2140 idx2 = uncached_name_and_type_ref_index_at(idx);
2141 Bytes::put_Java_u2((address) (bytes+1), idx1);
2142 Bytes::put_Java_u2((address) (bytes+3), idx2);
2143 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
2144 break;
2145 }
2146 case JVM_CONSTANT_NameAndType: {
2147 idx1 = name_ref_index_at(idx);
2148 idx2 = signature_ref_index_at(idx);
2149 Bytes::put_Java_u2((address) (bytes+1), idx1);
2150 Bytes::put_Java_u2((address) (bytes+3), idx2);
2151 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
2152 break;
2153 }
2154 case JVM_CONSTANT_ClassIndex: {
2155 *bytes = JVM_CONSTANT_Class;
2156 idx1 = klass_index_at(idx);
2157 Bytes::put_Java_u2((address) (bytes+1), idx1);
2158 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
2159 break;
2160 }
2161 case JVM_CONSTANT_StringIndex: {
2162 *bytes = JVM_CONSTANT_String;
2163 idx1 = string_index_at(idx);
2164 Bytes::put_Java_u2((address) (bytes+1), idx1);
2165 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
2166 break;
2167 }
2168 case JVM_CONSTANT_MethodHandle:
2169 case JVM_CONSTANT_MethodHandleInError: {
2170 *bytes = JVM_CONSTANT_MethodHandle;
2171 int kind = method_handle_ref_kind_at(idx);
2172 idx1 = method_handle_index_at(idx);
2173 *(bytes+1) = (unsigned char) kind;
2174 Bytes::put_Java_u2((address) (bytes+2), idx1);
2175 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
2176 break;
2177 }
2178 case JVM_CONSTANT_MethodType:
2179 case JVM_CONSTANT_MethodTypeInError: {
2180 *bytes = JVM_CONSTANT_MethodType;
2181 idx1 = method_type_index_at(idx);
2182 Bytes::put_Java_u2((address) (bytes+1), idx1);
2183 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
2184 break;
2185 }
2186 case JVM_CONSTANT_Dynamic:
2187 case JVM_CONSTANT_DynamicInError: {
2188 *bytes = tag;
2189 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2190 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2191 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2192 Bytes::put_Java_u2((address) (bytes+1), idx1);
2193 Bytes::put_Java_u2((address) (bytes+3), idx2);
2194 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2));
2195 break;
2196 }
2197 case JVM_CONSTANT_InvokeDynamic: {
2198 *bytes = tag;
2199 idx1 = extract_low_short_from_int(*int_at_addr(idx));
2200 idx2 = extract_high_short_from_int(*int_at_addr(idx));
2201 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4");
2202 Bytes::put_Java_u2((address) (bytes+1), idx1);
2203 Bytes::put_Java_u2((address) (bytes+3), idx2);
2204 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
2205 break;
2206 }
2207 }
2208 DBG(printf("\n"));
2209 bytes += ent_size;
2210 size += ent_size;
2211 }
2212 assert(size == cpool_size, "Size mismatch");
2213
2214 // Keep temorarily for debugging until it's stable.
2215 DBG(print_cpool_bytes(cnt, start_bytes));
2216 return (int)(bytes - start_bytes);
2217 } /* end copy_cpool_bytes */
2218
2219 #undef DBG
2220
2221
2222 void ConstantPool::set_on_stack(const bool value) {
2223 if (value) {
2224 // Only record if it's not already set.
2225 if (!on_stack()) {
2226 assert(!is_shared(), "should always be set for shared constant pools");
2227 _flags |= _on_stack;
2228 MetadataOnStackMark::record(this);
2229 }
2230 } else {
2231 // Clearing is done single-threadedly.
2232 if (!is_shared()) {
2233 _flags &= ~_on_stack;
2234 }
2235 }
2236 }
2237
2238 // JSR 292 support for patching constant pool oops after the class is linked and
2239 // the oop array for resolved references are created.
2240 // We can't do this during classfile parsing, which is how the other indexes are
2241 // patched. The other patches are applied early for some error checking
2242 // so only defer the pseudo_strings.
2243 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) {
2244 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
2245 Handle patch = cp_patches->at(index);
2246 if (patch.not_null()) {
2247 assert (tag_at(index).is_string(), "should only be string left");
2248 // Patching a string means pre-resolving it.
2249 // The spelling in the constant pool is ignored.
2250 // The constant reference may be any object whatever.
2251 // If it is not a real interned string, the constant is referred
2252 // to as a "pseudo-string", and must be presented to the CP
2253 // explicitly, because it may require scavenging.
2254 int obj_index = cp_to_object_index(index);
2255 pseudo_string_at_put(index, obj_index, patch());
2256 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
2257 }
2258 }
2259 #ifdef ASSERT
2260 // Ensure that all the patches have been used.
2261 for (int index = 0; index < cp_patches->length(); index++) {
2262 assert(cp_patches->at(index).is_null(),
2263 "Unused constant pool patch at %d in class file %s",
2264 index,
2265 pool_holder()->external_name());
2266 }
2267 #endif // ASSERT
2268 }
2269
2270 // Printing
2271
2272 void ConstantPool::print_on(outputStream* st) const {
2273 assert(is_constantPool(), "must be constantPool");
2274 st->print_cr("%s", internal_name());
2275 if (flags() != 0) {
2276 st->print(" - flags: 0x%x", flags());
2277 if (has_preresolution()) st->print(" has_preresolution");
2278 if (on_stack()) st->print(" on_stack");
2279 st->cr();
2280 }
2281 if (pool_holder() != NULL) {
2282 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder()));
2283 }
2284 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache()));
2285 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references()));
2286 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map()));
2287 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses()));
2288
2289 for (int index = 1; index < length(); index++) { // Index 0 is unused
2290 ((ConstantPool*)this)->print_entry_on(index, st);
2291 switch (tag_at(index).value()) {
2292 case JVM_CONSTANT_Long :
2293 case JVM_CONSTANT_Double :
2294 index++; // Skip entry following eigth-byte constant
2295 }
2296
2297 }
2298 st->cr();
2299 }
2300
2301 // Print one constant pool entry
2302 void ConstantPool::print_entry_on(const int index, outputStream* st) {
2303 EXCEPTION_MARK;
2304 st->print(" - %3d : ", index);
2305 tag_at(index).print_on(st);
2306 st->print(" : ");
2307 switch (tag_at(index).value()) {
2308 case JVM_CONSTANT_Class :
2309 { Klass* k = klass_at(index, CATCH);
2310 guarantee(k != NULL, "need klass");
2311 k->print_value_on(st);
2312 st->print(" {" PTR_FORMAT "}", p2i(k));
2313 }
2314 break;
2315 case JVM_CONSTANT_Fieldref :
2316 case JVM_CONSTANT_Methodref :
2317 case JVM_CONSTANT_InterfaceMethodref :
2318 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
2319 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
2320 break;
2321 case JVM_CONSTANT_String :
2322 if (is_pseudo_string_at(index)) {
2323 oop anObj = pseudo_string_at(index);
2324 anObj->print_value_on(st);
2325 st->print(" {" PTR_FORMAT "}", p2i(anObj));
2326 } else {
2327 unresolved_string_at(index)->print_value_on(st);
2328 }
2329 break;
2330 case JVM_CONSTANT_Integer :
2331 st->print("%d", int_at(index));
2332 break;
2333 case JVM_CONSTANT_Float :
2334 st->print("%f", float_at(index));
2335 break;
2336 case JVM_CONSTANT_Long :
2337 st->print_jlong(long_at(index));
2338 break;
2339 case JVM_CONSTANT_Double :
2340 st->print("%lf", double_at(index));
2341 break;
2342 case JVM_CONSTANT_NameAndType :
2343 st->print("name_index=%d", name_ref_index_at(index));
2344 st->print(" signature_index=%d", signature_ref_index_at(index));
2345 break;
2346 case JVM_CONSTANT_Utf8 :
2347 symbol_at(index)->print_value_on(st);
2348 break;
2349 case JVM_CONSTANT_ClassIndex: {
2350 int name_index = *int_at_addr(index);
2351 st->print("klass_index=%d ", name_index);
2352 symbol_at(name_index)->print_value_on(st);
2353 }
2354 break;
2355 case JVM_CONSTANT_UnresolvedClass : // fall-through
2356 case JVM_CONSTANT_UnresolvedClassInError: {
2357 CPKlassSlot kslot = klass_slot_at(index);
2358 int resolved_klass_index = kslot.resolved_klass_index();
2359 int name_index = kslot.name_index();
2360 assert(tag_at(name_index).is_symbol(), "sanity");
2361
2362 Klass* klass = resolved_klasses()->at(resolved_klass_index);
2363 if (klass != NULL) {
2364 klass->print_value_on(st);
2365 } else {
2366 symbol_at(name_index)->print_value_on(st);
2367 }
2368 }
2369 break;
2370 case JVM_CONSTANT_MethodHandle :
2371 case JVM_CONSTANT_MethodHandleInError :
2372 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
2373 st->print(" ref_index=%d", method_handle_index_at(index));
2374 break;
2375 case JVM_CONSTANT_MethodType :
2376 case JVM_CONSTANT_MethodTypeInError :
2377 st->print("signature_index=%d", method_type_index_at(index));
2378 break;
2379 case JVM_CONSTANT_Dynamic :
2380 case JVM_CONSTANT_DynamicInError :
2381 {
2382 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2383 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2384 int argc = bootstrap_argument_count_at(index);
2385 if (argc > 0) {
2386 for (int arg_i = 0; arg_i < argc; arg_i++) {
2387 int arg = bootstrap_argument_index_at(index, arg_i);
2388 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2389 }
2390 st->print("}");
2391 }
2392 }
2393 break;
2394 case JVM_CONSTANT_InvokeDynamic :
2395 {
2396 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index));
2397 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index));
2398 int argc = bootstrap_argument_count_at(index);
2399 if (argc > 0) {
2400 for (int arg_i = 0; arg_i < argc; arg_i++) {
2401 int arg = bootstrap_argument_index_at(index, arg_i);
2402 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
2403 }
2404 st->print("}");
2405 }
2406 }
2407 break;
2408 default:
2409 ShouldNotReachHere();
2410 break;
2411 }
2412 st->cr();
2413 }
2414
2415 void ConstantPool::print_value_on(outputStream* st) const {
2416 assert(is_constantPool(), "must be constantPool");
2417 st->print("constant pool [%d]", length());
2418 if (has_preresolution()) st->print("/preresolution");
2419 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
2420 print_address_on(st);
2421 if (pool_holder() != NULL) {
2422 st->print(" for ");
2423 pool_holder()->print_value_on(st);
2424 bool extra = (pool_holder()->constants() != this);
2425 if (extra) st->print(" (extra)");
2426 }
2427 if (cache() != NULL) {
2428 st->print(" cache=" PTR_FORMAT, p2i(cache()));
2429 }
2430 }
2431
2432 // Verification
2433
2434 void ConstantPool::verify_on(outputStream* st) {
2435 guarantee(is_constantPool(), "object must be constant pool");
2436 for (int i = 0; i< length(); i++) {
2437 constantTag tag = tag_at(i);
2438 if (tag.is_klass() || tag.is_unresolved_klass()) {
2439 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count");
2440 } else if (tag.is_symbol()) {
2441 CPSlot entry = slot_at(i);
2442 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2443 } else if (tag.is_string()) {
2444 CPSlot entry = slot_at(i);
2445 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
2446 }
2447 }
2448 if (pool_holder() != NULL) {
2449 // Note: pool_holder() can be NULL in temporary constant pools
2450 // used during constant pool merging
2451 guarantee(pool_holder()->is_klass(), "should be klass");
2452 }
2453 }
2454
2455
2456 SymbolHashMap::~SymbolHashMap() {
2457 SymbolHashMapEntry* next;
2458 for (int i = 0; i < _table_size; i++) {
2459 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
2460 next = cur->next();
2461 delete(cur);
2462 }
2463 }
2464 FREE_C_HEAP_ARRAY(SymbolHashMapBucket, _buckets);
2465 }
2466
2467 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2468 char *str = sym->as_utf8();
2469 unsigned int hash = compute_hash(str, sym->utf8_length());
2470 unsigned int index = hash % table_size();
2471
2472 // check if already in map
2473 // we prefer the first entry since it is more likely to be what was used in
2474 // the class file
2475 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2476 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2477 if (en->hash() == hash && en->symbol() == sym) {
2478 return; // already there
2479 }
2480 }
2481
2482 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2483 entry->set_next(bucket(index));
2484 _buckets[index].set_entry(entry);
2485 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2486 }
2487
2488 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2489 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2490 char *str = sym->as_utf8();
2491 int len = sym->utf8_length();
2492 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2493 unsigned int index = hash % table_size();
2494 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2495 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2496 if (en->hash() == hash && en->symbol() == sym) {
2497 return en;
2498 }
2499 }
2500 return NULL;
2501 }
2502
2503 void SymbolHashMap::initialize_table(int table_size) {
2504 _table_size = table_size;
2505 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
2506 for (int index = 0; index < table_size; index++) {
2507 _buckets[index].clear();
2508 }
2509 }