1 /*
2 * Copyright (c) 1998, 2023, 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 "cds/archiveBuilder.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/heapShared.hpp"
29 #include "classfile/resolutionErrors.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/systemDictionaryShared.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "code/codeCache.hpp"
34 #include "interpreter/bytecodeStream.hpp"
35 #include "interpreter/bytecodes.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "interpreter/linkResolver.hpp"
38 #include "interpreter/rewriter.hpp"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "memory/metadataFactory.hpp"
42 #include "memory/metaspaceClosure.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/access.inline.hpp"
45 #include "oops/compressedOops.hpp"
46 #include "oops/constantPool.inline.hpp"
47 #include "oops/cpCache.inline.hpp"
48 #include "oops/objArrayOop.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/resolvedFieldEntry.hpp"
51 #include "oops/resolvedIndyEntry.hpp"
52 #include "oops/resolvedMethodEntry.hpp"
53 #include "prims/methodHandles.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/atomic.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/mutexLocker.hpp"
58 #include "runtime/vm_version.hpp"
59 #include "utilities/macros.hpp"
60
61 // Implementation of ConstantPoolCache
62
63 template <class T>
64 static Array<T>* initialize_resolved_entries_array(ClassLoaderData* loader_data, GrowableArray<T> entries, TRAPS) {
65 Array<T>* resolved_entries;
66 if (entries.length() != 0) {
67 resolved_entries = MetadataFactory::new_array<T>(loader_data, entries.length(), CHECK_NULL);
68 for (int i = 0; i < entries.length(); i++) {
69 resolved_entries->at_put(i, entries.at(i));
70 }
71 return resolved_entries;
72 }
73 return nullptr;
74 }
75
76 void ConstantPoolCache::set_direct_or_vtable_call(Bytecodes::Code invoke_code,
77 int method_index,
78 const methodHandle& method,
79 int vtable_index,
80 bool sender_is_interface) {
81 bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean
82 assert(method->interpreter_entry() != nullptr, "should have been set at this point");
83 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
84
85 int byte_no = -1;
86 bool change_to_virtual = false;
87 InstanceKlass* holder = nullptr; // have to declare this outside the switch
88 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
89 switch (invoke_code) {
90 case Bytecodes::_invokeinterface:
91 holder = method->method_holder();
92 // check for private interface method invocations
93 if (vtable_index == Method::nonvirtual_vtable_index && holder->is_interface() ) {
94 assert(method->is_private(), "unexpected non-private method");
95 assert(method->can_be_statically_bound(), "unexpected non-statically-bound method");
96
97 method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) |
98 ((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift));
99 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
100 assert(method_entry->is_vfinal(), "flags must be set");
101 method_entry->set_method(method());
102 byte_no = 2;
103 method_entry->set_klass(holder);
104 break;
105 }
106 else {
107 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface
108 // instruction links to a non-interface method (in Object). This can happen when
109 // an interface redeclares an Object method (like CharSequence declaring toString())
110 // or when invokeinterface is used explicitly.
111 // In that case, the method has no itable index and must be invoked as a virtual.
112 // Set a flag to keep track of this corner case.
113 assert(holder->is_interface() || holder == vmClasses::Object_klass(), "unexpected holder class");
114 assert(method->is_public(), "Calling non-public method in Object with invokeinterface");
115 change_to_virtual = true;
116
117 // ...and fall through as if we were handling invokevirtual:
118 }
119 case Bytecodes::_invokevirtual:
120 {
121 if (!is_vtable_call) {
122 assert(method->can_be_statically_bound(), "");
123 method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) |
124 ((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift) |
125 ((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift));
126 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
127 assert(method_entry->is_vfinal(), "flags must be set");
128 method_entry->set_method(method());
129 } else {
130 assert(!method->can_be_statically_bound(), "");
131 assert(vtable_index >= 0, "valid index");
132 assert(!method->is_final_method(), "sanity");
133 method_entry->set_flags((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift);
134 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
135 assert(!method_entry->is_vfinal(), "flags must not be set");
136 method_entry->set_table_index(vtable_index);
137 }
138 byte_no = 2;
139 break;
140 }
141
142 case Bytecodes::_invokespecial:
143 case Bytecodes::_invokestatic: {
144 assert(!is_vtable_call, "");
145 // Note: Read and preserve the value of the is_vfinal flag on any
146 // invokevirtual bytecode shared with this constant pool cache entry.
147 // It is cheap and safe to consult is_vfinal() at all times.
148 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
149 bool vfinal = method_entry->is_vfinal();
150 method_entry->set_flags(((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift));
151 assert(vfinal == method_entry->is_vfinal(), "Vfinal flag must be preserved");
152 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
153 method_entry->set_method(method());
154 byte_no = 1;
155 break;
156 }
157 default:
158 ShouldNotReachHere();
159 break;
160 }
161
162 // Note: byte_no also appears in TemplateTable::resolve.
163 if (byte_no == 1) {
164 assert(invoke_code != Bytecodes::_invokevirtual &&
165 invoke_code != Bytecodes::_invokeinterface, "");
166 bool do_resolve = true;
167 // Don't mark invokespecial to method as resolved if sender is an interface. The receiver
168 // has to be checked that it is a subclass of the current class every time this bytecode
169 // is executed.
170 if (invoke_code == Bytecodes::_invokespecial && sender_is_interface &&
171 method->name() != vmSymbols::object_initializer_name()) {
172 do_resolve = false;
173 }
174 if (invoke_code == Bytecodes::_invokestatic) {
175 assert(method->method_holder()->is_initialized() ||
176 method->method_holder()->is_init_thread(JavaThread::current()),
177 "invalid class initialization state for invoke_static");
178
179 if (!VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
180 // Don't mark invokestatic to method as resolved if the holder class has not yet completed
181 // initialization. An invokestatic must only proceed if the class is initialized, but if
182 // we resolve it before then that class initialization check is skipped.
183 //
184 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
185 // template interpreter supports fast class initialization check for
186 // invokestatic which doesn't require call site re-resolution to
187 // enforce class initialization barrier.
188 do_resolve = false;
189 }
190 }
191 if (do_resolve) {
192 method_entry->set_bytecode1(invoke_code);
193 }
194 } else if (byte_no == 2) {
195 if (change_to_virtual) {
196 assert(invoke_code == Bytecodes::_invokeinterface, "");
197 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!!
198 //
199 // Workaround for the case where we encounter an invokeinterface, but we
200 // should really have an _invokevirtual since the resolved method is a
201 // virtual method in java.lang.Object. This is a corner case in the spec
202 // but is presumably legal. javac does not generate this code.
203 //
204 // We do not set bytecode_1() to _invokeinterface, because that is the
205 // bytecode # used by the interpreter to see if it is resolved. In this
206 // case, the method gets reresolved with caller for each interface call
207 // because the actual selected method may not be public.
208 //
209 // We set bytecode_2() to _invokevirtual.
210 // See also interpreterRuntime.cpp. (8/25/2000)
211 invoke_code = Bytecodes::_invokevirtual;
212 } else {
213 assert(invoke_code == Bytecodes::_invokevirtual ||
214 (invoke_code == Bytecodes::_invokeinterface &&
215 ((method->is_private() ||
216 (method->is_final() && method->method_holder() == vmClasses::Object_klass())))),
217 "unexpected invocation mode");
218 if (invoke_code == Bytecodes::_invokeinterface &&
219 (method->is_private() || method->is_final())) {
220 // We set bytecode_1() to _invokeinterface, because that is the
221 // bytecode # used by the interpreter to see if it is resolved.
222 // We set bytecode_2() to _invokevirtual.
223 method_entry->set_bytecode1(invoke_code);
224 }
225 }
226 // set up for invokevirtual, even if linking for invokeinterface also:
227 method_entry->set_bytecode2(invoke_code);
228 } else {
229 ShouldNotReachHere();
230 }
231 }
232
233 void ConstantPoolCache::set_direct_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method,
234 bool sender_is_interface) {
235 int index = Method::nonvirtual_vtable_index;
236 // index < 0; FIXME: inline and customize set_direct_or_vtable_call
237 set_direct_or_vtable_call(invoke_code, method_index, method, index, sender_is_interface);
238 }
239
240 void ConstantPoolCache::set_vtable_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method, int index) {
241 // either the method is a miranda or its holder should accept the given index
242 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), "");
243 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call
244 set_direct_or_vtable_call(invoke_code, method_index, method, index, false);
245 }
246
247 void ConstantPoolCache::set_itable_call(Bytecodes::Code invoke_code,
248 int method_index,
249 Klass* referenced_klass,
250 const methodHandle& method, int index) {
251 assert(method->method_holder()->verify_itable_index(index), "");
252 assert(invoke_code == Bytecodes::_invokeinterface, "");
253 InstanceKlass* interf = method->method_holder();
254 assert(interf->is_interface(), "must be an interface");
255 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here");
256 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
257 method_entry->set_klass(static_cast<InstanceKlass*>(referenced_klass));
258 method_entry->set_method(method());
259 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
260 method_entry->set_bytecode1(Bytecodes::_invokeinterface);
261 }
262
263 ResolvedMethodEntry* ConstantPoolCache::set_method_handle(int method_index, const CallInfo &call_info) {
264 // NOTE: This method entry can be the subject of data races.
265 // There are three words to update: flags, refs[appendix_index], method (in that order).
266 // Writers must store all other values before method.
267 // Readers must test the method first for non-null before reading other fields.
268 // Competing writers must acquire exclusive access via a lock.
269 // A losing writer waits on the lock until the winner writes the method and leaves
270 // the lock, so that when the losing writer returns, he can use the linked
271 // cache entry.
272 // Lock fields to write
273 Bytecodes::Code invoke_code = Bytecodes::_invokehandle;
274 MutexLocker ml(constant_pool()->pool_holder()->init_monitor());
275 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
276
277 if (method_entry->is_resolved(invoke_code)) {
278 return method_entry;
279 }
280
281 Method* adapter = call_info.resolved_method();
282 const Handle appendix = call_info.resolved_appendix();
283 const bool has_appendix = appendix.not_null();
284
285 // Write the flags.
286 // MHs are always sig-poly and have a local signature.
287 method_entry->fill_in((u1)as_TosState(adapter->result_type()), (u2)adapter->size_of_parameters());
288 method_entry->set_flags(((has_appendix ? 1 : 0) << ResolvedMethodEntry::has_appendix_shift ) |
289 ( 1 << ResolvedMethodEntry::has_local_signature_shift ) |
290 ( 1 << ResolvedMethodEntry::is_final_shift ));
291
292 // Method handle invokes use both a method and a resolved references index.
293 // refs[appendix_index], if not null, contains a value passed as a trailing argument to the adapter.
294 // In the general case, this could be the call site's MethodType,
295 // for use with java.lang.Invokers.checkExactType, or else a CallSite object.
296 // method_entry->method() contains the adapter method which manages the actual call.
297 // In the general case, this is a compiled LambdaForm.
298 // (The Java code is free to optimize these calls by binding other
299 // sorts of methods and appendices to call sites.)
300 // JVM-level linking is via the method, as if for invokespecial, and signatures are erased.
301 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits.
302 // Even with the appendix, the method will never take more than 255 parameter slots.
303 //
304 // This means that given a call site like (List)mh.invoke("foo"),
305 // the method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;',
306 // not '(Ljava/lang/String;)Ljava/util/List;'.
307 // The fact that String and List are involved is encoded in the MethodType in refs[appendix_index].
308 // This allows us to create fewer Methods, while keeping type safety.
309 //
310
311 // Store appendix, if any.
312 if (has_appendix) {
313 const int appendix_index = method_entry->resolved_references_index();
314 objArrayOop resolved_references = constant_pool()->resolved_references();
315 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
316 assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
317 resolved_references->obj_at_put(appendix_index, appendix());
318 }
319
320 method_entry->set_method(adapter); // This must be the last one to set (see NOTE above)!
321
322 // The interpreter assembly code does not check byte_2,
323 // but it is used by is_resolved, method_if_resolved, etc.
324 method_entry->set_bytecode1(invoke_code);
325
326 assert(has_appendix == method_entry->has_appendix(), "proper storage of appendix flag");
327 assert(method_entry->has_local_signature(), "proper storage of signature flag");
328 return method_entry;
329 }
330
331 Method* ConstantPoolCache::method_if_resolved(int method_index) const {
332 // Decode the action of set_method and set_interface_call
333 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
334
335 Bytecodes::Code invoke_code = (Bytecodes::Code)method_entry->bytecode1();
336 switch (invoke_code) {
337 case Bytecodes::_invokeinterface:
338 case Bytecodes::_invokestatic:
339 case Bytecodes::_invokespecial:
340 assert(!method_entry->has_appendix(), "");
341 // fall through
342 case Bytecodes::_invokehandle:
343 return method_entry->method();
344 case Bytecodes::_invokedynamic:
345 ShouldNotReachHere();
346 default:
347 assert(invoke_code == (Bytecodes::Code)0, "unexpected bytecode");
348 break;
349 }
350
351 invoke_code = (Bytecodes::Code)method_entry->bytecode2();
352 if (invoke_code == Bytecodes::_invokevirtual) {
353 if (method_entry->is_vfinal()) {
354 return method_entry->method();
355 } else {
356 int holder_index = constant_pool()->uncached_klass_ref_index_at(method_entry->constant_pool_index());
357 if (constant_pool()->tag_at(holder_index).is_klass()) {
358 Klass* klass = constant_pool()->resolved_klass_at(holder_index);
359 return klass->method_at_vtable(method_entry->table_index());
360 }
361 }
362 }
363 return nullptr;
364 }
365
366 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data,
367 const intStack& invokedynamic_map,
368 const GrowableArray<ResolvedIndyEntry> indy_entries,
369 const GrowableArray<ResolvedFieldEntry> field_entries,
370 const GrowableArray<ResolvedMethodEntry> method_entries,
371 TRAPS) {
372
373 int size = ConstantPoolCache::size();
374
375 // Initialize resolved entry arrays with available data
376 Array<ResolvedFieldEntry>* resolved_field_entries = initialize_resolved_entries_array(loader_data, field_entries, CHECK_NULL);
377 Array<ResolvedIndyEntry>* resolved_indy_entries = initialize_resolved_entries_array(loader_data, indy_entries, CHECK_NULL);
378 Array<ResolvedMethodEntry>* resolved_method_entries = initialize_resolved_entries_array(loader_data, method_entries, CHECK_NULL);
379
380 return new (loader_data, size, MetaspaceObj::ConstantPoolCacheType, THREAD)
381 ConstantPoolCache(invokedynamic_map, resolved_indy_entries, resolved_field_entries, resolved_method_entries);
382 }
383
384 // Record the GC marking cycle when redefined vs. when found in the loom stack chunks.
385 void ConstantPoolCache::record_gc_epoch() {
386 _gc_epoch = CodeCache::gc_epoch();
387 }
388
389 #if INCLUDE_CDS
390 void ConstantPoolCache::remove_unshareable_info() {
391 assert(CDSConfig::is_dumping_archive(), "sanity");
392 // <this> is the copy to be written into the archive. It's in the ArchiveBuilder's "buffer space".
393 // However, this->_initial_entries was not copied/relocated by the ArchiveBuilder, so it's
394 // still pointing to the array allocated inside save_for_archive().
395 if (_resolved_indy_entries != nullptr) {
396 for (int i = 0; i < _resolved_indy_entries->length(); i++) {
397 resolved_indy_entry_at(i)->remove_unshareable_info();
398 }
399 }
400 if (_resolved_field_entries != nullptr) {
401 for (int i = 0; i < _resolved_field_entries->length(); i++) {
402 resolved_field_entry_at(i)->remove_unshareable_info();
403 }
404 }
405 if (_resolved_method_entries != nullptr) {
406 for (int i = 0; i < _resolved_method_entries->length(); i++) {
407 resolved_method_entry_at(i)->remove_unshareable_info();
408 }
409 }
410 }
411 #endif // INCLUDE_CDS
412
413 void ConstantPoolCache::deallocate_contents(ClassLoaderData* data) {
414 assert(!is_shared(), "shared caches are not deallocated");
415 data->remove_handle(_resolved_references);
416 set_resolved_references(OopHandle());
417 MetadataFactory::free_array<u2>(data, _reference_map);
418 set_reference_map(nullptr);
419 #if INCLUDE_CDS
420 if (_resolved_indy_entries != nullptr) {
421 MetadataFactory::free_array<ResolvedIndyEntry>(data, _resolved_indy_entries);
422 _resolved_indy_entries = nullptr;
423 }
424 if (_resolved_field_entries != nullptr) {
425 MetadataFactory::free_array<ResolvedFieldEntry>(data, _resolved_field_entries);
426 _resolved_field_entries = nullptr;
427 }
428 if (_resolved_method_entries != nullptr) {
429 MetadataFactory::free_array<ResolvedMethodEntry>(data, _resolved_method_entries);
430 _resolved_method_entries = nullptr;
431 }
432 #endif
433 }
434
435 #if INCLUDE_CDS_JAVA_HEAP
436 oop ConstantPoolCache::archived_references() {
437 if (_archived_references_index < 0) {
438 return nullptr;
439 }
440 return HeapShared::get_root(_archived_references_index);
441 }
442
443 void ConstantPoolCache::clear_archived_references() {
444 if (_archived_references_index >= 0) {
445 HeapShared::clear_root(_archived_references_index);
446 _archived_references_index = -1;
447 }
448 }
449
450 void ConstantPoolCache::set_archived_references(int root_index) {
451 assert(CDSConfig::is_dumping_heap(), "sanity");
452 _archived_references_index = root_index;
453 }
454 #endif
455
456 #if INCLUDE_JVMTI
457 void log_adjust(const char* entry_type, Method* old_method, Method* new_method, bool* trace_name_printed) {
458 ResourceMark rm;
459
460 if (!(*trace_name_printed)) {
461 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
462 *trace_name_printed = true;
463 }
464 log_trace(redefine, class, update, constantpool)
465 ("cpc %s entry update: %s", entry_type, new_method->external_name());
466 }
467
468 // RedefineClasses() API support:
469 // If any entry of this ConstantPoolCache points to any of
470 // old_methods, replace it with the corresponding new_method.
471 void ConstantPoolCache::adjust_method_entries(bool * trace_name_printed) {
472 if (_resolved_indy_entries != nullptr) {
473 for (int j = 0; j < _resolved_indy_entries->length(); j++) {
474 Method* old_method = resolved_indy_entry_at(j)->method();
475 if (old_method == nullptr || !old_method->is_old()) {
476 continue;
477 }
478 Method* new_method = old_method->get_new_method();
479 resolved_indy_entry_at(j)->adjust_method_entry(new_method);
480 log_adjust("indy", old_method, new_method, trace_name_printed);
481 }
482 }
483 if (_resolved_method_entries != nullptr) {
484 for (int i = 0; i < _resolved_method_entries->length(); i++) {
485 ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
486 // get interesting method entry
487 Method* old_method = method_entry->method();
488 if (old_method == nullptr || !old_method->is_old()) {
489 continue; // skip uninteresting entries
490 }
491 if (old_method->is_deleted()) {
492 // clean up entries with deleted methods
493 method_entry->reset_entry();
494 continue;
495 }
496 Method* new_method = old_method->get_new_method();
497 method_entry->adjust_method_entry(new_method);
498 log_adjust("non-indy", old_method, new_method, trace_name_printed);
499 }
500 }
501 }
502
503 // the constant pool cache should never contain old or obsolete methods
504 bool ConstantPoolCache::check_no_old_or_obsolete_entries() {
505 ResourceMark rm;
506 if (_resolved_indy_entries != nullptr) {
507 for (int i = 0; i < _resolved_indy_entries->length(); i++) {
508 Method* m = resolved_indy_entry_at(i)->method();
509 if (m != nullptr && !resolved_indy_entry_at(i)->check_no_old_or_obsolete_entry()) {
510 log_trace(redefine, class, update, constantpool)
511 ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
512 constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
513 return false;
514 }
515 }
516 }
517 if (_resolved_method_entries != nullptr) {
518 for (int i = 0; i < _resolved_method_entries->length(); i++) {
519 ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
520 Method* m = method_entry->method();
521 if (m != nullptr && !method_entry->check_no_old_or_obsolete_entry()) {
522 log_trace(redefine, class, update, constantpool)
523 ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
524 constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
525 return false;
526 }
527 }
528 }
529 return true;
530 }
531
532 void ConstantPoolCache::dump_cache() {
533 print_on(tty);
534 }
535 #endif // INCLUDE_JVMTI
536
537 void ConstantPoolCache::metaspace_pointers_do(MetaspaceClosure* it) {
538 log_trace(cds)("Iter(ConstantPoolCache): %p", this);
539 it->push(&_constant_pool);
540 it->push(&_reference_map);
541 if (_resolved_indy_entries != nullptr) {
542 it->push(&_resolved_indy_entries, MetaspaceClosure::_writable);
543 }
544 if (_resolved_field_entries != nullptr) {
545 it->push(&_resolved_field_entries, MetaspaceClosure::_writable);
546 }
547 if (_resolved_method_entries != nullptr) {
548 it->push(&_resolved_method_entries, MetaspaceClosure::_writable);
549 }
550 }
551
552 bool ConstantPoolCache::save_and_throw_indy_exc(
553 const constantPoolHandle& cpool, int cpool_index, int index, constantTag tag, TRAPS) {
554
555 assert(HAS_PENDING_EXCEPTION, "No exception got thrown!");
556 assert(PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass()),
557 "No LinkageError exception");
558
559 MutexLocker ml(THREAD, cpool->pool_holder()->init_monitor());
560
561 // if the indy_info is resolved or the indy_resolution_failed flag is set then another
562 // thread either succeeded in resolving the method or got a LinkageError
563 // exception, before this thread was able to record its failure. So, clear
564 // this thread's exception and return false so caller can use the earlier
565 // thread's result.
566 if (resolved_indy_entry_at(index)->is_resolved() || resolved_indy_entry_at(index)->resolution_failed()) {
567 CLEAR_PENDING_EXCEPTION;
568 return false;
569 }
570
571 Symbol* error = PENDING_EXCEPTION->klass()->name();
572 Symbol* message = java_lang_Throwable::detail_message(PENDING_EXCEPTION);
573
574 int encoded_index = ResolutionErrorTable::encode_indy_index(
575 ConstantPool::encode_invokedynamic_index(index));
576 SystemDictionary::add_resolution_error(cpool, encoded_index, error, message);
577 resolved_indy_entry_at(index)->set_resolution_failed();
578 return true;
579 }
580
581 oop ConstantPoolCache::set_dynamic_call(const CallInfo &call_info, int index) {
582 ResourceMark rm;
583 MutexLocker ml(constant_pool()->pool_holder()->init_monitor());
584 assert(index >= 0, "Indy index must be positive at this point");
585
586 if (resolved_indy_entry_at(index)->method() != nullptr) {
587 return constant_pool()->resolved_reference_from_indy(index);
588 }
589
590 if (resolved_indy_entry_at(index)->resolution_failed()) {
591 // Before we got here, another thread got a LinkageError exception during
592 // resolution. Ignore our success and throw their exception.
593 guarantee(index >= 0, "Invalid indy index");
594 int encoded_index = ResolutionErrorTable::encode_indy_index(
595 ConstantPool::encode_invokedynamic_index(index));
596 JavaThread* THREAD = JavaThread::current(); // For exception macros.
597 constantPoolHandle cp(THREAD, constant_pool());
598 ConstantPool::throw_resolution_error(cp, encoded_index, THREAD);
599 return nullptr;
600 }
601
602 Method* adapter = call_info.resolved_method();
603 const Handle appendix = call_info.resolved_appendix();
604 const bool has_appendix = appendix.not_null();
605
606 LogStream* log_stream = nullptr;
607 LogStreamHandle(Debug, methodhandles, indy) lsh_indy;
608 if (lsh_indy.is_enabled()) {
609 ResourceMark rm;
610 log_stream = &lsh_indy;
611 log_stream->print_cr("set_method_handle bc=%d appendix=" PTR_FORMAT "%s method=" PTR_FORMAT " (local signature) ",
612 0xba,
613 p2i(appendix()),
614 (has_appendix ? "" : " (unused)"),
615 p2i(adapter));
616 adapter->print_on(log_stream);
617 if (has_appendix) appendix()->print_on(log_stream);
618 }
619
620 if (has_appendix) {
621 const int appendix_index = resolved_indy_entry_at(index)->resolved_references_index();
622 objArrayOop resolved_references = constant_pool()->resolved_references();
623 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
624 assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
625 resolved_references->obj_at_put(appendix_index, appendix());
626 }
627
628 // Populate entry with resolved information
629 assert(resolved_indy_entries() != nullptr, "Invokedynamic array is empty, cannot fill with resolved information");
630 resolved_indy_entry_at(index)->fill_in(adapter, adapter->size_of_parameters(), as_TosState(adapter->result_type()), has_appendix);
631
632 if (log_stream != nullptr) {
633 resolved_indy_entry_at(index)->print_on(log_stream);
634 }
635 return appendix();
636 }
637
638 oop ConstantPoolCache::appendix_if_resolved(int method_index) const {
639 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
640 return appendix_if_resolved(method_entry);
641 }
642
643 oop ConstantPoolCache::appendix_if_resolved(ResolvedMethodEntry* method_entry) const {
644 if (!method_entry->has_appendix())
645 return nullptr;
646 const int ref_index = method_entry->resolved_references_index();
647 return constant_pool()->resolved_reference_at(ref_index);
648 }
649
650 // Printing
651
652 void ConstantPoolCache::print_on(outputStream* st) const {
653 st->print_cr("%s", internal_name());
654 // print constant pool cache entries
655 print_resolved_field_entries(st);
656 print_resolved_method_entries(st);
657 print_resolved_indy_entries(st);
658 }
659
660 void ConstantPoolCache::print_resolved_field_entries(outputStream* st) const {
661 for (int field_index = 0; field_index < resolved_field_entries_length(); field_index++) {
662 resolved_field_entry_at(field_index)->print_on(st);
663 }
664 }
665
666 void ConstantPoolCache::print_resolved_method_entries(outputStream* st) const {
667 for (int method_index = 0; method_index < resolved_method_entries_length(); method_index++) {
668 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
669 method_entry->print_on(st);
670 if (method_entry->has_appendix()) {
671 st->print(" appendix: ");
672 constant_pool()->resolved_reference_from_method(method_index)->print_on(st);
673 }
674 }
675 }
676
677 void ConstantPoolCache::print_resolved_indy_entries(outputStream* st) const {
678 for (int indy_index = 0; indy_index < resolved_indy_entries_length(); indy_index++) {
679 ResolvedIndyEntry* indy_entry = resolved_indy_entry_at(indy_index);
680 indy_entry->print_on(st);
681 if (indy_entry->has_appendix()) {
682 st->print(" appendix: ");
683 constant_pool()->resolved_reference_from_indy(indy_index)->print_on(st);
684 }
685 }
686 }