1 /*
2 * Copyright (c) 1998, 2024, 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/cdsConfig.hpp"
27 #include "cds/heapShared.hpp"
28 #include "classfile/resolutionErrors.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/systemDictionaryShared.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "code/codeCache.hpp"
33 #include "interpreter/bytecodeStream.hpp"
34 #include "interpreter/bytecodes.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "interpreter/linkResolver.hpp"
37 #include "interpreter/rewriter.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/metadataFactory.hpp"
41 #include "memory/metaspaceClosure.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/access.inline.hpp"
44 #include "oops/compressedOops.hpp"
45 #include "oops/constantPool.inline.hpp"
46 #include "oops/cpCache.inline.hpp"
47 #include "oops/objArrayOop.inline.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "oops/resolvedFieldEntry.hpp"
50 #include "oops/resolvedIndyEntry.hpp"
51 #include "oops/resolvedMethodEntry.hpp"
52 #include "prims/methodHandles.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/atomic.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/mutexLocker.hpp"
57 #include "runtime/vm_version.hpp"
58 #include "utilities/macros.hpp"
59
60 // Implementation of ConstantPoolCache
61
62 template <class T>
63 static Array<T>* initialize_resolved_entries_array(ClassLoaderData* loader_data, GrowableArray<T> entries, TRAPS) {
64 Array<T>* resolved_entries;
65 if (entries.length() != 0) {
66 resolved_entries = MetadataFactory::new_array<T>(loader_data, entries.length(), CHECK_NULL);
67 for (int i = 0; i < entries.length(); i++) {
68 resolved_entries->at_put(i, entries.at(i));
69 }
70 return resolved_entries;
71 }
72 return nullptr;
73 }
74
75 void ConstantPoolCache::set_direct_or_vtable_call(Bytecodes::Code invoke_code,
76 int method_index,
77 const methodHandle& method,
78 int vtable_index,
79 bool sender_is_interface) {
80 bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean
81 assert(method->interpreter_entry() != nullptr, "should have been set at this point");
82 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
83
84 int byte_no = -1;
85 bool change_to_virtual = false;
86 InstanceKlass* holder = nullptr; // have to declare this outside the switch
87 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
88 switch (invoke_code) {
89 case Bytecodes::_invokeinterface:
90 holder = method->method_holder();
91 // check for private interface method invocations
92 if (vtable_index == Method::nonvirtual_vtable_index && holder->is_interface() ) {
93 assert(method->is_private(), "unexpected non-private method");
94 assert(method->can_be_statically_bound(), "unexpected non-statically-bound method");
95
96 method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) |
97 ((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift));
98 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
99 assert(method_entry->is_vfinal(), "flags must be set");
100 method_entry->set_method(method());
101 byte_no = 2;
102 method_entry->set_klass(holder);
103 break;
104 }
105 else {
106 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface
107 // instruction links to a non-interface method (in Object). This can happen when
108 // an interface redeclares an Object method (like CharSequence declaring toString())
109 // or when invokeinterface is used explicitly.
110 // In that case, the method has no itable index and must be invoked as a virtual.
111 // Set a flag to keep track of this corner case.
112 assert(holder->is_interface() || holder == vmClasses::Object_klass(), "unexpected holder class");
113 assert(method->is_public(), "Calling non-public method in Object with invokeinterface");
114 change_to_virtual = true;
115
116 // ...and fall through as if we were handling invokevirtual:
117 }
118 case Bytecodes::_invokevirtual:
119 {
120 if (!is_vtable_call) {
121 assert(method->can_be_statically_bound(), "");
122 method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) |
123 ((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift) |
124 ((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift));
125 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
126 assert(method_entry->is_vfinal(), "flags must be set");
127 method_entry->set_method(method());
128 } else {
129 assert(!method->can_be_statically_bound(), "");
130 assert(vtable_index >= 0, "valid index");
131 assert(!method->is_final_method(), "sanity");
132 method_entry->set_flags((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift);
133 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
134 assert(!method_entry->is_vfinal(), "flags must not be set");
135 method_entry->set_table_index(vtable_index);
136 }
137 byte_no = 2;
138 break;
139 }
140
141 case Bytecodes::_invokespecial:
142 case Bytecodes::_invokestatic: {
143 assert(!is_vtable_call, "");
144 // Note: Read and preserve the value of the is_vfinal flag on any
145 // invokevirtual bytecode shared with this constant pool cache entry.
146 // It is cheap and safe to consult is_vfinal() at all times.
147 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
148 bool vfinal = method_entry->is_vfinal();
149 method_entry->set_flags(((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift));
150 assert(vfinal == method_entry->is_vfinal(), "Vfinal flag must be preserved");
151 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
152 method_entry->set_method(method());
153 byte_no = 1;
154 break;
155 }
156 default:
157 ShouldNotReachHere();
158 break;
159 }
160
161 // Note: byte_no also appears in TemplateTable::resolve.
162 if (byte_no == 1) {
163 assert(invoke_code != Bytecodes::_invokevirtual &&
164 invoke_code != Bytecodes::_invokeinterface, "");
165 bool do_resolve = true;
166 // Don't mark invokespecial to method as resolved if sender is an interface. The receiver
167 // has to be checked that it is a subclass of the current class every time this bytecode
168 // is executed.
169 if (invoke_code == Bytecodes::_invokespecial && sender_is_interface &&
170 method->name() != vmSymbols::object_initializer_name()) {
171 do_resolve = false;
172 }
173 if (invoke_code == Bytecodes::_invokestatic) {
174 assert(method->method_holder()->is_initialized() ||
175 method->method_holder()->is_init_thread(JavaThread::current()) ||
176 (CDSConfig::is_dumping_archive() && VM_Version::supports_fast_class_init_checks()),
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 } else {
212 assert(invoke_code == Bytecodes::_invokevirtual ||
213 (invoke_code == Bytecodes::_invokeinterface &&
214 ((method->is_private() ||
215 (method->is_final() && method->method_holder() == vmClasses::Object_klass())))),
216 "unexpected invocation mode");
217 if (invoke_code == Bytecodes::_invokeinterface &&
218 (method->is_private() || method->is_final())) {
219 // We set bytecode_1() to _invokeinterface, because that is the
220 // bytecode # used by the interpreter to see if it is resolved.
221 // We set bytecode_2() to _invokevirtual.
222 method_entry->set_bytecode1(invoke_code);
223 }
224 }
225 // set up for invokevirtual, even if linking for invokeinterface also:
226 method_entry->set_bytecode2(Bytecodes::_invokevirtual);
227 } else {
228 ShouldNotReachHere();
229 }
230 }
231
232 void ConstantPoolCache::set_direct_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method,
233 bool sender_is_interface) {
234 int index = Method::nonvirtual_vtable_index;
235 // index < 0; FIXME: inline and customize set_direct_or_vtable_call
236 set_direct_or_vtable_call(invoke_code, method_index, method, index, sender_is_interface);
237 }
238
239 void ConstantPoolCache::set_vtable_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method, int index) {
240 // either the method is a miranda or its holder should accept the given index
241 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), "");
242 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call
243 set_direct_or_vtable_call(invoke_code, method_index, method, index, false);
244 }
245
246 void ConstantPoolCache::set_itable_call(Bytecodes::Code invoke_code,
247 int method_index,
248 Klass* referenced_klass,
249 const methodHandle& method, int index) {
250 assert(method->method_holder()->verify_itable_index(index), "");
251 assert(invoke_code == Bytecodes::_invokeinterface, "");
252 InstanceKlass* interf = method->method_holder();
253 assert(interf->is_interface(), "must be an interface");
254 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here");
255 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
256 method_entry->set_klass(static_cast<InstanceKlass*>(referenced_klass));
257 method_entry->set_method(method());
258 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
259 method_entry->set_bytecode1(Bytecodes::_invokeinterface);
260 }
261
262 ResolvedMethodEntry* ConstantPoolCache::set_method_handle(int method_index, const CallInfo &call_info) {
263 // NOTE: This method entry can be the subject of data races.
264 // There are three words to update: flags, refs[appendix_index], method (in that order).
265 // Writers must store all other values before method.
266 // Readers must test the method first for non-null before reading other fields.
267 // Competing writers must acquire exclusive access via a lock.
268 // A losing writer waits on the lock until the winner writes the method and leaves
269 // the lock, so that when the losing writer returns, he can use the linked
270 // cache entry.
271 // Lock fields to write
272 Bytecodes::Code invoke_code = Bytecodes::_invokehandle;
273 MutexLocker ml(constant_pool()->pool_holder()->init_monitor());
274 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
275
276 if (method_entry->is_resolved(invoke_code)) {
277 return method_entry;
278 }
279
280 Method* adapter = call_info.resolved_method();
281 const Handle appendix = call_info.resolved_appendix();
282 const bool has_appendix = appendix.not_null();
283
284 // Write the flags.
285 // MHs are always sig-poly and have a local signature.
286 method_entry->fill_in((u1)as_TosState(adapter->result_type()), (u2)adapter->size_of_parameters());
287 method_entry->set_flags(((has_appendix ? 1 : 0) << ResolvedMethodEntry::has_appendix_shift ) |
288 ( 1 << ResolvedMethodEntry::has_local_signature_shift ) |
289 ( 1 << ResolvedMethodEntry::is_final_shift ));
290
291 // Method handle invokes use both a method and a resolved references index.
292 // refs[appendix_index], if not null, contains a value passed as a trailing argument to the adapter.
293 // In the general case, this could be the call site's MethodType,
294 // for use with java.lang.Invokers.checkExactType, or else a CallSite object.
295 // method_entry->method() contains the adapter method which manages the actual call.
296 // In the general case, this is a compiled LambdaForm.
297 // (The Java code is free to optimize these calls by binding other
298 // sorts of methods and appendices to call sites.)
299 // JVM-level linking is via the method, as if for invokespecial, and signatures are erased.
300 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits.
301 // Even with the appendix, the method will never take more than 255 parameter slots.
302 //
303 // This means that given a call site like (List)mh.invoke("foo"),
304 // the method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;',
305 // not '(Ljava/lang/String;)Ljava/util/List;'.
306 // The fact that String and List are involved is encoded in the MethodType in refs[appendix_index].
307 // This allows us to create fewer Methods, while keeping type safety.
308 //
309
310 // Store appendix, if any.
311 if (has_appendix) {
312 const int appendix_index = method_entry->resolved_references_index();
313 objArrayOop resolved_references = constant_pool()->resolved_references();
314 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
315 assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
316 resolved_references->obj_at_put(appendix_index, appendix());
317 }
318
319 method_entry->set_method(adapter); // This must be the last one to set (see NOTE above)!
320
321 // The interpreter assembly code does not check byte_2,
322 // but it is used by is_resolved, method_if_resolved, etc.
323 method_entry->set_bytecode1(invoke_code);
324
325 assert(has_appendix == method_entry->has_appendix(), "proper storage of appendix flag");
326 assert(method_entry->has_local_signature(), "proper storage of signature flag");
327 return method_entry;
328 }
329
330 Method* ConstantPoolCache::method_if_resolved(int method_index) const {
331 // Decode the action of set_method and set_interface_call
332 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
333
334 Bytecodes::Code invoke_code = (Bytecodes::Code)method_entry->bytecode1();
335 switch (invoke_code) {
336 case Bytecodes::_invokeinterface:
337 case Bytecodes::_invokestatic:
338 case Bytecodes::_invokespecial:
339 assert(!method_entry->has_appendix(), "");
340 // fall through
341 case Bytecodes::_invokehandle:
342 return method_entry->method();
343 case Bytecodes::_invokedynamic:
344 ShouldNotReachHere();
345 default:
346 assert(invoke_code == (Bytecodes::Code)0, "unexpected bytecode");
347 break;
348 }
349
350 invoke_code = (Bytecodes::Code)method_entry->bytecode2();
351 if (invoke_code == Bytecodes::_invokevirtual) {
352 if (method_entry->is_vfinal()) {
353 return method_entry->method();
354 } else {
355 int holder_index = constant_pool()->uncached_klass_ref_index_at(method_entry->constant_pool_index());
356 if (constant_pool()->tag_at(holder_index).is_klass()) {
357 Klass* klass = constant_pool()->resolved_klass_at(holder_index);
358 return klass->method_at_vtable(method_entry->table_index());
359 }
360 }
361 }
362 return nullptr;
363 #if 0
364 else {
365 assert(is_field_entry(), "must be a field entry");
366 st->print_cr(" - F1: [ " PTR_FORMAT "]", (intptr_t)_f1);
367 st->print_cr(" - F2: [ " PTR_FORMAT "]", (intptr_t)_f2);
368 st->print_cr(" - flag values: [%02x|0|1|0|0|0|%01x|%01x|0|0|%04x]",
369 flag_state(), is_final(), is_volatile(), field_index());
370 st->print_cr(" - tos: %s\n - final: %d\n - volatile: %d\n - field index: %04x",
371 type2name(as_BasicType(flag_state())), is_final(), is_volatile(), field_index());
372 }
373 st->print_cr(" -------------");
374 #endif
375 }
376
377 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data,
378 const intStack& invokedynamic_map,
379 const GrowableArray<ResolvedIndyEntry> indy_entries,
380 const GrowableArray<ResolvedFieldEntry> field_entries,
381 const GrowableArray<ResolvedMethodEntry> method_entries,
382 TRAPS) {
383
384 int size = ConstantPoolCache::size();
385
386 // Initialize resolved entry arrays with available data
387 Array<ResolvedFieldEntry>* resolved_field_entries = initialize_resolved_entries_array(loader_data, field_entries, CHECK_NULL);
388 Array<ResolvedIndyEntry>* resolved_indy_entries = initialize_resolved_entries_array(loader_data, indy_entries, CHECK_NULL);
389 Array<ResolvedMethodEntry>* resolved_method_entries = initialize_resolved_entries_array(loader_data, method_entries, CHECK_NULL);
390
391 return new (loader_data, size, MetaspaceObj::ConstantPoolCacheType, THREAD)
392 ConstantPoolCache(invokedynamic_map, resolved_indy_entries, resolved_field_entries, resolved_method_entries);
393 }
394
395 // Record the GC marking cycle when redefined vs. when found in the loom stack chunks.
396 void ConstantPoolCache::record_gc_epoch() {
397 _gc_epoch = CodeCache::gc_epoch();
398 }
399
400 void ConstantPoolCache::deallocate_contents(ClassLoaderData* data) {
401 assert(!is_shared(), "shared caches are not deallocated");
402 data->remove_handle(_resolved_references);
403 set_resolved_references(OopHandle());
404 MetadataFactory::free_array<u2>(data, _reference_map);
405 set_reference_map(nullptr);
406 #if INCLUDE_CDS
407 if (_resolved_indy_entries != nullptr) {
408 MetadataFactory::free_array<ResolvedIndyEntry>(data, _resolved_indy_entries);
409 _resolved_indy_entries = nullptr;
410 }
411 if (_resolved_field_entries != nullptr) {
412 MetadataFactory::free_array<ResolvedFieldEntry>(data, _resolved_field_entries);
413 _resolved_field_entries = nullptr;
414 }
415 if (_resolved_method_entries != nullptr) {
416 MetadataFactory::free_array<ResolvedMethodEntry>(data, _resolved_method_entries);
417 _resolved_method_entries = nullptr;
418 }
419 #endif
420 }
421
422 #if INCLUDE_CDS_JAVA_HEAP
423 oop ConstantPoolCache::archived_references() {
424 if (_archived_references_index < 0) {
425 return nullptr;
426 }
427 return HeapShared::get_root(_archived_references_index);
428 }
429
430 void ConstantPoolCache::clear_archived_references() {
431 if (_archived_references_index >= 0) {
432 HeapShared::clear_root(_archived_references_index);
433 _archived_references_index = -1;
434 }
435 }
436
437 void ConstantPoolCache::set_archived_references(int root_index) {
438 assert(CDSConfig::is_dumping_heap(), "sanity");
439 _archived_references_index = root_index;
440 }
441 #endif
442
443 #if INCLUDE_JVMTI
444 static void log_adjust(const char* entry_type, Method* old_method, Method* new_method, bool* trace_name_printed) {
445 ResourceMark rm;
446
447 if (!(*trace_name_printed)) {
448 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
449 *trace_name_printed = true;
450 }
451 log_trace(redefine, class, update, constantpool)
452 ("cpc %s entry update: %s", entry_type, new_method->external_name());
453 }
454
455 // RedefineClasses() API support:
456 // If any entry of this ConstantPoolCache points to any of
457 // old_methods, replace it with the corresponding new_method.
458 void ConstantPoolCache::adjust_method_entries(bool * trace_name_printed) {
459 if (_resolved_indy_entries != nullptr) {
460 for (int j = 0; j < _resolved_indy_entries->length(); j++) {
461 Method* old_method = resolved_indy_entry_at(j)->method();
462 if (old_method == nullptr || !old_method->is_old()) {
463 continue;
464 }
465 Method* new_method = old_method->get_new_method();
466 resolved_indy_entry_at(j)->adjust_method_entry(new_method);
467 log_adjust("indy", old_method, new_method, trace_name_printed);
468 }
469 }
470 if (_resolved_method_entries != nullptr) {
471 for (int i = 0; i < _resolved_method_entries->length(); i++) {
472 ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
473 // get interesting method entry
474 Method* old_method = method_entry->method();
475 if (old_method == nullptr || !old_method->is_old()) {
476 continue; // skip uninteresting entries
477 }
478 if (old_method->is_deleted()) {
479 // clean up entries with deleted methods
480 method_entry->reset_entry();
481 continue;
482 }
483 Method* new_method = old_method->get_new_method();
484 method_entry->adjust_method_entry(new_method);
485 log_adjust("non-indy", old_method, new_method, trace_name_printed);
486 }
487 }
488 }
489
490 // the constant pool cache should never contain old or obsolete methods
491 bool ConstantPoolCache::check_no_old_or_obsolete_entries() {
492 ResourceMark rm;
493 if (_resolved_indy_entries != nullptr) {
494 for (int i = 0; i < _resolved_indy_entries->length(); i++) {
495 Method* m = resolved_indy_entry_at(i)->method();
496 if (m != nullptr && !resolved_indy_entry_at(i)->check_no_old_or_obsolete_entry()) {
497 log_trace(redefine, class, update, constantpool)
498 ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
499 constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
500 return false;
501 }
502 }
503 }
504 if (_resolved_method_entries != nullptr) {
505 for (int i = 0; i < _resolved_method_entries->length(); i++) {
506 ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
507 Method* m = method_entry->method();
508 if (m != nullptr && !method_entry->check_no_old_or_obsolete_entry()) {
509 log_trace(redefine, class, update, constantpool)
510 ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
511 constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
512 return false;
513 }
514 }
515 }
516 return true;
517 }
518
519 void ConstantPoolCache::dump_cache() {
520 print_on(tty);
521 }
522 #endif // INCLUDE_JVMTI
523
524 void ConstantPoolCache::metaspace_pointers_do(MetaspaceClosure* it) {
525 log_trace(cds)("Iter(ConstantPoolCache): %p", this);
526 it->push(&_constant_pool);
527 it->push(&_reference_map);
528 if (_resolved_indy_entries != nullptr) {
529 it->push(&_resolved_indy_entries, MetaspaceClosure::_writable);
530 }
531 if (_resolved_field_entries != nullptr) {
532 it->push(&_resolved_field_entries, MetaspaceClosure::_writable);
533 }
534 if (_resolved_method_entries != nullptr) {
535 it->push(&_resolved_method_entries, MetaspaceClosure::_writable);
536 }
537 }
538
539 bool ConstantPoolCache::save_and_throw_indy_exc(
540 const constantPoolHandle& cpool, int cpool_index, int index, constantTag tag, TRAPS) {
541
542 assert(HAS_PENDING_EXCEPTION, "No exception got thrown!");
543 assert(PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass()),
544 "No LinkageError exception");
545
546 MutexLocker ml(THREAD, cpool->pool_holder()->init_monitor());
547
548 // if the indy_info is resolved or the indy_resolution_failed flag is set then another
549 // thread either succeeded in resolving the method or got a LinkageError
550 // exception, before this thread was able to record its failure. So, clear
551 // this thread's exception and return false so caller can use the earlier
552 // thread's result.
553 if (resolved_indy_entry_at(index)->is_resolved() || resolved_indy_entry_at(index)->resolution_failed()) {
554 CLEAR_PENDING_EXCEPTION;
555 return false;
556 }
557 ResourceMark rm(THREAD);
558 Symbol* error = PENDING_EXCEPTION->klass()->name();
559 const char* message = java_lang_Throwable::message_as_utf8(PENDING_EXCEPTION);
560
561 int encoded_index = ResolutionErrorTable::encode_indy_index(index);
562 SystemDictionary::add_resolution_error(cpool, encoded_index, error, message);
563 resolved_indy_entry_at(index)->set_resolution_failed();
564 return true;
565 }
566
567 oop ConstantPoolCache::set_dynamic_call(const CallInfo &call_info, int index) {
568 ResourceMark rm;
569 MutexLocker ml(constant_pool()->pool_holder()->init_monitor());
570 assert(index >= 0, "Indy index must be positive at this point");
571
572 if (resolved_indy_entry_at(index)->method() != nullptr) {
573 return constant_pool()->resolved_reference_from_indy(index);
574 }
575
576 if (resolved_indy_entry_at(index)->resolution_failed()) {
577 // Before we got here, another thread got a LinkageError exception during
578 // resolution. Ignore our success and throw their exception.
579 guarantee(index >= 0, "Invalid indy index");
580 int encoded_index = ResolutionErrorTable::encode_indy_index(index);
581 JavaThread* THREAD = JavaThread::current(); // For exception macros.
582 constantPoolHandle cp(THREAD, constant_pool());
583 ConstantPool::throw_resolution_error(cp, encoded_index, THREAD);
584 return nullptr;
585 }
586
587 Method* adapter = call_info.resolved_method();
588 const Handle appendix = call_info.resolved_appendix();
589 const bool has_appendix = appendix.not_null();
590
591 LogStream* log_stream = nullptr;
592 LogStreamHandle(Debug, methodhandles, indy) lsh_indy;
593 if (lsh_indy.is_enabled()) {
594 ResourceMark rm;
595 log_stream = &lsh_indy;
596 log_stream->print_cr("set_method_handle bc=%d appendix=" PTR_FORMAT "%s method=" PTR_FORMAT " (local signature) ",
597 0xba,
598 p2i(appendix()),
599 (has_appendix ? "" : " (unused)"),
600 p2i(adapter));
601 adapter->print_on(log_stream);
602 if (has_appendix) appendix()->print_on(log_stream);
603 }
604
605 if (has_appendix) {
606 const int appendix_index = resolved_indy_entry_at(index)->resolved_references_index();
607 objArrayOop resolved_references = constant_pool()->resolved_references();
608 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
609 assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
610 resolved_references->obj_at_put(appendix_index, appendix());
611 }
612
613 // Populate entry with resolved information
614 assert(resolved_indy_entries() != nullptr, "Invokedynamic array is empty, cannot fill with resolved information");
615 resolved_indy_entry_at(index)->fill_in(adapter, adapter->size_of_parameters(), as_TosState(adapter->result_type()), has_appendix);
616
617 if (log_stream != nullptr) {
618 resolved_indy_entry_at(index)->print_on(log_stream);
619 }
620 return appendix();
621 }
622
623 oop ConstantPoolCache::appendix_if_resolved(int method_index) const {
624 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
625 return appendix_if_resolved(method_entry);
626 }
627
628 oop ConstantPoolCache::appendix_if_resolved(ResolvedMethodEntry* method_entry) const {
629 if (!method_entry->has_appendix())
630 return nullptr;
631 const int ref_index = method_entry->resolved_references_index();
632 return constant_pool()->resolved_reference_at(ref_index);
633 }
634
635 // Printing
636
637 void ConstantPoolCache::print_on(outputStream* st) const {
638 st->print_cr("%s", internal_name());
639 // print constant pool cache entries
640 print_resolved_field_entries(st);
641 print_resolved_method_entries(st);
642 print_resolved_indy_entries(st);
643 }
644
645 void ConstantPoolCache::print_resolved_field_entries(outputStream* st) const {
646 for (int field_index = 0; field_index < resolved_field_entries_length(); field_index++) {
647 resolved_field_entry_at(field_index)->print_on(st);
648 }
649 }
650
651 void ConstantPoolCache::print_resolved_method_entries(outputStream* st) const {
652 for (int method_index = 0; method_index < resolved_method_entries_length(); method_index++) {
653 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
654 method_entry->print_on(st);
655 if (method_entry->has_appendix()) {
656 st->print(" appendix: ");
657 constant_pool()->resolved_reference_from_method(method_index)->print_on(st);
658 }
659 }
660 }
661
662 void ConstantPoolCache::print_resolved_indy_entries(outputStream* st) const {
663 for (int indy_index = 0; indy_index < resolved_indy_entries_length(); indy_index++) {
664 ResolvedIndyEntry* indy_entry = resolved_indy_entry_at(indy_index);
665 indy_entry->print_on(st);
666 if (indy_entry->has_appendix()) {
667 st->print(" appendix: ");
668 constant_pool()->resolved_reference_from_indy(indy_index)->print_on(st);
669 }
670 }
671 }