1 /*
2 * Copyright (c) 1998, 2025, 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 "cds/aotConstantPoolResolver.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/method.inline.hpp"
49 #include "oops/objArrayOop.inline.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "oops/resolvedFieldEntry.hpp"
52 #include "oops/resolvedIndyEntry.hpp"
53 #include "oops/resolvedMethodEntry.hpp"
54 #include "prims/methodHandles.hpp"
55 #include "runtime/arguments.hpp"
56 #include "runtime/atomic.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/mutexLocker.hpp"
59 #include "runtime/synchronizer.hpp"
60 #include "runtime/vm_version.hpp"
61 #include "utilities/macros.hpp"
62
63 // Implementation of ConstantPoolCache
64
65 template <class T>
66 static Array<T>* initialize_resolved_entries_array(ClassLoaderData* loader_data, GrowableArray<T> entries, TRAPS) {
67 Array<T>* resolved_entries;
68 if (entries.length() != 0) {
69 resolved_entries = MetadataFactory::new_array<T>(loader_data, entries.length(), CHECK_NULL);
70 for (int i = 0; i < entries.length(); i++) {
71 resolved_entries->at_put(i, entries.at(i));
72 }
73 return resolved_entries;
74 }
75 return nullptr;
76 }
77
78 void ConstantPoolCache::set_direct_or_vtable_call(Bytecodes::Code invoke_code,
79 int method_index,
80 const methodHandle& method,
81 int vtable_index,
82 bool sender_is_interface) {
83 bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean
84 assert(method->interpreter_entry() != nullptr, "should have been set at this point");
85 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
86
87 int byte_no = -1;
88 bool change_to_virtual = false;
89 InstanceKlass* holder = nullptr; // have to declare this outside the switch
90 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
91 switch (invoke_code) {
92 case Bytecodes::_invokeinterface:
93 holder = method->method_holder();
94 // check for private interface method invocations
95 if (vtable_index == Method::nonvirtual_vtable_index && holder->is_interface() ) {
96 assert(method->is_private(), "unexpected non-private method");
97 assert(method->can_be_statically_bound(), "unexpected non-statically-bound method");
98
99 method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) |
100 ((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift));
101 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
102 assert(method_entry->is_vfinal(), "flags must be set");
103 method_entry->set_method(method());
104 byte_no = 2;
105 method_entry->set_klass(holder);
106 break;
107 }
108 else {
109 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface
110 // instruction links to a non-interface method (in Object). This can happen when
111 // an interface redeclares an Object method (like CharSequence declaring toString())
112 // or when invokeinterface is used explicitly.
113 // In that case, the method has no itable index and must be invoked as a virtual.
114 // Set a flag to keep track of this corner case.
115 assert(holder->is_interface() || holder == vmClasses::Object_klass(), "unexpected holder class");
116 assert(method->is_public(), "Calling non-public method in Object with invokeinterface");
117 change_to_virtual = true;
118
119 // ...and fall through as if we were handling invokevirtual:
120 }
121 case Bytecodes::_invokevirtual:
122 {
123 if (!is_vtable_call) {
124 assert(method->can_be_statically_bound(), "");
125 method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) |
126 ((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift) |
127 ((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift));
128 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
129 assert(method_entry->is_vfinal(), "flags must be set");
130 method_entry->set_method(method());
131 } else {
132 assert(!method->can_be_statically_bound(), "");
133 assert(vtable_index >= 0, "valid index");
134 assert(!method->is_final_method(), "sanity");
135 method_entry->set_flags((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift);
136 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
137 assert(!method_entry->is_vfinal(), "flags must not be set");
138 method_entry->set_table_index(vtable_index);
139 }
140 byte_no = 2;
141 break;
142 }
143
144 case Bytecodes::_invokespecial:
145 case Bytecodes::_invokestatic: {
146 assert(!is_vtable_call, "");
147 // Note: Read and preserve the value of the is_vfinal flag on any
148 // invokevirtual bytecode shared with this constant pool cache entry.
149 // It is cheap and safe to consult is_vfinal() at all times.
150 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
151 bool vfinal = method_entry->is_vfinal();
152 method_entry->set_flags(((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift));
153 assert(vfinal == method_entry->is_vfinal(), "Vfinal flag must be preserved");
154 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
155 method_entry->set_method(method());
156 byte_no = 1;
157 break;
158 }
159 default:
160 ShouldNotReachHere();
161 break;
162 }
163
164 // Note: byte_no also appears in TemplateTable::resolve.
165 if (byte_no == 1) {
166 assert(invoke_code != Bytecodes::_invokevirtual &&
167 invoke_code != Bytecodes::_invokeinterface, "");
168 bool do_resolve = true;
169 // Don't mark invokespecial to method as resolved if sender is an interface. The receiver
170 // has to be checked that it is a subclass of the current class every time this bytecode
171 // is executed.
172 if (invoke_code == Bytecodes::_invokespecial && sender_is_interface &&
173 method->name() != vmSymbols::object_initializer_name()) {
174 do_resolve = false;
175 }
176 if (invoke_code == Bytecodes::_invokestatic) {
177 assert(method->method_holder()->is_initialized() ||
178 method->method_holder()->is_reentrant_initialization(JavaThread::current()),
179 "invalid class initialization state for invoke_static");
180
181 if (!VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
182 // Don't mark invokestatic to method as resolved if the holder class has not yet completed
183 // initialization. An invokestatic must only proceed if the class is initialized, but if
184 // we resolve it before then that class initialization check is skipped.
185 //
186 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
187 // template interpreter supports fast class initialization check for
188 // invokestatic which doesn't require call site re-resolution to
189 // enforce class initialization barrier.
190 do_resolve = false;
191 }
192 }
193 if (do_resolve) {
194 method_entry->set_bytecode1(invoke_code);
195 }
196 } else if (byte_no == 2) {
197 if (change_to_virtual) {
198 assert(invoke_code == Bytecodes::_invokeinterface, "");
199 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!!
200 //
201 // Workaround for the case where we encounter an invokeinterface, but we
202 // should really have an _invokevirtual since the resolved method is a
203 // virtual method in java.lang.Object. This is a corner case in the spec
204 // but is presumably legal. javac does not generate this code.
205 //
206 // We do not set bytecode_1() to _invokeinterface, because that is the
207 // bytecode # used by the interpreter to see if it is resolved. In this
208 // case, the method gets reresolved with caller for each interface call
209 // because the actual selected method may not be public.
210 //
211 // We set bytecode_2() to _invokevirtual.
212 // See also interpreterRuntime.cpp. (8/25/2000)
213 } else {
214 assert(invoke_code == Bytecodes::_invokevirtual ||
215 (invoke_code == Bytecodes::_invokeinterface &&
216 ((method->is_private() ||
217 (method->is_final() && method->method_holder() == vmClasses::Object_klass())))),
218 "unexpected invocation mode");
219 if (invoke_code == Bytecodes::_invokeinterface &&
220 (method->is_private() || method->is_final())) {
221 // We set bytecode_1() to _invokeinterface, because that is the
222 // bytecode # used by the interpreter to see if it is resolved.
223 // We set bytecode_2() to _invokevirtual.
224 method_entry->set_bytecode1(invoke_code);
225 }
226 }
227 // set up for invokevirtual, even if linking for invokeinterface also:
228 method_entry->set_bytecode2(Bytecodes::_invokevirtual);
229 } else {
230 ShouldNotReachHere();
231 }
232 }
233
234 void ConstantPoolCache::set_direct_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method,
235 bool sender_is_interface) {
236 int index = Method::nonvirtual_vtable_index;
237 // index < 0; FIXME: inline and customize set_direct_or_vtable_call
238 set_direct_or_vtable_call(invoke_code, method_index, method, index, sender_is_interface);
239 }
240
241 void ConstantPoolCache::set_vtable_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method, int index) {
242 // either the method is a miranda or its holder should accept the given index
243 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), "");
244 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call
245 set_direct_or_vtable_call(invoke_code, method_index, method, index, false);
246 }
247
248 void ConstantPoolCache::set_itable_call(Bytecodes::Code invoke_code,
249 int method_index,
250 Klass* referenced_klass,
251 const methodHandle& method, int index) {
252 assert(method->method_holder()->verify_itable_index(index), "");
253 assert(invoke_code == Bytecodes::_invokeinterface, "");
254 InstanceKlass* interf = method->method_holder();
255 assert(interf->is_interface(), "must be an interface");
256 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here");
257 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
258 method_entry->set_klass(static_cast<InstanceKlass*>(referenced_klass));
259 method_entry->set_method(method());
260 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
261 method_entry->set_bytecode1(Bytecodes::_invokeinterface);
262 }
263
264 ResolvedMethodEntry* ConstantPoolCache::set_method_handle(int method_index, const CallInfo &call_info) {
265 // NOTE: This method entry can be the subject of data races.
266 // There are three words to update: flags, refs[appendix_index], method (in that order).
267 // Writers must store all other values before method.
268 // Readers must test the method first for non-null before reading other fields.
269 // Competing writers must acquire exclusive access via a lock.
270 // A losing writer waits on the lock until the winner writes the method and leaves
271 // the lock, so that when the losing writer returns, he can use the linked
272 // cache entry.
273
274 // Lock fields to write
275 Bytecodes::Code invoke_code = Bytecodes::_invokehandle;
276
277 JavaThread* current = JavaThread::current();
278 objArrayHandle resolved_references(current, constant_pool()->resolved_references());
279 // Use the resolved_references() lock for this cpCache entry.
280 // resolved_references are created for all classes with Invokedynamic, MethodHandle
281 // or MethodType constant pool cache entries.
282 assert(resolved_references() != nullptr,
283 "a resolved_references array should have been created for this class");
284 ObjectLocker ol(resolved_references, current);
285
286 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
287 if (method_entry->is_resolved(invoke_code)) {
288 return method_entry;
289 }
290
291 Method* adapter = call_info.resolved_method();
292 const Handle appendix = call_info.resolved_appendix();
293 const bool has_appendix = appendix.not_null();
294
295 // Write the flags.
296 // MHs are always sig-poly and have a local signature.
297 method_entry->fill_in((u1)as_TosState(adapter->result_type()), (u2)adapter->size_of_parameters());
298 method_entry->set_flags(((has_appendix ? 1 : 0) << ResolvedMethodEntry::has_appendix_shift ) |
299 ( 1 << ResolvedMethodEntry::has_local_signature_shift ) |
300 ( 1 << ResolvedMethodEntry::is_final_shift ));
301
302 // Method handle invokes use both a method and a resolved references index.
303 // refs[appendix_index], if not null, contains a value passed as a trailing argument to the adapter.
304 // In the general case, this could be the call site's MethodType,
305 // for use with java.lang.Invokers.checkExactType, or else a CallSite object.
306 // method_entry->method() contains the adapter method which manages the actual call.
307 // In the general case, this is a compiled LambdaForm.
308 // (The Java code is free to optimize these calls by binding other
309 // sorts of methods and appendices to call sites.)
310 // JVM-level linking is via the method, as if for invokespecial, and signatures are erased.
311 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits.
312 // Even with the appendix, the method will never take more than 255 parameter slots.
313 //
314 // This means that given a call site like (List)mh.invoke("foo"),
315 // the method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;',
316 // not '(Ljava/lang/String;)Ljava/util/List;'.
317 // The fact that String and List are involved is encoded in the MethodType in refs[appendix_index].
318 // This allows us to create fewer Methods, while keeping type safety.
319 //
320
321 // Store appendix, if any.
322 if (has_appendix) {
323 const int appendix_index = method_entry->resolved_references_index();
324 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
325 assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
326 resolved_references->obj_at_put(appendix_index, appendix());
327 }
328
329 method_entry->set_method(adapter); // This must be the last one to set (see NOTE above)!
330
331 // The interpreter assembly code does not check byte_2,
332 // but it is used by is_resolved, method_if_resolved, etc.
333 method_entry->set_bytecode1(invoke_code);
334
335 assert(has_appendix == method_entry->has_appendix(), "proper storage of appendix flag");
336 assert(method_entry->has_local_signature(), "proper storage of signature flag");
337 return method_entry;
338 }
339
340 Method* ConstantPoolCache::method_if_resolved(int method_index) const {
341 // Decode the action of set_method and set_interface_call
342 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
343
344 Bytecodes::Code invoke_code = (Bytecodes::Code)method_entry->bytecode1();
345 switch (invoke_code) {
346 case Bytecodes::_invokeinterface:
347 case Bytecodes::_invokestatic:
348 case Bytecodes::_invokespecial:
349 assert(!method_entry->has_appendix(), "");
350 // fall through
351 case Bytecodes::_invokehandle:
352 return method_entry->method();
353 case Bytecodes::_invokedynamic:
354 ShouldNotReachHere();
355 default:
356 assert(invoke_code == (Bytecodes::Code)0, "unexpected bytecode");
357 break;
358 }
359
360 invoke_code = (Bytecodes::Code)method_entry->bytecode2();
361 if (invoke_code == Bytecodes::_invokevirtual) {
362 if (method_entry->is_vfinal()) {
363 return method_entry->method();
364 } else {
365 int holder_index = constant_pool()->uncached_klass_ref_index_at(method_entry->constant_pool_index());
366 if (constant_pool()->tag_at(holder_index).is_klass()) {
367 Klass* klass = constant_pool()->resolved_klass_at(holder_index);
368 return klass->method_at_vtable(method_entry->table_index());
369 }
370 }
371 }
372 return nullptr;
373 }
374
375 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data,
376 const intStack& invokedynamic_map,
377 const GrowableArray<ResolvedIndyEntry> indy_entries,
378 const GrowableArray<ResolvedFieldEntry> field_entries,
379 const GrowableArray<ResolvedMethodEntry> method_entries,
380 TRAPS) {
381
382 int size = ConstantPoolCache::size();
383
384 // Initialize resolved entry arrays with available data
385 Array<ResolvedFieldEntry>* resolved_field_entries = initialize_resolved_entries_array(loader_data, field_entries, CHECK_NULL);
386 Array<ResolvedIndyEntry>* resolved_indy_entries = initialize_resolved_entries_array(loader_data, indy_entries, CHECK_NULL);
387 Array<ResolvedMethodEntry>* resolved_method_entries = initialize_resolved_entries_array(loader_data, method_entries, CHECK_NULL);
388
389 return new (loader_data, size, MetaspaceObj::ConstantPoolCacheType, THREAD)
390 ConstantPoolCache(invokedynamic_map, resolved_indy_entries, resolved_field_entries, resolved_method_entries);
391 }
392
393 // Record the GC marking cycle when redefined vs. when found in the loom stack chunks.
394 void ConstantPoolCache::record_gc_epoch() {
395 _gc_epoch = CodeCache::gc_epoch();
396 }
397
398 #if INCLUDE_CDS
399 void ConstantPoolCache::remove_unshareable_info() {
400 assert(CDSConfig::is_dumping_archive(), "sanity");
401
402 if (_resolved_indy_entries != nullptr) {
403 remove_resolved_indy_entries_if_non_deterministic();
404 }
405 if (_resolved_field_entries != nullptr) {
406 remove_resolved_field_entries_if_non_deterministic();
407 }
408 if (_resolved_method_entries != nullptr) {
409 remove_resolved_method_entries_if_non_deterministic();
410 }
411
412 #if INCLUDE_CDS_JAVA_HEAP
413 _archived_references_index = -1;
414 if (CDSConfig::is_dumping_heap()) {
415 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(constant_pool());
416 oop rr = HeapShared::scratch_resolved_references(src_cp);
417 if (rr != nullptr) {
418 _archived_references_index = HeapShared::append_root(rr);
419 }
420 }
421 #endif
422 }
423
424 void ConstantPoolCache::remove_resolved_field_entries_if_non_deterministic() {
425 ConstantPool* cp = constant_pool();
426 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
427 for (int i = 0; i < _resolved_field_entries->length(); i++) {
428 ResolvedFieldEntry* rfi = _resolved_field_entries->adr_at(i);
429 int cp_index = rfi->constant_pool_index();
430 bool archived = false;
431 bool resolved = rfi->is_resolved(Bytecodes::_getfield) ||
432 rfi->is_resolved(Bytecodes::_putfield);
433 if (resolved && AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) {
434 rfi->mark_and_relocate();
435 archived = true;
436 } else {
437 rfi->remove_unshareable_info();
438 }
439 if (resolved) {
440 LogStreamHandle(Trace, cds, resolve) log;
441 if (log.is_enabled()) {
442 ResourceMark rm;
443 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
444 Symbol* klass_name = cp->klass_name_at(klass_cp_index);
445 Symbol* name = cp->uncached_name_ref_at(cp_index);
446 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
447 log.print("%s field CP entry [%3d]: %s => %s.%s:%s",
448 (archived ? "archived" : "reverted"),
449 cp_index,
450 cp->pool_holder()->name()->as_C_string(),
451 klass_name->as_C_string(), name->as_C_string(), signature->as_C_string());
452 }
453 }
454 ArchiveBuilder::alloc_stats()->record_field_cp_entry(archived, resolved && !archived);
455 }
456 }
457
458 void ConstantPoolCache::remove_resolved_method_entries_if_non_deterministic() {
459 ConstantPool* cp = constant_pool();
460 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
461 for (int i = 0; i < _resolved_method_entries->length(); i++) {
462 ResolvedMethodEntry* rme = _resolved_method_entries->adr_at(i);
463 int cp_index = rme->constant_pool_index();
464 bool archived = false;
465 bool resolved = rme->is_resolved(Bytecodes::_invokevirtual) ||
466 rme->is_resolved(Bytecodes::_invokespecial) ||
467 rme->is_resolved(Bytecodes::_invokeinterface) ||
468 rme->is_resolved(Bytecodes::_invokehandle);
469
470 // Just for safety -- this should not happen, but do not archive if we ever see this.
471 resolved &= !(rme->is_resolved(Bytecodes::_invokestatic));
472
473 if (resolved && can_archive_resolved_method(src_cp, rme)) {
474 rme->mark_and_relocate(src_cp);
475 archived = true;
476 } else {
477 rme->remove_unshareable_info();
478 }
479 if (resolved) {
480 LogStreamHandle(Trace, cds, resolve) log;
481 if (log.is_enabled()) {
482 ResourceMark rm;
483 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
484 Symbol* klass_name = cp->klass_name_at(klass_cp_index);
485 Symbol* name = cp->uncached_name_ref_at(cp_index);
486 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
487 log.print("%s%s method CP entry [%3d]: %s %s.%s:%s",
488 (archived ? "archived" : "reverted"),
489 (rme->is_resolved(Bytecodes::_invokeinterface) ? " interface" : ""),
490 cp_index,
491 cp->pool_holder()->name()->as_C_string(),
492 klass_name->as_C_string(), name->as_C_string(), signature->as_C_string());
493 if (archived) {
494 Klass* resolved_klass = cp->resolved_klass_at(klass_cp_index);
495 log.print(" => %s%s",
496 resolved_klass->name()->as_C_string(),
497 (rme->is_resolved(Bytecodes::_invokestatic) ? " *** static" : ""));
498 }
499 }
500 ArchiveBuilder::alloc_stats()->record_method_cp_entry(archived, resolved && !archived);
501 }
502 }
503 }
504
505 void ConstantPoolCache::remove_resolved_indy_entries_if_non_deterministic() {
506 ConstantPool* cp = constant_pool();
507 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
508 for (int i = 0; i < _resolved_indy_entries->length(); i++) {
509 ResolvedIndyEntry* rei = _resolved_indy_entries->adr_at(i);
510 int cp_index = rei->constant_pool_index();
511 bool archived = false;
512 bool resolved = rei->is_resolved();
513 if (resolved && AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) {
514 rei->mark_and_relocate();
515 archived = true;
516 } else {
517 rei->remove_unshareable_info();
518 }
519 if (resolved) {
520 LogStreamHandle(Trace, cds, resolve) log;
521 if (log.is_enabled()) {
522 ResourceMark rm;
523 int bsm = cp->bootstrap_method_ref_index_at(cp_index);
524 int bsm_ref = cp->method_handle_index_at(bsm);
525 Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref);
526 Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref);
527 Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref));
528 log.print("%s indy CP entry [%3d]: %s (%d)",
529 (archived ? "archived" : "reverted"),
530 cp_index, cp->pool_holder()->name()->as_C_string(), i);
531 log.print(" %s %s.%s:%s", (archived ? "=>" : " "), bsm_klass->as_C_string(),
532 bsm_name->as_C_string(), bsm_signature->as_C_string());
533 }
534 ArchiveBuilder::alloc_stats()->record_indy_cp_entry(archived, resolved && !archived);
535 }
536 }
537 }
538
539 bool ConstantPoolCache::can_archive_resolved_method(ConstantPool* src_cp, ResolvedMethodEntry* method_entry) {
540 InstanceKlass* pool_holder = constant_pool()->pool_holder();
541 if (!(pool_holder->is_shared_boot_class() || pool_holder->is_shared_platform_class() ||
542 pool_holder->is_shared_app_class())) {
543 // Archiving resolved cp entries for classes from non-builtin loaders
544 // is not yet supported.
545 return false;
546 }
547
548 if (CDSConfig::is_dumping_dynamic_archive()) {
549 // InstanceKlass::methods() has been resorted. We need to
550 // update the vtable_index in method_entry (not implemented)
551 return false;
552 }
553
554 if (!method_entry->is_resolved(Bytecodes::_invokevirtual)) {
555 if (method_entry->method() == nullptr) {
556 return false;
557 }
558 if (method_entry->method()->is_continuation_native_intrinsic()) {
559 return false; // FIXME: corresponding stub is generated on demand during method resolution (see LinkResolver::resolve_static_call).
560 }
561 }
562
563 int cp_index = method_entry->constant_pool_index();
564 assert(src_cp->tag_at(cp_index).is_method() || src_cp->tag_at(cp_index).is_interface_method(), "sanity");
565
566 if (!AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) {
567 return false;
568 }
569
570 if (method_entry->is_resolved(Bytecodes::_invokeinterface) ||
571 method_entry->is_resolved(Bytecodes::_invokevirtual) ||
572 method_entry->is_resolved(Bytecodes::_invokespecial)) {
573 return true;
574 } else if (method_entry->is_resolved(Bytecodes::_invokehandle)) {
575 if (CDSConfig::is_dumping_invokedynamic()) {
576 // invokehandle depends on archived MethodType and LambdaForms.
577 return true;
578 } else {
579 return false;
580 }
581 } else {
582 return false;
583 }
584 }
585 #endif // INCLUDE_CDS
586
587 void ConstantPoolCache::deallocate_contents(ClassLoaderData* data) {
588 assert(!is_shared(), "shared caches are not deallocated");
589 data->remove_handle(_resolved_references);
590 set_resolved_references(OopHandle());
591 MetadataFactory::free_array<u2>(data, _reference_map);
592 set_reference_map(nullptr);
593 #if INCLUDE_CDS
594 if (_resolved_indy_entries != nullptr) {
595 MetadataFactory::free_array<ResolvedIndyEntry>(data, _resolved_indy_entries);
596 _resolved_indy_entries = nullptr;
597 }
598 if (_resolved_field_entries != nullptr) {
599 MetadataFactory::free_array<ResolvedFieldEntry>(data, _resolved_field_entries);
600 _resolved_field_entries = nullptr;
601 }
602 if (_resolved_method_entries != nullptr) {
603 MetadataFactory::free_array<ResolvedMethodEntry>(data, _resolved_method_entries);
604 _resolved_method_entries = nullptr;
605 }
606 #endif
607 }
608
609 #if INCLUDE_CDS_JAVA_HEAP
610 oop ConstantPoolCache::archived_references() {
611 if (_archived_references_index < 0) {
612 return nullptr;
613 }
614 return HeapShared::get_root(_archived_references_index);
615 }
616
617 void ConstantPoolCache::clear_archived_references() {
618 if (_archived_references_index >= 0) {
619 HeapShared::clear_root(_archived_references_index);
620 _archived_references_index = -1;
621 }
622 }
623 #endif
624
625 #if INCLUDE_JVMTI
626 static void log_adjust(const char* entry_type, Method* old_method, Method* new_method, bool* trace_name_printed) {
627 ResourceMark rm;
628
629 if (!(*trace_name_printed)) {
630 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
631 *trace_name_printed = true;
632 }
633 log_trace(redefine, class, update, constantpool)
634 ("cpc %s entry update: %s", entry_type, new_method->external_name());
635 }
636
637 // RedefineClasses() API support:
638 // If any entry of this ConstantPoolCache points to any of
639 // old_methods, replace it with the corresponding new_method.
640 void ConstantPoolCache::adjust_method_entries(bool * trace_name_printed) {
641 if (_resolved_indy_entries != nullptr) {
642 for (int j = 0; j < _resolved_indy_entries->length(); j++) {
643 Method* old_method = resolved_indy_entry_at(j)->method();
644 if (old_method == nullptr || !old_method->is_old()) {
645 continue;
646 }
647 assert(!old_method->is_deleted(), "cannot delete these methods");
648 Method* new_method = old_method->get_new_method();
649 resolved_indy_entry_at(j)->adjust_method_entry(new_method);
650 log_adjust("indy", old_method, new_method, trace_name_printed);
651 }
652 }
653 if (_resolved_method_entries != nullptr) {
654 for (int i = 0; i < _resolved_method_entries->length(); i++) {
655 ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
656 // get interesting method entry
657 Method* old_method = method_entry->method();
658 if (old_method == nullptr || !old_method->is_old()) {
659 continue; // skip uninteresting entries
660 }
661 if (old_method->is_deleted()) {
662 // clean up entries with deleted methods
663 method_entry->reset_entry();
664 continue;
665 }
666 Method* new_method = old_method->get_new_method();
667 method_entry->adjust_method_entry(new_method);
668 log_adjust("non-indy", old_method, new_method, trace_name_printed);
669 }
670 }
671 }
672
673 // the constant pool cache should never contain old or obsolete methods
674 bool ConstantPoolCache::check_no_old_or_obsolete_entries() {
675 ResourceMark rm;
676 if (_resolved_indy_entries != nullptr) {
677 for (int i = 0; i < _resolved_indy_entries->length(); i++) {
678 Method* m = resolved_indy_entry_at(i)->method();
679 if (m != nullptr && !resolved_indy_entry_at(i)->check_no_old_or_obsolete_entry()) {
680 log_trace(redefine, class, update, constantpool)
681 ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
682 constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
683 return false;
684 }
685 }
686 }
687 if (_resolved_method_entries != nullptr) {
688 for (int i = 0; i < _resolved_method_entries->length(); i++) {
689 ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
690 Method* m = method_entry->method();
691 if (m != nullptr && !method_entry->check_no_old_or_obsolete_entry()) {
692 log_trace(redefine, class, update, constantpool)
693 ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
694 constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
695 return false;
696 }
697 }
698 }
699 return true;
700 }
701
702 void ConstantPoolCache::dump_cache() {
703 print_on(tty);
704 }
705 #endif // INCLUDE_JVMTI
706
707 void ConstantPoolCache::metaspace_pointers_do(MetaspaceClosure* it) {
708 log_trace(cds)("Iter(ConstantPoolCache): %p", this);
709 it->push(&_constant_pool);
710 it->push(&_reference_map);
711 if (_resolved_indy_entries != nullptr) {
712 it->push(&_resolved_indy_entries, MetaspaceClosure::_writable);
713 }
714 if (_resolved_field_entries != nullptr) {
715 it->push(&_resolved_field_entries, MetaspaceClosure::_writable);
716 }
717 if (_resolved_method_entries != nullptr) {
718 it->push(&_resolved_method_entries, MetaspaceClosure::_writable);
719 }
720 }
721
722 bool ConstantPoolCache::save_and_throw_indy_exc(
723 const constantPoolHandle& cpool, int cpool_index, int index, constantTag tag, TRAPS) {
724
725 assert(HAS_PENDING_EXCEPTION, "No exception got thrown!");
726 assert(PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass()),
727 "No LinkageError exception");
728
729 // Use the resolved_references() lock for this cpCache entry.
730 // resolved_references are created for all classes with Invokedynamic, MethodHandle
731 // or MethodType constant pool cache entries.
732 JavaThread* current = THREAD;
733 objArrayHandle resolved_references(current, cpool->resolved_references());
734 assert(resolved_references() != nullptr,
735 "a resolved_references array should have been created for this class");
736 ObjectLocker ol(resolved_references, current);
737
738 // if the indy_info is resolved or the indy_resolution_failed flag is set then another
739 // thread either succeeded in resolving the method or got a LinkageError
740 // exception, before this thread was able to record its failure. So, clear
741 // this thread's exception and return false so caller can use the earlier
742 // thread's result.
743 if (resolved_indy_entry_at(index)->is_resolved() || resolved_indy_entry_at(index)->resolution_failed()) {
744 CLEAR_PENDING_EXCEPTION;
745 return false;
746 }
747 ResourceMark rm(THREAD);
748 Symbol* error = PENDING_EXCEPTION->klass()->name();
749 const char* message = java_lang_Throwable::message_as_utf8(PENDING_EXCEPTION);
750
751 int encoded_index = ResolutionErrorTable::encode_indy_index(index);
752 SystemDictionary::add_resolution_error(cpool, encoded_index, error, message);
753 resolved_indy_entry_at(index)->set_resolution_failed();
754 return true;
755 }
756
757 oop ConstantPoolCache::set_dynamic_call(const CallInfo &call_info, int index) {
758 ResourceMark rm;
759
760 // Use the resolved_references() lock for this cpCache entry.
761 // resolved_references are created for all classes with Invokedynamic, MethodHandle
762 // or MethodType constant pool cache entries.
763 JavaThread* current = JavaThread::current();
764 constantPoolHandle cp(current, constant_pool());
765
766 objArrayHandle resolved_references(current, cp->resolved_references());
767 assert(resolved_references() != nullptr,
768 "a resolved_references array should have been created for this class");
769 ObjectLocker ol(resolved_references, current);
770 assert(index >= 0, "Indy index must be positive at this point");
771
772 if (resolved_indy_entry_at(index)->method() != nullptr) {
773 return cp->resolved_reference_from_indy(index);
774 }
775
776 if (resolved_indy_entry_at(index)->resolution_failed()) {
777 // Before we got here, another thread got a LinkageError exception during
778 // resolution. Ignore our success and throw their exception.
779 guarantee(index >= 0, "Invalid indy index");
780 int encoded_index = ResolutionErrorTable::encode_indy_index(index);
781 ConstantPool::throw_resolution_error(cp, encoded_index, current);
782 return nullptr;
783 }
784
785 Method* adapter = call_info.resolved_method();
786 const Handle appendix = call_info.resolved_appendix();
787 const bool has_appendix = appendix.not_null();
788
789 LogStream* log_stream = nullptr;
790 LogStreamHandle(Debug, methodhandles, indy) lsh_indy;
791 if (lsh_indy.is_enabled()) {
792 ResourceMark rm;
793 log_stream = &lsh_indy;
794 log_stream->print_cr("set_method_handle bc=%d appendix=" PTR_FORMAT "%s method=" PTR_FORMAT " (local signature) ",
795 0xba,
796 p2i(appendix()),
797 (has_appendix ? "" : " (unused)"),
798 p2i(adapter));
799 adapter->print_on(log_stream);
800 if (has_appendix) appendix()->print_on(log_stream);
801 }
802
803 if (has_appendix) {
804 const int appendix_index = resolved_indy_entry_at(index)->resolved_references_index();
805 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
806 assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
807 resolved_references->obj_at_put(appendix_index, appendix());
808 }
809
810 // Populate entry with resolved information
811 assert(resolved_indy_entries() != nullptr, "Invokedynamic array is empty, cannot fill with resolved information");
812 resolved_indy_entry_at(index)->fill_in(adapter, adapter->size_of_parameters(), as_TosState(adapter->result_type()), has_appendix);
813
814 if (log_stream != nullptr) {
815 resolved_indy_entry_at(index)->print_on(log_stream);
816 }
817 return appendix();
818 }
819
820 oop ConstantPoolCache::appendix_if_resolved(int method_index) const {
821 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
822 return appendix_if_resolved(method_entry);
823 }
824
825 oop ConstantPoolCache::appendix_if_resolved(ResolvedMethodEntry* method_entry) const {
826 if (!method_entry->has_appendix())
827 return nullptr;
828 const int ref_index = method_entry->resolved_references_index();
829 return constant_pool()->resolved_reference_at(ref_index);
830 }
831
832 // Printing
833
834 void ConstantPoolCache::print_on(outputStream* st) const {
835 st->print_cr("%s", internal_name());
836 // print constant pool cache entries
837 if (_resolved_field_entries != nullptr) {
838 print_resolved_field_entries(st);
839 }
840 if (_resolved_method_entries != nullptr) {
841 print_resolved_method_entries(st);
842 }
843 if (_resolved_indy_entries != nullptr) {
844 print_resolved_indy_entries(st);
845 }
846 }
847
848 void ConstantPoolCache::print_resolved_field_entries(outputStream* st) const {
849 for (int field_index = 0; field_index < resolved_field_entries_length(); field_index++) {
850 resolved_field_entry_at(field_index)->print_on(st);
851 }
852 }
853
854 void ConstantPoolCache::print_resolved_method_entries(outputStream* st) const {
855 for (int method_index = 0; method_index < resolved_method_entries_length(); method_index++) {
856 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
857 method_entry->print_on(st);
858 if (method_entry->has_appendix()) {
859 st->print(" appendix: ");
860 constant_pool()->resolved_reference_from_method(method_index)->print_on(st);
861 }
862 }
863 }
864
865 void ConstantPoolCache::print_resolved_indy_entries(outputStream* st) const {
866 for (int indy_index = 0; indy_index < resolved_indy_entries_length(); indy_index++) {
867 ResolvedIndyEntry* indy_entry = resolved_indy_entry_at(indy_index);
868 indy_entry->print_on(st);
869 if (indy_entry->has_appendix()) {
870 st->print(" appendix: ");
871 constant_pool()->resolved_reference_from_indy(indy_index)->print_on(st);
872 }
873 }
874 }