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 invoke_code = Bytecodes::_invokevirtual;
214 } else {
215 assert(invoke_code == Bytecodes::_invokevirtual ||
216 (invoke_code == Bytecodes::_invokeinterface &&
217 ((method->is_private() ||
218 (method->is_final() && method->method_holder() == vmClasses::Object_klass())))),
219 "unexpected invocation mode");
220 if (invoke_code == Bytecodes::_invokeinterface &&
221 (method->is_private() || method->is_final())) {
222 // We set bytecode_1() to _invokeinterface, because that is the
223 // bytecode # used by the interpreter to see if it is resolved.
224 // We set bytecode_2() to _invokevirtual.
225 method_entry->set_bytecode1(invoke_code);
226 }
227 }
228 // set up for invokevirtual, even if linking for invokeinterface also:
229 method_entry->set_bytecode2(invoke_code);
230 } else {
231 ShouldNotReachHere();
232 }
233 }
234
235 void ConstantPoolCache::set_direct_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method,
236 bool sender_is_interface) {
237 int index = Method::nonvirtual_vtable_index;
238 // index < 0; FIXME: inline and customize set_direct_or_vtable_call
239 set_direct_or_vtable_call(invoke_code, method_index, method, index, sender_is_interface);
240 }
241
242 void ConstantPoolCache::set_vtable_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method, int index) {
243 // either the method is a miranda or its holder should accept the given index
244 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), "");
245 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call
246 set_direct_or_vtable_call(invoke_code, method_index, method, index, false);
247 }
248
249 void ConstantPoolCache::set_itable_call(Bytecodes::Code invoke_code,
250 int method_index,
251 Klass* referenced_klass,
252 const methodHandle& method, int index) {
253 assert(method->method_holder()->verify_itable_index(index), "");
254 assert(invoke_code == Bytecodes::_invokeinterface, "");
255 InstanceKlass* interf = method->method_holder();
256 assert(interf->is_interface(), "must be an interface");
257 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here");
258 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
259 method_entry->set_klass(static_cast<InstanceKlass*>(referenced_klass));
260 method_entry->set_method(method());
261 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
262 method_entry->set_bytecode1(Bytecodes::_invokeinterface);
263 }
264
265 ResolvedMethodEntry* ConstantPoolCache::set_method_handle(int method_index, const CallInfo &call_info) {
266 // NOTE: This method entry can be the subject of data races.
267 // There are three words to update: flags, refs[appendix_index], method (in that order).
268 // Writers must store all other values before method.
269 // Readers must test the method first for non-null before reading other fields.
270 // Competing writers must acquire exclusive access via a lock.
271 // A losing writer waits on the lock until the winner writes the method and leaves
272 // the lock, so that when the losing writer returns, he can use the linked
273 // cache entry.
274
275 // Lock fields to write
276 Bytecodes::Code invoke_code = Bytecodes::_invokehandle;
277
278 JavaThread* current = JavaThread::current();
279 objArrayHandle resolved_references(current, constant_pool()->resolved_references());
280 // Use the resolved_references() lock for this cpCache entry.
281 // resolved_references are created for all classes with Invokedynamic, MethodHandle
282 // or MethodType constant pool cache entries.
283 assert(resolved_references() != nullptr,
284 "a resolved_references array should have been created for this class");
285 ObjectLocker ol(resolved_references, current);
286
287 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
288 if (method_entry->is_resolved(invoke_code)) {
289 return method_entry;
290 }
291
292 Method* adapter = call_info.resolved_method();
293 const Handle appendix = call_info.resolved_appendix();
294 const bool has_appendix = appendix.not_null();
295
296 // Write the flags.
297 // MHs are always sig-poly and have a local signature.
298 method_entry->fill_in((u1)as_TosState(adapter->result_type()), (u2)adapter->size_of_parameters());
299 method_entry->set_flags(((has_appendix ? 1 : 0) << ResolvedMethodEntry::has_appendix_shift ) |
300 ( 1 << ResolvedMethodEntry::has_local_signature_shift ) |
301 ( 1 << ResolvedMethodEntry::is_final_shift ));
302
303 // Method handle invokes use both a method and a resolved references index.
304 // refs[appendix_index], if not null, contains a value passed as a trailing argument to the adapter.
305 // In the general case, this could be the call site's MethodType,
306 // for use with java.lang.Invokers.checkExactType, or else a CallSite object.
307 // method_entry->method() contains the adapter method which manages the actual call.
308 // In the general case, this is a compiled LambdaForm.
309 // (The Java code is free to optimize these calls by binding other
310 // sorts of methods and appendices to call sites.)
311 // JVM-level linking is via the method, as if for invokespecial, and signatures are erased.
312 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits.
313 // Even with the appendix, the method will never take more than 255 parameter slots.
314 //
315 // This means that given a call site like (List)mh.invoke("foo"),
316 // the method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;',
317 // not '(Ljava/lang/String;)Ljava/util/List;'.
318 // The fact that String and List are involved is encoded in the MethodType in refs[appendix_index].
319 // This allows us to create fewer Methods, while keeping type safety.
320 //
321
322 // Store appendix, if any.
323 if (has_appendix) {
324 const int appendix_index = method_entry->resolved_references_index();
325 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
326 assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
327 resolved_references->obj_at_put(appendix_index, appendix());
328 }
329
330 method_entry->set_method(adapter); // This must be the last one to set (see NOTE above)!
331
332 // The interpreter assembly code does not check byte_2,
333 // but it is used by is_resolved, method_if_resolved, etc.
334 method_entry->set_bytecode1(invoke_code);
335
336 assert(has_appendix == method_entry->has_appendix(), "proper storage of appendix flag");
337 assert(method_entry->has_local_signature(), "proper storage of signature flag");
338 return method_entry;
339 }
340
341 Method* ConstantPoolCache::method_if_resolved(int method_index) const {
342 // Decode the action of set_method and set_interface_call
343 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
344
345 Bytecodes::Code invoke_code = (Bytecodes::Code)method_entry->bytecode1();
346 switch (invoke_code) {
347 case Bytecodes::_invokeinterface:
348 case Bytecodes::_invokestatic:
349 case Bytecodes::_invokespecial:
350 assert(!method_entry->has_appendix(), "");
351 // fall through
352 case Bytecodes::_invokehandle:
353 return method_entry->method();
354 case Bytecodes::_invokedynamic:
355 ShouldNotReachHere();
356 default:
357 assert(invoke_code == (Bytecodes::Code)0, "unexpected bytecode");
358 break;
359 }
360
361 invoke_code = (Bytecodes::Code)method_entry->bytecode2();
362 if (invoke_code == Bytecodes::_invokevirtual) {
363 if (method_entry->is_vfinal()) {
364 return method_entry->method();
365 } else {
366 int holder_index = constant_pool()->uncached_klass_ref_index_at(method_entry->constant_pool_index());
367 if (constant_pool()->tag_at(holder_index).is_klass()) {
368 Klass* klass = constant_pool()->resolved_klass_at(holder_index);
369 return klass->method_at_vtable(method_entry->table_index());
370 }
371 }
372 }
373 return nullptr;
374 }
375
376 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data,
377 const intStack& invokedynamic_map,
378 const GrowableArray<ResolvedIndyEntry> indy_entries,
379 const GrowableArray<ResolvedFieldEntry> field_entries,
380 const GrowableArray<ResolvedMethodEntry> method_entries,
381 TRAPS) {
382
383 int size = ConstantPoolCache::size();
384
385 // Initialize resolved entry arrays with available data
386 Array<ResolvedFieldEntry>* resolved_field_entries = initialize_resolved_entries_array(loader_data, field_entries, CHECK_NULL);
387 Array<ResolvedIndyEntry>* resolved_indy_entries = initialize_resolved_entries_array(loader_data, indy_entries, CHECK_NULL);
388 Array<ResolvedMethodEntry>* resolved_method_entries = initialize_resolved_entries_array(loader_data, method_entries, CHECK_NULL);
389
390 return new (loader_data, size, MetaspaceObj::ConstantPoolCacheType, THREAD)
391 ConstantPoolCache(invokedynamic_map, resolved_indy_entries, resolved_field_entries, resolved_method_entries);
392 }
393
394 // Record the GC marking cycle when redefined vs. when found in the loom stack chunks.
395 void ConstantPoolCache::record_gc_epoch() {
396 _gc_epoch = CodeCache::gc_epoch();
397 }
398
399 #if INCLUDE_CDS
400 void ConstantPoolCache::remove_unshareable_info() {
401 assert(CDSConfig::is_dumping_archive(), "sanity");
402
403 if (_resolved_indy_entries != nullptr) {
404 remove_resolved_indy_entries_if_non_deterministic();
405 }
406 if (_resolved_field_entries != nullptr) {
407 remove_resolved_field_entries_if_non_deterministic();
408 }
409 if (_resolved_method_entries != nullptr) {
410 remove_resolved_method_entries_if_non_deterministic();
411 }
412
413 #if INCLUDE_CDS_JAVA_HEAP
414 _archived_references_index = -1;
415 if (CDSConfig::is_dumping_heap()) {
416 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(constant_pool());
417 oop rr = HeapShared::scratch_resolved_references(src_cp);
418 if (rr != nullptr) {
419 _archived_references_index = HeapShared::append_root(rr);
420 }
421 }
422 #endif
423 }
424
425 void ConstantPoolCache::remove_resolved_field_entries_if_non_deterministic() {
426 ConstantPool* cp = constant_pool();
427 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
428 for (int i = 0; i < _resolved_field_entries->length(); i++) {
429 ResolvedFieldEntry* rfi = _resolved_field_entries->adr_at(i);
430 int cp_index = rfi->constant_pool_index();
431 bool archived = false;
432 bool resolved = rfi->is_resolved(Bytecodes::_getfield) ||
433 rfi->is_resolved(Bytecodes::_putfield);
434 if (resolved && AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) {
435 rfi->mark_and_relocate();
436 archived = true;
437 } else {
438 rfi->remove_unshareable_info();
439 }
440 if (resolved) {
441 LogStreamHandle(Trace, cds, resolve) log;
442 if (log.is_enabled()) {
443 ResourceMark rm;
444 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
445 Symbol* klass_name = cp->klass_name_at(klass_cp_index);
446 Symbol* name = cp->uncached_name_ref_at(cp_index);
447 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
448 log.print("%s field CP entry [%3d]: %s => %s.%s:%s",
449 (archived ? "archived" : "reverted"),
450 cp_index,
451 cp->pool_holder()->name()->as_C_string(),
452 klass_name->as_C_string(), name->as_C_string(), signature->as_C_string());
453 }
454 }
455 ArchiveBuilder::alloc_stats()->record_field_cp_entry(archived, resolved && !archived);
456 }
457 }
458
459 void ConstantPoolCache::remove_resolved_method_entries_if_non_deterministic() {
460 ConstantPool* cp = constant_pool();
461 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
462 for (int i = 0; i < _resolved_method_entries->length(); i++) {
463 ResolvedMethodEntry* rme = _resolved_method_entries->adr_at(i);
464 int cp_index = rme->constant_pool_index();
465 bool archived = false;
466 bool resolved = rme->is_resolved(Bytecodes::_invokevirtual) ||
467 rme->is_resolved(Bytecodes::_invokespecial) ||
468 rme->is_resolved(Bytecodes::_invokeinterface) ||
469 rme->is_resolved(Bytecodes::_invokehandle);
470
471 // Just for safety -- this should not happen, but do not archive if we ever see this.
472 resolved &= !(rme->is_resolved(Bytecodes::_invokestatic));
473
474 if (resolved && can_archive_resolved_method(src_cp, rme)) {
475 rme->mark_and_relocate(src_cp);
476 archived = true;
477 } else {
478 rme->remove_unshareable_info();
479 }
480 if (resolved) {
481 LogStreamHandle(Trace, cds, resolve) log;
482 if (log.is_enabled()) {
483 ResourceMark rm;
484 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
485 Symbol* klass_name = cp->klass_name_at(klass_cp_index);
486 Symbol* name = cp->uncached_name_ref_at(cp_index);
487 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
488 log.print("%s%s method CP entry [%3d]: %s %s.%s:%s",
489 (archived ? "archived" : "reverted"),
490 (rme->is_resolved(Bytecodes::_invokeinterface) ? " interface" : ""),
491 cp_index,
492 cp->pool_holder()->name()->as_C_string(),
493 klass_name->as_C_string(), name->as_C_string(), signature->as_C_string());
494 if (archived) {
495 Klass* resolved_klass = cp->resolved_klass_at(klass_cp_index);
496 log.print(" => %s%s",
497 resolved_klass->name()->as_C_string(),
498 (rme->is_resolved(Bytecodes::_invokestatic) ? " *** static" : ""));
499 }
500 }
501 ArchiveBuilder::alloc_stats()->record_method_cp_entry(archived, resolved && !archived);
502 }
503 }
504 }
505
506 void ConstantPoolCache::remove_resolved_indy_entries_if_non_deterministic() {
507 ConstantPool* cp = constant_pool();
508 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
509 for (int i = 0; i < _resolved_indy_entries->length(); i++) {
510 ResolvedIndyEntry* rei = _resolved_indy_entries->adr_at(i);
511 int cp_index = rei->constant_pool_index();
512 bool archived = false;
513 bool resolved = rei->is_resolved();
514 if (resolved && AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) {
515 rei->mark_and_relocate();
516 archived = true;
517 } else {
518 rei->remove_unshareable_info();
519 }
520 if (resolved) {
521 LogStreamHandle(Trace, cds, resolve) log;
522 if (log.is_enabled()) {
523 ResourceMark rm;
524 int bsm = cp->bootstrap_method_ref_index_at(cp_index);
525 int bsm_ref = cp->method_handle_index_at(bsm);
526 Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref);
527 Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref);
528 Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref));
529 log.print("%s indy CP entry [%3d]: %s (%d)",
530 (archived ? "archived" : "reverted"),
531 cp_index, cp->pool_holder()->name()->as_C_string(), i);
532 log.print(" %s %s.%s:%s", (archived ? "=>" : " "), bsm_klass->as_C_string(),
533 bsm_name->as_C_string(), bsm_signature->as_C_string());
534 }
535 ArchiveBuilder::alloc_stats()->record_indy_cp_entry(archived, resolved && !archived);
536 }
537 }
538 }
539
540 bool ConstantPoolCache::can_archive_resolved_method(ConstantPool* src_cp, ResolvedMethodEntry* method_entry) {
541 InstanceKlass* pool_holder = constant_pool()->pool_holder();
542 if (!(pool_holder->is_shared_boot_class() || pool_holder->is_shared_platform_class() ||
543 pool_holder->is_shared_app_class())) {
544 // Archiving resolved cp entries for classes from non-builtin loaders
545 // is not yet supported.
546 return false;
547 }
548
549 if (CDSConfig::is_dumping_dynamic_archive()) {
550 // InstanceKlass::methods() has been resorted. We need to
551 // update the vtable_index in method_entry (not implemented)
552 return false;
553 }
554
555 if (!method_entry->is_resolved(Bytecodes::_invokevirtual)) {
556 if (method_entry->method() == nullptr) {
557 return false;
558 }
559 if (method_entry->method()->is_continuation_native_intrinsic()) {
560 return false; // FIXME: corresponding stub is generated on demand during method resolution (see LinkResolver::resolve_static_call).
561 }
562 }
563
564 int cp_index = method_entry->constant_pool_index();
565 assert(src_cp->tag_at(cp_index).is_method() || src_cp->tag_at(cp_index).is_interface_method(), "sanity");
566
567 if (!AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) {
568 return false;
569 }
570
571 if (method_entry->is_resolved(Bytecodes::_invokeinterface) ||
572 method_entry->is_resolved(Bytecodes::_invokevirtual) ||
573 method_entry->is_resolved(Bytecodes::_invokespecial)) {
574 return true;
575 } else if (method_entry->is_resolved(Bytecodes::_invokehandle)) {
576 if (CDSConfig::is_dumping_method_handles()) {
577 // invokehandle depends on archived MethodType and LambdaForms.
578 return true;
579 } else {
580 return false;
581 }
582 } else {
583 return false;
584 }
585 }
586 #endif // INCLUDE_CDS
587
588 void ConstantPoolCache::deallocate_contents(ClassLoaderData* data) {
589 assert(!is_shared(), "shared caches are not deallocated");
590 data->remove_handle(_resolved_references);
591 set_resolved_references(OopHandle());
592 MetadataFactory::free_array<u2>(data, _reference_map);
593 set_reference_map(nullptr);
594 #if INCLUDE_CDS
595 if (_resolved_indy_entries != nullptr) {
596 MetadataFactory::free_array<ResolvedIndyEntry>(data, _resolved_indy_entries);
597 _resolved_indy_entries = nullptr;
598 }
599 if (_resolved_field_entries != nullptr) {
600 MetadataFactory::free_array<ResolvedFieldEntry>(data, _resolved_field_entries);
601 _resolved_field_entries = nullptr;
602 }
603 if (_resolved_method_entries != nullptr) {
604 MetadataFactory::free_array<ResolvedMethodEntry>(data, _resolved_method_entries);
605 _resolved_method_entries = nullptr;
606 }
607 #endif
608 }
609
610 #if INCLUDE_CDS_JAVA_HEAP
611 oop ConstantPoolCache::archived_references() {
612 if (_archived_references_index < 0) {
613 return nullptr;
614 }
615 return HeapShared::get_root(_archived_references_index);
616 }
617
618 void ConstantPoolCache::clear_archived_references() {
619 if (_archived_references_index >= 0) {
620 HeapShared::clear_root(_archived_references_index);
621 _archived_references_index = -1;
622 }
623 }
624 #endif
625
626 #if INCLUDE_JVMTI
627 static void log_adjust(const char* entry_type, Method* old_method, Method* new_method, bool* trace_name_printed) {
628 ResourceMark rm;
629
630 if (!(*trace_name_printed)) {
631 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
632 *trace_name_printed = true;
633 }
634 log_trace(redefine, class, update, constantpool)
635 ("cpc %s entry update: %s", entry_type, new_method->external_name());
636 }
637
638 // RedefineClasses() API support:
639 // If any entry of this ConstantPoolCache points to any of
640 // old_methods, replace it with the corresponding new_method.
641 void ConstantPoolCache::adjust_method_entries(bool * trace_name_printed) {
642 if (_resolved_indy_entries != nullptr) {
643 for (int j = 0; j < _resolved_indy_entries->length(); j++) {
644 Method* old_method = resolved_indy_entry_at(j)->method();
645 if (old_method == nullptr || !old_method->is_old()) {
646 continue;
647 }
648 assert(!old_method->is_deleted(), "cannot delete these methods");
649 Method* new_method = old_method->get_new_method();
650 resolved_indy_entry_at(j)->adjust_method_entry(new_method);
651 log_adjust("indy", old_method, new_method, trace_name_printed);
652 }
653 }
654 if (_resolved_method_entries != nullptr) {
655 for (int i = 0; i < _resolved_method_entries->length(); i++) {
656 ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
657 // get interesting method entry
658 Method* old_method = method_entry->method();
659 if (old_method == nullptr || !old_method->is_old()) {
660 continue; // skip uninteresting entries
661 }
662 if (old_method->is_deleted()) {
663 // clean up entries with deleted methods
664 method_entry->reset_entry();
665 continue;
666 }
667 Method* new_method = old_method->get_new_method();
668 method_entry->adjust_method_entry(new_method);
669 log_adjust("non-indy", old_method, new_method, trace_name_printed);
670 }
671 }
672 }
673
674 // the constant pool cache should never contain old or obsolete methods
675 bool ConstantPoolCache::check_no_old_or_obsolete_entries() {
676 ResourceMark rm;
677 if (_resolved_indy_entries != nullptr) {
678 for (int i = 0; i < _resolved_indy_entries->length(); i++) {
679 Method* m = resolved_indy_entry_at(i)->method();
680 if (m != nullptr && !resolved_indy_entry_at(i)->check_no_old_or_obsolete_entry()) {
681 log_trace(redefine, class, update, constantpool)
682 ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
683 constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
684 return false;
685 }
686 }
687 }
688 if (_resolved_method_entries != nullptr) {
689 for (int i = 0; i < _resolved_method_entries->length(); i++) {
690 ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
691 Method* m = method_entry->method();
692 if (m != nullptr && !method_entry->check_no_old_or_obsolete_entry()) {
693 log_trace(redefine, class, update, constantpool)
694 ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
695 constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
696 return false;
697 }
698 }
699 }
700 return true;
701 }
702
703 void ConstantPoolCache::dump_cache() {
704 print_on(tty);
705 }
706 #endif // INCLUDE_JVMTI
707
708 void ConstantPoolCache::metaspace_pointers_do(MetaspaceClosure* it) {
709 log_trace(cds)("Iter(ConstantPoolCache): %p", this);
710 it->push(&_constant_pool);
711 it->push(&_reference_map);
712 if (_resolved_indy_entries != nullptr) {
713 it->push(&_resolved_indy_entries, MetaspaceClosure::_writable);
714 }
715 if (_resolved_field_entries != nullptr) {
716 it->push(&_resolved_field_entries, MetaspaceClosure::_writable);
717 }
718 if (_resolved_method_entries != nullptr) {
719 it->push(&_resolved_method_entries, MetaspaceClosure::_writable);
720 }
721 }
722
723 bool ConstantPoolCache::save_and_throw_indy_exc(
724 const constantPoolHandle& cpool, int cpool_index, int index, constantTag tag, TRAPS) {
725
726 assert(HAS_PENDING_EXCEPTION, "No exception got thrown!");
727 assert(PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass()),
728 "No LinkageError exception");
729
730 // Use the resolved_references() lock for this cpCache entry.
731 // resolved_references are created for all classes with Invokedynamic, MethodHandle
732 // or MethodType constant pool cache entries.
733 JavaThread* current = THREAD;
734 objArrayHandle resolved_references(current, cpool->resolved_references());
735 assert(resolved_references() != nullptr,
736 "a resolved_references array should have been created for this class");
737 ObjectLocker ol(resolved_references, current);
738
739 // if the indy_info is resolved or the indy_resolution_failed flag is set then another
740 // thread either succeeded in resolving the method or got a LinkageError
741 // exception, before this thread was able to record its failure. So, clear
742 // this thread's exception and return false so caller can use the earlier
743 // thread's result.
744 if (resolved_indy_entry_at(index)->is_resolved() || resolved_indy_entry_at(index)->resolution_failed()) {
745 CLEAR_PENDING_EXCEPTION;
746 return false;
747 }
748 ResourceMark rm(THREAD);
749 Symbol* error = PENDING_EXCEPTION->klass()->name();
750 const char* message = java_lang_Throwable::message_as_utf8(PENDING_EXCEPTION);
751
752 int encoded_index = ResolutionErrorTable::encode_indy_index(index);
753 SystemDictionary::add_resolution_error(cpool, encoded_index, error, message);
754 resolved_indy_entry_at(index)->set_resolution_failed();
755 return true;
756 }
757
758 oop ConstantPoolCache::set_dynamic_call(const CallInfo &call_info, int index) {
759 ResourceMark rm;
760
761 // Use the resolved_references() lock for this cpCache entry.
762 // resolved_references are created for all classes with Invokedynamic, MethodHandle
763 // or MethodType constant pool cache entries.
764 JavaThread* current = JavaThread::current();
765 constantPoolHandle cp(current, constant_pool());
766
767 objArrayHandle resolved_references(current, cp->resolved_references());
768 assert(resolved_references() != nullptr,
769 "a resolved_references array should have been created for this class");
770 ObjectLocker ol(resolved_references, current);
771 assert(index >= 0, "Indy index must be positive at this point");
772
773 if (resolved_indy_entry_at(index)->method() != nullptr) {
774 return cp->resolved_reference_from_indy(index);
775 }
776
777 if (resolved_indy_entry_at(index)->resolution_failed()) {
778 // Before we got here, another thread got a LinkageError exception during
779 // resolution. Ignore our success and throw their exception.
780 guarantee(index >= 0, "Invalid indy index");
781 int encoded_index = ResolutionErrorTable::encode_indy_index(index);
782 ConstantPool::throw_resolution_error(cp, encoded_index, current);
783 return nullptr;
784 }
785
786 Method* adapter = call_info.resolved_method();
787 const Handle appendix = call_info.resolved_appendix();
788 const bool has_appendix = appendix.not_null();
789
790 LogStream* log_stream = nullptr;
791 LogStreamHandle(Debug, methodhandles, indy) lsh_indy;
792 if (lsh_indy.is_enabled()) {
793 ResourceMark rm;
794 log_stream = &lsh_indy;
795 log_stream->print_cr("set_method_handle bc=%d appendix=" PTR_FORMAT "%s method=" PTR_FORMAT " (local signature) ",
796 0xba,
797 p2i(appendix()),
798 (has_appendix ? "" : " (unused)"),
799 p2i(adapter));
800 adapter->print_on(log_stream);
801 if (has_appendix) appendix()->print_on(log_stream);
802 }
803
804 if (has_appendix) {
805 const int appendix_index = resolved_indy_entry_at(index)->resolved_references_index();
806 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
807 assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
808 resolved_references->obj_at_put(appendix_index, appendix());
809 }
810
811 // Populate entry with resolved information
812 assert(resolved_indy_entries() != nullptr, "Invokedynamic array is empty, cannot fill with resolved information");
813 resolved_indy_entry_at(index)->fill_in(adapter, adapter->size_of_parameters(), as_TosState(adapter->result_type()), has_appendix);
814
815 if (log_stream != nullptr) {
816 resolved_indy_entry_at(index)->print_on(log_stream);
817 }
818 return appendix();
819 }
820
821 oop ConstantPoolCache::appendix_if_resolved(int method_index) const {
822 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
823 return appendix_if_resolved(method_entry);
824 }
825
826 oop ConstantPoolCache::appendix_if_resolved(ResolvedMethodEntry* method_entry) const {
827 if (!method_entry->has_appendix())
828 return nullptr;
829 const int ref_index = method_entry->resolved_references_index();
830 return constant_pool()->resolved_reference_at(ref_index);
831 }
832
833 // Printing
834
835 void ConstantPoolCache::print_on(outputStream* st) const {
836 st->print_cr("%s", internal_name());
837 // print constant pool cache entries
838 if (_resolved_field_entries != nullptr) {
839 print_resolved_field_entries(st);
840 }
841 if (_resolved_method_entries != nullptr) {
842 print_resolved_method_entries(st);
843 }
844 if (_resolved_indy_entries != nullptr) {
845 print_resolved_indy_entries(st);
846 }
847 }
848
849 void ConstantPoolCache::print_resolved_field_entries(outputStream* st) const {
850 for (int field_index = 0; field_index < resolved_field_entries_length(); field_index++) {
851 resolved_field_entry_at(field_index)->print_on(st);
852 }
853 }
854
855 void ConstantPoolCache::print_resolved_method_entries(outputStream* st) const {
856 for (int method_index = 0; method_index < resolved_method_entries_length(); method_index++) {
857 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
858 method_entry->print_on(st);
859 if (method_entry->has_appendix()) {
860 st->print(" appendix: ");
861 constant_pool()->resolved_reference_from_method(method_index)->print_on(st);
862 }
863 }
864 }
865
866 void ConstantPoolCache::print_resolved_indy_entries(outputStream* st) const {
867 for (int indy_index = 0; indy_index < resolved_indy_entries_length(); indy_index++) {
868 ResolvedIndyEntry* indy_entry = resolved_indy_entry_at(indy_index);
869 indy_entry->print_on(st);
870 if (indy_entry->has_appendix()) {
871 st->print(" appendix: ");
872 constant_pool()->resolved_reference_from_indy(indy_index)->print_on(st);
873 }
874 }
875 }