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/classPrelinker.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/method.inline.hpp"
52 #include "oops/resolvedFieldEntry.hpp"
53 #include "oops/resolvedIndyEntry.hpp"
54 #include "oops/resolvedMethodEntry.hpp"
55 #include "prims/methodHandles.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/atomic.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/mutexLocker.hpp"
60 #include "runtime/synchronizer.hpp"
61 #include "runtime/vm_version.hpp"
62 #include "utilities/macros.hpp"
63
64 // Implementation of ConstantPoolCache
65
66 template <class T>
67 static Array<T>* initialize_resolved_entries_array(ClassLoaderData* loader_data, GrowableArray<T> entries, TRAPS) {
68 Array<T>* resolved_entries;
69 if (entries.length() != 0) {
70 resolved_entries = MetadataFactory::new_array<T>(loader_data, entries.length(), CHECK_NULL);
71 for (int i = 0; i < entries.length(); i++) {
72 resolved_entries->at_put(i, entries.at(i));
73 }
74 return resolved_entries;
75 }
76 return nullptr;
77 }
78
79 void ConstantPoolCache::set_direct_or_vtable_call(Bytecodes::Code invoke_code,
80 int method_index,
81 const methodHandle& method,
82 int vtable_index,
83 bool sender_is_interface) {
84 bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean
85 assert(method->interpreter_entry() != nullptr, "should have been set at this point");
86 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
87
88 int byte_no = -1;
89 bool change_to_virtual = false;
90 InstanceKlass* holder = nullptr; // have to declare this outside the switch
91 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
92 switch (invoke_code) {
93 case Bytecodes::_invokeinterface:
94 holder = method->method_holder();
95 // check for private interface method invocations
96 if (vtable_index == Method::nonvirtual_vtable_index && holder->is_interface() ) {
97 assert(method->is_private(), "unexpected non-private method");
98 assert(method->can_be_statically_bound(), "unexpected non-statically-bound method");
99
100 method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) |
101 ((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift));
102 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
103 assert(method_entry->is_vfinal(), "flags must be set");
104 method_entry->set_method(method());
105 byte_no = 2;
106 method_entry->set_klass(holder);
107 break;
108 }
109 else {
110 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface
111 // instruction links to a non-interface method (in Object). This can happen when
112 // an interface redeclares an Object method (like CharSequence declaring toString())
113 // or when invokeinterface is used explicitly.
114 // In that case, the method has no itable index and must be invoked as a virtual.
115 // Set a flag to keep track of this corner case.
116 assert(holder->is_interface() || holder == vmClasses::Object_klass(), "unexpected holder class");
117 assert(method->is_public(), "Calling non-public method in Object with invokeinterface");
118 change_to_virtual = true;
119
120 // ...and fall through as if we were handling invokevirtual:
121 }
122 case Bytecodes::_invokevirtual:
123 {
124 if (!is_vtable_call) {
125 assert(method->can_be_statically_bound(), "");
126 method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) |
127 ((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift) |
128 ((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift));
129 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
130 assert(method_entry->is_vfinal(), "flags must be set");
131 method_entry->set_method(method());
132 } else {
133 assert(!method->can_be_statically_bound(), "");
134 assert(vtable_index >= 0, "valid index");
135 assert(!method->is_final_method(), "sanity");
136 method_entry->set_flags((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift);
137 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
138 assert(!method_entry->is_vfinal(), "flags must not be set");
139 method_entry->set_table_index(vtable_index);
140 }
141 byte_no = 2;
142 break;
143 }
144
145 case Bytecodes::_invokespecial:
146 case Bytecodes::_invokestatic: {
147 assert(!is_vtable_call, "");
148 // Note: Read and preserve the value of the is_vfinal flag on any
149 // invokevirtual bytecode shared with this constant pool cache entry.
150 // It is cheap and safe to consult is_vfinal() at all times.
151 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
152 bool vfinal = method_entry->is_vfinal();
153 method_entry->set_flags(((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift));
154 assert(vfinal == method_entry->is_vfinal(), "Vfinal flag must be preserved");
155 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
156 method_entry->set_method(method());
157 byte_no = 1;
158 break;
159 }
160 default:
161 ShouldNotReachHere();
162 break;
163 }
164
165 // Note: byte_no also appears in TemplateTable::resolve.
166 if (byte_no == 1) {
167 assert(invoke_code != Bytecodes::_invokevirtual &&
168 invoke_code != Bytecodes::_invokeinterface, "");
169 bool do_resolve = true;
170 // Don't mark invokespecial to method as resolved if sender is an interface. The receiver
171 // has to be checked that it is a subclass of the current class every time this bytecode
172 // is executed.
173 if (invoke_code == Bytecodes::_invokespecial && sender_is_interface &&
174 method->name() != vmSymbols::object_initializer_name()) {
175 do_resolve = false;
176 }
177 if (invoke_code == Bytecodes::_invokestatic) {
178 assert(method->method_holder()->is_initialized() ||
179 method->method_holder()->is_reentrant_initialization(JavaThread::current()) ||
180 (CDSConfig::is_dumping_archive() && VM_Version::supports_fast_class_init_checks()),
181 "invalid class initialization state for invoke_static");
182
183 if (!VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
184 // Don't mark invokestatic to method as resolved if the holder class has not yet completed
185 // initialization. An invokestatic must only proceed if the class is initialized, but if
186 // we resolve it before then that class initialization check is skipped.
187 //
188 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
189 // template interpreter supports fast class initialization check for
190 // invokestatic which doesn't require call site re-resolution to
191 // enforce class initialization barrier.
192 do_resolve = false;
193 }
194 }
195 if (do_resolve) {
196 method_entry->set_bytecode1(invoke_code);
197 }
198 } else if (byte_no == 2) {
199 if (change_to_virtual) {
200 assert(invoke_code == Bytecodes::_invokeinterface, "");
201 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!!
202 //
203 // Workaround for the case where we encounter an invokeinterface, but we
204 // should really have an _invokevirtual since the resolved method is a
205 // virtual method in java.lang.Object. This is a corner case in the spec
206 // but is presumably legal. javac does not generate this code.
207 //
208 // We do not set bytecode_1() to _invokeinterface, because that is the
209 // bytecode # used by the interpreter to see if it is resolved. In this
210 // case, the method gets reresolved with caller for each interface call
211 // because the actual selected method may not be public.
212 //
213 // We set bytecode_2() to _invokevirtual.
214 // See also interpreterRuntime.cpp. (8/25/2000)
215 } else {
216 assert(invoke_code == Bytecodes::_invokevirtual ||
217 (invoke_code == Bytecodes::_invokeinterface &&
218 ((method->is_private() ||
219 (method->is_final() && method->method_holder() == vmClasses::Object_klass())))),
220 "unexpected invocation mode");
221 if (invoke_code == Bytecodes::_invokeinterface &&
222 (method->is_private() || method->is_final())) {
223 // We set bytecode_1() to _invokeinterface, because that is the
224 // bytecode # used by the interpreter to see if it is resolved.
225 // We set bytecode_2() to _invokevirtual.
226 method_entry->set_bytecode1(invoke_code);
227 }
228 }
229 // set up for invokevirtual, even if linking for invokeinterface also:
230 method_entry->set_bytecode2(Bytecodes::_invokevirtual);
231 } else {
232 ShouldNotReachHere();
233 }
234 }
235
236 void ConstantPoolCache::set_direct_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method,
237 bool sender_is_interface) {
238 int index = Method::nonvirtual_vtable_index;
239 // index < 0; FIXME: inline and customize set_direct_or_vtable_call
240 set_direct_or_vtable_call(invoke_code, method_index, method, index, sender_is_interface);
241 }
242
243 void ConstantPoolCache::set_vtable_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method, int index) {
244 // either the method is a miranda or its holder should accept the given index
245 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), "");
246 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call
247 set_direct_or_vtable_call(invoke_code, method_index, method, index, false);
248 }
249
250 void ConstantPoolCache::set_itable_call(Bytecodes::Code invoke_code,
251 int method_index,
252 Klass* referenced_klass,
253 const methodHandle& method, int index) {
254 assert(method->method_holder()->verify_itable_index(index), "");
255 assert(invoke_code == Bytecodes::_invokeinterface, "");
256 InstanceKlass* interf = method->method_holder();
257 assert(interf->is_interface(), "must be an interface");
258 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here");
259 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
260 method_entry->set_klass(static_cast<InstanceKlass*>(referenced_klass));
261 method_entry->set_method(method());
262 method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
263 method_entry->set_bytecode1(Bytecodes::_invokeinterface);
264 }
265
266 ResolvedMethodEntry* ConstantPoolCache::set_method_handle(int method_index, const CallInfo &call_info) {
267 // NOTE: This method entry can be the subject of data races.
268 // There are three words to update: flags, refs[appendix_index], method (in that order).
269 // Writers must store all other values before method.
270 // Readers must test the method first for non-null before reading other fields.
271 // Competing writers must acquire exclusive access via a lock.
272 // A losing writer waits on the lock until the winner writes the method and leaves
273 // the lock, so that when the losing writer returns, he can use the linked
274 // cache entry.
275
276 // Lock fields to write
277 Bytecodes::Code invoke_code = Bytecodes::_invokehandle;
278
279 JavaThread* current = JavaThread::current();
280 objArrayHandle resolved_references(current, constant_pool()->resolved_references());
281 // Use the resolved_references() lock for this cpCache entry.
282 // resolved_references are created for all classes with Invokedynamic, MethodHandle
283 // or MethodType constant pool cache entries.
284 assert(resolved_references() != nullptr,
285 "a resolved_references array should have been created for this class");
286 ObjectLocker ol(resolved_references, current);
287
288 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
289 if (method_entry->is_resolved(invoke_code)) {
290 return method_entry;
291 }
292
293 Method* adapter = call_info.resolved_method();
294 const Handle appendix = call_info.resolved_appendix();
295 const bool has_appendix = appendix.not_null();
296
297 // Write the flags.
298 // MHs are always sig-poly and have a local signature.
299 method_entry->fill_in((u1)as_TosState(adapter->result_type()), (u2)adapter->size_of_parameters());
300 method_entry->set_flags(((has_appendix ? 1 : 0) << ResolvedMethodEntry::has_appendix_shift ) |
301 ( 1 << ResolvedMethodEntry::has_local_signature_shift ) |
302 ( 1 << ResolvedMethodEntry::is_final_shift ));
303
304 // Method handle invokes use both a method and a resolved references index.
305 // refs[appendix_index], if not null, contains a value passed as a trailing argument to the adapter.
306 // In the general case, this could be the call site's MethodType,
307 // for use with java.lang.Invokers.checkExactType, or else a CallSite object.
308 // method_entry->method() contains the adapter method which manages the actual call.
309 // In the general case, this is a compiled LambdaForm.
310 // (The Java code is free to optimize these calls by binding other
311 // sorts of methods and appendices to call sites.)
312 // JVM-level linking is via the method, as if for invokespecial, and signatures are erased.
313 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits.
314 // Even with the appendix, the method will never take more than 255 parameter slots.
315 //
316 // This means that given a call site like (List)mh.invoke("foo"),
317 // the method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;',
318 // not '(Ljava/lang/String;)Ljava/util/List;'.
319 // The fact that String and List are involved is encoded in the MethodType in refs[appendix_index].
320 // This allows us to create fewer Methods, while keeping type safety.
321 //
322
323 // Store appendix, if any.
324 if (has_appendix) {
325 const int appendix_index = method_entry->resolved_references_index();
326 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
327 assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
328 resolved_references->obj_at_put(appendix_index, appendix());
329 }
330
331 method_entry->set_method(adapter); // This must be the last one to set (see NOTE above)!
332
333 // The interpreter assembly code does not check byte_2,
334 // but it is used by is_resolved, method_if_resolved, etc.
335 method_entry->set_bytecode1(invoke_code);
336
337 assert(has_appendix == method_entry->has_appendix(), "proper storage of appendix flag");
338 assert(method_entry->has_local_signature(), "proper storage of signature flag");
339 return method_entry;
340 }
341
342 Method* ConstantPoolCache::method_if_resolved(int method_index) const {
343 // Decode the action of set_method and set_interface_call
344 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
345
346 Bytecodes::Code invoke_code = (Bytecodes::Code)method_entry->bytecode1();
347 switch (invoke_code) {
348 case Bytecodes::_invokeinterface:
349 case Bytecodes::_invokestatic:
350 case Bytecodes::_invokespecial:
351 assert(!method_entry->has_appendix(), "");
352 // fall through
353 case Bytecodes::_invokehandle:
354 return method_entry->method();
355 case Bytecodes::_invokedynamic:
356 ShouldNotReachHere();
357 default:
358 assert(invoke_code == (Bytecodes::Code)0, "unexpected bytecode");
359 break;
360 }
361
362 invoke_code = (Bytecodes::Code)method_entry->bytecode2();
363 if (invoke_code == Bytecodes::_invokevirtual) {
364 if (method_entry->is_vfinal()) {
365 return method_entry->method();
366 } else {
367 int holder_index = constant_pool()->uncached_klass_ref_index_at(method_entry->constant_pool_index());
368 if (constant_pool()->tag_at(holder_index).is_klass()) {
369 Klass* klass = constant_pool()->resolved_klass_at(holder_index);
370 return klass->method_at_vtable(method_entry->table_index());
371 }
372 }
373 }
374 return nullptr;
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 #if INCLUDE_CDS
401 void ConstantPoolCache::remove_unshareable_info() {
402 assert(CDSConfig::is_dumping_archive(), "sanity");
403
404 if (_resolved_indy_entries != nullptr) {
405 remove_resolved_indy_entries_if_non_deterministic();
406 }
407 if (_resolved_field_entries != nullptr) {
408 remove_resolved_field_entries_if_non_deterministic();
409 }
410 if (_resolved_method_entries != nullptr) {
411 remove_resolved_method_entries_if_non_deterministic();
412 }
413 }
414
415 void ConstantPoolCache::remove_resolved_field_entries_if_non_deterministic() {
416 ConstantPool* cp = constant_pool();
417 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
418 for (int i = 0; i < _resolved_field_entries->length(); i++) {
419 ResolvedFieldEntry* rfi = _resolved_field_entries->adr_at(i);
420 int cp_index = rfi->constant_pool_index();
421 bool archived = false;
422 bool resolved = rfi->is_resolved(Bytecodes::_getstatic) ||
423 rfi->is_resolved(Bytecodes::_putstatic) ||
424 rfi->is_resolved(Bytecodes::_getfield) ||
425 rfi->is_resolved(Bytecodes::_putfield);
426 if (resolved && ClassPrelinker::is_resolution_deterministic(src_cp, cp_index)) {
427 rfi->mark_and_relocate();
428 archived = true;
429 } else {
430 rfi->remove_unshareable_info();
431 }
432 if (resolved) {
433 LogStreamHandle(Trace, cds, resolve) log;
434 if (log.is_enabled()) {
435 ResourceMark rm;
436 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
437 Symbol* klass_name = cp->klass_name_at(klass_cp_index);
438 Symbol* name = cp->uncached_name_ref_at(cp_index);
439 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
440 log.print("%s field CP entry [%3d]: %s %s %s.%s:%s",
441 (archived ? "archived" : "reverted"),
442 cp_index,
443 cp->pool_holder()->name()->as_C_string(),
444 (archived ? "=>" : " "),
445 klass_name->as_C_string(), name->as_C_string(), signature->as_C_string());
446 }
447 }
448 ArchiveBuilder::alloc_stats()->record_field_cp_entry(archived, resolved && !archived);
449 }
450 }
451
452 void ConstantPoolCache::remove_resolved_method_entries_if_non_deterministic() {
453 ConstantPool* cp = constant_pool();
454 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
455 for (int i = 0; i < _resolved_method_entries->length(); i++) {
456 ResolvedMethodEntry* rme = _resolved_method_entries->adr_at(i);
457 int cp_index = rme->constant_pool_index();
458 bool archived = false;
459 bool resolved = rme->is_resolved(Bytecodes::_invokevirtual) ||
460 rme->is_resolved(Bytecodes::_invokespecial) ||
461 rme->is_resolved(Bytecodes::_invokestatic) ||
462 rme->is_resolved(Bytecodes::_invokeinterface) ||
463 rme->is_resolved(Bytecodes::_invokehandle);
464 if (resolved && can_archive_resolved_method(src_cp, rme)) {
465 rme->mark_and_relocate(src_cp);
466 archived = true;
467 } else {
468 rme->remove_unshareable_info();
469 }
470 if (resolved) {
471 LogStreamHandle(Trace, cds, resolve) log;
472 if (log.is_enabled()) {
473 ResourceMark rm;
474 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
475 Symbol* klass_name = cp->klass_name_at(klass_cp_index);
476 Symbol* name = cp->uncached_name_ref_at(cp_index);
477 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
478 log.print("%s%s method CP entry [%3d]: %s %s.%s:%s",
479 (archived ? "archived" : "reverted"),
480 (rme->is_resolved(Bytecodes::_invokeinterface) ? " interface" : ""),
481 cp_index,
482 cp->pool_holder()->name()->as_C_string(),
483 klass_name->as_C_string(), name->as_C_string(), signature->as_C_string());
484 if (archived) {
485 Klass* resolved_klass = cp->resolved_klass_at(klass_cp_index);
486 log.print(" => %s%s",
487 resolved_klass->name()->as_C_string(),
488 (rme->is_resolved(Bytecodes::_invokestatic) ? " *** static" : ""));
489 }
490 }
491 ArchiveBuilder::alloc_stats()->record_method_cp_entry(archived, resolved && !archived);
492 }
493 }
494 }
495
496 void ConstantPoolCache::remove_resolved_indy_entries_if_non_deterministic() {
497 ConstantPool* cp = constant_pool();
498 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
499 for (int i = 0; i < _resolved_indy_entries->length(); i++) {
500 ResolvedIndyEntry* rei = _resolved_indy_entries->adr_at(i);
501 int cp_index = rei->constant_pool_index();
502 bool archived = false;
503 bool resolved = rei->is_resolved();
504 if (resolved && ClassPrelinker::is_resolution_deterministic(src_cp, cp_index)) {
505 rei->mark_and_relocate();
506 archived = true;
507 } else {
508 rei->remove_unshareable_info();
509 }
510 if (resolved) {
511 LogStreamHandle(Trace, cds, resolve) log;
512 if (log.is_enabled()) {
513 ResourceMark rm;
514 int bsm = cp->bootstrap_method_ref_index_at(cp_index);
515 int bsm_ref = cp->method_handle_index_at(bsm);
516 Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref);
517 Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref);
518 Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref));
519 log.print("%s indy CP entry [%3d]: %s (%d)",
520 (archived ? "archived" : "reverted"),
521 cp_index, cp->pool_holder()->name()->as_C_string(), i);
522 log.print(" %s %s.%s:%s", (archived ? "=>" : " "), bsm_klass->as_C_string(),
523 bsm_name->as_C_string(), bsm_signature->as_C_string());
524 }
525 ArchiveBuilder::alloc_stats()->record_indy_cp_entry(archived, resolved && !archived);
526 }
527 }
528 }
529
530 bool ConstantPoolCache::can_archive_invokehandle(ResolvedMethodEntry* rme) {
531 ConstantPool* cp = constant_pool();
532 assert(rme->is_resolved(Bytecodes::_invokehandle), "sanity");
533
534 int cp_index = rme->constant_pool_index();
535 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
536 Klass* resolved_klass = cp->resolved_klass_at(klass_cp_index);
537 if (!resolved_klass->is_instance_klass()) {
538 // FIXME: can this ever happen?
539 return false;
540 }
541 // FIXME -- any class referenced by the archived CP entries should be added to ArchiveBuilder::classes, or should be
542 // filtered out.
543 return true;
544 }
545
546 bool ConstantPoolCache::can_archive_resolved_method(ConstantPool* src_cp, ResolvedMethodEntry* method_entry) {
547 InstanceKlass* pool_holder = constant_pool()->pool_holder();
548 if (!(pool_holder->is_shared_boot_class() || pool_holder->is_shared_platform_class() ||
549 pool_holder->is_shared_app_class())) {
550 // Archiving resolved cp entries for classes from non-builtin loaders
551 // is not yet supported.
552 return false;
553 }
554
555 if (CDSConfig::is_dumping_dynamic_archive()) {
556 // InstanceKlass::methods() has been resorted. We need to
557 // update the vtable_index in method_entry (not implemented)
558 return false;
559 }
560
561 if (!method_entry->is_resolved(Bytecodes::_invokevirtual)) {
562 if (method_entry->method() == nullptr) {
563 return false;
564 }
565 if (method_entry->method()->is_continuation_native_intrinsic()) {
566 return false; // FIXME: corresponding stub is generated on demand during method resolution (see LinkResolver::resolve_static_call).
567 }
568 }
569
570 int cp_index = method_entry->constant_pool_index();
571 assert(src_cp->tag_at(cp_index).is_method() || src_cp->tag_at(cp_index).is_interface_method(), "sanity");
572
573 if (!ClassPrelinker::is_resolution_deterministic(src_cp, cp_index)) {
574 return false;
575 }
576
577 if (method_entry->is_resolved(Bytecodes::_invokestatic) ||
578 method_entry->is_resolved(Bytecodes::_invokeinterface) ||
579 method_entry->is_resolved(Bytecodes::_invokevirtual) ||
580 method_entry->is_resolved(Bytecodes::_invokespecial)) {
581 return true;
582 } else if (method_entry->is_resolved(Bytecodes::_invokehandle)) {
583 if (CDSConfig::is_dumping_invokedynamic() && can_archive_invokehandle(method_entry)) {
584 // invokehandle depends on archived MethodType and LambdaForms.
585 return true;
586 } else {
587 return false;
588 }
589 } else {
590 return false;
591 }
592 }
593 #endif // INCLUDE_CDS
594
595 void ConstantPoolCache::deallocate_contents(ClassLoaderData* data) {
596 assert(!is_shared(), "shared caches are not deallocated");
597 data->remove_handle(_resolved_references);
598 set_resolved_references(OopHandle());
599 MetadataFactory::free_array<u2>(data, _reference_map);
600 set_reference_map(nullptr);
601 #if INCLUDE_CDS
602 if (_resolved_indy_entries != nullptr) {
603 MetadataFactory::free_array<ResolvedIndyEntry>(data, _resolved_indy_entries);
604 _resolved_indy_entries = nullptr;
605 }
606 if (_resolved_field_entries != nullptr) {
607 MetadataFactory::free_array<ResolvedFieldEntry>(data, _resolved_field_entries);
608 _resolved_field_entries = nullptr;
609 }
610 if (_resolved_method_entries != nullptr) {
611 MetadataFactory::free_array<ResolvedMethodEntry>(data, _resolved_method_entries);
612 _resolved_method_entries = nullptr;
613 }
614 #endif
615 }
616
617 #if INCLUDE_CDS_JAVA_HEAP
618 oop ConstantPoolCache::archived_references() {
619 if (_archived_references_index < 0) {
620 return nullptr;
621 }
622 return HeapShared::get_root(_archived_references_index);
623 }
624
625 void ConstantPoolCache::clear_archived_references() {
626 if (_archived_references_index >= 0) {
627 HeapShared::clear_root(_archived_references_index);
628 _archived_references_index = -1;
629 }
630 }
631
632 void ConstantPoolCache::set_archived_references(int root_index) {
633 assert(CDSConfig::is_dumping_heap(), "sanity");
634 _archived_references_index = root_index;
635 }
636 #endif
637
638 #if INCLUDE_JVMTI
639 static void log_adjust(const char* entry_type, Method* old_method, Method* new_method, bool* trace_name_printed) {
640 ResourceMark rm;
641
642 if (!(*trace_name_printed)) {
643 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
644 *trace_name_printed = true;
645 }
646 log_trace(redefine, class, update, constantpool)
647 ("cpc %s entry update: %s", entry_type, new_method->external_name());
648 }
649
650 // RedefineClasses() API support:
651 // If any entry of this ConstantPoolCache points to any of
652 // old_methods, replace it with the corresponding new_method.
653 void ConstantPoolCache::adjust_method_entries(bool * trace_name_printed) {
654 if (_resolved_indy_entries != nullptr) {
655 for (int j = 0; j < _resolved_indy_entries->length(); j++) {
656 Method* old_method = resolved_indy_entry_at(j)->method();
657 if (old_method == nullptr || !old_method->is_old()) {
658 continue;
659 }
660 Method* new_method = old_method->get_new_method();
661 resolved_indy_entry_at(j)->adjust_method_entry(new_method);
662 log_adjust("indy", old_method, new_method, trace_name_printed);
663 }
664 }
665 if (_resolved_method_entries != nullptr) {
666 for (int i = 0; i < _resolved_method_entries->length(); i++) {
667 ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
668 // get interesting method entry
669 Method* old_method = method_entry->method();
670 if (old_method == nullptr || !old_method->is_old()) {
671 continue; // skip uninteresting entries
672 }
673 if (old_method->is_deleted()) {
674 // clean up entries with deleted methods
675 method_entry->reset_entry();
676 continue;
677 }
678 Method* new_method = old_method->get_new_method();
679 method_entry->adjust_method_entry(new_method);
680 log_adjust("non-indy", old_method, new_method, trace_name_printed);
681 }
682 }
683 }
684
685 // the constant pool cache should never contain old or obsolete methods
686 bool ConstantPoolCache::check_no_old_or_obsolete_entries() {
687 ResourceMark rm;
688 if (_resolved_indy_entries != nullptr) {
689 for (int i = 0; i < _resolved_indy_entries->length(); i++) {
690 Method* m = resolved_indy_entry_at(i)->method();
691 if (m != nullptr && !resolved_indy_entry_at(i)->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 if (_resolved_method_entries != nullptr) {
700 for (int i = 0; i < _resolved_method_entries->length(); i++) {
701 ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
702 Method* m = method_entry->method();
703 if (m != nullptr && !method_entry->check_no_old_or_obsolete_entry()) {
704 log_trace(redefine, class, update, constantpool)
705 ("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
706 constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
707 return false;
708 }
709 }
710 }
711 return true;
712 }
713
714 void ConstantPoolCache::dump_cache() {
715 print_on(tty);
716 }
717 #endif // INCLUDE_JVMTI
718
719 void ConstantPoolCache::metaspace_pointers_do(MetaspaceClosure* it) {
720 log_trace(cds)("Iter(ConstantPoolCache): %p", this);
721 it->push(&_constant_pool);
722 it->push(&_reference_map);
723 if (_resolved_indy_entries != nullptr) {
724 it->push(&_resolved_indy_entries, MetaspaceClosure::_writable);
725 }
726 if (_resolved_field_entries != nullptr) {
727 it->push(&_resolved_field_entries, MetaspaceClosure::_writable);
728 }
729 if (_resolved_method_entries != nullptr) {
730 it->push(&_resolved_method_entries, MetaspaceClosure::_writable);
731 }
732 }
733
734 bool ConstantPoolCache::save_and_throw_indy_exc(
735 const constantPoolHandle& cpool, int cpool_index, int index, constantTag tag, TRAPS) {
736
737 assert(HAS_PENDING_EXCEPTION, "No exception got thrown!");
738 assert(PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass()),
739 "No LinkageError exception");
740
741 // Use the resolved_references() lock for this cpCache entry.
742 // resolved_references are created for all classes with Invokedynamic, MethodHandle
743 // or MethodType constant pool cache entries.
744 JavaThread* current = THREAD;
745 objArrayHandle resolved_references(current, cpool->resolved_references());
746 assert(resolved_references() != nullptr,
747 "a resolved_references array should have been created for this class");
748 ObjectLocker ol(resolved_references, current);
749
750 // if the indy_info is resolved or the indy_resolution_failed flag is set then another
751 // thread either succeeded in resolving the method or got a LinkageError
752 // exception, before this thread was able to record its failure. So, clear
753 // this thread's exception and return false so caller can use the earlier
754 // thread's result.
755 if (resolved_indy_entry_at(index)->is_resolved() || resolved_indy_entry_at(index)->resolution_failed()) {
756 CLEAR_PENDING_EXCEPTION;
757 return false;
758 }
759 ResourceMark rm(THREAD);
760 Symbol* error = PENDING_EXCEPTION->klass()->name();
761 const char* message = java_lang_Throwable::message_as_utf8(PENDING_EXCEPTION);
762
763 int encoded_index = ResolutionErrorTable::encode_indy_index(index);
764 SystemDictionary::add_resolution_error(cpool, encoded_index, error, message);
765 resolved_indy_entry_at(index)->set_resolution_failed();
766 return true;
767 }
768
769 oop ConstantPoolCache::set_dynamic_call(const CallInfo &call_info, int index) {
770 ResourceMark rm;
771
772 // Use the resolved_references() lock for this cpCache entry.
773 // resolved_references are created for all classes with Invokedynamic, MethodHandle
774 // or MethodType constant pool cache entries.
775 JavaThread* current = JavaThread::current();
776 constantPoolHandle cp(current, constant_pool());
777
778 objArrayHandle resolved_references(current, cp->resolved_references());
779 assert(resolved_references() != nullptr,
780 "a resolved_references array should have been created for this class");
781 ObjectLocker ol(resolved_references, current);
782 assert(index >= 0, "Indy index must be positive at this point");
783
784 if (resolved_indy_entry_at(index)->method() != nullptr) {
785 return cp->resolved_reference_from_indy(index);
786 }
787
788 if (resolved_indy_entry_at(index)->resolution_failed()) {
789 // Before we got here, another thread got a LinkageError exception during
790 // resolution. Ignore our success and throw their exception.
791 guarantee(index >= 0, "Invalid indy index");
792 int encoded_index = ResolutionErrorTable::encode_indy_index(index);
793 ConstantPool::throw_resolution_error(cp, encoded_index, current);
794 return nullptr;
795 }
796
797 Method* adapter = call_info.resolved_method();
798 const Handle appendix = call_info.resolved_appendix();
799 const bool has_appendix = appendix.not_null();
800
801 LogStream* log_stream = nullptr;
802 LogStreamHandle(Debug, methodhandles, indy) lsh_indy;
803 if (lsh_indy.is_enabled()) {
804 ResourceMark rm;
805 log_stream = &lsh_indy;
806 log_stream->print_cr("set_method_handle bc=%d appendix=" PTR_FORMAT "%s method=" PTR_FORMAT " (local signature) ",
807 0xba,
808 p2i(appendix()),
809 (has_appendix ? "" : " (unused)"),
810 p2i(adapter));
811 adapter->print_on(log_stream);
812 if (has_appendix) appendix()->print_on(log_stream);
813 }
814
815 if (has_appendix) {
816 const int appendix_index = resolved_indy_entry_at(index)->resolved_references_index();
817 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
818 assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
819 resolved_references->obj_at_put(appendix_index, appendix());
820 }
821
822 // Populate entry with resolved information
823 assert(resolved_indy_entries() != nullptr, "Invokedynamic array is empty, cannot fill with resolved information");
824 resolved_indy_entry_at(index)->fill_in(adapter, adapter->size_of_parameters(), as_TosState(adapter->result_type()), has_appendix);
825
826 if (log_stream != nullptr) {
827 resolved_indy_entry_at(index)->print_on(log_stream);
828 }
829 return appendix();
830 }
831
832 oop ConstantPoolCache::appendix_if_resolved(int method_index) const {
833 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
834 return appendix_if_resolved(method_entry);
835 }
836
837 oop ConstantPoolCache::appendix_if_resolved(ResolvedMethodEntry* method_entry) const {
838 if (!method_entry->has_appendix())
839 return nullptr;
840 const int ref_index = method_entry->resolved_references_index();
841 return constant_pool()->resolved_reference_at(ref_index);
842 }
843
844 // Printing
845
846 void ConstantPoolCache::print_on(outputStream* st) const {
847 st->print_cr("%s", internal_name());
848 // print constant pool cache entries
849 print_resolved_field_entries(st);
850 print_resolved_method_entries(st);
851 print_resolved_indy_entries(st);
852 }
853
854 void ConstantPoolCache::print_resolved_field_entries(outputStream* st) const {
855 for (int field_index = 0; field_index < resolved_field_entries_length(); field_index++) {
856 resolved_field_entry_at(field_index)->print_on(st);
857 }
858 }
859
860 void ConstantPoolCache::print_resolved_method_entries(outputStream* st) const {
861 for (int method_index = 0; method_index < resolved_method_entries_length(); method_index++) {
862 ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
863 method_entry->print_on(st);
864 if (method_entry->has_appendix()) {
865 st->print(" appendix: ");
866 constant_pool()->resolved_reference_from_method(method_index)->print_on(st);
867 }
868 }
869 }
870
871 void ConstantPoolCache::print_resolved_indy_entries(outputStream* st) const {
872 for (int indy_index = 0; indy_index < resolved_indy_entries_length(); indy_index++) {
873 ResolvedIndyEntry* indy_entry = resolved_indy_entry_at(indy_index);
874 indy_entry->print_on(st);
875 if (indy_entry->has_appendix()) {
876 st->print(" appendix: ");
877 constant_pool()->resolved_reference_from_indy(indy_index)->print_on(st);
878 }
879 }
880 }