1 /*
2 * Copyright (c) 1997, 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/aotMetaspace.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "cds/cppVtables.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderDataGraph.hpp"
30 #include "classfile/metadataOnStackMark.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmClasses.hpp"
34 #include "code/aotCodeCache.hpp"
35 #include "code/codeCache.hpp"
36 #include "code/debugInfoRec.hpp"
37 #include "compiler/compilationPolicy.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecodes.hpp"
40 #include "interpreter/bytecodeStream.hpp"
41 #include "interpreter/bytecodeTracer.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "logging/logTag.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/metadataFactory.hpp"
49 #include "memory/metaspaceClosure.hpp"
50 #include "memory/oopFactory.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "memory/universe.hpp"
53 #include "nmt/memTracker.hpp"
54 #include "oops/constantPool.hpp"
55 #include "oops/constMethod.hpp"
56 #include "oops/inlineKlass.inline.hpp"
57 #include "oops/jmethodIDTable.hpp"
58 #include "oops/klass.inline.hpp"
59 #include "oops/method.inline.hpp"
60 #include "oops/methodData.hpp"
61 #include "oops/objArrayKlass.hpp"
62 #include "oops/objArrayOop.inline.hpp"
63 #include "oops/oop.inline.hpp"
64 #include "oops/symbol.hpp"
65 #include "oops/trainingData.hpp"
66 #include "prims/jvmtiExport.hpp"
67 #include "prims/methodHandles.hpp"
68 #include "runtime/arguments.hpp"
69 #include "runtime/atomicAccess.hpp"
70 #include "runtime/continuationEntry.hpp"
71 #include "runtime/frame.inline.hpp"
72 #include "runtime/handles.inline.hpp"
73 #include "runtime/init.hpp"
74 #include "runtime/java.hpp"
75 #include "runtime/orderAccess.hpp"
76 #include "runtime/perfData.hpp"
77 #include "runtime/relocator.hpp"
78 #include "runtime/safepointVerifiers.hpp"
79 #include "runtime/sharedRuntime.hpp"
80 #include "runtime/signature.hpp"
81 #include "runtime/threads.hpp"
82 #include "runtime/vm_version.hpp"
83 #include "utilities/align.hpp"
84 #include "utilities/quickSort.hpp"
85 #include "utilities/vmError.hpp"
86 #include "utilities/xmlstream.hpp"
87
88 // Implementation of Method
89
90 Method* Method::allocate(ClassLoaderData* loader_data,
91 int byte_code_size,
92 AccessFlags access_flags,
93 InlineTableSizes* sizes,
94 ConstMethod::MethodType method_type,
95 Symbol* name,
96 TRAPS) {
97 assert(!access_flags.is_native() || byte_code_size == 0,
98 "native methods should not contain byte codes");
99 ConstMethod* cm = ConstMethod::allocate(loader_data,
100 byte_code_size,
101 sizes,
102 method_type,
103 CHECK_NULL);
104 int size = Method::size(access_flags.is_native());
105 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
106 }
107
108 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
109 NoSafepointVerifier no_safepoint;
110 set_constMethod(xconst);
111 set_access_flags(access_flags);
112 set_intrinsic_id(vmIntrinsics::_none);
113 clear_method_data();
114 clear_method_counters();
115 set_vtable_index(Method::garbage_vtable_index);
116
117 // Fix and bury in Method*
118 set_interpreter_entry(nullptr); // sets i2i entry and from_int
119 set_adapter_entry(nullptr);
120 Method::clear_code(); // from_c/from_i get set to c2i/i2i
121
122 if (access_flags.is_native()) {
123 clear_native_function();
124 set_signature_handler(nullptr);
125 }
126 NOT_PRODUCT(set_compiled_invocation_count(0);)
127 // Name is very useful for debugging.
128 NOT_PRODUCT(_name = name;)
129 }
130
131 // Release Method*. The nmethod will be gone when we get here because
132 // we've walked the code cache.
133 void Method::deallocate_contents(ClassLoaderData* loader_data) {
134 MetadataFactory::free_metadata(loader_data, constMethod());
135 set_constMethod(nullptr);
136 MetadataFactory::free_metadata(loader_data, method_data());
137 clear_method_data();
138 MetadataFactory::free_metadata(loader_data, method_counters());
139 clear_method_counters();
140 set_adapter_entry(nullptr);
141 // The nmethod will be gone when we get here.
142 if (code() != nullptr) _code = nullptr;
143 }
144
145 void Method::release_C_heap_structures() {
146 if (method_data()) {
147 method_data()->release_C_heap_structures();
148
149 // Destroy MethodData embedded lock
150 method_data()->~MethodData();
151 }
152 }
153
154 address Method::get_i2c_entry() {
155 if (is_abstract()) {
156 return SharedRuntime::throw_AbstractMethodError_entry();
157 }
158 assert(adapter() != nullptr, "must have");
159 return adapter()->get_i2c_entry();
160 }
161
162 address Method::get_c2i_entry() {
163 if (is_abstract()) {
164 return SharedRuntime::get_handle_wrong_method_abstract_stub();
165 }
166 assert(adapter() != nullptr, "must have");
167 return adapter()->get_c2i_entry();
168 }
169
170 address Method::get_c2i_inline_entry() {
171 assert(adapter() != nullptr, "must have");
172 return adapter()->get_c2i_inline_entry();
173 }
174
175 address Method::get_c2i_unverified_entry() {
176 assert(adapter() != nullptr, "must have");
177 return adapter()->get_c2i_unverified_entry();
178 }
179
180 address Method::get_c2i_unverified_inline_entry() {
181 assert(adapter() != nullptr, "must have");
182 return adapter()->get_c2i_unverified_inline_entry();
183 }
184
185 address Method::get_c2i_no_clinit_check_entry() {
186 assert(VM_Version::supports_fast_class_init_checks(), "");
187 assert(adapter() != nullptr, "must have");
188 return adapter()->get_c2i_no_clinit_check_entry();
189 }
190
191 char* Method::name_and_sig_as_C_string() const {
192 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
193 }
194
195 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
196 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
197 }
198
199 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
200 const char* klass_name = klass->external_name();
201 int klass_name_len = (int)strlen(klass_name);
202 int method_name_len = method_name->utf8_length();
203 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
204 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
205 strcpy(dest, klass_name);
206 dest[klass_name_len] = '.';
207 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
208 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
209 dest[len] = 0;
210 return dest;
211 }
212
213 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
214 Symbol* klass_name = klass->name();
215 klass_name->as_klass_external_name(buf, size);
216 int len = (int)strlen(buf);
217
218 if (len < size - 1) {
219 buf[len++] = '.';
220
221 method_name->as_C_string(&(buf[len]), size - len);
222 len = (int)strlen(buf);
223
224 signature->as_C_string(&(buf[len]), size - len);
225 }
226
227 return buf;
228 }
229
230 const char* Method::external_name() const {
231 return external_name(constants()->pool_holder(), name(), signature());
232 }
233
234 void Method::print_external_name(outputStream *os) const {
235 print_external_name(os, constants()->pool_holder(), name(), signature());
236 }
237
238 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
239 stringStream ss;
240 print_external_name(&ss, klass, method_name, signature);
241 return ss.as_string();
242 }
243
244 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
245 signature->print_as_signature_external_return_type(os);
246 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
247 signature->print_as_signature_external_parameters(os);
248 os->print(")");
249 }
250
251 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
252 if (log_is_enabled(Debug, exceptions)) {
253 ResourceMark rm(THREAD);
254 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
255 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
256 }
257 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
258 // access exception table
259 ExceptionTable table(mh());
260 int length = table.length();
261 // iterate through all entries sequentially
262 constantPoolHandle pool(THREAD, mh->constants());
263 for (int i = 0; i < length; i ++) {
264 //reacquire the table in case a GC happened
265 ExceptionTable table(mh());
266 int beg_bci = table.start_pc(i);
267 int end_bci = table.end_pc(i);
268 assert(beg_bci <= end_bci, "inconsistent exception table");
269 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
270 beg_bci, end_bci);
271
272 if (beg_bci <= throw_bci && throw_bci < end_bci) {
273 // exception handler bci range covers throw_bci => investigate further
274 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
275
276 int handler_bci = table.handler_pc(i);
277 int klass_index = table.catch_type_index(i);
278 if (klass_index == 0) {
279 if (log_is_enabled(Info, exceptions)) {
280 ResourceMark rm(THREAD);
281 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
282 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
283 }
284 return handler_bci;
285 } else if (ex_klass == nullptr) {
286 // Is this even possible?
287 if (log_is_enabled(Info, exceptions)) {
288 ResourceMark rm(THREAD);
289 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
290 mh()->name()->as_C_string(), handler_bci);
291 }
292 return handler_bci;
293 } else {
294 if (log_is_enabled(Debug, exceptions)) {
295 ResourceMark rm(THREAD);
296 log_debug(exceptions)(" - resolving catch type \"%s\"",
297 pool->klass_name_at(klass_index)->as_C_string());
298 }
299 // we know the exception class => get the constraint class
300 // this may require loading of the constraint class; if verification
301 // fails or some other exception occurs, return handler_bci
302 Klass* k = pool->klass_at(klass_index, THREAD);
303 if (HAS_PENDING_EXCEPTION) {
304 if (log_is_enabled(Debug, exceptions)) {
305 ResourceMark rm(THREAD);
306 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
307 PENDING_EXCEPTION->klass()->external_name());
308 }
309 return handler_bci;
310 }
311 assert(k != nullptr, "klass not loaded");
312 if (ex_klass->is_subtype_of(k)) {
313 if (log_is_enabled(Info, exceptions)) {
314 ResourceMark rm(THREAD);
315 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
316 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
317 }
318 return handler_bci;
319 }
320 }
321 }
322 }
323
324 if (log_is_enabled(Debug, exceptions)) {
325 ResourceMark rm(THREAD);
326 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
327 ex_klass->external_name(), mh->name()->as_C_string());
328 }
329
330 return -1;
331 }
332
333 void Method::mask_for(int bci, InterpreterOopMap* mask) {
334 methodHandle h_this(Thread::current(), this);
335 mask_for(h_this, bci, mask);
336 }
337
338 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
339 assert(this_mh() == this, "Sanity");
340 method_holder()->mask_for(this_mh, bci, mask);
341 }
342
343 int Method::bci_from(address bcp) const {
344 if (is_native() && bcp == nullptr) {
345 return 0;
346 }
347 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
348 // may call this after interrupting a nested ResourceMark.
349 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
350 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
351
352 return int(bcp - code_base());
353 }
354
355
356 int Method::validate_bci(int bci) const {
357 // Called from the verifier, and should return -1 if not valid.
358 return ((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size())) ? bci : -1;
359 }
360
361 // Return bci if it appears to be a valid bcp
362 // Return -1 otherwise.
363 // Used by profiling code, when invalid data is a possibility.
364 // The caller is responsible for validating the Method* itself.
365 int Method::validate_bci_from_bcp(address bcp) const {
366 // keep bci as -1 if not a valid bci
367 int bci = -1;
368 if (bcp == nullptr || bcp == code_base()) {
369 // code_size() may return 0 and we allow 0 here
370 // the method may be native
371 bci = 0;
372 } else if (contains(bcp)) {
373 bci = int(bcp - code_base());
374 }
375 // Assert that if we have dodged any asserts, bci is negative.
376 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
377 return bci;
378 }
379
380 address Method::bcp_from(int bci) const {
381 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
382 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
383 address bcp = code_base() + bci;
384 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
385 return bcp;
386 }
387
388 address Method::bcp_from(address bcp) const {
389 if (is_native() && bcp == nullptr) {
390 return code_base();
391 } else {
392 return bcp;
393 }
394 }
395
396 int Method::size(bool is_native) {
397 // If native, then include pointers for native_function and signature_handler
398 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
399 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
400 return align_metadata_size(header_size() + extra_words);
401 }
402
403 Symbol* Method::klass_name() const {
404 return method_holder()->name();
405 }
406
407 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
408 log_trace(aot)("Iter(Method): %p", this);
409
410 if (!method_holder()->is_rewritten() || CDSConfig::is_valhalla_preview()) {
411 it->push(&_constMethod, MetaspaceClosure::_writable);
412 } else {
413 it->push(&_constMethod);
414 }
415 it->push(&_adapter);
416 it->push(&_method_data);
417 it->push(&_method_counters);
418 NOT_PRODUCT(it->push(&_name);)
419 }
420
421 #if INCLUDE_CDS
422 // Attempt to return method to original state. Clear any pointers
423 // (to objects outside the shared spaces). We won't be able to predict
424 // where they should point in a new JVM. Further initialize some
425 // entries now in order allow them to be write protected later.
426
427 void Method::remove_unshareable_info() {
428 unlink_method();
429 if (method_data() != nullptr) {
430 method_data()->remove_unshareable_info();
431 }
432 if (method_counters() != nullptr) {
433 method_counters()->remove_unshareable_info();
434 }
435 if (CDSConfig::is_dumping_adapters() && _adapter != nullptr) {
436 _adapter->remove_unshareable_info();
437 _adapter = nullptr;
438 }
439 JFR_ONLY(REMOVE_METHOD_ID(this);)
440 }
441
442 void Method::restore_unshareable_info(TRAPS) {
443 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
444 if (method_data() != nullptr) {
445 method_data()->restore_unshareable_info(CHECK);
446 }
447 if (method_counters() != nullptr) {
448 method_counters()->restore_unshareable_info(CHECK);
449 }
450 if (_adapter != nullptr) {
451 assert(_adapter->is_linked(), "must be");
452 _from_compiled_entry = _adapter->get_c2i_entry();
453 _from_compiled_inline_entry = _adapter->get_c2i_inline_entry();
454 _from_compiled_inline_ro_entry = _adapter->get_c2i_inline_ro_entry();
455 }
456 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
457 }
458 #endif
459
460 void Method::set_vtable_index(int index) {
461 if (in_aot_cache() && !AOTMetaspace::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
462 // At runtime initialize_vtable is rerun as part of link_class_impl()
463 // for a shared class loaded by the non-boot loader to obtain the loader
464 // constraints based on the runtime classloaders' context.
465 return; // don't write into the shared class
466 } else {
467 _vtable_index = index;
468 }
469 }
470
471 void Method::set_itable_index(int index) {
472 if (in_aot_cache() && !AOTMetaspace::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
473 // At runtime initialize_itable is rerun as part of link_class_impl()
474 // for a shared class loaded by the non-boot loader to obtain the loader
475 // constraints based on the runtime classloaders' context. The dumptime
476 // itable index should be the same as the runtime index.
477 assert(_vtable_index == itable_index_max - index,
478 "archived itable index is different from runtime index");
479 return; // don't write into the shared class
480 } else {
481 _vtable_index = itable_index_max - index;
482 }
483 assert(valid_itable_index(), "");
484 }
485
486 // The RegisterNatives call being attempted tried to register with a method that
487 // is not native. Ask JVM TI what prefixes have been specified. Then check
488 // to see if the native method is now wrapped with the prefixes. See the
489 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
490 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
491 #if INCLUDE_JVMTI
492 ResourceMark rm(THREAD);
493 Method* method;
494 int name_len = name->utf8_length();
495 char* name_str = name->as_utf8();
496 int prefix_count;
497 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
498 for (int i = 0; i < prefix_count; i++) {
499 char* prefix = prefixes[i];
500 int prefix_len = (int)strlen(prefix);
501
502 // try adding this prefix to the method name and see if it matches another method name
503 int trial_len = name_len + prefix_len;
504 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
505 strcpy(trial_name_str, prefix);
506 strcat(trial_name_str, name_str);
507 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
508 if (trial_name == nullptr) {
509 continue; // no such symbol, so this prefix wasn't used, try the next prefix
510 }
511 method = k->lookup_method(trial_name, signature);
512 if (method == nullptr) {
513 continue; // signature doesn't match, try the next prefix
514 }
515 if (method->is_native()) {
516 method->set_is_prefixed_native();
517 return method; // wahoo, we found a prefixed version of the method, return it
518 }
519 // found as non-native, so prefix is good, add it, probably just need more prefixes
520 name_len = trial_len;
521 name_str = trial_name_str;
522 }
523 #endif // INCLUDE_JVMTI
524 return nullptr; // not found
525 }
526
527 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
528 Method* method = k->lookup_method(name, signature);
529 if (method == nullptr) {
530 ResourceMark rm(THREAD);
531 stringStream st;
532 st.print("Method '");
533 print_external_name(&st, k, name, signature);
534 st.print("' name or signature does not match");
535 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
536 }
537 if (!method->is_native()) {
538 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
539 method = find_prefixed_native(k, name, signature, THREAD);
540 if (method == nullptr) {
541 ResourceMark rm(THREAD);
542 stringStream st;
543 st.print("Method '");
544 print_external_name(&st, k, name, signature);
545 st.print("' is not declared as native");
546 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
547 }
548 }
549
550 if (entry != nullptr) {
551 method->set_native_function(entry, native_bind_event_is_interesting);
552 } else {
553 method->clear_native_function();
554 }
555 if (log_is_enabled(Debug, jni, resolve)) {
556 ResourceMark rm(THREAD);
557 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
558 method->method_holder()->external_name(),
559 method->name()->as_C_string());
560 }
561 return true;
562 }
563
564 bool Method::was_executed_more_than(int n) {
565 // Invocation counter is reset when the Method* is compiled.
566 // If the method has compiled code we therefore assume it has
567 // be executed more than n times.
568 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
569 // interpreter doesn't bump invocation counter of trivial methods
570 // compiler does not bump invocation counter of compiled methods
571 return true;
572 }
573 else if ((method_counters() != nullptr &&
574 method_counters()->invocation_counter()->carry()) ||
575 (method_data() != nullptr &&
576 method_data()->invocation_counter()->carry())) {
577 // The carry bit is set when the counter overflows and causes
578 // a compilation to occur. We don't know how many times
579 // the counter has been reset, so we simply assume it has
580 // been executed more than n times.
581 return true;
582 } else {
583 return invocation_count() > n;
584 }
585 }
586
587 void Method::print_invocation_count(outputStream* st) {
588 //---< compose+print method return type, klass, name, and signature >---
589 if (is_static()) { st->print("static "); }
590 if (is_final()) { st->print("final "); }
591 if (is_synchronized()) { st->print("synchronized "); }
592 if (is_native()) { st->print("native "); }
593 st->print("%s::", method_holder()->external_name());
594 name()->print_symbol_on(st);
595 signature()->print_symbol_on(st);
596
597 if (WizardMode) {
598 // dump the size of the byte codes
599 st->print(" {%d}", code_size());
600 }
601 st->cr();
602
603 // Counting based on signed int counters tends to overflow with
604 // longer-running workloads on fast machines. The counters under
605 // consideration here, however, are limited in range by counting
606 // logic. See InvocationCounter:count_limit for example.
607 // No "overflow precautions" need to be implemented here.
608 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
609 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
610 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
611
612 if (method_data() != nullptr) {
613 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
614 }
615
616 #ifndef PRODUCT
617 if (CountCompiledCalls) {
618 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
619 }
620 #endif
621 }
622
623 MethodTrainingData* Method::training_data_or_null() const {
624 MethodCounters* mcs = method_counters();
625 if (mcs == nullptr) {
626 return nullptr;
627 } else {
628 MethodTrainingData* mtd = mcs->method_training_data();
629 if (mtd == mcs->method_training_data_sentinel()) {
630 return nullptr;
631 }
632 return mtd;
633 }
634 }
635
636 bool Method::init_training_data(MethodTrainingData* td) {
637 MethodCounters* mcs = method_counters();
638 if (mcs == nullptr) {
639 return false;
640 } else {
641 return mcs->init_method_training_data(td);
642 }
643 }
644
645 bool Method::install_training_method_data(const methodHandle& method) {
646 MethodTrainingData* mtd = MethodTrainingData::find(method);
647 if (mtd != nullptr && mtd->final_profile() != nullptr) {
648 AtomicAccess::replace_if_null(&method->_method_data, mtd->final_profile());
649 return true;
650 }
651 return false;
652 }
653
654 // Build a MethodData* object to hold profiling information collected on this
655 // method when requested.
656 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
657 if (install_training_method_data(method)) {
658 return;
659 }
660 // Do not profile the method if metaspace has hit an OOM previously
661 // allocating profiling data. Callers clear pending exception so don't
662 // add one here.
663 if (ClassLoaderDataGraph::has_metaspace_oom()) {
664 return;
665 }
666
667 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
668 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
669 if (HAS_PENDING_EXCEPTION) {
670 CompileBroker::log_metaspace_failure();
671 ClassLoaderDataGraph::set_metaspace_oom(true);
672 return; // return the exception (which is cleared)
673 }
674
675 if (!AtomicAccess::replace_if_null(&method->_method_data, method_data)) {
676 MetadataFactory::free_metadata(loader_data, method_data);
677 return;
678 }
679
680 if (PrintMethodData && (Verbose || WizardMode)) {
681 ResourceMark rm(THREAD);
682 tty->print("build_profiling_method_data for ");
683 method->print_name(tty);
684 tty->cr();
685 // At the end of the run, the MDO, full of data, will be dumped.
686 }
687 }
688
689 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
690 // Do not profile the method if metaspace has hit an OOM previously
691 if (ClassLoaderDataGraph::has_metaspace_oom()) {
692 return nullptr;
693 }
694
695 methodHandle mh(current, m);
696 MethodCounters* counters;
697 if (current->is_Java_thread()) {
698 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
699 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
700 // if needed.
701 counters = MethodCounters::allocate_with_exception(mh, THREAD);
702 if (HAS_PENDING_EXCEPTION) {
703 CLEAR_PENDING_EXCEPTION;
704 }
705 } else {
706 // Call metaspace allocation that doesn't throw exception if the
707 // current thread isn't a JavaThread, ie. the VMThread.
708 counters = MethodCounters::allocate_no_exception(mh);
709 }
710
711 if (counters == nullptr) {
712 CompileBroker::log_metaspace_failure();
713 ClassLoaderDataGraph::set_metaspace_oom(true);
714 return nullptr;
715 }
716
717 if (!mh->init_method_counters(counters)) {
718 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
719 }
720
721 return mh->method_counters();
722 }
723
724 bool Method::init_method_counters(MethodCounters* counters) {
725 // Try to install a pointer to MethodCounters, return true on success.
726 return AtomicAccess::replace_if_null(&_method_counters, counters);
727 }
728
729 void Method::set_exception_handler_entered(int handler_bci) {
730 if (ProfileExceptionHandlers) {
731 MethodData* mdo = method_data();
732 if (mdo != nullptr) {
733 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
734 handler_data.set_exception_handler_entered();
735 }
736 }
737 }
738
739 int Method::extra_stack_words() {
740 // not an inline function, to avoid a header dependency on Interpreter
741 return extra_stack_entries() * Interpreter::stackElementSize;
742 }
743
744 // InlineKlass the method is declared to return. This must not
745 // safepoint as it is called with references live on the stack at
746 // locations the GC is unaware of.
747 InlineKlass* Method::returns_inline_type() const {
748 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
749 if (is_native()) {
750 return nullptr;
751 }
752 NoSafepointVerifier nsv;
753 SignatureStream ss(signature());
754 ss.skip_to_return_type();
755 return ss.as_inline_klass(method_holder());
756 }
757
758 bool Method::compute_has_loops_flag() {
759 BytecodeStream bcs(methodHandle(Thread::current(), this));
760 Bytecodes::Code bc;
761
762 while ((bc = bcs.next()) >= 0) {
763 switch (bc) {
764 case Bytecodes::_ifeq:
765 case Bytecodes::_ifnull:
766 case Bytecodes::_iflt:
767 case Bytecodes::_ifle:
768 case Bytecodes::_ifne:
769 case Bytecodes::_ifnonnull:
770 case Bytecodes::_ifgt:
771 case Bytecodes::_ifge:
772 case Bytecodes::_if_icmpeq:
773 case Bytecodes::_if_icmpne:
774 case Bytecodes::_if_icmplt:
775 case Bytecodes::_if_icmpgt:
776 case Bytecodes::_if_icmple:
777 case Bytecodes::_if_icmpge:
778 case Bytecodes::_if_acmpeq:
779 case Bytecodes::_if_acmpne:
780 case Bytecodes::_goto:
781 case Bytecodes::_jsr:
782 if (bcs.dest() < bcs.next_bci()) {
783 return set_has_loops();
784 }
785 break;
786
787 case Bytecodes::_goto_w:
788 case Bytecodes::_jsr_w:
789 if (bcs.dest_w() < bcs.next_bci()) {
790 return set_has_loops();
791 }
792 break;
793
794 case Bytecodes::_lookupswitch: {
795 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
796 if (lookupswitch.default_offset() < 0) {
797 return set_has_loops();
798 } else {
799 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
800 LookupswitchPair pair = lookupswitch.pair_at(i);
801 if (pair.offset() < 0) {
802 return set_has_loops();
803 }
804 }
805 }
806 break;
807 }
808 case Bytecodes::_tableswitch: {
809 Bytecode_tableswitch tableswitch(this, bcs.bcp());
810 if (tableswitch.default_offset() < 0) {
811 return set_has_loops();
812 } else {
813 for (int i = 0; i < tableswitch.length(); ++i) {
814 if (tableswitch.dest_offset_at(i) < 0) {
815 return set_has_loops();
816 }
817 }
818 }
819 break;
820 }
821 default:
822 break;
823 }
824 }
825
826 _flags.set_has_loops_flag_init(true);
827 return false;
828 }
829
830 bool Method::is_final_method(AccessFlags class_access_flags) const {
831 // or "does_not_require_vtable_entry"
832 // default method or overpass can occur, is not final (reuses vtable entry)
833 // private methods in classes get vtable entries for backward class compatibility.
834 if (is_overpass() || is_default_method()) return false;
835 return is_final() || class_access_flags.is_final();
836 }
837
838 bool Method::is_final_method() const {
839 return is_final_method(method_holder()->access_flags());
840 }
841
842 bool Method::is_default_method() const {
843 if (method_holder() != nullptr &&
844 method_holder()->is_interface() &&
845 !is_abstract() && !is_private()) {
846 return true;
847 } else {
848 return false;
849 }
850 }
851
852 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
853 if (is_final_method(class_access_flags)) return true;
854 #ifdef ASSERT
855 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
856 if (class_access_flags.is_interface()) {
857 ResourceMark rm;
858 assert(is_nonv == is_static() || is_nonv == is_private(),
859 "nonvirtual unexpected for non-static, non-private: %s",
860 name_and_sig_as_C_string());
861 }
862 #endif
863 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
864 return vtable_index() == nonvirtual_vtable_index;
865 }
866
867 bool Method::can_be_statically_bound() const {
868 return can_be_statically_bound(method_holder()->access_flags());
869 }
870
871 bool Method::can_be_statically_bound(InstanceKlass* context) const {
872 return (method_holder() == context) && can_be_statically_bound();
873 }
874
875 /**
876 * Returns false if this is one of specially treated methods for
877 * which we have to provide stack trace in throw in compiled code.
878 * Returns true otherwise.
879 */
880 bool Method::can_omit_stack_trace() {
881 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
882 return false; // All methods in sun.invoke.util.ValueConversions
883 }
884 return true;
885 }
886
887 bool Method::is_accessor() const {
888 return is_getter() || is_setter();
889 }
890
891 bool Method::is_getter() const {
892 if (code_size() != 5) return false;
893 if (size_of_parameters() != 1) return false;
894 if (java_code_at(0) != Bytecodes::_aload_0) return false;
895 if (java_code_at(1) != Bytecodes::_getfield) return false;
896 switch (java_code_at(4)) {
897 case Bytecodes::_ireturn:
898 case Bytecodes::_lreturn:
899 case Bytecodes::_freturn:
900 case Bytecodes::_dreturn:
901 case Bytecodes::_areturn:
902 break;
903 default:
904 return false;
905 }
906 if (has_scalarized_return()) {
907 // Don't treat this as (trivial) getter method because the
908 // inline type should be returned in a scalarized form.
909 return false;
910 }
911 return true;
912 }
913
914 bool Method::is_setter() const {
915 if (code_size() != 6) return false;
916 if (java_code_at(0) != Bytecodes::_aload_0) return false;
917 switch (java_code_at(1)) {
918 case Bytecodes::_iload_1:
919 case Bytecodes::_aload_1:
920 case Bytecodes::_fload_1:
921 if (size_of_parameters() != 2) return false;
922 break;
923 case Bytecodes::_dload_1:
924 case Bytecodes::_lload_1:
925 if (size_of_parameters() != 3) return false;
926 break;
927 default:
928 return false;
929 }
930 if (java_code_at(2) != Bytecodes::_putfield) return false;
931 if (java_code_at(5) != Bytecodes::_return) return false;
932 if (has_scalarized_args()) {
933 // Don't treat this as (trivial) setter method because the
934 // inline type argument should be passed in a scalarized form.
935 return false;
936 }
937 return true;
938 }
939
940 bool Method::is_constant_getter() const {
941 int last_index = code_size() - 1;
942 // Check if the first 1-3 bytecodes are a constant push
943 // and the last bytecode is a return.
944 return (2 <= code_size() && code_size() <= 4 &&
945 Bytecodes::is_const(java_code_at(0)) &&
946 Bytecodes::length_for(java_code_at(0)) == last_index &&
947 Bytecodes::is_return(java_code_at(last_index)) &&
948 !has_scalarized_args());
949 }
950
951 bool Method::is_class_initializer() const {
952 // For classfiles version 51 or greater, ensure that the clinit method is
953 // static. Non-static methods with the name "<clinit>" are not static
954 // initializers. (older classfiles exempted for backward compatibility)
955 return (name() == vmSymbols::class_initializer_name() &&
956 (is_static() ||
957 method_holder()->major_version() < 51));
958 }
959
960 // A method named <init>, is a classic object constructor.
961 bool Method::is_object_constructor() const {
962 return name() == vmSymbols::object_initializer_name();
963 }
964
965 bool Method::needs_clinit_barrier() const {
966 return is_static() && !method_holder()->is_initialized();
967 }
968
969 bool Method::is_object_wait0() const {
970 return klass_name() == vmSymbols::java_lang_Object()
971 && name() == vmSymbols::wait_name();
972 }
973
974 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
975 int length = method->checked_exceptions_length();
976 if (length == 0) { // common case
977 return objArrayHandle(THREAD, Universe::the_empty_class_array());
978 } else {
979 methodHandle h_this(THREAD, method);
980 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
981 objArrayHandle mirrors (THREAD, m_oop);
982 for (int i = 0; i < length; i++) {
983 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
984 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
985 if (log_is_enabled(Warning, exceptions) &&
986 !k->is_subclass_of(vmClasses::Throwable_klass())) {
987 ResourceMark rm(THREAD);
988 log_warning(exceptions)(
989 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
990 k->external_name(), method->external_name());
991 }
992 mirrors->obj_at_put(i, k->java_mirror());
993 }
994 return mirrors;
995 }
996 };
997
998
999 int Method::line_number_from_bci(int bci) const {
1000 int best_bci = 0;
1001 int best_line = -1;
1002 if (bci == SynchronizationEntryBCI) bci = 0;
1003 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
1004 // The line numbers are a short array of 2-tuples [start_pc, line_number].
1005 // Not necessarily sorted and not necessarily one-to-one.
1006 CompressedLineNumberReadStream stream(compressed_linenumber_table());
1007 while (stream.read_pair()) {
1008 if (stream.bci() == bci) {
1009 // perfect match
1010 return stream.line();
1011 } else {
1012 // update best_bci/line
1013 if (stream.bci() < bci && stream.bci() >= best_bci) {
1014 best_bci = stream.bci();
1015 best_line = stream.line();
1016 }
1017 }
1018 }
1019 }
1020 return best_line;
1021 }
1022
1023
1024 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1025 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
1026 Thread *thread = Thread::current();
1027 Symbol* klass_name = constants()->klass_name_at(klass_index);
1028 Handle loader(thread, method_holder()->class_loader());
1029 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr;
1030 } else {
1031 return true;
1032 }
1033 }
1034
1035
1036 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1037 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1038 if (must_be_resolved) {
1039 // Make sure klass is resolved in constantpool.
1040 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
1041 return false;
1042 }
1043 }
1044 return is_klass_loaded_by_klass_index(klass_index);
1045 }
1046
1047
1048 void Method::set_native_function(address function, bool post_event_flag) {
1049 assert(function != nullptr, "use clear_native_function to unregister natives");
1050 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1051 address* native_function = native_function_addr();
1052
1053 // We can see racers trying to place the same native function into place. Once
1054 // is plenty.
1055 address current = *native_function;
1056 if (current == function) return;
1057 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1058 function != nullptr) {
1059 // native_method_throw_unsatisfied_link_error_entry() should only
1060 // be passed when post_event_flag is false.
1061 assert(function !=
1062 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1063 "post_event_flag mismatch");
1064
1065 // post the bind event, and possible change the bind function
1066 JvmtiExport::post_native_method_bind(this, &function);
1067 }
1068 *native_function = function;
1069 // This function can be called more than once. We must make sure that we always
1070 // use the latest registered method -> check if a stub already has been generated.
1071 // If so, we have to make it not_entrant.
1072 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1073 if (nm != nullptr) {
1074 nm->make_not_entrant(nmethod::InvalidationReason::SET_NATIVE_FUNCTION);
1075 }
1076 }
1077
1078
1079 bool Method::has_native_function() const {
1080 if (is_special_native_intrinsic())
1081 return false; // special-cased in SharedRuntime::generate_native_wrapper
1082 address func = native_function();
1083 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1084 }
1085
1086
1087 void Method::clear_native_function() {
1088 // Note: is_method_handle_intrinsic() is allowed here.
1089 set_native_function(
1090 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1091 !native_bind_event_is_interesting);
1092 this->unlink_code();
1093 }
1094
1095
1096 void Method::set_signature_handler(address handler) {
1097 address* signature_handler = signature_handler_addr();
1098 *signature_handler = handler;
1099 }
1100
1101
1102 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1103 assert(reason != nullptr, "must provide a reason");
1104 if (PrintCompilation && report) {
1105 ttyLocker ttyl;
1106 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1107 if (comp_level == CompLevel_all) {
1108 tty->print("all levels ");
1109 } else {
1110 tty->print("level %d ", comp_level);
1111 }
1112 this->print_short_name(tty);
1113 int size = this->code_size();
1114 if (size > 0) {
1115 tty->print(" (%d bytes)", size);
1116 }
1117 if (reason != nullptr) {
1118 tty->print(" %s", reason);
1119 }
1120 tty->cr();
1121 }
1122 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1123 ttyLocker ttyl;
1124 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'",
1125 os::current_thread_id(), is_osr, comp_level);
1126 if (reason != nullptr) {
1127 xtty->print(" reason=\'%s\'", reason);
1128 }
1129 xtty->method(this);
1130 xtty->stamp();
1131 xtty->end_elem();
1132 }
1133 }
1134
1135 bool Method::is_always_compilable() const {
1136 // Generated adapters must be compiled
1137 if (is_special_native_intrinsic() && is_synthetic()) {
1138 assert(!is_not_c1_compilable(), "sanity check");
1139 assert(!is_not_c2_compilable(), "sanity check");
1140 return true;
1141 }
1142
1143 return false;
1144 }
1145
1146 bool Method::is_not_compilable(int comp_level) const {
1147 if (number_of_breakpoints() > 0)
1148 return true;
1149 if (is_always_compilable())
1150 return false;
1151 if (comp_level == CompLevel_any)
1152 return is_not_c1_compilable() && is_not_c2_compilable();
1153 if (is_c1_compile(comp_level))
1154 return is_not_c1_compilable();
1155 if (is_c2_compile(comp_level))
1156 return is_not_c2_compilable();
1157 return false;
1158 }
1159
1160 // call this when compiler finds that this method is not compilable
1161 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1162 if (is_always_compilable()) {
1163 // Don't mark a method which should be always compilable
1164 return;
1165 }
1166 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1167 if (comp_level == CompLevel_all) {
1168 set_is_not_c1_compilable();
1169 set_is_not_c2_compilable();
1170 } else {
1171 if (is_c1_compile(comp_level))
1172 set_is_not_c1_compilable();
1173 if (is_c2_compile(comp_level))
1174 set_is_not_c2_compilable();
1175 }
1176 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1177 }
1178
1179 bool Method::is_not_osr_compilable(int comp_level) const {
1180 if (is_not_compilable(comp_level))
1181 return true;
1182 if (comp_level == CompLevel_any)
1183 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1184 if (is_c1_compile(comp_level))
1185 return is_not_c1_osr_compilable();
1186 if (is_c2_compile(comp_level))
1187 return is_not_c2_osr_compilable();
1188 return false;
1189 }
1190
1191 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1192 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1193 if (comp_level == CompLevel_all) {
1194 set_is_not_c1_osr_compilable();
1195 set_is_not_c2_osr_compilable();
1196 } else {
1197 if (is_c1_compile(comp_level))
1198 set_is_not_c1_osr_compilable();
1199 if (is_c2_compile(comp_level))
1200 set_is_not_c2_osr_compilable();
1201 }
1202 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1203 }
1204
1205 // Revert to using the interpreter and clear out the nmethod
1206 void Method::clear_code() {
1207 // this may be null if c2i adapters have not been made yet
1208 // Only should happen at allocate time.
1209 if (adapter() == nullptr) {
1210 _from_compiled_entry = nullptr;
1211 _from_compiled_inline_entry = nullptr;
1212 _from_compiled_inline_ro_entry = nullptr;
1213 } else {
1214 _from_compiled_entry = adapter()->get_c2i_entry();
1215 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1216 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1217 }
1218 OrderAccess::storestore();
1219 _from_interpreted_entry = _i2i_entry;
1220 OrderAccess::storestore();
1221 _code = nullptr;
1222 }
1223
1224 void Method::unlink_code(nmethod *compare) {
1225 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1226 // We need to check if either the _code or _from_compiled_code_entry_point
1227 // refer to this nmethod because there is a race in setting these two fields
1228 // in Method* as seen in bugid 4947125.
1229 if (code() == compare ||
1230 from_compiled_entry() == compare->verified_entry_point()) {
1231 clear_code();
1232 }
1233 }
1234
1235 void Method::unlink_code() {
1236 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1237 clear_code();
1238 }
1239
1240 #if INCLUDE_CDS
1241 // Called by class data sharing to remove any entry points (which are not shared)
1242 void Method::unlink_method() {
1243 assert(CDSConfig::is_dumping_archive(), "sanity");
1244 _code = nullptr;
1245 if (!CDSConfig::is_dumping_adapters()) {
1246 _adapter = nullptr;
1247 }
1248 _i2i_entry = nullptr;
1249 _from_compiled_entry = nullptr;
1250 _from_compiled_inline_entry = nullptr;
1251 _from_compiled_inline_ro_entry = nullptr;
1252 _from_interpreted_entry = nullptr;
1253
1254 if (is_native()) {
1255 *native_function_addr() = nullptr;
1256 set_signature_handler(nullptr);
1257 }
1258 NOT_PRODUCT(set_compiled_invocation_count(0);)
1259
1260 clear_method_data();
1261 clear_method_counters();
1262 clear_is_not_c1_compilable();
1263 clear_is_not_c1_osr_compilable();
1264 clear_is_not_c2_compilable();
1265 clear_is_not_c2_osr_compilable();
1266 clear_queued_for_compilation();
1267
1268 remove_unshareable_flags();
1269 }
1270
1271 void Method::remove_unshareable_flags() {
1272 // clear all the flags that shouldn't be in the archived version
1273 assert(!is_old(), "must be");
1274 assert(!is_obsolete(), "must be");
1275 assert(!is_deleted(), "must be");
1276
1277 set_is_prefixed_native(false);
1278 set_queued_for_compilation(false);
1279 set_is_not_c2_compilable(false);
1280 set_is_not_c1_compilable(false);
1281 set_is_not_c2_osr_compilable(false);
1282 set_on_stack_flag(false);
1283 set_has_scalarized_args(false);
1284 set_has_scalarized_return(false);
1285 }
1286 #endif
1287
1288 // Called when the method_holder is getting linked. Setup entrypoints so the method
1289 // is ready to be called from interpreter, compiler, and vtables.
1290 void Method::link_method(const methodHandle& h_method, TRAPS) {
1291 if (log_is_enabled(Info, perf, class, link)) {
1292 ClassLoader::perf_ik_link_methods_count()->inc();
1293 }
1294
1295 // If the code cache is full, we may reenter this function for the
1296 // leftover methods that weren't linked.
1297 if (adapter() != nullptr) {
1298 if (adapter()->in_aot_cache()) {
1299 assert(adapter()->is_linked(), "Adapter is shared but not linked");
1300 } else {
1301 return;
1302 }
1303 }
1304 assert( _code == nullptr, "nothing compiled yet" );
1305
1306 // Setup interpreter entrypoint
1307 assert(this == h_method(), "wrong h_method()" );
1308
1309 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache");
1310 address entry = Interpreter::entry_for_method(h_method);
1311 assert(entry != nullptr, "interpreter entry must be non-null");
1312 // Sets both _i2i_entry and _from_interpreted_entry
1313 set_interpreter_entry(entry);
1314
1315 // Don't overwrite already registered native entries.
1316 if (is_native() && !has_native_function()) {
1317 set_native_function(
1318 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1319 !native_bind_event_is_interesting);
1320 }
1321 if (InlineTypeReturnedAsFields && returns_inline_type() && !has_scalarized_return()) {
1322 set_has_scalarized_return();
1323 }
1324
1325 // Setup compiler entrypoint. This is made eagerly, so we do not need
1326 // special handling of vtables. An alternative is to make adapters more
1327 // lazily by calling make_adapter() from from_compiled_entry() for the
1328 // normal calls. For vtable calls life gets more complicated. When a
1329 // call-site goes mega-morphic we need adapters in all methods which can be
1330 // called from the vtable. We need adapters on such methods that get loaded
1331 // later. Ditto for mega-morphic itable calls. If this proves to be a
1332 // problem we'll make these lazily later.
1333 if (is_abstract()) {
1334 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
1335 h_method->_from_compiled_entry = wrong_method_abstract;
1336 h_method->_from_compiled_inline_entry = wrong_method_abstract;
1337 h_method->_from_compiled_inline_ro_entry = wrong_method_abstract;
1338 } else if (_adapter == nullptr) {
1339 (void) make_adapters(h_method, CHECK);
1340 #ifndef ZERO
1341 assert(adapter()->is_linked(), "Adapter must have been linked");
1342 #endif
1343 h_method->_from_compiled_entry = adapter()->get_c2i_entry();
1344 h_method->_from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1345 h_method->_from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1346 }
1347
1348 // ONLY USE the h_method now as make_adapter may have blocked
1349
1350 if (h_method->is_continuation_native_intrinsic()) {
1351 _from_interpreted_entry = nullptr;
1352 _from_compiled_entry = nullptr;
1353 _i2i_entry = nullptr;
1354 if (Continuations::enabled()) {
1355 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1356 AdapterHandlerLibrary::create_native_wrapper(h_method);
1357 if (!h_method->has_compiled_code()) {
1358 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1359 }
1360 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1361 }
1362 }
1363 }
1364
1365 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1366 assert(!mh->is_abstract(), "abstract methods do not have adapters");
1367 PerfTraceTime timer(ClassLoader::perf_method_adapters_time());
1368
1369 // Adapters for compiled code are made eagerly here. They are fairly
1370 // small (generally < 100 bytes) and quick to make (and cached and shared)
1371 // so making them eagerly shouldn't be too expensive.
1372 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1373 if (adapter == nullptr ) {
1374 if (!is_init_completed()) {
1375 // Don't throw exceptions during VM initialization because java.lang.* classes
1376 // might not have been initialized, causing problems when constructing the
1377 // Java exception object.
1378 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1379 } else {
1380 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1381 }
1382 }
1383
1384 mh->set_adapter_entry(adapter);
1385 return adapter->get_c2i_entry();
1386 }
1387
1388 // The verified_code_entry() must be called when a invoke is resolved
1389 // on this method.
1390
1391 // It returns the compiled code entry point, after asserting not null.
1392 // This function is called after potential safepoints so that nmethod
1393 // or adapter that it points to is still live and valid.
1394 // This function must not hit a safepoint!
1395 address Method::verified_code_entry() {
1396 DEBUG_ONLY(NoSafepointVerifier nsv;)
1397 assert(_from_compiled_entry != nullptr, "must be set");
1398 return _from_compiled_entry;
1399 }
1400
1401 address Method::verified_inline_code_entry() {
1402 DEBUG_ONLY(NoSafepointVerifier nsv;)
1403 assert(_from_compiled_inline_entry != nullptr, "must be set");
1404 return _from_compiled_inline_entry;
1405 }
1406
1407 address Method::verified_inline_ro_code_entry() {
1408 DEBUG_ONLY(NoSafepointVerifier nsv;)
1409 assert(_from_compiled_inline_ro_entry != nullptr, "must be set");
1410 return _from_compiled_inline_ro_entry;
1411 }
1412
1413 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1414 // (could be racing a deopt).
1415 // Not inline to avoid circular ref.
1416 bool Method::check_code() const {
1417 // cached in a register or local. There's a race on the value of the field.
1418 nmethod *code = AtomicAccess::load_acquire(&_code);
1419 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1420 }
1421
1422 // Install compiled code. Instantly it can execute.
1423 void Method::set_code(const methodHandle& mh, nmethod *code) {
1424 assert_lock_strong(NMethodState_lock);
1425 assert( code, "use clear_code to remove code" );
1426 assert( mh->check_code(), "" );
1427
1428 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1429
1430 // These writes must happen in this order, because the interpreter will
1431 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1432 // which jumps to _from_compiled_entry.
1433 mh->_code = code; // Assign before allowing compiled code to exec
1434
1435 int comp_level = code->comp_level();
1436 // In theory there could be a race here. In practice it is unlikely
1437 // and not worth worrying about.
1438 if (comp_level > mh->highest_comp_level()) {
1439 mh->set_highest_comp_level(comp_level);
1440 }
1441
1442 OrderAccess::storestore();
1443 mh->_from_compiled_entry = code->verified_entry_point();
1444 mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1445 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1446 OrderAccess::storestore();
1447
1448 if (mh->is_continuation_native_intrinsic()) {
1449 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1450
1451 if (mh->is_continuation_enter_intrinsic()) {
1452 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1453 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1454 } else if (mh->is_continuation_yield_intrinsic()) {
1455 mh->_i2i_entry = mh->get_i2c_entry();
1456 } else {
1457 guarantee(false, "Unknown Continuation native intrinsic");
1458 }
1459 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1460 AtomicAccess::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1461 } else if (!mh->is_method_handle_intrinsic()) {
1462 // Instantly compiled code can execute.
1463 mh->_from_interpreted_entry = mh->get_i2c_entry();
1464 }
1465 }
1466
1467
1468 bool Method::is_overridden_in(Klass* k) const {
1469 InstanceKlass* ik = InstanceKlass::cast(k);
1470
1471 if (ik->is_interface()) return false;
1472
1473 // If method is an interface, we skip it - except if it
1474 // is a miranda method
1475 if (method_holder()->is_interface()) {
1476 // Check that method is not a miranda method
1477 if (ik->lookup_method(name(), signature()) == nullptr) {
1478 // No implementation exist - so miranda method
1479 return false;
1480 }
1481 return true;
1482 }
1483
1484 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1485 if (!has_vtable_index()) {
1486 return false;
1487 } else {
1488 Method* vt_m = ik->method_at_vtable(vtable_index());
1489 return vt_m != this;
1490 }
1491 }
1492
1493
1494 // give advice about whether this Method* should be cached or not
1495 bool Method::should_not_be_cached() const {
1496 if (is_old()) {
1497 // This method has been redefined. It is either EMCP or obsolete
1498 // and we don't want to cache it because that would pin the method
1499 // down and prevent it from being collectible if and when it
1500 // finishes executing.
1501 return true;
1502 }
1503
1504 // caching this method should be just fine
1505 return false;
1506 }
1507
1508
1509 /**
1510 * Returns true if this is one of the specially treated methods for
1511 * security related stack walks (like Reflection.getCallerClass).
1512 */
1513 bool Method::is_ignored_by_security_stack_walk() const {
1514 if (intrinsic_id() == vmIntrinsics::_invoke) {
1515 // This is Method.invoke() -- ignore it
1516 return true;
1517 }
1518 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1519 // This is an auxiliary frame -- ignore it
1520 return true;
1521 }
1522 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1523 // This is an internal adapter frame for method handles -- ignore it
1524 return true;
1525 }
1526 return false;
1527 }
1528
1529
1530 // Constant pool structure for invoke methods:
1531 enum {
1532 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1533 _imcp_invoke_signature, // utf8: (variable Symbol*)
1534 _imcp_limit
1535 };
1536
1537 // Test if this method is an MH adapter frame generated by Java code.
1538 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1539 bool Method::is_compiled_lambda_form() const {
1540 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1541 }
1542
1543 // Test if this method is an internal MH primitive method.
1544 bool Method::is_method_handle_intrinsic() const {
1545 vmIntrinsics::ID iid = intrinsic_id();
1546 return (MethodHandles::is_signature_polymorphic(iid) &&
1547 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1548 }
1549
1550 bool Method::has_member_arg() const {
1551 vmIntrinsics::ID iid = intrinsic_id();
1552 return (MethodHandles::is_signature_polymorphic(iid) &&
1553 MethodHandles::has_member_arg(iid));
1554 }
1555
1556 // Make an instance of a signature-polymorphic internal MH primitive.
1557 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1558 Symbol* signature,
1559 TRAPS) {
1560 ResourceMark rm(THREAD);
1561 methodHandle empty;
1562
1563 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1564 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1565 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1566
1567 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1568
1569 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1570 name->increment_refcount();
1571 signature->increment_refcount();
1572
1573 int cp_length = _imcp_limit;
1574 ClassLoaderData* loader_data = holder->class_loader_data();
1575 constantPoolHandle cp;
1576 {
1577 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1578 cp = constantPoolHandle(THREAD, cp_oop);
1579 }
1580 cp->copy_fields(holder->constants());
1581 cp->set_pool_holder(holder);
1582 cp->symbol_at_put(_imcp_invoke_name, name);
1583 cp->symbol_at_put(_imcp_invoke_signature, signature);
1584 cp->set_has_preresolution();
1585 cp->set_is_for_method_handle_intrinsic();
1586
1587 // decide on access bits: public or not?
1588 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1589 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1590 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1591 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1592
1593 methodHandle m;
1594 {
1595 InlineTableSizes sizes;
1596 Method* m_oop = Method::allocate(loader_data, 0,
1597 accessFlags_from(flags_bits), &sizes,
1598 ConstMethod::NORMAL,
1599 name,
1600 CHECK_(empty));
1601 m = methodHandle(THREAD, m_oop);
1602 }
1603 m->set_constants(cp());
1604 m->set_name_index(_imcp_invoke_name);
1605 m->set_signature_index(_imcp_invoke_signature);
1606 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1607 assert(m->signature() == signature, "");
1608 m->constMethod()->compute_from_signature(signature, must_be_static);
1609 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1610 assert(m->is_method_handle_intrinsic(), "");
1611 #ifdef ASSERT
1612 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1613 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1614 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1615 #endif //ASSERT
1616
1617 // Finally, set up its entry points.
1618 assert(m->can_be_statically_bound(), "");
1619 m->set_vtable_index(Method::nonvirtual_vtable_index);
1620 m->link_method(m, CHECK_(empty));
1621
1622 if (iid == vmIntrinsics::_linkToNative) {
1623 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1624 }
1625 if (log_is_enabled(Debug, methodhandles)) {
1626 LogTarget(Debug, methodhandles) lt;
1627 LogStream ls(lt);
1628 m->print_on(&ls);
1629 }
1630
1631 return m;
1632 }
1633
1634 #if INCLUDE_CDS
1635 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1636 if (m->adapter() != nullptr) {
1637 m->set_from_compiled_entry(m->adapter()->get_c2i_entry());
1638 m->set_from_compiled_inline_entry(m->adapter()->get_c2i_inline_entry());
1639 m->set_from_compiled_inline_ro_entry(m->adapter()->get_c2i_inline_ro_entry());
1640 }
1641 m->link_method(m, CHECK);
1642
1643 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1644 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1645 }
1646 }
1647 #endif
1648
1649 Klass* Method::check_non_bcp_klass(Klass* klass) {
1650 if (klass != nullptr && klass->class_loader() != nullptr) {
1651 if (klass->is_objArray_klass())
1652 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1653 return klass;
1654 }
1655 return nullptr;
1656 }
1657
1658
1659 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1660 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1661 // Code below does not work for native methods - they should never get rewritten anyway
1662 assert(!m->is_native(), "cannot rewrite native methods");
1663 // Allocate new Method*
1664 AccessFlags flags = m->access_flags();
1665
1666 ConstMethod* cm = m->constMethod();
1667 int checked_exceptions_len = cm->checked_exceptions_length();
1668 int localvariable_len = cm->localvariable_table_length();
1669 int exception_table_len = cm->exception_table_length();
1670 int method_parameters_len = cm->method_parameters_length();
1671 int method_annotations_len = cm->method_annotations_length();
1672 int parameter_annotations_len = cm->parameter_annotations_length();
1673 int type_annotations_len = cm->type_annotations_length();
1674 int default_annotations_len = cm->default_annotations_length();
1675
1676 InlineTableSizes sizes(
1677 localvariable_len,
1678 new_compressed_linenumber_size,
1679 exception_table_len,
1680 checked_exceptions_len,
1681 method_parameters_len,
1682 cm->generic_signature_index(),
1683 method_annotations_len,
1684 parameter_annotations_len,
1685 type_annotations_len,
1686 default_annotations_len,
1687 0);
1688
1689 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1690 Method* newm_oop = Method::allocate(loader_data,
1691 new_code_length,
1692 flags,
1693 &sizes,
1694 m->method_type(),
1695 m->name(),
1696 CHECK_(methodHandle()));
1697 methodHandle newm (THREAD, newm_oop);
1698
1699 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1700 ConstMethod* newcm = newm->constMethod();
1701 int new_const_method_size = newm->constMethod()->size();
1702
1703 // This works because the source and target are both Methods. Some compilers
1704 // (e.g., clang) complain that the target vtable pointer will be stomped,
1705 // so cast away newm()'s and m()'s Methodness.
1706 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1707
1708 // Create shallow copy of ConstMethod.
1709 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1710
1711 // Reset correct method/const method, method size, and parameter info
1712 newm->set_constMethod(newcm);
1713 newm->constMethod()->set_code_size(new_code_length);
1714 newm->constMethod()->set_constMethod_size(new_const_method_size);
1715 assert(newm->code_size() == new_code_length, "check");
1716 assert(newm->method_parameters_length() == method_parameters_len, "check");
1717 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1718 assert(newm->exception_table_length() == exception_table_len, "check");
1719 assert(newm->localvariable_table_length() == localvariable_len, "check");
1720 // Copy new byte codes
1721 memcpy(newm->code_base(), new_code, new_code_length);
1722 // Copy line number table
1723 if (new_compressed_linenumber_size > 0) {
1724 memcpy(newm->compressed_linenumber_table(),
1725 new_compressed_linenumber_table,
1726 new_compressed_linenumber_size);
1727 }
1728 // Copy method_parameters
1729 if (method_parameters_len > 0) {
1730 memcpy(newm->method_parameters_start(),
1731 m->method_parameters_start(),
1732 method_parameters_len * sizeof(MethodParametersElement));
1733 }
1734 // Copy checked_exceptions
1735 if (checked_exceptions_len > 0) {
1736 memcpy(newm->checked_exceptions_start(),
1737 m->checked_exceptions_start(),
1738 checked_exceptions_len * sizeof(CheckedExceptionElement));
1739 }
1740 // Copy exception table
1741 if (exception_table_len > 0) {
1742 memcpy(newm->exception_table_start(),
1743 m->exception_table_start(),
1744 exception_table_len * sizeof(ExceptionTableElement));
1745 }
1746 // Copy local variable number table
1747 if (localvariable_len > 0) {
1748 memcpy(newm->localvariable_table_start(),
1749 m->localvariable_table_start(),
1750 localvariable_len * sizeof(LocalVariableTableElement));
1751 }
1752 // Copy stackmap table
1753 if (m->has_stackmap_table()) {
1754 int code_attribute_length = m->stackmap_data()->length();
1755 Array<u1>* stackmap_data =
1756 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1757 memcpy((void*)stackmap_data->adr_at(0),
1758 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1759 newm->set_stackmap_data(stackmap_data);
1760 }
1761
1762 // copy annotations over to new method
1763 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1764 return newm;
1765 }
1766
1767 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1768 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1769 // because we are not loading from core libraries
1770 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1771 // which does not use the class default class loader so we check for its loader here
1772 const InstanceKlass* ik = InstanceKlass::cast(holder);
1773 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1774 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1775 }
1776
1777 // see if the klass name is well-known:
1778 Symbol* klass_name = ik->name();
1779 vmSymbolID id = vmSymbols::find_sid(klass_name);
1780 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1781 return id;
1782 } else {
1783 return vmSymbolID::NO_SID;
1784 }
1785 }
1786
1787 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1788 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1789 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1790 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1791 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1792
1793 // the klass name is well-known:
1794 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1795 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1796
1797 // ditto for method and signature:
1798 vmSymbolID name_id = vmSymbols::find_sid(name());
1799 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1800 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1801 && name_id == vmSymbolID::NO_SID) {
1802 return;
1803 }
1804 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1805 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1806 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1807 && sig_id == vmSymbolID::NO_SID) {
1808 return;
1809 }
1810
1811 u2 flags = access_flags().as_method_flags();
1812 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1813 if (id != vmIntrinsics::_none) {
1814 set_intrinsic_id(id);
1815 if (id == vmIntrinsics::_Class_cast) {
1816 // Even if the intrinsic is rejected, we want to inline this simple method.
1817 set_force_inline();
1818 }
1819 return;
1820 }
1821
1822 // A few slightly irregular cases:
1823 switch (klass_id) {
1824 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1825 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1826 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1827 if (!is_native()) break;
1828 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1829 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1830 id = vmIntrinsics::_none;
1831 break;
1832
1833 default:
1834 break;
1835 }
1836
1837 if (id != vmIntrinsics::_none) {
1838 // Set up its iid. It is an alias method.
1839 set_intrinsic_id(id);
1840 return;
1841 }
1842 }
1843
1844 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1845 if (!THREAD->can_call_java()) {
1846 // There is nothing useful this routine can do from within the Compile thread.
1847 // Hopefully, the signature contains only well-known classes.
1848 // We could scan for this and return true/false, but the caller won't care.
1849 return false;
1850 }
1851 bool sig_is_loaded = true;
1852 ResourceMark rm(THREAD);
1853 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1854 if (ss.is_reference()) {
1855 // load everything, including arrays "[Lfoo;"
1856 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1857 // We are loading classes eagerly. If a ClassNotFoundException or
1858 // a LinkageError was generated, be sure to ignore it.
1859 if (HAS_PENDING_EXCEPTION) {
1860 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1861 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1862 CLEAR_PENDING_EXCEPTION;
1863 } else {
1864 return false;
1865 }
1866 }
1867 if( klass == nullptr) { sig_is_loaded = false; }
1868 }
1869 }
1870 return sig_is_loaded;
1871 }
1872
1873 // Exposed so field engineers can debug VM
1874 void Method::print_short_name(outputStream* st) const {
1875 ResourceMark rm;
1876 #ifdef PRODUCT
1877 st->print(" %s::", method_holder()->external_name());
1878 #else
1879 st->print(" %s::", method_holder()->internal_name());
1880 #endif
1881 name()->print_symbol_on(st);
1882 if (WizardMode) signature()->print_symbol_on(st);
1883 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1884 MethodHandles::print_as_basic_type_signature_on(st, signature());
1885 }
1886
1887 // Comparer for sorting an object array containing
1888 // Method*s.
1889 static int method_comparator(Method* a, Method* b) {
1890 return a->name()->fast_compare(b->name());
1891 }
1892
1893 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1894 // default_methods also uses this without the ordering for fast find_method
1895 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1896 int length = methods->length();
1897 if (length > 1) {
1898 if (func == nullptr) {
1899 func = method_comparator;
1900 }
1901 {
1902 NoSafepointVerifier nsv;
1903 QuickSort::sort(methods->data(), length, func);
1904 }
1905 // Reset method ordering
1906 if (set_idnums) {
1907 for (u2 i = 0; i < length; i++) {
1908 Method* m = methods->at(i);
1909 m->set_method_idnum(i);
1910 m->set_orig_method_idnum(i);
1911 }
1912 }
1913 }
1914 }
1915
1916 //-----------------------------------------------------------------------------------
1917 // Non-product code unless JVM/TI needs it
1918
1919 #if !defined(PRODUCT) || INCLUDE_JVMTI
1920 class SignatureTypePrinter : public SignatureTypeNames {
1921 private:
1922 outputStream* _st;
1923 bool _use_separator;
1924
1925 void type_name(const char* name) {
1926 if (_use_separator) _st->print(", ");
1927 _st->print("%s", name);
1928 _use_separator = true;
1929 }
1930
1931 public:
1932 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1933 _st = st;
1934 _use_separator = false;
1935 }
1936
1937 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1938 void print_returntype() { _use_separator = false; do_type(return_type()); }
1939 };
1940
1941
1942 void Method::print_name(outputStream* st) const {
1943 Thread *thread = Thread::current();
1944 ResourceMark rm(thread);
1945 st->print("%s ", is_static() ? "static" : "virtual");
1946 if (WizardMode) {
1947 st->print("%s.", method_holder()->internal_name());
1948 name()->print_symbol_on(st);
1949 signature()->print_symbol_on(st);
1950 } else {
1951 SignatureTypePrinter sig(signature(), st);
1952 sig.print_returntype();
1953 st->print(" %s.", method_holder()->internal_name());
1954 name()->print_symbol_on(st);
1955 st->print("(");
1956 sig.print_parameters();
1957 st->print(")");
1958 }
1959 }
1960 #endif // !PRODUCT || INCLUDE_JVMTI
1961
1962
1963 void Method::print_codes_on(outputStream* st, int flags) const {
1964 print_codes_on(0, code_size(), st, flags);
1965 }
1966
1967 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1968 Thread *thread = Thread::current();
1969 ResourceMark rm(thread);
1970 methodHandle mh (thread, (Method*)this);
1971 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1972 }
1973
1974 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1975 _bci = 0;
1976 _line = 0;
1977 };
1978
1979 bool CompressedLineNumberReadStream::read_pair() {
1980 jubyte next = read_byte();
1981 // Check for terminator
1982 if (next == 0) return false;
1983 if (next == 0xFF) {
1984 // Escape character, regular compression used
1985 _bci += read_signed_int();
1986 _line += read_signed_int();
1987 } else {
1988 // Single byte compression used
1989 _bci += next >> 3;
1990 _line += next & 0x7;
1991 }
1992 return true;
1993 }
1994
1995 #if INCLUDE_JVMTI
1996
1997 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1998 BreakpointInfo* bp = method_holder()->breakpoints();
1999 for (; bp != nullptr; bp = bp->next()) {
2000 if (bp->match(this, bci)) {
2001 return bp->orig_bytecode();
2002 }
2003 }
2004 {
2005 ResourceMark rm;
2006 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
2007 }
2008 return Bytecodes::_shouldnotreachhere;
2009 }
2010
2011 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
2012 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
2013 BreakpointInfo* bp = method_holder()->breakpoints();
2014 for (; bp != nullptr; bp = bp->next()) {
2015 if (bp->match(this, bci)) {
2016 bp->set_orig_bytecode(code);
2017 // and continue, in case there is more than one
2018 }
2019 }
2020 }
2021
2022 void Method::set_breakpoint(int bci) {
2023 InstanceKlass* ik = method_holder();
2024 BreakpointInfo *bp = new BreakpointInfo(this, bci);
2025 bp->set_next(ik->breakpoints());
2026 ik->set_breakpoints(bp);
2027 // do this last:
2028 bp->set(this);
2029 }
2030
2031 static void clear_matches(Method* m, int bci) {
2032 InstanceKlass* ik = m->method_holder();
2033 BreakpointInfo* prev_bp = nullptr;
2034 BreakpointInfo* next_bp;
2035 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
2036 next_bp = bp->next();
2037 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
2038 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
2039 // do this first:
2040 bp->clear(m);
2041 // unhook it
2042 if (prev_bp != nullptr)
2043 prev_bp->set_next(next_bp);
2044 else
2045 ik->set_breakpoints(next_bp);
2046 delete bp;
2047 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
2048 // at same location. So we have multiple matching (method_index and bci)
2049 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
2050 // breakpoint for clear_breakpoint request and keep all other method versions
2051 // BreakpointInfo for future clear_breakpoint request.
2052 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
2053 // which is being called when class is unloaded. We delete all the Breakpoint
2054 // information for all versions of method. We may not correctly restore the original
2055 // bytecode in all method versions, but that is ok. Because the class is being unloaded
2056 // so these methods won't be used anymore.
2057 if (bci >= 0) {
2058 break;
2059 }
2060 } else {
2061 // This one is a keeper.
2062 prev_bp = bp;
2063 }
2064 }
2065 }
2066
2067 void Method::clear_breakpoint(int bci) {
2068 assert(bci >= 0, "");
2069 clear_matches(this, bci);
2070 }
2071
2072 void Method::clear_all_breakpoints() {
2073 clear_matches(this, -1);
2074 }
2075
2076 #endif // INCLUDE_JVMTI
2077
2078 int Method::highest_osr_comp_level() const {
2079 const MethodCounters* mcs = method_counters();
2080 if (mcs != nullptr) {
2081 return mcs->highest_osr_comp_level();
2082 } else {
2083 return CompLevel_none;
2084 }
2085 }
2086
2087 void Method::set_highest_comp_level(int level) {
2088 MethodCounters* mcs = method_counters();
2089 if (mcs != nullptr) {
2090 mcs->set_highest_comp_level(level);
2091 }
2092 }
2093
2094 void Method::set_highest_osr_comp_level(int level) {
2095 MethodCounters* mcs = method_counters();
2096 if (mcs != nullptr) {
2097 mcs->set_highest_osr_comp_level(level);
2098 }
2099 }
2100
2101 #if INCLUDE_JVMTI
2102
2103 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2104 _bci = bci;
2105 _name_index = m->name_index();
2106 _signature_index = m->signature_index();
2107 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2108 if (_orig_bytecode == Bytecodes::_breakpoint)
2109 _orig_bytecode = m->orig_bytecode_at(_bci);
2110 _next = nullptr;
2111 }
2112
2113 void BreakpointInfo::set(Method* method) {
2114 #ifdef ASSERT
2115 {
2116 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2117 if (code == Bytecodes::_breakpoint)
2118 code = method->orig_bytecode_at(_bci);
2119 assert(orig_bytecode() == code, "original bytecode must be the same");
2120 }
2121 #endif
2122 Thread *thread = Thread::current();
2123 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2124 method->incr_number_of_breakpoints(thread);
2125 {
2126 // Deoptimize all dependents on this method
2127 HandleMark hm(thread);
2128 methodHandle mh(thread, method);
2129 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2130 }
2131 }
2132
2133 void BreakpointInfo::clear(Method* method) {
2134 *method->bcp_from(_bci) = orig_bytecode();
2135 assert(method->number_of_breakpoints() > 0, "must not go negative");
2136 method->decr_number_of_breakpoints(Thread::current());
2137 }
2138
2139 #endif // INCLUDE_JVMTI
2140
2141 // jmethodID handling
2142 // jmethodIDs are 64-bit integers that will never run out and are mapped in a table
2143 // to their Method and vice versa. If JNI code has access to stale jmethodID, this
2144 // wastes no memory but the Method* returned is null.
2145
2146 // Add a method id to the jmethod_ids
2147 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2148 // Have to add jmethod_ids() to class loader data thread-safely.
2149 // Also have to add the method to the InstanceKlass list safely, which the lock
2150 // protects as well.
2151 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2152 jmethodID jmid = JmethodIDTable::make_jmethod_id(m);
2153 assert(jmid != nullptr, "must be created");
2154
2155 // Add to growable array in CLD.
2156 cld->add_jmethod_id(jmid);
2157 return jmid;
2158 }
2159
2160 // This looks in the InstanceKlass cache, then calls back to make_jmethod_id if not found.
2161 jmethodID Method::jmethod_id() {
2162 return method_holder()->get_jmethod_id(this);
2163 }
2164
2165 // Get the Method out of the table given the method id.
2166 Method* Method::resolve_jmethod_id(jmethodID mid) {
2167 assert(mid != nullptr, "JNI method id should not be null");
2168 return JmethodIDTable::resolve_jmethod_id(mid);
2169 }
2170
2171 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2172 // Can't assert the method_holder is the same because the new method has the
2173 // scratch method holder.
2174 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2175 == new_method->method_holder()->class_loader() ||
2176 new_method->method_holder()->class_loader() == nullptr, // allow substitution to Unsafe method
2177 "changing to a different class loader");
2178 JmethodIDTable::change_method_associated_with_jmethod_id(jmid, new_method);
2179 }
2180
2181 // If there's a jmethodID for this method, clear the Method
2182 // but leave jmethodID for this method in the table.
2183 // It's deallocated with class unloading.
2184 void Method::clear_jmethod_id() {
2185 jmethodID mid = method_holder()->jmethod_id_or_null(this);
2186 if (mid != nullptr) {
2187 JmethodIDTable::clear_jmethod_id(mid, this);
2188 }
2189 }
2190
2191 bool Method::validate_jmethod_id(jmethodID mid) {
2192 Method* m = resolve_jmethod_id(mid);
2193 assert(m != nullptr, "should be called with non-null method");
2194 InstanceKlass* ik = m->method_holder();
2195 ClassLoaderData* cld = ik->class_loader_data();
2196 if (cld->jmethod_ids() == nullptr) return false;
2197 return (cld->jmethod_ids()->contains(mid));
2198 }
2199
2200 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2201 if (mid == nullptr) return nullptr;
2202 Method* o = resolve_jmethod_id(mid);
2203 if (o == nullptr) {
2204 return nullptr;
2205 }
2206 // Method should otherwise be valid. Assert for testing.
2207 assert(is_valid_method(o), "should be valid jmethodid");
2208 // If the method's class holder object is unreferenced, but not yet marked as
2209 // unloaded, we need to return null here too because after a safepoint, its memory
2210 // will be reclaimed.
2211 return o->method_holder()->is_loader_alive() ? o : nullptr;
2212 }
2213
2214 void Method::set_on_stack(const bool value) {
2215 // Set both the method itself and its constant pool. The constant pool
2216 // on stack means some method referring to it is also on the stack.
2217 constants()->set_on_stack(value);
2218
2219 bool already_set = on_stack_flag();
2220 set_on_stack_flag(value);
2221 if (value && !already_set) {
2222 MetadataOnStackMark::record(this);
2223 }
2224 }
2225
2226 void Method::record_gc_epoch() {
2227 // If any method is on the stack in continuations, none of them can be reclaimed,
2228 // so save the marking cycle to check for the whole class in the cpCache.
2229 // The cpCache is writeable.
2230 constants()->cache()->record_gc_epoch();
2231 }
2232
2233 bool Method::has_method_vptr(const void* ptr) {
2234 Method m;
2235 // This assumes that the vtbl pointer is the first word of a C++ object.
2236 return dereference_vptr(&m) == dereference_vptr(ptr);
2237 }
2238
2239 // Check that this pointer is valid by checking that the vtbl pointer matches
2240 bool Method::is_valid_method(const Method* m) {
2241 if (m == nullptr) {
2242 return false;
2243 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2244 // Quick sanity check on pointer.
2245 return false;
2246 } else if (!os::is_readable_range(m, m + 1)) {
2247 return false;
2248 } else if (m->in_aot_cache()) {
2249 return CppVtables::is_valid_shared_method(m);
2250 } else if (Metaspace::contains_non_shared(m)) {
2251 return has_method_vptr((const void*)m);
2252 } else {
2253 return false;
2254 }
2255 }
2256
2257 bool Method::is_scalarized_arg(int idx) const {
2258 if (!has_scalarized_args()) {
2259 return false;
2260 }
2261 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID
2262 int depth = 0;
2263 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2264 for (int i = 0; i < sig->length(); i++) {
2265 BasicType bt = sig->at(i)._bt;
2266 if (bt == T_METADATA) {
2267 depth++;
2268 }
2269 if (idx == 0) {
2270 break; // Argument found
2271 }
2272 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2273 depth--;
2274 }
2275 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2276 idx--; // Advance to next argument
2277 }
2278 }
2279 return depth != 0;
2280 }
2281
2282 // Printing
2283
2284 #ifndef PRODUCT
2285
2286 void Method::print_on(outputStream* st) const {
2287 ResourceMark rm;
2288 assert(is_method(), "must be method");
2289 st->print_cr("%s", internal_name());
2290 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2291 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2292 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2293 constants()->print_value_on(st); st->cr();
2294 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr();
2295 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2296 st->print (" - name: "); name()->print_value_on(st); st->cr();
2297 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2298 st->print_cr(" - max stack: %d", max_stack());
2299 st->print_cr(" - max locals: %d", max_locals());
2300 st->print_cr(" - size of params: %d", size_of_parameters());
2301 st->print_cr(" - method size: %d", method_size());
2302 if (intrinsic_id() != vmIntrinsics::_none)
2303 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2304 if (highest_comp_level() != CompLevel_none)
2305 st->print_cr(" - highest level: %d", highest_comp_level());
2306 st->print_cr(" - vtable index: %d", _vtable_index);
2307 #ifdef ASSERT
2308 if (valid_itable_index())
2309 st->print_cr(" - itable index: %d", itable_index());
2310 #endif
2311 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2312 st->print( " - adapters: ");
2313 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2314 if (a == nullptr)
2315 st->print_cr(PTR_FORMAT, p2i(a));
2316 else
2317 a->print_adapter_on(st);
2318 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2319 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2320 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry()));
2321 st->print_cr(" - code size: %d", code_size());
2322 if (code_size() != 0) {
2323 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2324 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2325 }
2326 if (method_data() != nullptr) {
2327 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2328 }
2329 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2330 if (checked_exceptions_length() > 0) {
2331 CheckedExceptionElement* table = checked_exceptions_start();
2332 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2333 if (Verbose) {
2334 for (int i = 0; i < checked_exceptions_length(); i++) {
2335 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2336 }
2337 }
2338 }
2339 if (has_linenumber_table()) {
2340 u_char* table = compressed_linenumber_table();
2341 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2342 if (Verbose) {
2343 CompressedLineNumberReadStream stream(table);
2344 while (stream.read_pair()) {
2345 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2346 }
2347 }
2348 }
2349 st->print_cr(" - localvar length: %d", localvariable_table_length());
2350 if (localvariable_table_length() > 0) {
2351 LocalVariableTableElement* table = localvariable_table_start();
2352 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2353 if (Verbose) {
2354 for (int i = 0; i < localvariable_table_length(); i++) {
2355 int bci = table[i].start_bci;
2356 int len = table[i].length;
2357 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2358 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2359 int slot = table[i].slot;
2360 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2361 }
2362 }
2363 }
2364 if (code() != nullptr) {
2365 st->print (" - compiled code: ");
2366 code()->print_value_on(st);
2367 }
2368 if (is_native()) {
2369 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2370 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2371 }
2372 }
2373
2374 void Method::print_linkage_flags(outputStream* st) {
2375 access_flags().print_on(st);
2376 if (is_default_method()) {
2377 st->print("default ");
2378 }
2379 if (is_overpass()) {
2380 st->print("overpass ");
2381 }
2382 }
2383 #endif //PRODUCT
2384
2385 void Method::print_value_on(outputStream* st) const {
2386 assert(is_method(), "must be method");
2387 st->print("%s", internal_name());
2388 print_address_on(st);
2389 st->print(" ");
2390 if (WizardMode) access_flags().print_on(st);
2391 name()->print_value_on(st);
2392 st->print(" ");
2393 signature()->print_value_on(st);
2394 st->print(" in ");
2395 method_holder()->print_value_on(st);
2396 if (WizardMode) st->print("#%d", _vtable_index);
2397 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2398 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2399 }
2400
2401 // Verification
2402
2403 void Method::verify_on(outputStream* st) {
2404 guarantee(is_method(), "object must be method");
2405 guarantee(constants()->is_constantPool(), "should be constant pool");
2406 MethodData* md = method_data();
2407 guarantee(md == nullptr ||
2408 md->is_methodData(), "should be method data");
2409 }