1 /*
2 * Copyright (c) 1997, 2026, 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_inline_ro_entry() {
176 assert(adapter() != nullptr, "must have");
177 return adapter()->get_c2i_inline_ro_entry();
178 }
179
180 address Method::get_c2i_unverified_entry() {
181 if (is_abstract()) {
182 return SharedRuntime::get_handle_wrong_method_abstract_stub();
183 }
184 assert(adapter() != nullptr, "must have");
185 return adapter()->get_c2i_unverified_entry();
186 }
187
188 address Method::get_c2i_unverified_inline_entry() {
189 assert(adapter() != nullptr, "must have");
190 return adapter()->get_c2i_unverified_inline_entry();
191 }
192
193 address Method::get_c2i_no_clinit_check_entry() {
194 if (is_abstract()) {
195 return nullptr;
196 }
197 assert(VM_Version::supports_fast_class_init_checks(), "");
198 assert(adapter() != nullptr, "must have");
199 return adapter()->get_c2i_no_clinit_check_entry();
200 }
201
202 char* Method::name_and_sig_as_C_string() const {
203 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
204 }
205
206 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
207 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
208 }
209
210 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
211 const char* klass_name = klass->external_name();
212 int klass_name_len = (int)strlen(klass_name);
213 int method_name_len = method_name->utf8_length();
214 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
215 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
216 strcpy(dest, klass_name);
217 dest[klass_name_len] = '.';
218 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
219 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
220 dest[len] = 0;
221 return dest;
222 }
223
224 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
225 Symbol* klass_name = klass->name();
226 klass_name->as_klass_external_name(buf, size);
227 int len = (int)strlen(buf);
228
229 if (len < size - 1) {
230 buf[len++] = '.';
231
232 method_name->as_C_string(&(buf[len]), size - len);
233 len = (int)strlen(buf);
234
235 signature->as_C_string(&(buf[len]), size - len);
236 }
237
238 return buf;
239 }
240
241 const char* Method::external_name() const {
242 return external_name(constants()->pool_holder(), name(), signature());
243 }
244
245 void Method::print_external_name(outputStream *os) const {
246 print_external_name(os, constants()->pool_holder(), name(), signature());
247 }
248
249 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
250 stringStream ss;
251 print_external_name(&ss, klass, method_name, signature);
252 return ss.as_string();
253 }
254
255 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
256 signature->print_as_signature_external_return_type(os);
257 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
258 signature->print_as_signature_external_parameters(os);
259 os->print(")");
260 }
261
262 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
263 if (log_is_enabled(Debug, exceptions)) {
264 ResourceMark rm(THREAD);
265 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
266 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
267 }
268 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
269 // access exception table
270 ExceptionTable table(mh());
271 int length = table.length();
272 // iterate through all entries sequentially
273 constantPoolHandle pool(THREAD, mh->constants());
274 for (int i = 0; i < length; i ++) {
275 //reacquire the table in case a GC happened
276 ExceptionTable table(mh());
277 int beg_bci = table.start_pc(i);
278 int end_bci = table.end_pc(i);
279 assert(beg_bci <= end_bci, "inconsistent exception table");
280 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
281 beg_bci, end_bci);
282
283 if (beg_bci <= throw_bci && throw_bci < end_bci) {
284 // exception handler bci range covers throw_bci => investigate further
285 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
286
287 int handler_bci = table.handler_pc(i);
288 int klass_index = table.catch_type_index(i);
289 if (klass_index == 0) {
290 if (log_is_enabled(Info, exceptions)) {
291 ResourceMark rm(THREAD);
292 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
293 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
294 }
295 return handler_bci;
296 } else if (ex_klass == nullptr) {
297 // Is this even possible?
298 if (log_is_enabled(Info, exceptions)) {
299 ResourceMark rm(THREAD);
300 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
301 mh()->name()->as_C_string(), handler_bci);
302 }
303 return handler_bci;
304 } else {
305 if (log_is_enabled(Debug, exceptions)) {
306 ResourceMark rm(THREAD);
307 log_debug(exceptions)(" - resolving catch type \"%s\"",
308 pool->klass_name_at(klass_index)->as_C_string());
309 }
310 // we know the exception class => get the constraint class
311 // this may require loading of the constraint class; if verification
312 // fails or some other exception occurs, return handler_bci
313 Klass* k = pool->klass_at(klass_index, THREAD);
314 if (HAS_PENDING_EXCEPTION) {
315 if (log_is_enabled(Debug, exceptions)) {
316 ResourceMark rm(THREAD);
317 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
318 PENDING_EXCEPTION->klass()->external_name());
319 }
320 return handler_bci;
321 }
322 assert(k != nullptr, "klass not loaded");
323 if (ex_klass->is_subtype_of(k)) {
324 if (log_is_enabled(Info, exceptions)) {
325 ResourceMark rm(THREAD);
326 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
327 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
328 }
329 return handler_bci;
330 }
331 }
332 }
333 }
334
335 if (log_is_enabled(Debug, exceptions)) {
336 ResourceMark rm(THREAD);
337 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
338 ex_klass->external_name(), mh->name()->as_C_string());
339 }
340
341 return -1;
342 }
343
344 void Method::mask_for(int bci, InterpreterOopMap* mask) {
345 methodHandle h_this(Thread::current(), this);
346 mask_for(h_this, bci, mask);
347 }
348
349 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
350 assert(this_mh() == this, "Sanity");
351 method_holder()->mask_for(this_mh, bci, mask);
352 }
353
354 int Method::bci_from(address bcp) const {
355 if (is_native() && bcp == nullptr) {
356 return 0;
357 }
358 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
359 // may call this after interrupting a nested ResourceMark.
360 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
361 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
362
363 return int(bcp - code_base());
364 }
365
366
367 int Method::validate_bci(int bci) const {
368 // Called from the verifier, and should return -1 if not valid.
369 return ((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size())) ? bci : -1;
370 }
371
372 // Return bci if it appears to be a valid bcp
373 // Return -1 otherwise.
374 // Used by profiling code, when invalid data is a possibility.
375 // The caller is responsible for validating the Method* itself.
376 int Method::validate_bci_from_bcp(address bcp) const {
377 // keep bci as -1 if not a valid bci
378 int bci = -1;
379 if (bcp == nullptr || bcp == code_base()) {
380 // code_size() may return 0 and we allow 0 here
381 // the method may be native
382 bci = 0;
383 } else if (contains(bcp)) {
384 bci = int(bcp - code_base());
385 }
386 // Assert that if we have dodged any asserts, bci is negative.
387 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
388 return bci;
389 }
390
391 address Method::bcp_from(int bci) const {
392 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
393 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
394 address bcp = code_base() + bci;
395 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
396 return bcp;
397 }
398
399 address Method::bcp_from(address bcp) const {
400 if (is_native() && bcp == nullptr) {
401 return code_base();
402 } else {
403 return bcp;
404 }
405 }
406
407 int Method::size(bool is_native) {
408 // If native, then include pointers for native_function and signature_handler
409 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
410 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
411 return align_metadata_size(header_size() + extra_words);
412 }
413
414 Symbol* Method::klass_name() const {
415 return method_holder()->name();
416 }
417
418 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
419 log_trace(aot)("Iter(Method): %p", this);
420
421 if (!method_holder()->is_rewritten() || Arguments::is_valhalla_enabled()) {
422 it->push(&_constMethod, MetaspaceClosure::_writable);
423 } else {
424 it->push(&_constMethod);
425 }
426 it->push(&_adapter);
427 it->push(&_method_data);
428 it->push(&_method_counters);
429 NOT_PRODUCT(it->push(&_name);)
430 }
431
432 #if INCLUDE_CDS
433 // Attempt to return method to original state. Clear any pointers
434 // (to objects outside the shared spaces). We won't be able to predict
435 // where they should point in a new JVM. Further initialize some
436 // entries now in order allow them to be write protected later.
437
438 void Method::remove_unshareable_info() {
439 unlink_method();
440 if (method_data() != nullptr) {
441 method_data()->remove_unshareable_info();
442 }
443 if (method_counters() != nullptr) {
444 method_counters()->remove_unshareable_info();
445 }
446 if (CDSConfig::is_dumping_adapters() && _adapter != nullptr) {
447 _adapter->remove_unshareable_info();
448 _adapter = nullptr;
449 }
450 JFR_ONLY(REMOVE_METHOD_ID(this);)
451 }
452
453 void Method::restore_unshareable_info(TRAPS) {
454 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
455 if (method_data() != nullptr) {
456 method_data()->restore_unshareable_info(CHECK);
457 }
458 if (method_counters() != nullptr) {
459 method_counters()->restore_unshareable_info(CHECK);
460 }
461 if (_adapter != nullptr) {
462 assert(_adapter->is_linked(), "must be");
463 _from_compiled_entry = _adapter->get_c2i_entry();
464 _from_compiled_inline_entry = _adapter->get_c2i_inline_entry();
465 _from_compiled_inline_ro_entry = _adapter->get_c2i_inline_ro_entry();
466 }
467 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
468 }
469 #endif
470
471 void Method::set_vtable_index(int index) {
472 if (in_aot_cache() && !AOTMetaspace::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
473 // At runtime initialize_vtable 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.
476 return; // don't write into the shared class
477 } else {
478 _vtable_index = index;
479 }
480 }
481
482 void Method::set_itable_index(int index) {
483 if (in_aot_cache() && !AOTMetaspace::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
484 // At runtime initialize_itable is rerun as part of link_class_impl()
485 // for a shared class loaded by the non-boot loader to obtain the loader
486 // constraints based on the runtime classloaders' context. The dumptime
487 // itable index should be the same as the runtime index.
488 assert(_vtable_index == itable_index_max - index,
489 "archived itable index is different from runtime index");
490 return; // don't write into the shared class
491 } else {
492 _vtable_index = itable_index_max - index;
493 }
494 assert(valid_itable_index(), "");
495 }
496
497 // The RegisterNatives call being attempted tried to register with a method that
498 // is not native. Ask JVM TI what prefixes have been specified. Then check
499 // to see if the native method is now wrapped with the prefixes. See the
500 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
501 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
502 #if INCLUDE_JVMTI
503 ResourceMark rm(THREAD);
504 Method* method;
505 int name_len = name->utf8_length();
506 char* name_str = name->as_utf8();
507 int prefix_count;
508 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
509 for (int i = 0; i < prefix_count; i++) {
510 char* prefix = prefixes[i];
511 int prefix_len = (int)strlen(prefix);
512
513 // try adding this prefix to the method name and see if it matches another method name
514 int trial_len = name_len + prefix_len;
515 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
516 strcpy(trial_name_str, prefix);
517 strcat(trial_name_str, name_str);
518 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
519 if (trial_name == nullptr) {
520 continue; // no such symbol, so this prefix wasn't used, try the next prefix
521 }
522 method = k->lookup_method(trial_name, signature);
523 if (method == nullptr) {
524 continue; // signature doesn't match, try the next prefix
525 }
526 if (method->is_native()) {
527 method->set_is_prefixed_native();
528 return method; // wahoo, we found a prefixed version of the method, return it
529 }
530 // found as non-native, so prefix is good, add it, probably just need more prefixes
531 name_len = trial_len;
532 name_str = trial_name_str;
533 }
534 #endif // INCLUDE_JVMTI
535 return nullptr; // not found
536 }
537
538 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
539 Method* method = k->lookup_method(name, signature);
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("' name or signature does not match");
546 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
547 }
548 if (!method->is_native()) {
549 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
550 method = find_prefixed_native(k, name, signature, THREAD);
551 if (method == nullptr) {
552 ResourceMark rm(THREAD);
553 stringStream st;
554 st.print("Method '");
555 print_external_name(&st, k, name, signature);
556 st.print("' is not declared as native");
557 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
558 }
559 }
560
561 if (entry != nullptr) {
562 method->set_native_function(entry, native_bind_event_is_interesting);
563 } else {
564 method->clear_native_function();
565 }
566 if (log_is_enabled(Debug, jni, resolve)) {
567 ResourceMark rm(THREAD);
568 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
569 method->method_holder()->external_name(),
570 method->name()->as_C_string());
571 }
572 return true;
573 }
574
575 bool Method::was_executed_more_than(int n) {
576 // Invocation counter is reset when the Method* is compiled.
577 // If the method has compiled code we therefore assume it has
578 // be executed more than n times.
579 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
580 // interpreter doesn't bump invocation counter of trivial methods
581 // compiler does not bump invocation counter of compiled methods
582 return true;
583 }
584 else if ((method_counters() != nullptr &&
585 method_counters()->invocation_counter()->carry()) ||
586 (method_data() != nullptr &&
587 method_data()->invocation_counter()->carry())) {
588 // The carry bit is set when the counter overflows and causes
589 // a compilation to occur. We don't know how many times
590 // the counter has been reset, so we simply assume it has
591 // been executed more than n times.
592 return true;
593 } else {
594 return invocation_count() > n;
595 }
596 }
597
598 void Method::print_invocation_count(outputStream* st) {
599 //---< compose+print method return type, klass, name, and signature >---
600 if (is_static()) { st->print("static "); }
601 if (is_final()) { st->print("final "); }
602 if (is_synchronized()) { st->print("synchronized "); }
603 if (is_native()) { st->print("native "); }
604 st->print("%s::", method_holder()->external_name());
605 name()->print_symbol_on(st);
606 signature()->print_symbol_on(st);
607
608 if (WizardMode) {
609 // dump the size of the byte codes
610 st->print(" {%d}", code_size());
611 }
612 st->cr();
613
614 // Counting based on signed int counters tends to overflow with
615 // longer-running workloads on fast machines. The counters under
616 // consideration here, however, are limited in range by counting
617 // logic. See InvocationCounter:count_limit for example.
618 // No "overflow precautions" need to be implemented here.
619 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
620 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
621 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
622
623 if (method_data() != nullptr) {
624 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
625 }
626
627 #ifndef PRODUCT
628 if (CountCompiledCalls) {
629 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
630 }
631 #endif
632 }
633
634 MethodTrainingData* Method::training_data_or_null() const {
635 MethodCounters* mcs = method_counters();
636 if (mcs == nullptr) {
637 return nullptr;
638 } else {
639 MethodTrainingData* mtd = mcs->method_training_data();
640 if (mtd == mcs->method_training_data_sentinel()) {
641 return nullptr;
642 }
643 return mtd;
644 }
645 }
646
647 bool Method::init_training_data(MethodTrainingData* td) {
648 MethodCounters* mcs = method_counters();
649 if (mcs == nullptr) {
650 return false;
651 } else {
652 return mcs->init_method_training_data(td);
653 }
654 }
655
656 bool Method::install_training_method_data(const methodHandle& method) {
657 MethodTrainingData* mtd = MethodTrainingData::find(method);
658 if (mtd != nullptr && mtd->final_profile() != nullptr) {
659 AtomicAccess::replace_if_null(&method->_method_data, mtd->final_profile());
660 return true;
661 }
662 return false;
663 }
664
665 // Build a MethodData* object to hold profiling information collected on this
666 // method when requested.
667 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
668 if (install_training_method_data(method)) {
669 return;
670 }
671 // Do not profile the method if metaspace has hit an OOM previously
672 // allocating profiling data. Callers clear pending exception so don't
673 // add one here.
674 if (ClassLoaderDataGraph::has_metaspace_oom()) {
675 return;
676 }
677
678 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
679 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
680 if (HAS_PENDING_EXCEPTION) {
681 CompileBroker::log_metaspace_failure();
682 ClassLoaderDataGraph::set_metaspace_oom(true);
683 return; // return the exception (which is cleared)
684 }
685
686 if (!AtomicAccess::replace_if_null(&method->_method_data, method_data)) {
687 MetadataFactory::free_metadata(loader_data, method_data);
688 return;
689 }
690
691 if (PrintMethodData && (Verbose || WizardMode)) {
692 ResourceMark rm(THREAD);
693 tty->print("build_profiling_method_data for ");
694 method->print_name(tty);
695 tty->cr();
696 // At the end of the run, the MDO, full of data, will be dumped.
697 }
698 }
699
700 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
701 // Do not profile the method if metaspace has hit an OOM previously
702 if (ClassLoaderDataGraph::has_metaspace_oom()) {
703 return nullptr;
704 }
705
706 methodHandle mh(current, m);
707 MethodCounters* counters;
708 if (current->is_Java_thread()) {
709 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
710 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
711 // if needed.
712 counters = MethodCounters::allocate_with_exception(mh, THREAD);
713 if (HAS_PENDING_EXCEPTION) {
714 CLEAR_PENDING_EXCEPTION;
715 }
716 } else {
717 // Call metaspace allocation that doesn't throw exception if the
718 // current thread isn't a JavaThread, ie. the VMThread.
719 counters = MethodCounters::allocate_no_exception(mh);
720 }
721
722 if (counters == nullptr) {
723 CompileBroker::log_metaspace_failure();
724 ClassLoaderDataGraph::set_metaspace_oom(true);
725 return nullptr;
726 }
727
728 if (!mh->init_method_counters(counters)) {
729 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
730 }
731
732 return mh->method_counters();
733 }
734
735 bool Method::init_method_counters(MethodCounters* counters) {
736 // Try to install a pointer to MethodCounters, return true on success.
737 return AtomicAccess::replace_if_null(&_method_counters, counters);
738 }
739
740 void Method::set_exception_handler_entered(int handler_bci) {
741 if (ProfileExceptionHandlers) {
742 MethodData* mdo = method_data();
743 if (mdo != nullptr) {
744 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
745 handler_data.set_exception_handler_entered();
746 }
747 }
748 }
749
750 int Method::extra_stack_words() {
751 // not an inline function, to avoid a header dependency on Interpreter
752 return extra_stack_entries() * Interpreter::stackElementSize;
753 }
754
755 // InlineKlass the method is declared to return. This must not
756 // safepoint as it is called with references live on the stack at
757 // locations the GC is unaware of.
758 InlineKlass* Method::returns_inline_type() const {
759 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
760 if (is_native()) {
761 return nullptr;
762 }
763 NoSafepointVerifier nsv;
764 SignatureStream ss(signature());
765 ss.skip_to_return_type();
766 return ss.as_inline_klass(method_holder());
767 }
768
769 bool Method::compute_has_loops_flag() {
770 BytecodeStream bcs(methodHandle(Thread::current(), this));
771 Bytecodes::Code bc;
772
773 while ((bc = bcs.next()) >= 0) {
774 switch (bc) {
775 case Bytecodes::_ifeq:
776 case Bytecodes::_ifnull:
777 case Bytecodes::_iflt:
778 case Bytecodes::_ifle:
779 case Bytecodes::_ifne:
780 case Bytecodes::_ifnonnull:
781 case Bytecodes::_ifgt:
782 case Bytecodes::_ifge:
783 case Bytecodes::_if_icmpeq:
784 case Bytecodes::_if_icmpne:
785 case Bytecodes::_if_icmplt:
786 case Bytecodes::_if_icmpgt:
787 case Bytecodes::_if_icmple:
788 case Bytecodes::_if_icmpge:
789 case Bytecodes::_if_acmpeq:
790 case Bytecodes::_if_acmpne:
791 case Bytecodes::_goto:
792 case Bytecodes::_jsr:
793 if (bcs.dest() < bcs.next_bci()) {
794 return set_has_loops();
795 }
796 break;
797
798 case Bytecodes::_goto_w:
799 case Bytecodes::_jsr_w:
800 if (bcs.dest_w() < bcs.next_bci()) {
801 return set_has_loops();
802 }
803 break;
804
805 case Bytecodes::_lookupswitch: {
806 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
807 if (lookupswitch.default_offset() < 0) {
808 return set_has_loops();
809 } else {
810 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
811 LookupswitchPair pair = lookupswitch.pair_at(i);
812 if (pair.offset() < 0) {
813 return set_has_loops();
814 }
815 }
816 }
817 break;
818 }
819 case Bytecodes::_tableswitch: {
820 Bytecode_tableswitch tableswitch(this, bcs.bcp());
821 if (tableswitch.default_offset() < 0) {
822 return set_has_loops();
823 } else {
824 for (int i = 0; i < tableswitch.length(); ++i) {
825 if (tableswitch.dest_offset_at(i) < 0) {
826 return set_has_loops();
827 }
828 }
829 }
830 break;
831 }
832 default:
833 break;
834 }
835 }
836
837 _flags.set_has_loops_flag_init(true);
838 return false;
839 }
840
841 bool Method::is_final_method(AccessFlags class_access_flags) const {
842 // or "does_not_require_vtable_entry"
843 // default method or overpass can occur, is not final (reuses vtable entry)
844 // private methods in classes get vtable entries for backward class compatibility.
845 if (is_overpass() || is_default_method()) return false;
846 return is_final() || class_access_flags.is_final();
847 }
848
849 bool Method::is_final_method() const {
850 return is_final_method(method_holder()->access_flags());
851 }
852
853 bool Method::is_default_method() const {
854 if (method_holder() != nullptr &&
855 method_holder()->is_interface() &&
856 !is_abstract() && !is_private()) {
857 return true;
858 } else {
859 return false;
860 }
861 }
862
863 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
864 if (is_final_method(class_access_flags)) return true;
865 #ifdef ASSERT
866 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
867 if (class_access_flags.is_interface()) {
868 ResourceMark rm;
869 assert(is_nonv == is_static() || is_nonv == is_private(),
870 "nonvirtual unexpected for non-static, non-private: %s",
871 name_and_sig_as_C_string());
872 }
873 #endif
874 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
875 return vtable_index() == nonvirtual_vtable_index;
876 }
877
878 bool Method::can_be_statically_bound() const {
879 return can_be_statically_bound(method_holder()->access_flags());
880 }
881
882 bool Method::can_be_statically_bound(InstanceKlass* context) const {
883 return (method_holder() == context) && can_be_statically_bound();
884 }
885
886 /**
887 * Returns false if this is one of specially treated methods for
888 * which we have to provide stack trace in throw in compiled code.
889 * Returns true otherwise.
890 */
891 bool Method::can_omit_stack_trace() {
892 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
893 return false; // All methods in sun.invoke.util.ValueConversions
894 }
895 return true;
896 }
897
898 bool Method::is_accessor() const {
899 return is_getter() || is_setter();
900 }
901
902 bool Method::is_getter() const {
903 if (code_size() != 5) return false;
904 if (size_of_parameters() != 1) return false;
905 if (java_code_at(0) != Bytecodes::_aload_0) return false;
906 if (java_code_at(1) != Bytecodes::_getfield) return false;
907 switch (java_code_at(4)) {
908 case Bytecodes::_ireturn:
909 case Bytecodes::_lreturn:
910 case Bytecodes::_freturn:
911 case Bytecodes::_dreturn:
912 case Bytecodes::_areturn:
913 break;
914 default:
915 return false;
916 }
917 if (has_scalarized_return()) {
918 // Don't treat this as (trivial) getter method because the
919 // inline type should be returned in a scalarized form.
920 return false;
921 }
922 return true;
923 }
924
925 bool Method::is_setter() const {
926 if (code_size() != 6) return false;
927 if (java_code_at(0) != Bytecodes::_aload_0) return false;
928 switch (java_code_at(1)) {
929 case Bytecodes::_iload_1:
930 case Bytecodes::_aload_1:
931 case Bytecodes::_fload_1:
932 if (size_of_parameters() != 2) return false;
933 break;
934 case Bytecodes::_dload_1:
935 case Bytecodes::_lload_1:
936 if (size_of_parameters() != 3) return false;
937 break;
938 default:
939 return false;
940 }
941 if (java_code_at(2) != Bytecodes::_putfield) return false;
942 if (java_code_at(5) != Bytecodes::_return) return false;
943 if (has_scalarized_args()) {
944 // Don't treat this as (trivial) setter method because the
945 // inline type argument should be passed in a scalarized form.
946 return false;
947 }
948 return true;
949 }
950
951 bool Method::is_constant_getter() const {
952 int last_index = code_size() - 1;
953 // Check if the first 1-3 bytecodes are a constant push
954 // and the last bytecode is a return.
955 return (2 <= code_size() && code_size() <= 4 &&
956 Bytecodes::is_const(java_code_at(0)) &&
957 Bytecodes::length_for(java_code_at(0)) == last_index &&
958 Bytecodes::is_return(java_code_at(last_index)) &&
959 !has_scalarized_args());
960 }
961
962 bool Method::is_class_initializer() const {
963 // For classfiles version 51 or greater, ensure that the clinit method is
964 // static. Non-static methods with the name "<clinit>" are not static
965 // initializers. (older classfiles exempted for backward compatibility)
966 return (name() == vmSymbols::class_initializer_name() &&
967 (is_static() ||
968 method_holder()->major_version() < 51));
969 }
970
971 // A method named <init>, is a classic object constructor.
972 bool Method::is_object_constructor() const {
973 return name() == vmSymbols::object_initializer_name();
974 }
975
976 bool Method::needs_clinit_barrier() const {
977 return is_static() && !method_holder()->is_initialized();
978 }
979
980 bool Method::is_object_wait0() const {
981 return klass_name() == vmSymbols::java_lang_Object()
982 && name() == vmSymbols::wait_name();
983 }
984
985 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
986 int length = method->checked_exceptions_length();
987 if (length == 0) { // common case
988 return objArrayHandle(THREAD, Universe::the_empty_class_array());
989 } else {
990 methodHandle h_this(THREAD, method);
991 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
992 objArrayHandle mirrors (THREAD, m_oop);
993 for (int i = 0; i < length; i++) {
994 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
995 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
996 if (log_is_enabled(Warning, exceptions) &&
997 !k->is_subclass_of(vmClasses::Throwable_klass())) {
998 ResourceMark rm(THREAD);
999 log_warning(exceptions)(
1000 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
1001 k->external_name(), method->external_name());
1002 }
1003 mirrors->obj_at_put(i, k->java_mirror());
1004 }
1005 return mirrors;
1006 }
1007 };
1008
1009
1010 int Method::line_number_from_bci(int bci) const {
1011 int best_bci = 0;
1012 int best_line = -1;
1013 if (bci == SynchronizationEntryBCI) bci = 0;
1014 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
1015 // The line numbers are a short array of 2-tuples [start_pc, line_number].
1016 // Not necessarily sorted and not necessarily one-to-one.
1017 CompressedLineNumberReadStream stream(compressed_linenumber_table());
1018 while (stream.read_pair()) {
1019 if (stream.bci() == bci) {
1020 // perfect match
1021 return stream.line();
1022 } else {
1023 // update best_bci/line
1024 if (stream.bci() < bci && stream.bci() >= best_bci) {
1025 best_bci = stream.bci();
1026 best_line = stream.line();
1027 }
1028 }
1029 }
1030 }
1031 return best_line;
1032 }
1033
1034
1035 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1036 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
1037 Thread *thread = Thread::current();
1038 Symbol* klass_name = constants()->klass_name_at(klass_index);
1039 Handle loader(thread, method_holder()->class_loader());
1040 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr;
1041 } else {
1042 return true;
1043 }
1044 }
1045
1046
1047 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1048 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1049 if (must_be_resolved) {
1050 // Make sure klass is resolved in constantpool.
1051 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
1052 return false;
1053 }
1054 }
1055 return is_klass_loaded_by_klass_index(klass_index);
1056 }
1057
1058
1059 void Method::set_native_function(address function, bool post_event_flag) {
1060 assert(function != nullptr, "use clear_native_function to unregister natives");
1061 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1062 address* native_function = native_function_addr();
1063
1064 // We can see racers trying to place the same native function into place. Once
1065 // is plenty.
1066 address current = *native_function;
1067 if (current == function) return;
1068 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1069 function != nullptr) {
1070 // native_method_throw_unsatisfied_link_error_entry() should only
1071 // be passed when post_event_flag is false.
1072 assert(function !=
1073 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1074 "post_event_flag mismatch");
1075
1076 // post the bind event, and possible change the bind function
1077 JvmtiExport::post_native_method_bind(this, &function);
1078 }
1079 *native_function = function;
1080 // This function can be called more than once. We must make sure that we always
1081 // use the latest registered method -> check if a stub already has been generated.
1082 // If so, we have to make it not_entrant.
1083 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1084 if (nm != nullptr) {
1085 nm->make_not_entrant(nmethod::InvalidationReason::SET_NATIVE_FUNCTION);
1086 }
1087 }
1088
1089
1090 bool Method::has_native_function() const {
1091 if (is_special_native_intrinsic())
1092 return false; // special-cased in SharedRuntime::generate_native_wrapper
1093 address func = native_function();
1094 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1095 }
1096
1097
1098 void Method::clear_native_function() {
1099 // Note: is_method_handle_intrinsic() is allowed here.
1100 set_native_function(
1101 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1102 !native_bind_event_is_interesting);
1103 this->unlink_code();
1104 }
1105
1106
1107 void Method::set_signature_handler(address handler) {
1108 address* signature_handler = signature_handler_addr();
1109 *signature_handler = handler;
1110 }
1111
1112
1113 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1114 assert(reason != nullptr, "must provide a reason");
1115 if (PrintCompilation && report) {
1116 ttyLocker ttyl;
1117 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1118 if (comp_level == CompLevel_all) {
1119 tty->print("all levels ");
1120 } else {
1121 tty->print("level %d ", comp_level);
1122 }
1123 this->print_short_name(tty);
1124 int size = this->code_size();
1125 if (size > 0) {
1126 tty->print(" (%d bytes)", size);
1127 }
1128 if (reason != nullptr) {
1129 tty->print(" %s", reason);
1130 }
1131 tty->cr();
1132 }
1133 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1134 ttyLocker ttyl;
1135 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'",
1136 os::current_thread_id(), is_osr, comp_level);
1137 if (reason != nullptr) {
1138 xtty->print(" reason=\'%s\'", reason);
1139 }
1140 xtty->method(this);
1141 xtty->stamp();
1142 xtty->end_elem();
1143 }
1144 }
1145
1146 bool Method::is_always_compilable() const {
1147 // Generated adapters must be compiled
1148 if (is_special_native_intrinsic() && is_synthetic()) {
1149 assert(!is_not_c1_compilable(), "sanity check");
1150 assert(!is_not_c2_compilable(), "sanity check");
1151 return true;
1152 }
1153
1154 return false;
1155 }
1156
1157 bool Method::is_not_compilable(int comp_level) const {
1158 if (number_of_breakpoints() > 0)
1159 return true;
1160 if (is_always_compilable())
1161 return false;
1162 if (comp_level == CompLevel_any)
1163 return is_not_c1_compilable() && is_not_c2_compilable();
1164 if (is_c1_compile(comp_level))
1165 return is_not_c1_compilable();
1166 if (is_c2_compile(comp_level))
1167 return is_not_c2_compilable();
1168 return false;
1169 }
1170
1171 // call this when compiler finds that this method is not compilable
1172 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1173 if (is_always_compilable()) {
1174 // Don't mark a method which should be always compilable
1175 return;
1176 }
1177 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1178 if (comp_level == CompLevel_all) {
1179 set_is_not_c1_compilable();
1180 set_is_not_c2_compilable();
1181 } else {
1182 if (is_c1_compile(comp_level))
1183 set_is_not_c1_compilable();
1184 if (is_c2_compile(comp_level))
1185 set_is_not_c2_compilable();
1186 }
1187 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1188 }
1189
1190 bool Method::is_not_osr_compilable(int comp_level) const {
1191 if (is_not_compilable(comp_level))
1192 return true;
1193 if (comp_level == CompLevel_any)
1194 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1195 if (is_c1_compile(comp_level))
1196 return is_not_c1_osr_compilable();
1197 if (is_c2_compile(comp_level))
1198 return is_not_c2_osr_compilable();
1199 return false;
1200 }
1201
1202 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1203 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1204 if (comp_level == CompLevel_all) {
1205 set_is_not_c1_osr_compilable();
1206 set_is_not_c2_osr_compilable();
1207 } else {
1208 if (is_c1_compile(comp_level))
1209 set_is_not_c1_osr_compilable();
1210 if (is_c2_compile(comp_level))
1211 set_is_not_c2_osr_compilable();
1212 }
1213 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1214 }
1215
1216 // Revert to using the interpreter and clear out the nmethod
1217 void Method::clear_code() {
1218 // this may be null if c2i adapters have not been made yet
1219 // Only should happen at allocate time.
1220 if (adapter() == nullptr) {
1221 _from_compiled_entry = nullptr;
1222 _from_compiled_inline_entry = nullptr;
1223 _from_compiled_inline_ro_entry = nullptr;
1224 } else {
1225 _from_compiled_entry = adapter()->get_c2i_entry();
1226 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1227 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1228 }
1229 OrderAccess::storestore();
1230 _from_interpreted_entry = _i2i_entry;
1231 OrderAccess::storestore();
1232 _code = nullptr;
1233 }
1234
1235 void Method::unlink_code(nmethod *compare) {
1236 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1237 // We need to check if either the _code or _from_compiled_code_entry_point
1238 // refer to this nmethod because there is a race in setting these two fields
1239 // in Method* as seen in bugid 4947125.
1240 if (code() == compare ||
1241 from_compiled_entry() == compare->verified_entry_point()) {
1242 clear_code();
1243 }
1244 }
1245
1246 void Method::unlink_code() {
1247 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1248 clear_code();
1249 }
1250
1251 #if INCLUDE_CDS
1252 // Called by class data sharing to remove any entry points (which are not shared)
1253 void Method::unlink_method() {
1254 assert(CDSConfig::is_dumping_archive(), "sanity");
1255 _code = nullptr;
1256 if (!CDSConfig::is_dumping_adapters()) {
1257 _adapter = nullptr;
1258 }
1259 _i2i_entry = nullptr;
1260 _from_compiled_entry = nullptr;
1261 _from_compiled_inline_entry = nullptr;
1262 _from_compiled_inline_ro_entry = nullptr;
1263 _from_interpreted_entry = nullptr;
1264
1265 if (is_native()) {
1266 *native_function_addr() = nullptr;
1267 set_signature_handler(nullptr);
1268 }
1269 NOT_PRODUCT(set_compiled_invocation_count(0);)
1270
1271 clear_method_data();
1272 clear_method_counters();
1273 clear_is_not_c1_compilable();
1274 clear_is_not_c1_osr_compilable();
1275 clear_is_not_c2_compilable();
1276 clear_is_not_c2_osr_compilable();
1277 clear_queued_for_compilation();
1278
1279 remove_unshareable_flags();
1280 }
1281
1282 void Method::remove_unshareable_flags() {
1283 // clear all the flags that shouldn't be in the archived version
1284 assert(!is_old(), "must be");
1285 assert(!is_obsolete(), "must be");
1286 assert(!is_deleted(), "must be");
1287
1288 set_is_prefixed_native(false);
1289 set_queued_for_compilation(false);
1290 set_is_not_c2_compilable(false);
1291 set_is_not_c1_compilable(false);
1292 set_is_not_c2_osr_compilable(false);
1293 set_on_stack_flag(false);
1294 set_has_scalarized_args(false);
1295 set_has_scalarized_return(false);
1296 }
1297 #endif
1298
1299 // Called when the method_holder is getting linked. Setup entrypoints so the method
1300 // is ready to be called from interpreter, compiler, and vtables.
1301 void Method::link_method(const methodHandle& h_method, TRAPS) {
1302 if (log_is_enabled(Info, perf, class, link)) {
1303 ClassLoader::perf_ik_link_methods_count()->inc();
1304 }
1305
1306 // If the code cache is full, we may reenter this function for the
1307 // leftover methods that weren't linked.
1308 if (adapter() != nullptr) {
1309 if (adapter()->in_aot_cache()) {
1310 assert(adapter()->is_linked(), "Adapter is shared but not linked");
1311 } else {
1312 return;
1313 }
1314 }
1315 assert( _code == nullptr, "nothing compiled yet" );
1316
1317 // Setup interpreter entrypoint
1318 assert(this == h_method(), "wrong h_method()" );
1319
1320 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache");
1321 address entry = Interpreter::entry_for_method(h_method);
1322 assert(entry != nullptr, "interpreter entry must be non-null");
1323 // Sets both _i2i_entry and _from_interpreted_entry
1324 set_interpreter_entry(entry);
1325
1326 // Don't overwrite already registered native entries.
1327 if (is_native() && !has_native_function()) {
1328 set_native_function(
1329 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1330 !native_bind_event_is_interesting);
1331 }
1332 if (InlineTypeReturnedAsFields && returns_inline_type() && !has_scalarized_return()) {
1333 set_has_scalarized_return();
1334 }
1335
1336 // Setup compiler entrypoint. This is made eagerly, so we do not need
1337 // special handling of vtables. An alternative is to make adapters more
1338 // lazily by calling make_adapter() from from_compiled_entry() for the
1339 // normal calls. For vtable calls life gets more complicated. When a
1340 // call-site goes mega-morphic we need adapters in all methods which can be
1341 // called from the vtable. We need adapters on such methods that get loaded
1342 // later. Ditto for mega-morphic itable calls. If this proves to be a
1343 // problem we'll make these lazily later.
1344 if (is_abstract()) {
1345 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
1346 h_method->_from_compiled_entry = wrong_method_abstract;
1347 h_method->_from_compiled_inline_entry = wrong_method_abstract;
1348 h_method->_from_compiled_inline_ro_entry = wrong_method_abstract;
1349 } else if (_adapter == nullptr) {
1350 (void) make_adapters(h_method, CHECK);
1351 #ifndef ZERO
1352 assert(adapter()->is_linked(), "Adapter must have been linked");
1353 #endif
1354 h_method->_from_compiled_entry = adapter()->get_c2i_entry();
1355 h_method->_from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1356 h_method->_from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1357 }
1358
1359 // ONLY USE the h_method now as make_adapter may have blocked
1360
1361 if (h_method->is_continuation_native_intrinsic()) {
1362 _from_interpreted_entry = nullptr;
1363 _from_compiled_entry = nullptr;
1364 _i2i_entry = nullptr;
1365 if (Continuations::enabled()) {
1366 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1367 AdapterHandlerLibrary::create_native_wrapper(h_method);
1368 if (!h_method->has_compiled_code()) {
1369 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1370 }
1371 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1372 }
1373 }
1374 }
1375
1376 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1377 assert(!mh->is_abstract(), "abstract methods do not have adapters");
1378 PerfTraceTime timer(ClassLoader::perf_method_adapters_time());
1379
1380 // Adapters for compiled code are made eagerly here. They are fairly
1381 // small (generally < 100 bytes) and quick to make (and cached and shared)
1382 // so making them eagerly shouldn't be too expensive.
1383 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1384 if (adapter == nullptr ) {
1385 if (!is_init_completed()) {
1386 // Don't throw exceptions during VM initialization because java.lang.* classes
1387 // might not have been initialized, causing problems when constructing the
1388 // Java exception object.
1389 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1390 } else {
1391 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1392 }
1393 }
1394
1395 assert(!mh->has_scalarized_args() || adapter->get_sig_cc() != nullptr, "sigcc should not be null here");
1396
1397 mh->set_adapter_entry(adapter);
1398 return adapter->get_c2i_entry();
1399 }
1400
1401 // The verified_code_entry() must be called when a invoke is resolved
1402 // on this method.
1403
1404 // It returns the compiled code entry point, after asserting not null.
1405 // This function is called after potential safepoints so that nmethod
1406 // or adapter that it points to is still live and valid.
1407 // This function must not hit a safepoint!
1408 address Method::verified_code_entry() {
1409 DEBUG_ONLY(NoSafepointVerifier nsv;)
1410 assert(_from_compiled_entry != nullptr, "must be set");
1411 return _from_compiled_entry;
1412 }
1413
1414 address Method::verified_inline_code_entry() {
1415 DEBUG_ONLY(NoSafepointVerifier nsv;)
1416 assert(_from_compiled_inline_entry != nullptr, "must be set");
1417 return _from_compiled_inline_entry;
1418 }
1419
1420 address Method::verified_inline_ro_code_entry() {
1421 DEBUG_ONLY(NoSafepointVerifier nsv;)
1422 assert(_from_compiled_inline_ro_entry != nullptr, "must be set");
1423 return _from_compiled_inline_ro_entry;
1424 }
1425
1426 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1427 // (could be racing a deopt).
1428 // Not inline to avoid circular ref.
1429 bool Method::check_code() const {
1430 // cached in a register or local. There's a race on the value of the field.
1431 nmethod *code = AtomicAccess::load_acquire(&_code);
1432 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1433 }
1434
1435 // Install compiled code. Instantly it can execute.
1436 void Method::set_code(const methodHandle& mh, nmethod *code) {
1437 assert_lock_strong(NMethodState_lock);
1438 assert( code, "use clear_code to remove code" );
1439 assert( mh->check_code(), "" );
1440
1441 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1442
1443 // These writes must happen in this order, because the interpreter will
1444 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1445 // which jumps to _from_compiled_entry.
1446 mh->_code = code; // Assign before allowing compiled code to exec
1447
1448 int comp_level = code->comp_level();
1449 // In theory there could be a race here. In practice it is unlikely
1450 // and not worth worrying about.
1451 if (comp_level > mh->highest_comp_level()) {
1452 mh->set_highest_comp_level(comp_level);
1453 }
1454
1455 OrderAccess::storestore();
1456 mh->_from_compiled_entry = code->verified_entry_point();
1457 mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1458 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1459 OrderAccess::storestore();
1460
1461 if (mh->is_continuation_native_intrinsic()) {
1462 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1463
1464 if (mh->is_continuation_enter_intrinsic()) {
1465 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1466 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1467 } else if (mh->is_continuation_yield_intrinsic()) {
1468 mh->_i2i_entry = mh->get_i2c_entry();
1469 } else {
1470 guarantee(false, "Unknown Continuation native intrinsic");
1471 }
1472 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1473 AtomicAccess::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1474 } else if (!mh->is_method_handle_intrinsic()) {
1475 // Instantly compiled code can execute.
1476 mh->_from_interpreted_entry = mh->get_i2c_entry();
1477 }
1478 }
1479
1480
1481 bool Method::is_overridden_in(Klass* k) const {
1482 InstanceKlass* ik = InstanceKlass::cast(k);
1483
1484 if (ik->is_interface()) return false;
1485
1486 // If method is an interface, we skip it - except if it
1487 // is a miranda method
1488 if (method_holder()->is_interface()) {
1489 // Check that method is not a miranda method
1490 if (ik->lookup_method(name(), signature()) == nullptr) {
1491 // No implementation exist - so miranda method
1492 return false;
1493 }
1494 return true;
1495 }
1496
1497 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1498 if (!has_vtable_index()) {
1499 return false;
1500 } else {
1501 Method* vt_m = ik->method_at_vtable(vtable_index());
1502 return vt_m != this;
1503 }
1504 }
1505
1506
1507 // give advice about whether this Method* should be cached or not
1508 bool Method::should_not_be_cached() const {
1509 if (is_old()) {
1510 // This method has been redefined. It is either EMCP or obsolete
1511 // and we don't want to cache it because that would pin the method
1512 // down and prevent it from being collectible if and when it
1513 // finishes executing.
1514 return true;
1515 }
1516
1517 // caching this method should be just fine
1518 return false;
1519 }
1520
1521
1522 /**
1523 * Returns true if this is one of the specially treated methods for
1524 * security related stack walks (like Reflection.getCallerClass).
1525 */
1526 bool Method::is_ignored_by_security_stack_walk() const {
1527 if (intrinsic_id() == vmIntrinsics::_invoke) {
1528 // This is Method.invoke() -- ignore it
1529 return true;
1530 }
1531 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1532 // This is an auxiliary frame -- ignore it
1533 return true;
1534 }
1535 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1536 // This is an internal adapter frame for method handles -- ignore it
1537 return true;
1538 }
1539 return false;
1540 }
1541
1542
1543 // Constant pool structure for invoke methods:
1544 enum {
1545 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1546 _imcp_invoke_signature, // utf8: (variable Symbol*)
1547 _imcp_limit
1548 };
1549
1550 // Test if this method is an MH adapter frame generated by Java code.
1551 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1552 bool Method::is_compiled_lambda_form() const {
1553 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1554 }
1555
1556 // Test if this method is an internal MH primitive method.
1557 bool Method::is_method_handle_intrinsic() const {
1558 vmIntrinsics::ID iid = intrinsic_id();
1559 return (MethodHandles::is_signature_polymorphic(iid) &&
1560 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1561 }
1562
1563 bool Method::has_member_arg() const {
1564 vmIntrinsics::ID iid = intrinsic_id();
1565 return (MethodHandles::is_signature_polymorphic(iid) &&
1566 MethodHandles::has_member_arg(iid));
1567 }
1568
1569 // Make an instance of a signature-polymorphic internal MH primitive.
1570 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1571 Symbol* signature,
1572 TRAPS) {
1573 ResourceMark rm(THREAD);
1574 methodHandle empty;
1575
1576 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1577 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1578 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1579
1580 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1581
1582 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1583 name->increment_refcount();
1584 signature->increment_refcount();
1585
1586 int cp_length = _imcp_limit;
1587 ClassLoaderData* loader_data = holder->class_loader_data();
1588 constantPoolHandle cp;
1589 {
1590 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1591 cp = constantPoolHandle(THREAD, cp_oop);
1592 }
1593 cp->copy_fields(holder->constants());
1594 cp->set_pool_holder(holder);
1595 cp->symbol_at_put(_imcp_invoke_name, name);
1596 cp->symbol_at_put(_imcp_invoke_signature, signature);
1597 cp->set_has_preresolution();
1598 cp->set_is_for_method_handle_intrinsic();
1599
1600 // decide on access bits: public or not?
1601 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1602 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1603 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1604 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1605
1606 methodHandle m;
1607 {
1608 InlineTableSizes sizes;
1609 Method* m_oop = Method::allocate(loader_data, 0,
1610 accessFlags_from(flags_bits), &sizes,
1611 ConstMethod::NORMAL,
1612 name,
1613 CHECK_(empty));
1614 m = methodHandle(THREAD, m_oop);
1615 }
1616 m->set_constants(cp());
1617 m->set_name_index(_imcp_invoke_name);
1618 m->set_signature_index(_imcp_invoke_signature);
1619 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1620 assert(m->signature() == signature, "");
1621 m->constMethod()->compute_from_signature(signature, must_be_static);
1622 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1623 assert(m->is_method_handle_intrinsic(), "");
1624 #ifdef ASSERT
1625 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1626 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1627 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1628 #endif //ASSERT
1629
1630 // Finally, set up its entry points.
1631 assert(m->can_be_statically_bound(), "");
1632 m->set_vtable_index(Method::nonvirtual_vtable_index);
1633 m->link_method(m, CHECK_(empty));
1634
1635 if (iid == vmIntrinsics::_linkToNative) {
1636 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1637 }
1638 if (log_is_enabled(Debug, methodhandles)) {
1639 LogTarget(Debug, methodhandles) lt;
1640 LogStream ls(lt);
1641 m->print_on(&ls);
1642 }
1643
1644 return m;
1645 }
1646
1647 #if INCLUDE_CDS
1648 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1649 if (m->adapter() != nullptr) {
1650 m->set_from_compiled_entry(m->adapter()->get_c2i_entry());
1651 m->set_from_compiled_inline_entry(m->adapter()->get_c2i_inline_entry());
1652 m->set_from_compiled_inline_ro_entry(m->adapter()->get_c2i_inline_ro_entry());
1653 }
1654 m->link_method(m, CHECK);
1655
1656 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1657 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1658 }
1659 }
1660 #endif
1661
1662 Klass* Method::check_non_bcp_klass(Klass* klass) {
1663 if (klass != nullptr && klass->class_loader() != nullptr) {
1664 if (klass->is_objArray_klass())
1665 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1666 return klass;
1667 }
1668 return nullptr;
1669 }
1670
1671
1672 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1673 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1674 // Code below does not work for native methods - they should never get rewritten anyway
1675 assert(!m->is_native(), "cannot rewrite native methods");
1676 // Allocate new Method*
1677 AccessFlags flags = m->access_flags();
1678
1679 ConstMethod* cm = m->constMethod();
1680 int checked_exceptions_len = cm->checked_exceptions_length();
1681 int localvariable_len = cm->localvariable_table_length();
1682 int exception_table_len = cm->exception_table_length();
1683 int method_parameters_len = cm->method_parameters_length();
1684 int method_annotations_len = cm->method_annotations_length();
1685 int parameter_annotations_len = cm->parameter_annotations_length();
1686 int type_annotations_len = cm->type_annotations_length();
1687 int default_annotations_len = cm->default_annotations_length();
1688
1689 InlineTableSizes sizes(
1690 localvariable_len,
1691 new_compressed_linenumber_size,
1692 exception_table_len,
1693 checked_exceptions_len,
1694 method_parameters_len,
1695 cm->generic_signature_index(),
1696 method_annotations_len,
1697 parameter_annotations_len,
1698 type_annotations_len,
1699 default_annotations_len,
1700 0);
1701
1702 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1703 Method* newm_oop = Method::allocate(loader_data,
1704 new_code_length,
1705 flags,
1706 &sizes,
1707 m->method_type(),
1708 m->name(),
1709 CHECK_(methodHandle()));
1710 methodHandle newm (THREAD, newm_oop);
1711
1712 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1713 ConstMethod* newcm = newm->constMethod();
1714 int new_const_method_size = newm->constMethod()->size();
1715
1716 // This works because the source and target are both Methods. Some compilers
1717 // (e.g., clang) complain that the target vtable pointer will be stomped,
1718 // so cast away newm()'s and m()'s Methodness.
1719 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1720
1721 // Create shallow copy of ConstMethod.
1722 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1723
1724 // Reset correct method/const method, method size, and parameter info
1725 newm->set_constMethod(newcm);
1726 newm->constMethod()->set_code_size(new_code_length);
1727 newm->constMethod()->set_constMethod_size(new_const_method_size);
1728 assert(newm->code_size() == new_code_length, "check");
1729 assert(newm->method_parameters_length() == method_parameters_len, "check");
1730 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1731 assert(newm->exception_table_length() == exception_table_len, "check");
1732 assert(newm->localvariable_table_length() == localvariable_len, "check");
1733 // Copy new byte codes
1734 memcpy(newm->code_base(), new_code, new_code_length);
1735 // Copy line number table
1736 if (new_compressed_linenumber_size > 0) {
1737 memcpy(newm->compressed_linenumber_table(),
1738 new_compressed_linenumber_table,
1739 new_compressed_linenumber_size);
1740 }
1741 // Copy method_parameters
1742 if (method_parameters_len > 0) {
1743 memcpy(newm->method_parameters_start(),
1744 m->method_parameters_start(),
1745 method_parameters_len * sizeof(MethodParametersElement));
1746 }
1747 // Copy checked_exceptions
1748 if (checked_exceptions_len > 0) {
1749 memcpy(newm->checked_exceptions_start(),
1750 m->checked_exceptions_start(),
1751 checked_exceptions_len * sizeof(CheckedExceptionElement));
1752 }
1753 // Copy exception table
1754 if (exception_table_len > 0) {
1755 memcpy(newm->exception_table_start(),
1756 m->exception_table_start(),
1757 exception_table_len * sizeof(ExceptionTableElement));
1758 }
1759 // Copy local variable number table
1760 if (localvariable_len > 0) {
1761 memcpy(newm->localvariable_table_start(),
1762 m->localvariable_table_start(),
1763 localvariable_len * sizeof(LocalVariableTableElement));
1764 }
1765 // Copy stackmap table
1766 if (m->has_stackmap_table()) {
1767 int code_attribute_length = m->stackmap_data()->length();
1768 Array<u1>* stackmap_data =
1769 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1770 memcpy((void*)stackmap_data->adr_at(0),
1771 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1772 newm->set_stackmap_data(stackmap_data);
1773 }
1774
1775 // copy annotations over to new method
1776 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1777 return newm;
1778 }
1779
1780 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1781 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1782 // because we are not loading from core libraries
1783 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1784 // which does not use the class default class loader so we check for its loader here
1785 const InstanceKlass* ik = InstanceKlass::cast(holder);
1786 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1787 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1788 }
1789
1790 // see if the klass name is well-known:
1791 Symbol* klass_name = ik->name();
1792 vmSymbolID id = vmSymbols::find_sid(klass_name);
1793 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1794 return id;
1795 } else {
1796 return vmSymbolID::NO_SID;
1797 }
1798 }
1799
1800 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1801 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1802 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1803 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1804 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1805
1806 // the klass name is well-known:
1807 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1808 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1809
1810 // ditto for method and signature:
1811 vmSymbolID name_id = vmSymbols::find_sid(name());
1812 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1813 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1814 && name_id == vmSymbolID::NO_SID) {
1815 return;
1816 }
1817 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1818 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1819 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1820 && sig_id == vmSymbolID::NO_SID) {
1821 return;
1822 }
1823
1824 u2 flags = access_flags().as_method_flags();
1825 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1826 if (id != vmIntrinsics::_none) {
1827 set_intrinsic_id(id);
1828 if (id == vmIntrinsics::_Class_cast) {
1829 // Even if the intrinsic is rejected, we want to inline this simple method.
1830 set_force_inline();
1831 }
1832 return;
1833 }
1834
1835 // A few slightly irregular cases:
1836 switch (klass_id) {
1837 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1838 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1839 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1840 if (!is_native()) break;
1841 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1842 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1843 id = vmIntrinsics::_none;
1844 break;
1845
1846 default:
1847 break;
1848 }
1849
1850 if (id != vmIntrinsics::_none) {
1851 // Set up its iid. It is an alias method.
1852 set_intrinsic_id(id);
1853 return;
1854 }
1855 }
1856
1857 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1858 if (!THREAD->can_call_java()) {
1859 // There is nothing useful this routine can do from within the Compile thread.
1860 // Hopefully, the signature contains only well-known classes.
1861 // We could scan for this and return true/false, but the caller won't care.
1862 return false;
1863 }
1864 bool sig_is_loaded = true;
1865 ResourceMark rm(THREAD);
1866 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1867 if (ss.is_reference()) {
1868 // load everything, including arrays "[Lfoo;"
1869 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1870 // We are loading classes eagerly. If a ClassNotFoundException or
1871 // a LinkageError was generated, be sure to ignore it.
1872 if (HAS_PENDING_EXCEPTION) {
1873 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1874 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1875 CLEAR_PENDING_EXCEPTION;
1876 } else {
1877 return false;
1878 }
1879 }
1880 if( klass == nullptr) { sig_is_loaded = false; }
1881 }
1882 }
1883 return sig_is_loaded;
1884 }
1885
1886 // Exposed so field engineers can debug VM
1887 void Method::print_short_name(outputStream* st) const {
1888 ResourceMark rm;
1889 #ifdef PRODUCT
1890 st->print(" %s::", method_holder()->external_name());
1891 #else
1892 st->print(" %s::", method_holder()->internal_name());
1893 #endif
1894 name()->print_symbol_on(st);
1895 if (WizardMode) signature()->print_symbol_on(st);
1896 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1897 MethodHandles::print_as_basic_type_signature_on(st, signature());
1898 }
1899
1900 // Comparer for sorting an object array containing
1901 // Method*s.
1902 static int method_comparator(Method* a, Method* b) {
1903 return a->name()->fast_compare(b->name());
1904 }
1905
1906 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1907 // default_methods also uses this without the ordering for fast find_method
1908 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1909 int length = methods->length();
1910 if (length > 1) {
1911 if (func == nullptr) {
1912 func = method_comparator;
1913 }
1914 {
1915 NoSafepointVerifier nsv;
1916 QuickSort::sort(methods->data(), length, func);
1917 }
1918 // Reset method ordering
1919 if (set_idnums) {
1920 for (u2 i = 0; i < length; i++) {
1921 Method* m = methods->at(i);
1922 m->set_method_idnum(i);
1923 m->set_orig_method_idnum(i);
1924 }
1925 }
1926 }
1927 }
1928
1929 //-----------------------------------------------------------------------------------
1930 // Non-product code unless JVM/TI needs it
1931
1932 #if !defined(PRODUCT) || INCLUDE_JVMTI
1933 class SignatureTypePrinter : public SignatureTypeNames {
1934 private:
1935 outputStream* _st;
1936 bool _use_separator;
1937
1938 void type_name(const char* name) {
1939 if (_use_separator) _st->print(", ");
1940 _st->print("%s", name);
1941 _use_separator = true;
1942 }
1943
1944 public:
1945 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1946 _st = st;
1947 _use_separator = false;
1948 }
1949
1950 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1951 void print_returntype() { _use_separator = false; do_type(return_type()); }
1952 };
1953
1954
1955 void Method::print_name(outputStream* st) const {
1956 Thread *thread = Thread::current();
1957 ResourceMark rm(thread);
1958 st->print("%s ", is_static() ? "static" : "virtual");
1959 if (WizardMode) {
1960 st->print("%s.", method_holder()->internal_name());
1961 name()->print_symbol_on(st);
1962 signature()->print_symbol_on(st);
1963 } else {
1964 SignatureTypePrinter sig(signature(), st);
1965 sig.print_returntype();
1966 st->print(" %s.", method_holder()->internal_name());
1967 name()->print_symbol_on(st);
1968 st->print("(");
1969 sig.print_parameters();
1970 st->print(")");
1971 }
1972 }
1973 #endif // !PRODUCT || INCLUDE_JVMTI
1974
1975
1976 void Method::print_codes_on(outputStream* st, int flags, bool buffered) const {
1977 print_codes_on(0, code_size(), st, flags, buffered);
1978 }
1979
1980 void Method::print_codes_on(int from, int to, outputStream* st, int flags, bool buffered) const {
1981 Thread *thread = Thread::current();
1982 ResourceMark rm(thread);
1983 methodHandle mh (thread, (Method*)this);
1984 BytecodeTracer::print_method_codes(mh, from, to, st, flags, buffered);
1985 }
1986
1987 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1988 _bci = 0;
1989 _line = 0;
1990 };
1991
1992 bool CompressedLineNumberReadStream::read_pair() {
1993 jubyte next = read_byte();
1994 // Check for terminator
1995 if (next == 0) return false;
1996 if (next == 0xFF) {
1997 // Escape character, regular compression used
1998 _bci += read_signed_int();
1999 _line += read_signed_int();
2000 } else {
2001 // Single byte compression used
2002 _bci += next >> 3;
2003 _line += next & 0x7;
2004 }
2005 return true;
2006 }
2007
2008 #if INCLUDE_JVMTI
2009
2010 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
2011 BreakpointInfo* bp = method_holder()->breakpoints();
2012 for (; bp != nullptr; bp = bp->next()) {
2013 if (bp->match(this, bci)) {
2014 return bp->orig_bytecode();
2015 }
2016 }
2017 {
2018 ResourceMark rm;
2019 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
2020 }
2021 return Bytecodes::_shouldnotreachhere;
2022 }
2023
2024 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
2025 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
2026 BreakpointInfo* bp = method_holder()->breakpoints();
2027 for (; bp != nullptr; bp = bp->next()) {
2028 if (bp->match(this, bci)) {
2029 bp->set_orig_bytecode(code);
2030 // and continue, in case there is more than one
2031 }
2032 }
2033 }
2034
2035 void Method::set_breakpoint(int bci) {
2036 InstanceKlass* ik = method_holder();
2037 BreakpointInfo *bp = new BreakpointInfo(this, bci);
2038 bp->set_next(ik->breakpoints());
2039 ik->set_breakpoints(bp);
2040 // do this last:
2041 bp->set(this);
2042 }
2043
2044 static void clear_matches(Method* m, int bci) {
2045 InstanceKlass* ik = m->method_holder();
2046 BreakpointInfo* prev_bp = nullptr;
2047 BreakpointInfo* next_bp;
2048 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
2049 next_bp = bp->next();
2050 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
2051 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
2052 // do this first:
2053 bp->clear(m);
2054 // unhook it
2055 if (prev_bp != nullptr)
2056 prev_bp->set_next(next_bp);
2057 else
2058 ik->set_breakpoints(next_bp);
2059 delete bp;
2060 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
2061 // at same location. So we have multiple matching (method_index and bci)
2062 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
2063 // breakpoint for clear_breakpoint request and keep all other method versions
2064 // BreakpointInfo for future clear_breakpoint request.
2065 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
2066 // which is being called when class is unloaded. We delete all the Breakpoint
2067 // information for all versions of method. We may not correctly restore the original
2068 // bytecode in all method versions, but that is ok. Because the class is being unloaded
2069 // so these methods won't be used anymore.
2070 if (bci >= 0) {
2071 break;
2072 }
2073 } else {
2074 // This one is a keeper.
2075 prev_bp = bp;
2076 }
2077 }
2078 }
2079
2080 void Method::clear_breakpoint(int bci) {
2081 assert(bci >= 0, "");
2082 clear_matches(this, bci);
2083 }
2084
2085 void Method::clear_all_breakpoints() {
2086 clear_matches(this, -1);
2087 }
2088
2089 #endif // INCLUDE_JVMTI
2090
2091 int Method::highest_osr_comp_level() const {
2092 const MethodCounters* mcs = method_counters();
2093 if (mcs != nullptr) {
2094 return mcs->highest_osr_comp_level();
2095 } else {
2096 return CompLevel_none;
2097 }
2098 }
2099
2100 void Method::set_highest_comp_level(int level) {
2101 MethodCounters* mcs = method_counters();
2102 if (mcs != nullptr) {
2103 mcs->set_highest_comp_level(level);
2104 }
2105 }
2106
2107 void Method::set_highest_osr_comp_level(int level) {
2108 MethodCounters* mcs = method_counters();
2109 if (mcs != nullptr) {
2110 mcs->set_highest_osr_comp_level(level);
2111 }
2112 }
2113
2114 #if INCLUDE_JVMTI
2115
2116 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2117 _bci = bci;
2118 _name_index = m->name_index();
2119 _signature_index = m->signature_index();
2120 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2121 if (_orig_bytecode == Bytecodes::_breakpoint)
2122 _orig_bytecode = m->orig_bytecode_at(_bci);
2123 _next = nullptr;
2124 }
2125
2126 void BreakpointInfo::set(Method* method) {
2127 #ifdef ASSERT
2128 {
2129 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2130 if (code == Bytecodes::_breakpoint)
2131 code = method->orig_bytecode_at(_bci);
2132 assert(orig_bytecode() == code, "original bytecode must be the same");
2133 }
2134 #endif
2135 Thread *thread = Thread::current();
2136 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2137 method->incr_number_of_breakpoints(thread);
2138 {
2139 // Deoptimize all dependents on this method
2140 HandleMark hm(thread);
2141 methodHandle mh(thread, method);
2142 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2143 }
2144 }
2145
2146 void BreakpointInfo::clear(Method* method) {
2147 *method->bcp_from(_bci) = orig_bytecode();
2148 assert(method->number_of_breakpoints() > 0, "must not go negative");
2149 method->decr_number_of_breakpoints(Thread::current());
2150 }
2151
2152 #endif // INCLUDE_JVMTI
2153
2154 // jmethodID handling
2155 // jmethodIDs are 64-bit integers that will never run out and are mapped in a table
2156 // to their Method and vice versa. If JNI code has access to stale jmethodID, this
2157 // wastes no memory but the Method* returned is null.
2158
2159 // Add a method id to the jmethod_ids
2160 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2161 // Have to add jmethod_ids() to class loader data thread-safely.
2162 // Also have to add the method to the InstanceKlass list safely, which the lock
2163 // protects as well.
2164 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2165 jmethodID jmid = JmethodIDTable::make_jmethod_id(m);
2166 assert(jmid != nullptr, "must be created");
2167
2168 // Add to growable array in CLD.
2169 cld->add_jmethod_id(jmid);
2170 return jmid;
2171 }
2172
2173 // This looks in the InstanceKlass cache, then calls back to make_jmethod_id if not found.
2174 jmethodID Method::jmethod_id() {
2175 return method_holder()->get_jmethod_id(this);
2176 }
2177
2178 // Get the Method out of the table given the method id.
2179 Method* Method::resolve_jmethod_id(jmethodID mid) {
2180 assert(mid != nullptr, "JNI method id should not be null");
2181 return JmethodIDTable::resolve_jmethod_id(mid);
2182 }
2183
2184 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2185 // Can't assert the method_holder is the same because the new method has the
2186 // scratch method holder.
2187 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2188 == new_method->method_holder()->class_loader() ||
2189 new_method->method_holder()->class_loader() == nullptr, // allow substitution to Unsafe method
2190 "changing to a different class loader");
2191 JmethodIDTable::change_method_associated_with_jmethod_id(jmid, new_method);
2192 }
2193
2194 // If there's a jmethodID for this method, clear the Method
2195 // but leave jmethodID for this method in the table.
2196 // It's deallocated with class unloading.
2197 void Method::clear_jmethod_id() {
2198 jmethodID mid = method_holder()->jmethod_id_or_null(this);
2199 if (mid != nullptr) {
2200 JmethodIDTable::clear_jmethod_id(mid, this);
2201 }
2202 }
2203
2204 bool Method::validate_jmethod_id(jmethodID mid) {
2205 Method* m = resolve_jmethod_id(mid);
2206 assert(m != nullptr, "should be called with non-null method");
2207 InstanceKlass* ik = m->method_holder();
2208 ClassLoaderData* cld = ik->class_loader_data();
2209 if (cld->jmethod_ids() == nullptr) return false;
2210 return (cld->jmethod_ids()->contains(mid));
2211 }
2212
2213 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2214 if (mid == nullptr) return nullptr;
2215 Method* o = resolve_jmethod_id(mid);
2216 if (o == nullptr) {
2217 return nullptr;
2218 }
2219 // Method should otherwise be valid. Assert for testing.
2220 assert(is_valid_method(o), "should be valid jmethodid");
2221 // If the method's class holder object is unreferenced, but not yet marked as
2222 // unloaded, we need to return null here too because after a safepoint, its memory
2223 // will be reclaimed.
2224 return o->method_holder()->is_loader_alive() ? o : nullptr;
2225 }
2226
2227 void Method::set_on_stack(const bool value) {
2228 // Set both the method itself and its constant pool. The constant pool
2229 // on stack means some method referring to it is also on the stack.
2230 constants()->set_on_stack(value);
2231
2232 bool already_set = on_stack_flag();
2233 set_on_stack_flag(value);
2234 if (value && !already_set) {
2235 MetadataOnStackMark::record(this);
2236 }
2237 }
2238
2239 void Method::record_gc_epoch() {
2240 // If any method is on the stack in continuations, none of them can be reclaimed,
2241 // so save the marking cycle to check for the whole class in the cpCache.
2242 // The cpCache is writeable.
2243 constants()->cache()->record_gc_epoch();
2244 }
2245
2246 bool Method::has_method_vptr(const void* ptr) {
2247 Method m;
2248 // This assumes that the vtbl pointer is the first word of a C++ object.
2249 return dereference_vptr(&m) == dereference_vptr(ptr);
2250 }
2251
2252 // Check that this pointer is valid by checking that the vtbl pointer matches
2253 bool Method::is_valid_method(const Method* m) {
2254 if (m == nullptr) {
2255 return false;
2256 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2257 // Quick sanity check on pointer.
2258 return false;
2259 } else if (!os::is_readable_range(m, m + 1)) {
2260 return false;
2261 } else if (m->in_aot_cache()) {
2262 return CppVtables::is_valid_shared_method(m);
2263 } else if (Metaspace::contains_non_shared(m)) {
2264 return has_method_vptr((const void*)m);
2265 } else {
2266 return false;
2267 }
2268 }
2269
2270 bool Method::is_scalarized_arg(int idx) const {
2271 if (!has_scalarized_args()) {
2272 return false;
2273 }
2274 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID
2275 int depth = 0;
2276 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2277 for (int i = 0; i < sig->length(); i++) {
2278 BasicType bt = sig->at(i)._bt;
2279 if (bt == T_METADATA) {
2280 depth++;
2281 }
2282 if (idx == 0) {
2283 break; // Argument found
2284 }
2285 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2286 depth--;
2287 }
2288 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2289 idx--; // Advance to next argument
2290 }
2291 }
2292 return depth != 0;
2293 }
2294
2295 // Printing
2296
2297 #ifndef PRODUCT
2298
2299 void Method::print_on(outputStream* st) const {
2300 ResourceMark rm;
2301 assert(is_method(), "must be method");
2302 st->print_cr("%s", internal_name());
2303 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2304 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2305 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2306 constants()->print_value_on(st); st->cr();
2307 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr();
2308 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2309 st->print (" - name: "); name()->print_value_on(st); st->cr();
2310 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2311 st->print_cr(" - max stack: %d", max_stack());
2312 st->print_cr(" - max locals: %d", max_locals());
2313 st->print_cr(" - size of params: %d", size_of_parameters());
2314 st->print_cr(" - method size: %d", method_size());
2315 if (intrinsic_id() != vmIntrinsics::_none)
2316 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2317 if (highest_comp_level() != CompLevel_none)
2318 st->print_cr(" - highest level: %d", highest_comp_level());
2319 st->print_cr(" - vtable index: %d", _vtable_index);
2320 #ifdef ASSERT
2321 if (valid_itable_index())
2322 st->print_cr(" - itable index: %d", itable_index());
2323 #endif
2324 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2325 st->print( " - adapters: ");
2326 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2327 if (a == nullptr)
2328 st->print_cr(PTR_FORMAT, p2i(a));
2329 else
2330 a->print_adapter_on(st);
2331 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2332 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2333 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry()));
2334 st->print_cr(" - code size: %d", code_size());
2335 if (code_size() != 0) {
2336 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2337 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2338 }
2339 if (method_data() != nullptr) {
2340 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2341 }
2342 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2343 if (checked_exceptions_length() > 0) {
2344 CheckedExceptionElement* table = checked_exceptions_start();
2345 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2346 if (Verbose) {
2347 for (int i = 0; i < checked_exceptions_length(); i++) {
2348 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2349 }
2350 }
2351 }
2352 if (has_linenumber_table()) {
2353 u_char* table = compressed_linenumber_table();
2354 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2355 if (Verbose) {
2356 CompressedLineNumberReadStream stream(table);
2357 while (stream.read_pair()) {
2358 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2359 }
2360 }
2361 }
2362 st->print_cr(" - localvar length: %d", localvariable_table_length());
2363 if (localvariable_table_length() > 0) {
2364 LocalVariableTableElement* table = localvariable_table_start();
2365 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2366 if (Verbose) {
2367 for (int i = 0; i < localvariable_table_length(); i++) {
2368 int bci = table[i].start_bci;
2369 int len = table[i].length;
2370 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2371 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2372 int slot = table[i].slot;
2373 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2374 }
2375 }
2376 }
2377 if (code() != nullptr) {
2378 st->print (" - compiled code: ");
2379 code()->print_value_on(st);
2380 }
2381 if (is_native()) {
2382 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2383 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2384 }
2385 }
2386
2387 void Method::print_linkage_flags(outputStream* st) {
2388 access_flags().print_on(st);
2389 if (is_default_method()) {
2390 st->print("default ");
2391 }
2392 if (is_overpass()) {
2393 st->print("overpass ");
2394 }
2395 }
2396 #endif //PRODUCT
2397
2398 void Method::print_value_on(outputStream* st) const {
2399 assert(is_method(), "must be method");
2400 st->print("%s", internal_name());
2401 print_address_on(st);
2402 st->print(" ");
2403 if (WizardMode) access_flags().print_on(st);
2404 name()->print_value_on(st);
2405 st->print(" ");
2406 signature()->print_value_on(st);
2407 st->print(" in ");
2408 method_holder()->print_value_on(st);
2409 if (WizardMode) st->print("#%d", _vtable_index);
2410 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2411 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2412 }
2413
2414 // Verification
2415
2416 void Method::verify_on(outputStream* st) {
2417 guarantee(is_method(), "object must be method");
2418 guarantee(constants()->is_constantPool(), "should be constant pool");
2419 MethodData* md = method_data();
2420 guarantee(md == nullptr ||
2421 md->is_methodData(), "should be method data");
2422 }