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/cdsConfig.hpp"
26 #include "cds/cppVtables.hpp"
27 #include "cds/metaspaceShared.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/bytecodeStream.hpp"
40 #include "interpreter/bytecodeTracer.hpp"
41 #include "interpreter/bytecodes.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/constMethod.hpp"
55 #include "oops/constantPool.hpp"
56 #include "oops/klass.inline.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/methodData.hpp"
59 #include "oops/objArrayKlass.hpp"
60 #include "oops/objArrayOop.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/symbol.hpp"
63 #include "oops/trainingData.hpp"
64 #include "prims/jvmtiExport.hpp"
65 #include "prims/methodHandles.hpp"
66 #include "runtime/atomic.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/continuationEntry.hpp"
69 #include "runtime/frame.inline.hpp"
70 #include "runtime/handles.inline.hpp"
71 #include "runtime/init.hpp"
72 #include "runtime/java.hpp"
73 #include "runtime/orderAccess.hpp"
74 #include "runtime/perfData.hpp"
75 #include "runtime/relocator.hpp"
76 #include "runtime/safepointVerifiers.hpp"
77 #include "runtime/sharedRuntime.hpp"
78 #include "runtime/signature.hpp"
79 #include "runtime/threads.hpp"
80 #include "runtime/vm_version.hpp"
81 #include "utilities/align.hpp"
82 #include "utilities/quickSort.hpp"
83 #include "utilities/vmError.hpp"
84 #include "utilities/xmlstream.hpp"
85
86 // Implementation of Method
87
88 Method* Method::allocate(ClassLoaderData* loader_data,
89 int byte_code_size,
90 AccessFlags access_flags,
91 InlineTableSizes* sizes,
92 ConstMethod::MethodType method_type,
93 Symbol* name,
94 TRAPS) {
95 assert(!access_flags.is_native() || byte_code_size == 0,
96 "native methods should not contain byte codes");
97 ConstMethod* cm = ConstMethod::allocate(loader_data,
98 byte_code_size,
99 sizes,
100 method_type,
101 CHECK_NULL);
102 int size = Method::size(access_flags.is_native());
103 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
104 }
105
106 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
107 NoSafepointVerifier no_safepoint;
108 set_constMethod(xconst);
109 set_access_flags(access_flags);
110 set_intrinsic_id(vmIntrinsics::_none);
111 clear_method_data();
112 clear_method_counters();
113 set_vtable_index(Method::garbage_vtable_index);
114
115 // Fix and bury in Method*
116 set_interpreter_entry(nullptr); // sets i2i entry and from_int
117 set_adapter_entry(nullptr);
118 Method::clear_code(); // from_c/from_i get set to c2i/i2i
119
120 if (access_flags.is_native()) {
121 clear_native_function();
122 set_signature_handler(nullptr);
123 }
124
125 NOT_PRODUCT(set_compiled_invocation_count(0);)
126 // Name is very useful for debugging.
127 NOT_PRODUCT(_name = name;)
128 }
129
130 // Release Method*. The nmethod will be gone when we get here because
131 // we've walked the code cache.
132 void Method::deallocate_contents(ClassLoaderData* loader_data) {
133 MetadataFactory::free_metadata(loader_data, constMethod());
134 set_constMethod(nullptr);
135 MetadataFactory::free_metadata(loader_data, method_data());
136 clear_method_data();
137 MetadataFactory::free_metadata(loader_data, method_counters());
138 clear_method_counters();
139 set_adapter_entry(nullptr);
140 // The nmethod will be gone when we get here.
141 if (code() != nullptr) _code = nullptr;
142 }
143
144 void Method::release_C_heap_structures() {
145 if (method_data()) {
146 method_data()->release_C_heap_structures();
147
148 // Destroy MethodData embedded lock
149 method_data()->~MethodData();
150 }
151 }
152
153 address Method::get_i2c_entry() {
154 assert(adapter() != nullptr, "must have");
155 return adapter()->get_i2c_entry();
156 }
157
158 address Method::get_c2i_entry() {
159 assert(adapter() != nullptr, "must have");
160 return adapter()->get_c2i_entry();
161 }
162
163 address Method::get_c2i_unverified_entry() {
164 assert(adapter() != nullptr, "must have");
165 return adapter()->get_c2i_unverified_entry();
166 }
167
168 address Method::get_c2i_no_clinit_check_entry() {
169 assert(VM_Version::supports_fast_class_init_checks(), "");
170 assert(adapter() != nullptr, "must have");
171 return adapter()->get_c2i_no_clinit_check_entry();
172 }
173
174 char* Method::name_and_sig_as_C_string() const {
175 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
176 }
177
178 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
179 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
180 }
181
182 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
183 const char* klass_name = klass->external_name();
184 int klass_name_len = (int)strlen(klass_name);
185 int method_name_len = method_name->utf8_length();
186 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
187 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
188 strcpy(dest, klass_name);
189 dest[klass_name_len] = '.';
190 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
191 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
192 dest[len] = 0;
193 return dest;
194 }
195
196 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
197 Symbol* klass_name = klass->name();
198 klass_name->as_klass_external_name(buf, size);
199 int len = (int)strlen(buf);
200
201 if (len < size - 1) {
202 buf[len++] = '.';
203
204 method_name->as_C_string(&(buf[len]), size - len);
205 len = (int)strlen(buf);
206
207 signature->as_C_string(&(buf[len]), size - len);
208 }
209
210 return buf;
211 }
212
213 const char* Method::external_name() const {
214 return external_name(constants()->pool_holder(), name(), signature());
215 }
216
217 void Method::print_external_name(outputStream *os) const {
218 print_external_name(os, constants()->pool_holder(), name(), signature());
219 }
220
221 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
222 stringStream ss;
223 print_external_name(&ss, klass, method_name, signature);
224 return ss.as_string();
225 }
226
227 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
228 signature->print_as_signature_external_return_type(os);
229 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
230 signature->print_as_signature_external_parameters(os);
231 os->print(")");
232 }
233
234 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
235 if (log_is_enabled(Debug, exceptions)) {
236 ResourceMark rm(THREAD);
237 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
238 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
239 }
240 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
241 // access exception table
242 ExceptionTable table(mh());
243 int length = table.length();
244 // iterate through all entries sequentially
245 constantPoolHandle pool(THREAD, mh->constants());
246 for (int i = 0; i < length; i ++) {
247 //reacquire the table in case a GC happened
248 ExceptionTable table(mh());
249 int beg_bci = table.start_pc(i);
250 int end_bci = table.end_pc(i);
251 assert(beg_bci <= end_bci, "inconsistent exception table");
252 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
253 beg_bci, end_bci);
254
255 if (beg_bci <= throw_bci && throw_bci < end_bci) {
256 // exception handler bci range covers throw_bci => investigate further
257 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
258
259 int handler_bci = table.handler_pc(i);
260 int klass_index = table.catch_type_index(i);
261 if (klass_index == 0) {
262 if (log_is_enabled(Info, exceptions)) {
263 ResourceMark rm(THREAD);
264 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
265 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
266 }
267 return handler_bci;
268 } else if (ex_klass == nullptr) {
269 // Is this even possible?
270 if (log_is_enabled(Info, exceptions)) {
271 ResourceMark rm(THREAD);
272 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
273 mh()->name()->as_C_string(), handler_bci);
274 }
275 return handler_bci;
276 } else {
277 if (log_is_enabled(Debug, exceptions)) {
278 ResourceMark rm(THREAD);
279 log_debug(exceptions)(" - resolving catch type \"%s\"",
280 pool->klass_name_at(klass_index)->as_C_string());
281 }
282 // we know the exception class => get the constraint class
283 // this may require loading of the constraint class; if verification
284 // fails or some other exception occurs, return handler_bci
285 Klass* k = pool->klass_at(klass_index, THREAD);
286 if (HAS_PENDING_EXCEPTION) {
287 if (log_is_enabled(Debug, exceptions)) {
288 ResourceMark rm(THREAD);
289 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
290 PENDING_EXCEPTION->klass()->external_name());
291 }
292 return handler_bci;
293 }
294 assert(k != nullptr, "klass not loaded");
295 if (ex_klass->is_subtype_of(k)) {
296 if (log_is_enabled(Info, exceptions)) {
297 ResourceMark rm(THREAD);
298 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
299 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
300 }
301 return handler_bci;
302 }
303 }
304 }
305 }
306
307 if (log_is_enabled(Debug, exceptions)) {
308 ResourceMark rm(THREAD);
309 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
310 ex_klass->external_name(), mh->name()->as_C_string());
311 }
312
313 return -1;
314 }
315
316 void Method::mask_for(int bci, InterpreterOopMap* mask) {
317 methodHandle h_this(Thread::current(), this);
318 mask_for(h_this, bci, mask);
319 }
320
321 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
322 assert(this_mh() == this, "Sanity");
323 method_holder()->mask_for(this_mh, bci, mask);
324 }
325
326 int Method::bci_from(address bcp) const {
327 if (is_native() && bcp == nullptr) {
328 return 0;
329 }
330 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
331 // may call this after interrupting a nested ResourceMark.
332 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
333 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
334
335 return int(bcp - code_base());
336 }
337
338
339 int Method::validate_bci(int bci) const {
340 // Called from the verifier, and should return -1 if not valid.
341 return ((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size())) ? bci : -1;
342 }
343
344 // Return bci if it appears to be a valid bcp
345 // Return -1 otherwise.
346 // Used by profiling code, when invalid data is a possibility.
347 // The caller is responsible for validating the Method* itself.
348 int Method::validate_bci_from_bcp(address bcp) const {
349 // keep bci as -1 if not a valid bci
350 int bci = -1;
351 if (bcp == nullptr || bcp == code_base()) {
352 // code_size() may return 0 and we allow 0 here
353 // the method may be native
354 bci = 0;
355 } else if (contains(bcp)) {
356 bci = int(bcp - code_base());
357 }
358 // Assert that if we have dodged any asserts, bci is negative.
359 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
360 return bci;
361 }
362
363 address Method::bcp_from(int bci) const {
364 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
365 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
366 address bcp = code_base() + bci;
367 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
368 return bcp;
369 }
370
371 address Method::bcp_from(address bcp) const {
372 if (is_native() && bcp == nullptr) {
373 return code_base();
374 } else {
375 return bcp;
376 }
377 }
378
379 int Method::size(bool is_native) {
380 // If native, then include pointers for native_function and signature_handler
381 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
382 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
383 return align_metadata_size(header_size() + extra_words);
384 }
385
386 Symbol* Method::klass_name() const {
387 return method_holder()->name();
388 }
389
390 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
391 log_trace(aot)("Iter(Method): %p", this);
392
393 if (!method_holder()->is_rewritten()) {
394 it->push(&_constMethod, MetaspaceClosure::_writable);
395 } else {
396 it->push(&_constMethod);
397 }
398 it->push(&_adapter);
399 it->push(&_method_data);
400 it->push(&_method_counters);
401 NOT_PRODUCT(it->push(&_name);)
402 }
403
404 #if INCLUDE_CDS
405 // Attempt to return method to original state. Clear any pointers
406 // (to objects outside the shared spaces). We won't be able to predict
407 // where they should point in a new JVM. Further initialize some
408 // entries now in order allow them to be write protected later.
409
410 void Method::remove_unshareable_info() {
411 unlink_method();
412 if (method_data() != nullptr) {
413 method_data()->remove_unshareable_info();
414 }
415 if (method_counters() != nullptr) {
416 method_counters()->remove_unshareable_info();
417 }
418 if (CDSConfig::is_dumping_adapters() && _adapter != nullptr) {
419 _adapter->remove_unshareable_info();
420 _adapter = nullptr;
421 }
422 JFR_ONLY(REMOVE_METHOD_ID(this);)
423 }
424
425 void Method::restore_unshareable_info(TRAPS) {
426 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
427 if (method_data() != nullptr) {
428 method_data()->restore_unshareable_info(CHECK);
429 }
430 if (method_counters() != nullptr) {
431 method_counters()->restore_unshareable_info(CHECK);
432 }
433 if (_adapter != nullptr) {
434 assert(_adapter->is_linked(), "must be");
435 _from_compiled_entry = _adapter->get_c2i_entry();
436 }
437 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
438 }
439 #endif
440
441 void Method::set_vtable_index(int index) {
442 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
443 // At runtime initialize_vtable is rerun as part of link_class_impl()
444 // for a shared class loaded by the non-boot loader to obtain the loader
445 // constraints based on the runtime classloaders' context.
446 return; // don't write into the shared class
447 } else {
448 _vtable_index = index;
449 }
450 }
451
452 void Method::set_itable_index(int index) {
453 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
454 // At runtime initialize_itable is rerun as part of link_class_impl()
455 // for a shared class loaded by the non-boot loader to obtain the loader
456 // constraints based on the runtime classloaders' context. The dumptime
457 // itable index should be the same as the runtime index.
458 assert(_vtable_index == itable_index_max - index,
459 "archived itable index is different from runtime index");
460 return; // don't write into the shared class
461 } else {
462 _vtable_index = itable_index_max - index;
463 }
464 assert(valid_itable_index(), "");
465 }
466
467 // The RegisterNatives call being attempted tried to register with a method that
468 // is not native. Ask JVM TI what prefixes have been specified. Then check
469 // to see if the native method is now wrapped with the prefixes. See the
470 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
471 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
472 #if INCLUDE_JVMTI
473 ResourceMark rm(THREAD);
474 Method* method;
475 int name_len = name->utf8_length();
476 char* name_str = name->as_utf8();
477 int prefix_count;
478 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
479 for (int i = 0; i < prefix_count; i++) {
480 char* prefix = prefixes[i];
481 int prefix_len = (int)strlen(prefix);
482
483 // try adding this prefix to the method name and see if it matches another method name
484 int trial_len = name_len + prefix_len;
485 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
486 strcpy(trial_name_str, prefix);
487 strcat(trial_name_str, name_str);
488 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
489 if (trial_name == nullptr) {
490 continue; // no such symbol, so this prefix wasn't used, try the next prefix
491 }
492 method = k->lookup_method(trial_name, signature);
493 if (method == nullptr) {
494 continue; // signature doesn't match, try the next prefix
495 }
496 if (method->is_native()) {
497 method->set_is_prefixed_native();
498 return method; // wahoo, we found a prefixed version of the method, return it
499 }
500 // found as non-native, so prefix is good, add it, probably just need more prefixes
501 name_len = trial_len;
502 name_str = trial_name_str;
503 }
504 #endif // INCLUDE_JVMTI
505 return nullptr; // not found
506 }
507
508 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
509 Method* method = k->lookup_method(name, signature);
510 if (method == nullptr) {
511 ResourceMark rm(THREAD);
512 stringStream st;
513 st.print("Method '");
514 print_external_name(&st, k, name, signature);
515 st.print("' name or signature does not match");
516 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
517 }
518 if (!method->is_native()) {
519 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
520 method = find_prefixed_native(k, name, signature, THREAD);
521 if (method == nullptr) {
522 ResourceMark rm(THREAD);
523 stringStream st;
524 st.print("Method '");
525 print_external_name(&st, k, name, signature);
526 st.print("' is not declared as native");
527 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
528 }
529 }
530
531 if (entry != nullptr) {
532 method->set_native_function(entry, native_bind_event_is_interesting);
533 } else {
534 method->clear_native_function();
535 }
536 if (log_is_enabled(Debug, jni, resolve)) {
537 ResourceMark rm(THREAD);
538 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
539 method->method_holder()->external_name(),
540 method->name()->as_C_string());
541 }
542 return true;
543 }
544
545 bool Method::was_executed_more_than(int n) {
546 // Invocation counter is reset when the Method* is compiled.
547 // If the method has compiled code we therefore assume it has
548 // be executed more than n times.
549 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
550 // interpreter doesn't bump invocation counter of trivial methods
551 // compiler does not bump invocation counter of compiled methods
552 return true;
553 }
554 else if ((method_counters() != nullptr &&
555 method_counters()->invocation_counter()->carry()) ||
556 (method_data() != nullptr &&
557 method_data()->invocation_counter()->carry())) {
558 // The carry bit is set when the counter overflows and causes
559 // a compilation to occur. We don't know how many times
560 // the counter has been reset, so we simply assume it has
561 // been executed more than n times.
562 return true;
563 } else {
564 return invocation_count() > n;
565 }
566 }
567
568 void Method::print_invocation_count(outputStream* st) {
569 //---< compose+print method return type, klass, name, and signature >---
570 if (is_static()) { st->print("static "); }
571 if (is_final()) { st->print("final "); }
572 if (is_synchronized()) { st->print("synchronized "); }
573 if (is_native()) { st->print("native "); }
574 st->print("%s::", method_holder()->external_name());
575 name()->print_symbol_on(st);
576 signature()->print_symbol_on(st);
577
578 if (WizardMode) {
579 // dump the size of the byte codes
580 st->print(" {%d}", code_size());
581 }
582 st->cr();
583
584 // Counting based on signed int counters tends to overflow with
585 // longer-running workloads on fast machines. The counters under
586 // consideration here, however, are limited in range by counting
587 // logic. See InvocationCounter:count_limit for example.
588 // No "overflow precautions" need to be implemented here.
589 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
590 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
591 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
592
593 if (method_data() != nullptr) {
594 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
595 }
596
597 #ifndef PRODUCT
598 if (CountCompiledCalls) {
599 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
600 }
601 #endif
602 }
603
604 MethodTrainingData* Method::training_data_or_null() const {
605 MethodCounters* mcs = method_counters();
606 if (mcs == nullptr) {
607 return nullptr;
608 } else {
609 MethodTrainingData* mtd = mcs->method_training_data();
610 if (mtd == mcs->method_training_data_sentinel()) {
611 return nullptr;
612 }
613 return mtd;
614 }
615 }
616
617 bool Method::init_training_data(MethodTrainingData* td) {
618 MethodCounters* mcs = method_counters();
619 if (mcs == nullptr) {
620 return false;
621 } else {
622 return mcs->init_method_training_data(td);
623 }
624 }
625
626 bool Method::install_training_method_data(const methodHandle& method) {
627 MethodTrainingData* mtd = MethodTrainingData::find(method);
628 if (mtd != nullptr && mtd->final_profile() != nullptr) {
629 Atomic::replace_if_null(&method->_method_data, mtd->final_profile());
630 return true;
631 }
632 return false;
633 }
634
635 // Build a MethodData* object to hold profiling information collected on this
636 // method when requested.
637 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
638 if (install_training_method_data(method)) {
639 return;
640 }
641 // Do not profile the method if metaspace has hit an OOM previously
642 // allocating profiling data. Callers clear pending exception so don't
643 // add one here.
644 if (ClassLoaderDataGraph::has_metaspace_oom()) {
645 return;
646 }
647
648 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
649 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
650 if (HAS_PENDING_EXCEPTION) {
651 CompileBroker::log_metaspace_failure();
652 ClassLoaderDataGraph::set_metaspace_oom(true);
653 return; // return the exception (which is cleared)
654 }
655
656 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
657 MetadataFactory::free_metadata(loader_data, method_data);
658 return;
659 }
660
661 if (PrintMethodData && (Verbose || WizardMode)) {
662 ResourceMark rm(THREAD);
663 tty->print("build_profiling_method_data for ");
664 method->print_name(tty);
665 tty->cr();
666 // At the end of the run, the MDO, full of data, will be dumped.
667 }
668 }
669
670 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
671 // Do not profile the method if metaspace has hit an OOM previously
672 if (ClassLoaderDataGraph::has_metaspace_oom()) {
673 return nullptr;
674 }
675
676 methodHandle mh(current, m);
677 MethodCounters* counters;
678 if (current->is_Java_thread()) {
679 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
680 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
681 // if needed.
682 counters = MethodCounters::allocate_with_exception(mh, THREAD);
683 if (HAS_PENDING_EXCEPTION) {
684 CLEAR_PENDING_EXCEPTION;
685 }
686 } else {
687 // Call metaspace allocation that doesn't throw exception if the
688 // current thread isn't a JavaThread, ie. the VMThread.
689 counters = MethodCounters::allocate_no_exception(mh);
690 }
691
692 if (counters == nullptr) {
693 CompileBroker::log_metaspace_failure();
694 ClassLoaderDataGraph::set_metaspace_oom(true);
695 return nullptr;
696 }
697
698 if (!mh->init_method_counters(counters)) {
699 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
700 }
701
702 return mh->method_counters();
703 }
704
705 bool Method::init_method_counters(MethodCounters* counters) {
706 // Try to install a pointer to MethodCounters, return true on success.
707 return Atomic::replace_if_null(&_method_counters, counters);
708 }
709
710 void Method::set_exception_handler_entered(int handler_bci) {
711 if (ProfileExceptionHandlers) {
712 MethodData* mdo = method_data();
713 if (mdo != nullptr) {
714 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
715 handler_data.set_exception_handler_entered();
716 }
717 }
718 }
719
720 int Method::extra_stack_words() {
721 // not an inline function, to avoid a header dependency on Interpreter
722 return extra_stack_entries() * Interpreter::stackElementSize;
723 }
724
725 bool Method::compute_has_loops_flag() {
726 BytecodeStream bcs(methodHandle(Thread::current(), this));
727 Bytecodes::Code bc;
728
729 while ((bc = bcs.next()) >= 0) {
730 switch (bc) {
731 case Bytecodes::_ifeq:
732 case Bytecodes::_ifnull:
733 case Bytecodes::_iflt:
734 case Bytecodes::_ifle:
735 case Bytecodes::_ifne:
736 case Bytecodes::_ifnonnull:
737 case Bytecodes::_ifgt:
738 case Bytecodes::_ifge:
739 case Bytecodes::_if_icmpeq:
740 case Bytecodes::_if_icmpne:
741 case Bytecodes::_if_icmplt:
742 case Bytecodes::_if_icmpgt:
743 case Bytecodes::_if_icmple:
744 case Bytecodes::_if_icmpge:
745 case Bytecodes::_if_acmpeq:
746 case Bytecodes::_if_acmpne:
747 case Bytecodes::_goto:
748 case Bytecodes::_jsr:
749 if (bcs.dest() < bcs.next_bci()) {
750 return set_has_loops();
751 }
752 break;
753
754 case Bytecodes::_goto_w:
755 case Bytecodes::_jsr_w:
756 if (bcs.dest_w() < bcs.next_bci()) {
757 return set_has_loops();
758 }
759 break;
760
761 case Bytecodes::_lookupswitch: {
762 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
763 if (lookupswitch.default_offset() < 0) {
764 return set_has_loops();
765 } else {
766 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
767 LookupswitchPair pair = lookupswitch.pair_at(i);
768 if (pair.offset() < 0) {
769 return set_has_loops();
770 }
771 }
772 }
773 break;
774 }
775 case Bytecodes::_tableswitch: {
776 Bytecode_tableswitch tableswitch(this, bcs.bcp());
777 if (tableswitch.default_offset() < 0) {
778 return set_has_loops();
779 } else {
780 for (int i = 0; i < tableswitch.length(); ++i) {
781 if (tableswitch.dest_offset_at(i) < 0) {
782 return set_has_loops();
783 }
784 }
785 }
786 break;
787 }
788 default:
789 break;
790 }
791 }
792
793 _flags.set_has_loops_flag_init(true);
794 return false;
795 }
796
797 bool Method::is_final_method(AccessFlags class_access_flags) const {
798 // or "does_not_require_vtable_entry"
799 // default method or overpass can occur, is not final (reuses vtable entry)
800 // private methods in classes get vtable entries for backward class compatibility.
801 if (is_overpass() || is_default_method()) return false;
802 return is_final() || class_access_flags.is_final();
803 }
804
805 bool Method::is_final_method() const {
806 return is_final_method(method_holder()->access_flags());
807 }
808
809 bool Method::is_default_method() const {
810 if (method_holder() != nullptr &&
811 method_holder()->is_interface() &&
812 !is_abstract() && !is_private()) {
813 return true;
814 } else {
815 return false;
816 }
817 }
818
819 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
820 if (is_final_method(class_access_flags)) return true;
821 #ifdef ASSERT
822 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
823 if (class_access_flags.is_interface()) {
824 ResourceMark rm;
825 assert(is_nonv == is_static() || is_nonv == is_private(),
826 "nonvirtual unexpected for non-static, non-private: %s",
827 name_and_sig_as_C_string());
828 }
829 #endif
830 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
831 return vtable_index() == nonvirtual_vtable_index;
832 }
833
834 bool Method::can_be_statically_bound() const {
835 return can_be_statically_bound(method_holder()->access_flags());
836 }
837
838 bool Method::can_be_statically_bound(InstanceKlass* context) const {
839 return (method_holder() == context) && can_be_statically_bound();
840 }
841
842 /**
843 * Returns false if this is one of specially treated methods for
844 * which we have to provide stack trace in throw in compiled code.
845 * Returns true otherwise.
846 */
847 bool Method::can_omit_stack_trace() {
848 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
849 return false; // All methods in sun.invoke.util.ValueConversions
850 }
851 return true;
852 }
853
854 bool Method::is_accessor() const {
855 return is_getter() || is_setter();
856 }
857
858 bool Method::is_getter() const {
859 if (code_size() != 5) return false;
860 if (size_of_parameters() != 1) return false;
861 if (java_code_at(0) != Bytecodes::_aload_0) return false;
862 if (java_code_at(1) != Bytecodes::_getfield) return false;
863 switch (java_code_at(4)) {
864 case Bytecodes::_ireturn:
865 case Bytecodes::_lreturn:
866 case Bytecodes::_freturn:
867 case Bytecodes::_dreturn:
868 case Bytecodes::_areturn:
869 break;
870 default:
871 return false;
872 }
873 return true;
874 }
875
876 bool Method::is_setter() const {
877 if (code_size() != 6) return false;
878 if (java_code_at(0) != Bytecodes::_aload_0) return false;
879 switch (java_code_at(1)) {
880 case Bytecodes::_iload_1:
881 case Bytecodes::_aload_1:
882 case Bytecodes::_fload_1:
883 if (size_of_parameters() != 2) return false;
884 break;
885 case Bytecodes::_dload_1:
886 case Bytecodes::_lload_1:
887 if (size_of_parameters() != 3) return false;
888 break;
889 default:
890 return false;
891 }
892 if (java_code_at(2) != Bytecodes::_putfield) return false;
893 if (java_code_at(5) != Bytecodes::_return) return false;
894 return true;
895 }
896
897 bool Method::is_constant_getter() const {
898 int last_index = code_size() - 1;
899 // Check if the first 1-3 bytecodes are a constant push
900 // and the last bytecode is a return.
901 return (2 <= code_size() && code_size() <= 4 &&
902 Bytecodes::is_const(java_code_at(0)) &&
903 Bytecodes::length_for(java_code_at(0)) == last_index &&
904 Bytecodes::is_return(java_code_at(last_index)));
905 }
906
907 bool Method::has_valid_initializer_flags() const {
908 return (is_static() ||
909 method_holder()->major_version() < 51);
910 }
911
912 bool Method::is_static_initializer() const {
913 // For classfiles version 51 or greater, ensure that the clinit method is
914 // static. Non-static methods with the name "<clinit>" are not static
915 // initializers. (older classfiles exempted for backward compatibility)
916 return name() == vmSymbols::class_initializer_name() &&
917 has_valid_initializer_flags();
918 }
919
920 bool Method::is_object_initializer() const {
921 return name() == vmSymbols::object_initializer_name();
922 }
923
924 bool Method::needs_clinit_barrier() const {
925 return is_static() && !method_holder()->is_initialized();
926 }
927
928 bool Method::is_object_wait0() const {
929 return klass_name() == vmSymbols::java_lang_Object()
930 && name() == vmSymbols::wait_name();
931 }
932
933 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
934 int length = method->checked_exceptions_length();
935 if (length == 0) { // common case
936 return objArrayHandle(THREAD, Universe::the_empty_class_array());
937 } else {
938 methodHandle h_this(THREAD, method);
939 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
940 objArrayHandle mirrors (THREAD, m_oop);
941 for (int i = 0; i < length; i++) {
942 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
943 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
944 if (log_is_enabled(Warning, exceptions) &&
945 !k->is_subclass_of(vmClasses::Throwable_klass())) {
946 ResourceMark rm(THREAD);
947 log_warning(exceptions)(
948 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
949 k->external_name(), method->external_name());
950 }
951 mirrors->obj_at_put(i, k->java_mirror());
952 }
953 return mirrors;
954 }
955 };
956
957
958 int Method::line_number_from_bci(int bci) const {
959 int best_bci = 0;
960 int best_line = -1;
961 if (bci == SynchronizationEntryBCI) bci = 0;
962 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
963 // The line numbers are a short array of 2-tuples [start_pc, line_number].
964 // Not necessarily sorted and not necessarily one-to-one.
965 CompressedLineNumberReadStream stream(compressed_linenumber_table());
966 while (stream.read_pair()) {
967 if (stream.bci() == bci) {
968 // perfect match
969 return stream.line();
970 } else {
971 // update best_bci/line
972 if (stream.bci() < bci && stream.bci() >= best_bci) {
973 best_bci = stream.bci();
974 best_line = stream.line();
975 }
976 }
977 }
978 }
979 return best_line;
980 }
981
982
983 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
984 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
985 Thread *thread = Thread::current();
986 Symbol* klass_name = constants()->klass_name_at(klass_index);
987 Handle loader(thread, method_holder()->class_loader());
988 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr;
989 } else {
990 return true;
991 }
992 }
993
994
995 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
996 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
997 if (must_be_resolved) {
998 // Make sure klass is resolved in constantpool.
999 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
1000 }
1001 return is_klass_loaded_by_klass_index(klass_index);
1002 }
1003
1004
1005 void Method::set_native_function(address function, bool post_event_flag) {
1006 assert(function != nullptr, "use clear_native_function to unregister natives");
1007 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1008 address* native_function = native_function_addr();
1009
1010 // We can see racers trying to place the same native function into place. Once
1011 // is plenty.
1012 address current = *native_function;
1013 if (current == function) return;
1014 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1015 function != nullptr) {
1016 // native_method_throw_unsatisfied_link_error_entry() should only
1017 // be passed when post_event_flag is false.
1018 assert(function !=
1019 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1020 "post_event_flag mismatch");
1021
1022 // post the bind event, and possible change the bind function
1023 JvmtiExport::post_native_method_bind(this, &function);
1024 }
1025 *native_function = function;
1026 // This function can be called more than once. We must make sure that we always
1027 // use the latest registered method -> check if a stub already has been generated.
1028 // If so, we have to make it not_entrant.
1029 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1030 if (nm != nullptr) {
1031 nm->make_not_entrant("set native function");
1032 }
1033 }
1034
1035
1036 bool Method::has_native_function() const {
1037 if (is_special_native_intrinsic())
1038 return false; // special-cased in SharedRuntime::generate_native_wrapper
1039 address func = native_function();
1040 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1041 }
1042
1043
1044 void Method::clear_native_function() {
1045 // Note: is_method_handle_intrinsic() is allowed here.
1046 set_native_function(
1047 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1048 !native_bind_event_is_interesting);
1049 this->unlink_code();
1050 }
1051
1052
1053 void Method::set_signature_handler(address handler) {
1054 address* signature_handler = signature_handler_addr();
1055 *signature_handler = handler;
1056 }
1057
1058
1059 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1060 assert(reason != nullptr, "must provide a reason");
1061 if (PrintCompilation && report) {
1062 ttyLocker ttyl;
1063 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1064 if (comp_level == CompLevel_all) {
1065 tty->print("all levels ");
1066 } else {
1067 tty->print("level %d ", comp_level);
1068 }
1069 this->print_short_name(tty);
1070 int size = this->code_size();
1071 if (size > 0) {
1072 tty->print(" (%d bytes)", size);
1073 }
1074 if (reason != nullptr) {
1075 tty->print(" %s", reason);
1076 }
1077 tty->cr();
1078 }
1079 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1080 ttyLocker ttyl;
1081 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'",
1082 os::current_thread_id(), is_osr, comp_level);
1083 if (reason != nullptr) {
1084 xtty->print(" reason=\'%s\'", reason);
1085 }
1086 xtty->method(this);
1087 xtty->stamp();
1088 xtty->end_elem();
1089 }
1090 }
1091
1092 bool Method::is_always_compilable() const {
1093 // Generated adapters must be compiled
1094 if (is_special_native_intrinsic() && is_synthetic()) {
1095 assert(!is_not_c1_compilable(), "sanity check");
1096 assert(!is_not_c2_compilable(), "sanity check");
1097 return true;
1098 }
1099
1100 return false;
1101 }
1102
1103 bool Method::is_not_compilable(int comp_level) const {
1104 if (number_of_breakpoints() > 0)
1105 return true;
1106 if (is_always_compilable())
1107 return false;
1108 if (comp_level == CompLevel_any)
1109 return is_not_c1_compilable() && is_not_c2_compilable();
1110 if (is_c1_compile(comp_level))
1111 return is_not_c1_compilable();
1112 if (is_c2_compile(comp_level))
1113 return is_not_c2_compilable();
1114 return false;
1115 }
1116
1117 // call this when compiler finds that this method is not compilable
1118 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1119 if (is_always_compilable()) {
1120 // Don't mark a method which should be always compilable
1121 return;
1122 }
1123 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1124 if (comp_level == CompLevel_all) {
1125 set_is_not_c1_compilable();
1126 set_is_not_c2_compilable();
1127 } else {
1128 if (is_c1_compile(comp_level))
1129 set_is_not_c1_compilable();
1130 if (is_c2_compile(comp_level))
1131 set_is_not_c2_compilable();
1132 }
1133 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1134 }
1135
1136 bool Method::is_not_osr_compilable(int comp_level) const {
1137 if (is_not_compilable(comp_level))
1138 return true;
1139 if (comp_level == CompLevel_any)
1140 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1141 if (is_c1_compile(comp_level))
1142 return is_not_c1_osr_compilable();
1143 if (is_c2_compile(comp_level))
1144 return is_not_c2_osr_compilable();
1145 return false;
1146 }
1147
1148 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1149 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1150 if (comp_level == CompLevel_all) {
1151 set_is_not_c1_osr_compilable();
1152 set_is_not_c2_osr_compilable();
1153 } else {
1154 if (is_c1_compile(comp_level))
1155 set_is_not_c1_osr_compilable();
1156 if (is_c2_compile(comp_level))
1157 set_is_not_c2_osr_compilable();
1158 }
1159 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1160 }
1161
1162 // Revert to using the interpreter and clear out the nmethod
1163 void Method::clear_code() {
1164 // this may be null if c2i adapters have not been made yet
1165 // Only should happen at allocate time.
1166 if (adapter() == nullptr) {
1167 _from_compiled_entry = nullptr;
1168 } else {
1169 _from_compiled_entry = adapter()->get_c2i_entry();
1170 }
1171 OrderAccess::storestore();
1172 _from_interpreted_entry = _i2i_entry;
1173 OrderAccess::storestore();
1174 _code = nullptr;
1175 }
1176
1177 void Method::unlink_code(nmethod *compare) {
1178 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1179 // We need to check if either the _code or _from_compiled_code_entry_point
1180 // refer to this nmethod because there is a race in setting these two fields
1181 // in Method* as seen in bugid 4947125.
1182 if (code() == compare ||
1183 from_compiled_entry() == compare->verified_entry_point()) {
1184 clear_code();
1185 }
1186 }
1187
1188 void Method::unlink_code() {
1189 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1190 clear_code();
1191 }
1192
1193 #if INCLUDE_CDS
1194 // Called by class data sharing to remove any entry points (which are not shared)
1195 void Method::unlink_method() {
1196 assert(CDSConfig::is_dumping_archive(), "sanity");
1197 _code = nullptr;
1198 if (!CDSConfig::is_dumping_adapters() || AdapterHandlerLibrary::is_abstract_method_adapter(_adapter)) {
1199 _adapter = nullptr;
1200 }
1201 _i2i_entry = nullptr;
1202 _from_compiled_entry = nullptr;
1203 _from_interpreted_entry = nullptr;
1204
1205 if (is_native()) {
1206 *native_function_addr() = nullptr;
1207 set_signature_handler(nullptr);
1208 }
1209 NOT_PRODUCT(set_compiled_invocation_count(0);)
1210
1211 clear_method_data();
1212 clear_method_counters();
1213 clear_is_not_c1_compilable();
1214 clear_is_not_c1_osr_compilable();
1215 clear_is_not_c2_compilable();
1216 clear_is_not_c2_osr_compilable();
1217 clear_queued_for_compilation();
1218
1219 remove_unshareable_flags();
1220 }
1221
1222 void Method::remove_unshareable_flags() {
1223 // clear all the flags that shouldn't be in the archived version
1224 assert(!is_old(), "must be");
1225 assert(!is_obsolete(), "must be");
1226 assert(!is_deleted(), "must be");
1227
1228 set_is_prefixed_native(false);
1229 set_queued_for_compilation(false);
1230 set_is_not_c2_compilable(false);
1231 set_is_not_c1_compilable(false);
1232 set_is_not_c2_osr_compilable(false);
1233 set_on_stack_flag(false);
1234 }
1235 #endif
1236
1237 // Called when the method_holder is getting linked. Setup entrypoints so the method
1238 // is ready to be called from interpreter, compiler, and vtables.
1239 void Method::link_method(const methodHandle& h_method, TRAPS) {
1240 if (log_is_enabled(Info, perf, class, link)) {
1241 ClassLoader::perf_ik_link_methods_count()->inc();
1242 }
1243
1244 // If the code cache is full, we may reenter this function for the
1245 // leftover methods that weren't linked.
1246 if (adapter() != nullptr) {
1247 if (adapter()->is_shared()) {
1248 assert(adapter()->is_linked(), "Adapter is shared but not linked");
1249 } else {
1250 return;
1251 }
1252 }
1253 assert( _code == nullptr, "nothing compiled yet" );
1254
1255 // Setup interpreter entrypoint
1256 assert(this == h_method(), "wrong h_method()" );
1257
1258 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache");
1259 address entry = Interpreter::entry_for_method(h_method);
1260 assert(entry != nullptr, "interpreter entry must be non-null");
1261 // Sets both _i2i_entry and _from_interpreted_entry
1262 set_interpreter_entry(entry);
1263
1264 // Don't overwrite already registered native entries.
1265 if (is_native() && !has_native_function()) {
1266 set_native_function(
1267 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1268 !native_bind_event_is_interesting);
1269 }
1270
1271 // Setup compiler entrypoint. This is made eagerly, so we do not need
1272 // special handling of vtables. An alternative is to make adapters more
1273 // lazily by calling make_adapter() from from_compiled_entry() for the
1274 // normal calls. For vtable calls life gets more complicated. When a
1275 // call-site goes mega-morphic we need adapters in all methods which can be
1276 // called from the vtable. We need adapters on such methods that get loaded
1277 // later. Ditto for mega-morphic itable calls. If this proves to be a
1278 // problem we'll make these lazily later.
1279 if (_adapter == nullptr) {
1280 (void) make_adapters(h_method, CHECK);
1281 assert(adapter()->is_linked(), "Adapter must have been linked");
1282 }
1283
1284 // ONLY USE the h_method now as make_adapter may have blocked
1285
1286 if (h_method->is_continuation_native_intrinsic()) {
1287 _from_interpreted_entry = nullptr;
1288 _from_compiled_entry = nullptr;
1289 _i2i_entry = nullptr;
1290 if (Continuations::enabled()) {
1291 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1292 AdapterHandlerLibrary::create_native_wrapper(h_method);
1293 if (!h_method->has_compiled_code()) {
1294 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1295 }
1296 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1297 }
1298 }
1299 }
1300
1301 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1302 PerfTraceTime timer(ClassLoader::perf_method_adapters_time());
1303
1304 // Adapters for compiled code are made eagerly here. They are fairly
1305 // small (generally < 100 bytes) and quick to make (and cached and shared)
1306 // so making them eagerly shouldn't be too expensive.
1307 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1308 if (adapter == nullptr ) {
1309 if (!is_init_completed()) {
1310 // Don't throw exceptions during VM initialization because java.lang.* classes
1311 // might not have been initialized, causing problems when constructing the
1312 // Java exception object.
1313 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1314 } else {
1315 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1316 }
1317 }
1318
1319 mh->set_adapter_entry(adapter);
1320 mh->_from_compiled_entry = adapter->get_c2i_entry();
1321 return adapter->get_c2i_entry();
1322 }
1323
1324 // The verified_code_entry() must be called when a invoke is resolved
1325 // on this method.
1326
1327 // It returns the compiled code entry point, after asserting not null.
1328 // This function is called after potential safepoints so that nmethod
1329 // or adapter that it points to is still live and valid.
1330 // This function must not hit a safepoint!
1331 address Method::verified_code_entry() {
1332 DEBUG_ONLY(NoSafepointVerifier nsv;)
1333 assert(_from_compiled_entry != nullptr, "must be set");
1334 return _from_compiled_entry;
1335 }
1336
1337 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1338 // (could be racing a deopt).
1339 // Not inline to avoid circular ref.
1340 bool Method::check_code() const {
1341 // cached in a register or local. There's a race on the value of the field.
1342 nmethod *code = Atomic::load_acquire(&_code);
1343 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1344 }
1345
1346 // Install compiled code. Instantly it can execute.
1347 void Method::set_code(const methodHandle& mh, nmethod *code) {
1348 assert_lock_strong(NMethodState_lock);
1349 assert( code, "use clear_code to remove code" );
1350 assert( mh->check_code(), "" );
1351
1352 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1353
1354 // These writes must happen in this order, because the interpreter will
1355 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1356 // which jumps to _from_compiled_entry.
1357 mh->_code = code; // Assign before allowing compiled code to exec
1358
1359 int comp_level = code->comp_level();
1360 // In theory there could be a race here. In practice it is unlikely
1361 // and not worth worrying about.
1362 if (comp_level > mh->highest_comp_level()) {
1363 mh->set_highest_comp_level(comp_level);
1364 }
1365
1366 OrderAccess::storestore();
1367 mh->_from_compiled_entry = code->verified_entry_point();
1368 OrderAccess::storestore();
1369
1370 if (mh->is_continuation_native_intrinsic()) {
1371 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1372
1373 if (mh->is_continuation_enter_intrinsic()) {
1374 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1375 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1376 } else if (mh->is_continuation_yield_intrinsic()) {
1377 mh->_i2i_entry = mh->get_i2c_entry();
1378 } else {
1379 guarantee(false, "Unknown Continuation native intrinsic");
1380 }
1381 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1382 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1383 } else if (!mh->is_method_handle_intrinsic()) {
1384 // Instantly compiled code can execute.
1385 mh->_from_interpreted_entry = mh->get_i2c_entry();
1386 }
1387 }
1388
1389
1390 bool Method::is_overridden_in(Klass* k) const {
1391 InstanceKlass* ik = InstanceKlass::cast(k);
1392
1393 if (ik->is_interface()) return false;
1394
1395 // If method is an interface, we skip it - except if it
1396 // is a miranda method
1397 if (method_holder()->is_interface()) {
1398 // Check that method is not a miranda method
1399 if (ik->lookup_method(name(), signature()) == nullptr) {
1400 // No implementation exist - so miranda method
1401 return false;
1402 }
1403 return true;
1404 }
1405
1406 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1407 if (!has_vtable_index()) {
1408 return false;
1409 } else {
1410 Method* vt_m = ik->method_at_vtable(vtable_index());
1411 return vt_m != this;
1412 }
1413 }
1414
1415
1416 // give advice about whether this Method* should be cached or not
1417 bool Method::should_not_be_cached() const {
1418 if (is_old()) {
1419 // This method has been redefined. It is either EMCP or obsolete
1420 // and we don't want to cache it because that would pin the method
1421 // down and prevent it from being collectible if and when it
1422 // finishes executing.
1423 return true;
1424 }
1425
1426 // caching this method should be just fine
1427 return false;
1428 }
1429
1430
1431 /**
1432 * Returns true if this is one of the specially treated methods for
1433 * security related stack walks (like Reflection.getCallerClass).
1434 */
1435 bool Method::is_ignored_by_security_stack_walk() const {
1436 if (intrinsic_id() == vmIntrinsics::_invoke) {
1437 // This is Method.invoke() -- ignore it
1438 return true;
1439 }
1440 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1441 // This is an auxiliary frame -- ignore it
1442 return true;
1443 }
1444 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1445 // This is an internal adapter frame for method handles -- ignore it
1446 return true;
1447 }
1448 return false;
1449 }
1450
1451
1452 // Constant pool structure for invoke methods:
1453 enum {
1454 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1455 _imcp_invoke_signature, // utf8: (variable Symbol*)
1456 _imcp_limit
1457 };
1458
1459 // Test if this method is an MH adapter frame generated by Java code.
1460 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1461 bool Method::is_compiled_lambda_form() const {
1462 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1463 }
1464
1465 // Test if this method is an internal MH primitive method.
1466 bool Method::is_method_handle_intrinsic() const {
1467 vmIntrinsics::ID iid = intrinsic_id();
1468 return (MethodHandles::is_signature_polymorphic(iid) &&
1469 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1470 }
1471
1472 bool Method::has_member_arg() const {
1473 vmIntrinsics::ID iid = intrinsic_id();
1474 return (MethodHandles::is_signature_polymorphic(iid) &&
1475 MethodHandles::has_member_arg(iid));
1476 }
1477
1478 // Make an instance of a signature-polymorphic internal MH primitive.
1479 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1480 Symbol* signature,
1481 TRAPS) {
1482 ResourceMark rm(THREAD);
1483 methodHandle empty;
1484
1485 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1486 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1487 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1488
1489 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1490
1491 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1492 name->increment_refcount();
1493 signature->increment_refcount();
1494
1495 int cp_length = _imcp_limit;
1496 ClassLoaderData* loader_data = holder->class_loader_data();
1497 constantPoolHandle cp;
1498 {
1499 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1500 cp = constantPoolHandle(THREAD, cp_oop);
1501 }
1502 cp->copy_fields(holder->constants());
1503 cp->set_pool_holder(holder);
1504 cp->symbol_at_put(_imcp_invoke_name, name);
1505 cp->symbol_at_put(_imcp_invoke_signature, signature);
1506 cp->set_has_preresolution();
1507 cp->set_is_for_method_handle_intrinsic();
1508
1509 // decide on access bits: public or not?
1510 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1511 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1512 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1513 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1514
1515 methodHandle m;
1516 {
1517 InlineTableSizes sizes;
1518 Method* m_oop = Method::allocate(loader_data, 0,
1519 accessFlags_from(flags_bits), &sizes,
1520 ConstMethod::NORMAL,
1521 name,
1522 CHECK_(empty));
1523 m = methodHandle(THREAD, m_oop);
1524 }
1525 m->set_constants(cp());
1526 m->set_name_index(_imcp_invoke_name);
1527 m->set_signature_index(_imcp_invoke_signature);
1528 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1529 assert(m->signature() == signature, "");
1530 m->constMethod()->compute_from_signature(signature, must_be_static);
1531 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1532 assert(m->is_method_handle_intrinsic(), "");
1533 #ifdef ASSERT
1534 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1535 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1536 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1537 #endif //ASSERT
1538
1539 // Finally, set up its entry points.
1540 assert(m->can_be_statically_bound(), "");
1541 m->set_vtable_index(Method::nonvirtual_vtable_index);
1542 m->link_method(m, CHECK_(empty));
1543
1544 if (iid == vmIntrinsics::_linkToNative) {
1545 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1546 }
1547 if (log_is_enabled(Debug, methodhandles)) {
1548 LogTarget(Debug, methodhandles) lt;
1549 LogStream ls(lt);
1550 m->print_on(&ls);
1551 }
1552
1553 return m;
1554 }
1555
1556 #if INCLUDE_CDS
1557 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1558 if (m->adapter() != nullptr) {
1559 m->set_from_compiled_entry(m->adapter()->get_c2i_entry());
1560 }
1561 m->link_method(m, CHECK);
1562
1563 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1564 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1565 }
1566 }
1567 #endif
1568
1569 Klass* Method::check_non_bcp_klass(Klass* klass) {
1570 if (klass != nullptr && klass->class_loader() != nullptr) {
1571 if (klass->is_objArray_klass())
1572 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1573 return klass;
1574 }
1575 return nullptr;
1576 }
1577
1578
1579 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1580 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1581 // Code below does not work for native methods - they should never get rewritten anyway
1582 assert(!m->is_native(), "cannot rewrite native methods");
1583 // Allocate new Method*
1584 AccessFlags flags = m->access_flags();
1585
1586 ConstMethod* cm = m->constMethod();
1587 int checked_exceptions_len = cm->checked_exceptions_length();
1588 int localvariable_len = cm->localvariable_table_length();
1589 int exception_table_len = cm->exception_table_length();
1590 int method_parameters_len = cm->method_parameters_length();
1591 int method_annotations_len = cm->method_annotations_length();
1592 int parameter_annotations_len = cm->parameter_annotations_length();
1593 int type_annotations_len = cm->type_annotations_length();
1594 int default_annotations_len = cm->default_annotations_length();
1595
1596 InlineTableSizes sizes(
1597 localvariable_len,
1598 new_compressed_linenumber_size,
1599 exception_table_len,
1600 checked_exceptions_len,
1601 method_parameters_len,
1602 cm->generic_signature_index(),
1603 method_annotations_len,
1604 parameter_annotations_len,
1605 type_annotations_len,
1606 default_annotations_len,
1607 0);
1608
1609 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1610 Method* newm_oop = Method::allocate(loader_data,
1611 new_code_length,
1612 flags,
1613 &sizes,
1614 m->method_type(),
1615 m->name(),
1616 CHECK_(methodHandle()));
1617 methodHandle newm (THREAD, newm_oop);
1618
1619 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1620 ConstMethod* newcm = newm->constMethod();
1621 int new_const_method_size = newm->constMethod()->size();
1622
1623 // This works because the source and target are both Methods. Some compilers
1624 // (e.g., clang) complain that the target vtable pointer will be stomped,
1625 // so cast away newm()'s and m()'s Methodness.
1626 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1627
1628 // Create shallow copy of ConstMethod.
1629 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1630
1631 // Reset correct method/const method, method size, and parameter info
1632 newm->set_constMethod(newcm);
1633 newm->constMethod()->set_code_size(new_code_length);
1634 newm->constMethod()->set_constMethod_size(new_const_method_size);
1635 assert(newm->code_size() == new_code_length, "check");
1636 assert(newm->method_parameters_length() == method_parameters_len, "check");
1637 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1638 assert(newm->exception_table_length() == exception_table_len, "check");
1639 assert(newm->localvariable_table_length() == localvariable_len, "check");
1640 // Copy new byte codes
1641 memcpy(newm->code_base(), new_code, new_code_length);
1642 // Copy line number table
1643 if (new_compressed_linenumber_size > 0) {
1644 memcpy(newm->compressed_linenumber_table(),
1645 new_compressed_linenumber_table,
1646 new_compressed_linenumber_size);
1647 }
1648 // Copy method_parameters
1649 if (method_parameters_len > 0) {
1650 memcpy(newm->method_parameters_start(),
1651 m->method_parameters_start(),
1652 method_parameters_len * sizeof(MethodParametersElement));
1653 }
1654 // Copy checked_exceptions
1655 if (checked_exceptions_len > 0) {
1656 memcpy(newm->checked_exceptions_start(),
1657 m->checked_exceptions_start(),
1658 checked_exceptions_len * sizeof(CheckedExceptionElement));
1659 }
1660 // Copy exception table
1661 if (exception_table_len > 0) {
1662 memcpy(newm->exception_table_start(),
1663 m->exception_table_start(),
1664 exception_table_len * sizeof(ExceptionTableElement));
1665 }
1666 // Copy local variable number table
1667 if (localvariable_len > 0) {
1668 memcpy(newm->localvariable_table_start(),
1669 m->localvariable_table_start(),
1670 localvariable_len * sizeof(LocalVariableTableElement));
1671 }
1672 // Copy stackmap table
1673 if (m->has_stackmap_table()) {
1674 int code_attribute_length = m->stackmap_data()->length();
1675 Array<u1>* stackmap_data =
1676 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1677 memcpy((void*)stackmap_data->adr_at(0),
1678 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1679 newm->set_stackmap_data(stackmap_data);
1680 }
1681
1682 // copy annotations over to new method
1683 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1684 return newm;
1685 }
1686
1687 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1688 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1689 // because we are not loading from core libraries
1690 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1691 // which does not use the class default class loader so we check for its loader here
1692 const InstanceKlass* ik = InstanceKlass::cast(holder);
1693 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1694 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1695 }
1696
1697 // see if the klass name is well-known:
1698 Symbol* klass_name = ik->name();
1699 vmSymbolID id = vmSymbols::find_sid(klass_name);
1700 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1701 return id;
1702 } else {
1703 return vmSymbolID::NO_SID;
1704 }
1705 }
1706
1707 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1708 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1709 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1710 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1711 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1712
1713 // the klass name is well-known:
1714 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1715 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1716
1717 // ditto for method and signature:
1718 vmSymbolID name_id = vmSymbols::find_sid(name());
1719 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1720 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1721 && name_id == vmSymbolID::NO_SID) {
1722 return;
1723 }
1724 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1725 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1726 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1727 && sig_id == vmSymbolID::NO_SID) {
1728 return;
1729 }
1730
1731 u2 flags = access_flags().as_method_flags();
1732 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1733 if (id != vmIntrinsics::_none) {
1734 set_intrinsic_id(id);
1735 if (id == vmIntrinsics::_Class_cast) {
1736 // Even if the intrinsic is rejected, we want to inline this simple method.
1737 set_force_inline();
1738 }
1739 return;
1740 }
1741
1742 // A few slightly irregular cases:
1743 switch (klass_id) {
1744 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1745 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1746 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1747 if (!is_native()) break;
1748 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1749 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1750 id = vmIntrinsics::_none;
1751 break;
1752
1753 default:
1754 break;
1755 }
1756
1757 if (id != vmIntrinsics::_none) {
1758 // Set up its iid. It is an alias method.
1759 set_intrinsic_id(id);
1760 return;
1761 }
1762 }
1763
1764 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1765 if (!THREAD->can_call_java()) {
1766 // There is nothing useful this routine can do from within the Compile thread.
1767 // Hopefully, the signature contains only well-known classes.
1768 // We could scan for this and return true/false, but the caller won't care.
1769 return false;
1770 }
1771 bool sig_is_loaded = true;
1772 ResourceMark rm(THREAD);
1773 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1774 if (ss.is_reference()) {
1775 // load everything, including arrays "[Lfoo;"
1776 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1777 // We are loading classes eagerly. If a ClassNotFoundException or
1778 // a LinkageError was generated, be sure to ignore it.
1779 if (HAS_PENDING_EXCEPTION) {
1780 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1781 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1782 CLEAR_PENDING_EXCEPTION;
1783 } else {
1784 return false;
1785 }
1786 }
1787 if( klass == nullptr) { sig_is_loaded = false; }
1788 }
1789 }
1790 return sig_is_loaded;
1791 }
1792
1793 // Exposed so field engineers can debug VM
1794 void Method::print_short_name(outputStream* st) const {
1795 ResourceMark rm;
1796 #ifdef PRODUCT
1797 st->print(" %s::", method_holder()->external_name());
1798 #else
1799 st->print(" %s::", method_holder()->internal_name());
1800 #endif
1801 name()->print_symbol_on(st);
1802 if (WizardMode) signature()->print_symbol_on(st);
1803 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1804 MethodHandles::print_as_basic_type_signature_on(st, signature());
1805 }
1806
1807 // Comparer for sorting an object array containing
1808 // Method*s.
1809 static int method_comparator(Method* a, Method* b) {
1810 return a->name()->fast_compare(b->name());
1811 }
1812
1813 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1814 // default_methods also uses this without the ordering for fast find_method
1815 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1816 int length = methods->length();
1817 if (length > 1) {
1818 if (func == nullptr) {
1819 func = method_comparator;
1820 }
1821 {
1822 NoSafepointVerifier nsv;
1823 QuickSort::sort(methods->data(), length, func);
1824 }
1825 // Reset method ordering
1826 if (set_idnums) {
1827 for (u2 i = 0; i < length; i++) {
1828 Method* m = methods->at(i);
1829 m->set_method_idnum(i);
1830 m->set_orig_method_idnum(i);
1831 }
1832 }
1833 }
1834 }
1835
1836 //-----------------------------------------------------------------------------------
1837 // Non-product code unless JVM/TI needs it
1838
1839 #if !defined(PRODUCT) || INCLUDE_JVMTI
1840 class SignatureTypePrinter : public SignatureTypeNames {
1841 private:
1842 outputStream* _st;
1843 bool _use_separator;
1844
1845 void type_name(const char* name) {
1846 if (_use_separator) _st->print(", ");
1847 _st->print("%s", name);
1848 _use_separator = true;
1849 }
1850
1851 public:
1852 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1853 _st = st;
1854 _use_separator = false;
1855 }
1856
1857 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1858 void print_returntype() { _use_separator = false; do_type(return_type()); }
1859 };
1860
1861
1862 void Method::print_name(outputStream* st) const {
1863 Thread *thread = Thread::current();
1864 ResourceMark rm(thread);
1865 st->print("%s ", is_static() ? "static" : "virtual");
1866 if (WizardMode) {
1867 st->print("%s.", method_holder()->internal_name());
1868 name()->print_symbol_on(st);
1869 signature()->print_symbol_on(st);
1870 } else {
1871 SignatureTypePrinter sig(signature(), st);
1872 sig.print_returntype();
1873 st->print(" %s.", method_holder()->internal_name());
1874 name()->print_symbol_on(st);
1875 st->print("(");
1876 sig.print_parameters();
1877 st->print(")");
1878 }
1879 }
1880 #endif // !PRODUCT || INCLUDE_JVMTI
1881
1882
1883 void Method::print_codes_on(outputStream* st, int flags) const {
1884 print_codes_on(0, code_size(), st, flags);
1885 }
1886
1887 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1888 Thread *thread = Thread::current();
1889 ResourceMark rm(thread);
1890 methodHandle mh (thread, (Method*)this);
1891 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1892 }
1893
1894 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1895 _bci = 0;
1896 _line = 0;
1897 };
1898
1899 bool CompressedLineNumberReadStream::read_pair() {
1900 jubyte next = read_byte();
1901 // Check for terminator
1902 if (next == 0) return false;
1903 if (next == 0xFF) {
1904 // Escape character, regular compression used
1905 _bci += read_signed_int();
1906 _line += read_signed_int();
1907 } else {
1908 // Single byte compression used
1909 _bci += next >> 3;
1910 _line += next & 0x7;
1911 }
1912 return true;
1913 }
1914
1915 #if INCLUDE_JVMTI
1916
1917 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1918 BreakpointInfo* bp = method_holder()->breakpoints();
1919 for (; bp != nullptr; bp = bp->next()) {
1920 if (bp->match(this, bci)) {
1921 return bp->orig_bytecode();
1922 }
1923 }
1924 {
1925 ResourceMark rm;
1926 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1927 }
1928 return Bytecodes::_shouldnotreachhere;
1929 }
1930
1931 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1932 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1933 BreakpointInfo* bp = method_holder()->breakpoints();
1934 for (; bp != nullptr; bp = bp->next()) {
1935 if (bp->match(this, bci)) {
1936 bp->set_orig_bytecode(code);
1937 // and continue, in case there is more than one
1938 }
1939 }
1940 }
1941
1942 void Method::set_breakpoint(int bci) {
1943 InstanceKlass* ik = method_holder();
1944 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1945 bp->set_next(ik->breakpoints());
1946 ik->set_breakpoints(bp);
1947 // do this last:
1948 bp->set(this);
1949 }
1950
1951 static void clear_matches(Method* m, int bci) {
1952 InstanceKlass* ik = m->method_holder();
1953 BreakpointInfo* prev_bp = nullptr;
1954 BreakpointInfo* next_bp;
1955 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1956 next_bp = bp->next();
1957 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1958 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1959 // do this first:
1960 bp->clear(m);
1961 // unhook it
1962 if (prev_bp != nullptr)
1963 prev_bp->set_next(next_bp);
1964 else
1965 ik->set_breakpoints(next_bp);
1966 delete bp;
1967 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1968 // at same location. So we have multiple matching (method_index and bci)
1969 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1970 // breakpoint for clear_breakpoint request and keep all other method versions
1971 // BreakpointInfo for future clear_breakpoint request.
1972 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1973 // which is being called when class is unloaded. We delete all the Breakpoint
1974 // information for all versions of method. We may not correctly restore the original
1975 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1976 // so these methods won't be used anymore.
1977 if (bci >= 0) {
1978 break;
1979 }
1980 } else {
1981 // This one is a keeper.
1982 prev_bp = bp;
1983 }
1984 }
1985 }
1986
1987 void Method::clear_breakpoint(int bci) {
1988 assert(bci >= 0, "");
1989 clear_matches(this, bci);
1990 }
1991
1992 void Method::clear_all_breakpoints() {
1993 clear_matches(this, -1);
1994 }
1995
1996 #endif // INCLUDE_JVMTI
1997
1998 int Method::highest_osr_comp_level() const {
1999 const MethodCounters* mcs = method_counters();
2000 if (mcs != nullptr) {
2001 return mcs->highest_osr_comp_level();
2002 } else {
2003 return CompLevel_none;
2004 }
2005 }
2006
2007 void Method::set_highest_comp_level(int level) {
2008 MethodCounters* mcs = method_counters();
2009 if (mcs != nullptr) {
2010 mcs->set_highest_comp_level(level);
2011 }
2012 }
2013
2014 void Method::set_highest_osr_comp_level(int level) {
2015 MethodCounters* mcs = method_counters();
2016 if (mcs != nullptr) {
2017 mcs->set_highest_osr_comp_level(level);
2018 }
2019 }
2020
2021 #if INCLUDE_JVMTI
2022
2023 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2024 _bci = bci;
2025 _name_index = m->name_index();
2026 _signature_index = m->signature_index();
2027 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2028 if (_orig_bytecode == Bytecodes::_breakpoint)
2029 _orig_bytecode = m->orig_bytecode_at(_bci);
2030 _next = nullptr;
2031 }
2032
2033 void BreakpointInfo::set(Method* method) {
2034 #ifdef ASSERT
2035 {
2036 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2037 if (code == Bytecodes::_breakpoint)
2038 code = method->orig_bytecode_at(_bci);
2039 assert(orig_bytecode() == code, "original bytecode must be the same");
2040 }
2041 #endif
2042 Thread *thread = Thread::current();
2043 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2044 method->incr_number_of_breakpoints(thread);
2045 {
2046 // Deoptimize all dependents on this method
2047 HandleMark hm(thread);
2048 methodHandle mh(thread, method);
2049 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2050 }
2051 }
2052
2053 void BreakpointInfo::clear(Method* method) {
2054 *method->bcp_from(_bci) = orig_bytecode();
2055 assert(method->number_of_breakpoints() > 0, "must not go negative");
2056 method->decr_number_of_breakpoints(Thread::current());
2057 }
2058
2059 #endif // INCLUDE_JVMTI
2060
2061 // jmethodID handling
2062
2063 // This is a block allocating object, sort of like JNIHandleBlock, only a
2064 // lot simpler.
2065 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2066 // never get rid of it.
2067
2068 static const int min_block_size = 8;
2069
2070 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2071 friend class JNIMethodBlock;
2072 Method** _methods;
2073 int _number_of_methods;
2074 int _top;
2075 JNIMethodBlockNode* _next;
2076
2077 public:
2078
2079 JNIMethodBlockNode(int num_methods = min_block_size);
2080
2081 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2082
2083 void ensure_methods(int num_addl_methods) {
2084 if (_top < _number_of_methods) {
2085 num_addl_methods -= _number_of_methods - _top;
2086 if (num_addl_methods <= 0) {
2087 return;
2088 }
2089 }
2090 if (_next == nullptr) {
2091 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2092 } else {
2093 _next->ensure_methods(num_addl_methods);
2094 }
2095 }
2096 };
2097
2098 class JNIMethodBlock : public CHeapObj<mtClass> {
2099 JNIMethodBlockNode _head;
2100 JNIMethodBlockNode *_last_free;
2101 public:
2102 static Method* const _free_method;
2103
2104 JNIMethodBlock(int initial_capacity = min_block_size)
2105 : _head(initial_capacity), _last_free(&_head) {}
2106
2107 void ensure_methods(int num_addl_methods) {
2108 _last_free->ensure_methods(num_addl_methods);
2109 }
2110
2111 Method** add_method(Method* m) {
2112 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2113 if (b->_top < b->_number_of_methods) {
2114 // top points to the next free entry.
2115 int i = b->_top;
2116 b->_methods[i] = m;
2117 b->_top++;
2118 _last_free = b;
2119 return &(b->_methods[i]);
2120 } else if (b->_top == b->_number_of_methods) {
2121 // if the next free entry ran off the block see if there's a free entry
2122 for (int i = 0; i < b->_number_of_methods; i++) {
2123 if (b->_methods[i] == _free_method) {
2124 b->_methods[i] = m;
2125 _last_free = b;
2126 return &(b->_methods[i]);
2127 }
2128 }
2129 // Only check each block once for frees. They're very unlikely.
2130 // Increment top past the end of the block.
2131 b->_top++;
2132 }
2133 // need to allocate a next block.
2134 if (b->_next == nullptr) {
2135 b->_next = _last_free = new JNIMethodBlockNode();
2136 }
2137 }
2138 guarantee(false, "Should always allocate a free block");
2139 return nullptr;
2140 }
2141
2142 bool contains(Method** m) {
2143 if (m == nullptr) return false;
2144 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2145 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2146 // This is a bit of extra checking, for two reasons. One is
2147 // that contains() deals with pointers that are passed in by
2148 // JNI code, so making sure that the pointer is aligned
2149 // correctly is valuable. The other is that <= and > are
2150 // technically not defined on pointers, so the if guard can
2151 // pass spuriously; no modern compiler is likely to make that
2152 // a problem, though (and if one did, the guard could also
2153 // fail spuriously, which would be bad).
2154 ptrdiff_t idx = m - b->_methods;
2155 if (b->_methods + idx == m) {
2156 return true;
2157 }
2158 }
2159 }
2160 return false; // not found
2161 }
2162
2163 // During class unloading the methods are cleared, which is different
2164 // than freed.
2165 void clear_all_methods() {
2166 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2167 for (int i = 0; i< b->_number_of_methods; i++) {
2168 b->_methods[i] = nullptr;
2169 }
2170 }
2171 }
2172 #ifndef PRODUCT
2173 int count_methods() {
2174 // count all allocated methods
2175 int count = 0;
2176 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2177 for (int i = 0; i< b->_number_of_methods; i++) {
2178 if (b->_methods[i] != _free_method) count++;
2179 }
2180 }
2181 return count;
2182 }
2183 #endif // PRODUCT
2184 };
2185
2186 // Something that can't be mistaken for an address or a markWord
2187 Method* const JNIMethodBlock::_free_method = (Method*)55;
2188
2189 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2190 _number_of_methods = MAX2(num_methods, min_block_size);
2191 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2192 for (int i = 0; i < _number_of_methods; i++) {
2193 _methods[i] = JNIMethodBlock::_free_method;
2194 }
2195 }
2196
2197 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2198 // Have to add jmethod_ids() to class loader data thread-safely.
2199 // Also have to add the method to the list safely, which the lock
2200 // protects as well.
2201 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2202 if (cld->jmethod_ids() == nullptr) {
2203 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2204 } else {
2205 cld->jmethod_ids()->ensure_methods(capacity);
2206 }
2207 }
2208
2209 // Add a method id to the jmethod_ids
2210 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2211 // Have to add jmethod_ids() to class loader data thread-safely.
2212 // Also have to add the method to the list safely, which the lock
2213 // protects as well.
2214 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2215
2216 ResourceMark rm;
2217 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name());
2218 if (cld->jmethod_ids() == nullptr) {
2219 cld->set_jmethod_ids(new JNIMethodBlock());
2220 }
2221 // jmethodID is a pointer to Method*
2222 return (jmethodID)cld->jmethod_ids()->add_method(m);
2223 }
2224
2225 jmethodID Method::jmethod_id() {
2226 methodHandle mh(Thread::current(), this);
2227 return method_holder()->get_jmethod_id(mh);
2228 }
2229
2230 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2231 // Can't assert the method_holder is the same because the new method has the
2232 // scratch method holder.
2233 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2234 == new_method->method_holder()->class_loader() ||
2235 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2236 "changing to a different class loader");
2237 // Just change the method in place, jmethodID pointer doesn't change.
2238 *((Method**)jmid) = new_method;
2239 }
2240
2241 bool Method::is_method_id(jmethodID mid) {
2242 Method* m = resolve_jmethod_id(mid);
2243 assert(m != nullptr, "should be called with non-null method");
2244 InstanceKlass* ik = m->method_holder();
2245 ClassLoaderData* cld = ik->class_loader_data();
2246 if (cld->jmethod_ids() == nullptr) return false;
2247 return (cld->jmethod_ids()->contains((Method**)mid));
2248 }
2249
2250 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2251 if (mid == nullptr) return nullptr;
2252 Method* o = resolve_jmethod_id(mid);
2253 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2254 return nullptr;
2255 }
2256 // Method should otherwise be valid. Assert for testing.
2257 assert(is_valid_method(o), "should be valid jmethodid");
2258 // If the method's class holder object is unreferenced, but not yet marked as
2259 // unloaded, we need to return null here too because after a safepoint, its memory
2260 // will be reclaimed.
2261 return o->method_holder()->is_loader_alive() ? o : nullptr;
2262 };
2263
2264 void Method::set_on_stack(const bool value) {
2265 // Set both the method itself and its constant pool. The constant pool
2266 // on stack means some method referring to it is also on the stack.
2267 constants()->set_on_stack(value);
2268
2269 bool already_set = on_stack_flag();
2270 set_on_stack_flag(value);
2271 if (value && !already_set) {
2272 MetadataOnStackMark::record(this);
2273 }
2274 }
2275
2276 void Method::record_gc_epoch() {
2277 // If any method is on the stack in continuations, none of them can be reclaimed,
2278 // so save the marking cycle to check for the whole class in the cpCache.
2279 // The cpCache is writeable.
2280 constants()->cache()->record_gc_epoch();
2281 }
2282
2283 // Called when the class loader is unloaded to make all methods weak.
2284 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2285 loader_data->jmethod_ids()->clear_all_methods();
2286 }
2287
2288 void Method::clear_jmethod_id() {
2289 // Being at a safepoint prevents racing against other class redefinitions
2290 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2291 // The jmethodID is not stored in the Method instance, we need to look it up first
2292 jmethodID methodid = find_jmethod_id_or_null();
2293 // We need to make sure that jmethodID actually resolves to this method
2294 // - multiple redefined versions may share jmethodID slots and if a method
2295 // has already been rewired to a newer version we could be removing reference
2296 // to a still existing method instance
2297 if (methodid != nullptr && *((Method**)methodid) == this) {
2298 *((Method**)methodid) = nullptr;
2299 }
2300 }
2301
2302 bool Method::has_method_vptr(const void* ptr) {
2303 Method m;
2304 // This assumes that the vtbl pointer is the first word of a C++ object.
2305 return dereference_vptr(&m) == dereference_vptr(ptr);
2306 }
2307
2308 // Check that this pointer is valid by checking that the vtbl pointer matches
2309 bool Method::is_valid_method(const Method* m) {
2310 if (m == nullptr) {
2311 return false;
2312 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2313 // Quick sanity check on pointer.
2314 return false;
2315 } else if (!os::is_readable_range(m, m + 1)) {
2316 return false;
2317 } else if (m->is_shared()) {
2318 return CppVtables::is_valid_shared_method(m);
2319 } else if (Metaspace::contains_non_shared(m)) {
2320 return has_method_vptr((const void*)m);
2321 } else {
2322 return false;
2323 }
2324 }
2325
2326 #ifndef PRODUCT
2327 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2328 out->print("%d", loader_data->jmethod_ids()->count_methods());
2329 }
2330 #endif // PRODUCT
2331
2332
2333 // Printing
2334
2335 #ifndef PRODUCT
2336
2337 void Method::print_on(outputStream* st) const {
2338 ResourceMark rm;
2339 assert(is_method(), "must be method");
2340 st->print_cr("%s", internal_name());
2341 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2342 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2343 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2344 constants()->print_value_on(st); st->cr();
2345 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr();
2346 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2347 st->print (" - name: "); name()->print_value_on(st); st->cr();
2348 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2349 st->print_cr(" - max stack: %d", max_stack());
2350 st->print_cr(" - max locals: %d", max_locals());
2351 st->print_cr(" - size of params: %d", size_of_parameters());
2352 st->print_cr(" - method size: %d", method_size());
2353 if (intrinsic_id() != vmIntrinsics::_none)
2354 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2355 if (highest_comp_level() != CompLevel_none)
2356 st->print_cr(" - highest level: %d", highest_comp_level());
2357 st->print_cr(" - vtable index: %d", _vtable_index);
2358 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2359 st->print( " - adapters: ");
2360 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2361 if (a == nullptr)
2362 st->print_cr(PTR_FORMAT, p2i(a));
2363 else
2364 a->print_adapter_on(st);
2365 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2366 st->print_cr(" - code size: %d", code_size());
2367 if (code_size() != 0) {
2368 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2369 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2370 }
2371 if (method_data() != nullptr) {
2372 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2373 }
2374 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2375 if (checked_exceptions_length() > 0) {
2376 CheckedExceptionElement* table = checked_exceptions_start();
2377 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2378 if (Verbose) {
2379 for (int i = 0; i < checked_exceptions_length(); i++) {
2380 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2381 }
2382 }
2383 }
2384 if (has_linenumber_table()) {
2385 u_char* table = compressed_linenumber_table();
2386 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2387 if (Verbose) {
2388 CompressedLineNumberReadStream stream(table);
2389 while (stream.read_pair()) {
2390 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2391 }
2392 }
2393 }
2394 st->print_cr(" - localvar length: %d", localvariable_table_length());
2395 if (localvariable_table_length() > 0) {
2396 LocalVariableTableElement* table = localvariable_table_start();
2397 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2398 if (Verbose) {
2399 for (int i = 0; i < localvariable_table_length(); i++) {
2400 int bci = table[i].start_bci;
2401 int len = table[i].length;
2402 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2403 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2404 int slot = table[i].slot;
2405 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2406 }
2407 }
2408 }
2409 if (code() != nullptr) {
2410 st->print (" - compiled code: ");
2411 code()->print_value_on(st);
2412 }
2413 if (is_native()) {
2414 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2415 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2416 }
2417 }
2418
2419 void Method::print_linkage_flags(outputStream* st) {
2420 access_flags().print_on(st);
2421 if (is_default_method()) {
2422 st->print("default ");
2423 }
2424 if (is_overpass()) {
2425 st->print("overpass ");
2426 }
2427 }
2428 #endif //PRODUCT
2429
2430 void Method::print_value_on(outputStream* st) const {
2431 assert(is_method(), "must be method");
2432 st->print("%s", internal_name());
2433 print_address_on(st);
2434 st->print(" ");
2435 name()->print_value_on(st);
2436 st->print(" ");
2437 signature()->print_value_on(st);
2438 st->print(" in ");
2439 method_holder()->print_value_on(st);
2440 if (WizardMode) st->print("#%d", _vtable_index);
2441 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2442 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2443 }
2444
2445 // Verification
2446
2447 void Method::verify_on(outputStream* st) {
2448 guarantee(is_method(), "object must be method");
2449 guarantee(constants()->is_constantPool(), "should be constant pool");
2450 MethodData* md = method_data();
2451 guarantee(md == nullptr ||
2452 md->is_methodData(), "should be method data");
2453 }