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
127 NOT_PRODUCT(set_compiled_invocation_count(0);)
128 // Name is very useful for debugging.
129 NOT_PRODUCT(_name = name;)
130 }
131
132 // Release Method*. The nmethod will be gone when we get here because
133 // we've walked the code cache.
134 void Method::deallocate_contents(ClassLoaderData* loader_data) {
135 MetadataFactory::free_metadata(loader_data, constMethod());
136 set_constMethod(nullptr);
137 MetadataFactory::free_metadata(loader_data, method_data());
138 clear_method_data();
139 MetadataFactory::free_metadata(loader_data, method_counters());
140 clear_method_counters();
141 set_adapter_entry(nullptr);
142 // The nmethod will be gone when we get here.
143 if (code() != nullptr) _code = nullptr;
144 }
145
146 void Method::release_C_heap_structures() {
147 if (method_data()) {
148 method_data()->release_C_heap_structures();
149
150 // Destroy MethodData embedded lock
151 method_data()->~MethodData();
152 }
153 }
154
155 address Method::get_i2c_entry() {
156 if (is_abstract()) {
157 return SharedRuntime::throw_AbstractMethodError_entry();
158 }
159 assert(adapter() != nullptr, "must have");
160 return adapter()->get_i2c_entry();
161 }
162
163 address Method::get_c2i_entry() {
164 if (is_abstract()) {
165 return SharedRuntime::get_handle_wrong_method_abstract_stub();
166 }
167 assert(adapter() != nullptr, "must have");
168 return adapter()->get_c2i_entry();
169 }
170
171 address Method::get_c2i_inline_entry() {
172 if (is_abstract()) {
173 return SharedRuntime::get_handle_wrong_method_abstract_stub();
174 }
175 assert(adapter() != nullptr, "must have");
176 return adapter()->get_c2i_inline_entry();
177 }
178
179 address Method::get_c2i_inline_ro_entry() {
180 if (is_abstract()) {
181 return SharedRuntime::get_handle_wrong_method_abstract_stub();
182 }
183 assert(adapter() != nullptr, "must have");
184 return adapter()->get_c2i_inline_ro_entry();
185 }
186
187 address Method::get_c2i_unverified_entry() {
188 if (is_abstract()) {
189 return SharedRuntime::get_handle_wrong_method_abstract_stub();
190 }
191 assert(adapter() != nullptr, "must have");
192 return adapter()->get_c2i_unverified_entry();
193 }
194
195 address Method::get_c2i_unverified_inline_entry() {
196 assert(adapter() != nullptr, "must have");
197 return adapter()->get_c2i_unverified_inline_entry();
198 }
199
200 address Method::get_c2i_no_clinit_check_entry() {
201 if (is_abstract()) {
202 return nullptr;
203 }
204 assert(VM_Version::supports_fast_class_init_checks(), "");
205 assert(adapter() != nullptr, "must have");
206 return adapter()->get_c2i_no_clinit_check_entry();
207 }
208
209 char* Method::name_and_sig_as_C_string(bool use_double_colon) const {
210 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), use_double_colon);
211 }
212
213 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
214 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
215 }
216
217 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, bool use_double_colon) {
218 const char* klass_name = klass->external_name();
219 int klass_name_len = (int)strlen(klass_name);
220 int method_name_len = method_name->utf8_length();
221 int separator_len = use_double_colon ? 2 : 1;
222 int len = klass_name_len + separator_len + method_name_len + signature->utf8_length();
223 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
224 strcpy(dest, klass_name);
225 if (use_double_colon) {
226 dest[klass_name_len + 0] = ':';
227 dest[klass_name_len + 1] = ':';
228 } else {
229 dest[klass_name_len] = '.';
230 }
231 strcpy(&dest[klass_name_len + separator_len], method_name->as_C_string());
232 strcpy(&dest[klass_name_len + separator_len + method_name_len], signature->as_C_string());
233 dest[len] = 0;
234 return dest;
235 }
236
237 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
238 Symbol* klass_name = klass->name();
239 klass_name->as_klass_external_name(buf, size);
240 int len = (int)strlen(buf);
241
242 if (len < size - 1) {
243 buf[len++] = '.';
244
245 method_name->as_C_string(&(buf[len]), size - len);
246 len = (int)strlen(buf);
247
248 signature->as_C_string(&(buf[len]), size - len);
249 }
250
251 return buf;
252 }
253
254 const char* Method::external_name() const {
255 return external_name(constants()->pool_holder(), name(), signature());
256 }
257
258 void Method::print_external_name(outputStream *os) const {
259 print_external_name(os, constants()->pool_holder(), name(), signature());
260 }
261
262 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
263 stringStream ss;
264 print_external_name(&ss, klass, method_name, signature);
265 return ss.as_string();
266 }
267
268 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
269 signature->print_as_signature_external_return_type(os);
270 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
271 signature->print_as_signature_external_parameters(os);
272 os->print(")");
273 }
274
275 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
276 if (log_is_enabled(Debug, exceptions)) {
277 ResourceMark rm(THREAD);
278 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
279 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
280 }
281 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
282 // access exception table
283 ExceptionTable table(mh());
284 int length = table.length();
285 // iterate through all entries sequentially
286 constantPoolHandle pool(THREAD, mh->constants());
287 for (int i = 0; i < length; i ++) {
288 //reacquire the table in case a GC happened
289 ExceptionTable table(mh());
290 int beg_bci = table.start_pc(i);
291 int end_bci = table.end_pc(i);
292 assert(beg_bci <= end_bci, "inconsistent exception table");
293 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
294 beg_bci, end_bci);
295
296 if (beg_bci <= throw_bci && throw_bci < end_bci) {
297 // exception handler bci range covers throw_bci => investigate further
298 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
299
300 int handler_bci = table.handler_pc(i);
301 int klass_index = table.catch_type_index(i);
302 if (klass_index == 0) {
303 if (log_is_enabled(Info, exceptions)) {
304 ResourceMark rm(THREAD);
305 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
306 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
307 }
308 return handler_bci;
309 } else if (ex_klass == nullptr) {
310 // Is this even possible?
311 if (log_is_enabled(Info, exceptions)) {
312 ResourceMark rm(THREAD);
313 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
314 mh()->name()->as_C_string(), handler_bci);
315 }
316 return handler_bci;
317 } else {
318 if (log_is_enabled(Debug, exceptions)) {
319 ResourceMark rm(THREAD);
320 log_debug(exceptions)(" - resolving catch type \"%s\"",
321 pool->klass_name_at(klass_index)->as_C_string());
322 }
323 // we know the exception class => get the constraint class
324 // this may require loading of the constraint class; if verification
325 // fails or some other exception occurs, return handler_bci
326 Klass* k = pool->klass_at(klass_index, THREAD);
327 if (HAS_PENDING_EXCEPTION) {
328 if (log_is_enabled(Debug, exceptions)) {
329 ResourceMark rm(THREAD);
330 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
331 PENDING_EXCEPTION->klass()->external_name());
332 }
333 return handler_bci;
334 }
335 assert(k != nullptr, "klass not loaded");
336 if (ex_klass->is_subtype_of(k)) {
337 if (log_is_enabled(Info, exceptions)) {
338 ResourceMark rm(THREAD);
339 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
340 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
341 }
342 return handler_bci;
343 }
344 }
345 }
346 }
347
348 if (log_is_enabled(Debug, exceptions)) {
349 ResourceMark rm(THREAD);
350 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
351 ex_klass->external_name(), mh->name()->as_C_string());
352 }
353
354 return -1;
355 }
356
357 void Method::mask_for(int bci, InterpreterOopMap* mask) {
358 methodHandle h_this(Thread::current(), this);
359 mask_for(h_this, bci, mask);
360 }
361
362 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
363 assert(this_mh() == this, "Sanity");
364 method_holder()->mask_for(this_mh, bci, mask);
365 }
366
367 int Method::bci_from(address bcp) const {
368 if (is_native() && bcp == nullptr) {
369 return 0;
370 }
371 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
372 // may call this after interrupting a nested ResourceMark.
373 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
374 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
375
376 return int(bcp - code_base());
377 }
378
379
380 int Method::validate_bci(int bci) const {
381 // Called from the verifier, and should return -1 if not valid.
382 return ((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size())) ? bci : -1;
383 }
384
385 // Return bci if it appears to be a valid bcp
386 // Return -1 otherwise.
387 // Used by profiling code, when invalid data is a possibility.
388 // The caller is responsible for validating the Method* itself.
389 int Method::validate_bci_from_bcp(address bcp) const {
390 // keep bci as -1 if not a valid bci
391 int bci = -1;
392 if (bcp == nullptr || bcp == code_base()) {
393 // code_size() may return 0 and we allow 0 here
394 // the method may be native
395 bci = 0;
396 } else if (contains(bcp)) {
397 bci = int(bcp - code_base());
398 }
399 // Assert that if we have dodged any asserts, bci is negative.
400 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
401 return bci;
402 }
403
404 address Method::bcp_from(int bci) const {
405 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
406 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
407 address bcp = code_base() + bci;
408 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
409 return bcp;
410 }
411
412 address Method::bcp_from(address bcp) const {
413 if (is_native() && bcp == nullptr) {
414 return code_base();
415 } else {
416 return bcp;
417 }
418 }
419
420 int Method::size(bool is_native) {
421 // If native, then include pointers for native_function and signature_handler
422 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
423 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
424 return align_metadata_size(header_size() + extra_words);
425 }
426
427 Symbol* Method::klass_name() const {
428 return method_holder()->name();
429 }
430
431 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
432 log_trace(aot)("Iter(Method): %p", this);
433
434 if (!method_holder()->is_rewritten() || Arguments::is_valhalla_enabled()) {
435 it->push(&_constMethod, MetaspaceClosure::_writable);
436 } else {
437 it->push(&_constMethod);
438 }
439 it->push(&_adapter);
440 it->push(&_method_data);
441 it->push(&_method_counters);
442 NOT_PRODUCT(it->push(&_name);)
443 }
444
445 #if INCLUDE_CDS
446 // Attempt to return method to original state. Clear any pointers
447 // (to objects outside the shared spaces). We won't be able to predict
448 // where they should point in a new JVM. Further initialize some
449 // entries now in order allow them to be write protected later.
450
451 void Method::remove_unshareable_info() {
452 unlink_method();
453 if (method_data() != nullptr) {
454 method_data()->remove_unshareable_info();
455 }
456 if (method_counters() != nullptr) {
457 method_counters()->remove_unshareable_info();
458 }
459 if (CDSConfig::is_dumping_adapters() && _adapter != nullptr) {
460 _adapter->remove_unshareable_info();
461 _adapter = nullptr;
462 }
463 JFR_ONLY(REMOVE_METHOD_ID(this);)
464 }
465
466 void Method::restore_unshareable_info(TRAPS) {
467 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
468 if (method_data() != nullptr) {
469 method_data()->restore_unshareable_info(CHECK);
470 }
471 if (method_counters() != nullptr) {
472 method_counters()->restore_unshareable_info(CHECK);
473 }
474 if (_adapter != nullptr) {
475 assert(_adapter->is_linked(), "must be");
476 _from_compiled_entry = _adapter->get_c2i_entry();
477 _from_compiled_inline_entry = _adapter->get_c2i_inline_entry();
478 _from_compiled_inline_ro_entry = _adapter->get_c2i_inline_ro_entry();
479 }
480 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
481 }
482 #endif
483
484 void Method::set_vtable_index(int index) {
485 if (in_aot_cache() && !AOTMetaspace::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
486 // At runtime initialize_vtable is rerun as part of link_class_impl()
487 // for a shared class loaded by the non-boot loader to obtain the loader
488 // constraints based on the runtime classloaders' context.
489 return; // don't write into the shared class
490 } else {
491 _vtable_index = index;
492 }
493 }
494
495 void Method::set_itable_index(int index) {
496 if (in_aot_cache() && !AOTMetaspace::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
497 // At runtime initialize_itable is rerun as part of link_class_impl()
498 // for a shared class loaded by the non-boot loader to obtain the loader
499 // constraints based on the runtime classloaders' context. The dumptime
500 // itable index should be the same as the runtime index.
501 assert(_vtable_index == itable_index_max - index,
502 "archived itable index is different from runtime index");
503 return; // don't write into the shared class
504 } else {
505 _vtable_index = itable_index_max - index;
506 }
507 assert(valid_itable_index(), "");
508 }
509
510 // The RegisterNatives call being attempted tried to register with a method that
511 // is not native. Ask JVM TI what prefixes have been specified. Then check
512 // to see if the native method is now wrapped with the prefixes. See the
513 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
514 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
515 #if INCLUDE_JVMTI
516 ResourceMark rm(THREAD);
517 Method* method;
518 int name_len = name->utf8_length();
519 char* name_str = name->as_utf8();
520 int prefix_count;
521 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
522 for (int i = 0; i < prefix_count; i++) {
523 char* prefix = prefixes[i];
524 int prefix_len = (int)strlen(prefix);
525
526 // try adding this prefix to the method name and see if it matches another method name
527 int trial_len = name_len + prefix_len;
528 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
529 strcpy(trial_name_str, prefix);
530 strcat(trial_name_str, name_str);
531 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
532 if (trial_name == nullptr) {
533 continue; // no such symbol, so this prefix wasn't used, try the next prefix
534 }
535 method = k->lookup_method(trial_name, signature);
536 if (method == nullptr) {
537 continue; // signature doesn't match, try the next prefix
538 }
539 if (method->is_native()) {
540 method->set_is_prefixed_native();
541 return method; // wahoo, we found a prefixed version of the method, return it
542 }
543 // found as non-native, so prefix is good, add it, probably just need more prefixes
544 name_len = trial_len;
545 name_str = trial_name_str;
546 }
547 #endif // INCLUDE_JVMTI
548 return nullptr; // not found
549 }
550
551 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
552 Method* method = k->lookup_method(name, signature);
553 if (method == nullptr) {
554 ResourceMark rm(THREAD);
555 stringStream st;
556 st.print("Method '");
557 print_external_name(&st, k, name, signature);
558 st.print("' name or signature does not match");
559 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
560 }
561 if (!method->is_native()) {
562 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
563 method = find_prefixed_native(k, name, signature, THREAD);
564 if (method == nullptr) {
565 ResourceMark rm(THREAD);
566 stringStream st;
567 st.print("Method '");
568 print_external_name(&st, k, name, signature);
569 st.print("' is not declared as native");
570 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
571 }
572 }
573
574 if (entry != nullptr) {
575 method->set_native_function(entry, native_bind_event_is_interesting);
576 } else {
577 method->clear_native_function();
578 }
579 if (log_is_enabled(Debug, jni, resolve)) {
580 ResourceMark rm(THREAD);
581 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
582 method->method_holder()->external_name(),
583 method->name()->as_C_string());
584 }
585 return true;
586 }
587
588 bool Method::was_executed_more_than(int n) {
589 // Invocation counter is reset when the Method* is compiled.
590 // If the method has compiled code we therefore assume it has
591 // be executed more than n times.
592 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
593 // interpreter doesn't bump invocation counter of trivial methods
594 // compiler does not bump invocation counter of compiled methods
595 return true;
596 }
597 else if ((method_counters() != nullptr &&
598 method_counters()->invocation_counter()->carry()) ||
599 (method_data() != nullptr &&
600 method_data()->invocation_counter()->carry())) {
601 // The carry bit is set when the counter overflows and causes
602 // a compilation to occur. We don't know how many times
603 // the counter has been reset, so we simply assume it has
604 // been executed more than n times.
605 return true;
606 } else {
607 return invocation_count() > n;
608 }
609 }
610
611 void Method::print_invocation_count(outputStream* st) {
612 //---< compose+print method return type, klass, name, and signature >---
613 if (is_static()) { st->print("static "); }
614 if (is_final()) { st->print("final "); }
615 if (is_synchronized()) { st->print("synchronized "); }
616 if (is_native()) { st->print("native "); }
617 st->print("%s::", method_holder()->external_name());
618 name()->print_symbol_on(st);
619 signature()->print_symbol_on(st);
620
621 if (WizardMode) {
622 // dump the size of the byte codes
623 st->print(" {%d}", code_size());
624 }
625 st->cr();
626
627 // Counting based on signed int counters tends to overflow with
628 // longer-running workloads on fast machines. The counters under
629 // consideration here, however, are limited in range by counting
630 // logic. See InvocationCounter:count_limit for example.
631 // No "overflow precautions" need to be implemented here.
632 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
633 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
634 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
635
636 if (method_data() != nullptr) {
637 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
638 }
639
640 #ifndef PRODUCT
641 if (CountCompiledCalls) {
642 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
643 }
644 #endif
645 }
646
647 MethodTrainingData* Method::training_data_or_null() const {
648 MethodCounters* mcs = method_counters();
649 if (mcs == nullptr) {
650 return nullptr;
651 } else {
652 MethodTrainingData* mtd = mcs->method_training_data();
653 if (mtd == mcs->method_training_data_sentinel()) {
654 return nullptr;
655 }
656 return mtd;
657 }
658 }
659
660 bool Method::init_training_data(MethodTrainingData* td) {
661 MethodCounters* mcs = method_counters();
662 if (mcs == nullptr) {
663 return false;
664 } else {
665 return mcs->init_method_training_data(td);
666 }
667 }
668
669 bool Method::install_training_method_data(const methodHandle& method) {
670 MethodTrainingData* mtd = MethodTrainingData::find(method);
671 if (mtd != nullptr && mtd->final_profile() != nullptr) {
672 AtomicAccess::replace_if_null(&method->_method_data, mtd->final_profile());
673 return true;
674 }
675 return false;
676 }
677
678 // Build a MethodData* object to hold profiling information collected on this
679 // method when requested.
680 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
681 if (install_training_method_data(method)) {
682 return;
683 }
684 // Do not profile the method if metaspace has hit an OOM previously
685 // allocating profiling data. Callers clear pending exception so don't
686 // add one here.
687 if (ClassLoaderDataGraph::has_metaspace_oom()) {
688 return;
689 }
690
691 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
692 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
693 if (HAS_PENDING_EXCEPTION) {
694 CompileBroker::log_metaspace_failure();
695 ClassLoaderDataGraph::set_metaspace_oom(true);
696 return; // return the exception (which is cleared)
697 }
698
699 if (!AtomicAccess::replace_if_null(&method->_method_data, method_data)) {
700 MetadataFactory::free_metadata(loader_data, method_data);
701 return;
702 }
703
704 if (PrintMethodData && (Verbose || WizardMode)) {
705 ResourceMark rm(THREAD);
706 tty->print("build_profiling_method_data for ");
707 method->print_name(tty);
708 tty->cr();
709 // At the end of the run, the MDO, full of data, will be dumped.
710 }
711 }
712
713 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
714 // Do not profile the method if metaspace has hit an OOM previously
715 if (ClassLoaderDataGraph::has_metaspace_oom()) {
716 return nullptr;
717 }
718
719 methodHandle mh(current, m);
720 MethodCounters* counters;
721 if (current->is_Java_thread()) {
722 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
723 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
724 // if needed.
725 counters = MethodCounters::allocate_with_exception(mh, THREAD);
726 if (HAS_PENDING_EXCEPTION) {
727 CLEAR_PENDING_EXCEPTION;
728 }
729 } else {
730 // Call metaspace allocation that doesn't throw exception if the
731 // current thread isn't a JavaThread, ie. the VMThread.
732 counters = MethodCounters::allocate_no_exception(mh);
733 }
734
735 if (counters == nullptr) {
736 CompileBroker::log_metaspace_failure();
737 ClassLoaderDataGraph::set_metaspace_oom(true);
738 return nullptr;
739 }
740
741 if (!mh->init_method_counters(counters)) {
742 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
743 }
744
745 return mh->method_counters();
746 }
747
748 bool Method::init_method_counters(MethodCounters* counters) {
749 // Try to install a pointer to MethodCounters, return true on success.
750 return AtomicAccess::replace_if_null(&_method_counters, counters);
751 }
752
753 void Method::set_exception_handler_entered(int handler_bci) {
754 if (ProfileExceptionHandlers) {
755 MethodData* mdo = method_data();
756 if (mdo != nullptr) {
757 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
758 handler_data.set_exception_handler_entered();
759 }
760 }
761 }
762
763 int Method::extra_stack_words() {
764 // not an inline function, to avoid a header dependency on Interpreter
765 return extra_stack_entries() * Interpreter::stackElementSize;
766 }
767
768 // InlineKlass the method is declared to return. This must not
769 // safepoint as it is called with references live on the stack at
770 // locations the GC is unaware of.
771 InlineKlass* Method::returns_inline_type() const {
772 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
773 if (is_native()) {
774 return nullptr;
775 }
776 NoSafepointVerifier nsv;
777 SignatureStream ss(signature());
778 ss.skip_to_return_type();
779 return ss.as_inline_klass(method_holder());
780 }
781
782 bool Method::compute_has_loops_flag() {
783 BytecodeStream bcs(methodHandle(Thread::current(), this));
784 Bytecodes::Code bc;
785
786 while ((bc = bcs.next()) >= 0) {
787 switch (bc) {
788 case Bytecodes::_ifeq:
789 case Bytecodes::_ifnull:
790 case Bytecodes::_iflt:
791 case Bytecodes::_ifle:
792 case Bytecodes::_ifne:
793 case Bytecodes::_ifnonnull:
794 case Bytecodes::_ifgt:
795 case Bytecodes::_ifge:
796 case Bytecodes::_if_icmpeq:
797 case Bytecodes::_if_icmpne:
798 case Bytecodes::_if_icmplt:
799 case Bytecodes::_if_icmpgt:
800 case Bytecodes::_if_icmple:
801 case Bytecodes::_if_icmpge:
802 case Bytecodes::_if_acmpeq:
803 case Bytecodes::_if_acmpne:
804 case Bytecodes::_goto:
805 case Bytecodes::_jsr:
806 if (bcs.dest() < bcs.next_bci()) {
807 return set_has_loops();
808 }
809 break;
810
811 case Bytecodes::_goto_w:
812 case Bytecodes::_jsr_w:
813 if (bcs.dest_w() < bcs.next_bci()) {
814 return set_has_loops();
815 }
816 break;
817
818 case Bytecodes::_lookupswitch: {
819 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
820 if (lookupswitch.default_offset() < 0) {
821 return set_has_loops();
822 } else {
823 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
824 LookupswitchPair pair = lookupswitch.pair_at(i);
825 if (pair.offset() < 0) {
826 return set_has_loops();
827 }
828 }
829 }
830 break;
831 }
832 case Bytecodes::_tableswitch: {
833 Bytecode_tableswitch tableswitch(this, bcs.bcp());
834 if (tableswitch.default_offset() < 0) {
835 return set_has_loops();
836 } else {
837 for (int i = 0; i < tableswitch.length(); ++i) {
838 if (tableswitch.dest_offset_at(i) < 0) {
839 return set_has_loops();
840 }
841 }
842 }
843 break;
844 }
845 default:
846 break;
847 }
848 }
849
850 _flags.set_has_loops_flag_init(true);
851 return false;
852 }
853
854 bool Method::is_final_method(AccessFlags class_access_flags) const {
855 // or "does_not_require_vtable_entry"
856 // default method or overpass can occur, is not final (reuses vtable entry)
857 // private methods in classes get vtable entries for backward class compatibility.
858 if (is_overpass() || is_default_method()) return false;
859 return is_final() || class_access_flags.is_final();
860 }
861
862 bool Method::is_final_method() const {
863 return is_final_method(method_holder()->access_flags());
864 }
865
866 bool Method::is_default_method() const {
867 if (method_holder() != nullptr &&
868 method_holder()->is_interface() &&
869 !is_abstract() && !is_private()) {
870 return true;
871 } else {
872 return false;
873 }
874 }
875
876 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
877 if (is_final_method(class_access_flags)) return true;
878 #ifdef ASSERT
879 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
880 if (class_access_flags.is_interface()) {
881 ResourceMark rm;
882 assert(is_nonv == is_static() || is_nonv == is_private(),
883 "nonvirtual unexpected for non-static, non-private: %s",
884 name_and_sig_as_C_string());
885 }
886 #endif
887 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
888 return vtable_index() == nonvirtual_vtable_index;
889 }
890
891 bool Method::can_be_statically_bound() const {
892 return can_be_statically_bound(method_holder()->access_flags());
893 }
894
895 bool Method::can_be_statically_bound(InstanceKlass* context) const {
896 return (method_holder() == context) && can_be_statically_bound();
897 }
898
899 /**
900 * Returns false if this is one of specially treated methods for
901 * which we have to provide stack trace in throw in compiled code.
902 * Returns true otherwise.
903 */
904 bool Method::can_omit_stack_trace() {
905 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
906 return false; // All methods in sun.invoke.util.ValueConversions
907 }
908 return true;
909 }
910
911 bool Method::is_accessor() const {
912 return is_getter() || is_setter();
913 }
914
915 bool Method::is_getter() const {
916 if (code_size() != 5) return false;
917 if (size_of_parameters() != 1) return false;
918 if (java_code_at(0) != Bytecodes::_aload_0) return false;
919 if (java_code_at(1) != Bytecodes::_getfield) return false;
920 switch (java_code_at(4)) {
921 case Bytecodes::_ireturn:
922 case Bytecodes::_lreturn:
923 case Bytecodes::_freturn:
924 case Bytecodes::_dreturn:
925 case Bytecodes::_areturn:
926 break;
927 default:
928 return false;
929 }
930 if (InlineTypeReturnedAsFields && returns_inline_type() != nullptr) {
931 // Don't treat this as (trivial) getter method because the
932 // inline type could be returned in a scalarized form.
933 return false;
934 }
935 return true;
936 }
937
938 bool Method::is_setter() const {
939 if (code_size() != 6) return false;
940 if (java_code_at(0) != Bytecodes::_aload_0) return false;
941 switch (java_code_at(1)) {
942 case Bytecodes::_iload_1:
943 case Bytecodes::_aload_1:
944 case Bytecodes::_fload_1:
945 if (size_of_parameters() != 2) return false;
946 break;
947 case Bytecodes::_dload_1:
948 case Bytecodes::_lload_1:
949 if (size_of_parameters() != 3) return false;
950 break;
951 default:
952 return false;
953 }
954 if (java_code_at(2) != Bytecodes::_putfield) return false;
955 if (java_code_at(5) != Bytecodes::_return) return false;
956 if (has_scalarized_args()) {
957 // Don't treat this as (trivial) setter method because the
958 // inline type argument should be passed in a scalarized form.
959 return false;
960 }
961 return true;
962 }
963
964 bool Method::is_constant_getter() const {
965 int last_index = code_size() - 1;
966 // Check if the first 1-3 bytecodes are a constant push
967 // and the last bytecode is a return.
968 return (2 <= code_size() && code_size() <= 4 &&
969 Bytecodes::is_const(java_code_at(0)) &&
970 Bytecodes::length_for(java_code_at(0)) == last_index &&
971 Bytecodes::is_return(java_code_at(last_index)) &&
972 !has_scalarized_args());
973 }
974
975 bool Method::is_class_initializer() const {
976 // For classfiles version 51 or greater, ensure that the clinit method is
977 // static. Non-static methods with the name "<clinit>" are not static
978 // initializers. (older classfiles exempted for backward compatibility)
979 return (name() == vmSymbols::class_initializer_name() &&
980 (is_static() ||
981 method_holder()->major_version() < 51));
982 }
983
984 // A method named <init>, is a classic object constructor.
985 bool Method::is_object_constructor() const {
986 return name() == vmSymbols::object_initializer_name();
987 }
988
989 bool Method::needs_clinit_barrier() const {
990 return is_static() && !method_holder()->is_initialized();
991 }
992
993 bool Method::is_object_wait0() const {
994 return klass_name() == vmSymbols::java_lang_Object()
995 && name() == vmSymbols::wait_name();
996 }
997
998 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
999 int length = method->checked_exceptions_length();
1000 if (length == 0) { // common case
1001 return objArrayHandle(THREAD, Universe::the_empty_class_array());
1002 } else {
1003 methodHandle h_this(THREAD, method);
1004 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
1005 objArrayHandle mirrors (THREAD, m_oop);
1006 for (int i = 0; i < length; i++) {
1007 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
1008 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
1009 if (log_is_enabled(Warning, exceptions) &&
1010 !k->is_subclass_of(vmClasses::Throwable_klass())) {
1011 ResourceMark rm(THREAD);
1012 log_warning(exceptions)(
1013 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
1014 k->external_name(), method->external_name());
1015 }
1016 mirrors->obj_at_put(i, k->java_mirror());
1017 }
1018 return mirrors;
1019 }
1020 };
1021
1022
1023 int Method::line_number_from_bci(int bci) const {
1024 int best_bci = 0;
1025 int best_line = -1;
1026 if (bci == SynchronizationEntryBCI) bci = 0;
1027 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
1028 // The line numbers are a short array of 2-tuples [start_pc, line_number].
1029 // Not necessarily sorted and not necessarily one-to-one.
1030 CompressedLineNumberReadStream stream(compressed_linenumber_table());
1031 while (stream.read_pair()) {
1032 if (stream.bci() == bci) {
1033 // perfect match
1034 return stream.line();
1035 } else {
1036 // update best_bci/line
1037 if (stream.bci() < bci && stream.bci() >= best_bci) {
1038 best_bci = stream.bci();
1039 best_line = stream.line();
1040 }
1041 }
1042 }
1043 }
1044 return best_line;
1045 }
1046
1047
1048 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1049 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
1050 Thread *thread = Thread::current();
1051 Symbol* klass_name = constants()->klass_name_at(klass_index);
1052 Handle loader(thread, method_holder()->class_loader());
1053 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr;
1054 } else {
1055 return true;
1056 }
1057 }
1058
1059
1060 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1061 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1062 if (must_be_resolved) {
1063 // Make sure klass is resolved in constantpool.
1064 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
1065 return false;
1066 }
1067 }
1068 return is_klass_loaded_by_klass_index(klass_index);
1069 }
1070
1071
1072 void Method::set_native_function(address function, bool post_event_flag) {
1073 assert(function != nullptr, "use clear_native_function to unregister natives");
1074 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1075 address* native_function = native_function_addr();
1076
1077 // We can see racers trying to place the same native function into place. Once
1078 // is plenty.
1079 address current = *native_function;
1080 if (current == function) return;
1081 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1082 function != nullptr) {
1083 // native_method_throw_unsatisfied_link_error_entry() should only
1084 // be passed when post_event_flag is false.
1085 assert(function !=
1086 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1087 "post_event_flag mismatch");
1088
1089 // post the bind event, and possible change the bind function
1090 JvmtiExport::post_native_method_bind(this, &function);
1091 }
1092 *native_function = function;
1093 // This function can be called more than once. We must make sure that we always
1094 // use the latest registered method -> check if a stub already has been generated.
1095 // If so, we have to make it not_entrant.
1096 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1097 if (nm != nullptr) {
1098 nm->make_not_entrant(nmethod::InvalidationReason::SET_NATIVE_FUNCTION);
1099 }
1100 }
1101
1102
1103 bool Method::has_native_function() const {
1104 if (is_special_native_intrinsic())
1105 return false; // special-cased in SharedRuntime::generate_native_wrapper
1106 address func = native_function();
1107 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1108 }
1109
1110
1111 void Method::clear_native_function() {
1112 // Note: is_method_handle_intrinsic() is allowed here.
1113 set_native_function(
1114 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1115 !native_bind_event_is_interesting);
1116 this->unlink_code();
1117 }
1118
1119
1120 void Method::set_signature_handler(address handler) {
1121 address* signature_handler = signature_handler_addr();
1122 *signature_handler = handler;
1123 }
1124
1125
1126 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1127 assert(reason != nullptr, "must provide a reason");
1128 if (PrintCompilation && report) {
1129 ttyLocker ttyl;
1130 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1131 if (comp_level == CompLevel_all) {
1132 tty->print("all levels ");
1133 } else {
1134 tty->print("level %d ", comp_level);
1135 }
1136 this->print_short_name(tty);
1137 int size = this->code_size();
1138 if (size > 0) {
1139 tty->print(" (%d bytes)", size);
1140 }
1141 if (reason != nullptr) {
1142 tty->print(" %s", reason);
1143 }
1144 tty->cr();
1145 }
1146 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1147 ttyLocker ttyl;
1148 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'",
1149 os::current_thread_id(), is_osr, comp_level);
1150 if (reason != nullptr) {
1151 xtty->print(" reason=\'%s\'", reason);
1152 }
1153 xtty->method(this);
1154 xtty->stamp();
1155 xtty->end_elem();
1156 }
1157 }
1158
1159 bool Method::is_always_compilable() const {
1160 // Generated adapters must be compiled
1161 if (is_special_native_intrinsic() && is_synthetic()) {
1162 assert(!is_not_c1_compilable(), "sanity check");
1163 assert(!is_not_c2_compilable(), "sanity check");
1164 return true;
1165 }
1166
1167 return false;
1168 }
1169
1170 bool Method::is_not_compilable(int comp_level) const {
1171 if (number_of_breakpoints() > 0)
1172 return true;
1173 if (is_always_compilable())
1174 return false;
1175 if (comp_level == CompLevel_any)
1176 return is_not_c1_compilable() && is_not_c2_compilable();
1177 if (is_c1_compile(comp_level))
1178 return is_not_c1_compilable();
1179 if (is_c2_compile(comp_level))
1180 return is_not_c2_compilable();
1181 return false;
1182 }
1183
1184 // call this when compiler finds that this method is not compilable
1185 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1186 if (is_always_compilable()) {
1187 // Don't mark a method which should be always compilable
1188 return;
1189 }
1190 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1191 if (comp_level == CompLevel_all) {
1192 set_is_not_c1_compilable();
1193 set_is_not_c2_compilable();
1194 } else {
1195 if (is_c1_compile(comp_level))
1196 set_is_not_c1_compilable();
1197 if (is_c2_compile(comp_level))
1198 set_is_not_c2_compilable();
1199 }
1200 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1201 }
1202
1203 bool Method::is_not_osr_compilable(int comp_level) const {
1204 if (is_not_compilable(comp_level))
1205 return true;
1206 if (comp_level == CompLevel_any)
1207 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1208 if (is_c1_compile(comp_level))
1209 return is_not_c1_osr_compilable();
1210 if (is_c2_compile(comp_level))
1211 return is_not_c2_osr_compilable();
1212 return false;
1213 }
1214
1215 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1216 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1217 if (comp_level == CompLevel_all) {
1218 set_is_not_c1_osr_compilable();
1219 set_is_not_c2_osr_compilable();
1220 } else {
1221 if (is_c1_compile(comp_level))
1222 set_is_not_c1_osr_compilable();
1223 if (is_c2_compile(comp_level))
1224 set_is_not_c2_osr_compilable();
1225 }
1226 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1227 }
1228
1229 // Revert to using the interpreter and clear out the nmethod
1230 void Method::clear_code() {
1231 // this may be null if c2i adapters have not been made yet
1232 // Only should happen at allocate time.
1233 if (adapter() == nullptr) {
1234 _from_compiled_entry = nullptr;
1235 _from_compiled_inline_entry = nullptr;
1236 _from_compiled_inline_ro_entry = nullptr;
1237 } else {
1238 _from_compiled_entry = adapter()->get_c2i_entry();
1239 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1240 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1241 }
1242 OrderAccess::storestore();
1243 _from_interpreted_entry = _i2i_entry;
1244 OrderAccess::storestore();
1245 _code = nullptr;
1246 }
1247
1248 void Method::unlink_code(nmethod *compare) {
1249 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1250 // We need to check if either the _code or _from_compiled_code_entry_point
1251 // refer to this nmethod because there is a race in setting these two fields
1252 // in Method* as seen in bugid 4947125.
1253 if (code() == compare ||
1254 from_compiled_entry() == compare->verified_entry_point()) {
1255 clear_code();
1256 }
1257 }
1258
1259 void Method::unlink_code() {
1260 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1261 clear_code();
1262 }
1263
1264 #if INCLUDE_CDS
1265 // Called by class data sharing to remove any entry points (which are not shared)
1266 void Method::unlink_method() {
1267 assert(CDSConfig::is_dumping_archive(), "sanity");
1268 _code = nullptr;
1269 if (!CDSConfig::is_dumping_adapters()) {
1270 _adapter = nullptr;
1271 }
1272 _i2i_entry = nullptr;
1273 _from_compiled_entry = nullptr;
1274 _from_compiled_inline_entry = nullptr;
1275 _from_compiled_inline_ro_entry = nullptr;
1276 _from_interpreted_entry = nullptr;
1277
1278 if (is_native()) {
1279 *native_function_addr() = nullptr;
1280 set_signature_handler(nullptr);
1281 }
1282 NOT_PRODUCT(set_compiled_invocation_count(0);)
1283
1284 clear_method_data();
1285 clear_method_counters();
1286 clear_is_not_c1_compilable();
1287 clear_is_not_c1_osr_compilable();
1288 clear_is_not_c2_compilable();
1289 clear_is_not_c2_osr_compilable();
1290 clear_queued_for_compilation();
1291
1292 remove_unshareable_flags();
1293 }
1294
1295 void Method::remove_unshareable_flags() {
1296 // clear all the flags that shouldn't be in the archived version
1297 assert(!is_old(), "must be");
1298 assert(!is_obsolete(), "must be");
1299 assert(!is_deleted(), "must be");
1300
1301 set_is_prefixed_native(false);
1302 set_queued_for_compilation(false);
1303 set_is_not_c2_compilable(false);
1304 set_is_not_c1_compilable(false);
1305 set_is_not_c2_osr_compilable(false);
1306 set_on_stack_flag(false);
1307 set_has_scalarized_args(false);
1308 }
1309 #endif
1310
1311 // Called when the method_holder is getting linked. Setup entrypoints so the method
1312 // is ready to be called from interpreter, compiler, and vtables.
1313 void Method::link_method(const methodHandle& h_method, TRAPS) {
1314 if (log_is_enabled(Info, perf, class, link)) {
1315 ClassLoader::perf_ik_link_methods_count()->inc();
1316 }
1317
1318 // If the code cache is full, we may reenter this function for the
1319 // leftover methods that weren't linked.
1320 if (adapter() != nullptr) {
1321 if (adapter()->in_aot_cache()) {
1322 assert(adapter()->is_linked(), "Adapter is shared but not linked");
1323 } else {
1324 return;
1325 }
1326 }
1327 assert( _code == nullptr, "nothing compiled yet" );
1328
1329 // Setup interpreter entrypoint
1330 assert(this == h_method(), "wrong h_method()" );
1331
1332 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache");
1333 address entry = Interpreter::entry_for_method(h_method);
1334 assert(entry != nullptr, "interpreter entry must be non-null");
1335 // Sets both _i2i_entry and _from_interpreted_entry
1336 set_interpreter_entry(entry);
1337
1338 // Don't overwrite already registered native entries.
1339 if (is_native() && !has_native_function()) {
1340 set_native_function(
1341 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1342 !native_bind_event_is_interesting);
1343 }
1344
1345 // Setup compiler entrypoint. This is made eagerly, so we do not need
1346 // special handling of vtables. An alternative is to make adapters more
1347 // lazily by calling make_adapter() from from_compiled_entry() for the
1348 // normal calls. For vtable calls life gets more complicated. When a
1349 // call-site goes mega-morphic we need adapters in all methods which can be
1350 // called from the vtable. We need adapters on such methods that get loaded
1351 // later. Ditto for mega-morphic itable calls. If this proves to be a
1352 // problem we'll make these lazily later.
1353 // With the scalarized calling convention, create adapters for abstract
1354 // methods as well because the adapter is used to propagate the signature.
1355 if (_adapter == nullptr && (!h_method->is_abstract() || InlineTypePassFieldsAsArgs)) {
1356 make_adapters(h_method, CHECK);
1357 }
1358 h_method->_from_compiled_entry = h_method->get_c2i_entry();
1359 h_method->_from_compiled_inline_entry = h_method->get_c2i_inline_entry();
1360 h_method->_from_compiled_inline_ro_entry = h_method->get_c2i_inline_ro_entry();
1361
1362 // ONLY USE the h_method now as make_adapter may have blocked
1363
1364 if (h_method->is_continuation_native_intrinsic()) {
1365 _from_interpreted_entry = nullptr;
1366 _from_compiled_entry = nullptr;
1367 _i2i_entry = nullptr;
1368 if (Continuations::enabled()) {
1369 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1370 AdapterHandlerLibrary::create_native_wrapper(h_method);
1371 if (!h_method->has_compiled_code()) {
1372 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1373 }
1374 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1375 }
1376 }
1377 }
1378
1379 void Method::make_adapters(const methodHandle& mh, TRAPS) {
1380 assert(!mh->is_abstract() || InlineTypePassFieldsAsArgs, "abstract methods do not have adapters");
1381 PerfTraceTime timer(ClassLoader::perf_method_adapters_time());
1382
1383 // Adapters for compiled code are made eagerly here. They are fairly
1384 // small (generally < 100 bytes) and quick to make (and cached and shared)
1385 // so making them eagerly shouldn't be too expensive.
1386 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1387 if (adapter == nullptr ) {
1388 if (!is_init_completed()) {
1389 // Don't throw exceptions during VM initialization because java.lang.* classes
1390 // might not have been initialized, causing problems when constructing the
1391 // Java exception object.
1392 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1393 } else {
1394 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1395 }
1396 }
1397
1398 assert(!mh->has_scalarized_args() || (adapter->get_sig_cc() != nullptr && adapter->get_sig_cc_ro() != nullptr), "should be initialized");
1399
1400 mh->set_adapter_entry(adapter);
1401 #ifndef ZERO
1402 assert(adapter->is_linked(), "Adapter must have been linked");
1403 #endif
1404 }
1405
1406 // The verified_code_entry() must be called when a invoke is resolved
1407 // on this method.
1408
1409 // It returns the compiled code entry point, after asserting not null.
1410 // This function is called after potential safepoints so that nmethod
1411 // or adapter that it points to is still live and valid.
1412 // This function must not hit a safepoint!
1413 address Method::verified_code_entry() {
1414 DEBUG_ONLY(NoSafepointVerifier nsv;)
1415 assert(_from_compiled_entry != nullptr, "must be set");
1416 return _from_compiled_entry;
1417 }
1418
1419 address Method::verified_inline_code_entry() {
1420 DEBUG_ONLY(NoSafepointVerifier nsv;)
1421 assert(_from_compiled_inline_entry != nullptr, "must be set");
1422 return _from_compiled_inline_entry;
1423 }
1424
1425 address Method::verified_inline_ro_code_entry() {
1426 DEBUG_ONLY(NoSafepointVerifier nsv;)
1427 assert(_from_compiled_inline_ro_entry != nullptr, "must be set");
1428 return _from_compiled_inline_ro_entry;
1429 }
1430
1431 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1432 // (could be racing a deopt).
1433 // Not inline to avoid circular ref.
1434 bool Method::check_code() const {
1435 // cached in a register or local. There's a race on the value of the field.
1436 nmethod *code = AtomicAccess::load_acquire(&_code);
1437 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1438 }
1439
1440 // Install compiled code. Instantly it can execute.
1441 void Method::set_code(const methodHandle& mh, nmethod *code) {
1442 assert_lock_strong(NMethodState_lock);
1443 assert( code, "use clear_code to remove code" );
1444 assert( mh->check_code(), "" );
1445
1446 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1447
1448 // These writes must happen in this order, because the interpreter will
1449 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1450 // which jumps to _from_compiled_entry.
1451 mh->_code = code; // Assign before allowing compiled code to exec
1452
1453 int comp_level = code->comp_level();
1454 // In theory there could be a race here. In practice it is unlikely
1455 // and not worth worrying about.
1456 if (comp_level > mh->highest_comp_level()) {
1457 mh->set_highest_comp_level(comp_level);
1458 }
1459
1460 OrderAccess::storestore();
1461 mh->_from_compiled_entry = code->verified_entry_point();
1462 mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1463 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1464 OrderAccess::storestore();
1465
1466 if (mh->is_continuation_native_intrinsic()) {
1467 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1468
1469 if (mh->is_continuation_enter_intrinsic()) {
1470 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1471 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1472 } else if (mh->is_continuation_yield_intrinsic()) {
1473 mh->_i2i_entry = mh->get_i2c_entry();
1474 } else {
1475 guarantee(false, "Unknown Continuation native intrinsic");
1476 }
1477 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1478 AtomicAccess::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1479 } else if (!mh->is_method_handle_intrinsic()) {
1480 // Instantly compiled code can execute.
1481 mh->_from_interpreted_entry = mh->get_i2c_entry();
1482 }
1483 }
1484
1485
1486 bool Method::is_overridden_in(Klass* k) const {
1487 InstanceKlass* ik = InstanceKlass::cast(k);
1488
1489 if (ik->is_interface()) return false;
1490
1491 // If method is an interface, we skip it - except if it
1492 // is a miranda method
1493 if (method_holder()->is_interface()) {
1494 // Check that method is not a miranda method
1495 if (ik->lookup_method(name(), signature()) == nullptr) {
1496 // No implementation exist - so miranda method
1497 return false;
1498 }
1499 return true;
1500 }
1501
1502 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1503 if (!has_vtable_index()) {
1504 return false;
1505 } else {
1506 Method* vt_m = ik->method_at_vtable(vtable_index());
1507 return vt_m != this;
1508 }
1509 }
1510
1511
1512 // give advice about whether this Method* should be cached or not
1513 bool Method::should_not_be_cached() const {
1514 if (is_old()) {
1515 // This method has been redefined. It is either EMCP or obsolete
1516 // and we don't want to cache it because that would pin the method
1517 // down and prevent it from being collectible if and when it
1518 // finishes executing.
1519 return true;
1520 }
1521
1522 // caching this method should be just fine
1523 return false;
1524 }
1525
1526
1527 /**
1528 * Returns true if this is one of the specially treated methods for
1529 * security related stack walks (like Reflection.getCallerClass).
1530 */
1531 bool Method::is_ignored_by_security_stack_walk() const {
1532 if (intrinsic_id() == vmIntrinsics::_invoke) {
1533 // This is Method.invoke() -- ignore it
1534 return true;
1535 }
1536 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1537 // This is an auxiliary frame -- ignore it
1538 return true;
1539 }
1540 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1541 // This is an internal adapter frame for method handles -- ignore it
1542 return true;
1543 }
1544 return false;
1545 }
1546
1547
1548 // Constant pool structure for invoke methods:
1549 enum {
1550 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1551 _imcp_invoke_signature, // utf8: (variable Symbol*)
1552 _imcp_limit
1553 };
1554
1555 // Test if this method is an MH adapter frame generated by Java code.
1556 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1557 bool Method::is_compiled_lambda_form() const {
1558 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1559 }
1560
1561 // Test if this method is an internal MH primitive method.
1562 bool Method::is_method_handle_intrinsic() const {
1563 vmIntrinsics::ID iid = intrinsic_id();
1564 return (MethodHandles::is_signature_polymorphic(iid) &&
1565 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1566 }
1567
1568 bool Method::has_member_arg() const {
1569 vmIntrinsics::ID iid = intrinsic_id();
1570 return (MethodHandles::is_signature_polymorphic(iid) &&
1571 MethodHandles::has_member_arg(iid));
1572 }
1573
1574 // Make an instance of a signature-polymorphic internal MH primitive.
1575 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1576 Symbol* signature,
1577 TRAPS) {
1578 ResourceMark rm(THREAD);
1579 methodHandle empty;
1580
1581 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1582 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1583 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1584
1585 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1586
1587 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1588 name->increment_refcount();
1589 signature->increment_refcount();
1590
1591 int cp_length = _imcp_limit;
1592 ClassLoaderData* loader_data = holder->class_loader_data();
1593 constantPoolHandle cp;
1594 {
1595 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1596 cp = constantPoolHandle(THREAD, cp_oop);
1597 }
1598 cp->copy_fields(holder->constants());
1599 cp->set_pool_holder(holder);
1600 cp->symbol_at_put(_imcp_invoke_name, name);
1601 cp->symbol_at_put(_imcp_invoke_signature, signature);
1602 cp->set_has_preresolution();
1603 cp->set_is_for_method_handle_intrinsic();
1604
1605 // decide on access bits: public or not?
1606 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1607 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1608 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1609 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1610
1611 methodHandle m;
1612 {
1613 InlineTableSizes sizes;
1614 Method* m_oop = Method::allocate(loader_data, 0,
1615 accessFlags_from(flags_bits), &sizes,
1616 ConstMethod::NORMAL,
1617 name,
1618 CHECK_(empty));
1619 m = methodHandle(THREAD, m_oop);
1620 }
1621 m->set_constants(cp());
1622 m->set_name_index(_imcp_invoke_name);
1623 m->set_signature_index(_imcp_invoke_signature);
1624 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1625 assert(m->signature() == signature, "");
1626 m->constMethod()->compute_from_signature(signature, must_be_static);
1627 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1628 assert(m->is_method_handle_intrinsic(), "");
1629 #ifdef ASSERT
1630 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1631 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1632 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1633 #endif //ASSERT
1634
1635 // Finally, set up its entry points.
1636 assert(m->can_be_statically_bound(), "");
1637 m->set_vtable_index(Method::nonvirtual_vtable_index);
1638 m->link_method(m, CHECK_(empty));
1639
1640 if (iid == vmIntrinsics::_linkToNative) {
1641 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1642 }
1643 if (log_is_enabled(Debug, methodhandles)) {
1644 LogTarget(Debug, methodhandles) lt;
1645 LogStream ls(lt);
1646 m->print_on(&ls);
1647 }
1648
1649 return m;
1650 }
1651
1652 #if INCLUDE_CDS
1653 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1654 if (m->adapter() != nullptr) {
1655 m->set_from_compiled_entry(m->adapter()->get_c2i_entry());
1656 m->set_from_compiled_inline_entry(m->adapter()->get_c2i_inline_entry());
1657 m->set_from_compiled_inline_ro_entry(m->adapter()->get_c2i_inline_ro_entry());
1658 }
1659 m->link_method(m, CHECK);
1660
1661 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1662 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1663 }
1664 }
1665 #endif
1666
1667 Klass* Method::check_non_bcp_klass(Klass* klass) {
1668 if (klass != nullptr && klass->class_loader() != nullptr) {
1669 if (klass->is_objArray_klass())
1670 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1671 return klass;
1672 }
1673 return nullptr;
1674 }
1675
1676
1677 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1678 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1679 // Code below does not work for native methods - they should never get rewritten anyway
1680 assert(!m->is_native(), "cannot rewrite native methods");
1681 // Allocate new Method*
1682 AccessFlags flags = m->access_flags();
1683
1684 ConstMethod* cm = m->constMethod();
1685 int checked_exceptions_len = cm->checked_exceptions_length();
1686 int localvariable_len = cm->localvariable_table_length();
1687 int exception_table_len = cm->exception_table_length();
1688 int method_parameters_len = cm->method_parameters_length();
1689 int method_annotations_len = cm->method_annotations_length();
1690 int parameter_annotations_len = cm->parameter_annotations_length();
1691 int type_annotations_len = cm->type_annotations_length();
1692 int default_annotations_len = cm->default_annotations_length();
1693
1694 InlineTableSizes sizes(
1695 localvariable_len,
1696 new_compressed_linenumber_size,
1697 exception_table_len,
1698 checked_exceptions_len,
1699 method_parameters_len,
1700 cm->generic_signature_index(),
1701 method_annotations_len,
1702 parameter_annotations_len,
1703 type_annotations_len,
1704 default_annotations_len,
1705 0);
1706
1707 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1708 Method* newm_oop = Method::allocate(loader_data,
1709 new_code_length,
1710 flags,
1711 &sizes,
1712 m->method_type(),
1713 m->name(),
1714 CHECK_(methodHandle()));
1715 methodHandle newm (THREAD, newm_oop);
1716
1717 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1718 ConstMethod* newcm = newm->constMethod();
1719 int new_const_method_size = newm->constMethod()->size();
1720
1721 // This works because the source and target are both Methods. Some compilers
1722 // (e.g., clang) complain that the target vtable pointer will be stomped,
1723 // so cast away newm()'s and m()'s Methodness.
1724 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1725
1726 // Create shallow copy of ConstMethod.
1727 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1728
1729 // Reset correct method/const method, method size, and parameter info
1730 newm->set_constMethod(newcm);
1731 newm->constMethod()->set_code_size(new_code_length);
1732 newm->constMethod()->set_constMethod_size(new_const_method_size);
1733 assert(newm->code_size() == new_code_length, "check");
1734 assert(newm->method_parameters_length() == method_parameters_len, "check");
1735 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1736 assert(newm->exception_table_length() == exception_table_len, "check");
1737 assert(newm->localvariable_table_length() == localvariable_len, "check");
1738 // Copy new byte codes
1739 memcpy(newm->code_base(), new_code, new_code_length);
1740 // Copy line number table
1741 if (new_compressed_linenumber_size > 0) {
1742 memcpy(newm->compressed_linenumber_table(),
1743 new_compressed_linenumber_table,
1744 new_compressed_linenumber_size);
1745 }
1746 // Copy method_parameters
1747 if (method_parameters_len > 0) {
1748 memcpy(newm->method_parameters_start(),
1749 m->method_parameters_start(),
1750 method_parameters_len * sizeof(MethodParametersElement));
1751 }
1752 // Copy checked_exceptions
1753 if (checked_exceptions_len > 0) {
1754 memcpy(newm->checked_exceptions_start(),
1755 m->checked_exceptions_start(),
1756 checked_exceptions_len * sizeof(CheckedExceptionElement));
1757 }
1758 // Copy exception table
1759 if (exception_table_len > 0) {
1760 memcpy(newm->exception_table_start(),
1761 m->exception_table_start(),
1762 exception_table_len * sizeof(ExceptionTableElement));
1763 }
1764 // Copy local variable number table
1765 if (localvariable_len > 0) {
1766 memcpy(newm->localvariable_table_start(),
1767 m->localvariable_table_start(),
1768 localvariable_len * sizeof(LocalVariableTableElement));
1769 }
1770 // Copy stackmap table
1771 if (m->has_stackmap_table()) {
1772 int code_attribute_length = m->stackmap_data()->length();
1773 Array<u1>* stackmap_data =
1774 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1775 memcpy((void*)stackmap_data->adr_at(0),
1776 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1777 newm->set_stackmap_data(stackmap_data);
1778 }
1779
1780 // copy annotations over to new method
1781 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1782 return newm;
1783 }
1784
1785 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1786 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1787 // because we are not loading from core libraries
1788 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1789 // which does not use the class default class loader so we check for its loader here
1790 const InstanceKlass* ik = InstanceKlass::cast(holder);
1791 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1792 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1793 }
1794
1795 // see if the klass name is well-known:
1796 Symbol* klass_name = ik->name();
1797 vmSymbolID id = vmSymbols::find_sid(klass_name);
1798 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1799 return id;
1800 } else {
1801 return vmSymbolID::NO_SID;
1802 }
1803 }
1804
1805 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1806 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1807 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1808 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1809 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1810
1811 // the klass name is well-known:
1812 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1813 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1814
1815 // ditto for method and signature:
1816 vmSymbolID name_id = vmSymbols::find_sid(name());
1817 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1818 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1819 && name_id == vmSymbolID::NO_SID) {
1820 return;
1821 }
1822 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1823 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1824 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1825 && sig_id == vmSymbolID::NO_SID) {
1826 return;
1827 }
1828
1829 u2 flags = access_flags().as_method_flags();
1830 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1831 if (id != vmIntrinsics::_none) {
1832 set_intrinsic_id(id);
1833 if (id == vmIntrinsics::_Class_cast) {
1834 // Even if the intrinsic is rejected, we want to inline this simple method.
1835 set_force_inline();
1836 }
1837 return;
1838 }
1839
1840 // A few slightly irregular cases:
1841 switch (klass_id) {
1842 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1843 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1844 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1845 if (!is_native()) break;
1846 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1847 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1848 id = vmIntrinsics::_none;
1849 break;
1850
1851 default:
1852 break;
1853 }
1854
1855 if (id != vmIntrinsics::_none) {
1856 // Set up its iid. It is an alias method.
1857 set_intrinsic_id(id);
1858 return;
1859 }
1860 }
1861
1862 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1863 if (!THREAD->can_call_java()) {
1864 // There is nothing useful this routine can do from within the Compile thread.
1865 // Hopefully, the signature contains only well-known classes.
1866 // We could scan for this and return true/false, but the caller won't care.
1867 return false;
1868 }
1869 bool sig_is_loaded = true;
1870 ResourceMark rm(THREAD);
1871 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1872 if (ss.is_reference()) {
1873 // load everything, including arrays "[Lfoo;"
1874 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1875 // We are loading classes eagerly. If a ClassNotFoundException or
1876 // a LinkageError was generated, be sure to ignore it.
1877 if (HAS_PENDING_EXCEPTION) {
1878 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1879 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1880 CLEAR_PENDING_EXCEPTION;
1881 } else {
1882 return false;
1883 }
1884 }
1885 if( klass == nullptr) { sig_is_loaded = false; }
1886 }
1887 }
1888 return sig_is_loaded;
1889 }
1890
1891 // Exposed so field engineers can debug VM
1892 void Method::print_short_name(outputStream* st) const {
1893 ResourceMark rm;
1894 #ifdef PRODUCT
1895 st->print(" %s::", method_holder()->external_name());
1896 #else
1897 st->print(" %s::", method_holder()->internal_name());
1898 #endif
1899 name()->print_symbol_on(st);
1900 if (WizardMode) signature()->print_symbol_on(st);
1901 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1902 MethodHandles::print_as_basic_type_signature_on(st, signature());
1903 }
1904
1905 // Comparer for sorting an object array containing
1906 // Method*s.
1907 static int method_comparator(Method* a, Method* b) {
1908 return a->name()->fast_compare(b->name());
1909 }
1910
1911 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1912 // default_methods also uses this without the ordering for fast find_method
1913 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1914 int length = methods->length();
1915 if (length > 1) {
1916 if (func == nullptr) {
1917 func = method_comparator;
1918 }
1919 {
1920 NoSafepointVerifier nsv;
1921 QuickSort::sort(methods->data(), length, func);
1922 }
1923 // Reset method ordering
1924 if (set_idnums) {
1925 for (u2 i = 0; i < length; i++) {
1926 Method* m = methods->at(i);
1927 m->set_method_idnum(i);
1928 m->set_orig_method_idnum(i);
1929 }
1930 }
1931 }
1932 }
1933
1934 //-----------------------------------------------------------------------------------
1935 // Non-product code unless JVM/TI needs it
1936
1937 #if !defined(PRODUCT) || INCLUDE_JVMTI
1938 class SignatureTypePrinter : public SignatureTypeNames {
1939 private:
1940 outputStream* _st;
1941 bool _use_separator;
1942
1943 void type_name(const char* name) {
1944 if (_use_separator) _st->print(", ");
1945 _st->print("%s", name);
1946 _use_separator = true;
1947 }
1948
1949 public:
1950 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1951 _st = st;
1952 _use_separator = false;
1953 }
1954
1955 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1956 void print_returntype() { _use_separator = false; do_type(return_type()); }
1957 };
1958
1959
1960 void Method::print_name(outputStream* st) const {
1961 Thread *thread = Thread::current();
1962 ResourceMark rm(thread);
1963 st->print("%s ", is_static() ? "static" : "virtual");
1964 if (WizardMode) {
1965 st->print("%s.", method_holder()->internal_name());
1966 name()->print_symbol_on(st);
1967 signature()->print_symbol_on(st);
1968 } else {
1969 SignatureTypePrinter sig(signature(), st);
1970 sig.print_returntype();
1971 st->print(" %s.", method_holder()->internal_name());
1972 name()->print_symbol_on(st);
1973 st->print("(");
1974 sig.print_parameters();
1975 st->print(")");
1976 }
1977 }
1978 #endif // !PRODUCT || INCLUDE_JVMTI
1979
1980
1981 void Method::print_codes_on(outputStream* st, int flags, bool buffered) const {
1982 print_codes_on(0, code_size(), st, flags, buffered);
1983 }
1984
1985 void Method::print_codes_on(int from, int to, outputStream* st, int flags, bool buffered) const {
1986 Thread *thread = Thread::current();
1987 ResourceMark rm(thread);
1988 methodHandle mh (thread, (Method*)this);
1989 BytecodeTracer::print_method_codes(mh, from, to, st, flags, buffered);
1990 }
1991
1992 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1993 _bci = 0;
1994 _line = 0;
1995 };
1996
1997 bool CompressedLineNumberReadStream::read_pair() {
1998 jubyte next = read_byte();
1999 // Check for terminator
2000 if (next == 0) return false;
2001 if (next == 0xFF) {
2002 // Escape character, regular compression used
2003 _bci += read_signed_int();
2004 _line += read_signed_int();
2005 } else {
2006 // Single byte compression used
2007 _bci += next >> 3;
2008 _line += next & 0x7;
2009 }
2010 return true;
2011 }
2012
2013 #if INCLUDE_JVMTI
2014
2015 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
2016 BreakpointInfo* bp = method_holder()->breakpoints();
2017 for (; bp != nullptr; bp = bp->next()) {
2018 if (bp->match(this, bci)) {
2019 return bp->orig_bytecode();
2020 }
2021 }
2022 {
2023 ResourceMark rm;
2024 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
2025 }
2026 return Bytecodes::_shouldnotreachhere;
2027 }
2028
2029 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
2030 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
2031 BreakpointInfo* bp = method_holder()->breakpoints();
2032 for (; bp != nullptr; bp = bp->next()) {
2033 if (bp->match(this, bci)) {
2034 bp->set_orig_bytecode(code);
2035 // and continue, in case there is more than one
2036 }
2037 }
2038 }
2039
2040 void Method::set_breakpoint(int bci) {
2041 InstanceKlass* ik = method_holder();
2042 BreakpointInfo *bp = new BreakpointInfo(this, bci);
2043 bp->set_next(ik->breakpoints());
2044 ik->set_breakpoints(bp);
2045 // do this last:
2046 bp->set(this);
2047 }
2048
2049 static void clear_matches(Method* m, int bci) {
2050 InstanceKlass* ik = m->method_holder();
2051 BreakpointInfo* prev_bp = nullptr;
2052 BreakpointInfo* next_bp;
2053 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
2054 next_bp = bp->next();
2055 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
2056 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
2057 // do this first:
2058 bp->clear(m);
2059 // unhook it
2060 if (prev_bp != nullptr)
2061 prev_bp->set_next(next_bp);
2062 else
2063 ik->set_breakpoints(next_bp);
2064 delete bp;
2065 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
2066 // at same location. So we have multiple matching (method_index and bci)
2067 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
2068 // breakpoint for clear_breakpoint request and keep all other method versions
2069 // BreakpointInfo for future clear_breakpoint request.
2070 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
2071 // which is being called when class is unloaded. We delete all the Breakpoint
2072 // information for all versions of method. We may not correctly restore the original
2073 // bytecode in all method versions, but that is ok. Because the class is being unloaded
2074 // so these methods won't be used anymore.
2075 if (bci >= 0) {
2076 break;
2077 }
2078 } else {
2079 // This one is a keeper.
2080 prev_bp = bp;
2081 }
2082 }
2083 }
2084
2085 void Method::clear_breakpoint(int bci) {
2086 assert(bci >= 0, "");
2087 clear_matches(this, bci);
2088 }
2089
2090 void Method::clear_all_breakpoints() {
2091 clear_matches(this, -1);
2092 }
2093
2094 #endif // INCLUDE_JVMTI
2095
2096 int Method::highest_osr_comp_level() const {
2097 const MethodCounters* mcs = method_counters();
2098 if (mcs != nullptr) {
2099 return mcs->highest_osr_comp_level();
2100 } else {
2101 return CompLevel_none;
2102 }
2103 }
2104
2105 void Method::set_highest_comp_level(int level) {
2106 MethodCounters* mcs = method_counters();
2107 if (mcs != nullptr) {
2108 mcs->set_highest_comp_level(level);
2109 }
2110 }
2111
2112 void Method::set_highest_osr_comp_level(int level) {
2113 MethodCounters* mcs = method_counters();
2114 if (mcs != nullptr) {
2115 mcs->set_highest_osr_comp_level(level);
2116 }
2117 }
2118
2119 #if INCLUDE_JVMTI
2120
2121 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2122 _bci = bci;
2123 _name_index = m->name_index();
2124 _signature_index = m->signature_index();
2125 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2126 if (_orig_bytecode == Bytecodes::_breakpoint)
2127 _orig_bytecode = m->orig_bytecode_at(_bci);
2128 _next = nullptr;
2129 }
2130
2131 void BreakpointInfo::set(Method* method) {
2132 #ifdef ASSERT
2133 {
2134 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2135 if (code == Bytecodes::_breakpoint)
2136 code = method->orig_bytecode_at(_bci);
2137 assert(orig_bytecode() == code, "original bytecode must be the same");
2138 }
2139 #endif
2140 Thread *thread = Thread::current();
2141 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2142 method->incr_number_of_breakpoints(thread);
2143 {
2144 // Deoptimize all dependents on this method
2145 HandleMark hm(thread);
2146 methodHandle mh(thread, method);
2147 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2148 }
2149 }
2150
2151 void BreakpointInfo::clear(Method* method) {
2152 *method->bcp_from(_bci) = orig_bytecode();
2153 assert(method->number_of_breakpoints() > 0, "must not go negative");
2154 method->decr_number_of_breakpoints(Thread::current());
2155 }
2156
2157 #endif // INCLUDE_JVMTI
2158
2159 // jmethodID handling
2160 // jmethodIDs are 64-bit integers that will never run out and are mapped in a table
2161 // to their Method and vice versa. If JNI code has access to stale jmethodID, this
2162 // wastes no memory but the Method* returned is null.
2163
2164 // Add a method id to the jmethod_ids
2165 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2166 // Have to add jmethod_ids() to class loader data thread-safely.
2167 // Also have to add the method to the InstanceKlass list safely, which the lock
2168 // protects as well.
2169 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2170 jmethodID jmid = JmethodIDTable::make_jmethod_id(m);
2171 assert(jmid != nullptr, "must be created");
2172
2173 // Add to growable array in CLD.
2174 cld->add_jmethod_id(jmid);
2175 return jmid;
2176 }
2177
2178 // This looks in the InstanceKlass cache, then calls back to make_jmethod_id if not found.
2179 jmethodID Method::jmethod_id() {
2180 return method_holder()->get_jmethod_id(this);
2181 }
2182
2183 // Get the Method out of the table given the method id.
2184 Method* Method::resolve_jmethod_id(jmethodID mid) {
2185 assert(mid != nullptr, "JNI method id should not be null");
2186 return JmethodIDTable::resolve_jmethod_id(mid);
2187 }
2188
2189 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2190 // Can't assert the method_holder is the same because the new method has the
2191 // scratch method holder.
2192 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2193 == new_method->method_holder()->class_loader() ||
2194 new_method->method_holder()->class_loader() == nullptr, // allow substitution to Unsafe method
2195 "changing to a different class loader");
2196 JmethodIDTable::change_method_associated_with_jmethod_id(jmid, new_method);
2197 }
2198
2199 // If there's a jmethodID for this method, clear the Method
2200 // but leave jmethodID for this method in the table.
2201 // It's deallocated with class unloading.
2202 void Method::clear_jmethod_id() {
2203 jmethodID mid = method_holder()->jmethod_id_or_null(this);
2204 if (mid != nullptr) {
2205 JmethodIDTable::clear_jmethod_id(mid, this);
2206 }
2207 }
2208
2209 bool Method::validate_jmethod_id(jmethodID mid) {
2210 Method* m = resolve_jmethod_id(mid);
2211 assert(m != nullptr, "should be called with non-null method");
2212 InstanceKlass* ik = m->method_holder();
2213 ClassLoaderData* cld = ik->class_loader_data();
2214 if (cld->jmethod_ids() == nullptr) return false;
2215 return (cld->jmethod_ids()->contains(mid));
2216 }
2217
2218 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2219 if (mid == nullptr) return nullptr;
2220 Method* o = resolve_jmethod_id(mid);
2221 if (o == nullptr) {
2222 return nullptr;
2223 }
2224 // Method should otherwise be valid. Assert for testing.
2225 assert(is_valid_method(o), "should be valid jmethodid");
2226 // If the method's class holder object is unreferenced, but not yet marked as
2227 // unloaded, we need to return null here too because after a safepoint, its memory
2228 // will be reclaimed.
2229 return o->method_holder()->is_loader_alive() ? o : nullptr;
2230 }
2231
2232 void Method::set_on_stack(const bool value) {
2233 // Set both the method itself and its constant pool. The constant pool
2234 // on stack means some method referring to it is also on the stack.
2235 constants()->set_on_stack(value);
2236
2237 bool already_set = on_stack_flag();
2238 set_on_stack_flag(value);
2239 if (value && !already_set) {
2240 MetadataOnStackMark::record(this);
2241 }
2242 }
2243
2244 void Method::record_gc_epoch() {
2245 // If any method is on the stack in continuations, none of them can be reclaimed,
2246 // so save the marking cycle to check for the whole class in the cpCache.
2247 // The cpCache is writeable.
2248 constants()->cache()->record_gc_epoch();
2249 }
2250
2251 bool Method::has_method_vptr(const void* ptr) {
2252 Method m;
2253 // This assumes that the vtbl pointer is the first word of a C++ object.
2254 return dereference_vptr(&m) == dereference_vptr(ptr);
2255 }
2256
2257 // Check that this pointer is valid by checking that the vtbl pointer matches
2258 bool Method::is_valid_method(const Method* m) {
2259 if (m == nullptr) {
2260 return false;
2261 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2262 // Quick sanity check on pointer.
2263 return false;
2264 } else if (!os::is_readable_range(m, m + 1)) {
2265 return false;
2266 } else if (m->in_aot_cache()) {
2267 return CppVtables::is_valid_shared_method(m);
2268 } else if (Metaspace::contains_non_shared(m)) {
2269 return has_method_vptr((const void*)m);
2270 } else {
2271 return false;
2272 }
2273 }
2274
2275 bool Method::is_scalarized_arg(int idx) const {
2276 if (!has_scalarized_args()) {
2277 return false;
2278 }
2279 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID
2280 int depth = 0;
2281 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2282 for (int i = 0; i < sig->length(); i++) {
2283 BasicType bt = sig->at(i)._bt;
2284 if (bt == T_METADATA) {
2285 depth++;
2286 }
2287 if (idx == 0) {
2288 break; // Argument found
2289 }
2290 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2291 depth--;
2292 }
2293 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2294 idx--; // Advance to next argument
2295 }
2296 }
2297 return depth != 0;
2298 }
2299
2300 bool Method::is_scalarized_buffer_arg(int idx) const {
2301 if (!has_scalarized_args()) {
2302 return false;
2303 }
2304 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID
2305 int depth = 0;
2306 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2307 for (int i = 0; i < sig->length(); i++) {
2308 BasicType bt = sig->at(i)._bt;
2309 if (bt == T_METADATA) {
2310 depth++;
2311 continue;
2312 }
2313 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2314 depth--;
2315 continue;
2316 }
2317 if (idx == 0) {
2318 if (sig->at(i)._vt_oop) {
2319 assert(depth == 1, "only for root value");
2320 return true;
2321 }
2322 break; // Argument found
2323 }
2324 idx--; // Advance to next argument
2325 }
2326 return false;
2327 }
2328
2329 // Printing
2330
2331 #ifndef PRODUCT
2332
2333 void Method::print_on(outputStream* st) const {
2334 ResourceMark rm;
2335 assert(is_method(), "must be method");
2336 st->print_cr("%s", internal_name());
2337 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2338 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2339 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2340 constants()->print_value_on(st); st->cr();
2341 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr();
2342 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2343 st->print (" - name: "); name()->print_value_on(st); st->cr();
2344 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2345 st->print_cr(" - max stack: %d", max_stack());
2346 st->print_cr(" - max locals: %d", max_locals());
2347 st->print_cr(" - size of params: %d", size_of_parameters());
2348 st->print_cr(" - method size: %d", method_size());
2349 if (intrinsic_id() != vmIntrinsics::_none)
2350 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2351 if (highest_comp_level() != CompLevel_none)
2352 st->print_cr(" - highest level: %d", highest_comp_level());
2353 st->print_cr(" - vtable index: %d", _vtable_index);
2354 #ifdef ASSERT
2355 if (valid_itable_index())
2356 st->print_cr(" - itable index: %d", itable_index());
2357 #endif
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(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2367 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry()));
2368 st->print_cr(" - code size: %d", code_size());
2369 if (code_size() != 0) {
2370 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2371 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2372 }
2373 if (method_data() != nullptr) {
2374 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2375 }
2376 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2377 if (checked_exceptions_length() > 0) {
2378 CheckedExceptionElement* table = checked_exceptions_start();
2379 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2380 if (Verbose) {
2381 for (int i = 0; i < checked_exceptions_length(); i++) {
2382 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2383 }
2384 }
2385 }
2386 if (has_linenumber_table()) {
2387 u_char* table = compressed_linenumber_table();
2388 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2389 if (Verbose) {
2390 CompressedLineNumberReadStream stream(table);
2391 while (stream.read_pair()) {
2392 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2393 }
2394 }
2395 }
2396 st->print_cr(" - localvar length: %d", localvariable_table_length());
2397 if (localvariable_table_length() > 0) {
2398 LocalVariableTableElement* table = localvariable_table_start();
2399 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2400 if (Verbose) {
2401 for (int i = 0; i < localvariable_table_length(); i++) {
2402 int bci = table[i].start_bci;
2403 int len = table[i].length;
2404 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2405 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2406 int slot = table[i].slot;
2407 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2408 }
2409 }
2410 }
2411 if (code() != nullptr) {
2412 st->print (" - compiled code: ");
2413 code()->print_value_on(st);
2414 }
2415 if (is_native()) {
2416 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2417 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2418 }
2419 }
2420
2421 void Method::print_linkage_flags(outputStream* st) {
2422 access_flags().print_on(st);
2423 if (is_default_method()) {
2424 st->print("default ");
2425 }
2426 if (is_overpass()) {
2427 st->print("overpass ");
2428 }
2429 }
2430 #endif //PRODUCT
2431
2432 void Method::print_value_on(outputStream* st) const {
2433 assert(is_method(), "must be method");
2434 st->print("%s", internal_name());
2435 print_address_on(st);
2436 st->print(" ");
2437 if (WizardMode) access_flags().print_on(st);
2438 name()->print_value_on(st);
2439 st->print(" ");
2440 signature()->print_value_on(st);
2441 st->print(" in ");
2442 method_holder()->print_value_on(st);
2443 if (WizardMode) st->print("#%d", _vtable_index);
2444 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2445 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2446 }
2447
2448 // Verification
2449
2450 void Method::verify_on(outputStream* st) {
2451 guarantee(is_method(), "object must be method");
2452 guarantee(constants()->is_constantPool(), "should be constant pool");
2453 MethodData* md = method_data();
2454 guarantee(md == nullptr ||
2455 md->is_methodData(), "should be method data");
2456 }