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() const {
210 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
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) {
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 len = klass_name_len + 1 + method_name_len + signature->utf8_length();
222 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
223 strcpy(dest, klass_name);
224 dest[klass_name_len] = '.';
225 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
226 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
227 dest[len] = 0;
228 return dest;
229 }
230
231 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
232 Symbol* klass_name = klass->name();
233 klass_name->as_klass_external_name(buf, size);
234 int len = (int)strlen(buf);
235
236 if (len < size - 1) {
237 buf[len++] = '.';
238
239 method_name->as_C_string(&(buf[len]), size - len);
240 len = (int)strlen(buf);
241
242 signature->as_C_string(&(buf[len]), size - len);
243 }
244
245 return buf;
246 }
247
248 const char* Method::external_name() const {
249 return external_name(constants()->pool_holder(), name(), signature());
250 }
251
252 void Method::print_external_name(outputStream *os) const {
253 print_external_name(os, constants()->pool_holder(), name(), signature());
254 }
255
256 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
257 stringStream ss;
258 print_external_name(&ss, klass, method_name, signature);
259 return ss.as_string();
260 }
261
262 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
263 signature->print_as_signature_external_return_type(os);
264 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
265 signature->print_as_signature_external_parameters(os);
266 os->print(")");
267 }
268
269 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
270 if (log_is_enabled(Debug, exceptions)) {
271 ResourceMark rm(THREAD);
272 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
273 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
274 }
275 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
276 // access exception table
277 ExceptionTable table(mh());
278 int length = table.length();
279 // iterate through all entries sequentially
280 constantPoolHandle pool(THREAD, mh->constants());
281 for (int i = 0; i < length; i ++) {
282 //reacquire the table in case a GC happened
283 ExceptionTable table(mh());
284 int beg_bci = table.start_pc(i);
285 int end_bci = table.end_pc(i);
286 assert(beg_bci <= end_bci, "inconsistent exception table");
287 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
288 beg_bci, end_bci);
289
290 if (beg_bci <= throw_bci && throw_bci < end_bci) {
291 // exception handler bci range covers throw_bci => investigate further
292 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
293
294 int handler_bci = table.handler_pc(i);
295 int klass_index = table.catch_type_index(i);
296 if (klass_index == 0) {
297 if (log_is_enabled(Info, exceptions)) {
298 ResourceMark rm(THREAD);
299 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
300 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
301 }
302 return handler_bci;
303 } else if (ex_klass == nullptr) {
304 // Is this even possible?
305 if (log_is_enabled(Info, exceptions)) {
306 ResourceMark rm(THREAD);
307 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
308 mh()->name()->as_C_string(), handler_bci);
309 }
310 return handler_bci;
311 } else {
312 if (log_is_enabled(Debug, exceptions)) {
313 ResourceMark rm(THREAD);
314 log_debug(exceptions)(" - resolving catch type \"%s\"",
315 pool->klass_name_at(klass_index)->as_C_string());
316 }
317 // we know the exception class => get the constraint class
318 // this may require loading of the constraint class; if verification
319 // fails or some other exception occurs, return handler_bci
320 Klass* k = pool->klass_at(klass_index, THREAD);
321 if (HAS_PENDING_EXCEPTION) {
322 if (log_is_enabled(Debug, exceptions)) {
323 ResourceMark rm(THREAD);
324 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
325 PENDING_EXCEPTION->klass()->external_name());
326 }
327 return handler_bci;
328 }
329 assert(k != nullptr, "klass not loaded");
330 if (ex_klass->is_subtype_of(k)) {
331 if (log_is_enabled(Info, exceptions)) {
332 ResourceMark rm(THREAD);
333 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
334 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
335 }
336 return handler_bci;
337 }
338 }
339 }
340 }
341
342 if (log_is_enabled(Debug, exceptions)) {
343 ResourceMark rm(THREAD);
344 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
345 ex_klass->external_name(), mh->name()->as_C_string());
346 }
347
348 return -1;
349 }
350
351 void Method::mask_for(int bci, InterpreterOopMap* mask) {
352 methodHandle h_this(Thread::current(), this);
353 mask_for(h_this, bci, mask);
354 }
355
356 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
357 assert(this_mh() == this, "Sanity");
358 method_holder()->mask_for(this_mh, bci, mask);
359 }
360
361 int Method::bci_from(address bcp) const {
362 if (is_native() && bcp == nullptr) {
363 return 0;
364 }
365 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
366 // may call this after interrupting a nested ResourceMark.
367 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
368 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
369
370 return int(bcp - code_base());
371 }
372
373
374 int Method::validate_bci(int bci) const {
375 // Called from the verifier, and should return -1 if not valid.
376 return ((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size())) ? bci : -1;
377 }
378
379 // Return bci if it appears to be a valid bcp
380 // Return -1 otherwise.
381 // Used by profiling code, when invalid data is a possibility.
382 // The caller is responsible for validating the Method* itself.
383 int Method::validate_bci_from_bcp(address bcp) const {
384 // keep bci as -1 if not a valid bci
385 int bci = -1;
386 if (bcp == nullptr || bcp == code_base()) {
387 // code_size() may return 0 and we allow 0 here
388 // the method may be native
389 bci = 0;
390 } else if (contains(bcp)) {
391 bci = int(bcp - code_base());
392 }
393 // Assert that if we have dodged any asserts, bci is negative.
394 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
395 return bci;
396 }
397
398 address Method::bcp_from(int bci) const {
399 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
400 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
401 address bcp = code_base() + bci;
402 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
403 return bcp;
404 }
405
406 address Method::bcp_from(address bcp) const {
407 if (is_native() && bcp == nullptr) {
408 return code_base();
409 } else {
410 return bcp;
411 }
412 }
413
414 int Method::size(bool is_native) {
415 // If native, then include pointers for native_function and signature_handler
416 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
417 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
418 return align_metadata_size(header_size() + extra_words);
419 }
420
421 Symbol* Method::klass_name() const {
422 return method_holder()->name();
423 }
424
425 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
426 log_trace(aot)("Iter(Method): %p", this);
427
428 if (!method_holder()->is_rewritten() || Arguments::is_valhalla_enabled()) {
429 it->push(&_constMethod, MetaspaceClosure::_writable);
430 } else {
431 it->push(&_constMethod);
432 }
433 it->push(&_adapter);
434 it->push(&_method_data);
435 it->push(&_method_counters);
436 NOT_PRODUCT(it->push(&_name);)
437 }
438
439 #if INCLUDE_CDS
440 // Attempt to return method to original state. Clear any pointers
441 // (to objects outside the shared spaces). We won't be able to predict
442 // where they should point in a new JVM. Further initialize some
443 // entries now in order allow them to be write protected later.
444
445 void Method::remove_unshareable_info() {
446 unlink_method();
447 if (method_data() != nullptr) {
448 method_data()->remove_unshareable_info();
449 }
450 if (method_counters() != nullptr) {
451 method_counters()->remove_unshareable_info();
452 }
453 if (CDSConfig::is_dumping_adapters() && _adapter != nullptr) {
454 _adapter->remove_unshareable_info();
455 _adapter = nullptr;
456 }
457 JFR_ONLY(REMOVE_METHOD_ID(this);)
458 }
459
460 void Method::restore_unshareable_info(TRAPS) {
461 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
462 if (method_data() != nullptr) {
463 method_data()->restore_unshareable_info(CHECK);
464 }
465 if (method_counters() != nullptr) {
466 method_counters()->restore_unshareable_info(CHECK);
467 }
468 if (_adapter != nullptr) {
469 assert(_adapter->is_linked(), "must be");
470 _from_compiled_entry = _adapter->get_c2i_entry();
471 _from_compiled_inline_entry = _adapter->get_c2i_inline_entry();
472 _from_compiled_inline_ro_entry = _adapter->get_c2i_inline_ro_entry();
473 }
474 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
475 }
476 #endif
477
478 void Method::set_vtable_index(int index) {
479 if (in_aot_cache() && !AOTMetaspace::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
480 // At runtime initialize_vtable is rerun as part of link_class_impl()
481 // for a shared class loaded by the non-boot loader to obtain the loader
482 // constraints based on the runtime classloaders' context.
483 return; // don't write into the shared class
484 } else {
485 _vtable_index = index;
486 }
487 }
488
489 void Method::set_itable_index(int index) {
490 if (in_aot_cache() && !AOTMetaspace::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
491 // At runtime initialize_itable is rerun as part of link_class_impl()
492 // for a shared class loaded by the non-boot loader to obtain the loader
493 // constraints based on the runtime classloaders' context. The dumptime
494 // itable index should be the same as the runtime index.
495 assert(_vtable_index == itable_index_max - index,
496 "archived itable index is different from runtime index");
497 return; // don't write into the shared class
498 } else {
499 _vtable_index = itable_index_max - index;
500 }
501 assert(valid_itable_index(), "");
502 }
503
504 // The RegisterNatives call being attempted tried to register with a method that
505 // is not native. Ask JVM TI what prefixes have been specified. Then check
506 // to see if the native method is now wrapped with the prefixes. See the
507 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
508 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
509 #if INCLUDE_JVMTI
510 ResourceMark rm(THREAD);
511 Method* method;
512 int name_len = name->utf8_length();
513 char* name_str = name->as_utf8();
514 int prefix_count;
515 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
516 for (int i = 0; i < prefix_count; i++) {
517 char* prefix = prefixes[i];
518 int prefix_len = (int)strlen(prefix);
519
520 // try adding this prefix to the method name and see if it matches another method name
521 int trial_len = name_len + prefix_len;
522 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
523 strcpy(trial_name_str, prefix);
524 strcat(trial_name_str, name_str);
525 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
526 if (trial_name == nullptr) {
527 continue; // no such symbol, so this prefix wasn't used, try the next prefix
528 }
529 method = k->lookup_method(trial_name, signature);
530 if (method == nullptr) {
531 continue; // signature doesn't match, try the next prefix
532 }
533 if (method->is_native()) {
534 method->set_is_prefixed_native();
535 return method; // wahoo, we found a prefixed version of the method, return it
536 }
537 // found as non-native, so prefix is good, add it, probably just need more prefixes
538 name_len = trial_len;
539 name_str = trial_name_str;
540 }
541 #endif // INCLUDE_JVMTI
542 return nullptr; // not found
543 }
544
545 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
546 Method* method = k->lookup_method(name, signature);
547 if (method == nullptr) {
548 ResourceMark rm(THREAD);
549 stringStream st;
550 st.print("Method '");
551 print_external_name(&st, k, name, signature);
552 st.print("' name or signature does not match");
553 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
554 }
555 if (!method->is_native()) {
556 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
557 method = find_prefixed_native(k, name, signature, THREAD);
558 if (method == nullptr) {
559 ResourceMark rm(THREAD);
560 stringStream st;
561 st.print("Method '");
562 print_external_name(&st, k, name, signature);
563 st.print("' is not declared as native");
564 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
565 }
566 }
567
568 if (entry != nullptr) {
569 method->set_native_function(entry, native_bind_event_is_interesting);
570 } else {
571 method->clear_native_function();
572 }
573 if (log_is_enabled(Debug, jni, resolve)) {
574 ResourceMark rm(THREAD);
575 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
576 method->method_holder()->external_name(),
577 method->name()->as_C_string());
578 }
579 return true;
580 }
581
582 bool Method::was_executed_more_than(int n) {
583 // Invocation counter is reset when the Method* is compiled.
584 // If the method has compiled code we therefore assume it has
585 // be executed more than n times.
586 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
587 // interpreter doesn't bump invocation counter of trivial methods
588 // compiler does not bump invocation counter of compiled methods
589 return true;
590 }
591 else if ((method_counters() != nullptr &&
592 method_counters()->invocation_counter()->carry()) ||
593 (method_data() != nullptr &&
594 method_data()->invocation_counter()->carry())) {
595 // The carry bit is set when the counter overflows and causes
596 // a compilation to occur. We don't know how many times
597 // the counter has been reset, so we simply assume it has
598 // been executed more than n times.
599 return true;
600 } else {
601 return invocation_count() > n;
602 }
603 }
604
605 void Method::print_invocation_count(outputStream* st) {
606 //---< compose+print method return type, klass, name, and signature >---
607 if (is_static()) { st->print("static "); }
608 if (is_final()) { st->print("final "); }
609 if (is_synchronized()) { st->print("synchronized "); }
610 if (is_native()) { st->print("native "); }
611 st->print("%s::", method_holder()->external_name());
612 name()->print_symbol_on(st);
613 signature()->print_symbol_on(st);
614
615 if (WizardMode) {
616 // dump the size of the byte codes
617 st->print(" {%d}", code_size());
618 }
619 st->cr();
620
621 // Counting based on signed int counters tends to overflow with
622 // longer-running workloads on fast machines. The counters under
623 // consideration here, however, are limited in range by counting
624 // logic. See InvocationCounter:count_limit for example.
625 // No "overflow precautions" need to be implemented here.
626 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
627 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
628 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
629
630 if (method_data() != nullptr) {
631 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
632 }
633
634 #ifndef PRODUCT
635 if (CountCompiledCalls) {
636 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
637 }
638 #endif
639 }
640
641 MethodTrainingData* Method::training_data_or_null() const {
642 MethodCounters* mcs = method_counters();
643 if (mcs == nullptr) {
644 return nullptr;
645 } else {
646 MethodTrainingData* mtd = mcs->method_training_data();
647 if (mtd == mcs->method_training_data_sentinel()) {
648 return nullptr;
649 }
650 return mtd;
651 }
652 }
653
654 bool Method::init_training_data(MethodTrainingData* td) {
655 MethodCounters* mcs = method_counters();
656 if (mcs == nullptr) {
657 return false;
658 } else {
659 return mcs->init_method_training_data(td);
660 }
661 }
662
663 bool Method::install_training_method_data(const methodHandle& method) {
664 MethodTrainingData* mtd = MethodTrainingData::find(method);
665 if (mtd != nullptr && mtd->final_profile() != nullptr) {
666 AtomicAccess::replace_if_null(&method->_method_data, mtd->final_profile());
667 return true;
668 }
669 return false;
670 }
671
672 // Build a MethodData* object to hold profiling information collected on this
673 // method when requested.
674 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
675 if (install_training_method_data(method)) {
676 return;
677 }
678 // Do not profile the method if metaspace has hit an OOM previously
679 // allocating profiling data. Callers clear pending exception so don't
680 // add one here.
681 if (ClassLoaderDataGraph::has_metaspace_oom()) {
682 return;
683 }
684
685 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
686 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
687 if (HAS_PENDING_EXCEPTION) {
688 CompileBroker::log_metaspace_failure();
689 ClassLoaderDataGraph::set_metaspace_oom(true);
690 return; // return the exception (which is cleared)
691 }
692
693 if (!AtomicAccess::replace_if_null(&method->_method_data, method_data)) {
694 MetadataFactory::free_metadata(loader_data, method_data);
695 return;
696 }
697
698 if (PrintMethodData && (Verbose || WizardMode)) {
699 ResourceMark rm(THREAD);
700 tty->print("build_profiling_method_data for ");
701 method->print_name(tty);
702 tty->cr();
703 // At the end of the run, the MDO, full of data, will be dumped.
704 }
705 }
706
707 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
708 // Do not profile the method if metaspace has hit an OOM previously
709 if (ClassLoaderDataGraph::has_metaspace_oom()) {
710 return nullptr;
711 }
712
713 methodHandle mh(current, m);
714 MethodCounters* counters;
715 if (current->is_Java_thread()) {
716 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
717 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
718 // if needed.
719 counters = MethodCounters::allocate_with_exception(mh, THREAD);
720 if (HAS_PENDING_EXCEPTION) {
721 CLEAR_PENDING_EXCEPTION;
722 }
723 } else {
724 // Call metaspace allocation that doesn't throw exception if the
725 // current thread isn't a JavaThread, ie. the VMThread.
726 counters = MethodCounters::allocate_no_exception(mh);
727 }
728
729 if (counters == nullptr) {
730 CompileBroker::log_metaspace_failure();
731 ClassLoaderDataGraph::set_metaspace_oom(true);
732 return nullptr;
733 }
734
735 if (!mh->init_method_counters(counters)) {
736 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
737 }
738
739 return mh->method_counters();
740 }
741
742 bool Method::init_method_counters(MethodCounters* counters) {
743 // Try to install a pointer to MethodCounters, return true on success.
744 return AtomicAccess::replace_if_null(&_method_counters, counters);
745 }
746
747 void Method::set_exception_handler_entered(int handler_bci) {
748 if (ProfileExceptionHandlers) {
749 MethodData* mdo = method_data();
750 if (mdo != nullptr) {
751 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
752 handler_data.set_exception_handler_entered();
753 }
754 }
755 }
756
757 int Method::extra_stack_words() {
758 // not an inline function, to avoid a header dependency on Interpreter
759 return extra_stack_entries() * Interpreter::stackElementSize;
760 }
761
762 // InlineKlass the method is declared to return. This must not
763 // safepoint as it is called with references live on the stack at
764 // locations the GC is unaware of.
765 InlineKlass* Method::returns_inline_type() const {
766 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
767 if (is_native()) {
768 return nullptr;
769 }
770 NoSafepointVerifier nsv;
771 SignatureStream ss(signature());
772 ss.skip_to_return_type();
773 return ss.as_inline_klass(method_holder());
774 }
775
776 bool Method::compute_has_loops_flag() {
777 BytecodeStream bcs(methodHandle(Thread::current(), this));
778 Bytecodes::Code bc;
779
780 while ((bc = bcs.next()) >= 0) {
781 switch (bc) {
782 case Bytecodes::_ifeq:
783 case Bytecodes::_ifnull:
784 case Bytecodes::_iflt:
785 case Bytecodes::_ifle:
786 case Bytecodes::_ifne:
787 case Bytecodes::_ifnonnull:
788 case Bytecodes::_ifgt:
789 case Bytecodes::_ifge:
790 case Bytecodes::_if_icmpeq:
791 case Bytecodes::_if_icmpne:
792 case Bytecodes::_if_icmplt:
793 case Bytecodes::_if_icmpgt:
794 case Bytecodes::_if_icmple:
795 case Bytecodes::_if_icmpge:
796 case Bytecodes::_if_acmpeq:
797 case Bytecodes::_if_acmpne:
798 case Bytecodes::_goto:
799 case Bytecodes::_jsr:
800 if (bcs.dest() < bcs.next_bci()) {
801 return set_has_loops();
802 }
803 break;
804
805 case Bytecodes::_goto_w:
806 case Bytecodes::_jsr_w:
807 if (bcs.dest_w() < bcs.next_bci()) {
808 return set_has_loops();
809 }
810 break;
811
812 case Bytecodes::_lookupswitch: {
813 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
814 if (lookupswitch.default_offset() < 0) {
815 return set_has_loops();
816 } else {
817 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
818 LookupswitchPair pair = lookupswitch.pair_at(i);
819 if (pair.offset() < 0) {
820 return set_has_loops();
821 }
822 }
823 }
824 break;
825 }
826 case Bytecodes::_tableswitch: {
827 Bytecode_tableswitch tableswitch(this, bcs.bcp());
828 if (tableswitch.default_offset() < 0) {
829 return set_has_loops();
830 } else {
831 for (int i = 0; i < tableswitch.length(); ++i) {
832 if (tableswitch.dest_offset_at(i) < 0) {
833 return set_has_loops();
834 }
835 }
836 }
837 break;
838 }
839 default:
840 break;
841 }
842 }
843
844 _flags.set_has_loops_flag_init(true);
845 return false;
846 }
847
848 bool Method::is_final_method(AccessFlags class_access_flags) const {
849 // or "does_not_require_vtable_entry"
850 // default method or overpass can occur, is not final (reuses vtable entry)
851 // private methods in classes get vtable entries for backward class compatibility.
852 if (is_overpass() || is_default_method()) return false;
853 return is_final() || class_access_flags.is_final();
854 }
855
856 bool Method::is_final_method() const {
857 return is_final_method(method_holder()->access_flags());
858 }
859
860 bool Method::is_default_method() const {
861 if (method_holder() != nullptr &&
862 method_holder()->is_interface() &&
863 !is_abstract() && !is_private()) {
864 return true;
865 } else {
866 return false;
867 }
868 }
869
870 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
871 if (is_final_method(class_access_flags)) return true;
872 #ifdef ASSERT
873 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
874 if (class_access_flags.is_interface()) {
875 ResourceMark rm;
876 assert(is_nonv == is_static() || is_nonv == is_private(),
877 "nonvirtual unexpected for non-static, non-private: %s",
878 name_and_sig_as_C_string());
879 }
880 #endif
881 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
882 return vtable_index() == nonvirtual_vtable_index;
883 }
884
885 bool Method::can_be_statically_bound() const {
886 return can_be_statically_bound(method_holder()->access_flags());
887 }
888
889 bool Method::can_be_statically_bound(InstanceKlass* context) const {
890 return (method_holder() == context) && can_be_statically_bound();
891 }
892
893 /**
894 * Returns false if this is one of specially treated methods for
895 * which we have to provide stack trace in throw in compiled code.
896 * Returns true otherwise.
897 */
898 bool Method::can_omit_stack_trace() {
899 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
900 return false; // All methods in sun.invoke.util.ValueConversions
901 }
902 return true;
903 }
904
905 bool Method::is_accessor() const {
906 return is_getter() || is_setter();
907 }
908
909 bool Method::is_getter() const {
910 if (code_size() != 5) return false;
911 if (size_of_parameters() != 1) return false;
912 if (java_code_at(0) != Bytecodes::_aload_0) return false;
913 if (java_code_at(1) != Bytecodes::_getfield) return false;
914 switch (java_code_at(4)) {
915 case Bytecodes::_ireturn:
916 case Bytecodes::_lreturn:
917 case Bytecodes::_freturn:
918 case Bytecodes::_dreturn:
919 case Bytecodes::_areturn:
920 break;
921 default:
922 return false;
923 }
924 if (has_scalarized_return()) {
925 // Don't treat this as (trivial) getter method because the
926 // inline type should be returned in a scalarized form.
927 return false;
928 }
929 return true;
930 }
931
932 bool Method::is_setter() const {
933 if (code_size() != 6) return false;
934 if (java_code_at(0) != Bytecodes::_aload_0) return false;
935 switch (java_code_at(1)) {
936 case Bytecodes::_iload_1:
937 case Bytecodes::_aload_1:
938 case Bytecodes::_fload_1:
939 if (size_of_parameters() != 2) return false;
940 break;
941 case Bytecodes::_dload_1:
942 case Bytecodes::_lload_1:
943 if (size_of_parameters() != 3) return false;
944 break;
945 default:
946 return false;
947 }
948 if (java_code_at(2) != Bytecodes::_putfield) return false;
949 if (java_code_at(5) != Bytecodes::_return) return false;
950 if (has_scalarized_args()) {
951 // Don't treat this as (trivial) setter method because the
952 // inline type argument should be passed in a scalarized form.
953 return false;
954 }
955 return true;
956 }
957
958 bool Method::is_constant_getter() const {
959 int last_index = code_size() - 1;
960 // Check if the first 1-3 bytecodes are a constant push
961 // and the last bytecode is a return.
962 return (2 <= code_size() && code_size() <= 4 &&
963 Bytecodes::is_const(java_code_at(0)) &&
964 Bytecodes::length_for(java_code_at(0)) == last_index &&
965 Bytecodes::is_return(java_code_at(last_index)) &&
966 !has_scalarized_args());
967 }
968
969 bool Method::is_class_initializer() const {
970 // For classfiles version 51 or greater, ensure that the clinit method is
971 // static. Non-static methods with the name "<clinit>" are not static
972 // initializers. (older classfiles exempted for backward compatibility)
973 return (name() == vmSymbols::class_initializer_name() &&
974 (is_static() ||
975 method_holder()->major_version() < 51));
976 }
977
978 // A method named <init>, is a classic object constructor.
979 bool Method::is_object_constructor() const {
980 return name() == vmSymbols::object_initializer_name();
981 }
982
983 bool Method::needs_clinit_barrier() const {
984 return is_static() && !method_holder()->is_initialized();
985 }
986
987 bool Method::is_object_wait0() const {
988 return klass_name() == vmSymbols::java_lang_Object()
989 && name() == vmSymbols::wait_name();
990 }
991
992 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
993 int length = method->checked_exceptions_length();
994 if (length == 0) { // common case
995 return objArrayHandle(THREAD, Universe::the_empty_class_array());
996 } else {
997 methodHandle h_this(THREAD, method);
998 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
999 objArrayHandle mirrors (THREAD, m_oop);
1000 for (int i = 0; i < length; i++) {
1001 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
1002 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
1003 if (log_is_enabled(Warning, exceptions) &&
1004 !k->is_subclass_of(vmClasses::Throwable_klass())) {
1005 ResourceMark rm(THREAD);
1006 log_warning(exceptions)(
1007 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
1008 k->external_name(), method->external_name());
1009 }
1010 mirrors->obj_at_put(i, k->java_mirror());
1011 }
1012 return mirrors;
1013 }
1014 };
1015
1016
1017 int Method::line_number_from_bci(int bci) const {
1018 int best_bci = 0;
1019 int best_line = -1;
1020 if (bci == SynchronizationEntryBCI) bci = 0;
1021 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
1022 // The line numbers are a short array of 2-tuples [start_pc, line_number].
1023 // Not necessarily sorted and not necessarily one-to-one.
1024 CompressedLineNumberReadStream stream(compressed_linenumber_table());
1025 while (stream.read_pair()) {
1026 if (stream.bci() == bci) {
1027 // perfect match
1028 return stream.line();
1029 } else {
1030 // update best_bci/line
1031 if (stream.bci() < bci && stream.bci() >= best_bci) {
1032 best_bci = stream.bci();
1033 best_line = stream.line();
1034 }
1035 }
1036 }
1037 }
1038 return best_line;
1039 }
1040
1041
1042 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1043 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
1044 Thread *thread = Thread::current();
1045 Symbol* klass_name = constants()->klass_name_at(klass_index);
1046 Handle loader(thread, method_holder()->class_loader());
1047 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr;
1048 } else {
1049 return true;
1050 }
1051 }
1052
1053
1054 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1055 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1056 if (must_be_resolved) {
1057 // Make sure klass is resolved in constantpool.
1058 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
1059 return false;
1060 }
1061 }
1062 return is_klass_loaded_by_klass_index(klass_index);
1063 }
1064
1065
1066 void Method::set_native_function(address function, bool post_event_flag) {
1067 assert(function != nullptr, "use clear_native_function to unregister natives");
1068 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1069 address* native_function = native_function_addr();
1070
1071 // We can see racers trying to place the same native function into place. Once
1072 // is plenty.
1073 address current = *native_function;
1074 if (current == function) return;
1075 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1076 function != nullptr) {
1077 // native_method_throw_unsatisfied_link_error_entry() should only
1078 // be passed when post_event_flag is false.
1079 assert(function !=
1080 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1081 "post_event_flag mismatch");
1082
1083 // post the bind event, and possible change the bind function
1084 JvmtiExport::post_native_method_bind(this, &function);
1085 }
1086 *native_function = function;
1087 // This function can be called more than once. We must make sure that we always
1088 // use the latest registered method -> check if a stub already has been generated.
1089 // If so, we have to make it not_entrant.
1090 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1091 if (nm != nullptr) {
1092 nm->make_not_entrant(nmethod::InvalidationReason::SET_NATIVE_FUNCTION);
1093 }
1094 }
1095
1096
1097 bool Method::has_native_function() const {
1098 if (is_special_native_intrinsic())
1099 return false; // special-cased in SharedRuntime::generate_native_wrapper
1100 address func = native_function();
1101 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1102 }
1103
1104
1105 void Method::clear_native_function() {
1106 // Note: is_method_handle_intrinsic() is allowed here.
1107 set_native_function(
1108 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1109 !native_bind_event_is_interesting);
1110 this->unlink_code();
1111 }
1112
1113
1114 void Method::set_signature_handler(address handler) {
1115 address* signature_handler = signature_handler_addr();
1116 *signature_handler = handler;
1117 }
1118
1119
1120 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1121 assert(reason != nullptr, "must provide a reason");
1122 if (PrintCompilation && report) {
1123 ttyLocker ttyl;
1124 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1125 if (comp_level == CompLevel_all) {
1126 tty->print("all levels ");
1127 } else {
1128 tty->print("level %d ", comp_level);
1129 }
1130 this->print_short_name(tty);
1131 int size = this->code_size();
1132 if (size > 0) {
1133 tty->print(" (%d bytes)", size);
1134 }
1135 if (reason != nullptr) {
1136 tty->print(" %s", reason);
1137 }
1138 tty->cr();
1139 }
1140 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1141 ttyLocker ttyl;
1142 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'",
1143 os::current_thread_id(), is_osr, comp_level);
1144 if (reason != nullptr) {
1145 xtty->print(" reason=\'%s\'", reason);
1146 }
1147 xtty->method(this);
1148 xtty->stamp();
1149 xtty->end_elem();
1150 }
1151 }
1152
1153 bool Method::is_always_compilable() const {
1154 // Generated adapters must be compiled
1155 if (is_special_native_intrinsic() && is_synthetic()) {
1156 assert(!is_not_c1_compilable(), "sanity check");
1157 assert(!is_not_c2_compilable(), "sanity check");
1158 return true;
1159 }
1160
1161 return false;
1162 }
1163
1164 bool Method::is_not_compilable(int comp_level) const {
1165 if (number_of_breakpoints() > 0)
1166 return true;
1167 if (is_always_compilable())
1168 return false;
1169 if (comp_level == CompLevel_any)
1170 return is_not_c1_compilable() && is_not_c2_compilable();
1171 if (is_c1_compile(comp_level))
1172 return is_not_c1_compilable();
1173 if (is_c2_compile(comp_level))
1174 return is_not_c2_compilable();
1175 return false;
1176 }
1177
1178 // call this when compiler finds that this method is not compilable
1179 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1180 if (is_always_compilable()) {
1181 // Don't mark a method which should be always compilable
1182 return;
1183 }
1184 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1185 if (comp_level == CompLevel_all) {
1186 set_is_not_c1_compilable();
1187 set_is_not_c2_compilable();
1188 } else {
1189 if (is_c1_compile(comp_level))
1190 set_is_not_c1_compilable();
1191 if (is_c2_compile(comp_level))
1192 set_is_not_c2_compilable();
1193 }
1194 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1195 }
1196
1197 bool Method::is_not_osr_compilable(int comp_level) const {
1198 if (is_not_compilable(comp_level))
1199 return true;
1200 if (comp_level == CompLevel_any)
1201 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1202 if (is_c1_compile(comp_level))
1203 return is_not_c1_osr_compilable();
1204 if (is_c2_compile(comp_level))
1205 return is_not_c2_osr_compilable();
1206 return false;
1207 }
1208
1209 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1210 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1211 if (comp_level == CompLevel_all) {
1212 set_is_not_c1_osr_compilable();
1213 set_is_not_c2_osr_compilable();
1214 } else {
1215 if (is_c1_compile(comp_level))
1216 set_is_not_c1_osr_compilable();
1217 if (is_c2_compile(comp_level))
1218 set_is_not_c2_osr_compilable();
1219 }
1220 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1221 }
1222
1223 // Revert to using the interpreter and clear out the nmethod
1224 void Method::clear_code() {
1225 // this may be null if c2i adapters have not been made yet
1226 // Only should happen at allocate time.
1227 if (adapter() == nullptr) {
1228 _from_compiled_entry = nullptr;
1229 _from_compiled_inline_entry = nullptr;
1230 _from_compiled_inline_ro_entry = nullptr;
1231 } else {
1232 _from_compiled_entry = adapter()->get_c2i_entry();
1233 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1234 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1235 }
1236 OrderAccess::storestore();
1237 _from_interpreted_entry = _i2i_entry;
1238 OrderAccess::storestore();
1239 _code = nullptr;
1240 }
1241
1242 void Method::unlink_code(nmethod *compare) {
1243 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1244 // We need to check if either the _code or _from_compiled_code_entry_point
1245 // refer to this nmethod because there is a race in setting these two fields
1246 // in Method* as seen in bugid 4947125.
1247 if (code() == compare ||
1248 from_compiled_entry() == compare->verified_entry_point()) {
1249 clear_code();
1250 }
1251 }
1252
1253 void Method::unlink_code() {
1254 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1255 clear_code();
1256 }
1257
1258 #if INCLUDE_CDS
1259 // Called by class data sharing to remove any entry points (which are not shared)
1260 void Method::unlink_method() {
1261 assert(CDSConfig::is_dumping_archive(), "sanity");
1262 _code = nullptr;
1263 if (!CDSConfig::is_dumping_adapters()) {
1264 _adapter = nullptr;
1265 }
1266 _i2i_entry = nullptr;
1267 _from_compiled_entry = nullptr;
1268 _from_compiled_inline_entry = nullptr;
1269 _from_compiled_inline_ro_entry = nullptr;
1270 _from_interpreted_entry = nullptr;
1271
1272 if (is_native()) {
1273 *native_function_addr() = nullptr;
1274 set_signature_handler(nullptr);
1275 }
1276 NOT_PRODUCT(set_compiled_invocation_count(0);)
1277
1278 clear_method_data();
1279 clear_method_counters();
1280 clear_is_not_c1_compilable();
1281 clear_is_not_c1_osr_compilable();
1282 clear_is_not_c2_compilable();
1283 clear_is_not_c2_osr_compilable();
1284 clear_queued_for_compilation();
1285
1286 remove_unshareable_flags();
1287 }
1288
1289 void Method::remove_unshareable_flags() {
1290 // clear all the flags that shouldn't be in the archived version
1291 assert(!is_old(), "must be");
1292 assert(!is_obsolete(), "must be");
1293 assert(!is_deleted(), "must be");
1294
1295 set_is_prefixed_native(false);
1296 set_queued_for_compilation(false);
1297 set_is_not_c2_compilable(false);
1298 set_is_not_c1_compilable(false);
1299 set_is_not_c2_osr_compilable(false);
1300 set_on_stack_flag(false);
1301 set_has_scalarized_args(false);
1302 set_has_scalarized_return(false);
1303 }
1304 #endif
1305
1306 // Called when the method_holder is getting linked. Setup entrypoints so the method
1307 // is ready to be called from interpreter, compiler, and vtables.
1308 void Method::link_method(const methodHandle& h_method, TRAPS) {
1309 if (log_is_enabled(Info, perf, class, link)) {
1310 ClassLoader::perf_ik_link_methods_count()->inc();
1311 }
1312
1313 // If the code cache is full, we may reenter this function for the
1314 // leftover methods that weren't linked.
1315 if (adapter() != nullptr) {
1316 if (adapter()->in_aot_cache()) {
1317 assert(adapter()->is_linked(), "Adapter is shared but not linked");
1318 } else {
1319 return;
1320 }
1321 }
1322 assert( _code == nullptr, "nothing compiled yet" );
1323
1324 // Setup interpreter entrypoint
1325 assert(this == h_method(), "wrong h_method()" );
1326
1327 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache");
1328 address entry = Interpreter::entry_for_method(h_method);
1329 assert(entry != nullptr, "interpreter entry must be non-null");
1330 // Sets both _i2i_entry and _from_interpreted_entry
1331 set_interpreter_entry(entry);
1332
1333 // Don't overwrite already registered native entries.
1334 if (is_native() && !has_native_function()) {
1335 set_native_function(
1336 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1337 !native_bind_event_is_interesting);
1338 }
1339 if (InlineTypeReturnedAsFields && returns_inline_type() && !has_scalarized_return()) {
1340 set_has_scalarized_return();
1341 }
1342
1343 // Setup compiler entrypoint. This is made eagerly, so we do not need
1344 // special handling of vtables. An alternative is to make adapters more
1345 // lazily by calling make_adapter() from from_compiled_entry() for the
1346 // normal calls. For vtable calls life gets more complicated. When a
1347 // call-site goes mega-morphic we need adapters in all methods which can be
1348 // called from the vtable. We need adapters on such methods that get loaded
1349 // later. Ditto for mega-morphic itable calls. If this proves to be a
1350 // problem we'll make these lazily later.
1351 // With the scalarized calling convention, create adapters for abstract
1352 // methods as well because the adapter is used to propagate the signature.
1353 if (_adapter == nullptr && (!h_method->is_abstract() || InlineTypePassFieldsAsArgs)) {
1354 make_adapters(h_method, CHECK);
1355 }
1356 h_method->_from_compiled_entry = h_method->get_c2i_entry();
1357 h_method->_from_compiled_inline_entry = h_method->get_c2i_inline_entry();
1358 h_method->_from_compiled_inline_ro_entry = h_method->get_c2i_inline_ro_entry();
1359
1360 // ONLY USE the h_method now as make_adapter may have blocked
1361
1362 if (h_method->is_continuation_native_intrinsic()) {
1363 _from_interpreted_entry = nullptr;
1364 _from_compiled_entry = nullptr;
1365 _i2i_entry = nullptr;
1366 if (Continuations::enabled()) {
1367 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1368 AdapterHandlerLibrary::create_native_wrapper(h_method);
1369 if (!h_method->has_compiled_code()) {
1370 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1371 }
1372 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1373 }
1374 }
1375 }
1376
1377 void Method::make_adapters(const methodHandle& mh, TRAPS) {
1378 assert(!mh->is_abstract() || InlineTypePassFieldsAsArgs, "abstract methods do not have adapters");
1379 PerfTraceTime timer(ClassLoader::perf_method_adapters_time());
1380
1381 // Adapters for compiled code are made eagerly here. They are fairly
1382 // small (generally < 100 bytes) and quick to make (and cached and shared)
1383 // so making them eagerly shouldn't be too expensive.
1384 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1385 if (adapter == nullptr ) {
1386 if (!is_init_completed()) {
1387 // Don't throw exceptions during VM initialization because java.lang.* classes
1388 // might not have been initialized, causing problems when constructing the
1389 // Java exception object.
1390 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1391 } else {
1392 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1393 }
1394 }
1395
1396 assert(!mh->has_scalarized_args() || (adapter->get_sig_cc() != nullptr && adapter->get_sig_cc_ro() != nullptr), "should be initialized");
1397
1398 mh->set_adapter_entry(adapter);
1399 #ifndef ZERO
1400 assert(adapter->is_linked(), "Adapter must have been linked");
1401 #endif
1402 }
1403
1404 // The verified_code_entry() must be called when a invoke is resolved
1405 // on this method.
1406
1407 // It returns the compiled code entry point, after asserting not null.
1408 // This function is called after potential safepoints so that nmethod
1409 // or adapter that it points to is still live and valid.
1410 // This function must not hit a safepoint!
1411 address Method::verified_code_entry() {
1412 DEBUG_ONLY(NoSafepointVerifier nsv;)
1413 assert(_from_compiled_entry != nullptr, "must be set");
1414 return _from_compiled_entry;
1415 }
1416
1417 address Method::verified_inline_code_entry() {
1418 DEBUG_ONLY(NoSafepointVerifier nsv;)
1419 assert(_from_compiled_inline_entry != nullptr, "must be set");
1420 return _from_compiled_inline_entry;
1421 }
1422
1423 address Method::verified_inline_ro_code_entry() {
1424 DEBUG_ONLY(NoSafepointVerifier nsv;)
1425 assert(_from_compiled_inline_ro_entry != nullptr, "must be set");
1426 return _from_compiled_inline_ro_entry;
1427 }
1428
1429 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1430 // (could be racing a deopt).
1431 // Not inline to avoid circular ref.
1432 bool Method::check_code() const {
1433 // cached in a register or local. There's a race on the value of the field.
1434 nmethod *code = AtomicAccess::load_acquire(&_code);
1435 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1436 }
1437
1438 // Install compiled code. Instantly it can execute.
1439 void Method::set_code(const methodHandle& mh, nmethod *code) {
1440 assert_lock_strong(NMethodState_lock);
1441 assert( code, "use clear_code to remove code" );
1442 assert( mh->check_code(), "" );
1443
1444 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1445
1446 // These writes must happen in this order, because the interpreter will
1447 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1448 // which jumps to _from_compiled_entry.
1449 mh->_code = code; // Assign before allowing compiled code to exec
1450
1451 int comp_level = code->comp_level();
1452 // In theory there could be a race here. In practice it is unlikely
1453 // and not worth worrying about.
1454 if (comp_level > mh->highest_comp_level()) {
1455 mh->set_highest_comp_level(comp_level);
1456 }
1457
1458 OrderAccess::storestore();
1459 mh->_from_compiled_entry = code->verified_entry_point();
1460 mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1461 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1462 OrderAccess::storestore();
1463
1464 if (mh->is_continuation_native_intrinsic()) {
1465 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1466
1467 if (mh->is_continuation_enter_intrinsic()) {
1468 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1469 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1470 } else if (mh->is_continuation_yield_intrinsic()) {
1471 mh->_i2i_entry = mh->get_i2c_entry();
1472 } else {
1473 guarantee(false, "Unknown Continuation native intrinsic");
1474 }
1475 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1476 AtomicAccess::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1477 } else if (!mh->is_method_handle_intrinsic()) {
1478 // Instantly compiled code can execute.
1479 mh->_from_interpreted_entry = mh->get_i2c_entry();
1480 }
1481 }
1482
1483
1484 bool Method::is_overridden_in(Klass* k) const {
1485 InstanceKlass* ik = InstanceKlass::cast(k);
1486
1487 if (ik->is_interface()) return false;
1488
1489 // If method is an interface, we skip it - except if it
1490 // is a miranda method
1491 if (method_holder()->is_interface()) {
1492 // Check that method is not a miranda method
1493 if (ik->lookup_method(name(), signature()) == nullptr) {
1494 // No implementation exist - so miranda method
1495 return false;
1496 }
1497 return true;
1498 }
1499
1500 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1501 if (!has_vtable_index()) {
1502 return false;
1503 } else {
1504 Method* vt_m = ik->method_at_vtable(vtable_index());
1505 return vt_m != this;
1506 }
1507 }
1508
1509
1510 // give advice about whether this Method* should be cached or not
1511 bool Method::should_not_be_cached() const {
1512 if (is_old()) {
1513 // This method has been redefined. It is either EMCP or obsolete
1514 // and we don't want to cache it because that would pin the method
1515 // down and prevent it from being collectible if and when it
1516 // finishes executing.
1517 return true;
1518 }
1519
1520 // caching this method should be just fine
1521 return false;
1522 }
1523
1524
1525 /**
1526 * Returns true if this is one of the specially treated methods for
1527 * security related stack walks (like Reflection.getCallerClass).
1528 */
1529 bool Method::is_ignored_by_security_stack_walk() const {
1530 if (intrinsic_id() == vmIntrinsics::_invoke) {
1531 // This is Method.invoke() -- ignore it
1532 return true;
1533 }
1534 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1535 // This is an auxiliary frame -- ignore it
1536 return true;
1537 }
1538 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1539 // This is an internal adapter frame for method handles -- ignore it
1540 return true;
1541 }
1542 return false;
1543 }
1544
1545
1546 // Constant pool structure for invoke methods:
1547 enum {
1548 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1549 _imcp_invoke_signature, // utf8: (variable Symbol*)
1550 _imcp_limit
1551 };
1552
1553 // Test if this method is an MH adapter frame generated by Java code.
1554 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1555 bool Method::is_compiled_lambda_form() const {
1556 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1557 }
1558
1559 // Test if this method is an internal MH primitive method.
1560 bool Method::is_method_handle_intrinsic() const {
1561 vmIntrinsics::ID iid = intrinsic_id();
1562 return (MethodHandles::is_signature_polymorphic(iid) &&
1563 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1564 }
1565
1566 bool Method::has_member_arg() const {
1567 vmIntrinsics::ID iid = intrinsic_id();
1568 return (MethodHandles::is_signature_polymorphic(iid) &&
1569 MethodHandles::has_member_arg(iid));
1570 }
1571
1572 // Make an instance of a signature-polymorphic internal MH primitive.
1573 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1574 Symbol* signature,
1575 TRAPS) {
1576 ResourceMark rm(THREAD);
1577 methodHandle empty;
1578
1579 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1580 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1581 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1582
1583 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1584
1585 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1586 name->increment_refcount();
1587 signature->increment_refcount();
1588
1589 int cp_length = _imcp_limit;
1590 ClassLoaderData* loader_data = holder->class_loader_data();
1591 constantPoolHandle cp;
1592 {
1593 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1594 cp = constantPoolHandle(THREAD, cp_oop);
1595 }
1596 cp->copy_fields(holder->constants());
1597 cp->set_pool_holder(holder);
1598 cp->symbol_at_put(_imcp_invoke_name, name);
1599 cp->symbol_at_put(_imcp_invoke_signature, signature);
1600 cp->set_has_preresolution();
1601 cp->set_is_for_method_handle_intrinsic();
1602
1603 // decide on access bits: public or not?
1604 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1605 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1606 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1607 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1608
1609 methodHandle m;
1610 {
1611 InlineTableSizes sizes;
1612 Method* m_oop = Method::allocate(loader_data, 0,
1613 accessFlags_from(flags_bits), &sizes,
1614 ConstMethod::NORMAL,
1615 name,
1616 CHECK_(empty));
1617 m = methodHandle(THREAD, m_oop);
1618 }
1619 m->set_constants(cp());
1620 m->set_name_index(_imcp_invoke_name);
1621 m->set_signature_index(_imcp_invoke_signature);
1622 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1623 assert(m->signature() == signature, "");
1624 m->constMethod()->compute_from_signature(signature, must_be_static);
1625 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1626 assert(m->is_method_handle_intrinsic(), "");
1627 #ifdef ASSERT
1628 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1629 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1630 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1631 #endif //ASSERT
1632
1633 // Finally, set up its entry points.
1634 assert(m->can_be_statically_bound(), "");
1635 m->set_vtable_index(Method::nonvirtual_vtable_index);
1636 m->link_method(m, CHECK_(empty));
1637
1638 if (iid == vmIntrinsics::_linkToNative) {
1639 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1640 }
1641 if (log_is_enabled(Debug, methodhandles)) {
1642 LogTarget(Debug, methodhandles) lt;
1643 LogStream ls(lt);
1644 m->print_on(&ls);
1645 }
1646
1647 return m;
1648 }
1649
1650 #if INCLUDE_CDS
1651 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1652 if (m->adapter() != nullptr) {
1653 m->set_from_compiled_entry(m->adapter()->get_c2i_entry());
1654 m->set_from_compiled_inline_entry(m->adapter()->get_c2i_inline_entry());
1655 m->set_from_compiled_inline_ro_entry(m->adapter()->get_c2i_inline_ro_entry());
1656 }
1657 m->link_method(m, CHECK);
1658
1659 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1660 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1661 }
1662 }
1663 #endif
1664
1665 Klass* Method::check_non_bcp_klass(Klass* klass) {
1666 if (klass != nullptr && klass->class_loader() != nullptr) {
1667 if (klass->is_objArray_klass())
1668 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1669 return klass;
1670 }
1671 return nullptr;
1672 }
1673
1674
1675 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1676 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1677 // Code below does not work for native methods - they should never get rewritten anyway
1678 assert(!m->is_native(), "cannot rewrite native methods");
1679 // Allocate new Method*
1680 AccessFlags flags = m->access_flags();
1681
1682 ConstMethod* cm = m->constMethod();
1683 int checked_exceptions_len = cm->checked_exceptions_length();
1684 int localvariable_len = cm->localvariable_table_length();
1685 int exception_table_len = cm->exception_table_length();
1686 int method_parameters_len = cm->method_parameters_length();
1687 int method_annotations_len = cm->method_annotations_length();
1688 int parameter_annotations_len = cm->parameter_annotations_length();
1689 int type_annotations_len = cm->type_annotations_length();
1690 int default_annotations_len = cm->default_annotations_length();
1691
1692 InlineTableSizes sizes(
1693 localvariable_len,
1694 new_compressed_linenumber_size,
1695 exception_table_len,
1696 checked_exceptions_len,
1697 method_parameters_len,
1698 cm->generic_signature_index(),
1699 method_annotations_len,
1700 parameter_annotations_len,
1701 type_annotations_len,
1702 default_annotations_len,
1703 0);
1704
1705 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1706 Method* newm_oop = Method::allocate(loader_data,
1707 new_code_length,
1708 flags,
1709 &sizes,
1710 m->method_type(),
1711 m->name(),
1712 CHECK_(methodHandle()));
1713 methodHandle newm (THREAD, newm_oop);
1714
1715 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1716 ConstMethod* newcm = newm->constMethod();
1717 int new_const_method_size = newm->constMethod()->size();
1718
1719 // This works because the source and target are both Methods. Some compilers
1720 // (e.g., clang) complain that the target vtable pointer will be stomped,
1721 // so cast away newm()'s and m()'s Methodness.
1722 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1723
1724 // Create shallow copy of ConstMethod.
1725 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1726
1727 // Reset correct method/const method, method size, and parameter info
1728 newm->set_constMethod(newcm);
1729 newm->constMethod()->set_code_size(new_code_length);
1730 newm->constMethod()->set_constMethod_size(new_const_method_size);
1731 assert(newm->code_size() == new_code_length, "check");
1732 assert(newm->method_parameters_length() == method_parameters_len, "check");
1733 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1734 assert(newm->exception_table_length() == exception_table_len, "check");
1735 assert(newm->localvariable_table_length() == localvariable_len, "check");
1736 // Copy new byte codes
1737 memcpy(newm->code_base(), new_code, new_code_length);
1738 // Copy line number table
1739 if (new_compressed_linenumber_size > 0) {
1740 memcpy(newm->compressed_linenumber_table(),
1741 new_compressed_linenumber_table,
1742 new_compressed_linenumber_size);
1743 }
1744 // Copy method_parameters
1745 if (method_parameters_len > 0) {
1746 memcpy(newm->method_parameters_start(),
1747 m->method_parameters_start(),
1748 method_parameters_len * sizeof(MethodParametersElement));
1749 }
1750 // Copy checked_exceptions
1751 if (checked_exceptions_len > 0) {
1752 memcpy(newm->checked_exceptions_start(),
1753 m->checked_exceptions_start(),
1754 checked_exceptions_len * sizeof(CheckedExceptionElement));
1755 }
1756 // Copy exception table
1757 if (exception_table_len > 0) {
1758 memcpy(newm->exception_table_start(),
1759 m->exception_table_start(),
1760 exception_table_len * sizeof(ExceptionTableElement));
1761 }
1762 // Copy local variable number table
1763 if (localvariable_len > 0) {
1764 memcpy(newm->localvariable_table_start(),
1765 m->localvariable_table_start(),
1766 localvariable_len * sizeof(LocalVariableTableElement));
1767 }
1768 // Copy stackmap table
1769 if (m->has_stackmap_table()) {
1770 int code_attribute_length = m->stackmap_data()->length();
1771 Array<u1>* stackmap_data =
1772 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1773 memcpy((void*)stackmap_data->adr_at(0),
1774 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1775 newm->set_stackmap_data(stackmap_data);
1776 }
1777
1778 // copy annotations over to new method
1779 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1780 return newm;
1781 }
1782
1783 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1784 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1785 // because we are not loading from core libraries
1786 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1787 // which does not use the class default class loader so we check for its loader here
1788 const InstanceKlass* ik = InstanceKlass::cast(holder);
1789 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1790 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1791 }
1792
1793 // see if the klass name is well-known:
1794 Symbol* klass_name = ik->name();
1795 vmSymbolID id = vmSymbols::find_sid(klass_name);
1796 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1797 return id;
1798 } else {
1799 return vmSymbolID::NO_SID;
1800 }
1801 }
1802
1803 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1804 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1805 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1806 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1807 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1808
1809 // the klass name is well-known:
1810 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1811 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1812
1813 // ditto for method and signature:
1814 vmSymbolID name_id = vmSymbols::find_sid(name());
1815 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1816 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1817 && name_id == vmSymbolID::NO_SID) {
1818 return;
1819 }
1820 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1821 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1822 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1823 && sig_id == vmSymbolID::NO_SID) {
1824 return;
1825 }
1826
1827 u2 flags = access_flags().as_method_flags();
1828 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1829 if (id != vmIntrinsics::_none) {
1830 set_intrinsic_id(id);
1831 if (id == vmIntrinsics::_Class_cast) {
1832 // Even if the intrinsic is rejected, we want to inline this simple method.
1833 set_force_inline();
1834 }
1835 return;
1836 }
1837
1838 // A few slightly irregular cases:
1839 switch (klass_id) {
1840 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1841 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1842 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1843 if (!is_native()) break;
1844 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1845 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1846 id = vmIntrinsics::_none;
1847 break;
1848
1849 default:
1850 break;
1851 }
1852
1853 if (id != vmIntrinsics::_none) {
1854 // Set up its iid. It is an alias method.
1855 set_intrinsic_id(id);
1856 return;
1857 }
1858 }
1859
1860 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1861 if (!THREAD->can_call_java()) {
1862 // There is nothing useful this routine can do from within the Compile thread.
1863 // Hopefully, the signature contains only well-known classes.
1864 // We could scan for this and return true/false, but the caller won't care.
1865 return false;
1866 }
1867 bool sig_is_loaded = true;
1868 ResourceMark rm(THREAD);
1869 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1870 if (ss.is_reference()) {
1871 // load everything, including arrays "[Lfoo;"
1872 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1873 // We are loading classes eagerly. If a ClassNotFoundException or
1874 // a LinkageError was generated, be sure to ignore it.
1875 if (HAS_PENDING_EXCEPTION) {
1876 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1877 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1878 CLEAR_PENDING_EXCEPTION;
1879 } else {
1880 return false;
1881 }
1882 }
1883 if( klass == nullptr) { sig_is_loaded = false; }
1884 }
1885 }
1886 return sig_is_loaded;
1887 }
1888
1889 // Exposed so field engineers can debug VM
1890 void Method::print_short_name(outputStream* st) const {
1891 ResourceMark rm;
1892 #ifdef PRODUCT
1893 st->print(" %s::", method_holder()->external_name());
1894 #else
1895 st->print(" %s::", method_holder()->internal_name());
1896 #endif
1897 name()->print_symbol_on(st);
1898 if (WizardMode) signature()->print_symbol_on(st);
1899 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1900 MethodHandles::print_as_basic_type_signature_on(st, signature());
1901 }
1902
1903 // Comparer for sorting an object array containing
1904 // Method*s.
1905 static int method_comparator(Method* a, Method* b) {
1906 return a->name()->fast_compare(b->name());
1907 }
1908
1909 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1910 // default_methods also uses this without the ordering for fast find_method
1911 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1912 int length = methods->length();
1913 if (length > 1) {
1914 if (func == nullptr) {
1915 func = method_comparator;
1916 }
1917 {
1918 NoSafepointVerifier nsv;
1919 QuickSort::sort(methods->data(), length, func);
1920 }
1921 // Reset method ordering
1922 if (set_idnums) {
1923 for (u2 i = 0; i < length; i++) {
1924 Method* m = methods->at(i);
1925 m->set_method_idnum(i);
1926 m->set_orig_method_idnum(i);
1927 }
1928 }
1929 }
1930 }
1931
1932 //-----------------------------------------------------------------------------------
1933 // Non-product code unless JVM/TI needs it
1934
1935 #if !defined(PRODUCT) || INCLUDE_JVMTI
1936 class SignatureTypePrinter : public SignatureTypeNames {
1937 private:
1938 outputStream* _st;
1939 bool _use_separator;
1940
1941 void type_name(const char* name) {
1942 if (_use_separator) _st->print(", ");
1943 _st->print("%s", name);
1944 _use_separator = true;
1945 }
1946
1947 public:
1948 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1949 _st = st;
1950 _use_separator = false;
1951 }
1952
1953 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1954 void print_returntype() { _use_separator = false; do_type(return_type()); }
1955 };
1956
1957
1958 void Method::print_name(outputStream* st) const {
1959 Thread *thread = Thread::current();
1960 ResourceMark rm(thread);
1961 st->print("%s ", is_static() ? "static" : "virtual");
1962 if (WizardMode) {
1963 st->print("%s.", method_holder()->internal_name());
1964 name()->print_symbol_on(st);
1965 signature()->print_symbol_on(st);
1966 } else {
1967 SignatureTypePrinter sig(signature(), st);
1968 sig.print_returntype();
1969 st->print(" %s.", method_holder()->internal_name());
1970 name()->print_symbol_on(st);
1971 st->print("(");
1972 sig.print_parameters();
1973 st->print(")");
1974 }
1975 }
1976 #endif // !PRODUCT || INCLUDE_JVMTI
1977
1978
1979 void Method::print_codes_on(outputStream* st, int flags, bool buffered) const {
1980 print_codes_on(0, code_size(), st, flags, buffered);
1981 }
1982
1983 void Method::print_codes_on(int from, int to, outputStream* st, int flags, bool buffered) const {
1984 Thread *thread = Thread::current();
1985 ResourceMark rm(thread);
1986 methodHandle mh (thread, (Method*)this);
1987 BytecodeTracer::print_method_codes(mh, from, to, st, flags, buffered);
1988 }
1989
1990 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1991 _bci = 0;
1992 _line = 0;
1993 };
1994
1995 bool CompressedLineNumberReadStream::read_pair() {
1996 jubyte next = read_byte();
1997 // Check for terminator
1998 if (next == 0) return false;
1999 if (next == 0xFF) {
2000 // Escape character, regular compression used
2001 _bci += read_signed_int();
2002 _line += read_signed_int();
2003 } else {
2004 // Single byte compression used
2005 _bci += next >> 3;
2006 _line += next & 0x7;
2007 }
2008 return true;
2009 }
2010
2011 #if INCLUDE_JVMTI
2012
2013 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
2014 BreakpointInfo* bp = method_holder()->breakpoints();
2015 for (; bp != nullptr; bp = bp->next()) {
2016 if (bp->match(this, bci)) {
2017 return bp->orig_bytecode();
2018 }
2019 }
2020 {
2021 ResourceMark rm;
2022 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
2023 }
2024 return Bytecodes::_shouldnotreachhere;
2025 }
2026
2027 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
2028 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
2029 BreakpointInfo* bp = method_holder()->breakpoints();
2030 for (; bp != nullptr; bp = bp->next()) {
2031 if (bp->match(this, bci)) {
2032 bp->set_orig_bytecode(code);
2033 // and continue, in case there is more than one
2034 }
2035 }
2036 }
2037
2038 void Method::set_breakpoint(int bci) {
2039 InstanceKlass* ik = method_holder();
2040 BreakpointInfo *bp = new BreakpointInfo(this, bci);
2041 bp->set_next(ik->breakpoints());
2042 ik->set_breakpoints(bp);
2043 // do this last:
2044 bp->set(this);
2045 }
2046
2047 static void clear_matches(Method* m, int bci) {
2048 InstanceKlass* ik = m->method_holder();
2049 BreakpointInfo* prev_bp = nullptr;
2050 BreakpointInfo* next_bp;
2051 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
2052 next_bp = bp->next();
2053 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
2054 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
2055 // do this first:
2056 bp->clear(m);
2057 // unhook it
2058 if (prev_bp != nullptr)
2059 prev_bp->set_next(next_bp);
2060 else
2061 ik->set_breakpoints(next_bp);
2062 delete bp;
2063 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
2064 // at same location. So we have multiple matching (method_index and bci)
2065 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
2066 // breakpoint for clear_breakpoint request and keep all other method versions
2067 // BreakpointInfo for future clear_breakpoint request.
2068 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
2069 // which is being called when class is unloaded. We delete all the Breakpoint
2070 // information for all versions of method. We may not correctly restore the original
2071 // bytecode in all method versions, but that is ok. Because the class is being unloaded
2072 // so these methods won't be used anymore.
2073 if (bci >= 0) {
2074 break;
2075 }
2076 } else {
2077 // This one is a keeper.
2078 prev_bp = bp;
2079 }
2080 }
2081 }
2082
2083 void Method::clear_breakpoint(int bci) {
2084 assert(bci >= 0, "");
2085 clear_matches(this, bci);
2086 }
2087
2088 void Method::clear_all_breakpoints() {
2089 clear_matches(this, -1);
2090 }
2091
2092 #endif // INCLUDE_JVMTI
2093
2094 int Method::highest_osr_comp_level() const {
2095 const MethodCounters* mcs = method_counters();
2096 if (mcs != nullptr) {
2097 return mcs->highest_osr_comp_level();
2098 } else {
2099 return CompLevel_none;
2100 }
2101 }
2102
2103 void Method::set_highest_comp_level(int level) {
2104 MethodCounters* mcs = method_counters();
2105 if (mcs != nullptr) {
2106 mcs->set_highest_comp_level(level);
2107 }
2108 }
2109
2110 void Method::set_highest_osr_comp_level(int level) {
2111 MethodCounters* mcs = method_counters();
2112 if (mcs != nullptr) {
2113 mcs->set_highest_osr_comp_level(level);
2114 }
2115 }
2116
2117 #if INCLUDE_JVMTI
2118
2119 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2120 _bci = bci;
2121 _name_index = m->name_index();
2122 _signature_index = m->signature_index();
2123 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2124 if (_orig_bytecode == Bytecodes::_breakpoint)
2125 _orig_bytecode = m->orig_bytecode_at(_bci);
2126 _next = nullptr;
2127 }
2128
2129 void BreakpointInfo::set(Method* method) {
2130 #ifdef ASSERT
2131 {
2132 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2133 if (code == Bytecodes::_breakpoint)
2134 code = method->orig_bytecode_at(_bci);
2135 assert(orig_bytecode() == code, "original bytecode must be the same");
2136 }
2137 #endif
2138 Thread *thread = Thread::current();
2139 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2140 method->incr_number_of_breakpoints(thread);
2141 {
2142 // Deoptimize all dependents on this method
2143 HandleMark hm(thread);
2144 methodHandle mh(thread, method);
2145 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2146 }
2147 }
2148
2149 void BreakpointInfo::clear(Method* method) {
2150 *method->bcp_from(_bci) = orig_bytecode();
2151 assert(method->number_of_breakpoints() > 0, "must not go negative");
2152 method->decr_number_of_breakpoints(Thread::current());
2153 }
2154
2155 #endif // INCLUDE_JVMTI
2156
2157 // jmethodID handling
2158 // jmethodIDs are 64-bit integers that will never run out and are mapped in a table
2159 // to their Method and vice versa. If JNI code has access to stale jmethodID, this
2160 // wastes no memory but the Method* returned is null.
2161
2162 // Add a method id to the jmethod_ids
2163 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2164 // Have to add jmethod_ids() to class loader data thread-safely.
2165 // Also have to add the method to the InstanceKlass list safely, which the lock
2166 // protects as well.
2167 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2168 jmethodID jmid = JmethodIDTable::make_jmethod_id(m);
2169 assert(jmid != nullptr, "must be created");
2170
2171 // Add to growable array in CLD.
2172 cld->add_jmethod_id(jmid);
2173 return jmid;
2174 }
2175
2176 // This looks in the InstanceKlass cache, then calls back to make_jmethod_id if not found.
2177 jmethodID Method::jmethod_id() {
2178 return method_holder()->get_jmethod_id(this);
2179 }
2180
2181 // Get the Method out of the table given the method id.
2182 Method* Method::resolve_jmethod_id(jmethodID mid) {
2183 assert(mid != nullptr, "JNI method id should not be null");
2184 return JmethodIDTable::resolve_jmethod_id(mid);
2185 }
2186
2187 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2188 // Can't assert the method_holder is the same because the new method has the
2189 // scratch method holder.
2190 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2191 == new_method->method_holder()->class_loader() ||
2192 new_method->method_holder()->class_loader() == nullptr, // allow substitution to Unsafe method
2193 "changing to a different class loader");
2194 JmethodIDTable::change_method_associated_with_jmethod_id(jmid, new_method);
2195 }
2196
2197 // If there's a jmethodID for this method, clear the Method
2198 // but leave jmethodID for this method in the table.
2199 // It's deallocated with class unloading.
2200 void Method::clear_jmethod_id() {
2201 jmethodID mid = method_holder()->jmethod_id_or_null(this);
2202 if (mid != nullptr) {
2203 JmethodIDTable::clear_jmethod_id(mid, this);
2204 }
2205 }
2206
2207 bool Method::validate_jmethod_id(jmethodID mid) {
2208 Method* m = resolve_jmethod_id(mid);
2209 assert(m != nullptr, "should be called with non-null method");
2210 InstanceKlass* ik = m->method_holder();
2211 ClassLoaderData* cld = ik->class_loader_data();
2212 if (cld->jmethod_ids() == nullptr) return false;
2213 return (cld->jmethod_ids()->contains(mid));
2214 }
2215
2216 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2217 if (mid == nullptr) return nullptr;
2218 Method* o = resolve_jmethod_id(mid);
2219 if (o == nullptr) {
2220 return nullptr;
2221 }
2222 // Method should otherwise be valid. Assert for testing.
2223 assert(is_valid_method(o), "should be valid jmethodid");
2224 // If the method's class holder object is unreferenced, but not yet marked as
2225 // unloaded, we need to return null here too because after a safepoint, its memory
2226 // will be reclaimed.
2227 return o->method_holder()->is_loader_alive() ? o : nullptr;
2228 }
2229
2230 void Method::set_on_stack(const bool value) {
2231 // Set both the method itself and its constant pool. The constant pool
2232 // on stack means some method referring to it is also on the stack.
2233 constants()->set_on_stack(value);
2234
2235 bool already_set = on_stack_flag();
2236 set_on_stack_flag(value);
2237 if (value && !already_set) {
2238 MetadataOnStackMark::record(this);
2239 }
2240 }
2241
2242 void Method::record_gc_epoch() {
2243 // If any method is on the stack in continuations, none of them can be reclaimed,
2244 // so save the marking cycle to check for the whole class in the cpCache.
2245 // The cpCache is writeable.
2246 constants()->cache()->record_gc_epoch();
2247 }
2248
2249 bool Method::has_method_vptr(const void* ptr) {
2250 Method m;
2251 // This assumes that the vtbl pointer is the first word of a C++ object.
2252 return dereference_vptr(&m) == dereference_vptr(ptr);
2253 }
2254
2255 // Check that this pointer is valid by checking that the vtbl pointer matches
2256 bool Method::is_valid_method(const Method* m) {
2257 if (m == nullptr) {
2258 return false;
2259 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2260 // Quick sanity check on pointer.
2261 return false;
2262 } else if (!os::is_readable_range(m, m + 1)) {
2263 return false;
2264 } else if (m->in_aot_cache()) {
2265 return CppVtables::is_valid_shared_method(m);
2266 } else if (Metaspace::contains_non_shared(m)) {
2267 return has_method_vptr((const void*)m);
2268 } else {
2269 return false;
2270 }
2271 }
2272
2273 bool Method::is_scalarized_arg(int idx) const {
2274 if (!has_scalarized_args()) {
2275 return false;
2276 }
2277 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID
2278 int depth = 0;
2279 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2280 for (int i = 0; i < sig->length(); i++) {
2281 BasicType bt = sig->at(i)._bt;
2282 if (bt == T_METADATA) {
2283 depth++;
2284 }
2285 if (idx == 0) {
2286 break; // Argument found
2287 }
2288 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2289 depth--;
2290 }
2291 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2292 idx--; // Advance to next argument
2293 }
2294 }
2295 return depth != 0;
2296 }
2297
2298 bool Method::is_scalarized_buffer_arg(int idx) const {
2299 if (!has_scalarized_args()) {
2300 return false;
2301 }
2302 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID
2303 int depth = 0;
2304 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2305 for (int i = 0; i < sig->length(); i++) {
2306 BasicType bt = sig->at(i)._bt;
2307 if (bt == T_METADATA) {
2308 depth++;
2309 continue;
2310 }
2311 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2312 depth--;
2313 continue;
2314 }
2315 if (idx == 0) {
2316 if (sig->at(i)._vt_oop) {
2317 assert(depth == 1, "only for root value");
2318 return true;
2319 }
2320 break; // Argument found
2321 }
2322 idx--; // Advance to next argument
2323 }
2324 return false;
2325 }
2326
2327 // Printing
2328
2329 #ifndef PRODUCT
2330
2331 void Method::print_on(outputStream* st) const {
2332 ResourceMark rm;
2333 assert(is_method(), "must be method");
2334 st->print_cr("%s", internal_name());
2335 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2336 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2337 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2338 constants()->print_value_on(st); st->cr();
2339 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr();
2340 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2341 st->print (" - name: "); name()->print_value_on(st); st->cr();
2342 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2343 st->print_cr(" - max stack: %d", max_stack());
2344 st->print_cr(" - max locals: %d", max_locals());
2345 st->print_cr(" - size of params: %d", size_of_parameters());
2346 st->print_cr(" - method size: %d", method_size());
2347 if (intrinsic_id() != vmIntrinsics::_none)
2348 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2349 if (highest_comp_level() != CompLevel_none)
2350 st->print_cr(" - highest level: %d", highest_comp_level());
2351 st->print_cr(" - vtable index: %d", _vtable_index);
2352 #ifdef ASSERT
2353 if (valid_itable_index())
2354 st->print_cr(" - itable index: %d", itable_index());
2355 #endif
2356 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2357 st->print( " - adapters: ");
2358 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2359 if (a == nullptr)
2360 st->print_cr(PTR_FORMAT, p2i(a));
2361 else
2362 a->print_adapter_on(st);
2363 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2364 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2365 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_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 if (WizardMode) access_flags().print_on(st);
2436 name()->print_value_on(st);
2437 st->print(" ");
2438 signature()->print_value_on(st);
2439 st->print(" in ");
2440 method_holder()->print_value_on(st);
2441 if (WizardMode) st->print("#%d", _vtable_index);
2442 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2443 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2444 }
2445
2446 // Verification
2447
2448 void Method::verify_on(outputStream* st) {
2449 guarantee(is_method(), "object must be method");
2450 guarantee(constants()->is_constantPool(), "should be constant pool");
2451 MethodData* md = method_data();
2452 guarantee(md == nullptr ||
2453 md->is_methodData(), "should be method data");
2454 }