1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/cdsConfig.hpp"
26 #include "cds/cppVtables.hpp"
27 #include "cds/metaspaceShared.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderDataGraph.hpp"
30 #include "classfile/metadataOnStackMark.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmClasses.hpp"
34 #include "code/aotCodeCache.hpp"
35 #include "code/codeCache.hpp"
36 #include "code/debugInfoRec.hpp"
37 #include "compiler/compilationPolicy.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecodeStream.hpp"
40 #include "interpreter/bytecodeTracer.hpp"
41 #include "interpreter/bytecodes.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "logging/logTag.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/metadataFactory.hpp"
49 #include "memory/metaspaceClosure.hpp"
50 #include "memory/oopFactory.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "memory/universe.hpp"
53 #include "nmt/memTracker.hpp"
54 #include "oops/constMethod.hpp"
55 #include "oops/constantPool.hpp"
56 #include "oops/klass.inline.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/methodData.hpp"
59 #include "oops/objArrayKlass.hpp"
60 #include "oops/objArrayOop.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/symbol.hpp"
63 #include "oops/trainingData.hpp"
64 #include "prims/jvmtiExport.hpp"
65 #include "prims/methodHandles.hpp"
66 #include "runtime/atomic.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/continuationEntry.hpp"
69 #include "runtime/frame.inline.hpp"
70 #include "runtime/handles.inline.hpp"
71 #include "runtime/init.hpp"
72 #include "runtime/java.hpp"
73 #include "runtime/orderAccess.hpp"
74 #include "runtime/perfData.hpp"
75 #include "runtime/relocator.hpp"
76 #include "runtime/safepointVerifiers.hpp"
77 #include "runtime/sharedRuntime.hpp"
78 #include "runtime/signature.hpp"
79 #include "runtime/threads.hpp"
80 #include "runtime/vm_version.hpp"
81 #include "utilities/align.hpp"
82 #include "utilities/quickSort.hpp"
83 #include "utilities/vmError.hpp"
84 #include "utilities/xmlstream.hpp"
85
86 // Implementation of Method
87
88 Method* Method::allocate(ClassLoaderData* loader_data,
89 int byte_code_size,
90 AccessFlags access_flags,
91 InlineTableSizes* sizes,
92 ConstMethod::MethodType method_type,
93 Symbol* name,
94 TRAPS) {
95 assert(!access_flags.is_native() || byte_code_size == 0,
96 "native methods should not contain byte codes");
97 ConstMethod* cm = ConstMethod::allocate(loader_data,
98 byte_code_size,
99 sizes,
100 method_type,
101 CHECK_NULL);
102 int size = Method::size(access_flags.is_native());
103 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
104 }
105
106 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
107 NoSafepointVerifier no_safepoint;
108 set_constMethod(xconst);
109 set_access_flags(access_flags);
110 set_intrinsic_id(vmIntrinsics::_none);
111 clear_method_data();
112 clear_method_counters();
113 set_vtable_index(Method::garbage_vtable_index);
114
115 // Fix and bury in Method*
116 set_interpreter_entry(nullptr); // sets i2i entry and from_int
117 set_adapter_entry(nullptr);
118 Method::clear_code(); // from_c/from_i get set to c2i/i2i
119
120 if (access_flags.is_native()) {
121 clear_native_function();
122 set_signature_handler(nullptr);
123 }
124
125 NOT_PRODUCT(set_compiled_invocation_count(0);)
126 // Name is very useful for debugging.
127 NOT_PRODUCT(_name = name;)
128 }
129
130 // Release Method*. The nmethod will be gone when we get here because
131 // we've walked the code cache.
132 void Method::deallocate_contents(ClassLoaderData* loader_data) {
133 MetadataFactory::free_metadata(loader_data, constMethod());
134 set_constMethod(nullptr);
135 MetadataFactory::free_metadata(loader_data, method_data());
136 clear_method_data();
137 MetadataFactory::free_metadata(loader_data, method_counters());
138 clear_method_counters();
139 set_adapter_entry(nullptr);
140 // The nmethod will be gone when we get here.
141 if (code() != nullptr) _code = nullptr;
142 }
143
144 void Method::release_C_heap_structures() {
145 if (method_data()) {
146 method_data()->release_C_heap_structures();
147
148 // Destroy MethodData embedded lock
149 method_data()->~MethodData();
150 }
151 }
152
153 address Method::get_i2c_entry() {
154 assert(adapter() != nullptr, "must have");
155 return adapter()->get_i2c_entry();
156 }
157
158 address Method::get_c2i_entry() {
159 assert(adapter() != nullptr, "must have");
160 return adapter()->get_c2i_entry();
161 }
162
163 address Method::get_c2i_unverified_entry() {
164 assert(adapter() != nullptr, "must have");
165 return adapter()->get_c2i_unverified_entry();
166 }
167
168 address Method::get_c2i_no_clinit_check_entry() {
169 assert(VM_Version::supports_fast_class_init_checks(), "");
170 assert(adapter() != nullptr, "must have");
171 return adapter()->get_c2i_no_clinit_check_entry();
172 }
173
174 char* Method::name_and_sig_as_C_string() const {
175 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
176 }
177
178 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
179 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
180 }
181
182 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
183 const char* klass_name = klass->external_name();
184 int klass_name_len = (int)strlen(klass_name);
185 int method_name_len = method_name->utf8_length();
186 int len = klass_name_len + 2 + method_name_len + signature->utf8_length();
187 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
188 strcpy(dest, klass_name);
189 dest[klass_name_len + 0] = ':';
190 dest[klass_name_len + 1] = ':';
191 strcpy(&dest[klass_name_len + 2], method_name->as_C_string());
192 strcpy(&dest[klass_name_len + 2 + method_name_len], signature->as_C_string());
193 dest[len] = 0;
194 return dest;
195 }
196
197 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
198 Symbol* klass_name = klass->name();
199 klass_name->as_klass_external_name(buf, size);
200 int len = (int)strlen(buf);
201
202 if (len < size - 1) {
203 buf[len++] = '.';
204
205 method_name->as_C_string(&(buf[len]), size - len);
206 len = (int)strlen(buf);
207
208 signature->as_C_string(&(buf[len]), size - len);
209 }
210
211 return buf;
212 }
213
214 const char* Method::external_name() const {
215 return external_name(constants()->pool_holder(), name(), signature());
216 }
217
218 void Method::print_external_name(outputStream *os) const {
219 print_external_name(os, constants()->pool_holder(), name(), signature());
220 }
221
222 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
223 stringStream ss;
224 print_external_name(&ss, klass, method_name, signature);
225 return ss.as_string();
226 }
227
228 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
229 signature->print_as_signature_external_return_type(os);
230 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
231 signature->print_as_signature_external_parameters(os);
232 os->print(")");
233 }
234
235 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
236 if (log_is_enabled(Debug, exceptions)) {
237 ResourceMark rm(THREAD);
238 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
239 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
240 }
241 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
242 // access exception table
243 ExceptionTable table(mh());
244 int length = table.length();
245 // iterate through all entries sequentially
246 constantPoolHandle pool(THREAD, mh->constants());
247 for (int i = 0; i < length; i ++) {
248 //reacquire the table in case a GC happened
249 ExceptionTable table(mh());
250 int beg_bci = table.start_pc(i);
251 int end_bci = table.end_pc(i);
252 assert(beg_bci <= end_bci, "inconsistent exception table");
253 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
254 beg_bci, end_bci);
255
256 if (beg_bci <= throw_bci && throw_bci < end_bci) {
257 // exception handler bci range covers throw_bci => investigate further
258 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
259
260 int handler_bci = table.handler_pc(i);
261 int klass_index = table.catch_type_index(i);
262 if (klass_index == 0) {
263 if (log_is_enabled(Info, exceptions)) {
264 ResourceMark rm(THREAD);
265 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
266 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
267 }
268 return handler_bci;
269 } else if (ex_klass == nullptr) {
270 // Is this even possible?
271 if (log_is_enabled(Info, exceptions)) {
272 ResourceMark rm(THREAD);
273 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
274 mh()->name()->as_C_string(), handler_bci);
275 }
276 return handler_bci;
277 } else {
278 if (log_is_enabled(Debug, exceptions)) {
279 ResourceMark rm(THREAD);
280 log_debug(exceptions)(" - resolving catch type \"%s\"",
281 pool->klass_name_at(klass_index)->as_C_string());
282 }
283 // we know the exception class => get the constraint class
284 // this may require loading of the constraint class; if verification
285 // fails or some other exception occurs, return handler_bci
286 Klass* k = pool->klass_at(klass_index, THREAD);
287 if (HAS_PENDING_EXCEPTION) {
288 if (log_is_enabled(Debug, exceptions)) {
289 ResourceMark rm(THREAD);
290 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
291 PENDING_EXCEPTION->klass()->external_name());
292 }
293 return handler_bci;
294 }
295 assert(k != nullptr, "klass not loaded");
296 if (ex_klass->is_subtype_of(k)) {
297 if (log_is_enabled(Info, exceptions)) {
298 ResourceMark rm(THREAD);
299 log_info(exceptions)("Found matching 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 }
304 }
305 }
306 }
307
308 if (log_is_enabled(Debug, exceptions)) {
309 ResourceMark rm(THREAD);
310 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
311 ex_klass->external_name(), mh->name()->as_C_string());
312 }
313
314 return -1;
315 }
316
317 void Method::mask_for(int bci, InterpreterOopMap* mask) {
318 methodHandle h_this(Thread::current(), this);
319 mask_for(h_this, bci, mask);
320 }
321
322 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
323 assert(this_mh() == this, "Sanity");
324 method_holder()->mask_for(this_mh, bci, mask);
325 }
326
327 int Method::bci_from(address bcp) const {
328 if (is_native() && bcp == nullptr) {
329 return 0;
330 }
331 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
332 // may call this after interrupting a nested ResourceMark.
333 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
334 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
335
336 return int(bcp - code_base());
337 }
338
339
340 int Method::validate_bci(int bci) const {
341 // Called from the verifier, and should return -1 if not valid.
342 return ((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size())) ? bci : -1;
343 }
344
345 // Return bci if it appears to be a valid bcp
346 // Return -1 otherwise.
347 // Used by profiling code, when invalid data is a possibility.
348 // The caller is responsible for validating the Method* itself.
349 int Method::validate_bci_from_bcp(address bcp) const {
350 // keep bci as -1 if not a valid bci
351 int bci = -1;
352 if (bcp == nullptr || bcp == code_base()) {
353 // code_size() may return 0 and we allow 0 here
354 // the method may be native
355 bci = 0;
356 } else if (contains(bcp)) {
357 bci = int(bcp - code_base());
358 }
359 // Assert that if we have dodged any asserts, bci is negative.
360 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
361 return bci;
362 }
363
364 address Method::bcp_from(int bci) const {
365 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
366 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
367 address bcp = code_base() + bci;
368 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
369 return bcp;
370 }
371
372 address Method::bcp_from(address bcp) const {
373 if (is_native() && bcp == nullptr) {
374 return code_base();
375 } else {
376 return bcp;
377 }
378 }
379
380 int Method::size(bool is_native) {
381 // If native, then include pointers for native_function and signature_handler
382 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
383 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
384 return align_metadata_size(header_size() + extra_words);
385 }
386
387 Symbol* Method::klass_name() const {
388 return method_holder()->name();
389 }
390
391 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
392 LogStreamHandle(Trace, aot) lsh;
393 if (lsh.is_enabled()) {
394 lsh.print("Iter(Method): %p ", this);
395 print_external_name(&lsh);
396 lsh.cr();
397 }
398 if (method_holder() != nullptr && !method_holder()->is_rewritten()) {
399 // holder is null for MH intrinsic methods
400 it->push(&_constMethod, MetaspaceClosure::_writable);
401 } else {
402 it->push(&_constMethod);
403 }
404 it->push(&_adapter);
405 it->push(&_method_data);
406 it->push(&_method_counters);
407 NOT_PRODUCT(it->push(&_name);)
408 }
409
410 #if INCLUDE_CDS
411 // Attempt to return method to original state. Clear any pointers
412 // (to objects outside the shared spaces). We won't be able to predict
413 // where they should point in a new JVM. Further initialize some
414 // entries now in order allow them to be write protected later.
415
416 void Method::remove_unshareable_info() {
417 unlink_method();
418 if (method_data() != nullptr) {
419 method_data()->remove_unshareable_info();
420 }
421 if (method_counters() != nullptr) {
422 method_counters()->remove_unshareable_info();
423 }
424 if (CDSConfig::is_dumping_adapters() && _adapter != nullptr) {
425 _adapter->remove_unshareable_info();
426 _adapter = nullptr;
427 }
428 if (method_data() != nullptr) {
429 method_data()->remove_unshareable_info();
430 }
431 if (method_counters() != nullptr) {
432 method_counters()->remove_unshareable_info();
433 }
434 JFR_ONLY(REMOVE_METHOD_ID(this);)
435 }
436
437 void Method::restore_unshareable_info(TRAPS) {
438 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
439 if (method_data() != nullptr) {
440 method_data()->restore_unshareable_info(CHECK);
441 }
442 if (method_counters() != nullptr) {
443 method_counters()->restore_unshareable_info(CHECK);
444 }
445 if (_adapter != nullptr) {
446 assert(_adapter->is_linked(), "must be");
447 _from_compiled_entry = _adapter->get_c2i_entry();
448 }
449 if (method_data() != nullptr) {
450 method_data()->restore_unshareable_info(CHECK);
451 }
452 if (method_counters() != nullptr) {
453 method_counters()->restore_unshareable_info(CHECK);
454 }
455 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
456 assert(!pending_queue_processed(), "method's pending_queued_processed flag should not be set");
457 }
458 #endif
459
460 void Method::set_vtable_index(int index) {
461 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
462 // At runtime initialize_vtable is rerun as part of link_class_impl()
463 // for a shared class loaded by the non-boot loader to obtain the loader
464 // constraints based on the runtime classloaders' context.
465 return; // don't write into the shared class
466 } else {
467 _vtable_index = index;
468 }
469 }
470
471 void Method::set_itable_index(int index) {
472 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
473 // At runtime initialize_itable is rerun as part of link_class_impl()
474 // for a shared class loaded by the non-boot loader to obtain the loader
475 // constraints based on the runtime classloaders' context. The dumptime
476 // itable index should be the same as the runtime index.
477 assert(_vtable_index == itable_index_max - index,
478 "archived itable index is different from runtime index");
479 return; // don't write into the shared class
480 } else {
481 _vtable_index = itable_index_max - index;
482 }
483 assert(valid_itable_index(), "");
484 }
485
486 // The RegisterNatives call being attempted tried to register with a method that
487 // is not native. Ask JVM TI what prefixes have been specified. Then check
488 // to see if the native method is now wrapped with the prefixes. See the
489 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
490 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
491 #if INCLUDE_JVMTI
492 ResourceMark rm(THREAD);
493 Method* method;
494 int name_len = name->utf8_length();
495 char* name_str = name->as_utf8();
496 int prefix_count;
497 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
498 for (int i = 0; i < prefix_count; i++) {
499 char* prefix = prefixes[i];
500 int prefix_len = (int)strlen(prefix);
501
502 // try adding this prefix to the method name and see if it matches another method name
503 int trial_len = name_len + prefix_len;
504 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
505 strcpy(trial_name_str, prefix);
506 strcat(trial_name_str, name_str);
507 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
508 if (trial_name == nullptr) {
509 continue; // no such symbol, so this prefix wasn't used, try the next prefix
510 }
511 method = k->lookup_method(trial_name, signature);
512 if (method == nullptr) {
513 continue; // signature doesn't match, try the next prefix
514 }
515 if (method->is_native()) {
516 method->set_is_prefixed_native();
517 return method; // wahoo, we found a prefixed version of the method, return it
518 }
519 // found as non-native, so prefix is good, add it, probably just need more prefixes
520 name_len = trial_len;
521 name_str = trial_name_str;
522 }
523 #endif // INCLUDE_JVMTI
524 return nullptr; // not found
525 }
526
527 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
528 Method* method = k->lookup_method(name, signature);
529 if (method == nullptr) {
530 ResourceMark rm(THREAD);
531 stringStream st;
532 st.print("Method '");
533 print_external_name(&st, k, name, signature);
534 st.print("' name or signature does not match");
535 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
536 }
537 if (!method->is_native()) {
538 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
539 method = find_prefixed_native(k, name, signature, THREAD);
540 if (method == nullptr) {
541 ResourceMark rm(THREAD);
542 stringStream st;
543 st.print("Method '");
544 print_external_name(&st, k, name, signature);
545 st.print("' is not declared as native");
546 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
547 }
548 }
549
550 if (entry != nullptr) {
551 method->set_native_function(entry, native_bind_event_is_interesting);
552 } else {
553 method->clear_native_function();
554 }
555 if (log_is_enabled(Debug, jni, resolve)) {
556 ResourceMark rm(THREAD);
557 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
558 method->method_holder()->external_name(),
559 method->name()->as_C_string());
560 }
561 return true;
562 }
563
564 bool Method::was_executed_more_than(int n) {
565 // Invocation counter is reset when the Method* is compiled.
566 // If the method has compiled code we therefore assume it has
567 // be executed more than n times.
568 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
569 // interpreter doesn't bump invocation counter of trivial methods
570 // compiler does not bump invocation counter of compiled methods
571 return true;
572 }
573 else if ((method_counters() != nullptr &&
574 method_counters()->invocation_counter()->carry()) ||
575 (method_data() != nullptr &&
576 method_data()->invocation_counter()->carry())) {
577 // The carry bit is set when the counter overflows and causes
578 // a compilation to occur. We don't know how many times
579 // the counter has been reset, so we simply assume it has
580 // been executed more than n times.
581 return true;
582 } else {
583 return invocation_count() > n;
584 }
585 }
586
587 void Method::print_invocation_count(outputStream* st) {
588 //---< compose+print method return type, klass, name, and signature >---
589 if (is_static()) { st->print("static "); }
590 if (is_final()) { st->print("final "); }
591 if (is_synchronized()) { st->print("synchronized "); }
592 if (is_native()) { st->print("native "); }
593 st->print("%s::", method_holder()->external_name());
594 name()->print_symbol_on(st);
595 signature()->print_symbol_on(st);
596
597 if (WizardMode) {
598 // dump the size of the byte codes
599 st->print(" {%d}", code_size());
600 }
601 st->cr();
602
603 // Counting based on signed int counters tends to overflow with
604 // longer-running workloads on fast machines. The counters under
605 // consideration here, however, are limited in range by counting
606 // logic. See InvocationCounter:count_limit for example.
607 // No "overflow precautions" need to be implemented here.
608 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
609 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
610 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
611
612 if (method_data() != nullptr) {
613 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
614 }
615
616 #ifndef PRODUCT
617 if (CountCompiledCalls) {
618 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
619 }
620 #endif
621 }
622
623 MethodTrainingData* Method::training_data_or_null() const {
624 MethodCounters* mcs = method_counters();
625 if (mcs == nullptr) {
626 return nullptr;
627 } else {
628 MethodTrainingData* mtd = mcs->method_training_data();
629 if (mtd == mcs->method_training_data_sentinel()) {
630 return nullptr;
631 }
632 return mtd;
633 }
634 }
635
636 bool Method::init_training_data(MethodTrainingData* td) {
637 MethodCounters* mcs = method_counters();
638 if (mcs == nullptr) {
639 return false;
640 } else {
641 return mcs->init_method_training_data(td);
642 }
643 }
644
645 bool Method::install_training_method_data(const methodHandle& method) {
646 MethodTrainingData* mtd = MethodTrainingData::find(method);
647 if (mtd != nullptr && mtd->final_profile() != nullptr) {
648 Atomic::replace_if_null(&method->_method_data, mtd->final_profile());
649 return true;
650 }
651 return false;
652 }
653
654 // Build a MethodData* object to hold profiling information collected on this
655 // method when requested.
656 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
657 if (install_training_method_data(method)) {
658 return;
659 }
660 // Do not profile the method if metaspace has hit an OOM previously
661 // allocating profiling data. Callers clear pending exception so don't
662 // add one here.
663 if (ClassLoaderDataGraph::has_metaspace_oom()) {
664 return;
665 }
666
667 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
668 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
669 if (HAS_PENDING_EXCEPTION) {
670 CompileBroker::log_metaspace_failure();
671 ClassLoaderDataGraph::set_metaspace_oom(true);
672 return; // return the exception (which is cleared)
673 }
674
675 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
676 MetadataFactory::free_metadata(loader_data, method_data);
677 return;
678 }
679
680 if (ForceProfiling && TrainingData::need_data()) {
681 MethodTrainingData* mtd = MethodTrainingData::make(method, false);
682 guarantee(mtd != nullptr, "");
683 }
684
685 if (PrintMethodData) {
686 ResourceMark rm(THREAD);
687 tty->print("build_profiling_method_data for ");
688 method->print_name(tty);
689 tty->cr();
690 // At the end of the run, the MDO, full of data, will be dumped.
691 }
692 }
693
694 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
695 // Do not profile the method if metaspace has hit an OOM previously
696 if (ClassLoaderDataGraph::has_metaspace_oom()) {
697 return nullptr;
698 }
699
700 methodHandle mh(current, m);
701 MethodCounters* counters;
702 if (current->is_Java_thread()) {
703 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
704 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
705 // if needed.
706 counters = MethodCounters::allocate_with_exception(mh, THREAD);
707 if (HAS_PENDING_EXCEPTION) {
708 CLEAR_PENDING_EXCEPTION;
709 }
710 } else {
711 // Call metaspace allocation that doesn't throw exception if the
712 // current thread isn't a JavaThread, ie. the VMThread.
713 counters = MethodCounters::allocate_no_exception(mh);
714 }
715
716 if (counters == nullptr) {
717 CompileBroker::log_metaspace_failure();
718 ClassLoaderDataGraph::set_metaspace_oom(true);
719 return nullptr;
720 }
721
722 if (!mh->init_method_counters(counters)) {
723 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
724 }
725
726 if (ForceProfiling && TrainingData::need_data()) {
727 MethodTrainingData* mtd = MethodTrainingData::make(mh, false);
728 guarantee(mtd != nullptr, "");
729 }
730
731 return mh->method_counters();
732 }
733
734 bool Method::init_method_counters(MethodCounters* counters) {
735 // Try to install a pointer to MethodCounters, return true on success.
736 return Atomic::replace_if_null(&_method_counters, counters);
737 }
738
739 void Method::set_exception_handler_entered(int handler_bci) {
740 if (ProfileExceptionHandlers) {
741 MethodData* mdo = method_data();
742 if (mdo != nullptr) {
743 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
744 handler_data.set_exception_handler_entered();
745 }
746 }
747 }
748
749 int Method::extra_stack_words() {
750 // not an inline function, to avoid a header dependency on Interpreter
751 return extra_stack_entries() * Interpreter::stackElementSize;
752 }
753
754 bool Method::compute_has_loops_flag() {
755 BytecodeStream bcs(methodHandle(Thread::current(), this));
756 Bytecodes::Code bc;
757
758 while ((bc = bcs.next()) >= 0) {
759 switch (bc) {
760 case Bytecodes::_ifeq:
761 case Bytecodes::_ifnull:
762 case Bytecodes::_iflt:
763 case Bytecodes::_ifle:
764 case Bytecodes::_ifne:
765 case Bytecodes::_ifnonnull:
766 case Bytecodes::_ifgt:
767 case Bytecodes::_ifge:
768 case Bytecodes::_if_icmpeq:
769 case Bytecodes::_if_icmpne:
770 case Bytecodes::_if_icmplt:
771 case Bytecodes::_if_icmpgt:
772 case Bytecodes::_if_icmple:
773 case Bytecodes::_if_icmpge:
774 case Bytecodes::_if_acmpeq:
775 case Bytecodes::_if_acmpne:
776 case Bytecodes::_goto:
777 case Bytecodes::_jsr:
778 if (bcs.dest() < bcs.next_bci()) {
779 return set_has_loops();
780 }
781 break;
782
783 case Bytecodes::_goto_w:
784 case Bytecodes::_jsr_w:
785 if (bcs.dest_w() < bcs.next_bci()) {
786 return set_has_loops();
787 }
788 break;
789
790 case Bytecodes::_lookupswitch: {
791 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
792 if (lookupswitch.default_offset() < 0) {
793 return set_has_loops();
794 } else {
795 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
796 LookupswitchPair pair = lookupswitch.pair_at(i);
797 if (pair.offset() < 0) {
798 return set_has_loops();
799 }
800 }
801 }
802 break;
803 }
804 case Bytecodes::_tableswitch: {
805 Bytecode_tableswitch tableswitch(this, bcs.bcp());
806 if (tableswitch.default_offset() < 0) {
807 return set_has_loops();
808 } else {
809 for (int i = 0; i < tableswitch.length(); ++i) {
810 if (tableswitch.dest_offset_at(i) < 0) {
811 return set_has_loops();
812 }
813 }
814 }
815 break;
816 }
817 default:
818 break;
819 }
820 }
821
822 _flags.set_has_loops_flag_init(true);
823 return false;
824 }
825
826 bool Method::is_final_method(AccessFlags class_access_flags) const {
827 // or "does_not_require_vtable_entry"
828 // default method or overpass can occur, is not final (reuses vtable entry)
829 // private methods in classes get vtable entries for backward class compatibility.
830 if (is_overpass() || is_default_method()) return false;
831 return is_final() || class_access_flags.is_final();
832 }
833
834 bool Method::is_final_method() const {
835 return is_final_method(method_holder()->access_flags());
836 }
837
838 bool Method::is_default_method() const {
839 if (method_holder() != nullptr &&
840 method_holder()->is_interface() &&
841 !is_abstract() && !is_private()) {
842 return true;
843 } else {
844 return false;
845 }
846 }
847
848 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
849 if (is_final_method(class_access_flags)) return true;
850 #ifdef ASSERT
851 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
852 if (class_access_flags.is_interface()) {
853 ResourceMark rm;
854 assert(is_nonv == is_static() || is_nonv == is_private(),
855 "nonvirtual unexpected for non-static, non-private: %s",
856 name_and_sig_as_C_string());
857 }
858 #endif
859 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
860 return vtable_index() == nonvirtual_vtable_index;
861 }
862
863 bool Method::can_be_statically_bound() const {
864 return can_be_statically_bound(method_holder()->access_flags());
865 }
866
867 bool Method::can_be_statically_bound(InstanceKlass* context) const {
868 return (method_holder() == context) && can_be_statically_bound();
869 }
870
871 /**
872 * Returns false if this is one of specially treated methods for
873 * which we have to provide stack trace in throw in compiled code.
874 * Returns true otherwise.
875 */
876 bool Method::can_omit_stack_trace() {
877 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
878 return false; // All methods in sun.invoke.util.ValueConversions
879 }
880 return true;
881 }
882
883 bool Method::is_accessor() const {
884 return is_getter() || is_setter();
885 }
886
887 bool Method::is_getter() const {
888 if (code_size() != 5) return false;
889 if (size_of_parameters() != 1) return false;
890 if (java_code_at(0) != Bytecodes::_aload_0) return false;
891 if (java_code_at(1) != Bytecodes::_getfield) return false;
892 switch (java_code_at(4)) {
893 case Bytecodes::_ireturn:
894 case Bytecodes::_lreturn:
895 case Bytecodes::_freturn:
896 case Bytecodes::_dreturn:
897 case Bytecodes::_areturn:
898 break;
899 default:
900 return false;
901 }
902 return true;
903 }
904
905 bool Method::is_setter() const {
906 if (code_size() != 6) return false;
907 if (java_code_at(0) != Bytecodes::_aload_0) return false;
908 switch (java_code_at(1)) {
909 case Bytecodes::_iload_1:
910 case Bytecodes::_aload_1:
911 case Bytecodes::_fload_1:
912 if (size_of_parameters() != 2) return false;
913 break;
914 case Bytecodes::_dload_1:
915 case Bytecodes::_lload_1:
916 if (size_of_parameters() != 3) return false;
917 break;
918 default:
919 return false;
920 }
921 if (java_code_at(2) != Bytecodes::_putfield) return false;
922 if (java_code_at(5) != Bytecodes::_return) return false;
923 return true;
924 }
925
926 bool Method::is_constant_getter() const {
927 int last_index = code_size() - 1;
928 // Check if the first 1-3 bytecodes are a constant push
929 // and the last bytecode is a return.
930 return (2 <= code_size() && code_size() <= 4 &&
931 Bytecodes::is_const(java_code_at(0)) &&
932 Bytecodes::length_for(java_code_at(0)) == last_index &&
933 Bytecodes::is_return(java_code_at(last_index)));
934 }
935
936 bool Method::has_valid_initializer_flags() const {
937 return (is_static() ||
938 method_holder()->major_version() < 51);
939 }
940
941 bool Method::is_static_initializer() const {
942 // For classfiles version 51 or greater, ensure that the clinit method is
943 // static. Non-static methods with the name "<clinit>" are not static
944 // initializers. (older classfiles exempted for backward compatibility)
945 return name() == vmSymbols::class_initializer_name() &&
946 has_valid_initializer_flags();
947 }
948
949 bool Method::is_object_initializer() const {
950 return name() == vmSymbols::object_initializer_name();
951 }
952
953 bool Method::needs_clinit_barrier() const {
954 return is_static() && !method_holder()->is_initialized();
955 }
956
957 bool Method::code_has_clinit_barriers() const {
958 nmethod* nm = code();
959 return (nm != nullptr) && nm->has_clinit_barriers();
960 }
961
962 bool Method::is_object_wait0() const {
963 return klass_name() == vmSymbols::java_lang_Object()
964 && name() == vmSymbols::wait_name();
965 }
966
967 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
968 int length = method->checked_exceptions_length();
969 if (length == 0) { // common case
970 return objArrayHandle(THREAD, Universe::the_empty_class_array());
971 } else {
972 methodHandle h_this(THREAD, method);
973 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
974 objArrayHandle mirrors (THREAD, m_oop);
975 for (int i = 0; i < length; i++) {
976 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
977 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
978 if (log_is_enabled(Warning, exceptions) &&
979 !k->is_subclass_of(vmClasses::Throwable_klass())) {
980 ResourceMark rm(THREAD);
981 log_warning(exceptions)(
982 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
983 k->external_name(), method->external_name());
984 }
985 mirrors->obj_at_put(i, k->java_mirror());
986 }
987 return mirrors;
988 }
989 };
990
991
992 int Method::line_number_from_bci(int bci) const {
993 int best_bci = 0;
994 int best_line = -1;
995 if (bci == SynchronizationEntryBCI) bci = 0;
996 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
997 // The line numbers are a short array of 2-tuples [start_pc, line_number].
998 // Not necessarily sorted and not necessarily one-to-one.
999 CompressedLineNumberReadStream stream(compressed_linenumber_table());
1000 while (stream.read_pair()) {
1001 if (stream.bci() == bci) {
1002 // perfect match
1003 return stream.line();
1004 } else {
1005 // update best_bci/line
1006 if (stream.bci() < bci && stream.bci() >= best_bci) {
1007 best_bci = stream.bci();
1008 best_line = stream.line();
1009 }
1010 }
1011 }
1012 }
1013 return best_line;
1014 }
1015
1016
1017 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1018 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
1019 Thread *thread = Thread::current();
1020 Symbol* klass_name = constants()->klass_name_at(klass_index);
1021 Handle loader(thread, method_holder()->class_loader());
1022 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr;
1023 } else {
1024 return true;
1025 }
1026 }
1027
1028
1029 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1030 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1031 if (must_be_resolved) {
1032 // Make sure klass is resolved in constantpool.
1033 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
1034 }
1035 return is_klass_loaded_by_klass_index(klass_index);
1036 }
1037
1038
1039 void Method::set_native_function(address function, bool post_event_flag) {
1040 assert(function != nullptr, "use clear_native_function to unregister natives");
1041 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1042 address* native_function = native_function_addr();
1043
1044 // We can see racers trying to place the same native function into place. Once
1045 // is plenty.
1046 address current = *native_function;
1047 if (current == function) return;
1048 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1049 function != nullptr) {
1050 // native_method_throw_unsatisfied_link_error_entry() should only
1051 // be passed when post_event_flag is false.
1052 assert(function !=
1053 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1054 "post_event_flag mismatch");
1055
1056 // post the bind event, and possible change the bind function
1057 JvmtiExport::post_native_method_bind(this, &function);
1058 }
1059 *native_function = function;
1060 // This function can be called more than once. We must make sure that we always
1061 // use the latest registered method -> check if a stub already has been generated.
1062 // If so, we have to make it not_entrant.
1063 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1064 if (nm != nullptr) {
1065 nm->make_not_entrant("set native function");
1066 }
1067 }
1068
1069
1070 bool Method::has_native_function() const {
1071 if (is_special_native_intrinsic())
1072 return false; // special-cased in SharedRuntime::generate_native_wrapper
1073 address func = native_function();
1074 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1075 }
1076
1077
1078 void Method::clear_native_function() {
1079 // Note: is_method_handle_intrinsic() is allowed here.
1080 set_native_function(
1081 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1082 !native_bind_event_is_interesting);
1083 this->unlink_code();
1084 }
1085
1086
1087 void Method::set_signature_handler(address handler) {
1088 address* signature_handler = signature_handler_addr();
1089 *signature_handler = handler;
1090 }
1091
1092
1093 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1094 assert(reason != nullptr, "must provide a reason");
1095 if (PrintCompilation && report) {
1096 ttyLocker ttyl;
1097 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1098 if (comp_level == CompLevel_all) {
1099 tty->print("all levels ");
1100 } else {
1101 tty->print("level %d ", comp_level);
1102 }
1103 this->print_short_name(tty);
1104 int size = this->code_size();
1105 if (size > 0) {
1106 tty->print(" (%d bytes)", size);
1107 }
1108 if (reason != nullptr) {
1109 tty->print(" %s", reason);
1110 }
1111 tty->cr();
1112 }
1113 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1114 ttyLocker ttyl;
1115 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'",
1116 os::current_thread_id(), is_osr, comp_level);
1117 if (reason != nullptr) {
1118 xtty->print(" reason=\'%s\'", reason);
1119 }
1120 xtty->method(this);
1121 xtty->stamp();
1122 xtty->end_elem();
1123 }
1124 }
1125
1126 bool Method::is_always_compilable() const {
1127 // Generated adapters must be compiled
1128 if (is_special_native_intrinsic() && is_synthetic()) {
1129 assert(!is_not_c1_compilable(), "sanity check");
1130 assert(!is_not_c2_compilable(), "sanity check");
1131 return true;
1132 }
1133
1134 return false;
1135 }
1136
1137 bool Method::is_not_compilable(int comp_level) const {
1138 if (number_of_breakpoints() > 0)
1139 return true;
1140 if (is_always_compilable())
1141 return false;
1142 if (comp_level == CompLevel_any)
1143 return is_not_c1_compilable() && is_not_c2_compilable();
1144 if (is_c1_compile(comp_level))
1145 return is_not_c1_compilable();
1146 if (is_c2_compile(comp_level))
1147 return is_not_c2_compilable();
1148 return false;
1149 }
1150
1151 // call this when compiler finds that this method is not compilable
1152 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1153 if (is_always_compilable()) {
1154 // Don't mark a method which should be always compilable
1155 return;
1156 }
1157 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1158 if (comp_level == CompLevel_all) {
1159 set_is_not_c1_compilable();
1160 set_is_not_c2_compilable();
1161 } else {
1162 if (is_c1_compile(comp_level))
1163 set_is_not_c1_compilable();
1164 if (is_c2_compile(comp_level))
1165 set_is_not_c2_compilable();
1166 }
1167 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1168 }
1169
1170 bool Method::is_not_osr_compilable(int comp_level) const {
1171 if (is_not_compilable(comp_level))
1172 return true;
1173 if (comp_level == CompLevel_any)
1174 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1175 if (is_c1_compile(comp_level))
1176 return is_not_c1_osr_compilable();
1177 if (is_c2_compile(comp_level))
1178 return is_not_c2_osr_compilable();
1179 return false;
1180 }
1181
1182 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1183 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1184 if (comp_level == CompLevel_all) {
1185 set_is_not_c1_osr_compilable();
1186 set_is_not_c2_osr_compilable();
1187 } else {
1188 if (is_c1_compile(comp_level))
1189 set_is_not_c1_osr_compilable();
1190 if (is_c2_compile(comp_level))
1191 set_is_not_c2_osr_compilable();
1192 }
1193 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1194 }
1195
1196 // Revert to using the interpreter and clear out the nmethod
1197 void Method::clear_code() {
1198 // this may be null if c2i adapters have not been made yet
1199 // Only should happen at allocate time.
1200 if (adapter() == nullptr) {
1201 _from_compiled_entry = nullptr;
1202 } else {
1203 _from_compiled_entry = adapter()->get_c2i_entry();
1204 }
1205 OrderAccess::storestore();
1206 _from_interpreted_entry = _i2i_entry;
1207 OrderAccess::storestore();
1208 _code = nullptr;
1209 }
1210
1211 void Method::unlink_code(nmethod *compare) {
1212 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1213 // We need to check if either the _code or _from_compiled_code_entry_point
1214 // refer to this nmethod because there is a race in setting these two fields
1215 // in Method* as seen in bugid 4947125.
1216 if (code() == compare ||
1217 from_compiled_entry() == compare->verified_entry_point()) {
1218 clear_code();
1219 }
1220 }
1221
1222 void Method::unlink_code() {
1223 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1224 clear_code();
1225 }
1226
1227 #if INCLUDE_CDS
1228 // Called by class data sharing to remove any entry points (which are not shared)
1229 void Method::unlink_method() {
1230 assert(CDSConfig::is_dumping_archive(), "sanity");
1231 _code = nullptr;
1232 if (!CDSConfig::is_dumping_adapters() || AdapterHandlerLibrary::is_abstract_method_adapter(_adapter)) {
1233 _adapter = nullptr;
1234 }
1235 _i2i_entry = nullptr;
1236 _from_compiled_entry = nullptr;
1237 _from_interpreted_entry = nullptr;
1238
1239 if (is_native()) {
1240 *native_function_addr() = nullptr;
1241 set_signature_handler(nullptr);
1242 }
1243 NOT_PRODUCT(set_compiled_invocation_count(0);)
1244
1245 clear_method_data();
1246 clear_method_counters();
1247 clear_is_not_c1_compilable();
1248 clear_is_not_c1_osr_compilable();
1249 clear_is_not_c2_compilable();
1250 clear_is_not_c2_osr_compilable();
1251 clear_queued_for_compilation();
1252 set_pending_queue_processed(false);
1253
1254 remove_unshareable_flags();
1255 }
1256
1257 void Method::remove_unshareable_flags() {
1258 // clear all the flags that shouldn't be in the archived version
1259 assert(!is_old(), "must be");
1260 assert(!is_obsolete(), "must be");
1261 assert(!is_deleted(), "must be");
1262
1263 set_is_prefixed_native(false);
1264 set_queued_for_compilation(false);
1265 set_pending_queue_processed(false);
1266 set_is_not_c2_compilable(false);
1267 set_is_not_c1_compilable(false);
1268 set_is_not_c2_osr_compilable(false);
1269 set_on_stack_flag(false);
1270 set_has_upcall_on_method_entry(false);
1271 set_has_upcall_on_method_exit(false);
1272 }
1273 #endif
1274
1275 // Called when the method_holder is getting linked. Setup entrypoints so the method
1276 // is ready to be called from interpreter, compiler, and vtables.
1277 void Method::link_method(const methodHandle& h_method, TRAPS) {
1278 if (log_is_enabled(Info, perf, class, link)) {
1279 ClassLoader::perf_ik_link_methods_count()->inc();
1280 }
1281
1282 // If the code cache is full, we may reenter this function for the
1283 // leftover methods that weren't linked.
1284 if (adapter() != nullptr) {
1285 if (adapter()->is_shared()) {
1286 assert(adapter()->is_linked(), "Adapter is shared but not linked");
1287 } else {
1288 return;
1289 }
1290 }
1291 assert( _code == nullptr, "nothing compiled yet" );
1292
1293 // Setup interpreter entrypoint
1294 assert(this == h_method(), "wrong h_method()" );
1295
1296 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache");
1297 address entry = Interpreter::entry_for_method(h_method);
1298 assert(entry != nullptr, "interpreter entry must be non-null");
1299 // Sets both _i2i_entry and _from_interpreted_entry
1300 set_interpreter_entry(entry);
1301
1302 // Don't overwrite already registered native entries.
1303 if (is_native() && !has_native_function()) {
1304 set_native_function(
1305 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1306 !native_bind_event_is_interesting);
1307 }
1308
1309 // Setup compiler entrypoint. This is made eagerly, so we do not need
1310 // special handling of vtables. An alternative is to make adapters more
1311 // lazily by calling make_adapter() from from_compiled_entry() for the
1312 // normal calls. For vtable calls life gets more complicated. When a
1313 // call-site goes mega-morphic we need adapters in all methods which can be
1314 // called from the vtable. We need adapters on such methods that get loaded
1315 // later. Ditto for mega-morphic itable calls. If this proves to be a
1316 // problem we'll make these lazily later.
1317 if (_adapter == nullptr) {
1318 (void) make_adapters(h_method, CHECK);
1319 assert(adapter()->is_linked(), "Adapter must have been linked");
1320 }
1321
1322 // ONLY USE the h_method now as make_adapter may have blocked
1323
1324 if (h_method->is_continuation_native_intrinsic()) {
1325 _from_interpreted_entry = nullptr;
1326 _from_compiled_entry = nullptr;
1327 _i2i_entry = nullptr;
1328 if (Continuations::enabled()) {
1329 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1330 AdapterHandlerLibrary::create_native_wrapper(h_method);
1331 if (!h_method->has_compiled_code()) {
1332 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1333 }
1334 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1335 }
1336 }
1337 if (_preload_code != nullptr) {
1338 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1339 set_code(h_method, _preload_code);
1340 assert(((nmethod*)_preload_code)->aot_code_entry() == _aot_code_entry, "sanity");
1341 }
1342 }
1343
1344 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1345 PerfTraceElapsedTime timer(ClassLoader::perf_method_adapters_time());
1346
1347 // Adapters for compiled code are made eagerly here. They are fairly
1348 // small (generally < 100 bytes) and quick to make (and cached and shared)
1349 // so making them eagerly shouldn't be too expensive.
1350 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1351 if (adapter == nullptr ) {
1352 if (!is_init_completed()) {
1353 // Don't throw exceptions during VM initialization because java.lang.* classes
1354 // might not have been initialized, causing problems when constructing the
1355 // Java exception object.
1356 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1357 } else {
1358 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1359 }
1360 }
1361
1362 mh->set_adapter_entry(adapter);
1363 mh->_from_compiled_entry = adapter->get_c2i_entry();
1364 return adapter->get_c2i_entry();
1365 }
1366
1367 // The verified_code_entry() must be called when a invoke is resolved
1368 // on this method.
1369
1370 // It returns the compiled code entry point, after asserting not null.
1371 // This function is called after potential safepoints so that nmethod
1372 // or adapter that it points to is still live and valid.
1373 // This function must not hit a safepoint!
1374 address Method::verified_code_entry() {
1375 DEBUG_ONLY(NoSafepointVerifier nsv;)
1376 assert(_from_compiled_entry != nullptr, "must be set");
1377 return _from_compiled_entry;
1378 }
1379
1380 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1381 // (could be racing a deopt).
1382 // Not inline to avoid circular ref.
1383 bool Method::check_code() const {
1384 // cached in a register or local. There's a race on the value of the field.
1385 nmethod *code = Atomic::load_acquire(&_code);
1386 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1387 }
1388
1389 // Install compiled code. Instantly it can execute.
1390 void Method::set_code(const methodHandle& mh, nmethod *code) {
1391 assert_lock_strong(NMethodState_lock);
1392 assert( code, "use clear_code to remove code" );
1393 assert( mh->check_code(), "" );
1394
1395 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1396
1397 // These writes must happen in this order, because the interpreter will
1398 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1399 // which jumps to _from_compiled_entry.
1400 mh->_code = code; // Assign before allowing compiled code to exec
1401
1402 int comp_level = code->comp_level();
1403 // In theory there could be a race here. In practice it is unlikely
1404 // and not worth worrying about.
1405 if (comp_level > mh->highest_comp_level()) {
1406 mh->set_highest_comp_level(comp_level);
1407 }
1408
1409 OrderAccess::storestore();
1410 mh->_from_compiled_entry = code->verified_entry_point();
1411 OrderAccess::storestore();
1412
1413 if (mh->is_continuation_native_intrinsic()) {
1414 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1415
1416 if (mh->is_continuation_enter_intrinsic()) {
1417 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1418 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1419 } else if (mh->is_continuation_yield_intrinsic()) {
1420 mh->_i2i_entry = mh->get_i2c_entry();
1421 } else {
1422 guarantee(false, "Unknown Continuation native intrinsic");
1423 }
1424 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1425 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1426 } else if (!mh->is_method_handle_intrinsic()) {
1427 // Instantly compiled code can execute.
1428 mh->_from_interpreted_entry = mh->get_i2c_entry();
1429 }
1430 }
1431
1432
1433 bool Method::is_overridden_in(Klass* k) const {
1434 InstanceKlass* ik = InstanceKlass::cast(k);
1435
1436 if (ik->is_interface()) return false;
1437
1438 // If method is an interface, we skip it - except if it
1439 // is a miranda method
1440 if (method_holder()->is_interface()) {
1441 // Check that method is not a miranda method
1442 if (ik->lookup_method(name(), signature()) == nullptr) {
1443 // No implementation exist - so miranda method
1444 return false;
1445 }
1446 return true;
1447 }
1448
1449 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1450 if (!has_vtable_index()) {
1451 return false;
1452 } else {
1453 Method* vt_m = ik->method_at_vtable(vtable_index());
1454 return vt_m != this;
1455 }
1456 }
1457
1458
1459 // give advice about whether this Method* should be cached or not
1460 bool Method::should_not_be_cached() const {
1461 if (is_old()) {
1462 // This method has been redefined. It is either EMCP or obsolete
1463 // and we don't want to cache it because that would pin the method
1464 // down and prevent it from being collectible if and when it
1465 // finishes executing.
1466 return true;
1467 }
1468
1469 // caching this method should be just fine
1470 return false;
1471 }
1472
1473
1474 /**
1475 * Returns true if this is one of the specially treated methods for
1476 * security related stack walks (like Reflection.getCallerClass).
1477 */
1478 bool Method::is_ignored_by_security_stack_walk() const {
1479 if (intrinsic_id() == vmIntrinsics::_invoke) {
1480 // This is Method.invoke() -- ignore it
1481 return true;
1482 }
1483 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1484 // This is an auxiliary frame -- ignore it
1485 return true;
1486 }
1487 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1488 // This is an internal adapter frame for method handles -- ignore it
1489 return true;
1490 }
1491 return false;
1492 }
1493
1494
1495 // Constant pool structure for invoke methods:
1496 enum {
1497 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1498 _imcp_invoke_signature, // utf8: (variable Symbol*)
1499 _imcp_limit
1500 };
1501
1502 // Test if this method is an MH adapter frame generated by Java code.
1503 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1504 bool Method::is_compiled_lambda_form() const {
1505 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1506 }
1507
1508 // Test if this method is an internal MH primitive method.
1509 bool Method::is_method_handle_intrinsic() const {
1510 vmIntrinsics::ID iid = intrinsic_id();
1511 return (MethodHandles::is_signature_polymorphic(iid) &&
1512 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1513 }
1514
1515 bool Method::has_member_arg() const {
1516 vmIntrinsics::ID iid = intrinsic_id();
1517 return (MethodHandles::is_signature_polymorphic(iid) &&
1518 MethodHandles::has_member_arg(iid));
1519 }
1520
1521 // Make an instance of a signature-polymorphic internal MH primitive.
1522 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1523 Symbol* signature,
1524 TRAPS) {
1525 ResourceMark rm(THREAD);
1526 methodHandle empty;
1527
1528 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1529 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1530 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1531
1532 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1533
1534 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1535 name->increment_refcount();
1536 signature->increment_refcount();
1537
1538 int cp_length = _imcp_limit;
1539 ClassLoaderData* loader_data = holder->class_loader_data();
1540 constantPoolHandle cp;
1541 {
1542 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1543 cp = constantPoolHandle(THREAD, cp_oop);
1544 }
1545 cp->copy_fields(holder->constants());
1546 cp->set_pool_holder(holder);
1547 cp->symbol_at_put(_imcp_invoke_name, name);
1548 cp->symbol_at_put(_imcp_invoke_signature, signature);
1549 cp->set_has_preresolution();
1550 cp->set_is_for_method_handle_intrinsic();
1551
1552 // decide on access bits: public or not?
1553 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1554 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1555 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1556 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1557
1558 methodHandle m;
1559 {
1560 InlineTableSizes sizes;
1561 Method* m_oop = Method::allocate(loader_data, 0,
1562 accessFlags_from(flags_bits), &sizes,
1563 ConstMethod::NORMAL,
1564 name,
1565 CHECK_(empty));
1566 m = methodHandle(THREAD, m_oop);
1567 }
1568 m->set_constants(cp());
1569 m->set_name_index(_imcp_invoke_name);
1570 m->set_signature_index(_imcp_invoke_signature);
1571 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1572 assert(m->signature() == signature, "");
1573 m->constMethod()->compute_from_signature(signature, must_be_static);
1574 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1575 assert(m->is_method_handle_intrinsic(), "");
1576 #ifdef ASSERT
1577 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1578 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1579 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1580 #endif //ASSERT
1581
1582 // Finally, set up its entry points.
1583 assert(m->can_be_statically_bound(), "");
1584 m->set_vtable_index(Method::nonvirtual_vtable_index);
1585 m->link_method(m, CHECK_(empty));
1586
1587 if (iid == vmIntrinsics::_linkToNative) {
1588 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1589 }
1590 if (log_is_enabled(Debug, methodhandles)) {
1591 LogTarget(Debug, methodhandles) lt;
1592 LogStream ls(lt);
1593 m->print_on(&ls);
1594 }
1595
1596 return m;
1597 }
1598
1599 #if INCLUDE_CDS
1600 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1601 if (m->adapter() != nullptr) {
1602 m->set_from_compiled_entry(m->adapter()->get_c2i_entry());
1603 }
1604 m->link_method(m, CHECK);
1605
1606 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1607 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1608 }
1609 }
1610 #endif
1611
1612 Klass* Method::check_non_bcp_klass(Klass* klass) {
1613 if (klass != nullptr && klass->class_loader() != nullptr) {
1614 if (klass->is_objArray_klass())
1615 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1616 return klass;
1617 }
1618 return nullptr;
1619 }
1620
1621
1622 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1623 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1624 // Code below does not work for native methods - they should never get rewritten anyway
1625 assert(!m->is_native(), "cannot rewrite native methods");
1626 // Allocate new Method*
1627 AccessFlags flags = m->access_flags();
1628
1629 ConstMethod* cm = m->constMethod();
1630 int checked_exceptions_len = cm->checked_exceptions_length();
1631 int localvariable_len = cm->localvariable_table_length();
1632 int exception_table_len = cm->exception_table_length();
1633 int method_parameters_len = cm->method_parameters_length();
1634 int method_annotations_len = cm->method_annotations_length();
1635 int parameter_annotations_len = cm->parameter_annotations_length();
1636 int type_annotations_len = cm->type_annotations_length();
1637 int default_annotations_len = cm->default_annotations_length();
1638
1639 InlineTableSizes sizes(
1640 localvariable_len,
1641 new_compressed_linenumber_size,
1642 exception_table_len,
1643 checked_exceptions_len,
1644 method_parameters_len,
1645 cm->generic_signature_index(),
1646 method_annotations_len,
1647 parameter_annotations_len,
1648 type_annotations_len,
1649 default_annotations_len,
1650 0);
1651
1652 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1653 Method* newm_oop = Method::allocate(loader_data,
1654 new_code_length,
1655 flags,
1656 &sizes,
1657 m->method_type(),
1658 m->name(),
1659 CHECK_(methodHandle()));
1660 methodHandle newm (THREAD, newm_oop);
1661
1662 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1663 ConstMethod* newcm = newm->constMethod();
1664 int new_const_method_size = newm->constMethod()->size();
1665
1666 // This works because the source and target are both Methods. Some compilers
1667 // (e.g., clang) complain that the target vtable pointer will be stomped,
1668 // so cast away newm()'s and m()'s Methodness.
1669 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1670
1671 // Create shallow copy of ConstMethod.
1672 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1673
1674 // Reset correct method/const method, method size, and parameter info
1675 newm->set_constMethod(newcm);
1676 newm->constMethod()->set_code_size(new_code_length);
1677 newm->constMethod()->set_constMethod_size(new_const_method_size);
1678 assert(newm->code_size() == new_code_length, "check");
1679 assert(newm->method_parameters_length() == method_parameters_len, "check");
1680 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1681 assert(newm->exception_table_length() == exception_table_len, "check");
1682 assert(newm->localvariable_table_length() == localvariable_len, "check");
1683 // Copy new byte codes
1684 memcpy(newm->code_base(), new_code, new_code_length);
1685 // Copy line number table
1686 if (new_compressed_linenumber_size > 0) {
1687 memcpy(newm->compressed_linenumber_table(),
1688 new_compressed_linenumber_table,
1689 new_compressed_linenumber_size);
1690 }
1691 // Copy method_parameters
1692 if (method_parameters_len > 0) {
1693 memcpy(newm->method_parameters_start(),
1694 m->method_parameters_start(),
1695 method_parameters_len * sizeof(MethodParametersElement));
1696 }
1697 // Copy checked_exceptions
1698 if (checked_exceptions_len > 0) {
1699 memcpy(newm->checked_exceptions_start(),
1700 m->checked_exceptions_start(),
1701 checked_exceptions_len * sizeof(CheckedExceptionElement));
1702 }
1703 // Copy exception table
1704 if (exception_table_len > 0) {
1705 memcpy(newm->exception_table_start(),
1706 m->exception_table_start(),
1707 exception_table_len * sizeof(ExceptionTableElement));
1708 }
1709 // Copy local variable number table
1710 if (localvariable_len > 0) {
1711 memcpy(newm->localvariable_table_start(),
1712 m->localvariable_table_start(),
1713 localvariable_len * sizeof(LocalVariableTableElement));
1714 }
1715 // Copy stackmap table
1716 if (m->has_stackmap_table()) {
1717 int code_attribute_length = m->stackmap_data()->length();
1718 Array<u1>* stackmap_data =
1719 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1720 memcpy((void*)stackmap_data->adr_at(0),
1721 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1722 newm->set_stackmap_data(stackmap_data);
1723 }
1724
1725 // copy annotations over to new method
1726 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1727 return newm;
1728 }
1729
1730 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1731 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1732 // because we are not loading from core libraries
1733 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1734 // which does not use the class default class loader so we check for its loader here
1735 const InstanceKlass* ik = InstanceKlass::cast(holder);
1736 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1737 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1738 }
1739
1740 // see if the klass name is well-known:
1741 Symbol* klass_name = ik->name();
1742 vmSymbolID id = vmSymbols::find_sid(klass_name);
1743 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1744 return id;
1745 } else {
1746 return vmSymbolID::NO_SID;
1747 }
1748 }
1749
1750 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1751 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1752 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1753 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1754 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1755
1756 // the klass name is well-known:
1757 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1758 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1759
1760 // ditto for method and signature:
1761 vmSymbolID name_id = vmSymbols::find_sid(name());
1762 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1763 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1764 && name_id == vmSymbolID::NO_SID) {
1765 return;
1766 }
1767 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1768 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1769 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1770 && sig_id == vmSymbolID::NO_SID) {
1771 return;
1772 }
1773
1774 u2 flags = access_flags().as_method_flags();
1775 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1776 if (id != vmIntrinsics::_none) {
1777 set_intrinsic_id(id);
1778 if (id == vmIntrinsics::_Class_cast) {
1779 // Even if the intrinsic is rejected, we want to inline this simple method.
1780 set_force_inline();
1781 }
1782 return;
1783 }
1784
1785 // A few slightly irregular cases:
1786 switch (klass_id) {
1787 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1788 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1789 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1790 if (!is_native()) break;
1791 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1792 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1793 id = vmIntrinsics::_none;
1794 break;
1795
1796 default:
1797 break;
1798 }
1799
1800 if (id != vmIntrinsics::_none) {
1801 // Set up its iid. It is an alias method.
1802 set_intrinsic_id(id);
1803 return;
1804 }
1805 }
1806
1807 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1808 if (!THREAD->can_call_java()) {
1809 // There is nothing useful this routine can do from within the Compile thread.
1810 // Hopefully, the signature contains only well-known classes.
1811 // We could scan for this and return true/false, but the caller won't care.
1812 return false;
1813 }
1814 bool sig_is_loaded = true;
1815 ResourceMark rm(THREAD);
1816 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1817 if (ss.is_reference()) {
1818 // load everything, including arrays "[Lfoo;"
1819 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1820 // We are loading classes eagerly. If a ClassNotFoundException or
1821 // a LinkageError was generated, be sure to ignore it.
1822 if (HAS_PENDING_EXCEPTION) {
1823 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1824 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1825 CLEAR_PENDING_EXCEPTION;
1826 } else {
1827 return false;
1828 }
1829 }
1830 if( klass == nullptr) { sig_is_loaded = false; }
1831 }
1832 }
1833 return sig_is_loaded;
1834 }
1835
1836 // Exposed so field engineers can debug VM
1837 void Method::print_short_name(outputStream* st) const {
1838 ResourceMark rm;
1839 #ifdef PRODUCT
1840 st->print(" %s::", method_holder()->external_name());
1841 #else
1842 st->print(" %s::", method_holder()->internal_name());
1843 #endif
1844 name()->print_symbol_on(st);
1845 if (WizardMode) signature()->print_symbol_on(st);
1846 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1847 MethodHandles::print_as_basic_type_signature_on(st, signature());
1848 }
1849
1850 // Comparer for sorting an object array containing
1851 // Method*s.
1852 static int method_comparator(Method* a, Method* b) {
1853 return a->name()->fast_compare(b->name());
1854 }
1855
1856 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1857 // default_methods also uses this without the ordering for fast find_method
1858 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1859 int length = methods->length();
1860 if (length > 1) {
1861 if (func == nullptr) {
1862 func = method_comparator;
1863 }
1864 {
1865 NoSafepointVerifier nsv;
1866 QuickSort::sort(methods->data(), length, func);
1867 }
1868 // Reset method ordering
1869 if (set_idnums) {
1870 for (u2 i = 0; i < length; i++) {
1871 Method* m = methods->at(i);
1872 m->set_method_idnum(i);
1873 m->set_orig_method_idnum(i);
1874 }
1875 }
1876 }
1877 }
1878
1879 //-----------------------------------------------------------------------------------
1880 // Non-product code unless JVM/TI needs it
1881
1882 #if !defined(PRODUCT) || INCLUDE_JVMTI
1883 class SignatureTypePrinter : public SignatureTypeNames {
1884 private:
1885 outputStream* _st;
1886 bool _use_separator;
1887
1888 void type_name(const char* name) {
1889 if (_use_separator) _st->print(", ");
1890 _st->print("%s", name);
1891 _use_separator = true;
1892 }
1893
1894 public:
1895 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1896 _st = st;
1897 _use_separator = false;
1898 }
1899
1900 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1901 void print_returntype() { _use_separator = false; do_type(return_type()); }
1902 };
1903
1904
1905 void Method::print_name(outputStream* st) const {
1906 Thread *thread = Thread::current();
1907 ResourceMark rm(thread);
1908 st->print("%s ", is_static() ? "static" : "virtual");
1909 if (WizardMode) {
1910 st->print("%s.", method_holder()->internal_name());
1911 name()->print_symbol_on(st);
1912 signature()->print_symbol_on(st);
1913 } else {
1914 SignatureTypePrinter sig(signature(), st);
1915 sig.print_returntype();
1916 st->print(" %s.", method_holder()->internal_name());
1917 name()->print_symbol_on(st);
1918 st->print("(");
1919 sig.print_parameters();
1920 st->print(")");
1921 }
1922 }
1923 #endif // !PRODUCT || INCLUDE_JVMTI
1924
1925
1926 void Method::print_codes_on(outputStream* st, int flags) const {
1927 print_codes_on(0, code_size(), st, flags);
1928 }
1929
1930 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1931 Thread *thread = Thread::current();
1932 ResourceMark rm(thread);
1933 methodHandle mh (thread, (Method*)this);
1934 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1935 }
1936
1937 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1938 _bci = 0;
1939 _line = 0;
1940 };
1941
1942 bool CompressedLineNumberReadStream::read_pair() {
1943 jubyte next = read_byte();
1944 // Check for terminator
1945 if (next == 0) return false;
1946 if (next == 0xFF) {
1947 // Escape character, regular compression used
1948 _bci += read_signed_int();
1949 _line += read_signed_int();
1950 } else {
1951 // Single byte compression used
1952 _bci += next >> 3;
1953 _line += next & 0x7;
1954 }
1955 return true;
1956 }
1957
1958 #if INCLUDE_JVMTI
1959
1960 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1961 BreakpointInfo* bp = method_holder()->breakpoints();
1962 for (; bp != nullptr; bp = bp->next()) {
1963 if (bp->match(this, bci)) {
1964 return bp->orig_bytecode();
1965 }
1966 }
1967 {
1968 ResourceMark rm;
1969 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1970 }
1971 return Bytecodes::_shouldnotreachhere;
1972 }
1973
1974 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1975 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1976 BreakpointInfo* bp = method_holder()->breakpoints();
1977 for (; bp != nullptr; bp = bp->next()) {
1978 if (bp->match(this, bci)) {
1979 bp->set_orig_bytecode(code);
1980 // and continue, in case there is more than one
1981 }
1982 }
1983 }
1984
1985 void Method::set_breakpoint(int bci) {
1986 InstanceKlass* ik = method_holder();
1987 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1988 bp->set_next(ik->breakpoints());
1989 ik->set_breakpoints(bp);
1990 // do this last:
1991 bp->set(this);
1992 }
1993
1994 static void clear_matches(Method* m, int bci) {
1995 InstanceKlass* ik = m->method_holder();
1996 BreakpointInfo* prev_bp = nullptr;
1997 BreakpointInfo* next_bp;
1998 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1999 next_bp = bp->next();
2000 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
2001 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
2002 // do this first:
2003 bp->clear(m);
2004 // unhook it
2005 if (prev_bp != nullptr)
2006 prev_bp->set_next(next_bp);
2007 else
2008 ik->set_breakpoints(next_bp);
2009 delete bp;
2010 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
2011 // at same location. So we have multiple matching (method_index and bci)
2012 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
2013 // breakpoint for clear_breakpoint request and keep all other method versions
2014 // BreakpointInfo for future clear_breakpoint request.
2015 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
2016 // which is being called when class is unloaded. We delete all the Breakpoint
2017 // information for all versions of method. We may not correctly restore the original
2018 // bytecode in all method versions, but that is ok. Because the class is being unloaded
2019 // so these methods won't be used anymore.
2020 if (bci >= 0) {
2021 break;
2022 }
2023 } else {
2024 // This one is a keeper.
2025 prev_bp = bp;
2026 }
2027 }
2028 }
2029
2030 void Method::clear_breakpoint(int bci) {
2031 assert(bci >= 0, "");
2032 clear_matches(this, bci);
2033 }
2034
2035 void Method::clear_all_breakpoints() {
2036 clear_matches(this, -1);
2037 }
2038
2039 #endif // INCLUDE_JVMTI
2040
2041 int Method::highest_osr_comp_level() const {
2042 const MethodCounters* mcs = method_counters();
2043 if (mcs != nullptr) {
2044 return mcs->highest_osr_comp_level();
2045 } else {
2046 return CompLevel_none;
2047 }
2048 }
2049
2050 void Method::set_highest_comp_level(int level) {
2051 MethodCounters* mcs = method_counters();
2052 if (mcs != nullptr) {
2053 mcs->set_highest_comp_level(level);
2054 }
2055 }
2056
2057 void Method::set_highest_osr_comp_level(int level) {
2058 MethodCounters* mcs = method_counters();
2059 if (mcs != nullptr) {
2060 mcs->set_highest_osr_comp_level(level);
2061 }
2062 }
2063
2064 #if INCLUDE_JVMTI
2065
2066 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2067 _bci = bci;
2068 _name_index = m->name_index();
2069 _signature_index = m->signature_index();
2070 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2071 if (_orig_bytecode == Bytecodes::_breakpoint)
2072 _orig_bytecode = m->orig_bytecode_at(_bci);
2073 _next = nullptr;
2074 }
2075
2076 void BreakpointInfo::set(Method* method) {
2077 #ifdef ASSERT
2078 {
2079 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2080 if (code == Bytecodes::_breakpoint)
2081 code = method->orig_bytecode_at(_bci);
2082 assert(orig_bytecode() == code, "original bytecode must be the same");
2083 }
2084 #endif
2085 Thread *thread = Thread::current();
2086 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2087 method->incr_number_of_breakpoints(thread);
2088 {
2089 // Deoptimize all dependents on this method
2090 HandleMark hm(thread);
2091 methodHandle mh(thread, method);
2092 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2093 }
2094 }
2095
2096 void BreakpointInfo::clear(Method* method) {
2097 *method->bcp_from(_bci) = orig_bytecode();
2098 assert(method->number_of_breakpoints() > 0, "must not go negative");
2099 method->decr_number_of_breakpoints(Thread::current());
2100 }
2101
2102 #endif // INCLUDE_JVMTI
2103
2104 // jmethodID handling
2105
2106 // This is a block allocating object, sort of like JNIHandleBlock, only a
2107 // lot simpler.
2108 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2109 // never get rid of it.
2110
2111 static const int min_block_size = 8;
2112
2113 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2114 friend class JNIMethodBlock;
2115 Method** _methods;
2116 int _number_of_methods;
2117 int _top;
2118 JNIMethodBlockNode* _next;
2119
2120 public:
2121
2122 JNIMethodBlockNode(int num_methods = min_block_size);
2123
2124 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2125
2126 void ensure_methods(int num_addl_methods) {
2127 if (_top < _number_of_methods) {
2128 num_addl_methods -= _number_of_methods - _top;
2129 if (num_addl_methods <= 0) {
2130 return;
2131 }
2132 }
2133 if (_next == nullptr) {
2134 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2135 } else {
2136 _next->ensure_methods(num_addl_methods);
2137 }
2138 }
2139 };
2140
2141 class JNIMethodBlock : public CHeapObj<mtClass> {
2142 JNIMethodBlockNode _head;
2143 JNIMethodBlockNode *_last_free;
2144 public:
2145 static Method* const _free_method;
2146
2147 JNIMethodBlock(int initial_capacity = min_block_size)
2148 : _head(initial_capacity), _last_free(&_head) {}
2149
2150 void ensure_methods(int num_addl_methods) {
2151 _last_free->ensure_methods(num_addl_methods);
2152 }
2153
2154 Method** add_method(Method* m) {
2155 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2156 if (b->_top < b->_number_of_methods) {
2157 // top points to the next free entry.
2158 int i = b->_top;
2159 b->_methods[i] = m;
2160 b->_top++;
2161 _last_free = b;
2162 return &(b->_methods[i]);
2163 } else if (b->_top == b->_number_of_methods) {
2164 // if the next free entry ran off the block see if there's a free entry
2165 for (int i = 0; i < b->_number_of_methods; i++) {
2166 if (b->_methods[i] == _free_method) {
2167 b->_methods[i] = m;
2168 _last_free = b;
2169 return &(b->_methods[i]);
2170 }
2171 }
2172 // Only check each block once for frees. They're very unlikely.
2173 // Increment top past the end of the block.
2174 b->_top++;
2175 }
2176 // need to allocate a next block.
2177 if (b->_next == nullptr) {
2178 b->_next = _last_free = new JNIMethodBlockNode();
2179 }
2180 }
2181 guarantee(false, "Should always allocate a free block");
2182 return nullptr;
2183 }
2184
2185 bool contains(Method** m) {
2186 if (m == nullptr) return false;
2187 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2188 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2189 // This is a bit of extra checking, for two reasons. One is
2190 // that contains() deals with pointers that are passed in by
2191 // JNI code, so making sure that the pointer is aligned
2192 // correctly is valuable. The other is that <= and > are
2193 // technically not defined on pointers, so the if guard can
2194 // pass spuriously; no modern compiler is likely to make that
2195 // a problem, though (and if one did, the guard could also
2196 // fail spuriously, which would be bad).
2197 ptrdiff_t idx = m - b->_methods;
2198 if (b->_methods + idx == m) {
2199 return true;
2200 }
2201 }
2202 }
2203 return false; // not found
2204 }
2205
2206 // During class unloading the methods are cleared, which is different
2207 // than freed.
2208 void clear_all_methods() {
2209 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2210 for (int i = 0; i< b->_number_of_methods; i++) {
2211 b->_methods[i] = nullptr;
2212 }
2213 }
2214 }
2215 #ifndef PRODUCT
2216 int count_methods() {
2217 // count all allocated methods
2218 int count = 0;
2219 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2220 for (int i = 0; i< b->_number_of_methods; i++) {
2221 if (b->_methods[i] != _free_method) count++;
2222 }
2223 }
2224 return count;
2225 }
2226 #endif // PRODUCT
2227 };
2228
2229 // Something that can't be mistaken for an address or a markWord
2230 Method* const JNIMethodBlock::_free_method = (Method*)55;
2231
2232 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2233 _number_of_methods = MAX2(num_methods, min_block_size);
2234 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2235 for (int i = 0; i < _number_of_methods; i++) {
2236 _methods[i] = JNIMethodBlock::_free_method;
2237 }
2238 }
2239
2240 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2241 // Have to add jmethod_ids() to class loader data thread-safely.
2242 // Also have to add the method to the list safely, which the lock
2243 // protects as well.
2244 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2245 if (cld->jmethod_ids() == nullptr) {
2246 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2247 } else {
2248 cld->jmethod_ids()->ensure_methods(capacity);
2249 }
2250 }
2251
2252 // Add a method id to the jmethod_ids
2253 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2254 // Have to add jmethod_ids() to class loader data thread-safely.
2255 // Also have to add the method to the list safely, which the lock
2256 // protects as well.
2257 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2258
2259 ResourceMark rm;
2260 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name());
2261 if (cld->jmethod_ids() == nullptr) {
2262 cld->set_jmethod_ids(new JNIMethodBlock());
2263 }
2264 // jmethodID is a pointer to Method*
2265 return (jmethodID)cld->jmethod_ids()->add_method(m);
2266 }
2267
2268 jmethodID Method::jmethod_id() {
2269 methodHandle mh(Thread::current(), this);
2270 return method_holder()->get_jmethod_id(mh);
2271 }
2272
2273 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2274 // Can't assert the method_holder is the same because the new method has the
2275 // scratch method holder.
2276 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2277 == new_method->method_holder()->class_loader() ||
2278 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2279 "changing to a different class loader");
2280 // Just change the method in place, jmethodID pointer doesn't change.
2281 *((Method**)jmid) = new_method;
2282 }
2283
2284 bool Method::is_method_id(jmethodID mid) {
2285 Method* m = resolve_jmethod_id(mid);
2286 assert(m != nullptr, "should be called with non-null method");
2287 InstanceKlass* ik = m->method_holder();
2288 ClassLoaderData* cld = ik->class_loader_data();
2289 if (cld->jmethod_ids() == nullptr) return false;
2290 return (cld->jmethod_ids()->contains((Method**)mid));
2291 }
2292
2293 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2294 if (mid == nullptr) return nullptr;
2295 Method* o = resolve_jmethod_id(mid);
2296 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2297 return nullptr;
2298 }
2299 // Method should otherwise be valid. Assert for testing.
2300 assert(is_valid_method(o), "should be valid jmethodid");
2301 // If the method's class holder object is unreferenced, but not yet marked as
2302 // unloaded, we need to return null here too because after a safepoint, its memory
2303 // will be reclaimed.
2304 return o->method_holder()->is_loader_alive() ? o : nullptr;
2305 };
2306
2307 void Method::set_on_stack(const bool value) {
2308 // Set both the method itself and its constant pool. The constant pool
2309 // on stack means some method referring to it is also on the stack.
2310 constants()->set_on_stack(value);
2311
2312 bool already_set = on_stack_flag();
2313 set_on_stack_flag(value);
2314 if (value && !already_set) {
2315 MetadataOnStackMark::record(this);
2316 }
2317 }
2318
2319 void Method::record_gc_epoch() {
2320 // If any method is on the stack in continuations, none of them can be reclaimed,
2321 // so save the marking cycle to check for the whole class in the cpCache.
2322 // The cpCache is writeable.
2323 constants()->cache()->record_gc_epoch();
2324 }
2325
2326 // Called when the class loader is unloaded to make all methods weak.
2327 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2328 loader_data->jmethod_ids()->clear_all_methods();
2329 }
2330
2331 void Method::clear_jmethod_id() {
2332 // Being at a safepoint prevents racing against other class redefinitions
2333 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2334 // The jmethodID is not stored in the Method instance, we need to look it up first
2335 jmethodID methodid = find_jmethod_id_or_null();
2336 // We need to make sure that jmethodID actually resolves to this method
2337 // - multiple redefined versions may share jmethodID slots and if a method
2338 // has already been rewired to a newer version we could be removing reference
2339 // to a still existing method instance
2340 if (methodid != nullptr && *((Method**)methodid) == this) {
2341 *((Method**)methodid) = nullptr;
2342 }
2343 }
2344
2345 bool Method::has_method_vptr(const void* ptr) {
2346 Method m;
2347 // This assumes that the vtbl pointer is the first word of a C++ object.
2348 return dereference_vptr(&m) == dereference_vptr(ptr);
2349 }
2350
2351 // Check that this pointer is valid by checking that the vtbl pointer matches
2352 bool Method::is_valid_method(const Method* m) {
2353 if (m == nullptr) {
2354 return false;
2355 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2356 // Quick sanity check on pointer.
2357 return false;
2358 } else if (!os::is_readable_range(m, m + 1)) {
2359 return false;
2360 } else if (m->is_shared()) {
2361 return CppVtables::is_valid_shared_method(m);
2362 } else if (Metaspace::contains_non_shared(m)) {
2363 return has_method_vptr((const void*)m);
2364 } else {
2365 return false;
2366 }
2367 }
2368
2369 #ifndef PRODUCT
2370 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2371 out->print("%d", loader_data->jmethod_ids()->count_methods());
2372 }
2373 #endif // PRODUCT
2374
2375
2376 // Printing
2377
2378 #ifndef PRODUCT
2379
2380 void Method::print_on(outputStream* st) const {
2381 ResourceMark rm;
2382 assert(is_method(), "must be method");
2383 st->print_cr("%s", internal_name());
2384 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2385 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2386 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2387 constants()->print_value_on(st); st->cr();
2388 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr();
2389 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2390 st->print (" - name: "); name()->print_value_on(st); st->cr();
2391 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2392 st->print_cr(" - max stack: %d", max_stack());
2393 st->print_cr(" - max locals: %d", max_locals());
2394 st->print_cr(" - size of params: %d", size_of_parameters());
2395 st->print_cr(" - method size: %d", method_size());
2396 if (intrinsic_id() != vmIntrinsics::_none)
2397 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2398 if (highest_comp_level() != CompLevel_none)
2399 st->print_cr(" - highest level: %d", highest_comp_level());
2400 st->print_cr(" - vtable index: %d", _vtable_index);
2401 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2402 st->print( " - adapters: ");
2403 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2404 if (a == nullptr)
2405 st->print_cr(PTR_FORMAT, p2i(a));
2406 else
2407 a->print_adapter_on(st);
2408 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2409 st->print_cr(" - code size: %d", code_size());
2410 if (code_size() != 0) {
2411 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2412 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2413 }
2414 if (method_data() != nullptr) {
2415 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2416 }
2417 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2418 if (checked_exceptions_length() > 0) {
2419 CheckedExceptionElement* table = checked_exceptions_start();
2420 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2421 if (Verbose) {
2422 for (int i = 0; i < checked_exceptions_length(); i++) {
2423 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2424 }
2425 }
2426 }
2427 if (has_linenumber_table()) {
2428 u_char* table = compressed_linenumber_table();
2429 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2430 if (Verbose) {
2431 CompressedLineNumberReadStream stream(table);
2432 while (stream.read_pair()) {
2433 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2434 }
2435 }
2436 }
2437 st->print_cr(" - localvar length: %d", localvariable_table_length());
2438 if (localvariable_table_length() > 0) {
2439 LocalVariableTableElement* table = localvariable_table_start();
2440 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2441 if (Verbose) {
2442 for (int i = 0; i < localvariable_table_length(); i++) {
2443 int bci = table[i].start_bci;
2444 int len = table[i].length;
2445 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2446 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2447 int slot = table[i].slot;
2448 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2449 }
2450 }
2451 }
2452 if (code() != nullptr) {
2453 st->print (" - compiled code: ");
2454 code()->print_value_on(st);
2455 }
2456 if (is_native()) {
2457 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2458 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2459 }
2460 }
2461
2462 void Method::print_linkage_flags(outputStream* st) {
2463 access_flags().print_on(st);
2464 if (is_default_method()) {
2465 st->print("default ");
2466 }
2467 if (is_overpass()) {
2468 st->print("overpass ");
2469 }
2470 }
2471 #endif //PRODUCT
2472
2473 void Method::print_value_on(outputStream* st) const {
2474 assert(is_method(), "must be method");
2475 st->print("%s", internal_name());
2476 print_address_on(st);
2477 st->print(" ");
2478 name()->print_value_on(st);
2479 st->print(" ");
2480 signature()->print_value_on(st);
2481 st->print(" in ");
2482 method_holder()->print_value_on(st);
2483 if (WizardMode) st->print("#%d", _vtable_index);
2484 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2485 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2486 }
2487
2488 // Verification
2489
2490 void Method::verify_on(outputStream* st) {
2491 guarantee(is_method(), "object must be method");
2492 guarantee(constants()->is_constantPool(), "should be constant pool");
2493 MethodData* md = method_data();
2494 guarantee(md == nullptr ||
2495 md->is_methodData(), "should be method data");
2496 }