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 set_preload_code(nullptr);
120 set_aot_code_entry(nullptr);
121
122 if (access_flags.is_native()) {
123 clear_native_function();
124 set_signature_handler(nullptr);
125 }
126
127 NOT_PRODUCT(set_compiled_invocation_count(0);)
128 // Name is very useful for debugging.
129 NOT_PRODUCT(_name = name;)
130 }
131
132 // Release Method*. The nmethod will be gone when we get here because
133 // we've walked the code cache.
134 void Method::deallocate_contents(ClassLoaderData* loader_data) {
135 MetadataFactory::free_metadata(loader_data, constMethod());
136 set_constMethod(nullptr);
137 MetadataFactory::free_metadata(loader_data, method_data());
138 clear_method_data();
139 MetadataFactory::free_metadata(loader_data, method_counters());
140 clear_method_counters();
141 set_adapter_entry(nullptr);
142 // The nmethod will be gone when we get here.
143 if (code() != nullptr) _code = nullptr;
144 if (aot_code_entry() != nullptr) {
145 set_preload_code(nullptr);
146 AOTCodeCache::invalidate(aot_code_entry());
147 set_aot_code_entry(nullptr);
148 }
149 }
150
151 void Method::release_C_heap_structures() {
152 if (method_data()) {
153 method_data()->release_C_heap_structures();
154
155 // Destroy MethodData embedded lock
156 method_data()->~MethodData();
157 }
158 }
159
160 address Method::get_i2c_entry() {
161 assert(adapter() != nullptr, "must have");
162 return adapter()->get_i2c_entry();
163 }
164
165 address Method::get_c2i_entry() {
166 assert(adapter() != nullptr, "must have");
167 return adapter()->get_c2i_entry();
168 }
169
170 address Method::get_c2i_unverified_entry() {
171 assert(adapter() != nullptr, "must have");
172 return adapter()->get_c2i_unverified_entry();
173 }
174
175 address Method::get_c2i_no_clinit_check_entry() {
176 assert(VM_Version::supports_fast_class_init_checks(), "");
177 assert(adapter() != nullptr, "must have");
178 return adapter()->get_c2i_no_clinit_check_entry();
179 }
180
181 char* Method::name_and_sig_as_C_string() const {
182 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
183 }
184
185 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
186 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
187 }
188
189 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
190 const char* klass_name = klass->external_name();
191 int klass_name_len = (int)strlen(klass_name);
192 int method_name_len = method_name->utf8_length();
193 int len = klass_name_len + 2 + method_name_len + signature->utf8_length();
194 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
195 strcpy(dest, klass_name);
196 dest[klass_name_len + 0] = ':';
197 dest[klass_name_len + 1] = ':';
198 strcpy(&dest[klass_name_len + 2], method_name->as_C_string());
199 strcpy(&dest[klass_name_len + 2 + method_name_len], signature->as_C_string());
200 dest[len] = 0;
201 return dest;
202 }
203
204 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
205 Symbol* klass_name = klass->name();
206 klass_name->as_klass_external_name(buf, size);
207 int len = (int)strlen(buf);
208
209 if (len < size - 1) {
210 buf[len++] = '.';
211
212 method_name->as_C_string(&(buf[len]), size - len);
213 len = (int)strlen(buf);
214
215 signature->as_C_string(&(buf[len]), size - len);
216 }
217
218 return buf;
219 }
220
221 const char* Method::external_name() const {
222 return external_name(constants()->pool_holder(), name(), signature());
223 }
224
225 void Method::print_external_name(outputStream *os) const {
226 print_external_name(os, constants()->pool_holder(), name(), signature());
227 }
228
229 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
230 stringStream ss;
231 print_external_name(&ss, klass, method_name, signature);
232 return ss.as_string();
233 }
234
235 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
236 signature->print_as_signature_external_return_type(os);
237 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
238 signature->print_as_signature_external_parameters(os);
239 os->print(")");
240 }
241
242 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
243 if (log_is_enabled(Debug, exceptions)) {
244 ResourceMark rm(THREAD);
245 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
246 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
247 }
248 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
249 // access exception table
250 ExceptionTable table(mh());
251 int length = table.length();
252 // iterate through all entries sequentially
253 constantPoolHandle pool(THREAD, mh->constants());
254 for (int i = 0; i < length; i ++) {
255 //reacquire the table in case a GC happened
256 ExceptionTable table(mh());
257 int beg_bci = table.start_pc(i);
258 int end_bci = table.end_pc(i);
259 assert(beg_bci <= end_bci, "inconsistent exception table");
260 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
261 beg_bci, end_bci);
262
263 if (beg_bci <= throw_bci && throw_bci < end_bci) {
264 // exception handler bci range covers throw_bci => investigate further
265 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
266
267 int handler_bci = table.handler_pc(i);
268 int klass_index = table.catch_type_index(i);
269 if (klass_index == 0) {
270 if (log_is_enabled(Info, exceptions)) {
271 ResourceMark rm(THREAD);
272 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
273 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
274 }
275 return handler_bci;
276 } else if (ex_klass == nullptr) {
277 // Is this even possible?
278 if (log_is_enabled(Info, exceptions)) {
279 ResourceMark rm(THREAD);
280 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
281 mh()->name()->as_C_string(), handler_bci);
282 }
283 return handler_bci;
284 } else {
285 if (log_is_enabled(Debug, exceptions)) {
286 ResourceMark rm(THREAD);
287 log_debug(exceptions)(" - resolving catch type \"%s\"",
288 pool->klass_name_at(klass_index)->as_C_string());
289 }
290 // we know the exception class => get the constraint class
291 // this may require loading of the constraint class; if verification
292 // fails or some other exception occurs, return handler_bci
293 Klass* k = pool->klass_at(klass_index, THREAD);
294 if (HAS_PENDING_EXCEPTION) {
295 if (log_is_enabled(Debug, exceptions)) {
296 ResourceMark rm(THREAD);
297 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
298 PENDING_EXCEPTION->klass()->external_name());
299 }
300 return handler_bci;
301 }
302 assert(k != nullptr, "klass not loaded");
303 if (ex_klass->is_subtype_of(k)) {
304 if (log_is_enabled(Info, exceptions)) {
305 ResourceMark rm(THREAD);
306 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
307 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
308 }
309 return handler_bci;
310 }
311 }
312 }
313 }
314
315 if (log_is_enabled(Debug, exceptions)) {
316 ResourceMark rm(THREAD);
317 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
318 ex_klass->external_name(), mh->name()->as_C_string());
319 }
320
321 return -1;
322 }
323
324 void Method::mask_for(int bci, InterpreterOopMap* mask) {
325 methodHandle h_this(Thread::current(), this);
326 mask_for(h_this, bci, mask);
327 }
328
329 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
330 assert(this_mh() == this, "Sanity");
331 method_holder()->mask_for(this_mh, bci, mask);
332 }
333
334 int Method::bci_from(address bcp) const {
335 if (is_native() && bcp == nullptr) {
336 return 0;
337 }
338 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
339 // may call this after interrupting a nested ResourceMark.
340 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
341 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
342
343 return int(bcp - code_base());
344 }
345
346
347 int Method::validate_bci(int bci) const {
348 // Called from the verifier, and should return -1 if not valid.
349 return ((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size())) ? bci : -1;
350 }
351
352 // Return bci if it appears to be a valid bcp
353 // Return -1 otherwise.
354 // Used by profiling code, when invalid data is a possibility.
355 // The caller is responsible for validating the Method* itself.
356 int Method::validate_bci_from_bcp(address bcp) const {
357 // keep bci as -1 if not a valid bci
358 int bci = -1;
359 if (bcp == nullptr || bcp == code_base()) {
360 // code_size() may return 0 and we allow 0 here
361 // the method may be native
362 bci = 0;
363 } else if (contains(bcp)) {
364 bci = int(bcp - code_base());
365 }
366 // Assert that if we have dodged any asserts, bci is negative.
367 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
368 return bci;
369 }
370
371 address Method::bcp_from(int bci) const {
372 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
373 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
374 address bcp = code_base() + bci;
375 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
376 return bcp;
377 }
378
379 address Method::bcp_from(address bcp) const {
380 if (is_native() && bcp == nullptr) {
381 return code_base();
382 } else {
383 return bcp;
384 }
385 }
386
387 int Method::size(bool is_native) {
388 // If native, then include pointers for native_function and signature_handler
389 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
390 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
391 return align_metadata_size(header_size() + extra_words);
392 }
393
394 Symbol* Method::klass_name() const {
395 return method_holder()->name();
396 }
397
398 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
399 LogStreamHandle(Trace, aot) lsh;
400 if (lsh.is_enabled()) {
401 lsh.print("Iter(Method): %p ", this);
402 print_external_name(&lsh);
403 lsh.cr();
404 }
405 if (method_holder() != nullptr && !method_holder()->is_rewritten()) {
406 // holder is null for MH intrinsic methods
407 it->push(&_constMethod, MetaspaceClosure::_writable);
408 } else {
409 it->push(&_constMethod);
410 }
411 it->push(&_adapter);
412 it->push(&_method_data);
413 it->push(&_method_counters);
414 NOT_PRODUCT(it->push(&_name);)
415 }
416
417 #if INCLUDE_CDS
418 // Attempt to return method to original state. Clear any pointers
419 // (to objects outside the shared spaces). We won't be able to predict
420 // where they should point in a new JVM. Further initialize some
421 // entries now in order allow them to be write protected later.
422
423 void Method::remove_unshareable_info() {
424 unlink_method();
425 if (method_data() != nullptr) {
426 method_data()->remove_unshareable_info();
427 }
428 if (method_counters() != nullptr) {
429 method_counters()->remove_unshareable_info();
430 }
431 if (CDSConfig::is_dumping_adapters() && _adapter != nullptr) {
432 _adapter->remove_unshareable_info();
433 _adapter = nullptr;
434 }
435 if (method_data() != nullptr) {
436 method_data()->remove_unshareable_info();
437 }
438 if (method_counters() != nullptr) {
439 method_counters()->remove_unshareable_info();
440 }
441 JFR_ONLY(REMOVE_METHOD_ID(this);)
442 }
443
444 void Method::restore_unshareable_info(TRAPS) {
445 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
446 if (method_data() != nullptr) {
447 method_data()->restore_unshareable_info(CHECK);
448 }
449 if (method_counters() != nullptr) {
450 method_counters()->restore_unshareable_info(CHECK);
451 }
452 if (_adapter != nullptr) {
453 assert(_adapter->is_linked(), "must be");
454 _from_compiled_entry = _adapter->get_c2i_entry();
455 }
456 if (method_data() != nullptr) {
457 method_data()->restore_unshareable_info(CHECK);
458 }
459 if (method_counters() != nullptr) {
460 method_counters()->restore_unshareable_info(CHECK);
461 }
462 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
463 assert(!pending_queue_processed(), "method's pending_queued_processed flag should not be set");
464 }
465 #endif
466
467 void Method::set_vtable_index(int index) {
468 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
469 // At runtime initialize_vtable is rerun as part of link_class_impl()
470 // for a shared class loaded by the non-boot loader to obtain the loader
471 // constraints based on the runtime classloaders' context.
472 return; // don't write into the shared class
473 } else {
474 _vtable_index = index;
475 }
476 }
477
478 void Method::set_itable_index(int index) {
479 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
480 // At runtime initialize_itable is rerun as part of link_class_impl()
481 // for a shared class loaded by the non-boot loader to obtain the loader
482 // constraints based on the runtime classloaders' context. The dumptime
483 // itable index should be the same as the runtime index.
484 assert(_vtable_index == itable_index_max - index,
485 "archived itable index is different from runtime index");
486 return; // don't write into the shared class
487 } else {
488 _vtable_index = itable_index_max - index;
489 }
490 assert(valid_itable_index(), "");
491 }
492
493 // The RegisterNatives call being attempted tried to register with a method that
494 // is not native. Ask JVM TI what prefixes have been specified. Then check
495 // to see if the native method is now wrapped with the prefixes. See the
496 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
497 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
498 #if INCLUDE_JVMTI
499 ResourceMark rm(THREAD);
500 Method* method;
501 int name_len = name->utf8_length();
502 char* name_str = name->as_utf8();
503 int prefix_count;
504 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
505 for (int i = 0; i < prefix_count; i++) {
506 char* prefix = prefixes[i];
507 int prefix_len = (int)strlen(prefix);
508
509 // try adding this prefix to the method name and see if it matches another method name
510 int trial_len = name_len + prefix_len;
511 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
512 strcpy(trial_name_str, prefix);
513 strcat(trial_name_str, name_str);
514 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
515 if (trial_name == nullptr) {
516 continue; // no such symbol, so this prefix wasn't used, try the next prefix
517 }
518 method = k->lookup_method(trial_name, signature);
519 if (method == nullptr) {
520 continue; // signature doesn't match, try the next prefix
521 }
522 if (method->is_native()) {
523 method->set_is_prefixed_native();
524 return method; // wahoo, we found a prefixed version of the method, return it
525 }
526 // found as non-native, so prefix is good, add it, probably just need more prefixes
527 name_len = trial_len;
528 name_str = trial_name_str;
529 }
530 #endif // INCLUDE_JVMTI
531 return nullptr; // not found
532 }
533
534 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
535 Method* method = k->lookup_method(name, signature);
536 if (method == nullptr) {
537 ResourceMark rm(THREAD);
538 stringStream st;
539 st.print("Method '");
540 print_external_name(&st, k, name, signature);
541 st.print("' name or signature does not match");
542 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
543 }
544 if (!method->is_native()) {
545 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
546 method = find_prefixed_native(k, name, signature, THREAD);
547 if (method == nullptr) {
548 ResourceMark rm(THREAD);
549 stringStream st;
550 st.print("Method '");
551 print_external_name(&st, k, name, signature);
552 st.print("' is not declared as native");
553 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
554 }
555 }
556
557 if (entry != nullptr) {
558 method->set_native_function(entry, native_bind_event_is_interesting);
559 } else {
560 method->clear_native_function();
561 }
562 if (log_is_enabled(Debug, jni, resolve)) {
563 ResourceMark rm(THREAD);
564 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
565 method->method_holder()->external_name(),
566 method->name()->as_C_string());
567 }
568 return true;
569 }
570
571 bool Method::was_executed_more_than(int n) {
572 // Invocation counter is reset when the Method* is compiled.
573 // If the method has compiled code we therefore assume it has
574 // be executed more than n times.
575 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
576 // interpreter doesn't bump invocation counter of trivial methods
577 // compiler does not bump invocation counter of compiled methods
578 return true;
579 }
580 else if ((method_counters() != nullptr &&
581 method_counters()->invocation_counter()->carry()) ||
582 (method_data() != nullptr &&
583 method_data()->invocation_counter()->carry())) {
584 // The carry bit is set when the counter overflows and causes
585 // a compilation to occur. We don't know how many times
586 // the counter has been reset, so we simply assume it has
587 // been executed more than n times.
588 return true;
589 } else {
590 return invocation_count() > n;
591 }
592 }
593
594 void Method::print_invocation_count(outputStream* st) {
595 //---< compose+print method return type, klass, name, and signature >---
596 if (is_static()) { st->print("static "); }
597 if (is_final()) { st->print("final "); }
598 if (is_synchronized()) { st->print("synchronized "); }
599 if (is_native()) { st->print("native "); }
600 st->print("%s::", method_holder()->external_name());
601 name()->print_symbol_on(st);
602 signature()->print_symbol_on(st);
603
604 if (WizardMode) {
605 // dump the size of the byte codes
606 st->print(" {%d}", code_size());
607 }
608 st->cr();
609
610 // Counting based on signed int counters tends to overflow with
611 // longer-running workloads on fast machines. The counters under
612 // consideration here, however, are limited in range by counting
613 // logic. See InvocationCounter:count_limit for example.
614 // No "overflow precautions" need to be implemented here.
615 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
616 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
617 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
618
619 if (method_data() != nullptr) {
620 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
621 }
622
623 #ifndef PRODUCT
624 if (CountCompiledCalls) {
625 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
626 }
627 #endif
628 }
629
630 MethodTrainingData* Method::training_data_or_null() const {
631 MethodCounters* mcs = method_counters();
632 if (mcs == nullptr) {
633 return nullptr;
634 } else {
635 MethodTrainingData* mtd = mcs->method_training_data();
636 if (mtd == mcs->method_training_data_sentinel()) {
637 return nullptr;
638 }
639 return mtd;
640 }
641 }
642
643 bool Method::init_training_data(MethodTrainingData* td) {
644 MethodCounters* mcs = method_counters();
645 if (mcs == nullptr) {
646 return false;
647 } else {
648 return mcs->init_method_training_data(td);
649 }
650 }
651
652 bool Method::install_training_method_data(const methodHandle& method) {
653 MethodTrainingData* mtd = MethodTrainingData::find(method);
654 if (mtd != nullptr && mtd->final_profile() != nullptr) {
655 Atomic::replace_if_null(&method->_method_data, mtd->final_profile());
656 return true;
657 }
658 return false;
659 }
660
661 // Build a MethodData* object to hold profiling information collected on this
662 // method when requested.
663 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
664 if (install_training_method_data(method)) {
665 return;
666 }
667 // Do not profile the method if metaspace has hit an OOM previously
668 // allocating profiling data. Callers clear pending exception so don't
669 // add one here.
670 if (ClassLoaderDataGraph::has_metaspace_oom()) {
671 return;
672 }
673
674 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
675 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
676 if (HAS_PENDING_EXCEPTION) {
677 CompileBroker::log_metaspace_failure();
678 ClassLoaderDataGraph::set_metaspace_oom(true);
679 return; // return the exception (which is cleared)
680 }
681
682 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
683 MetadataFactory::free_metadata(loader_data, method_data);
684 return;
685 }
686
687 if (ForceProfiling && TrainingData::need_data()) {
688 MethodTrainingData* mtd = MethodTrainingData::make(method, false);
689 guarantee(mtd != nullptr, "");
690 }
691
692 if (PrintMethodData) {
693 ResourceMark rm(THREAD);
694 tty->print("build_profiling_method_data for ");
695 method->print_name(tty);
696 tty->cr();
697 // At the end of the run, the MDO, full of data, will be dumped.
698 }
699 }
700
701 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
702 // Do not profile the method if metaspace has hit an OOM previously
703 if (ClassLoaderDataGraph::has_metaspace_oom()) {
704 return nullptr;
705 }
706
707 methodHandle mh(current, m);
708 MethodCounters* counters;
709 if (current->is_Java_thread()) {
710 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
711 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
712 // if needed.
713 counters = MethodCounters::allocate_with_exception(mh, THREAD);
714 if (HAS_PENDING_EXCEPTION) {
715 CLEAR_PENDING_EXCEPTION;
716 }
717 } else {
718 // Call metaspace allocation that doesn't throw exception if the
719 // current thread isn't a JavaThread, ie. the VMThread.
720 counters = MethodCounters::allocate_no_exception(mh);
721 }
722
723 if (counters == nullptr) {
724 CompileBroker::log_metaspace_failure();
725 ClassLoaderDataGraph::set_metaspace_oom(true);
726 return nullptr;
727 }
728
729 if (!mh->init_method_counters(counters)) {
730 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
731 }
732
733 if (ForceProfiling && TrainingData::need_data()) {
734 MethodTrainingData* mtd = MethodTrainingData::make(mh, false);
735 guarantee(mtd != nullptr, "");
736 }
737
738 return mh->method_counters();
739 }
740
741 bool Method::init_method_counters(MethodCounters* counters) {
742 // Try to install a pointer to MethodCounters, return true on success.
743 return Atomic::replace_if_null(&_method_counters, counters);
744 }
745
746 void Method::set_exception_handler_entered(int handler_bci) {
747 if (ProfileExceptionHandlers) {
748 MethodData* mdo = method_data();
749 if (mdo != nullptr) {
750 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
751 handler_data.set_exception_handler_entered();
752 }
753 }
754 }
755
756 int Method::extra_stack_words() {
757 // not an inline function, to avoid a header dependency on Interpreter
758 return extra_stack_entries() * Interpreter::stackElementSize;
759 }
760
761 bool Method::compute_has_loops_flag() {
762 BytecodeStream bcs(methodHandle(Thread::current(), this));
763 Bytecodes::Code bc;
764
765 while ((bc = bcs.next()) >= 0) {
766 switch (bc) {
767 case Bytecodes::_ifeq:
768 case Bytecodes::_ifnull:
769 case Bytecodes::_iflt:
770 case Bytecodes::_ifle:
771 case Bytecodes::_ifne:
772 case Bytecodes::_ifnonnull:
773 case Bytecodes::_ifgt:
774 case Bytecodes::_ifge:
775 case Bytecodes::_if_icmpeq:
776 case Bytecodes::_if_icmpne:
777 case Bytecodes::_if_icmplt:
778 case Bytecodes::_if_icmpgt:
779 case Bytecodes::_if_icmple:
780 case Bytecodes::_if_icmpge:
781 case Bytecodes::_if_acmpeq:
782 case Bytecodes::_if_acmpne:
783 case Bytecodes::_goto:
784 case Bytecodes::_jsr:
785 if (bcs.dest() < bcs.next_bci()) {
786 return set_has_loops();
787 }
788 break;
789
790 case Bytecodes::_goto_w:
791 case Bytecodes::_jsr_w:
792 if (bcs.dest_w() < bcs.next_bci()) {
793 return set_has_loops();
794 }
795 break;
796
797 case Bytecodes::_lookupswitch: {
798 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
799 if (lookupswitch.default_offset() < 0) {
800 return set_has_loops();
801 } else {
802 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
803 LookupswitchPair pair = lookupswitch.pair_at(i);
804 if (pair.offset() < 0) {
805 return set_has_loops();
806 }
807 }
808 }
809 break;
810 }
811 case Bytecodes::_tableswitch: {
812 Bytecode_tableswitch tableswitch(this, bcs.bcp());
813 if (tableswitch.default_offset() < 0) {
814 return set_has_loops();
815 } else {
816 for (int i = 0; i < tableswitch.length(); ++i) {
817 if (tableswitch.dest_offset_at(i) < 0) {
818 return set_has_loops();
819 }
820 }
821 }
822 break;
823 }
824 default:
825 break;
826 }
827 }
828
829 _flags.set_has_loops_flag_init(true);
830 return false;
831 }
832
833 bool Method::is_final_method(AccessFlags class_access_flags) const {
834 // or "does_not_require_vtable_entry"
835 // default method or overpass can occur, is not final (reuses vtable entry)
836 // private methods in classes get vtable entries for backward class compatibility.
837 if (is_overpass() || is_default_method()) return false;
838 return is_final() || class_access_flags.is_final();
839 }
840
841 bool Method::is_final_method() const {
842 return is_final_method(method_holder()->access_flags());
843 }
844
845 bool Method::is_default_method() const {
846 if (method_holder() != nullptr &&
847 method_holder()->is_interface() &&
848 !is_abstract() && !is_private()) {
849 return true;
850 } else {
851 return false;
852 }
853 }
854
855 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
856 if (is_final_method(class_access_flags)) return true;
857 #ifdef ASSERT
858 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
859 if (class_access_flags.is_interface()) {
860 ResourceMark rm;
861 assert(is_nonv == is_static() || is_nonv == is_private(),
862 "nonvirtual unexpected for non-static, non-private: %s",
863 name_and_sig_as_C_string());
864 }
865 #endif
866 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
867 return vtable_index() == nonvirtual_vtable_index;
868 }
869
870 bool Method::can_be_statically_bound() const {
871 return can_be_statically_bound(method_holder()->access_flags());
872 }
873
874 bool Method::can_be_statically_bound(InstanceKlass* context) const {
875 return (method_holder() == context) && can_be_statically_bound();
876 }
877
878 /**
879 * Returns false if this is one of specially treated methods for
880 * which we have to provide stack trace in throw in compiled code.
881 * Returns true otherwise.
882 */
883 bool Method::can_omit_stack_trace() {
884 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
885 return false; // All methods in sun.invoke.util.ValueConversions
886 }
887 return true;
888 }
889
890 bool Method::is_accessor() const {
891 return is_getter() || is_setter();
892 }
893
894 bool Method::is_getter() const {
895 if (code_size() != 5) return false;
896 if (size_of_parameters() != 1) return false;
897 if (java_code_at(0) != Bytecodes::_aload_0) return false;
898 if (java_code_at(1) != Bytecodes::_getfield) return false;
899 switch (java_code_at(4)) {
900 case Bytecodes::_ireturn:
901 case Bytecodes::_lreturn:
902 case Bytecodes::_freturn:
903 case Bytecodes::_dreturn:
904 case Bytecodes::_areturn:
905 break;
906 default:
907 return false;
908 }
909 return true;
910 }
911
912 bool Method::is_setter() const {
913 if (code_size() != 6) return false;
914 if (java_code_at(0) != Bytecodes::_aload_0) return false;
915 switch (java_code_at(1)) {
916 case Bytecodes::_iload_1:
917 case Bytecodes::_aload_1:
918 case Bytecodes::_fload_1:
919 if (size_of_parameters() != 2) return false;
920 break;
921 case Bytecodes::_dload_1:
922 case Bytecodes::_lload_1:
923 if (size_of_parameters() != 3) return false;
924 break;
925 default:
926 return false;
927 }
928 if (java_code_at(2) != Bytecodes::_putfield) return false;
929 if (java_code_at(5) != Bytecodes::_return) return false;
930 return true;
931 }
932
933 bool Method::is_constant_getter() const {
934 int last_index = code_size() - 1;
935 // Check if the first 1-3 bytecodes are a constant push
936 // and the last bytecode is a return.
937 return (2 <= code_size() && code_size() <= 4 &&
938 Bytecodes::is_const(java_code_at(0)) &&
939 Bytecodes::length_for(java_code_at(0)) == last_index &&
940 Bytecodes::is_return(java_code_at(last_index)));
941 }
942
943 bool Method::has_valid_initializer_flags() const {
944 return (is_static() ||
945 method_holder()->major_version() < 51);
946 }
947
948 bool Method::is_static_initializer() const {
949 // For classfiles version 51 or greater, ensure that the clinit method is
950 // static. Non-static methods with the name "<clinit>" are not static
951 // initializers. (older classfiles exempted for backward compatibility)
952 return name() == vmSymbols::class_initializer_name() &&
953 has_valid_initializer_flags();
954 }
955
956 bool Method::is_object_initializer() const {
957 return name() == vmSymbols::object_initializer_name();
958 }
959
960 bool Method::needs_clinit_barrier() const {
961 return is_static() && !method_holder()->is_initialized();
962 }
963
964 bool Method::code_has_clinit_barriers() const {
965 nmethod* nm = code();
966 return (nm != nullptr) && nm->has_clinit_barriers();
967 }
968
969 bool Method::is_object_wait0() const {
970 return klass_name() == vmSymbols::java_lang_Object()
971 && name() == vmSymbols::wait_name();
972 }
973
974 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
975 int length = method->checked_exceptions_length();
976 if (length == 0) { // common case
977 return objArrayHandle(THREAD, Universe::the_empty_class_array());
978 } else {
979 methodHandle h_this(THREAD, method);
980 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
981 objArrayHandle mirrors (THREAD, m_oop);
982 for (int i = 0; i < length; i++) {
983 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
984 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
985 if (log_is_enabled(Warning, exceptions) &&
986 !k->is_subclass_of(vmClasses::Throwable_klass())) {
987 ResourceMark rm(THREAD);
988 log_warning(exceptions)(
989 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
990 k->external_name(), method->external_name());
991 }
992 mirrors->obj_at_put(i, k->java_mirror());
993 }
994 return mirrors;
995 }
996 };
997
998
999 int Method::line_number_from_bci(int bci) const {
1000 int best_bci = 0;
1001 int best_line = -1;
1002 if (bci == SynchronizationEntryBCI) bci = 0;
1003 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
1004 // The line numbers are a short array of 2-tuples [start_pc, line_number].
1005 // Not necessarily sorted and not necessarily one-to-one.
1006 CompressedLineNumberReadStream stream(compressed_linenumber_table());
1007 while (stream.read_pair()) {
1008 if (stream.bci() == bci) {
1009 // perfect match
1010 return stream.line();
1011 } else {
1012 // update best_bci/line
1013 if (stream.bci() < bci && stream.bci() >= best_bci) {
1014 best_bci = stream.bci();
1015 best_line = stream.line();
1016 }
1017 }
1018 }
1019 }
1020 return best_line;
1021 }
1022
1023
1024 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1025 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
1026 Thread *thread = Thread::current();
1027 Symbol* klass_name = constants()->klass_name_at(klass_index);
1028 Handle loader(thread, method_holder()->class_loader());
1029 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr;
1030 } else {
1031 return true;
1032 }
1033 }
1034
1035
1036 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1037 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1038 if (must_be_resolved) {
1039 // Make sure klass is resolved in constantpool.
1040 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
1041 }
1042 return is_klass_loaded_by_klass_index(klass_index);
1043 }
1044
1045
1046 void Method::set_native_function(address function, bool post_event_flag) {
1047 assert(function != nullptr, "use clear_native_function to unregister natives");
1048 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1049 address* native_function = native_function_addr();
1050
1051 // We can see racers trying to place the same native function into place. Once
1052 // is plenty.
1053 address current = *native_function;
1054 if (current == function) return;
1055 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1056 function != nullptr) {
1057 // native_method_throw_unsatisfied_link_error_entry() should only
1058 // be passed when post_event_flag is false.
1059 assert(function !=
1060 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1061 "post_event_flag mismatch");
1062
1063 // post the bind event, and possible change the bind function
1064 JvmtiExport::post_native_method_bind(this, &function);
1065 }
1066 *native_function = function;
1067 // This function can be called more than once. We must make sure that we always
1068 // use the latest registered method -> check if a stub already has been generated.
1069 // If so, we have to make it not_entrant.
1070 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1071 if (nm != nullptr) {
1072 nm->make_not_entrant("set native function");
1073 }
1074 }
1075
1076
1077 bool Method::has_native_function() const {
1078 if (is_special_native_intrinsic())
1079 return false; // special-cased in SharedRuntime::generate_native_wrapper
1080 address func = native_function();
1081 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1082 }
1083
1084
1085 void Method::clear_native_function() {
1086 // Note: is_method_handle_intrinsic() is allowed here.
1087 set_native_function(
1088 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1089 !native_bind_event_is_interesting);
1090 this->unlink_code();
1091 }
1092
1093
1094 void Method::set_signature_handler(address handler) {
1095 address* signature_handler = signature_handler_addr();
1096 *signature_handler = handler;
1097 }
1098
1099
1100 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1101 assert(reason != nullptr, "must provide a reason");
1102 if (PrintCompilation && report) {
1103 ttyLocker ttyl;
1104 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1105 if (comp_level == CompLevel_all) {
1106 tty->print("all levels ");
1107 } else {
1108 tty->print("level %d ", comp_level);
1109 }
1110 this->print_short_name(tty);
1111 int size = this->code_size();
1112 if (size > 0) {
1113 tty->print(" (%d bytes)", size);
1114 }
1115 if (reason != nullptr) {
1116 tty->print(" %s", reason);
1117 }
1118 tty->cr();
1119 }
1120 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1121 ttyLocker ttyl;
1122 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'",
1123 os::current_thread_id(), is_osr, comp_level);
1124 if (reason != nullptr) {
1125 xtty->print(" reason=\'%s\'", reason);
1126 }
1127 xtty->method(this);
1128 xtty->stamp();
1129 xtty->end_elem();
1130 }
1131 }
1132
1133 bool Method::is_always_compilable() const {
1134 // Generated adapters must be compiled
1135 if (is_special_native_intrinsic() && is_synthetic()) {
1136 assert(!is_not_c1_compilable(), "sanity check");
1137 assert(!is_not_c2_compilable(), "sanity check");
1138 return true;
1139 }
1140
1141 return false;
1142 }
1143
1144 bool Method::is_not_compilable(int comp_level) const {
1145 if (number_of_breakpoints() > 0)
1146 return true;
1147 if (is_always_compilable())
1148 return false;
1149 if (comp_level == CompLevel_any)
1150 return is_not_c1_compilable() && is_not_c2_compilable();
1151 if (is_c1_compile(comp_level))
1152 return is_not_c1_compilable();
1153 if (is_c2_compile(comp_level))
1154 return is_not_c2_compilable();
1155 return false;
1156 }
1157
1158 // call this when compiler finds that this method is not compilable
1159 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1160 if (is_always_compilable()) {
1161 // Don't mark a method which should be always compilable
1162 return;
1163 }
1164 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1165 if (comp_level == CompLevel_all) {
1166 set_is_not_c1_compilable();
1167 set_is_not_c2_compilable();
1168 } else {
1169 if (is_c1_compile(comp_level))
1170 set_is_not_c1_compilable();
1171 if (is_c2_compile(comp_level))
1172 set_is_not_c2_compilable();
1173 }
1174 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1175 }
1176
1177 bool Method::is_not_osr_compilable(int comp_level) const {
1178 if (is_not_compilable(comp_level))
1179 return true;
1180 if (comp_level == CompLevel_any)
1181 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1182 if (is_c1_compile(comp_level))
1183 return is_not_c1_osr_compilable();
1184 if (is_c2_compile(comp_level))
1185 return is_not_c2_osr_compilable();
1186 return false;
1187 }
1188
1189 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1190 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1191 if (comp_level == CompLevel_all) {
1192 set_is_not_c1_osr_compilable();
1193 set_is_not_c2_osr_compilable();
1194 } else {
1195 if (is_c1_compile(comp_level))
1196 set_is_not_c1_osr_compilable();
1197 if (is_c2_compile(comp_level))
1198 set_is_not_c2_osr_compilable();
1199 }
1200 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1201 }
1202
1203 // Revert to using the interpreter and clear out the nmethod
1204 void Method::clear_code() {
1205 // this may be null if c2i adapters have not been made yet
1206 // Only should happen at allocate time.
1207 if (adapter() == nullptr) {
1208 _from_compiled_entry = nullptr;
1209 } else {
1210 _from_compiled_entry = adapter()->get_c2i_entry();
1211 }
1212 OrderAccess::storestore();
1213 _from_interpreted_entry = _i2i_entry;
1214 OrderAccess::storestore();
1215 _code = nullptr;
1216 }
1217
1218 void Method::unlink_code(nmethod *compare) {
1219 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1220 // We need to check if either the _code or _from_compiled_code_entry_point
1221 // refer to this nmethod because there is a race in setting these two fields
1222 // in Method* as seen in bugid 4947125.
1223 if (code() == compare ||
1224 from_compiled_entry() == compare->verified_entry_point()) {
1225 clear_code();
1226 }
1227 }
1228
1229 void Method::unlink_code() {
1230 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1231 clear_code();
1232 }
1233
1234 #if INCLUDE_CDS
1235 // Called by class data sharing to remove any entry points (which are not shared)
1236 void Method::unlink_method() {
1237 assert(CDSConfig::is_dumping_archive(), "sanity");
1238 _code = nullptr;
1239 if (!CDSConfig::is_dumping_adapters() || AdapterHandlerLibrary::is_abstract_method_adapter(_adapter)) {
1240 _adapter = nullptr;
1241 }
1242 _i2i_entry = nullptr;
1243 _from_compiled_entry = nullptr;
1244 _from_interpreted_entry = nullptr;
1245
1246 if (is_native()) {
1247 *native_function_addr() = nullptr;
1248 set_signature_handler(nullptr);
1249 }
1250 NOT_PRODUCT(set_compiled_invocation_count(0);)
1251
1252 clear_method_data();
1253 clear_method_counters();
1254 clear_is_not_c1_compilable();
1255 clear_is_not_c1_osr_compilable();
1256 clear_is_not_c2_compilable();
1257 clear_is_not_c2_osr_compilable();
1258 clear_queued_for_compilation();
1259 set_pending_queue_processed(false);
1260
1261 remove_unshareable_flags();
1262 }
1263
1264 void Method::remove_unshareable_flags() {
1265 // clear all the flags that shouldn't be in the archived version
1266 assert(!is_old(), "must be");
1267 assert(!is_obsolete(), "must be");
1268 assert(!is_deleted(), "must be");
1269
1270 set_is_prefixed_native(false);
1271 set_queued_for_compilation(false);
1272 set_pending_queue_processed(false);
1273 set_is_not_c2_compilable(false);
1274 set_is_not_c1_compilable(false);
1275 set_is_not_c2_osr_compilable(false);
1276 set_on_stack_flag(false);
1277 set_has_upcall_on_method_entry(false);
1278 set_has_upcall_on_method_exit(false);
1279 }
1280 #endif
1281
1282 // Called when the method_holder is getting linked. Setup entrypoints so the method
1283 // is ready to be called from interpreter, compiler, and vtables.
1284 void Method::link_method(const methodHandle& h_method, TRAPS) {
1285 if (log_is_enabled(Info, perf, class, link)) {
1286 ClassLoader::perf_ik_link_methods_count()->inc();
1287 }
1288
1289 // If the code cache is full, we may reenter this function for the
1290 // leftover methods that weren't linked.
1291 if (adapter() != nullptr) {
1292 if (adapter()->is_shared()) {
1293 assert(adapter()->is_linked(), "Adapter is shared but not linked");
1294 } else {
1295 return;
1296 }
1297 }
1298 assert( _code == nullptr, "nothing compiled yet" );
1299
1300 // Setup interpreter entrypoint
1301 assert(this == h_method(), "wrong h_method()" );
1302
1303 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache");
1304 address entry = Interpreter::entry_for_method(h_method);
1305 assert(entry != nullptr, "interpreter entry must be non-null");
1306 // Sets both _i2i_entry and _from_interpreted_entry
1307 set_interpreter_entry(entry);
1308
1309 // Don't overwrite already registered native entries.
1310 if (is_native() && !has_native_function()) {
1311 set_native_function(
1312 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1313 !native_bind_event_is_interesting);
1314 }
1315
1316 // Setup compiler entrypoint. This is made eagerly, so we do not need
1317 // special handling of vtables. An alternative is to make adapters more
1318 // lazily by calling make_adapter() from from_compiled_entry() for the
1319 // normal calls. For vtable calls life gets more complicated. When a
1320 // call-site goes mega-morphic we need adapters in all methods which can be
1321 // called from the vtable. We need adapters on such methods that get loaded
1322 // later. Ditto for mega-morphic itable calls. If this proves to be a
1323 // problem we'll make these lazily later.
1324 if (_adapter == nullptr) {
1325 (void) make_adapters(h_method, CHECK);
1326 assert(adapter()->is_linked(), "Adapter must have been linked");
1327 }
1328
1329 // ONLY USE the h_method now as make_adapter may have blocked
1330
1331 if (h_method->is_continuation_native_intrinsic()) {
1332 _from_interpreted_entry = nullptr;
1333 _from_compiled_entry = nullptr;
1334 _i2i_entry = nullptr;
1335 if (Continuations::enabled()) {
1336 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1337 AdapterHandlerLibrary::create_native_wrapper(h_method);
1338 if (!h_method->has_compiled_code()) {
1339 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1340 }
1341 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1342 }
1343 }
1344 if (_preload_code != nullptr && !_aot_code_entry->not_entrant()) {
1345 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1346 set_code(h_method, _preload_code);
1347 assert(((nmethod*)_preload_code)->aot_code_entry() == _aot_code_entry, "sanity");
1348 }
1349 }
1350
1351 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1352 PerfTraceElapsedTime timer(ClassLoader::perf_method_adapters_time());
1353
1354 // Adapters for compiled code are made eagerly here. They are fairly
1355 // small (generally < 100 bytes) and quick to make (and cached and shared)
1356 // so making them eagerly shouldn't be too expensive.
1357 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1358 if (adapter == nullptr ) {
1359 if (!is_init_completed()) {
1360 // Don't throw exceptions during VM initialization because java.lang.* classes
1361 // might not have been initialized, causing problems when constructing the
1362 // Java exception object.
1363 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1364 } else {
1365 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1366 }
1367 }
1368
1369 mh->set_adapter_entry(adapter);
1370 mh->_from_compiled_entry = adapter->get_c2i_entry();
1371 return adapter->get_c2i_entry();
1372 }
1373
1374 // The verified_code_entry() must be called when a invoke is resolved
1375 // on this method.
1376
1377 // It returns the compiled code entry point, after asserting not null.
1378 // This function is called after potential safepoints so that nmethod
1379 // or adapter that it points to is still live and valid.
1380 // This function must not hit a safepoint!
1381 address Method::verified_code_entry() {
1382 DEBUG_ONLY(NoSafepointVerifier nsv;)
1383 assert(_from_compiled_entry != nullptr, "must be set");
1384 return _from_compiled_entry;
1385 }
1386
1387 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1388 // (could be racing a deopt).
1389 // Not inline to avoid circular ref.
1390 bool Method::check_code() const {
1391 // cached in a register or local. There's a race on the value of the field.
1392 nmethod *code = Atomic::load_acquire(&_code);
1393 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1394 }
1395
1396 // Install compiled code. Instantly it can execute.
1397 void Method::set_code(const methodHandle& mh, nmethod *code) {
1398 assert_lock_strong(NMethodState_lock);
1399 assert( code, "use clear_code to remove code" );
1400 assert( mh->check_code(), "" );
1401
1402 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1403
1404 // These writes must happen in this order, because the interpreter will
1405 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1406 // which jumps to _from_compiled_entry.
1407 mh->_code = code; // Assign before allowing compiled code to exec
1408
1409 int comp_level = code->comp_level();
1410 // In theory there could be a race here. In practice it is unlikely
1411 // and not worth worrying about.
1412 if (comp_level > mh->highest_comp_level()) {
1413 mh->set_highest_comp_level(comp_level);
1414 }
1415
1416 OrderAccess::storestore();
1417 mh->_from_compiled_entry = code->verified_entry_point();
1418 OrderAccess::storestore();
1419
1420 if (mh->is_continuation_native_intrinsic()) {
1421 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1422
1423 if (mh->is_continuation_enter_intrinsic()) {
1424 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1425 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1426 } else if (mh->is_continuation_yield_intrinsic()) {
1427 mh->_i2i_entry = mh->get_i2c_entry();
1428 } else {
1429 guarantee(false, "Unknown Continuation native intrinsic");
1430 }
1431 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1432 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1433 } else if (!mh->is_method_handle_intrinsic()) {
1434 // Instantly compiled code can execute.
1435 mh->_from_interpreted_entry = mh->get_i2c_entry();
1436 }
1437 }
1438
1439
1440 bool Method::is_overridden_in(Klass* k) const {
1441 InstanceKlass* ik = InstanceKlass::cast(k);
1442
1443 if (ik->is_interface()) return false;
1444
1445 // If method is an interface, we skip it - except if it
1446 // is a miranda method
1447 if (method_holder()->is_interface()) {
1448 // Check that method is not a miranda method
1449 if (ik->lookup_method(name(), signature()) == nullptr) {
1450 // No implementation exist - so miranda method
1451 return false;
1452 }
1453 return true;
1454 }
1455
1456 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1457 if (!has_vtable_index()) {
1458 return false;
1459 } else {
1460 Method* vt_m = ik->method_at_vtable(vtable_index());
1461 return vt_m != this;
1462 }
1463 }
1464
1465
1466 // give advice about whether this Method* should be cached or not
1467 bool Method::should_not_be_cached() const {
1468 if (is_old()) {
1469 // This method has been redefined. It is either EMCP or obsolete
1470 // and we don't want to cache it because that would pin the method
1471 // down and prevent it from being collectible if and when it
1472 // finishes executing.
1473 return true;
1474 }
1475
1476 // caching this method should be just fine
1477 return false;
1478 }
1479
1480
1481 /**
1482 * Returns true if this is one of the specially treated methods for
1483 * security related stack walks (like Reflection.getCallerClass).
1484 */
1485 bool Method::is_ignored_by_security_stack_walk() const {
1486 if (intrinsic_id() == vmIntrinsics::_invoke) {
1487 // This is Method.invoke() -- ignore it
1488 return true;
1489 }
1490 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1491 // This is an auxiliary frame -- ignore it
1492 return true;
1493 }
1494 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1495 // This is an internal adapter frame for method handles -- ignore it
1496 return true;
1497 }
1498 return false;
1499 }
1500
1501
1502 // Constant pool structure for invoke methods:
1503 enum {
1504 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1505 _imcp_invoke_signature, // utf8: (variable Symbol*)
1506 _imcp_limit
1507 };
1508
1509 // Test if this method is an MH adapter frame generated by Java code.
1510 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1511 bool Method::is_compiled_lambda_form() const {
1512 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1513 }
1514
1515 // Test if this method is an internal MH primitive method.
1516 bool Method::is_method_handle_intrinsic() const {
1517 vmIntrinsics::ID iid = intrinsic_id();
1518 return (MethodHandles::is_signature_polymorphic(iid) &&
1519 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1520 }
1521
1522 bool Method::has_member_arg() const {
1523 vmIntrinsics::ID iid = intrinsic_id();
1524 return (MethodHandles::is_signature_polymorphic(iid) &&
1525 MethodHandles::has_member_arg(iid));
1526 }
1527
1528 // Make an instance of a signature-polymorphic internal MH primitive.
1529 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1530 Symbol* signature,
1531 TRAPS) {
1532 ResourceMark rm(THREAD);
1533 methodHandle empty;
1534
1535 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1536 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1537 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1538
1539 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1540
1541 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1542 name->increment_refcount();
1543 signature->increment_refcount();
1544
1545 int cp_length = _imcp_limit;
1546 ClassLoaderData* loader_data = holder->class_loader_data();
1547 constantPoolHandle cp;
1548 {
1549 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1550 cp = constantPoolHandle(THREAD, cp_oop);
1551 }
1552 cp->copy_fields(holder->constants());
1553 cp->set_pool_holder(holder);
1554 cp->symbol_at_put(_imcp_invoke_name, name);
1555 cp->symbol_at_put(_imcp_invoke_signature, signature);
1556 cp->set_has_preresolution();
1557 cp->set_is_for_method_handle_intrinsic();
1558
1559 // decide on access bits: public or not?
1560 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1561 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1562 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1563 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1564
1565 methodHandle m;
1566 {
1567 InlineTableSizes sizes;
1568 Method* m_oop = Method::allocate(loader_data, 0,
1569 accessFlags_from(flags_bits), &sizes,
1570 ConstMethod::NORMAL,
1571 name,
1572 CHECK_(empty));
1573 m = methodHandle(THREAD, m_oop);
1574 }
1575 m->set_constants(cp());
1576 m->set_name_index(_imcp_invoke_name);
1577 m->set_signature_index(_imcp_invoke_signature);
1578 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1579 assert(m->signature() == signature, "");
1580 m->constMethod()->compute_from_signature(signature, must_be_static);
1581 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1582 assert(m->is_method_handle_intrinsic(), "");
1583 #ifdef ASSERT
1584 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1585 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1586 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1587 #endif //ASSERT
1588
1589 // Finally, set up its entry points.
1590 assert(m->can_be_statically_bound(), "");
1591 m->set_vtable_index(Method::nonvirtual_vtable_index);
1592 m->link_method(m, CHECK_(empty));
1593
1594 if (iid == vmIntrinsics::_linkToNative) {
1595 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1596 }
1597 if (log_is_enabled(Debug, methodhandles)) {
1598 LogTarget(Debug, methodhandles) lt;
1599 LogStream ls(lt);
1600 m->print_on(&ls);
1601 }
1602
1603 return m;
1604 }
1605
1606 #if INCLUDE_CDS
1607 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1608 if (m->adapter() != nullptr) {
1609 m->set_from_compiled_entry(m->adapter()->get_c2i_entry());
1610 }
1611 m->link_method(m, CHECK);
1612
1613 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1614 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1615 }
1616 }
1617 #endif
1618
1619 Klass* Method::check_non_bcp_klass(Klass* klass) {
1620 if (klass != nullptr && klass->class_loader() != nullptr) {
1621 if (klass->is_objArray_klass())
1622 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1623 return klass;
1624 }
1625 return nullptr;
1626 }
1627
1628
1629 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1630 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1631 // Code below does not work for native methods - they should never get rewritten anyway
1632 assert(!m->is_native(), "cannot rewrite native methods");
1633 // Allocate new Method*
1634 AccessFlags flags = m->access_flags();
1635
1636 ConstMethod* cm = m->constMethod();
1637 int checked_exceptions_len = cm->checked_exceptions_length();
1638 int localvariable_len = cm->localvariable_table_length();
1639 int exception_table_len = cm->exception_table_length();
1640 int method_parameters_len = cm->method_parameters_length();
1641 int method_annotations_len = cm->method_annotations_length();
1642 int parameter_annotations_len = cm->parameter_annotations_length();
1643 int type_annotations_len = cm->type_annotations_length();
1644 int default_annotations_len = cm->default_annotations_length();
1645
1646 InlineTableSizes sizes(
1647 localvariable_len,
1648 new_compressed_linenumber_size,
1649 exception_table_len,
1650 checked_exceptions_len,
1651 method_parameters_len,
1652 cm->generic_signature_index(),
1653 method_annotations_len,
1654 parameter_annotations_len,
1655 type_annotations_len,
1656 default_annotations_len,
1657 0);
1658
1659 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1660 Method* newm_oop = Method::allocate(loader_data,
1661 new_code_length,
1662 flags,
1663 &sizes,
1664 m->method_type(),
1665 m->name(),
1666 CHECK_(methodHandle()));
1667 methodHandle newm (THREAD, newm_oop);
1668
1669 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1670 ConstMethod* newcm = newm->constMethod();
1671 int new_const_method_size = newm->constMethod()->size();
1672
1673 // This works because the source and target are both Methods. Some compilers
1674 // (e.g., clang) complain that the target vtable pointer will be stomped,
1675 // so cast away newm()'s and m()'s Methodness.
1676 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1677
1678 // Create shallow copy of ConstMethod.
1679 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1680
1681 // Reset correct method/const method, method size, and parameter info
1682 newm->set_constMethod(newcm);
1683 newm->constMethod()->set_code_size(new_code_length);
1684 newm->constMethod()->set_constMethod_size(new_const_method_size);
1685 assert(newm->code_size() == new_code_length, "check");
1686 assert(newm->method_parameters_length() == method_parameters_len, "check");
1687 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1688 assert(newm->exception_table_length() == exception_table_len, "check");
1689 assert(newm->localvariable_table_length() == localvariable_len, "check");
1690 // Copy new byte codes
1691 memcpy(newm->code_base(), new_code, new_code_length);
1692 // Copy line number table
1693 if (new_compressed_linenumber_size > 0) {
1694 memcpy(newm->compressed_linenumber_table(),
1695 new_compressed_linenumber_table,
1696 new_compressed_linenumber_size);
1697 }
1698 // Copy method_parameters
1699 if (method_parameters_len > 0) {
1700 memcpy(newm->method_parameters_start(),
1701 m->method_parameters_start(),
1702 method_parameters_len * sizeof(MethodParametersElement));
1703 }
1704 // Copy checked_exceptions
1705 if (checked_exceptions_len > 0) {
1706 memcpy(newm->checked_exceptions_start(),
1707 m->checked_exceptions_start(),
1708 checked_exceptions_len * sizeof(CheckedExceptionElement));
1709 }
1710 // Copy exception table
1711 if (exception_table_len > 0) {
1712 memcpy(newm->exception_table_start(),
1713 m->exception_table_start(),
1714 exception_table_len * sizeof(ExceptionTableElement));
1715 }
1716 // Copy local variable number table
1717 if (localvariable_len > 0) {
1718 memcpy(newm->localvariable_table_start(),
1719 m->localvariable_table_start(),
1720 localvariable_len * sizeof(LocalVariableTableElement));
1721 }
1722 // Copy stackmap table
1723 if (m->has_stackmap_table()) {
1724 int code_attribute_length = m->stackmap_data()->length();
1725 Array<u1>* stackmap_data =
1726 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1727 memcpy((void*)stackmap_data->adr_at(0),
1728 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1729 newm->set_stackmap_data(stackmap_data);
1730 }
1731
1732 // copy annotations over to new method
1733 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1734 return newm;
1735 }
1736
1737 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1738 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1739 // because we are not loading from core libraries
1740 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1741 // which does not use the class default class loader so we check for its loader here
1742 const InstanceKlass* ik = InstanceKlass::cast(holder);
1743 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1744 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1745 }
1746
1747 // see if the klass name is well-known:
1748 Symbol* klass_name = ik->name();
1749 vmSymbolID id = vmSymbols::find_sid(klass_name);
1750 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1751 return id;
1752 } else {
1753 return vmSymbolID::NO_SID;
1754 }
1755 }
1756
1757 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1758 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1759 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1760 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1761 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1762
1763 // the klass name is well-known:
1764 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1765 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1766
1767 // ditto for method and signature:
1768 vmSymbolID name_id = vmSymbols::find_sid(name());
1769 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1770 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1771 && name_id == vmSymbolID::NO_SID) {
1772 return;
1773 }
1774 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1775 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1776 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1777 && sig_id == vmSymbolID::NO_SID) {
1778 return;
1779 }
1780
1781 u2 flags = access_flags().as_method_flags();
1782 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1783 if (id != vmIntrinsics::_none) {
1784 set_intrinsic_id(id);
1785 if (id == vmIntrinsics::_Class_cast) {
1786 // Even if the intrinsic is rejected, we want to inline this simple method.
1787 set_force_inline();
1788 }
1789 return;
1790 }
1791
1792 // A few slightly irregular cases:
1793 switch (klass_id) {
1794 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1795 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1796 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1797 if (!is_native()) break;
1798 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1799 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1800 id = vmIntrinsics::_none;
1801 break;
1802
1803 default:
1804 break;
1805 }
1806
1807 if (id != vmIntrinsics::_none) {
1808 // Set up its iid. It is an alias method.
1809 set_intrinsic_id(id);
1810 return;
1811 }
1812 }
1813
1814 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1815 if (!THREAD->can_call_java()) {
1816 // There is nothing useful this routine can do from within the Compile thread.
1817 // Hopefully, the signature contains only well-known classes.
1818 // We could scan for this and return true/false, but the caller won't care.
1819 return false;
1820 }
1821 bool sig_is_loaded = true;
1822 ResourceMark rm(THREAD);
1823 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1824 if (ss.is_reference()) {
1825 // load everything, including arrays "[Lfoo;"
1826 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1827 // We are loading classes eagerly. If a ClassNotFoundException or
1828 // a LinkageError was generated, be sure to ignore it.
1829 if (HAS_PENDING_EXCEPTION) {
1830 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1831 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1832 CLEAR_PENDING_EXCEPTION;
1833 } else {
1834 return false;
1835 }
1836 }
1837 if( klass == nullptr) { sig_is_loaded = false; }
1838 }
1839 }
1840 return sig_is_loaded;
1841 }
1842
1843 // Exposed so field engineers can debug VM
1844 void Method::print_short_name(outputStream* st) const {
1845 ResourceMark rm;
1846 #ifdef PRODUCT
1847 st->print(" %s::", method_holder()->external_name());
1848 #else
1849 st->print(" %s::", method_holder()->internal_name());
1850 #endif
1851 name()->print_symbol_on(st);
1852 if (WizardMode) signature()->print_symbol_on(st);
1853 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1854 MethodHandles::print_as_basic_type_signature_on(st, signature());
1855 }
1856
1857 // Comparer for sorting an object array containing
1858 // Method*s.
1859 static int method_comparator(Method* a, Method* b) {
1860 return a->name()->fast_compare(b->name());
1861 }
1862
1863 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1864 // default_methods also uses this without the ordering for fast find_method
1865 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1866 int length = methods->length();
1867 if (length > 1) {
1868 if (func == nullptr) {
1869 func = method_comparator;
1870 }
1871 {
1872 NoSafepointVerifier nsv;
1873 QuickSort::sort(methods->data(), length, func);
1874 }
1875 // Reset method ordering
1876 if (set_idnums) {
1877 for (u2 i = 0; i < length; i++) {
1878 Method* m = methods->at(i);
1879 m->set_method_idnum(i);
1880 m->set_orig_method_idnum(i);
1881 }
1882 }
1883 }
1884 }
1885
1886 //-----------------------------------------------------------------------------------
1887 // Non-product code unless JVM/TI needs it
1888
1889 #if !defined(PRODUCT) || INCLUDE_JVMTI
1890 class SignatureTypePrinter : public SignatureTypeNames {
1891 private:
1892 outputStream* _st;
1893 bool _use_separator;
1894
1895 void type_name(const char* name) {
1896 if (_use_separator) _st->print(", ");
1897 _st->print("%s", name);
1898 _use_separator = true;
1899 }
1900
1901 public:
1902 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1903 _st = st;
1904 _use_separator = false;
1905 }
1906
1907 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1908 void print_returntype() { _use_separator = false; do_type(return_type()); }
1909 };
1910
1911
1912 void Method::print_name(outputStream* st) const {
1913 Thread *thread = Thread::current();
1914 ResourceMark rm(thread);
1915 st->print("%s ", is_static() ? "static" : "virtual");
1916 if (WizardMode) {
1917 st->print("%s.", method_holder()->internal_name());
1918 name()->print_symbol_on(st);
1919 signature()->print_symbol_on(st);
1920 } else {
1921 SignatureTypePrinter sig(signature(), st);
1922 sig.print_returntype();
1923 st->print(" %s.", method_holder()->internal_name());
1924 name()->print_symbol_on(st);
1925 st->print("(");
1926 sig.print_parameters();
1927 st->print(")");
1928 }
1929 }
1930 #endif // !PRODUCT || INCLUDE_JVMTI
1931
1932
1933 void Method::print_codes_on(outputStream* st, int flags) const {
1934 print_codes_on(0, code_size(), st, flags);
1935 }
1936
1937 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1938 Thread *thread = Thread::current();
1939 ResourceMark rm(thread);
1940 methodHandle mh (thread, (Method*)this);
1941 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1942 }
1943
1944 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1945 _bci = 0;
1946 _line = 0;
1947 };
1948
1949 bool CompressedLineNumberReadStream::read_pair() {
1950 jubyte next = read_byte();
1951 // Check for terminator
1952 if (next == 0) return false;
1953 if (next == 0xFF) {
1954 // Escape character, regular compression used
1955 _bci += read_signed_int();
1956 _line += read_signed_int();
1957 } else {
1958 // Single byte compression used
1959 _bci += next >> 3;
1960 _line += next & 0x7;
1961 }
1962 return true;
1963 }
1964
1965 #if INCLUDE_JVMTI
1966
1967 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1968 BreakpointInfo* bp = method_holder()->breakpoints();
1969 for (; bp != nullptr; bp = bp->next()) {
1970 if (bp->match(this, bci)) {
1971 return bp->orig_bytecode();
1972 }
1973 }
1974 {
1975 ResourceMark rm;
1976 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1977 }
1978 return Bytecodes::_shouldnotreachhere;
1979 }
1980
1981 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1982 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1983 BreakpointInfo* bp = method_holder()->breakpoints();
1984 for (; bp != nullptr; bp = bp->next()) {
1985 if (bp->match(this, bci)) {
1986 bp->set_orig_bytecode(code);
1987 // and continue, in case there is more than one
1988 }
1989 }
1990 }
1991
1992 void Method::set_breakpoint(int bci) {
1993 InstanceKlass* ik = method_holder();
1994 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1995 bp->set_next(ik->breakpoints());
1996 ik->set_breakpoints(bp);
1997 // do this last:
1998 bp->set(this);
1999 }
2000
2001 static void clear_matches(Method* m, int bci) {
2002 InstanceKlass* ik = m->method_holder();
2003 BreakpointInfo* prev_bp = nullptr;
2004 BreakpointInfo* next_bp;
2005 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
2006 next_bp = bp->next();
2007 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
2008 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
2009 // do this first:
2010 bp->clear(m);
2011 // unhook it
2012 if (prev_bp != nullptr)
2013 prev_bp->set_next(next_bp);
2014 else
2015 ik->set_breakpoints(next_bp);
2016 delete bp;
2017 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
2018 // at same location. So we have multiple matching (method_index and bci)
2019 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
2020 // breakpoint for clear_breakpoint request and keep all other method versions
2021 // BreakpointInfo for future clear_breakpoint request.
2022 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
2023 // which is being called when class is unloaded. We delete all the Breakpoint
2024 // information for all versions of method. We may not correctly restore the original
2025 // bytecode in all method versions, but that is ok. Because the class is being unloaded
2026 // so these methods won't be used anymore.
2027 if (bci >= 0) {
2028 break;
2029 }
2030 } else {
2031 // This one is a keeper.
2032 prev_bp = bp;
2033 }
2034 }
2035 }
2036
2037 void Method::clear_breakpoint(int bci) {
2038 assert(bci >= 0, "");
2039 clear_matches(this, bci);
2040 }
2041
2042 void Method::clear_all_breakpoints() {
2043 clear_matches(this, -1);
2044 }
2045
2046 #endif // INCLUDE_JVMTI
2047
2048 int Method::highest_osr_comp_level() const {
2049 const MethodCounters* mcs = method_counters();
2050 if (mcs != nullptr) {
2051 return mcs->highest_osr_comp_level();
2052 } else {
2053 return CompLevel_none;
2054 }
2055 }
2056
2057 void Method::set_highest_comp_level(int level) {
2058 MethodCounters* mcs = method_counters();
2059 if (mcs != nullptr) {
2060 mcs->set_highest_comp_level(level);
2061 }
2062 }
2063
2064 void Method::set_highest_osr_comp_level(int level) {
2065 MethodCounters* mcs = method_counters();
2066 if (mcs != nullptr) {
2067 mcs->set_highest_osr_comp_level(level);
2068 }
2069 }
2070
2071 #if INCLUDE_JVMTI
2072
2073 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2074 _bci = bci;
2075 _name_index = m->name_index();
2076 _signature_index = m->signature_index();
2077 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2078 if (_orig_bytecode == Bytecodes::_breakpoint)
2079 _orig_bytecode = m->orig_bytecode_at(_bci);
2080 _next = nullptr;
2081 }
2082
2083 void BreakpointInfo::set(Method* method) {
2084 #ifdef ASSERT
2085 {
2086 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2087 if (code == Bytecodes::_breakpoint)
2088 code = method->orig_bytecode_at(_bci);
2089 assert(orig_bytecode() == code, "original bytecode must be the same");
2090 }
2091 #endif
2092 Thread *thread = Thread::current();
2093 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2094 method->incr_number_of_breakpoints(thread);
2095 {
2096 // Deoptimize all dependents on this method
2097 HandleMark hm(thread);
2098 methodHandle mh(thread, method);
2099 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2100 }
2101 }
2102
2103 void BreakpointInfo::clear(Method* method) {
2104 *method->bcp_from(_bci) = orig_bytecode();
2105 assert(method->number_of_breakpoints() > 0, "must not go negative");
2106 method->decr_number_of_breakpoints(Thread::current());
2107 }
2108
2109 #endif // INCLUDE_JVMTI
2110
2111 // jmethodID handling
2112
2113 // This is a block allocating object, sort of like JNIHandleBlock, only a
2114 // lot simpler.
2115 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2116 // never get rid of it.
2117
2118 static const int min_block_size = 8;
2119
2120 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2121 friend class JNIMethodBlock;
2122 Method** _methods;
2123 int _number_of_methods;
2124 int _top;
2125 JNIMethodBlockNode* _next;
2126
2127 public:
2128
2129 JNIMethodBlockNode(int num_methods = min_block_size);
2130
2131 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2132
2133 void ensure_methods(int num_addl_methods) {
2134 if (_top < _number_of_methods) {
2135 num_addl_methods -= _number_of_methods - _top;
2136 if (num_addl_methods <= 0) {
2137 return;
2138 }
2139 }
2140 if (_next == nullptr) {
2141 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2142 } else {
2143 _next->ensure_methods(num_addl_methods);
2144 }
2145 }
2146 };
2147
2148 class JNIMethodBlock : public CHeapObj<mtClass> {
2149 JNIMethodBlockNode _head;
2150 JNIMethodBlockNode *_last_free;
2151 public:
2152 static Method* const _free_method;
2153
2154 JNIMethodBlock(int initial_capacity = min_block_size)
2155 : _head(initial_capacity), _last_free(&_head) {}
2156
2157 void ensure_methods(int num_addl_methods) {
2158 _last_free->ensure_methods(num_addl_methods);
2159 }
2160
2161 Method** add_method(Method* m) {
2162 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2163 if (b->_top < b->_number_of_methods) {
2164 // top points to the next free entry.
2165 int i = b->_top;
2166 b->_methods[i] = m;
2167 b->_top++;
2168 _last_free = b;
2169 return &(b->_methods[i]);
2170 } else if (b->_top == b->_number_of_methods) {
2171 // if the next free entry ran off the block see if there's a free entry
2172 for (int i = 0; i < b->_number_of_methods; i++) {
2173 if (b->_methods[i] == _free_method) {
2174 b->_methods[i] = m;
2175 _last_free = b;
2176 return &(b->_methods[i]);
2177 }
2178 }
2179 // Only check each block once for frees. They're very unlikely.
2180 // Increment top past the end of the block.
2181 b->_top++;
2182 }
2183 // need to allocate a next block.
2184 if (b->_next == nullptr) {
2185 b->_next = _last_free = new JNIMethodBlockNode();
2186 }
2187 }
2188 guarantee(false, "Should always allocate a free block");
2189 return nullptr;
2190 }
2191
2192 bool contains(Method** m) {
2193 if (m == nullptr) return false;
2194 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2195 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2196 // This is a bit of extra checking, for two reasons. One is
2197 // that contains() deals with pointers that are passed in by
2198 // JNI code, so making sure that the pointer is aligned
2199 // correctly is valuable. The other is that <= and > are
2200 // technically not defined on pointers, so the if guard can
2201 // pass spuriously; no modern compiler is likely to make that
2202 // a problem, though (and if one did, the guard could also
2203 // fail spuriously, which would be bad).
2204 ptrdiff_t idx = m - b->_methods;
2205 if (b->_methods + idx == m) {
2206 return true;
2207 }
2208 }
2209 }
2210 return false; // not found
2211 }
2212
2213 // During class unloading the methods are cleared, which is different
2214 // than freed.
2215 void clear_all_methods() {
2216 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2217 for (int i = 0; i< b->_number_of_methods; i++) {
2218 b->_methods[i] = nullptr;
2219 }
2220 }
2221 }
2222 #ifndef PRODUCT
2223 int count_methods() {
2224 // count all allocated methods
2225 int count = 0;
2226 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2227 for (int i = 0; i< b->_number_of_methods; i++) {
2228 if (b->_methods[i] != _free_method) count++;
2229 }
2230 }
2231 return count;
2232 }
2233 #endif // PRODUCT
2234 };
2235
2236 // Something that can't be mistaken for an address or a markWord
2237 Method* const JNIMethodBlock::_free_method = (Method*)55;
2238
2239 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2240 _number_of_methods = MAX2(num_methods, min_block_size);
2241 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2242 for (int i = 0; i < _number_of_methods; i++) {
2243 _methods[i] = JNIMethodBlock::_free_method;
2244 }
2245 }
2246
2247 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2248 // Have to add jmethod_ids() to class loader data thread-safely.
2249 // Also have to add the method to the list safely, which the lock
2250 // protects as well.
2251 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2252 if (cld->jmethod_ids() == nullptr) {
2253 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2254 } else {
2255 cld->jmethod_ids()->ensure_methods(capacity);
2256 }
2257 }
2258
2259 // Add a method id to the jmethod_ids
2260 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2261 // Have to add jmethod_ids() to class loader data thread-safely.
2262 // Also have to add the method to the list safely, which the lock
2263 // protects as well.
2264 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2265
2266 ResourceMark rm;
2267 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name());
2268 if (cld->jmethod_ids() == nullptr) {
2269 cld->set_jmethod_ids(new JNIMethodBlock());
2270 }
2271 // jmethodID is a pointer to Method*
2272 return (jmethodID)cld->jmethod_ids()->add_method(m);
2273 }
2274
2275 jmethodID Method::jmethod_id() {
2276 methodHandle mh(Thread::current(), this);
2277 return method_holder()->get_jmethod_id(mh);
2278 }
2279
2280 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2281 // Can't assert the method_holder is the same because the new method has the
2282 // scratch method holder.
2283 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2284 == new_method->method_holder()->class_loader() ||
2285 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2286 "changing to a different class loader");
2287 // Just change the method in place, jmethodID pointer doesn't change.
2288 *((Method**)jmid) = new_method;
2289 }
2290
2291 bool Method::is_method_id(jmethodID mid) {
2292 Method* m = resolve_jmethod_id(mid);
2293 assert(m != nullptr, "should be called with non-null method");
2294 InstanceKlass* ik = m->method_holder();
2295 ClassLoaderData* cld = ik->class_loader_data();
2296 if (cld->jmethod_ids() == nullptr) return false;
2297 return (cld->jmethod_ids()->contains((Method**)mid));
2298 }
2299
2300 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2301 if (mid == nullptr) return nullptr;
2302 Method* o = resolve_jmethod_id(mid);
2303 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2304 return nullptr;
2305 }
2306 // Method should otherwise be valid. Assert for testing.
2307 assert(is_valid_method(o), "should be valid jmethodid");
2308 // If the method's class holder object is unreferenced, but not yet marked as
2309 // unloaded, we need to return null here too because after a safepoint, its memory
2310 // will be reclaimed.
2311 return o->method_holder()->is_loader_alive() ? o : nullptr;
2312 };
2313
2314 void Method::set_on_stack(const bool value) {
2315 // Set both the method itself and its constant pool. The constant pool
2316 // on stack means some method referring to it is also on the stack.
2317 constants()->set_on_stack(value);
2318
2319 bool already_set = on_stack_flag();
2320 set_on_stack_flag(value);
2321 if (value && !already_set) {
2322 MetadataOnStackMark::record(this);
2323 }
2324 }
2325
2326 void Method::record_gc_epoch() {
2327 // If any method is on the stack in continuations, none of them can be reclaimed,
2328 // so save the marking cycle to check for the whole class in the cpCache.
2329 // The cpCache is writeable.
2330 constants()->cache()->record_gc_epoch();
2331 }
2332
2333 // Called when the class loader is unloaded to make all methods weak.
2334 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2335 loader_data->jmethod_ids()->clear_all_methods();
2336 }
2337
2338 void Method::clear_jmethod_id() {
2339 // Being at a safepoint prevents racing against other class redefinitions
2340 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2341 // The jmethodID is not stored in the Method instance, we need to look it up first
2342 jmethodID methodid = find_jmethod_id_or_null();
2343 // We need to make sure that jmethodID actually resolves to this method
2344 // - multiple redefined versions may share jmethodID slots and if a method
2345 // has already been rewired to a newer version we could be removing reference
2346 // to a still existing method instance
2347 if (methodid != nullptr && *((Method**)methodid) == this) {
2348 *((Method**)methodid) = nullptr;
2349 }
2350 }
2351
2352 bool Method::has_method_vptr(const void* ptr) {
2353 Method m;
2354 // This assumes that the vtbl pointer is the first word of a C++ object.
2355 return dereference_vptr(&m) == dereference_vptr(ptr);
2356 }
2357
2358 // Check that this pointer is valid by checking that the vtbl pointer matches
2359 bool Method::is_valid_method(const Method* m) {
2360 if (m == nullptr) {
2361 return false;
2362 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2363 // Quick sanity check on pointer.
2364 return false;
2365 } else if (!os::is_readable_range(m, m + 1)) {
2366 return false;
2367 } else if (m->is_shared()) {
2368 return CppVtables::is_valid_shared_method(m);
2369 } else if (Metaspace::contains_non_shared(m)) {
2370 return has_method_vptr((const void*)m);
2371 } else {
2372 return false;
2373 }
2374 }
2375
2376 #ifndef PRODUCT
2377 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2378 out->print("%d", loader_data->jmethod_ids()->count_methods());
2379 }
2380 #endif // PRODUCT
2381
2382
2383 // Printing
2384
2385 #ifndef PRODUCT
2386
2387 void Method::print_on(outputStream* st) const {
2388 ResourceMark rm;
2389 assert(is_method(), "must be method");
2390 st->print_cr("%s", internal_name());
2391 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2392 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2393 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2394 constants()->print_value_on(st); st->cr();
2395 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr();
2396 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2397 st->print (" - name: "); name()->print_value_on(st); st->cr();
2398 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2399 st->print_cr(" - max stack: %d", max_stack());
2400 st->print_cr(" - max locals: %d", max_locals());
2401 st->print_cr(" - size of params: %d", size_of_parameters());
2402 st->print_cr(" - method size: %d", method_size());
2403 if (intrinsic_id() != vmIntrinsics::_none)
2404 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2405 if (highest_comp_level() != CompLevel_none)
2406 st->print_cr(" - highest level: %d", highest_comp_level());
2407 st->print_cr(" - vtable index: %d", _vtable_index);
2408 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2409 st->print( " - adapters: ");
2410 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2411 if (a == nullptr)
2412 st->print_cr(PTR_FORMAT, p2i(a));
2413 else
2414 a->print_adapter_on(st);
2415 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2416 st->print_cr(" - code size: %d", code_size());
2417 if (code_size() != 0) {
2418 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2419 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2420 }
2421 if (method_data() != nullptr) {
2422 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2423 }
2424 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2425 if (checked_exceptions_length() > 0) {
2426 CheckedExceptionElement* table = checked_exceptions_start();
2427 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2428 if (Verbose) {
2429 for (int i = 0; i < checked_exceptions_length(); i++) {
2430 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2431 }
2432 }
2433 }
2434 if (has_linenumber_table()) {
2435 u_char* table = compressed_linenumber_table();
2436 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2437 if (Verbose) {
2438 CompressedLineNumberReadStream stream(table);
2439 while (stream.read_pair()) {
2440 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2441 }
2442 }
2443 }
2444 st->print_cr(" - localvar length: %d", localvariable_table_length());
2445 if (localvariable_table_length() > 0) {
2446 LocalVariableTableElement* table = localvariable_table_start();
2447 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2448 if (Verbose) {
2449 for (int i = 0; i < localvariable_table_length(); i++) {
2450 int bci = table[i].start_bci;
2451 int len = table[i].length;
2452 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2453 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2454 int slot = table[i].slot;
2455 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2456 }
2457 }
2458 }
2459 if (code() != nullptr) {
2460 st->print (" - compiled code: ");
2461 code()->print_value_on(st);
2462 }
2463 if (is_native()) {
2464 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2465 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2466 }
2467 }
2468
2469 void Method::print_linkage_flags(outputStream* st) {
2470 access_flags().print_on(st);
2471 if (is_default_method()) {
2472 st->print("default ");
2473 }
2474 if (is_overpass()) {
2475 st->print("overpass ");
2476 }
2477 }
2478 #endif //PRODUCT
2479
2480 void Method::print_value_on(outputStream* st) const {
2481 assert(is_method(), "must be method");
2482 st->print("%s", internal_name());
2483 print_address_on(st);
2484 st->print(" ");
2485 name()->print_value_on(st);
2486 st->print(" ");
2487 signature()->print_value_on(st);
2488 st->print(" in ");
2489 method_holder()->print_value_on(st);
2490 if (WizardMode) st->print("#%d", _vtable_index);
2491 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2492 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2493 }
2494
2495 // Verification
2496
2497 void Method::verify_on(outputStream* st) {
2498 guarantee(is_method(), "object must be method");
2499 guarantee(constants()->is_constantPool(), "should be constant pool");
2500 MethodData* md = method_data();
2501 guarantee(md == nullptr ||
2502 md->is_methodData(), "should be method data");
2503 }