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/codeCache.hpp"
35 #include "code/debugInfoRec.hpp"
36 #include "compiler/compilationPolicy.hpp"
37 #include "gc/shared/collectedHeap.inline.hpp"
38 #include "interpreter/bytecodeStream.hpp"
39 #include "interpreter/bytecodeTracer.hpp"
40 #include "interpreter/bytecodes.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/metaspaceClosure.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "nmt/memTracker.hpp"
53 #include "oops/constMethod.hpp"
54 #include "oops/constantPool.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/methodData.hpp"
58 #include "oops/objArrayKlass.hpp"
59 #include "oops/objArrayOop.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/symbol.hpp"
62 #include "oops/trainingData.hpp"
63 #include "prims/jvmtiExport.hpp"
64 #include "prims/methodHandles.hpp"
65 #include "runtime/atomic.hpp"
66 #include "runtime/arguments.hpp"
67 #include "runtime/continuationEntry.hpp"
68 #include "runtime/frame.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/init.hpp"
71 #include "runtime/java.hpp"
72 #include "runtime/orderAccess.hpp"
73 #include "runtime/perfData.hpp"
74 #include "runtime/relocator.hpp"
75 #include "runtime/safepointVerifiers.hpp"
76 #include "runtime/sharedRuntime.hpp"
77 #include "runtime/signature.hpp"
78 #include "runtime/threads.hpp"
79 #include "runtime/vm_version.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/quickSort.hpp"
82 #include "utilities/vmError.hpp"
83 #include "utilities/xmlstream.hpp"
84
85 // Implementation of Method
86
87 Method* Method::allocate(ClassLoaderData* loader_data,
88 int byte_code_size,
89 AccessFlags access_flags,
90 InlineTableSizes* sizes,
91 ConstMethod::MethodType method_type,
92 Symbol* name,
93 TRAPS) {
94 assert(!access_flags.is_native() || byte_code_size == 0,
95 "native methods should not contain byte codes");
96 ConstMethod* cm = ConstMethod::allocate(loader_data,
97 byte_code_size,
98 sizes,
99 method_type,
100 CHECK_NULL);
101 int size = Method::size(access_flags.is_native());
102 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
103 }
104
105 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
106 NoSafepointVerifier no_safepoint;
107 set_constMethod(xconst);
108 set_access_flags(access_flags);
109 set_intrinsic_id(vmIntrinsics::_none);
110 clear_method_data();
111 clear_method_counters();
112 set_vtable_index(Method::garbage_vtable_index);
113
114 // Fix and bury in Method*
115 set_interpreter_entry(nullptr); // sets i2i entry and from_int
116 set_adapter_entry(nullptr);
117 Method::clear_code(); // from_c/from_i get set to c2i/i2i
118
119 if (access_flags.is_native()) {
120 clear_native_function();
121 set_signature_handler(nullptr);
122 }
123
124 NOT_PRODUCT(set_compiled_invocation_count(0);)
125 // Name is very useful for debugging.
126 NOT_PRODUCT(_name = name;)
127 }
128
129 // Release Method*. The nmethod will be gone when we get here because
130 // we've walked the code cache.
131 void Method::deallocate_contents(ClassLoaderData* loader_data) {
132 MetadataFactory::free_metadata(loader_data, constMethod());
133 set_constMethod(nullptr);
134 MetadataFactory::free_metadata(loader_data, method_data());
135 clear_method_data();
136 MetadataFactory::free_metadata(loader_data, method_counters());
137 clear_method_counters();
138 // The nmethod will be gone when we get here.
139 if (code() != nullptr) _code = nullptr;
140 }
141
142 void Method::release_C_heap_structures() {
143 if (method_data()) {
144 method_data()->release_C_heap_structures();
145
146 // Destroy MethodData embedded lock
147 method_data()->~MethodData();
148 }
149 }
150
151 address Method::get_i2c_entry() {
152 assert(adapter() != nullptr, "must have");
153 return adapter()->get_i2c_entry();
154 }
155
156 address Method::get_c2i_entry() {
157 assert(adapter() != nullptr, "must have");
158 return adapter()->get_c2i_entry();
159 }
160
161 address Method::get_c2i_unverified_entry() {
162 assert(adapter() != nullptr, "must have");
163 return adapter()->get_c2i_unverified_entry();
164 }
165
166 address Method::get_c2i_no_clinit_check_entry() {
167 assert(VM_Version::supports_fast_class_init_checks(), "");
168 assert(adapter() != nullptr, "must have");
169 return adapter()->get_c2i_no_clinit_check_entry();
170 }
171
172 char* Method::name_and_sig_as_C_string() const {
173 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
174 }
175
176 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
177 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
178 }
179
180 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
181 const char* klass_name = klass->external_name();
182 int klass_name_len = (int)strlen(klass_name);
183 int method_name_len = method_name->utf8_length();
184 int len = klass_name_len + 2 + method_name_len + signature->utf8_length();
185 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
186 strcpy(dest, klass_name);
187 dest[klass_name_len + 0] = ':';
188 dest[klass_name_len + 1] = ':';
189 strcpy(&dest[klass_name_len + 2], method_name->as_C_string());
190 strcpy(&dest[klass_name_len + 2 + method_name_len], signature->as_C_string());
191 dest[len] = 0;
192 return dest;
193 }
194
195 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
196 Symbol* klass_name = klass->name();
197 klass_name->as_klass_external_name(buf, size);
198 int len = (int)strlen(buf);
199
200 if (len < size - 1) {
201 buf[len++] = '.';
202
203 method_name->as_C_string(&(buf[len]), size - len);
204 len = (int)strlen(buf);
205
206 signature->as_C_string(&(buf[len]), size - len);
207 }
208
209 return buf;
210 }
211
212 const char* Method::external_name() const {
213 return external_name(constants()->pool_holder(), name(), signature());
214 }
215
216 void Method::print_external_name(outputStream *os) const {
217 print_external_name(os, constants()->pool_holder(), name(), signature());
218 }
219
220 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
221 stringStream ss;
222 print_external_name(&ss, klass, method_name, signature);
223 return ss.as_string();
224 }
225
226 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
227 signature->print_as_signature_external_return_type(os);
228 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
229 signature->print_as_signature_external_parameters(os);
230 os->print(")");
231 }
232
233 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
234 if (log_is_enabled(Debug, exceptions)) {
235 ResourceMark rm(THREAD);
236 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
237 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
238 }
239 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
240 // access exception table
241 ExceptionTable table(mh());
242 int length = table.length();
243 // iterate through all entries sequentially
244 constantPoolHandle pool(THREAD, mh->constants());
245 for (int i = 0; i < length; i ++) {
246 //reacquire the table in case a GC happened
247 ExceptionTable table(mh());
248 int beg_bci = table.start_pc(i);
249 int end_bci = table.end_pc(i);
250 assert(beg_bci <= end_bci, "inconsistent exception table");
251 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
252 beg_bci, end_bci);
253
254 if (beg_bci <= throw_bci && throw_bci < end_bci) {
255 // exception handler bci range covers throw_bci => investigate further
256 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
257
258 int handler_bci = table.handler_pc(i);
259 int klass_index = table.catch_type_index(i);
260 if (klass_index == 0) {
261 if (log_is_enabled(Info, exceptions)) {
262 ResourceMark rm(THREAD);
263 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
264 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
265 }
266 return handler_bci;
267 } else if (ex_klass == nullptr) {
268 // Is this even possible?
269 if (log_is_enabled(Info, exceptions)) {
270 ResourceMark rm(THREAD);
271 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
272 mh()->name()->as_C_string(), handler_bci);
273 }
274 return handler_bci;
275 } else {
276 if (log_is_enabled(Debug, exceptions)) {
277 ResourceMark rm(THREAD);
278 log_debug(exceptions)(" - resolving catch type \"%s\"",
279 pool->klass_name_at(klass_index)->as_C_string());
280 }
281 // we know the exception class => get the constraint class
282 // this may require loading of the constraint class; if verification
283 // fails or some other exception occurs, return handler_bci
284 Klass* k = pool->klass_at(klass_index, THREAD);
285 if (HAS_PENDING_EXCEPTION) {
286 if (log_is_enabled(Debug, exceptions)) {
287 ResourceMark rm(THREAD);
288 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
289 PENDING_EXCEPTION->klass()->external_name());
290 }
291 return handler_bci;
292 }
293 assert(k != nullptr, "klass not loaded");
294 if (ex_klass->is_subtype_of(k)) {
295 if (log_is_enabled(Info, exceptions)) {
296 ResourceMark rm(THREAD);
297 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
298 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
299 }
300 return handler_bci;
301 }
302 }
303 }
304 }
305
306 if (log_is_enabled(Debug, exceptions)) {
307 ResourceMark rm(THREAD);
308 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
309 ex_klass->external_name(), mh->name()->as_C_string());
310 }
311
312 return -1;
313 }
314
315 void Method::mask_for(int bci, InterpreterOopMap* mask) {
316 methodHandle h_this(Thread::current(), this);
317 mask_for(h_this, bci, mask);
318 }
319
320 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
321 assert(this_mh() == this, "Sanity");
322 method_holder()->mask_for(this_mh, bci, mask);
323 }
324
325 int Method::bci_from(address bcp) const {
326 if (is_native() && bcp == nullptr) {
327 return 0;
328 }
329 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
330 // may call this after interrupting a nested ResourceMark.
331 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
332 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
333
334 return int(bcp - code_base());
335 }
336
337
338 int Method::validate_bci(int bci) const {
339 // Called from the verifier, and should return -1 if not valid.
340 return ((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size())) ? bci : -1;
341 }
342
343 // Return bci if it appears to be a valid bcp
344 // Return -1 otherwise.
345 // Used by profiling code, when invalid data is a possibility.
346 // The caller is responsible for validating the Method* itself.
347 int Method::validate_bci_from_bcp(address bcp) const {
348 // keep bci as -1 if not a valid bci
349 int bci = -1;
350 if (bcp == nullptr || bcp == code_base()) {
351 // code_size() may return 0 and we allow 0 here
352 // the method may be native
353 bci = 0;
354 } else if (contains(bcp)) {
355 bci = int(bcp - code_base());
356 }
357 // Assert that if we have dodged any asserts, bci is negative.
358 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
359 return bci;
360 }
361
362 address Method::bcp_from(int bci) const {
363 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
364 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
365 address bcp = code_base() + bci;
366 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
367 return bcp;
368 }
369
370 address Method::bcp_from(address bcp) const {
371 if (is_native() && bcp == nullptr) {
372 return code_base();
373 } else {
374 return bcp;
375 }
376 }
377
378 int Method::size(bool is_native) {
379 // If native, then include pointers for native_function and signature_handler
380 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
381 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
382 return align_metadata_size(header_size() + extra_words);
383 }
384
385 Symbol* Method::klass_name() const {
386 return method_holder()->name();
387 }
388
389 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
390 LogStreamHandle(Trace, cds) lsh;
391 if (lsh.is_enabled()) {
392 lsh.print("Iter(Method): %p ", this);
393 print_external_name(&lsh);
394 lsh.cr();
395 }
396 if (method_holder() != nullptr && !method_holder()->is_rewritten()) {
397 // holder is null for MH intrinsic methods
398 it->push(&_constMethod, MetaspaceClosure::_writable);
399 } else {
400 it->push(&_constMethod);
401 }
402 if (CDSConfig::is_dumping_adapters()) {
403 it->push(&_adapter);
404 }
405 it->push(&_method_data);
406 it->push(&_method_counters);
407 NOT_PRODUCT(it->push(&_name);)
408 }
409
410 #if INCLUDE_CDS
411 // Attempt to return method to original state. Clear any pointers
412 // (to objects outside the shared spaces). We won't be able to predict
413 // where they should point in a new JVM. Further initialize some
414 // entries now in order allow them to be write protected later.
415
416 void Method::remove_unshareable_info() {
417 unlink_method();
418 if (CDSConfig::is_dumping_adapters()) {
419 if (_adapter != nullptr) {
420 _adapter->remove_unshareable_info();
421 }
422 } else {
423 _adapter = nullptr;
424 }
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 JFR_ONLY(REMOVE_METHOD_ID(this);)
432 }
433
434 void Method::restore_adapter(TRAPS) {
435 if (_adapter != nullptr) {
436 _adapter->restore_unshareable_info(CHECK);
437 _from_compiled_entry = _adapter->get_c2i_entry();
438 }
439 }
440
441 void Method::restore_unshareable_info(TRAPS) {
442 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
443 restore_adapter(CHECK);
444 if (method_data() != nullptr) {
445 method_data()->restore_unshareable_info(CHECK);
446 }
447 if (method_counters() != nullptr) {
448 method_counters()->restore_unshareable_info(CHECK);
449 }
450 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
451 assert(!pending_queue_processed(), "method's pending_queued_processed flag should not be set");
452 }
453 #endif
454
455 void Method::set_vtable_index(int index) {
456 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
457 // At runtime initialize_vtable is rerun as part of link_class_impl()
458 // for a shared class loaded by the non-boot loader to obtain the loader
459 // constraints based on the runtime classloaders' context.
460 return; // don't write into the shared class
461 } else {
462 _vtable_index = index;
463 }
464 }
465
466 void Method::set_itable_index(int index) {
467 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
468 // At runtime initialize_itable is rerun as part of link_class_impl()
469 // for a shared class loaded by the non-boot loader to obtain the loader
470 // constraints based on the runtime classloaders' context. The dumptime
471 // itable index should be the same as the runtime index.
472 assert(_vtable_index == itable_index_max - index,
473 "archived itable index is different from runtime index");
474 return; // don't write into the shared class
475 } else {
476 _vtable_index = itable_index_max - index;
477 }
478 assert(valid_itable_index(), "");
479 }
480
481 // The RegisterNatives call being attempted tried to register with a method that
482 // is not native. Ask JVM TI what prefixes have been specified. Then check
483 // to see if the native method is now wrapped with the prefixes. See the
484 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
485 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
486 #if INCLUDE_JVMTI
487 ResourceMark rm(THREAD);
488 Method* method;
489 int name_len = name->utf8_length();
490 char* name_str = name->as_utf8();
491 int prefix_count;
492 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
493 for (int i = 0; i < prefix_count; i++) {
494 char* prefix = prefixes[i];
495 int prefix_len = (int)strlen(prefix);
496
497 // try adding this prefix to the method name and see if it matches another method name
498 int trial_len = name_len + prefix_len;
499 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
500 strcpy(trial_name_str, prefix);
501 strcat(trial_name_str, name_str);
502 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
503 if (trial_name == nullptr) {
504 continue; // no such symbol, so this prefix wasn't used, try the next prefix
505 }
506 method = k->lookup_method(trial_name, signature);
507 if (method == nullptr) {
508 continue; // signature doesn't match, try the next prefix
509 }
510 if (method->is_native()) {
511 method->set_is_prefixed_native();
512 return method; // wahoo, we found a prefixed version of the method, return it
513 }
514 // found as non-native, so prefix is good, add it, probably just need more prefixes
515 name_len = trial_len;
516 name_str = trial_name_str;
517 }
518 #endif // INCLUDE_JVMTI
519 return nullptr; // not found
520 }
521
522 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
523 Method* method = k->lookup_method(name, signature);
524 if (method == nullptr) {
525 ResourceMark rm(THREAD);
526 stringStream st;
527 st.print("Method '");
528 print_external_name(&st, k, name, signature);
529 st.print("' name or signature does not match");
530 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
531 }
532 if (!method->is_native()) {
533 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
534 method = find_prefixed_native(k, name, signature, THREAD);
535 if (method == nullptr) {
536 ResourceMark rm(THREAD);
537 stringStream st;
538 st.print("Method '");
539 print_external_name(&st, k, name, signature);
540 st.print("' is not declared as native");
541 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
542 }
543 }
544
545 if (entry != nullptr) {
546 method->set_native_function(entry, native_bind_event_is_interesting);
547 } else {
548 method->clear_native_function();
549 }
550 if (log_is_enabled(Debug, jni, resolve)) {
551 ResourceMark rm(THREAD);
552 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
553 method->method_holder()->external_name(),
554 method->name()->as_C_string());
555 }
556 return true;
557 }
558
559 bool Method::was_executed_more_than(int n) {
560 // Invocation counter is reset when the Method* is compiled.
561 // If the method has compiled code we therefore assume it has
562 // be executed more than n times.
563 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
564 // interpreter doesn't bump invocation counter of trivial methods
565 // compiler does not bump invocation counter of compiled methods
566 return true;
567 }
568 else if ((method_counters() != nullptr &&
569 method_counters()->invocation_counter()->carry()) ||
570 (method_data() != nullptr &&
571 method_data()->invocation_counter()->carry())) {
572 // The carry bit is set when the counter overflows and causes
573 // a compilation to occur. We don't know how many times
574 // the counter has been reset, so we simply assume it has
575 // been executed more than n times.
576 return true;
577 } else {
578 return invocation_count() > n;
579 }
580 }
581
582 void Method::print_invocation_count(outputStream* st) {
583 //---< compose+print method return type, klass, name, and signature >---
584 if (is_static()) { st->print("static "); }
585 if (is_final()) { st->print("final "); }
586 if (is_synchronized()) { st->print("synchronized "); }
587 if (is_native()) { st->print("native "); }
588 st->print("%s::", method_holder()->external_name());
589 name()->print_symbol_on(st);
590 signature()->print_symbol_on(st);
591
592 if (WizardMode) {
593 // dump the size of the byte codes
594 st->print(" {%d}", code_size());
595 }
596 st->cr();
597
598 // Counting based on signed int counters tends to overflow with
599 // longer-running workloads on fast machines. The counters under
600 // consideration here, however, are limited in range by counting
601 // logic. See InvocationCounter:count_limit for example.
602 // No "overflow precautions" need to be implemented here.
603 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
604 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
605 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
606
607 if (method_data() != nullptr) {
608 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
609 }
610
611 #ifndef PRODUCT
612 if (CountCompiledCalls) {
613 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
614 }
615 #endif
616 }
617
618 MethodTrainingData* Method::training_data_or_null() const {
619 MethodCounters* mcs = method_counters();
620 if (mcs == nullptr) {
621 return nullptr;
622 } else {
623 MethodTrainingData* mtd = mcs->method_training_data();
624 if (mtd == mcs->method_training_data_sentinel()) {
625 return nullptr;
626 }
627 return mtd;
628 }
629 }
630
631 bool Method::init_training_data(MethodTrainingData* td) {
632 MethodCounters* mcs = method_counters();
633 if (mcs == nullptr) {
634 return false;
635 } else {
636 return mcs->init_method_training_data(td);
637 }
638 }
639
640 bool Method::install_training_method_data(const methodHandle& method) {
641 MethodTrainingData* mtd = MethodTrainingData::find(method);
642 if (mtd != nullptr && mtd->final_profile() != nullptr) {
643 Atomic::replace_if_null(&method->_method_data, mtd->final_profile());
644 return true;
645 }
646 return false;
647 }
648
649 // Build a MethodData* object to hold profiling information collected on this
650 // method when requested.
651 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
652 if (install_training_method_data(method)) {
653 return;
654 }
655 // Do not profile the method if metaspace has hit an OOM previously
656 // allocating profiling data. Callers clear pending exception so don't
657 // add one here.
658 if (ClassLoaderDataGraph::has_metaspace_oom()) {
659 return;
660 }
661
662 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
663 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
664 if (HAS_PENDING_EXCEPTION) {
665 CompileBroker::log_metaspace_failure();
666 ClassLoaderDataGraph::set_metaspace_oom(true);
667 return; // return the exception (which is cleared)
668 }
669
670 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
671 MetadataFactory::free_metadata(loader_data, method_data);
672 return;
673 }
674
675 if (ForceProfiling && TrainingData::need_data()) {
676 MethodTrainingData* mtd = MethodTrainingData::make(method, false);
677 guarantee(mtd != nullptr, "");
678 }
679
680 if (PrintMethodData) {
681 ResourceMark rm(THREAD);
682 tty->print("build_profiling_method_data for ");
683 method->print_name(tty);
684 tty->cr();
685 // At the end of the run, the MDO, full of data, will be dumped.
686 }
687 }
688
689 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
690 // Do not profile the method if metaspace has hit an OOM previously
691 if (ClassLoaderDataGraph::has_metaspace_oom()) {
692 return nullptr;
693 }
694
695 methodHandle mh(current, m);
696 MethodCounters* counters;
697 if (current->is_Java_thread()) {
698 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
699 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
700 // if needed.
701 counters = MethodCounters::allocate_with_exception(mh, THREAD);
702 if (HAS_PENDING_EXCEPTION) {
703 CLEAR_PENDING_EXCEPTION;
704 }
705 } else {
706 // Call metaspace allocation that doesn't throw exception if the
707 // current thread isn't a JavaThread, ie. the VMThread.
708 counters = MethodCounters::allocate_no_exception(mh);
709 }
710
711 if (counters == nullptr) {
712 CompileBroker::log_metaspace_failure();
713 ClassLoaderDataGraph::set_metaspace_oom(true);
714 return nullptr;
715 }
716
717 if (!mh->init_method_counters(counters)) {
718 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
719 }
720
721 if (ForceProfiling && TrainingData::need_data()) {
722 MethodTrainingData* mtd = MethodTrainingData::make(mh, false);
723 guarantee(mtd != nullptr, "");
724 }
725
726 return mh->method_counters();
727 }
728
729 bool Method::init_method_counters(MethodCounters* counters) {
730 // Try to install a pointer to MethodCounters, return true on success.
731 return Atomic::replace_if_null(&_method_counters, counters);
732 }
733
734 void Method::set_exception_handler_entered(int handler_bci) {
735 if (ProfileExceptionHandlers) {
736 MethodData* mdo = method_data();
737 if (mdo != nullptr) {
738 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
739 handler_data.set_exception_handler_entered();
740 }
741 }
742 }
743
744 int Method::extra_stack_words() {
745 // not an inline function, to avoid a header dependency on Interpreter
746 return extra_stack_entries() * Interpreter::stackElementSize;
747 }
748
749 bool Method::compute_has_loops_flag() {
750 BytecodeStream bcs(methodHandle(Thread::current(), this));
751 Bytecodes::Code bc;
752
753 while ((bc = bcs.next()) >= 0) {
754 switch (bc) {
755 case Bytecodes::_ifeq:
756 case Bytecodes::_ifnull:
757 case Bytecodes::_iflt:
758 case Bytecodes::_ifle:
759 case Bytecodes::_ifne:
760 case Bytecodes::_ifnonnull:
761 case Bytecodes::_ifgt:
762 case Bytecodes::_ifge:
763 case Bytecodes::_if_icmpeq:
764 case Bytecodes::_if_icmpne:
765 case Bytecodes::_if_icmplt:
766 case Bytecodes::_if_icmpgt:
767 case Bytecodes::_if_icmple:
768 case Bytecodes::_if_icmpge:
769 case Bytecodes::_if_acmpeq:
770 case Bytecodes::_if_acmpne:
771 case Bytecodes::_goto:
772 case Bytecodes::_jsr:
773 if (bcs.dest() < bcs.next_bci()) {
774 return set_has_loops();
775 }
776 break;
777
778 case Bytecodes::_goto_w:
779 case Bytecodes::_jsr_w:
780 if (bcs.dest_w() < bcs.next_bci()) {
781 return set_has_loops();
782 }
783 break;
784
785 case Bytecodes::_lookupswitch: {
786 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
787 if (lookupswitch.default_offset() < 0) {
788 return set_has_loops();
789 } else {
790 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
791 LookupswitchPair pair = lookupswitch.pair_at(i);
792 if (pair.offset() < 0) {
793 return set_has_loops();
794 }
795 }
796 }
797 break;
798 }
799 case Bytecodes::_tableswitch: {
800 Bytecode_tableswitch tableswitch(this, bcs.bcp());
801 if (tableswitch.default_offset() < 0) {
802 return set_has_loops();
803 } else {
804 for (int i = 0; i < tableswitch.length(); ++i) {
805 if (tableswitch.dest_offset_at(i) < 0) {
806 return set_has_loops();
807 }
808 }
809 }
810 break;
811 }
812 default:
813 break;
814 }
815 }
816
817 _flags.set_has_loops_flag_init(true);
818 return false;
819 }
820
821 bool Method::is_final_method(AccessFlags class_access_flags) const {
822 // or "does_not_require_vtable_entry"
823 // default method or overpass can occur, is not final (reuses vtable entry)
824 // private methods in classes get vtable entries for backward class compatibility.
825 if (is_overpass() || is_default_method()) return false;
826 return is_final() || class_access_flags.is_final();
827 }
828
829 bool Method::is_final_method() const {
830 return is_final_method(method_holder()->access_flags());
831 }
832
833 bool Method::is_default_method() const {
834 if (method_holder() != nullptr &&
835 method_holder()->is_interface() &&
836 !is_abstract() && !is_private()) {
837 return true;
838 } else {
839 return false;
840 }
841 }
842
843 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
844 if (is_final_method(class_access_flags)) return true;
845 #ifdef ASSERT
846 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
847 if (class_access_flags.is_interface()) {
848 ResourceMark rm;
849 assert(is_nonv == is_static() || is_nonv == is_private(),
850 "nonvirtual unexpected for non-static, non-private: %s",
851 name_and_sig_as_C_string());
852 }
853 #endif
854 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
855 return vtable_index() == nonvirtual_vtable_index;
856 }
857
858 bool Method::can_be_statically_bound() const {
859 return can_be_statically_bound(method_holder()->access_flags());
860 }
861
862 bool Method::can_be_statically_bound(InstanceKlass* context) const {
863 return (method_holder() == context) && can_be_statically_bound();
864 }
865
866 /**
867 * Returns false if this is one of specially treated methods for
868 * which we have to provide stack trace in throw in compiled code.
869 * Returns true otherwise.
870 */
871 bool Method::can_omit_stack_trace() {
872 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
873 return false; // All methods in sun.invoke.util.ValueConversions
874 }
875 return true;
876 }
877
878 bool Method::is_accessor() const {
879 return is_getter() || is_setter();
880 }
881
882 bool Method::is_getter() const {
883 if (code_size() != 5) return false;
884 if (size_of_parameters() != 1) return false;
885 if (java_code_at(0) != Bytecodes::_aload_0) return false;
886 if (java_code_at(1) != Bytecodes::_getfield) return false;
887 switch (java_code_at(4)) {
888 case Bytecodes::_ireturn:
889 case Bytecodes::_lreturn:
890 case Bytecodes::_freturn:
891 case Bytecodes::_dreturn:
892 case Bytecodes::_areturn:
893 break;
894 default:
895 return false;
896 }
897 return true;
898 }
899
900 bool Method::is_setter() const {
901 if (code_size() != 6) return false;
902 if (java_code_at(0) != Bytecodes::_aload_0) return false;
903 switch (java_code_at(1)) {
904 case Bytecodes::_iload_1:
905 case Bytecodes::_aload_1:
906 case Bytecodes::_fload_1:
907 if (size_of_parameters() != 2) return false;
908 break;
909 case Bytecodes::_dload_1:
910 case Bytecodes::_lload_1:
911 if (size_of_parameters() != 3) return false;
912 break;
913 default:
914 return false;
915 }
916 if (java_code_at(2) != Bytecodes::_putfield) return false;
917 if (java_code_at(5) != Bytecodes::_return) return false;
918 return true;
919 }
920
921 bool Method::is_constant_getter() const {
922 int last_index = code_size() - 1;
923 // Check if the first 1-3 bytecodes are a constant push
924 // and the last bytecode is a return.
925 return (2 <= code_size() && code_size() <= 4 &&
926 Bytecodes::is_const(java_code_at(0)) &&
927 Bytecodes::length_for(java_code_at(0)) == last_index &&
928 Bytecodes::is_return(java_code_at(last_index)));
929 }
930
931 bool Method::has_valid_initializer_flags() const {
932 return (is_static() ||
933 method_holder()->major_version() < 51);
934 }
935
936 bool Method::is_static_initializer() const {
937 // For classfiles version 51 or greater, ensure that the clinit method is
938 // static. Non-static methods with the name "<clinit>" are not static
939 // initializers. (older classfiles exempted for backward compatibility)
940 return name() == vmSymbols::class_initializer_name() &&
941 has_valid_initializer_flags();
942 }
943
944 bool Method::is_object_initializer() const {
945 return name() == vmSymbols::object_initializer_name();
946 }
947
948 bool Method::needs_clinit_barrier() const {
949 return is_static() && !method_holder()->is_initialized();
950 }
951
952 bool Method::code_has_clinit_barriers() const {
953 nmethod* nm = code();
954 return (nm != nullptr) && nm->has_clinit_barriers();
955 }
956
957 bool Method::is_object_wait0() const {
958 return klass_name() == vmSymbols::java_lang_Object()
959 && name() == vmSymbols::wait_name();
960 }
961
962 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
963 int length = method->checked_exceptions_length();
964 if (length == 0) { // common case
965 return objArrayHandle(THREAD, Universe::the_empty_class_array());
966 } else {
967 methodHandle h_this(THREAD, method);
968 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
969 objArrayHandle mirrors (THREAD, m_oop);
970 for (int i = 0; i < length; i++) {
971 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
972 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
973 if (log_is_enabled(Warning, exceptions) &&
974 !k->is_subclass_of(vmClasses::Throwable_klass())) {
975 ResourceMark rm(THREAD);
976 log_warning(exceptions)(
977 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
978 k->external_name(), method->external_name());
979 }
980 mirrors->obj_at_put(i, k->java_mirror());
981 }
982 return mirrors;
983 }
984 };
985
986
987 int Method::line_number_from_bci(int bci) const {
988 int best_bci = 0;
989 int best_line = -1;
990 if (bci == SynchronizationEntryBCI) bci = 0;
991 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
992 // The line numbers are a short array of 2-tuples [start_pc, line_number].
993 // Not necessarily sorted and not necessarily one-to-one.
994 CompressedLineNumberReadStream stream(compressed_linenumber_table());
995 while (stream.read_pair()) {
996 if (stream.bci() == bci) {
997 // perfect match
998 return stream.line();
999 } else {
1000 // update best_bci/line
1001 if (stream.bci() < bci && stream.bci() >= best_bci) {
1002 best_bci = stream.bci();
1003 best_line = stream.line();
1004 }
1005 }
1006 }
1007 }
1008 return best_line;
1009 }
1010
1011
1012 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1013 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
1014 Thread *thread = Thread::current();
1015 Symbol* klass_name = constants()->klass_name_at(klass_index);
1016 Handle loader(thread, method_holder()->class_loader());
1017 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr;
1018 } else {
1019 return true;
1020 }
1021 }
1022
1023
1024 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1025 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1026 if (must_be_resolved) {
1027 // Make sure klass is resolved in constantpool.
1028 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
1029 }
1030 return is_klass_loaded_by_klass_index(klass_index);
1031 }
1032
1033
1034 void Method::set_native_function(address function, bool post_event_flag) {
1035 assert(function != nullptr, "use clear_native_function to unregister natives");
1036 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1037 address* native_function = native_function_addr();
1038
1039 // We can see racers trying to place the same native function into place. Once
1040 // is plenty.
1041 address current = *native_function;
1042 if (current == function) return;
1043 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1044 function != nullptr) {
1045 // native_method_throw_unsatisfied_link_error_entry() should only
1046 // be passed when post_event_flag is false.
1047 assert(function !=
1048 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1049 "post_event_flag mismatch");
1050
1051 // post the bind event, and possible change the bind function
1052 JvmtiExport::post_native_method_bind(this, &function);
1053 }
1054 *native_function = function;
1055 // This function can be called more than once. We must make sure that we always
1056 // use the latest registered method -> check if a stub already has been generated.
1057 // If so, we have to make it not_entrant.
1058 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1059 if (nm != nullptr) {
1060 nm->make_not_entrant("set native function");
1061 }
1062 }
1063
1064
1065 bool Method::has_native_function() const {
1066 if (is_special_native_intrinsic())
1067 return false; // special-cased in SharedRuntime::generate_native_wrapper
1068 address func = native_function();
1069 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1070 }
1071
1072
1073 void Method::clear_native_function() {
1074 // Note: is_method_handle_intrinsic() is allowed here.
1075 set_native_function(
1076 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1077 !native_bind_event_is_interesting);
1078 this->unlink_code();
1079 }
1080
1081
1082 void Method::set_signature_handler(address handler) {
1083 address* signature_handler = signature_handler_addr();
1084 *signature_handler = handler;
1085 }
1086
1087
1088 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1089 assert(reason != nullptr, "must provide a reason");
1090 if (PrintCompilation && report) {
1091 ttyLocker ttyl;
1092 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1093 if (comp_level == CompLevel_all) {
1094 tty->print("all levels ");
1095 } else {
1096 tty->print("level %d ", comp_level);
1097 }
1098 this->print_short_name(tty);
1099 int size = this->code_size();
1100 if (size > 0) {
1101 tty->print(" (%d bytes)", size);
1102 }
1103 if (reason != nullptr) {
1104 tty->print(" %s", reason);
1105 }
1106 tty->cr();
1107 }
1108 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1109 ttyLocker ttyl;
1110 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'",
1111 os::current_thread_id(), is_osr, comp_level);
1112 if (reason != nullptr) {
1113 xtty->print(" reason=\'%s\'", reason);
1114 }
1115 xtty->method(this);
1116 xtty->stamp();
1117 xtty->end_elem();
1118 }
1119 }
1120
1121 bool Method::is_always_compilable() const {
1122 // Generated adapters must be compiled
1123 if (is_special_native_intrinsic() && is_synthetic()) {
1124 assert(!is_not_c1_compilable(), "sanity check");
1125 assert(!is_not_c2_compilable(), "sanity check");
1126 return true;
1127 }
1128
1129 return false;
1130 }
1131
1132 bool Method::is_not_compilable(int comp_level) const {
1133 if (number_of_breakpoints() > 0)
1134 return true;
1135 if (is_always_compilable())
1136 return false;
1137 if (comp_level == CompLevel_any)
1138 return is_not_c1_compilable() && is_not_c2_compilable();
1139 if (is_c1_compile(comp_level))
1140 return is_not_c1_compilable();
1141 if (is_c2_compile(comp_level))
1142 return is_not_c2_compilable();
1143 return false;
1144 }
1145
1146 // call this when compiler finds that this method is not compilable
1147 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1148 if (is_always_compilable()) {
1149 // Don't mark a method which should be always compilable
1150 return;
1151 }
1152 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1153 if (comp_level == CompLevel_all) {
1154 set_is_not_c1_compilable();
1155 set_is_not_c2_compilable();
1156 } else {
1157 if (is_c1_compile(comp_level))
1158 set_is_not_c1_compilable();
1159 if (is_c2_compile(comp_level))
1160 set_is_not_c2_compilable();
1161 }
1162 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1163 }
1164
1165 bool Method::is_not_osr_compilable(int comp_level) const {
1166 if (is_not_compilable(comp_level))
1167 return true;
1168 if (comp_level == CompLevel_any)
1169 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1170 if (is_c1_compile(comp_level))
1171 return is_not_c1_osr_compilable();
1172 if (is_c2_compile(comp_level))
1173 return is_not_c2_osr_compilable();
1174 return false;
1175 }
1176
1177 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1178 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1179 if (comp_level == CompLevel_all) {
1180 set_is_not_c1_osr_compilable();
1181 set_is_not_c2_osr_compilable();
1182 } else {
1183 if (is_c1_compile(comp_level))
1184 set_is_not_c1_osr_compilable();
1185 if (is_c2_compile(comp_level))
1186 set_is_not_c2_osr_compilable();
1187 }
1188 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1189 }
1190
1191 // Revert to using the interpreter and clear out the nmethod
1192 void Method::clear_code() {
1193 // this may be null if c2i adapters have not been made yet
1194 // Only should happen at allocate time.
1195 if (adapter() == nullptr) {
1196 _from_compiled_entry = nullptr;
1197 } else {
1198 _from_compiled_entry = adapter()->get_c2i_entry();
1199 }
1200 OrderAccess::storestore();
1201 _from_interpreted_entry = _i2i_entry;
1202 OrderAccess::storestore();
1203 _code = nullptr;
1204 }
1205
1206 void Method::unlink_code(nmethod *compare) {
1207 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1208 // We need to check if either the _code or _from_compiled_code_entry_point
1209 // refer to this nmethod because there is a race in setting these two fields
1210 // in Method* as seen in bugid 4947125.
1211 if (code() == compare ||
1212 from_compiled_entry() == compare->verified_entry_point()) {
1213 clear_code();
1214 }
1215 }
1216
1217 void Method::unlink_code() {
1218 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1219 clear_code();
1220 }
1221
1222 #if INCLUDE_CDS
1223 // Called by class data sharing to remove any entry points (which are not shared)
1224 void Method::unlink_method() {
1225 assert(CDSConfig::is_dumping_archive(), "sanity");
1226 _code = nullptr;
1227 if (!CDSConfig::is_dumping_adapters() || AdapterHandlerLibrary::is_abstract_method_adapter(_adapter)) {
1228 _adapter = nullptr;
1229 }
1230 _i2i_entry = nullptr;
1231 _from_compiled_entry = nullptr;
1232 _from_interpreted_entry = nullptr;
1233
1234 if (is_native()) {
1235 *native_function_addr() = nullptr;
1236 set_signature_handler(nullptr);
1237 }
1238 NOT_PRODUCT(set_compiled_invocation_count(0);)
1239
1240 clear_method_data();
1241 clear_method_counters();
1242 clear_is_not_c1_compilable();
1243 clear_is_not_c1_osr_compilable();
1244 clear_is_not_c2_compilable();
1245 clear_is_not_c2_osr_compilable();
1246 clear_queued_for_compilation();
1247 set_pending_queue_processed(false);
1248 remove_unshareable_flags();
1249 }
1250
1251 void Method::remove_unshareable_flags() {
1252 // clear all the flags that shouldn't be in the archived version
1253 assert(!is_old(), "must be");
1254 assert(!is_obsolete(), "must be");
1255 assert(!is_deleted(), "must be");
1256
1257 set_is_prefixed_native(false);
1258 set_queued_for_compilation(false);
1259 set_pending_queue_processed(false);
1260 set_is_not_c2_compilable(false);
1261 set_is_not_c1_compilable(false);
1262 set_is_not_c2_osr_compilable(false);
1263 set_on_stack_flag(false);
1264 set_has_upcall_on_method_entry(false);
1265 set_has_upcall_on_method_exit(false);
1266 }
1267 #endif
1268
1269 // Called when the method_holder is getting linked. Setup entrypoints so the method
1270 // is ready to be called from interpreter, compiler, and vtables.
1271 void Method::link_method(const methodHandle& h_method, TRAPS) {
1272 if (log_is_enabled(Info, perf, class, link)) {
1273 ClassLoader::perf_ik_link_methods_count()->inc();
1274 }
1275
1276 // If the code cache is full, we may reenter this function for the
1277 // leftover methods that weren't linked.
1278 if (adapter() != nullptr && !adapter()->is_shared()) {
1279 return;
1280 }
1281 assert( _code == nullptr, "nothing compiled yet" );
1282
1283 // Setup interpreter entrypoint
1284 assert(this == h_method(), "wrong h_method()" );
1285
1286 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache");
1287 address entry = Interpreter::entry_for_method(h_method);
1288 assert(entry != nullptr, "interpreter entry must be non-null");
1289 // Sets both _i2i_entry and _from_interpreted_entry
1290 set_interpreter_entry(entry);
1291
1292 // Don't overwrite already registered native entries.
1293 if (is_native() && !has_native_function()) {
1294 set_native_function(
1295 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1296 !native_bind_event_is_interesting);
1297 }
1298
1299 // Setup compiler entrypoint. This is made eagerly, so we do not need
1300 // special handling of vtables. An alternative is to make adapters more
1301 // lazily by calling make_adapter() from from_compiled_entry() for the
1302 // normal calls. For vtable calls life gets more complicated. When a
1303 // call-site goes mega-morphic we need adapters in all methods which can be
1304 // called from the vtable. We need adapters on such methods that get loaded
1305 // later. Ditto for mega-morphic itable calls. If this proves to be a
1306 // problem we'll make these lazily later.
1307 if (_adapter == nullptr) {
1308 (void) make_adapters(h_method, CHECK);
1309 }
1310
1311 // ONLY USE the h_method now as make_adapter may have blocked
1312
1313 if (h_method->is_continuation_native_intrinsic()) {
1314 _from_interpreted_entry = nullptr;
1315 _from_compiled_entry = nullptr;
1316 _i2i_entry = nullptr;
1317 if (Continuations::enabled()) {
1318 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1319 AdapterHandlerLibrary::create_native_wrapper(h_method);
1320 if (!h_method->has_compiled_code()) {
1321 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1322 }
1323 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1324 }
1325 }
1326 if (_preload_code != nullptr) {
1327 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1328 set_code(h_method, _preload_code);
1329 assert(((nmethod*)_preload_code)->scc_entry() == _scc_entry, "sanity");
1330 }
1331 }
1332
1333 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1334 PerfTraceElapsedTime timer(ClassLoader::perf_method_adapters_time());
1335
1336 // Adapters for compiled code are made eagerly here. They are fairly
1337 // small (generally < 100 bytes) and quick to make (and cached and shared)
1338 // so making them eagerly shouldn't be too expensive.
1339 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1340 if (adapter == nullptr ) {
1341 if (!is_init_completed()) {
1342 // Don't throw exceptions during VM initialization because java.lang.* classes
1343 // might not have been initialized, causing problems when constructing the
1344 // Java exception object.
1345 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1346 } else {
1347 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1348 }
1349 }
1350
1351 mh->set_adapter_entry(adapter);
1352 mh->_from_compiled_entry = adapter->get_c2i_entry();
1353 return adapter->get_c2i_entry();
1354 }
1355
1356 // The verified_code_entry() must be called when a invoke is resolved
1357 // on this method.
1358
1359 // It returns the compiled code entry point, after asserting not null.
1360 // This function is called after potential safepoints so that nmethod
1361 // or adapter that it points to is still live and valid.
1362 // This function must not hit a safepoint!
1363 address Method::verified_code_entry() {
1364 debug_only(NoSafepointVerifier nsv;)
1365 assert(_from_compiled_entry != nullptr, "must be set");
1366 return _from_compiled_entry;
1367 }
1368
1369 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1370 // (could be racing a deopt).
1371 // Not inline to avoid circular ref.
1372 bool Method::check_code() const {
1373 // cached in a register or local. There's a race on the value of the field.
1374 nmethod *code = Atomic::load_acquire(&_code);
1375 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1376 }
1377
1378 // Install compiled code. Instantly it can execute.
1379 void Method::set_code(const methodHandle& mh, nmethod *code) {
1380 assert_lock_strong(NMethodState_lock);
1381 assert( code, "use clear_code to remove code" );
1382 assert( mh->check_code(), "" );
1383
1384 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1385
1386 // These writes must happen in this order, because the interpreter will
1387 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1388 // which jumps to _from_compiled_entry.
1389 mh->_code = code; // Assign before allowing compiled code to exec
1390
1391 int comp_level = code->comp_level();
1392 // In theory there could be a race here. In practice it is unlikely
1393 // and not worth worrying about.
1394 if (comp_level > mh->highest_comp_level()) {
1395 mh->set_highest_comp_level(comp_level);
1396 }
1397
1398 OrderAccess::storestore();
1399 mh->_from_compiled_entry = code->verified_entry_point();
1400 OrderAccess::storestore();
1401
1402 if (mh->is_continuation_native_intrinsic()) {
1403 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1404
1405 if (mh->is_continuation_enter_intrinsic()) {
1406 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1407 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1408 } else if (mh->is_continuation_yield_intrinsic()) {
1409 mh->_i2i_entry = mh->get_i2c_entry();
1410 } else {
1411 guarantee(false, "Unknown Continuation native intrinsic");
1412 }
1413 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1414 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1415 } else if (!mh->is_method_handle_intrinsic()) {
1416 // Instantly compiled code can execute.
1417 mh->_from_interpreted_entry = mh->get_i2c_entry();
1418 }
1419 }
1420
1421
1422 bool Method::is_overridden_in(Klass* k) const {
1423 InstanceKlass* ik = InstanceKlass::cast(k);
1424
1425 if (ik->is_interface()) return false;
1426
1427 // If method is an interface, we skip it - except if it
1428 // is a miranda method
1429 if (method_holder()->is_interface()) {
1430 // Check that method is not a miranda method
1431 if (ik->lookup_method(name(), signature()) == nullptr) {
1432 // No implementation exist - so miranda method
1433 return false;
1434 }
1435 return true;
1436 }
1437
1438 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1439 if (!has_vtable_index()) {
1440 return false;
1441 } else {
1442 Method* vt_m = ik->method_at_vtable(vtable_index());
1443 return vt_m != this;
1444 }
1445 }
1446
1447
1448 // give advice about whether this Method* should be cached or not
1449 bool Method::should_not_be_cached() const {
1450 if (is_old()) {
1451 // This method has been redefined. It is either EMCP or obsolete
1452 // and we don't want to cache it because that would pin the method
1453 // down and prevent it from being collectible if and when it
1454 // finishes executing.
1455 return true;
1456 }
1457
1458 // caching this method should be just fine
1459 return false;
1460 }
1461
1462
1463 /**
1464 * Returns true if this is one of the specially treated methods for
1465 * security related stack walks (like Reflection.getCallerClass).
1466 */
1467 bool Method::is_ignored_by_security_stack_walk() const {
1468 if (intrinsic_id() == vmIntrinsics::_invoke) {
1469 // This is Method.invoke() -- ignore it
1470 return true;
1471 }
1472 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1473 // This is an auxiliary frame -- ignore it
1474 return true;
1475 }
1476 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1477 // This is an internal adapter frame for method handles -- ignore it
1478 return true;
1479 }
1480 return false;
1481 }
1482
1483
1484 // Constant pool structure for invoke methods:
1485 enum {
1486 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1487 _imcp_invoke_signature, // utf8: (variable Symbol*)
1488 _imcp_limit
1489 };
1490
1491 // Test if this method is an MH adapter frame generated by Java code.
1492 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1493 bool Method::is_compiled_lambda_form() const {
1494 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1495 }
1496
1497 // Test if this method is an internal MH primitive method.
1498 bool Method::is_method_handle_intrinsic() const {
1499 vmIntrinsics::ID iid = intrinsic_id();
1500 return (MethodHandles::is_signature_polymorphic(iid) &&
1501 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1502 }
1503
1504 bool Method::has_member_arg() const {
1505 vmIntrinsics::ID iid = intrinsic_id();
1506 return (MethodHandles::is_signature_polymorphic(iid) &&
1507 MethodHandles::has_member_arg(iid));
1508 }
1509
1510 // Make an instance of a signature-polymorphic internal MH primitive.
1511 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1512 Symbol* signature,
1513 TRAPS) {
1514 ResourceMark rm(THREAD);
1515 methodHandle empty;
1516
1517 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1518 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1519 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1520
1521 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1522
1523 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1524 name->increment_refcount();
1525 signature->increment_refcount();
1526
1527 int cp_length = _imcp_limit;
1528 ClassLoaderData* loader_data = holder->class_loader_data();
1529 constantPoolHandle cp;
1530 {
1531 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1532 cp = constantPoolHandle(THREAD, cp_oop);
1533 }
1534 cp->copy_fields(holder->constants());
1535 cp->set_pool_holder(holder);
1536 cp->symbol_at_put(_imcp_invoke_name, name);
1537 cp->symbol_at_put(_imcp_invoke_signature, signature);
1538 cp->set_has_preresolution();
1539 cp->set_is_for_method_handle_intrinsic();
1540
1541 // decide on access bits: public or not?
1542 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1543 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1544 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1545 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1546
1547 methodHandle m;
1548 {
1549 InlineTableSizes sizes;
1550 Method* m_oop = Method::allocate(loader_data, 0,
1551 accessFlags_from(flags_bits), &sizes,
1552 ConstMethod::NORMAL,
1553 name,
1554 CHECK_(empty));
1555 m = methodHandle(THREAD, m_oop);
1556 }
1557 m->set_constants(cp());
1558 m->set_name_index(_imcp_invoke_name);
1559 m->set_signature_index(_imcp_invoke_signature);
1560 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1561 assert(m->signature() == signature, "");
1562 m->constMethod()->compute_from_signature(signature, must_be_static);
1563 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1564 assert(m->is_method_handle_intrinsic(), "");
1565 #ifdef ASSERT
1566 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1567 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1568 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1569 #endif //ASSERT
1570
1571 // Finally, set up its entry points.
1572 assert(m->can_be_statically_bound(), "");
1573 m->set_vtable_index(Method::nonvirtual_vtable_index);
1574 m->link_method(m, CHECK_(empty));
1575
1576 if (iid == vmIntrinsics::_linkToNative) {
1577 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1578 }
1579 if (log_is_enabled(Debug, methodhandles)) {
1580 LogTarget(Debug, methodhandles) lt;
1581 LogStream ls(lt);
1582 m->print_on(&ls);
1583 }
1584
1585 return m;
1586 }
1587
1588 #if INCLUDE_CDS
1589 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1590 m->restore_adapter(CHECK);
1591 if (m->adapter() != nullptr) {
1592 m->adapter()->restore_unshareable_info(CHECK);
1593 m->set_from_compiled_entry(m->adapter()->get_c2i_entry());
1594 }
1595 m->link_method(m, CHECK);
1596
1597 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1598 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1599 }
1600 }
1601 #endif
1602
1603 Klass* Method::check_non_bcp_klass(Klass* klass) {
1604 if (klass != nullptr && klass->class_loader() != nullptr) {
1605 if (klass->is_objArray_klass())
1606 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1607 return klass;
1608 }
1609 return nullptr;
1610 }
1611
1612
1613 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1614 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1615 // Code below does not work for native methods - they should never get rewritten anyway
1616 assert(!m->is_native(), "cannot rewrite native methods");
1617 // Allocate new Method*
1618 AccessFlags flags = m->access_flags();
1619
1620 ConstMethod* cm = m->constMethod();
1621 int checked_exceptions_len = cm->checked_exceptions_length();
1622 int localvariable_len = cm->localvariable_table_length();
1623 int exception_table_len = cm->exception_table_length();
1624 int method_parameters_len = cm->method_parameters_length();
1625 int method_annotations_len = cm->method_annotations_length();
1626 int parameter_annotations_len = cm->parameter_annotations_length();
1627 int type_annotations_len = cm->type_annotations_length();
1628 int default_annotations_len = cm->default_annotations_length();
1629
1630 InlineTableSizes sizes(
1631 localvariable_len,
1632 new_compressed_linenumber_size,
1633 exception_table_len,
1634 checked_exceptions_len,
1635 method_parameters_len,
1636 cm->generic_signature_index(),
1637 method_annotations_len,
1638 parameter_annotations_len,
1639 type_annotations_len,
1640 default_annotations_len,
1641 0);
1642
1643 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1644 Method* newm_oop = Method::allocate(loader_data,
1645 new_code_length,
1646 flags,
1647 &sizes,
1648 m->method_type(),
1649 m->name(),
1650 CHECK_(methodHandle()));
1651 methodHandle newm (THREAD, newm_oop);
1652
1653 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1654 ConstMethod* newcm = newm->constMethod();
1655 int new_const_method_size = newm->constMethod()->size();
1656
1657 // This works because the source and target are both Methods. Some compilers
1658 // (e.g., clang) complain that the target vtable pointer will be stomped,
1659 // so cast away newm()'s and m()'s Methodness.
1660 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1661
1662 // Create shallow copy of ConstMethod.
1663 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1664
1665 // Reset correct method/const method, method size, and parameter info
1666 newm->set_constMethod(newcm);
1667 newm->constMethod()->set_code_size(new_code_length);
1668 newm->constMethod()->set_constMethod_size(new_const_method_size);
1669 assert(newm->code_size() == new_code_length, "check");
1670 assert(newm->method_parameters_length() == method_parameters_len, "check");
1671 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1672 assert(newm->exception_table_length() == exception_table_len, "check");
1673 assert(newm->localvariable_table_length() == localvariable_len, "check");
1674 // Copy new byte codes
1675 memcpy(newm->code_base(), new_code, new_code_length);
1676 // Copy line number table
1677 if (new_compressed_linenumber_size > 0) {
1678 memcpy(newm->compressed_linenumber_table(),
1679 new_compressed_linenumber_table,
1680 new_compressed_linenumber_size);
1681 }
1682 // Copy method_parameters
1683 if (method_parameters_len > 0) {
1684 memcpy(newm->method_parameters_start(),
1685 m->method_parameters_start(),
1686 method_parameters_len * sizeof(MethodParametersElement));
1687 }
1688 // Copy checked_exceptions
1689 if (checked_exceptions_len > 0) {
1690 memcpy(newm->checked_exceptions_start(),
1691 m->checked_exceptions_start(),
1692 checked_exceptions_len * sizeof(CheckedExceptionElement));
1693 }
1694 // Copy exception table
1695 if (exception_table_len > 0) {
1696 memcpy(newm->exception_table_start(),
1697 m->exception_table_start(),
1698 exception_table_len * sizeof(ExceptionTableElement));
1699 }
1700 // Copy local variable number table
1701 if (localvariable_len > 0) {
1702 memcpy(newm->localvariable_table_start(),
1703 m->localvariable_table_start(),
1704 localvariable_len * sizeof(LocalVariableTableElement));
1705 }
1706 // Copy stackmap table
1707 if (m->has_stackmap_table()) {
1708 int code_attribute_length = m->stackmap_data()->length();
1709 Array<u1>* stackmap_data =
1710 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1711 memcpy((void*)stackmap_data->adr_at(0),
1712 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1713 newm->set_stackmap_data(stackmap_data);
1714 }
1715
1716 // copy annotations over to new method
1717 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1718 return newm;
1719 }
1720
1721 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1722 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1723 // because we are not loading from core libraries
1724 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1725 // which does not use the class default class loader so we check for its loader here
1726 const InstanceKlass* ik = InstanceKlass::cast(holder);
1727 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1728 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1729 }
1730
1731 // see if the klass name is well-known:
1732 Symbol* klass_name = ik->name();
1733 vmSymbolID id = vmSymbols::find_sid(klass_name);
1734 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1735 return id;
1736 } else {
1737 return vmSymbolID::NO_SID;
1738 }
1739 }
1740
1741 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1742 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1743 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1744 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1745 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1746
1747 // the klass name is well-known:
1748 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1749 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1750
1751 // ditto for method and signature:
1752 vmSymbolID name_id = vmSymbols::find_sid(name());
1753 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1754 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1755 && name_id == vmSymbolID::NO_SID) {
1756 return;
1757 }
1758 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1759 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1760 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1761 && sig_id == vmSymbolID::NO_SID) {
1762 return;
1763 }
1764
1765 u2 flags = access_flags().as_method_flags();
1766 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1767 if (id != vmIntrinsics::_none) {
1768 set_intrinsic_id(id);
1769 if (id == vmIntrinsics::_Class_cast) {
1770 // Even if the intrinsic is rejected, we want to inline this simple method.
1771 set_force_inline();
1772 }
1773 return;
1774 }
1775
1776 // A few slightly irregular cases:
1777 switch (klass_id) {
1778 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1779 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1780 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1781 if (!is_native()) break;
1782 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1783 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1784 id = vmIntrinsics::_none;
1785 break;
1786
1787 default:
1788 break;
1789 }
1790
1791 if (id != vmIntrinsics::_none) {
1792 // Set up its iid. It is an alias method.
1793 set_intrinsic_id(id);
1794 return;
1795 }
1796 }
1797
1798 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1799 if (!THREAD->can_call_java()) {
1800 // There is nothing useful this routine can do from within the Compile thread.
1801 // Hopefully, the signature contains only well-known classes.
1802 // We could scan for this and return true/false, but the caller won't care.
1803 return false;
1804 }
1805 bool sig_is_loaded = true;
1806 ResourceMark rm(THREAD);
1807 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1808 if (ss.is_reference()) {
1809 // load everything, including arrays "[Lfoo;"
1810 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1811 // We are loading classes eagerly. If a ClassNotFoundException or
1812 // a LinkageError was generated, be sure to ignore it.
1813 if (HAS_PENDING_EXCEPTION) {
1814 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1815 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1816 CLEAR_PENDING_EXCEPTION;
1817 } else {
1818 return false;
1819 }
1820 }
1821 if( klass == nullptr) { sig_is_loaded = false; }
1822 }
1823 }
1824 return sig_is_loaded;
1825 }
1826
1827 // Exposed so field engineers can debug VM
1828 void Method::print_short_name(outputStream* st) const {
1829 ResourceMark rm;
1830 #ifdef PRODUCT
1831 st->print(" %s::", method_holder()->external_name());
1832 #else
1833 st->print(" %s::", method_holder()->internal_name());
1834 #endif
1835 name()->print_symbol_on(st);
1836 if (WizardMode) signature()->print_symbol_on(st);
1837 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1838 MethodHandles::print_as_basic_type_signature_on(st, signature());
1839 }
1840
1841 // Comparer for sorting an object array containing
1842 // Method*s.
1843 static int method_comparator(Method* a, Method* b) {
1844 return a->name()->fast_compare(b->name());
1845 }
1846
1847 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1848 // default_methods also uses this without the ordering for fast find_method
1849 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1850 int length = methods->length();
1851 if (length > 1) {
1852 if (func == nullptr) {
1853 func = method_comparator;
1854 }
1855 {
1856 NoSafepointVerifier nsv;
1857 QuickSort::sort(methods->data(), length, func);
1858 }
1859 // Reset method ordering
1860 if (set_idnums) {
1861 for (u2 i = 0; i < length; i++) {
1862 Method* m = methods->at(i);
1863 m->set_method_idnum(i);
1864 m->set_orig_method_idnum(i);
1865 }
1866 }
1867 }
1868 }
1869
1870 //-----------------------------------------------------------------------------------
1871 // Non-product code unless JVM/TI needs it
1872
1873 #if !defined(PRODUCT) || INCLUDE_JVMTI
1874 class SignatureTypePrinter : public SignatureTypeNames {
1875 private:
1876 outputStream* _st;
1877 bool _use_separator;
1878
1879 void type_name(const char* name) {
1880 if (_use_separator) _st->print(", ");
1881 _st->print("%s", name);
1882 _use_separator = true;
1883 }
1884
1885 public:
1886 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1887 _st = st;
1888 _use_separator = false;
1889 }
1890
1891 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1892 void print_returntype() { _use_separator = false; do_type(return_type()); }
1893 };
1894
1895
1896 void Method::print_name(outputStream* st) const {
1897 Thread *thread = Thread::current();
1898 ResourceMark rm(thread);
1899 st->print("%s ", is_static() ? "static" : "virtual");
1900 if (WizardMode) {
1901 st->print("%s.", method_holder()->internal_name());
1902 name()->print_symbol_on(st);
1903 signature()->print_symbol_on(st);
1904 } else {
1905 SignatureTypePrinter sig(signature(), st);
1906 sig.print_returntype();
1907 st->print(" %s.", method_holder()->internal_name());
1908 name()->print_symbol_on(st);
1909 st->print("(");
1910 sig.print_parameters();
1911 st->print(")");
1912 }
1913 }
1914 #endif // !PRODUCT || INCLUDE_JVMTI
1915
1916
1917 void Method::print_codes_on(outputStream* st, int flags) const {
1918 print_codes_on(0, code_size(), st, flags);
1919 }
1920
1921 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1922 Thread *thread = Thread::current();
1923 ResourceMark rm(thread);
1924 methodHandle mh (thread, (Method*)this);
1925 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1926 }
1927
1928 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1929 _bci = 0;
1930 _line = 0;
1931 };
1932
1933 bool CompressedLineNumberReadStream::read_pair() {
1934 jubyte next = read_byte();
1935 // Check for terminator
1936 if (next == 0) return false;
1937 if (next == 0xFF) {
1938 // Escape character, regular compression used
1939 _bci += read_signed_int();
1940 _line += read_signed_int();
1941 } else {
1942 // Single byte compression used
1943 _bci += next >> 3;
1944 _line += next & 0x7;
1945 }
1946 return true;
1947 }
1948
1949 #if INCLUDE_JVMTI
1950
1951 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1952 BreakpointInfo* bp = method_holder()->breakpoints();
1953 for (; bp != nullptr; bp = bp->next()) {
1954 if (bp->match(this, bci)) {
1955 return bp->orig_bytecode();
1956 }
1957 }
1958 {
1959 ResourceMark rm;
1960 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1961 }
1962 return Bytecodes::_shouldnotreachhere;
1963 }
1964
1965 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1966 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1967 BreakpointInfo* bp = method_holder()->breakpoints();
1968 for (; bp != nullptr; bp = bp->next()) {
1969 if (bp->match(this, bci)) {
1970 bp->set_orig_bytecode(code);
1971 // and continue, in case there is more than one
1972 }
1973 }
1974 }
1975
1976 void Method::set_breakpoint(int bci) {
1977 InstanceKlass* ik = method_holder();
1978 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1979 bp->set_next(ik->breakpoints());
1980 ik->set_breakpoints(bp);
1981 // do this last:
1982 bp->set(this);
1983 }
1984
1985 static void clear_matches(Method* m, int bci) {
1986 InstanceKlass* ik = m->method_holder();
1987 BreakpointInfo* prev_bp = nullptr;
1988 BreakpointInfo* next_bp;
1989 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1990 next_bp = bp->next();
1991 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1992 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1993 // do this first:
1994 bp->clear(m);
1995 // unhook it
1996 if (prev_bp != nullptr)
1997 prev_bp->set_next(next_bp);
1998 else
1999 ik->set_breakpoints(next_bp);
2000 delete bp;
2001 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
2002 // at same location. So we have multiple matching (method_index and bci)
2003 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
2004 // breakpoint for clear_breakpoint request and keep all other method versions
2005 // BreakpointInfo for future clear_breakpoint request.
2006 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
2007 // which is being called when class is unloaded. We delete all the Breakpoint
2008 // information for all versions of method. We may not correctly restore the original
2009 // bytecode in all method versions, but that is ok. Because the class is being unloaded
2010 // so these methods won't be used anymore.
2011 if (bci >= 0) {
2012 break;
2013 }
2014 } else {
2015 // This one is a keeper.
2016 prev_bp = bp;
2017 }
2018 }
2019 }
2020
2021 void Method::clear_breakpoint(int bci) {
2022 assert(bci >= 0, "");
2023 clear_matches(this, bci);
2024 }
2025
2026 void Method::clear_all_breakpoints() {
2027 clear_matches(this, -1);
2028 }
2029
2030 #endif // INCLUDE_JVMTI
2031
2032 int Method::highest_osr_comp_level() const {
2033 const MethodCounters* mcs = method_counters();
2034 if (mcs != nullptr) {
2035 return mcs->highest_osr_comp_level();
2036 } else {
2037 return CompLevel_none;
2038 }
2039 }
2040
2041 void Method::set_highest_comp_level(int level) {
2042 MethodCounters* mcs = method_counters();
2043 if (mcs != nullptr) {
2044 mcs->set_highest_comp_level(level);
2045 }
2046 }
2047
2048 void Method::set_highest_osr_comp_level(int level) {
2049 MethodCounters* mcs = method_counters();
2050 if (mcs != nullptr) {
2051 mcs->set_highest_osr_comp_level(level);
2052 }
2053 }
2054
2055 #if INCLUDE_JVMTI
2056
2057 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2058 _bci = bci;
2059 _name_index = m->name_index();
2060 _signature_index = m->signature_index();
2061 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2062 if (_orig_bytecode == Bytecodes::_breakpoint)
2063 _orig_bytecode = m->orig_bytecode_at(_bci);
2064 _next = nullptr;
2065 }
2066
2067 void BreakpointInfo::set(Method* method) {
2068 #ifdef ASSERT
2069 {
2070 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2071 if (code == Bytecodes::_breakpoint)
2072 code = method->orig_bytecode_at(_bci);
2073 assert(orig_bytecode() == code, "original bytecode must be the same");
2074 }
2075 #endif
2076 Thread *thread = Thread::current();
2077 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2078 method->incr_number_of_breakpoints(thread);
2079 {
2080 // Deoptimize all dependents on this method
2081 HandleMark hm(thread);
2082 methodHandle mh(thread, method);
2083 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2084 }
2085 }
2086
2087 void BreakpointInfo::clear(Method* method) {
2088 *method->bcp_from(_bci) = orig_bytecode();
2089 assert(method->number_of_breakpoints() > 0, "must not go negative");
2090 method->decr_number_of_breakpoints(Thread::current());
2091 }
2092
2093 #endif // INCLUDE_JVMTI
2094
2095 // jmethodID handling
2096
2097 // This is a block allocating object, sort of like JNIHandleBlock, only a
2098 // lot simpler.
2099 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2100 // never get rid of it.
2101
2102 static const int min_block_size = 8;
2103
2104 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2105 friend class JNIMethodBlock;
2106 Method** _methods;
2107 int _number_of_methods;
2108 int _top;
2109 JNIMethodBlockNode* _next;
2110
2111 public:
2112
2113 JNIMethodBlockNode(int num_methods = min_block_size);
2114
2115 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2116
2117 void ensure_methods(int num_addl_methods) {
2118 if (_top < _number_of_methods) {
2119 num_addl_methods -= _number_of_methods - _top;
2120 if (num_addl_methods <= 0) {
2121 return;
2122 }
2123 }
2124 if (_next == nullptr) {
2125 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2126 } else {
2127 _next->ensure_methods(num_addl_methods);
2128 }
2129 }
2130 };
2131
2132 class JNIMethodBlock : public CHeapObj<mtClass> {
2133 JNIMethodBlockNode _head;
2134 JNIMethodBlockNode *_last_free;
2135 public:
2136 static Method* const _free_method;
2137
2138 JNIMethodBlock(int initial_capacity = min_block_size)
2139 : _head(initial_capacity), _last_free(&_head) {}
2140
2141 void ensure_methods(int num_addl_methods) {
2142 _last_free->ensure_methods(num_addl_methods);
2143 }
2144
2145 Method** add_method(Method* m) {
2146 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2147 if (b->_top < b->_number_of_methods) {
2148 // top points to the next free entry.
2149 int i = b->_top;
2150 b->_methods[i] = m;
2151 b->_top++;
2152 _last_free = b;
2153 return &(b->_methods[i]);
2154 } else if (b->_top == b->_number_of_methods) {
2155 // if the next free entry ran off the block see if there's a free entry
2156 for (int i = 0; i < b->_number_of_methods; i++) {
2157 if (b->_methods[i] == _free_method) {
2158 b->_methods[i] = m;
2159 _last_free = b;
2160 return &(b->_methods[i]);
2161 }
2162 }
2163 // Only check each block once for frees. They're very unlikely.
2164 // Increment top past the end of the block.
2165 b->_top++;
2166 }
2167 // need to allocate a next block.
2168 if (b->_next == nullptr) {
2169 b->_next = _last_free = new JNIMethodBlockNode();
2170 }
2171 }
2172 guarantee(false, "Should always allocate a free block");
2173 return nullptr;
2174 }
2175
2176 bool contains(Method** m) {
2177 if (m == nullptr) return false;
2178 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2179 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2180 // This is a bit of extra checking, for two reasons. One is
2181 // that contains() deals with pointers that are passed in by
2182 // JNI code, so making sure that the pointer is aligned
2183 // correctly is valuable. The other is that <= and > are
2184 // technically not defined on pointers, so the if guard can
2185 // pass spuriously; no modern compiler is likely to make that
2186 // a problem, though (and if one did, the guard could also
2187 // fail spuriously, which would be bad).
2188 ptrdiff_t idx = m - b->_methods;
2189 if (b->_methods + idx == m) {
2190 return true;
2191 }
2192 }
2193 }
2194 return false; // not found
2195 }
2196
2197 // During class unloading the methods are cleared, which is different
2198 // than freed.
2199 void clear_all_methods() {
2200 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2201 for (int i = 0; i< b->_number_of_methods; i++) {
2202 b->_methods[i] = nullptr;
2203 }
2204 }
2205 }
2206 #ifndef PRODUCT
2207 int count_methods() {
2208 // count all allocated methods
2209 int count = 0;
2210 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2211 for (int i = 0; i< b->_number_of_methods; i++) {
2212 if (b->_methods[i] != _free_method) count++;
2213 }
2214 }
2215 return count;
2216 }
2217 #endif // PRODUCT
2218 };
2219
2220 // Something that can't be mistaken for an address or a markWord
2221 Method* const JNIMethodBlock::_free_method = (Method*)55;
2222
2223 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2224 _number_of_methods = MAX2(num_methods, min_block_size);
2225 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2226 for (int i = 0; i < _number_of_methods; i++) {
2227 _methods[i] = JNIMethodBlock::_free_method;
2228 }
2229 }
2230
2231 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2232 // Have to add jmethod_ids() to class loader data thread-safely.
2233 // Also have to add the method to the list safely, which the lock
2234 // protects as well.
2235 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2236 if (cld->jmethod_ids() == nullptr) {
2237 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2238 } else {
2239 cld->jmethod_ids()->ensure_methods(capacity);
2240 }
2241 }
2242
2243 // Add a method id to the jmethod_ids
2244 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2245 // Have to add jmethod_ids() to class loader data thread-safely.
2246 // Also have to add the method to the list safely, which the lock
2247 // protects as well.
2248 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2249
2250 ResourceMark rm;
2251 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name());
2252 if (cld->jmethod_ids() == nullptr) {
2253 cld->set_jmethod_ids(new JNIMethodBlock());
2254 }
2255 // jmethodID is a pointer to Method*
2256 return (jmethodID)cld->jmethod_ids()->add_method(m);
2257 }
2258
2259 jmethodID Method::jmethod_id() {
2260 methodHandle mh(Thread::current(), this);
2261 return method_holder()->get_jmethod_id(mh);
2262 }
2263
2264 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2265 // Can't assert the method_holder is the same because the new method has the
2266 // scratch method holder.
2267 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2268 == new_method->method_holder()->class_loader() ||
2269 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2270 "changing to a different class loader");
2271 // Just change the method in place, jmethodID pointer doesn't change.
2272 *((Method**)jmid) = new_method;
2273 }
2274
2275 bool Method::is_method_id(jmethodID mid) {
2276 Method* m = resolve_jmethod_id(mid);
2277 assert(m != nullptr, "should be called with non-null method");
2278 InstanceKlass* ik = m->method_holder();
2279 ClassLoaderData* cld = ik->class_loader_data();
2280 if (cld->jmethod_ids() == nullptr) return false;
2281 return (cld->jmethod_ids()->contains((Method**)mid));
2282 }
2283
2284 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2285 if (mid == nullptr) return nullptr;
2286 Method* o = resolve_jmethod_id(mid);
2287 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2288 return nullptr;
2289 }
2290 // Method should otherwise be valid. Assert for testing.
2291 assert(is_valid_method(o), "should be valid jmethodid");
2292 // If the method's class holder object is unreferenced, but not yet marked as
2293 // unloaded, we need to return null here too because after a safepoint, its memory
2294 // will be reclaimed.
2295 return o->method_holder()->is_loader_alive() ? o : nullptr;
2296 };
2297
2298 void Method::set_on_stack(const bool value) {
2299 // Set both the method itself and its constant pool. The constant pool
2300 // on stack means some method referring to it is also on the stack.
2301 constants()->set_on_stack(value);
2302
2303 bool already_set = on_stack_flag();
2304 set_on_stack_flag(value);
2305 if (value && !already_set) {
2306 MetadataOnStackMark::record(this);
2307 }
2308 }
2309
2310 void Method::record_gc_epoch() {
2311 // If any method is on the stack in continuations, none of them can be reclaimed,
2312 // so save the marking cycle to check for the whole class in the cpCache.
2313 // The cpCache is writeable.
2314 constants()->cache()->record_gc_epoch();
2315 }
2316
2317 // Called when the class loader is unloaded to make all methods weak.
2318 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2319 loader_data->jmethod_ids()->clear_all_methods();
2320 }
2321
2322 void Method::clear_jmethod_id() {
2323 // Being at a safepoint prevents racing against other class redefinitions
2324 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2325 // The jmethodID is not stored in the Method instance, we need to look it up first
2326 jmethodID methodid = find_jmethod_id_or_null();
2327 // We need to make sure that jmethodID actually resolves to this method
2328 // - multiple redefined versions may share jmethodID slots and if a method
2329 // has already been rewired to a newer version we could be removing reference
2330 // to a still existing method instance
2331 if (methodid != nullptr && *((Method**)methodid) == this) {
2332 *((Method**)methodid) = nullptr;
2333 }
2334 }
2335
2336 bool Method::has_method_vptr(const void* ptr) {
2337 Method m;
2338 // This assumes that the vtbl pointer is the first word of a C++ object.
2339 return dereference_vptr(&m) == dereference_vptr(ptr);
2340 }
2341
2342 // Check that this pointer is valid by checking that the vtbl pointer matches
2343 bool Method::is_valid_method(const Method* m) {
2344 if (m == nullptr) {
2345 return false;
2346 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2347 // Quick sanity check on pointer.
2348 return false;
2349 } else if (!os::is_readable_range(m, m + 1)) {
2350 return false;
2351 } else if (m->is_shared()) {
2352 return CppVtables::is_valid_shared_method(m);
2353 } else if (Metaspace::contains_non_shared(m)) {
2354 return has_method_vptr((const void*)m);
2355 } else {
2356 return false;
2357 }
2358 }
2359
2360 #ifndef PRODUCT
2361 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2362 out->print("%d", loader_data->jmethod_ids()->count_methods());
2363 }
2364 #endif // PRODUCT
2365
2366
2367 // Printing
2368
2369 #ifndef PRODUCT
2370
2371 void Method::print_on(outputStream* st) const {
2372 ResourceMark rm;
2373 assert(is_method(), "must be method");
2374 st->print_cr("%s", internal_name());
2375 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2376 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2377 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2378 constants()->print_value_on(st); st->cr();
2379 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr();
2380 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2381 st->print (" - name: "); name()->print_value_on(st); st->cr();
2382 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2383 st->print_cr(" - max stack: %d", max_stack());
2384 st->print_cr(" - max locals: %d", max_locals());
2385 st->print_cr(" - size of params: %d", size_of_parameters());
2386 st->print_cr(" - method size: %d", method_size());
2387 if (intrinsic_id() != vmIntrinsics::_none)
2388 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2389 if (highest_comp_level() != CompLevel_none)
2390 st->print_cr(" - highest level: %d", highest_comp_level());
2391 st->print_cr(" - vtable index: %d", _vtable_index);
2392 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2393 st->print( " - adapters: ");
2394 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2395 if (a == nullptr)
2396 st->print_cr(PTR_FORMAT, p2i(a));
2397 else
2398 a->print_adapter_on(st);
2399 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2400 st->print_cr(" - code size: %d", code_size());
2401 if (code_size() != 0) {
2402 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2403 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2404 }
2405 if (method_data() != nullptr) {
2406 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2407 }
2408 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2409 if (checked_exceptions_length() > 0) {
2410 CheckedExceptionElement* table = checked_exceptions_start();
2411 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2412 if (Verbose) {
2413 for (int i = 0; i < checked_exceptions_length(); i++) {
2414 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2415 }
2416 }
2417 }
2418 if (has_linenumber_table()) {
2419 u_char* table = compressed_linenumber_table();
2420 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2421 if (Verbose) {
2422 CompressedLineNumberReadStream stream(table);
2423 while (stream.read_pair()) {
2424 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2425 }
2426 }
2427 }
2428 st->print_cr(" - localvar length: %d", localvariable_table_length());
2429 if (localvariable_table_length() > 0) {
2430 LocalVariableTableElement* table = localvariable_table_start();
2431 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2432 if (Verbose) {
2433 for (int i = 0; i < localvariable_table_length(); i++) {
2434 int bci = table[i].start_bci;
2435 int len = table[i].length;
2436 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2437 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2438 int slot = table[i].slot;
2439 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2440 }
2441 }
2442 }
2443 if (code() != nullptr) {
2444 st->print (" - compiled code: ");
2445 code()->print_value_on(st);
2446 }
2447 if (is_native()) {
2448 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2449 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2450 }
2451 }
2452
2453 void Method::print_linkage_flags(outputStream* st) {
2454 access_flags().print_on(st);
2455 if (is_default_method()) {
2456 st->print("default ");
2457 }
2458 if (is_overpass()) {
2459 st->print("overpass ");
2460 }
2461 }
2462 #endif //PRODUCT
2463
2464 void Method::print_value_on(outputStream* st) const {
2465 assert(is_method(), "must be method");
2466 st->print("%s", internal_name());
2467 print_address_on(st);
2468 st->print(" ");
2469 name()->print_value_on(st);
2470 st->print(" ");
2471 signature()->print_value_on(st);
2472 st->print(" in ");
2473 method_holder()->print_value_on(st);
2474 if (WizardMode) st->print("#%d", _vtable_index);
2475 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2476 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2477 }
2478
2479 // Verification
2480
2481 void Method::verify_on(outputStream* st) {
2482 guarantee(is_method(), "object must be method");
2483 guarantee(constants()->is_constantPool(), "should be constant pool");
2484 MethodData* md = method_data();
2485 guarantee(md == nullptr ||
2486 md->is_methodData(), "should be method data");
2487 }