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