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* tdata) {
626 MethodCounters* mcs = method_counters();
627 if (mcs == nullptr) {
628 return false;
629 } else {
630 return mcs->init_method_training_data(tdata);
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 /*
671 LogStreamHandle(Info, mdo) lsh;
672 if (lsh.is_enabled()) {
673 ResourceMark rm(THREAD);
674 lsh.print("build_profiling_method_data for ");
675 method->print_name(&lsh);
676 lsh.cr();
677 }
678 */
679 if (ForceProfiling && TrainingData::need_data()) {
680 MethodTrainingData* mtd = MethodTrainingData::make(method, false);
681 guarantee(mtd != nullptr, "");
682 }
683 if (PrintMethodData) {
684 ResourceMark rm(THREAD);
685 tty->print("build_profiling_method_data for ");
686 method->print_name(tty);
687 tty->cr();
688 // At the end of the run, the MDO, full of data, will be dumped.
689 }
690 }
691
692 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
693 // Do not profile the method if metaspace has hit an OOM previously
694 if (ClassLoaderDataGraph::has_metaspace_oom()) {
695 return nullptr;
696 }
697
698 methodHandle mh(current, m);
699 MethodCounters* counters;
700 if (current->is_Java_thread()) {
701 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
702 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
703 // if needed.
704 counters = MethodCounters::allocate_with_exception(mh, THREAD);
705 if (HAS_PENDING_EXCEPTION) {
706 CLEAR_PENDING_EXCEPTION;
707 }
708 } else {
709 // Call metaspace allocation that doesn't throw exception if the
710 // current thread isn't a JavaThread, ie. the VMThread.
711 counters = MethodCounters::allocate_no_exception(mh);
712 }
713
714 if (counters == nullptr) {
715 CompileBroker::log_metaspace_failure();
716 ClassLoaderDataGraph::set_metaspace_oom(true);
717 return nullptr;
718 }
719
720 if (!mh->init_method_counters(counters)) {
721 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
722 }
723
724 if (ForceProfiling && TrainingData::need_data()) {
725 MethodTrainingData* mtd = MethodTrainingData::make(mh, false);
726 guarantee(mtd != nullptr, "");
727 }
728
729 return mh->method_counters();
730 }
731
732 bool Method::init_method_counters(MethodCounters* counters) {
733 // Try to install a pointer to MethodCounters, return true on success.
734 return Atomic::replace_if_null(&_method_counters, counters);
735 }
736
737 void Method::set_exception_handler_entered(int handler_bci) {
738 if (ProfileExceptionHandlers) {
739 MethodData* mdo = method_data();
740 if (mdo != nullptr) {
741 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
742 handler_data.set_exception_handler_entered();
743 }
744 }
745 }
746
747 int Method::extra_stack_words() {
748 // not an inline function, to avoid a header dependency on Interpreter
749 return extra_stack_entries() * Interpreter::stackElementSize;
750 }
751
752 bool Method::compute_has_loops_flag() {
753 BytecodeStream bcs(methodHandle(Thread::current(), this));
754 Bytecodes::Code bc;
755
756 while ((bc = bcs.next()) >= 0) {
757 switch (bc) {
758 case Bytecodes::_ifeq:
759 case Bytecodes::_ifnull:
760 case Bytecodes::_iflt:
761 case Bytecodes::_ifle:
762 case Bytecodes::_ifne:
763 case Bytecodes::_ifnonnull:
764 case Bytecodes::_ifgt:
765 case Bytecodes::_ifge:
766 case Bytecodes::_if_icmpeq:
767 case Bytecodes::_if_icmpne:
768 case Bytecodes::_if_icmplt:
769 case Bytecodes::_if_icmpgt:
770 case Bytecodes::_if_icmple:
771 case Bytecodes::_if_icmpge:
772 case Bytecodes::_if_acmpeq:
773 case Bytecodes::_if_acmpne:
774 case Bytecodes::_goto:
775 case Bytecodes::_jsr:
776 if (bcs.dest() < bcs.next_bci()) {
777 return set_has_loops();
778 }
779 break;
780
781 case Bytecodes::_goto_w:
782 case Bytecodes::_jsr_w:
783 if (bcs.dest_w() < bcs.next_bci()) {
784 return set_has_loops();
785 }
786 break;
787
788 case Bytecodes::_lookupswitch: {
789 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
790 if (lookupswitch.default_offset() < 0) {
791 return set_has_loops();
792 } else {
793 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
794 LookupswitchPair pair = lookupswitch.pair_at(i);
795 if (pair.offset() < 0) {
796 return set_has_loops();
797 }
798 }
799 }
800 break;
801 }
802 case Bytecodes::_tableswitch: {
803 Bytecode_tableswitch tableswitch(this, bcs.bcp());
804 if (tableswitch.default_offset() < 0) {
805 return set_has_loops();
806 } else {
807 for (int i = 0; i < tableswitch.length(); ++i) {
808 if (tableswitch.dest_offset_at(i) < 0) {
809 return set_has_loops();
810 }
811 }
812 }
813 break;
814 }
815 default:
816 break;
817 }
818 }
819
820 _flags.set_has_loops_flag_init(true);
821 return false;
822 }
823
824 bool Method::is_final_method(AccessFlags class_access_flags) const {
825 // or "does_not_require_vtable_entry"
826 // default method or overpass can occur, is not final (reuses vtable entry)
827 // private methods in classes get vtable entries for backward class compatibility.
828 if (is_overpass() || is_default_method()) return false;
829 return is_final() || class_access_flags.is_final();
830 }
831
832 bool Method::is_final_method() const {
833 return is_final_method(method_holder()->access_flags());
834 }
835
836 bool Method::is_default_method() const {
837 if (method_holder() != nullptr &&
838 method_holder()->is_interface() &&
839 !is_abstract() && !is_private()) {
840 return true;
841 } else {
842 return false;
843 }
844 }
845
846 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
847 if (is_final_method(class_access_flags)) return true;
848 #ifdef ASSERT
849 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
850 if (class_access_flags.is_interface()) {
851 ResourceMark rm;
852 assert(is_nonv == is_static() || is_nonv == is_private(),
853 "nonvirtual unexpected for non-static, non-private: %s",
854 name_and_sig_as_C_string());
855 }
856 #endif
857 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
858 return vtable_index() == nonvirtual_vtable_index;
859 }
860
861 bool Method::can_be_statically_bound() const {
862 return can_be_statically_bound(method_holder()->access_flags());
863 }
864
865 bool Method::can_be_statically_bound(InstanceKlass* context) const {
866 return (method_holder() == context) && can_be_statically_bound();
867 }
868
869 /**
870 * Returns false if this is one of specially treated methods for
871 * which we have to provide stack trace in throw in compiled code.
872 * Returns true otherwise.
873 */
874 bool Method::can_omit_stack_trace() {
875 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
876 return false; // All methods in sun.invoke.util.ValueConversions
877 }
878 return true;
879 }
880
881 bool Method::is_accessor() const {
882 return is_getter() || is_setter();
883 }
884
885 bool Method::is_getter() const {
886 if (code_size() != 5) return false;
887 if (size_of_parameters() != 1) return false;
888 if (java_code_at(0) != Bytecodes::_aload_0) return false;
889 if (java_code_at(1) != Bytecodes::_getfield) return false;
890 switch (java_code_at(4)) {
891 case Bytecodes::_ireturn:
892 case Bytecodes::_lreturn:
893 case Bytecodes::_freturn:
894 case Bytecodes::_dreturn:
895 case Bytecodes::_areturn:
896 break;
897 default:
898 return false;
899 }
900 return true;
901 }
902
903 bool Method::is_setter() const {
904 if (code_size() != 6) return false;
905 if (java_code_at(0) != Bytecodes::_aload_0) return false;
906 switch (java_code_at(1)) {
907 case Bytecodes::_iload_1:
908 case Bytecodes::_aload_1:
909 case Bytecodes::_fload_1:
910 if (size_of_parameters() != 2) return false;
911 break;
912 case Bytecodes::_dload_1:
913 case Bytecodes::_lload_1:
914 if (size_of_parameters() != 3) return false;
915 break;
916 default:
917 return false;
918 }
919 if (java_code_at(2) != Bytecodes::_putfield) return false;
920 if (java_code_at(5) != Bytecodes::_return) return false;
921 return true;
922 }
923
924 bool Method::is_constant_getter() const {
925 int last_index = code_size() - 1;
926 // Check if the first 1-3 bytecodes are a constant push
927 // and the last bytecode is a return.
928 return (2 <= code_size() && code_size() <= 4 &&
929 Bytecodes::is_const(java_code_at(0)) &&
930 Bytecodes::length_for(java_code_at(0)) == last_index &&
931 Bytecodes::is_return(java_code_at(last_index)));
932 }
933
934 bool Method::has_valid_initializer_flags() const {
935 return (is_static() ||
936 method_holder()->major_version() < 51);
937 }
938
939 bool Method::is_static_initializer() const {
940 // For classfiles version 51 or greater, ensure that the clinit method is
941 // static. Non-static methods with the name "<clinit>" are not static
942 // initializers. (older classfiles exempted for backward compatibility)
943 return name() == vmSymbols::class_initializer_name() &&
944 has_valid_initializer_flags();
945 }
946
947 bool Method::is_object_initializer() const {
948 return name() == vmSymbols::object_initializer_name();
949 }
950
951 bool Method::needs_clinit_barrier() const {
952 return is_static() && !method_holder()->is_initialized();
953 }
954
955 bool Method::code_has_clinit_barriers() const {
956 nmethod* nm = code();
957 return (nm != nullptr) && nm->has_clinit_barriers();
958 }
959
960 bool Method::is_object_wait0() const {
961 return klass_name() == vmSymbols::java_lang_Object()
962 && name() == vmSymbols::wait_name();
963 }
964
965 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
966 int length = method->checked_exceptions_length();
967 if (length == 0) { // common case
968 return objArrayHandle(THREAD, Universe::the_empty_class_array());
969 } else {
970 methodHandle h_this(THREAD, method);
971 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
972 objArrayHandle mirrors (THREAD, m_oop);
973 for (int i = 0; i < length; i++) {
974 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
975 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
976 if (log_is_enabled(Warning, exceptions) &&
977 !k->is_subclass_of(vmClasses::Throwable_klass())) {
978 ResourceMark rm(THREAD);
979 log_warning(exceptions)(
980 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
981 k->external_name(), method->external_name());
982 }
983 mirrors->obj_at_put(i, k->java_mirror());
984 }
985 return mirrors;
986 }
987 };
988
989
990 int Method::line_number_from_bci(int bci) const {
991 int best_bci = 0;
992 int best_line = -1;
993 if (bci == SynchronizationEntryBCI) bci = 0;
994 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
995 // The line numbers are a short array of 2-tuples [start_pc, line_number].
996 // Not necessarily sorted and not necessarily one-to-one.
997 CompressedLineNumberReadStream stream(compressed_linenumber_table());
998 while (stream.read_pair()) {
999 if (stream.bci() == bci) {
1000 // perfect match
1001 return stream.line();
1002 } else {
1003 // update best_bci/line
1004 if (stream.bci() < bci && stream.bci() >= best_bci) {
1005 best_bci = stream.bci();
1006 best_line = stream.line();
1007 }
1008 }
1009 }
1010 }
1011 return best_line;
1012 }
1013
1014
1015 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1016 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
1017 Thread *thread = Thread::current();
1018 Symbol* klass_name = constants()->klass_name_at(klass_index);
1019 Handle loader(thread, method_holder()->class_loader());
1020 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr;
1021 } else {
1022 return true;
1023 }
1024 }
1025
1026
1027 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1028 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1029 if (must_be_resolved) {
1030 // Make sure klass is resolved in constantpool.
1031 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
1032 }
1033 return is_klass_loaded_by_klass_index(klass_index);
1034 }
1035
1036
1037 void Method::set_native_function(address function, bool post_event_flag) {
1038 assert(function != nullptr, "use clear_native_function to unregister natives");
1039 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1040 address* native_function = native_function_addr();
1041
1042 // We can see racers trying to place the same native function into place. Once
1043 // is plenty.
1044 address current = *native_function;
1045 if (current == function) return;
1046 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1047 function != nullptr) {
1048 // native_method_throw_unsatisfied_link_error_entry() should only
1049 // be passed when post_event_flag is false.
1050 assert(function !=
1051 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1052 "post_event_flag mismatch");
1053
1054 // post the bind event, and possible change the bind function
1055 JvmtiExport::post_native_method_bind(this, &function);
1056 }
1057 *native_function = function;
1058 // This function can be called more than once. We must make sure that we always
1059 // use the latest registered method -> check if a stub already has been generated.
1060 // If so, we have to make it not_entrant.
1061 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1062 if (nm != nullptr) {
1063 nm->make_not_entrant();
1064 }
1065 }
1066
1067
1068 bool Method::has_native_function() const {
1069 if (is_special_native_intrinsic())
1070 return false; // special-cased in SharedRuntime::generate_native_wrapper
1071 address func = native_function();
1072 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1073 }
1074
1075
1076 void Method::clear_native_function() {
1077 // Note: is_method_handle_intrinsic() is allowed here.
1078 set_native_function(
1079 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1080 !native_bind_event_is_interesting);
1081 this->unlink_code();
1082 }
1083
1084
1085 void Method::set_signature_handler(address handler) {
1086 address* signature_handler = signature_handler_addr();
1087 *signature_handler = handler;
1088 }
1089
1090
1091 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1092 assert(reason != nullptr, "must provide a reason");
1093 if (PrintCompilation && report) {
1094 ttyLocker ttyl;
1095 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1096 if (comp_level == CompLevel_all) {
1097 tty->print("all levels ");
1098 } else {
1099 tty->print("level %d ", comp_level);
1100 }
1101 this->print_short_name(tty);
1102 int size = this->code_size();
1103 if (size > 0) {
1104 tty->print(" (%d bytes)", size);
1105 }
1106 if (reason != nullptr) {
1107 tty->print(" %s", reason);
1108 }
1109 tty->cr();
1110 }
1111 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1112 ttyLocker ttyl;
1113 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'",
1114 os::current_thread_id(), is_osr, comp_level);
1115 if (reason != nullptr) {
1116 xtty->print(" reason=\'%s\'", reason);
1117 }
1118 xtty->method(this);
1119 xtty->stamp();
1120 xtty->end_elem();
1121 }
1122 }
1123
1124 bool Method::is_always_compilable() const {
1125 // Generated adapters must be compiled
1126 if (is_special_native_intrinsic() && is_synthetic()) {
1127 assert(!is_not_c1_compilable(), "sanity check");
1128 assert(!is_not_c2_compilable(), "sanity check");
1129 return true;
1130 }
1131
1132 return false;
1133 }
1134
1135 bool Method::is_not_compilable(int comp_level) const {
1136 if (number_of_breakpoints() > 0)
1137 return true;
1138 if (is_always_compilable())
1139 return false;
1140 if (comp_level == CompLevel_any)
1141 return is_not_c1_compilable() && is_not_c2_compilable();
1142 if (is_c1_compile(comp_level))
1143 return is_not_c1_compilable();
1144 if (is_c2_compile(comp_level))
1145 return is_not_c2_compilable();
1146 return false;
1147 }
1148
1149 // call this when compiler finds that this method is not compilable
1150 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1151 if (is_always_compilable()) {
1152 // Don't mark a method which should be always compilable
1153 return;
1154 }
1155 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1156 if (comp_level == CompLevel_all) {
1157 set_is_not_c1_compilable();
1158 set_is_not_c2_compilable();
1159 } else {
1160 if (is_c1_compile(comp_level))
1161 set_is_not_c1_compilable();
1162 if (is_c2_compile(comp_level))
1163 set_is_not_c2_compilable();
1164 }
1165 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1166 }
1167
1168 bool Method::is_not_osr_compilable(int comp_level) const {
1169 if (is_not_compilable(comp_level))
1170 return true;
1171 if (comp_level == CompLevel_any)
1172 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1173 if (is_c1_compile(comp_level))
1174 return is_not_c1_osr_compilable();
1175 if (is_c2_compile(comp_level))
1176 return is_not_c2_osr_compilable();
1177 return false;
1178 }
1179
1180 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1181 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1182 if (comp_level == CompLevel_all) {
1183 set_is_not_c1_osr_compilable();
1184 set_is_not_c2_osr_compilable();
1185 } else {
1186 if (is_c1_compile(comp_level))
1187 set_is_not_c1_osr_compilable();
1188 if (is_c2_compile(comp_level))
1189 set_is_not_c2_osr_compilable();
1190 }
1191 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1192 }
1193
1194 // Revert to using the interpreter and clear out the nmethod
1195 void Method::clear_code() {
1196 // this may be null if c2i adapters have not been made yet
1197 // Only should happen at allocate time.
1198 if (adapter() == nullptr) {
1199 _from_compiled_entry = nullptr;
1200 } else {
1201 _from_compiled_entry = adapter()->get_c2i_entry();
1202 }
1203 OrderAccess::storestore();
1204 _from_interpreted_entry = _i2i_entry;
1205 OrderAccess::storestore();
1206 _code = nullptr;
1207 }
1208
1209 void Method::unlink_code(nmethod *compare) {
1210 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1211 // We need to check if either the _code or _from_compiled_code_entry_point
1212 // refer to this nmethod because there is a race in setting these two fields
1213 // in Method* as seen in bugid 4947125.
1214 if (code() == compare ||
1215 from_compiled_entry() == compare->verified_entry_point()) {
1216 clear_code();
1217 }
1218 }
1219
1220 void Method::unlink_code() {
1221 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1222 clear_code();
1223 }
1224
1225 #if INCLUDE_CDS
1226 // Called by class data sharing to remove any entry points (which are not shared)
1227 void Method::unlink_method() {
1228 assert(CDSConfig::is_dumping_archive(), "sanity");
1229 _code = nullptr;
1230 if (!CDSConfig::is_dumping_adapters() || AdapterHandlerLibrary::is_abstract_method_adapter(_adapter)) {
1231 _adapter = nullptr;
1232 }
1233 _i2i_entry = nullptr;
1234 _from_compiled_entry = nullptr;
1235 _from_interpreted_entry = nullptr;
1236
1237 if (is_native()) {
1238 *native_function_addr() = nullptr;
1239 set_signature_handler(nullptr);
1240 }
1241 NOT_PRODUCT(set_compiled_invocation_count(0);)
1242
1243 clear_method_data();
1244 clear_method_counters();
1245 clear_is_not_c1_compilable();
1246 clear_is_not_c1_osr_compilable();
1247 clear_is_not_c2_compilable();
1248 clear_is_not_c2_osr_compilable();
1249 clear_queued_for_compilation();
1250 set_pending_queue_processed(false);
1251 remove_unshareable_flags();
1252 }
1253
1254 void Method::remove_unshareable_flags() {
1255 // clear all the flags that shouldn't be in the archived version
1256 assert(!is_old(), "must be");
1257 assert(!is_obsolete(), "must be");
1258 assert(!is_deleted(), "must be");
1259
1260 set_is_prefixed_native(false);
1261 set_queued_for_compilation(false);
1262 set_pending_queue_processed(false);
1263 set_is_not_c2_compilable(false);
1264 set_is_not_c1_compilable(false);
1265 set_is_not_c2_osr_compilable(false);
1266 set_on_stack_flag(false);
1267 set_has_upcall_on_method_entry(false);
1268 set_has_upcall_on_method_exit(false);
1269 }
1270 #endif
1271
1272 // Called when the method_holder is getting linked. Setup entrypoints so the method
1273 // is ready to be called from interpreter, compiler, and vtables.
1274 void Method::link_method(const methodHandle& h_method, TRAPS) {
1275 if (log_is_enabled(Info, perf, class, link)) {
1276 ClassLoader::perf_ik_link_methods_count()->inc();
1277 }
1278
1279 // If the code cache is full, we may reenter this function for the
1280 // leftover methods that weren't linked.
1281 if (adapter() != nullptr && !adapter()->is_shared()) {
1282 return;
1283 }
1284 assert( _code == nullptr, "nothing compiled yet" );
1285
1286 // Setup interpreter entrypoint
1287 assert(this == h_method(), "wrong h_method()" );
1288
1289 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache");
1290 address entry = Interpreter::entry_for_method(h_method);
1291 assert(entry != nullptr, "interpreter entry must be non-null");
1292 // Sets both _i2i_entry and _from_interpreted_entry
1293 set_interpreter_entry(entry);
1294
1295 // Don't overwrite already registered native entries.
1296 if (is_native() && !has_native_function()) {
1297 set_native_function(
1298 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1299 !native_bind_event_is_interesting);
1300 }
1301
1302 // Setup compiler entrypoint. This is made eagerly, so we do not need
1303 // special handling of vtables. An alternative is to make adapters more
1304 // lazily by calling make_adapter() from from_compiled_entry() for the
1305 // normal calls. For vtable calls life gets more complicated. When a
1306 // call-site goes mega-morphic we need adapters in all methods which can be
1307 // called from the vtable. We need adapters on such methods that get loaded
1308 // later. Ditto for mega-morphic itable calls. If this proves to be a
1309 // problem we'll make these lazily later.
1310 if (_adapter == nullptr) {
1311 (void) make_adapters(h_method, CHECK);
1312 }
1313
1314 // ONLY USE the h_method now as make_adapter may have blocked
1315
1316 if (h_method->is_continuation_native_intrinsic()) {
1317 _from_interpreted_entry = nullptr;
1318 _from_compiled_entry = nullptr;
1319 _i2i_entry = nullptr;
1320 if (Continuations::enabled()) {
1321 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1322 AdapterHandlerLibrary::create_native_wrapper(h_method);
1323 if (!h_method->has_compiled_code()) {
1324 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1325 }
1326 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1327 }
1328 }
1329 if (_preload_code != nullptr) {
1330 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1331 set_code(h_method, _preload_code);
1332 assert(((nmethod*)_preload_code)->scc_entry() == _scc_entry, "sanity");
1333 }
1334 }
1335
1336 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1337 PerfTraceElapsedTime timer(ClassLoader::perf_method_adapters_time());
1338
1339 // Adapters for compiled code are made eagerly here. They are fairly
1340 // small (generally < 100 bytes) and quick to make (and cached and shared)
1341 // so making them eagerly shouldn't be too expensive.
1342 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1343 if (adapter == nullptr ) {
1344 if (!is_init_completed()) {
1345 // Don't throw exceptions during VM initialization because java.lang.* classes
1346 // might not have been initialized, causing problems when constructing the
1347 // Java exception object.
1348 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1349 } else {
1350 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1351 }
1352 }
1353
1354 mh->set_adapter_entry(adapter);
1355 mh->_from_compiled_entry = adapter->get_c2i_entry();
1356 return adapter->get_c2i_entry();
1357 }
1358
1359 // The verified_code_entry() must be called when a invoke is resolved
1360 // on this method.
1361
1362 // It returns the compiled code entry point, after asserting not null.
1363 // This function is called after potential safepoints so that nmethod
1364 // or adapter that it points to is still live and valid.
1365 // This function must not hit a safepoint!
1366 address Method::verified_code_entry() {
1367 debug_only(NoSafepointVerifier nsv;)
1368 assert(_from_compiled_entry != nullptr, "must be set");
1369 return _from_compiled_entry;
1370 }
1371
1372 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1373 // (could be racing a deopt).
1374 // Not inline to avoid circular ref.
1375 bool Method::check_code() const {
1376 // cached in a register or local. There's a race on the value of the field.
1377 nmethod *code = Atomic::load_acquire(&_code);
1378 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1379 }
1380
1381 // Install compiled code. Instantly it can execute.
1382 void Method::set_code(const methodHandle& mh, nmethod *code) {
1383 assert_lock_strong(NMethodState_lock);
1384 assert( code, "use clear_code to remove code" );
1385 assert( mh->check_code(), "" );
1386
1387 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1388
1389 // These writes must happen in this order, because the interpreter will
1390 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1391 // which jumps to _from_compiled_entry.
1392 mh->_code = code; // Assign before allowing compiled code to exec
1393
1394 int comp_level = code->comp_level();
1395 // In theory there could be a race here. In practice it is unlikely
1396 // and not worth worrying about.
1397 if (comp_level > mh->highest_comp_level()) {
1398 mh->set_highest_comp_level(comp_level);
1399 }
1400
1401 OrderAccess::storestore();
1402 mh->_from_compiled_entry = code->verified_entry_point();
1403 OrderAccess::storestore();
1404
1405 if (mh->is_continuation_native_intrinsic()) {
1406 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1407
1408 if (mh->is_continuation_enter_intrinsic()) {
1409 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1410 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1411 } else if (mh->is_continuation_yield_intrinsic()) {
1412 mh->_i2i_entry = mh->get_i2c_entry();
1413 } else {
1414 guarantee(false, "Unknown Continuation native intrinsic");
1415 }
1416 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1417 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1418 } else if (!mh->is_method_handle_intrinsic()) {
1419 // Instantly compiled code can execute.
1420 mh->_from_interpreted_entry = mh->get_i2c_entry();
1421 }
1422 }
1423
1424
1425 bool Method::is_overridden_in(Klass* k) const {
1426 InstanceKlass* ik = InstanceKlass::cast(k);
1427
1428 if (ik->is_interface()) return false;
1429
1430 // If method is an interface, we skip it - except if it
1431 // is a miranda method
1432 if (method_holder()->is_interface()) {
1433 // Check that method is not a miranda method
1434 if (ik->lookup_method(name(), signature()) == nullptr) {
1435 // No implementation exist - so miranda method
1436 return false;
1437 }
1438 return true;
1439 }
1440
1441 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1442 if (!has_vtable_index()) {
1443 return false;
1444 } else {
1445 Method* vt_m = ik->method_at_vtable(vtable_index());
1446 return vt_m != this;
1447 }
1448 }
1449
1450
1451 // give advice about whether this Method* should be cached or not
1452 bool Method::should_not_be_cached() const {
1453 if (is_old()) {
1454 // This method has been redefined. It is either EMCP or obsolete
1455 // and we don't want to cache it because that would pin the method
1456 // down and prevent it from being collectible if and when it
1457 // finishes executing.
1458 return true;
1459 }
1460
1461 // caching this method should be just fine
1462 return false;
1463 }
1464
1465
1466 /**
1467 * Returns true if this is one of the specially treated methods for
1468 * security related stack walks (like Reflection.getCallerClass).
1469 */
1470 bool Method::is_ignored_by_security_stack_walk() const {
1471 if (intrinsic_id() == vmIntrinsics::_invoke) {
1472 // This is Method.invoke() -- ignore it
1473 return true;
1474 }
1475 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1476 // This is an auxiliary frame -- ignore it
1477 return true;
1478 }
1479 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1480 // This is an internal adapter frame for method handles -- ignore it
1481 return true;
1482 }
1483 return false;
1484 }
1485
1486
1487 // Constant pool structure for invoke methods:
1488 enum {
1489 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1490 _imcp_invoke_signature, // utf8: (variable Symbol*)
1491 _imcp_limit
1492 };
1493
1494 // Test if this method is an MH adapter frame generated by Java code.
1495 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1496 bool Method::is_compiled_lambda_form() const {
1497 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1498 }
1499
1500 // Test if this method is an internal MH primitive method.
1501 bool Method::is_method_handle_intrinsic() const {
1502 vmIntrinsics::ID iid = intrinsic_id();
1503 return (MethodHandles::is_signature_polymorphic(iid) &&
1504 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1505 }
1506
1507 bool Method::has_member_arg() const {
1508 vmIntrinsics::ID iid = intrinsic_id();
1509 return (MethodHandles::is_signature_polymorphic(iid) &&
1510 MethodHandles::has_member_arg(iid));
1511 }
1512
1513 // Make an instance of a signature-polymorphic internal MH primitive.
1514 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1515 Symbol* signature,
1516 TRAPS) {
1517 ResourceMark rm(THREAD);
1518 methodHandle empty;
1519
1520 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1521 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1522 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1523
1524 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1525
1526 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1527 name->increment_refcount();
1528 signature->increment_refcount();
1529
1530 int cp_length = _imcp_limit;
1531 ClassLoaderData* loader_data = holder->class_loader_data();
1532 constantPoolHandle cp;
1533 {
1534 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1535 cp = constantPoolHandle(THREAD, cp_oop);
1536 }
1537 cp->copy_fields(holder->constants());
1538 cp->set_pool_holder(holder);
1539 cp->symbol_at_put(_imcp_invoke_name, name);
1540 cp->symbol_at_put(_imcp_invoke_signature, signature);
1541 cp->set_has_preresolution();
1542 cp->set_is_for_method_handle_intrinsic();
1543
1544 // decide on access bits: public or not?
1545 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1546 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1547 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1548 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1549
1550 methodHandle m;
1551 {
1552 InlineTableSizes sizes;
1553 Method* m_oop = Method::allocate(loader_data, 0,
1554 accessFlags_from(flags_bits), &sizes,
1555 ConstMethod::NORMAL,
1556 name,
1557 CHECK_(empty));
1558 m = methodHandle(THREAD, m_oop);
1559 }
1560 m->set_constants(cp());
1561 m->set_name_index(_imcp_invoke_name);
1562 m->set_signature_index(_imcp_invoke_signature);
1563 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1564 assert(m->signature() == signature, "");
1565 m->constMethod()->compute_from_signature(signature, must_be_static);
1566 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1567 assert(m->is_method_handle_intrinsic(), "");
1568 #ifdef ASSERT
1569 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1570 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1571 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1572 #endif //ASSERT
1573
1574 // Finally, set up its entry points.
1575 assert(m->can_be_statically_bound(), "");
1576 m->set_vtable_index(Method::nonvirtual_vtable_index);
1577 m->link_method(m, CHECK_(empty));
1578
1579 if (iid == vmIntrinsics::_linkToNative) {
1580 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1581 }
1582 if (log_is_enabled(Debug, methodhandles)) {
1583 LogTarget(Debug, methodhandles) lt;
1584 LogStream ls(lt);
1585 m->print_on(&ls);
1586 }
1587
1588 return m;
1589 }
1590
1591 #if INCLUDE_CDS
1592 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1593 m->restore_adapter(CHECK);
1594 if (m->adapter() != nullptr) {
1595 m->adapter()->restore_unshareable_info(CHECK);
1596 m->set_from_compiled_entry(m->adapter()->get_c2i_entry());
1597 }
1598 m->link_method(m, CHECK);
1599
1600 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1601 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1602 }
1603 }
1604 #endif
1605
1606 Klass* Method::check_non_bcp_klass(Klass* klass) {
1607 if (klass != nullptr && klass->class_loader() != nullptr) {
1608 if (klass->is_objArray_klass())
1609 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1610 return klass;
1611 }
1612 return nullptr;
1613 }
1614
1615
1616 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1617 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1618 // Code below does not work for native methods - they should never get rewritten anyway
1619 assert(!m->is_native(), "cannot rewrite native methods");
1620 // Allocate new Method*
1621 AccessFlags flags = m->access_flags();
1622
1623 ConstMethod* cm = m->constMethod();
1624 int checked_exceptions_len = cm->checked_exceptions_length();
1625 int localvariable_len = cm->localvariable_table_length();
1626 int exception_table_len = cm->exception_table_length();
1627 int method_parameters_len = cm->method_parameters_length();
1628 int method_annotations_len = cm->method_annotations_length();
1629 int parameter_annotations_len = cm->parameter_annotations_length();
1630 int type_annotations_len = cm->type_annotations_length();
1631 int default_annotations_len = cm->default_annotations_length();
1632
1633 InlineTableSizes sizes(
1634 localvariable_len,
1635 new_compressed_linenumber_size,
1636 exception_table_len,
1637 checked_exceptions_len,
1638 method_parameters_len,
1639 cm->generic_signature_index(),
1640 method_annotations_len,
1641 parameter_annotations_len,
1642 type_annotations_len,
1643 default_annotations_len,
1644 0);
1645
1646 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1647 Method* newm_oop = Method::allocate(loader_data,
1648 new_code_length,
1649 flags,
1650 &sizes,
1651 m->method_type(),
1652 m->name(),
1653 CHECK_(methodHandle()));
1654 methodHandle newm (THREAD, newm_oop);
1655
1656 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1657 ConstMethod* newcm = newm->constMethod();
1658 int new_const_method_size = newm->constMethod()->size();
1659
1660 // This works because the source and target are both Methods. Some compilers
1661 // (e.g., clang) complain that the target vtable pointer will be stomped,
1662 // so cast away newm()'s and m()'s Methodness.
1663 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1664
1665 // Create shallow copy of ConstMethod.
1666 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1667
1668 // Reset correct method/const method, method size, and parameter info
1669 newm->set_constMethod(newcm);
1670 newm->constMethod()->set_code_size(new_code_length);
1671 newm->constMethod()->set_constMethod_size(new_const_method_size);
1672 assert(newm->code_size() == new_code_length, "check");
1673 assert(newm->method_parameters_length() == method_parameters_len, "check");
1674 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1675 assert(newm->exception_table_length() == exception_table_len, "check");
1676 assert(newm->localvariable_table_length() == localvariable_len, "check");
1677 // Copy new byte codes
1678 memcpy(newm->code_base(), new_code, new_code_length);
1679 // Copy line number table
1680 if (new_compressed_linenumber_size > 0) {
1681 memcpy(newm->compressed_linenumber_table(),
1682 new_compressed_linenumber_table,
1683 new_compressed_linenumber_size);
1684 }
1685 // Copy method_parameters
1686 if (method_parameters_len > 0) {
1687 memcpy(newm->method_parameters_start(),
1688 m->method_parameters_start(),
1689 method_parameters_len * sizeof(MethodParametersElement));
1690 }
1691 // Copy checked_exceptions
1692 if (checked_exceptions_len > 0) {
1693 memcpy(newm->checked_exceptions_start(),
1694 m->checked_exceptions_start(),
1695 checked_exceptions_len * sizeof(CheckedExceptionElement));
1696 }
1697 // Copy exception table
1698 if (exception_table_len > 0) {
1699 memcpy(newm->exception_table_start(),
1700 m->exception_table_start(),
1701 exception_table_len * sizeof(ExceptionTableElement));
1702 }
1703 // Copy local variable number table
1704 if (localvariable_len > 0) {
1705 memcpy(newm->localvariable_table_start(),
1706 m->localvariable_table_start(),
1707 localvariable_len * sizeof(LocalVariableTableElement));
1708 }
1709 // Copy stackmap table
1710 if (m->has_stackmap_table()) {
1711 int code_attribute_length = m->stackmap_data()->length();
1712 Array<u1>* stackmap_data =
1713 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1714 memcpy((void*)stackmap_data->adr_at(0),
1715 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1716 newm->set_stackmap_data(stackmap_data);
1717 }
1718
1719 // copy annotations over to new method
1720 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1721 return newm;
1722 }
1723
1724 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1725 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1726 // because we are not loading from core libraries
1727 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1728 // which does not use the class default class loader so we check for its loader here
1729 const InstanceKlass* ik = InstanceKlass::cast(holder);
1730 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1731 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1732 }
1733
1734 // see if the klass name is well-known:
1735 Symbol* klass_name = ik->name();
1736 vmSymbolID id = vmSymbols::find_sid(klass_name);
1737 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1738 return id;
1739 } else {
1740 return vmSymbolID::NO_SID;
1741 }
1742 }
1743
1744 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1745 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1746 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1747 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1748 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1749
1750 // the klass name is well-known:
1751 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1752 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1753
1754 // ditto for method and signature:
1755 vmSymbolID name_id = vmSymbols::find_sid(name());
1756 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1757 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1758 && name_id == vmSymbolID::NO_SID) {
1759 return;
1760 }
1761 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1762 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1763 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1764 && sig_id == vmSymbolID::NO_SID) {
1765 return;
1766 }
1767
1768 u2 flags = access_flags().as_method_flags();
1769 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1770 if (id != vmIntrinsics::_none) {
1771 set_intrinsic_id(id);
1772 if (id == vmIntrinsics::_Class_cast) {
1773 // Even if the intrinsic is rejected, we want to inline this simple method.
1774 set_force_inline();
1775 }
1776 return;
1777 }
1778
1779 // A few slightly irregular cases:
1780 switch (klass_id) {
1781 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1782 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1783 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1784 if (!is_native()) break;
1785 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1786 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1787 id = vmIntrinsics::_none;
1788 break;
1789
1790 default:
1791 break;
1792 }
1793
1794 if (id != vmIntrinsics::_none) {
1795 // Set up its iid. It is an alias method.
1796 set_intrinsic_id(id);
1797 return;
1798 }
1799 }
1800
1801 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1802 if (!THREAD->can_call_java()) {
1803 // There is nothing useful this routine can do from within the Compile thread.
1804 // Hopefully, the signature contains only well-known classes.
1805 // We could scan for this and return true/false, but the caller won't care.
1806 return false;
1807 }
1808 bool sig_is_loaded = true;
1809 ResourceMark rm(THREAD);
1810 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1811 if (ss.is_reference()) {
1812 // load everything, including arrays "[Lfoo;"
1813 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1814 // We are loading classes eagerly. If a ClassNotFoundException or
1815 // a LinkageError was generated, be sure to ignore it.
1816 if (HAS_PENDING_EXCEPTION) {
1817 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1818 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1819 CLEAR_PENDING_EXCEPTION;
1820 } else {
1821 return false;
1822 }
1823 }
1824 if( klass == nullptr) { sig_is_loaded = false; }
1825 }
1826 }
1827 return sig_is_loaded;
1828 }
1829
1830 // Exposed so field engineers can debug VM
1831 void Method::print_short_name(outputStream* st) const {
1832 ResourceMark rm;
1833 #ifdef PRODUCT
1834 st->print(" %s::", method_holder()->external_name());
1835 #else
1836 st->print(" %s::", method_holder()->internal_name());
1837 #endif
1838 name()->print_symbol_on(st);
1839 if (WizardMode) signature()->print_symbol_on(st);
1840 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1841 MethodHandles::print_as_basic_type_signature_on(st, signature());
1842 }
1843
1844 // Comparer for sorting an object array containing
1845 // Method*s.
1846 static int method_comparator(Method* a, Method* b) {
1847 return a->name()->fast_compare(b->name());
1848 }
1849
1850 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1851 // default_methods also uses this without the ordering for fast find_method
1852 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1853 int length = methods->length();
1854 if (length > 1) {
1855 if (func == nullptr) {
1856 func = method_comparator;
1857 }
1858 {
1859 NoSafepointVerifier nsv;
1860 QuickSort::sort(methods->data(), length, func);
1861 }
1862 // Reset method ordering
1863 if (set_idnums) {
1864 for (u2 i = 0; i < length; i++) {
1865 Method* m = methods->at(i);
1866 m->set_method_idnum(i);
1867 m->set_orig_method_idnum(i);
1868 }
1869 }
1870 }
1871 }
1872
1873 //-----------------------------------------------------------------------------------
1874 // Non-product code unless JVM/TI needs it
1875
1876 #if !defined(PRODUCT) || INCLUDE_JVMTI
1877 class SignatureTypePrinter : public SignatureTypeNames {
1878 private:
1879 outputStream* _st;
1880 bool _use_separator;
1881
1882 void type_name(const char* name) {
1883 if (_use_separator) _st->print(", ");
1884 _st->print("%s", name);
1885 _use_separator = true;
1886 }
1887
1888 public:
1889 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1890 _st = st;
1891 _use_separator = false;
1892 }
1893
1894 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1895 void print_returntype() { _use_separator = false; do_type(return_type()); }
1896 };
1897
1898
1899 void Method::print_name(outputStream* st) const {
1900 Thread *thread = Thread::current();
1901 ResourceMark rm(thread);
1902 st->print("%s ", is_static() ? "static" : "virtual");
1903 if (WizardMode) {
1904 st->print("%s.", method_holder()->internal_name());
1905 name()->print_symbol_on(st);
1906 signature()->print_symbol_on(st);
1907 } else {
1908 SignatureTypePrinter sig(signature(), st);
1909 sig.print_returntype();
1910 st->print(" %s.", method_holder()->internal_name());
1911 name()->print_symbol_on(st);
1912 st->print("(");
1913 sig.print_parameters();
1914 st->print(")");
1915 }
1916 }
1917 #endif // !PRODUCT || INCLUDE_JVMTI
1918
1919
1920 void Method::print_codes_on(outputStream* st, int flags) const {
1921 print_codes_on(0, code_size(), st, flags);
1922 }
1923
1924 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1925 Thread *thread = Thread::current();
1926 ResourceMark rm(thread);
1927 methodHandle mh (thread, (Method*)this);
1928 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1929 }
1930
1931 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1932 _bci = 0;
1933 _line = 0;
1934 };
1935
1936 bool CompressedLineNumberReadStream::read_pair() {
1937 jubyte next = read_byte();
1938 // Check for terminator
1939 if (next == 0) return false;
1940 if (next == 0xFF) {
1941 // Escape character, regular compression used
1942 _bci += read_signed_int();
1943 _line += read_signed_int();
1944 } else {
1945 // Single byte compression used
1946 _bci += next >> 3;
1947 _line += next & 0x7;
1948 }
1949 return true;
1950 }
1951
1952 #if INCLUDE_JVMTI
1953
1954 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1955 BreakpointInfo* bp = method_holder()->breakpoints();
1956 for (; bp != nullptr; bp = bp->next()) {
1957 if (bp->match(this, bci)) {
1958 return bp->orig_bytecode();
1959 }
1960 }
1961 {
1962 ResourceMark rm;
1963 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1964 }
1965 return Bytecodes::_shouldnotreachhere;
1966 }
1967
1968 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1969 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1970 BreakpointInfo* bp = method_holder()->breakpoints();
1971 for (; bp != nullptr; bp = bp->next()) {
1972 if (bp->match(this, bci)) {
1973 bp->set_orig_bytecode(code);
1974 // and continue, in case there is more than one
1975 }
1976 }
1977 }
1978
1979 void Method::set_breakpoint(int bci) {
1980 InstanceKlass* ik = method_holder();
1981 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1982 bp->set_next(ik->breakpoints());
1983 ik->set_breakpoints(bp);
1984 // do this last:
1985 bp->set(this);
1986 }
1987
1988 static void clear_matches(Method* m, int bci) {
1989 InstanceKlass* ik = m->method_holder();
1990 BreakpointInfo* prev_bp = nullptr;
1991 BreakpointInfo* next_bp;
1992 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1993 next_bp = bp->next();
1994 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1995 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1996 // do this first:
1997 bp->clear(m);
1998 // unhook it
1999 if (prev_bp != nullptr)
2000 prev_bp->set_next(next_bp);
2001 else
2002 ik->set_breakpoints(next_bp);
2003 delete bp;
2004 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
2005 // at same location. So we have multiple matching (method_index and bci)
2006 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
2007 // breakpoint for clear_breakpoint request and keep all other method versions
2008 // BreakpointInfo for future clear_breakpoint request.
2009 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
2010 // which is being called when class is unloaded. We delete all the Breakpoint
2011 // information for all versions of method. We may not correctly restore the original
2012 // bytecode in all method versions, but that is ok. Because the class is being unloaded
2013 // so these methods won't be used anymore.
2014 if (bci >= 0) {
2015 break;
2016 }
2017 } else {
2018 // This one is a keeper.
2019 prev_bp = bp;
2020 }
2021 }
2022 }
2023
2024 void Method::clear_breakpoint(int bci) {
2025 assert(bci >= 0, "");
2026 clear_matches(this, bci);
2027 }
2028
2029 void Method::clear_all_breakpoints() {
2030 clear_matches(this, -1);
2031 }
2032
2033 #endif // INCLUDE_JVMTI
2034
2035 int Method::invocation_count() const {
2036 MethodCounters* mcs = method_counters();
2037 MethodData* mdo = method_data();
2038 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) ||
2039 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) {
2040 return InvocationCounter::count_limit;
2041 } else {
2042 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) +
2043 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0);
2044 }
2045 }
2046
2047 int Method::backedge_count() const {
2048 MethodCounters* mcs = method_counters();
2049 MethodData* mdo = method_data();
2050 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) ||
2051 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) {
2052 return InvocationCounter::count_limit;
2053 } else {
2054 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) +
2055 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0);
2056 }
2057 }
2058
2059 int Method::highest_comp_level() const {
2060 const MethodCounters* mcs = method_counters();
2061 nmethod* nm = code();
2062 int level = (nm != nullptr) ? nm->comp_level() : CompLevel_none;
2063 if (mcs != nullptr) {
2064 return MAX2(mcs->highest_comp_level(), level);
2065 } else {
2066 return CompLevel_none;
2067 }
2068 }
2069
2070 int Method::highest_osr_comp_level() const {
2071 const MethodCounters* mcs = method_counters();
2072 if (mcs != nullptr) {
2073 return mcs->highest_osr_comp_level();
2074 } else {
2075 return CompLevel_none;
2076 }
2077 }
2078
2079 void Method::set_highest_comp_level(int level) {
2080 MethodCounters* mcs = method_counters();
2081 if (mcs != nullptr) {
2082 mcs->set_highest_comp_level(level);
2083 }
2084 }
2085
2086 void Method::set_highest_osr_comp_level(int level) {
2087 MethodCounters* mcs = method_counters();
2088 if (mcs != nullptr) {
2089 mcs->set_highest_osr_comp_level(level);
2090 }
2091 }
2092
2093 #if INCLUDE_JVMTI
2094
2095 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2096 _bci = bci;
2097 _name_index = m->name_index();
2098 _signature_index = m->signature_index();
2099 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2100 if (_orig_bytecode == Bytecodes::_breakpoint)
2101 _orig_bytecode = m->orig_bytecode_at(_bci);
2102 _next = nullptr;
2103 }
2104
2105 void BreakpointInfo::set(Method* method) {
2106 #ifdef ASSERT
2107 {
2108 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2109 if (code == Bytecodes::_breakpoint)
2110 code = method->orig_bytecode_at(_bci);
2111 assert(orig_bytecode() == code, "original bytecode must be the same");
2112 }
2113 #endif
2114 Thread *thread = Thread::current();
2115 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2116 method->incr_number_of_breakpoints(thread);
2117 {
2118 // Deoptimize all dependents on this method
2119 HandleMark hm(thread);
2120 methodHandle mh(thread, method);
2121 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2122 }
2123 }
2124
2125 void BreakpointInfo::clear(Method* method) {
2126 *method->bcp_from(_bci) = orig_bytecode();
2127 assert(method->number_of_breakpoints() > 0, "must not go negative");
2128 method->decr_number_of_breakpoints(Thread::current());
2129 }
2130
2131 #endif // INCLUDE_JVMTI
2132
2133 // jmethodID handling
2134
2135 // This is a block allocating object, sort of like JNIHandleBlock, only a
2136 // lot simpler.
2137 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2138 // never get rid of it.
2139
2140 static const int min_block_size = 8;
2141
2142 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2143 friend class JNIMethodBlock;
2144 Method** _methods;
2145 int _number_of_methods;
2146 int _top;
2147 JNIMethodBlockNode* _next;
2148
2149 public:
2150
2151 JNIMethodBlockNode(int num_methods = min_block_size);
2152
2153 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2154
2155 void ensure_methods(int num_addl_methods) {
2156 if (_top < _number_of_methods) {
2157 num_addl_methods -= _number_of_methods - _top;
2158 if (num_addl_methods <= 0) {
2159 return;
2160 }
2161 }
2162 if (_next == nullptr) {
2163 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2164 } else {
2165 _next->ensure_methods(num_addl_methods);
2166 }
2167 }
2168 };
2169
2170 class JNIMethodBlock : public CHeapObj<mtClass> {
2171 JNIMethodBlockNode _head;
2172 JNIMethodBlockNode *_last_free;
2173 public:
2174 static Method* const _free_method;
2175
2176 JNIMethodBlock(int initial_capacity = min_block_size)
2177 : _head(initial_capacity), _last_free(&_head) {}
2178
2179 void ensure_methods(int num_addl_methods) {
2180 _last_free->ensure_methods(num_addl_methods);
2181 }
2182
2183 Method** add_method(Method* m) {
2184 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2185 if (b->_top < b->_number_of_methods) {
2186 // top points to the next free entry.
2187 int i = b->_top;
2188 b->_methods[i] = m;
2189 b->_top++;
2190 _last_free = b;
2191 return &(b->_methods[i]);
2192 } else if (b->_top == b->_number_of_methods) {
2193 // if the next free entry ran off the block see if there's a free entry
2194 for (int i = 0; i < b->_number_of_methods; i++) {
2195 if (b->_methods[i] == _free_method) {
2196 b->_methods[i] = m;
2197 _last_free = b;
2198 return &(b->_methods[i]);
2199 }
2200 }
2201 // Only check each block once for frees. They're very unlikely.
2202 // Increment top past the end of the block.
2203 b->_top++;
2204 }
2205 // need to allocate a next block.
2206 if (b->_next == nullptr) {
2207 b->_next = _last_free = new JNIMethodBlockNode();
2208 }
2209 }
2210 guarantee(false, "Should always allocate a free block");
2211 return nullptr;
2212 }
2213
2214 bool contains(Method** m) {
2215 if (m == nullptr) return false;
2216 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2217 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2218 // This is a bit of extra checking, for two reasons. One is
2219 // that contains() deals with pointers that are passed in by
2220 // JNI code, so making sure that the pointer is aligned
2221 // correctly is valuable. The other is that <= and > are
2222 // technically not defined on pointers, so the if guard can
2223 // pass spuriously; no modern compiler is likely to make that
2224 // a problem, though (and if one did, the guard could also
2225 // fail spuriously, which would be bad).
2226 ptrdiff_t idx = m - b->_methods;
2227 if (b->_methods + idx == m) {
2228 return true;
2229 }
2230 }
2231 }
2232 return false; // not found
2233 }
2234
2235 // During class unloading the methods are cleared, which is different
2236 // than freed.
2237 void clear_all_methods() {
2238 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2239 for (int i = 0; i< b->_number_of_methods; i++) {
2240 b->_methods[i] = nullptr;
2241 }
2242 }
2243 }
2244 #ifndef PRODUCT
2245 int count_methods() {
2246 // count all allocated methods
2247 int count = 0;
2248 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2249 for (int i = 0; i< b->_number_of_methods; i++) {
2250 if (b->_methods[i] != _free_method) count++;
2251 }
2252 }
2253 return count;
2254 }
2255 #endif // PRODUCT
2256 };
2257
2258 // Something that can't be mistaken for an address or a markWord
2259 Method* const JNIMethodBlock::_free_method = (Method*)55;
2260
2261 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2262 _number_of_methods = MAX2(num_methods, min_block_size);
2263 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2264 for (int i = 0; i < _number_of_methods; i++) {
2265 _methods[i] = JNIMethodBlock::_free_method;
2266 }
2267 }
2268
2269 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2270 // Have to add jmethod_ids() to class loader data thread-safely.
2271 // Also have to add the method to the list safely, which the lock
2272 // protects as well.
2273 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2274 if (cld->jmethod_ids() == nullptr) {
2275 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2276 } else {
2277 cld->jmethod_ids()->ensure_methods(capacity);
2278 }
2279 }
2280
2281 // Add a method id to the jmethod_ids
2282 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2283 // Have to add jmethod_ids() to class loader data thread-safely.
2284 // Also have to add the method to the list safely, which the lock
2285 // protects as well.
2286 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2287
2288 ResourceMark rm;
2289 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name());
2290 if (cld->jmethod_ids() == nullptr) {
2291 cld->set_jmethod_ids(new JNIMethodBlock());
2292 }
2293 // jmethodID is a pointer to Method*
2294 return (jmethodID)cld->jmethod_ids()->add_method(m);
2295 }
2296
2297 jmethodID Method::jmethod_id() {
2298 methodHandle mh(Thread::current(), this);
2299 return method_holder()->get_jmethod_id(mh);
2300 }
2301
2302 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2303 // Can't assert the method_holder is the same because the new method has the
2304 // scratch method holder.
2305 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2306 == new_method->method_holder()->class_loader() ||
2307 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2308 "changing to a different class loader");
2309 // Just change the method in place, jmethodID pointer doesn't change.
2310 *((Method**)jmid) = new_method;
2311 }
2312
2313 bool Method::is_method_id(jmethodID mid) {
2314 Method* m = resolve_jmethod_id(mid);
2315 assert(m != nullptr, "should be called with non-null method");
2316 InstanceKlass* ik = m->method_holder();
2317 ClassLoaderData* cld = ik->class_loader_data();
2318 if (cld->jmethod_ids() == nullptr) return false;
2319 return (cld->jmethod_ids()->contains((Method**)mid));
2320 }
2321
2322 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2323 if (mid == nullptr) return nullptr;
2324 Method* o = resolve_jmethod_id(mid);
2325 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2326 return nullptr;
2327 }
2328 // Method should otherwise be valid. Assert for testing.
2329 assert(is_valid_method(o), "should be valid jmethodid");
2330 // If the method's class holder object is unreferenced, but not yet marked as
2331 // unloaded, we need to return null here too because after a safepoint, its memory
2332 // will be reclaimed.
2333 return o->method_holder()->is_loader_alive() ? o : nullptr;
2334 };
2335
2336 void Method::set_on_stack(const bool value) {
2337 // Set both the method itself and its constant pool. The constant pool
2338 // on stack means some method referring to it is also on the stack.
2339 constants()->set_on_stack(value);
2340
2341 bool already_set = on_stack_flag();
2342 set_on_stack_flag(value);
2343 if (value && !already_set) {
2344 MetadataOnStackMark::record(this);
2345 }
2346 }
2347
2348 void Method::record_gc_epoch() {
2349 // If any method is on the stack in continuations, none of them can be reclaimed,
2350 // so save the marking cycle to check for the whole class in the cpCache.
2351 // The cpCache is writeable.
2352 constants()->cache()->record_gc_epoch();
2353 }
2354
2355 // Called when the class loader is unloaded to make all methods weak.
2356 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2357 loader_data->jmethod_ids()->clear_all_methods();
2358 }
2359
2360 void Method::clear_jmethod_id() {
2361 // Being at a safepoint prevents racing against other class redefinitions
2362 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2363 // The jmethodID is not stored in the Method instance, we need to look it up first
2364 jmethodID methodid = find_jmethod_id_or_null();
2365 // We need to make sure that jmethodID actually resolves to this method
2366 // - multiple redefined versions may share jmethodID slots and if a method
2367 // has already been rewired to a newer version we could be removing reference
2368 // to a still existing method instance
2369 if (methodid != nullptr && *((Method**)methodid) == this) {
2370 *((Method**)methodid) = nullptr;
2371 }
2372 }
2373
2374 bool Method::has_method_vptr(const void* ptr) {
2375 Method m;
2376 // This assumes that the vtbl pointer is the first word of a C++ object.
2377 return dereference_vptr(&m) == dereference_vptr(ptr);
2378 }
2379
2380 // Check that this pointer is valid by checking that the vtbl pointer matches
2381 bool Method::is_valid_method(const Method* m) {
2382 if (m == nullptr) {
2383 return false;
2384 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2385 // Quick sanity check on pointer.
2386 return false;
2387 } else if (!os::is_readable_range(m, m + 1)) {
2388 return false;
2389 } else if (m->is_shared()) {
2390 return CppVtables::is_valid_shared_method(m);
2391 } else if (Metaspace::contains_non_shared(m)) {
2392 return has_method_vptr((const void*)m);
2393 } else {
2394 return false;
2395 }
2396 }
2397
2398 #ifndef PRODUCT
2399 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2400 out->print("%d", loader_data->jmethod_ids()->count_methods());
2401 }
2402 #endif // PRODUCT
2403
2404
2405 // Printing
2406
2407 #ifndef PRODUCT
2408
2409 void Method::print_on(outputStream* st) const {
2410 ResourceMark rm;
2411 assert(is_method(), "must be method");
2412 st->print_cr("%s", internal_name());
2413 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2414 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2415 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2416 constants()->print_value_on(st); st->cr();
2417 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr();
2418 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2419 st->print (" - name: "); name()->print_value_on(st); st->cr();
2420 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2421 st->print_cr(" - max stack: %d", max_stack());
2422 st->print_cr(" - max locals: %d", max_locals());
2423 st->print_cr(" - size of params: %d", size_of_parameters());
2424 st->print_cr(" - method size: %d", method_size());
2425 if (intrinsic_id() != vmIntrinsics::_none)
2426 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2427 if (highest_comp_level() != CompLevel_none)
2428 st->print_cr(" - highest level: %d", highest_comp_level());
2429 st->print_cr(" - vtable index: %d", _vtable_index);
2430 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2431 st->print( " - adapters: ");
2432 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2433 if (a == nullptr)
2434 st->print_cr(PTR_FORMAT, p2i(a));
2435 else
2436 a->print_adapter_on(st);
2437 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2438 st->print_cr(" - code size: %d", code_size());
2439 if (code_size() != 0) {
2440 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2441 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2442 }
2443 if (method_data() != nullptr) {
2444 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2445 }
2446 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2447 if (checked_exceptions_length() > 0) {
2448 CheckedExceptionElement* table = checked_exceptions_start();
2449 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2450 if (Verbose) {
2451 for (int i = 0; i < checked_exceptions_length(); i++) {
2452 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2453 }
2454 }
2455 }
2456 if (has_linenumber_table()) {
2457 u_char* table = compressed_linenumber_table();
2458 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2459 if (Verbose) {
2460 CompressedLineNumberReadStream stream(table);
2461 while (stream.read_pair()) {
2462 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2463 }
2464 }
2465 }
2466 st->print_cr(" - localvar length: %d", localvariable_table_length());
2467 if (localvariable_table_length() > 0) {
2468 LocalVariableTableElement* table = localvariable_table_start();
2469 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2470 if (Verbose) {
2471 for (int i = 0; i < localvariable_table_length(); i++) {
2472 int bci = table[i].start_bci;
2473 int len = table[i].length;
2474 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2475 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2476 int slot = table[i].slot;
2477 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2478 }
2479 }
2480 }
2481 if (code() != nullptr) {
2482 st->print (" - compiled code: ");
2483 code()->print_value_on(st);
2484 }
2485 if (is_native()) {
2486 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2487 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2488 }
2489 }
2490
2491 void Method::print_linkage_flags(outputStream* st) {
2492 access_flags().print_on(st);
2493 if (is_default_method()) {
2494 st->print("default ");
2495 }
2496 if (is_overpass()) {
2497 st->print("overpass ");
2498 }
2499 }
2500 #endif //PRODUCT
2501
2502 void Method::print_value_on(outputStream* st) const {
2503 assert(is_method(), "must be method");
2504 st->print("%s", internal_name());
2505 print_address_on(st);
2506 st->print(" ");
2507 name()->print_value_on(st);
2508 st->print(" ");
2509 signature()->print_value_on(st);
2510 st->print(" in ");
2511 method_holder()->print_value_on(st);
2512 if (WizardMode) st->print("#%d", _vtable_index);
2513 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2514 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2515 }
2516
2517 // Verification
2518
2519 void Method::verify_on(outputStream* st) {
2520 guarantee(is_method(), "object must be method");
2521 guarantee(constants()->is_constantPool(), "should be constant pool");
2522 MethodData* md = method_data();
2523 guarantee(md == nullptr ||
2524 md->is_methodData(), "should be method data");
2525 }