1 /*
2 * Copyright (c) 1997, 2024, 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 "precompiled.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "cds/cppVtables.hpp"
28 #include "cds/metaspaceShared.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderDataGraph.hpp"
31 #include "classfile/metadataOnStackMark.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmClasses.hpp"
35 #include "code/codeCache.hpp"
36 #include "code/debugInfoRec.hpp"
37 #include "compiler/compilationPolicy.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecodeStream.hpp"
40 #include "interpreter/bytecodeTracer.hpp"
41 #include "interpreter/bytecodes.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "logging/logTag.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/metadataFactory.hpp"
49 #include "memory/metaspaceClosure.hpp"
50 #include "memory/oopFactory.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "memory/universe.hpp"
53 #include "nmt/memTracker.hpp"
54 #include "oops/constMethod.hpp"
55 #include "oops/constantPool.hpp"
56 #include "oops/klass.inline.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/methodData.hpp"
59 #include "oops/objArrayKlass.hpp"
60 #include "oops/objArrayOop.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/symbol.hpp"
63 #include "oops/trainingData.hpp"
64 #include "prims/jvmtiExport.hpp"
65 #include "prims/methodHandles.hpp"
66 #include "runtime/atomic.hpp"
67 #include "runtime/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 // Only GC uses the OopMapCache during thread stack root scanning
318 // any other uses generate an oopmap but do not save it in the cache.
319 if (Universe::heap()->is_stw_gc_active()) {
320 method_holder()->mask_for(h_this, bci, mask);
321 } else {
322 OopMapCache::compute_one_oop_map(h_this, bci, mask);
323 }
324 return;
325 }
326
327
328 int Method::bci_from(address bcp) const {
329 if (is_native() && bcp == 0) {
330 return 0;
331 }
332 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
333 // may call this after interrupting a nested ResourceMark.
334 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
335 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
336
337 return int(bcp - code_base());
338 }
339
340
341 int Method::validate_bci(int bci) const {
342 return (bci == 0 || bci < code_size()) ? bci : -1;
343 }
344
345 // Return bci if it appears to be a valid bcp
346 // Return -1 otherwise.
347 // Used by profiling code, when invalid data is a possibility.
348 // The caller is responsible for validating the Method* itself.
349 int Method::validate_bci_from_bcp(address bcp) const {
350 // keep bci as -1 if not a valid bci
351 int bci = -1;
352 if (bcp == 0 || bcp == code_base()) {
353 // code_size() may return 0 and we allow 0 here
354 // the method may be native
355 bci = 0;
356 } else if (contains(bcp)) {
357 bci = int(bcp - code_base());
358 }
359 // Assert that if we have dodged any asserts, bci is negative.
360 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
361 return bci;
362 }
363
364 address Method::bcp_from(int bci) const {
365 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
366 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
367 address bcp = code_base() + bci;
368 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
369 return bcp;
370 }
371
372 address Method::bcp_from(address bcp) const {
373 if (is_native() && bcp == nullptr) {
374 return code_base();
375 } else {
376 return bcp;
377 }
378 }
379
380 int Method::size(bool is_native) {
381 // If native, then include pointers for native_function and signature_handler
382 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
383 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
384 return align_metadata_size(header_size() + extra_words);
385 }
386
387 Symbol* Method::klass_name() const {
388 return method_holder()->name();
389 }
390
391 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
392 LogStreamHandle(Trace, cds) lsh;
393 if (lsh.is_enabled()) {
394 lsh.print("Iter(Method): %p ", this);
395 print_external_name(&lsh);
396 lsh.cr();
397 }
398 if (method_holder() != nullptr && !method_holder()->is_rewritten()) {
399 // holder is null for MH intrinsic methods
400 it->push(&_constMethod, MetaspaceClosure::_writable);
401 } else {
402 it->push(&_constMethod);
403 }
404 it->push(&_method_data);
405 it->push(&_method_counters);
406 NOT_PRODUCT(it->push(&_name);)
407 }
408
409 #if INCLUDE_CDS
410 // Attempt to return method to original state. Clear any pointers
411 // (to objects outside the shared spaces). We won't be able to predict
412 // where they should point in a new JVM. Further initialize some
413 // entries now in order allow them to be write protected later.
414
415 void Method::remove_unshareable_info() {
416 unlink_method();
417 if (method_data() != nullptr) {
418 method_data()->remove_unshareable_info();
419 }
420 if (method_counters() != nullptr) {
421 method_counters()->remove_unshareable_info();
422 }
423 JFR_ONLY(REMOVE_METHOD_ID(this);)
424 }
425
426 void Method::restore_unshareable_info(TRAPS) {
427 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
428 if (method_data() != nullptr) {
429 method_data()->restore_unshareable_info(CHECK);
430 }
431 if (method_counters() != nullptr) {
432 method_counters()->restore_unshareable_info(CHECK);
433 }
434 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
435 assert(!pending_queue_processed(), "method's pending_queued_processed flag should not be set");
436 }
437 #endif
438
439 void Method::set_vtable_index(int index) {
440 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
441 // At runtime initialize_vtable is rerun as part of link_class_impl()
442 // for a shared class loaded by the non-boot loader to obtain the loader
443 // constraints based on the runtime classloaders' context.
444 return; // don't write into the shared class
445 } else {
446 _vtable_index = index;
447 }
448 }
449
450 void Method::set_itable_index(int index) {
451 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
452 // At runtime initialize_itable is rerun as part of link_class_impl()
453 // for a shared class loaded by the non-boot loader to obtain the loader
454 // constraints based on the runtime classloaders' context. The dumptime
455 // itable index should be the same as the runtime index.
456 assert(_vtable_index == itable_index_max - index,
457 "archived itable index is different from runtime index");
458 return; // don’t write into the shared class
459 } else {
460 _vtable_index = itable_index_max - index;
461 }
462 assert(valid_itable_index(), "");
463 }
464
465 // The RegisterNatives call being attempted tried to register with a method that
466 // is not native. Ask JVM TI what prefixes have been specified. Then check
467 // to see if the native method is now wrapped with the prefixes. See the
468 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
469 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
470 #if INCLUDE_JVMTI
471 ResourceMark rm(THREAD);
472 Method* method;
473 int name_len = name->utf8_length();
474 char* name_str = name->as_utf8();
475 int prefix_count;
476 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
477 for (int i = 0; i < prefix_count; i++) {
478 char* prefix = prefixes[i];
479 int prefix_len = (int)strlen(prefix);
480
481 // try adding this prefix to the method name and see if it matches another method name
482 int trial_len = name_len + prefix_len;
483 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
484 strcpy(trial_name_str, prefix);
485 strcat(trial_name_str, name_str);
486 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
487 if (trial_name == nullptr) {
488 continue; // no such symbol, so this prefix wasn't used, try the next prefix
489 }
490 method = k->lookup_method(trial_name, signature);
491 if (method == nullptr) {
492 continue; // signature doesn't match, try the next prefix
493 }
494 if (method->is_native()) {
495 method->set_is_prefixed_native();
496 return method; // wahoo, we found a prefixed version of the method, return it
497 }
498 // found as non-native, so prefix is good, add it, probably just need more prefixes
499 name_len = trial_len;
500 name_str = trial_name_str;
501 }
502 #endif // INCLUDE_JVMTI
503 return nullptr; // not found
504 }
505
506 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
507 Method* method = k->lookup_method(name, signature);
508 if (method == nullptr) {
509 ResourceMark rm(THREAD);
510 stringStream st;
511 st.print("Method '");
512 print_external_name(&st, k, name, signature);
513 st.print("' name or signature does not match");
514 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
515 }
516 if (!method->is_native()) {
517 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
518 method = find_prefixed_native(k, name, signature, THREAD);
519 if (method == nullptr) {
520 ResourceMark rm(THREAD);
521 stringStream st;
522 st.print("Method '");
523 print_external_name(&st, k, name, signature);
524 st.print("' is not declared as native");
525 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
526 }
527 }
528
529 if (entry != nullptr) {
530 method->set_native_function(entry, native_bind_event_is_interesting);
531 } else {
532 method->clear_native_function();
533 }
534 if (log_is_enabled(Debug, jni, resolve)) {
535 ResourceMark rm(THREAD);
536 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
537 method->method_holder()->external_name(),
538 method->name()->as_C_string());
539 }
540 return true;
541 }
542
543 bool Method::was_executed_more_than(int n) {
544 // Invocation counter is reset when the Method* is compiled.
545 // If the method has compiled code we therefore assume it has
546 // be executed more than n times.
547 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
548 // interpreter doesn't bump invocation counter of trivial methods
549 // compiler does not bump invocation counter of compiled methods
550 return true;
551 }
552 else if ((method_counters() != nullptr &&
553 method_counters()->invocation_counter()->carry()) ||
554 (method_data() != nullptr &&
555 method_data()->invocation_counter()->carry())) {
556 // The carry bit is set when the counter overflows and causes
557 // a compilation to occur. We don't know how many times
558 // the counter has been reset, so we simply assume it has
559 // been executed more than n times.
560 return true;
561 } else {
562 return invocation_count() > n;
563 }
564 }
565
566 void Method::print_invocation_count(outputStream* st) {
567 //---< compose+print method return type, klass, name, and signature >---
568 if (is_static()) { st->print("static "); }
569 if (is_final()) { st->print("final "); }
570 if (is_synchronized()) { st->print("synchronized "); }
571 if (is_native()) { st->print("native "); }
572 st->print("%s::", method_holder()->external_name());
573 name()->print_symbol_on(st);
574 signature()->print_symbol_on(st);
575
576 if (WizardMode) {
577 // dump the size of the byte codes
578 st->print(" {%d}", code_size());
579 }
580 st->cr();
581
582 // Counting based on signed int counters tends to overflow with
583 // longer-running workloads on fast machines. The counters under
584 // consideration here, however, are limited in range by counting
585 // logic. See InvocationCounter:count_limit for example.
586 // No "overflow precautions" need to be implemented here.
587 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
588 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
589 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
590
591 if (method_data() != nullptr) {
592 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
593 }
594
595 #ifndef PRODUCT
596 if (CountCompiledCalls) {
597 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
598 }
599 #endif
600 }
601
602 MethodTrainingData* Method::training_data_or_null() const {
603 MethodCounters* mcs = method_counters();
604 if (mcs == nullptr) {
605 return nullptr;
606 } else {
607 return mcs->method_training_data();
608 }
609 }
610
611 bool Method::init_training_data(MethodTrainingData* tdata) {
612 MethodCounters* mcs = method_counters();
613 if (mcs == nullptr) {
614 return false;
615 } else {
616 return mcs->init_method_training_data(tdata);
617 }
618 }
619
620 bool Method::install_training_method_data(const methodHandle& method) {
621 MethodTrainingData* mtd = MethodTrainingData::find(method);
622 if (mtd != nullptr && mtd->has_holder() && mtd->final_profile() != nullptr &&
623 mtd->holder() == method() && mtd->final_profile()->method() == method()) { // FIXME
624 Atomic::replace_if_null(&method->_method_data, mtd->final_profile());
625 return true;
626 }
627 return false;
628 }
629
630 // Build a MethodData* object to hold profiling information collected on this
631 // method when requested.
632 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
633 if (install_training_method_data(method)) {
634 return;
635 }
636 // Do not profile the method if metaspace has hit an OOM previously
637 // allocating profiling data. Callers clear pending exception so don't
638 // add one here.
639 if (ClassLoaderDataGraph::has_metaspace_oom()) {
640 return;
641 }
642
643 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
644 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
645 if (HAS_PENDING_EXCEPTION) {
646 CompileBroker::log_metaspace_failure();
647 ClassLoaderDataGraph::set_metaspace_oom(true);
648 return; // return the exception (which is cleared)
649 }
650
651 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
652 MetadataFactory::free_metadata(loader_data, method_data);
653 return;
654 }
655
656 /*
657 LogStreamHandle(Info, mdo) lsh;
658 if (lsh.is_enabled()) {
659 ResourceMark rm(THREAD);
660 lsh.print("build_profiling_method_data for ");
661 method->print_name(&lsh);
662 lsh.cr();
663 }
664 */
665 if (ForceProfiling && TrainingData::need_data()) {
666 MethodTrainingData* mtd = MethodTrainingData::make(method, false);
667 guarantee(mtd != nullptr, "");
668 }
669 if (PrintMethodData) {
670 ResourceMark rm(THREAD);
671 tty->print("build_profiling_method_data for ");
672 method->print_name(tty);
673 tty->cr();
674 // At the end of the run, the MDO, full of data, will be dumped.
675 }
676 }
677
678 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
679 // Do not profile the method if metaspace has hit an OOM previously
680 if (ClassLoaderDataGraph::has_metaspace_oom()) {
681 return nullptr;
682 }
683
684 methodHandle mh(current, m);
685 MethodCounters* counters;
686 if (current->is_Java_thread()) {
687 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
688 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
689 // if needed.
690 counters = MethodCounters::allocate_with_exception(mh, THREAD);
691 if (HAS_PENDING_EXCEPTION) {
692 CLEAR_PENDING_EXCEPTION;
693 }
694 } else {
695 // Call metaspace allocation that doesn't throw exception if the
696 // current thread isn't a JavaThread, ie. the VMThread.
697 counters = MethodCounters::allocate_no_exception(mh);
698 }
699
700 if (counters == nullptr) {
701 CompileBroker::log_metaspace_failure();
702 ClassLoaderDataGraph::set_metaspace_oom(true);
703 return nullptr;
704 }
705
706 if (!mh->init_method_counters(counters)) {
707 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
708 }
709
710 if (ForceProfiling && TrainingData::need_data()) {
711 MethodTrainingData* mtd = MethodTrainingData::make(mh, false);
712 guarantee(mtd != nullptr, "");
713 }
714
715 return mh->method_counters();
716 }
717
718 bool Method::init_method_counters(MethodCounters* counters) {
719 // Try to install a pointer to MethodCounters, return true on success.
720 return Atomic::replace_if_null(&_method_counters, counters);
721 }
722
723 void Method::set_exception_handler_entered(int handler_bci) {
724 if (ProfileExceptionHandlers) {
725 MethodData* mdo = method_data();
726 if (mdo != nullptr) {
727 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
728 handler_data.set_exception_handler_entered();
729 }
730 }
731 }
732
733 int Method::extra_stack_words() {
734 // not an inline function, to avoid a header dependency on Interpreter
735 return extra_stack_entries() * Interpreter::stackElementSize;
736 }
737
738 bool Method::is_vanilla_constructor() const {
739 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
740 // which only calls the superclass vanilla constructor and possibly does stores of
741 // zero constants to local fields:
742 //
743 // aload_0
744 // invokespecial
745 // indexbyte1
746 // indexbyte2
747 //
748 // followed by an (optional) sequence of:
749 //
750 // aload_0
751 // aconst_null / iconst_0 / fconst_0 / dconst_0
752 // putfield
753 // indexbyte1
754 // indexbyte2
755 //
756 // followed by:
757 //
758 // return
759
760 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
761 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
762 int size = code_size();
763 // Check if size match
764 if (size == 0 || size % 5 != 0) return false;
765 address cb = code_base();
766 int last = size - 1;
767 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
768 // Does not call superclass default constructor
769 return false;
770 }
771 // Check optional sequence
772 for (int i = 4; i < last; i += 5) {
773 if (cb[i] != Bytecodes::_aload_0) return false;
774 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
775 if (cb[i+2] != Bytecodes::_putfield) return false;
776 }
777 return true;
778 }
779
780
781 bool Method::compute_has_loops_flag() {
782 BytecodeStream bcs(methodHandle(Thread::current(), this));
783 Bytecodes::Code bc;
784
785 while ((bc = bcs.next()) >= 0) {
786 switch (bc) {
787 case Bytecodes::_ifeq:
788 case Bytecodes::_ifnull:
789 case Bytecodes::_iflt:
790 case Bytecodes::_ifle:
791 case Bytecodes::_ifne:
792 case Bytecodes::_ifnonnull:
793 case Bytecodes::_ifgt:
794 case Bytecodes::_ifge:
795 case Bytecodes::_if_icmpeq:
796 case Bytecodes::_if_icmpne:
797 case Bytecodes::_if_icmplt:
798 case Bytecodes::_if_icmpgt:
799 case Bytecodes::_if_icmple:
800 case Bytecodes::_if_icmpge:
801 case Bytecodes::_if_acmpeq:
802 case Bytecodes::_if_acmpne:
803 case Bytecodes::_goto:
804 case Bytecodes::_jsr:
805 if (bcs.dest() < bcs.next_bci()) {
806 return set_has_loops();
807 }
808 break;
809
810 case Bytecodes::_goto_w:
811 case Bytecodes::_jsr_w:
812 if (bcs.dest_w() < bcs.next_bci()) {
813 return set_has_loops();
814 }
815 break;
816
817 case Bytecodes::_lookupswitch: {
818 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
819 if (lookupswitch.default_offset() < 0) {
820 return set_has_loops();
821 } else {
822 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
823 LookupswitchPair pair = lookupswitch.pair_at(i);
824 if (pair.offset() < 0) {
825 return set_has_loops();
826 }
827 }
828 }
829 break;
830 }
831 case Bytecodes::_tableswitch: {
832 Bytecode_tableswitch tableswitch(this, bcs.bcp());
833 if (tableswitch.default_offset() < 0) {
834 return set_has_loops();
835 } else {
836 for (int i = 0; i < tableswitch.length(); ++i) {
837 if (tableswitch.dest_offset_at(i) < 0) {
838 return set_has_loops();
839 }
840 }
841 }
842 break;
843 }
844 default:
845 break;
846 }
847 }
848
849 _flags.set_has_loops_flag_init(true);
850 return false;
851 }
852
853 bool Method::is_final_method(AccessFlags class_access_flags) const {
854 // or "does_not_require_vtable_entry"
855 // default method or overpass can occur, is not final (reuses vtable entry)
856 // private methods in classes get vtable entries for backward class compatibility.
857 if (is_overpass() || is_default_method()) return false;
858 return is_final() || class_access_flags.is_final();
859 }
860
861 bool Method::is_final_method() const {
862 return is_final_method(method_holder()->access_flags());
863 }
864
865 bool Method::is_default_method() const {
866 if (method_holder() != nullptr &&
867 method_holder()->is_interface() &&
868 !is_abstract() && !is_private()) {
869 return true;
870 } else {
871 return false;
872 }
873 }
874
875 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
876 if (is_final_method(class_access_flags)) return true;
877 #ifdef ASSERT
878 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
879 if (class_access_flags.is_interface()) {
880 ResourceMark rm;
881 assert(is_nonv == is_static() || is_nonv == is_private(),
882 "nonvirtual unexpected for non-static, non-private: %s",
883 name_and_sig_as_C_string());
884 }
885 #endif
886 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
887 return vtable_index() == nonvirtual_vtable_index;
888 }
889
890 bool Method::can_be_statically_bound() const {
891 return can_be_statically_bound(method_holder()->access_flags());
892 }
893
894 bool Method::can_be_statically_bound(InstanceKlass* context) const {
895 return (method_holder() == context) && can_be_statically_bound();
896 }
897
898 /**
899 * Returns false if this is one of specially treated methods for
900 * which we have to provide stack trace in throw in compiled code.
901 * Returns true otherwise.
902 */
903 bool Method::can_omit_stack_trace() {
904 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
905 return false; // All methods in sun.invoke.util.ValueConversions
906 }
907 return true;
908 }
909
910 bool Method::is_accessor() const {
911 return is_getter() || is_setter();
912 }
913
914 bool Method::is_getter() const {
915 if (code_size() != 5) return false;
916 if (size_of_parameters() != 1) return false;
917 if (java_code_at(0) != Bytecodes::_aload_0) return false;
918 if (java_code_at(1) != Bytecodes::_getfield) return false;
919 switch (java_code_at(4)) {
920 case Bytecodes::_ireturn:
921 case Bytecodes::_lreturn:
922 case Bytecodes::_freturn:
923 case Bytecodes::_dreturn:
924 case Bytecodes::_areturn:
925 break;
926 default:
927 return false;
928 }
929 return true;
930 }
931
932 bool Method::is_setter() const {
933 if (code_size() != 6) return false;
934 if (java_code_at(0) != Bytecodes::_aload_0) return false;
935 switch (java_code_at(1)) {
936 case Bytecodes::_iload_1:
937 case Bytecodes::_aload_1:
938 case Bytecodes::_fload_1:
939 if (size_of_parameters() != 2) return false;
940 break;
941 case Bytecodes::_dload_1:
942 case Bytecodes::_lload_1:
943 if (size_of_parameters() != 3) return false;
944 break;
945 default:
946 return false;
947 }
948 if (java_code_at(2) != Bytecodes::_putfield) return false;
949 if (java_code_at(5) != Bytecodes::_return) return false;
950 return true;
951 }
952
953 bool Method::is_constant_getter() const {
954 int last_index = code_size() - 1;
955 // Check if the first 1-3 bytecodes are a constant push
956 // and the last bytecode is a return.
957 return (2 <= code_size() && code_size() <= 4 &&
958 Bytecodes::is_const(java_code_at(0)) &&
959 Bytecodes::length_for(java_code_at(0)) == last_index &&
960 Bytecodes::is_return(java_code_at(last_index)));
961 }
962
963 bool Method::is_initializer() const {
964 return is_object_initializer() || is_static_initializer();
965 }
966
967 bool Method::has_valid_initializer_flags() const {
968 return (is_static() ||
969 method_holder()->major_version() < 51);
970 }
971
972 bool Method::is_static_initializer() const {
973 // For classfiles version 51 or greater, ensure that the clinit method is
974 // static. Non-static methods with the name "<clinit>" are not static
975 // initializers. (older classfiles exempted for backward compatibility)
976 return name() == vmSymbols::class_initializer_name() &&
977 has_valid_initializer_flags();
978 }
979
980 bool Method::is_object_initializer() const {
981 return name() == vmSymbols::object_initializer_name();
982 }
983
984 bool Method::needs_clinit_barrier() const {
985 return is_static() && !method_holder()->is_initialized();
986 }
987
988 bool Method::code_has_clinit_barriers() const {
989 nmethod* nm = code();
990 return (nm != nullptr) && nm->has_clinit_barriers();
991 }
992
993 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
994 int length = method->checked_exceptions_length();
995 if (length == 0) { // common case
996 return objArrayHandle(THREAD, Universe::the_empty_class_array());
997 } else {
998 methodHandle h_this(THREAD, method);
999 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
1000 objArrayHandle mirrors (THREAD, m_oop);
1001 for (int i = 0; i < length; i++) {
1002 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
1003 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
1004 if (log_is_enabled(Warning, exceptions) &&
1005 !k->is_subclass_of(vmClasses::Throwable_klass())) {
1006 ResourceMark rm(THREAD);
1007 log_warning(exceptions)(
1008 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
1009 k->external_name(), method->external_name());
1010 }
1011 mirrors->obj_at_put(i, k->java_mirror());
1012 }
1013 return mirrors;
1014 }
1015 };
1016
1017
1018 int Method::line_number_from_bci(int bci) const {
1019 int best_bci = 0;
1020 int best_line = -1;
1021 if (bci == SynchronizationEntryBCI) bci = 0;
1022 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
1023 // The line numbers are a short array of 2-tuples [start_pc, line_number].
1024 // Not necessarily sorted and not necessarily one-to-one.
1025 CompressedLineNumberReadStream stream(compressed_linenumber_table());
1026 while (stream.read_pair()) {
1027 if (stream.bci() == bci) {
1028 // perfect match
1029 return stream.line();
1030 } else {
1031 // update best_bci/line
1032 if (stream.bci() < bci && stream.bci() >= best_bci) {
1033 best_bci = stream.bci();
1034 best_line = stream.line();
1035 }
1036 }
1037 }
1038 }
1039 return best_line;
1040 }
1041
1042
1043 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1044 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
1045 Thread *thread = Thread::current();
1046 Symbol* klass_name = constants()->klass_name_at(klass_index);
1047 Handle loader(thread, method_holder()->class_loader());
1048 Handle prot (thread, method_holder()->protection_domain());
1049 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != nullptr;
1050 } else {
1051 return true;
1052 }
1053 }
1054
1055
1056 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1057 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1058 if (must_be_resolved) {
1059 // Make sure klass is resolved in constantpool.
1060 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
1061 }
1062 return is_klass_loaded_by_klass_index(klass_index);
1063 }
1064
1065
1066 void Method::set_native_function(address function, bool post_event_flag) {
1067 assert(function != nullptr, "use clear_native_function to unregister natives");
1068 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1069 address* native_function = native_function_addr();
1070
1071 // We can see racers trying to place the same native function into place. Once
1072 // is plenty.
1073 address current = *native_function;
1074 if (current == function) return;
1075 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1076 function != nullptr) {
1077 // native_method_throw_unsatisfied_link_error_entry() should only
1078 // be passed when post_event_flag is false.
1079 assert(function !=
1080 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1081 "post_event_flag mismatch");
1082
1083 // post the bind event, and possible change the bind function
1084 JvmtiExport::post_native_method_bind(this, &function);
1085 }
1086 *native_function = function;
1087 // This function can be called more than once. We must make sure that we always
1088 // use the latest registered method -> check if a stub already has been generated.
1089 // If so, we have to make it not_entrant.
1090 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1091 if (nm != nullptr) {
1092 nm->make_not_entrant();
1093 }
1094 }
1095
1096
1097 bool Method::has_native_function() const {
1098 if (is_special_native_intrinsic())
1099 return false; // special-cased in SharedRuntime::generate_native_wrapper
1100 address func = native_function();
1101 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1102 }
1103
1104
1105 void Method::clear_native_function() {
1106 // Note: is_method_handle_intrinsic() is allowed here.
1107 set_native_function(
1108 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1109 !native_bind_event_is_interesting);
1110 this->unlink_code();
1111 }
1112
1113
1114 void Method::set_signature_handler(address handler) {
1115 address* signature_handler = signature_handler_addr();
1116 *signature_handler = handler;
1117 }
1118
1119
1120 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1121 assert(reason != nullptr, "must provide a reason");
1122 if (PrintCompilation && report) {
1123 ttyLocker ttyl;
1124 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1125 if (comp_level == CompLevel_all) {
1126 tty->print("all levels ");
1127 } else {
1128 tty->print("level %d ", comp_level);
1129 }
1130 this->print_short_name(tty);
1131 int size = this->code_size();
1132 if (size > 0) {
1133 tty->print(" (%d bytes)", size);
1134 }
1135 if (reason != nullptr) {
1136 tty->print(" %s", reason);
1137 }
1138 tty->cr();
1139 }
1140 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1141 ttyLocker ttyl;
1142 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
1143 os::current_thread_id(), is_osr, comp_level);
1144 if (reason != nullptr) {
1145 xtty->print(" reason=\'%s\'", reason);
1146 }
1147 xtty->method(this);
1148 xtty->stamp();
1149 xtty->end_elem();
1150 }
1151 }
1152
1153 bool Method::is_always_compilable() const {
1154 // Generated adapters must be compiled
1155 if (is_special_native_intrinsic() && is_synthetic()) {
1156 assert(!is_not_c1_compilable(), "sanity check");
1157 assert(!is_not_c2_compilable(), "sanity check");
1158 return true;
1159 }
1160
1161 return false;
1162 }
1163
1164 bool Method::is_not_compilable(int comp_level) const {
1165 if (number_of_breakpoints() > 0)
1166 return true;
1167 if (is_always_compilable())
1168 return false;
1169 if (comp_level == CompLevel_any)
1170 return is_not_c1_compilable() && is_not_c2_compilable();
1171 if (is_c1_compile(comp_level))
1172 return is_not_c1_compilable();
1173 if (is_c2_compile(comp_level))
1174 return is_not_c2_compilable();
1175 return false;
1176 }
1177
1178 // call this when compiler finds that this method is not compilable
1179 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1180 if (is_always_compilable()) {
1181 // Don't mark a method which should be always compilable
1182 return;
1183 }
1184 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1185 if (comp_level == CompLevel_all) {
1186 set_is_not_c1_compilable();
1187 set_is_not_c2_compilable();
1188 } else {
1189 if (is_c1_compile(comp_level))
1190 set_is_not_c1_compilable();
1191 if (is_c2_compile(comp_level))
1192 set_is_not_c2_compilable();
1193 }
1194 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1195 }
1196
1197 bool Method::is_not_osr_compilable(int comp_level) const {
1198 if (is_not_compilable(comp_level))
1199 return true;
1200 if (comp_level == CompLevel_any)
1201 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1202 if (is_c1_compile(comp_level))
1203 return is_not_c1_osr_compilable();
1204 if (is_c2_compile(comp_level))
1205 return is_not_c2_osr_compilable();
1206 return false;
1207 }
1208
1209 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1210 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1211 if (comp_level == CompLevel_all) {
1212 set_is_not_c1_osr_compilable();
1213 set_is_not_c2_osr_compilable();
1214 } else {
1215 if (is_c1_compile(comp_level))
1216 set_is_not_c1_osr_compilable();
1217 if (is_c2_compile(comp_level))
1218 set_is_not_c2_osr_compilable();
1219 }
1220 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1221 }
1222
1223 // Revert to using the interpreter and clear out the nmethod
1224 void Method::clear_code() {
1225 // this may be null if c2i adapters have not been made yet
1226 // Only should happen at allocate time.
1227 if (adapter() == nullptr) {
1228 _from_compiled_entry = nullptr;
1229 } else {
1230 _from_compiled_entry = adapter()->get_c2i_entry();
1231 }
1232 OrderAccess::storestore();
1233 _from_interpreted_entry = _i2i_entry;
1234 OrderAccess::storestore();
1235 _code = nullptr;
1236 }
1237
1238 void Method::unlink_code(nmethod *compare) {
1239 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1240 // We need to check if either the _code or _from_compiled_code_entry_point
1241 // refer to this nmethod because there is a race in setting these two fields
1242 // in Method* as seen in bugid 4947125.
1243 if (code() == compare ||
1244 from_compiled_entry() == compare->verified_entry_point()) {
1245 clear_code();
1246 }
1247 }
1248
1249 void Method::unlink_code() {
1250 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1251 clear_code();
1252 }
1253
1254 #if INCLUDE_CDS
1255 // Called by class data sharing to remove any entry points (which are not shared)
1256 void Method::unlink_method() {
1257 assert(CDSConfig::is_dumping_archive(), "sanity");
1258 _code = nullptr;
1259 _adapter = nullptr;
1260 _i2i_entry = nullptr;
1261 _from_compiled_entry = nullptr;
1262 _from_interpreted_entry = nullptr;
1263
1264 if (is_native()) {
1265 *native_function_addr() = nullptr;
1266 set_signature_handler(nullptr);
1267 }
1268 NOT_PRODUCT(set_compiled_invocation_count(0);)
1269
1270 clear_method_data();
1271 clear_method_counters();
1272 clear_is_not_c1_compilable();
1273 clear_is_not_c1_osr_compilable();
1274 clear_is_not_c2_compilable();
1275 clear_is_not_c2_osr_compilable();
1276 clear_queued_for_compilation();
1277 set_pending_queue_processed(false);
1278 remove_unshareable_flags();
1279 }
1280
1281 void Method::remove_unshareable_flags() {
1282 // clear all the flags that shouldn't be in the archived version
1283 assert(!is_old(), "must be");
1284 assert(!is_obsolete(), "must be");
1285 assert(!is_deleted(), "must be");
1286
1287 set_is_prefixed_native(false);
1288 set_queued_for_compilation(false);
1289 set_pending_queue_processed(false);
1290 set_is_not_c2_compilable(false);
1291 set_is_not_c1_compilable(false);
1292 set_is_not_c2_osr_compilable(false);
1293 set_on_stack_flag(false);
1294 }
1295 #endif
1296
1297 // Called when the method_holder is getting linked. Setup entrypoints so the method
1298 // is ready to be called from interpreter, compiler, and vtables.
1299 void Method::link_method(const methodHandle& h_method, TRAPS) {
1300 if (UsePerfData) {
1301 ClassLoader::perf_ik_link_methods_count()->inc();
1302 }
1303
1304 // If the code cache is full, we may reenter this function for the
1305 // leftover methods that weren't linked.
1306 if (adapter() != nullptr) {
1307 return;
1308 }
1309 assert( _code == nullptr, "nothing compiled yet" );
1310
1311 // Setup interpreter entrypoint
1312 assert(this == h_method(), "wrong h_method()" );
1313
1314 assert(adapter() == nullptr, "init'd to null");
1315 address entry = Interpreter::entry_for_method(h_method);
1316 assert(entry != nullptr, "interpreter entry must be non-null");
1317 // Sets both _i2i_entry and _from_interpreted_entry
1318 set_interpreter_entry(entry);
1319
1320 // Don't overwrite already registered native entries.
1321 if (is_native() && !has_native_function()) {
1322 set_native_function(
1323 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1324 !native_bind_event_is_interesting);
1325 }
1326
1327 // Setup compiler entrypoint. This is made eagerly, so we do not need
1328 // special handling of vtables. An alternative is to make adapters more
1329 // lazily by calling make_adapter() from from_compiled_entry() for the
1330 // normal calls. For vtable calls life gets more complicated. When a
1331 // call-site goes mega-morphic we need adapters in all methods which can be
1332 // called from the vtable. We need adapters on such methods that get loaded
1333 // later. Ditto for mega-morphic itable calls. If this proves to be a
1334 // problem we'll make these lazily later.
1335 (void) make_adapters(h_method, CHECK);
1336
1337 // ONLY USE the h_method now as make_adapter may have blocked
1338
1339 if (h_method->is_continuation_native_intrinsic()) {
1340 _from_interpreted_entry = nullptr;
1341 _from_compiled_entry = nullptr;
1342 _i2i_entry = nullptr;
1343 if (Continuations::enabled()) {
1344 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1345 AdapterHandlerLibrary::create_native_wrapper(h_method);
1346 if (!h_method->has_compiled_code()) {
1347 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1348 }
1349 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1350 }
1351 }
1352 if (_preload_code != nullptr) {
1353 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1354 set_code(h_method, _preload_code);
1355 assert(((nmethod*)_preload_code)->scc_entry() == _scc_entry, "sanity");
1356 }
1357 }
1358
1359 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1360 PerfTraceElapsedTime timer(ClassLoader::perf_method_adapters_time());
1361
1362 // Adapters for compiled code are made eagerly here. They are fairly
1363 // small (generally < 100 bytes) and quick to make (and cached and shared)
1364 // so making them eagerly shouldn't be too expensive.
1365 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1366 if (adapter == nullptr ) {
1367 if (!is_init_completed()) {
1368 // Don't throw exceptions during VM initialization because java.lang.* classes
1369 // might not have been initialized, causing problems when constructing the
1370 // Java exception object.
1371 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1372 } else {
1373 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1374 }
1375 }
1376
1377 mh->set_adapter_entry(adapter);
1378 mh->_from_compiled_entry = adapter->get_c2i_entry();
1379 return adapter->get_c2i_entry();
1380 }
1381
1382 // The verified_code_entry() must be called when a invoke is resolved
1383 // on this method.
1384
1385 // It returns the compiled code entry point, after asserting not null.
1386 // This function is called after potential safepoints so that nmethod
1387 // or adapter that it points to is still live and valid.
1388 // This function must not hit a safepoint!
1389 address Method::verified_code_entry() {
1390 debug_only(NoSafepointVerifier nsv;)
1391 assert(_from_compiled_entry != nullptr, "must be set");
1392 return _from_compiled_entry;
1393 }
1394
1395 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1396 // (could be racing a deopt).
1397 // Not inline to avoid circular ref.
1398 bool Method::check_code() const {
1399 // cached in a register or local. There's a race on the value of the field.
1400 nmethod *code = Atomic::load_acquire(&_code);
1401 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1402 }
1403
1404 // Install compiled code. Instantly it can execute.
1405 void Method::set_code(const methodHandle& mh, nmethod *code) {
1406 assert_lock_strong(NMethodState_lock);
1407 assert( code, "use clear_code to remove code" );
1408 assert( mh->check_code(), "" );
1409
1410 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1411
1412 // These writes must happen in this order, because the interpreter will
1413 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1414 // which jumps to _from_compiled_entry.
1415 mh->_code = code; // Assign before allowing compiled code to exec
1416
1417 int comp_level = code->comp_level();
1418 // In theory there could be a race here. In practice it is unlikely
1419 // and not worth worrying about.
1420 if (comp_level > mh->highest_comp_level()) {
1421 mh->set_highest_comp_level(comp_level);
1422 }
1423
1424 OrderAccess::storestore();
1425 mh->_from_compiled_entry = code->verified_entry_point();
1426 OrderAccess::storestore();
1427
1428 if (mh->is_continuation_native_intrinsic()) {
1429 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1430
1431 if (mh->is_continuation_enter_intrinsic()) {
1432 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1433 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1434 } else if (mh->is_continuation_yield_intrinsic()) {
1435 mh->_i2i_entry = mh->get_i2c_entry();
1436 } else {
1437 guarantee(false, "Unknown Continuation native intrinsic");
1438 }
1439 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1440 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1441 } else if (!mh->is_method_handle_intrinsic()) {
1442 // Instantly compiled code can execute.
1443 mh->_from_interpreted_entry = mh->get_i2c_entry();
1444 }
1445 }
1446
1447
1448 bool Method::is_overridden_in(Klass* k) const {
1449 InstanceKlass* ik = InstanceKlass::cast(k);
1450
1451 if (ik->is_interface()) return false;
1452
1453 // If method is an interface, we skip it - except if it
1454 // is a miranda method
1455 if (method_holder()->is_interface()) {
1456 // Check that method is not a miranda method
1457 if (ik->lookup_method(name(), signature()) == nullptr) {
1458 // No implementation exist - so miranda method
1459 return false;
1460 }
1461 return true;
1462 }
1463
1464 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1465 if (!has_vtable_index()) {
1466 return false;
1467 } else {
1468 Method* vt_m = ik->method_at_vtable(vtable_index());
1469 return vt_m != this;
1470 }
1471 }
1472
1473
1474 // give advice about whether this Method* should be cached or not
1475 bool Method::should_not_be_cached() const {
1476 if (is_old()) {
1477 // This method has been redefined. It is either EMCP or obsolete
1478 // and we don't want to cache it because that would pin the method
1479 // down and prevent it from being collectible if and when it
1480 // finishes executing.
1481 return true;
1482 }
1483
1484 // caching this method should be just fine
1485 return false;
1486 }
1487
1488
1489 /**
1490 * Returns true if this is one of the specially treated methods for
1491 * security related stack walks (like Reflection.getCallerClass).
1492 */
1493 bool Method::is_ignored_by_security_stack_walk() const {
1494 if (intrinsic_id() == vmIntrinsics::_invoke) {
1495 // This is Method.invoke() -- ignore it
1496 return true;
1497 }
1498 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1499 // This is an auxiliary frame -- ignore it
1500 return true;
1501 }
1502 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1503 // This is an internal adapter frame for method handles -- ignore it
1504 return true;
1505 }
1506 return false;
1507 }
1508
1509
1510 // Constant pool structure for invoke methods:
1511 enum {
1512 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1513 _imcp_invoke_signature, // utf8: (variable Symbol*)
1514 _imcp_limit
1515 };
1516
1517 // Test if this method is an MH adapter frame generated by Java code.
1518 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1519 bool Method::is_compiled_lambda_form() const {
1520 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1521 }
1522
1523 // Test if this method is an internal MH primitive method.
1524 bool Method::is_method_handle_intrinsic() const {
1525 vmIntrinsics::ID iid = intrinsic_id();
1526 return (MethodHandles::is_signature_polymorphic(iid) &&
1527 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1528 }
1529
1530 bool Method::has_member_arg() const {
1531 vmIntrinsics::ID iid = intrinsic_id();
1532 return (MethodHandles::is_signature_polymorphic(iid) &&
1533 MethodHandles::has_member_arg(iid));
1534 }
1535
1536 // Make an instance of a signature-polymorphic internal MH primitive.
1537 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1538 Symbol* signature,
1539 TRAPS) {
1540 ResourceMark rm(THREAD);
1541 methodHandle empty;
1542
1543 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1544 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1545 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1546
1547 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1548
1549 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1550 name->increment_refcount();
1551 signature->increment_refcount();
1552
1553 int cp_length = _imcp_limit;
1554 ClassLoaderData* loader_data = holder->class_loader_data();
1555 constantPoolHandle cp;
1556 {
1557 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1558 cp = constantPoolHandle(THREAD, cp_oop);
1559 }
1560 cp->copy_fields(holder->constants());
1561 cp->set_pool_holder(holder);
1562 cp->symbol_at_put(_imcp_invoke_name, name);
1563 cp->symbol_at_put(_imcp_invoke_signature, signature);
1564 cp->set_has_preresolution();
1565 cp->set_is_for_method_handle_intrinsic();
1566
1567 // decide on access bits: public or not?
1568 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1569 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1570 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1571 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1572
1573 methodHandle m;
1574 {
1575 InlineTableSizes sizes;
1576 Method* m_oop = Method::allocate(loader_data, 0,
1577 accessFlags_from(flags_bits), &sizes,
1578 ConstMethod::NORMAL,
1579 name,
1580 CHECK_(empty));
1581 m = methodHandle(THREAD, m_oop);
1582 }
1583 m->set_constants(cp());
1584 m->set_name_index(_imcp_invoke_name);
1585 m->set_signature_index(_imcp_invoke_signature);
1586 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1587 assert(m->signature() == signature, "");
1588 m->constMethod()->compute_from_signature(signature, must_be_static);
1589 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1590 assert(m->is_method_handle_intrinsic(), "");
1591 #ifdef ASSERT
1592 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1593 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1594 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1595 #endif //ASSERT
1596
1597 // Finally, set up its entry points.
1598 assert(m->can_be_statically_bound(), "");
1599 m->set_vtable_index(Method::nonvirtual_vtable_index);
1600 m->link_method(m, CHECK_(empty));
1601
1602 if (iid == vmIntrinsics::_linkToNative) {
1603 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1604 }
1605 if (log_is_enabled(Debug, methodhandles)) {
1606 LogTarget(Debug, methodhandles) lt;
1607 LogStream ls(lt);
1608 m->print_on(&ls);
1609 }
1610
1611 return m;
1612 }
1613
1614 #if INCLUDE_CDS
1615 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1616 m->link_method(m, CHECK);
1617
1618 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1619 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1620 }
1621 }
1622 #endif
1623
1624 Klass* Method::check_non_bcp_klass(Klass* klass) {
1625 if (klass != nullptr && klass->class_loader() != nullptr) {
1626 if (klass->is_objArray_klass())
1627 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1628 return klass;
1629 }
1630 return nullptr;
1631 }
1632
1633
1634 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1635 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1636 // Code below does not work for native methods - they should never get rewritten anyway
1637 assert(!m->is_native(), "cannot rewrite native methods");
1638 // Allocate new Method*
1639 AccessFlags flags = m->access_flags();
1640
1641 ConstMethod* cm = m->constMethod();
1642 int checked_exceptions_len = cm->checked_exceptions_length();
1643 int localvariable_len = cm->localvariable_table_length();
1644 int exception_table_len = cm->exception_table_length();
1645 int method_parameters_len = cm->method_parameters_length();
1646 int method_annotations_len = cm->method_annotations_length();
1647 int parameter_annotations_len = cm->parameter_annotations_length();
1648 int type_annotations_len = cm->type_annotations_length();
1649 int default_annotations_len = cm->default_annotations_length();
1650
1651 InlineTableSizes sizes(
1652 localvariable_len,
1653 new_compressed_linenumber_size,
1654 exception_table_len,
1655 checked_exceptions_len,
1656 method_parameters_len,
1657 cm->generic_signature_index(),
1658 method_annotations_len,
1659 parameter_annotations_len,
1660 type_annotations_len,
1661 default_annotations_len,
1662 0);
1663
1664 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1665 Method* newm_oop = Method::allocate(loader_data,
1666 new_code_length,
1667 flags,
1668 &sizes,
1669 m->method_type(),
1670 m->name(),
1671 CHECK_(methodHandle()));
1672 methodHandle newm (THREAD, newm_oop);
1673
1674 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1675 ConstMethod* newcm = newm->constMethod();
1676 int new_const_method_size = newm->constMethod()->size();
1677
1678 // This works because the source and target are both Methods. Some compilers
1679 // (e.g., clang) complain that the target vtable pointer will be stomped,
1680 // so cast away newm()'s and m()'s Methodness.
1681 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1682
1683 // Create shallow copy of ConstMethod.
1684 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1685
1686 // Reset correct method/const method, method size, and parameter info
1687 newm->set_constMethod(newcm);
1688 newm->constMethod()->set_code_size(new_code_length);
1689 newm->constMethod()->set_constMethod_size(new_const_method_size);
1690 assert(newm->code_size() == new_code_length, "check");
1691 assert(newm->method_parameters_length() == method_parameters_len, "check");
1692 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1693 assert(newm->exception_table_length() == exception_table_len, "check");
1694 assert(newm->localvariable_table_length() == localvariable_len, "check");
1695 // Copy new byte codes
1696 memcpy(newm->code_base(), new_code, new_code_length);
1697 // Copy line number table
1698 if (new_compressed_linenumber_size > 0) {
1699 memcpy(newm->compressed_linenumber_table(),
1700 new_compressed_linenumber_table,
1701 new_compressed_linenumber_size);
1702 }
1703 // Copy method_parameters
1704 if (method_parameters_len > 0) {
1705 memcpy(newm->method_parameters_start(),
1706 m->method_parameters_start(),
1707 method_parameters_len * sizeof(MethodParametersElement));
1708 }
1709 // Copy checked_exceptions
1710 if (checked_exceptions_len > 0) {
1711 memcpy(newm->checked_exceptions_start(),
1712 m->checked_exceptions_start(),
1713 checked_exceptions_len * sizeof(CheckedExceptionElement));
1714 }
1715 // Copy exception table
1716 if (exception_table_len > 0) {
1717 memcpy(newm->exception_table_start(),
1718 m->exception_table_start(),
1719 exception_table_len * sizeof(ExceptionTableElement));
1720 }
1721 // Copy local variable number table
1722 if (localvariable_len > 0) {
1723 memcpy(newm->localvariable_table_start(),
1724 m->localvariable_table_start(),
1725 localvariable_len * sizeof(LocalVariableTableElement));
1726 }
1727 // Copy stackmap table
1728 if (m->has_stackmap_table()) {
1729 int code_attribute_length = m->stackmap_data()->length();
1730 Array<u1>* stackmap_data =
1731 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1732 memcpy((void*)stackmap_data->adr_at(0),
1733 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1734 newm->set_stackmap_data(stackmap_data);
1735 }
1736
1737 // copy annotations over to new method
1738 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1739 return newm;
1740 }
1741
1742 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1743 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1744 // because we are not loading from core libraries
1745 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1746 // which does not use the class default class loader so we check for its loader here
1747 const InstanceKlass* ik = InstanceKlass::cast(holder);
1748 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1749 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1750 }
1751
1752 // see if the klass name is well-known:
1753 Symbol* klass_name = ik->name();
1754 vmSymbolID id = vmSymbols::find_sid(klass_name);
1755 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1756 return id;
1757 } else {
1758 return vmSymbolID::NO_SID;
1759 }
1760 }
1761
1762 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1763 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1764 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1765 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1766 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1767
1768 // the klass name is well-known:
1769 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1770 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1771
1772 // ditto for method and signature:
1773 vmSymbolID name_id = vmSymbols::find_sid(name());
1774 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1775 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1776 && name_id == vmSymbolID::NO_SID) {
1777 return;
1778 }
1779 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1780 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1781 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1782 && sig_id == vmSymbolID::NO_SID) {
1783 return;
1784 }
1785 jshort flags = access_flags().as_short();
1786
1787 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1788 if (id != vmIntrinsics::_none) {
1789 set_intrinsic_id(id);
1790 if (id == vmIntrinsics::_Class_cast) {
1791 // Even if the intrinsic is rejected, we want to inline this simple method.
1792 set_force_inline();
1793 }
1794 return;
1795 }
1796
1797 // A few slightly irregular cases:
1798 switch (klass_id) {
1799 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1800 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1801 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1802 if (!is_native()) break;
1803 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1804 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1805 id = vmIntrinsics::_none;
1806 break;
1807
1808 default:
1809 break;
1810 }
1811
1812 if (id != vmIntrinsics::_none) {
1813 // Set up its iid. It is an alias method.
1814 set_intrinsic_id(id);
1815 return;
1816 }
1817 }
1818
1819 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1820 if (!THREAD->can_call_java()) {
1821 // There is nothing useful this routine can do from within the Compile thread.
1822 // Hopefully, the signature contains only well-known classes.
1823 // We could scan for this and return true/false, but the caller won't care.
1824 return false;
1825 }
1826 bool sig_is_loaded = true;
1827 ResourceMark rm(THREAD);
1828 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1829 if (ss.is_reference()) {
1830 // load everything, including arrays "[Lfoo;"
1831 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1832 // We are loading classes eagerly. If a ClassNotFoundException or
1833 // a LinkageError was generated, be sure to ignore it.
1834 if (HAS_PENDING_EXCEPTION) {
1835 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1836 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1837 CLEAR_PENDING_EXCEPTION;
1838 } else {
1839 return false;
1840 }
1841 }
1842 if( klass == nullptr) { sig_is_loaded = false; }
1843 }
1844 }
1845 return sig_is_loaded;
1846 }
1847
1848 // Exposed so field engineers can debug VM
1849 void Method::print_short_name(outputStream* st) const {
1850 ResourceMark rm;
1851 #ifdef PRODUCT
1852 st->print(" %s::", method_holder()->external_name());
1853 #else
1854 st->print(" %s::", method_holder()->internal_name());
1855 #endif
1856 name()->print_symbol_on(st);
1857 if (WizardMode) signature()->print_symbol_on(st);
1858 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1859 MethodHandles::print_as_basic_type_signature_on(st, signature());
1860 }
1861
1862 // Comparer for sorting an object array containing
1863 // Method*s.
1864 static int method_comparator(Method* a, Method* b) {
1865 return a->name()->fast_compare(b->name());
1866 }
1867
1868 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1869 // default_methods also uses this without the ordering for fast find_method
1870 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1871 int length = methods->length();
1872 if (length > 1) {
1873 if (func == nullptr) {
1874 func = method_comparator;
1875 }
1876 {
1877 NoSafepointVerifier nsv;
1878 QuickSort::sort(methods->data(), length, func, /*idempotent=*/false);
1879 }
1880 // Reset method ordering
1881 if (set_idnums) {
1882 for (u2 i = 0; i < length; i++) {
1883 Method* m = methods->at(i);
1884 m->set_method_idnum(i);
1885 m->set_orig_method_idnum(i);
1886 }
1887 }
1888 }
1889 }
1890
1891 //-----------------------------------------------------------------------------------
1892 // Non-product code unless JVM/TI needs it
1893
1894 #if !defined(PRODUCT) || INCLUDE_JVMTI
1895 class SignatureTypePrinter : public SignatureTypeNames {
1896 private:
1897 outputStream* _st;
1898 bool _use_separator;
1899
1900 void type_name(const char* name) {
1901 if (_use_separator) _st->print(", ");
1902 _st->print("%s", name);
1903 _use_separator = true;
1904 }
1905
1906 public:
1907 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1908 _st = st;
1909 _use_separator = false;
1910 }
1911
1912 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1913 void print_returntype() { _use_separator = false; do_type(return_type()); }
1914 };
1915
1916
1917 void Method::print_name(outputStream* st) const {
1918 Thread *thread = Thread::current();
1919 ResourceMark rm(thread);
1920 st->print("%s ", is_static() ? "static" : "virtual");
1921 if (WizardMode) {
1922 st->print("%s.", method_holder()->internal_name());
1923 name()->print_symbol_on(st);
1924 signature()->print_symbol_on(st);
1925 } else {
1926 SignatureTypePrinter sig(signature(), st);
1927 sig.print_returntype();
1928 st->print(" %s.", method_holder()->internal_name());
1929 name()->print_symbol_on(st);
1930 st->print("(");
1931 sig.print_parameters();
1932 st->print(")");
1933 }
1934 }
1935 #endif // !PRODUCT || INCLUDE_JVMTI
1936
1937
1938 void Method::print_codes_on(outputStream* st, int flags) const {
1939 print_codes_on(0, code_size(), st, flags);
1940 }
1941
1942 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1943 Thread *thread = Thread::current();
1944 ResourceMark rm(thread);
1945 methodHandle mh (thread, (Method*)this);
1946 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1947 }
1948
1949 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1950 _bci = 0;
1951 _line = 0;
1952 };
1953
1954 bool CompressedLineNumberReadStream::read_pair() {
1955 jubyte next = read_byte();
1956 // Check for terminator
1957 if (next == 0) return false;
1958 if (next == 0xFF) {
1959 // Escape character, regular compression used
1960 _bci += read_signed_int();
1961 _line += read_signed_int();
1962 } else {
1963 // Single byte compression used
1964 _bci += next >> 3;
1965 _line += next & 0x7;
1966 }
1967 return true;
1968 }
1969
1970 #if INCLUDE_JVMTI
1971
1972 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1973 BreakpointInfo* bp = method_holder()->breakpoints();
1974 for (; bp != nullptr; bp = bp->next()) {
1975 if (bp->match(this, bci)) {
1976 return bp->orig_bytecode();
1977 }
1978 }
1979 {
1980 ResourceMark rm;
1981 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1982 }
1983 return Bytecodes::_shouldnotreachhere;
1984 }
1985
1986 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1987 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1988 BreakpointInfo* bp = method_holder()->breakpoints();
1989 for (; bp != nullptr; bp = bp->next()) {
1990 if (bp->match(this, bci)) {
1991 bp->set_orig_bytecode(code);
1992 // and continue, in case there is more than one
1993 }
1994 }
1995 }
1996
1997 void Method::set_breakpoint(int bci) {
1998 InstanceKlass* ik = method_holder();
1999 BreakpointInfo *bp = new BreakpointInfo(this, bci);
2000 bp->set_next(ik->breakpoints());
2001 ik->set_breakpoints(bp);
2002 // do this last:
2003 bp->set(this);
2004 }
2005
2006 static void clear_matches(Method* m, int bci) {
2007 InstanceKlass* ik = m->method_holder();
2008 BreakpointInfo* prev_bp = nullptr;
2009 BreakpointInfo* next_bp;
2010 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
2011 next_bp = bp->next();
2012 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
2013 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
2014 // do this first:
2015 bp->clear(m);
2016 // unhook it
2017 if (prev_bp != nullptr)
2018 prev_bp->set_next(next_bp);
2019 else
2020 ik->set_breakpoints(next_bp);
2021 delete bp;
2022 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
2023 // at same location. So we have multiple matching (method_index and bci)
2024 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
2025 // breakpoint for clear_breakpoint request and keep all other method versions
2026 // BreakpointInfo for future clear_breakpoint request.
2027 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
2028 // which is being called when class is unloaded. We delete all the Breakpoint
2029 // information for all versions of method. We may not correctly restore the original
2030 // bytecode in all method versions, but that is ok. Because the class is being unloaded
2031 // so these methods won't be used anymore.
2032 if (bci >= 0) {
2033 break;
2034 }
2035 } else {
2036 // This one is a keeper.
2037 prev_bp = bp;
2038 }
2039 }
2040 }
2041
2042 void Method::clear_breakpoint(int bci) {
2043 assert(bci >= 0, "");
2044 clear_matches(this, bci);
2045 }
2046
2047 void Method::clear_all_breakpoints() {
2048 clear_matches(this, -1);
2049 }
2050
2051 #endif // INCLUDE_JVMTI
2052
2053 int Method::invocation_count() const {
2054 MethodCounters* mcs = method_counters();
2055 MethodData* mdo = method_data();
2056 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) ||
2057 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) {
2058 return InvocationCounter::count_limit;
2059 } else {
2060 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) +
2061 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0);
2062 }
2063 }
2064
2065 int Method::backedge_count() const {
2066 MethodCounters* mcs = method_counters();
2067 MethodData* mdo = method_data();
2068 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) ||
2069 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) {
2070 return InvocationCounter::count_limit;
2071 } else {
2072 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) +
2073 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0);
2074 }
2075 }
2076
2077 int Method::highest_comp_level() const {
2078 const MethodCounters* mcs = method_counters();
2079 nmethod* nm = code();
2080 int level = (nm != nullptr) ? nm->comp_level() : CompLevel_none;
2081 if (mcs != nullptr) {
2082 return MAX2(mcs->highest_comp_level(), level);
2083 } else {
2084 return CompLevel_none;
2085 }
2086 }
2087
2088 int Method::highest_osr_comp_level() const {
2089 const MethodCounters* mcs = method_counters();
2090 if (mcs != nullptr) {
2091 return mcs->highest_osr_comp_level();
2092 } else {
2093 return CompLevel_none;
2094 }
2095 }
2096
2097 void Method::set_highest_comp_level(int level) {
2098 MethodCounters* mcs = method_counters();
2099 if (mcs != nullptr) {
2100 mcs->set_highest_comp_level(level);
2101 }
2102 }
2103
2104 void Method::set_highest_osr_comp_level(int level) {
2105 MethodCounters* mcs = method_counters();
2106 if (mcs != nullptr) {
2107 mcs->set_highest_osr_comp_level(level);
2108 }
2109 }
2110
2111 #if INCLUDE_JVMTI
2112
2113 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2114 _bci = bci;
2115 _name_index = m->name_index();
2116 _signature_index = m->signature_index();
2117 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2118 if (_orig_bytecode == Bytecodes::_breakpoint)
2119 _orig_bytecode = m->orig_bytecode_at(_bci);
2120 _next = nullptr;
2121 }
2122
2123 void BreakpointInfo::set(Method* method) {
2124 #ifdef ASSERT
2125 {
2126 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2127 if (code == Bytecodes::_breakpoint)
2128 code = method->orig_bytecode_at(_bci);
2129 assert(orig_bytecode() == code, "original bytecode must be the same");
2130 }
2131 #endif
2132 Thread *thread = Thread::current();
2133 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2134 method->incr_number_of_breakpoints(thread);
2135 {
2136 // Deoptimize all dependents on this method
2137 HandleMark hm(thread);
2138 methodHandle mh(thread, method);
2139 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2140 }
2141 }
2142
2143 void BreakpointInfo::clear(Method* method) {
2144 *method->bcp_from(_bci) = orig_bytecode();
2145 assert(method->number_of_breakpoints() > 0, "must not go negative");
2146 method->decr_number_of_breakpoints(Thread::current());
2147 }
2148
2149 #endif // INCLUDE_JVMTI
2150
2151 // jmethodID handling
2152
2153 // This is a block allocating object, sort of like JNIHandleBlock, only a
2154 // lot simpler.
2155 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2156 // never get rid of it.
2157
2158 static const int min_block_size = 8;
2159
2160 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2161 friend class JNIMethodBlock;
2162 Method** _methods;
2163 int _number_of_methods;
2164 int _top;
2165 JNIMethodBlockNode* _next;
2166
2167 public:
2168
2169 JNIMethodBlockNode(int num_methods = min_block_size);
2170
2171 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2172
2173 void ensure_methods(int num_addl_methods) {
2174 if (_top < _number_of_methods) {
2175 num_addl_methods -= _number_of_methods - _top;
2176 if (num_addl_methods <= 0) {
2177 return;
2178 }
2179 }
2180 if (_next == nullptr) {
2181 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2182 } else {
2183 _next->ensure_methods(num_addl_methods);
2184 }
2185 }
2186 };
2187
2188 class JNIMethodBlock : public CHeapObj<mtClass> {
2189 JNIMethodBlockNode _head;
2190 JNIMethodBlockNode *_last_free;
2191 public:
2192 static Method* const _free_method;
2193
2194 JNIMethodBlock(int initial_capacity = min_block_size)
2195 : _head(initial_capacity), _last_free(&_head) {}
2196
2197 void ensure_methods(int num_addl_methods) {
2198 _last_free->ensure_methods(num_addl_methods);
2199 }
2200
2201 Method** add_method(Method* m) {
2202 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2203 if (b->_top < b->_number_of_methods) {
2204 // top points to the next free entry.
2205 int i = b->_top;
2206 b->_methods[i] = m;
2207 b->_top++;
2208 _last_free = b;
2209 return &(b->_methods[i]);
2210 } else if (b->_top == b->_number_of_methods) {
2211 // if the next free entry ran off the block see if there's a free entry
2212 for (int i = 0; i < b->_number_of_methods; i++) {
2213 if (b->_methods[i] == _free_method) {
2214 b->_methods[i] = m;
2215 _last_free = b;
2216 return &(b->_methods[i]);
2217 }
2218 }
2219 // Only check each block once for frees. They're very unlikely.
2220 // Increment top past the end of the block.
2221 b->_top++;
2222 }
2223 // need to allocate a next block.
2224 if (b->_next == nullptr) {
2225 b->_next = _last_free = new JNIMethodBlockNode();
2226 }
2227 }
2228 guarantee(false, "Should always allocate a free block");
2229 return nullptr;
2230 }
2231
2232 bool contains(Method** m) {
2233 if (m == nullptr) return false;
2234 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2235 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2236 // This is a bit of extra checking, for two reasons. One is
2237 // that contains() deals with pointers that are passed in by
2238 // JNI code, so making sure that the pointer is aligned
2239 // correctly is valuable. The other is that <= and > are
2240 // technically not defined on pointers, so the if guard can
2241 // pass spuriously; no modern compiler is likely to make that
2242 // a problem, though (and if one did, the guard could also
2243 // fail spuriously, which would be bad).
2244 ptrdiff_t idx = m - b->_methods;
2245 if (b->_methods + idx == m) {
2246 return true;
2247 }
2248 }
2249 }
2250 return false; // not found
2251 }
2252
2253 // During class unloading the methods are cleared, which is different
2254 // than freed.
2255 void clear_all_methods() {
2256 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2257 for (int i = 0; i< b->_number_of_methods; i++) {
2258 b->_methods[i] = nullptr;
2259 }
2260 }
2261 }
2262 #ifndef PRODUCT
2263 int count_methods() {
2264 // count all allocated methods
2265 int count = 0;
2266 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2267 for (int i = 0; i< b->_number_of_methods; i++) {
2268 if (b->_methods[i] != _free_method) count++;
2269 }
2270 }
2271 return count;
2272 }
2273 #endif // PRODUCT
2274 };
2275
2276 // Something that can't be mistaken for an address or a markWord
2277 Method* const JNIMethodBlock::_free_method = (Method*)55;
2278
2279 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2280 _number_of_methods = MAX2(num_methods, min_block_size);
2281 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2282 for (int i = 0; i < _number_of_methods; i++) {
2283 _methods[i] = JNIMethodBlock::_free_method;
2284 }
2285 }
2286
2287 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2288 // Have to add jmethod_ids() to class loader data thread-safely.
2289 // Also have to add the method to the list safely, which the lock
2290 // protects as well.
2291 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2292 if (cld->jmethod_ids() == nullptr) {
2293 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2294 } else {
2295 cld->jmethod_ids()->ensure_methods(capacity);
2296 }
2297 }
2298
2299 // Add a method id to the jmethod_ids
2300 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2301 // Have to add jmethod_ids() to class loader data thread-safely.
2302 // Also have to add the method to the list safely, which the lock
2303 // protects as well.
2304 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2305
2306 ResourceMark rm;
2307 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name());
2308 if (cld->jmethod_ids() == nullptr) {
2309 cld->set_jmethod_ids(new JNIMethodBlock());
2310 }
2311 // jmethodID is a pointer to Method*
2312 return (jmethodID)cld->jmethod_ids()->add_method(m);
2313 }
2314
2315 jmethodID Method::jmethod_id() {
2316 methodHandle mh(Thread::current(), this);
2317 return method_holder()->get_jmethod_id(mh);
2318 }
2319
2320 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2321 // Can't assert the method_holder is the same because the new method has the
2322 // scratch method holder.
2323 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2324 == new_method->method_holder()->class_loader() ||
2325 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2326 "changing to a different class loader");
2327 // Just change the method in place, jmethodID pointer doesn't change.
2328 *((Method**)jmid) = new_method;
2329 }
2330
2331 bool Method::is_method_id(jmethodID mid) {
2332 Method* m = resolve_jmethod_id(mid);
2333 assert(m != nullptr, "should be called with non-null method");
2334 InstanceKlass* ik = m->method_holder();
2335 ClassLoaderData* cld = ik->class_loader_data();
2336 if (cld->jmethod_ids() == nullptr) return false;
2337 return (cld->jmethod_ids()->contains((Method**)mid));
2338 }
2339
2340 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2341 if (mid == nullptr) return nullptr;
2342 Method* o = resolve_jmethod_id(mid);
2343 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2344 return nullptr;
2345 }
2346 // Method should otherwise be valid. Assert for testing.
2347 assert(is_valid_method(o), "should be valid jmethodid");
2348 // If the method's class holder object is unreferenced, but not yet marked as
2349 // unloaded, we need to return null here too because after a safepoint, its memory
2350 // will be reclaimed.
2351 return o->method_holder()->is_loader_alive() ? o : nullptr;
2352 };
2353
2354 void Method::set_on_stack(const bool value) {
2355 // Set both the method itself and its constant pool. The constant pool
2356 // on stack means some method referring to it is also on the stack.
2357 constants()->set_on_stack(value);
2358
2359 bool already_set = on_stack_flag();
2360 set_on_stack_flag(value);
2361 if (value && !already_set) {
2362 MetadataOnStackMark::record(this);
2363 }
2364 }
2365
2366 void Method::record_gc_epoch() {
2367 // If any method is on the stack in continuations, none of them can be reclaimed,
2368 // so save the marking cycle to check for the whole class in the cpCache.
2369 // The cpCache is writeable.
2370 constants()->cache()->record_gc_epoch();
2371 }
2372
2373 // Called when the class loader is unloaded to make all methods weak.
2374 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2375 loader_data->jmethod_ids()->clear_all_methods();
2376 }
2377
2378 void Method::clear_jmethod_id() {
2379 // Being at a safepoint prevents racing against other class redefinitions
2380 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2381 // The jmethodID is not stored in the Method instance, we need to look it up first
2382 jmethodID methodid = find_jmethod_id_or_null();
2383 // We need to make sure that jmethodID actually resolves to this method
2384 // - multiple redefined versions may share jmethodID slots and if a method
2385 // has already been rewired to a newer version we could be removing reference
2386 // to a still existing method instance
2387 if (methodid != nullptr && *((Method**)methodid) == this) {
2388 *((Method**)methodid) = nullptr;
2389 }
2390 }
2391
2392 bool Method::has_method_vptr(const void* ptr) {
2393 Method m;
2394 // This assumes that the vtbl pointer is the first word of a C++ object.
2395 return dereference_vptr(&m) == dereference_vptr(ptr);
2396 }
2397
2398 // Check that this pointer is valid by checking that the vtbl pointer matches
2399 bool Method::is_valid_method(const Method* m) {
2400 if (m == nullptr) {
2401 return false;
2402 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2403 // Quick sanity check on pointer.
2404 return false;
2405 } else if (!os::is_readable_range(m, m + 1)) {
2406 return false;
2407 } else if (m->is_shared()) {
2408 return CppVtables::is_valid_shared_method(m);
2409 } else if (Metaspace::contains_non_shared(m)) {
2410 return has_method_vptr((const void*)m);
2411 } else {
2412 return false;
2413 }
2414 }
2415
2416 #ifndef PRODUCT
2417 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2418 out->print("%d", loader_data->jmethod_ids()->count_methods());
2419 }
2420 #endif // PRODUCT
2421
2422
2423 // Printing
2424
2425 #ifndef PRODUCT
2426
2427 void Method::print_on(outputStream* st) const {
2428 ResourceMark rm;
2429 assert(is_method(), "must be method");
2430 st->print_cr("%s", internal_name());
2431 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2432 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2433 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2434 constants()->print_value_on(st); st->cr();
2435 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2436 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2437 st->print (" - name: "); name()->print_value_on(st); st->cr();
2438 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2439 st->print_cr(" - max stack: %d", max_stack());
2440 st->print_cr(" - max locals: %d", max_locals());
2441 st->print_cr(" - size of params: %d", size_of_parameters());
2442 st->print_cr(" - method size: %d", method_size());
2443 if (intrinsic_id() != vmIntrinsics::_none)
2444 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2445 if (highest_comp_level() != CompLevel_none)
2446 st->print_cr(" - highest level: %d", highest_comp_level());
2447 st->print_cr(" - vtable index: %d", _vtable_index);
2448 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2449 st->print( " - adapters: ");
2450 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2451 if (a == nullptr)
2452 st->print_cr(PTR_FORMAT, p2i(a));
2453 else
2454 a->print_adapter_on(st);
2455 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2456 st->print_cr(" - code size: %d", code_size());
2457 if (code_size() != 0) {
2458 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2459 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2460 }
2461 if (method_data() != nullptr) {
2462 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2463 }
2464 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2465 if (checked_exceptions_length() > 0) {
2466 CheckedExceptionElement* table = checked_exceptions_start();
2467 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2468 if (Verbose) {
2469 for (int i = 0; i < checked_exceptions_length(); i++) {
2470 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2471 }
2472 }
2473 }
2474 if (has_linenumber_table()) {
2475 u_char* table = compressed_linenumber_table();
2476 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2477 if (Verbose) {
2478 CompressedLineNumberReadStream stream(table);
2479 while (stream.read_pair()) {
2480 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2481 }
2482 }
2483 }
2484 st->print_cr(" - localvar length: %d", localvariable_table_length());
2485 if (localvariable_table_length() > 0) {
2486 LocalVariableTableElement* table = localvariable_table_start();
2487 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2488 if (Verbose) {
2489 for (int i = 0; i < localvariable_table_length(); i++) {
2490 int bci = table[i].start_bci;
2491 int len = table[i].length;
2492 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2493 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2494 int slot = table[i].slot;
2495 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2496 }
2497 }
2498 }
2499 if (code() != nullptr) {
2500 st->print (" - compiled code: ");
2501 code()->print_value_on(st);
2502 }
2503 if (is_native()) {
2504 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2505 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2506 }
2507 }
2508
2509 void Method::print_linkage_flags(outputStream* st) {
2510 access_flags().print_on(st);
2511 if (is_default_method()) {
2512 st->print("default ");
2513 }
2514 if (is_overpass()) {
2515 st->print("overpass ");
2516 }
2517 }
2518 #endif //PRODUCT
2519
2520 void Method::print_value_on(outputStream* st) const {
2521 assert(is_method(), "must be method");
2522 st->print("%s", internal_name());
2523 print_address_on(st);
2524 st->print(" ");
2525 name()->print_value_on(st);
2526 st->print(" ");
2527 signature()->print_value_on(st);
2528 st->print(" in ");
2529 method_holder()->print_value_on(st);
2530 if (WizardMode) st->print("#%d", _vtable_index);
2531 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2532 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2533 }
2534
2535 // Verification
2536
2537 void Method::verify_on(outputStream* st) {
2538 guarantee(is_method(), "object must be method");
2539 guarantee(constants()->is_constantPool(), "should be constant pool");
2540 MethodData* md = method_data();
2541 guarantee(md == nullptr ||
2542 md->is_methodData(), "should be method data");
2543 }