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/arguments.hpp"
68 #include "runtime/continuationEntry.hpp"
69 #include "runtime/frame.inline.hpp"
70 #include "runtime/handles.inline.hpp"
71 #include "runtime/init.hpp"
72 #include "runtime/java.hpp"
73 #include "runtime/orderAccess.hpp"
74 #include "runtime/perfData.hpp"
75 #include "runtime/relocator.hpp"
76 #include "runtime/safepointVerifiers.hpp"
77 #include "runtime/sharedRuntime.hpp"
78 #include "runtime/signature.hpp"
79 #include "runtime/threads.hpp"
80 #include "runtime/vm_version.hpp"
81 #include "utilities/align.hpp"
82 #include "utilities/quickSort.hpp"
83 #include "utilities/vmError.hpp"
84 #include "utilities/xmlstream.hpp"
85
86 // Implementation of Method
87
88 Method* Method::allocate(ClassLoaderData* loader_data,
89 int byte_code_size,
90 AccessFlags access_flags,
91 InlineTableSizes* sizes,
92 ConstMethod::MethodType method_type,
93 Symbol* name,
94 TRAPS) {
95 assert(!access_flags.is_native() || byte_code_size == 0,
96 "native methods should not contain byte codes");
97 ConstMethod* cm = ConstMethod::allocate(loader_data,
98 byte_code_size,
99 sizes,
100 method_type,
101 CHECK_NULL);
102 int size = Method::size(access_flags.is_native());
103 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
104 }
105
106 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
107 NoSafepointVerifier no_safepoint;
108 set_constMethod(xconst);
109 set_access_flags(access_flags);
110 set_intrinsic_id(vmIntrinsics::_none);
111 clear_method_data();
112 clear_method_counters();
113 set_vtable_index(Method::garbage_vtable_index);
114
115 // Fix and bury in Method*
116 set_interpreter_entry(nullptr); // sets i2i entry and from_int
117 set_adapter_entry(nullptr);
118 Method::clear_code(); // from_c/from_i get set to c2i/i2i
119
120 if (access_flags.is_native()) {
121 clear_native_function();
122 set_signature_handler(nullptr);
123 }
124
125 NOT_PRODUCT(set_compiled_invocation_count(0);)
126 // Name is very useful for debugging.
127 NOT_PRODUCT(_name = name;)
128 }
129
130 // Release Method*. The nmethod will be gone when we get here because
131 // we've walked the code cache.
132 void Method::deallocate_contents(ClassLoaderData* loader_data) {
133 MetadataFactory::free_metadata(loader_data, constMethod());
134 set_constMethod(nullptr);
135 MetadataFactory::free_metadata(loader_data, method_data());
136 clear_method_data();
137 MetadataFactory::free_metadata(loader_data, method_counters());
138 clear_method_counters();
139 // The nmethod will be gone when we get here.
140 if (code() != nullptr) _code = nullptr;
141 }
142
143 void Method::release_C_heap_structures() {
144 if (method_data()) {
145 method_data()->release_C_heap_structures();
146
147 // Destroy MethodData embedded lock
148 method_data()->~MethodData();
149 }
150 }
151
152 address Method::get_i2c_entry() {
153 assert(adapter() != nullptr, "must have");
154 return adapter()->get_i2c_entry();
155 }
156
157 address Method::get_c2i_entry() {
158 assert(adapter() != nullptr, "must have");
159 return adapter()->get_c2i_entry();
160 }
161
162 address Method::get_c2i_unverified_entry() {
163 assert(adapter() != nullptr, "must have");
164 return adapter()->get_c2i_unverified_entry();
165 }
166
167 address Method::get_c2i_no_clinit_check_entry() {
168 assert(VM_Version::supports_fast_class_init_checks(), "");
169 assert(adapter() != nullptr, "must have");
170 return adapter()->get_c2i_no_clinit_check_entry();
171 }
172
173 char* Method::name_and_sig_as_C_string() const {
174 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
175 }
176
177 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
178 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
179 }
180
181 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
182 const char* klass_name = klass->external_name();
183 int klass_name_len = (int)strlen(klass_name);
184 int method_name_len = method_name->utf8_length();
185 int len = klass_name_len + 2 + method_name_len + signature->utf8_length();
186 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
187 strcpy(dest, klass_name);
188 dest[klass_name_len + 0] = ':';
189 dest[klass_name_len + 1] = ':';
190 strcpy(&dest[klass_name_len + 2], method_name->as_C_string());
191 strcpy(&dest[klass_name_len + 2 + method_name_len], signature->as_C_string());
192 dest[len] = 0;
193 return dest;
194 }
195
196 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
197 Symbol* klass_name = klass->name();
198 klass_name->as_klass_external_name(buf, size);
199 int len = (int)strlen(buf);
200
201 if (len < size - 1) {
202 buf[len++] = '.';
203
204 method_name->as_C_string(&(buf[len]), size - len);
205 len = (int)strlen(buf);
206
207 signature->as_C_string(&(buf[len]), size - len);
208 }
209
210 return buf;
211 }
212
213 const char* Method::external_name() const {
214 return external_name(constants()->pool_holder(), name(), signature());
215 }
216
217 void Method::print_external_name(outputStream *os) const {
218 print_external_name(os, constants()->pool_holder(), name(), signature());
219 }
220
221 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
222 stringStream ss;
223 print_external_name(&ss, klass, method_name, signature);
224 return ss.as_string();
225 }
226
227 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
228 signature->print_as_signature_external_return_type(os);
229 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
230 signature->print_as_signature_external_parameters(os);
231 os->print(")");
232 }
233
234 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
235 if (log_is_enabled(Debug, exceptions)) {
236 ResourceMark rm(THREAD);
237 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
238 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
239 }
240 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
241 // access exception table
242 ExceptionTable table(mh());
243 int length = table.length();
244 // iterate through all entries sequentially
245 constantPoolHandle pool(THREAD, mh->constants());
246 for (int i = 0; i < length; i ++) {
247 //reacquire the table in case a GC happened
248 ExceptionTable table(mh());
249 int beg_bci = table.start_pc(i);
250 int end_bci = table.end_pc(i);
251 assert(beg_bci <= end_bci, "inconsistent exception table");
252 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
253 beg_bci, end_bci);
254
255 if (beg_bci <= throw_bci && throw_bci < end_bci) {
256 // exception handler bci range covers throw_bci => investigate further
257 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
258
259 int handler_bci = table.handler_pc(i);
260 int klass_index = table.catch_type_index(i);
261 if (klass_index == 0) {
262 if (log_is_enabled(Info, exceptions)) {
263 ResourceMark rm(THREAD);
264 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
265 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
266 }
267 return handler_bci;
268 } else if (ex_klass == nullptr) {
269 // Is this even possible?
270 if (log_is_enabled(Info, exceptions)) {
271 ResourceMark rm(THREAD);
272 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
273 mh()->name()->as_C_string(), handler_bci);
274 }
275 return handler_bci;
276 } else {
277 if (log_is_enabled(Debug, exceptions)) {
278 ResourceMark rm(THREAD);
279 log_debug(exceptions)(" - resolving catch type \"%s\"",
280 pool->klass_name_at(klass_index)->as_C_string());
281 }
282 // we know the exception class => get the constraint class
283 // this may require loading of the constraint class; if verification
284 // fails or some other exception occurs, return handler_bci
285 Klass* k = pool->klass_at(klass_index, THREAD);
286 if (HAS_PENDING_EXCEPTION) {
287 if (log_is_enabled(Debug, exceptions)) {
288 ResourceMark rm(THREAD);
289 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
290 PENDING_EXCEPTION->klass()->external_name());
291 }
292 return handler_bci;
293 }
294 assert(k != nullptr, "klass not loaded");
295 if (ex_klass->is_subtype_of(k)) {
296 if (log_is_enabled(Info, exceptions)) {
297 ResourceMark rm(THREAD);
298 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
299 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
300 }
301 return handler_bci;
302 }
303 }
304 }
305 }
306
307 if (log_is_enabled(Debug, exceptions)) {
308 ResourceMark rm(THREAD);
309 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
310 ex_klass->external_name(), mh->name()->as_C_string());
311 }
312
313 return -1;
314 }
315
316 void Method::mask_for(int bci, InterpreterOopMap* mask) {
317 methodHandle h_this(Thread::current(), this);
318 mask_for(h_this, bci, mask);
319 }
320
321 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
322 assert(this_mh() == this, "Sanity");
323 method_holder()->mask_for(this_mh, bci, mask);
324 }
325
326 int Method::bci_from(address bcp) const {
327 if (is_native() && bcp == nullptr) {
328 return 0;
329 }
330 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
331 // may call this after interrupting a nested ResourceMark.
332 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
333 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
334
335 return int(bcp - code_base());
336 }
337
338
339 int Method::validate_bci(int bci) const {
340 return (bci == 0 || bci < code_size()) ? bci : -1;
341 }
342
343 // Return bci if it appears to be a valid bcp
344 // Return -1 otherwise.
345 // Used by profiling code, when invalid data is a possibility.
346 // The caller is responsible for validating the Method* itself.
347 int Method::validate_bci_from_bcp(address bcp) const {
348 // keep bci as -1 if not a valid bci
349 int bci = -1;
350 if (bcp == nullptr || bcp == code_base()) {
351 // code_size() may return 0 and we allow 0 here
352 // the method may be native
353 bci = 0;
354 } else if (contains(bcp)) {
355 bci = int(bcp - code_base());
356 }
357 // Assert that if we have dodged any asserts, bci is negative.
358 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
359 return bci;
360 }
361
362 address Method::bcp_from(int bci) const {
363 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
364 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
365 address bcp = code_base() + bci;
366 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
367 return bcp;
368 }
369
370 address Method::bcp_from(address bcp) const {
371 if (is_native() && bcp == nullptr) {
372 return code_base();
373 } else {
374 return bcp;
375 }
376 }
377
378 int Method::size(bool is_native) {
379 // If native, then include pointers for native_function and signature_handler
380 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
381 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
382 return align_metadata_size(header_size() + extra_words);
383 }
384
385 Symbol* Method::klass_name() const {
386 return method_holder()->name();
387 }
388
389 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
390 LogStreamHandle(Trace, cds) lsh;
391 if (lsh.is_enabled()) {
392 lsh.print("Iter(Method): %p ", this);
393 print_external_name(&lsh);
394 lsh.cr();
395 }
396 if (method_holder() != nullptr && !method_holder()->is_rewritten()) {
397 // holder is null for MH intrinsic methods
398 it->push(&_constMethod, MetaspaceClosure::_writable);
399 } else {
400 it->push(&_constMethod);
401 }
402 it->push(&_method_data);
403 it->push(&_method_counters);
404 NOT_PRODUCT(it->push(&_name);)
405 }
406
407 #if INCLUDE_CDS
408 // Attempt to return method to original state. Clear any pointers
409 // (to objects outside the shared spaces). We won't be able to predict
410 // where they should point in a new JVM. Further initialize some
411 // entries now in order allow them to be write protected later.
412
413 void Method::remove_unshareable_info() {
414 unlink_method();
415 if (method_data() != nullptr) {
416 method_data()->remove_unshareable_info();
417 }
418 if (method_counters() != nullptr) {
419 method_counters()->remove_unshareable_info();
420 }
421 JFR_ONLY(REMOVE_METHOD_ID(this);)
422 }
423
424 void Method::restore_unshareable_info(TRAPS) {
425 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
426 if (method_data() != nullptr) {
427 method_data()->restore_unshareable_info(CHECK);
428 }
429 if (method_counters() != nullptr) {
430 method_counters()->restore_unshareable_info(CHECK);
431 }
432 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
433 assert(!pending_queue_processed(), "method's pending_queued_processed flag should not be set");
434 }
435 #endif
436
437 void Method::set_vtable_index(int index) {
438 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
439 // At runtime initialize_vtable is rerun as part of link_class_impl()
440 // for a shared class loaded by the non-boot loader to obtain the loader
441 // constraints based on the runtime classloaders' context.
442 return; // don't write into the shared class
443 } else {
444 _vtable_index = index;
445 }
446 }
447
448 void Method::set_itable_index(int index) {
449 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
450 // At runtime initialize_itable is rerun as part of link_class_impl()
451 // for a shared class loaded by the non-boot loader to obtain the loader
452 // constraints based on the runtime classloaders' context. The dumptime
453 // itable index should be the same as the runtime index.
454 assert(_vtable_index == itable_index_max - index,
455 "archived itable index is different from runtime index");
456 return; // don’t write into the shared class
457 } else {
458 _vtable_index = itable_index_max - index;
459 }
460 assert(valid_itable_index(), "");
461 }
462
463 // The RegisterNatives call being attempted tried to register with a method that
464 // is not native. Ask JVM TI what prefixes have been specified. Then check
465 // to see if the native method is now wrapped with the prefixes. See the
466 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
467 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
468 #if INCLUDE_JVMTI
469 ResourceMark rm(THREAD);
470 Method* method;
471 int name_len = name->utf8_length();
472 char* name_str = name->as_utf8();
473 int prefix_count;
474 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
475 for (int i = 0; i < prefix_count; i++) {
476 char* prefix = prefixes[i];
477 int prefix_len = (int)strlen(prefix);
478
479 // try adding this prefix to the method name and see if it matches another method name
480 int trial_len = name_len + prefix_len;
481 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
482 strcpy(trial_name_str, prefix);
483 strcat(trial_name_str, name_str);
484 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
485 if (trial_name == nullptr) {
486 continue; // no such symbol, so this prefix wasn't used, try the next prefix
487 }
488 method = k->lookup_method(trial_name, signature);
489 if (method == nullptr) {
490 continue; // signature doesn't match, try the next prefix
491 }
492 if (method->is_native()) {
493 method->set_is_prefixed_native();
494 return method; // wahoo, we found a prefixed version of the method, return it
495 }
496 // found as non-native, so prefix is good, add it, probably just need more prefixes
497 name_len = trial_len;
498 name_str = trial_name_str;
499 }
500 #endif // INCLUDE_JVMTI
501 return nullptr; // not found
502 }
503
504 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
505 Method* method = k->lookup_method(name, signature);
506 if (method == nullptr) {
507 ResourceMark rm(THREAD);
508 stringStream st;
509 st.print("Method '");
510 print_external_name(&st, k, name, signature);
511 st.print("' name or signature does not match");
512 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
513 }
514 if (!method->is_native()) {
515 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
516 method = find_prefixed_native(k, name, signature, THREAD);
517 if (method == nullptr) {
518 ResourceMark rm(THREAD);
519 stringStream st;
520 st.print("Method '");
521 print_external_name(&st, k, name, signature);
522 st.print("' is not declared as native");
523 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
524 }
525 }
526
527 if (entry != nullptr) {
528 method->set_native_function(entry, native_bind_event_is_interesting);
529 } else {
530 method->clear_native_function();
531 }
532 if (log_is_enabled(Debug, jni, resolve)) {
533 ResourceMark rm(THREAD);
534 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
535 method->method_holder()->external_name(),
536 method->name()->as_C_string());
537 }
538 return true;
539 }
540
541 bool Method::was_executed_more_than(int n) {
542 // Invocation counter is reset when the Method* is compiled.
543 // If the method has compiled code we therefore assume it has
544 // be executed more than n times.
545 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
546 // interpreter doesn't bump invocation counter of trivial methods
547 // compiler does not bump invocation counter of compiled methods
548 return true;
549 }
550 else if ((method_counters() != nullptr &&
551 method_counters()->invocation_counter()->carry()) ||
552 (method_data() != nullptr &&
553 method_data()->invocation_counter()->carry())) {
554 // The carry bit is set when the counter overflows and causes
555 // a compilation to occur. We don't know how many times
556 // the counter has been reset, so we simply assume it has
557 // been executed more than n times.
558 return true;
559 } else {
560 return invocation_count() > n;
561 }
562 }
563
564 void Method::print_invocation_count(outputStream* st) {
565 //---< compose+print method return type, klass, name, and signature >---
566 if (is_static()) { st->print("static "); }
567 if (is_final()) { st->print("final "); }
568 if (is_synchronized()) { st->print("synchronized "); }
569 if (is_native()) { st->print("native "); }
570 st->print("%s::", method_holder()->external_name());
571 name()->print_symbol_on(st);
572 signature()->print_symbol_on(st);
573
574 if (WizardMode) {
575 // dump the size of the byte codes
576 st->print(" {%d}", code_size());
577 }
578 st->cr();
579
580 // Counting based on signed int counters tends to overflow with
581 // longer-running workloads on fast machines. The counters under
582 // consideration here, however, are limited in range by counting
583 // logic. See InvocationCounter:count_limit for example.
584 // No "overflow precautions" need to be implemented here.
585 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
586 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
587 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
588
589 if (method_data() != nullptr) {
590 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
591 }
592
593 #ifndef PRODUCT
594 if (CountCompiledCalls) {
595 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
596 }
597 #endif
598 }
599
600 MethodTrainingData* Method::training_data_or_null() const {
601 MethodCounters* mcs = method_counters();
602 if (mcs == nullptr) {
603 return nullptr;
604 } else {
605 return mcs->method_training_data();
606 }
607 }
608
609 bool Method::init_training_data(MethodTrainingData* tdata) {
610 MethodCounters* mcs = method_counters();
611 if (mcs == nullptr) {
612 return false;
613 } else {
614 return mcs->init_method_training_data(tdata);
615 }
616 }
617
618 bool Method::install_training_method_data(const methodHandle& method) {
619 MethodTrainingData* mtd = MethodTrainingData::find(method);
620 if (mtd != nullptr && mtd->has_holder() && mtd->final_profile() != nullptr &&
621 mtd->holder() == method() && mtd->final_profile()->method() == method()) { // FIXME
622 Atomic::replace_if_null(&method->_method_data, mtd->final_profile());
623 return true;
624 }
625 return false;
626 }
627
628 // Build a MethodData* object to hold profiling information collected on this
629 // method when requested.
630 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
631 if (install_training_method_data(method)) {
632 return;
633 }
634 // Do not profile the method if metaspace has hit an OOM previously
635 // allocating profiling data. Callers clear pending exception so don't
636 // add one here.
637 if (ClassLoaderDataGraph::has_metaspace_oom()) {
638 return;
639 }
640
641 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
642 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
643 if (HAS_PENDING_EXCEPTION) {
644 CompileBroker::log_metaspace_failure();
645 ClassLoaderDataGraph::set_metaspace_oom(true);
646 return; // return the exception (which is cleared)
647 }
648
649 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
650 MetadataFactory::free_metadata(loader_data, method_data);
651 return;
652 }
653
654 /*
655 LogStreamHandle(Info, mdo) lsh;
656 if (lsh.is_enabled()) {
657 ResourceMark rm(THREAD);
658 lsh.print("build_profiling_method_data for ");
659 method->print_name(&lsh);
660 lsh.cr();
661 }
662 */
663 if (ForceProfiling && TrainingData::need_data()) {
664 MethodTrainingData* mtd = MethodTrainingData::make(method, false);
665 guarantee(mtd != nullptr, "");
666 }
667 if (PrintMethodData) {
668 ResourceMark rm(THREAD);
669 tty->print("build_profiling_method_data for ");
670 method->print_name(tty);
671 tty->cr();
672 // At the end of the run, the MDO, full of data, will be dumped.
673 }
674 }
675
676 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
677 // Do not profile the method if metaspace has hit an OOM previously
678 if (ClassLoaderDataGraph::has_metaspace_oom()) {
679 return nullptr;
680 }
681
682 methodHandle mh(current, m);
683 MethodCounters* counters;
684 if (current->is_Java_thread()) {
685 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
686 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
687 // if needed.
688 counters = MethodCounters::allocate_with_exception(mh, THREAD);
689 if (HAS_PENDING_EXCEPTION) {
690 CLEAR_PENDING_EXCEPTION;
691 }
692 } else {
693 // Call metaspace allocation that doesn't throw exception if the
694 // current thread isn't a JavaThread, ie. the VMThread.
695 counters = MethodCounters::allocate_no_exception(mh);
696 }
697
698 if (counters == nullptr) {
699 CompileBroker::log_metaspace_failure();
700 ClassLoaderDataGraph::set_metaspace_oom(true);
701 return nullptr;
702 }
703
704 if (!mh->init_method_counters(counters)) {
705 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
706 }
707
708 if (ForceProfiling && TrainingData::need_data()) {
709 MethodTrainingData* mtd = MethodTrainingData::make(mh, false);
710 guarantee(mtd != nullptr, "");
711 }
712
713 return mh->method_counters();
714 }
715
716 bool Method::init_method_counters(MethodCounters* counters) {
717 // Try to install a pointer to MethodCounters, return true on success.
718 return Atomic::replace_if_null(&_method_counters, counters);
719 }
720
721 void Method::set_exception_handler_entered(int handler_bci) {
722 if (ProfileExceptionHandlers) {
723 MethodData* mdo = method_data();
724 if (mdo != nullptr) {
725 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
726 handler_data.set_exception_handler_entered();
727 }
728 }
729 }
730
731 int Method::extra_stack_words() {
732 // not an inline function, to avoid a header dependency on Interpreter
733 return extra_stack_entries() * Interpreter::stackElementSize;
734 }
735
736 bool Method::compute_has_loops_flag() {
737 BytecodeStream bcs(methodHandle(Thread::current(), this));
738 Bytecodes::Code bc;
739
740 while ((bc = bcs.next()) >= 0) {
741 switch (bc) {
742 case Bytecodes::_ifeq:
743 case Bytecodes::_ifnull:
744 case Bytecodes::_iflt:
745 case Bytecodes::_ifle:
746 case Bytecodes::_ifne:
747 case Bytecodes::_ifnonnull:
748 case Bytecodes::_ifgt:
749 case Bytecodes::_ifge:
750 case Bytecodes::_if_icmpeq:
751 case Bytecodes::_if_icmpne:
752 case Bytecodes::_if_icmplt:
753 case Bytecodes::_if_icmpgt:
754 case Bytecodes::_if_icmple:
755 case Bytecodes::_if_icmpge:
756 case Bytecodes::_if_acmpeq:
757 case Bytecodes::_if_acmpne:
758 case Bytecodes::_goto:
759 case Bytecodes::_jsr:
760 if (bcs.dest() < bcs.next_bci()) {
761 return set_has_loops();
762 }
763 break;
764
765 case Bytecodes::_goto_w:
766 case Bytecodes::_jsr_w:
767 if (bcs.dest_w() < bcs.next_bci()) {
768 return set_has_loops();
769 }
770 break;
771
772 case Bytecodes::_lookupswitch: {
773 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
774 if (lookupswitch.default_offset() < 0) {
775 return set_has_loops();
776 } else {
777 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
778 LookupswitchPair pair = lookupswitch.pair_at(i);
779 if (pair.offset() < 0) {
780 return set_has_loops();
781 }
782 }
783 }
784 break;
785 }
786 case Bytecodes::_tableswitch: {
787 Bytecode_tableswitch tableswitch(this, bcs.bcp());
788 if (tableswitch.default_offset() < 0) {
789 return set_has_loops();
790 } else {
791 for (int i = 0; i < tableswitch.length(); ++i) {
792 if (tableswitch.dest_offset_at(i) < 0) {
793 return set_has_loops();
794 }
795 }
796 }
797 break;
798 }
799 default:
800 break;
801 }
802 }
803
804 _flags.set_has_loops_flag_init(true);
805 return false;
806 }
807
808 bool Method::is_final_method(AccessFlags class_access_flags) const {
809 // or "does_not_require_vtable_entry"
810 // default method or overpass can occur, is not final (reuses vtable entry)
811 // private methods in classes get vtable entries for backward class compatibility.
812 if (is_overpass() || is_default_method()) return false;
813 return is_final() || class_access_flags.is_final();
814 }
815
816 bool Method::is_final_method() const {
817 return is_final_method(method_holder()->access_flags());
818 }
819
820 bool Method::is_default_method() const {
821 if (method_holder() != nullptr &&
822 method_holder()->is_interface() &&
823 !is_abstract() && !is_private()) {
824 return true;
825 } else {
826 return false;
827 }
828 }
829
830 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
831 if (is_final_method(class_access_flags)) return true;
832 #ifdef ASSERT
833 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
834 if (class_access_flags.is_interface()) {
835 ResourceMark rm;
836 assert(is_nonv == is_static() || is_nonv == is_private(),
837 "nonvirtual unexpected for non-static, non-private: %s",
838 name_and_sig_as_C_string());
839 }
840 #endif
841 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
842 return vtable_index() == nonvirtual_vtable_index;
843 }
844
845 bool Method::can_be_statically_bound() const {
846 return can_be_statically_bound(method_holder()->access_flags());
847 }
848
849 bool Method::can_be_statically_bound(InstanceKlass* context) const {
850 return (method_holder() == context) && can_be_statically_bound();
851 }
852
853 /**
854 * Returns false if this is one of specially treated methods for
855 * which we have to provide stack trace in throw in compiled code.
856 * Returns true otherwise.
857 */
858 bool Method::can_omit_stack_trace() {
859 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
860 return false; // All methods in sun.invoke.util.ValueConversions
861 }
862 return true;
863 }
864
865 bool Method::is_accessor() const {
866 return is_getter() || is_setter();
867 }
868
869 bool Method::is_getter() const {
870 if (code_size() != 5) return false;
871 if (size_of_parameters() != 1) return false;
872 if (java_code_at(0) != Bytecodes::_aload_0) return false;
873 if (java_code_at(1) != Bytecodes::_getfield) return false;
874 switch (java_code_at(4)) {
875 case Bytecodes::_ireturn:
876 case Bytecodes::_lreturn:
877 case Bytecodes::_freturn:
878 case Bytecodes::_dreturn:
879 case Bytecodes::_areturn:
880 break;
881 default:
882 return false;
883 }
884 return true;
885 }
886
887 bool Method::is_setter() const {
888 if (code_size() != 6) return false;
889 if (java_code_at(0) != Bytecodes::_aload_0) return false;
890 switch (java_code_at(1)) {
891 case Bytecodes::_iload_1:
892 case Bytecodes::_aload_1:
893 case Bytecodes::_fload_1:
894 if (size_of_parameters() != 2) return false;
895 break;
896 case Bytecodes::_dload_1:
897 case Bytecodes::_lload_1:
898 if (size_of_parameters() != 3) return false;
899 break;
900 default:
901 return false;
902 }
903 if (java_code_at(2) != Bytecodes::_putfield) return false;
904 if (java_code_at(5) != Bytecodes::_return) return false;
905 return true;
906 }
907
908 bool Method::is_constant_getter() const {
909 int last_index = code_size() - 1;
910 // Check if the first 1-3 bytecodes are a constant push
911 // and the last bytecode is a return.
912 return (2 <= code_size() && code_size() <= 4 &&
913 Bytecodes::is_const(java_code_at(0)) &&
914 Bytecodes::length_for(java_code_at(0)) == last_index &&
915 Bytecodes::is_return(java_code_at(last_index)));
916 }
917
918 bool Method::is_initializer() const {
919 return is_object_initializer() || is_static_initializer();
920 }
921
922 bool Method::has_valid_initializer_flags() const {
923 return (is_static() ||
924 method_holder()->major_version() < 51);
925 }
926
927 bool Method::is_static_initializer() const {
928 // For classfiles version 51 or greater, ensure that the clinit method is
929 // static. Non-static methods with the name "<clinit>" are not static
930 // initializers. (older classfiles exempted for backward compatibility)
931 return name() == vmSymbols::class_initializer_name() &&
932 has_valid_initializer_flags();
933 }
934
935 bool Method::is_object_initializer() const {
936 return name() == vmSymbols::object_initializer_name();
937 }
938
939 bool Method::needs_clinit_barrier() const {
940 return is_static() && !method_holder()->is_initialized();
941 }
942
943 bool Method::code_has_clinit_barriers() const {
944 nmethod* nm = code();
945 return (nm != nullptr) && nm->has_clinit_barriers();
946 }
947
948 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
949 int length = method->checked_exceptions_length();
950 if (length == 0) { // common case
951 return objArrayHandle(THREAD, Universe::the_empty_class_array());
952 } else {
953 methodHandle h_this(THREAD, method);
954 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
955 objArrayHandle mirrors (THREAD, m_oop);
956 for (int i = 0; i < length; i++) {
957 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
958 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
959 if (log_is_enabled(Warning, exceptions) &&
960 !k->is_subclass_of(vmClasses::Throwable_klass())) {
961 ResourceMark rm(THREAD);
962 log_warning(exceptions)(
963 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
964 k->external_name(), method->external_name());
965 }
966 mirrors->obj_at_put(i, k->java_mirror());
967 }
968 return mirrors;
969 }
970 };
971
972
973 int Method::line_number_from_bci(int bci) const {
974 int best_bci = 0;
975 int best_line = -1;
976 if (bci == SynchronizationEntryBCI) bci = 0;
977 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
978 // The line numbers are a short array of 2-tuples [start_pc, line_number].
979 // Not necessarily sorted and not necessarily one-to-one.
980 CompressedLineNumberReadStream stream(compressed_linenumber_table());
981 while (stream.read_pair()) {
982 if (stream.bci() == bci) {
983 // perfect match
984 return stream.line();
985 } else {
986 // update best_bci/line
987 if (stream.bci() < bci && stream.bci() >= best_bci) {
988 best_bci = stream.bci();
989 best_line = stream.line();
990 }
991 }
992 }
993 }
994 return best_line;
995 }
996
997
998 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
999 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
1000 Thread *thread = Thread::current();
1001 Symbol* klass_name = constants()->klass_name_at(klass_index);
1002 Handle loader(thread, method_holder()->class_loader());
1003 Handle prot (thread, method_holder()->protection_domain());
1004 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != nullptr;
1005 } else {
1006 return true;
1007 }
1008 }
1009
1010
1011 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1012 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1013 if (must_be_resolved) {
1014 // Make sure klass is resolved in constantpool.
1015 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
1016 }
1017 return is_klass_loaded_by_klass_index(klass_index);
1018 }
1019
1020
1021 void Method::set_native_function(address function, bool post_event_flag) {
1022 assert(function != nullptr, "use clear_native_function to unregister natives");
1023 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1024 address* native_function = native_function_addr();
1025
1026 // We can see racers trying to place the same native function into place. Once
1027 // is plenty.
1028 address current = *native_function;
1029 if (current == function) return;
1030 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1031 function != nullptr) {
1032 // native_method_throw_unsatisfied_link_error_entry() should only
1033 // be passed when post_event_flag is false.
1034 assert(function !=
1035 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1036 "post_event_flag mismatch");
1037
1038 // post the bind event, and possible change the bind function
1039 JvmtiExport::post_native_method_bind(this, &function);
1040 }
1041 *native_function = function;
1042 // This function can be called more than once. We must make sure that we always
1043 // use the latest registered method -> check if a stub already has been generated.
1044 // If so, we have to make it not_entrant.
1045 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1046 if (nm != nullptr) {
1047 nm->make_not_entrant();
1048 }
1049 }
1050
1051
1052 bool Method::has_native_function() const {
1053 if (is_special_native_intrinsic())
1054 return false; // special-cased in SharedRuntime::generate_native_wrapper
1055 address func = native_function();
1056 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1057 }
1058
1059
1060 void Method::clear_native_function() {
1061 // Note: is_method_handle_intrinsic() is allowed here.
1062 set_native_function(
1063 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1064 !native_bind_event_is_interesting);
1065 this->unlink_code();
1066 }
1067
1068
1069 void Method::set_signature_handler(address handler) {
1070 address* signature_handler = signature_handler_addr();
1071 *signature_handler = handler;
1072 }
1073
1074
1075 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1076 assert(reason != nullptr, "must provide a reason");
1077 if (PrintCompilation && report) {
1078 ttyLocker ttyl;
1079 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1080 if (comp_level == CompLevel_all) {
1081 tty->print("all levels ");
1082 } else {
1083 tty->print("level %d ", comp_level);
1084 }
1085 this->print_short_name(tty);
1086 int size = this->code_size();
1087 if (size > 0) {
1088 tty->print(" (%d bytes)", size);
1089 }
1090 if (reason != nullptr) {
1091 tty->print(" %s", reason);
1092 }
1093 tty->cr();
1094 }
1095 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1096 ttyLocker ttyl;
1097 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
1098 os::current_thread_id(), is_osr, comp_level);
1099 if (reason != nullptr) {
1100 xtty->print(" reason=\'%s\'", reason);
1101 }
1102 xtty->method(this);
1103 xtty->stamp();
1104 xtty->end_elem();
1105 }
1106 }
1107
1108 bool Method::is_always_compilable() const {
1109 // Generated adapters must be compiled
1110 if (is_special_native_intrinsic() && is_synthetic()) {
1111 assert(!is_not_c1_compilable(), "sanity check");
1112 assert(!is_not_c2_compilable(), "sanity check");
1113 return true;
1114 }
1115
1116 return false;
1117 }
1118
1119 bool Method::is_not_compilable(int comp_level) const {
1120 if (number_of_breakpoints() > 0)
1121 return true;
1122 if (is_always_compilable())
1123 return false;
1124 if (comp_level == CompLevel_any)
1125 return is_not_c1_compilable() && is_not_c2_compilable();
1126 if (is_c1_compile(comp_level))
1127 return is_not_c1_compilable();
1128 if (is_c2_compile(comp_level))
1129 return is_not_c2_compilable();
1130 return false;
1131 }
1132
1133 // call this when compiler finds that this method is not compilable
1134 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1135 if (is_always_compilable()) {
1136 // Don't mark a method which should be always compilable
1137 return;
1138 }
1139 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1140 if (comp_level == CompLevel_all) {
1141 set_is_not_c1_compilable();
1142 set_is_not_c2_compilable();
1143 } else {
1144 if (is_c1_compile(comp_level))
1145 set_is_not_c1_compilable();
1146 if (is_c2_compile(comp_level))
1147 set_is_not_c2_compilable();
1148 }
1149 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1150 }
1151
1152 bool Method::is_not_osr_compilable(int comp_level) const {
1153 if (is_not_compilable(comp_level))
1154 return true;
1155 if (comp_level == CompLevel_any)
1156 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1157 if (is_c1_compile(comp_level))
1158 return is_not_c1_osr_compilable();
1159 if (is_c2_compile(comp_level))
1160 return is_not_c2_osr_compilable();
1161 return false;
1162 }
1163
1164 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1165 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1166 if (comp_level == CompLevel_all) {
1167 set_is_not_c1_osr_compilable();
1168 set_is_not_c2_osr_compilable();
1169 } else {
1170 if (is_c1_compile(comp_level))
1171 set_is_not_c1_osr_compilable();
1172 if (is_c2_compile(comp_level))
1173 set_is_not_c2_osr_compilable();
1174 }
1175 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1176 }
1177
1178 // Revert to using the interpreter and clear out the nmethod
1179 void Method::clear_code() {
1180 // this may be null if c2i adapters have not been made yet
1181 // Only should happen at allocate time.
1182 if (adapter() == nullptr) {
1183 _from_compiled_entry = nullptr;
1184 } else {
1185 _from_compiled_entry = adapter()->get_c2i_entry();
1186 }
1187 OrderAccess::storestore();
1188 _from_interpreted_entry = _i2i_entry;
1189 OrderAccess::storestore();
1190 _code = nullptr;
1191 }
1192
1193 void Method::unlink_code(nmethod *compare) {
1194 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1195 // We need to check if either the _code or _from_compiled_code_entry_point
1196 // refer to this nmethod because there is a race in setting these two fields
1197 // in Method* as seen in bugid 4947125.
1198 if (code() == compare ||
1199 from_compiled_entry() == compare->verified_entry_point()) {
1200 clear_code();
1201 }
1202 }
1203
1204 void Method::unlink_code() {
1205 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1206 clear_code();
1207 }
1208
1209 #if INCLUDE_CDS
1210 // Called by class data sharing to remove any entry points (which are not shared)
1211 void Method::unlink_method() {
1212 assert(CDSConfig::is_dumping_archive(), "sanity");
1213 _code = nullptr;
1214 _adapter = nullptr;
1215 _i2i_entry = nullptr;
1216 _from_compiled_entry = nullptr;
1217 _from_interpreted_entry = nullptr;
1218
1219 if (is_native()) {
1220 *native_function_addr() = nullptr;
1221 set_signature_handler(nullptr);
1222 }
1223 NOT_PRODUCT(set_compiled_invocation_count(0);)
1224
1225 clear_method_data();
1226 clear_method_counters();
1227 clear_is_not_c1_compilable();
1228 clear_is_not_c1_osr_compilable();
1229 clear_is_not_c2_compilable();
1230 clear_is_not_c2_osr_compilable();
1231 clear_queued_for_compilation();
1232 set_pending_queue_processed(false);
1233 remove_unshareable_flags();
1234 }
1235
1236 void Method::remove_unshareable_flags() {
1237 // clear all the flags that shouldn't be in the archived version
1238 assert(!is_old(), "must be");
1239 assert(!is_obsolete(), "must be");
1240 assert(!is_deleted(), "must be");
1241
1242 set_is_prefixed_native(false);
1243 set_queued_for_compilation(false);
1244 set_pending_queue_processed(false);
1245 set_is_not_c2_compilable(false);
1246 set_is_not_c1_compilable(false);
1247 set_is_not_c2_osr_compilable(false);
1248 set_on_stack_flag(false);
1249 }
1250 #endif
1251
1252 // Called when the method_holder is getting linked. Setup entrypoints so the method
1253 // is ready to be called from interpreter, compiler, and vtables.
1254 void Method::link_method(const methodHandle& h_method, TRAPS) {
1255 if (log_is_enabled(Info, perf, class, link)) {
1256 ClassLoader::perf_ik_link_methods_count()->inc();
1257 }
1258
1259 // If the code cache is full, we may reenter this function for the
1260 // leftover methods that weren't linked.
1261 if (adapter() != nullptr) {
1262 return;
1263 }
1264 assert( _code == nullptr, "nothing compiled yet" );
1265
1266 // Setup interpreter entrypoint
1267 assert(this == h_method(), "wrong h_method()" );
1268
1269 assert(adapter() == nullptr, "init'd to null");
1270 address entry = Interpreter::entry_for_method(h_method);
1271 assert(entry != nullptr, "interpreter entry must be non-null");
1272 // Sets both _i2i_entry and _from_interpreted_entry
1273 set_interpreter_entry(entry);
1274
1275 // Don't overwrite already registered native entries.
1276 if (is_native() && !has_native_function()) {
1277 set_native_function(
1278 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1279 !native_bind_event_is_interesting);
1280 }
1281
1282 // Setup compiler entrypoint. This is made eagerly, so we do not need
1283 // special handling of vtables. An alternative is to make adapters more
1284 // lazily by calling make_adapter() from from_compiled_entry() for the
1285 // normal calls. For vtable calls life gets more complicated. When a
1286 // call-site goes mega-morphic we need adapters in all methods which can be
1287 // called from the vtable. We need adapters on such methods that get loaded
1288 // later. Ditto for mega-morphic itable calls. If this proves to be a
1289 // problem we'll make these lazily later.
1290 (void) make_adapters(h_method, CHECK);
1291
1292 // ONLY USE the h_method now as make_adapter may have blocked
1293
1294 if (h_method->is_continuation_native_intrinsic()) {
1295 _from_interpreted_entry = nullptr;
1296 _from_compiled_entry = nullptr;
1297 _i2i_entry = nullptr;
1298 if (Continuations::enabled()) {
1299 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1300 AdapterHandlerLibrary::create_native_wrapper(h_method);
1301 if (!h_method->has_compiled_code()) {
1302 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1303 }
1304 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1305 }
1306 }
1307 if (_preload_code != nullptr) {
1308 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1309 set_code(h_method, _preload_code);
1310 assert(((nmethod*)_preload_code)->scc_entry() == _scc_entry, "sanity");
1311 }
1312 }
1313
1314 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1315 PerfTraceElapsedTime timer(ClassLoader::perf_method_adapters_time());
1316
1317 // Adapters for compiled code are made eagerly here. They are fairly
1318 // small (generally < 100 bytes) and quick to make (and cached and shared)
1319 // so making them eagerly shouldn't be too expensive.
1320 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1321 if (adapter == nullptr ) {
1322 if (!is_init_completed()) {
1323 // Don't throw exceptions during VM initialization because java.lang.* classes
1324 // might not have been initialized, causing problems when constructing the
1325 // Java exception object.
1326 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1327 } else {
1328 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1329 }
1330 }
1331
1332 mh->set_adapter_entry(adapter);
1333 mh->_from_compiled_entry = adapter->get_c2i_entry();
1334 return adapter->get_c2i_entry();
1335 }
1336
1337 // The verified_code_entry() must be called when a invoke is resolved
1338 // on this method.
1339
1340 // It returns the compiled code entry point, after asserting not null.
1341 // This function is called after potential safepoints so that nmethod
1342 // or adapter that it points to is still live and valid.
1343 // This function must not hit a safepoint!
1344 address Method::verified_code_entry() {
1345 debug_only(NoSafepointVerifier nsv;)
1346 assert(_from_compiled_entry != nullptr, "must be set");
1347 return _from_compiled_entry;
1348 }
1349
1350 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1351 // (could be racing a deopt).
1352 // Not inline to avoid circular ref.
1353 bool Method::check_code() const {
1354 // cached in a register or local. There's a race on the value of the field.
1355 nmethod *code = Atomic::load_acquire(&_code);
1356 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1357 }
1358
1359 // Install compiled code. Instantly it can execute.
1360 void Method::set_code(const methodHandle& mh, nmethod *code) {
1361 assert_lock_strong(NMethodState_lock);
1362 assert( code, "use clear_code to remove code" );
1363 assert( mh->check_code(), "" );
1364
1365 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1366
1367 // These writes must happen in this order, because the interpreter will
1368 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1369 // which jumps to _from_compiled_entry.
1370 mh->_code = code; // Assign before allowing compiled code to exec
1371
1372 int comp_level = code->comp_level();
1373 // In theory there could be a race here. In practice it is unlikely
1374 // and not worth worrying about.
1375 if (comp_level > mh->highest_comp_level()) {
1376 mh->set_highest_comp_level(comp_level);
1377 }
1378
1379 OrderAccess::storestore();
1380 mh->_from_compiled_entry = code->verified_entry_point();
1381 OrderAccess::storestore();
1382
1383 if (mh->is_continuation_native_intrinsic()) {
1384 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1385
1386 if (mh->is_continuation_enter_intrinsic()) {
1387 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1388 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1389 } else if (mh->is_continuation_yield_intrinsic()) {
1390 mh->_i2i_entry = mh->get_i2c_entry();
1391 } else {
1392 guarantee(false, "Unknown Continuation native intrinsic");
1393 }
1394 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1395 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1396 } else if (!mh->is_method_handle_intrinsic()) {
1397 // Instantly compiled code can execute.
1398 mh->_from_interpreted_entry = mh->get_i2c_entry();
1399 }
1400 }
1401
1402
1403 bool Method::is_overridden_in(Klass* k) const {
1404 InstanceKlass* ik = InstanceKlass::cast(k);
1405
1406 if (ik->is_interface()) return false;
1407
1408 // If method is an interface, we skip it - except if it
1409 // is a miranda method
1410 if (method_holder()->is_interface()) {
1411 // Check that method is not a miranda method
1412 if (ik->lookup_method(name(), signature()) == nullptr) {
1413 // No implementation exist - so miranda method
1414 return false;
1415 }
1416 return true;
1417 }
1418
1419 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1420 if (!has_vtable_index()) {
1421 return false;
1422 } else {
1423 Method* vt_m = ik->method_at_vtable(vtable_index());
1424 return vt_m != this;
1425 }
1426 }
1427
1428
1429 // give advice about whether this Method* should be cached or not
1430 bool Method::should_not_be_cached() const {
1431 if (is_old()) {
1432 // This method has been redefined. It is either EMCP or obsolete
1433 // and we don't want to cache it because that would pin the method
1434 // down and prevent it from being collectible if and when it
1435 // finishes executing.
1436 return true;
1437 }
1438
1439 // caching this method should be just fine
1440 return false;
1441 }
1442
1443
1444 /**
1445 * Returns true if this is one of the specially treated methods for
1446 * security related stack walks (like Reflection.getCallerClass).
1447 */
1448 bool Method::is_ignored_by_security_stack_walk() const {
1449 if (intrinsic_id() == vmIntrinsics::_invoke) {
1450 // This is Method.invoke() -- ignore it
1451 return true;
1452 }
1453 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1454 // This is an auxiliary frame -- ignore it
1455 return true;
1456 }
1457 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1458 // This is an internal adapter frame for method handles -- ignore it
1459 return true;
1460 }
1461 return false;
1462 }
1463
1464
1465 // Constant pool structure for invoke methods:
1466 enum {
1467 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1468 _imcp_invoke_signature, // utf8: (variable Symbol*)
1469 _imcp_limit
1470 };
1471
1472 // Test if this method is an MH adapter frame generated by Java code.
1473 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1474 bool Method::is_compiled_lambda_form() const {
1475 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1476 }
1477
1478 // Test if this method is an internal MH primitive method.
1479 bool Method::is_method_handle_intrinsic() const {
1480 vmIntrinsics::ID iid = intrinsic_id();
1481 return (MethodHandles::is_signature_polymorphic(iid) &&
1482 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1483 }
1484
1485 bool Method::has_member_arg() const {
1486 vmIntrinsics::ID iid = intrinsic_id();
1487 return (MethodHandles::is_signature_polymorphic(iid) &&
1488 MethodHandles::has_member_arg(iid));
1489 }
1490
1491 // Make an instance of a signature-polymorphic internal MH primitive.
1492 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1493 Symbol* signature,
1494 TRAPS) {
1495 ResourceMark rm(THREAD);
1496 methodHandle empty;
1497
1498 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1499 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1500 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1501
1502 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1503
1504 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1505 name->increment_refcount();
1506 signature->increment_refcount();
1507
1508 int cp_length = _imcp_limit;
1509 ClassLoaderData* loader_data = holder->class_loader_data();
1510 constantPoolHandle cp;
1511 {
1512 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1513 cp = constantPoolHandle(THREAD, cp_oop);
1514 }
1515 cp->copy_fields(holder->constants());
1516 cp->set_pool_holder(holder);
1517 cp->symbol_at_put(_imcp_invoke_name, name);
1518 cp->symbol_at_put(_imcp_invoke_signature, signature);
1519 cp->set_has_preresolution();
1520 cp->set_is_for_method_handle_intrinsic();
1521
1522 // decide on access bits: public or not?
1523 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1524 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1525 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1526 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1527
1528 methodHandle m;
1529 {
1530 InlineTableSizes sizes;
1531 Method* m_oop = Method::allocate(loader_data, 0,
1532 accessFlags_from(flags_bits), &sizes,
1533 ConstMethod::NORMAL,
1534 name,
1535 CHECK_(empty));
1536 m = methodHandle(THREAD, m_oop);
1537 }
1538 m->set_constants(cp());
1539 m->set_name_index(_imcp_invoke_name);
1540 m->set_signature_index(_imcp_invoke_signature);
1541 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1542 assert(m->signature() == signature, "");
1543 m->constMethod()->compute_from_signature(signature, must_be_static);
1544 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1545 assert(m->is_method_handle_intrinsic(), "");
1546 #ifdef ASSERT
1547 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1548 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1549 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1550 #endif //ASSERT
1551
1552 // Finally, set up its entry points.
1553 assert(m->can_be_statically_bound(), "");
1554 m->set_vtable_index(Method::nonvirtual_vtable_index);
1555 m->link_method(m, CHECK_(empty));
1556
1557 if (iid == vmIntrinsics::_linkToNative) {
1558 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1559 }
1560 if (log_is_enabled(Debug, methodhandles)) {
1561 LogTarget(Debug, methodhandles) lt;
1562 LogStream ls(lt);
1563 m->print_on(&ls);
1564 }
1565
1566 return m;
1567 }
1568
1569 #if INCLUDE_CDS
1570 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1571 m->link_method(m, CHECK);
1572
1573 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1574 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1575 }
1576 }
1577 #endif
1578
1579 Klass* Method::check_non_bcp_klass(Klass* klass) {
1580 if (klass != nullptr && klass->class_loader() != nullptr) {
1581 if (klass->is_objArray_klass())
1582 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1583 return klass;
1584 }
1585 return nullptr;
1586 }
1587
1588
1589 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1590 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1591 // Code below does not work for native methods - they should never get rewritten anyway
1592 assert(!m->is_native(), "cannot rewrite native methods");
1593 // Allocate new Method*
1594 AccessFlags flags = m->access_flags();
1595
1596 ConstMethod* cm = m->constMethod();
1597 int checked_exceptions_len = cm->checked_exceptions_length();
1598 int localvariable_len = cm->localvariable_table_length();
1599 int exception_table_len = cm->exception_table_length();
1600 int method_parameters_len = cm->method_parameters_length();
1601 int method_annotations_len = cm->method_annotations_length();
1602 int parameter_annotations_len = cm->parameter_annotations_length();
1603 int type_annotations_len = cm->type_annotations_length();
1604 int default_annotations_len = cm->default_annotations_length();
1605
1606 InlineTableSizes sizes(
1607 localvariable_len,
1608 new_compressed_linenumber_size,
1609 exception_table_len,
1610 checked_exceptions_len,
1611 method_parameters_len,
1612 cm->generic_signature_index(),
1613 method_annotations_len,
1614 parameter_annotations_len,
1615 type_annotations_len,
1616 default_annotations_len,
1617 0);
1618
1619 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1620 Method* newm_oop = Method::allocate(loader_data,
1621 new_code_length,
1622 flags,
1623 &sizes,
1624 m->method_type(),
1625 m->name(),
1626 CHECK_(methodHandle()));
1627 methodHandle newm (THREAD, newm_oop);
1628
1629 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1630 ConstMethod* newcm = newm->constMethod();
1631 int new_const_method_size = newm->constMethod()->size();
1632
1633 // This works because the source and target are both Methods. Some compilers
1634 // (e.g., clang) complain that the target vtable pointer will be stomped,
1635 // so cast away newm()'s and m()'s Methodness.
1636 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1637
1638 // Create shallow copy of ConstMethod.
1639 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1640
1641 // Reset correct method/const method, method size, and parameter info
1642 newm->set_constMethod(newcm);
1643 newm->constMethod()->set_code_size(new_code_length);
1644 newm->constMethod()->set_constMethod_size(new_const_method_size);
1645 assert(newm->code_size() == new_code_length, "check");
1646 assert(newm->method_parameters_length() == method_parameters_len, "check");
1647 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1648 assert(newm->exception_table_length() == exception_table_len, "check");
1649 assert(newm->localvariable_table_length() == localvariable_len, "check");
1650 // Copy new byte codes
1651 memcpy(newm->code_base(), new_code, new_code_length);
1652 // Copy line number table
1653 if (new_compressed_linenumber_size > 0) {
1654 memcpy(newm->compressed_linenumber_table(),
1655 new_compressed_linenumber_table,
1656 new_compressed_linenumber_size);
1657 }
1658 // Copy method_parameters
1659 if (method_parameters_len > 0) {
1660 memcpy(newm->method_parameters_start(),
1661 m->method_parameters_start(),
1662 method_parameters_len * sizeof(MethodParametersElement));
1663 }
1664 // Copy checked_exceptions
1665 if (checked_exceptions_len > 0) {
1666 memcpy(newm->checked_exceptions_start(),
1667 m->checked_exceptions_start(),
1668 checked_exceptions_len * sizeof(CheckedExceptionElement));
1669 }
1670 // Copy exception table
1671 if (exception_table_len > 0) {
1672 memcpy(newm->exception_table_start(),
1673 m->exception_table_start(),
1674 exception_table_len * sizeof(ExceptionTableElement));
1675 }
1676 // Copy local variable number table
1677 if (localvariable_len > 0) {
1678 memcpy(newm->localvariable_table_start(),
1679 m->localvariable_table_start(),
1680 localvariable_len * sizeof(LocalVariableTableElement));
1681 }
1682 // Copy stackmap table
1683 if (m->has_stackmap_table()) {
1684 int code_attribute_length = m->stackmap_data()->length();
1685 Array<u1>* stackmap_data =
1686 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1687 memcpy((void*)stackmap_data->adr_at(0),
1688 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1689 newm->set_stackmap_data(stackmap_data);
1690 }
1691
1692 // copy annotations over to new method
1693 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1694 return newm;
1695 }
1696
1697 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1698 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1699 // because we are not loading from core libraries
1700 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1701 // which does not use the class default class loader so we check for its loader here
1702 const InstanceKlass* ik = InstanceKlass::cast(holder);
1703 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1704 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1705 }
1706
1707 // see if the klass name is well-known:
1708 Symbol* klass_name = ik->name();
1709 vmSymbolID id = vmSymbols::find_sid(klass_name);
1710 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1711 return id;
1712 } else {
1713 return vmSymbolID::NO_SID;
1714 }
1715 }
1716
1717 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1718 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1719 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1720 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1721 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1722
1723 // the klass name is well-known:
1724 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1725 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1726
1727 // ditto for method and signature:
1728 vmSymbolID name_id = vmSymbols::find_sid(name());
1729 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1730 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1731 && name_id == vmSymbolID::NO_SID) {
1732 return;
1733 }
1734 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1735 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1736 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1737 && sig_id == vmSymbolID::NO_SID) {
1738 return;
1739 }
1740 jshort flags = access_flags().as_short();
1741
1742 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1743 if (id != vmIntrinsics::_none) {
1744 set_intrinsic_id(id);
1745 if (id == vmIntrinsics::_Class_cast) {
1746 // Even if the intrinsic is rejected, we want to inline this simple method.
1747 set_force_inline();
1748 }
1749 return;
1750 }
1751
1752 // A few slightly irregular cases:
1753 switch (klass_id) {
1754 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1755 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1756 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1757 if (!is_native()) break;
1758 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1759 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1760 id = vmIntrinsics::_none;
1761 break;
1762
1763 default:
1764 break;
1765 }
1766
1767 if (id != vmIntrinsics::_none) {
1768 // Set up its iid. It is an alias method.
1769 set_intrinsic_id(id);
1770 return;
1771 }
1772 }
1773
1774 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1775 if (!THREAD->can_call_java()) {
1776 // There is nothing useful this routine can do from within the Compile thread.
1777 // Hopefully, the signature contains only well-known classes.
1778 // We could scan for this and return true/false, but the caller won't care.
1779 return false;
1780 }
1781 bool sig_is_loaded = true;
1782 ResourceMark rm(THREAD);
1783 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1784 if (ss.is_reference()) {
1785 // load everything, including arrays "[Lfoo;"
1786 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1787 // We are loading classes eagerly. If a ClassNotFoundException or
1788 // a LinkageError was generated, be sure to ignore it.
1789 if (HAS_PENDING_EXCEPTION) {
1790 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1791 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1792 CLEAR_PENDING_EXCEPTION;
1793 } else {
1794 return false;
1795 }
1796 }
1797 if( klass == nullptr) { sig_is_loaded = false; }
1798 }
1799 }
1800 return sig_is_loaded;
1801 }
1802
1803 // Exposed so field engineers can debug VM
1804 void Method::print_short_name(outputStream* st) const {
1805 ResourceMark rm;
1806 #ifdef PRODUCT
1807 st->print(" %s::", method_holder()->external_name());
1808 #else
1809 st->print(" %s::", method_holder()->internal_name());
1810 #endif
1811 name()->print_symbol_on(st);
1812 if (WizardMode) signature()->print_symbol_on(st);
1813 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1814 MethodHandles::print_as_basic_type_signature_on(st, signature());
1815 }
1816
1817 // Comparer for sorting an object array containing
1818 // Method*s.
1819 static int method_comparator(Method* a, Method* b) {
1820 return a->name()->fast_compare(b->name());
1821 }
1822
1823 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1824 // default_methods also uses this without the ordering for fast find_method
1825 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1826 int length = methods->length();
1827 if (length > 1) {
1828 if (func == nullptr) {
1829 func = method_comparator;
1830 }
1831 {
1832 NoSafepointVerifier nsv;
1833 QuickSort::sort(methods->data(), length, func);
1834 }
1835 // Reset method ordering
1836 if (set_idnums) {
1837 for (u2 i = 0; i < length; i++) {
1838 Method* m = methods->at(i);
1839 m->set_method_idnum(i);
1840 m->set_orig_method_idnum(i);
1841 }
1842 }
1843 }
1844 }
1845
1846 //-----------------------------------------------------------------------------------
1847 // Non-product code unless JVM/TI needs it
1848
1849 #if !defined(PRODUCT) || INCLUDE_JVMTI
1850 class SignatureTypePrinter : public SignatureTypeNames {
1851 private:
1852 outputStream* _st;
1853 bool _use_separator;
1854
1855 void type_name(const char* name) {
1856 if (_use_separator) _st->print(", ");
1857 _st->print("%s", name);
1858 _use_separator = true;
1859 }
1860
1861 public:
1862 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1863 _st = st;
1864 _use_separator = false;
1865 }
1866
1867 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1868 void print_returntype() { _use_separator = false; do_type(return_type()); }
1869 };
1870
1871
1872 void Method::print_name(outputStream* st) const {
1873 Thread *thread = Thread::current();
1874 ResourceMark rm(thread);
1875 st->print("%s ", is_static() ? "static" : "virtual");
1876 if (WizardMode) {
1877 st->print("%s.", method_holder()->internal_name());
1878 name()->print_symbol_on(st);
1879 signature()->print_symbol_on(st);
1880 } else {
1881 SignatureTypePrinter sig(signature(), st);
1882 sig.print_returntype();
1883 st->print(" %s.", method_holder()->internal_name());
1884 name()->print_symbol_on(st);
1885 st->print("(");
1886 sig.print_parameters();
1887 st->print(")");
1888 }
1889 }
1890 #endif // !PRODUCT || INCLUDE_JVMTI
1891
1892
1893 void Method::print_codes_on(outputStream* st, int flags) const {
1894 print_codes_on(0, code_size(), st, flags);
1895 }
1896
1897 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1898 Thread *thread = Thread::current();
1899 ResourceMark rm(thread);
1900 methodHandle mh (thread, (Method*)this);
1901 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1902 }
1903
1904 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1905 _bci = 0;
1906 _line = 0;
1907 };
1908
1909 bool CompressedLineNumberReadStream::read_pair() {
1910 jubyte next = read_byte();
1911 // Check for terminator
1912 if (next == 0) return false;
1913 if (next == 0xFF) {
1914 // Escape character, regular compression used
1915 _bci += read_signed_int();
1916 _line += read_signed_int();
1917 } else {
1918 // Single byte compression used
1919 _bci += next >> 3;
1920 _line += next & 0x7;
1921 }
1922 return true;
1923 }
1924
1925 #if INCLUDE_JVMTI
1926
1927 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1928 BreakpointInfo* bp = method_holder()->breakpoints();
1929 for (; bp != nullptr; bp = bp->next()) {
1930 if (bp->match(this, bci)) {
1931 return bp->orig_bytecode();
1932 }
1933 }
1934 {
1935 ResourceMark rm;
1936 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1937 }
1938 return Bytecodes::_shouldnotreachhere;
1939 }
1940
1941 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1942 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1943 BreakpointInfo* bp = method_holder()->breakpoints();
1944 for (; bp != nullptr; bp = bp->next()) {
1945 if (bp->match(this, bci)) {
1946 bp->set_orig_bytecode(code);
1947 // and continue, in case there is more than one
1948 }
1949 }
1950 }
1951
1952 void Method::set_breakpoint(int bci) {
1953 InstanceKlass* ik = method_holder();
1954 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1955 bp->set_next(ik->breakpoints());
1956 ik->set_breakpoints(bp);
1957 // do this last:
1958 bp->set(this);
1959 }
1960
1961 static void clear_matches(Method* m, int bci) {
1962 InstanceKlass* ik = m->method_holder();
1963 BreakpointInfo* prev_bp = nullptr;
1964 BreakpointInfo* next_bp;
1965 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1966 next_bp = bp->next();
1967 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1968 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1969 // do this first:
1970 bp->clear(m);
1971 // unhook it
1972 if (prev_bp != nullptr)
1973 prev_bp->set_next(next_bp);
1974 else
1975 ik->set_breakpoints(next_bp);
1976 delete bp;
1977 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1978 // at same location. So we have multiple matching (method_index and bci)
1979 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1980 // breakpoint for clear_breakpoint request and keep all other method versions
1981 // BreakpointInfo for future clear_breakpoint request.
1982 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1983 // which is being called when class is unloaded. We delete all the Breakpoint
1984 // information for all versions of method. We may not correctly restore the original
1985 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1986 // so these methods won't be used anymore.
1987 if (bci >= 0) {
1988 break;
1989 }
1990 } else {
1991 // This one is a keeper.
1992 prev_bp = bp;
1993 }
1994 }
1995 }
1996
1997 void Method::clear_breakpoint(int bci) {
1998 assert(bci >= 0, "");
1999 clear_matches(this, bci);
2000 }
2001
2002 void Method::clear_all_breakpoints() {
2003 clear_matches(this, -1);
2004 }
2005
2006 #endif // INCLUDE_JVMTI
2007
2008 int Method::invocation_count() const {
2009 MethodCounters* mcs = method_counters();
2010 MethodData* mdo = method_data();
2011 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) ||
2012 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) {
2013 return InvocationCounter::count_limit;
2014 } else {
2015 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) +
2016 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0);
2017 }
2018 }
2019
2020 int Method::backedge_count() const {
2021 MethodCounters* mcs = method_counters();
2022 MethodData* mdo = method_data();
2023 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) ||
2024 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) {
2025 return InvocationCounter::count_limit;
2026 } else {
2027 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) +
2028 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0);
2029 }
2030 }
2031
2032 int Method::highest_comp_level() const {
2033 const MethodCounters* mcs = method_counters();
2034 nmethod* nm = code();
2035 int level = (nm != nullptr) ? nm->comp_level() : CompLevel_none;
2036 if (mcs != nullptr) {
2037 return MAX2(mcs->highest_comp_level(), level);
2038 } else {
2039 return CompLevel_none;
2040 }
2041 }
2042
2043 int Method::highest_osr_comp_level() const {
2044 const MethodCounters* mcs = method_counters();
2045 if (mcs != nullptr) {
2046 return mcs->highest_osr_comp_level();
2047 } else {
2048 return CompLevel_none;
2049 }
2050 }
2051
2052 void Method::set_highest_comp_level(int level) {
2053 MethodCounters* mcs = method_counters();
2054 if (mcs != nullptr) {
2055 mcs->set_highest_comp_level(level);
2056 }
2057 }
2058
2059 void Method::set_highest_osr_comp_level(int level) {
2060 MethodCounters* mcs = method_counters();
2061 if (mcs != nullptr) {
2062 mcs->set_highest_osr_comp_level(level);
2063 }
2064 }
2065
2066 #if INCLUDE_JVMTI
2067
2068 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2069 _bci = bci;
2070 _name_index = m->name_index();
2071 _signature_index = m->signature_index();
2072 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2073 if (_orig_bytecode == Bytecodes::_breakpoint)
2074 _orig_bytecode = m->orig_bytecode_at(_bci);
2075 _next = nullptr;
2076 }
2077
2078 void BreakpointInfo::set(Method* method) {
2079 #ifdef ASSERT
2080 {
2081 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2082 if (code == Bytecodes::_breakpoint)
2083 code = method->orig_bytecode_at(_bci);
2084 assert(orig_bytecode() == code, "original bytecode must be the same");
2085 }
2086 #endif
2087 Thread *thread = Thread::current();
2088 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2089 method->incr_number_of_breakpoints(thread);
2090 {
2091 // Deoptimize all dependents on this method
2092 HandleMark hm(thread);
2093 methodHandle mh(thread, method);
2094 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2095 }
2096 }
2097
2098 void BreakpointInfo::clear(Method* method) {
2099 *method->bcp_from(_bci) = orig_bytecode();
2100 assert(method->number_of_breakpoints() > 0, "must not go negative");
2101 method->decr_number_of_breakpoints(Thread::current());
2102 }
2103
2104 #endif // INCLUDE_JVMTI
2105
2106 // jmethodID handling
2107
2108 // This is a block allocating object, sort of like JNIHandleBlock, only a
2109 // lot simpler.
2110 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2111 // never get rid of it.
2112
2113 static const int min_block_size = 8;
2114
2115 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2116 friend class JNIMethodBlock;
2117 Method** _methods;
2118 int _number_of_methods;
2119 int _top;
2120 JNIMethodBlockNode* _next;
2121
2122 public:
2123
2124 JNIMethodBlockNode(int num_methods = min_block_size);
2125
2126 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2127
2128 void ensure_methods(int num_addl_methods) {
2129 if (_top < _number_of_methods) {
2130 num_addl_methods -= _number_of_methods - _top;
2131 if (num_addl_methods <= 0) {
2132 return;
2133 }
2134 }
2135 if (_next == nullptr) {
2136 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2137 } else {
2138 _next->ensure_methods(num_addl_methods);
2139 }
2140 }
2141 };
2142
2143 class JNIMethodBlock : public CHeapObj<mtClass> {
2144 JNIMethodBlockNode _head;
2145 JNIMethodBlockNode *_last_free;
2146 public:
2147 static Method* const _free_method;
2148
2149 JNIMethodBlock(int initial_capacity = min_block_size)
2150 : _head(initial_capacity), _last_free(&_head) {}
2151
2152 void ensure_methods(int num_addl_methods) {
2153 _last_free->ensure_methods(num_addl_methods);
2154 }
2155
2156 Method** add_method(Method* m) {
2157 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2158 if (b->_top < b->_number_of_methods) {
2159 // top points to the next free entry.
2160 int i = b->_top;
2161 b->_methods[i] = m;
2162 b->_top++;
2163 _last_free = b;
2164 return &(b->_methods[i]);
2165 } else if (b->_top == b->_number_of_methods) {
2166 // if the next free entry ran off the block see if there's a free entry
2167 for (int i = 0; i < b->_number_of_methods; i++) {
2168 if (b->_methods[i] == _free_method) {
2169 b->_methods[i] = m;
2170 _last_free = b;
2171 return &(b->_methods[i]);
2172 }
2173 }
2174 // Only check each block once for frees. They're very unlikely.
2175 // Increment top past the end of the block.
2176 b->_top++;
2177 }
2178 // need to allocate a next block.
2179 if (b->_next == nullptr) {
2180 b->_next = _last_free = new JNIMethodBlockNode();
2181 }
2182 }
2183 guarantee(false, "Should always allocate a free block");
2184 return nullptr;
2185 }
2186
2187 bool contains(Method** m) {
2188 if (m == nullptr) return false;
2189 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2190 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2191 // This is a bit of extra checking, for two reasons. One is
2192 // that contains() deals with pointers that are passed in by
2193 // JNI code, so making sure that the pointer is aligned
2194 // correctly is valuable. The other is that <= and > are
2195 // technically not defined on pointers, so the if guard can
2196 // pass spuriously; no modern compiler is likely to make that
2197 // a problem, though (and if one did, the guard could also
2198 // fail spuriously, which would be bad).
2199 ptrdiff_t idx = m - b->_methods;
2200 if (b->_methods + idx == m) {
2201 return true;
2202 }
2203 }
2204 }
2205 return false; // not found
2206 }
2207
2208 // During class unloading the methods are cleared, which is different
2209 // than freed.
2210 void clear_all_methods() {
2211 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2212 for (int i = 0; i< b->_number_of_methods; i++) {
2213 b->_methods[i] = nullptr;
2214 }
2215 }
2216 }
2217 #ifndef PRODUCT
2218 int count_methods() {
2219 // count all allocated methods
2220 int count = 0;
2221 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2222 for (int i = 0; i< b->_number_of_methods; i++) {
2223 if (b->_methods[i] != _free_method) count++;
2224 }
2225 }
2226 return count;
2227 }
2228 #endif // PRODUCT
2229 };
2230
2231 // Something that can't be mistaken for an address or a markWord
2232 Method* const JNIMethodBlock::_free_method = (Method*)55;
2233
2234 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2235 _number_of_methods = MAX2(num_methods, min_block_size);
2236 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2237 for (int i = 0; i < _number_of_methods; i++) {
2238 _methods[i] = JNIMethodBlock::_free_method;
2239 }
2240 }
2241
2242 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2243 // Have to add jmethod_ids() to class loader data thread-safely.
2244 // Also have to add the method to the list safely, which the lock
2245 // protects as well.
2246 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2247 if (cld->jmethod_ids() == nullptr) {
2248 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2249 } else {
2250 cld->jmethod_ids()->ensure_methods(capacity);
2251 }
2252 }
2253
2254 // Add a method id to the jmethod_ids
2255 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2256 // Have to add jmethod_ids() to class loader data thread-safely.
2257 // Also have to add the method to the list safely, which the lock
2258 // protects as well.
2259 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2260
2261 ResourceMark rm;
2262 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name());
2263 if (cld->jmethod_ids() == nullptr) {
2264 cld->set_jmethod_ids(new JNIMethodBlock());
2265 }
2266 // jmethodID is a pointer to Method*
2267 return (jmethodID)cld->jmethod_ids()->add_method(m);
2268 }
2269
2270 jmethodID Method::jmethod_id() {
2271 methodHandle mh(Thread::current(), this);
2272 return method_holder()->get_jmethod_id(mh);
2273 }
2274
2275 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2276 // Can't assert the method_holder is the same because the new method has the
2277 // scratch method holder.
2278 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2279 == new_method->method_holder()->class_loader() ||
2280 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2281 "changing to a different class loader");
2282 // Just change the method in place, jmethodID pointer doesn't change.
2283 *((Method**)jmid) = new_method;
2284 }
2285
2286 bool Method::is_method_id(jmethodID mid) {
2287 Method* m = resolve_jmethod_id(mid);
2288 assert(m != nullptr, "should be called with non-null method");
2289 InstanceKlass* ik = m->method_holder();
2290 ClassLoaderData* cld = ik->class_loader_data();
2291 if (cld->jmethod_ids() == nullptr) return false;
2292 return (cld->jmethod_ids()->contains((Method**)mid));
2293 }
2294
2295 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2296 if (mid == nullptr) return nullptr;
2297 Method* o = resolve_jmethod_id(mid);
2298 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2299 return nullptr;
2300 }
2301 // Method should otherwise be valid. Assert for testing.
2302 assert(is_valid_method(o), "should be valid jmethodid");
2303 // If the method's class holder object is unreferenced, but not yet marked as
2304 // unloaded, we need to return null here too because after a safepoint, its memory
2305 // will be reclaimed.
2306 return o->method_holder()->is_loader_alive() ? o : nullptr;
2307 };
2308
2309 void Method::set_on_stack(const bool value) {
2310 // Set both the method itself and its constant pool. The constant pool
2311 // on stack means some method referring to it is also on the stack.
2312 constants()->set_on_stack(value);
2313
2314 bool already_set = on_stack_flag();
2315 set_on_stack_flag(value);
2316 if (value && !already_set) {
2317 MetadataOnStackMark::record(this);
2318 }
2319 }
2320
2321 void Method::record_gc_epoch() {
2322 // If any method is on the stack in continuations, none of them can be reclaimed,
2323 // so save the marking cycle to check for the whole class in the cpCache.
2324 // The cpCache is writeable.
2325 constants()->cache()->record_gc_epoch();
2326 }
2327
2328 // Called when the class loader is unloaded to make all methods weak.
2329 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2330 loader_data->jmethod_ids()->clear_all_methods();
2331 }
2332
2333 void Method::clear_jmethod_id() {
2334 // Being at a safepoint prevents racing against other class redefinitions
2335 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2336 // The jmethodID is not stored in the Method instance, we need to look it up first
2337 jmethodID methodid = find_jmethod_id_or_null();
2338 // We need to make sure that jmethodID actually resolves to this method
2339 // - multiple redefined versions may share jmethodID slots and if a method
2340 // has already been rewired to a newer version we could be removing reference
2341 // to a still existing method instance
2342 if (methodid != nullptr && *((Method**)methodid) == this) {
2343 *((Method**)methodid) = nullptr;
2344 }
2345 }
2346
2347 bool Method::has_method_vptr(const void* ptr) {
2348 Method m;
2349 // This assumes that the vtbl pointer is the first word of a C++ object.
2350 return dereference_vptr(&m) == dereference_vptr(ptr);
2351 }
2352
2353 // Check that this pointer is valid by checking that the vtbl pointer matches
2354 bool Method::is_valid_method(const Method* m) {
2355 if (m == nullptr) {
2356 return false;
2357 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2358 // Quick sanity check on pointer.
2359 return false;
2360 } else if (!os::is_readable_range(m, m + 1)) {
2361 return false;
2362 } else if (m->is_shared()) {
2363 return CppVtables::is_valid_shared_method(m);
2364 } else if (Metaspace::contains_non_shared(m)) {
2365 return has_method_vptr((const void*)m);
2366 } else {
2367 return false;
2368 }
2369 }
2370
2371 #ifndef PRODUCT
2372 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2373 out->print("%d", loader_data->jmethod_ids()->count_methods());
2374 }
2375 #endif // PRODUCT
2376
2377
2378 // Printing
2379
2380 #ifndef PRODUCT
2381
2382 void Method::print_on(outputStream* st) const {
2383 ResourceMark rm;
2384 assert(is_method(), "must be method");
2385 st->print_cr("%s", internal_name());
2386 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2387 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2388 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2389 constants()->print_value_on(st); st->cr();
2390 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2391 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2392 st->print (" - name: "); name()->print_value_on(st); st->cr();
2393 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2394 st->print_cr(" - max stack: %d", max_stack());
2395 st->print_cr(" - max locals: %d", max_locals());
2396 st->print_cr(" - size of params: %d", size_of_parameters());
2397 st->print_cr(" - method size: %d", method_size());
2398 if (intrinsic_id() != vmIntrinsics::_none)
2399 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2400 if (highest_comp_level() != CompLevel_none)
2401 st->print_cr(" - highest level: %d", highest_comp_level());
2402 st->print_cr(" - vtable index: %d", _vtable_index);
2403 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2404 st->print( " - adapters: ");
2405 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2406 if (a == nullptr)
2407 st->print_cr(PTR_FORMAT, p2i(a));
2408 else
2409 a->print_adapter_on(st);
2410 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2411 st->print_cr(" - code size: %d", code_size());
2412 if (code_size() != 0) {
2413 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2414 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2415 }
2416 if (method_data() != nullptr) {
2417 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2418 }
2419 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2420 if (checked_exceptions_length() > 0) {
2421 CheckedExceptionElement* table = checked_exceptions_start();
2422 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2423 if (Verbose) {
2424 for (int i = 0; i < checked_exceptions_length(); i++) {
2425 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2426 }
2427 }
2428 }
2429 if (has_linenumber_table()) {
2430 u_char* table = compressed_linenumber_table();
2431 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2432 if (Verbose) {
2433 CompressedLineNumberReadStream stream(table);
2434 while (stream.read_pair()) {
2435 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2436 }
2437 }
2438 }
2439 st->print_cr(" - localvar length: %d", localvariable_table_length());
2440 if (localvariable_table_length() > 0) {
2441 LocalVariableTableElement* table = localvariable_table_start();
2442 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2443 if (Verbose) {
2444 for (int i = 0; i < localvariable_table_length(); i++) {
2445 int bci = table[i].start_bci;
2446 int len = table[i].length;
2447 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2448 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2449 int slot = table[i].slot;
2450 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2451 }
2452 }
2453 }
2454 if (code() != nullptr) {
2455 st->print (" - compiled code: ");
2456 code()->print_value_on(st);
2457 }
2458 if (is_native()) {
2459 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2460 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2461 }
2462 }
2463
2464 void Method::print_linkage_flags(outputStream* st) {
2465 access_flags().print_on(st);
2466 if (is_default_method()) {
2467 st->print("default ");
2468 }
2469 if (is_overpass()) {
2470 st->print("overpass ");
2471 }
2472 }
2473 #endif //PRODUCT
2474
2475 void Method::print_value_on(outputStream* st) const {
2476 assert(is_method(), "must be method");
2477 st->print("%s", internal_name());
2478 print_address_on(st);
2479 st->print(" ");
2480 name()->print_value_on(st);
2481 st->print(" ");
2482 signature()->print_value_on(st);
2483 st->print(" in ");
2484 method_holder()->print_value_on(st);
2485 if (WizardMode) st->print("#%d", _vtable_index);
2486 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2487 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2488 }
2489
2490 // Verification
2491
2492 void Method::verify_on(outputStream* st) {
2493 guarantee(is_method(), "object must be method");
2494 guarantee(constants()->is_constantPool(), "should be constant pool");
2495 MethodData* md = method_data();
2496 guarantee(md == nullptr ||
2497 md->is_methodData(), "should be method data");
2498 }