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