1 /*
2 * Copyright (c) 1997, 2023, 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/classLoaderDataGraph.hpp"
30 #include "classfile/metadataOnStackMark.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmClasses.hpp"
34 #include "code/codeCache.hpp"
35 #include "code/debugInfoRec.hpp"
36 #include "compiler/compilationPolicy.hpp"
37 #include "gc/shared/collectedHeap.inline.hpp"
38 #include "interpreter/bytecodeStream.hpp"
39 #include "interpreter/bytecodeTracer.hpp"
40 #include "interpreter/bytecodes.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/metaspaceClosure.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "nmt/memTracker.hpp"
53 #include "oops/constMethod.hpp"
54 #include "oops/constantPool.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/methodData.hpp"
58 #include "oops/objArrayKlass.hpp"
59 #include "oops/objArrayOop.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/symbol.hpp"
62 #include "prims/jvmtiExport.hpp"
63 #include "prims/methodHandles.hpp"
64 #include "runtime/atomic.hpp"
65 #include "runtime/continuationEntry.hpp"
66 #include "runtime/frame.inline.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/init.hpp"
69 #include "runtime/java.hpp"
70 #include "runtime/orderAccess.hpp"
71 #include "runtime/relocator.hpp"
72 #include "runtime/safepointVerifiers.hpp"
73 #include "runtime/sharedRuntime.hpp"
74 #include "runtime/signature.hpp"
75 #include "runtime/vm_version.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/quickSort.hpp"
78 #include "utilities/vmError.hpp"
79 #include "utilities/xmlstream.hpp"
80
81 // Implementation of Method
82
83 Method* Method::allocate(ClassLoaderData* loader_data,
84 int byte_code_size,
85 AccessFlags access_flags,
86 InlineTableSizes* sizes,
87 ConstMethod::MethodType method_type,
88 Symbol* name,
89 TRAPS) {
90 assert(!access_flags.is_native() || byte_code_size == 0,
91 "native methods should not contain byte codes");
92 ConstMethod* cm = ConstMethod::allocate(loader_data,
93 byte_code_size,
94 sizes,
95 method_type,
96 CHECK_NULL);
97 int size = Method::size(access_flags.is_native());
98 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
99 }
100
101 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
102 NoSafepointVerifier no_safepoint;
103 set_constMethod(xconst);
104 set_access_flags(access_flags);
105 set_intrinsic_id(vmIntrinsics::_none);
106 clear_method_data();
107 clear_method_counters();
108 set_vtable_index(Method::garbage_vtable_index);
109
110 // Fix and bury in Method*
111 set_interpreter_entry(nullptr); // sets i2i entry and from_int
112 set_adapter_entry(nullptr);
113 Method::clear_code(); // from_c/from_i get set to c2i/i2i
114
115 if (access_flags.is_native()) {
116 clear_native_function();
117 set_signature_handler(nullptr);
118 }
119
120 NOT_PRODUCT(set_compiled_invocation_count(0);)
121 // Name is very useful for debugging.
122 NOT_PRODUCT(_name = name;)
123 }
124
125 // Release Method*. The nmethod will be gone when we get here because
126 // we've walked the code cache.
127 void Method::deallocate_contents(ClassLoaderData* loader_data) {
128 MetadataFactory::free_metadata(loader_data, constMethod());
129 set_constMethod(nullptr);
130 MetadataFactory::free_metadata(loader_data, method_data());
131 clear_method_data();
132 MetadataFactory::free_metadata(loader_data, method_counters());
133 clear_method_counters();
134 // The nmethod will be gone when we get here.
135 if (code() != nullptr) _code = nullptr;
136 }
137
138 void Method::release_C_heap_structures() {
139 if (method_data()) {
140 method_data()->release_C_heap_structures();
141
142 // Destroy MethodData embedded lock
143 method_data()->~MethodData();
144 }
145 }
146
147 address Method::get_i2c_entry() {
148 assert(adapter() != nullptr, "must have");
149 return adapter()->get_i2c_entry();
150 }
151
152 address Method::get_c2i_entry() {
153 assert(adapter() != nullptr, "must have");
154 return adapter()->get_c2i_entry();
155 }
156
157 address Method::get_c2i_unverified_entry() {
158 assert(adapter() != nullptr, "must have");
159 return adapter()->get_c2i_unverified_entry();
160 }
161
162 address Method::get_c2i_no_clinit_check_entry() {
163 assert(VM_Version::supports_fast_class_init_checks(), "");
164 assert(adapter() != nullptr, "must have");
165 return adapter()->get_c2i_no_clinit_check_entry();
166 }
167
168 char* Method::name_and_sig_as_C_string() const {
169 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
170 }
171
172 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
173 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
174 }
175
176 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
177 const char* klass_name = klass->external_name();
178 int klass_name_len = (int)strlen(klass_name);
179 int method_name_len = method_name->utf8_length();
180 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
181 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
182 strcpy(dest, klass_name);
183 dest[klass_name_len] = '.';
184 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
185 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
186 dest[len] = 0;
187 return dest;
188 }
189
190 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
191 Symbol* klass_name = klass->name();
192 klass_name->as_klass_external_name(buf, size);
193 int len = (int)strlen(buf);
194
195 if (len < size - 1) {
196 buf[len++] = '.';
197
198 method_name->as_C_string(&(buf[len]), size - len);
199 len = (int)strlen(buf);
200
201 signature->as_C_string(&(buf[len]), size - len);
202 }
203
204 return buf;
205 }
206
207 const char* Method::external_name() const {
208 return external_name(constants()->pool_holder(), name(), signature());
209 }
210
211 void Method::print_external_name(outputStream *os) const {
212 print_external_name(os, constants()->pool_holder(), name(), signature());
213 }
214
215 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
216 stringStream ss;
217 print_external_name(&ss, klass, method_name, signature);
218 return ss.as_string();
219 }
220
221 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
222 signature->print_as_signature_external_return_type(os);
223 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
224 signature->print_as_signature_external_parameters(os);
225 os->print(")");
226 }
227
228 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
229 if (log_is_enabled(Debug, exceptions)) {
230 ResourceMark rm(THREAD);
231 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
232 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
233 }
234 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
235 // access exception table
236 ExceptionTable table(mh());
237 int length = table.length();
238 // iterate through all entries sequentially
239 constantPoolHandle pool(THREAD, mh->constants());
240 for (int i = 0; i < length; i ++) {
241 //reacquire the table in case a GC happened
242 ExceptionTable table(mh());
243 int beg_bci = table.start_pc(i);
244 int end_bci = table.end_pc(i);
245 assert(beg_bci <= end_bci, "inconsistent exception table");
246 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
247 beg_bci, end_bci);
248
249 if (beg_bci <= throw_bci && throw_bci < end_bci) {
250 // exception handler bci range covers throw_bci => investigate further
251 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
252
253 int handler_bci = table.handler_pc(i);
254 int klass_index = table.catch_type_index(i);
255 if (klass_index == 0) {
256 if (log_is_enabled(Info, exceptions)) {
257 ResourceMark rm(THREAD);
258 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
259 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
260 }
261 return handler_bci;
262 } else if (ex_klass == nullptr) {
263 // Is this even possible?
264 if (log_is_enabled(Info, exceptions)) {
265 ResourceMark rm(THREAD);
266 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
267 mh()->name()->as_C_string(), handler_bci);
268 }
269 return handler_bci;
270 } else {
271 if (log_is_enabled(Debug, exceptions)) {
272 ResourceMark rm(THREAD);
273 log_debug(exceptions)(" - resolving catch type \"%s\"",
274 pool->klass_name_at(klass_index)->as_C_string());
275 }
276 // we know the exception class => get the constraint class
277 // this may require loading of the constraint class; if verification
278 // fails or some other exception occurs, return handler_bci
279 Klass* k = pool->klass_at(klass_index, THREAD);
280 if (HAS_PENDING_EXCEPTION) {
281 if (log_is_enabled(Debug, exceptions)) {
282 ResourceMark rm(THREAD);
283 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
284 PENDING_EXCEPTION->klass()->external_name());
285 }
286 return handler_bci;
287 }
288 assert(k != nullptr, "klass not loaded");
289 if (ex_klass->is_subtype_of(k)) {
290 if (log_is_enabled(Info, exceptions)) {
291 ResourceMark rm(THREAD);
292 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
293 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
294 }
295 return handler_bci;
296 }
297 }
298 }
299 }
300
301 if (log_is_enabled(Debug, exceptions)) {
302 ResourceMark rm(THREAD);
303 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
304 ex_klass->external_name(), mh->name()->as_C_string());
305 }
306
307 return -1;
308 }
309
310 void Method::mask_for(int bci, InterpreterOopMap* mask) {
311 methodHandle h_this(Thread::current(), this);
312 // Only GC uses the OopMapCache during thread stack root scanning
313 // any other uses generate an oopmap but do not save it in the cache.
314 if (Universe::heap()->is_gc_active()) {
315 method_holder()->mask_for(h_this, bci, mask);
316 } else {
317 OopMapCache::compute_one_oop_map(h_this, bci, mask);
318 }
319 return;
320 }
321
322
323 int Method::bci_from(address bcp) const {
324 if (is_native() && bcp == 0) {
325 return 0;
326 }
327 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
328 // may call this after interrupting a nested ResourceMark.
329 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
330 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
331
332 return int(bcp - code_base());
333 }
334
335
336 int Method::validate_bci(int bci) const {
337 return (bci == 0 || bci < code_size()) ? bci : -1;
338 }
339
340 // Return bci if it appears to be a valid bcp
341 // Return -1 otherwise.
342 // Used by profiling code, when invalid data is a possibility.
343 // The caller is responsible for validating the Method* itself.
344 int Method::validate_bci_from_bcp(address bcp) const {
345 // keep bci as -1 if not a valid bci
346 int bci = -1;
347 if (bcp == 0 || bcp == code_base()) {
348 // code_size() may return 0 and we allow 0 here
349 // the method may be native
350 bci = 0;
351 } else if (contains(bcp)) {
352 bci = int(bcp - code_base());
353 }
354 // Assert that if we have dodged any asserts, bci is negative.
355 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
356 return bci;
357 }
358
359 address Method::bcp_from(int bci) const {
360 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
361 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
362 address bcp = code_base() + bci;
363 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
364 return bcp;
365 }
366
367 address Method::bcp_from(address bcp) const {
368 if (is_native() && bcp == nullptr) {
369 return code_base();
370 } else {
371 return bcp;
372 }
373 }
374
375 int Method::size(bool is_native) {
376 // If native, then include pointers for native_function and signature_handler
377 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
378 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
379 return align_metadata_size(header_size() + extra_words);
380 }
381
382 Symbol* Method::klass_name() const {
383 return method_holder()->name();
384 }
385
386 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
387 log_trace(cds)("Iter(Method): %p", this);
388
389 if (!method_holder()->is_rewritten()) {
390 it->push(&_constMethod, MetaspaceClosure::_writable);
391 } else {
392 it->push(&_constMethod);
393 }
394 it->push(&_method_data);
395 it->push(&_method_counters);
396 NOT_PRODUCT(it->push(&_name);)
397 }
398
399 #if INCLUDE_CDS
400 // Attempt to return method to original state. Clear any pointers
401 // (to objects outside the shared spaces). We won't be able to predict
402 // where they should point in a new JVM. Further initialize some
403 // entries now in order allow them to be write protected later.
404
405 void Method::remove_unshareable_info() {
406 unlink_method();
407 JFR_ONLY(REMOVE_METHOD_ID(this);)
408 }
409
410 void Method::restore_unshareable_info(TRAPS) {
411 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
412 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
413 }
414 #endif
415
416 void Method::set_vtable_index(int index) {
417 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
418 // At runtime initialize_vtable is rerun as part of link_class_impl()
419 // for a shared class loaded by the non-boot loader to obtain the loader
420 // constraints based on the runtime classloaders' context.
421 return; // don't write into the shared class
422 } else {
423 _vtable_index = index;
424 }
425 }
426
427 void Method::set_itable_index(int index) {
428 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
429 // At runtime initialize_itable is rerun as part of link_class_impl()
430 // for a shared class loaded by the non-boot loader to obtain the loader
431 // constraints based on the runtime classloaders' context. The dumptime
432 // itable index should be the same as the runtime index.
433 assert(_vtable_index == itable_index_max - index,
434 "archived itable index is different from runtime index");
435 return; // don’t write into the shared class
436 } else {
437 _vtable_index = itable_index_max - index;
438 }
439 assert(valid_itable_index(), "");
440 }
441
442 // The RegisterNatives call being attempted tried to register with a method that
443 // is not native. Ask JVM TI what prefixes have been specified. Then check
444 // to see if the native method is now wrapped with the prefixes. See the
445 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
446 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
447 #if INCLUDE_JVMTI
448 ResourceMark rm(THREAD);
449 Method* method;
450 int name_len = name->utf8_length();
451 char* name_str = name->as_utf8();
452 int prefix_count;
453 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
454 for (int i = 0; i < prefix_count; i++) {
455 char* prefix = prefixes[i];
456 int prefix_len = (int)strlen(prefix);
457
458 // try adding this prefix to the method name and see if it matches another method name
459 int trial_len = name_len + prefix_len;
460 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
461 strcpy(trial_name_str, prefix);
462 strcat(trial_name_str, name_str);
463 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
464 if (trial_name == nullptr) {
465 continue; // no such symbol, so this prefix wasn't used, try the next prefix
466 }
467 method = k->lookup_method(trial_name, signature);
468 if (method == nullptr) {
469 continue; // signature doesn't match, try the next prefix
470 }
471 if (method->is_native()) {
472 method->set_is_prefixed_native();
473 return method; // wahoo, we found a prefixed version of the method, return it
474 }
475 // found as non-native, so prefix is good, add it, probably just need more prefixes
476 name_len = trial_len;
477 name_str = trial_name_str;
478 }
479 #endif // INCLUDE_JVMTI
480 return nullptr; // not found
481 }
482
483 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
484 Method* method = k->lookup_method(name, signature);
485 if (method == nullptr) {
486 ResourceMark rm(THREAD);
487 stringStream st;
488 st.print("Method '");
489 print_external_name(&st, k, name, signature);
490 st.print("' name or signature does not match");
491 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
492 }
493 if (!method->is_native()) {
494 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
495 method = find_prefixed_native(k, name, signature, THREAD);
496 if (method == nullptr) {
497 ResourceMark rm(THREAD);
498 stringStream st;
499 st.print("Method '");
500 print_external_name(&st, k, name, signature);
501 st.print("' is not declared as native");
502 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
503 }
504 }
505
506 if (entry != nullptr) {
507 method->set_native_function(entry, native_bind_event_is_interesting);
508 } else {
509 method->clear_native_function();
510 }
511 if (log_is_enabled(Debug, jni, resolve)) {
512 ResourceMark rm(THREAD);
513 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
514 method->method_holder()->external_name(),
515 method->name()->as_C_string());
516 }
517 return true;
518 }
519
520 bool Method::was_executed_more_than(int n) {
521 // Invocation counter is reset when the Method* is compiled.
522 // If the method has compiled code we therefore assume it has
523 // be executed more than n times.
524 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
525 // interpreter doesn't bump invocation counter of trivial methods
526 // compiler does not bump invocation counter of compiled methods
527 return true;
528 }
529 else if ((method_counters() != nullptr &&
530 method_counters()->invocation_counter()->carry()) ||
531 (method_data() != nullptr &&
532 method_data()->invocation_counter()->carry())) {
533 // The carry bit is set when the counter overflows and causes
534 // a compilation to occur. We don't know how many times
535 // the counter has been reset, so we simply assume it has
536 // been executed more than n times.
537 return true;
538 } else {
539 return invocation_count() > n;
540 }
541 }
542
543 void Method::print_invocation_count() {
544 //---< compose+print method return type, klass, name, and signature >---
545 if (is_static()) tty->print("static ");
546 if (is_final()) tty->print("final ");
547 if (is_synchronized()) tty->print("synchronized ");
548 if (is_native()) tty->print("native ");
549 tty->print("%s::", method_holder()->external_name());
550 name()->print_symbol_on(tty);
551 signature()->print_symbol_on(tty);
552
553 if (WizardMode) {
554 // dump the size of the byte codes
555 tty->print(" {%d}", code_size());
556 }
557 tty->cr();
558
559 // Counting based on signed int counters tends to overflow with
560 // longer-running workloads on fast machines. The counters under
561 // consideration here, however, are limited in range by counting
562 // logic. See InvocationCounter:count_limit for example.
563 // No "overflow precautions" need to be implemented here.
564 tty->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
565 tty->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
566 tty->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
567
568 if (method_data() != nullptr) {
569 tty->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
570 }
571
572 #ifndef PRODUCT
573 if (CountCompiledCalls) {
574 tty->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
575 }
576 #endif
577 }
578
579 // Build a MethodData* object to hold profiling information collected on this
580 // method when requested.
581 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
582 // Do not profile the method if metaspace has hit an OOM previously
583 // allocating profiling data. Callers clear pending exception so don't
584 // add one here.
585 if (ClassLoaderDataGraph::has_metaspace_oom()) {
586 return;
587 }
588
589 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
590 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
591 if (HAS_PENDING_EXCEPTION) {
592 CompileBroker::log_metaspace_failure();
593 ClassLoaderDataGraph::set_metaspace_oom(true);
594 return; // return the exception (which is cleared)
595 }
596
597 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
598 MetadataFactory::free_metadata(loader_data, method_data);
599 return;
600 }
601
602 if (PrintMethodData && (Verbose || WizardMode)) {
603 ResourceMark rm(THREAD);
604 tty->print("build_profiling_method_data for ");
605 method->print_name(tty);
606 tty->cr();
607 // At the end of the run, the MDO, full of data, will be dumped.
608 }
609 }
610
611 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
612 // Do not profile the method if metaspace has hit an OOM previously
613 if (ClassLoaderDataGraph::has_metaspace_oom()) {
614 return nullptr;
615 }
616
617 methodHandle mh(current, m);
618 MethodCounters* counters;
619 if (current->is_Java_thread()) {
620 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
621 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
622 // if needed.
623 counters = MethodCounters::allocate_with_exception(mh, THREAD);
624 if (HAS_PENDING_EXCEPTION) {
625 CLEAR_PENDING_EXCEPTION;
626 }
627 } else {
628 // Call metaspace allocation that doesn't throw exception if the
629 // current thread isn't a JavaThread, ie. the VMThread.
630 counters = MethodCounters::allocate_no_exception(mh);
631 }
632
633 if (counters == nullptr) {
634 CompileBroker::log_metaspace_failure();
635 ClassLoaderDataGraph::set_metaspace_oom(true);
636 return nullptr;
637 }
638
639 if (!mh->init_method_counters(counters)) {
640 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
641 }
642
643 return mh->method_counters();
644 }
645
646 bool Method::init_method_counters(MethodCounters* counters) {
647 // Try to install a pointer to MethodCounters, return true on success.
648 return Atomic::replace_if_null(&_method_counters, counters);
649 }
650
651 void Method::set_exception_handler_entered(int handler_bci) {
652 if (ProfileExceptionHandlers) {
653 MethodData* mdo = method_data();
654 if (mdo != nullptr) {
655 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
656 handler_data.set_exception_handler_entered();
657 }
658 }
659 }
660
661 int Method::extra_stack_words() {
662 // not an inline function, to avoid a header dependency on Interpreter
663 return extra_stack_entries() * Interpreter::stackElementSize;
664 }
665
666 bool Method::is_vanilla_constructor() const {
667 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
668 // which only calls the superclass vanilla constructor and possibly does stores of
669 // zero constants to local fields:
670 //
671 // aload_0
672 // invokespecial
673 // indexbyte1
674 // indexbyte2
675 //
676 // followed by an (optional) sequence of:
677 //
678 // aload_0
679 // aconst_null / iconst_0 / fconst_0 / dconst_0
680 // putfield
681 // indexbyte1
682 // indexbyte2
683 //
684 // followed by:
685 //
686 // return
687
688 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
689 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
690 int size = code_size();
691 // Check if size match
692 if (size == 0 || size % 5 != 0) return false;
693 address cb = code_base();
694 int last = size - 1;
695 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
696 // Does not call superclass default constructor
697 return false;
698 }
699 // Check optional sequence
700 for (int i = 4; i < last; i += 5) {
701 if (cb[i] != Bytecodes::_aload_0) return false;
702 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
703 if (cb[i+2] != Bytecodes::_putfield) return false;
704 }
705 return true;
706 }
707
708
709 bool Method::compute_has_loops_flag() {
710 BytecodeStream bcs(methodHandle(Thread::current(), this));
711 Bytecodes::Code bc;
712
713 while ((bc = bcs.next()) >= 0) {
714 switch (bc) {
715 case Bytecodes::_ifeq:
716 case Bytecodes::_ifnull:
717 case Bytecodes::_iflt:
718 case Bytecodes::_ifle:
719 case Bytecodes::_ifne:
720 case Bytecodes::_ifnonnull:
721 case Bytecodes::_ifgt:
722 case Bytecodes::_ifge:
723 case Bytecodes::_if_icmpeq:
724 case Bytecodes::_if_icmpne:
725 case Bytecodes::_if_icmplt:
726 case Bytecodes::_if_icmpgt:
727 case Bytecodes::_if_icmple:
728 case Bytecodes::_if_icmpge:
729 case Bytecodes::_if_acmpeq:
730 case Bytecodes::_if_acmpne:
731 case Bytecodes::_goto:
732 case Bytecodes::_jsr:
733 if (bcs.dest() < bcs.next_bci()) {
734 return set_has_loops();
735 }
736 break;
737
738 case Bytecodes::_goto_w:
739 case Bytecodes::_jsr_w:
740 if (bcs.dest_w() < bcs.next_bci()) {
741 return set_has_loops();
742 }
743 break;
744
745 case Bytecodes::_lookupswitch: {
746 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
747 if (lookupswitch.default_offset() < 0) {
748 return set_has_loops();
749 } else {
750 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
751 LookupswitchPair pair = lookupswitch.pair_at(i);
752 if (pair.offset() < 0) {
753 return set_has_loops();
754 }
755 }
756 }
757 break;
758 }
759 case Bytecodes::_tableswitch: {
760 Bytecode_tableswitch tableswitch(this, bcs.bcp());
761 if (tableswitch.default_offset() < 0) {
762 return set_has_loops();
763 } else {
764 for (int i = 0; i < tableswitch.length(); ++i) {
765 if (tableswitch.dest_offset_at(i) < 0) {
766 return set_has_loops();
767 }
768 }
769 }
770 break;
771 }
772 default:
773 break;
774 }
775 }
776
777 _flags.set_has_loops_flag_init(true);
778 return false;
779 }
780
781 bool Method::is_final_method(AccessFlags class_access_flags) const {
782 // or "does_not_require_vtable_entry"
783 // default method or overpass can occur, is not final (reuses vtable entry)
784 // private methods in classes get vtable entries for backward class compatibility.
785 if (is_overpass() || is_default_method()) return false;
786 return is_final() || class_access_flags.is_final();
787 }
788
789 bool Method::is_final_method() const {
790 return is_final_method(method_holder()->access_flags());
791 }
792
793 bool Method::is_default_method() const {
794 if (method_holder() != nullptr &&
795 method_holder()->is_interface() &&
796 !is_abstract() && !is_private()) {
797 return true;
798 } else {
799 return false;
800 }
801 }
802
803 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
804 if (is_final_method(class_access_flags)) return true;
805 #ifdef ASSERT
806 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
807 if (class_access_flags.is_interface()) {
808 ResourceMark rm;
809 assert(is_nonv == is_static() || is_nonv == is_private(),
810 "nonvirtual unexpected for non-static, non-private: %s",
811 name_and_sig_as_C_string());
812 }
813 #endif
814 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
815 return vtable_index() == nonvirtual_vtable_index;
816 }
817
818 bool Method::can_be_statically_bound() const {
819 return can_be_statically_bound(method_holder()->access_flags());
820 }
821
822 bool Method::can_be_statically_bound(InstanceKlass* context) const {
823 return (method_holder() == context) && can_be_statically_bound();
824 }
825
826 /**
827 * Returns false if this is one of specially treated methods for
828 * which we have to provide stack trace in throw in compiled code.
829 * Returns true otherwise.
830 */
831 bool Method::can_omit_stack_trace() {
832 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
833 return false; // All methods in sun.invoke.util.ValueConversions
834 }
835 return true;
836 }
837
838 bool Method::is_accessor() const {
839 return is_getter() || is_setter();
840 }
841
842 bool Method::is_getter() const {
843 if (code_size() != 5) return false;
844 if (size_of_parameters() != 1) return false;
845 if (java_code_at(0) != Bytecodes::_aload_0) return false;
846 if (java_code_at(1) != Bytecodes::_getfield) return false;
847 switch (java_code_at(4)) {
848 case Bytecodes::_ireturn:
849 case Bytecodes::_lreturn:
850 case Bytecodes::_freturn:
851 case Bytecodes::_dreturn:
852 case Bytecodes::_areturn:
853 break;
854 default:
855 return false;
856 }
857 return true;
858 }
859
860 bool Method::is_setter() const {
861 if (code_size() != 6) return false;
862 if (java_code_at(0) != Bytecodes::_aload_0) return false;
863 switch (java_code_at(1)) {
864 case Bytecodes::_iload_1:
865 case Bytecodes::_aload_1:
866 case Bytecodes::_fload_1:
867 if (size_of_parameters() != 2) return false;
868 break;
869 case Bytecodes::_dload_1:
870 case Bytecodes::_lload_1:
871 if (size_of_parameters() != 3) return false;
872 break;
873 default:
874 return false;
875 }
876 if (java_code_at(2) != Bytecodes::_putfield) return false;
877 if (java_code_at(5) != Bytecodes::_return) return false;
878 return true;
879 }
880
881 bool Method::is_constant_getter() const {
882 int last_index = code_size() - 1;
883 // Check if the first 1-3 bytecodes are a constant push
884 // and the last bytecode is a return.
885 return (2 <= code_size() && code_size() <= 4 &&
886 Bytecodes::is_const(java_code_at(0)) &&
887 Bytecodes::length_for(java_code_at(0)) == last_index &&
888 Bytecodes::is_return(java_code_at(last_index)));
889 }
890
891 bool Method::is_initializer() const {
892 return is_object_initializer() || is_static_initializer();
893 }
894
895 bool Method::has_valid_initializer_flags() const {
896 return (is_static() ||
897 method_holder()->major_version() < 51);
898 }
899
900 bool Method::is_static_initializer() const {
901 // For classfiles version 51 or greater, ensure that the clinit method is
902 // static. Non-static methods with the name "<clinit>" are not static
903 // initializers. (older classfiles exempted for backward compatibility)
904 return name() == vmSymbols::class_initializer_name() &&
905 has_valid_initializer_flags();
906 }
907
908 bool Method::is_object_initializer() const {
909 return name() == vmSymbols::object_initializer_name();
910 }
911
912 bool Method::needs_clinit_barrier() const {
913 return is_static() && !method_holder()->is_initialized();
914 }
915
916 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
917 int length = method->checked_exceptions_length();
918 if (length == 0) { // common case
919 return objArrayHandle(THREAD, Universe::the_empty_class_array());
920 } else {
921 methodHandle h_this(THREAD, method);
922 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
923 objArrayHandle mirrors (THREAD, m_oop);
924 for (int i = 0; i < length; i++) {
925 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
926 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
927 if (log_is_enabled(Warning, exceptions) &&
928 !k->is_subclass_of(vmClasses::Throwable_klass())) {
929 ResourceMark rm(THREAD);
930 log_warning(exceptions)(
931 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
932 k->external_name(), method->external_name());
933 }
934 mirrors->obj_at_put(i, k->java_mirror());
935 }
936 return mirrors;
937 }
938 };
939
940
941 int Method::line_number_from_bci(int bci) const {
942 int best_bci = 0;
943 int best_line = -1;
944 if (bci == SynchronizationEntryBCI) bci = 0;
945 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
946 // The line numbers are a short array of 2-tuples [start_pc, line_number].
947 // Not necessarily sorted and not necessarily one-to-one.
948 CompressedLineNumberReadStream stream(compressed_linenumber_table());
949 while (stream.read_pair()) {
950 if (stream.bci() == bci) {
951 // perfect match
952 return stream.line();
953 } else {
954 // update best_bci/line
955 if (stream.bci() < bci && stream.bci() >= best_bci) {
956 best_bci = stream.bci();
957 best_line = stream.line();
958 }
959 }
960 }
961 }
962 return best_line;
963 }
964
965
966 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
967 if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
968 Thread *thread = Thread::current();
969 Symbol* klass_name = constants()->klass_name_at(klass_index);
970 Handle loader(thread, method_holder()->class_loader());
971 Handle prot (thread, method_holder()->protection_domain());
972 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != nullptr;
973 } else {
974 return true;
975 }
976 }
977
978
979 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
980 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
981 if (must_be_resolved) {
982 // Make sure klass is resolved in constantpool.
983 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
984 }
985 return is_klass_loaded_by_klass_index(klass_index);
986 }
987
988
989 void Method::set_native_function(address function, bool post_event_flag) {
990 assert(function != nullptr, "use clear_native_function to unregister natives");
991 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
992 address* native_function = native_function_addr();
993
994 // We can see racers trying to place the same native function into place. Once
995 // is plenty.
996 address current = *native_function;
997 if (current == function) return;
998 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
999 function != nullptr) {
1000 // native_method_throw_unsatisfied_link_error_entry() should only
1001 // be passed when post_event_flag is false.
1002 assert(function !=
1003 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1004 "post_event_flag mismatch");
1005
1006 // post the bind event, and possible change the bind function
1007 JvmtiExport::post_native_method_bind(this, &function);
1008 }
1009 *native_function = function;
1010 // This function can be called more than once. We must make sure that we always
1011 // use the latest registered method -> check if a stub already has been generated.
1012 // If so, we have to make it not_entrant.
1013 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
1014 if (nm != nullptr) {
1015 nm->make_not_entrant();
1016 }
1017 }
1018
1019
1020 bool Method::has_native_function() const {
1021 if (is_special_native_intrinsic())
1022 return false; // special-cased in SharedRuntime::generate_native_wrapper
1023 address func = native_function();
1024 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1025 }
1026
1027
1028 void Method::clear_native_function() {
1029 // Note: is_method_handle_intrinsic() is allowed here.
1030 set_native_function(
1031 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1032 !native_bind_event_is_interesting);
1033 this->unlink_code();
1034 }
1035
1036
1037 void Method::set_signature_handler(address handler) {
1038 address* signature_handler = signature_handler_addr();
1039 *signature_handler = handler;
1040 }
1041
1042
1043 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1044 assert(reason != nullptr, "must provide a reason");
1045 if (PrintCompilation && report) {
1046 ttyLocker ttyl;
1047 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1048 if (comp_level == CompLevel_all) {
1049 tty->print("all levels ");
1050 } else {
1051 tty->print("level %d ", comp_level);
1052 }
1053 this->print_short_name(tty);
1054 int size = this->code_size();
1055 if (size > 0) {
1056 tty->print(" (%d bytes)", size);
1057 }
1058 if (reason != nullptr) {
1059 tty->print(" %s", reason);
1060 }
1061 tty->cr();
1062 }
1063 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1064 ttyLocker ttyl;
1065 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
1066 os::current_thread_id(), is_osr, comp_level);
1067 if (reason != nullptr) {
1068 xtty->print(" reason=\'%s\'", reason);
1069 }
1070 xtty->method(this);
1071 xtty->stamp();
1072 xtty->end_elem();
1073 }
1074 }
1075
1076 bool Method::is_always_compilable() const {
1077 // Generated adapters must be compiled
1078 if (is_special_native_intrinsic() && is_synthetic()) {
1079 assert(!is_not_c1_compilable(), "sanity check");
1080 assert(!is_not_c2_compilable(), "sanity check");
1081 return true;
1082 }
1083
1084 return false;
1085 }
1086
1087 bool Method::is_not_compilable(int comp_level) const {
1088 if (number_of_breakpoints() > 0)
1089 return true;
1090 if (is_always_compilable())
1091 return false;
1092 if (comp_level == CompLevel_any)
1093 return is_not_c1_compilable() && is_not_c2_compilable();
1094 if (is_c1_compile(comp_level))
1095 return is_not_c1_compilable();
1096 if (is_c2_compile(comp_level))
1097 return is_not_c2_compilable();
1098 return false;
1099 }
1100
1101 // call this when compiler finds that this method is not compilable
1102 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1103 if (is_always_compilable()) {
1104 // Don't mark a method which should be always compilable
1105 return;
1106 }
1107 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1108 if (comp_level == CompLevel_all) {
1109 set_is_not_c1_compilable();
1110 set_is_not_c2_compilable();
1111 } else {
1112 if (is_c1_compile(comp_level))
1113 set_is_not_c1_compilable();
1114 if (is_c2_compile(comp_level))
1115 set_is_not_c2_compilable();
1116 }
1117 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1118 }
1119
1120 bool Method::is_not_osr_compilable(int comp_level) const {
1121 if (is_not_compilable(comp_level))
1122 return true;
1123 if (comp_level == CompLevel_any)
1124 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1125 if (is_c1_compile(comp_level))
1126 return is_not_c1_osr_compilable();
1127 if (is_c2_compile(comp_level))
1128 return is_not_c2_osr_compilable();
1129 return false;
1130 }
1131
1132 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1133 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1134 if (comp_level == CompLevel_all) {
1135 set_is_not_c1_osr_compilable();
1136 set_is_not_c2_osr_compilable();
1137 } else {
1138 if (is_c1_compile(comp_level))
1139 set_is_not_c1_osr_compilable();
1140 if (is_c2_compile(comp_level))
1141 set_is_not_c2_osr_compilable();
1142 }
1143 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1144 }
1145
1146 // Revert to using the interpreter and clear out the nmethod
1147 void Method::clear_code() {
1148 // this may be null if c2i adapters have not been made yet
1149 // Only should happen at allocate time.
1150 if (adapter() == nullptr) {
1151 _from_compiled_entry = nullptr;
1152 } else {
1153 _from_compiled_entry = adapter()->get_c2i_entry();
1154 }
1155 OrderAccess::storestore();
1156 _from_interpreted_entry = _i2i_entry;
1157 OrderAccess::storestore();
1158 _code = nullptr;
1159 }
1160
1161 void Method::unlink_code(CompiledMethod *compare) {
1162 ConditionalMutexLocker ml(CompiledMethod_lock, !CompiledMethod_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1163 // We need to check if either the _code or _from_compiled_code_entry_point
1164 // refer to this nmethod because there is a race in setting these two fields
1165 // in Method* as seen in bugid 4947125.
1166 if (code() == compare ||
1167 from_compiled_entry() == compare->verified_entry_point()) {
1168 clear_code();
1169 }
1170 }
1171
1172 void Method::unlink_code() {
1173 ConditionalMutexLocker ml(CompiledMethod_lock, !CompiledMethod_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1174 clear_code();
1175 }
1176
1177 #if INCLUDE_CDS
1178 // Called by class data sharing to remove any entry points (which are not shared)
1179 void Method::unlink_method() {
1180 assert(CDSConfig::is_dumping_archive(), "sanity");
1181 _code = nullptr;
1182 _adapter = nullptr;
1183 _i2i_entry = nullptr;
1184 _from_compiled_entry = nullptr;
1185 _from_interpreted_entry = nullptr;
1186
1187 if (is_native()) {
1188 *native_function_addr() = nullptr;
1189 set_signature_handler(nullptr);
1190 }
1191 NOT_PRODUCT(set_compiled_invocation_count(0);)
1192
1193 clear_method_data();
1194 clear_method_counters();
1195 remove_unshareable_flags();
1196 }
1197
1198 void Method::remove_unshareable_flags() {
1199 // clear all the flags that shouldn't be in the archived version
1200 assert(!is_old(), "must be");
1201 assert(!is_obsolete(), "must be");
1202 assert(!is_deleted(), "must be");
1203
1204 set_is_prefixed_native(false);
1205 set_queued_for_compilation(false);
1206 set_is_not_c2_compilable(false);
1207 set_is_not_c1_compilable(false);
1208 set_is_not_c2_osr_compilable(false);
1209 set_on_stack_flag(false);
1210 }
1211 #endif
1212
1213 // Called when the method_holder is getting linked. Setup entrypoints so the method
1214 // is ready to be called from interpreter, compiler, and vtables.
1215 void Method::link_method(const methodHandle& h_method, TRAPS) {
1216 // If the code cache is full, we may reenter this function for the
1217 // leftover methods that weren't linked.
1218 if (adapter() != nullptr) {
1219 return;
1220 }
1221 assert( _code == nullptr, "nothing compiled yet" );
1222
1223 // Setup interpreter entrypoint
1224 assert(this == h_method(), "wrong h_method()" );
1225
1226 assert(adapter() == nullptr, "init'd to null");
1227 address entry = Interpreter::entry_for_method(h_method);
1228 assert(entry != nullptr, "interpreter entry must be non-null");
1229 // Sets both _i2i_entry and _from_interpreted_entry
1230 set_interpreter_entry(entry);
1231
1232 // Don't overwrite already registered native entries.
1233 if (is_native() && !has_native_function()) {
1234 set_native_function(
1235 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1236 !native_bind_event_is_interesting);
1237 }
1238
1239 // Setup compiler entrypoint. This is made eagerly, so we do not need
1240 // special handling of vtables. An alternative is to make adapters more
1241 // lazily by calling make_adapter() from from_compiled_entry() for the
1242 // normal calls. For vtable calls life gets more complicated. When a
1243 // call-site goes mega-morphic we need adapters in all methods which can be
1244 // called from the vtable. We need adapters on such methods that get loaded
1245 // later. Ditto for mega-morphic itable calls. If this proves to be a
1246 // problem we'll make these lazily later.
1247 (void) make_adapters(h_method, CHECK);
1248
1249 // ONLY USE the h_method now as make_adapter may have blocked
1250
1251 if (h_method->is_continuation_native_intrinsic()) {
1252 // the entry points to this method will be set in set_code, called when first resolving this method
1253 _from_interpreted_entry = nullptr;
1254 _from_compiled_entry = nullptr;
1255 _i2i_entry = nullptr;
1256 }
1257 }
1258
1259 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1260 // Adapters for compiled code are made eagerly here. They are fairly
1261 // small (generally < 100 bytes) and quick to make (and cached and shared)
1262 // so making them eagerly shouldn't be too expensive.
1263 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1264 if (adapter == nullptr ) {
1265 if (!is_init_completed()) {
1266 // Don't throw exceptions during VM initialization because java.lang.* classes
1267 // might not have been initialized, causing problems when constructing the
1268 // Java exception object.
1269 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1270 } else {
1271 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1272 }
1273 }
1274
1275 mh->set_adapter_entry(adapter);
1276 mh->_from_compiled_entry = adapter->get_c2i_entry();
1277 return adapter->get_c2i_entry();
1278 }
1279
1280 // The verified_code_entry() must be called when a invoke is resolved
1281 // on this method.
1282
1283 // It returns the compiled code entry point, after asserting not null.
1284 // This function is called after potential safepoints so that nmethod
1285 // or adapter that it points to is still live and valid.
1286 // This function must not hit a safepoint!
1287 address Method::verified_code_entry() {
1288 debug_only(NoSafepointVerifier nsv;)
1289 assert(_from_compiled_entry != nullptr, "must be set");
1290 return _from_compiled_entry;
1291 }
1292
1293 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1294 // (could be racing a deopt).
1295 // Not inline to avoid circular ref.
1296 bool Method::check_code() const {
1297 // cached in a register or local. There's a race on the value of the field.
1298 CompiledMethod *code = Atomic::load_acquire(&_code);
1299 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1300 }
1301
1302 // Install compiled code. Instantly it can execute.
1303 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1304 assert_lock_strong(CompiledMethod_lock);
1305 assert( code, "use clear_code to remove code" );
1306 assert( mh->check_code(), "" );
1307
1308 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1309
1310 // These writes must happen in this order, because the interpreter will
1311 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1312 // which jumps to _from_compiled_entry.
1313 mh->_code = code; // Assign before allowing compiled code to exec
1314
1315 int comp_level = code->comp_level();
1316 // In theory there could be a race here. In practice it is unlikely
1317 // and not worth worrying about.
1318 if (comp_level > mh->highest_comp_level()) {
1319 mh->set_highest_comp_level(comp_level);
1320 }
1321
1322 OrderAccess::storestore();
1323 mh->_from_compiled_entry = code->verified_entry_point();
1324 OrderAccess::storestore();
1325
1326 if (mh->is_continuation_native_intrinsic()) {
1327 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1328
1329 if (mh->is_continuation_enter_intrinsic()) {
1330 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1331 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1332 } else if (mh->is_continuation_yield_intrinsic()) {
1333 mh->_i2i_entry = mh->get_i2c_entry();
1334 } else {
1335 guarantee(false, "Unknown Continuation native intrinsic");
1336 }
1337 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1338 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1339 } else if (!mh->is_method_handle_intrinsic()) {
1340 // Instantly compiled code can execute.
1341 mh->_from_interpreted_entry = mh->get_i2c_entry();
1342 }
1343 }
1344
1345
1346 bool Method::is_overridden_in(Klass* k) const {
1347 InstanceKlass* ik = InstanceKlass::cast(k);
1348
1349 if (ik->is_interface()) return false;
1350
1351 // If method is an interface, we skip it - except if it
1352 // is a miranda method
1353 if (method_holder()->is_interface()) {
1354 // Check that method is not a miranda method
1355 if (ik->lookup_method(name(), signature()) == nullptr) {
1356 // No implementation exist - so miranda method
1357 return false;
1358 }
1359 return true;
1360 }
1361
1362 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1363 if (!has_vtable_index()) {
1364 return false;
1365 } else {
1366 Method* vt_m = ik->method_at_vtable(vtable_index());
1367 return vt_m != this;
1368 }
1369 }
1370
1371
1372 // give advice about whether this Method* should be cached or not
1373 bool Method::should_not_be_cached() const {
1374 if (is_old()) {
1375 // This method has been redefined. It is either EMCP or obsolete
1376 // and we don't want to cache it because that would pin the method
1377 // down and prevent it from being collectible if and when it
1378 // finishes executing.
1379 return true;
1380 }
1381
1382 // caching this method should be just fine
1383 return false;
1384 }
1385
1386
1387 /**
1388 * Returns true if this is one of the specially treated methods for
1389 * security related stack walks (like Reflection.getCallerClass).
1390 */
1391 bool Method::is_ignored_by_security_stack_walk() const {
1392 if (intrinsic_id() == vmIntrinsics::_invoke) {
1393 // This is Method.invoke() -- ignore it
1394 return true;
1395 }
1396 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1397 // This is an auxiliary frame -- ignore it
1398 return true;
1399 }
1400 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1401 // This is an internal adapter frame for method handles -- ignore it
1402 return true;
1403 }
1404 return false;
1405 }
1406
1407
1408 // Constant pool structure for invoke methods:
1409 enum {
1410 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1411 _imcp_invoke_signature, // utf8: (variable Symbol*)
1412 _imcp_limit
1413 };
1414
1415 // Test if this method is an MH adapter frame generated by Java code.
1416 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1417 bool Method::is_compiled_lambda_form() const {
1418 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1419 }
1420
1421 // Test if this method is an internal MH primitive method.
1422 bool Method::is_method_handle_intrinsic() const {
1423 vmIntrinsics::ID iid = intrinsic_id();
1424 return (MethodHandles::is_signature_polymorphic(iid) &&
1425 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1426 }
1427
1428 bool Method::has_member_arg() const {
1429 vmIntrinsics::ID iid = intrinsic_id();
1430 return (MethodHandles::is_signature_polymorphic(iid) &&
1431 MethodHandles::has_member_arg(iid));
1432 }
1433
1434 // Make an instance of a signature-polymorphic internal MH primitive.
1435 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1436 Symbol* signature,
1437 TRAPS) {
1438 ResourceMark rm(THREAD);
1439 methodHandle empty;
1440
1441 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1442 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1443 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1444
1445 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1446
1447 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1448 name->increment_refcount();
1449 signature->increment_refcount();
1450
1451 int cp_length = _imcp_limit;
1452 ClassLoaderData* loader_data = holder->class_loader_data();
1453 constantPoolHandle cp;
1454 {
1455 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1456 cp = constantPoolHandle(THREAD, cp_oop);
1457 }
1458 cp->copy_fields(holder->constants());
1459 cp->set_pool_holder(holder);
1460 cp->symbol_at_put(_imcp_invoke_name, name);
1461 cp->symbol_at_put(_imcp_invoke_signature, signature);
1462 cp->set_has_preresolution();
1463
1464 // decide on access bits: public or not?
1465 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1466 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1467 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1468 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1469
1470 methodHandle m;
1471 {
1472 InlineTableSizes sizes;
1473 Method* m_oop = Method::allocate(loader_data, 0,
1474 accessFlags_from(flags_bits), &sizes,
1475 ConstMethod::NORMAL,
1476 name,
1477 CHECK_(empty));
1478 m = methodHandle(THREAD, m_oop);
1479 }
1480 m->set_constants(cp());
1481 m->set_name_index(_imcp_invoke_name);
1482 m->set_signature_index(_imcp_invoke_signature);
1483 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1484 assert(m->signature() == signature, "");
1485 m->constMethod()->compute_from_signature(signature, must_be_static);
1486 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1487 assert(m->is_method_handle_intrinsic(), "");
1488 #ifdef ASSERT
1489 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1490 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1491 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1492 #endif //ASSERT
1493
1494 // Finally, set up its entry points.
1495 assert(m->can_be_statically_bound(), "");
1496 m->set_vtable_index(Method::nonvirtual_vtable_index);
1497 m->link_method(m, CHECK_(empty));
1498
1499 if (iid == vmIntrinsics::_linkToNative) {
1500 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1501 }
1502 if (log_is_enabled(Debug, methodhandles)) {
1503 LogTarget(Debug, methodhandles) lt;
1504 LogStream ls(lt);
1505 m->print_on(&ls);
1506 }
1507
1508 return m;
1509 }
1510
1511 Klass* Method::check_non_bcp_klass(Klass* klass) {
1512 if (klass != nullptr && klass->class_loader() != nullptr) {
1513 if (klass->is_objArray_klass())
1514 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1515 return klass;
1516 }
1517 return nullptr;
1518 }
1519
1520
1521 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1522 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1523 // Code below does not work for native methods - they should never get rewritten anyway
1524 assert(!m->is_native(), "cannot rewrite native methods");
1525 // Allocate new Method*
1526 AccessFlags flags = m->access_flags();
1527
1528 ConstMethod* cm = m->constMethod();
1529 int checked_exceptions_len = cm->checked_exceptions_length();
1530 int localvariable_len = cm->localvariable_table_length();
1531 int exception_table_len = cm->exception_table_length();
1532 int method_parameters_len = cm->method_parameters_length();
1533 int method_annotations_len = cm->method_annotations_length();
1534 int parameter_annotations_len = cm->parameter_annotations_length();
1535 int type_annotations_len = cm->type_annotations_length();
1536 int default_annotations_len = cm->default_annotations_length();
1537
1538 InlineTableSizes sizes(
1539 localvariable_len,
1540 new_compressed_linenumber_size,
1541 exception_table_len,
1542 checked_exceptions_len,
1543 method_parameters_len,
1544 cm->generic_signature_index(),
1545 method_annotations_len,
1546 parameter_annotations_len,
1547 type_annotations_len,
1548 default_annotations_len,
1549 0);
1550
1551 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1552 Method* newm_oop = Method::allocate(loader_data,
1553 new_code_length,
1554 flags,
1555 &sizes,
1556 m->method_type(),
1557 m->name(),
1558 CHECK_(methodHandle()));
1559 methodHandle newm (THREAD, newm_oop);
1560
1561 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1562 ConstMethod* newcm = newm->constMethod();
1563 int new_const_method_size = newm->constMethod()->size();
1564
1565 // This works because the source and target are both Methods. Some compilers
1566 // (e.g., clang) complain that the target vtable pointer will be stomped,
1567 // so cast away newm()'s and m()'s Methodness.
1568 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1569
1570 // Create shallow copy of ConstMethod.
1571 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1572
1573 // Reset correct method/const method, method size, and parameter info
1574 newm->set_constMethod(newcm);
1575 newm->constMethod()->set_code_size(new_code_length);
1576 newm->constMethod()->set_constMethod_size(new_const_method_size);
1577 assert(newm->code_size() == new_code_length, "check");
1578 assert(newm->method_parameters_length() == method_parameters_len, "check");
1579 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1580 assert(newm->exception_table_length() == exception_table_len, "check");
1581 assert(newm->localvariable_table_length() == localvariable_len, "check");
1582 // Copy new byte codes
1583 memcpy(newm->code_base(), new_code, new_code_length);
1584 // Copy line number table
1585 if (new_compressed_linenumber_size > 0) {
1586 memcpy(newm->compressed_linenumber_table(),
1587 new_compressed_linenumber_table,
1588 new_compressed_linenumber_size);
1589 }
1590 // Copy method_parameters
1591 if (method_parameters_len > 0) {
1592 memcpy(newm->method_parameters_start(),
1593 m->method_parameters_start(),
1594 method_parameters_len * sizeof(MethodParametersElement));
1595 }
1596 // Copy checked_exceptions
1597 if (checked_exceptions_len > 0) {
1598 memcpy(newm->checked_exceptions_start(),
1599 m->checked_exceptions_start(),
1600 checked_exceptions_len * sizeof(CheckedExceptionElement));
1601 }
1602 // Copy exception table
1603 if (exception_table_len > 0) {
1604 memcpy(newm->exception_table_start(),
1605 m->exception_table_start(),
1606 exception_table_len * sizeof(ExceptionTableElement));
1607 }
1608 // Copy local variable number table
1609 if (localvariable_len > 0) {
1610 memcpy(newm->localvariable_table_start(),
1611 m->localvariable_table_start(),
1612 localvariable_len * sizeof(LocalVariableTableElement));
1613 }
1614 // Copy stackmap table
1615 if (m->has_stackmap_table()) {
1616 int code_attribute_length = m->stackmap_data()->length();
1617 Array<u1>* stackmap_data =
1618 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1619 memcpy((void*)stackmap_data->adr_at(0),
1620 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1621 newm->set_stackmap_data(stackmap_data);
1622 }
1623
1624 // copy annotations over to new method
1625 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1626 return newm;
1627 }
1628
1629 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1630 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1631 // because we are not loading from core libraries
1632 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1633 // which does not use the class default class loader so we check for its loader here
1634 const InstanceKlass* ik = InstanceKlass::cast(holder);
1635 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1636 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1637 }
1638
1639 // see if the klass name is well-known:
1640 Symbol* klass_name = ik->name();
1641 vmSymbolID id = vmSymbols::find_sid(klass_name);
1642 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1643 return id;
1644 } else {
1645 return vmSymbolID::NO_SID;
1646 }
1647 }
1648
1649 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1650 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1651 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1652 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1653 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1654
1655 // the klass name is well-known:
1656 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1657 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1658
1659 // ditto for method and signature:
1660 vmSymbolID name_id = vmSymbols::find_sid(name());
1661 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1662 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1663 && name_id == vmSymbolID::NO_SID) {
1664 return;
1665 }
1666 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1667 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1668 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1669 && sig_id == vmSymbolID::NO_SID) {
1670 return;
1671 }
1672 jshort flags = access_flags().as_short();
1673
1674 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1675 if (id != vmIntrinsics::_none) {
1676 set_intrinsic_id(id);
1677 if (id == vmIntrinsics::_Class_cast) {
1678 // Even if the intrinsic is rejected, we want to inline this simple method.
1679 set_force_inline();
1680 }
1681 return;
1682 }
1683
1684 // A few slightly irregular cases:
1685 switch (klass_id) {
1686 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1687 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1688 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1689 if (!is_native()) break;
1690 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1691 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1692 id = vmIntrinsics::_none;
1693 break;
1694
1695 default:
1696 break;
1697 }
1698
1699 if (id != vmIntrinsics::_none) {
1700 // Set up its iid. It is an alias method.
1701 set_intrinsic_id(id);
1702 return;
1703 }
1704 }
1705
1706 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1707 if (!THREAD->can_call_java()) {
1708 // There is nothing useful this routine can do from within the Compile thread.
1709 // Hopefully, the signature contains only well-known classes.
1710 // We could scan for this and return true/false, but the caller won't care.
1711 return false;
1712 }
1713 bool sig_is_loaded = true;
1714 ResourceMark rm(THREAD);
1715 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1716 if (ss.is_reference()) {
1717 // load everything, including arrays "[Lfoo;"
1718 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1719 // We are loading classes eagerly. If a ClassNotFoundException or
1720 // a LinkageError was generated, be sure to ignore it.
1721 if (HAS_PENDING_EXCEPTION) {
1722 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1723 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1724 CLEAR_PENDING_EXCEPTION;
1725 } else {
1726 return false;
1727 }
1728 }
1729 if( klass == nullptr) { sig_is_loaded = false; }
1730 }
1731 }
1732 return sig_is_loaded;
1733 }
1734
1735 // Exposed so field engineers can debug VM
1736 void Method::print_short_name(outputStream* st) const {
1737 ResourceMark rm;
1738 #ifdef PRODUCT
1739 st->print(" %s::", method_holder()->external_name());
1740 #else
1741 st->print(" %s::", method_holder()->internal_name());
1742 #endif
1743 name()->print_symbol_on(st);
1744 if (WizardMode) signature()->print_symbol_on(st);
1745 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1746 MethodHandles::print_as_basic_type_signature_on(st, signature());
1747 }
1748
1749 // Comparer for sorting an object array containing
1750 // Method*s.
1751 static int method_comparator(Method* a, Method* b) {
1752 return a->name()->fast_compare(b->name());
1753 }
1754
1755 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1756 // default_methods also uses this without the ordering for fast find_method
1757 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1758 int length = methods->length();
1759 if (length > 1) {
1760 if (func == nullptr) {
1761 func = method_comparator;
1762 }
1763 {
1764 NoSafepointVerifier nsv;
1765 QuickSort::sort(methods->data(), length, func, /*idempotent=*/false);
1766 }
1767 // Reset method ordering
1768 if (set_idnums) {
1769 for (u2 i = 0; i < length; i++) {
1770 Method* m = methods->at(i);
1771 m->set_method_idnum(i);
1772 m->set_orig_method_idnum(i);
1773 }
1774 }
1775 }
1776 }
1777
1778 //-----------------------------------------------------------------------------------
1779 // Non-product code unless JVM/TI needs it
1780
1781 #if !defined(PRODUCT) || INCLUDE_JVMTI
1782 class SignatureTypePrinter : public SignatureTypeNames {
1783 private:
1784 outputStream* _st;
1785 bool _use_separator;
1786
1787 void type_name(const char* name) {
1788 if (_use_separator) _st->print(", ");
1789 _st->print("%s", name);
1790 _use_separator = true;
1791 }
1792
1793 public:
1794 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1795 _st = st;
1796 _use_separator = false;
1797 }
1798
1799 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1800 void print_returntype() { _use_separator = false; do_type(return_type()); }
1801 };
1802
1803
1804 void Method::print_name(outputStream* st) const {
1805 Thread *thread = Thread::current();
1806 ResourceMark rm(thread);
1807 st->print("%s ", is_static() ? "static" : "virtual");
1808 if (WizardMode) {
1809 st->print("%s.", method_holder()->internal_name());
1810 name()->print_symbol_on(st);
1811 signature()->print_symbol_on(st);
1812 } else {
1813 SignatureTypePrinter sig(signature(), st);
1814 sig.print_returntype();
1815 st->print(" %s.", method_holder()->internal_name());
1816 name()->print_symbol_on(st);
1817 st->print("(");
1818 sig.print_parameters();
1819 st->print(")");
1820 }
1821 }
1822 #endif // !PRODUCT || INCLUDE_JVMTI
1823
1824
1825 void Method::print_codes_on(outputStream* st, int flags) const {
1826 print_codes_on(0, code_size(), st, flags);
1827 }
1828
1829 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1830 Thread *thread = Thread::current();
1831 ResourceMark rm(thread);
1832 methodHandle mh (thread, (Method*)this);
1833 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1834 }
1835
1836 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1837 _bci = 0;
1838 _line = 0;
1839 };
1840
1841 bool CompressedLineNumberReadStream::read_pair() {
1842 jubyte next = read_byte();
1843 // Check for terminator
1844 if (next == 0) return false;
1845 if (next == 0xFF) {
1846 // Escape character, regular compression used
1847 _bci += read_signed_int();
1848 _line += read_signed_int();
1849 } else {
1850 // Single byte compression used
1851 _bci += next >> 3;
1852 _line += next & 0x7;
1853 }
1854 return true;
1855 }
1856
1857 #if INCLUDE_JVMTI
1858
1859 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1860 BreakpointInfo* bp = method_holder()->breakpoints();
1861 for (; bp != nullptr; bp = bp->next()) {
1862 if (bp->match(this, bci)) {
1863 return bp->orig_bytecode();
1864 }
1865 }
1866 {
1867 ResourceMark rm;
1868 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1869 }
1870 return Bytecodes::_shouldnotreachhere;
1871 }
1872
1873 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1874 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1875 BreakpointInfo* bp = method_holder()->breakpoints();
1876 for (; bp != nullptr; bp = bp->next()) {
1877 if (bp->match(this, bci)) {
1878 bp->set_orig_bytecode(code);
1879 // and continue, in case there is more than one
1880 }
1881 }
1882 }
1883
1884 void Method::set_breakpoint(int bci) {
1885 InstanceKlass* ik = method_holder();
1886 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1887 bp->set_next(ik->breakpoints());
1888 ik->set_breakpoints(bp);
1889 // do this last:
1890 bp->set(this);
1891 }
1892
1893 static void clear_matches(Method* m, int bci) {
1894 InstanceKlass* ik = m->method_holder();
1895 BreakpointInfo* prev_bp = nullptr;
1896 BreakpointInfo* next_bp;
1897 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1898 next_bp = bp->next();
1899 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1900 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1901 // do this first:
1902 bp->clear(m);
1903 // unhook it
1904 if (prev_bp != nullptr)
1905 prev_bp->set_next(next_bp);
1906 else
1907 ik->set_breakpoints(next_bp);
1908 delete bp;
1909 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1910 // at same location. So we have multiple matching (method_index and bci)
1911 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1912 // breakpoint for clear_breakpoint request and keep all other method versions
1913 // BreakpointInfo for future clear_breakpoint request.
1914 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1915 // which is being called when class is unloaded. We delete all the Breakpoint
1916 // information for all versions of method. We may not correctly restore the original
1917 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1918 // so these methods won't be used anymore.
1919 if (bci >= 0) {
1920 break;
1921 }
1922 } else {
1923 // This one is a keeper.
1924 prev_bp = bp;
1925 }
1926 }
1927 }
1928
1929 void Method::clear_breakpoint(int bci) {
1930 assert(bci >= 0, "");
1931 clear_matches(this, bci);
1932 }
1933
1934 void Method::clear_all_breakpoints() {
1935 clear_matches(this, -1);
1936 }
1937
1938 #endif // INCLUDE_JVMTI
1939
1940 int Method::invocation_count() const {
1941 MethodCounters* mcs = method_counters();
1942 MethodData* mdo = method_data();
1943 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) ||
1944 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) {
1945 return InvocationCounter::count_limit;
1946 } else {
1947 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) +
1948 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0);
1949 }
1950 }
1951
1952 int Method::backedge_count() const {
1953 MethodCounters* mcs = method_counters();
1954 MethodData* mdo = method_data();
1955 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) ||
1956 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) {
1957 return InvocationCounter::count_limit;
1958 } else {
1959 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) +
1960 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0);
1961 }
1962 }
1963
1964 int Method::highest_comp_level() const {
1965 const MethodCounters* mcs = method_counters();
1966 if (mcs != nullptr) {
1967 return mcs->highest_comp_level();
1968 } else {
1969 return CompLevel_none;
1970 }
1971 }
1972
1973 int Method::highest_osr_comp_level() const {
1974 const MethodCounters* mcs = method_counters();
1975 if (mcs != nullptr) {
1976 return mcs->highest_osr_comp_level();
1977 } else {
1978 return CompLevel_none;
1979 }
1980 }
1981
1982 void Method::set_highest_comp_level(int level) {
1983 MethodCounters* mcs = method_counters();
1984 if (mcs != nullptr) {
1985 mcs->set_highest_comp_level(level);
1986 }
1987 }
1988
1989 void Method::set_highest_osr_comp_level(int level) {
1990 MethodCounters* mcs = method_counters();
1991 if (mcs != nullptr) {
1992 mcs->set_highest_osr_comp_level(level);
1993 }
1994 }
1995
1996 #if INCLUDE_JVMTI
1997
1998 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1999 _bci = bci;
2000 _name_index = m->name_index();
2001 _signature_index = m->signature_index();
2002 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2003 if (_orig_bytecode == Bytecodes::_breakpoint)
2004 _orig_bytecode = m->orig_bytecode_at(_bci);
2005 _next = nullptr;
2006 }
2007
2008 void BreakpointInfo::set(Method* method) {
2009 #ifdef ASSERT
2010 {
2011 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2012 if (code == Bytecodes::_breakpoint)
2013 code = method->orig_bytecode_at(_bci);
2014 assert(orig_bytecode() == code, "original bytecode must be the same");
2015 }
2016 #endif
2017 Thread *thread = Thread::current();
2018 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2019 method->incr_number_of_breakpoints(thread);
2020 {
2021 // Deoptimize all dependents on this method
2022 HandleMark hm(thread);
2023 methodHandle mh(thread, method);
2024 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2025 }
2026 }
2027
2028 void BreakpointInfo::clear(Method* method) {
2029 *method->bcp_from(_bci) = orig_bytecode();
2030 assert(method->number_of_breakpoints() > 0, "must not go negative");
2031 method->decr_number_of_breakpoints(Thread::current());
2032 }
2033
2034 #endif // INCLUDE_JVMTI
2035
2036 // jmethodID handling
2037
2038 // This is a block allocating object, sort of like JNIHandleBlock, only a
2039 // lot simpler.
2040 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2041 // never get rid of it.
2042
2043 static const int min_block_size = 8;
2044
2045 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2046 friend class JNIMethodBlock;
2047 Method** _methods;
2048 int _number_of_methods;
2049 int _top;
2050 JNIMethodBlockNode* _next;
2051
2052 public:
2053
2054 JNIMethodBlockNode(int num_methods = min_block_size);
2055
2056 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2057
2058 void ensure_methods(int num_addl_methods) {
2059 if (_top < _number_of_methods) {
2060 num_addl_methods -= _number_of_methods - _top;
2061 if (num_addl_methods <= 0) {
2062 return;
2063 }
2064 }
2065 if (_next == nullptr) {
2066 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2067 } else {
2068 _next->ensure_methods(num_addl_methods);
2069 }
2070 }
2071 };
2072
2073 class JNIMethodBlock : public CHeapObj<mtClass> {
2074 JNIMethodBlockNode _head;
2075 JNIMethodBlockNode *_last_free;
2076 public:
2077 static Method* const _free_method;
2078
2079 JNIMethodBlock(int initial_capacity = min_block_size)
2080 : _head(initial_capacity), _last_free(&_head) {}
2081
2082 void ensure_methods(int num_addl_methods) {
2083 _last_free->ensure_methods(num_addl_methods);
2084 }
2085
2086 Method** add_method(Method* m) {
2087 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2088 if (b->_top < b->_number_of_methods) {
2089 // top points to the next free entry.
2090 int i = b->_top;
2091 b->_methods[i] = m;
2092 b->_top++;
2093 _last_free = b;
2094 return &(b->_methods[i]);
2095 } else if (b->_top == b->_number_of_methods) {
2096 // if the next free entry ran off the block see if there's a free entry
2097 for (int i = 0; i < b->_number_of_methods; i++) {
2098 if (b->_methods[i] == _free_method) {
2099 b->_methods[i] = m;
2100 _last_free = b;
2101 return &(b->_methods[i]);
2102 }
2103 }
2104 // Only check each block once for frees. They're very unlikely.
2105 // Increment top past the end of the block.
2106 b->_top++;
2107 }
2108 // need to allocate a next block.
2109 if (b->_next == nullptr) {
2110 b->_next = _last_free = new JNIMethodBlockNode();
2111 }
2112 }
2113 guarantee(false, "Should always allocate a free block");
2114 return nullptr;
2115 }
2116
2117 bool contains(Method** m) {
2118 if (m == nullptr) return false;
2119 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2120 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2121 // This is a bit of extra checking, for two reasons. One is
2122 // that contains() deals with pointers that are passed in by
2123 // JNI code, so making sure that the pointer is aligned
2124 // correctly is valuable. The other is that <= and > are
2125 // technically not defined on pointers, so the if guard can
2126 // pass spuriously; no modern compiler is likely to make that
2127 // a problem, though (and if one did, the guard could also
2128 // fail spuriously, which would be bad).
2129 ptrdiff_t idx = m - b->_methods;
2130 if (b->_methods + idx == m) {
2131 return true;
2132 }
2133 }
2134 }
2135 return false; // not found
2136 }
2137
2138 // Doesn't really destroy it, just marks it as free so it can be reused.
2139 void destroy_method(Method** m) {
2140 #ifdef ASSERT
2141 assert(contains(m), "should be a methodID");
2142 #endif // ASSERT
2143 *m = _free_method;
2144 }
2145
2146 // During class unloading the methods are cleared, which is different
2147 // than freed.
2148 void clear_all_methods() {
2149 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2150 for (int i = 0; i< b->_number_of_methods; i++) {
2151 b->_methods[i] = nullptr;
2152 }
2153 }
2154 }
2155 #ifndef PRODUCT
2156 int count_methods() {
2157 // count all allocated methods
2158 int count = 0;
2159 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2160 for (int i = 0; i< b->_number_of_methods; i++) {
2161 if (b->_methods[i] != _free_method) count++;
2162 }
2163 }
2164 return count;
2165 }
2166 #endif // PRODUCT
2167 };
2168
2169 // Something that can't be mistaken for an address or a markWord
2170 Method* const JNIMethodBlock::_free_method = (Method*)55;
2171
2172 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2173 _number_of_methods = MAX2(num_methods, min_block_size);
2174 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2175 for (int i = 0; i < _number_of_methods; i++) {
2176 _methods[i] = JNIMethodBlock::_free_method;
2177 }
2178 }
2179
2180 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2181 // Have to add jmethod_ids() to class loader data thread-safely.
2182 // Also have to add the method to the list safely, which the lock
2183 // protects as well.
2184 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2185 if (cld->jmethod_ids() == nullptr) {
2186 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2187 } else {
2188 cld->jmethod_ids()->ensure_methods(capacity);
2189 }
2190 }
2191
2192 // Add a method id to the jmethod_ids
2193 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2194 // Have to add jmethod_ids() to class loader data thread-safely.
2195 // Also have to add the method to the list safely, which the lock
2196 // protects as well.
2197 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2198 if (cld->jmethod_ids() == nullptr) {
2199 cld->set_jmethod_ids(new JNIMethodBlock());
2200 }
2201 // jmethodID is a pointer to Method*
2202 return (jmethodID)cld->jmethod_ids()->add_method(m);
2203 }
2204
2205 jmethodID Method::jmethod_id() {
2206 methodHandle mh(Thread::current(), this);
2207 return method_holder()->get_jmethod_id(mh);
2208 }
2209
2210 // Mark a jmethodID as free. This is called when there is a data race in
2211 // InstanceKlass while creating the jmethodID cache.
2212 void Method::destroy_jmethod_id(ClassLoaderData* cld, jmethodID m) {
2213 Method** ptr = (Method**)m;
2214 assert(cld->jmethod_ids() != nullptr, "should have method handles");
2215 cld->jmethod_ids()->destroy_method(ptr);
2216 }
2217
2218 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2219 // Can't assert the method_holder is the same because the new method has the
2220 // scratch method holder.
2221 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2222 == new_method->method_holder()->class_loader() ||
2223 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2224 "changing to a different class loader");
2225 // Just change the method in place, jmethodID pointer doesn't change.
2226 *((Method**)jmid) = new_method;
2227 }
2228
2229 bool Method::is_method_id(jmethodID mid) {
2230 Method* m = resolve_jmethod_id(mid);
2231 assert(m != nullptr, "should be called with non-null method");
2232 InstanceKlass* ik = m->method_holder();
2233 ClassLoaderData* cld = ik->class_loader_data();
2234 if (cld->jmethod_ids() == nullptr) return false;
2235 return (cld->jmethod_ids()->contains((Method**)mid));
2236 }
2237
2238 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2239 if (mid == nullptr) return nullptr;
2240 Method* o = resolve_jmethod_id(mid);
2241 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2242 return nullptr;
2243 }
2244 // Method should otherwise be valid. Assert for testing.
2245 assert(is_valid_method(o), "should be valid jmethodid");
2246 // If the method's class holder object is unreferenced, but not yet marked as
2247 // unloaded, we need to return null here too because after a safepoint, its memory
2248 // will be reclaimed.
2249 return o->method_holder()->is_loader_alive() ? o : nullptr;
2250 };
2251
2252 void Method::set_on_stack(const bool value) {
2253 // Set both the method itself and its constant pool. The constant pool
2254 // on stack means some method referring to it is also on the stack.
2255 constants()->set_on_stack(value);
2256
2257 bool already_set = on_stack_flag();
2258 set_on_stack_flag(value);
2259 if (value && !already_set) {
2260 MetadataOnStackMark::record(this);
2261 }
2262 }
2263
2264 void Method::record_gc_epoch() {
2265 // If any method is on the stack in continuations, none of them can be reclaimed,
2266 // so save the marking cycle to check for the whole class in the cpCache.
2267 // The cpCache is writeable.
2268 constants()->cache()->record_gc_epoch();
2269 }
2270
2271 // Called when the class loader is unloaded to make all methods weak.
2272 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2273 loader_data->jmethod_ids()->clear_all_methods();
2274 }
2275
2276 void Method::clear_jmethod_id() {
2277 // Being at a safepoint prevents racing against other class redefinitions
2278 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2279 // The jmethodID is not stored in the Method instance, we need to look it up first
2280 jmethodID methodid = find_jmethod_id_or_null();
2281 // We need to make sure that jmethodID actually resolves to this method
2282 // - multiple redefined versions may share jmethodID slots and if a method
2283 // has already been rewired to a newer version we could be removing reference
2284 // to a still existing method instance
2285 if (methodid != nullptr && *((Method**)methodid) == this) {
2286 *((Method**)methodid) = nullptr;
2287 }
2288 }
2289
2290 bool Method::has_method_vptr(const void* ptr) {
2291 Method m;
2292 // This assumes that the vtbl pointer is the first word of a C++ object.
2293 return dereference_vptr(&m) == dereference_vptr(ptr);
2294 }
2295
2296 // Check that this pointer is valid by checking that the vtbl pointer matches
2297 bool Method::is_valid_method(const Method* m) {
2298 if (m == nullptr) {
2299 return false;
2300 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2301 // Quick sanity check on pointer.
2302 return false;
2303 } else if (!os::is_readable_range(m, m + 1)) {
2304 return false;
2305 } else if (m->is_shared()) {
2306 return CppVtables::is_valid_shared_method(m);
2307 } else if (Metaspace::contains_non_shared(m)) {
2308 return has_method_vptr((const void*)m);
2309 } else {
2310 return false;
2311 }
2312 }
2313
2314 #ifndef PRODUCT
2315 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2316 out->print("%d", loader_data->jmethod_ids()->count_methods());
2317 }
2318 #endif // PRODUCT
2319
2320
2321 // Printing
2322
2323 #ifndef PRODUCT
2324
2325 void Method::print_on(outputStream* st) const {
2326 ResourceMark rm;
2327 assert(is_method(), "must be method");
2328 st->print_cr("%s", internal_name());
2329 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2330 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2331 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2332 constants()->print_value_on(st); st->cr();
2333 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2334 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2335 st->print (" - name: "); name()->print_value_on(st); st->cr();
2336 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2337 st->print_cr(" - max stack: %d", max_stack());
2338 st->print_cr(" - max locals: %d", max_locals());
2339 st->print_cr(" - size of params: %d", size_of_parameters());
2340 st->print_cr(" - method size: %d", method_size());
2341 if (intrinsic_id() != vmIntrinsics::_none)
2342 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2343 if (highest_comp_level() != CompLevel_none)
2344 st->print_cr(" - highest level: %d", highest_comp_level());
2345 st->print_cr(" - vtable index: %d", _vtable_index);
2346 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2347 st->print( " - adapters: ");
2348 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2349 if (a == nullptr)
2350 st->print_cr(PTR_FORMAT, p2i(a));
2351 else
2352 a->print_adapter_on(st);
2353 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2354 st->print_cr(" - code size: %d", code_size());
2355 if (code_size() != 0) {
2356 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2357 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2358 }
2359 if (method_data() != nullptr) {
2360 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2361 }
2362 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2363 if (checked_exceptions_length() > 0) {
2364 CheckedExceptionElement* table = checked_exceptions_start();
2365 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2366 if (Verbose) {
2367 for (int i = 0; i < checked_exceptions_length(); i++) {
2368 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2369 }
2370 }
2371 }
2372 if (has_linenumber_table()) {
2373 u_char* table = compressed_linenumber_table();
2374 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2375 if (Verbose) {
2376 CompressedLineNumberReadStream stream(table);
2377 while (stream.read_pair()) {
2378 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2379 }
2380 }
2381 }
2382 st->print_cr(" - localvar length: %d", localvariable_table_length());
2383 if (localvariable_table_length() > 0) {
2384 LocalVariableTableElement* table = localvariable_table_start();
2385 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2386 if (Verbose) {
2387 for (int i = 0; i < localvariable_table_length(); i++) {
2388 int bci = table[i].start_bci;
2389 int len = table[i].length;
2390 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2391 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2392 int slot = table[i].slot;
2393 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2394 }
2395 }
2396 }
2397 if (code() != nullptr) {
2398 st->print (" - compiled code: ");
2399 code()->print_value_on(st);
2400 }
2401 if (is_native()) {
2402 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2403 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2404 }
2405 }
2406
2407 void Method::print_linkage_flags(outputStream* st) {
2408 access_flags().print_on(st);
2409 if (is_default_method()) {
2410 st->print("default ");
2411 }
2412 if (is_overpass()) {
2413 st->print("overpass ");
2414 }
2415 }
2416 #endif //PRODUCT
2417
2418 void Method::print_value_on(outputStream* st) const {
2419 assert(is_method(), "must be method");
2420 st->print("%s", internal_name());
2421 print_address_on(st);
2422 st->print(" ");
2423 name()->print_value_on(st);
2424 st->print(" ");
2425 signature()->print_value_on(st);
2426 st->print(" in ");
2427 method_holder()->print_value_on(st);
2428 if (WizardMode) st->print("#%d", _vtable_index);
2429 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2430 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2431 }
2432
2433 // Verification
2434
2435 void Method::verify_on(outputStream* st) {
2436 guarantee(is_method(), "object must be method");
2437 guarantee(constants()->is_constantPool(), "should be constant pool");
2438 MethodData* md = method_data();
2439 guarantee(md == nullptr ||
2440 md->is_methodData(), "should be method data");
2441 }