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/classLoaderDataGraph.hpp"
30 #include "classfile/metadataOnStackMark.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmClasses.hpp"
34 #include "code/codeCache.hpp"
35 #include "code/debugInfoRec.hpp"
36 #include "compiler/compilationPolicy.hpp"
37 #include "gc/shared/collectedHeap.inline.hpp"
38 #include "interpreter/bytecodeStream.hpp"
39 #include "interpreter/bytecodeTracer.hpp"
40 #include "interpreter/bytecodes.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/metaspaceClosure.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "nmt/memTracker.hpp"
53 #include "oops/constMethod.hpp"
54 #include "oops/constantPool.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/methodData.hpp"
58 #include "oops/objArrayKlass.hpp"
59 #include "oops/objArrayOop.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/symbol.hpp"
62 #include "oops/inlineKlass.inline.hpp"
63 #include "prims/jvmtiExport.hpp"
64 #include "prims/methodHandles.hpp"
65 #include "runtime/atomic.hpp"
66 #include "runtime/continuationEntry.hpp"
67 #include "runtime/frame.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/init.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/orderAccess.hpp"
72 #include "runtime/relocator.hpp"
73 #include "runtime/safepointVerifiers.hpp"
74 #include "runtime/sharedRuntime.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/threads.hpp"
77 #include "runtime/vm_version.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/quickSort.hpp"
80 #include "utilities/vmError.hpp"
81 #include "utilities/xmlstream.hpp"
82
83 // Implementation of Method
84
85 Method* Method::allocate(ClassLoaderData* loader_data,
86 int byte_code_size,
87 AccessFlags access_flags,
88 InlineTableSizes* sizes,
89 ConstMethod::MethodType method_type,
90 Symbol* name,
91 TRAPS) {
92 assert(!access_flags.is_native() || byte_code_size == 0,
93 "native methods should not contain byte codes");
94 ConstMethod* cm = ConstMethod::allocate(loader_data,
95 byte_code_size,
96 sizes,
97 method_type,
98 CHECK_NULL);
99 int size = Method::size(access_flags.is_native());
100 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
101 }
102
103 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
104 NoSafepointVerifier no_safepoint;
105 set_constMethod(xconst);
106 set_access_flags(access_flags);
107 set_intrinsic_id(vmIntrinsics::_none);
108 clear_method_data();
109 clear_method_counters();
110 set_vtable_index(Method::garbage_vtable_index);
111
112 // Fix and bury in Method*
113 set_interpreter_entry(nullptr); // sets i2i entry and from_int
114 set_adapter_entry(nullptr);
115 Method::clear_code(); // from_c/from_i get set to c2i/i2i
116
117 if (access_flags.is_native()) {
118 clear_native_function();
119 set_signature_handler(nullptr);
120 }
121 NOT_PRODUCT(set_compiled_invocation_count(0);)
122 // Name is very useful for debugging.
123 NOT_PRODUCT(_name = name;)
124 }
125
126 // Release Method*. The nmethod will be gone when we get here because
127 // we've walked the code cache.
128 void Method::deallocate_contents(ClassLoaderData* loader_data) {
129 MetadataFactory::free_metadata(loader_data, constMethod());
130 set_constMethod(nullptr);
131 MetadataFactory::free_metadata(loader_data, method_data());
132 clear_method_data();
133 MetadataFactory::free_metadata(loader_data, method_counters());
134 clear_method_counters();
135 // The nmethod will be gone when we get here.
136 if (code() != nullptr) _code = nullptr;
137 }
138
139 void Method::release_C_heap_structures() {
140 if (method_data()) {
141 method_data()->release_C_heap_structures();
142
143 // Destroy MethodData embedded lock
144 method_data()->~MethodData();
145 }
146 }
147
148 address Method::get_i2c_entry() {
149 assert(adapter() != nullptr, "must have");
150 return adapter()->get_i2c_entry();
151 }
152
153 address Method::get_c2i_entry() {
154 assert(adapter() != nullptr, "must have");
155 return adapter()->get_c2i_entry();
156 }
157
158 address Method::get_c2i_inline_entry() {
159 assert(adapter() != nullptr, "must have");
160 return adapter()->get_c2i_inline_entry();
161 }
162
163 address Method::get_c2i_unverified_entry() {
164 assert(adapter() != nullptr, "must have");
165 return adapter()->get_c2i_unverified_entry();
166 }
167
168 address Method::get_c2i_unverified_inline_entry() {
169 assert(adapter() != nullptr, "must have");
170 return adapter()->get_c2i_unverified_inline_entry();
171 }
172
173 address Method::get_c2i_no_clinit_check_entry() {
174 assert(VM_Version::supports_fast_class_init_checks(), "");
175 assert(adapter() != nullptr, "must have");
176 return adapter()->get_c2i_no_clinit_check_entry();
177 }
178
179 char* Method::name_and_sig_as_C_string() const {
180 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
181 }
182
183 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
184 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
185 }
186
187 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
188 const char* klass_name = klass->external_name();
189 int klass_name_len = (int)strlen(klass_name);
190 int method_name_len = method_name->utf8_length();
191 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
192 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
193 strcpy(dest, klass_name);
194 dest[klass_name_len] = '.';
195 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
196 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
197 dest[len] = 0;
198 return dest;
199 }
200
201 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
202 Symbol* klass_name = klass->name();
203 klass_name->as_klass_external_name(buf, size);
204 int len = (int)strlen(buf);
205
206 if (len < size - 1) {
207 buf[len++] = '.';
208
209 method_name->as_C_string(&(buf[len]), size - len);
210 len = (int)strlen(buf);
211
212 signature->as_C_string(&(buf[len]), size - len);
213 }
214
215 return buf;
216 }
217
218 const char* Method::external_name() const {
219 return external_name(constants()->pool_holder(), name(), signature());
220 }
221
222 void Method::print_external_name(outputStream *os) const {
223 print_external_name(os, constants()->pool_holder(), name(), signature());
224 }
225
226 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
227 stringStream ss;
228 print_external_name(&ss, klass, method_name, signature);
229 return ss.as_string();
230 }
231
232 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
233 signature->print_as_signature_external_return_type(os);
234 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
235 signature->print_as_signature_external_parameters(os);
236 os->print(")");
237 }
238
239 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
240 if (log_is_enabled(Debug, exceptions)) {
241 ResourceMark rm(THREAD);
242 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
243 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
244 }
245 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
246 // access exception table
247 ExceptionTable table(mh());
248 int length = table.length();
249 // iterate through all entries sequentially
250 constantPoolHandle pool(THREAD, mh->constants());
251 for (int i = 0; i < length; i ++) {
252 //reacquire the table in case a GC happened
253 ExceptionTable table(mh());
254 int beg_bci = table.start_pc(i);
255 int end_bci = table.end_pc(i);
256 assert(beg_bci <= end_bci, "inconsistent exception table");
257 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
258 beg_bci, end_bci);
259
260 if (beg_bci <= throw_bci && throw_bci < end_bci) {
261 // exception handler bci range covers throw_bci => investigate further
262 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
263
264 int handler_bci = table.handler_pc(i);
265 int klass_index = table.catch_type_index(i);
266 if (klass_index == 0) {
267 if (log_is_enabled(Info, exceptions)) {
268 ResourceMark rm(THREAD);
269 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
270 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
271 }
272 return handler_bci;
273 } else if (ex_klass == nullptr) {
274 // Is this even possible?
275 if (log_is_enabled(Info, exceptions)) {
276 ResourceMark rm(THREAD);
277 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
278 mh()->name()->as_C_string(), handler_bci);
279 }
280 return handler_bci;
281 } else {
282 if (log_is_enabled(Debug, exceptions)) {
283 ResourceMark rm(THREAD);
284 log_debug(exceptions)(" - resolving catch type \"%s\"",
285 pool->klass_name_at(klass_index)->as_C_string());
286 }
287 // we know the exception class => get the constraint class
288 // this may require loading of the constraint class; if verification
289 // fails or some other exception occurs, return handler_bci
290 Klass* k = pool->klass_at(klass_index, THREAD);
291 if (HAS_PENDING_EXCEPTION) {
292 if (log_is_enabled(Debug, exceptions)) {
293 ResourceMark rm(THREAD);
294 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
295 PENDING_EXCEPTION->klass()->external_name());
296 }
297 return handler_bci;
298 }
299 assert(k != nullptr, "klass not loaded");
300 if (ex_klass->is_subtype_of(k)) {
301 if (log_is_enabled(Info, exceptions)) {
302 ResourceMark rm(THREAD);
303 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
304 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
305 }
306 return handler_bci;
307 }
308 }
309 }
310 }
311
312 if (log_is_enabled(Debug, exceptions)) {
313 ResourceMark rm(THREAD);
314 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
315 ex_klass->external_name(), mh->name()->as_C_string());
316 }
317
318 return -1;
319 }
320
321 void Method::mask_for(int bci, InterpreterOopMap* mask) {
322 methodHandle h_this(Thread::current(), this);
323 // Only GC uses the OopMapCache during thread stack root scanning
324 // any other uses generate an oopmap but do not save it in the cache.
325 if (Universe::heap()->is_gc_active()) {
326 method_holder()->mask_for(h_this, bci, mask);
327 } else {
328 OopMapCache::compute_one_oop_map(h_this, bci, mask);
329 }
330 return;
331 }
332
333
334 int Method::bci_from(address bcp) const {
335 if (is_native() && bcp == 0) {
336 return 0;
337 }
338 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
339 // may call this after interrupting a nested ResourceMark.
340 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
341 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
342
343 return int(bcp - code_base());
344 }
345
346
347 int Method::validate_bci(int bci) const {
348 return (bci == 0 || bci < code_size()) ? bci : -1;
349 }
350
351 // Return bci if it appears to be a valid bcp
352 // Return -1 otherwise.
353 // Used by profiling code, when invalid data is a possibility.
354 // The caller is responsible for validating the Method* itself.
355 int Method::validate_bci_from_bcp(address bcp) const {
356 // keep bci as -1 if not a valid bci
357 int bci = -1;
358 if (bcp == 0 || bcp == code_base()) {
359 // code_size() may return 0 and we allow 0 here
360 // the method may be native
361 bci = 0;
362 } else if (contains(bcp)) {
363 bci = int(bcp - code_base());
364 }
365 // Assert that if we have dodged any asserts, bci is negative.
366 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
367 return bci;
368 }
369
370 address Method::bcp_from(int bci) const {
371 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
372 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
373 address bcp = code_base() + bci;
374 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
375 return bcp;
376 }
377
378 address Method::bcp_from(address bcp) const {
379 if (is_native() && bcp == nullptr) {
380 return code_base();
381 } else {
382 return bcp;
383 }
384 }
385
386 int Method::size(bool is_native) {
387 // If native, then include pointers for native_function and signature_handler
388 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
389 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
390 return align_metadata_size(header_size() + extra_words);
391 }
392
393 Symbol* Method::klass_name() const {
394 return method_holder()->name();
395 }
396
397 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
398 log_trace(cds)("Iter(Method): %p", this);
399
400 if (!method_holder()->is_rewritten() || CDSConfig::is_valhalla_preview()) {
401 it->push(&_constMethod, MetaspaceClosure::_writable);
402 } else {
403 it->push(&_constMethod);
404 }
405 it->push(&_method_data);
406 it->push(&_method_counters);
407 NOT_PRODUCT(it->push(&_name);)
408 }
409
410 #if INCLUDE_CDS
411 // Attempt to return method to original state. Clear any pointers
412 // (to objects outside the shared spaces). We won't be able to predict
413 // where they should point in a new JVM. Further initialize some
414 // entries now in order allow them to be write protected later.
415
416 void Method::remove_unshareable_info() {
417 unlink_method();
418 JFR_ONLY(REMOVE_METHOD_ID(this);)
419 }
420
421 void Method::restore_unshareable_info(TRAPS) {
422 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
423 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
424 }
425 #endif
426
427 void Method::set_vtable_index(int index) {
428 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
429 // At runtime initialize_vtable 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.
432 return; // don't write into the shared class
433 } else {
434 _vtable_index = index;
435 }
436 }
437
438 void Method::set_itable_index(int index) {
439 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
440 // At runtime initialize_itable is rerun as part of link_class_impl()
441 // for a shared class loaded by the non-boot loader to obtain the loader
442 // constraints based on the runtime classloaders' context. The dumptime
443 // itable index should be the same as the runtime index.
444 assert(_vtable_index == itable_index_max - index,
445 "archived itable index is different from runtime index");
446 return; // don’t write into the shared class
447 } else {
448 _vtable_index = itable_index_max - index;
449 }
450 assert(valid_itable_index(), "");
451 }
452
453 // The RegisterNatives call being attempted tried to register with a method that
454 // is not native. Ask JVM TI what prefixes have been specified. Then check
455 // to see if the native method is now wrapped with the prefixes. See the
456 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
457 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
458 #if INCLUDE_JVMTI
459 ResourceMark rm(THREAD);
460 Method* method;
461 int name_len = name->utf8_length();
462 char* name_str = name->as_utf8();
463 int prefix_count;
464 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
465 for (int i = 0; i < prefix_count; i++) {
466 char* prefix = prefixes[i];
467 int prefix_len = (int)strlen(prefix);
468
469 // try adding this prefix to the method name and see if it matches another method name
470 int trial_len = name_len + prefix_len;
471 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
472 strcpy(trial_name_str, prefix);
473 strcat(trial_name_str, name_str);
474 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
475 if (trial_name == nullptr) {
476 continue; // no such symbol, so this prefix wasn't used, try the next prefix
477 }
478 method = k->lookup_method(trial_name, signature);
479 if (method == nullptr) {
480 continue; // signature doesn't match, try the next prefix
481 }
482 if (method->is_native()) {
483 method->set_is_prefixed_native();
484 return method; // wahoo, we found a prefixed version of the method, return it
485 }
486 // found as non-native, so prefix is good, add it, probably just need more prefixes
487 name_len = trial_len;
488 name_str = trial_name_str;
489 }
490 #endif // INCLUDE_JVMTI
491 return nullptr; // not found
492 }
493
494 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
495 Method* method = k->lookup_method(name, signature);
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("' name or signature does not match");
502 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
503 }
504 if (!method->is_native()) {
505 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
506 method = find_prefixed_native(k, name, signature, THREAD);
507 if (method == nullptr) {
508 ResourceMark rm(THREAD);
509 stringStream st;
510 st.print("Method '");
511 print_external_name(&st, k, name, signature);
512 st.print("' is not declared as native");
513 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
514 }
515 }
516
517 if (entry != nullptr) {
518 method->set_native_function(entry, native_bind_event_is_interesting);
519 } else {
520 method->clear_native_function();
521 }
522 if (log_is_enabled(Debug, jni, resolve)) {
523 ResourceMark rm(THREAD);
524 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
525 method->method_holder()->external_name(),
526 method->name()->as_C_string());
527 }
528 return true;
529 }
530
531 bool Method::was_executed_more_than(int n) {
532 // Invocation counter is reset when the Method* is compiled.
533 // If the method has compiled code we therefore assume it has
534 // be executed more than n times.
535 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
536 // interpreter doesn't bump invocation counter of trivial methods
537 // compiler does not bump invocation counter of compiled methods
538 return true;
539 }
540 else if ((method_counters() != nullptr &&
541 method_counters()->invocation_counter()->carry()) ||
542 (method_data() != nullptr &&
543 method_data()->invocation_counter()->carry())) {
544 // The carry bit is set when the counter overflows and causes
545 // a compilation to occur. We don't know how many times
546 // the counter has been reset, so we simply assume it has
547 // been executed more than n times.
548 return true;
549 } else {
550 return invocation_count() > n;
551 }
552 }
553
554 void Method::print_invocation_count(outputStream* st) {
555 //---< compose+print method return type, klass, name, and signature >---
556 if (is_static()) { st->print("static "); }
557 if (is_final()) { st->print("final "); }
558 if (is_synchronized()) { st->print("synchronized "); }
559 if (is_native()) { st->print("native "); }
560 st->print("%s::", method_holder()->external_name());
561 name()->print_symbol_on(st);
562 signature()->print_symbol_on(st);
563
564 if (WizardMode) {
565 // dump the size of the byte codes
566 st->print(" {%d}", code_size());
567 }
568 st->cr();
569
570 // Counting based on signed int counters tends to overflow with
571 // longer-running workloads on fast machines. The counters under
572 // consideration here, however, are limited in range by counting
573 // logic. See InvocationCounter:count_limit for example.
574 // No "overflow precautions" need to be implemented here.
575 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
576 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
577 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
578
579 if (method_data() != nullptr) {
580 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
581 }
582
583 #ifndef PRODUCT
584 if (CountCompiledCalls) {
585 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
586 }
587 #endif
588 }
589
590 // Build a MethodData* object to hold profiling information collected on this
591 // method when requested.
592 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
593 // Do not profile the method if metaspace has hit an OOM previously
594 // allocating profiling data. Callers clear pending exception so don't
595 // add one here.
596 if (ClassLoaderDataGraph::has_metaspace_oom()) {
597 return;
598 }
599
600 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
601 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
602 if (HAS_PENDING_EXCEPTION) {
603 CompileBroker::log_metaspace_failure();
604 ClassLoaderDataGraph::set_metaspace_oom(true);
605 return; // return the exception (which is cleared)
606 }
607
608 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
609 MetadataFactory::free_metadata(loader_data, method_data);
610 return;
611 }
612
613 if (PrintMethodData && (Verbose || WizardMode)) {
614 ResourceMark rm(THREAD);
615 tty->print("build_profiling_method_data for ");
616 method->print_name(tty);
617 tty->cr();
618 // At the end of the run, the MDO, full of data, will be dumped.
619 }
620 }
621
622 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
623 // Do not profile the method if metaspace has hit an OOM previously
624 if (ClassLoaderDataGraph::has_metaspace_oom()) {
625 return nullptr;
626 }
627
628 methodHandle mh(current, m);
629 MethodCounters* counters;
630 if (current->is_Java_thread()) {
631 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
632 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
633 // if needed.
634 counters = MethodCounters::allocate_with_exception(mh, THREAD);
635 if (HAS_PENDING_EXCEPTION) {
636 CLEAR_PENDING_EXCEPTION;
637 }
638 } else {
639 // Call metaspace allocation that doesn't throw exception if the
640 // current thread isn't a JavaThread, ie. the VMThread.
641 counters = MethodCounters::allocate_no_exception(mh);
642 }
643
644 if (counters == nullptr) {
645 CompileBroker::log_metaspace_failure();
646 ClassLoaderDataGraph::set_metaspace_oom(true);
647 return nullptr;
648 }
649
650 if (!mh->init_method_counters(counters)) {
651 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
652 }
653
654 return mh->method_counters();
655 }
656
657 bool Method::init_method_counters(MethodCounters* counters) {
658 // Try to install a pointer to MethodCounters, return true on success.
659 return Atomic::replace_if_null(&_method_counters, counters);
660 }
661
662 void Method::set_exception_handler_entered(int handler_bci) {
663 if (ProfileExceptionHandlers) {
664 MethodData* mdo = method_data();
665 if (mdo != nullptr) {
666 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
667 handler_data.set_exception_handler_entered();
668 }
669 }
670 }
671
672 int Method::extra_stack_words() {
673 // not an inline function, to avoid a header dependency on Interpreter
674 return extra_stack_entries() * Interpreter::stackElementSize;
675 }
676
677 // InlineKlass the method is declared to return. This must not
678 // safepoint as it is called with references live on the stack at
679 // locations the GC is unaware of.
680 InlineKlass* Method::returns_inline_type(Thread* thread) const {
681 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
682 if (is_native()) {
683 return nullptr;
684 }
685 NoSafepointVerifier nsv;
686 SignatureStream ss(signature());
687 while (!ss.at_return_type()) {
688 ss.next();
689 }
690 return ss.as_inline_klass(method_holder());
691 }
692
693 bool Method::is_vanilla_constructor() const {
694 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
695 // which only calls the superclass vanilla constructor and possibly does stores of
696 // zero constants to local fields:
697 //
698 // aload_0, _fast_aload_0, or _nofast_aload_0
699 // invokespecial
700 // indexbyte1
701 // indexbyte2
702 //
703 // followed by an (optional) sequence of:
704 //
705 // aload_0
706 // aconst_null / iconst_0 / fconst_0 / dconst_0
707 // putfield
708 // indexbyte1
709 // indexbyte2
710 //
711 // followed by:
712 //
713 // return
714
715 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
716 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
717 int size = code_size();
718 // Check if size match
719 if (size == 0 || size % 5 != 0) return false;
720 address cb = code_base();
721 int last = size - 1;
722 if ((cb[0] != Bytecodes::_aload_0 && cb[0] != Bytecodes::_fast_aload_0 && cb[0] != Bytecodes::_nofast_aload_0) ||
723 cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
724 // Does not call superclass default constructor
725 return false;
726 }
727 // Check optional sequence
728 for (int i = 4; i < last; i += 5) {
729 if (cb[i] != Bytecodes::_aload_0) return false;
730 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
731 if (cb[i+2] != Bytecodes::_putfield) return false;
732 }
733 return true;
734 }
735
736
737 bool Method::compute_has_loops_flag() {
738 BytecodeStream bcs(methodHandle(Thread::current(), this));
739 Bytecodes::Code bc;
740
741 while ((bc = bcs.next()) >= 0) {
742 switch (bc) {
743 case Bytecodes::_ifeq:
744 case Bytecodes::_ifnull:
745 case Bytecodes::_iflt:
746 case Bytecodes::_ifle:
747 case Bytecodes::_ifne:
748 case Bytecodes::_ifnonnull:
749 case Bytecodes::_ifgt:
750 case Bytecodes::_ifge:
751 case Bytecodes::_if_icmpeq:
752 case Bytecodes::_if_icmpne:
753 case Bytecodes::_if_icmplt:
754 case Bytecodes::_if_icmpgt:
755 case Bytecodes::_if_icmple:
756 case Bytecodes::_if_icmpge:
757 case Bytecodes::_if_acmpeq:
758 case Bytecodes::_if_acmpne:
759 case Bytecodes::_goto:
760 case Bytecodes::_jsr:
761 if (bcs.dest() < bcs.next_bci()) {
762 return set_has_loops();
763 }
764 break;
765
766 case Bytecodes::_goto_w:
767 case Bytecodes::_jsr_w:
768 if (bcs.dest_w() < bcs.next_bci()) {
769 return set_has_loops();
770 }
771 break;
772
773 case Bytecodes::_lookupswitch: {
774 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
775 if (lookupswitch.default_offset() < 0) {
776 return set_has_loops();
777 } else {
778 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
779 LookupswitchPair pair = lookupswitch.pair_at(i);
780 if (pair.offset() < 0) {
781 return set_has_loops();
782 }
783 }
784 }
785 break;
786 }
787 case Bytecodes::_tableswitch: {
788 Bytecode_tableswitch tableswitch(this, bcs.bcp());
789 if (tableswitch.default_offset() < 0) {
790 return set_has_loops();
791 } else {
792 for (int i = 0; i < tableswitch.length(); ++i) {
793 if (tableswitch.dest_offset_at(i) < 0) {
794 return set_has_loops();
795 }
796 }
797 }
798 break;
799 }
800 default:
801 break;
802 }
803 }
804
805 _flags.set_has_loops_flag_init(true);
806 return false;
807 }
808
809 bool Method::is_final_method(AccessFlags class_access_flags) const {
810 // or "does_not_require_vtable_entry"
811 // default method or overpass can occur, is not final (reuses vtable entry)
812 // private methods in classes get vtable entries for backward class compatibility.
813 if (is_overpass() || is_default_method()) return false;
814 return is_final() || class_access_flags.is_final();
815 }
816
817 bool Method::is_final_method() const {
818 return is_final_method(method_holder()->access_flags());
819 }
820
821 bool Method::is_default_method() const {
822 if (method_holder() != nullptr &&
823 method_holder()->is_interface() &&
824 !is_abstract() && !is_private()) {
825 return true;
826 } else {
827 return false;
828 }
829 }
830
831 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
832 if (is_final_method(class_access_flags)) return true;
833 #ifdef ASSERT
834 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
835 if (class_access_flags.is_interface()) {
836 ResourceMark rm;
837 assert(is_nonv == is_static() || is_nonv == is_private(),
838 "nonvirtual unexpected for non-static, non-private: %s",
839 name_and_sig_as_C_string());
840 }
841 #endif
842 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
843 return vtable_index() == nonvirtual_vtable_index;
844 }
845
846 bool Method::can_be_statically_bound() const {
847 return can_be_statically_bound(method_holder()->access_flags());
848 }
849
850 bool Method::can_be_statically_bound(InstanceKlass* context) const {
851 return (method_holder() == context) && can_be_statically_bound();
852 }
853
854 /**
855 * Returns false if this is one of specially treated methods for
856 * which we have to provide stack trace in throw in compiled code.
857 * Returns true otherwise.
858 */
859 bool Method::can_omit_stack_trace() {
860 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
861 return false; // All methods in sun.invoke.util.ValueConversions
862 }
863 return true;
864 }
865
866 bool Method::is_accessor() const {
867 return is_getter() || is_setter();
868 }
869
870 bool Method::is_getter() const {
871 if (code_size() != 5) return false;
872 if (size_of_parameters() != 1) return false;
873 if (java_code_at(0) != Bytecodes::_aload_0) return false;
874 if (java_code_at(1) != Bytecodes::_getfield) return false;
875 switch (java_code_at(4)) {
876 case Bytecodes::_ireturn:
877 case Bytecodes::_lreturn:
878 case Bytecodes::_freturn:
879 case Bytecodes::_dreturn:
880 case Bytecodes::_areturn:
881 break;
882 default:
883 return false;
884 }
885 if (has_scalarized_return()) {
886 // Don't treat this as (trivial) getter method because the
887 // inline type should be returned in a scalarized form.
888 return false;
889 }
890 return true;
891 }
892
893 bool Method::is_setter() const {
894 if (code_size() != 6) return false;
895 if (java_code_at(0) != Bytecodes::_aload_0) return false;
896 switch (java_code_at(1)) {
897 case Bytecodes::_iload_1:
898 case Bytecodes::_aload_1:
899 case Bytecodes::_fload_1:
900 if (size_of_parameters() != 2) return false;
901 break;
902 case Bytecodes::_dload_1:
903 case Bytecodes::_lload_1:
904 if (size_of_parameters() != 3) return false;
905 break;
906 default:
907 return false;
908 }
909 if (java_code_at(2) != Bytecodes::_putfield) return false;
910 if (java_code_at(5) != Bytecodes::_return) return false;
911 if (has_scalarized_args()) {
912 // Don't treat this as (trivial) setter method because the
913 // inline type argument should be passed in a scalarized form.
914 return false;
915 }
916 return true;
917 }
918
919 bool Method::is_constant_getter() const {
920 int last_index = code_size() - 1;
921 // Check if the first 1-3 bytecodes are a constant push
922 // and the last bytecode is a return.
923 return (2 <= code_size() && code_size() <= 4 &&
924 Bytecodes::is_const(java_code_at(0)) &&
925 Bytecodes::length_for(java_code_at(0)) == last_index &&
926 Bytecodes::is_return(java_code_at(last_index)) &&
927 !has_scalarized_args());
928 }
929
930 bool Method::is_class_initializer() const {
931 // For classfiles version 51 or greater, ensure that the clinit method is
932 // static. Non-static methods with the name "<clinit>" are not static
933 // initializers. (older classfiles exempted for backward compatibility)
934 return (name() == vmSymbols::class_initializer_name() &&
935 (is_static() ||
936 method_holder()->major_version() < 51));
937 }
938
939 // A method named <init>, is a classic object constructor.
940 bool Method::is_object_constructor() const {
941 return name() == vmSymbols::object_initializer_name();
942 }
943
944 bool Method::needs_clinit_barrier() const {
945 return is_static() && !method_holder()->is_initialized();
946 }
947
948 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
949 int length = method->checked_exceptions_length();
950 if (length == 0) { // common case
951 return objArrayHandle(THREAD, Universe::the_empty_class_array());
952 } else {
953 methodHandle h_this(THREAD, method);
954 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
955 objArrayHandle mirrors (THREAD, m_oop);
956 for (int i = 0; i < length; i++) {
957 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
958 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
959 if (log_is_enabled(Warning, exceptions) &&
960 !k->is_subclass_of(vmClasses::Throwable_klass())) {
961 ResourceMark rm(THREAD);
962 log_warning(exceptions)(
963 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
964 k->external_name(), method->external_name());
965 }
966 mirrors->obj_at_put(i, k->java_mirror());
967 }
968 return mirrors;
969 }
970 };
971
972
973 int Method::line_number_from_bci(int bci) const {
974 int best_bci = 0;
975 int best_line = -1;
976 if (bci == SynchronizationEntryBCI) bci = 0;
977 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
978 // The line numbers are a short array of 2-tuples [start_pc, line_number].
979 // Not necessarily sorted and not necessarily one-to-one.
980 CompressedLineNumberReadStream stream(compressed_linenumber_table());
981 while (stream.read_pair()) {
982 if (stream.bci() == bci) {
983 // perfect match
984 return stream.line();
985 } else {
986 // update best_bci/line
987 if (stream.bci() < bci && stream.bci() >= best_bci) {
988 best_bci = stream.bci();
989 best_line = stream.line();
990 }
991 }
992 }
993 }
994 return best_line;
995 }
996
997
998 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
999 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
1000 Thread *thread = Thread::current();
1001 Symbol* klass_name = constants()->klass_name_at(klass_index);
1002 Handle loader(thread, method_holder()->class_loader());
1003 Handle prot (thread, method_holder()->protection_domain());
1004 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != nullptr;
1005 } else {
1006 return true;
1007 }
1008 }
1009
1010
1011 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1012 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1013 if (must_be_resolved) {
1014 // Make sure klass is resolved in constantpool.
1015 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
1016 return false;
1017 }
1018 }
1019 return is_klass_loaded_by_klass_index(klass_index);
1020 }
1021
1022
1023 void Method::set_native_function(address function, bool post_event_flag) {
1024 assert(function != nullptr, "use clear_native_function to unregister natives");
1025 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1026 address* native_function = native_function_addr();
1027
1028 // We can see racers trying to place the same native function into place. Once
1029 // is plenty.
1030 address current = *native_function;
1031 if (current == function) return;
1032 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1033 function != nullptr) {
1034 // native_method_throw_unsatisfied_link_error_entry() should only
1035 // be passed when post_event_flag is false.
1036 assert(function !=
1037 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1038 "post_event_flag mismatch");
1039
1040 // post the bind event, and possible change the bind function
1041 JvmtiExport::post_native_method_bind(this, &function);
1042 }
1043 *native_function = function;
1044 // This function can be called more than once. We must make sure that we always
1045 // use the latest registered method -> check if a stub already has been generated.
1046 // If so, we have to make it not_entrant.
1047 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
1048 if (nm != nullptr) {
1049 nm->make_not_entrant();
1050 }
1051 }
1052
1053
1054 bool Method::has_native_function() const {
1055 if (is_special_native_intrinsic())
1056 return false; // special-cased in SharedRuntime::generate_native_wrapper
1057 address func = native_function();
1058 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1059 }
1060
1061
1062 void Method::clear_native_function() {
1063 // Note: is_method_handle_intrinsic() is allowed here.
1064 set_native_function(
1065 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1066 !native_bind_event_is_interesting);
1067 this->unlink_code();
1068 }
1069
1070
1071 void Method::set_signature_handler(address handler) {
1072 address* signature_handler = signature_handler_addr();
1073 *signature_handler = handler;
1074 }
1075
1076
1077 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1078 assert(reason != nullptr, "must provide a reason");
1079 if (PrintCompilation && report) {
1080 ttyLocker ttyl;
1081 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1082 if (comp_level == CompLevel_all) {
1083 tty->print("all levels ");
1084 } else {
1085 tty->print("level %d ", comp_level);
1086 }
1087 this->print_short_name(tty);
1088 int size = this->code_size();
1089 if (size > 0) {
1090 tty->print(" (%d bytes)", size);
1091 }
1092 if (reason != nullptr) {
1093 tty->print(" %s", reason);
1094 }
1095 tty->cr();
1096 }
1097 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1098 ttyLocker ttyl;
1099 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
1100 os::current_thread_id(), is_osr, comp_level);
1101 if (reason != nullptr) {
1102 xtty->print(" reason=\'%s\'", reason);
1103 }
1104 xtty->method(this);
1105 xtty->stamp();
1106 xtty->end_elem();
1107 }
1108 }
1109
1110 bool Method::is_always_compilable() const {
1111 // Generated adapters must be compiled
1112 if (is_special_native_intrinsic() && is_synthetic()) {
1113 assert(!is_not_c1_compilable(), "sanity check");
1114 assert(!is_not_c2_compilable(), "sanity check");
1115 return true;
1116 }
1117
1118 return false;
1119 }
1120
1121 bool Method::is_not_compilable(int comp_level) const {
1122 if (number_of_breakpoints() > 0)
1123 return true;
1124 if (is_always_compilable())
1125 return false;
1126 if (comp_level == CompLevel_any)
1127 return is_not_c1_compilable() && is_not_c2_compilable();
1128 if (is_c1_compile(comp_level))
1129 return is_not_c1_compilable();
1130 if (is_c2_compile(comp_level))
1131 return is_not_c2_compilable();
1132 return false;
1133 }
1134
1135 // call this when compiler finds that this method is not compilable
1136 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1137 if (is_always_compilable()) {
1138 // Don't mark a method which should be always compilable
1139 return;
1140 }
1141 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1142 if (comp_level == CompLevel_all) {
1143 set_is_not_c1_compilable();
1144 set_is_not_c2_compilable();
1145 } else {
1146 if (is_c1_compile(comp_level))
1147 set_is_not_c1_compilable();
1148 if (is_c2_compile(comp_level))
1149 set_is_not_c2_compilable();
1150 }
1151 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1152 }
1153
1154 bool Method::is_not_osr_compilable(int comp_level) const {
1155 if (is_not_compilable(comp_level))
1156 return true;
1157 if (comp_level == CompLevel_any)
1158 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1159 if (is_c1_compile(comp_level))
1160 return is_not_c1_osr_compilable();
1161 if (is_c2_compile(comp_level))
1162 return is_not_c2_osr_compilable();
1163 return false;
1164 }
1165
1166 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1167 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1168 if (comp_level == CompLevel_all) {
1169 set_is_not_c1_osr_compilable();
1170 set_is_not_c2_osr_compilable();
1171 } else {
1172 if (is_c1_compile(comp_level))
1173 set_is_not_c1_osr_compilable();
1174 if (is_c2_compile(comp_level))
1175 set_is_not_c2_osr_compilable();
1176 }
1177 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1178 }
1179
1180 // Revert to using the interpreter and clear out the nmethod
1181 void Method::clear_code() {
1182 // this may be null if c2i adapters have not been made yet
1183 // Only should happen at allocate time.
1184 if (adapter() == nullptr) {
1185 _from_compiled_entry = nullptr;
1186 _from_compiled_inline_entry = nullptr;
1187 _from_compiled_inline_ro_entry = nullptr;
1188 } else {
1189 _from_compiled_entry = adapter()->get_c2i_entry();
1190 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1191 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1192 }
1193 OrderAccess::storestore();
1194 _from_interpreted_entry = _i2i_entry;
1195 OrderAccess::storestore();
1196 _code = nullptr;
1197 }
1198
1199 void Method::unlink_code(CompiledMethod *compare) {
1200 ConditionalMutexLocker ml(CompiledMethod_lock, !CompiledMethod_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1201 // We need to check if either the _code or _from_compiled_code_entry_point
1202 // refer to this nmethod because there is a race in setting these two fields
1203 // in Method* as seen in bugid 4947125.
1204 if (code() == compare ||
1205 from_compiled_entry() == compare->verified_entry_point()) {
1206 clear_code();
1207 }
1208 }
1209
1210 void Method::unlink_code() {
1211 ConditionalMutexLocker ml(CompiledMethod_lock, !CompiledMethod_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1212 clear_code();
1213 }
1214
1215 #if INCLUDE_CDS
1216 // Called by class data sharing to remove any entry points (which are not shared)
1217 void Method::unlink_method() {
1218 assert(CDSConfig::is_dumping_archive(), "sanity");
1219 _code = nullptr;
1220 _adapter = nullptr;
1221 _i2i_entry = nullptr;
1222 _from_compiled_entry = nullptr;
1223 _from_compiled_inline_entry = nullptr;
1224 _from_compiled_inline_ro_entry = nullptr;
1225 _from_interpreted_entry = nullptr;
1226
1227 if (is_native()) {
1228 *native_function_addr() = nullptr;
1229 set_signature_handler(nullptr);
1230 }
1231 NOT_PRODUCT(set_compiled_invocation_count(0);)
1232
1233 clear_method_data();
1234 clear_method_counters();
1235 remove_unshareable_flags();
1236 }
1237
1238 void Method::remove_unshareable_flags() {
1239 // clear all the flags that shouldn't be in the archived version
1240 assert(!is_old(), "must be");
1241 assert(!is_obsolete(), "must be");
1242 assert(!is_deleted(), "must be");
1243
1244 set_is_prefixed_native(false);
1245 set_queued_for_compilation(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_scalarized_args(false);
1251 set_has_scalarized_return(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 the code cache is full, we may reenter this function for the
1259 // leftover methods that weren't linked.
1260 if (adapter() != nullptr) {
1261 return;
1262 }
1263 assert( _code == nullptr, "nothing compiled yet" );
1264
1265 // Setup interpreter entrypoint
1266 assert(this == h_method(), "wrong h_method()" );
1267
1268 assert(adapter() == nullptr, "init'd to null");
1269 address entry = Interpreter::entry_for_method(h_method);
1270 assert(entry != nullptr, "interpreter entry must be non-null");
1271 // Sets both _i2i_entry and _from_interpreted_entry
1272 set_interpreter_entry(entry);
1273
1274 // Don't overwrite already registered native entries.
1275 if (is_native() && !has_native_function()) {
1276 set_native_function(
1277 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1278 !native_bind_event_is_interesting);
1279 }
1280 if (InlineTypeReturnedAsFields && returns_inline_type(THREAD) && !has_scalarized_return()) {
1281 set_has_scalarized_return();
1282 }
1283
1284 // Setup compiler entrypoint. This is made eagerly, so we do not need
1285 // special handling of vtables. An alternative is to make adapters more
1286 // lazily by calling make_adapter() from from_compiled_entry() for the
1287 // normal calls. For vtable calls life gets more complicated. When a
1288 // call-site goes mega-morphic we need adapters in all methods which can be
1289 // called from the vtable. We need adapters on such methods that get loaded
1290 // later. Ditto for mega-morphic itable calls. If this proves to be a
1291 // problem we'll make these lazily later.
1292 (void) make_adapters(h_method, CHECK);
1293
1294 // ONLY USE the h_method now as make_adapter may have blocked
1295
1296 if (h_method->is_continuation_native_intrinsic()) {
1297 _from_interpreted_entry = nullptr;
1298 _from_compiled_entry = nullptr;
1299 _i2i_entry = nullptr;
1300 if (Continuations::enabled()) {
1301 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1302 AdapterHandlerLibrary::create_native_wrapper(h_method);
1303 if (!h_method->has_compiled_code()) {
1304 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1305 }
1306 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1307 }
1308 }
1309 }
1310
1311 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1312 // Adapters for compiled code are made eagerly here. They are fairly
1313 // small (generally < 100 bytes) and quick to make (and cached and shared)
1314 // so making them eagerly shouldn't be too expensive.
1315 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1316 if (adapter == nullptr ) {
1317 if (!is_init_completed()) {
1318 // Don't throw exceptions during VM initialization because java.lang.* classes
1319 // might not have been initialized, causing problems when constructing the
1320 // Java exception object.
1321 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1322 } else {
1323 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1324 }
1325 }
1326
1327 mh->set_adapter_entry(adapter);
1328 mh->_from_compiled_entry = adapter->get_c2i_entry();
1329 mh->_from_compiled_inline_entry = adapter->get_c2i_inline_entry();
1330 mh->_from_compiled_inline_ro_entry = adapter->get_c2i_inline_ro_entry();
1331 return adapter->get_c2i_entry();
1332 }
1333
1334 // The verified_code_entry() must be called when a invoke is resolved
1335 // on this method.
1336
1337 // It returns the compiled code entry point, after asserting not null.
1338 // This function is called after potential safepoints so that nmethod
1339 // or adapter that it points to is still live and valid.
1340 // This function must not hit a safepoint!
1341 address Method::verified_code_entry() {
1342 debug_only(NoSafepointVerifier nsv;)
1343 assert(_from_compiled_entry != nullptr, "must be set");
1344 return _from_compiled_entry;
1345 }
1346
1347 address Method::verified_inline_code_entry() {
1348 debug_only(NoSafepointVerifier nsv;)
1349 assert(_from_compiled_inline_entry != nullptr, "must be set");
1350 return _from_compiled_inline_entry;
1351 }
1352
1353 address Method::verified_inline_ro_code_entry() {
1354 debug_only(NoSafepointVerifier nsv;)
1355 assert(_from_compiled_inline_ro_entry != nullptr, "must be set");
1356 return _from_compiled_inline_ro_entry;
1357 }
1358
1359 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1360 // (could be racing a deopt).
1361 // Not inline to avoid circular ref.
1362 bool Method::check_code() const {
1363 // cached in a register or local. There's a race on the value of the field.
1364 CompiledMethod *code = Atomic::load_acquire(&_code);
1365 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1366 }
1367
1368 // Install compiled code. Instantly it can execute.
1369 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1370 assert_lock_strong(CompiledMethod_lock);
1371 assert( code, "use clear_code to remove code" );
1372 assert( mh->check_code(), "" );
1373
1374 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1375
1376 // These writes must happen in this order, because the interpreter will
1377 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1378 // which jumps to _from_compiled_entry.
1379 mh->_code = code; // Assign before allowing compiled code to exec
1380
1381 int comp_level = code->comp_level();
1382 // In theory there could be a race here. In practice it is unlikely
1383 // and not worth worrying about.
1384 if (comp_level > mh->highest_comp_level()) {
1385 mh->set_highest_comp_level(comp_level);
1386 }
1387
1388 OrderAccess::storestore();
1389 mh->_from_compiled_entry = code->verified_entry_point();
1390 mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1391 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1392 OrderAccess::storestore();
1393
1394 if (mh->is_continuation_native_intrinsic()) {
1395 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1396
1397 if (mh->is_continuation_enter_intrinsic()) {
1398 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1399 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1400 } else if (mh->is_continuation_yield_intrinsic()) {
1401 mh->_i2i_entry = mh->get_i2c_entry();
1402 } else {
1403 guarantee(false, "Unknown Continuation native intrinsic");
1404 }
1405 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1406 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1407 } else if (!mh->is_method_handle_intrinsic()) {
1408 // Instantly compiled code can execute.
1409 mh->_from_interpreted_entry = mh->get_i2c_entry();
1410 }
1411 }
1412
1413
1414 bool Method::is_overridden_in(Klass* k) const {
1415 InstanceKlass* ik = InstanceKlass::cast(k);
1416
1417 if (ik->is_interface()) return false;
1418
1419 // If method is an interface, we skip it - except if it
1420 // is a miranda method
1421 if (method_holder()->is_interface()) {
1422 // Check that method is not a miranda method
1423 if (ik->lookup_method(name(), signature()) == nullptr) {
1424 // No implementation exist - so miranda method
1425 return false;
1426 }
1427 return true;
1428 }
1429
1430 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1431 if (!has_vtable_index()) {
1432 return false;
1433 } else {
1434 Method* vt_m = ik->method_at_vtable(vtable_index());
1435 return vt_m != this;
1436 }
1437 }
1438
1439
1440 // give advice about whether this Method* should be cached or not
1441 bool Method::should_not_be_cached() const {
1442 if (is_old()) {
1443 // This method has been redefined. It is either EMCP or obsolete
1444 // and we don't want to cache it because that would pin the method
1445 // down and prevent it from being collectible if and when it
1446 // finishes executing.
1447 return true;
1448 }
1449
1450 // caching this method should be just fine
1451 return false;
1452 }
1453
1454
1455 /**
1456 * Returns true if this is one of the specially treated methods for
1457 * security related stack walks (like Reflection.getCallerClass).
1458 */
1459 bool Method::is_ignored_by_security_stack_walk() const {
1460 if (intrinsic_id() == vmIntrinsics::_invoke) {
1461 // This is Method.invoke() -- ignore it
1462 return true;
1463 }
1464 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1465 // This is an auxiliary frame -- ignore it
1466 return true;
1467 }
1468 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1469 // This is an internal adapter frame for method handles -- ignore it
1470 return true;
1471 }
1472 return false;
1473 }
1474
1475
1476 // Constant pool structure for invoke methods:
1477 enum {
1478 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1479 _imcp_invoke_signature, // utf8: (variable Symbol*)
1480 _imcp_limit
1481 };
1482
1483 // Test if this method is an MH adapter frame generated by Java code.
1484 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1485 bool Method::is_compiled_lambda_form() const {
1486 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1487 }
1488
1489 // Test if this method is an internal MH primitive method.
1490 bool Method::is_method_handle_intrinsic() const {
1491 vmIntrinsics::ID iid = intrinsic_id();
1492 return (MethodHandles::is_signature_polymorphic(iid) &&
1493 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1494 }
1495
1496 bool Method::has_member_arg() const {
1497 vmIntrinsics::ID iid = intrinsic_id();
1498 return (MethodHandles::is_signature_polymorphic(iid) &&
1499 MethodHandles::has_member_arg(iid));
1500 }
1501
1502 // Make an instance of a signature-polymorphic internal MH primitive.
1503 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1504 Symbol* signature,
1505 TRAPS) {
1506 ResourceMark rm(THREAD);
1507 methodHandle empty;
1508
1509 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1510 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1511 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1512
1513 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1514
1515 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1516 name->increment_refcount();
1517 signature->increment_refcount();
1518
1519 int cp_length = _imcp_limit;
1520 ClassLoaderData* loader_data = holder->class_loader_data();
1521 constantPoolHandle cp;
1522 {
1523 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1524 cp = constantPoolHandle(THREAD, cp_oop);
1525 }
1526 cp->copy_fields(holder->constants());
1527 cp->set_pool_holder(holder);
1528 cp->symbol_at_put(_imcp_invoke_name, name);
1529 cp->symbol_at_put(_imcp_invoke_signature, signature);
1530 cp->set_has_preresolution();
1531
1532 // decide on access bits: public or not?
1533 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1534 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1535 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1536 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1537
1538 methodHandle m;
1539 {
1540 InlineTableSizes sizes;
1541 Method* m_oop = Method::allocate(loader_data, 0,
1542 accessFlags_from(flags_bits), &sizes,
1543 ConstMethod::NORMAL,
1544 name,
1545 CHECK_(empty));
1546 m = methodHandle(THREAD, m_oop);
1547 }
1548 m->set_constants(cp());
1549 m->set_name_index(_imcp_invoke_name);
1550 m->set_signature_index(_imcp_invoke_signature);
1551 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1552 assert(m->signature() == signature, "");
1553 m->constMethod()->compute_from_signature(signature, must_be_static);
1554 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1555 assert(m->is_method_handle_intrinsic(), "");
1556 #ifdef ASSERT
1557 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1558 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1559 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1560 #endif //ASSERT
1561
1562 // Finally, set up its entry points.
1563 assert(m->can_be_statically_bound(), "");
1564 m->set_vtable_index(Method::nonvirtual_vtable_index);
1565 m->link_method(m, CHECK_(empty));
1566
1567 if (iid == vmIntrinsics::_linkToNative) {
1568 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1569 }
1570 if (log_is_enabled(Debug, methodhandles)) {
1571 LogTarget(Debug, methodhandles) lt;
1572 LogStream ls(lt);
1573 m->print_on(&ls);
1574 }
1575
1576 return m;
1577 }
1578
1579 Klass* Method::check_non_bcp_klass(Klass* klass) {
1580 if (klass != nullptr && klass->class_loader() != nullptr) {
1581 if (klass->is_objArray_klass())
1582 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1583 return klass;
1584 }
1585 return nullptr;
1586 }
1587
1588
1589 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1590 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1591 // Code below does not work for native methods - they should never get rewritten anyway
1592 assert(!m->is_native(), "cannot rewrite native methods");
1593 // Allocate new Method*
1594 AccessFlags flags = m->access_flags();
1595
1596 ConstMethod* cm = m->constMethod();
1597 int checked_exceptions_len = cm->checked_exceptions_length();
1598 int localvariable_len = cm->localvariable_table_length();
1599 int exception_table_len = cm->exception_table_length();
1600 int method_parameters_len = cm->method_parameters_length();
1601 int method_annotations_len = cm->method_annotations_length();
1602 int parameter_annotations_len = cm->parameter_annotations_length();
1603 int type_annotations_len = cm->type_annotations_length();
1604 int default_annotations_len = cm->default_annotations_length();
1605
1606 InlineTableSizes sizes(
1607 localvariable_len,
1608 new_compressed_linenumber_size,
1609 exception_table_len,
1610 checked_exceptions_len,
1611 method_parameters_len,
1612 cm->generic_signature_index(),
1613 method_annotations_len,
1614 parameter_annotations_len,
1615 type_annotations_len,
1616 default_annotations_len,
1617 0);
1618
1619 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1620 Method* newm_oop = Method::allocate(loader_data,
1621 new_code_length,
1622 flags,
1623 &sizes,
1624 m->method_type(),
1625 m->name(),
1626 CHECK_(methodHandle()));
1627 methodHandle newm (THREAD, newm_oop);
1628
1629 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1630 ConstMethod* newcm = newm->constMethod();
1631 int new_const_method_size = newm->constMethod()->size();
1632
1633 // This works because the source and target are both Methods. Some compilers
1634 // (e.g., clang) complain that the target vtable pointer will be stomped,
1635 // so cast away newm()'s and m()'s Methodness.
1636 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1637
1638 // Create shallow copy of ConstMethod.
1639 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1640
1641 // Reset correct method/const method, method size, and parameter info
1642 newm->set_constMethod(newcm);
1643 newm->constMethod()->set_code_size(new_code_length);
1644 newm->constMethod()->set_constMethod_size(new_const_method_size);
1645 assert(newm->code_size() == new_code_length, "check");
1646 assert(newm->method_parameters_length() == method_parameters_len, "check");
1647 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1648 assert(newm->exception_table_length() == exception_table_len, "check");
1649 assert(newm->localvariable_table_length() == localvariable_len, "check");
1650 // Copy new byte codes
1651 memcpy(newm->code_base(), new_code, new_code_length);
1652 // Copy line number table
1653 if (new_compressed_linenumber_size > 0) {
1654 memcpy(newm->compressed_linenumber_table(),
1655 new_compressed_linenumber_table,
1656 new_compressed_linenumber_size);
1657 }
1658 // Copy method_parameters
1659 if (method_parameters_len > 0) {
1660 memcpy(newm->method_parameters_start(),
1661 m->method_parameters_start(),
1662 method_parameters_len * sizeof(MethodParametersElement));
1663 }
1664 // Copy checked_exceptions
1665 if (checked_exceptions_len > 0) {
1666 memcpy(newm->checked_exceptions_start(),
1667 m->checked_exceptions_start(),
1668 checked_exceptions_len * sizeof(CheckedExceptionElement));
1669 }
1670 // Copy exception table
1671 if (exception_table_len > 0) {
1672 memcpy(newm->exception_table_start(),
1673 m->exception_table_start(),
1674 exception_table_len * sizeof(ExceptionTableElement));
1675 }
1676 // Copy local variable number table
1677 if (localvariable_len > 0) {
1678 memcpy(newm->localvariable_table_start(),
1679 m->localvariable_table_start(),
1680 localvariable_len * sizeof(LocalVariableTableElement));
1681 }
1682 // Copy stackmap table
1683 if (m->has_stackmap_table()) {
1684 int code_attribute_length = m->stackmap_data()->length();
1685 Array<u1>* stackmap_data =
1686 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1687 memcpy((void*)stackmap_data->adr_at(0),
1688 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1689 newm->set_stackmap_data(stackmap_data);
1690 }
1691
1692 // copy annotations over to new method
1693 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1694 return newm;
1695 }
1696
1697 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1698 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1699 // because we are not loading from core libraries
1700 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1701 // which does not use the class default class loader so we check for its loader here
1702 const InstanceKlass* ik = InstanceKlass::cast(holder);
1703 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1704 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1705 }
1706
1707 // see if the klass name is well-known:
1708 Symbol* klass_name = ik->name();
1709 vmSymbolID id = vmSymbols::find_sid(klass_name);
1710 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1711 return id;
1712 } else {
1713 return vmSymbolID::NO_SID;
1714 }
1715 }
1716
1717 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1718 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1719 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1720 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1721 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1722
1723 // the klass name is well-known:
1724 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1725 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1726
1727 // ditto for method and signature:
1728 vmSymbolID name_id = vmSymbols::find_sid(name());
1729 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1730 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1731 && name_id == vmSymbolID::NO_SID) {
1732 return;
1733 }
1734 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1735 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1736 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1737 && sig_id == vmSymbolID::NO_SID) {
1738 return;
1739 }
1740 jshort flags = access_flags().as_short();
1741
1742 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1743 if (id != vmIntrinsics::_none) {
1744 set_intrinsic_id(id);
1745 if (id == vmIntrinsics::_Class_cast) {
1746 // Even if the intrinsic is rejected, we want to inline this simple method.
1747 set_force_inline();
1748 }
1749 return;
1750 }
1751
1752 // A few slightly irregular cases:
1753 switch (klass_id) {
1754 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1755 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1756 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1757 if (!is_native()) break;
1758 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1759 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1760 id = vmIntrinsics::_none;
1761 break;
1762
1763 default:
1764 break;
1765 }
1766
1767 if (id != vmIntrinsics::_none) {
1768 // Set up its iid. It is an alias method.
1769 set_intrinsic_id(id);
1770 return;
1771 }
1772 }
1773
1774 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1775 if (!THREAD->can_call_java()) {
1776 // There is nothing useful this routine can do from within the Compile thread.
1777 // Hopefully, the signature contains only well-known classes.
1778 // We could scan for this and return true/false, but the caller won't care.
1779 return false;
1780 }
1781 bool sig_is_loaded = true;
1782 ResourceMark rm(THREAD);
1783 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1784 if (ss.is_reference()) {
1785 // load everything, including arrays "[Lfoo;"
1786 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1787 // We are loading classes eagerly. If a ClassNotFoundException or
1788 // a LinkageError was generated, be sure to ignore it.
1789 if (HAS_PENDING_EXCEPTION) {
1790 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1791 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1792 CLEAR_PENDING_EXCEPTION;
1793 } else {
1794 return false;
1795 }
1796 }
1797 if( klass == nullptr) { sig_is_loaded = false; }
1798 }
1799 }
1800 return sig_is_loaded;
1801 }
1802
1803 // Exposed so field engineers can debug VM
1804 void Method::print_short_name(outputStream* st) const {
1805 ResourceMark rm;
1806 #ifdef PRODUCT
1807 st->print(" %s::", method_holder()->external_name());
1808 #else
1809 st->print(" %s::", method_holder()->internal_name());
1810 #endif
1811 name()->print_symbol_on(st);
1812 if (WizardMode) signature()->print_symbol_on(st);
1813 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1814 MethodHandles::print_as_basic_type_signature_on(st, signature());
1815 }
1816
1817 // Comparer for sorting an object array containing
1818 // Method*s.
1819 static int method_comparator(Method* a, Method* b) {
1820 return a->name()->fast_compare(b->name());
1821 }
1822
1823 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1824 // default_methods also uses this without the ordering for fast find_method
1825 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1826 int length = methods->length();
1827 if (length > 1) {
1828 if (func == nullptr) {
1829 func = method_comparator;
1830 }
1831 {
1832 NoSafepointVerifier nsv;
1833 QuickSort::sort(methods->data(), length, func, /*idempotent=*/false);
1834 }
1835 // Reset method ordering
1836 if (set_idnums) {
1837 for (u2 i = 0; i < length; i++) {
1838 Method* m = methods->at(i);
1839 m->set_method_idnum(i);
1840 m->set_orig_method_idnum(i);
1841 }
1842 }
1843 }
1844 }
1845
1846 //-----------------------------------------------------------------------------------
1847 // Non-product code unless JVM/TI needs it
1848
1849 #if !defined(PRODUCT) || INCLUDE_JVMTI
1850 class SignatureTypePrinter : public SignatureTypeNames {
1851 private:
1852 outputStream* _st;
1853 bool _use_separator;
1854
1855 void type_name(const char* name) {
1856 if (_use_separator) _st->print(", ");
1857 _st->print("%s", name);
1858 _use_separator = true;
1859 }
1860
1861 public:
1862 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1863 _st = st;
1864 _use_separator = false;
1865 }
1866
1867 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1868 void print_returntype() { _use_separator = false; do_type(return_type()); }
1869 };
1870
1871
1872 void Method::print_name(outputStream* st) const {
1873 Thread *thread = Thread::current();
1874 ResourceMark rm(thread);
1875 st->print("%s ", is_static() ? "static" : "virtual");
1876 if (WizardMode) {
1877 st->print("%s.", method_holder()->internal_name());
1878 name()->print_symbol_on(st);
1879 signature()->print_symbol_on(st);
1880 } else {
1881 SignatureTypePrinter sig(signature(), st);
1882 sig.print_returntype();
1883 st->print(" %s.", method_holder()->internal_name());
1884 name()->print_symbol_on(st);
1885 st->print("(");
1886 sig.print_parameters();
1887 st->print(")");
1888 }
1889 }
1890 #endif // !PRODUCT || INCLUDE_JVMTI
1891
1892
1893 void Method::print_codes_on(outputStream* st, int flags) const {
1894 print_codes_on(0, code_size(), st, flags);
1895 }
1896
1897 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1898 Thread *thread = Thread::current();
1899 ResourceMark rm(thread);
1900 methodHandle mh (thread, (Method*)this);
1901 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1902 }
1903
1904 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1905 _bci = 0;
1906 _line = 0;
1907 };
1908
1909 bool CompressedLineNumberReadStream::read_pair() {
1910 jubyte next = read_byte();
1911 // Check for terminator
1912 if (next == 0) return false;
1913 if (next == 0xFF) {
1914 // Escape character, regular compression used
1915 _bci += read_signed_int();
1916 _line += read_signed_int();
1917 } else {
1918 // Single byte compression used
1919 _bci += next >> 3;
1920 _line += next & 0x7;
1921 }
1922 return true;
1923 }
1924
1925 #if INCLUDE_JVMTI
1926
1927 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1928 BreakpointInfo* bp = method_holder()->breakpoints();
1929 for (; bp != nullptr; bp = bp->next()) {
1930 if (bp->match(this, bci)) {
1931 return bp->orig_bytecode();
1932 }
1933 }
1934 {
1935 ResourceMark rm;
1936 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1937 }
1938 return Bytecodes::_shouldnotreachhere;
1939 }
1940
1941 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1942 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1943 BreakpointInfo* bp = method_holder()->breakpoints();
1944 for (; bp != nullptr; bp = bp->next()) {
1945 if (bp->match(this, bci)) {
1946 bp->set_orig_bytecode(code);
1947 // and continue, in case there is more than one
1948 }
1949 }
1950 }
1951
1952 void Method::set_breakpoint(int bci) {
1953 InstanceKlass* ik = method_holder();
1954 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1955 bp->set_next(ik->breakpoints());
1956 ik->set_breakpoints(bp);
1957 // do this last:
1958 bp->set(this);
1959 }
1960
1961 static void clear_matches(Method* m, int bci) {
1962 InstanceKlass* ik = m->method_holder();
1963 BreakpointInfo* prev_bp = nullptr;
1964 BreakpointInfo* next_bp;
1965 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1966 next_bp = bp->next();
1967 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1968 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1969 // do this first:
1970 bp->clear(m);
1971 // unhook it
1972 if (prev_bp != nullptr)
1973 prev_bp->set_next(next_bp);
1974 else
1975 ik->set_breakpoints(next_bp);
1976 delete bp;
1977 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1978 // at same location. So we have multiple matching (method_index and bci)
1979 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1980 // breakpoint for clear_breakpoint request and keep all other method versions
1981 // BreakpointInfo for future clear_breakpoint request.
1982 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1983 // which is being called when class is unloaded. We delete all the Breakpoint
1984 // information for all versions of method. We may not correctly restore the original
1985 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1986 // so these methods won't be used anymore.
1987 if (bci >= 0) {
1988 break;
1989 }
1990 } else {
1991 // This one is a keeper.
1992 prev_bp = bp;
1993 }
1994 }
1995 }
1996
1997 void Method::clear_breakpoint(int bci) {
1998 assert(bci >= 0, "");
1999 clear_matches(this, bci);
2000 }
2001
2002 void Method::clear_all_breakpoints() {
2003 clear_matches(this, -1);
2004 }
2005
2006 #endif // INCLUDE_JVMTI
2007
2008 int Method::invocation_count() const {
2009 MethodCounters* mcs = method_counters();
2010 MethodData* mdo = method_data();
2011 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) ||
2012 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) {
2013 return InvocationCounter::count_limit;
2014 } else {
2015 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) +
2016 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0);
2017 }
2018 }
2019
2020 int Method::backedge_count() const {
2021 MethodCounters* mcs = method_counters();
2022 MethodData* mdo = method_data();
2023 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) ||
2024 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) {
2025 return InvocationCounter::count_limit;
2026 } else {
2027 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) +
2028 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0);
2029 }
2030 }
2031
2032 int Method::highest_comp_level() const {
2033 const MethodCounters* mcs = method_counters();
2034 if (mcs != nullptr) {
2035 return mcs->highest_comp_level();
2036 } else {
2037 return CompLevel_none;
2038 }
2039 }
2040
2041 int Method::highest_osr_comp_level() const {
2042 const MethodCounters* mcs = method_counters();
2043 if (mcs != nullptr) {
2044 return mcs->highest_osr_comp_level();
2045 } else {
2046 return CompLevel_none;
2047 }
2048 }
2049
2050 void Method::set_highest_comp_level(int level) {
2051 MethodCounters* mcs = method_counters();
2052 if (mcs != nullptr) {
2053 mcs->set_highest_comp_level(level);
2054 }
2055 }
2056
2057 void Method::set_highest_osr_comp_level(int level) {
2058 MethodCounters* mcs = method_counters();
2059 if (mcs != nullptr) {
2060 mcs->set_highest_osr_comp_level(level);
2061 }
2062 }
2063
2064 #if INCLUDE_JVMTI
2065
2066 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2067 _bci = bci;
2068 _name_index = m->name_index();
2069 _signature_index = m->signature_index();
2070 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2071 if (_orig_bytecode == Bytecodes::_breakpoint)
2072 _orig_bytecode = m->orig_bytecode_at(_bci);
2073 _next = nullptr;
2074 }
2075
2076 void BreakpointInfo::set(Method* method) {
2077 #ifdef ASSERT
2078 {
2079 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2080 if (code == Bytecodes::_breakpoint)
2081 code = method->orig_bytecode_at(_bci);
2082 assert(orig_bytecode() == code, "original bytecode must be the same");
2083 }
2084 #endif
2085 Thread *thread = Thread::current();
2086 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2087 method->incr_number_of_breakpoints(thread);
2088 {
2089 // Deoptimize all dependents on this method
2090 HandleMark hm(thread);
2091 methodHandle mh(thread, method);
2092 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2093 }
2094 }
2095
2096 void BreakpointInfo::clear(Method* method) {
2097 *method->bcp_from(_bci) = orig_bytecode();
2098 assert(method->number_of_breakpoints() > 0, "must not go negative");
2099 method->decr_number_of_breakpoints(Thread::current());
2100 }
2101
2102 #endif // INCLUDE_JVMTI
2103
2104 // jmethodID handling
2105
2106 // This is a block allocating object, sort of like JNIHandleBlock, only a
2107 // lot simpler.
2108 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2109 // never get rid of it.
2110
2111 static const int min_block_size = 8;
2112
2113 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2114 friend class JNIMethodBlock;
2115 Method** _methods;
2116 int _number_of_methods;
2117 int _top;
2118 JNIMethodBlockNode* _next;
2119
2120 public:
2121
2122 JNIMethodBlockNode(int num_methods = min_block_size);
2123
2124 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2125
2126 void ensure_methods(int num_addl_methods) {
2127 if (_top < _number_of_methods) {
2128 num_addl_methods -= _number_of_methods - _top;
2129 if (num_addl_methods <= 0) {
2130 return;
2131 }
2132 }
2133 if (_next == nullptr) {
2134 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2135 } else {
2136 _next->ensure_methods(num_addl_methods);
2137 }
2138 }
2139 };
2140
2141 class JNIMethodBlock : public CHeapObj<mtClass> {
2142 JNIMethodBlockNode _head;
2143 JNIMethodBlockNode *_last_free;
2144 public:
2145 static Method* const _free_method;
2146
2147 JNIMethodBlock(int initial_capacity = min_block_size)
2148 : _head(initial_capacity), _last_free(&_head) {}
2149
2150 void ensure_methods(int num_addl_methods) {
2151 _last_free->ensure_methods(num_addl_methods);
2152 }
2153
2154 Method** add_method(Method* m) {
2155 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2156 if (b->_top < b->_number_of_methods) {
2157 // top points to the next free entry.
2158 int i = b->_top;
2159 b->_methods[i] = m;
2160 b->_top++;
2161 _last_free = b;
2162 return &(b->_methods[i]);
2163 } else if (b->_top == b->_number_of_methods) {
2164 // if the next free entry ran off the block see if there's a free entry
2165 for (int i = 0; i < b->_number_of_methods; i++) {
2166 if (b->_methods[i] == _free_method) {
2167 b->_methods[i] = m;
2168 _last_free = b;
2169 return &(b->_methods[i]);
2170 }
2171 }
2172 // Only check each block once for frees. They're very unlikely.
2173 // Increment top past the end of the block.
2174 b->_top++;
2175 }
2176 // need to allocate a next block.
2177 if (b->_next == nullptr) {
2178 b->_next = _last_free = new JNIMethodBlockNode();
2179 }
2180 }
2181 guarantee(false, "Should always allocate a free block");
2182 return nullptr;
2183 }
2184
2185 bool contains(Method** m) {
2186 if (m == nullptr) return false;
2187 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2188 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2189 // This is a bit of extra checking, for two reasons. One is
2190 // that contains() deals with pointers that are passed in by
2191 // JNI code, so making sure that the pointer is aligned
2192 // correctly is valuable. The other is that <= and > are
2193 // technically not defined on pointers, so the if guard can
2194 // pass spuriously; no modern compiler is likely to make that
2195 // a problem, though (and if one did, the guard could also
2196 // fail spuriously, which would be bad).
2197 ptrdiff_t idx = m - b->_methods;
2198 if (b->_methods + idx == m) {
2199 return true;
2200 }
2201 }
2202 }
2203 return false; // not found
2204 }
2205
2206 // Doesn't really destroy it, just marks it as free so it can be reused.
2207 void destroy_method(Method** m) {
2208 #ifdef ASSERT
2209 assert(contains(m), "should be a methodID");
2210 #endif // ASSERT
2211 *m = _free_method;
2212 }
2213
2214 // During class unloading the methods are cleared, which is different
2215 // than freed.
2216 void clear_all_methods() {
2217 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2218 for (int i = 0; i< b->_number_of_methods; i++) {
2219 b->_methods[i] = nullptr;
2220 }
2221 }
2222 }
2223 #ifndef PRODUCT
2224 int count_methods() {
2225 // count all allocated methods
2226 int count = 0;
2227 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2228 for (int i = 0; i< b->_number_of_methods; i++) {
2229 if (b->_methods[i] != _free_method) count++;
2230 }
2231 }
2232 return count;
2233 }
2234 #endif // PRODUCT
2235 };
2236
2237 // Something that can't be mistaken for an address or a markWord
2238 Method* const JNIMethodBlock::_free_method = (Method*)55;
2239
2240 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2241 _number_of_methods = MAX2(num_methods, min_block_size);
2242 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2243 for (int i = 0; i < _number_of_methods; i++) {
2244 _methods[i] = JNIMethodBlock::_free_method;
2245 }
2246 }
2247
2248 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2249 // Have to add jmethod_ids() to class loader data thread-safely.
2250 // Also have to add the method to the list safely, which the lock
2251 // protects as well.
2252 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2253 if (cld->jmethod_ids() == nullptr) {
2254 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2255 } else {
2256 cld->jmethod_ids()->ensure_methods(capacity);
2257 }
2258 }
2259
2260 // Add a method id to the jmethod_ids
2261 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2262 // Have to add jmethod_ids() to class loader data thread-safely.
2263 // Also have to add the method to the list safely, which the lock
2264 // protects as well.
2265 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
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 // Mark a jmethodID as free. This is called when there is a data race in
2279 // InstanceKlass while creating the jmethodID cache.
2280 void Method::destroy_jmethod_id(ClassLoaderData* cld, jmethodID m) {
2281 Method** ptr = (Method**)m;
2282 assert(cld->jmethod_ids() != nullptr, "should have method handles");
2283 cld->jmethod_ids()->destroy_method(ptr);
2284 }
2285
2286 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2287 // Can't assert the method_holder is the same because the new method has the
2288 // scratch method holder.
2289 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2290 == new_method->method_holder()->class_loader() ||
2291 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2292 "changing to a different class loader");
2293 // Just change the method in place, jmethodID pointer doesn't change.
2294 *((Method**)jmid) = new_method;
2295 }
2296
2297 bool Method::is_method_id(jmethodID mid) {
2298 Method* m = resolve_jmethod_id(mid);
2299 assert(m != nullptr, "should be called with non-null method");
2300 InstanceKlass* ik = m->method_holder();
2301 ClassLoaderData* cld = ik->class_loader_data();
2302 if (cld->jmethod_ids() == nullptr) return false;
2303 return (cld->jmethod_ids()->contains((Method**)mid));
2304 }
2305
2306 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2307 if (mid == nullptr) return nullptr;
2308 Method* o = resolve_jmethod_id(mid);
2309 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2310 return nullptr;
2311 }
2312 // Method should otherwise be valid. Assert for testing.
2313 assert(is_valid_method(o), "should be valid jmethodid");
2314 // If the method's class holder object is unreferenced, but not yet marked as
2315 // unloaded, we need to return null here too because after a safepoint, its memory
2316 // will be reclaimed.
2317 return o->method_holder()->is_loader_alive() ? o : nullptr;
2318 };
2319
2320 void Method::set_on_stack(const bool value) {
2321 // Set both the method itself and its constant pool. The constant pool
2322 // on stack means some method referring to it is also on the stack.
2323 constants()->set_on_stack(value);
2324
2325 bool already_set = on_stack_flag();
2326 set_on_stack_flag(value);
2327 if (value && !already_set) {
2328 MetadataOnStackMark::record(this);
2329 }
2330 }
2331
2332 void Method::record_gc_epoch() {
2333 // If any method is on the stack in continuations, none of them can be reclaimed,
2334 // so save the marking cycle to check for the whole class in the cpCache.
2335 // The cpCache is writeable.
2336 constants()->cache()->record_gc_epoch();
2337 }
2338
2339 // Called when the class loader is unloaded to make all methods weak.
2340 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2341 loader_data->jmethod_ids()->clear_all_methods();
2342 }
2343
2344 void Method::clear_jmethod_id() {
2345 // Being at a safepoint prevents racing against other class redefinitions
2346 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2347 // The jmethodID is not stored in the Method instance, we need to look it up first
2348 jmethodID methodid = find_jmethod_id_or_null();
2349 // We need to make sure that jmethodID actually resolves to this method
2350 // - multiple redefined versions may share jmethodID slots and if a method
2351 // has already been rewired to a newer version we could be removing reference
2352 // to a still existing method instance
2353 if (methodid != nullptr && *((Method**)methodid) == this) {
2354 *((Method**)methodid) = nullptr;
2355 }
2356 }
2357
2358 bool Method::has_method_vptr(const void* ptr) {
2359 Method m;
2360 // This assumes that the vtbl pointer is the first word of a C++ object.
2361 return dereference_vptr(&m) == dereference_vptr(ptr);
2362 }
2363
2364 // Check that this pointer is valid by checking that the vtbl pointer matches
2365 bool Method::is_valid_method(const Method* m) {
2366 if (m == nullptr) {
2367 return false;
2368 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2369 // Quick sanity check on pointer.
2370 return false;
2371 } else if (!os::is_readable_range(m, m + 1)) {
2372 return false;
2373 } else if (m->is_shared()) {
2374 return CppVtables::is_valid_shared_method(m);
2375 } else if (Metaspace::contains_non_shared(m)) {
2376 return has_method_vptr((const void*)m);
2377 } else {
2378 return false;
2379 }
2380 }
2381
2382 bool Method::is_scalarized_arg(int idx) const {
2383 if (!has_scalarized_args()) {
2384 return false;
2385 }
2386 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID
2387 int depth = 0;
2388 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2389 for (int i = 0; i < sig->length(); i++) {
2390 BasicType bt = sig->at(i)._bt;
2391 if (bt == T_METADATA) {
2392 depth++;
2393 }
2394 if (idx == 0) {
2395 break; // Argument found
2396 }
2397 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2398 depth--;
2399 }
2400 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2401 idx--; // Advance to next argument
2402 }
2403 }
2404 return depth != 0;
2405 }
2406
2407 #ifndef PRODUCT
2408 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2409 out->print("%d", loader_data->jmethod_ids()->count_methods());
2410 }
2411 #endif // PRODUCT
2412
2413
2414 // Printing
2415
2416 #ifndef PRODUCT
2417
2418 void Method::print_on(outputStream* st) const {
2419 ResourceMark rm;
2420 assert(is_method(), "must be method");
2421 st->print_cr("%s", internal_name());
2422 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2423 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2424 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2425 constants()->print_value_on(st); st->cr();
2426 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2427 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2428 st->print (" - name: "); name()->print_value_on(st); st->cr();
2429 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2430 st->print_cr(" - max stack: %d", max_stack());
2431 st->print_cr(" - max locals: %d", max_locals());
2432 st->print_cr(" - size of params: %d", size_of_parameters());
2433 st->print_cr(" - method size: %d", method_size());
2434 if (intrinsic_id() != vmIntrinsics::_none)
2435 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2436 if (highest_comp_level() != CompLevel_none)
2437 st->print_cr(" - highest level: %d", highest_comp_level());
2438 st->print_cr(" - vtable index: %d", _vtable_index);
2439 #ifdef ASSERT
2440 if (valid_itable_index())
2441 st->print_cr(" - itable index: %d", itable_index());
2442 #endif
2443 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2444 st->print( " - adapters: ");
2445 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2446 if (a == nullptr)
2447 st->print_cr(PTR_FORMAT, p2i(a));
2448 else
2449 a->print_adapter_on(st);
2450 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2451 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2452 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry()));
2453 st->print_cr(" - code size: %d", code_size());
2454 if (code_size() != 0) {
2455 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2456 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2457 }
2458 if (method_data() != nullptr) {
2459 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2460 }
2461 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2462 if (checked_exceptions_length() > 0) {
2463 CheckedExceptionElement* table = checked_exceptions_start();
2464 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2465 if (Verbose) {
2466 for (int i = 0; i < checked_exceptions_length(); i++) {
2467 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2468 }
2469 }
2470 }
2471 if (has_linenumber_table()) {
2472 u_char* table = compressed_linenumber_table();
2473 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2474 if (Verbose) {
2475 CompressedLineNumberReadStream stream(table);
2476 while (stream.read_pair()) {
2477 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2478 }
2479 }
2480 }
2481 st->print_cr(" - localvar length: %d", localvariable_table_length());
2482 if (localvariable_table_length() > 0) {
2483 LocalVariableTableElement* table = localvariable_table_start();
2484 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2485 if (Verbose) {
2486 for (int i = 0; i < localvariable_table_length(); i++) {
2487 int bci = table[i].start_bci;
2488 int len = table[i].length;
2489 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2490 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2491 int slot = table[i].slot;
2492 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2493 }
2494 }
2495 }
2496 if (code() != nullptr) {
2497 st->print (" - compiled code: ");
2498 code()->print_value_on(st);
2499 }
2500 if (is_native()) {
2501 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2502 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2503 }
2504 }
2505
2506 void Method::print_linkage_flags(outputStream* st) {
2507 access_flags().print_on(st);
2508 if (is_default_method()) {
2509 st->print("default ");
2510 }
2511 if (is_overpass()) {
2512 st->print("overpass ");
2513 }
2514 }
2515 #endif //PRODUCT
2516
2517 void Method::print_value_on(outputStream* st) const {
2518 assert(is_method(), "must be method");
2519 st->print("%s", internal_name());
2520 print_address_on(st);
2521 st->print(" ");
2522 if (WizardMode) access_flags().print_on(st);
2523 name()->print_value_on(st);
2524 st->print(" ");
2525 signature()->print_value_on(st);
2526 st->print(" in ");
2527 method_holder()->print_value_on(st);
2528 if (WizardMode) st->print("#%d", _vtable_index);
2529 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2530 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2531 }
2532
2533 // Verification
2534
2535 void Method::verify_on(outputStream* st) {
2536 guarantee(is_method(), "object must be method");
2537 guarantee(constants()->is_constantPool(), "should be constant pool");
2538 MethodData* md = method_data();
2539 guarantee(md == nullptr ||
2540 md->is_methodData(), "should be method data");
2541 }