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/vm_version.hpp"
77 #include "utilities/align.hpp"
78 #include "utilities/quickSort.hpp"
79 #include "utilities/vmError.hpp"
80 #include "utilities/xmlstream.hpp"
81
82 // Implementation of Method
83
84 Method* Method::allocate(ClassLoaderData* loader_data,
85 int byte_code_size,
86 AccessFlags access_flags,
87 InlineTableSizes* sizes,
88 ConstMethod::MethodType method_type,
89 Symbol* name,
90 TRAPS) {
91 assert(!access_flags.is_native() || byte_code_size == 0,
92 "native methods should not contain byte codes");
93 ConstMethod* cm = ConstMethod::allocate(loader_data,
94 byte_code_size,
95 sizes,
96 method_type,
97 CHECK_NULL);
98 int size = Method::size(access_flags.is_native());
99 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
100 }
101
102 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
103 NoSafepointVerifier no_safepoint;
104 set_constMethod(xconst);
105 set_access_flags(access_flags);
106 set_intrinsic_id(vmIntrinsics::_none);
107 clear_method_data();
108 clear_method_counters();
109 set_vtable_index(Method::garbage_vtable_index);
110
111 // Fix and bury in Method*
112 set_interpreter_entry(nullptr); // sets i2i entry and from_int
113 set_adapter_entry(nullptr);
114 Method::clear_code(); // from_c/from_i get set to c2i/i2i
115
116 if (access_flags.is_native()) {
117 clear_native_function();
118 set_signature_handler(nullptr);
119 }
120 NOT_PRODUCT(set_compiled_invocation_count(0);)
121 // Name is very useful for debugging.
122 NOT_PRODUCT(_name = name;)
123 }
124
125 // Release Method*. The nmethod will be gone when we get here because
126 // we've walked the code cache.
127 void Method::deallocate_contents(ClassLoaderData* loader_data) {
128 MetadataFactory::free_metadata(loader_data, constMethod());
129 set_constMethod(nullptr);
130 MetadataFactory::free_metadata(loader_data, method_data());
131 clear_method_data();
132 MetadataFactory::free_metadata(loader_data, method_counters());
133 clear_method_counters();
134 // The nmethod will be gone when we get here.
135 if (code() != nullptr) _code = nullptr;
136 }
137
138 void Method::release_C_heap_structures() {
139 if (method_data()) {
140 method_data()->release_C_heap_structures();
141
142 // Destroy MethodData embedded lock
143 method_data()->~MethodData();
144 }
145 }
146
147 address Method::get_i2c_entry() {
148 assert(adapter() != nullptr, "must have");
149 return adapter()->get_i2c_entry();
150 }
151
152 address Method::get_c2i_entry() {
153 assert(adapter() != nullptr, "must have");
154 return adapter()->get_c2i_entry();
155 }
156
157 address Method::get_c2i_inline_entry() {
158 assert(adapter() != nullptr, "must have");
159 return adapter()->get_c2i_inline_entry();
160 }
161
162 address Method::get_c2i_unverified_entry() {
163 assert(adapter() != nullptr, "must have");
164 return adapter()->get_c2i_unverified_entry();
165 }
166
167 address Method::get_c2i_unverified_inline_entry() {
168 assert(adapter() != nullptr, "must have");
169 return adapter()->get_c2i_unverified_inline_entry();
170 }
171
172 address Method::get_c2i_no_clinit_check_entry() {
173 assert(VM_Version::supports_fast_class_init_checks(), "");
174 assert(adapter() != nullptr, "must have");
175 return adapter()->get_c2i_no_clinit_check_entry();
176 }
177
178 char* Method::name_and_sig_as_C_string() const {
179 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
180 }
181
182 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
183 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
184 }
185
186 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
187 const char* klass_name = klass->external_name();
188 int klass_name_len = (int)strlen(klass_name);
189 int method_name_len = method_name->utf8_length();
190 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
191 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
192 strcpy(dest, klass_name);
193 dest[klass_name_len] = '.';
194 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
195 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
196 dest[len] = 0;
197 return dest;
198 }
199
200 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
201 Symbol* klass_name = klass->name();
202 klass_name->as_klass_external_name(buf, size);
203 int len = (int)strlen(buf);
204
205 if (len < size - 1) {
206 buf[len++] = '.';
207
208 method_name->as_C_string(&(buf[len]), size - len);
209 len = (int)strlen(buf);
210
211 signature->as_C_string(&(buf[len]), size - len);
212 }
213
214 return buf;
215 }
216
217 const char* Method::external_name() const {
218 return external_name(constants()->pool_holder(), name(), signature());
219 }
220
221 void Method::print_external_name(outputStream *os) const {
222 print_external_name(os, constants()->pool_holder(), name(), signature());
223 }
224
225 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
226 stringStream ss;
227 print_external_name(&ss, klass, method_name, signature);
228 return ss.as_string();
229 }
230
231 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
232 signature->print_as_signature_external_return_type(os);
233 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
234 signature->print_as_signature_external_parameters(os);
235 os->print(")");
236 }
237
238 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
239 if (log_is_enabled(Debug, exceptions)) {
240 ResourceMark rm(THREAD);
241 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
242 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
243 }
244 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
245 // access exception table
246 ExceptionTable table(mh());
247 int length = table.length();
248 // iterate through all entries sequentially
249 constantPoolHandle pool(THREAD, mh->constants());
250 for (int i = 0; i < length; i ++) {
251 //reacquire the table in case a GC happened
252 ExceptionTable table(mh());
253 int beg_bci = table.start_pc(i);
254 int end_bci = table.end_pc(i);
255 assert(beg_bci <= end_bci, "inconsistent exception table");
256 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
257 beg_bci, end_bci);
258
259 if (beg_bci <= throw_bci && throw_bci < end_bci) {
260 // exception handler bci range covers throw_bci => investigate further
261 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
262
263 int handler_bci = table.handler_pc(i);
264 int klass_index = table.catch_type_index(i);
265 if (klass_index == 0) {
266 if (log_is_enabled(Info, exceptions)) {
267 ResourceMark rm(THREAD);
268 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
269 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
270 }
271 return handler_bci;
272 } else if (ex_klass == nullptr) {
273 // Is this even possible?
274 if (log_is_enabled(Info, exceptions)) {
275 ResourceMark rm(THREAD);
276 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
277 mh()->name()->as_C_string(), handler_bci);
278 }
279 return handler_bci;
280 } else {
281 if (log_is_enabled(Debug, exceptions)) {
282 ResourceMark rm(THREAD);
283 log_debug(exceptions)(" - resolving catch type \"%s\"",
284 pool->klass_name_at(klass_index)->as_C_string());
285 }
286 // we know the exception class => get the constraint class
287 // this may require loading of the constraint class; if verification
288 // fails or some other exception occurs, return handler_bci
289 Klass* k = pool->klass_at(klass_index, THREAD);
290 if (HAS_PENDING_EXCEPTION) {
291 if (log_is_enabled(Debug, exceptions)) {
292 ResourceMark rm(THREAD);
293 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
294 PENDING_EXCEPTION->klass()->external_name());
295 }
296 return handler_bci;
297 }
298 assert(k != nullptr, "klass not loaded");
299 if (ex_klass->is_subtype_of(k)) {
300 if (log_is_enabled(Info, exceptions)) {
301 ResourceMark rm(THREAD);
302 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
303 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
304 }
305 return handler_bci;
306 }
307 }
308 }
309 }
310
311 if (log_is_enabled(Debug, exceptions)) {
312 ResourceMark rm(THREAD);
313 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
314 ex_klass->external_name(), mh->name()->as_C_string());
315 }
316
317 return -1;
318 }
319
320 void Method::mask_for(int bci, InterpreterOopMap* mask) {
321 methodHandle h_this(Thread::current(), this);
322 // Only GC uses the OopMapCache during thread stack root scanning
323 // any other uses generate an oopmap but do not save it in the cache.
324 if (Universe::heap()->is_gc_active()) {
325 method_holder()->mask_for(h_this, bci, mask);
326 } else {
327 OopMapCache::compute_one_oop_map(h_this, bci, mask);
328 }
329 return;
330 }
331
332
333 int Method::bci_from(address bcp) const {
334 if (is_native() && bcp == 0) {
335 return 0;
336 }
337 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
338 // may call this after interrupting a nested ResourceMark.
339 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
340 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
341
342 return int(bcp - code_base());
343 }
344
345
346 int Method::validate_bci(int bci) const {
347 return (bci == 0 || bci < code_size()) ? bci : -1;
348 }
349
350 // Return bci if it appears to be a valid bcp
351 // Return -1 otherwise.
352 // Used by profiling code, when invalid data is a possibility.
353 // The caller is responsible for validating the Method* itself.
354 int Method::validate_bci_from_bcp(address bcp) const {
355 // keep bci as -1 if not a valid bci
356 int bci = -1;
357 if (bcp == 0 || bcp == code_base()) {
358 // code_size() may return 0 and we allow 0 here
359 // the method may be native
360 bci = 0;
361 } else if (contains(bcp)) {
362 bci = int(bcp - code_base());
363 }
364 // Assert that if we have dodged any asserts, bci is negative.
365 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
366 return bci;
367 }
368
369 address Method::bcp_from(int bci) const {
370 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
371 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
372 address bcp = code_base() + bci;
373 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
374 return bcp;
375 }
376
377 address Method::bcp_from(address bcp) const {
378 if (is_native() && bcp == nullptr) {
379 return code_base();
380 } else {
381 return bcp;
382 }
383 }
384
385 int Method::size(bool is_native) {
386 // If native, then include pointers for native_function and signature_handler
387 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
388 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
389 return align_metadata_size(header_size() + extra_words);
390 }
391
392 Symbol* Method::klass_name() const {
393 return method_holder()->name();
394 }
395
396 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
397 log_trace(cds)("Iter(Method): %p", this);
398
399 if (!method_holder()->is_rewritten() || CDSConfig::is_valhalla_preview()) {
400 it->push(&_constMethod, MetaspaceClosure::_writable);
401 } else {
402 it->push(&_constMethod);
403 }
404 it->push(&_method_data);
405 it->push(&_method_counters);
406 NOT_PRODUCT(it->push(&_name);)
407 }
408
409 #if INCLUDE_CDS
410 // Attempt to return method to original state. Clear any pointers
411 // (to objects outside the shared spaces). We won't be able to predict
412 // where they should point in a new JVM. Further initialize some
413 // entries now in order allow them to be write protected later.
414
415 void Method::remove_unshareable_info() {
416 unlink_method();
417 JFR_ONLY(REMOVE_METHOD_ID(this);)
418 }
419
420 void Method::restore_unshareable_info(TRAPS) {
421 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
422 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
423 }
424 #endif
425
426 void Method::set_vtable_index(int index) {
427 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
428 // At runtime initialize_vtable is rerun as part of link_class_impl()
429 // for a shared class loaded by the non-boot loader to obtain the loader
430 // constraints based on the runtime classloaders' context.
431 return; // don't write into the shared class
432 } else {
433 _vtable_index = index;
434 }
435 }
436
437 void Method::set_itable_index(int index) {
438 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
439 // At runtime initialize_itable is rerun as part of link_class_impl()
440 // for a shared class loaded by the non-boot loader to obtain the loader
441 // constraints based on the runtime classloaders' context. The dumptime
442 // itable index should be the same as the runtime index.
443 assert(_vtable_index == itable_index_max - index,
444 "archived itable index is different from runtime index");
445 return; // don’t write into the shared class
446 } else {
447 _vtable_index = itable_index_max - index;
448 }
449 assert(valid_itable_index(), "");
450 }
451
452 // The RegisterNatives call being attempted tried to register with a method that
453 // is not native. Ask JVM TI what prefixes have been specified. Then check
454 // to see if the native method is now wrapped with the prefixes. See the
455 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
456 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
457 #if INCLUDE_JVMTI
458 ResourceMark rm(THREAD);
459 Method* method;
460 int name_len = name->utf8_length();
461 char* name_str = name->as_utf8();
462 int prefix_count;
463 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
464 for (int i = 0; i < prefix_count; i++) {
465 char* prefix = prefixes[i];
466 int prefix_len = (int)strlen(prefix);
467
468 // try adding this prefix to the method name and see if it matches another method name
469 int trial_len = name_len + prefix_len;
470 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
471 strcpy(trial_name_str, prefix);
472 strcat(trial_name_str, name_str);
473 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
474 if (trial_name == nullptr) {
475 continue; // no such symbol, so this prefix wasn't used, try the next prefix
476 }
477 method = k->lookup_method(trial_name, signature);
478 if (method == nullptr) {
479 continue; // signature doesn't match, try the next prefix
480 }
481 if (method->is_native()) {
482 method->set_is_prefixed_native();
483 return method; // wahoo, we found a prefixed version of the method, return it
484 }
485 // found as non-native, so prefix is good, add it, probably just need more prefixes
486 name_len = trial_len;
487 name_str = trial_name_str;
488 }
489 #endif // INCLUDE_JVMTI
490 return nullptr; // not found
491 }
492
493 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
494 Method* method = k->lookup_method(name, signature);
495 if (method == nullptr) {
496 ResourceMark rm(THREAD);
497 stringStream st;
498 st.print("Method '");
499 print_external_name(&st, k, name, signature);
500 st.print("' name or signature does not match");
501 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
502 }
503 if (!method->is_native()) {
504 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
505 method = find_prefixed_native(k, name, signature, THREAD);
506 if (method == nullptr) {
507 ResourceMark rm(THREAD);
508 stringStream st;
509 st.print("Method '");
510 print_external_name(&st, k, name, signature);
511 st.print("' is not declared as native");
512 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
513 }
514 }
515
516 if (entry != nullptr) {
517 method->set_native_function(entry, native_bind_event_is_interesting);
518 } else {
519 method->clear_native_function();
520 }
521 if (log_is_enabled(Debug, jni, resolve)) {
522 ResourceMark rm(THREAD);
523 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
524 method->method_holder()->external_name(),
525 method->name()->as_C_string());
526 }
527 return true;
528 }
529
530 bool Method::was_executed_more_than(int n) {
531 // Invocation counter is reset when the Method* is compiled.
532 // If the method has compiled code we therefore assume it has
533 // be executed more than n times.
534 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
535 // interpreter doesn't bump invocation counter of trivial methods
536 // compiler does not bump invocation counter of compiled methods
537 return true;
538 }
539 else if ((method_counters() != nullptr &&
540 method_counters()->invocation_counter()->carry()) ||
541 (method_data() != nullptr &&
542 method_data()->invocation_counter()->carry())) {
543 // The carry bit is set when the counter overflows and causes
544 // a compilation to occur. We don't know how many times
545 // the counter has been reset, so we simply assume it has
546 // been executed more than n times.
547 return true;
548 } else {
549 return invocation_count() > n;
550 }
551 }
552
553 void Method::print_invocation_count() {
554 //---< compose+print method return type, klass, name, and signature >---
555 if (is_static()) tty->print("static ");
556 if (is_final()) tty->print("final ");
557 if (is_synchronized()) tty->print("synchronized ");
558 if (is_native()) tty->print("native ");
559 tty->print("%s::", method_holder()->external_name());
560 name()->print_symbol_on(tty);
561 signature()->print_symbol_on(tty);
562
563 if (WizardMode) {
564 // dump the size of the byte codes
565 tty->print(" {%d}", code_size());
566 }
567 tty->cr();
568
569 // Counting based on signed int counters tends to overflow with
570 // longer-running workloads on fast machines. The counters under
571 // consideration here, however, are limited in range by counting
572 // logic. See InvocationCounter:count_limit for example.
573 // No "overflow precautions" need to be implemented here.
574 tty->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
575 tty->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
576 tty->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
577
578 if (method_data() != nullptr) {
579 tty->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
580 }
581
582 #ifndef PRODUCT
583 if (CountCompiledCalls) {
584 tty->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
585 }
586 #endif
587 }
588
589 // Build a MethodData* object to hold profiling information collected on this
590 // method when requested.
591 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
592 // Do not profile the method if metaspace has hit an OOM previously
593 // allocating profiling data. Callers clear pending exception so don't
594 // add one here.
595 if (ClassLoaderDataGraph::has_metaspace_oom()) {
596 return;
597 }
598
599 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
600 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
601 if (HAS_PENDING_EXCEPTION) {
602 CompileBroker::log_metaspace_failure();
603 ClassLoaderDataGraph::set_metaspace_oom(true);
604 return; // return the exception (which is cleared)
605 }
606
607 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
608 MetadataFactory::free_metadata(loader_data, method_data);
609 return;
610 }
611
612 if (PrintMethodData && (Verbose || WizardMode)) {
613 ResourceMark rm(THREAD);
614 tty->print("build_profiling_method_data for ");
615 method->print_name(tty);
616 tty->cr();
617 // At the end of the run, the MDO, full of data, will be dumped.
618 }
619 }
620
621 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
622 // Do not profile the method if metaspace has hit an OOM previously
623 if (ClassLoaderDataGraph::has_metaspace_oom()) {
624 return nullptr;
625 }
626
627 methodHandle mh(current, m);
628 MethodCounters* counters;
629 if (current->is_Java_thread()) {
630 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
631 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
632 // if needed.
633 counters = MethodCounters::allocate_with_exception(mh, THREAD);
634 if (HAS_PENDING_EXCEPTION) {
635 CLEAR_PENDING_EXCEPTION;
636 }
637 } else {
638 // Call metaspace allocation that doesn't throw exception if the
639 // current thread isn't a JavaThread, ie. the VMThread.
640 counters = MethodCounters::allocate_no_exception(mh);
641 }
642
643 if (counters == nullptr) {
644 CompileBroker::log_metaspace_failure();
645 ClassLoaderDataGraph::set_metaspace_oom(true);
646 return nullptr;
647 }
648
649 if (!mh->init_method_counters(counters)) {
650 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
651 }
652
653 return mh->method_counters();
654 }
655
656 bool Method::init_method_counters(MethodCounters* counters) {
657 // Try to install a pointer to MethodCounters, return true on success.
658 return Atomic::replace_if_null(&_method_counters, counters);
659 }
660
661 void Method::set_exception_handler_entered(int handler_bci) {
662 if (ProfileExceptionHandlers) {
663 MethodData* mdo = method_data();
664 if (mdo != nullptr) {
665 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
666 handler_data.set_exception_handler_entered();
667 }
668 }
669 }
670
671 int Method::extra_stack_words() {
672 // not an inline function, to avoid a header dependency on Interpreter
673 return extra_stack_entries() * Interpreter::stackElementSize;
674 }
675
676 // InlineKlass the method is declared to return. This must not
677 // safepoint as it is called with references live on the stack at
678 // locations the GC is unaware of.
679 InlineKlass* Method::returns_inline_type(Thread* thread) const {
680 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
681 NoSafepointVerifier nsv;
682 SignatureStream ss(signature());
683 while (!ss.at_return_type()) {
684 ss.next();
685 }
686 return ss.as_inline_klass(method_holder());
687 }
688
689 bool Method::is_vanilla_constructor() const {
690 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
691 // which only calls the superclass vanilla constructor and possibly does stores of
692 // zero constants to local fields:
693 //
694 // aload_0, _fast_aload_0, or _nofast_aload_0
695 // invokespecial
696 // indexbyte1
697 // indexbyte2
698 //
699 // followed by an (optional) sequence of:
700 //
701 // aload_0
702 // aconst_null / iconst_0 / fconst_0 / dconst_0
703 // putfield
704 // indexbyte1
705 // indexbyte2
706 //
707 // followed by:
708 //
709 // return
710
711 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
712 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
713 int size = code_size();
714 // Check if size match
715 if (size == 0 || size % 5 != 0) return false;
716 address cb = code_base();
717 int last = size - 1;
718 if ((cb[0] != Bytecodes::_aload_0 && cb[0] != Bytecodes::_fast_aload_0 && cb[0] != Bytecodes::_nofast_aload_0) ||
719 cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
720 // Does not call superclass default constructor
721 return false;
722 }
723 // Check optional sequence
724 for (int i = 4; i < last; i += 5) {
725 if (cb[i] != Bytecodes::_aload_0) return false;
726 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
727 if (cb[i+2] != Bytecodes::_putfield) return false;
728 }
729 return true;
730 }
731
732
733 bool Method::compute_has_loops_flag() {
734 BytecodeStream bcs(methodHandle(Thread::current(), this));
735 Bytecodes::Code bc;
736
737 while ((bc = bcs.next()) >= 0) {
738 switch (bc) {
739 case Bytecodes::_ifeq:
740 case Bytecodes::_ifnull:
741 case Bytecodes::_iflt:
742 case Bytecodes::_ifle:
743 case Bytecodes::_ifne:
744 case Bytecodes::_ifnonnull:
745 case Bytecodes::_ifgt:
746 case Bytecodes::_ifge:
747 case Bytecodes::_if_icmpeq:
748 case Bytecodes::_if_icmpne:
749 case Bytecodes::_if_icmplt:
750 case Bytecodes::_if_icmpgt:
751 case Bytecodes::_if_icmple:
752 case Bytecodes::_if_icmpge:
753 case Bytecodes::_if_acmpeq:
754 case Bytecodes::_if_acmpne:
755 case Bytecodes::_goto:
756 case Bytecodes::_jsr:
757 if (bcs.dest() < bcs.next_bci()) {
758 return set_has_loops();
759 }
760 break;
761
762 case Bytecodes::_goto_w:
763 case Bytecodes::_jsr_w:
764 if (bcs.dest_w() < bcs.next_bci()) {
765 return set_has_loops();
766 }
767 break;
768
769 case Bytecodes::_lookupswitch: {
770 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
771 if (lookupswitch.default_offset() < 0) {
772 return set_has_loops();
773 } else {
774 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
775 LookupswitchPair pair = lookupswitch.pair_at(i);
776 if (pair.offset() < 0) {
777 return set_has_loops();
778 }
779 }
780 }
781 break;
782 }
783 case Bytecodes::_tableswitch: {
784 Bytecode_tableswitch tableswitch(this, bcs.bcp());
785 if (tableswitch.default_offset() < 0) {
786 return set_has_loops();
787 } else {
788 for (int i = 0; i < tableswitch.length(); ++i) {
789 if (tableswitch.dest_offset_at(i) < 0) {
790 return set_has_loops();
791 }
792 }
793 }
794 break;
795 }
796 default:
797 break;
798 }
799 }
800
801 _flags.set_has_loops_flag_init(true);
802 return false;
803 }
804
805 bool Method::is_final_method(AccessFlags class_access_flags) const {
806 // or "does_not_require_vtable_entry"
807 // default method or overpass can occur, is not final (reuses vtable entry)
808 // private methods in classes get vtable entries for backward class compatibility.
809 if (is_overpass() || is_default_method()) return false;
810 return is_final() || class_access_flags.is_final();
811 }
812
813 bool Method::is_final_method() const {
814 return is_final_method(method_holder()->access_flags());
815 }
816
817 bool Method::is_default_method() const {
818 if (method_holder() != nullptr &&
819 method_holder()->is_interface() &&
820 !is_abstract() && !is_private()) {
821 return true;
822 } else {
823 return false;
824 }
825 }
826
827 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
828 if (is_final_method(class_access_flags)) return true;
829 #ifdef ASSERT
830 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
831 if (class_access_flags.is_interface()) {
832 ResourceMark rm;
833 assert(is_nonv == is_static() || is_nonv == is_private(),
834 "nonvirtual unexpected for non-static, non-private: %s",
835 name_and_sig_as_C_string());
836 }
837 #endif
838 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
839 return vtable_index() == nonvirtual_vtable_index;
840 }
841
842 bool Method::can_be_statically_bound() const {
843 return can_be_statically_bound(method_holder()->access_flags());
844 }
845
846 bool Method::can_be_statically_bound(InstanceKlass* context) const {
847 return (method_holder() == context) && can_be_statically_bound();
848 }
849
850 /**
851 * Returns false if this is one of specially treated methods for
852 * which we have to provide stack trace in throw in compiled code.
853 * Returns true otherwise.
854 */
855 bool Method::can_omit_stack_trace() {
856 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
857 return false; // All methods in sun.invoke.util.ValueConversions
858 }
859 return true;
860 }
861
862 bool Method::is_accessor() const {
863 return is_getter() || is_setter();
864 }
865
866 bool Method::is_getter() const {
867 if (code_size() != 5) return false;
868 if (size_of_parameters() != 1) return false;
869 if (java_code_at(0) != Bytecodes::_aload_0) return false;
870 if (java_code_at(1) != Bytecodes::_getfield) return false;
871 switch (java_code_at(4)) {
872 case Bytecodes::_ireturn:
873 case Bytecodes::_lreturn:
874 case Bytecodes::_freturn:
875 case Bytecodes::_dreturn:
876 case Bytecodes::_areturn:
877 break;
878 default:
879 return false;
880 }
881 if (has_scalarized_return()) {
882 // Don't treat this as (trivial) getter method because the
883 // inline type should be returned in a scalarized form.
884 return false;
885 }
886 return true;
887 }
888
889 bool Method::is_setter() const {
890 if (code_size() != 6) return false;
891 if (java_code_at(0) != Bytecodes::_aload_0) return false;
892 switch (java_code_at(1)) {
893 case Bytecodes::_iload_1:
894 case Bytecodes::_aload_1:
895 case Bytecodes::_fload_1:
896 if (size_of_parameters() != 2) return false;
897 break;
898 case Bytecodes::_dload_1:
899 case Bytecodes::_lload_1:
900 if (size_of_parameters() != 3) return false;
901 break;
902 default:
903 return false;
904 }
905 if (java_code_at(2) != Bytecodes::_putfield) return false;
906 if (java_code_at(5) != Bytecodes::_return) return false;
907 if (has_scalarized_args()) {
908 // Don't treat this as (trivial) setter method because the
909 // inline type argument should be passed in a scalarized form.
910 return false;
911 }
912 return true;
913 }
914
915 bool Method::is_constant_getter() const {
916 int last_index = code_size() - 1;
917 // Check if the first 1-3 bytecodes are a constant push
918 // and the last bytecode is a return.
919 return (2 <= code_size() && code_size() <= 4 &&
920 Bytecodes::is_const(java_code_at(0)) &&
921 Bytecodes::length_for(java_code_at(0)) == last_index &&
922 Bytecodes::is_return(java_code_at(last_index)) &&
923 !has_scalarized_args());
924 }
925
926 bool Method::is_class_initializer() const {
927 // For classfiles version 51 or greater, ensure that the clinit method is
928 // static. Non-static methods with the name "<clinit>" are not static
929 // initializers. (older classfiles exempted for backward compatibility)
930 return (name() == vmSymbols::class_initializer_name() &&
931 (is_static() ||
932 method_holder()->major_version() < 51));
933 }
934
935 // A method named <init>, is a classic object constructor.
936 bool Method::is_object_constructor() const {
937 return name() == vmSymbols::object_initializer_name();
938 }
939
940 bool Method::needs_clinit_barrier() const {
941 return is_static() && !method_holder()->is_initialized();
942 }
943
944 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
945 int length = method->checked_exceptions_length();
946 if (length == 0) { // common case
947 return objArrayHandle(THREAD, Universe::the_empty_class_array());
948 } else {
949 methodHandle h_this(THREAD, method);
950 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
951 objArrayHandle mirrors (THREAD, m_oop);
952 for (int i = 0; i < length; i++) {
953 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
954 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
955 if (log_is_enabled(Warning, exceptions) &&
956 !k->is_subclass_of(vmClasses::Throwable_klass())) {
957 ResourceMark rm(THREAD);
958 log_warning(exceptions)(
959 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
960 k->external_name(), method->external_name());
961 }
962 mirrors->obj_at_put(i, k->java_mirror());
963 }
964 return mirrors;
965 }
966 };
967
968
969 int Method::line_number_from_bci(int bci) const {
970 int best_bci = 0;
971 int best_line = -1;
972 if (bci == SynchronizationEntryBCI) bci = 0;
973 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
974 // The line numbers are a short array of 2-tuples [start_pc, line_number].
975 // Not necessarily sorted and not necessarily one-to-one.
976 CompressedLineNumberReadStream stream(compressed_linenumber_table());
977 while (stream.read_pair()) {
978 if (stream.bci() == bci) {
979 // perfect match
980 return stream.line();
981 } else {
982 // update best_bci/line
983 if (stream.bci() < bci && stream.bci() >= best_bci) {
984 best_bci = stream.bci();
985 best_line = stream.line();
986 }
987 }
988 }
989 }
990 return best_line;
991 }
992
993
994 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
995 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
996 Thread *thread = Thread::current();
997 Symbol* klass_name = constants()->klass_name_at(klass_index);
998 Handle loader(thread, method_holder()->class_loader());
999 Handle prot (thread, method_holder()->protection_domain());
1000 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != nullptr;
1001 } else {
1002 return true;
1003 }
1004 }
1005
1006
1007 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1008 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1009 if (must_be_resolved) {
1010 // Make sure klass is resolved in constantpool.
1011 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
1012 return false;
1013 }
1014 }
1015 return is_klass_loaded_by_klass_index(klass_index);
1016 }
1017
1018
1019 void Method::set_native_function(address function, bool post_event_flag) {
1020 assert(function != nullptr, "use clear_native_function to unregister natives");
1021 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1022 address* native_function = native_function_addr();
1023
1024 // We can see racers trying to place the same native function into place. Once
1025 // is plenty.
1026 address current = *native_function;
1027 if (current == function) return;
1028 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1029 function != nullptr) {
1030 // native_method_throw_unsatisfied_link_error_entry() should only
1031 // be passed when post_event_flag is false.
1032 assert(function !=
1033 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1034 "post_event_flag mismatch");
1035
1036 // post the bind event, and possible change the bind function
1037 JvmtiExport::post_native_method_bind(this, &function);
1038 }
1039 *native_function = function;
1040 // This function can be called more than once. We must make sure that we always
1041 // use the latest registered method -> check if a stub already has been generated.
1042 // If so, we have to make it not_entrant.
1043 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
1044 if (nm != nullptr) {
1045 nm->make_not_entrant();
1046 }
1047 }
1048
1049
1050 bool Method::has_native_function() const {
1051 if (is_special_native_intrinsic())
1052 return false; // special-cased in SharedRuntime::generate_native_wrapper
1053 address func = native_function();
1054 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1055 }
1056
1057
1058 void Method::clear_native_function() {
1059 // Note: is_method_handle_intrinsic() is allowed here.
1060 set_native_function(
1061 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1062 !native_bind_event_is_interesting);
1063 this->unlink_code();
1064 }
1065
1066
1067 void Method::set_signature_handler(address handler) {
1068 address* signature_handler = signature_handler_addr();
1069 *signature_handler = handler;
1070 }
1071
1072
1073 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1074 assert(reason != nullptr, "must provide a reason");
1075 if (PrintCompilation && report) {
1076 ttyLocker ttyl;
1077 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1078 if (comp_level == CompLevel_all) {
1079 tty->print("all levels ");
1080 } else {
1081 tty->print("level %d ", comp_level);
1082 }
1083 this->print_short_name(tty);
1084 int size = this->code_size();
1085 if (size > 0) {
1086 tty->print(" (%d bytes)", size);
1087 }
1088 if (reason != nullptr) {
1089 tty->print(" %s", reason);
1090 }
1091 tty->cr();
1092 }
1093 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1094 ttyLocker ttyl;
1095 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
1096 os::current_thread_id(), is_osr, comp_level);
1097 if (reason != nullptr) {
1098 xtty->print(" reason=\'%s\'", reason);
1099 }
1100 xtty->method(this);
1101 xtty->stamp();
1102 xtty->end_elem();
1103 }
1104 }
1105
1106 bool Method::is_always_compilable() const {
1107 // Generated adapters must be compiled
1108 if (is_special_native_intrinsic() && is_synthetic()) {
1109 assert(!is_not_c1_compilable(), "sanity check");
1110 assert(!is_not_c2_compilable(), "sanity check");
1111 return true;
1112 }
1113
1114 return false;
1115 }
1116
1117 bool Method::is_not_compilable(int comp_level) const {
1118 if (number_of_breakpoints() > 0)
1119 return true;
1120 if (is_always_compilable())
1121 return false;
1122 if (comp_level == CompLevel_any)
1123 return is_not_c1_compilable() && is_not_c2_compilable();
1124 if (is_c1_compile(comp_level))
1125 return is_not_c1_compilable();
1126 if (is_c2_compile(comp_level))
1127 return is_not_c2_compilable();
1128 return false;
1129 }
1130
1131 // call this when compiler finds that this method is not compilable
1132 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1133 if (is_always_compilable()) {
1134 // Don't mark a method which should be always compilable
1135 return;
1136 }
1137 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1138 if (comp_level == CompLevel_all) {
1139 set_is_not_c1_compilable();
1140 set_is_not_c2_compilable();
1141 } else {
1142 if (is_c1_compile(comp_level))
1143 set_is_not_c1_compilable();
1144 if (is_c2_compile(comp_level))
1145 set_is_not_c2_compilable();
1146 }
1147 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1148 }
1149
1150 bool Method::is_not_osr_compilable(int comp_level) const {
1151 if (is_not_compilable(comp_level))
1152 return true;
1153 if (comp_level == CompLevel_any)
1154 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1155 if (is_c1_compile(comp_level))
1156 return is_not_c1_osr_compilable();
1157 if (is_c2_compile(comp_level))
1158 return is_not_c2_osr_compilable();
1159 return false;
1160 }
1161
1162 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1163 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1164 if (comp_level == CompLevel_all) {
1165 set_is_not_c1_osr_compilable();
1166 set_is_not_c2_osr_compilable();
1167 } else {
1168 if (is_c1_compile(comp_level))
1169 set_is_not_c1_osr_compilable();
1170 if (is_c2_compile(comp_level))
1171 set_is_not_c2_osr_compilable();
1172 }
1173 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1174 }
1175
1176 // Revert to using the interpreter and clear out the nmethod
1177 void Method::clear_code() {
1178 // this may be null if c2i adapters have not been made yet
1179 // Only should happen at allocate time.
1180 if (adapter() == nullptr) {
1181 _from_compiled_entry = nullptr;
1182 _from_compiled_inline_entry = nullptr;
1183 _from_compiled_inline_ro_entry = nullptr;
1184 } else {
1185 _from_compiled_entry = adapter()->get_c2i_entry();
1186 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1187 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1188 }
1189 OrderAccess::storestore();
1190 _from_interpreted_entry = _i2i_entry;
1191 OrderAccess::storestore();
1192 _code = nullptr;
1193 }
1194
1195 void Method::unlink_code(CompiledMethod *compare) {
1196 ConditionalMutexLocker ml(CompiledMethod_lock, !CompiledMethod_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1197 // We need to check if either the _code or _from_compiled_code_entry_point
1198 // refer to this nmethod because there is a race in setting these two fields
1199 // in Method* as seen in bugid 4947125.
1200 if (code() == compare ||
1201 from_compiled_entry() == compare->verified_entry_point()) {
1202 clear_code();
1203 }
1204 }
1205
1206 void Method::unlink_code() {
1207 ConditionalMutexLocker ml(CompiledMethod_lock, !CompiledMethod_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1208 clear_code();
1209 }
1210
1211 #if INCLUDE_CDS
1212 // Called by class data sharing to remove any entry points (which are not shared)
1213 void Method::unlink_method() {
1214 assert(CDSConfig::is_dumping_archive(), "sanity");
1215 _code = nullptr;
1216 _adapter = nullptr;
1217 _i2i_entry = nullptr;
1218 _from_compiled_entry = nullptr;
1219 _from_compiled_inline_entry = nullptr;
1220 _from_compiled_inline_ro_entry = nullptr;
1221 _from_interpreted_entry = nullptr;
1222
1223 if (is_native()) {
1224 *native_function_addr() = nullptr;
1225 set_signature_handler(nullptr);
1226 }
1227 NOT_PRODUCT(set_compiled_invocation_count(0);)
1228
1229 clear_method_data();
1230 clear_method_counters();
1231 remove_unshareable_flags();
1232 }
1233
1234 void Method::remove_unshareable_flags() {
1235 // clear all the flags that shouldn't be in the archived version
1236 assert(!is_old(), "must be");
1237 assert(!is_obsolete(), "must be");
1238 assert(!is_deleted(), "must be");
1239
1240 set_is_prefixed_native(false);
1241 set_queued_for_compilation(false);
1242 set_is_not_c2_compilable(false);
1243 set_is_not_c1_compilable(false);
1244 set_is_not_c2_osr_compilable(false);
1245 set_on_stack_flag(false);
1246 }
1247 #endif
1248
1249 // Called when the method_holder is getting linked. Setup entrypoints so the method
1250 // is ready to be called from interpreter, compiler, and vtables.
1251 void Method::link_method(const methodHandle& h_method, TRAPS) {
1252 // If the code cache is full, we may reenter this function for the
1253 // leftover methods that weren't linked.
1254 if (adapter() != nullptr) {
1255 return;
1256 }
1257 assert( _code == nullptr, "nothing compiled yet" );
1258
1259 // Setup interpreter entrypoint
1260 assert(this == h_method(), "wrong h_method()" );
1261
1262 assert(adapter() == nullptr, "init'd to null");
1263 address entry = Interpreter::entry_for_method(h_method);
1264 assert(entry != nullptr, "interpreter entry must be non-null");
1265 // Sets both _i2i_entry and _from_interpreted_entry
1266 set_interpreter_entry(entry);
1267
1268 // Don't overwrite already registered native entries.
1269 if (is_native() && !has_native_function()) {
1270 set_native_function(
1271 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1272 !native_bind_event_is_interesting);
1273 }
1274 if (InlineTypeReturnedAsFields && returns_inline_type(THREAD) && !has_scalarized_return()) {
1275 set_has_scalarized_return();
1276 }
1277
1278 // Setup compiler entrypoint. This is made eagerly, so we do not need
1279 // special handling of vtables. An alternative is to make adapters more
1280 // lazily by calling make_adapter() from from_compiled_entry() for the
1281 // normal calls. For vtable calls life gets more complicated. When a
1282 // call-site goes mega-morphic we need adapters in all methods which can be
1283 // called from the vtable. We need adapters on such methods that get loaded
1284 // later. Ditto for mega-morphic itable calls. If this proves to be a
1285 // problem we'll make these lazily later.
1286 (void) make_adapters(h_method, CHECK);
1287
1288 // ONLY USE the h_method now as make_adapter may have blocked
1289
1290 if (h_method->is_continuation_native_intrinsic()) {
1291 // the entry points to this method will be set in set_code, called when first resolving this method
1292 _from_interpreted_entry = nullptr;
1293 _from_compiled_entry = nullptr;
1294 _i2i_entry = nullptr;
1295 }
1296 }
1297
1298 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1299 // Adapters for compiled code are made eagerly here. They are fairly
1300 // small (generally < 100 bytes) and quick to make (and cached and shared)
1301 // so making them eagerly shouldn't be too expensive.
1302 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1303 if (adapter == nullptr ) {
1304 if (!is_init_completed()) {
1305 // Don't throw exceptions during VM initialization because java.lang.* classes
1306 // might not have been initialized, causing problems when constructing the
1307 // Java exception object.
1308 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1309 } else {
1310 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1311 }
1312 }
1313
1314 mh->set_adapter_entry(adapter);
1315 mh->_from_compiled_entry = adapter->get_c2i_entry();
1316 mh->_from_compiled_inline_entry = adapter->get_c2i_inline_entry();
1317 mh->_from_compiled_inline_ro_entry = adapter->get_c2i_inline_ro_entry();
1318 return adapter->get_c2i_entry();
1319 }
1320
1321 // The verified_code_entry() must be called when a invoke is resolved
1322 // on this method.
1323
1324 // It returns the compiled code entry point, after asserting not null.
1325 // This function is called after potential safepoints so that nmethod
1326 // or adapter that it points to is still live and valid.
1327 // This function must not hit a safepoint!
1328 address Method::verified_code_entry() {
1329 debug_only(NoSafepointVerifier nsv;)
1330 assert(_from_compiled_entry != nullptr, "must be set");
1331 return _from_compiled_entry;
1332 }
1333
1334 address Method::verified_inline_code_entry() {
1335 debug_only(NoSafepointVerifier nsv;)
1336 assert(_from_compiled_inline_entry != nullptr, "must be set");
1337 return _from_compiled_inline_entry;
1338 }
1339
1340 address Method::verified_inline_ro_code_entry() {
1341 debug_only(NoSafepointVerifier nsv;)
1342 assert(_from_compiled_inline_ro_entry != nullptr, "must be set");
1343 return _from_compiled_inline_ro_entry;
1344 }
1345
1346 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1347 // (could be racing a deopt).
1348 // Not inline to avoid circular ref.
1349 bool Method::check_code() const {
1350 // cached in a register or local. There's a race on the value of the field.
1351 CompiledMethod *code = Atomic::load_acquire(&_code);
1352 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1353 }
1354
1355 // Install compiled code. Instantly it can execute.
1356 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1357 assert_lock_strong(CompiledMethod_lock);
1358 assert( code, "use clear_code to remove code" );
1359 assert( mh->check_code(), "" );
1360
1361 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1362
1363 // These writes must happen in this order, because the interpreter will
1364 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1365 // which jumps to _from_compiled_entry.
1366 mh->_code = code; // Assign before allowing compiled code to exec
1367
1368 int comp_level = code->comp_level();
1369 // In theory there could be a race here. In practice it is unlikely
1370 // and not worth worrying about.
1371 if (comp_level > mh->highest_comp_level()) {
1372 mh->set_highest_comp_level(comp_level);
1373 }
1374
1375 OrderAccess::storestore();
1376 mh->_from_compiled_entry = code->verified_entry_point();
1377 mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1378 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1379 OrderAccess::storestore();
1380
1381 if (mh->is_continuation_native_intrinsic()) {
1382 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1383
1384 if (mh->is_continuation_enter_intrinsic()) {
1385 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1386 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1387 } else if (mh->is_continuation_yield_intrinsic()) {
1388 mh->_i2i_entry = mh->get_i2c_entry();
1389 } else {
1390 guarantee(false, "Unknown Continuation native intrinsic");
1391 }
1392 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1393 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1394 } else if (!mh->is_method_handle_intrinsic()) {
1395 // Instantly compiled code can execute.
1396 mh->_from_interpreted_entry = mh->get_i2c_entry();
1397 }
1398 }
1399
1400
1401 bool Method::is_overridden_in(Klass* k) const {
1402 InstanceKlass* ik = InstanceKlass::cast(k);
1403
1404 if (ik->is_interface()) return false;
1405
1406 // If method is an interface, we skip it - except if it
1407 // is a miranda method
1408 if (method_holder()->is_interface()) {
1409 // Check that method is not a miranda method
1410 if (ik->lookup_method(name(), signature()) == nullptr) {
1411 // No implementation exist - so miranda method
1412 return false;
1413 }
1414 return true;
1415 }
1416
1417 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1418 if (!has_vtable_index()) {
1419 return false;
1420 } else {
1421 Method* vt_m = ik->method_at_vtable(vtable_index());
1422 return vt_m != this;
1423 }
1424 }
1425
1426
1427 // give advice about whether this Method* should be cached or not
1428 bool Method::should_not_be_cached() const {
1429 if (is_old()) {
1430 // This method has been redefined. It is either EMCP or obsolete
1431 // and we don't want to cache it because that would pin the method
1432 // down and prevent it from being collectible if and when it
1433 // finishes executing.
1434 return true;
1435 }
1436
1437 // caching this method should be just fine
1438 return false;
1439 }
1440
1441
1442 /**
1443 * Returns true if this is one of the specially treated methods for
1444 * security related stack walks (like Reflection.getCallerClass).
1445 */
1446 bool Method::is_ignored_by_security_stack_walk() const {
1447 if (intrinsic_id() == vmIntrinsics::_invoke) {
1448 // This is Method.invoke() -- ignore it
1449 return true;
1450 }
1451 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1452 // This is an auxiliary frame -- ignore it
1453 return true;
1454 }
1455 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1456 // This is an internal adapter frame for method handles -- ignore it
1457 return true;
1458 }
1459 return false;
1460 }
1461
1462
1463 // Constant pool structure for invoke methods:
1464 enum {
1465 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1466 _imcp_invoke_signature, // utf8: (variable Symbol*)
1467 _imcp_limit
1468 };
1469
1470 // Test if this method is an MH adapter frame generated by Java code.
1471 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1472 bool Method::is_compiled_lambda_form() const {
1473 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1474 }
1475
1476 // Test if this method is an internal MH primitive method.
1477 bool Method::is_method_handle_intrinsic() const {
1478 vmIntrinsics::ID iid = intrinsic_id();
1479 return (MethodHandles::is_signature_polymorphic(iid) &&
1480 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1481 }
1482
1483 bool Method::has_member_arg() const {
1484 vmIntrinsics::ID iid = intrinsic_id();
1485 return (MethodHandles::is_signature_polymorphic(iid) &&
1486 MethodHandles::has_member_arg(iid));
1487 }
1488
1489 // Make an instance of a signature-polymorphic internal MH primitive.
1490 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1491 Symbol* signature,
1492 TRAPS) {
1493 ResourceMark rm(THREAD);
1494 methodHandle empty;
1495
1496 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1497 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1498 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1499
1500 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1501
1502 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1503 name->increment_refcount();
1504 signature->increment_refcount();
1505
1506 int cp_length = _imcp_limit;
1507 ClassLoaderData* loader_data = holder->class_loader_data();
1508 constantPoolHandle cp;
1509 {
1510 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1511 cp = constantPoolHandle(THREAD, cp_oop);
1512 }
1513 cp->copy_fields(holder->constants());
1514 cp->set_pool_holder(holder);
1515 cp->symbol_at_put(_imcp_invoke_name, name);
1516 cp->symbol_at_put(_imcp_invoke_signature, signature);
1517 cp->set_has_preresolution();
1518
1519 // decide on access bits: public or not?
1520 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1521 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1522 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1523 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1524
1525 methodHandle m;
1526 {
1527 InlineTableSizes sizes;
1528 Method* m_oop = Method::allocate(loader_data, 0,
1529 accessFlags_from(flags_bits), &sizes,
1530 ConstMethod::NORMAL,
1531 name,
1532 CHECK_(empty));
1533 m = methodHandle(THREAD, m_oop);
1534 }
1535 m->set_constants(cp());
1536 m->set_name_index(_imcp_invoke_name);
1537 m->set_signature_index(_imcp_invoke_signature);
1538 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1539 assert(m->signature() == signature, "");
1540 m->constMethod()->compute_from_signature(signature, must_be_static);
1541 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1542 assert(m->is_method_handle_intrinsic(), "");
1543 #ifdef ASSERT
1544 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1545 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1546 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1547 #endif //ASSERT
1548
1549 // Finally, set up its entry points.
1550 assert(m->can_be_statically_bound(), "");
1551 m->set_vtable_index(Method::nonvirtual_vtable_index);
1552 m->link_method(m, CHECK_(empty));
1553
1554 if (iid == vmIntrinsics::_linkToNative) {
1555 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1556 }
1557 if (log_is_enabled(Debug, methodhandles)) {
1558 LogTarget(Debug, methodhandles) lt;
1559 LogStream ls(lt);
1560 m->print_on(&ls);
1561 }
1562
1563 return m;
1564 }
1565
1566 Klass* Method::check_non_bcp_klass(Klass* klass) {
1567 if (klass != nullptr && klass->class_loader() != nullptr) {
1568 if (klass->is_objArray_klass())
1569 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1570 return klass;
1571 }
1572 return nullptr;
1573 }
1574
1575
1576 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1577 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1578 // Code below does not work for native methods - they should never get rewritten anyway
1579 assert(!m->is_native(), "cannot rewrite native methods");
1580 // Allocate new Method*
1581 AccessFlags flags = m->access_flags();
1582
1583 ConstMethod* cm = m->constMethod();
1584 int checked_exceptions_len = cm->checked_exceptions_length();
1585 int localvariable_len = cm->localvariable_table_length();
1586 int exception_table_len = cm->exception_table_length();
1587 int method_parameters_len = cm->method_parameters_length();
1588 int method_annotations_len = cm->method_annotations_length();
1589 int parameter_annotations_len = cm->parameter_annotations_length();
1590 int type_annotations_len = cm->type_annotations_length();
1591 int default_annotations_len = cm->default_annotations_length();
1592
1593 InlineTableSizes sizes(
1594 localvariable_len,
1595 new_compressed_linenumber_size,
1596 exception_table_len,
1597 checked_exceptions_len,
1598 method_parameters_len,
1599 cm->generic_signature_index(),
1600 method_annotations_len,
1601 parameter_annotations_len,
1602 type_annotations_len,
1603 default_annotations_len,
1604 0);
1605
1606 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1607 Method* newm_oop = Method::allocate(loader_data,
1608 new_code_length,
1609 flags,
1610 &sizes,
1611 m->method_type(),
1612 m->name(),
1613 CHECK_(methodHandle()));
1614 methodHandle newm (THREAD, newm_oop);
1615
1616 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1617 ConstMethod* newcm = newm->constMethod();
1618 int new_const_method_size = newm->constMethod()->size();
1619
1620 // This works because the source and target are both Methods. Some compilers
1621 // (e.g., clang) complain that the target vtable pointer will be stomped,
1622 // so cast away newm()'s and m()'s Methodness.
1623 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1624
1625 // Create shallow copy of ConstMethod.
1626 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1627
1628 // Reset correct method/const method, method size, and parameter info
1629 newm->set_constMethod(newcm);
1630 newm->constMethod()->set_code_size(new_code_length);
1631 newm->constMethod()->set_constMethod_size(new_const_method_size);
1632 assert(newm->code_size() == new_code_length, "check");
1633 assert(newm->method_parameters_length() == method_parameters_len, "check");
1634 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1635 assert(newm->exception_table_length() == exception_table_len, "check");
1636 assert(newm->localvariable_table_length() == localvariable_len, "check");
1637 // Copy new byte codes
1638 memcpy(newm->code_base(), new_code, new_code_length);
1639 // Copy line number table
1640 if (new_compressed_linenumber_size > 0) {
1641 memcpy(newm->compressed_linenumber_table(),
1642 new_compressed_linenumber_table,
1643 new_compressed_linenumber_size);
1644 }
1645 // Copy method_parameters
1646 if (method_parameters_len > 0) {
1647 memcpy(newm->method_parameters_start(),
1648 m->method_parameters_start(),
1649 method_parameters_len * sizeof(MethodParametersElement));
1650 }
1651 // Copy checked_exceptions
1652 if (checked_exceptions_len > 0) {
1653 memcpy(newm->checked_exceptions_start(),
1654 m->checked_exceptions_start(),
1655 checked_exceptions_len * sizeof(CheckedExceptionElement));
1656 }
1657 // Copy exception table
1658 if (exception_table_len > 0) {
1659 memcpy(newm->exception_table_start(),
1660 m->exception_table_start(),
1661 exception_table_len * sizeof(ExceptionTableElement));
1662 }
1663 // Copy local variable number table
1664 if (localvariable_len > 0) {
1665 memcpy(newm->localvariable_table_start(),
1666 m->localvariable_table_start(),
1667 localvariable_len * sizeof(LocalVariableTableElement));
1668 }
1669 // Copy stackmap table
1670 if (m->has_stackmap_table()) {
1671 int code_attribute_length = m->stackmap_data()->length();
1672 Array<u1>* stackmap_data =
1673 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1674 memcpy((void*)stackmap_data->adr_at(0),
1675 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1676 newm->set_stackmap_data(stackmap_data);
1677 }
1678
1679 // copy annotations over to new method
1680 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1681 return newm;
1682 }
1683
1684 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1685 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1686 // because we are not loading from core libraries
1687 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1688 // which does not use the class default class loader so we check for its loader here
1689 const InstanceKlass* ik = InstanceKlass::cast(holder);
1690 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1691 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1692 }
1693
1694 // see if the klass name is well-known:
1695 Symbol* klass_name = ik->name();
1696 vmSymbolID id = vmSymbols::find_sid(klass_name);
1697 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1698 return id;
1699 } else {
1700 return vmSymbolID::NO_SID;
1701 }
1702 }
1703
1704 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1705 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1706 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1707 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1708 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1709
1710 // the klass name is well-known:
1711 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1712 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1713
1714 // ditto for method and signature:
1715 vmSymbolID name_id = vmSymbols::find_sid(name());
1716 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1717 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1718 && name_id == vmSymbolID::NO_SID) {
1719 return;
1720 }
1721 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1722 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1723 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1724 && sig_id == vmSymbolID::NO_SID) {
1725 return;
1726 }
1727 jshort flags = access_flags().as_short();
1728
1729 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1730 if (id != vmIntrinsics::_none) {
1731 set_intrinsic_id(id);
1732 if (id == vmIntrinsics::_Class_cast) {
1733 // Even if the intrinsic is rejected, we want to inline this simple method.
1734 set_force_inline();
1735 }
1736 return;
1737 }
1738
1739 // A few slightly irregular cases:
1740 switch (klass_id) {
1741 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1742 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1743 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1744 if (!is_native()) break;
1745 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1746 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1747 id = vmIntrinsics::_none;
1748 break;
1749
1750 default:
1751 break;
1752 }
1753
1754 if (id != vmIntrinsics::_none) {
1755 // Set up its iid. It is an alias method.
1756 set_intrinsic_id(id);
1757 return;
1758 }
1759 }
1760
1761 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1762 if (!THREAD->can_call_java()) {
1763 // There is nothing useful this routine can do from within the Compile thread.
1764 // Hopefully, the signature contains only well-known classes.
1765 // We could scan for this and return true/false, but the caller won't care.
1766 return false;
1767 }
1768 bool sig_is_loaded = true;
1769 ResourceMark rm(THREAD);
1770 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1771 if (ss.is_reference()) {
1772 // load everything, including arrays "[Lfoo;"
1773 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1774 // We are loading classes eagerly. If a ClassNotFoundException or
1775 // a LinkageError was generated, be sure to ignore it.
1776 if (HAS_PENDING_EXCEPTION) {
1777 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1778 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1779 CLEAR_PENDING_EXCEPTION;
1780 } else {
1781 return false;
1782 }
1783 }
1784 if( klass == nullptr) { sig_is_loaded = false; }
1785 }
1786 }
1787 return sig_is_loaded;
1788 }
1789
1790 // Exposed so field engineers can debug VM
1791 void Method::print_short_name(outputStream* st) const {
1792 ResourceMark rm;
1793 #ifdef PRODUCT
1794 st->print(" %s::", method_holder()->external_name());
1795 #else
1796 st->print(" %s::", method_holder()->internal_name());
1797 #endif
1798 name()->print_symbol_on(st);
1799 if (WizardMode) signature()->print_symbol_on(st);
1800 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1801 MethodHandles::print_as_basic_type_signature_on(st, signature());
1802 }
1803
1804 // Comparer for sorting an object array containing
1805 // Method*s.
1806 static int method_comparator(Method* a, Method* b) {
1807 return a->name()->fast_compare(b->name());
1808 }
1809
1810 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1811 // default_methods also uses this without the ordering for fast find_method
1812 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1813 int length = methods->length();
1814 if (length > 1) {
1815 if (func == nullptr) {
1816 func = method_comparator;
1817 }
1818 {
1819 NoSafepointVerifier nsv;
1820 QuickSort::sort(methods->data(), length, func, /*idempotent=*/false);
1821 }
1822 // Reset method ordering
1823 if (set_idnums) {
1824 for (u2 i = 0; i < length; i++) {
1825 Method* m = methods->at(i);
1826 m->set_method_idnum(i);
1827 m->set_orig_method_idnum(i);
1828 }
1829 }
1830 }
1831 }
1832
1833 //-----------------------------------------------------------------------------------
1834 // Non-product code unless JVM/TI needs it
1835
1836 #if !defined(PRODUCT) || INCLUDE_JVMTI
1837 class SignatureTypePrinter : public SignatureTypeNames {
1838 private:
1839 outputStream* _st;
1840 bool _use_separator;
1841
1842 void type_name(const char* name) {
1843 if (_use_separator) _st->print(", ");
1844 _st->print("%s", name);
1845 _use_separator = true;
1846 }
1847
1848 public:
1849 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1850 _st = st;
1851 _use_separator = false;
1852 }
1853
1854 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1855 void print_returntype() { _use_separator = false; do_type(return_type()); }
1856 };
1857
1858
1859 void Method::print_name(outputStream* st) const {
1860 Thread *thread = Thread::current();
1861 ResourceMark rm(thread);
1862 st->print("%s ", is_static() ? "static" : "virtual");
1863 if (WizardMode) {
1864 st->print("%s.", method_holder()->internal_name());
1865 name()->print_symbol_on(st);
1866 signature()->print_symbol_on(st);
1867 } else {
1868 SignatureTypePrinter sig(signature(), st);
1869 sig.print_returntype();
1870 st->print(" %s.", method_holder()->internal_name());
1871 name()->print_symbol_on(st);
1872 st->print("(");
1873 sig.print_parameters();
1874 st->print(")");
1875 }
1876 }
1877 #endif // !PRODUCT || INCLUDE_JVMTI
1878
1879
1880 void Method::print_codes_on(outputStream* st, int flags) const {
1881 print_codes_on(0, code_size(), st, flags);
1882 }
1883
1884 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1885 Thread *thread = Thread::current();
1886 ResourceMark rm(thread);
1887 methodHandle mh (thread, (Method*)this);
1888 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1889 }
1890
1891 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1892 _bci = 0;
1893 _line = 0;
1894 };
1895
1896 bool CompressedLineNumberReadStream::read_pair() {
1897 jubyte next = read_byte();
1898 // Check for terminator
1899 if (next == 0) return false;
1900 if (next == 0xFF) {
1901 // Escape character, regular compression used
1902 _bci += read_signed_int();
1903 _line += read_signed_int();
1904 } else {
1905 // Single byte compression used
1906 _bci += next >> 3;
1907 _line += next & 0x7;
1908 }
1909 return true;
1910 }
1911
1912 #if INCLUDE_JVMTI
1913
1914 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1915 BreakpointInfo* bp = method_holder()->breakpoints();
1916 for (; bp != nullptr; bp = bp->next()) {
1917 if (bp->match(this, bci)) {
1918 return bp->orig_bytecode();
1919 }
1920 }
1921 {
1922 ResourceMark rm;
1923 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1924 }
1925 return Bytecodes::_shouldnotreachhere;
1926 }
1927
1928 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1929 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1930 BreakpointInfo* bp = method_holder()->breakpoints();
1931 for (; bp != nullptr; bp = bp->next()) {
1932 if (bp->match(this, bci)) {
1933 bp->set_orig_bytecode(code);
1934 // and continue, in case there is more than one
1935 }
1936 }
1937 }
1938
1939 void Method::set_breakpoint(int bci) {
1940 InstanceKlass* ik = method_holder();
1941 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1942 bp->set_next(ik->breakpoints());
1943 ik->set_breakpoints(bp);
1944 // do this last:
1945 bp->set(this);
1946 }
1947
1948 static void clear_matches(Method* m, int bci) {
1949 InstanceKlass* ik = m->method_holder();
1950 BreakpointInfo* prev_bp = nullptr;
1951 BreakpointInfo* next_bp;
1952 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1953 next_bp = bp->next();
1954 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1955 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1956 // do this first:
1957 bp->clear(m);
1958 // unhook it
1959 if (prev_bp != nullptr)
1960 prev_bp->set_next(next_bp);
1961 else
1962 ik->set_breakpoints(next_bp);
1963 delete bp;
1964 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1965 // at same location. So we have multiple matching (method_index and bci)
1966 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1967 // breakpoint for clear_breakpoint request and keep all other method versions
1968 // BreakpointInfo for future clear_breakpoint request.
1969 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1970 // which is being called when class is unloaded. We delete all the Breakpoint
1971 // information for all versions of method. We may not correctly restore the original
1972 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1973 // so these methods won't be used anymore.
1974 if (bci >= 0) {
1975 break;
1976 }
1977 } else {
1978 // This one is a keeper.
1979 prev_bp = bp;
1980 }
1981 }
1982 }
1983
1984 void Method::clear_breakpoint(int bci) {
1985 assert(bci >= 0, "");
1986 clear_matches(this, bci);
1987 }
1988
1989 void Method::clear_all_breakpoints() {
1990 clear_matches(this, -1);
1991 }
1992
1993 #endif // INCLUDE_JVMTI
1994
1995 int Method::invocation_count() const {
1996 MethodCounters* mcs = method_counters();
1997 MethodData* mdo = method_data();
1998 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) ||
1999 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) {
2000 return InvocationCounter::count_limit;
2001 } else {
2002 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) +
2003 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0);
2004 }
2005 }
2006
2007 int Method::backedge_count() const {
2008 MethodCounters* mcs = method_counters();
2009 MethodData* mdo = method_data();
2010 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) ||
2011 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) {
2012 return InvocationCounter::count_limit;
2013 } else {
2014 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) +
2015 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0);
2016 }
2017 }
2018
2019 int Method::highest_comp_level() const {
2020 const MethodCounters* mcs = method_counters();
2021 if (mcs != nullptr) {
2022 return mcs->highest_comp_level();
2023 } else {
2024 return CompLevel_none;
2025 }
2026 }
2027
2028 int Method::highest_osr_comp_level() const {
2029 const MethodCounters* mcs = method_counters();
2030 if (mcs != nullptr) {
2031 return mcs->highest_osr_comp_level();
2032 } else {
2033 return CompLevel_none;
2034 }
2035 }
2036
2037 void Method::set_highest_comp_level(int level) {
2038 MethodCounters* mcs = method_counters();
2039 if (mcs != nullptr) {
2040 mcs->set_highest_comp_level(level);
2041 }
2042 }
2043
2044 void Method::set_highest_osr_comp_level(int level) {
2045 MethodCounters* mcs = method_counters();
2046 if (mcs != nullptr) {
2047 mcs->set_highest_osr_comp_level(level);
2048 }
2049 }
2050
2051 #if INCLUDE_JVMTI
2052
2053 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2054 _bci = bci;
2055 _name_index = m->name_index();
2056 _signature_index = m->signature_index();
2057 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2058 if (_orig_bytecode == Bytecodes::_breakpoint)
2059 _orig_bytecode = m->orig_bytecode_at(_bci);
2060 _next = nullptr;
2061 }
2062
2063 void BreakpointInfo::set(Method* method) {
2064 #ifdef ASSERT
2065 {
2066 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2067 if (code == Bytecodes::_breakpoint)
2068 code = method->orig_bytecode_at(_bci);
2069 assert(orig_bytecode() == code, "original bytecode must be the same");
2070 }
2071 #endif
2072 Thread *thread = Thread::current();
2073 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2074 method->incr_number_of_breakpoints(thread);
2075 {
2076 // Deoptimize all dependents on this method
2077 HandleMark hm(thread);
2078 methodHandle mh(thread, method);
2079 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2080 }
2081 }
2082
2083 void BreakpointInfo::clear(Method* method) {
2084 *method->bcp_from(_bci) = orig_bytecode();
2085 assert(method->number_of_breakpoints() > 0, "must not go negative");
2086 method->decr_number_of_breakpoints(Thread::current());
2087 }
2088
2089 #endif // INCLUDE_JVMTI
2090
2091 // jmethodID handling
2092
2093 // This is a block allocating object, sort of like JNIHandleBlock, only a
2094 // lot simpler.
2095 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2096 // never get rid of it.
2097
2098 static const int min_block_size = 8;
2099
2100 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2101 friend class JNIMethodBlock;
2102 Method** _methods;
2103 int _number_of_methods;
2104 int _top;
2105 JNIMethodBlockNode* _next;
2106
2107 public:
2108
2109 JNIMethodBlockNode(int num_methods = min_block_size);
2110
2111 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2112
2113 void ensure_methods(int num_addl_methods) {
2114 if (_top < _number_of_methods) {
2115 num_addl_methods -= _number_of_methods - _top;
2116 if (num_addl_methods <= 0) {
2117 return;
2118 }
2119 }
2120 if (_next == nullptr) {
2121 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2122 } else {
2123 _next->ensure_methods(num_addl_methods);
2124 }
2125 }
2126 };
2127
2128 class JNIMethodBlock : public CHeapObj<mtClass> {
2129 JNIMethodBlockNode _head;
2130 JNIMethodBlockNode *_last_free;
2131 public:
2132 static Method* const _free_method;
2133
2134 JNIMethodBlock(int initial_capacity = min_block_size)
2135 : _head(initial_capacity), _last_free(&_head) {}
2136
2137 void ensure_methods(int num_addl_methods) {
2138 _last_free->ensure_methods(num_addl_methods);
2139 }
2140
2141 Method** add_method(Method* m) {
2142 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2143 if (b->_top < b->_number_of_methods) {
2144 // top points to the next free entry.
2145 int i = b->_top;
2146 b->_methods[i] = m;
2147 b->_top++;
2148 _last_free = b;
2149 return &(b->_methods[i]);
2150 } else if (b->_top == b->_number_of_methods) {
2151 // if the next free entry ran off the block see if there's a free entry
2152 for (int i = 0; i < b->_number_of_methods; i++) {
2153 if (b->_methods[i] == _free_method) {
2154 b->_methods[i] = m;
2155 _last_free = b;
2156 return &(b->_methods[i]);
2157 }
2158 }
2159 // Only check each block once for frees. They're very unlikely.
2160 // Increment top past the end of the block.
2161 b->_top++;
2162 }
2163 // need to allocate a next block.
2164 if (b->_next == nullptr) {
2165 b->_next = _last_free = new JNIMethodBlockNode();
2166 }
2167 }
2168 guarantee(false, "Should always allocate a free block");
2169 return nullptr;
2170 }
2171
2172 bool contains(Method** m) {
2173 if (m == nullptr) return false;
2174 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2175 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2176 // This is a bit of extra checking, for two reasons. One is
2177 // that contains() deals with pointers that are passed in by
2178 // JNI code, so making sure that the pointer is aligned
2179 // correctly is valuable. The other is that <= and > are
2180 // technically not defined on pointers, so the if guard can
2181 // pass spuriously; no modern compiler is likely to make that
2182 // a problem, though (and if one did, the guard could also
2183 // fail spuriously, which would be bad).
2184 ptrdiff_t idx = m - b->_methods;
2185 if (b->_methods + idx == m) {
2186 return true;
2187 }
2188 }
2189 }
2190 return false; // not found
2191 }
2192
2193 // Doesn't really destroy it, just marks it as free so it can be reused.
2194 void destroy_method(Method** m) {
2195 #ifdef ASSERT
2196 assert(contains(m), "should be a methodID");
2197 #endif // ASSERT
2198 *m = _free_method;
2199 }
2200
2201 // During class unloading the methods are cleared, which is different
2202 // than freed.
2203 void clear_all_methods() {
2204 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2205 for (int i = 0; i< b->_number_of_methods; i++) {
2206 b->_methods[i] = nullptr;
2207 }
2208 }
2209 }
2210 #ifndef PRODUCT
2211 int count_methods() {
2212 // count all allocated methods
2213 int count = 0;
2214 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2215 for (int i = 0; i< b->_number_of_methods; i++) {
2216 if (b->_methods[i] != _free_method) count++;
2217 }
2218 }
2219 return count;
2220 }
2221 #endif // PRODUCT
2222 };
2223
2224 // Something that can't be mistaken for an address or a markWord
2225 Method* const JNIMethodBlock::_free_method = (Method*)55;
2226
2227 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2228 _number_of_methods = MAX2(num_methods, min_block_size);
2229 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2230 for (int i = 0; i < _number_of_methods; i++) {
2231 _methods[i] = JNIMethodBlock::_free_method;
2232 }
2233 }
2234
2235 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2236 // Have to add jmethod_ids() to class loader data thread-safely.
2237 // Also have to add the method to the list safely, which the lock
2238 // protects as well.
2239 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2240 if (cld->jmethod_ids() == nullptr) {
2241 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2242 } else {
2243 cld->jmethod_ids()->ensure_methods(capacity);
2244 }
2245 }
2246
2247 // Add a method id to the jmethod_ids
2248 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
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 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2253 if (cld->jmethod_ids() == nullptr) {
2254 cld->set_jmethod_ids(new JNIMethodBlock());
2255 }
2256 // jmethodID is a pointer to Method*
2257 return (jmethodID)cld->jmethod_ids()->add_method(m);
2258 }
2259
2260 jmethodID Method::jmethod_id() {
2261 methodHandle mh(Thread::current(), this);
2262 return method_holder()->get_jmethod_id(mh);
2263 }
2264
2265 // Mark a jmethodID as free. This is called when there is a data race in
2266 // InstanceKlass while creating the jmethodID cache.
2267 void Method::destroy_jmethod_id(ClassLoaderData* cld, jmethodID m) {
2268 Method** ptr = (Method**)m;
2269 assert(cld->jmethod_ids() != nullptr, "should have method handles");
2270 cld->jmethod_ids()->destroy_method(ptr);
2271 }
2272
2273 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2274 // Can't assert the method_holder is the same because the new method has the
2275 // scratch method holder.
2276 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2277 == new_method->method_holder()->class_loader() ||
2278 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2279 "changing to a different class loader");
2280 // Just change the method in place, jmethodID pointer doesn't change.
2281 *((Method**)jmid) = new_method;
2282 }
2283
2284 bool Method::is_method_id(jmethodID mid) {
2285 Method* m = resolve_jmethod_id(mid);
2286 assert(m != nullptr, "should be called with non-null method");
2287 InstanceKlass* ik = m->method_holder();
2288 ClassLoaderData* cld = ik->class_loader_data();
2289 if (cld->jmethod_ids() == nullptr) return false;
2290 return (cld->jmethod_ids()->contains((Method**)mid));
2291 }
2292
2293 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2294 if (mid == nullptr) return nullptr;
2295 Method* o = resolve_jmethod_id(mid);
2296 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2297 return nullptr;
2298 }
2299 // Method should otherwise be valid. Assert for testing.
2300 assert(is_valid_method(o), "should be valid jmethodid");
2301 // If the method's class holder object is unreferenced, but not yet marked as
2302 // unloaded, we need to return null here too because after a safepoint, its memory
2303 // will be reclaimed.
2304 return o->method_holder()->is_loader_alive() ? o : nullptr;
2305 };
2306
2307 void Method::set_on_stack(const bool value) {
2308 // Set both the method itself and its constant pool. The constant pool
2309 // on stack means some method referring to it is also on the stack.
2310 constants()->set_on_stack(value);
2311
2312 bool already_set = on_stack_flag();
2313 set_on_stack_flag(value);
2314 if (value && !already_set) {
2315 MetadataOnStackMark::record(this);
2316 }
2317 }
2318
2319 void Method::record_gc_epoch() {
2320 // If any method is on the stack in continuations, none of them can be reclaimed,
2321 // so save the marking cycle to check for the whole class in the cpCache.
2322 // The cpCache is writeable.
2323 constants()->cache()->record_gc_epoch();
2324 }
2325
2326 // Called when the class loader is unloaded to make all methods weak.
2327 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2328 loader_data->jmethod_ids()->clear_all_methods();
2329 }
2330
2331 void Method::clear_jmethod_id() {
2332 // Being at a safepoint prevents racing against other class redefinitions
2333 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2334 // The jmethodID is not stored in the Method instance, we need to look it up first
2335 jmethodID methodid = find_jmethod_id_or_null();
2336 // We need to make sure that jmethodID actually resolves to this method
2337 // - multiple redefined versions may share jmethodID slots and if a method
2338 // has already been rewired to a newer version we could be removing reference
2339 // to a still existing method instance
2340 if (methodid != nullptr && *((Method**)methodid) == this) {
2341 *((Method**)methodid) = nullptr;
2342 }
2343 }
2344
2345 bool Method::has_method_vptr(const void* ptr) {
2346 Method m;
2347 // This assumes that the vtbl pointer is the first word of a C++ object.
2348 return dereference_vptr(&m) == dereference_vptr(ptr);
2349 }
2350
2351 // Check that this pointer is valid by checking that the vtbl pointer matches
2352 bool Method::is_valid_method(const Method* m) {
2353 if (m == nullptr) {
2354 return false;
2355 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2356 // Quick sanity check on pointer.
2357 return false;
2358 } else if (!os::is_readable_range(m, m + 1)) {
2359 return false;
2360 } else if (m->is_shared()) {
2361 return CppVtables::is_valid_shared_method(m);
2362 } else if (Metaspace::contains_non_shared(m)) {
2363 return has_method_vptr((const void*)m);
2364 } else {
2365 return false;
2366 }
2367 }
2368
2369 bool Method::is_scalarized_arg(int idx) const {
2370 if (!has_scalarized_args()) {
2371 return false;
2372 }
2373 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID
2374 int depth = 0;
2375 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2376 for (int i = 0; i < sig->length(); i++) {
2377 BasicType bt = sig->at(i)._bt;
2378 if (bt == T_METADATA) {
2379 depth++;
2380 }
2381 if (idx == 0) {
2382 break; // Argument found
2383 }
2384 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2385 depth--;
2386 }
2387 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2388 idx--; // Advance to next argument
2389 }
2390 }
2391 return depth != 0;
2392 }
2393
2394 #ifndef PRODUCT
2395 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2396 out->print("%d", loader_data->jmethod_ids()->count_methods());
2397 }
2398 #endif // PRODUCT
2399
2400
2401 // Printing
2402
2403 #ifndef PRODUCT
2404
2405 void Method::print_on(outputStream* st) const {
2406 ResourceMark rm;
2407 assert(is_method(), "must be method");
2408 st->print_cr("%s", internal_name());
2409 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2410 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2411 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2412 constants()->print_value_on(st); st->cr();
2413 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2414 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2415 st->print (" - name: "); name()->print_value_on(st); st->cr();
2416 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2417 st->print_cr(" - max stack: %d", max_stack());
2418 st->print_cr(" - max locals: %d", max_locals());
2419 st->print_cr(" - size of params: %d", size_of_parameters());
2420 st->print_cr(" - method size: %d", method_size());
2421 if (intrinsic_id() != vmIntrinsics::_none)
2422 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2423 if (highest_comp_level() != CompLevel_none)
2424 st->print_cr(" - highest level: %d", highest_comp_level());
2425 st->print_cr(" - vtable index: %d", _vtable_index);
2426 #ifdef ASSERT
2427 if (valid_itable_index())
2428 st->print_cr(" - itable index: %d", itable_index());
2429 #endif
2430 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2431 st->print( " - adapters: ");
2432 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2433 if (a == nullptr)
2434 st->print_cr(PTR_FORMAT, p2i(a));
2435 else
2436 a->print_adapter_on(st);
2437 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2438 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2439 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry()));
2440 st->print_cr(" - code size: %d", code_size());
2441 if (code_size() != 0) {
2442 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2443 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2444 }
2445 if (method_data() != nullptr) {
2446 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2447 }
2448 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2449 if (checked_exceptions_length() > 0) {
2450 CheckedExceptionElement* table = checked_exceptions_start();
2451 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2452 if (Verbose) {
2453 for (int i = 0; i < checked_exceptions_length(); i++) {
2454 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2455 }
2456 }
2457 }
2458 if (has_linenumber_table()) {
2459 u_char* table = compressed_linenumber_table();
2460 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2461 if (Verbose) {
2462 CompressedLineNumberReadStream stream(table);
2463 while (stream.read_pair()) {
2464 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2465 }
2466 }
2467 }
2468 st->print_cr(" - localvar length: %d", localvariable_table_length());
2469 if (localvariable_table_length() > 0) {
2470 LocalVariableTableElement* table = localvariable_table_start();
2471 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2472 if (Verbose) {
2473 for (int i = 0; i < localvariable_table_length(); i++) {
2474 int bci = table[i].start_bci;
2475 int len = table[i].length;
2476 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2477 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2478 int slot = table[i].slot;
2479 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2480 }
2481 }
2482 }
2483 if (code() != nullptr) {
2484 st->print (" - compiled code: ");
2485 code()->print_value_on(st);
2486 }
2487 if (is_native()) {
2488 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2489 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2490 }
2491 }
2492
2493 void Method::print_linkage_flags(outputStream* st) {
2494 access_flags().print_on(st);
2495 if (is_default_method()) {
2496 st->print("default ");
2497 }
2498 if (is_overpass()) {
2499 st->print("overpass ");
2500 }
2501 }
2502 #endif //PRODUCT
2503
2504 void Method::print_value_on(outputStream* st) const {
2505 assert(is_method(), "must be method");
2506 st->print("%s", internal_name());
2507 print_address_on(st);
2508 st->print(" ");
2509 if (WizardMode) access_flags().print_on(st);
2510 name()->print_value_on(st);
2511 st->print(" ");
2512 signature()->print_value_on(st);
2513 st->print(" in ");
2514 method_holder()->print_value_on(st);
2515 if (WizardMode) st->print("#%d", _vtable_index);
2516 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2517 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2518 }
2519
2520 // Verification
2521
2522 void Method::verify_on(outputStream* st) {
2523 guarantee(is_method(), "object must be method");
2524 guarantee(constants()->is_constantPool(), "should be constant pool");
2525 MethodData* md = method_data();
2526 guarantee(md == nullptr ||
2527 md->is_methodData(), "should be method data");
2528 }