1 /*
2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cppVtables.hpp"
27 #include "cds/metaspaceShared.hpp"
28 #include "classfile/classLoaderDataGraph.hpp"
29 #include "classfile/metadataOnStackMark.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/debugInfoRec.hpp"
35 #include "compiler/compilationPolicy.hpp"
36 #include "gc/shared/collectedHeap.inline.hpp"
37 #include "interpreter/bytecodeStream.hpp"
38 #include "interpreter/bytecodeTracer.hpp"
39 #include "interpreter/bytecodes.hpp"
40 #include "interpreter/interpreter.hpp"
41 #include "interpreter/oopMapCache.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logTag.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/metaspaceClosure.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/constMethod.hpp"
52 #include "oops/constantPool.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/method.inline.hpp"
55 #include "oops/methodData.hpp"
56 #include "oops/objArrayKlass.hpp"
57 #include "oops/objArrayOop.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/symbol.hpp"
60 #include "oops/inlineKlass.inline.hpp"
61 #include "prims/jvmtiExport.hpp"
62 #include "prims/methodHandles.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/atomic.hpp"
65 #include "runtime/continuationEntry.hpp"
66 #include "runtime/frame.inline.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/init.hpp"
69 #include "runtime/orderAccess.hpp"
70 #include "runtime/relocator.hpp"
71 #include "runtime/safepointVerifiers.hpp"
72 #include "runtime/sharedRuntime.hpp"
73 #include "runtime/signature.hpp"
74 #include "runtime/vm_version.hpp"
75 #include "services/memTracker.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/quickSort.hpp"
78 #include "utilities/vmError.hpp"
79 #include "utilities/xmlstream.hpp"
80
81 // Implementation of Method
82
83 Method* Method::allocate(ClassLoaderData* loader_data,
84 int byte_code_size,
85 AccessFlags access_flags,
86 InlineTableSizes* sizes,
87 ConstMethod::MethodType method_type,
88 Symbol* name,
89 TRAPS) {
90 assert(!access_flags.is_native() || byte_code_size == 0,
91 "native methods should not contain byte codes");
92 ConstMethod* cm = ConstMethod::allocate(loader_data,
93 byte_code_size,
94 sizes,
95 method_type,
96 CHECK_NULL);
97 int size = Method::size(access_flags.is_native());
98 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
99 }
100
101 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
102 NoSafepointVerifier no_safepoint;
103 set_constMethod(xconst);
104 set_access_flags(access_flags);
105 set_intrinsic_id(vmIntrinsics::_none);
106 set_method_data(nullptr);
107 clear_method_counters();
108 set_vtable_index(Method::garbage_vtable_index);
109
110 // Fix and bury in Method*
111 set_interpreter_entry(nullptr); // sets i2i entry and from_int
112 set_adapter_entry(nullptr);
113 Method::clear_code(); // from_c/from_i get set to c2i/i2i
114
115 if (access_flags.is_native()) {
116 clear_native_function();
117 set_signature_handler(nullptr);
118 }
119 NOT_PRODUCT(set_compiled_invocation_count(0);)
120 // Name is very useful for debugging.
121 NOT_PRODUCT(_name = name;)
122 }
123
124 // Release Method*. The nmethod will be gone when we get here because
125 // we've walked the code cache.
126 void Method::deallocate_contents(ClassLoaderData* loader_data) {
127 MetadataFactory::free_metadata(loader_data, constMethod());
128 set_constMethod(nullptr);
129 MetadataFactory::free_metadata(loader_data, method_data());
130 set_method_data(nullptr);
131 MetadataFactory::free_metadata(loader_data, method_counters());
132 clear_method_counters();
133 // The nmethod will be gone when we get here.
134 if (code() != nullptr) _code = nullptr;
135 }
136
137 void Method::release_C_heap_structures() {
138 if (method_data()) {
139 method_data()->release_C_heap_structures();
140
141 // Destroy MethodData embedded lock
142 method_data()->~MethodData();
143 }
144 }
145
146 address Method::get_i2c_entry() {
147 assert(adapter() != nullptr, "must have");
148 return adapter()->get_i2c_entry();
149 }
150
151 address Method::get_c2i_entry() {
152 assert(adapter() != nullptr, "must have");
153 return adapter()->get_c2i_entry();
154 }
155
156 address Method::get_c2i_inline_entry() {
157 assert(adapter() != nullptr, "must have");
158 return adapter()->get_c2i_inline_entry();
159 }
160
161 address Method::get_c2i_unverified_entry() {
162 assert(adapter() != nullptr, "must have");
163 return adapter()->get_c2i_unverified_entry();
164 }
165
166 address Method::get_c2i_unverified_inline_entry() {
167 assert(adapter() != nullptr, "must have");
168 return adapter()->get_c2i_unverified_inline_entry();
169 }
170
171 address Method::get_c2i_no_clinit_check_entry() {
172 assert(VM_Version::supports_fast_class_init_checks(), "");
173 assert(adapter() != nullptr, "must have");
174 return adapter()->get_c2i_no_clinit_check_entry();
175 }
176
177 char* Method::name_and_sig_as_C_string() const {
178 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
179 }
180
181 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
182 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
183 }
184
185 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
186 const char* klass_name = klass->external_name();
187 int klass_name_len = (int)strlen(klass_name);
188 int method_name_len = method_name->utf8_length();
189 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
190 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
191 strcpy(dest, klass_name);
192 dest[klass_name_len] = '.';
193 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
194 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
195 dest[len] = 0;
196 return dest;
197 }
198
199 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
200 Symbol* klass_name = klass->name();
201 klass_name->as_klass_external_name(buf, size);
202 int len = (int)strlen(buf);
203
204 if (len < size - 1) {
205 buf[len++] = '.';
206
207 method_name->as_C_string(&(buf[len]), size - len);
208 len = (int)strlen(buf);
209
210 signature->as_C_string(&(buf[len]), size - len);
211 }
212
213 return buf;
214 }
215
216 const char* Method::external_name() const {
217 return external_name(constants()->pool_holder(), name(), signature());
218 }
219
220 void Method::print_external_name(outputStream *os) const {
221 print_external_name(os, constants()->pool_holder(), name(), signature());
222 }
223
224 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
225 stringStream ss;
226 print_external_name(&ss, klass, method_name, signature);
227 return ss.as_string();
228 }
229
230 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
231 signature->print_as_signature_external_return_type(os);
232 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
233 signature->print_as_signature_external_parameters(os);
234 os->print(")");
235 }
236
237 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
238 if (log_is_enabled(Debug, exceptions)) {
239 ResourceMark rm(THREAD);
240 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
241 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
242 }
243 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
244 // access exception table
245 ExceptionTable table(mh());
246 int length = table.length();
247 // iterate through all entries sequentially
248 constantPoolHandle pool(THREAD, mh->constants());
249 for (int i = 0; i < length; i ++) {
250 //reacquire the table in case a GC happened
251 ExceptionTable table(mh());
252 int beg_bci = table.start_pc(i);
253 int end_bci = table.end_pc(i);
254 assert(beg_bci <= end_bci, "inconsistent exception table");
255 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
256 beg_bci, end_bci);
257
258 if (beg_bci <= throw_bci && throw_bci < end_bci) {
259 // exception handler bci range covers throw_bci => investigate further
260 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
261
262 int handler_bci = table.handler_pc(i);
263 int klass_index = table.catch_type_index(i);
264 if (klass_index == 0) {
265 if (log_is_enabled(Info, exceptions)) {
266 ResourceMark rm(THREAD);
267 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
268 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
269 }
270 return handler_bci;
271 } else if (ex_klass == nullptr) {
272 // Is this even possible?
273 if (log_is_enabled(Info, exceptions)) {
274 ResourceMark rm(THREAD);
275 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
276 mh()->name()->as_C_string(), handler_bci);
277 }
278 return handler_bci;
279 } else {
280 if (log_is_enabled(Debug, exceptions)) {
281 ResourceMark rm(THREAD);
282 log_debug(exceptions)(" - resolving catch type \"%s\"",
283 pool->klass_name_at(klass_index)->as_C_string());
284 }
285 // we know the exception class => get the constraint class
286 // this may require loading of the constraint class; if verification
287 // fails or some other exception occurs, return handler_bci
288 Klass* k = pool->klass_at(klass_index, THREAD);
289 if (HAS_PENDING_EXCEPTION) {
290 if (log_is_enabled(Debug, exceptions)) {
291 ResourceMark rm(THREAD);
292 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
293 PENDING_EXCEPTION->klass()->external_name());
294 }
295 return handler_bci;
296 }
297 assert(k != nullptr, "klass not loaded");
298 if (ex_klass->is_subtype_of(k)) {
299 if (log_is_enabled(Info, exceptions)) {
300 ResourceMark rm(THREAD);
301 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
302 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
303 }
304 return handler_bci;
305 }
306 }
307 }
308 }
309
310 if (log_is_enabled(Debug, exceptions)) {
311 ResourceMark rm(THREAD);
312 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
313 ex_klass->external_name(), mh->name()->as_C_string());
314 }
315
316 return -1;
317 }
318
319 void Method::mask_for(int bci, InterpreterOopMap* mask) {
320 methodHandle h_this(Thread::current(), this);
321 // Only GC uses the OopMapCache during thread stack root scanning
322 // any other uses generate an oopmap but do not save it in the cache.
323 if (Universe::heap()->is_gc_active()) {
324 method_holder()->mask_for(h_this, bci, mask);
325 } else {
326 OopMapCache::compute_one_oop_map(h_this, bci, mask);
327 }
328 return;
329 }
330
331
332 int Method::bci_from(address bcp) const {
333 if (is_native() && bcp == 0) {
334 return 0;
335 }
336 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
337 // may call this after interrupting a nested ResourceMark.
338 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
339 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
340
341 return int(bcp - code_base());
342 }
343
344
345 int Method::validate_bci(int bci) const {
346 return (bci == 0 || bci < code_size()) ? bci : -1;
347 }
348
349 // Return bci if it appears to be a valid bcp
350 // Return -1 otherwise.
351 // Used by profiling code, when invalid data is a possibility.
352 // The caller is responsible for validating the Method* itself.
353 int Method::validate_bci_from_bcp(address bcp) const {
354 // keep bci as -1 if not a valid bci
355 int bci = -1;
356 if (bcp == 0 || bcp == code_base()) {
357 // code_size() may return 0 and we allow 0 here
358 // the method may be native
359 bci = 0;
360 } else if (contains(bcp)) {
361 bci = int(bcp - code_base());
362 }
363 // Assert that if we have dodged any asserts, bci is negative.
364 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
365 return bci;
366 }
367
368 address Method::bcp_from(int bci) const {
369 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
370 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
371 address bcp = code_base() + bci;
372 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
373 return bcp;
374 }
375
376 address Method::bcp_from(address bcp) const {
377 if (is_native() && bcp == nullptr) {
378 return code_base();
379 } else {
380 return bcp;
381 }
382 }
383
384 int Method::size(bool is_native) {
385 // If native, then include pointers for native_function and signature_handler
386 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
387 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
388 return align_metadata_size(header_size() + extra_words);
389 }
390
391 Symbol* Method::klass_name() const {
392 return method_holder()->name();
393 }
394
395 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
396 log_trace(cds)("Iter(Method): %p", this);
397
398 if (!method_holder()->is_rewritten()) {
399 it->push(&_constMethod, MetaspaceClosure::_writable);
400 } else {
401 it->push(&_constMethod);
402 }
403 it->push(&_method_data);
404 it->push(&_method_counters);
405 NOT_PRODUCT(it->push(&_name);)
406 }
407
408 #if INCLUDE_CDS
409 // Attempt to return method to original state. Clear any pointers
410 // (to objects outside the shared spaces). We won't be able to predict
411 // where they should point in a new JVM. Further initialize some
412 // entries now in order allow them to be write protected later.
413
414 void Method::remove_unshareable_info() {
415 unlink_method();
416 JFR_ONLY(REMOVE_METHOD_ID(this);)
417 }
418
419 void Method::restore_unshareable_info(TRAPS) {
420 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
421 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
422 }
423 #endif
424
425 void Method::set_vtable_index(int index) {
426 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
427 // At runtime initialize_vtable is rerun as part of link_class_impl()
428 // for a shared class loaded by the non-boot loader to obtain the loader
429 // constraints based on the runtime classloaders' context.
430 return; // don't write into the shared class
431 } else {
432 _vtable_index = index;
433 }
434 }
435
436 void Method::set_itable_index(int index) {
437 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
438 // At runtime initialize_itable is rerun as part of link_class_impl()
439 // for a shared class loaded by the non-boot loader to obtain the loader
440 // constraints based on the runtime classloaders' context. The dumptime
441 // itable index should be the same as the runtime index.
442 assert(_vtable_index == itable_index_max - index,
443 "archived itable index is different from runtime index");
444 return; // don’t write into the shared class
445 } else {
446 _vtable_index = itable_index_max - index;
447 }
448 assert(valid_itable_index(), "");
449 }
450
451 // The RegisterNatives call being attempted tried to register with a method that
452 // is not native. Ask JVM TI what prefixes have been specified. Then check
453 // to see if the native method is now wrapped with the prefixes. See the
454 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
455 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
456 #if INCLUDE_JVMTI
457 ResourceMark rm(THREAD);
458 Method* method;
459 int name_len = name->utf8_length();
460 char* name_str = name->as_utf8();
461 int prefix_count;
462 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
463 for (int i = 0; i < prefix_count; i++) {
464 char* prefix = prefixes[i];
465 int prefix_len = (int)strlen(prefix);
466
467 // try adding this prefix to the method name and see if it matches another method name
468 int trial_len = name_len + prefix_len;
469 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
470 strcpy(trial_name_str, prefix);
471 strcat(trial_name_str, name_str);
472 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
473 if (trial_name == nullptr) {
474 continue; // no such symbol, so this prefix wasn't used, try the next prefix
475 }
476 method = k->lookup_method(trial_name, signature);
477 if (method == nullptr) {
478 continue; // signature doesn't match, try the next prefix
479 }
480 if (method->is_native()) {
481 method->set_is_prefixed_native();
482 return method; // wahoo, we found a prefixed version of the method, return it
483 }
484 // found as non-native, so prefix is good, add it, probably just need more prefixes
485 name_len = trial_len;
486 name_str = trial_name_str;
487 }
488 #endif // INCLUDE_JVMTI
489 return nullptr; // not found
490 }
491
492 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
493 Method* method = k->lookup_method(name, signature);
494 if (method == nullptr) {
495 ResourceMark rm(THREAD);
496 stringStream st;
497 st.print("Method '");
498 print_external_name(&st, k, name, signature);
499 st.print("' name or signature does not match");
500 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
501 }
502 if (!method->is_native()) {
503 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
504 method = find_prefixed_native(k, name, signature, THREAD);
505 if (method == nullptr) {
506 ResourceMark rm(THREAD);
507 stringStream st;
508 st.print("Method '");
509 print_external_name(&st, k, name, signature);
510 st.print("' is not declared as native");
511 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
512 }
513 }
514
515 if (entry != nullptr) {
516 method->set_native_function(entry, native_bind_event_is_interesting);
517 } else {
518 method->clear_native_function();
519 }
520 if (log_is_enabled(Debug, jni, resolve)) {
521 ResourceMark rm(THREAD);
522 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
523 method->method_holder()->external_name(),
524 method->name()->as_C_string());
525 }
526 return true;
527 }
528
529 bool Method::was_executed_more_than(int n) {
530 // Invocation counter is reset when the Method* is compiled.
531 // If the method has compiled code we therefore assume it has
532 // be executed more than n times.
533 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
534 // interpreter doesn't bump invocation counter of trivial methods
535 // compiler does not bump invocation counter of compiled methods
536 return true;
537 }
538 else if ((method_counters() != nullptr &&
539 method_counters()->invocation_counter()->carry()) ||
540 (method_data() != nullptr &&
541 method_data()->invocation_counter()->carry())) {
542 // The carry bit is set when the counter overflows and causes
543 // a compilation to occur. We don't know how many times
544 // the counter has been reset, so we simply assume it has
545 // been executed more than n times.
546 return true;
547 } else {
548 return invocation_count() > n;
549 }
550 }
551
552 void Method::print_invocation_count() {
553 //---< compose+print method return type, klass, name, and signature >---
554 if (is_static()) tty->print("static ");
555 if (is_final()) tty->print("final ");
556 if (is_synchronized()) tty->print("synchronized ");
557 if (is_native()) tty->print("native ");
558 tty->print("%s::", method_holder()->external_name());
559 name()->print_symbol_on(tty);
560 signature()->print_symbol_on(tty);
561
562 if (WizardMode) {
563 // dump the size of the byte codes
564 tty->print(" {%d}", code_size());
565 }
566 tty->cr();
567
568 // Counting based on signed int counters tends to overflow with
569 // longer-running workloads on fast machines. The counters under
570 // consideration here, however, are limited in range by counting
571 // logic. See InvocationCounter:count_limit for example.
572 // No "overflow precautions" need to be implemented here.
573 tty->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
574 tty->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
575 tty->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
576
577 if (method_data() != nullptr) {
578 tty->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
579 }
580
581 #ifndef PRODUCT
582 if (CountCompiledCalls) {
583 tty->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
584 }
585 #endif
586 }
587
588 // Build a MethodData* object to hold profiling information collected on this
589 // method when requested.
590 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
591 // Do not profile the method if metaspace has hit an OOM previously
592 // allocating profiling data. Callers clear pending exception so don't
593 // add one here.
594 if (ClassLoaderDataGraph::has_metaspace_oom()) {
595 return;
596 }
597
598 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
599 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
600 if (HAS_PENDING_EXCEPTION) {
601 CompileBroker::log_metaspace_failure();
602 ClassLoaderDataGraph::set_metaspace_oom(true);
603 return; // return the exception (which is cleared)
604 }
605
606 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
607 MetadataFactory::free_metadata(loader_data, method_data);
608 return;
609 }
610
611 if (PrintMethodData && (Verbose || WizardMode)) {
612 ResourceMark rm(THREAD);
613 tty->print("build_profiling_method_data for ");
614 method->print_name(tty);
615 tty->cr();
616 // At the end of the run, the MDO, full of data, will be dumped.
617 }
618 }
619
620 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
621 // Do not profile the method if metaspace has hit an OOM previously
622 if (ClassLoaderDataGraph::has_metaspace_oom()) {
623 return nullptr;
624 }
625
626 methodHandle mh(current, m);
627 MethodCounters* counters;
628 if (current->is_Java_thread()) {
629 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
630 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
631 // if needed.
632 counters = MethodCounters::allocate_with_exception(mh, THREAD);
633 if (HAS_PENDING_EXCEPTION) {
634 CLEAR_PENDING_EXCEPTION;
635 }
636 } else {
637 // Call metaspace allocation that doesn't throw exception if the
638 // current thread isn't a JavaThread, ie. the VMThread.
639 counters = MethodCounters::allocate_no_exception(mh);
640 }
641
642 if (counters == nullptr) {
643 CompileBroker::log_metaspace_failure();
644 ClassLoaderDataGraph::set_metaspace_oom(true);
645 return nullptr;
646 }
647
648 if (!mh->init_method_counters(counters)) {
649 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
650 }
651
652 return mh->method_counters();
653 }
654
655 bool Method::init_method_counters(MethodCounters* counters) {
656 // Try to install a pointer to MethodCounters, return true on success.
657 return Atomic::replace_if_null(&_method_counters, counters);
658 }
659
660 int Method::extra_stack_words() {
661 // not an inline function, to avoid a header dependency on Interpreter
662 return extra_stack_entries() * Interpreter::stackElementSize;
663 }
664
665 // InlineKlass the method is declared to return. This must not
666 // safepoint as it is called with references live on the stack at
667 // locations the GC is unaware of.
668 InlineKlass* Method::returns_inline_type(Thread* thread) const {
669 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
670 NoSafepointVerifier nsv;
671 SignatureStream ss(signature());
672 while (!ss.at_return_type()) {
673 ss.next();
674 }
675 return ss.as_inline_klass(method_holder());
676 }
677
678 bool Method::is_vanilla_constructor() const {
679 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
680 // which only calls the superclass vanilla constructor and possibly does stores of
681 // zero constants to local fields:
682 //
683 // aload_0, _fast_aload_0, or _nofast_aload_0
684 // invokespecial
685 // indexbyte1
686 // indexbyte2
687 //
688 // followed by an (optional) sequence of:
689 //
690 // aload_0
691 // aconst_null / iconst_0 / fconst_0 / dconst_0
692 // putfield
693 // indexbyte1
694 // indexbyte2
695 //
696 // followed by:
697 //
698 // return
699
700 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
701 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
702 int size = code_size();
703 // Check if size match
704 if (size == 0 || size % 5 != 0) return false;
705 address cb = code_base();
706 int last = size - 1;
707 if ((cb[0] != Bytecodes::_aload_0 && cb[0] != Bytecodes::_fast_aload_0 && cb[0] != Bytecodes::_nofast_aload_0) ||
708 cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
709 // Does not call superclass default constructor
710 return false;
711 }
712 // Check optional sequence
713 for (int i = 4; i < last; i += 5) {
714 if (cb[i] != Bytecodes::_aload_0) return false;
715 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
716 if (cb[i+2] != Bytecodes::_putfield) return false;
717 }
718 return true;
719 }
720
721
722 bool Method::compute_has_loops_flag() {
723 BytecodeStream bcs(methodHandle(Thread::current(), this));
724 Bytecodes::Code bc;
725
726 while ((bc = bcs.next()) >= 0) {
727 switch (bc) {
728 case Bytecodes::_ifeq:
729 case Bytecodes::_ifnull:
730 case Bytecodes::_iflt:
731 case Bytecodes::_ifle:
732 case Bytecodes::_ifne:
733 case Bytecodes::_ifnonnull:
734 case Bytecodes::_ifgt:
735 case Bytecodes::_ifge:
736 case Bytecodes::_if_icmpeq:
737 case Bytecodes::_if_icmpne:
738 case Bytecodes::_if_icmplt:
739 case Bytecodes::_if_icmpgt:
740 case Bytecodes::_if_icmple:
741 case Bytecodes::_if_icmpge:
742 case Bytecodes::_if_acmpeq:
743 case Bytecodes::_if_acmpne:
744 case Bytecodes::_goto:
745 case Bytecodes::_jsr:
746 if (bcs.dest() < bcs.next_bci()) {
747 return set_has_loops();
748 }
749 break;
750
751 case Bytecodes::_goto_w:
752 case Bytecodes::_jsr_w:
753 if (bcs.dest_w() < bcs.next_bci()) {
754 return set_has_loops();
755 }
756 break;
757
758 case Bytecodes::_lookupswitch: {
759 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
760 if (lookupswitch.default_offset() < 0) {
761 return set_has_loops();
762 } else {
763 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
764 LookupswitchPair pair = lookupswitch.pair_at(i);
765 if (pair.offset() < 0) {
766 return set_has_loops();
767 }
768 }
769 }
770 break;
771 }
772 case Bytecodes::_tableswitch: {
773 Bytecode_tableswitch tableswitch(this, bcs.bcp());
774 if (tableswitch.default_offset() < 0) {
775 return set_has_loops();
776 } else {
777 for (int i = 0; i < tableswitch.length(); ++i) {
778 if (tableswitch.dest_offset_at(i) < 0) {
779 return set_has_loops();
780 }
781 }
782 }
783 break;
784 }
785 default:
786 break;
787 }
788 }
789
790 _flags.set_has_loops_flag_init(true);
791 return false;
792 }
793
794 bool Method::is_final_method(AccessFlags class_access_flags) const {
795 // or "does_not_require_vtable_entry"
796 // default method or overpass can occur, is not final (reuses vtable entry)
797 // private methods in classes get vtable entries for backward class compatibility.
798 if (is_overpass() || is_default_method()) return false;
799 return is_final() || class_access_flags.is_final();
800 }
801
802 bool Method::is_final_method() const {
803 return is_final_method(method_holder()->access_flags());
804 }
805
806 bool Method::is_default_method() const {
807 if (method_holder() != nullptr &&
808 method_holder()->is_interface() &&
809 !is_abstract() && !is_private()) {
810 return true;
811 } else {
812 return false;
813 }
814 }
815
816 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
817 if (is_final_method(class_access_flags)) return true;
818 #ifdef ASSERT
819 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
820 if (class_access_flags.is_interface()) {
821 ResourceMark rm;
822 assert(is_nonv == is_static() || is_nonv == is_private(),
823 "nonvirtual unexpected for non-static, non-private: %s",
824 name_and_sig_as_C_string());
825 }
826 #endif
827 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
828 return vtable_index() == nonvirtual_vtable_index;
829 }
830
831 bool Method::can_be_statically_bound() const {
832 return can_be_statically_bound(method_holder()->access_flags());
833 }
834
835 bool Method::can_be_statically_bound(InstanceKlass* context) const {
836 return (method_holder() == context) && can_be_statically_bound();
837 }
838
839 /**
840 * Returns false if this is one of specially treated methods for
841 * which we have to provide stack trace in throw in compiled code.
842 * Returns true otherwise.
843 */
844 bool Method::can_omit_stack_trace() {
845 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
846 return false; // All methods in sun.invoke.util.ValueConversions
847 }
848 return true;
849 }
850
851 bool Method::is_accessor() const {
852 return is_getter() || is_setter();
853 }
854
855 bool Method::is_getter() const {
856 if (code_size() != 5) return false;
857 if (size_of_parameters() != 1) return false;
858 if (java_code_at(0) != Bytecodes::_aload_0) return false;
859 if (java_code_at(1) != Bytecodes::_getfield) return false;
860 switch (java_code_at(4)) {
861 case Bytecodes::_ireturn:
862 case Bytecodes::_lreturn:
863 case Bytecodes::_freturn:
864 case Bytecodes::_dreturn:
865 case Bytecodes::_areturn:
866 break;
867 default:
868 return false;
869 }
870 if (has_scalarized_return()) {
871 // Don't treat this as (trivial) getter method because the
872 // inline type should be returned in a scalarized form.
873 return false;
874 }
875 return true;
876 }
877
878 bool Method::is_setter() const {
879 if (code_size() != 6) return false;
880 if (java_code_at(0) != Bytecodes::_aload_0) return false;
881 switch (java_code_at(1)) {
882 case Bytecodes::_iload_1:
883 case Bytecodes::_aload_1:
884 case Bytecodes::_fload_1:
885 if (size_of_parameters() != 2) return false;
886 break;
887 case Bytecodes::_dload_1:
888 case Bytecodes::_lload_1:
889 if (size_of_parameters() != 3) return false;
890 break;
891 default:
892 return false;
893 }
894 if (java_code_at(2) != Bytecodes::_putfield) return false;
895 if (java_code_at(5) != Bytecodes::_return) return false;
896 if (has_scalarized_args()) {
897 // Don't treat this as (trivial) setter method because the
898 // inline type argument should be passed in a scalarized form.
899 return false;
900 }
901 return true;
902 }
903
904 bool Method::is_constant_getter() const {
905 int last_index = code_size() - 1;
906 // Check if the first 1-3 bytecodes are a constant push
907 // and the last bytecode is a return.
908 return (2 <= code_size() && code_size() <= 4 &&
909 Bytecodes::is_const(java_code_at(0)) &&
910 Bytecodes::length_for(java_code_at(0)) == last_index &&
911 Bytecodes::is_return(java_code_at(last_index)) &&
912 !has_scalarized_args());
913 }
914
915 bool Method::is_object_constructor_or_class_initializer() const {
916 return (is_object_constructor() || is_class_initializer());
917 }
918
919 bool Method::is_class_initializer() const {
920 // For classfiles version 51 or greater, ensure that the clinit method is
921 // static. Non-static methods with the name "<clinit>" are not static
922 // initializers. (older classfiles exempted for backward compatibility)
923 return (name() == vmSymbols::class_initializer_name() &&
924 (is_static() ||
925 method_holder()->major_version() < 51));
926 }
927
928 // A method named <init>, is a classic object constructor.
929 bool Method::is_object_constructor() const {
930 return name() == vmSymbols::object_initializer_name();
931 }
932
933 // A method named <vnew> is a factory for an inline class.
934 bool Method::is_static_vnew_factory() const {
935 return name() == vmSymbols::inline_factory_name();
936 }
937
938 bool Method::needs_clinit_barrier() const {
939 return is_static() && !method_holder()->is_initialized();
940 }
941
942 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
943 int length = method->checked_exceptions_length();
944 if (length == 0) { // common case
945 return objArrayHandle(THREAD, Universe::the_empty_class_array());
946 } else {
947 methodHandle h_this(THREAD, method);
948 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
949 objArrayHandle mirrors (THREAD, m_oop);
950 for (int i = 0; i < length; i++) {
951 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
952 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
953 if (log_is_enabled(Warning, exceptions) &&
954 !k->is_subclass_of(vmClasses::Throwable_klass())) {
955 ResourceMark rm(THREAD);
956 log_warning(exceptions)(
957 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
958 k->external_name(), method->external_name());
959 }
960 mirrors->obj_at_put(i, k->java_mirror());
961 }
962 return mirrors;
963 }
964 };
965
966
967 int Method::line_number_from_bci(int bci) const {
968 int best_bci = 0;
969 int best_line = -1;
970 if (bci == SynchronizationEntryBCI) bci = 0;
971 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
972 // The line numbers are a short array of 2-tuples [start_pc, line_number].
973 // Not necessarily sorted and not necessarily one-to-one.
974 CompressedLineNumberReadStream stream(compressed_linenumber_table());
975 while (stream.read_pair()) {
976 if (stream.bci() == bci) {
977 // perfect match
978 return stream.line();
979 } else {
980 // update best_bci/line
981 if (stream.bci() < bci && stream.bci() >= best_bci) {
982 best_bci = stream.bci();
983 best_line = stream.line();
984 }
985 }
986 }
987 }
988 return best_line;
989 }
990
991
992 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
993 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
994 Thread *thread = Thread::current();
995 Symbol* klass_name = constants()->klass_name_at(klass_index);
996 Handle loader(thread, method_holder()->class_loader());
997 Handle prot (thread, method_holder()->protection_domain());
998 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != nullptr;
999 } else {
1000 return true;
1001 }
1002 }
1003
1004
1005 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1006 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
1007 if (must_be_resolved) {
1008 // Make sure klass is resolved in constantpool.
1009 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
1010 return false;
1011 }
1012 }
1013 return is_klass_loaded_by_klass_index(klass_index);
1014 }
1015
1016
1017 void Method::set_native_function(address function, bool post_event_flag) {
1018 assert(function != nullptr, "use clear_native_function to unregister natives");
1019 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1020 address* native_function = native_function_addr();
1021
1022 // We can see racers trying to place the same native function into place. Once
1023 // is plenty.
1024 address current = *native_function;
1025 if (current == function) return;
1026 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1027 function != nullptr) {
1028 // native_method_throw_unsatisfied_link_error_entry() should only
1029 // be passed when post_event_flag is false.
1030 assert(function !=
1031 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1032 "post_event_flag mismatch");
1033
1034 // post the bind event, and possible change the bind function
1035 JvmtiExport::post_native_method_bind(this, &function);
1036 }
1037 *native_function = function;
1038 // This function can be called more than once. We must make sure that we always
1039 // use the latest registered method -> check if a stub already has been generated.
1040 // If so, we have to make it not_entrant.
1041 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
1042 if (nm != nullptr) {
1043 nm->make_not_entrant();
1044 }
1045 }
1046
1047
1048 bool Method::has_native_function() const {
1049 if (is_special_native_intrinsic())
1050 return false; // special-cased in SharedRuntime::generate_native_wrapper
1051 address func = native_function();
1052 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1053 }
1054
1055
1056 void Method::clear_native_function() {
1057 // Note: is_method_handle_intrinsic() is allowed here.
1058 set_native_function(
1059 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1060 !native_bind_event_is_interesting);
1061 this->unlink_code();
1062 }
1063
1064
1065 void Method::set_signature_handler(address handler) {
1066 address* signature_handler = signature_handler_addr();
1067 *signature_handler = handler;
1068 }
1069
1070
1071 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1072 assert(reason != nullptr, "must provide a reason");
1073 if (PrintCompilation && report) {
1074 ttyLocker ttyl;
1075 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1076 if (comp_level == CompLevel_all) {
1077 tty->print("all levels ");
1078 } else {
1079 tty->print("level %d ", comp_level);
1080 }
1081 this->print_short_name(tty);
1082 int size = this->code_size();
1083 if (size > 0) {
1084 tty->print(" (%d bytes)", size);
1085 }
1086 if (reason != nullptr) {
1087 tty->print(" %s", reason);
1088 }
1089 tty->cr();
1090 }
1091 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1092 ttyLocker ttyl;
1093 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
1094 os::current_thread_id(), is_osr, comp_level);
1095 if (reason != nullptr) {
1096 xtty->print(" reason=\'%s\'", reason);
1097 }
1098 xtty->method(this);
1099 xtty->stamp();
1100 xtty->end_elem();
1101 }
1102 }
1103
1104 bool Method::is_always_compilable() const {
1105 // Generated adapters must be compiled
1106 if (is_special_native_intrinsic() && is_synthetic()) {
1107 assert(!is_not_c1_compilable(), "sanity check");
1108 assert(!is_not_c2_compilable(), "sanity check");
1109 return true;
1110 }
1111
1112 return false;
1113 }
1114
1115 bool Method::is_not_compilable(int comp_level) const {
1116 if (number_of_breakpoints() > 0)
1117 return true;
1118 if (is_always_compilable())
1119 return false;
1120 if (comp_level == CompLevel_any)
1121 return is_not_c1_compilable() && is_not_c2_compilable();
1122 if (is_c1_compile(comp_level))
1123 return is_not_c1_compilable();
1124 if (is_c2_compile(comp_level))
1125 return is_not_c2_compilable();
1126 return false;
1127 }
1128
1129 // call this when compiler finds that this method is not compilable
1130 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1131 if (is_always_compilable()) {
1132 // Don't mark a method which should be always compilable
1133 return;
1134 }
1135 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1136 if (comp_level == CompLevel_all) {
1137 set_is_not_c1_compilable();
1138 set_is_not_c2_compilable();
1139 } else {
1140 if (is_c1_compile(comp_level))
1141 set_is_not_c1_compilable();
1142 if (is_c2_compile(comp_level))
1143 set_is_not_c2_compilable();
1144 }
1145 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1146 }
1147
1148 bool Method::is_not_osr_compilable(int comp_level) const {
1149 if (is_not_compilable(comp_level))
1150 return true;
1151 if (comp_level == CompLevel_any)
1152 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1153 if (is_c1_compile(comp_level))
1154 return is_not_c1_osr_compilable();
1155 if (is_c2_compile(comp_level))
1156 return is_not_c2_osr_compilable();
1157 return false;
1158 }
1159
1160 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1161 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1162 if (comp_level == CompLevel_all) {
1163 set_is_not_c1_osr_compilable();
1164 set_is_not_c2_osr_compilable();
1165 } else {
1166 if (is_c1_compile(comp_level))
1167 set_is_not_c1_osr_compilable();
1168 if (is_c2_compile(comp_level))
1169 set_is_not_c2_osr_compilable();
1170 }
1171 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1172 }
1173
1174 // Revert to using the interpreter and clear out the nmethod
1175 void Method::clear_code() {
1176 // this may be null if c2i adapters have not been made yet
1177 // Only should happen at allocate time.
1178 if (adapter() == nullptr) {
1179 _from_compiled_entry = nullptr;
1180 _from_compiled_inline_entry = nullptr;
1181 _from_compiled_inline_ro_entry = nullptr;
1182 } else {
1183 _from_compiled_entry = adapter()->get_c2i_entry();
1184 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1185 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1186 }
1187 OrderAccess::storestore();
1188 _from_interpreted_entry = _i2i_entry;
1189 OrderAccess::storestore();
1190 _code = nullptr;
1191 }
1192
1193 void Method::unlink_code(CompiledMethod *compare) {
1194 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? nullptr : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1195 // We need to check if either the _code or _from_compiled_code_entry_point
1196 // refer to this nmethod because there is a race in setting these two fields
1197 // in Method* as seen in bugid 4947125.
1198 if (code() == compare ||
1199 from_compiled_entry() == compare->verified_entry_point()) {
1200 clear_code();
1201 }
1202 }
1203
1204 void Method::unlink_code() {
1205 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? nullptr : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1206 clear_code();
1207 }
1208
1209 #if INCLUDE_CDS
1210 // Called by class data sharing to remove any entry points (which are not shared)
1211 void Method::unlink_method() {
1212 Arguments::assert_is_dumping_archive();
1213 _code = nullptr;
1214 _adapter = nullptr;
1215 _i2i_entry = nullptr;
1216 _from_compiled_entry = nullptr;
1217 _from_compiled_inline_entry = nullptr;
1218 _from_compiled_inline_ro_entry = nullptr;
1219 _from_interpreted_entry = nullptr;
1220
1221 if (is_native()) {
1222 *native_function_addr() = nullptr;
1223 set_signature_handler(nullptr);
1224 }
1225 NOT_PRODUCT(set_compiled_invocation_count(0);)
1226
1227 set_method_data(nullptr);
1228 clear_method_counters();
1229 remove_unshareable_flags();
1230 }
1231
1232 void Method::remove_unshareable_flags() {
1233 // clear all the flags that shouldn't be in the archived version
1234 assert(!is_old(), "must be");
1235 assert(!is_obsolete(), "must be");
1236 assert(!is_deleted(), "must be");
1237
1238 set_is_prefixed_native(false);
1239 set_queued_for_compilation(false);
1240 set_is_not_c2_compilable(false);
1241 set_is_not_c1_compilable(false);
1242 set_is_not_c2_osr_compilable(false);
1243 set_on_stack_flag(false);
1244 }
1245 #endif
1246
1247 // Called when the method_holder is getting linked. Setup entrypoints so the method
1248 // is ready to be called from interpreter, compiler, and vtables.
1249 void Method::link_method(const methodHandle& h_method, TRAPS) {
1250 // If the code cache is full, we may reenter this function for the
1251 // leftover methods that weren't linked.
1252 if (adapter() != nullptr) {
1253 return;
1254 }
1255 assert( _code == nullptr, "nothing compiled yet" );
1256
1257 // Setup interpreter entrypoint
1258 assert(this == h_method(), "wrong h_method()" );
1259
1260 assert(adapter() == nullptr, "init'd to null");
1261 address entry = Interpreter::entry_for_method(h_method);
1262 assert(entry != nullptr, "interpreter entry must be non-null");
1263 // Sets both _i2i_entry and _from_interpreted_entry
1264 set_interpreter_entry(entry);
1265
1266 // Don't overwrite already registered native entries.
1267 if (is_native() && !has_native_function()) {
1268 set_native_function(
1269 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1270 !native_bind_event_is_interesting);
1271 }
1272 if (InlineTypeReturnedAsFields && returns_inline_type(THREAD) && !has_scalarized_return()) {
1273 assert(!constMethod()->is_shared(), "Cannot update shared const objects");
1274 set_has_scalarized_return();
1275 }
1276
1277 // Setup compiler entrypoint. This is made eagerly, so we do not need
1278 // special handling of vtables. An alternative is to make adapters more
1279 // lazily by calling make_adapter() from from_compiled_entry() for the
1280 // normal calls. For vtable calls life gets more complicated. When a
1281 // call-site goes mega-morphic we need adapters in all methods which can be
1282 // called from the vtable. We need adapters on such methods that get loaded
1283 // later. Ditto for mega-morphic itable calls. If this proves to be a
1284 // problem we'll make these lazily later.
1285 (void) make_adapters(h_method, CHECK);
1286
1287 // ONLY USE the h_method now as make_adapter may have blocked
1288
1289 if (h_method->is_continuation_native_intrinsic()) {
1290 // the entry points to this method will be set in set_code, called when first resolving this method
1291 _from_interpreted_entry = nullptr;
1292 _from_compiled_entry = nullptr;
1293 _i2i_entry = nullptr;
1294 }
1295 }
1296
1297 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1298 // Adapters for compiled code are made eagerly here. They are fairly
1299 // small (generally < 100 bytes) and quick to make (and cached and shared)
1300 // so making them eagerly shouldn't be too expensive.
1301 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1302 if (adapter == nullptr ) {
1303 if (!is_init_completed()) {
1304 // Don't throw exceptions during VM initialization because java.lang.* classes
1305 // might not have been initialized, causing problems when constructing the
1306 // Java exception object.
1307 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1308 } else {
1309 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1310 }
1311 }
1312
1313 mh->set_adapter_entry(adapter);
1314 mh->_from_compiled_entry = adapter->get_c2i_entry();
1315 mh->_from_compiled_inline_entry = adapter->get_c2i_inline_entry();
1316 mh->_from_compiled_inline_ro_entry = adapter->get_c2i_inline_ro_entry();
1317 return adapter->get_c2i_entry();
1318 }
1319
1320 // The verified_code_entry() must be called when a invoke is resolved
1321 // on this method.
1322
1323 // It returns the compiled code entry point, after asserting not null.
1324 // This function is called after potential safepoints so that nmethod
1325 // or adapter that it points to is still live and valid.
1326 // This function must not hit a safepoint!
1327 address Method::verified_code_entry() {
1328 debug_only(NoSafepointVerifier nsv;)
1329 assert(_from_compiled_entry != nullptr, "must be set");
1330 return _from_compiled_entry;
1331 }
1332
1333 address Method::verified_inline_code_entry() {
1334 debug_only(NoSafepointVerifier nsv;)
1335 assert(_from_compiled_inline_entry != nullptr, "must be set");
1336 return _from_compiled_inline_entry;
1337 }
1338
1339 address Method::verified_inline_ro_code_entry() {
1340 debug_only(NoSafepointVerifier nsv;)
1341 assert(_from_compiled_inline_ro_entry != nullptr, "must be set");
1342 return _from_compiled_inline_ro_entry;
1343 }
1344
1345 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1346 // (could be racing a deopt).
1347 // Not inline to avoid circular ref.
1348 bool Method::check_code() const {
1349 // cached in a register or local. There's a race on the value of the field.
1350 CompiledMethod *code = Atomic::load_acquire(&_code);
1351 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1352 }
1353
1354 // Install compiled code. Instantly it can execute.
1355 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1356 assert_lock_strong(CompiledMethod_lock);
1357 assert( code, "use clear_code to remove code" );
1358 assert( mh->check_code(), "" );
1359
1360 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1361
1362 // These writes must happen in this order, because the interpreter will
1363 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1364 // which jumps to _from_compiled_entry.
1365 mh->_code = code; // Assign before allowing compiled code to exec
1366
1367 int comp_level = code->comp_level();
1368 // In theory there could be a race here. In practice it is unlikely
1369 // and not worth worrying about.
1370 if (comp_level > mh->highest_comp_level()) {
1371 mh->set_highest_comp_level(comp_level);
1372 }
1373
1374 OrderAccess::storestore();
1375 mh->_from_compiled_entry = code->verified_entry_point();
1376 mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1377 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1378 OrderAccess::storestore();
1379
1380 if (mh->is_continuation_native_intrinsic()) {
1381 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1382
1383 if (mh->is_continuation_enter_intrinsic()) {
1384 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1385 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1386 } else if (mh->is_continuation_yield_intrinsic()) {
1387 mh->_i2i_entry = mh->get_i2c_entry();
1388 } else {
1389 guarantee(false, "Unknown Continuation native intrinsic");
1390 }
1391 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1392 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1393 } else if (!mh->is_method_handle_intrinsic()) {
1394 // Instantly compiled code can execute.
1395 mh->_from_interpreted_entry = mh->get_i2c_entry();
1396 }
1397 }
1398
1399
1400 bool Method::is_overridden_in(Klass* k) const {
1401 InstanceKlass* ik = InstanceKlass::cast(k);
1402
1403 if (ik->is_interface()) return false;
1404
1405 // If method is an interface, we skip it - except if it
1406 // is a miranda method
1407 if (method_holder()->is_interface()) {
1408 // Check that method is not a miranda method
1409 if (ik->lookup_method(name(), signature()) == nullptr) {
1410 // No implementation exist - so miranda method
1411 return false;
1412 }
1413 return true;
1414 }
1415
1416 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1417 if (!has_vtable_index()) {
1418 return false;
1419 } else {
1420 Method* vt_m = ik->method_at_vtable(vtable_index());
1421 return vt_m != this;
1422 }
1423 }
1424
1425
1426 // give advice about whether this Method* should be cached or not
1427 bool Method::should_not_be_cached() const {
1428 if (is_old()) {
1429 // This method has been redefined. It is either EMCP or obsolete
1430 // and we don't want to cache it because that would pin the method
1431 // down and prevent it from being collectible if and when it
1432 // finishes executing.
1433 return true;
1434 }
1435
1436 // caching this method should be just fine
1437 return false;
1438 }
1439
1440
1441 /**
1442 * Returns true if this is one of the specially treated methods for
1443 * security related stack walks (like Reflection.getCallerClass).
1444 */
1445 bool Method::is_ignored_by_security_stack_walk() const {
1446 if (intrinsic_id() == vmIntrinsics::_invoke) {
1447 // This is Method.invoke() -- ignore it
1448 return true;
1449 }
1450 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1451 // This is an auxiliary frame -- ignore it
1452 return true;
1453 }
1454 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1455 // This is an internal adapter frame for method handles -- ignore it
1456 return true;
1457 }
1458 return false;
1459 }
1460
1461
1462 // Constant pool structure for invoke methods:
1463 enum {
1464 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1465 _imcp_invoke_signature, // utf8: (variable Symbol*)
1466 _imcp_limit
1467 };
1468
1469 // Test if this method is an MH adapter frame generated by Java code.
1470 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1471 bool Method::is_compiled_lambda_form() const {
1472 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1473 }
1474
1475 // Test if this method is an internal MH primitive method.
1476 bool Method::is_method_handle_intrinsic() const {
1477 vmIntrinsics::ID iid = intrinsic_id();
1478 return (MethodHandles::is_signature_polymorphic(iid) &&
1479 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1480 }
1481
1482 bool Method::has_member_arg() const {
1483 vmIntrinsics::ID iid = intrinsic_id();
1484 return (MethodHandles::is_signature_polymorphic(iid) &&
1485 MethodHandles::has_member_arg(iid));
1486 }
1487
1488 // Make an instance of a signature-polymorphic internal MH primitive.
1489 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1490 Symbol* signature,
1491 TRAPS) {
1492 ResourceMark rm(THREAD);
1493 methodHandle empty;
1494
1495 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1496 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1497 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1498
1499 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1500
1501 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1502 name->increment_refcount();
1503 signature->increment_refcount();
1504
1505 int cp_length = _imcp_limit;
1506 ClassLoaderData* loader_data = holder->class_loader_data();
1507 constantPoolHandle cp;
1508 {
1509 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1510 cp = constantPoolHandle(THREAD, cp_oop);
1511 }
1512 cp->copy_fields(holder->constants());
1513 cp->set_pool_holder(holder);
1514 cp->symbol_at_put(_imcp_invoke_name, name);
1515 cp->symbol_at_put(_imcp_invoke_signature, signature);
1516 cp->set_has_preresolution();
1517
1518 // decide on access bits: public or not?
1519 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1520 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1521 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1522 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1523
1524 methodHandle m;
1525 {
1526 InlineTableSizes sizes;
1527 Method* m_oop = Method::allocate(loader_data, 0,
1528 accessFlags_from(flags_bits), &sizes,
1529 ConstMethod::NORMAL,
1530 name,
1531 CHECK_(empty));
1532 m = methodHandle(THREAD, m_oop);
1533 }
1534 m->set_constants(cp());
1535 m->set_name_index(_imcp_invoke_name);
1536 m->set_signature_index(_imcp_invoke_signature);
1537 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1538 assert(m->signature() == signature, "");
1539 m->constMethod()->compute_from_signature(signature, must_be_static);
1540 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1541 assert(m->is_method_handle_intrinsic(), "");
1542 #ifdef ASSERT
1543 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1544 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1545 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1546 #endif //ASSERT
1547
1548 // Finally, set up its entry points.
1549 assert(m->can_be_statically_bound(), "");
1550 m->set_vtable_index(Method::nonvirtual_vtable_index);
1551 m->link_method(m, CHECK_(empty));
1552
1553 if (iid == vmIntrinsics::_linkToNative) {
1554 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1555 }
1556 if (log_is_enabled(Debug, methodhandles)) {
1557 LogTarget(Debug, methodhandles) lt;
1558 LogStream ls(lt);
1559 m->print_on(&ls);
1560 }
1561
1562 return m;
1563 }
1564
1565 Klass* Method::check_non_bcp_klass(Klass* klass) {
1566 if (klass != nullptr && klass->class_loader() != nullptr) {
1567 if (klass->is_objArray_klass())
1568 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1569 return klass;
1570 }
1571 return nullptr;
1572 }
1573
1574
1575 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1576 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1577 // Code below does not work for native methods - they should never get rewritten anyway
1578 assert(!m->is_native(), "cannot rewrite native methods");
1579 // Allocate new Method*
1580 AccessFlags flags = m->access_flags();
1581
1582 ConstMethod* cm = m->constMethod();
1583 int checked_exceptions_len = cm->checked_exceptions_length();
1584 int localvariable_len = cm->localvariable_table_length();
1585 int exception_table_len = cm->exception_table_length();
1586 int method_parameters_len = cm->method_parameters_length();
1587 int method_annotations_len = cm->method_annotations_length();
1588 int parameter_annotations_len = cm->parameter_annotations_length();
1589 int type_annotations_len = cm->type_annotations_length();
1590 int default_annotations_len = cm->default_annotations_length();
1591
1592 InlineTableSizes sizes(
1593 localvariable_len,
1594 new_compressed_linenumber_size,
1595 exception_table_len,
1596 checked_exceptions_len,
1597 method_parameters_len,
1598 cm->generic_signature_index(),
1599 method_annotations_len,
1600 parameter_annotations_len,
1601 type_annotations_len,
1602 default_annotations_len,
1603 0);
1604
1605 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1606 Method* newm_oop = Method::allocate(loader_data,
1607 new_code_length,
1608 flags,
1609 &sizes,
1610 m->method_type(),
1611 m->name(),
1612 CHECK_(methodHandle()));
1613 methodHandle newm (THREAD, newm_oop);
1614
1615 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1616 ConstMethod* newcm = newm->constMethod();
1617 int new_const_method_size = newm->constMethod()->size();
1618
1619 // This works because the source and target are both Methods. Some compilers
1620 // (e.g., clang) complain that the target vtable pointer will be stomped,
1621 // so cast away newm()'s and m()'s Methodness.
1622 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1623
1624 // Create shallow copy of ConstMethod.
1625 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1626
1627 // Reset correct method/const method, method size, and parameter info
1628 newm->set_constMethod(newcm);
1629 newm->constMethod()->set_code_size(new_code_length);
1630 newm->constMethod()->set_constMethod_size(new_const_method_size);
1631 assert(newm->code_size() == new_code_length, "check");
1632 assert(newm->method_parameters_length() == method_parameters_len, "check");
1633 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1634 assert(newm->exception_table_length() == exception_table_len, "check");
1635 assert(newm->localvariable_table_length() == localvariable_len, "check");
1636 // Copy new byte codes
1637 memcpy(newm->code_base(), new_code, new_code_length);
1638 // Copy line number table
1639 if (new_compressed_linenumber_size > 0) {
1640 memcpy(newm->compressed_linenumber_table(),
1641 new_compressed_linenumber_table,
1642 new_compressed_linenumber_size);
1643 }
1644 // Copy method_parameters
1645 if (method_parameters_len > 0) {
1646 memcpy(newm->method_parameters_start(),
1647 m->method_parameters_start(),
1648 method_parameters_len * sizeof(MethodParametersElement));
1649 }
1650 // Copy checked_exceptions
1651 if (checked_exceptions_len > 0) {
1652 memcpy(newm->checked_exceptions_start(),
1653 m->checked_exceptions_start(),
1654 checked_exceptions_len * sizeof(CheckedExceptionElement));
1655 }
1656 // Copy exception table
1657 if (exception_table_len > 0) {
1658 memcpy(newm->exception_table_start(),
1659 m->exception_table_start(),
1660 exception_table_len * sizeof(ExceptionTableElement));
1661 }
1662 // Copy local variable number table
1663 if (localvariable_len > 0) {
1664 memcpy(newm->localvariable_table_start(),
1665 m->localvariable_table_start(),
1666 localvariable_len * sizeof(LocalVariableTableElement));
1667 }
1668 // Copy stackmap table
1669 if (m->has_stackmap_table()) {
1670 int code_attribute_length = m->stackmap_data()->length();
1671 Array<u1>* stackmap_data =
1672 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1673 memcpy((void*)stackmap_data->adr_at(0),
1674 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1675 newm->set_stackmap_data(stackmap_data);
1676 }
1677
1678 // copy annotations over to new method
1679 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1680 return newm;
1681 }
1682
1683 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1684 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1685 // because we are not loading from core libraries
1686 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1687 // which does not use the class default class loader so we check for its loader here
1688 const InstanceKlass* ik = InstanceKlass::cast(holder);
1689 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1690 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1691 }
1692
1693 // see if the klass name is well-known:
1694 Symbol* klass_name = ik->name();
1695 vmSymbolID id = vmSymbols::find_sid(klass_name);
1696 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1697 return id;
1698 } else {
1699 return vmSymbolID::NO_SID;
1700 }
1701 }
1702
1703 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1704 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1705 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1706 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1707 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1708
1709 // the klass name is well-known:
1710 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1711 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1712
1713 // ditto for method and signature:
1714 vmSymbolID name_id = vmSymbols::find_sid(name());
1715 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1716 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1717 && name_id == vmSymbolID::NO_SID) {
1718 return;
1719 }
1720 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1721 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1722 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1723 && sig_id == vmSymbolID::NO_SID) {
1724 return;
1725 }
1726 jshort flags = access_flags().as_short();
1727
1728 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1729 if (id != vmIntrinsics::_none) {
1730 set_intrinsic_id(id);
1731 if (id == vmIntrinsics::_Class_cast) {
1732 // Even if the intrinsic is rejected, we want to inline this simple method.
1733 set_force_inline();
1734 }
1735 return;
1736 }
1737
1738 // A few slightly irregular cases:
1739 switch (klass_id) {
1740 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1741 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1742 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1743 if (!is_native()) break;
1744 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1745 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1746 id = vmIntrinsics::_none;
1747 break;
1748
1749 default:
1750 break;
1751 }
1752
1753 if (id != vmIntrinsics::_none) {
1754 // Set up its iid. It is an alias method.
1755 set_intrinsic_id(id);
1756 return;
1757 }
1758 }
1759
1760 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1761 if (!THREAD->can_call_java()) {
1762 // There is nothing useful this routine can do from within the Compile thread.
1763 // Hopefully, the signature contains only well-known classes.
1764 // We could scan for this and return true/false, but the caller won't care.
1765 return false;
1766 }
1767 bool sig_is_loaded = true;
1768 ResourceMark rm(THREAD);
1769 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1770 if (ss.is_reference()) {
1771 // load everything, including arrays "[Lfoo;"
1772 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1773 // We are loading classes eagerly. If a ClassNotFoundException or
1774 // a LinkageError was generated, be sure to ignore it.
1775 if (HAS_PENDING_EXCEPTION) {
1776 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1777 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1778 CLEAR_PENDING_EXCEPTION;
1779 } else {
1780 return false;
1781 }
1782 }
1783 if( klass == nullptr) { sig_is_loaded = false; }
1784 }
1785 }
1786 return sig_is_loaded;
1787 }
1788
1789 // Exposed so field engineers can debug VM
1790 void Method::print_short_name(outputStream* st) const {
1791 ResourceMark rm;
1792 #ifdef PRODUCT
1793 st->print(" %s::", method_holder()->external_name());
1794 #else
1795 st->print(" %s::", method_holder()->internal_name());
1796 #endif
1797 name()->print_symbol_on(st);
1798 if (WizardMode) signature()->print_symbol_on(st);
1799 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1800 MethodHandles::print_as_basic_type_signature_on(st, signature());
1801 }
1802
1803 // Comparer for sorting an object array containing
1804 // Method*s.
1805 static int method_comparator(Method* a, Method* b) {
1806 return a->name()->fast_compare(b->name());
1807 }
1808
1809 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1810 // default_methods also uses this without the ordering for fast find_method
1811 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1812 int length = methods->length();
1813 if (length > 1) {
1814 if (func == nullptr) {
1815 func = method_comparator;
1816 }
1817 {
1818 NoSafepointVerifier nsv;
1819 QuickSort::sort(methods->data(), length, func, /*idempotent=*/false);
1820 }
1821 // Reset method ordering
1822 if (set_idnums) {
1823 for (u2 i = 0; i < length; i++) {
1824 Method* m = methods->at(i);
1825 m->set_method_idnum(i);
1826 m->set_orig_method_idnum(i);
1827 }
1828 }
1829 }
1830 }
1831
1832 //-----------------------------------------------------------------------------------
1833 // Non-product code unless JVM/TI needs it
1834
1835 #if !defined(PRODUCT) || INCLUDE_JVMTI
1836 class SignatureTypePrinter : public SignatureTypeNames {
1837 private:
1838 outputStream* _st;
1839 bool _use_separator;
1840
1841 void type_name(const char* name) {
1842 if (_use_separator) _st->print(", ");
1843 _st->print("%s", name);
1844 _use_separator = true;
1845 }
1846
1847 public:
1848 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1849 _st = st;
1850 _use_separator = false;
1851 }
1852
1853 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1854 void print_returntype() { _use_separator = false; do_type(return_type()); }
1855 };
1856
1857
1858 void Method::print_name(outputStream* st) const {
1859 Thread *thread = Thread::current();
1860 ResourceMark rm(thread);
1861 st->print("%s ", is_static() ? "static" : "virtual");
1862 if (WizardMode) {
1863 st->print("%s.", method_holder()->internal_name());
1864 name()->print_symbol_on(st);
1865 signature()->print_symbol_on(st);
1866 } else {
1867 SignatureTypePrinter sig(signature(), st);
1868 sig.print_returntype();
1869 st->print(" %s.", method_holder()->internal_name());
1870 name()->print_symbol_on(st);
1871 st->print("(");
1872 sig.print_parameters();
1873 st->print(")");
1874 }
1875 }
1876 #endif // !PRODUCT || INCLUDE_JVMTI
1877
1878
1879 void Method::print_codes_on(outputStream* st, int flags) const {
1880 print_codes_on(0, code_size(), st, flags);
1881 }
1882
1883 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1884 Thread *thread = Thread::current();
1885 ResourceMark rm(thread);
1886 methodHandle mh (thread, (Method*)this);
1887 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1888 }
1889
1890 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1891 _bci = 0;
1892 _line = 0;
1893 };
1894
1895 bool CompressedLineNumberReadStream::read_pair() {
1896 jubyte next = read_byte();
1897 // Check for terminator
1898 if (next == 0) return false;
1899 if (next == 0xFF) {
1900 // Escape character, regular compression used
1901 _bci += read_signed_int();
1902 _line += read_signed_int();
1903 } else {
1904 // Single byte compression used
1905 _bci += next >> 3;
1906 _line += next & 0x7;
1907 }
1908 return true;
1909 }
1910
1911 #if INCLUDE_JVMTI
1912
1913 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1914 BreakpointInfo* bp = method_holder()->breakpoints();
1915 for (; bp != nullptr; bp = bp->next()) {
1916 if (bp->match(this, bci)) {
1917 return bp->orig_bytecode();
1918 }
1919 }
1920 {
1921 ResourceMark rm;
1922 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1923 }
1924 return Bytecodes::_shouldnotreachhere;
1925 }
1926
1927 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1928 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1929 BreakpointInfo* bp = method_holder()->breakpoints();
1930 for (; bp != nullptr; bp = bp->next()) {
1931 if (bp->match(this, bci)) {
1932 bp->set_orig_bytecode(code);
1933 // and continue, in case there is more than one
1934 }
1935 }
1936 }
1937
1938 void Method::set_breakpoint(int bci) {
1939 InstanceKlass* ik = method_holder();
1940 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1941 bp->set_next(ik->breakpoints());
1942 ik->set_breakpoints(bp);
1943 // do this last:
1944 bp->set(this);
1945 }
1946
1947 static void clear_matches(Method* m, int bci) {
1948 InstanceKlass* ik = m->method_holder();
1949 BreakpointInfo* prev_bp = nullptr;
1950 BreakpointInfo* next_bp;
1951 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1952 next_bp = bp->next();
1953 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1954 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1955 // do this first:
1956 bp->clear(m);
1957 // unhook it
1958 if (prev_bp != nullptr)
1959 prev_bp->set_next(next_bp);
1960 else
1961 ik->set_breakpoints(next_bp);
1962 delete bp;
1963 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1964 // at same location. So we have multiple matching (method_index and bci)
1965 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1966 // breakpoint for clear_breakpoint request and keep all other method versions
1967 // BreakpointInfo for future clear_breakpoint request.
1968 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1969 // which is being called when class is unloaded. We delete all the Breakpoint
1970 // information for all versions of method. We may not correctly restore the original
1971 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1972 // so these methods won't be used anymore.
1973 if (bci >= 0) {
1974 break;
1975 }
1976 } else {
1977 // This one is a keeper.
1978 prev_bp = bp;
1979 }
1980 }
1981 }
1982
1983 void Method::clear_breakpoint(int bci) {
1984 assert(bci >= 0, "");
1985 clear_matches(this, bci);
1986 }
1987
1988 void Method::clear_all_breakpoints() {
1989 clear_matches(this, -1);
1990 }
1991
1992 #endif // INCLUDE_JVMTI
1993
1994 int Method::invocation_count() const {
1995 MethodCounters* mcs = method_counters();
1996 MethodData* mdo = method_data();
1997 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) ||
1998 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) {
1999 return InvocationCounter::count_limit;
2000 } else {
2001 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) +
2002 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0);
2003 }
2004 }
2005
2006 int Method::backedge_count() const {
2007 MethodCounters* mcs = method_counters();
2008 MethodData* mdo = method_data();
2009 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) ||
2010 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) {
2011 return InvocationCounter::count_limit;
2012 } else {
2013 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) +
2014 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0);
2015 }
2016 }
2017
2018 int Method::highest_comp_level() const {
2019 const MethodCounters* mcs = method_counters();
2020 if (mcs != nullptr) {
2021 return mcs->highest_comp_level();
2022 } else {
2023 return CompLevel_none;
2024 }
2025 }
2026
2027 int Method::highest_osr_comp_level() const {
2028 const MethodCounters* mcs = method_counters();
2029 if (mcs != nullptr) {
2030 return mcs->highest_osr_comp_level();
2031 } else {
2032 return CompLevel_none;
2033 }
2034 }
2035
2036 void Method::set_highest_comp_level(int level) {
2037 MethodCounters* mcs = method_counters();
2038 if (mcs != nullptr) {
2039 mcs->set_highest_comp_level(level);
2040 }
2041 }
2042
2043 void Method::set_highest_osr_comp_level(int level) {
2044 MethodCounters* mcs = method_counters();
2045 if (mcs != nullptr) {
2046 mcs->set_highest_osr_comp_level(level);
2047 }
2048 }
2049
2050 #if INCLUDE_JVMTI
2051
2052 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2053 _bci = bci;
2054 _name_index = m->name_index();
2055 _signature_index = m->signature_index();
2056 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2057 if (_orig_bytecode == Bytecodes::_breakpoint)
2058 _orig_bytecode = m->orig_bytecode_at(_bci);
2059 _next = nullptr;
2060 }
2061
2062 void BreakpointInfo::set(Method* method) {
2063 #ifdef ASSERT
2064 {
2065 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2066 if (code == Bytecodes::_breakpoint)
2067 code = method->orig_bytecode_at(_bci);
2068 assert(orig_bytecode() == code, "original bytecode must be the same");
2069 }
2070 #endif
2071 Thread *thread = Thread::current();
2072 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2073 method->incr_number_of_breakpoints(thread);
2074 {
2075 // Deoptimize all dependents on this method
2076 HandleMark hm(thread);
2077 methodHandle mh(thread, method);
2078 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2079 }
2080 }
2081
2082 void BreakpointInfo::clear(Method* method) {
2083 *method->bcp_from(_bci) = orig_bytecode();
2084 assert(method->number_of_breakpoints() > 0, "must not go negative");
2085 method->decr_number_of_breakpoints(Thread::current());
2086 }
2087
2088 #endif // INCLUDE_JVMTI
2089
2090 // jmethodID handling
2091
2092 // This is a block allocating object, sort of like JNIHandleBlock, only a
2093 // lot simpler.
2094 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2095 // never get rid of it.
2096
2097 static const int min_block_size = 8;
2098
2099 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2100 friend class JNIMethodBlock;
2101 Method** _methods;
2102 int _number_of_methods;
2103 int _top;
2104 JNIMethodBlockNode* _next;
2105
2106 public:
2107
2108 JNIMethodBlockNode(int num_methods = min_block_size);
2109
2110 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2111
2112 void ensure_methods(int num_addl_methods) {
2113 if (_top < _number_of_methods) {
2114 num_addl_methods -= _number_of_methods - _top;
2115 if (num_addl_methods <= 0) {
2116 return;
2117 }
2118 }
2119 if (_next == nullptr) {
2120 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2121 } else {
2122 _next->ensure_methods(num_addl_methods);
2123 }
2124 }
2125 };
2126
2127 class JNIMethodBlock : public CHeapObj<mtClass> {
2128 JNIMethodBlockNode _head;
2129 JNIMethodBlockNode *_last_free;
2130 public:
2131 static Method* const _free_method;
2132
2133 JNIMethodBlock(int initial_capacity = min_block_size)
2134 : _head(initial_capacity), _last_free(&_head) {}
2135
2136 void ensure_methods(int num_addl_methods) {
2137 _last_free->ensure_methods(num_addl_methods);
2138 }
2139
2140 Method** add_method(Method* m) {
2141 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2142 if (b->_top < b->_number_of_methods) {
2143 // top points to the next free entry.
2144 int i = b->_top;
2145 b->_methods[i] = m;
2146 b->_top++;
2147 _last_free = b;
2148 return &(b->_methods[i]);
2149 } else if (b->_top == b->_number_of_methods) {
2150 // if the next free entry ran off the block see if there's a free entry
2151 for (int i = 0; i < b->_number_of_methods; i++) {
2152 if (b->_methods[i] == _free_method) {
2153 b->_methods[i] = m;
2154 _last_free = b;
2155 return &(b->_methods[i]);
2156 }
2157 }
2158 // Only check each block once for frees. They're very unlikely.
2159 // Increment top past the end of the block.
2160 b->_top++;
2161 }
2162 // need to allocate a next block.
2163 if (b->_next == nullptr) {
2164 b->_next = _last_free = new JNIMethodBlockNode();
2165 }
2166 }
2167 guarantee(false, "Should always allocate a free block");
2168 return nullptr;
2169 }
2170
2171 bool contains(Method** m) {
2172 if (m == nullptr) return false;
2173 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2174 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2175 // This is a bit of extra checking, for two reasons. One is
2176 // that contains() deals with pointers that are passed in by
2177 // JNI code, so making sure that the pointer is aligned
2178 // correctly is valuable. The other is that <= and > are
2179 // technically not defined on pointers, so the if guard can
2180 // pass spuriously; no modern compiler is likely to make that
2181 // a problem, though (and if one did, the guard could also
2182 // fail spuriously, which would be bad).
2183 ptrdiff_t idx = m - b->_methods;
2184 if (b->_methods + idx == m) {
2185 return true;
2186 }
2187 }
2188 }
2189 return false; // not found
2190 }
2191
2192 // Doesn't really destroy it, just marks it as free so it can be reused.
2193 void destroy_method(Method** m) {
2194 #ifdef ASSERT
2195 assert(contains(m), "should be a methodID");
2196 #endif // ASSERT
2197 *m = _free_method;
2198 }
2199
2200 // During class unloading the methods are cleared, which is different
2201 // than freed.
2202 void clear_all_methods() {
2203 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2204 for (int i = 0; i< b->_number_of_methods; i++) {
2205 b->_methods[i] = nullptr;
2206 }
2207 }
2208 }
2209 #ifndef PRODUCT
2210 int count_methods() {
2211 // count all allocated methods
2212 int count = 0;
2213 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2214 for (int i = 0; i< b->_number_of_methods; i++) {
2215 if (b->_methods[i] != _free_method) count++;
2216 }
2217 }
2218 return count;
2219 }
2220 #endif // PRODUCT
2221 };
2222
2223 // Something that can't be mistaken for an address or a markWord
2224 Method* const JNIMethodBlock::_free_method = (Method*)55;
2225
2226 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2227 _number_of_methods = MAX2(num_methods, min_block_size);
2228 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2229 for (int i = 0; i < _number_of_methods; i++) {
2230 _methods[i] = JNIMethodBlock::_free_method;
2231 }
2232 }
2233
2234 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2235 // Have to add jmethod_ids() to class loader data thread-safely.
2236 // Also have to add the method to the list safely, which the lock
2237 // protects as well.
2238 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2239 if (cld->jmethod_ids() == nullptr) {
2240 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2241 } else {
2242 cld->jmethod_ids()->ensure_methods(capacity);
2243 }
2244 }
2245
2246 // Add a method id to the jmethod_ids
2247 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2248 // Have to add jmethod_ids() to class loader data thread-safely.
2249 // Also have to add the method to the list safely, which the lock
2250 // protects as well.
2251 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2252 if (cld->jmethod_ids() == nullptr) {
2253 cld->set_jmethod_ids(new JNIMethodBlock());
2254 }
2255 // jmethodID is a pointer to Method*
2256 return (jmethodID)cld->jmethod_ids()->add_method(m);
2257 }
2258
2259 jmethodID Method::jmethod_id() {
2260 methodHandle mh(Thread::current(), this);
2261 return method_holder()->get_jmethod_id(mh);
2262 }
2263
2264 // Mark a jmethodID as free. This is called when there is a data race in
2265 // InstanceKlass while creating the jmethodID cache.
2266 void Method::destroy_jmethod_id(ClassLoaderData* cld, jmethodID m) {
2267 Method** ptr = (Method**)m;
2268 assert(cld->jmethod_ids() != nullptr, "should have method handles");
2269 cld->jmethod_ids()->destroy_method(ptr);
2270 }
2271
2272 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2273 // Can't assert the method_holder is the same because the new method has the
2274 // scratch method holder.
2275 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2276 == new_method->method_holder()->class_loader() ||
2277 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2278 "changing to a different class loader");
2279 // Just change the method in place, jmethodID pointer doesn't change.
2280 *((Method**)jmid) = new_method;
2281 }
2282
2283 bool Method::is_method_id(jmethodID mid) {
2284 Method* m = resolve_jmethod_id(mid);
2285 assert(m != nullptr, "should be called with non-null method");
2286 InstanceKlass* ik = m->method_holder();
2287 ClassLoaderData* cld = ik->class_loader_data();
2288 if (cld->jmethod_ids() == nullptr) return false;
2289 return (cld->jmethod_ids()->contains((Method**)mid));
2290 }
2291
2292 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2293 if (mid == nullptr) return nullptr;
2294 Method* o = resolve_jmethod_id(mid);
2295 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2296 return nullptr;
2297 }
2298 // Method should otherwise be valid. Assert for testing.
2299 assert(is_valid_method(o), "should be valid jmethodid");
2300 // If the method's class holder object is unreferenced, but not yet marked as
2301 // unloaded, we need to return null here too because after a safepoint, its memory
2302 // will be reclaimed.
2303 return o->method_holder()->is_loader_alive() ? o : nullptr;
2304 };
2305
2306 void Method::set_on_stack(const bool value) {
2307 // Set both the method itself and its constant pool. The constant pool
2308 // on stack means some method referring to it is also on the stack.
2309 constants()->set_on_stack(value);
2310
2311 bool already_set = on_stack_flag();
2312 set_on_stack_flag(value);
2313 if (value && !already_set) {
2314 MetadataOnStackMark::record(this);
2315 }
2316 }
2317
2318 void Method::record_gc_epoch() {
2319 // If any method is on the stack in continuations, none of them can be reclaimed,
2320 // so save the marking cycle to check for the whole class in the cpCache.
2321 // The cpCache is writeable.
2322 constants()->cache()->record_gc_epoch();
2323 }
2324
2325 // Called when the class loader is unloaded to make all methods weak.
2326 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2327 loader_data->jmethod_ids()->clear_all_methods();
2328 }
2329
2330 bool Method::has_method_vptr(const void* ptr) {
2331 Method m;
2332 // This assumes that the vtbl pointer is the first word of a C++ object.
2333 return dereference_vptr(&m) == dereference_vptr(ptr);
2334 }
2335
2336 // Check that this pointer is valid by checking that the vtbl pointer matches
2337 bool Method::is_valid_method(const Method* m) {
2338 if (m == nullptr) {
2339 return false;
2340 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2341 // Quick sanity check on pointer.
2342 return false;
2343 } else if (!os::is_readable_range(m, m + 1)) {
2344 return false;
2345 } else if (m->is_shared()) {
2346 return CppVtables::is_valid_shared_method(m);
2347 } else if (Metaspace::contains_non_shared(m)) {
2348 return has_method_vptr((const void*)m);
2349 } else {
2350 return false;
2351 }
2352 }
2353
2354 bool Method::is_scalarized_arg(int idx) const {
2355 if (!has_scalarized_args()) {
2356 return false;
2357 }
2358 // Search through signature and check if argument is wrapped in T_PRIMITIVE_OBJECT/T_VOID
2359 int depth = 0;
2360 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2361 for (int i = 0; i < sig->length(); i++) {
2362 BasicType bt = sig->at(i)._bt;
2363 if (bt == T_PRIMITIVE_OBJECT) {
2364 depth++;
2365 }
2366 if (idx == 0) {
2367 break; // Argument found
2368 }
2369 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2370 depth--;
2371 }
2372 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2373 idx--; // Advance to next argument
2374 }
2375 }
2376 return depth != 0;
2377 }
2378
2379 #ifndef PRODUCT
2380 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2381 out->print("%d", loader_data->jmethod_ids()->count_methods());
2382 }
2383 #endif // PRODUCT
2384
2385
2386 // Printing
2387
2388 #ifndef PRODUCT
2389
2390 void Method::print_on(outputStream* st) const {
2391 ResourceMark rm;
2392 assert(is_method(), "must be method");
2393 st->print_cr("%s", internal_name());
2394 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2395 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2396 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2397 constants()->print_value_on(st); st->cr();
2398 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2399 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2400 st->print (" - name: "); name()->print_value_on(st); st->cr();
2401 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2402 st->print_cr(" - max stack: %d", max_stack());
2403 st->print_cr(" - max locals: %d", max_locals());
2404 st->print_cr(" - size of params: %d", size_of_parameters());
2405 st->print_cr(" - method size: %d", method_size());
2406 if (intrinsic_id() != vmIntrinsics::_none)
2407 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2408 if (highest_comp_level() != CompLevel_none)
2409 st->print_cr(" - highest level: %d", highest_comp_level());
2410 st->print_cr(" - vtable index: %d", _vtable_index);
2411 #ifdef ASSERT
2412 if (valid_itable_index())
2413 st->print_cr(" - itable index: %d", itable_index());
2414 #endif
2415 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2416 st->print( " - adapters: ");
2417 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2418 if (a == nullptr)
2419 st->print_cr(PTR_FORMAT, p2i(a));
2420 else
2421 a->print_adapter_on(st);
2422 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2423 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2424 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry()));
2425 st->print_cr(" - code size: %d", code_size());
2426 if (code_size() != 0) {
2427 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2428 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2429 }
2430 if (method_data() != nullptr) {
2431 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2432 }
2433 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2434 if (checked_exceptions_length() > 0) {
2435 CheckedExceptionElement* table = checked_exceptions_start();
2436 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2437 if (Verbose) {
2438 for (int i = 0; i < checked_exceptions_length(); i++) {
2439 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2440 }
2441 }
2442 }
2443 if (has_linenumber_table()) {
2444 u_char* table = compressed_linenumber_table();
2445 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2446 if (Verbose) {
2447 CompressedLineNumberReadStream stream(table);
2448 while (stream.read_pair()) {
2449 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2450 }
2451 }
2452 }
2453 st->print_cr(" - localvar length: %d", localvariable_table_length());
2454 if (localvariable_table_length() > 0) {
2455 LocalVariableTableElement* table = localvariable_table_start();
2456 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2457 if (Verbose) {
2458 for (int i = 0; i < localvariable_table_length(); i++) {
2459 int bci = table[i].start_bci;
2460 int len = table[i].length;
2461 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2462 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2463 int slot = table[i].slot;
2464 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2465 }
2466 }
2467 }
2468 if (code() != nullptr) {
2469 st->print (" - compiled code: ");
2470 code()->print_value_on(st);
2471 }
2472 if (is_native()) {
2473 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2474 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2475 }
2476 }
2477
2478 void Method::print_linkage_flags(outputStream* st) {
2479 access_flags().print_on(st);
2480 if (is_default_method()) {
2481 st->print("default ");
2482 }
2483 if (is_overpass()) {
2484 st->print("overpass ");
2485 }
2486 }
2487 #endif //PRODUCT
2488
2489 void Method::print_value_on(outputStream* st) const {
2490 assert(is_method(), "must be method");
2491 st->print("%s", internal_name());
2492 print_address_on(st);
2493 st->print(" ");
2494 if (WizardMode) access_flags().print_on(st);
2495 name()->print_value_on(st);
2496 st->print(" ");
2497 signature()->print_value_on(st);
2498 st->print(" in ");
2499 method_holder()->print_value_on(st);
2500 if (WizardMode) st->print("#%d", _vtable_index);
2501 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2502 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2503 }
2504
2505 // Verification
2506
2507 void Method::verify_on(outputStream* st) {
2508 guarantee(is_method(), "object must be method");
2509 guarantee(constants()->is_constantPool(), "should be constant pool");
2510 MethodData* md = method_data();
2511 guarantee(md == nullptr ||
2512 md->is_methodData(), "should be method data");
2513 }