1 /*
2 * Copyright (c) 1997, 2025, 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 "cds/cdsConfig.hpp"
26 #include "cds/cppVtables.hpp"
27 #include "cds/metaspaceShared.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderDataGraph.hpp"
30 #include "classfile/metadataOnStackMark.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmClasses.hpp"
34 #include "code/codeCache.hpp"
35 #include "code/debugInfoRec.hpp"
36 #include "compiler/compilationPolicy.hpp"
37 #include "gc/shared/collectedHeap.inline.hpp"
38 #include "interpreter/bytecodeStream.hpp"
39 #include "interpreter/bytecodeTracer.hpp"
40 #include "interpreter/bytecodes.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/metaspaceClosure.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "nmt/memTracker.hpp"
53 #include "oops/constMethod.hpp"
54 #include "oops/constantPool.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/methodData.hpp"
58 #include "oops/objArrayKlass.hpp"
59 #include "oops/objArrayOop.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/symbol.hpp"
62 #include "oops/inlineKlass.inline.hpp"
63 #include "prims/jvmtiExport.hpp"
64 #include "prims/methodHandles.hpp"
65 #include "runtime/atomic.hpp"
66 #include "runtime/arguments.hpp"
67 #include "runtime/continuationEntry.hpp"
68 #include "runtime/frame.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/init.hpp"
71 #include "runtime/java.hpp"
72 #include "runtime/orderAccess.hpp"
73 #include "runtime/perfData.hpp"
74 #include "runtime/relocator.hpp"
75 #include "runtime/safepointVerifiers.hpp"
76 #include "runtime/sharedRuntime.hpp"
77 #include "runtime/signature.hpp"
78 #include "runtime/threads.hpp"
79 #include "runtime/vm_version.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/quickSort.hpp"
82 #include "utilities/vmError.hpp"
83 #include "utilities/xmlstream.hpp"
84
85 // Implementation of Method
86
87 Method* Method::allocate(ClassLoaderData* loader_data,
88 int byte_code_size,
89 AccessFlags access_flags,
90 InlineTableSizes* sizes,
91 ConstMethod::MethodType method_type,
92 Symbol* name,
93 TRAPS) {
94 assert(!access_flags.is_native() || byte_code_size == 0,
95 "native methods should not contain byte codes");
96 ConstMethod* cm = ConstMethod::allocate(loader_data,
97 byte_code_size,
98 sizes,
99 method_type,
100 CHECK_NULL);
101 int size = Method::size(access_flags.is_native());
102 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
103 }
104
105 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
106 NoSafepointVerifier no_safepoint;
107 set_constMethod(xconst);
108 set_access_flags(access_flags);
109 set_intrinsic_id(vmIntrinsics::_none);
110 clear_method_data();
111 clear_method_counters();
112 set_vtable_index(Method::garbage_vtable_index);
113
114 // Fix and bury in Method*
115 set_interpreter_entry(nullptr); // sets i2i entry and from_int
116 set_adapter_entry(nullptr);
117 Method::clear_code(); // from_c/from_i get set to c2i/i2i
118
119 if (access_flags.is_native()) {
120 clear_native_function();
121 set_signature_handler(nullptr);
122 }
123 NOT_PRODUCT(set_compiled_invocation_count(0);)
124 // Name is very useful for debugging.
125 NOT_PRODUCT(_name = name;)
126 }
127
128 // Release Method*. The nmethod will be gone when we get here because
129 // we've walked the code cache.
130 void Method::deallocate_contents(ClassLoaderData* loader_data) {
131 MetadataFactory::free_metadata(loader_data, constMethod());
132 set_constMethod(nullptr);
133 MetadataFactory::free_metadata(loader_data, method_data());
134 clear_method_data();
135 MetadataFactory::free_metadata(loader_data, method_counters());
136 clear_method_counters();
137 // The nmethod will be gone when we get here.
138 if (code() != nullptr) _code = nullptr;
139 }
140
141 void Method::release_C_heap_structures() {
142 if (method_data()) {
143 method_data()->release_C_heap_structures();
144
145 // Destroy MethodData embedded lock
146 method_data()->~MethodData();
147 }
148 }
149
150 address Method::get_i2c_entry() {
151 assert(adapter() != nullptr, "must have");
152 return adapter()->get_i2c_entry();
153 }
154
155 address Method::get_c2i_entry() {
156 assert(adapter() != nullptr, "must have");
157 return adapter()->get_c2i_entry();
158 }
159
160 address Method::get_c2i_inline_entry() {
161 assert(adapter() != nullptr, "must have");
162 return adapter()->get_c2i_inline_entry();
163 }
164
165 address Method::get_c2i_unverified_entry() {
166 assert(adapter() != nullptr, "must have");
167 return adapter()->get_c2i_unverified_entry();
168 }
169
170 address Method::get_c2i_unverified_inline_entry() {
171 assert(adapter() != nullptr, "must have");
172 return adapter()->get_c2i_unverified_inline_entry();
173 }
174
175 address Method::get_c2i_no_clinit_check_entry() {
176 assert(VM_Version::supports_fast_class_init_checks(), "");
177 assert(adapter() != nullptr, "must have");
178 return adapter()->get_c2i_no_clinit_check_entry();
179 }
180
181 char* Method::name_and_sig_as_C_string() const {
182 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
183 }
184
185 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
186 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
187 }
188
189 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
190 const char* klass_name = klass->external_name();
191 int klass_name_len = (int)strlen(klass_name);
192 int method_name_len = method_name->utf8_length();
193 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
194 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
195 strcpy(dest, klass_name);
196 dest[klass_name_len] = '.';
197 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
198 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
199 dest[len] = 0;
200 return dest;
201 }
202
203 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
204 Symbol* klass_name = klass->name();
205 klass_name->as_klass_external_name(buf, size);
206 int len = (int)strlen(buf);
207
208 if (len < size - 1) {
209 buf[len++] = '.';
210
211 method_name->as_C_string(&(buf[len]), size - len);
212 len = (int)strlen(buf);
213
214 signature->as_C_string(&(buf[len]), size - len);
215 }
216
217 return buf;
218 }
219
220 const char* Method::external_name() const {
221 return external_name(constants()->pool_holder(), name(), signature());
222 }
223
224 void Method::print_external_name(outputStream *os) const {
225 print_external_name(os, constants()->pool_holder(), name(), signature());
226 }
227
228 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
229 stringStream ss;
230 print_external_name(&ss, klass, method_name, signature);
231 return ss.as_string();
232 }
233
234 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
235 signature->print_as_signature_external_return_type(os);
236 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
237 signature->print_as_signature_external_parameters(os);
238 os->print(")");
239 }
240
241 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
242 if (log_is_enabled(Debug, exceptions)) {
243 ResourceMark rm(THREAD);
244 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
245 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
246 }
247 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
248 // access exception table
249 ExceptionTable table(mh());
250 int length = table.length();
251 // iterate through all entries sequentially
252 constantPoolHandle pool(THREAD, mh->constants());
253 for (int i = 0; i < length; i ++) {
254 //reacquire the table in case a GC happened
255 ExceptionTable table(mh());
256 int beg_bci = table.start_pc(i);
257 int end_bci = table.end_pc(i);
258 assert(beg_bci <= end_bci, "inconsistent exception table");
259 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
260 beg_bci, end_bci);
261
262 if (beg_bci <= throw_bci && throw_bci < end_bci) {
263 // exception handler bci range covers throw_bci => investigate further
264 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
265
266 int handler_bci = table.handler_pc(i);
267 int klass_index = table.catch_type_index(i);
268 if (klass_index == 0) {
269 if (log_is_enabled(Info, exceptions)) {
270 ResourceMark rm(THREAD);
271 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
272 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
273 }
274 return handler_bci;
275 } else if (ex_klass == nullptr) {
276 // Is this even possible?
277 if (log_is_enabled(Info, exceptions)) {
278 ResourceMark rm(THREAD);
279 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
280 mh()->name()->as_C_string(), handler_bci);
281 }
282 return handler_bci;
283 } else {
284 if (log_is_enabled(Debug, exceptions)) {
285 ResourceMark rm(THREAD);
286 log_debug(exceptions)(" - resolving catch type \"%s\"",
287 pool->klass_name_at(klass_index)->as_C_string());
288 }
289 // we know the exception class => get the constraint class
290 // this may require loading of the constraint class; if verification
291 // fails or some other exception occurs, return handler_bci
292 Klass* k = pool->klass_at(klass_index, THREAD);
293 if (HAS_PENDING_EXCEPTION) {
294 if (log_is_enabled(Debug, exceptions)) {
295 ResourceMark rm(THREAD);
296 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
297 PENDING_EXCEPTION->klass()->external_name());
298 }
299 return handler_bci;
300 }
301 assert(k != nullptr, "klass not loaded");
302 if (ex_klass->is_subtype_of(k)) {
303 if (log_is_enabled(Info, exceptions)) {
304 ResourceMark rm(THREAD);
305 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
306 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
307 }
308 return handler_bci;
309 }
310 }
311 }
312 }
313
314 if (log_is_enabled(Debug, exceptions)) {
315 ResourceMark rm(THREAD);
316 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
317 ex_klass->external_name(), mh->name()->as_C_string());
318 }
319
320 return -1;
321 }
322
323 void Method::mask_for(int bci, InterpreterOopMap* mask) {
324 methodHandle h_this(Thread::current(), this);
325 mask_for(h_this, bci, mask);
326 }
327
328 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
329 assert(this_mh() == this, "Sanity");
330 method_holder()->mask_for(this_mh, bci, mask);
331 }
332
333 int Method::bci_from(address bcp) const {
334 if (is_native() && bcp == nullptr) {
335 return 0;
336 }
337 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
338 // may call this after interrupting a nested ResourceMark.
339 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
340 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
341
342 return int(bcp - code_base());
343 }
344
345
346 int Method::validate_bci(int bci) const {
347 // Called from the verifier, and should return -1 if not valid.
348 return ((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size())) ? bci : -1;
349 }
350
351 // Return bci if it appears to be a valid bcp
352 // Return -1 otherwise.
353 // Used by profiling code, when invalid data is a possibility.
354 // The caller is responsible for validating the Method* itself.
355 int Method::validate_bci_from_bcp(address bcp) const {
356 // keep bci as -1 if not a valid bci
357 int bci = -1;
358 if (bcp == nullptr || bcp == code_base()) {
359 // code_size() may return 0 and we allow 0 here
360 // the method may be native
361 bci = 0;
362 } else if (contains(bcp)) {
363 bci = int(bcp - code_base());
364 }
365 // Assert that if we have dodged any asserts, bci is negative.
366 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
367 return bci;
368 }
369
370 address Method::bcp_from(int bci) const {
371 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
372 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
373 address bcp = code_base() + bci;
374 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method");
375 return bcp;
376 }
377
378 address Method::bcp_from(address bcp) const {
379 if (is_native() && bcp == nullptr) {
380 return code_base();
381 } else {
382 return bcp;
383 }
384 }
385
386 int Method::size(bool is_native) {
387 // If native, then include pointers for native_function and signature_handler
388 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
389 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
390 return align_metadata_size(header_size() + extra_words);
391 }
392
393 Symbol* Method::klass_name() const {
394 return method_holder()->name();
395 }
396
397 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
398 log_trace(cds)("Iter(Method): %p", this);
399
400 if (!method_holder()->is_rewritten() || CDSConfig::is_valhalla_preview()) {
401 it->push(&_constMethod, MetaspaceClosure::_writable);
402 } else {
403 it->push(&_constMethod);
404 }
405 it->push(&_method_data);
406 it->push(&_method_counters);
407 NOT_PRODUCT(it->push(&_name);)
408 }
409
410 #if INCLUDE_CDS
411 // Attempt to return method to original state. Clear any pointers
412 // (to objects outside the shared spaces). We won't be able to predict
413 // where they should point in a new JVM. Further initialize some
414 // entries now in order allow them to be write protected later.
415
416 void Method::remove_unshareable_info() {
417 unlink_method();
418 JFR_ONLY(REMOVE_METHOD_ID(this);)
419 }
420
421 void Method::restore_unshareable_info(TRAPS) {
422 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
423 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set");
424 }
425 #endif
426
427 void Method::set_vtable_index(int index) {
428 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
429 // At runtime initialize_vtable is rerun as part of link_class_impl()
430 // for a shared class loaded by the non-boot loader to obtain the loader
431 // constraints based on the runtime classloaders' context.
432 return; // don't write into the shared class
433 } else {
434 _vtable_index = index;
435 }
436 }
437
438 void Method::set_itable_index(int index) {
439 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
440 // At runtime initialize_itable is rerun as part of link_class_impl()
441 // for a shared class loaded by the non-boot loader to obtain the loader
442 // constraints based on the runtime classloaders' context. The dumptime
443 // itable index should be the same as the runtime index.
444 assert(_vtable_index == itable_index_max - index,
445 "archived itable index is different from runtime index");
446 return; // don’t write into the shared class
447 } else {
448 _vtable_index = itable_index_max - index;
449 }
450 assert(valid_itable_index(), "");
451 }
452
453 // The RegisterNatives call being attempted tried to register with a method that
454 // is not native. Ask JVM TI what prefixes have been specified. Then check
455 // to see if the native method is now wrapped with the prefixes. See the
456 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
457 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
458 #if INCLUDE_JVMTI
459 ResourceMark rm(THREAD);
460 Method* method;
461 int name_len = name->utf8_length();
462 char* name_str = name->as_utf8();
463 int prefix_count;
464 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
465 for (int i = 0; i < prefix_count; i++) {
466 char* prefix = prefixes[i];
467 int prefix_len = (int)strlen(prefix);
468
469 // try adding this prefix to the method name and see if it matches another method name
470 int trial_len = name_len + prefix_len;
471 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
472 strcpy(trial_name_str, prefix);
473 strcat(trial_name_str, name_str);
474 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
475 if (trial_name == nullptr) {
476 continue; // no such symbol, so this prefix wasn't used, try the next prefix
477 }
478 method = k->lookup_method(trial_name, signature);
479 if (method == nullptr) {
480 continue; // signature doesn't match, try the next prefix
481 }
482 if (method->is_native()) {
483 method->set_is_prefixed_native();
484 return method; // wahoo, we found a prefixed version of the method, return it
485 }
486 // found as non-native, so prefix is good, add it, probably just need more prefixes
487 name_len = trial_len;
488 name_str = trial_name_str;
489 }
490 #endif // INCLUDE_JVMTI
491 return nullptr; // not found
492 }
493
494 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
495 Method* method = k->lookup_method(name, signature);
496 if (method == nullptr) {
497 ResourceMark rm(THREAD);
498 stringStream st;
499 st.print("Method '");
500 print_external_name(&st, k, name, signature);
501 st.print("' name or signature does not match");
502 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
503 }
504 if (!method->is_native()) {
505 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
506 method = find_prefixed_native(k, name, signature, THREAD);
507 if (method == nullptr) {
508 ResourceMark rm(THREAD);
509 stringStream st;
510 st.print("Method '");
511 print_external_name(&st, k, name, signature);
512 st.print("' is not declared as native");
513 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
514 }
515 }
516
517 if (entry != nullptr) {
518 method->set_native_function(entry, native_bind_event_is_interesting);
519 } else {
520 method->clear_native_function();
521 }
522 if (log_is_enabled(Debug, jni, resolve)) {
523 ResourceMark rm(THREAD);
524 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
525 method->method_holder()->external_name(),
526 method->name()->as_C_string());
527 }
528 return true;
529 }
530
531 bool Method::was_executed_more_than(int n) {
532 // Invocation counter is reset when the Method* is compiled.
533 // If the method has compiled code we therefore assume it has
534 // be executed more than n times.
535 if (is_accessor() || is_empty_method() || (code() != nullptr)) {
536 // interpreter doesn't bump invocation counter of trivial methods
537 // compiler does not bump invocation counter of compiled methods
538 return true;
539 }
540 else if ((method_counters() != nullptr &&
541 method_counters()->invocation_counter()->carry()) ||
542 (method_data() != nullptr &&
543 method_data()->invocation_counter()->carry())) {
544 // The carry bit is set when the counter overflows and causes
545 // a compilation to occur. We don't know how many times
546 // the counter has been reset, so we simply assume it has
547 // been executed more than n times.
548 return true;
549 } else {
550 return invocation_count() > n;
551 }
552 }
553
554 void Method::print_invocation_count(outputStream* st) {
555 //---< compose+print method return type, klass, name, and signature >---
556 if (is_static()) { st->print("static "); }
557 if (is_final()) { st->print("final "); }
558 if (is_synchronized()) { st->print("synchronized "); }
559 if (is_native()) { st->print("native "); }
560 st->print("%s::", method_holder()->external_name());
561 name()->print_symbol_on(st);
562 signature()->print_symbol_on(st);
563
564 if (WizardMode) {
565 // dump the size of the byte codes
566 st->print(" {%d}", code_size());
567 }
568 st->cr();
569
570 // Counting based on signed int counters tends to overflow with
571 // longer-running workloads on fast machines. The counters under
572 // consideration here, however, are limited in range by counting
573 // logic. See InvocationCounter:count_limit for example.
574 // No "overflow precautions" need to be implemented here.
575 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
576 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
577 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
578
579 if (method_data() != nullptr) {
580 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
581 }
582
583 #ifndef PRODUCT
584 if (CountCompiledCalls) {
585 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
586 }
587 #endif
588 }
589
590 // Build a MethodData* object to hold profiling information collected on this
591 // method when requested.
592 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
593 // Do not profile the method if metaspace has hit an OOM previously
594 // allocating profiling data. Callers clear pending exception so don't
595 // add one here.
596 if (ClassLoaderDataGraph::has_metaspace_oom()) {
597 return;
598 }
599
600 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
601 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
602 if (HAS_PENDING_EXCEPTION) {
603 CompileBroker::log_metaspace_failure();
604 ClassLoaderDataGraph::set_metaspace_oom(true);
605 return; // return the exception (which is cleared)
606 }
607
608 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
609 MetadataFactory::free_metadata(loader_data, method_data);
610 return;
611 }
612
613 if (PrintMethodData && (Verbose || WizardMode)) {
614 ResourceMark rm(THREAD);
615 tty->print("build_profiling_method_data for ");
616 method->print_name(tty);
617 tty->cr();
618 // At the end of the run, the MDO, full of data, will be dumped.
619 }
620 }
621
622 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
623 // Do not profile the method if metaspace has hit an OOM previously
624 if (ClassLoaderDataGraph::has_metaspace_oom()) {
625 return nullptr;
626 }
627
628 methodHandle mh(current, m);
629 MethodCounters* counters;
630 if (current->is_Java_thread()) {
631 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
632 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
633 // if needed.
634 counters = MethodCounters::allocate_with_exception(mh, THREAD);
635 if (HAS_PENDING_EXCEPTION) {
636 CLEAR_PENDING_EXCEPTION;
637 }
638 } else {
639 // Call metaspace allocation that doesn't throw exception if the
640 // current thread isn't a JavaThread, ie. the VMThread.
641 counters = MethodCounters::allocate_no_exception(mh);
642 }
643
644 if (counters == nullptr) {
645 CompileBroker::log_metaspace_failure();
646 ClassLoaderDataGraph::set_metaspace_oom(true);
647 return nullptr;
648 }
649
650 if (!mh->init_method_counters(counters)) {
651 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
652 }
653
654 return mh->method_counters();
655 }
656
657 bool Method::init_method_counters(MethodCounters* counters) {
658 // Try to install a pointer to MethodCounters, return true on success.
659 return Atomic::replace_if_null(&_method_counters, counters);
660 }
661
662 void Method::set_exception_handler_entered(int handler_bci) {
663 if (ProfileExceptionHandlers) {
664 MethodData* mdo = method_data();
665 if (mdo != nullptr) {
666 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci);
667 handler_data.set_exception_handler_entered();
668 }
669 }
670 }
671
672 int Method::extra_stack_words() {
673 // not an inline function, to avoid a header dependency on Interpreter
674 return extra_stack_entries() * Interpreter::stackElementSize;
675 }
676
677 // InlineKlass the method is declared to return. This must not
678 // safepoint as it is called with references live on the stack at
679 // locations the GC is unaware of.
680 InlineKlass* Method::returns_inline_type(Thread* thread) const {
681 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
682 if (is_native()) {
683 return nullptr;
684 }
685 NoSafepointVerifier nsv;
686 SignatureStream ss(signature());
687 while (!ss.at_return_type()) {
688 ss.next();
689 }
690 return ss.as_inline_klass(method_holder());
691 }
692
693 bool Method::compute_has_loops_flag() {
694 BytecodeStream bcs(methodHandle(Thread::current(), this));
695 Bytecodes::Code bc;
696
697 while ((bc = bcs.next()) >= 0) {
698 switch (bc) {
699 case Bytecodes::_ifeq:
700 case Bytecodes::_ifnull:
701 case Bytecodes::_iflt:
702 case Bytecodes::_ifle:
703 case Bytecodes::_ifne:
704 case Bytecodes::_ifnonnull:
705 case Bytecodes::_ifgt:
706 case Bytecodes::_ifge:
707 case Bytecodes::_if_icmpeq:
708 case Bytecodes::_if_icmpne:
709 case Bytecodes::_if_icmplt:
710 case Bytecodes::_if_icmpgt:
711 case Bytecodes::_if_icmple:
712 case Bytecodes::_if_icmpge:
713 case Bytecodes::_if_acmpeq:
714 case Bytecodes::_if_acmpne:
715 case Bytecodes::_goto:
716 case Bytecodes::_jsr:
717 if (bcs.dest() < bcs.next_bci()) {
718 return set_has_loops();
719 }
720 break;
721
722 case Bytecodes::_goto_w:
723 case Bytecodes::_jsr_w:
724 if (bcs.dest_w() < bcs.next_bci()) {
725 return set_has_loops();
726 }
727 break;
728
729 case Bytecodes::_lookupswitch: {
730 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
731 if (lookupswitch.default_offset() < 0) {
732 return set_has_loops();
733 } else {
734 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
735 LookupswitchPair pair = lookupswitch.pair_at(i);
736 if (pair.offset() < 0) {
737 return set_has_loops();
738 }
739 }
740 }
741 break;
742 }
743 case Bytecodes::_tableswitch: {
744 Bytecode_tableswitch tableswitch(this, bcs.bcp());
745 if (tableswitch.default_offset() < 0) {
746 return set_has_loops();
747 } else {
748 for (int i = 0; i < tableswitch.length(); ++i) {
749 if (tableswitch.dest_offset_at(i) < 0) {
750 return set_has_loops();
751 }
752 }
753 }
754 break;
755 }
756 default:
757 break;
758 }
759 }
760
761 _flags.set_has_loops_flag_init(true);
762 return false;
763 }
764
765 bool Method::is_final_method(AccessFlags class_access_flags) const {
766 // or "does_not_require_vtable_entry"
767 // default method or overpass can occur, is not final (reuses vtable entry)
768 // private methods in classes get vtable entries for backward class compatibility.
769 if (is_overpass() || is_default_method()) return false;
770 return is_final() || class_access_flags.is_final();
771 }
772
773 bool Method::is_final_method() const {
774 return is_final_method(method_holder()->access_flags());
775 }
776
777 bool Method::is_default_method() const {
778 if (method_holder() != nullptr &&
779 method_holder()->is_interface() &&
780 !is_abstract() && !is_private()) {
781 return true;
782 } else {
783 return false;
784 }
785 }
786
787 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
788 if (is_final_method(class_access_flags)) return true;
789 #ifdef ASSERT
790 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
791 if (class_access_flags.is_interface()) {
792 ResourceMark rm;
793 assert(is_nonv == is_static() || is_nonv == is_private(),
794 "nonvirtual unexpected for non-static, non-private: %s",
795 name_and_sig_as_C_string());
796 }
797 #endif
798 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
799 return vtable_index() == nonvirtual_vtable_index;
800 }
801
802 bool Method::can_be_statically_bound() const {
803 return can_be_statically_bound(method_holder()->access_flags());
804 }
805
806 bool Method::can_be_statically_bound(InstanceKlass* context) const {
807 return (method_holder() == context) && can_be_statically_bound();
808 }
809
810 /**
811 * Returns false if this is one of specially treated methods for
812 * which we have to provide stack trace in throw in compiled code.
813 * Returns true otherwise.
814 */
815 bool Method::can_omit_stack_trace() {
816 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
817 return false; // All methods in sun.invoke.util.ValueConversions
818 }
819 return true;
820 }
821
822 bool Method::is_accessor() const {
823 return is_getter() || is_setter();
824 }
825
826 bool Method::is_getter() const {
827 if (code_size() != 5) return false;
828 if (size_of_parameters() != 1) return false;
829 if (java_code_at(0) != Bytecodes::_aload_0) return false;
830 if (java_code_at(1) != Bytecodes::_getfield) return false;
831 switch (java_code_at(4)) {
832 case Bytecodes::_ireturn:
833 case Bytecodes::_lreturn:
834 case Bytecodes::_freturn:
835 case Bytecodes::_dreturn:
836 case Bytecodes::_areturn:
837 break;
838 default:
839 return false;
840 }
841 if (has_scalarized_return()) {
842 // Don't treat this as (trivial) getter method because the
843 // inline type should be returned in a scalarized form.
844 return false;
845 }
846 return true;
847 }
848
849 bool Method::is_setter() const {
850 if (code_size() != 6) return false;
851 if (java_code_at(0) != Bytecodes::_aload_0) return false;
852 switch (java_code_at(1)) {
853 case Bytecodes::_iload_1:
854 case Bytecodes::_aload_1:
855 case Bytecodes::_fload_1:
856 if (size_of_parameters() != 2) return false;
857 break;
858 case Bytecodes::_dload_1:
859 case Bytecodes::_lload_1:
860 if (size_of_parameters() != 3) return false;
861 break;
862 default:
863 return false;
864 }
865 if (java_code_at(2) != Bytecodes::_putfield) return false;
866 if (java_code_at(5) != Bytecodes::_return) return false;
867 if (has_scalarized_args()) {
868 // Don't treat this as (trivial) setter method because the
869 // inline type argument should be passed in a scalarized form.
870 return false;
871 }
872 return true;
873 }
874
875 bool Method::is_constant_getter() const {
876 int last_index = code_size() - 1;
877 // Check if the first 1-3 bytecodes are a constant push
878 // and the last bytecode is a return.
879 return (2 <= code_size() && code_size() <= 4 &&
880 Bytecodes::is_const(java_code_at(0)) &&
881 Bytecodes::length_for(java_code_at(0)) == last_index &&
882 Bytecodes::is_return(java_code_at(last_index)) &&
883 !has_scalarized_args());
884 }
885
886 bool Method::is_class_initializer() const {
887 // For classfiles version 51 or greater, ensure that the clinit method is
888 // static. Non-static methods with the name "<clinit>" are not static
889 // initializers. (older classfiles exempted for backward compatibility)
890 return (name() == vmSymbols::class_initializer_name() &&
891 (is_static() ||
892 method_holder()->major_version() < 51));
893 }
894
895 // A method named <init>, is a classic object constructor.
896 bool Method::is_object_constructor() const {
897 return name() == vmSymbols::object_initializer_name();
898 }
899
900 bool Method::needs_clinit_barrier() const {
901 return is_static() && !method_holder()->is_initialized();
902 }
903
904 bool Method::is_object_wait0() const {
905 return klass_name() == vmSymbols::java_lang_Object()
906 && name() == vmSymbols::wait_name();
907 }
908
909 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
910 int length = method->checked_exceptions_length();
911 if (length == 0) { // common case
912 return objArrayHandle(THREAD, Universe::the_empty_class_array());
913 } else {
914 methodHandle h_this(THREAD, method);
915 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
916 objArrayHandle mirrors (THREAD, m_oop);
917 for (int i = 0; i < length; i++) {
918 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
919 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
920 if (log_is_enabled(Warning, exceptions) &&
921 !k->is_subclass_of(vmClasses::Throwable_klass())) {
922 ResourceMark rm(THREAD);
923 log_warning(exceptions)(
924 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
925 k->external_name(), method->external_name());
926 }
927 mirrors->obj_at_put(i, k->java_mirror());
928 }
929 return mirrors;
930 }
931 };
932
933
934 int Method::line_number_from_bci(int bci) const {
935 int best_bci = 0;
936 int best_line = -1;
937 if (bci == SynchronizationEntryBCI) bci = 0;
938 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
939 // The line numbers are a short array of 2-tuples [start_pc, line_number].
940 // Not necessarily sorted and not necessarily one-to-one.
941 CompressedLineNumberReadStream stream(compressed_linenumber_table());
942 while (stream.read_pair()) {
943 if (stream.bci() == bci) {
944 // perfect match
945 return stream.line();
946 } else {
947 // update best_bci/line
948 if (stream.bci() < bci && stream.bci() >= best_bci) {
949 best_bci = stream.bci();
950 best_line = stream.line();
951 }
952 }
953 }
954 }
955 return best_line;
956 }
957
958
959 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
960 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
961 Thread *thread = Thread::current();
962 Symbol* klass_name = constants()->klass_name_at(klass_index);
963 Handle loader(thread, method_holder()->class_loader());
964 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr;
965 } else {
966 return true;
967 }
968 }
969
970
971 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
972 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
973 if (must_be_resolved) {
974 // Make sure klass is resolved in constantpool.
975 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
976 return false;
977 }
978 }
979 return is_klass_loaded_by_klass_index(klass_index);
980 }
981
982
983 void Method::set_native_function(address function, bool post_event_flag) {
984 assert(function != nullptr, "use clear_native_function to unregister natives");
985 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
986 address* native_function = native_function_addr();
987
988 // We can see racers trying to place the same native function into place. Once
989 // is plenty.
990 address current = *native_function;
991 if (current == function) return;
992 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
993 function != nullptr) {
994 // native_method_throw_unsatisfied_link_error_entry() should only
995 // be passed when post_event_flag is false.
996 assert(function !=
997 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
998 "post_event_flag mismatch");
999
1000 // post the bind event, and possible change the bind function
1001 JvmtiExport::post_native_method_bind(this, &function);
1002 }
1003 *native_function = function;
1004 // This function can be called more than once. We must make sure that we always
1005 // use the latest registered method -> check if a stub already has been generated.
1006 // If so, we have to make it not_entrant.
1007 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1008 if (nm != nullptr) {
1009 nm->make_not_entrant("set native function");
1010 }
1011 }
1012
1013
1014 bool Method::has_native_function() const {
1015 if (is_special_native_intrinsic())
1016 return false; // special-cased in SharedRuntime::generate_native_wrapper
1017 address func = native_function();
1018 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1019 }
1020
1021
1022 void Method::clear_native_function() {
1023 // Note: is_method_handle_intrinsic() is allowed here.
1024 set_native_function(
1025 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1026 !native_bind_event_is_interesting);
1027 this->unlink_code();
1028 }
1029
1030
1031 void Method::set_signature_handler(address handler) {
1032 address* signature_handler = signature_handler_addr();
1033 *signature_handler = handler;
1034 }
1035
1036
1037 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1038 assert(reason != nullptr, "must provide a reason");
1039 if (PrintCompilation && report) {
1040 ttyLocker ttyl;
1041 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1042 if (comp_level == CompLevel_all) {
1043 tty->print("all levels ");
1044 } else {
1045 tty->print("level %d ", comp_level);
1046 }
1047 this->print_short_name(tty);
1048 int size = this->code_size();
1049 if (size > 0) {
1050 tty->print(" (%d bytes)", size);
1051 }
1052 if (reason != nullptr) {
1053 tty->print(" %s", reason);
1054 }
1055 tty->cr();
1056 }
1057 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1058 ttyLocker ttyl;
1059 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'",
1060 os::current_thread_id(), is_osr, comp_level);
1061 if (reason != nullptr) {
1062 xtty->print(" reason=\'%s\'", reason);
1063 }
1064 xtty->method(this);
1065 xtty->stamp();
1066 xtty->end_elem();
1067 }
1068 }
1069
1070 bool Method::is_always_compilable() const {
1071 // Generated adapters must be compiled
1072 if (is_special_native_intrinsic() && is_synthetic()) {
1073 assert(!is_not_c1_compilable(), "sanity check");
1074 assert(!is_not_c2_compilable(), "sanity check");
1075 return true;
1076 }
1077
1078 return false;
1079 }
1080
1081 bool Method::is_not_compilable(int comp_level) const {
1082 if (number_of_breakpoints() > 0)
1083 return true;
1084 if (is_always_compilable())
1085 return false;
1086 if (comp_level == CompLevel_any)
1087 return is_not_c1_compilable() && is_not_c2_compilable();
1088 if (is_c1_compile(comp_level))
1089 return is_not_c1_compilable();
1090 if (is_c2_compile(comp_level))
1091 return is_not_c2_compilable();
1092 return false;
1093 }
1094
1095 // call this when compiler finds that this method is not compilable
1096 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1097 if (is_always_compilable()) {
1098 // Don't mark a method which should be always compilable
1099 return;
1100 }
1101 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1102 if (comp_level == CompLevel_all) {
1103 set_is_not_c1_compilable();
1104 set_is_not_c2_compilable();
1105 } else {
1106 if (is_c1_compile(comp_level))
1107 set_is_not_c1_compilable();
1108 if (is_c2_compile(comp_level))
1109 set_is_not_c2_compilable();
1110 }
1111 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1112 }
1113
1114 bool Method::is_not_osr_compilable(int comp_level) const {
1115 if (is_not_compilable(comp_level))
1116 return true;
1117 if (comp_level == CompLevel_any)
1118 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1119 if (is_c1_compile(comp_level))
1120 return is_not_c1_osr_compilable();
1121 if (is_c2_compile(comp_level))
1122 return is_not_c2_osr_compilable();
1123 return false;
1124 }
1125
1126 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1127 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1128 if (comp_level == CompLevel_all) {
1129 set_is_not_c1_osr_compilable();
1130 set_is_not_c2_osr_compilable();
1131 } else {
1132 if (is_c1_compile(comp_level))
1133 set_is_not_c1_osr_compilable();
1134 if (is_c2_compile(comp_level))
1135 set_is_not_c2_osr_compilable();
1136 }
1137 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1138 }
1139
1140 // Revert to using the interpreter and clear out the nmethod
1141 void Method::clear_code() {
1142 // this may be null if c2i adapters have not been made yet
1143 // Only should happen at allocate time.
1144 if (adapter() == nullptr) {
1145 _from_compiled_entry = nullptr;
1146 _from_compiled_inline_entry = nullptr;
1147 _from_compiled_inline_ro_entry = nullptr;
1148 } else {
1149 _from_compiled_entry = adapter()->get_c2i_entry();
1150 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1151 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1152 }
1153 OrderAccess::storestore();
1154 _from_interpreted_entry = _i2i_entry;
1155 OrderAccess::storestore();
1156 _code = nullptr;
1157 }
1158
1159 void Method::unlink_code(nmethod *compare) {
1160 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1161 // We need to check if either the _code or _from_compiled_code_entry_point
1162 // refer to this nmethod because there is a race in setting these two fields
1163 // in Method* as seen in bugid 4947125.
1164 if (code() == compare ||
1165 from_compiled_entry() == compare->verified_entry_point()) {
1166 clear_code();
1167 }
1168 }
1169
1170 void Method::unlink_code() {
1171 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1172 clear_code();
1173 }
1174
1175 #if INCLUDE_CDS
1176 // Called by class data sharing to remove any entry points (which are not shared)
1177 void Method::unlink_method() {
1178 assert(CDSConfig::is_dumping_archive(), "sanity");
1179 _code = nullptr;
1180 _adapter = nullptr;
1181 _i2i_entry = nullptr;
1182 _from_compiled_entry = nullptr;
1183 _from_compiled_inline_entry = nullptr;
1184 _from_compiled_inline_ro_entry = nullptr;
1185 _from_interpreted_entry = nullptr;
1186
1187 if (is_native()) {
1188 *native_function_addr() = nullptr;
1189 set_signature_handler(nullptr);
1190 }
1191 NOT_PRODUCT(set_compiled_invocation_count(0);)
1192
1193 clear_method_data();
1194 clear_method_counters();
1195 remove_unshareable_flags();
1196 }
1197
1198 void Method::remove_unshareable_flags() {
1199 // clear all the flags that shouldn't be in the archived version
1200 assert(!is_old(), "must be");
1201 assert(!is_obsolete(), "must be");
1202 assert(!is_deleted(), "must be");
1203
1204 set_is_prefixed_native(false);
1205 set_queued_for_compilation(false);
1206 set_is_not_c2_compilable(false);
1207 set_is_not_c1_compilable(false);
1208 set_is_not_c2_osr_compilable(false);
1209 set_on_stack_flag(false);
1210 set_has_scalarized_args(false);
1211 set_has_scalarized_return(false);
1212 }
1213 #endif
1214
1215 // Called when the method_holder is getting linked. Setup entrypoints so the method
1216 // is ready to be called from interpreter, compiler, and vtables.
1217 void Method::link_method(const methodHandle& h_method, TRAPS) {
1218 if (log_is_enabled(Info, perf, class, link)) {
1219 ClassLoader::perf_ik_link_methods_count()->inc();
1220 }
1221
1222 // If the code cache is full, we may reenter this function for the
1223 // leftover methods that weren't linked.
1224 if (adapter() != nullptr) {
1225 return;
1226 }
1227 assert( _code == nullptr, "nothing compiled yet" );
1228
1229 // Setup interpreter entrypoint
1230 assert(this == h_method(), "wrong h_method()" );
1231
1232 assert(adapter() == nullptr, "init'd to null");
1233 address entry = Interpreter::entry_for_method(h_method);
1234 assert(entry != nullptr, "interpreter entry must be non-null");
1235 // Sets both _i2i_entry and _from_interpreted_entry
1236 set_interpreter_entry(entry);
1237
1238 // Don't overwrite already registered native entries.
1239 if (is_native() && !has_native_function()) {
1240 set_native_function(
1241 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1242 !native_bind_event_is_interesting);
1243 }
1244 if (InlineTypeReturnedAsFields && returns_inline_type(THREAD) && !has_scalarized_return()) {
1245 set_has_scalarized_return();
1246 }
1247
1248 // Setup compiler entrypoint. This is made eagerly, so we do not need
1249 // special handling of vtables. An alternative is to make adapters more
1250 // lazily by calling make_adapter() from from_compiled_entry() for the
1251 // normal calls. For vtable calls life gets more complicated. When a
1252 // call-site goes mega-morphic we need adapters in all methods which can be
1253 // called from the vtable. We need adapters on such methods that get loaded
1254 // later. Ditto for mega-morphic itable calls. If this proves to be a
1255 // problem we'll make these lazily later.
1256 (void) make_adapters(h_method, CHECK);
1257
1258 // ONLY USE the h_method now as make_adapter may have blocked
1259
1260 if (h_method->is_continuation_native_intrinsic()) {
1261 _from_interpreted_entry = nullptr;
1262 _from_compiled_entry = nullptr;
1263 _i2i_entry = nullptr;
1264 if (Continuations::enabled()) {
1265 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1266 AdapterHandlerLibrary::create_native_wrapper(h_method);
1267 if (!h_method->has_compiled_code()) {
1268 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1269 }
1270 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1271 }
1272 }
1273 }
1274
1275 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1276 PerfTraceTime timer(ClassLoader::perf_method_adapters_time());
1277
1278 // Adapters for compiled code are made eagerly here. They are fairly
1279 // small (generally < 100 bytes) and quick to make (and cached and shared)
1280 // so making them eagerly shouldn't be too expensive.
1281 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1282 if (adapter == nullptr ) {
1283 if (!is_init_completed()) {
1284 // Don't throw exceptions during VM initialization because java.lang.* classes
1285 // might not have been initialized, causing problems when constructing the
1286 // Java exception object.
1287 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1288 } else {
1289 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1290 }
1291 }
1292
1293 mh->set_adapter_entry(adapter);
1294 mh->_from_compiled_entry = adapter->get_c2i_entry();
1295 mh->_from_compiled_inline_entry = adapter->get_c2i_inline_entry();
1296 mh->_from_compiled_inline_ro_entry = adapter->get_c2i_inline_ro_entry();
1297 return adapter->get_c2i_entry();
1298 }
1299
1300 // The verified_code_entry() must be called when a invoke is resolved
1301 // on this method.
1302
1303 // It returns the compiled code entry point, after asserting not null.
1304 // This function is called after potential safepoints so that nmethod
1305 // or adapter that it points to is still live and valid.
1306 // This function must not hit a safepoint!
1307 address Method::verified_code_entry() {
1308 debug_only(NoSafepointVerifier nsv;)
1309 assert(_from_compiled_entry != nullptr, "must be set");
1310 return _from_compiled_entry;
1311 }
1312
1313 address Method::verified_inline_code_entry() {
1314 debug_only(NoSafepointVerifier nsv;)
1315 assert(_from_compiled_inline_entry != nullptr, "must be set");
1316 return _from_compiled_inline_entry;
1317 }
1318
1319 address Method::verified_inline_ro_code_entry() {
1320 debug_only(NoSafepointVerifier nsv;)
1321 assert(_from_compiled_inline_ro_entry != nullptr, "must be set");
1322 return _from_compiled_inline_ro_entry;
1323 }
1324
1325 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1326 // (could be racing a deopt).
1327 // Not inline to avoid circular ref.
1328 bool Method::check_code() const {
1329 // cached in a register or local. There's a race on the value of the field.
1330 nmethod *code = Atomic::load_acquire(&_code);
1331 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1332 }
1333
1334 // Install compiled code. Instantly it can execute.
1335 void Method::set_code(const methodHandle& mh, nmethod *code) {
1336 assert_lock_strong(NMethodState_lock);
1337 assert( code, "use clear_code to remove code" );
1338 assert( mh->check_code(), "" );
1339
1340 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1341
1342 // These writes must happen in this order, because the interpreter will
1343 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1344 // which jumps to _from_compiled_entry.
1345 mh->_code = code; // Assign before allowing compiled code to exec
1346
1347 int comp_level = code->comp_level();
1348 // In theory there could be a race here. In practice it is unlikely
1349 // and not worth worrying about.
1350 if (comp_level > mh->highest_comp_level()) {
1351 mh->set_highest_comp_level(comp_level);
1352 }
1353
1354 OrderAccess::storestore();
1355 mh->_from_compiled_entry = code->verified_entry_point();
1356 mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1357 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1358 OrderAccess::storestore();
1359
1360 if (mh->is_continuation_native_intrinsic()) {
1361 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1362
1363 if (mh->is_continuation_enter_intrinsic()) {
1364 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1365 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1366 } else if (mh->is_continuation_yield_intrinsic()) {
1367 mh->_i2i_entry = mh->get_i2c_entry();
1368 } else {
1369 guarantee(false, "Unknown Continuation native intrinsic");
1370 }
1371 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1372 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1373 } else if (!mh->is_method_handle_intrinsic()) {
1374 // Instantly compiled code can execute.
1375 mh->_from_interpreted_entry = mh->get_i2c_entry();
1376 }
1377 }
1378
1379
1380 bool Method::is_overridden_in(Klass* k) const {
1381 InstanceKlass* ik = InstanceKlass::cast(k);
1382
1383 if (ik->is_interface()) return false;
1384
1385 // If method is an interface, we skip it - except if it
1386 // is a miranda method
1387 if (method_holder()->is_interface()) {
1388 // Check that method is not a miranda method
1389 if (ik->lookup_method(name(), signature()) == nullptr) {
1390 // No implementation exist - so miranda method
1391 return false;
1392 }
1393 return true;
1394 }
1395
1396 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1397 if (!has_vtable_index()) {
1398 return false;
1399 } else {
1400 Method* vt_m = ik->method_at_vtable(vtable_index());
1401 return vt_m != this;
1402 }
1403 }
1404
1405
1406 // give advice about whether this Method* should be cached or not
1407 bool Method::should_not_be_cached() const {
1408 if (is_old()) {
1409 // This method has been redefined. It is either EMCP or obsolete
1410 // and we don't want to cache it because that would pin the method
1411 // down and prevent it from being collectible if and when it
1412 // finishes executing.
1413 return true;
1414 }
1415
1416 // caching this method should be just fine
1417 return false;
1418 }
1419
1420
1421 /**
1422 * Returns true if this is one of the specially treated methods for
1423 * security related stack walks (like Reflection.getCallerClass).
1424 */
1425 bool Method::is_ignored_by_security_stack_walk() const {
1426 if (intrinsic_id() == vmIntrinsics::_invoke) {
1427 // This is Method.invoke() -- ignore it
1428 return true;
1429 }
1430 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1431 // This is an auxiliary frame -- ignore it
1432 return true;
1433 }
1434 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1435 // This is an internal adapter frame for method handles -- ignore it
1436 return true;
1437 }
1438 return false;
1439 }
1440
1441
1442 // Constant pool structure for invoke methods:
1443 enum {
1444 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1445 _imcp_invoke_signature, // utf8: (variable Symbol*)
1446 _imcp_limit
1447 };
1448
1449 // Test if this method is an MH adapter frame generated by Java code.
1450 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1451 bool Method::is_compiled_lambda_form() const {
1452 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1453 }
1454
1455 // Test if this method is an internal MH primitive method.
1456 bool Method::is_method_handle_intrinsic() const {
1457 vmIntrinsics::ID iid = intrinsic_id();
1458 return (MethodHandles::is_signature_polymorphic(iid) &&
1459 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1460 }
1461
1462 bool Method::has_member_arg() const {
1463 vmIntrinsics::ID iid = intrinsic_id();
1464 return (MethodHandles::is_signature_polymorphic(iid) &&
1465 MethodHandles::has_member_arg(iid));
1466 }
1467
1468 // Make an instance of a signature-polymorphic internal MH primitive.
1469 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1470 Symbol* signature,
1471 TRAPS) {
1472 ResourceMark rm(THREAD);
1473 methodHandle empty;
1474
1475 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1476 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1477 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1478
1479 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1480
1481 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1482 name->increment_refcount();
1483 signature->increment_refcount();
1484
1485 int cp_length = _imcp_limit;
1486 ClassLoaderData* loader_data = holder->class_loader_data();
1487 constantPoolHandle cp;
1488 {
1489 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1490 cp = constantPoolHandle(THREAD, cp_oop);
1491 }
1492 cp->copy_fields(holder->constants());
1493 cp->set_pool_holder(holder);
1494 cp->symbol_at_put(_imcp_invoke_name, name);
1495 cp->symbol_at_put(_imcp_invoke_signature, signature);
1496 cp->set_has_preresolution();
1497 cp->set_is_for_method_handle_intrinsic();
1498
1499 // decide on access bits: public or not?
1500 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1501 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1502 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1503 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1504
1505 methodHandle m;
1506 {
1507 InlineTableSizes sizes;
1508 Method* m_oop = Method::allocate(loader_data, 0,
1509 accessFlags_from(flags_bits), &sizes,
1510 ConstMethod::NORMAL,
1511 name,
1512 CHECK_(empty));
1513 m = methodHandle(THREAD, m_oop);
1514 }
1515 m->set_constants(cp());
1516 m->set_name_index(_imcp_invoke_name);
1517 m->set_signature_index(_imcp_invoke_signature);
1518 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1519 assert(m->signature() == signature, "");
1520 m->constMethod()->compute_from_signature(signature, must_be_static);
1521 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1522 assert(m->is_method_handle_intrinsic(), "");
1523 #ifdef ASSERT
1524 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1525 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1526 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1527 #endif //ASSERT
1528
1529 // Finally, set up its entry points.
1530 assert(m->can_be_statically_bound(), "");
1531 m->set_vtable_index(Method::nonvirtual_vtable_index);
1532 m->link_method(m, CHECK_(empty));
1533
1534 if (iid == vmIntrinsics::_linkToNative) {
1535 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1536 }
1537 if (log_is_enabled(Debug, methodhandles)) {
1538 LogTarget(Debug, methodhandles) lt;
1539 LogStream ls(lt);
1540 m->print_on(&ls);
1541 }
1542
1543 return m;
1544 }
1545
1546 #if INCLUDE_CDS
1547 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) {
1548 m->link_method(m, CHECK);
1549
1550 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) {
1551 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1552 }
1553 }
1554 #endif
1555
1556 Klass* Method::check_non_bcp_klass(Klass* klass) {
1557 if (klass != nullptr && klass->class_loader() != nullptr) {
1558 if (klass->is_objArray_klass())
1559 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1560 return klass;
1561 }
1562 return nullptr;
1563 }
1564
1565
1566 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1567 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1568 // Code below does not work for native methods - they should never get rewritten anyway
1569 assert(!m->is_native(), "cannot rewrite native methods");
1570 // Allocate new Method*
1571 AccessFlags flags = m->access_flags();
1572
1573 ConstMethod* cm = m->constMethod();
1574 int checked_exceptions_len = cm->checked_exceptions_length();
1575 int localvariable_len = cm->localvariable_table_length();
1576 int exception_table_len = cm->exception_table_length();
1577 int method_parameters_len = cm->method_parameters_length();
1578 int method_annotations_len = cm->method_annotations_length();
1579 int parameter_annotations_len = cm->parameter_annotations_length();
1580 int type_annotations_len = cm->type_annotations_length();
1581 int default_annotations_len = cm->default_annotations_length();
1582
1583 InlineTableSizes sizes(
1584 localvariable_len,
1585 new_compressed_linenumber_size,
1586 exception_table_len,
1587 checked_exceptions_len,
1588 method_parameters_len,
1589 cm->generic_signature_index(),
1590 method_annotations_len,
1591 parameter_annotations_len,
1592 type_annotations_len,
1593 default_annotations_len,
1594 0);
1595
1596 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1597 Method* newm_oop = Method::allocate(loader_data,
1598 new_code_length,
1599 flags,
1600 &sizes,
1601 m->method_type(),
1602 m->name(),
1603 CHECK_(methodHandle()));
1604 methodHandle newm (THREAD, newm_oop);
1605
1606 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1607 ConstMethod* newcm = newm->constMethod();
1608 int new_const_method_size = newm->constMethod()->size();
1609
1610 // This works because the source and target are both Methods. Some compilers
1611 // (e.g., clang) complain that the target vtable pointer will be stomped,
1612 // so cast away newm()'s and m()'s Methodness.
1613 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1614
1615 // Create shallow copy of ConstMethod.
1616 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1617
1618 // Reset correct method/const method, method size, and parameter info
1619 newm->set_constMethod(newcm);
1620 newm->constMethod()->set_code_size(new_code_length);
1621 newm->constMethod()->set_constMethod_size(new_const_method_size);
1622 assert(newm->code_size() == new_code_length, "check");
1623 assert(newm->method_parameters_length() == method_parameters_len, "check");
1624 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1625 assert(newm->exception_table_length() == exception_table_len, "check");
1626 assert(newm->localvariable_table_length() == localvariable_len, "check");
1627 // Copy new byte codes
1628 memcpy(newm->code_base(), new_code, new_code_length);
1629 // Copy line number table
1630 if (new_compressed_linenumber_size > 0) {
1631 memcpy(newm->compressed_linenumber_table(),
1632 new_compressed_linenumber_table,
1633 new_compressed_linenumber_size);
1634 }
1635 // Copy method_parameters
1636 if (method_parameters_len > 0) {
1637 memcpy(newm->method_parameters_start(),
1638 m->method_parameters_start(),
1639 method_parameters_len * sizeof(MethodParametersElement));
1640 }
1641 // Copy checked_exceptions
1642 if (checked_exceptions_len > 0) {
1643 memcpy(newm->checked_exceptions_start(),
1644 m->checked_exceptions_start(),
1645 checked_exceptions_len * sizeof(CheckedExceptionElement));
1646 }
1647 // Copy exception table
1648 if (exception_table_len > 0) {
1649 memcpy(newm->exception_table_start(),
1650 m->exception_table_start(),
1651 exception_table_len * sizeof(ExceptionTableElement));
1652 }
1653 // Copy local variable number table
1654 if (localvariable_len > 0) {
1655 memcpy(newm->localvariable_table_start(),
1656 m->localvariable_table_start(),
1657 localvariable_len * sizeof(LocalVariableTableElement));
1658 }
1659 // Copy stackmap table
1660 if (m->has_stackmap_table()) {
1661 int code_attribute_length = m->stackmap_data()->length();
1662 Array<u1>* stackmap_data =
1663 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1664 memcpy((void*)stackmap_data->adr_at(0),
1665 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1666 newm->set_stackmap_data(stackmap_data);
1667 }
1668
1669 // copy annotations over to new method
1670 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1671 return newm;
1672 }
1673
1674 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1675 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1676 // because we are not loading from core libraries
1677 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1678 // which does not use the class default class loader so we check for its loader here
1679 const InstanceKlass* ik = InstanceKlass::cast(holder);
1680 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1681 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1682 }
1683
1684 // see if the klass name is well-known:
1685 Symbol* klass_name = ik->name();
1686 vmSymbolID id = vmSymbols::find_sid(klass_name);
1687 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1688 return id;
1689 } else {
1690 return vmSymbolID::NO_SID;
1691 }
1692 }
1693
1694 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1695 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1696 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1697 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1698 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1699
1700 // the klass name is well-known:
1701 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1702 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1703
1704 // ditto for method and signature:
1705 vmSymbolID name_id = vmSymbols::find_sid(name());
1706 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1707 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1708 && name_id == vmSymbolID::NO_SID) {
1709 return;
1710 }
1711 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1712 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1713 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1714 && sig_id == vmSymbolID::NO_SID) {
1715 return;
1716 }
1717
1718 u2 flags = access_flags().as_method_flags();
1719 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1720 if (id != vmIntrinsics::_none) {
1721 set_intrinsic_id(id);
1722 if (id == vmIntrinsics::_Class_cast) {
1723 // Even if the intrinsic is rejected, we want to inline this simple method.
1724 set_force_inline();
1725 }
1726 return;
1727 }
1728
1729 // A few slightly irregular cases:
1730 switch (klass_id) {
1731 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1732 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1733 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1734 if (!is_native()) break;
1735 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1736 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1737 id = vmIntrinsics::_none;
1738 break;
1739
1740 default:
1741 break;
1742 }
1743
1744 if (id != vmIntrinsics::_none) {
1745 // Set up its iid. It is an alias method.
1746 set_intrinsic_id(id);
1747 return;
1748 }
1749 }
1750
1751 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1752 if (!THREAD->can_call_java()) {
1753 // There is nothing useful this routine can do from within the Compile thread.
1754 // Hopefully, the signature contains only well-known classes.
1755 // We could scan for this and return true/false, but the caller won't care.
1756 return false;
1757 }
1758 bool sig_is_loaded = true;
1759 ResourceMark rm(THREAD);
1760 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1761 if (ss.is_reference()) {
1762 // load everything, including arrays "[Lfoo;"
1763 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1764 // We are loading classes eagerly. If a ClassNotFoundException or
1765 // a LinkageError was generated, be sure to ignore it.
1766 if (HAS_PENDING_EXCEPTION) {
1767 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1768 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1769 CLEAR_PENDING_EXCEPTION;
1770 } else {
1771 return false;
1772 }
1773 }
1774 if( klass == nullptr) { sig_is_loaded = false; }
1775 }
1776 }
1777 return sig_is_loaded;
1778 }
1779
1780 // Exposed so field engineers can debug VM
1781 void Method::print_short_name(outputStream* st) const {
1782 ResourceMark rm;
1783 #ifdef PRODUCT
1784 st->print(" %s::", method_holder()->external_name());
1785 #else
1786 st->print(" %s::", method_holder()->internal_name());
1787 #endif
1788 name()->print_symbol_on(st);
1789 if (WizardMode) signature()->print_symbol_on(st);
1790 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1791 MethodHandles::print_as_basic_type_signature_on(st, signature());
1792 }
1793
1794 // Comparer for sorting an object array containing
1795 // Method*s.
1796 static int method_comparator(Method* a, Method* b) {
1797 return a->name()->fast_compare(b->name());
1798 }
1799
1800 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1801 // default_methods also uses this without the ordering for fast find_method
1802 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1803 int length = methods->length();
1804 if (length > 1) {
1805 if (func == nullptr) {
1806 func = method_comparator;
1807 }
1808 {
1809 NoSafepointVerifier nsv;
1810 QuickSort::sort(methods->data(), length, func);
1811 }
1812 // Reset method ordering
1813 if (set_idnums) {
1814 for (u2 i = 0; i < length; i++) {
1815 Method* m = methods->at(i);
1816 m->set_method_idnum(i);
1817 m->set_orig_method_idnum(i);
1818 }
1819 }
1820 }
1821 }
1822
1823 //-----------------------------------------------------------------------------------
1824 // Non-product code unless JVM/TI needs it
1825
1826 #if !defined(PRODUCT) || INCLUDE_JVMTI
1827 class SignatureTypePrinter : public SignatureTypeNames {
1828 private:
1829 outputStream* _st;
1830 bool _use_separator;
1831
1832 void type_name(const char* name) {
1833 if (_use_separator) _st->print(", ");
1834 _st->print("%s", name);
1835 _use_separator = true;
1836 }
1837
1838 public:
1839 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1840 _st = st;
1841 _use_separator = false;
1842 }
1843
1844 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1845 void print_returntype() { _use_separator = false; do_type(return_type()); }
1846 };
1847
1848
1849 void Method::print_name(outputStream* st) const {
1850 Thread *thread = Thread::current();
1851 ResourceMark rm(thread);
1852 st->print("%s ", is_static() ? "static" : "virtual");
1853 if (WizardMode) {
1854 st->print("%s.", method_holder()->internal_name());
1855 name()->print_symbol_on(st);
1856 signature()->print_symbol_on(st);
1857 } else {
1858 SignatureTypePrinter sig(signature(), st);
1859 sig.print_returntype();
1860 st->print(" %s.", method_holder()->internal_name());
1861 name()->print_symbol_on(st);
1862 st->print("(");
1863 sig.print_parameters();
1864 st->print(")");
1865 }
1866 }
1867 #endif // !PRODUCT || INCLUDE_JVMTI
1868
1869
1870 void Method::print_codes_on(outputStream* st, int flags) const {
1871 print_codes_on(0, code_size(), st, flags);
1872 }
1873
1874 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1875 Thread *thread = Thread::current();
1876 ResourceMark rm(thread);
1877 methodHandle mh (thread, (Method*)this);
1878 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1879 }
1880
1881 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1882 _bci = 0;
1883 _line = 0;
1884 };
1885
1886 bool CompressedLineNumberReadStream::read_pair() {
1887 jubyte next = read_byte();
1888 // Check for terminator
1889 if (next == 0) return false;
1890 if (next == 0xFF) {
1891 // Escape character, regular compression used
1892 _bci += read_signed_int();
1893 _line += read_signed_int();
1894 } else {
1895 // Single byte compression used
1896 _bci += next >> 3;
1897 _line += next & 0x7;
1898 }
1899 return true;
1900 }
1901
1902 #if INCLUDE_JVMTI
1903
1904 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1905 BreakpointInfo* bp = method_holder()->breakpoints();
1906 for (; bp != nullptr; bp = bp->next()) {
1907 if (bp->match(this, bci)) {
1908 return bp->orig_bytecode();
1909 }
1910 }
1911 {
1912 ResourceMark rm;
1913 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1914 }
1915 return Bytecodes::_shouldnotreachhere;
1916 }
1917
1918 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1919 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1920 BreakpointInfo* bp = method_holder()->breakpoints();
1921 for (; bp != nullptr; bp = bp->next()) {
1922 if (bp->match(this, bci)) {
1923 bp->set_orig_bytecode(code);
1924 // and continue, in case there is more than one
1925 }
1926 }
1927 }
1928
1929 void Method::set_breakpoint(int bci) {
1930 InstanceKlass* ik = method_holder();
1931 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1932 bp->set_next(ik->breakpoints());
1933 ik->set_breakpoints(bp);
1934 // do this last:
1935 bp->set(this);
1936 }
1937
1938 static void clear_matches(Method* m, int bci) {
1939 InstanceKlass* ik = m->method_holder();
1940 BreakpointInfo* prev_bp = nullptr;
1941 BreakpointInfo* next_bp;
1942 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1943 next_bp = bp->next();
1944 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1945 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1946 // do this first:
1947 bp->clear(m);
1948 // unhook it
1949 if (prev_bp != nullptr)
1950 prev_bp->set_next(next_bp);
1951 else
1952 ik->set_breakpoints(next_bp);
1953 delete bp;
1954 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1955 // at same location. So we have multiple matching (method_index and bci)
1956 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1957 // breakpoint for clear_breakpoint request and keep all other method versions
1958 // BreakpointInfo for future clear_breakpoint request.
1959 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1960 // which is being called when class is unloaded. We delete all the Breakpoint
1961 // information for all versions of method. We may not correctly restore the original
1962 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1963 // so these methods won't be used anymore.
1964 if (bci >= 0) {
1965 break;
1966 }
1967 } else {
1968 // This one is a keeper.
1969 prev_bp = bp;
1970 }
1971 }
1972 }
1973
1974 void Method::clear_breakpoint(int bci) {
1975 assert(bci >= 0, "");
1976 clear_matches(this, bci);
1977 }
1978
1979 void Method::clear_all_breakpoints() {
1980 clear_matches(this, -1);
1981 }
1982
1983 #endif // INCLUDE_JVMTI
1984
1985 int Method::highest_osr_comp_level() const {
1986 const MethodCounters* mcs = method_counters();
1987 if (mcs != nullptr) {
1988 return mcs->highest_osr_comp_level();
1989 } else {
1990 return CompLevel_none;
1991 }
1992 }
1993
1994 void Method::set_highest_comp_level(int level) {
1995 MethodCounters* mcs = method_counters();
1996 if (mcs != nullptr) {
1997 mcs->set_highest_comp_level(level);
1998 }
1999 }
2000
2001 void Method::set_highest_osr_comp_level(int level) {
2002 MethodCounters* mcs = method_counters();
2003 if (mcs != nullptr) {
2004 mcs->set_highest_osr_comp_level(level);
2005 }
2006 }
2007
2008 #if INCLUDE_JVMTI
2009
2010 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2011 _bci = bci;
2012 _name_index = m->name_index();
2013 _signature_index = m->signature_index();
2014 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2015 if (_orig_bytecode == Bytecodes::_breakpoint)
2016 _orig_bytecode = m->orig_bytecode_at(_bci);
2017 _next = nullptr;
2018 }
2019
2020 void BreakpointInfo::set(Method* method) {
2021 #ifdef ASSERT
2022 {
2023 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2024 if (code == Bytecodes::_breakpoint)
2025 code = method->orig_bytecode_at(_bci);
2026 assert(orig_bytecode() == code, "original bytecode must be the same");
2027 }
2028 #endif
2029 Thread *thread = Thread::current();
2030 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2031 method->incr_number_of_breakpoints(thread);
2032 {
2033 // Deoptimize all dependents on this method
2034 HandleMark hm(thread);
2035 methodHandle mh(thread, method);
2036 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2037 }
2038 }
2039
2040 void BreakpointInfo::clear(Method* method) {
2041 *method->bcp_from(_bci) = orig_bytecode();
2042 assert(method->number_of_breakpoints() > 0, "must not go negative");
2043 method->decr_number_of_breakpoints(Thread::current());
2044 }
2045
2046 #endif // INCLUDE_JVMTI
2047
2048 // jmethodID handling
2049
2050 // This is a block allocating object, sort of like JNIHandleBlock, only a
2051 // lot simpler.
2052 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2053 // never get rid of it.
2054
2055 static const int min_block_size = 8;
2056
2057 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2058 friend class JNIMethodBlock;
2059 Method** _methods;
2060 int _number_of_methods;
2061 int _top;
2062 JNIMethodBlockNode* _next;
2063
2064 public:
2065
2066 JNIMethodBlockNode(int num_methods = min_block_size);
2067
2068 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2069
2070 void ensure_methods(int num_addl_methods) {
2071 if (_top < _number_of_methods) {
2072 num_addl_methods -= _number_of_methods - _top;
2073 if (num_addl_methods <= 0) {
2074 return;
2075 }
2076 }
2077 if (_next == nullptr) {
2078 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2079 } else {
2080 _next->ensure_methods(num_addl_methods);
2081 }
2082 }
2083 };
2084
2085 class JNIMethodBlock : public CHeapObj<mtClass> {
2086 JNIMethodBlockNode _head;
2087 JNIMethodBlockNode *_last_free;
2088 public:
2089 static Method* const _free_method;
2090
2091 JNIMethodBlock(int initial_capacity = min_block_size)
2092 : _head(initial_capacity), _last_free(&_head) {}
2093
2094 void ensure_methods(int num_addl_methods) {
2095 _last_free->ensure_methods(num_addl_methods);
2096 }
2097
2098 Method** add_method(Method* m) {
2099 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2100 if (b->_top < b->_number_of_methods) {
2101 // top points to the next free entry.
2102 int i = b->_top;
2103 b->_methods[i] = m;
2104 b->_top++;
2105 _last_free = b;
2106 return &(b->_methods[i]);
2107 } else if (b->_top == b->_number_of_methods) {
2108 // if the next free entry ran off the block see if there's a free entry
2109 for (int i = 0; i < b->_number_of_methods; i++) {
2110 if (b->_methods[i] == _free_method) {
2111 b->_methods[i] = m;
2112 _last_free = b;
2113 return &(b->_methods[i]);
2114 }
2115 }
2116 // Only check each block once for frees. They're very unlikely.
2117 // Increment top past the end of the block.
2118 b->_top++;
2119 }
2120 // need to allocate a next block.
2121 if (b->_next == nullptr) {
2122 b->_next = _last_free = new JNIMethodBlockNode();
2123 }
2124 }
2125 guarantee(false, "Should always allocate a free block");
2126 return nullptr;
2127 }
2128
2129 bool contains(Method** m) {
2130 if (m == nullptr) return false;
2131 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2132 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2133 // This is a bit of extra checking, for two reasons. One is
2134 // that contains() deals with pointers that are passed in by
2135 // JNI code, so making sure that the pointer is aligned
2136 // correctly is valuable. The other is that <= and > are
2137 // technically not defined on pointers, so the if guard can
2138 // pass spuriously; no modern compiler is likely to make that
2139 // a problem, though (and if one did, the guard could also
2140 // fail spuriously, which would be bad).
2141 ptrdiff_t idx = m - b->_methods;
2142 if (b->_methods + idx == m) {
2143 return true;
2144 }
2145 }
2146 }
2147 return false; // not found
2148 }
2149
2150 // During class unloading the methods are cleared, which is different
2151 // than freed.
2152 void clear_all_methods() {
2153 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2154 for (int i = 0; i< b->_number_of_methods; i++) {
2155 b->_methods[i] = nullptr;
2156 }
2157 }
2158 }
2159 #ifndef PRODUCT
2160 int count_methods() {
2161 // count all allocated methods
2162 int count = 0;
2163 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2164 for (int i = 0; i< b->_number_of_methods; i++) {
2165 if (b->_methods[i] != _free_method) count++;
2166 }
2167 }
2168 return count;
2169 }
2170 #endif // PRODUCT
2171 };
2172
2173 // Something that can't be mistaken for an address or a markWord
2174 Method* const JNIMethodBlock::_free_method = (Method*)55;
2175
2176 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2177 _number_of_methods = MAX2(num_methods, min_block_size);
2178 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2179 for (int i = 0; i < _number_of_methods; i++) {
2180 _methods[i] = JNIMethodBlock::_free_method;
2181 }
2182 }
2183
2184 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2185 // Have to add jmethod_ids() to class loader data thread-safely.
2186 // Also have to add the method to the list safely, which the lock
2187 // protects as well.
2188 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2189 if (cld->jmethod_ids() == nullptr) {
2190 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2191 } else {
2192 cld->jmethod_ids()->ensure_methods(capacity);
2193 }
2194 }
2195
2196 // Add a method id to the jmethod_ids
2197 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2198 // Have to add jmethod_ids() to class loader data thread-safely.
2199 // Also have to add the method to the list safely, which the lock
2200 // protects as well.
2201 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2202
2203 ResourceMark rm;
2204 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name());
2205 if (cld->jmethod_ids() == nullptr) {
2206 cld->set_jmethod_ids(new JNIMethodBlock());
2207 }
2208 // jmethodID is a pointer to Method*
2209 return (jmethodID)cld->jmethod_ids()->add_method(m);
2210 }
2211
2212 jmethodID Method::jmethod_id() {
2213 methodHandle mh(Thread::current(), this);
2214 return method_holder()->get_jmethod_id(mh);
2215 }
2216
2217 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2218 // Can't assert the method_holder is the same because the new method has the
2219 // scratch method holder.
2220 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2221 == new_method->method_holder()->class_loader() ||
2222 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2223 "changing to a different class loader");
2224 // Just change the method in place, jmethodID pointer doesn't change.
2225 *((Method**)jmid) = new_method;
2226 }
2227
2228 bool Method::is_method_id(jmethodID mid) {
2229 Method* m = resolve_jmethod_id(mid);
2230 assert(m != nullptr, "should be called with non-null method");
2231 InstanceKlass* ik = m->method_holder();
2232 ClassLoaderData* cld = ik->class_loader_data();
2233 if (cld->jmethod_ids() == nullptr) return false;
2234 return (cld->jmethod_ids()->contains((Method**)mid));
2235 }
2236
2237 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2238 if (mid == nullptr) return nullptr;
2239 Method* o = resolve_jmethod_id(mid);
2240 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2241 return nullptr;
2242 }
2243 // Method should otherwise be valid. Assert for testing.
2244 assert(is_valid_method(o), "should be valid jmethodid");
2245 // If the method's class holder object is unreferenced, but not yet marked as
2246 // unloaded, we need to return null here too because after a safepoint, its memory
2247 // will be reclaimed.
2248 return o->method_holder()->is_loader_alive() ? o : nullptr;
2249 };
2250
2251 void Method::set_on_stack(const bool value) {
2252 // Set both the method itself and its constant pool. The constant pool
2253 // on stack means some method referring to it is also on the stack.
2254 constants()->set_on_stack(value);
2255
2256 bool already_set = on_stack_flag();
2257 set_on_stack_flag(value);
2258 if (value && !already_set) {
2259 MetadataOnStackMark::record(this);
2260 }
2261 }
2262
2263 void Method::record_gc_epoch() {
2264 // If any method is on the stack in continuations, none of them can be reclaimed,
2265 // so save the marking cycle to check for the whole class in the cpCache.
2266 // The cpCache is writeable.
2267 constants()->cache()->record_gc_epoch();
2268 }
2269
2270 // Called when the class loader is unloaded to make all methods weak.
2271 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2272 loader_data->jmethod_ids()->clear_all_methods();
2273 }
2274
2275 void Method::clear_jmethod_id() {
2276 // Being at a safepoint prevents racing against other class redefinitions
2277 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2278 // The jmethodID is not stored in the Method instance, we need to look it up first
2279 jmethodID methodid = find_jmethod_id_or_null();
2280 // We need to make sure that jmethodID actually resolves to this method
2281 // - multiple redefined versions may share jmethodID slots and if a method
2282 // has already been rewired to a newer version we could be removing reference
2283 // to a still existing method instance
2284 if (methodid != nullptr && *((Method**)methodid) == this) {
2285 *((Method**)methodid) = nullptr;
2286 }
2287 }
2288
2289 bool Method::has_method_vptr(const void* ptr) {
2290 Method m;
2291 // This assumes that the vtbl pointer is the first word of a C++ object.
2292 return dereference_vptr(&m) == dereference_vptr(ptr);
2293 }
2294
2295 // Check that this pointer is valid by checking that the vtbl pointer matches
2296 bool Method::is_valid_method(const Method* m) {
2297 if (m == nullptr) {
2298 return false;
2299 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2300 // Quick sanity check on pointer.
2301 return false;
2302 } else if (!os::is_readable_range(m, m + 1)) {
2303 return false;
2304 } else if (m->is_shared()) {
2305 return CppVtables::is_valid_shared_method(m);
2306 } else if (Metaspace::contains_non_shared(m)) {
2307 return has_method_vptr((const void*)m);
2308 } else {
2309 return false;
2310 }
2311 }
2312
2313 bool Method::is_scalarized_arg(int idx) const {
2314 if (!has_scalarized_args()) {
2315 return false;
2316 }
2317 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID
2318 int depth = 0;
2319 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2320 for (int i = 0; i < sig->length(); i++) {
2321 BasicType bt = sig->at(i)._bt;
2322 if (bt == T_METADATA) {
2323 depth++;
2324 }
2325 if (idx == 0) {
2326 break; // Argument found
2327 }
2328 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2329 depth--;
2330 }
2331 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2332 idx--; // Advance to next argument
2333 }
2334 }
2335 return depth != 0;
2336 }
2337
2338 #ifndef PRODUCT
2339 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2340 out->print("%d", loader_data->jmethod_ids()->count_methods());
2341 }
2342 #endif // PRODUCT
2343
2344
2345 // Printing
2346
2347 #ifndef PRODUCT
2348
2349 void Method::print_on(outputStream* st) const {
2350 ResourceMark rm;
2351 assert(is_method(), "must be method");
2352 st->print_cr("%s", internal_name());
2353 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2354 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2355 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2356 constants()->print_value_on(st); st->cr();
2357 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr();
2358 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2359 st->print (" - name: "); name()->print_value_on(st); st->cr();
2360 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2361 st->print_cr(" - max stack: %d", max_stack());
2362 st->print_cr(" - max locals: %d", max_locals());
2363 st->print_cr(" - size of params: %d", size_of_parameters());
2364 st->print_cr(" - method size: %d", method_size());
2365 if (intrinsic_id() != vmIntrinsics::_none)
2366 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2367 if (highest_comp_level() != CompLevel_none)
2368 st->print_cr(" - highest level: %d", highest_comp_level());
2369 st->print_cr(" - vtable index: %d", _vtable_index);
2370 #ifdef ASSERT
2371 if (valid_itable_index())
2372 st->print_cr(" - itable index: %d", itable_index());
2373 #endif
2374 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2375 st->print( " - adapters: ");
2376 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2377 if (a == nullptr)
2378 st->print_cr(PTR_FORMAT, p2i(a));
2379 else
2380 a->print_adapter_on(st);
2381 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2382 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2383 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry()));
2384 st->print_cr(" - code size: %d", code_size());
2385 if (code_size() != 0) {
2386 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2387 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2388 }
2389 if (method_data() != nullptr) {
2390 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2391 }
2392 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2393 if (checked_exceptions_length() > 0) {
2394 CheckedExceptionElement* table = checked_exceptions_start();
2395 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2396 if (Verbose) {
2397 for (int i = 0; i < checked_exceptions_length(); i++) {
2398 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2399 }
2400 }
2401 }
2402 if (has_linenumber_table()) {
2403 u_char* table = compressed_linenumber_table();
2404 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2405 if (Verbose) {
2406 CompressedLineNumberReadStream stream(table);
2407 while (stream.read_pair()) {
2408 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2409 }
2410 }
2411 }
2412 st->print_cr(" - localvar length: %d", localvariable_table_length());
2413 if (localvariable_table_length() > 0) {
2414 LocalVariableTableElement* table = localvariable_table_start();
2415 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2416 if (Verbose) {
2417 for (int i = 0; i < localvariable_table_length(); i++) {
2418 int bci = table[i].start_bci;
2419 int len = table[i].length;
2420 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2421 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2422 int slot = table[i].slot;
2423 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2424 }
2425 }
2426 }
2427 if (code() != nullptr) {
2428 st->print (" - compiled code: ");
2429 code()->print_value_on(st);
2430 }
2431 if (is_native()) {
2432 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2433 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2434 }
2435 }
2436
2437 void Method::print_linkage_flags(outputStream* st) {
2438 access_flags().print_on(st);
2439 if (is_default_method()) {
2440 st->print("default ");
2441 }
2442 if (is_overpass()) {
2443 st->print("overpass ");
2444 }
2445 }
2446 #endif //PRODUCT
2447
2448 void Method::print_value_on(outputStream* st) const {
2449 assert(is_method(), "must be method");
2450 st->print("%s", internal_name());
2451 print_address_on(st);
2452 st->print(" ");
2453 if (WizardMode) access_flags().print_on(st);
2454 name()->print_value_on(st);
2455 st->print(" ");
2456 signature()->print_value_on(st);
2457 st->print(" in ");
2458 method_holder()->print_value_on(st);
2459 if (WizardMode) st->print("#%d", _vtable_index);
2460 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2461 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2462 }
2463
2464 // Verification
2465
2466 void Method::verify_on(outputStream* st) {
2467 guarantee(is_method(), "object must be method");
2468 guarantee(constants()->is_constantPool(), "should be constant pool");
2469 MethodData* md = method_data();
2470 guarantee(md == nullptr ||
2471 md->is_methodData(), "should be method data");
2472 }