1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "cds/cppVtables.hpp"
28 #include "cds/metaspaceShared.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderDataGraph.hpp"
31 #include "classfile/metadataOnStackMark.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmClasses.hpp"
35 #include "code/codeCache.hpp"
36 #include "code/debugInfoRec.hpp"
37 #include "compiler/compilationPolicy.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecodeStream.hpp"
40 #include "interpreter/bytecodeTracer.hpp"
41 #include "interpreter/bytecodes.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "logging/logTag.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/metadataFactory.hpp"
49 #include "memory/metaspaceClosure.hpp"
50 #include "memory/oopFactory.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "memory/universe.hpp"
53 #include "nmt/memTracker.hpp"
54 #include "oops/constMethod.hpp"
55 #include "oops/constantPool.hpp"
56 #include "oops/klass.inline.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/methodData.hpp"
59 #include "oops/objArrayKlass.hpp"
60 #include "oops/objArrayOop.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/symbol.hpp"
63 #include "oops/inlineKlass.inline.hpp"
64 #include "prims/jvmtiExport.hpp"
65 #include "prims/methodHandles.hpp"
66 #include "runtime/atomic.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/continuationEntry.hpp"
69 #include "runtime/frame.inline.hpp"
70 #include "runtime/handles.inline.hpp"
71 #include "runtime/init.hpp"
72 #include "runtime/java.hpp"
73 #include "runtime/orderAccess.hpp"
74 #include "runtime/perfData.hpp"
75 #include "runtime/relocator.hpp"
76 #include "runtime/safepointVerifiers.hpp"
77 #include "runtime/sharedRuntime.hpp"
78 #include "runtime/signature.hpp"
79 #include "runtime/threads.hpp"
80 #include "runtime/vm_version.hpp"
81 #include "utilities/align.hpp"
82 #include "utilities/quickSort.hpp"
83 #include "utilities/vmError.hpp"
84 #include "utilities/xmlstream.hpp"
85
86 // Implementation of Method
87
88 Method* Method::allocate(ClassLoaderData* loader_data,
89 int byte_code_size,
90 AccessFlags access_flags,
91 InlineTableSizes* sizes,
92 ConstMethod::MethodType method_type,
93 Symbol* name,
94 TRAPS) {
95 assert(!access_flags.is_native() || byte_code_size == 0,
96 "native methods should not contain byte codes");
97 ConstMethod* cm = ConstMethod::allocate(loader_data,
98 byte_code_size,
99 sizes,
100 method_type,
101 CHECK_NULL);
102 int size = Method::size(access_flags.is_native());
103 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
104 }
105
106 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
107 NoSafepointVerifier no_safepoint;
108 set_constMethod(xconst);
109 set_access_flags(access_flags);
110 set_intrinsic_id(vmIntrinsics::_none);
111 clear_method_data();
112 clear_method_counters();
113 set_vtable_index(Method::garbage_vtable_index);
114
115 // Fix and bury in Method*
116 set_interpreter_entry(nullptr); // sets i2i entry and from_int
117 set_adapter_entry(nullptr);
118 Method::clear_code(); // from_c/from_i get set to c2i/i2i
119
120 if (access_flags.is_native()) {
121 clear_native_function();
122 set_signature_handler(nullptr);
123 }
124 NOT_PRODUCT(set_compiled_invocation_count(0);)
125 // Name is very useful for debugging.
126 NOT_PRODUCT(_name = name;)
127 }
128
129 // Release Method*. The nmethod will be gone when we get here because
130 // we've walked the code cache.
131 void Method::deallocate_contents(ClassLoaderData* loader_data) {
132 MetadataFactory::free_metadata(loader_data, constMethod());
133 set_constMethod(nullptr);
134 MetadataFactory::free_metadata(loader_data, method_data());
135 clear_method_data();
136 MetadataFactory::free_metadata(loader_data, method_counters());
137 clear_method_counters();
138 // The nmethod will be gone when we get here.
139 if (code() != nullptr) _code = nullptr;
140 }
141
142 void Method::release_C_heap_structures() {
143 if (method_data()) {
144 method_data()->release_C_heap_structures();
145
146 // Destroy MethodData embedded lock
147 method_data()->~MethodData();
148 }
149 }
150
151 address Method::get_i2c_entry() {
152 assert(adapter() != nullptr, "must have");
153 return adapter()->get_i2c_entry();
154 }
155
156 address Method::get_c2i_entry() {
157 assert(adapter() != nullptr, "must have");
158 return adapter()->get_c2i_entry();
159 }
160
161 address Method::get_c2i_inline_entry() {
162 assert(adapter() != nullptr, "must have");
163 return adapter()->get_c2i_inline_entry();
164 }
165
166 address Method::get_c2i_unverified_entry() {
167 assert(adapter() != nullptr, "must have");
168 return adapter()->get_c2i_unverified_entry();
169 }
170
171 address Method::get_c2i_unverified_inline_entry() {
172 assert(adapter() != nullptr, "must have");
173 return adapter()->get_c2i_unverified_inline_entry();
174 }
175
176 address Method::get_c2i_no_clinit_check_entry() {
177 assert(VM_Version::supports_fast_class_init_checks(), "");
178 assert(adapter() != nullptr, "must have");
179 return adapter()->get_c2i_no_clinit_check_entry();
180 }
181
182 char* Method::name_and_sig_as_C_string() const {
183 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
184 }
185
186 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
187 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
188 }
189
190 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
191 const char* klass_name = klass->external_name();
192 int klass_name_len = (int)strlen(klass_name);
193 int method_name_len = method_name->utf8_length();
194 int len = klass_name_len + 1 + method_name_len + signature->utf8_length();
195 char* dest = NEW_RESOURCE_ARRAY(char, len + 1);
196 strcpy(dest, klass_name);
197 dest[klass_name_len] = '.';
198 strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
199 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
200 dest[len] = 0;
201 return dest;
202 }
203
204 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
205 Symbol* klass_name = klass->name();
206 klass_name->as_klass_external_name(buf, size);
207 int len = (int)strlen(buf);
208
209 if (len < size - 1) {
210 buf[len++] = '.';
211
212 method_name->as_C_string(&(buf[len]), size - len);
213 len = (int)strlen(buf);
214
215 signature->as_C_string(&(buf[len]), size - len);
216 }
217
218 return buf;
219 }
220
221 const char* Method::external_name() const {
222 return external_name(constants()->pool_holder(), name(), signature());
223 }
224
225 void Method::print_external_name(outputStream *os) const {
226 print_external_name(os, constants()->pool_holder(), name(), signature());
227 }
228
229 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) {
230 stringStream ss;
231 print_external_name(&ss, klass, method_name, signature);
232 return ss.as_string();
233 }
234
235 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) {
236 signature->print_as_signature_external_return_type(os);
237 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string());
238 signature->print_as_signature_external_parameters(os);
239 os->print(")");
240 }
241
242 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
243 if (log_is_enabled(Debug, exceptions)) {
244 ResourceMark rm(THREAD);
245 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"",
246 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string());
247 }
248 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
249 // access exception table
250 ExceptionTable table(mh());
251 int length = table.length();
252 // iterate through all entries sequentially
253 constantPoolHandle pool(THREAD, mh->constants());
254 for (int i = 0; i < length; i ++) {
255 //reacquire the table in case a GC happened
256 ExceptionTable table(mh());
257 int beg_bci = table.start_pc(i);
258 int end_bci = table.end_pc(i);
259 assert(beg_bci <= end_bci, "inconsistent exception table");
260 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d",
261 beg_bci, end_bci);
262
263 if (beg_bci <= throw_bci && throw_bci < end_bci) {
264 // exception handler bci range covers throw_bci => investigate further
265 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci);
266
267 int handler_bci = table.handler_pc(i);
268 int klass_index = table.catch_type_index(i);
269 if (klass_index == 0) {
270 if (log_is_enabled(Info, exceptions)) {
271 ResourceMark rm(THREAD);
272 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
273 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
274 }
275 return handler_bci;
276 } else if (ex_klass == nullptr) {
277 // Is this even possible?
278 if (log_is_enabled(Info, exceptions)) {
279 ResourceMark rm(THREAD);
280 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d",
281 mh()->name()->as_C_string(), handler_bci);
282 }
283 return handler_bci;
284 } else {
285 if (log_is_enabled(Debug, exceptions)) {
286 ResourceMark rm(THREAD);
287 log_debug(exceptions)(" - resolving catch type \"%s\"",
288 pool->klass_name_at(klass_index)->as_C_string());
289 }
290 // we know the exception class => get the constraint class
291 // this may require loading of the constraint class; if verification
292 // fails or some other exception occurs, return handler_bci
293 Klass* k = pool->klass_at(klass_index, THREAD);
294 if (HAS_PENDING_EXCEPTION) {
295 if (log_is_enabled(Debug, exceptions)) {
296 ResourceMark rm(THREAD);
297 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type",
298 PENDING_EXCEPTION->klass()->external_name());
299 }
300 return handler_bci;
301 }
302 assert(k != nullptr, "klass not loaded");
303 if (ex_klass->is_subtype_of(k)) {
304 if (log_is_enabled(Info, exceptions)) {
305 ResourceMark rm(THREAD);
306 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d",
307 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
308 }
309 return handler_bci;
310 }
311 }
312 }
313 }
314
315 if (log_is_enabled(Debug, exceptions)) {
316 ResourceMark rm(THREAD);
317 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"",
318 ex_klass->external_name(), mh->name()->as_C_string());
319 }
320
321 return -1;
322 }
323
324 void Method::mask_for(int bci, InterpreterOopMap* mask) {
325 methodHandle h_this(Thread::current(), this);
326 mask_for(h_this, bci, mask);
327 }
328
329 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) {
330 assert(this_mh() == this, "Sanity");
331 method_holder()->mask_for(this_mh, bci, mask);
332 }
333
334 int Method::bci_from(address bcp) const {
335 if (is_native() && bcp == nullptr) {
336 return 0;
337 }
338 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
339 // may call this after interrupting a nested ResourceMark.
340 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(),
341 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
342
343 return int(bcp - code_base());
344 }
345
346
347 int Method::validate_bci(int bci) const {
348 return (bci == 0 || bci < code_size()) ? bci : -1;
349 }
350
351 // Return bci if it appears to be a valid bcp
352 // Return -1 otherwise.
353 // Used by profiling code, when invalid data is a possibility.
354 // The caller is responsible for validating the Method* itself.
355 int Method::validate_bci_from_bcp(address bcp) const {
356 // keep bci as -1 if not a valid bci
357 int bci = -1;
358 if (bcp == 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 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
905 int length = method->checked_exceptions_length();
906 if (length == 0) { // common case
907 return objArrayHandle(THREAD, Universe::the_empty_class_array());
908 } else {
909 methodHandle h_this(THREAD, method);
910 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
911 objArrayHandle mirrors (THREAD, m_oop);
912 for (int i = 0; i < length; i++) {
913 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
914 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
915 if (log_is_enabled(Warning, exceptions) &&
916 !k->is_subclass_of(vmClasses::Throwable_klass())) {
917 ResourceMark rm(THREAD);
918 log_warning(exceptions)(
919 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
920 k->external_name(), method->external_name());
921 }
922 mirrors->obj_at_put(i, k->java_mirror());
923 }
924 return mirrors;
925 }
926 };
927
928
929 int Method::line_number_from_bci(int bci) const {
930 int best_bci = 0;
931 int best_line = -1;
932 if (bci == SynchronizationEntryBCI) bci = 0;
933 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
934 // The line numbers are a short array of 2-tuples [start_pc, line_number].
935 // Not necessarily sorted and not necessarily one-to-one.
936 CompressedLineNumberReadStream stream(compressed_linenumber_table());
937 while (stream.read_pair()) {
938 if (stream.bci() == bci) {
939 // perfect match
940 return stream.line();
941 } else {
942 // update best_bci/line
943 if (stream.bci() < bci && stream.bci() >= best_bci) {
944 best_bci = stream.bci();
945 best_line = stream.line();
946 }
947 }
948 }
949 }
950 return best_line;
951 }
952
953
954 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
955 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
956 Thread *thread = Thread::current();
957 Symbol* klass_name = constants()->klass_name_at(klass_index);
958 Handle loader(thread, method_holder()->class_loader());
959 Handle prot (thread, method_holder()->protection_domain());
960 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != nullptr;
961 } else {
962 return true;
963 }
964 }
965
966
967 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
968 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc);
969 if (must_be_resolved) {
970 // Make sure klass is resolved in constantpool.
971 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
972 return false;
973 }
974 }
975 return is_klass_loaded_by_klass_index(klass_index);
976 }
977
978
979 void Method::set_native_function(address function, bool post_event_flag) {
980 assert(function != nullptr, "use clear_native_function to unregister natives");
981 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
982 address* native_function = native_function_addr();
983
984 // We can see racers trying to place the same native function into place. Once
985 // is plenty.
986 address current = *native_function;
987 if (current == function) return;
988 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
989 function != nullptr) {
990 // native_method_throw_unsatisfied_link_error_entry() should only
991 // be passed when post_event_flag is false.
992 assert(function !=
993 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
994 "post_event_flag mismatch");
995
996 // post the bind event, and possible change the bind function
997 JvmtiExport::post_native_method_bind(this, &function);
998 }
999 *native_function = function;
1000 // This function can be called more than once. We must make sure that we always
1001 // use the latest registered method -> check if a stub already has been generated.
1002 // If so, we have to make it not_entrant.
1003 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
1004 if (nm != nullptr) {
1005 nm->make_not_entrant();
1006 }
1007 }
1008
1009
1010 bool Method::has_native_function() const {
1011 if (is_special_native_intrinsic())
1012 return false; // special-cased in SharedRuntime::generate_native_wrapper
1013 address func = native_function();
1014 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1015 }
1016
1017
1018 void Method::clear_native_function() {
1019 // Note: is_method_handle_intrinsic() is allowed here.
1020 set_native_function(
1021 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1022 !native_bind_event_is_interesting);
1023 this->unlink_code();
1024 }
1025
1026
1027 void Method::set_signature_handler(address handler) {
1028 address* signature_handler = signature_handler_addr();
1029 *signature_handler = handler;
1030 }
1031
1032
1033 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1034 assert(reason != nullptr, "must provide a reason");
1035 if (PrintCompilation && report) {
1036 ttyLocker ttyl;
1037 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1038 if (comp_level == CompLevel_all) {
1039 tty->print("all levels ");
1040 } else {
1041 tty->print("level %d ", comp_level);
1042 }
1043 this->print_short_name(tty);
1044 int size = this->code_size();
1045 if (size > 0) {
1046 tty->print(" (%d bytes)", size);
1047 }
1048 if (reason != nullptr) {
1049 tty->print(" %s", reason);
1050 }
1051 tty->cr();
1052 }
1053 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) {
1054 ttyLocker ttyl;
1055 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
1056 os::current_thread_id(), is_osr, comp_level);
1057 if (reason != nullptr) {
1058 xtty->print(" reason=\'%s\'", reason);
1059 }
1060 xtty->method(this);
1061 xtty->stamp();
1062 xtty->end_elem();
1063 }
1064 }
1065
1066 bool Method::is_always_compilable() const {
1067 // Generated adapters must be compiled
1068 if (is_special_native_intrinsic() && is_synthetic()) {
1069 assert(!is_not_c1_compilable(), "sanity check");
1070 assert(!is_not_c2_compilable(), "sanity check");
1071 return true;
1072 }
1073
1074 return false;
1075 }
1076
1077 bool Method::is_not_compilable(int comp_level) const {
1078 if (number_of_breakpoints() > 0)
1079 return true;
1080 if (is_always_compilable())
1081 return false;
1082 if (comp_level == CompLevel_any)
1083 return is_not_c1_compilable() && is_not_c2_compilable();
1084 if (is_c1_compile(comp_level))
1085 return is_not_c1_compilable();
1086 if (is_c2_compile(comp_level))
1087 return is_not_c2_compilable();
1088 return false;
1089 }
1090
1091 // call this when compiler finds that this method is not compilable
1092 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1093 if (is_always_compilable()) {
1094 // Don't mark a method which should be always compilable
1095 return;
1096 }
1097 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1098 if (comp_level == CompLevel_all) {
1099 set_is_not_c1_compilable();
1100 set_is_not_c2_compilable();
1101 } else {
1102 if (is_c1_compile(comp_level))
1103 set_is_not_c1_compilable();
1104 if (is_c2_compile(comp_level))
1105 set_is_not_c2_compilable();
1106 }
1107 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1108 }
1109
1110 bool Method::is_not_osr_compilable(int comp_level) const {
1111 if (is_not_compilable(comp_level))
1112 return true;
1113 if (comp_level == CompLevel_any)
1114 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1115 if (is_c1_compile(comp_level))
1116 return is_not_c1_osr_compilable();
1117 if (is_c2_compile(comp_level))
1118 return is_not_c2_osr_compilable();
1119 return false;
1120 }
1121
1122 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1123 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1124 if (comp_level == CompLevel_all) {
1125 set_is_not_c1_osr_compilable();
1126 set_is_not_c2_osr_compilable();
1127 } else {
1128 if (is_c1_compile(comp_level))
1129 set_is_not_c1_osr_compilable();
1130 if (is_c2_compile(comp_level))
1131 set_is_not_c2_osr_compilable();
1132 }
1133 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1134 }
1135
1136 // Revert to using the interpreter and clear out the nmethod
1137 void Method::clear_code() {
1138 // this may be null if c2i adapters have not been made yet
1139 // Only should happen at allocate time.
1140 if (adapter() == nullptr) {
1141 _from_compiled_entry = nullptr;
1142 _from_compiled_inline_entry = nullptr;
1143 _from_compiled_inline_ro_entry = nullptr;
1144 } else {
1145 _from_compiled_entry = adapter()->get_c2i_entry();
1146 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1147 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1148 }
1149 OrderAccess::storestore();
1150 _from_interpreted_entry = _i2i_entry;
1151 OrderAccess::storestore();
1152 _code = nullptr;
1153 }
1154
1155 void Method::unlink_code(nmethod *compare) {
1156 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1157 // We need to check if either the _code or _from_compiled_code_entry_point
1158 // refer to this nmethod because there is a race in setting these two fields
1159 // in Method* as seen in bugid 4947125.
1160 if (code() == compare ||
1161 from_compiled_entry() == compare->verified_entry_point()) {
1162 clear_code();
1163 }
1164 }
1165
1166 void Method::unlink_code() {
1167 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1168 clear_code();
1169 }
1170
1171 #if INCLUDE_CDS
1172 // Called by class data sharing to remove any entry points (which are not shared)
1173 void Method::unlink_method() {
1174 assert(CDSConfig::is_dumping_archive(), "sanity");
1175 _code = nullptr;
1176 _adapter = nullptr;
1177 _i2i_entry = nullptr;
1178 _from_compiled_entry = nullptr;
1179 _from_compiled_inline_entry = nullptr;
1180 _from_compiled_inline_ro_entry = nullptr;
1181 _from_interpreted_entry = nullptr;
1182
1183 if (is_native()) {
1184 *native_function_addr() = nullptr;
1185 set_signature_handler(nullptr);
1186 }
1187 NOT_PRODUCT(set_compiled_invocation_count(0);)
1188
1189 clear_method_data();
1190 clear_method_counters();
1191 remove_unshareable_flags();
1192 }
1193
1194 void Method::remove_unshareable_flags() {
1195 // clear all the flags that shouldn't be in the archived version
1196 assert(!is_old(), "must be");
1197 assert(!is_obsolete(), "must be");
1198 assert(!is_deleted(), "must be");
1199
1200 set_is_prefixed_native(false);
1201 set_queued_for_compilation(false);
1202 set_is_not_c2_compilable(false);
1203 set_is_not_c1_compilable(false);
1204 set_is_not_c2_osr_compilable(false);
1205 set_on_stack_flag(false);
1206 set_has_scalarized_args(false);
1207 set_has_scalarized_return(false);
1208 }
1209 #endif
1210
1211 // Called when the method_holder is getting linked. Setup entrypoints so the method
1212 // is ready to be called from interpreter, compiler, and vtables.
1213 void Method::link_method(const methodHandle& h_method, TRAPS) {
1214 if (log_is_enabled(Info, perf, class, link)) {
1215 ClassLoader::perf_ik_link_methods_count()->inc();
1216 }
1217
1218 // If the code cache is full, we may reenter this function for the
1219 // leftover methods that weren't linked.
1220 if (adapter() != nullptr) {
1221 return;
1222 }
1223 assert( _code == nullptr, "nothing compiled yet" );
1224
1225 // Setup interpreter entrypoint
1226 assert(this == h_method(), "wrong h_method()" );
1227
1228 assert(adapter() == nullptr, "init'd to null");
1229 address entry = Interpreter::entry_for_method(h_method);
1230 assert(entry != nullptr, "interpreter entry must be non-null");
1231 // Sets both _i2i_entry and _from_interpreted_entry
1232 set_interpreter_entry(entry);
1233
1234 // Don't overwrite already registered native entries.
1235 if (is_native() && !has_native_function()) {
1236 set_native_function(
1237 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1238 !native_bind_event_is_interesting);
1239 }
1240 if (InlineTypeReturnedAsFields && returns_inline_type(THREAD) && !has_scalarized_return()) {
1241 set_has_scalarized_return();
1242 }
1243
1244 // Setup compiler entrypoint. This is made eagerly, so we do not need
1245 // special handling of vtables. An alternative is to make adapters more
1246 // lazily by calling make_adapter() from from_compiled_entry() for the
1247 // normal calls. For vtable calls life gets more complicated. When a
1248 // call-site goes mega-morphic we need adapters in all methods which can be
1249 // called from the vtable. We need adapters on such methods that get loaded
1250 // later. Ditto for mega-morphic itable calls. If this proves to be a
1251 // problem we'll make these lazily later.
1252 (void) make_adapters(h_method, CHECK);
1253
1254 // ONLY USE the h_method now as make_adapter may have blocked
1255
1256 if (h_method->is_continuation_native_intrinsic()) {
1257 _from_interpreted_entry = nullptr;
1258 _from_compiled_entry = nullptr;
1259 _i2i_entry = nullptr;
1260 if (Continuations::enabled()) {
1261 assert(!Threads::is_vm_complete(), "should only be called during vm init");
1262 AdapterHandlerLibrary::create_native_wrapper(h_method);
1263 if (!h_method->has_compiled_code()) {
1264 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small");
1265 }
1266 assert(_from_interpreted_entry == get_i2c_entry(), "invariant");
1267 }
1268 }
1269 }
1270
1271 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1272 PerfTraceTime timer(ClassLoader::perf_method_adapters_time());
1273
1274 // Adapters for compiled code are made eagerly here. They are fairly
1275 // small (generally < 100 bytes) and quick to make (and cached and shared)
1276 // so making them eagerly shouldn't be too expensive.
1277 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1278 if (adapter == nullptr ) {
1279 if (!is_init_completed()) {
1280 // Don't throw exceptions during VM initialization because java.lang.* classes
1281 // might not have been initialized, causing problems when constructing the
1282 // Java exception object.
1283 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1284 } else {
1285 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
1286 }
1287 }
1288
1289 mh->set_adapter_entry(adapter);
1290 mh->_from_compiled_entry = adapter->get_c2i_entry();
1291 mh->_from_compiled_inline_entry = adapter->get_c2i_inline_entry();
1292 mh->_from_compiled_inline_ro_entry = adapter->get_c2i_inline_ro_entry();
1293 return adapter->get_c2i_entry();
1294 }
1295
1296 // The verified_code_entry() must be called when a invoke is resolved
1297 // on this method.
1298
1299 // It returns the compiled code entry point, after asserting not null.
1300 // This function is called after potential safepoints so that nmethod
1301 // or adapter that it points to is still live and valid.
1302 // This function must not hit a safepoint!
1303 address Method::verified_code_entry() {
1304 debug_only(NoSafepointVerifier nsv;)
1305 assert(_from_compiled_entry != nullptr, "must be set");
1306 return _from_compiled_entry;
1307 }
1308
1309 address Method::verified_inline_code_entry() {
1310 debug_only(NoSafepointVerifier nsv;)
1311 assert(_from_compiled_inline_entry != nullptr, "must be set");
1312 return _from_compiled_inline_entry;
1313 }
1314
1315 address Method::verified_inline_ro_code_entry() {
1316 debug_only(NoSafepointVerifier nsv;)
1317 assert(_from_compiled_inline_ro_entry != nullptr, "must be set");
1318 return _from_compiled_inline_ro_entry;
1319 }
1320
1321 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1322 // (could be racing a deopt).
1323 // Not inline to avoid circular ref.
1324 bool Method::check_code() const {
1325 // cached in a register or local. There's a race on the value of the field.
1326 nmethod *code = Atomic::load_acquire(&_code);
1327 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method());
1328 }
1329
1330 // Install compiled code. Instantly it can execute.
1331 void Method::set_code(const methodHandle& mh, nmethod *code) {
1332 assert_lock_strong(NMethodState_lock);
1333 assert( code, "use clear_code to remove code" );
1334 assert( mh->check_code(), "" );
1335
1336 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!");
1337
1338 // These writes must happen in this order, because the interpreter will
1339 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1340 // which jumps to _from_compiled_entry.
1341 mh->_code = code; // Assign before allowing compiled code to exec
1342
1343 int comp_level = code->comp_level();
1344 // In theory there could be a race here. In practice it is unlikely
1345 // and not worth worrying about.
1346 if (comp_level > mh->highest_comp_level()) {
1347 mh->set_highest_comp_level(comp_level);
1348 }
1349
1350 OrderAccess::storestore();
1351 mh->_from_compiled_entry = code->verified_entry_point();
1352 mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1353 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1354 OrderAccess::storestore();
1355
1356 if (mh->is_continuation_native_intrinsic()) {
1357 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method
1358
1359 if (mh->is_continuation_enter_intrinsic()) {
1360 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1361 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1362 } else if (mh->is_continuation_yield_intrinsic()) {
1363 mh->_i2i_entry = mh->get_i2c_entry();
1364 } else {
1365 guarantee(false, "Unknown Continuation native intrinsic");
1366 }
1367 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1368 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1369 } else if (!mh->is_method_handle_intrinsic()) {
1370 // Instantly compiled code can execute.
1371 mh->_from_interpreted_entry = mh->get_i2c_entry();
1372 }
1373 }
1374
1375
1376 bool Method::is_overridden_in(Klass* k) const {
1377 InstanceKlass* ik = InstanceKlass::cast(k);
1378
1379 if (ik->is_interface()) return false;
1380
1381 // If method is an interface, we skip it - except if it
1382 // is a miranda method
1383 if (method_holder()->is_interface()) {
1384 // Check that method is not a miranda method
1385 if (ik->lookup_method(name(), signature()) == nullptr) {
1386 // No implementation exist - so miranda method
1387 return false;
1388 }
1389 return true;
1390 }
1391
1392 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1393 if (!has_vtable_index()) {
1394 return false;
1395 } else {
1396 Method* vt_m = ik->method_at_vtable(vtable_index());
1397 return vt_m != this;
1398 }
1399 }
1400
1401
1402 // give advice about whether this Method* should be cached or not
1403 bool Method::should_not_be_cached() const {
1404 if (is_old()) {
1405 // This method has been redefined. It is either EMCP or obsolete
1406 // and we don't want to cache it because that would pin the method
1407 // down and prevent it from being collectible if and when it
1408 // finishes executing.
1409 return true;
1410 }
1411
1412 // caching this method should be just fine
1413 return false;
1414 }
1415
1416
1417 /**
1418 * Returns true if this is one of the specially treated methods for
1419 * security related stack walks (like Reflection.getCallerClass).
1420 */
1421 bool Method::is_ignored_by_security_stack_walk() const {
1422 if (intrinsic_id() == vmIntrinsics::_invoke) {
1423 // This is Method.invoke() -- ignore it
1424 return true;
1425 }
1426 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1427 // This is an auxiliary frame -- ignore it
1428 return true;
1429 }
1430 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1431 // This is an internal adapter frame for method handles -- ignore it
1432 return true;
1433 }
1434 return false;
1435 }
1436
1437
1438 // Constant pool structure for invoke methods:
1439 enum {
1440 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1441 _imcp_invoke_signature, // utf8: (variable Symbol*)
1442 _imcp_limit
1443 };
1444
1445 // Test if this method is an MH adapter frame generated by Java code.
1446 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1447 bool Method::is_compiled_lambda_form() const {
1448 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1449 }
1450
1451 // Test if this method is an internal MH primitive method.
1452 bool Method::is_method_handle_intrinsic() const {
1453 vmIntrinsics::ID iid = intrinsic_id();
1454 return (MethodHandles::is_signature_polymorphic(iid) &&
1455 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1456 }
1457
1458 bool Method::has_member_arg() const {
1459 vmIntrinsics::ID iid = intrinsic_id();
1460 return (MethodHandles::is_signature_polymorphic(iid) &&
1461 MethodHandles::has_member_arg(iid));
1462 }
1463
1464 // Make an instance of a signature-polymorphic internal MH primitive.
1465 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1466 Symbol* signature,
1467 TRAPS) {
1468 ResourceMark rm(THREAD);
1469 methodHandle empty;
1470
1471 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1472 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1473 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1474
1475 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1476
1477 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1478 name->increment_refcount();
1479 signature->increment_refcount();
1480
1481 int cp_length = _imcp_limit;
1482 ClassLoaderData* loader_data = holder->class_loader_data();
1483 constantPoolHandle cp;
1484 {
1485 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1486 cp = constantPoolHandle(THREAD, cp_oop);
1487 }
1488 cp->copy_fields(holder->constants());
1489 cp->set_pool_holder(holder);
1490 cp->symbol_at_put(_imcp_invoke_name, name);
1491 cp->symbol_at_put(_imcp_invoke_signature, signature);
1492 cp->set_has_preresolution();
1493
1494 // decide on access bits: public or not?
1495 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1496 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1497 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1498 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1499
1500 methodHandle m;
1501 {
1502 InlineTableSizes sizes;
1503 Method* m_oop = Method::allocate(loader_data, 0,
1504 accessFlags_from(flags_bits), &sizes,
1505 ConstMethod::NORMAL,
1506 name,
1507 CHECK_(empty));
1508 m = methodHandle(THREAD, m_oop);
1509 }
1510 m->set_constants(cp());
1511 m->set_name_index(_imcp_invoke_name);
1512 m->set_signature_index(_imcp_invoke_signature);
1513 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1514 assert(m->signature() == signature, "");
1515 m->constMethod()->compute_from_signature(signature, must_be_static);
1516 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1517 assert(m->is_method_handle_intrinsic(), "");
1518 #ifdef ASSERT
1519 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1520 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1521 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1522 #endif //ASSERT
1523
1524 // Finally, set up its entry points.
1525 assert(m->can_be_statically_bound(), "");
1526 m->set_vtable_index(Method::nonvirtual_vtable_index);
1527 m->link_method(m, CHECK_(empty));
1528
1529 if (iid == vmIntrinsics::_linkToNative) {
1530 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1531 }
1532 if (log_is_enabled(Debug, methodhandles)) {
1533 LogTarget(Debug, methodhandles) lt;
1534 LogStream ls(lt);
1535 m->print_on(&ls);
1536 }
1537
1538 return m;
1539 }
1540
1541 Klass* Method::check_non_bcp_klass(Klass* klass) {
1542 if (klass != nullptr && klass->class_loader() != nullptr) {
1543 if (klass->is_objArray_klass())
1544 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1545 return klass;
1546 }
1547 return nullptr;
1548 }
1549
1550
1551 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1552 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1553 // Code below does not work for native methods - they should never get rewritten anyway
1554 assert(!m->is_native(), "cannot rewrite native methods");
1555 // Allocate new Method*
1556 AccessFlags flags = m->access_flags();
1557
1558 ConstMethod* cm = m->constMethod();
1559 int checked_exceptions_len = cm->checked_exceptions_length();
1560 int localvariable_len = cm->localvariable_table_length();
1561 int exception_table_len = cm->exception_table_length();
1562 int method_parameters_len = cm->method_parameters_length();
1563 int method_annotations_len = cm->method_annotations_length();
1564 int parameter_annotations_len = cm->parameter_annotations_length();
1565 int type_annotations_len = cm->type_annotations_length();
1566 int default_annotations_len = cm->default_annotations_length();
1567
1568 InlineTableSizes sizes(
1569 localvariable_len,
1570 new_compressed_linenumber_size,
1571 exception_table_len,
1572 checked_exceptions_len,
1573 method_parameters_len,
1574 cm->generic_signature_index(),
1575 method_annotations_len,
1576 parameter_annotations_len,
1577 type_annotations_len,
1578 default_annotations_len,
1579 0);
1580
1581 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1582 Method* newm_oop = Method::allocate(loader_data,
1583 new_code_length,
1584 flags,
1585 &sizes,
1586 m->method_type(),
1587 m->name(),
1588 CHECK_(methodHandle()));
1589 methodHandle newm (THREAD, newm_oop);
1590
1591 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1592 ConstMethod* newcm = newm->constMethod();
1593 int new_const_method_size = newm->constMethod()->size();
1594
1595 // This works because the source and target are both Methods. Some compilers
1596 // (e.g., clang) complain that the target vtable pointer will be stomped,
1597 // so cast away newm()'s and m()'s Methodness.
1598 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1599
1600 // Create shallow copy of ConstMethod.
1601 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1602
1603 // Reset correct method/const method, method size, and parameter info
1604 newm->set_constMethod(newcm);
1605 newm->constMethod()->set_code_size(new_code_length);
1606 newm->constMethod()->set_constMethod_size(new_const_method_size);
1607 assert(newm->code_size() == new_code_length, "check");
1608 assert(newm->method_parameters_length() == method_parameters_len, "check");
1609 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1610 assert(newm->exception_table_length() == exception_table_len, "check");
1611 assert(newm->localvariable_table_length() == localvariable_len, "check");
1612 // Copy new byte codes
1613 memcpy(newm->code_base(), new_code, new_code_length);
1614 // Copy line number table
1615 if (new_compressed_linenumber_size > 0) {
1616 memcpy(newm->compressed_linenumber_table(),
1617 new_compressed_linenumber_table,
1618 new_compressed_linenumber_size);
1619 }
1620 // Copy method_parameters
1621 if (method_parameters_len > 0) {
1622 memcpy(newm->method_parameters_start(),
1623 m->method_parameters_start(),
1624 method_parameters_len * sizeof(MethodParametersElement));
1625 }
1626 // Copy checked_exceptions
1627 if (checked_exceptions_len > 0) {
1628 memcpy(newm->checked_exceptions_start(),
1629 m->checked_exceptions_start(),
1630 checked_exceptions_len * sizeof(CheckedExceptionElement));
1631 }
1632 // Copy exception table
1633 if (exception_table_len > 0) {
1634 memcpy(newm->exception_table_start(),
1635 m->exception_table_start(),
1636 exception_table_len * sizeof(ExceptionTableElement));
1637 }
1638 // Copy local variable number table
1639 if (localvariable_len > 0) {
1640 memcpy(newm->localvariable_table_start(),
1641 m->localvariable_table_start(),
1642 localvariable_len * sizeof(LocalVariableTableElement));
1643 }
1644 // Copy stackmap table
1645 if (m->has_stackmap_table()) {
1646 int code_attribute_length = m->stackmap_data()->length();
1647 Array<u1>* stackmap_data =
1648 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1649 memcpy((void*)stackmap_data->adr_at(0),
1650 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1651 newm->set_stackmap_data(stackmap_data);
1652 }
1653
1654 // copy annotations over to new method
1655 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1656 return newm;
1657 }
1658
1659 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1660 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics
1661 // because we are not loading from core libraries
1662 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1663 // which does not use the class default class loader so we check for its loader here
1664 const InstanceKlass* ik = InstanceKlass::cast(holder);
1665 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1666 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1667 }
1668
1669 // see if the klass name is well-known:
1670 Symbol* klass_name = ik->name();
1671 vmSymbolID id = vmSymbols::find_sid(klass_name);
1672 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1673 return id;
1674 } else {
1675 return vmSymbolID::NO_SID;
1676 }
1677 }
1678
1679 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1680 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1681 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1682 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1683 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1684
1685 // the klass name is well-known:
1686 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1687 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1688
1689 // ditto for method and signature:
1690 vmSymbolID name_id = vmSymbols::find_sid(name());
1691 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1692 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1693 && name_id == vmSymbolID::NO_SID) {
1694 return;
1695 }
1696 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1697 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1698 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1699 && sig_id == vmSymbolID::NO_SID) {
1700 return;
1701 }
1702 jshort flags = access_flags().as_short();
1703
1704 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1705 if (id != vmIntrinsics::_none) {
1706 set_intrinsic_id(id);
1707 if (id == vmIntrinsics::_Class_cast) {
1708 // Even if the intrinsic is rejected, we want to inline this simple method.
1709 set_force_inline();
1710 }
1711 return;
1712 }
1713
1714 // A few slightly irregular cases:
1715 switch (klass_id) {
1716 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1717 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1718 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1719 if (!is_native()) break;
1720 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1721 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1722 id = vmIntrinsics::_none;
1723 break;
1724
1725 default:
1726 break;
1727 }
1728
1729 if (id != vmIntrinsics::_none) {
1730 // Set up its iid. It is an alias method.
1731 set_intrinsic_id(id);
1732 return;
1733 }
1734 }
1735
1736 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1737 if (!THREAD->can_call_java()) {
1738 // There is nothing useful this routine can do from within the Compile thread.
1739 // Hopefully, the signature contains only well-known classes.
1740 // We could scan for this and return true/false, but the caller won't care.
1741 return false;
1742 }
1743 bool sig_is_loaded = true;
1744 ResourceMark rm(THREAD);
1745 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1746 if (ss.is_reference()) {
1747 // load everything, including arrays "[Lfoo;"
1748 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1749 // We are loading classes eagerly. If a ClassNotFoundException or
1750 // a LinkageError was generated, be sure to ignore it.
1751 if (HAS_PENDING_EXCEPTION) {
1752 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1753 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1754 CLEAR_PENDING_EXCEPTION;
1755 } else {
1756 return false;
1757 }
1758 }
1759 if( klass == nullptr) { sig_is_loaded = false; }
1760 }
1761 }
1762 return sig_is_loaded;
1763 }
1764
1765 // Exposed so field engineers can debug VM
1766 void Method::print_short_name(outputStream* st) const {
1767 ResourceMark rm;
1768 #ifdef PRODUCT
1769 st->print(" %s::", method_holder()->external_name());
1770 #else
1771 st->print(" %s::", method_holder()->internal_name());
1772 #endif
1773 name()->print_symbol_on(st);
1774 if (WizardMode) signature()->print_symbol_on(st);
1775 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1776 MethodHandles::print_as_basic_type_signature_on(st, signature());
1777 }
1778
1779 // Comparer for sorting an object array containing
1780 // Method*s.
1781 static int method_comparator(Method* a, Method* b) {
1782 return a->name()->fast_compare(b->name());
1783 }
1784
1785 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1786 // default_methods also uses this without the ordering for fast find_method
1787 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1788 int length = methods->length();
1789 if (length > 1) {
1790 if (func == nullptr) {
1791 func = method_comparator;
1792 }
1793 {
1794 NoSafepointVerifier nsv;
1795 QuickSort::sort(methods->data(), length, func);
1796 }
1797 // Reset method ordering
1798 if (set_idnums) {
1799 for (u2 i = 0; i < length; i++) {
1800 Method* m = methods->at(i);
1801 m->set_method_idnum(i);
1802 m->set_orig_method_idnum(i);
1803 }
1804 }
1805 }
1806 }
1807
1808 //-----------------------------------------------------------------------------------
1809 // Non-product code unless JVM/TI needs it
1810
1811 #if !defined(PRODUCT) || INCLUDE_JVMTI
1812 class SignatureTypePrinter : public SignatureTypeNames {
1813 private:
1814 outputStream* _st;
1815 bool _use_separator;
1816
1817 void type_name(const char* name) {
1818 if (_use_separator) _st->print(", ");
1819 _st->print("%s", name);
1820 _use_separator = true;
1821 }
1822
1823 public:
1824 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1825 _st = st;
1826 _use_separator = false;
1827 }
1828
1829 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1830 void print_returntype() { _use_separator = false; do_type(return_type()); }
1831 };
1832
1833
1834 void Method::print_name(outputStream* st) const {
1835 Thread *thread = Thread::current();
1836 ResourceMark rm(thread);
1837 st->print("%s ", is_static() ? "static" : "virtual");
1838 if (WizardMode) {
1839 st->print("%s.", method_holder()->internal_name());
1840 name()->print_symbol_on(st);
1841 signature()->print_symbol_on(st);
1842 } else {
1843 SignatureTypePrinter sig(signature(), st);
1844 sig.print_returntype();
1845 st->print(" %s.", method_holder()->internal_name());
1846 name()->print_symbol_on(st);
1847 st->print("(");
1848 sig.print_parameters();
1849 st->print(")");
1850 }
1851 }
1852 #endif // !PRODUCT || INCLUDE_JVMTI
1853
1854
1855 void Method::print_codes_on(outputStream* st, int flags) const {
1856 print_codes_on(0, code_size(), st, flags);
1857 }
1858
1859 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1860 Thread *thread = Thread::current();
1861 ResourceMark rm(thread);
1862 methodHandle mh (thread, (Method*)this);
1863 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1864 }
1865
1866 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1867 _bci = 0;
1868 _line = 0;
1869 };
1870
1871 bool CompressedLineNumberReadStream::read_pair() {
1872 jubyte next = read_byte();
1873 // Check for terminator
1874 if (next == 0) return false;
1875 if (next == 0xFF) {
1876 // Escape character, regular compression used
1877 _bci += read_signed_int();
1878 _line += read_signed_int();
1879 } else {
1880 // Single byte compression used
1881 _bci += next >> 3;
1882 _line += next & 0x7;
1883 }
1884 return true;
1885 }
1886
1887 #if INCLUDE_JVMTI
1888
1889 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1890 BreakpointInfo* bp = method_holder()->breakpoints();
1891 for (; bp != nullptr; bp = bp->next()) {
1892 if (bp->match(this, bci)) {
1893 return bp->orig_bytecode();
1894 }
1895 }
1896 {
1897 ResourceMark rm;
1898 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1899 }
1900 return Bytecodes::_shouldnotreachhere;
1901 }
1902
1903 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1904 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1905 BreakpointInfo* bp = method_holder()->breakpoints();
1906 for (; bp != nullptr; bp = bp->next()) {
1907 if (bp->match(this, bci)) {
1908 bp->set_orig_bytecode(code);
1909 // and continue, in case there is more than one
1910 }
1911 }
1912 }
1913
1914 void Method::set_breakpoint(int bci) {
1915 InstanceKlass* ik = method_holder();
1916 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1917 bp->set_next(ik->breakpoints());
1918 ik->set_breakpoints(bp);
1919 // do this last:
1920 bp->set(this);
1921 }
1922
1923 static void clear_matches(Method* m, int bci) {
1924 InstanceKlass* ik = m->method_holder();
1925 BreakpointInfo* prev_bp = nullptr;
1926 BreakpointInfo* next_bp;
1927 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) {
1928 next_bp = bp->next();
1929 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1930 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1931 // do this first:
1932 bp->clear(m);
1933 // unhook it
1934 if (prev_bp != nullptr)
1935 prev_bp->set_next(next_bp);
1936 else
1937 ik->set_breakpoints(next_bp);
1938 delete bp;
1939 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1940 // at same location. So we have multiple matching (method_index and bci)
1941 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1942 // breakpoint for clear_breakpoint request and keep all other method versions
1943 // BreakpointInfo for future clear_breakpoint request.
1944 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1945 // which is being called when class is unloaded. We delete all the Breakpoint
1946 // information for all versions of method. We may not correctly restore the original
1947 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1948 // so these methods won't be used anymore.
1949 if (bci >= 0) {
1950 break;
1951 }
1952 } else {
1953 // This one is a keeper.
1954 prev_bp = bp;
1955 }
1956 }
1957 }
1958
1959 void Method::clear_breakpoint(int bci) {
1960 assert(bci >= 0, "");
1961 clear_matches(this, bci);
1962 }
1963
1964 void Method::clear_all_breakpoints() {
1965 clear_matches(this, -1);
1966 }
1967
1968 #endif // INCLUDE_JVMTI
1969
1970 int Method::invocation_count() const {
1971 MethodCounters* mcs = method_counters();
1972 MethodData* mdo = method_data();
1973 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) ||
1974 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) {
1975 return InvocationCounter::count_limit;
1976 } else {
1977 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) +
1978 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0);
1979 }
1980 }
1981
1982 int Method::backedge_count() const {
1983 MethodCounters* mcs = method_counters();
1984 MethodData* mdo = method_data();
1985 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) ||
1986 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) {
1987 return InvocationCounter::count_limit;
1988 } else {
1989 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) +
1990 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0);
1991 }
1992 }
1993
1994 int Method::highest_comp_level() const {
1995 const MethodCounters* mcs = method_counters();
1996 if (mcs != nullptr) {
1997 return mcs->highest_comp_level();
1998 } else {
1999 return CompLevel_none;
2000 }
2001 }
2002
2003 int Method::highest_osr_comp_level() const {
2004 const MethodCounters* mcs = method_counters();
2005 if (mcs != nullptr) {
2006 return mcs->highest_osr_comp_level();
2007 } else {
2008 return CompLevel_none;
2009 }
2010 }
2011
2012 void Method::set_highest_comp_level(int level) {
2013 MethodCounters* mcs = method_counters();
2014 if (mcs != nullptr) {
2015 mcs->set_highest_comp_level(level);
2016 }
2017 }
2018
2019 void Method::set_highest_osr_comp_level(int level) {
2020 MethodCounters* mcs = method_counters();
2021 if (mcs != nullptr) {
2022 mcs->set_highest_osr_comp_level(level);
2023 }
2024 }
2025
2026 #if INCLUDE_JVMTI
2027
2028 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2029 _bci = bci;
2030 _name_index = m->name_index();
2031 _signature_index = m->signature_index();
2032 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2033 if (_orig_bytecode == Bytecodes::_breakpoint)
2034 _orig_bytecode = m->orig_bytecode_at(_bci);
2035 _next = nullptr;
2036 }
2037
2038 void BreakpointInfo::set(Method* method) {
2039 #ifdef ASSERT
2040 {
2041 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2042 if (code == Bytecodes::_breakpoint)
2043 code = method->orig_bytecode_at(_bci);
2044 assert(orig_bytecode() == code, "original bytecode must be the same");
2045 }
2046 #endif
2047 Thread *thread = Thread::current();
2048 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2049 method->incr_number_of_breakpoints(thread);
2050 {
2051 // Deoptimize all dependents on this method
2052 HandleMark hm(thread);
2053 methodHandle mh(thread, method);
2054 CodeCache::mark_dependents_on_method_for_breakpoint(mh);
2055 }
2056 }
2057
2058 void BreakpointInfo::clear(Method* method) {
2059 *method->bcp_from(_bci) = orig_bytecode();
2060 assert(method->number_of_breakpoints() > 0, "must not go negative");
2061 method->decr_number_of_breakpoints(Thread::current());
2062 }
2063
2064 #endif // INCLUDE_JVMTI
2065
2066 // jmethodID handling
2067
2068 // This is a block allocating object, sort of like JNIHandleBlock, only a
2069 // lot simpler.
2070 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2071 // never get rid of it.
2072
2073 static const int min_block_size = 8;
2074
2075 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2076 friend class JNIMethodBlock;
2077 Method** _methods;
2078 int _number_of_methods;
2079 int _top;
2080 JNIMethodBlockNode* _next;
2081
2082 public:
2083
2084 JNIMethodBlockNode(int num_methods = min_block_size);
2085
2086 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2087
2088 void ensure_methods(int num_addl_methods) {
2089 if (_top < _number_of_methods) {
2090 num_addl_methods -= _number_of_methods - _top;
2091 if (num_addl_methods <= 0) {
2092 return;
2093 }
2094 }
2095 if (_next == nullptr) {
2096 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2097 } else {
2098 _next->ensure_methods(num_addl_methods);
2099 }
2100 }
2101 };
2102
2103 class JNIMethodBlock : public CHeapObj<mtClass> {
2104 JNIMethodBlockNode _head;
2105 JNIMethodBlockNode *_last_free;
2106 public:
2107 static Method* const _free_method;
2108
2109 JNIMethodBlock(int initial_capacity = min_block_size)
2110 : _head(initial_capacity), _last_free(&_head) {}
2111
2112 void ensure_methods(int num_addl_methods) {
2113 _last_free->ensure_methods(num_addl_methods);
2114 }
2115
2116 Method** add_method(Method* m) {
2117 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) {
2118 if (b->_top < b->_number_of_methods) {
2119 // top points to the next free entry.
2120 int i = b->_top;
2121 b->_methods[i] = m;
2122 b->_top++;
2123 _last_free = b;
2124 return &(b->_methods[i]);
2125 } else if (b->_top == b->_number_of_methods) {
2126 // if the next free entry ran off the block see if there's a free entry
2127 for (int i = 0; i < b->_number_of_methods; i++) {
2128 if (b->_methods[i] == _free_method) {
2129 b->_methods[i] = m;
2130 _last_free = b;
2131 return &(b->_methods[i]);
2132 }
2133 }
2134 // Only check each block once for frees. They're very unlikely.
2135 // Increment top past the end of the block.
2136 b->_top++;
2137 }
2138 // need to allocate a next block.
2139 if (b->_next == nullptr) {
2140 b->_next = _last_free = new JNIMethodBlockNode();
2141 }
2142 }
2143 guarantee(false, "Should always allocate a free block");
2144 return nullptr;
2145 }
2146
2147 bool contains(Method** m) {
2148 if (m == nullptr) return false;
2149 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2150 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2151 // This is a bit of extra checking, for two reasons. One is
2152 // that contains() deals with pointers that are passed in by
2153 // JNI code, so making sure that the pointer is aligned
2154 // correctly is valuable. The other is that <= and > are
2155 // technically not defined on pointers, so the if guard can
2156 // pass spuriously; no modern compiler is likely to make that
2157 // a problem, though (and if one did, the guard could also
2158 // fail spuriously, which would be bad).
2159 ptrdiff_t idx = m - b->_methods;
2160 if (b->_methods + idx == m) {
2161 return true;
2162 }
2163 }
2164 }
2165 return false; // not found
2166 }
2167
2168 // During class unloading the methods are cleared, which is different
2169 // than freed.
2170 void clear_all_methods() {
2171 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2172 for (int i = 0; i< b->_number_of_methods; i++) {
2173 b->_methods[i] = nullptr;
2174 }
2175 }
2176 }
2177 #ifndef PRODUCT
2178 int count_methods() {
2179 // count all allocated methods
2180 int count = 0;
2181 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) {
2182 for (int i = 0; i< b->_number_of_methods; i++) {
2183 if (b->_methods[i] != _free_method) count++;
2184 }
2185 }
2186 return count;
2187 }
2188 #endif // PRODUCT
2189 };
2190
2191 // Something that can't be mistaken for an address or a markWord
2192 Method* const JNIMethodBlock::_free_method = (Method*)55;
2193
2194 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) {
2195 _number_of_methods = MAX2(num_methods, min_block_size);
2196 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2197 for (int i = 0; i < _number_of_methods; i++) {
2198 _methods[i] = JNIMethodBlock::_free_method;
2199 }
2200 }
2201
2202 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2203 // Have to add jmethod_ids() to class loader data thread-safely.
2204 // Also have to add the method to the list safely, which the lock
2205 // protects as well.
2206 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2207 if (cld->jmethod_ids() == nullptr) {
2208 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2209 } else {
2210 cld->jmethod_ids()->ensure_methods(capacity);
2211 }
2212 }
2213
2214 // Add a method id to the jmethod_ids
2215 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2216 // Have to add jmethod_ids() to class loader data thread-safely.
2217 // Also have to add the method to the list safely, which the lock
2218 // protects as well.
2219 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2220
2221 ResourceMark rm;
2222 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name());
2223 if (cld->jmethod_ids() == nullptr) {
2224 cld->set_jmethod_ids(new JNIMethodBlock());
2225 }
2226 // jmethodID is a pointer to Method*
2227 return (jmethodID)cld->jmethod_ids()->add_method(m);
2228 }
2229
2230 jmethodID Method::jmethod_id() {
2231 methodHandle mh(Thread::current(), this);
2232 return method_holder()->get_jmethod_id(mh);
2233 }
2234
2235 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2236 // Can't assert the method_holder is the same because the new method has the
2237 // scratch method holder.
2238 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2239 == new_method->method_holder()->class_loader() ||
2240 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution
2241 "changing to a different class loader");
2242 // Just change the method in place, jmethodID pointer doesn't change.
2243 *((Method**)jmid) = new_method;
2244 }
2245
2246 bool Method::is_method_id(jmethodID mid) {
2247 Method* m = resolve_jmethod_id(mid);
2248 assert(m != nullptr, "should be called with non-null method");
2249 InstanceKlass* ik = m->method_holder();
2250 ClassLoaderData* cld = ik->class_loader_data();
2251 if (cld->jmethod_ids() == nullptr) return false;
2252 return (cld->jmethod_ids()->contains((Method**)mid));
2253 }
2254
2255 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2256 if (mid == nullptr) return nullptr;
2257 Method* o = resolve_jmethod_id(mid);
2258 if (o == nullptr || o == JNIMethodBlock::_free_method) {
2259 return nullptr;
2260 }
2261 // Method should otherwise be valid. Assert for testing.
2262 assert(is_valid_method(o), "should be valid jmethodid");
2263 // If the method's class holder object is unreferenced, but not yet marked as
2264 // unloaded, we need to return null here too because after a safepoint, its memory
2265 // will be reclaimed.
2266 return o->method_holder()->is_loader_alive() ? o : nullptr;
2267 };
2268
2269 void Method::set_on_stack(const bool value) {
2270 // Set both the method itself and its constant pool. The constant pool
2271 // on stack means some method referring to it is also on the stack.
2272 constants()->set_on_stack(value);
2273
2274 bool already_set = on_stack_flag();
2275 set_on_stack_flag(value);
2276 if (value && !already_set) {
2277 MetadataOnStackMark::record(this);
2278 }
2279 }
2280
2281 void Method::record_gc_epoch() {
2282 // If any method is on the stack in continuations, none of them can be reclaimed,
2283 // so save the marking cycle to check for the whole class in the cpCache.
2284 // The cpCache is writeable.
2285 constants()->cache()->record_gc_epoch();
2286 }
2287
2288 // Called when the class loader is unloaded to make all methods weak.
2289 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2290 loader_data->jmethod_ids()->clear_all_methods();
2291 }
2292
2293 void Method::clear_jmethod_id() {
2294 // Being at a safepoint prevents racing against other class redefinitions
2295 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
2296 // The jmethodID is not stored in the Method instance, we need to look it up first
2297 jmethodID methodid = find_jmethod_id_or_null();
2298 // We need to make sure that jmethodID actually resolves to this method
2299 // - multiple redefined versions may share jmethodID slots and if a method
2300 // has already been rewired to a newer version we could be removing reference
2301 // to a still existing method instance
2302 if (methodid != nullptr && *((Method**)methodid) == this) {
2303 *((Method**)methodid) = nullptr;
2304 }
2305 }
2306
2307 bool Method::has_method_vptr(const void* ptr) {
2308 Method m;
2309 // This assumes that the vtbl pointer is the first word of a C++ object.
2310 return dereference_vptr(&m) == dereference_vptr(ptr);
2311 }
2312
2313 // Check that this pointer is valid by checking that the vtbl pointer matches
2314 bool Method::is_valid_method(const Method* m) {
2315 if (m == nullptr) {
2316 return false;
2317 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2318 // Quick sanity check on pointer.
2319 return false;
2320 } else if (!os::is_readable_range(m, m + 1)) {
2321 return false;
2322 } else if (m->is_shared()) {
2323 return CppVtables::is_valid_shared_method(m);
2324 } else if (Metaspace::contains_non_shared(m)) {
2325 return has_method_vptr((const void*)m);
2326 } else {
2327 return false;
2328 }
2329 }
2330
2331 bool Method::is_scalarized_arg(int idx) const {
2332 if (!has_scalarized_args()) {
2333 return false;
2334 }
2335 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID
2336 int depth = 0;
2337 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2338 for (int i = 0; i < sig->length(); i++) {
2339 BasicType bt = sig->at(i)._bt;
2340 if (bt == T_METADATA) {
2341 depth++;
2342 }
2343 if (idx == 0) {
2344 break; // Argument found
2345 }
2346 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2347 depth--;
2348 }
2349 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2350 idx--; // Advance to next argument
2351 }
2352 }
2353 return depth != 0;
2354 }
2355
2356 #ifndef PRODUCT
2357 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2358 out->print("%d", loader_data->jmethod_ids()->count_methods());
2359 }
2360 #endif // PRODUCT
2361
2362
2363 // Printing
2364
2365 #ifndef PRODUCT
2366
2367 void Method::print_on(outputStream* st) const {
2368 ResourceMark rm;
2369 assert(is_method(), "must be method");
2370 st->print_cr("%s", internal_name());
2371 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2372 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2373 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2374 constants()->print_value_on(st); st->cr();
2375 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2376 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
2377 st->print (" - name: "); name()->print_value_on(st); st->cr();
2378 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2379 st->print_cr(" - max stack: %d", max_stack());
2380 st->print_cr(" - max locals: %d", max_locals());
2381 st->print_cr(" - size of params: %d", size_of_parameters());
2382 st->print_cr(" - method size: %d", method_size());
2383 if (intrinsic_id() != vmIntrinsics::_none)
2384 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2385 if (highest_comp_level() != CompLevel_none)
2386 st->print_cr(" - highest level: %d", highest_comp_level());
2387 st->print_cr(" - vtable index: %d", _vtable_index);
2388 #ifdef ASSERT
2389 if (valid_itable_index())
2390 st->print_cr(" - itable index: %d", itable_index());
2391 #endif
2392 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2393 st->print( " - adapters: ");
2394 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2395 if (a == nullptr)
2396 st->print_cr(PTR_FORMAT, p2i(a));
2397 else
2398 a->print_adapter_on(st);
2399 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2400 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2401 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry()));
2402 st->print_cr(" - code size: %d", code_size());
2403 if (code_size() != 0) {
2404 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2405 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2406 }
2407 if (method_data() != nullptr) {
2408 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2409 }
2410 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2411 if (checked_exceptions_length() > 0) {
2412 CheckedExceptionElement* table = checked_exceptions_start();
2413 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2414 if (Verbose) {
2415 for (int i = 0; i < checked_exceptions_length(); i++) {
2416 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2417 }
2418 }
2419 }
2420 if (has_linenumber_table()) {
2421 u_char* table = compressed_linenumber_table();
2422 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2423 if (Verbose) {
2424 CompressedLineNumberReadStream stream(table);
2425 while (stream.read_pair()) {
2426 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2427 }
2428 }
2429 }
2430 st->print_cr(" - localvar length: %d", localvariable_table_length());
2431 if (localvariable_table_length() > 0) {
2432 LocalVariableTableElement* table = localvariable_table_start();
2433 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2434 if (Verbose) {
2435 for (int i = 0; i < localvariable_table_length(); i++) {
2436 int bci = table[i].start_bci;
2437 int len = table[i].length;
2438 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2439 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2440 int slot = table[i].slot;
2441 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2442 }
2443 }
2444 }
2445 if (code() != nullptr) {
2446 st->print (" - compiled code: ");
2447 code()->print_value_on(st);
2448 }
2449 if (is_native()) {
2450 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2451 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2452 }
2453 }
2454
2455 void Method::print_linkage_flags(outputStream* st) {
2456 access_flags().print_on(st);
2457 if (is_default_method()) {
2458 st->print("default ");
2459 }
2460 if (is_overpass()) {
2461 st->print("overpass ");
2462 }
2463 }
2464 #endif //PRODUCT
2465
2466 void Method::print_value_on(outputStream* st) const {
2467 assert(is_method(), "must be method");
2468 st->print("%s", internal_name());
2469 print_address_on(st);
2470 st->print(" ");
2471 if (WizardMode) access_flags().print_on(st);
2472 name()->print_value_on(st);
2473 st->print(" ");
2474 signature()->print_value_on(st);
2475 st->print(" in ");
2476 method_holder()->print_value_on(st);
2477 if (WizardMode) st->print("#%d", _vtable_index);
2478 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2479 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code());
2480 }
2481
2482 // Verification
2483
2484 void Method::verify_on(outputStream* st) {
2485 guarantee(is_method(), "object must be method");
2486 guarantee(constants()->is_constantPool(), "should be constant pool");
2487 MethodData* md = method_data();
2488 guarantee(md == nullptr ||
2489 md->is_methodData(), "should be method data");
2490 }