1 /*
2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cppVtables.hpp"
27 #include "cds/metaspaceShared.hpp"
28 #include "classfile/classLoaderDataGraph.hpp"
29 #include "classfile/metadataOnStackMark.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/debugInfoRec.hpp"
35 #include "compiler/compilationPolicy.hpp"
36 #include "gc/shared/collectedHeap.inline.hpp"
37 #include "interpreter/bytecodeStream.hpp"
38 #include "interpreter/bytecodeTracer.hpp"
39 #include "interpreter/bytecodes.hpp"
40 #include "interpreter/interpreter.hpp"
41 #include "interpreter/oopMapCache.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logTag.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/metaspaceClosure.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/constMethod.hpp"
52 #include "oops/constantPool.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/method.inline.hpp"
55 #include "oops/methodData.hpp"
56 #include "oops/objArrayKlass.hpp"
57 #include "oops/objArrayOop.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/symbol.hpp"
60 #include "oops/inlineKlass.inline.hpp"
61 #include "prims/jvmtiExport.hpp"
62 #include "prims/methodHandles.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/atomic.hpp"
65 #include "runtime/continuationEntry.hpp"
66 #include "runtime/frame.inline.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/init.hpp"
69 #include "runtime/orderAccess.hpp"
70 #include "runtime/relocator.hpp"
71 #include "runtime/safepointVerifiers.hpp"
72 #include "runtime/sharedRuntime.hpp"
73 #include "runtime/signature.hpp"
74 #include "runtime/vm_version.hpp"
75 #include "services/memTracker.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/quickSort.hpp"
78 #include "utilities/vmError.hpp"
79 #include "utilities/xmlstream.hpp"
80
81 // Implementation of Method
82
83 Method* Method::allocate(ClassLoaderData* loader_data,
84 int byte_code_size,
85 AccessFlags access_flags,
86 InlineTableSizes* sizes,
87 ConstMethod::MethodType method_type,
88 Symbol* name,
89 TRAPS) {
90 assert(!access_flags.is_native() || byte_code_size == 0,
91 "native methods should not contain byte codes");
92 ConstMethod* cm = ConstMethod::allocate(loader_data,
93 byte_code_size,
94 sizes,
95 method_type,
96 CHECK_NULL);
97 int size = Method::size(access_flags.is_native());
98 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name);
99 }
100
101 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) {
102 NoSafepointVerifier no_safepoint;
103 set_constMethod(xconst);
104 set_access_flags(access_flags);
105 set_intrinsic_id(vmIntrinsics::_none);
106 set_force_inline(false);
107 set_hidden(false);
108 set_dont_inline(false);
109 set_changes_current_thread(false);
110 set_has_injected_profile(false);
111 set_method_data(NULL);
112 clear_method_counters();
113 set_vtable_index(Method::garbage_vtable_index);
114
115 // Fix and bury in Method*
116 set_interpreter_entry(NULL); // sets i2i entry and from_int
117 set_adapter_entry(NULL);
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(NULL);
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(NULL);
134 MetadataFactory::free_metadata(loader_data, method_data());
135 set_method_data(NULL);
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() != NULL) _code = NULL;
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() != NULL, "must have");
153 return adapter()->get_i2c_entry();
154 }
155
156 address Method::get_c2i_entry() {
157 assert(adapter() != NULL, "must have");
158 return adapter()->get_c2i_entry();
159 }
160
161 address Method::get_c2i_inline_entry() {
162 assert(adapter() != NULL, "must have");
163 return adapter()->get_c2i_inline_entry();
164 }
165
166 address Method::get_c2i_unverified_entry() {
167 assert(adapter() != NULL, "must have");
168 return adapter()->get_c2i_unverified_entry();
169 }
170
171 address Method::get_c2i_unverified_inline_entry() {
172 assert(adapter() != NULL, "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() != NULL, "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 == NULL ? "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 == NULL ? "NULL" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci);
274 }
275 return handler_bci;
276 } else if (ex_klass == NULL) {
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 != NULL, "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 == NULL ? "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 // Only GC uses the OopMapCache during thread stack root scanning
327 // any other uses generate an oopmap but do not save it in the cache.
328 if (Universe::heap()->is_gc_active()) {
329 method_holder()->mask_for(h_this, bci, mask);
330 } else {
331 OopMapCache::compute_one_oop_map(h_this, bci, mask);
332 }
333 return;
334 }
335
336
337 int Method::bci_from(address bcp) const {
338 if (is_native() && bcp == 0) {
339 return 0;
340 }
341 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code
342 // may call this after interrupting a nested ResourceMark.
343 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
344 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp));
345
346 return bcp - code_base();
347 }
348
349
350 int Method::validate_bci(int bci) const {
351 return (bci == 0 || bci < code_size()) ? bci : -1;
352 }
353
354 // Return bci if it appears to be a valid bcp
355 // Return -1 otherwise.
356 // Used by profiling code, when invalid data is a possibility.
357 // The caller is responsible for validating the Method* itself.
358 int Method::validate_bci_from_bcp(address bcp) const {
359 // keep bci as -1 if not a valid bci
360 int bci = -1;
361 if (bcp == 0 || bcp == code_base()) {
362 // code_size() may return 0 and we allow 0 here
363 // the method may be native
364 bci = 0;
365 } else if (contains(bcp)) {
366 bci = bcp - code_base();
367 }
368 // Assert that if we have dodged any asserts, bci is negative.
369 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
370 return bci;
371 }
372
373 address Method::bcp_from(int bci) const {
374 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
375 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
376 address bcp = code_base() + bci;
377 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
378 return bcp;
379 }
380
381 address Method::bcp_from(address bcp) const {
382 if (is_native() && bcp == NULL) {
383 return code_base();
384 } else {
385 return bcp;
386 }
387 }
388
389 int Method::size(bool is_native) {
390 // If native, then include pointers for native_function and signature_handler
391 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
392 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
393 return align_metadata_size(header_size() + extra_words);
394 }
395
396 Symbol* Method::klass_name() const {
397 return method_holder()->name();
398 }
399
400 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
401 log_trace(cds)("Iter(Method): %p", this);
402
403 if (!method_holder()->is_rewritten()) {
404 it->push(&_constMethod, MetaspaceClosure::_writable);
405 } else {
406 it->push(&_constMethod);
407 }
408 it->push(&_method_data);
409 it->push(&_method_counters);
410 NOT_PRODUCT(it->push(&_name);)
411 }
412
413 #if INCLUDE_CDS
414 // Attempt to return method to original state. Clear any pointers
415 // (to objects outside the shared spaces). We won't be able to predict
416 // where they should point in a new JVM. Further initialize some
417 // entries now in order allow them to be write protected later.
418
419 void Method::remove_unshareable_info() {
420 unlink_method();
421 JFR_ONLY(REMOVE_METHOD_ID(this);)
422 }
423
424 void Method::restore_unshareable_info(TRAPS) {
425 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored");
426 }
427 #endif
428
429 void Method::set_vtable_index(int index) {
430 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
431 // At runtime initialize_vtable is rerun as part of link_class_impl()
432 // for a shared class loaded by the non-boot loader to obtain the loader
433 // constraints based on the runtime classloaders' context.
434 return; // don't write into the shared class
435 } else {
436 _vtable_index = index;
437 }
438 }
439
440 void Method::set_itable_index(int index) {
441 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) {
442 // At runtime initialize_itable is rerun as part of link_class_impl()
443 // for a shared class loaded by the non-boot loader to obtain the loader
444 // constraints based on the runtime classloaders' context. The dumptime
445 // itable index should be the same as the runtime index.
446 assert(_vtable_index == itable_index_max - index,
447 "archived itable index is different from runtime index");
448 return; // don’t write into the shared class
449 } else {
450 _vtable_index = itable_index_max - index;
451 }
452 assert(valid_itable_index(), "");
453 }
454
455 // The RegisterNatives call being attempted tried to register with a method that
456 // is not native. Ask JVM TI what prefixes have been specified. Then check
457 // to see if the native method is now wrapped with the prefixes. See the
458 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
459 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) {
460 #if INCLUDE_JVMTI
461 ResourceMark rm(THREAD);
462 Method* method;
463 int name_len = name->utf8_length();
464 char* name_str = name->as_utf8();
465 int prefix_count;
466 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
467 for (int i = 0; i < prefix_count; i++) {
468 char* prefix = prefixes[i];
469 int prefix_len = (int)strlen(prefix);
470
471 // try adding this prefix to the method name and see if it matches another method name
472 int trial_len = name_len + prefix_len;
473 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
474 strcpy(trial_name_str, prefix);
475 strcat(trial_name_str, name_str);
476 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
477 if (trial_name == NULL) {
478 continue; // no such symbol, so this prefix wasn't used, try the next prefix
479 }
480 method = k->lookup_method(trial_name, signature);
481 if (method == NULL) {
482 continue; // signature doesn't match, try the next prefix
483 }
484 if (method->is_native()) {
485 method->set_is_prefixed_native();
486 return method; // wahoo, we found a prefixed version of the method, return it
487 }
488 // found as non-native, so prefix is good, add it, probably just need more prefixes
489 name_len = trial_len;
490 name_str = trial_name_str;
491 }
492 #endif // INCLUDE_JVMTI
493 return NULL; // not found
494 }
495
496 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) {
497 Method* method = k->lookup_method(name, signature);
498 if (method == NULL) {
499 ResourceMark rm(THREAD);
500 stringStream st;
501 st.print("Method '");
502 print_external_name(&st, k, name, signature);
503 st.print("' name or signature does not match");
504 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
505 }
506 if (!method->is_native()) {
507 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
508 method = find_prefixed_native(k, name, signature, THREAD);
509 if (method == NULL) {
510 ResourceMark rm(THREAD);
511 stringStream st;
512 st.print("Method '");
513 print_external_name(&st, k, name, signature);
514 st.print("' is not declared as native");
515 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
516 }
517 }
518
519 if (entry != NULL) {
520 method->set_native_function(entry, native_bind_event_is_interesting);
521 } else {
522 method->clear_native_function();
523 }
524 if (log_is_enabled(Debug, jni, resolve)) {
525 ResourceMark rm(THREAD);
526 log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
527 method->method_holder()->external_name(),
528 method->name()->as_C_string());
529 }
530 return true;
531 }
532
533 bool Method::was_executed_more_than(int n) {
534 // Invocation counter is reset when the Method* is compiled.
535 // If the method has compiled code we therefore assume it has
536 // be executed more than n times.
537 if (is_accessor() || is_empty_method() || (code() != NULL)) {
538 // interpreter doesn't bump invocation counter of trivial methods
539 // compiler does not bump invocation counter of compiled methods
540 return true;
541 }
542 else if ((method_counters() != NULL &&
543 method_counters()->invocation_counter()->carry()) ||
544 (method_data() != NULL &&
545 method_data()->invocation_counter()->carry())) {
546 // The carry bit is set when the counter overflows and causes
547 // a compilation to occur. We don't know how many times
548 // the counter has been reset, so we simply assume it has
549 // been executed more than n times.
550 return true;
551 } else {
552 return invocation_count() > n;
553 }
554 }
555
556 void Method::print_invocation_count() {
557 //---< compose+print method return type, klass, name, and signature >---
558 if (is_static()) tty->print("static ");
559 if (is_final()) tty->print("final ");
560 if (is_synchronized()) tty->print("synchronized ");
561 if (is_native()) tty->print("native ");
562 tty->print("%s::", method_holder()->external_name());
563 name()->print_symbol_on(tty);
564 signature()->print_symbol_on(tty);
565
566 if (WizardMode) {
567 // dump the size of the byte codes
568 tty->print(" {%d}", code_size());
569 }
570 tty->cr();
571
572 // Counting based on signed int counters tends to overflow with
573 // longer-running workloads on fast machines. The counters under
574 // consideration here, however, are limited in range by counting
575 // logic. See InvocationCounter:count_limit for example.
576 // No "overflow precautions" need to be implemented here.
577 tty->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count());
578 tty->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count());
579 tty->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count());
580
581 if (method_data() != NULL) {
582 tty->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count());
583 }
584
585 #ifndef PRODUCT
586 if (CountCompiledCalls) {
587 tty->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count());
588 }
589 #endif
590 }
591
592 // Build a MethodData* object to hold profiling information collected on this
593 // method when requested.
594 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) {
595 // Do not profile the method if metaspace has hit an OOM previously
596 // allocating profiling data. Callers clear pending exception so don't
597 // add one here.
598 if (ClassLoaderDataGraph::has_metaspace_oom()) {
599 return;
600 }
601
602 ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
603 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
604 if (HAS_PENDING_EXCEPTION) {
605 CompileBroker::log_metaspace_failure();
606 ClassLoaderDataGraph::set_metaspace_oom(true);
607 return; // return the exception (which is cleared)
608 }
609
610 if (!Atomic::replace_if_null(&method->_method_data, method_data)) {
611 MetadataFactory::free_metadata(loader_data, method_data);
612 return;
613 }
614
615 if (PrintMethodData && (Verbose || WizardMode)) {
616 ResourceMark rm(THREAD);
617 tty->print("build_profiling_method_data for ");
618 method->print_name(tty);
619 tty->cr();
620 // At the end of the run, the MDO, full of data, will be dumped.
621 }
622 }
623
624 MethodCounters* Method::build_method_counters(Thread* current, Method* m) {
625 // Do not profile the method if metaspace has hit an OOM previously
626 if (ClassLoaderDataGraph::has_metaspace_oom()) {
627 return NULL;
628 }
629
630 methodHandle mh(current, m);
631 MethodCounters* counters;
632 if (current->is_Java_thread()) {
633 JavaThread* THREAD = JavaThread::cast(current); // For exception macros.
634 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold
635 // if needed.
636 counters = MethodCounters::allocate_with_exception(mh, THREAD);
637 if (HAS_PENDING_EXCEPTION) {
638 CLEAR_PENDING_EXCEPTION;
639 }
640 } else {
641 // Call metaspace allocation that doesn't throw exception if the
642 // current thread isn't a JavaThread, ie. the VMThread.
643 counters = MethodCounters::allocate_no_exception(mh);
644 }
645
646 if (counters == NULL) {
647 CompileBroker::log_metaspace_failure();
648 ClassLoaderDataGraph::set_metaspace_oom(true);
649 return NULL;
650 }
651
652 if (!mh->init_method_counters(counters)) {
653 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
654 }
655
656 return mh->method_counters();
657 }
658
659 bool Method::init_method_counters(MethodCounters* counters) {
660 // Try to install a pointer to MethodCounters, return true on success.
661 return Atomic::replace_if_null(&_method_counters, counters);
662 }
663
664 int Method::extra_stack_words() {
665 // not an inline function, to avoid a header dependency on Interpreter
666 return extra_stack_entries() * Interpreter::stackElementSize;
667 }
668
669 // Derive size of parameters, return type, and fingerprint,
670 // all in one pass, which is run at load time.
671 // We need the first two, and might as well grab the third.
672 void Method::compute_from_signature(Symbol* sig) {
673 // At this point, since we are scanning the signature,
674 // we might as well compute the whole fingerprint.
675 Fingerprinter fp(sig, is_static());
676 set_size_of_parameters(fp.size_of_parameters());
677 set_num_stack_arg_slots(fp.num_stack_arg_slots());
678 constMethod()->set_result_type(fp.return_type());
679 constMethod()->set_fingerprint(fp.fingerprint());
680 }
681
682 // InlineKlass the method is declared to return. This must not
683 // safepoint as it is called with references live on the stack at
684 // locations the GC is unaware of.
685 InlineKlass* Method::returns_inline_type(Thread* thread) const {
686 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
687 NoSafepointVerifier nsv;
688 SignatureStream ss(signature());
689 while (!ss.at_return_type()) {
690 ss.next();
691 }
692 return ss.as_inline_klass(method_holder());
693 }
694
695 bool Method::is_vanilla_constructor() const {
696 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
697 // which only calls the superclass vanilla constructor and possibly does stores of
698 // zero constants to local fields:
699 //
700 // aload_0, _fast_aload_0, or _nofast_aload_0
701 // invokespecial
702 // indexbyte1
703 // indexbyte2
704 //
705 // followed by an (optional) sequence of:
706 //
707 // aload_0
708 // aconst_null / iconst_0 / fconst_0 / dconst_0
709 // putfield
710 // indexbyte1
711 // indexbyte2
712 //
713 // followed by:
714 //
715 // return
716
717 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors");
718 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
719 int size = code_size();
720 // Check if size match
721 if (size == 0 || size % 5 != 0) return false;
722 address cb = code_base();
723 int last = size - 1;
724 if ((cb[0] != Bytecodes::_aload_0 && cb[0] != Bytecodes::_fast_aload_0 && cb[0] != Bytecodes::_nofast_aload_0) ||
725 cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
726 // Does not call superclass default constructor
727 return false;
728 }
729 // Check optional sequence
730 for (int i = 4; i < last; i += 5) {
731 if (cb[i] != Bytecodes::_aload_0) return false;
732 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
733 if (cb[i+2] != Bytecodes::_putfield) return false;
734 }
735 return true;
736 }
737
738
739 bool Method::compute_has_loops_flag() {
740 BytecodeStream bcs(methodHandle(Thread::current(), this));
741 Bytecodes::Code bc;
742
743 while ((bc = bcs.next()) >= 0) {
744 switch (bc) {
745 case Bytecodes::_ifeq:
746 case Bytecodes::_ifnull:
747 case Bytecodes::_iflt:
748 case Bytecodes::_ifle:
749 case Bytecodes::_ifne:
750 case Bytecodes::_ifnonnull:
751 case Bytecodes::_ifgt:
752 case Bytecodes::_ifge:
753 case Bytecodes::_if_icmpeq:
754 case Bytecodes::_if_icmpne:
755 case Bytecodes::_if_icmplt:
756 case Bytecodes::_if_icmpgt:
757 case Bytecodes::_if_icmple:
758 case Bytecodes::_if_icmpge:
759 case Bytecodes::_if_acmpeq:
760 case Bytecodes::_if_acmpne:
761 case Bytecodes::_goto:
762 case Bytecodes::_jsr:
763 if (bcs.dest() < bcs.next_bci()) _access_flags.set_has_loops();
764 break;
765
766 case Bytecodes::_goto_w:
767 case Bytecodes::_jsr_w:
768 if (bcs.dest_w() < bcs.next_bci()) _access_flags.set_has_loops();
769 break;
770
771 case Bytecodes::_lookupswitch: {
772 Bytecode_lookupswitch lookupswitch(this, bcs.bcp());
773 if (lookupswitch.default_offset() < 0) {
774 _access_flags.set_has_loops();
775 } else {
776 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) {
777 LookupswitchPair pair = lookupswitch.pair_at(i);
778 if (pair.offset() < 0) {
779 _access_flags.set_has_loops();
780 break;
781 }
782 }
783 }
784 break;
785 }
786 case Bytecodes::_tableswitch: {
787 Bytecode_tableswitch tableswitch(this, bcs.bcp());
788 if (tableswitch.default_offset() < 0) {
789 _access_flags.set_has_loops();
790 } else {
791 for (int i = 0; i < tableswitch.length(); ++i) {
792 if (tableswitch.dest_offset_at(i) < 0) {
793 _access_flags.set_has_loops();
794 }
795 }
796 }
797 break;
798 }
799 default:
800 break;
801 }
802 }
803 _access_flags.set_loops_flag_init();
804 return _access_flags.has_loops();
805 }
806
807 bool Method::is_final_method(AccessFlags class_access_flags) const {
808 // or "does_not_require_vtable_entry"
809 // default method or overpass can occur, is not final (reuses vtable entry)
810 // private methods in classes get vtable entries for backward class compatibility.
811 if (is_overpass() || is_default_method()) return false;
812 return is_final() || class_access_flags.is_final();
813 }
814
815 bool Method::is_final_method() const {
816 return is_final_method(method_holder()->access_flags());
817 }
818
819 bool Method::is_default_method() const {
820 if (method_holder() != NULL &&
821 method_holder()->is_interface() &&
822 !is_abstract() && !is_private()) {
823 return true;
824 } else {
825 return false;
826 }
827 }
828
829 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
830 if (is_final_method(class_access_flags)) return true;
831 #ifdef ASSERT
832 bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
833 if (class_access_flags.is_interface()) {
834 ResourceMark rm;
835 assert(is_nonv == is_static() || is_nonv == is_private(),
836 "nonvirtual unexpected for non-static, non-private: %s",
837 name_and_sig_as_C_string());
838 }
839 #endif
840 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
841 return vtable_index() == nonvirtual_vtable_index;
842 }
843
844 bool Method::can_be_statically_bound() const {
845 return can_be_statically_bound(method_holder()->access_flags());
846 }
847
848 bool Method::can_be_statically_bound(InstanceKlass* context) const {
849 return (method_holder() == context) && can_be_statically_bound();
850 }
851
852 /**
853 * Returns false if this is one of specially treated methods for
854 * which we have to provide stack trace in throw in compiled code.
855 * Returns true otherwise.
856 */
857 bool Method::can_omit_stack_trace() {
858 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) {
859 return false; // All methods in sun.invoke.util.ValueConversions
860 }
861 return true;
862 }
863
864 bool Method::is_accessor() const {
865 return is_getter() || is_setter();
866 }
867
868 bool Method::is_getter() const {
869 if (code_size() != 5) return false;
870 if (size_of_parameters() != 1) return false;
871 if (java_code_at(0) != Bytecodes::_aload_0) return false;
872 if (java_code_at(1) != Bytecodes::_getfield) return false;
873 switch (java_code_at(4)) {
874 case Bytecodes::_ireturn:
875 case Bytecodes::_lreturn:
876 case Bytecodes::_freturn:
877 case Bytecodes::_dreturn:
878 case Bytecodes::_areturn:
879 break;
880 default:
881 return false;
882 }
883 if (has_scalarized_return()) {
884 // Don't treat this as (trivial) getter method because the
885 // inline type should be returned in a scalarized form.
886 return false;
887 }
888 return true;
889 }
890
891 bool Method::is_setter() const {
892 if (code_size() != 6) return false;
893 if (java_code_at(0) != Bytecodes::_aload_0) return false;
894 switch (java_code_at(1)) {
895 case Bytecodes::_iload_1:
896 case Bytecodes::_aload_1:
897 case Bytecodes::_fload_1:
898 if (size_of_parameters() != 2) return false;
899 break;
900 case Bytecodes::_dload_1:
901 case Bytecodes::_lload_1:
902 if (size_of_parameters() != 3) return false;
903 break;
904 default:
905 return false;
906 }
907 if (java_code_at(2) != Bytecodes::_putfield) return false;
908 if (java_code_at(5) != Bytecodes::_return) return false;
909 if (has_scalarized_args()) {
910 // Don't treat this as (trivial) setter method because the
911 // inline type argument should be passed in a scalarized form.
912 return false;
913 }
914 return true;
915 }
916
917 bool Method::is_constant_getter() const {
918 int last_index = code_size() - 1;
919 // Check if the first 1-3 bytecodes are a constant push
920 // and the last bytecode is a return.
921 return (2 <= code_size() && code_size() <= 4 &&
922 Bytecodes::is_const(java_code_at(0)) &&
923 Bytecodes::length_for(java_code_at(0)) == last_index &&
924 Bytecodes::is_return(java_code_at(last_index)) &&
925 !has_scalarized_args());
926 }
927
928 bool Method::is_object_constructor_or_class_initializer() const {
929 return (is_object_constructor() || is_class_initializer());
930 }
931
932 bool Method::is_class_initializer() const {
933 // For classfiles version 51 or greater, ensure that the clinit method is
934 // static. Non-static methods with the name "<clinit>" are not static
935 // initializers. (older classfiles exempted for backward compatibility)
936 return (name() == vmSymbols::class_initializer_name() &&
937 (is_static() ||
938 method_holder()->major_version() < 51));
939 }
940
941 // A method named <init>, is a classic object constructor.
942 bool Method::is_object_constructor() const {
943 return name() == vmSymbols::object_initializer_name();
944 }
945
946 // A method named <vnew> is a factory for an inline class.
947 bool Method::is_static_vnew_factory() const {
948 return name() == vmSymbols::inline_factory_name();
949 }
950
951 bool Method::needs_clinit_barrier() const {
952 return is_static() && !method_holder()->is_initialized();
953 }
954
955 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
956 int length = method->checked_exceptions_length();
957 if (length == 0) { // common case
958 return objArrayHandle(THREAD, Universe::the_empty_class_array());
959 } else {
960 methodHandle h_this(THREAD, method);
961 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
962 objArrayHandle mirrors (THREAD, m_oop);
963 for (int i = 0; i < length; i++) {
964 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
965 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
966 if (log_is_enabled(Warning, exceptions) &&
967 !k->is_subclass_of(vmClasses::Throwable_klass())) {
968 ResourceMark rm(THREAD);
969 log_warning(exceptions)(
970 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable",
971 k->external_name(), method->external_name());
972 }
973 mirrors->obj_at_put(i, k->java_mirror());
974 }
975 return mirrors;
976 }
977 };
978
979
980 int Method::line_number_from_bci(int bci) const {
981 int best_bci = 0;
982 int best_line = -1;
983 if (bci == SynchronizationEntryBCI) bci = 0;
984 if (0 <= bci && bci < code_size() && has_linenumber_table()) {
985 // The line numbers are a short array of 2-tuples [start_pc, line_number].
986 // Not necessarily sorted and not necessarily one-to-one.
987 CompressedLineNumberReadStream stream(compressed_linenumber_table());
988 while (stream.read_pair()) {
989 if (stream.bci() == bci) {
990 // perfect match
991 return stream.line();
992 } else {
993 // update best_bci/line
994 if (stream.bci() < bci && stream.bci() >= best_bci) {
995 best_bci = stream.bci();
996 best_line = stream.line();
997 }
998 }
999 }
1000 }
1001 return best_line;
1002 }
1003
1004
1005 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1006 if( constants()->tag_at(klass_index).is_unresolved_klass()) {
1007 Thread *thread = Thread::current();
1008 Symbol* klass_name = constants()->klass_name_at(klass_index);
1009 Handle loader(thread, method_holder()->class_loader());
1010 Handle prot (thread, method_holder()->protection_domain());
1011 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != NULL;
1012 } else {
1013 return true;
1014 }
1015 }
1016
1017
1018 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1019 int klass_index = constants()->klass_ref_index_at(refinfo_index);
1020 if (must_be_resolved) {
1021 // Make sure klass is resolved in constantpool.
1022 if (constants()->tag_at(klass_index).is_unresolved_klass()) {
1023 return false;
1024 }
1025 }
1026 return is_klass_loaded_by_klass_index(klass_index);
1027 }
1028
1029
1030 void Method::set_native_function(address function, bool post_event_flag) {
1031 assert(function != NULL, "use clear_native_function to unregister natives");
1032 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1033 address* native_function = native_function_addr();
1034
1035 // We can see racers trying to place the same native function into place. Once
1036 // is plenty.
1037 address current = *native_function;
1038 if (current == function) return;
1039 if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1040 function != NULL) {
1041 // native_method_throw_unsatisfied_link_error_entry() should only
1042 // be passed when post_event_flag is false.
1043 assert(function !=
1044 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1045 "post_event_flag mismatch");
1046
1047 // post the bind event, and possible change the bind function
1048 JvmtiExport::post_native_method_bind(this, &function);
1049 }
1050 *native_function = function;
1051 // This function can be called more than once. We must make sure that we always
1052 // use the latest registered method -> check if a stub already has been generated.
1053 // If so, we have to make it not_entrant.
1054 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
1055 if (nm != NULL) {
1056 nm->make_not_entrant();
1057 }
1058 }
1059
1060
1061 bool Method::has_native_function() const {
1062 if (is_special_native_intrinsic())
1063 return false; // special-cased in SharedRuntime::generate_native_wrapper
1064 address func = native_function();
1065 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
1066 }
1067
1068
1069 void Method::clear_native_function() {
1070 // Note: is_method_handle_intrinsic() is allowed here.
1071 set_native_function(
1072 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1073 !native_bind_event_is_interesting);
1074 this->unlink_code();
1075 }
1076
1077
1078 void Method::set_signature_handler(address handler) {
1079 address* signature_handler = signature_handler_addr();
1080 *signature_handler = handler;
1081 }
1082
1083
1084 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
1085 assert(reason != NULL, "must provide a reason");
1086 if (PrintCompilation && report) {
1087 ttyLocker ttyl;
1088 tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
1089 if (comp_level == CompLevel_all) {
1090 tty->print("all levels ");
1091 } else {
1092 tty->print("level %d ", comp_level);
1093 }
1094 this->print_short_name(tty);
1095 int size = this->code_size();
1096 if (size > 0) {
1097 tty->print(" (%d bytes)", size);
1098 }
1099 if (reason != NULL) {
1100 tty->print(" %s", reason);
1101 }
1102 tty->cr();
1103 }
1104 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
1105 ttyLocker ttyl;
1106 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
1107 os::current_thread_id(), is_osr, comp_level);
1108 if (reason != NULL) {
1109 xtty->print(" reason=\'%s\'", reason);
1110 }
1111 xtty->method(this);
1112 xtty->stamp();
1113 xtty->end_elem();
1114 }
1115 }
1116
1117 bool Method::is_always_compilable() const {
1118 // Generated adapters must be compiled
1119 if (is_special_native_intrinsic() && is_synthetic()) {
1120 assert(!is_not_c1_compilable(), "sanity check");
1121 assert(!is_not_c2_compilable(), "sanity check");
1122 return true;
1123 }
1124
1125 return false;
1126 }
1127
1128 bool Method::is_not_compilable(int comp_level) const {
1129 if (number_of_breakpoints() > 0)
1130 return true;
1131 if (is_always_compilable())
1132 return false;
1133 if (comp_level == CompLevel_any)
1134 return is_not_c1_compilable() && is_not_c2_compilable();
1135 if (is_c1_compile(comp_level))
1136 return is_not_c1_compilable();
1137 if (is_c2_compile(comp_level))
1138 return is_not_c2_compilable();
1139 return false;
1140 }
1141
1142 // call this when compiler finds that this method is not compilable
1143 void Method::set_not_compilable(const char* reason, int comp_level, bool report) {
1144 if (is_always_compilable()) {
1145 // Don't mark a method which should be always compilable
1146 return;
1147 }
1148 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
1149 if (comp_level == CompLevel_all) {
1150 set_not_c1_compilable();
1151 set_not_c2_compilable();
1152 } else {
1153 if (is_c1_compile(comp_level))
1154 set_not_c1_compilable();
1155 if (is_c2_compile(comp_level))
1156 set_not_c2_compilable();
1157 }
1158 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1159 }
1160
1161 bool Method::is_not_osr_compilable(int comp_level) const {
1162 if (is_not_compilable(comp_level))
1163 return true;
1164 if (comp_level == CompLevel_any)
1165 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable();
1166 if (is_c1_compile(comp_level))
1167 return is_not_c1_osr_compilable();
1168 if (is_c2_compile(comp_level))
1169 return is_not_c2_osr_compilable();
1170 return false;
1171 }
1172
1173 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1174 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1175 if (comp_level == CompLevel_all) {
1176 set_not_c1_osr_compilable();
1177 set_not_c2_osr_compilable();
1178 } else {
1179 if (is_c1_compile(comp_level))
1180 set_not_c1_osr_compilable();
1181 if (is_c2_compile(comp_level))
1182 set_not_c2_osr_compilable();
1183 }
1184 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1185 }
1186
1187 // Revert to using the interpreter and clear out the nmethod
1188 void Method::clear_code() {
1189 // this may be NULL if c2i adapters have not been made yet
1190 // Only should happen at allocate time.
1191 if (adapter() == NULL) {
1192 _from_compiled_entry = NULL;
1193 _from_compiled_inline_entry = NULL;
1194 _from_compiled_inline_ro_entry = NULL;
1195 } else {
1196 _from_compiled_entry = adapter()->get_c2i_entry();
1197 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1198 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1199 }
1200 OrderAccess::storestore();
1201 _from_interpreted_entry = _i2i_entry;
1202 OrderAccess::storestore();
1203 _code = NULL;
1204 }
1205
1206 void Method::unlink_code(CompiledMethod *compare) {
1207 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1208 // We need to check if either the _code or _from_compiled_code_entry_point
1209 // refer to this nmethod because there is a race in setting these two fields
1210 // in Method* as seen in bugid 4947125.
1211 if (code() == compare ||
1212 from_compiled_entry() == compare->verified_entry_point()) {
1213 clear_code();
1214 }
1215 }
1216
1217 void Method::unlink_code() {
1218 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1219 clear_code();
1220 }
1221
1222 #if INCLUDE_CDS
1223 // Called by class data sharing to remove any entry points (which are not shared)
1224 void Method::unlink_method() {
1225 Arguments::assert_is_dumping_archive();
1226 _code = NULL;
1227 _adapter = NULL;
1228 _i2i_entry = NULL;
1229 _from_compiled_entry = NULL;
1230 _from_compiled_inline_entry = NULL;
1231 _from_compiled_inline_ro_entry = NULL;
1232 _from_interpreted_entry = NULL;
1233
1234 if (is_native()) {
1235 *native_function_addr() = NULL;
1236 set_signature_handler(NULL);
1237 }
1238 NOT_PRODUCT(set_compiled_invocation_count(0);)
1239
1240 set_method_data(NULL);
1241 clear_method_counters();
1242 }
1243 #endif
1244
1245 // Called when the method_holder is getting linked. Setup entrypoints so the method
1246 // is ready to be called from interpreter, compiler, and vtables.
1247 void Method::link_method(const methodHandle& h_method, TRAPS) {
1248 // If the code cache is full, we may reenter this function for the
1249 // leftover methods that weren't linked.
1250 if (adapter() != NULL) {
1251 return;
1252 }
1253 assert( _code == NULL, "nothing compiled yet" );
1254
1255 // Setup interpreter entrypoint
1256 assert(this == h_method(), "wrong h_method()" );
1257
1258 assert(adapter() == NULL, "init'd to NULL");
1259 address entry = Interpreter::entry_for_method(h_method);
1260 assert(entry != NULL, "interpreter entry must be non-null");
1261 // Sets both _i2i_entry and _from_interpreted_entry
1262 set_interpreter_entry(entry);
1263
1264 // Don't overwrite already registered native entries.
1265 if (is_native() && !has_native_function()) {
1266 set_native_function(
1267 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1268 !native_bind_event_is_interesting);
1269 }
1270 if (InlineTypeReturnedAsFields && returns_inline_type(THREAD)) {
1271 set_has_scalarized_return(true);
1272 }
1273
1274 // Setup compiler entrypoint. This is made eagerly, so we do not need
1275 // special handling of vtables. An alternative is to make adapters more
1276 // lazily by calling make_adapter() from from_compiled_entry() for the
1277 // normal calls. For vtable calls life gets more complicated. When a
1278 // call-site goes mega-morphic we need adapters in all methods which can be
1279 // called from the vtable. We need adapters on such methods that get loaded
1280 // later. Ditto for mega-morphic itable calls. If this proves to be a
1281 // problem we'll make these lazily later.
1282 (void) make_adapters(h_method, CHECK);
1283
1284 // ONLY USE the h_method now as make_adapter may have blocked
1285
1286 if (h_method->is_continuation_native_intrinsic()) {
1287 // the entry points to this method will be set in set_code, called when first resolving this method
1288 _from_interpreted_entry = NULL;
1289 _from_compiled_entry = NULL;
1290 _i2i_entry = NULL;
1291 }
1292 }
1293
1294 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1295 // Adapters for compiled code are made eagerly here. They are fairly
1296 // small (generally < 100 bytes) and quick to make (and cached and shared)
1297 // so making them eagerly shouldn't be too expensive.
1298 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1299 if (adapter == NULL ) {
1300 if (!is_init_completed()) {
1301 // Don't throw exceptions during VM initialization because java.lang.* classes
1302 // might not have been initialized, causing problems when constructing the
1303 // Java exception object.
1304 vm_exit_during_initialization("Out of space in CodeCache for adapters");
1305 } else {
1306 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1307 }
1308 }
1309
1310 mh->set_adapter_entry(adapter);
1311 mh->_from_compiled_entry = adapter->get_c2i_entry();
1312 mh->_from_compiled_inline_entry = adapter->get_c2i_inline_entry();
1313 mh->_from_compiled_inline_ro_entry = adapter->get_c2i_inline_ro_entry();
1314 return adapter->get_c2i_entry();
1315 }
1316
1317 // The verified_code_entry() must be called when a invoke is resolved
1318 // on this method.
1319
1320 // It returns the compiled code entry point, after asserting not null.
1321 // This function is called after potential safepoints so that nmethod
1322 // or adapter that it points to is still live and valid.
1323 // This function must not hit a safepoint!
1324 address Method::verified_code_entry() {
1325 debug_only(NoSafepointVerifier nsv;)
1326 assert(_from_compiled_entry != NULL, "must be set");
1327 return _from_compiled_entry;
1328 }
1329
1330 address Method::verified_inline_code_entry() {
1331 debug_only(NoSafepointVerifier nsv;)
1332 assert(_from_compiled_inline_entry != NULL, "must be set");
1333 return _from_compiled_inline_entry;
1334 }
1335
1336 address Method::verified_inline_ro_code_entry() {
1337 debug_only(NoSafepointVerifier nsv;)
1338 assert(_from_compiled_inline_ro_entry != NULL, "must be set");
1339 return _from_compiled_inline_ro_entry;
1340 }
1341
1342 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1343 // (could be racing a deopt).
1344 // Not inline to avoid circular ref.
1345 bool Method::check_code() const {
1346 // cached in a register or local. There's a race on the value of the field.
1347 CompiledMethod *code = Atomic::load_acquire(&_code);
1348 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1349 }
1350
1351 // Install compiled code. Instantly it can execute.
1352 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1353 assert_lock_strong(CompiledMethod_lock);
1354 assert( code, "use clear_code to remove code" );
1355 assert( mh->check_code(), "" );
1356
1357 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1358
1359 // These writes must happen in this order, because the interpreter will
1360 // directly jump to from_interpreted_entry which jumps to an i2c adapter
1361 // which jumps to _from_compiled_entry.
1362 mh->_code = code; // Assign before allowing compiled code to exec
1363
1364 int comp_level = code->comp_level();
1365 // In theory there could be a race here. In practice it is unlikely
1366 // and not worth worrying about.
1367 if (comp_level > mh->highest_comp_level()) {
1368 mh->set_highest_comp_level(comp_level);
1369 }
1370
1371 OrderAccess::storestore();
1372 mh->_from_compiled_entry = code->verified_entry_point();
1373 mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1374 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1375 OrderAccess::storestore();
1376
1377 if (mh->is_continuation_native_intrinsic()) {
1378 assert(mh->_from_interpreted_entry == NULL, "initialized incorrectly"); // see link_method
1379
1380 if (mh->is_continuation_enter_intrinsic()) {
1381 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1382 mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1383 } else if (mh->is_continuation_yield_intrinsic()) {
1384 mh->_i2i_entry = mh->get_i2c_entry();
1385 } else {
1386 guarantee(false, "Unknown Continuation native intrinsic");
1387 }
1388 // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1389 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1390 } else if (!mh->is_method_handle_intrinsic()) {
1391 // Instantly compiled code can execute.
1392 mh->_from_interpreted_entry = mh->get_i2c_entry();
1393 }
1394 }
1395
1396
1397 bool Method::is_overridden_in(Klass* k) const {
1398 InstanceKlass* ik = InstanceKlass::cast(k);
1399
1400 if (ik->is_interface()) return false;
1401
1402 // If method is an interface, we skip it - except if it
1403 // is a miranda method
1404 if (method_holder()->is_interface()) {
1405 // Check that method is not a miranda method
1406 if (ik->lookup_method(name(), signature()) == NULL) {
1407 // No implementation exist - so miranda method
1408 return false;
1409 }
1410 return true;
1411 }
1412
1413 assert(ik->is_subclass_of(method_holder()), "should be subklass");
1414 if (!has_vtable_index()) {
1415 return false;
1416 } else {
1417 Method* vt_m = ik->method_at_vtable(vtable_index());
1418 return vt_m != this;
1419 }
1420 }
1421
1422
1423 // give advice about whether this Method* should be cached or not
1424 bool Method::should_not_be_cached() const {
1425 if (is_old()) {
1426 // This method has been redefined. It is either EMCP or obsolete
1427 // and we don't want to cache it because that would pin the method
1428 // down and prevent it from being collectible if and when it
1429 // finishes executing.
1430 return true;
1431 }
1432
1433 // caching this method should be just fine
1434 return false;
1435 }
1436
1437
1438 /**
1439 * Returns true if this is one of the specially treated methods for
1440 * security related stack walks (like Reflection.getCallerClass).
1441 */
1442 bool Method::is_ignored_by_security_stack_walk() const {
1443 if (intrinsic_id() == vmIntrinsics::_invoke) {
1444 // This is Method.invoke() -- ignore it
1445 return true;
1446 }
1447 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) {
1448 // This is an auxiliary frame -- ignore it
1449 return true;
1450 }
1451 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1452 // This is an internal adapter frame for method handles -- ignore it
1453 return true;
1454 }
1455 return false;
1456 }
1457
1458
1459 // Constant pool structure for invoke methods:
1460 enum {
1461 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc.
1462 _imcp_invoke_signature, // utf8: (variable Symbol*)
1463 _imcp_limit
1464 };
1465
1466 // Test if this method is an MH adapter frame generated by Java code.
1467 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1468 bool Method::is_compiled_lambda_form() const {
1469 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1470 }
1471
1472 // Test if this method is an internal MH primitive method.
1473 bool Method::is_method_handle_intrinsic() const {
1474 vmIntrinsics::ID iid = intrinsic_id();
1475 return (MethodHandles::is_signature_polymorphic(iid) &&
1476 MethodHandles::is_signature_polymorphic_intrinsic(iid));
1477 }
1478
1479 bool Method::has_member_arg() const {
1480 vmIntrinsics::ID iid = intrinsic_id();
1481 return (MethodHandles::is_signature_polymorphic(iid) &&
1482 MethodHandles::has_member_arg(iid));
1483 }
1484
1485 // Make an instance of a signature-polymorphic internal MH primitive.
1486 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1487 Symbol* signature,
1488 TRAPS) {
1489 ResourceMark rm(THREAD);
1490 methodHandle empty;
1491
1492 InstanceKlass* holder = vmClasses::MethodHandle_klass();
1493 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1494 assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1495
1496 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1497
1498 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1499 name->increment_refcount();
1500 signature->increment_refcount();
1501
1502 int cp_length = _imcp_limit;
1503 ClassLoaderData* loader_data = holder->class_loader_data();
1504 constantPoolHandle cp;
1505 {
1506 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1507 cp = constantPoolHandle(THREAD, cp_oop);
1508 }
1509 cp->copy_fields(holder->constants());
1510 cp->set_pool_holder(holder);
1511 cp->symbol_at_put(_imcp_invoke_name, name);
1512 cp->symbol_at_put(_imcp_invoke_signature, signature);
1513 cp->set_has_preresolution();
1514
1515 // decide on access bits: public or not?
1516 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1517 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1518 if (must_be_static) flags_bits |= JVM_ACC_STATIC;
1519 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1520
1521 methodHandle m;
1522 {
1523 InlineTableSizes sizes;
1524 Method* m_oop = Method::allocate(loader_data, 0,
1525 accessFlags_from(flags_bits), &sizes,
1526 ConstMethod::NORMAL,
1527 name,
1528 CHECK_(empty));
1529 m = methodHandle(THREAD, m_oop);
1530 }
1531 m->set_constants(cp());
1532 m->set_name_index(_imcp_invoke_name);
1533 m->set_signature_index(_imcp_invoke_signature);
1534 assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1535 assert(m->signature() == signature, "");
1536 m->compute_from_signature(signature);
1537 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder()));
1538 assert(m->is_method_handle_intrinsic(), "");
1539 #ifdef ASSERT
1540 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print();
1541 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1542 assert(m->intrinsic_id() == iid, "correctly predicted iid");
1543 #endif //ASSERT
1544
1545 // Finally, set up its entry points.
1546 assert(m->can_be_statically_bound(), "");
1547 m->set_vtable_index(Method::nonvirtual_vtable_index);
1548 m->link_method(m, CHECK_(empty));
1549
1550 if (iid == vmIntrinsics::_linkToNative) {
1551 m->set_interpreter_entry(m->adapter()->get_i2c_entry());
1552 }
1553 if (log_is_enabled(Debug, methodhandles)) {
1554 LogTarget(Debug, methodhandles) lt;
1555 LogStream ls(lt);
1556 m->print_on(&ls);
1557 }
1558
1559 return m;
1560 }
1561
1562 Klass* Method::check_non_bcp_klass(Klass* klass) {
1563 if (klass != NULL && klass->class_loader() != NULL) {
1564 if (klass->is_objArray_klass())
1565 klass = ObjArrayKlass::cast(klass)->bottom_klass();
1566 return klass;
1567 }
1568 return NULL;
1569 }
1570
1571
1572 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1573 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1574 // Code below does not work for native methods - they should never get rewritten anyway
1575 assert(!m->is_native(), "cannot rewrite native methods");
1576 // Allocate new Method*
1577 AccessFlags flags = m->access_flags();
1578
1579 ConstMethod* cm = m->constMethod();
1580 int checked_exceptions_len = cm->checked_exceptions_length();
1581 int localvariable_len = cm->localvariable_table_length();
1582 int exception_table_len = cm->exception_table_length();
1583 int method_parameters_len = cm->method_parameters_length();
1584 int method_annotations_len = cm->method_annotations_length();
1585 int parameter_annotations_len = cm->parameter_annotations_length();
1586 int type_annotations_len = cm->type_annotations_length();
1587 int default_annotations_len = cm->default_annotations_length();
1588
1589 InlineTableSizes sizes(
1590 localvariable_len,
1591 new_compressed_linenumber_size,
1592 exception_table_len,
1593 checked_exceptions_len,
1594 method_parameters_len,
1595 cm->generic_signature_index(),
1596 method_annotations_len,
1597 parameter_annotations_len,
1598 type_annotations_len,
1599 default_annotations_len,
1600 0);
1601
1602 ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1603 Method* newm_oop = Method::allocate(loader_data,
1604 new_code_length,
1605 flags,
1606 &sizes,
1607 m->method_type(),
1608 m->name(),
1609 CHECK_(methodHandle()));
1610 methodHandle newm (THREAD, newm_oop);
1611
1612 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1613 ConstMethod* newcm = newm->constMethod();
1614 int new_const_method_size = newm->constMethod()->size();
1615
1616 // This works because the source and target are both Methods. Some compilers
1617 // (e.g., clang) complain that the target vtable pointer will be stomped,
1618 // so cast away newm()'s and m()'s Methodness.
1619 memcpy((void*)newm(), (void*)m(), sizeof(Method));
1620
1621 // Create shallow copy of ConstMethod.
1622 memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1623
1624 // Reset correct method/const method, method size, and parameter info
1625 newm->set_constMethod(newcm);
1626 newm->constMethod()->set_code_size(new_code_length);
1627 newm->constMethod()->set_constMethod_size(new_const_method_size);
1628 assert(newm->code_size() == new_code_length, "check");
1629 assert(newm->method_parameters_length() == method_parameters_len, "check");
1630 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1631 assert(newm->exception_table_length() == exception_table_len, "check");
1632 assert(newm->localvariable_table_length() == localvariable_len, "check");
1633 // Copy new byte codes
1634 memcpy(newm->code_base(), new_code, new_code_length);
1635 // Copy line number table
1636 if (new_compressed_linenumber_size > 0) {
1637 memcpy(newm->compressed_linenumber_table(),
1638 new_compressed_linenumber_table,
1639 new_compressed_linenumber_size);
1640 }
1641 // Copy method_parameters
1642 if (method_parameters_len > 0) {
1643 memcpy(newm->method_parameters_start(),
1644 m->method_parameters_start(),
1645 method_parameters_len * sizeof(MethodParametersElement));
1646 }
1647 // Copy checked_exceptions
1648 if (checked_exceptions_len > 0) {
1649 memcpy(newm->checked_exceptions_start(),
1650 m->checked_exceptions_start(),
1651 checked_exceptions_len * sizeof(CheckedExceptionElement));
1652 }
1653 // Copy exception table
1654 if (exception_table_len > 0) {
1655 memcpy(newm->exception_table_start(),
1656 m->exception_table_start(),
1657 exception_table_len * sizeof(ExceptionTableElement));
1658 }
1659 // Copy local variable number table
1660 if (localvariable_len > 0) {
1661 memcpy(newm->localvariable_table_start(),
1662 m->localvariable_table_start(),
1663 localvariable_len * sizeof(LocalVariableTableElement));
1664 }
1665 // Copy stackmap table
1666 if (m->has_stackmap_table()) {
1667 int code_attribute_length = m->stackmap_data()->length();
1668 Array<u1>* stackmap_data =
1669 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle()));
1670 memcpy((void*)stackmap_data->adr_at(0),
1671 (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1672 newm->set_stackmap_data(stackmap_data);
1673 }
1674
1675 // copy annotations over to new method
1676 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle()));
1677 return newm;
1678 }
1679
1680 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) {
1681 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1682 // because we are not loading from core libraries
1683 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1684 // which does not use the class default class loader so we check for its loader here
1685 const InstanceKlass* ik = InstanceKlass::cast(holder);
1686 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1687 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here
1688 }
1689
1690 // see if the klass name is well-known:
1691 Symbol* klass_name = ik->name();
1692 vmSymbolID id = vmSymbols::find_sid(klass_name);
1693 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) {
1694 return id;
1695 } else {
1696 return vmSymbolID::NO_SID;
1697 }
1698 }
1699
1700 void Method::init_intrinsic_id(vmSymbolID klass_id) {
1701 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once");
1702 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1703 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1704 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1705
1706 // the klass name is well-known:
1707 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be");
1708 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility");
1709
1710 // ditto for method and signature:
1711 vmSymbolID name_id = vmSymbols::find_sid(name());
1712 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1713 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1714 && name_id == vmSymbolID::NO_SID) {
1715 return;
1716 }
1717 vmSymbolID sig_id = vmSymbols::find_sid(signature());
1718 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1719 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1720 && sig_id == vmSymbolID::NO_SID) {
1721 return;
1722 }
1723 jshort flags = access_flags().as_short();
1724
1725 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1726 if (id != vmIntrinsics::_none) {
1727 set_intrinsic_id(id);
1728 if (id == vmIntrinsics::_Class_cast) {
1729 // Even if the intrinsic is rejected, we want to inline this simple method.
1730 set_force_inline(true);
1731 }
1732 return;
1733 }
1734
1735 // A few slightly irregular cases:
1736 switch (klass_id) {
1737 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1738 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1739 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1740 if (!is_native()) break;
1741 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1742 if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1743 id = vmIntrinsics::_none;
1744 break;
1745
1746 default:
1747 break;
1748 }
1749
1750 if (id != vmIntrinsics::_none) {
1751 // Set up its iid. It is an alias method.
1752 set_intrinsic_id(id);
1753 return;
1754 }
1755 }
1756
1757 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1758 if (!THREAD->can_call_java()) {
1759 // There is nothing useful this routine can do from within the Compile thread.
1760 // Hopefully, the signature contains only well-known classes.
1761 // We could scan for this and return true/false, but the caller won't care.
1762 return false;
1763 }
1764 bool sig_is_loaded = true;
1765 ResourceMark rm(THREAD);
1766 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) {
1767 if (ss.is_reference()) {
1768 // load everything, including arrays "[Lfoo;"
1769 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD);
1770 // We are loading classes eagerly. If a ClassNotFoundException or
1771 // a LinkageError was generated, be sure to ignore it.
1772 if (HAS_PENDING_EXCEPTION) {
1773 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) ||
1774 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) {
1775 CLEAR_PENDING_EXCEPTION;
1776 } else {
1777 return false;
1778 }
1779 }
1780 if( klass == NULL) { sig_is_loaded = false; }
1781 }
1782 }
1783 return sig_is_loaded;
1784 }
1785
1786 // Exposed so field engineers can debug VM
1787 void Method::print_short_name(outputStream* st) const {
1788 ResourceMark rm;
1789 #ifdef PRODUCT
1790 st->print(" %s::", method_holder()->external_name());
1791 #else
1792 st->print(" %s::", method_holder()->internal_name());
1793 #endif
1794 name()->print_symbol_on(st);
1795 if (WizardMode) signature()->print_symbol_on(st);
1796 else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1797 MethodHandles::print_as_basic_type_signature_on(st, signature());
1798 }
1799
1800 // Comparer for sorting an object array containing
1801 // Method*s.
1802 static int method_comparator(Method* a, Method* b) {
1803 return a->name()->fast_compare(b->name());
1804 }
1805
1806 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1807 // default_methods also uses this without the ordering for fast find_method
1808 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) {
1809 int length = methods->length();
1810 if (length > 1) {
1811 if (func == NULL) {
1812 func = method_comparator;
1813 }
1814 {
1815 NoSafepointVerifier nsv;
1816 QuickSort::sort(methods->data(), length, func, /*idempotent=*/false);
1817 }
1818 // Reset method ordering
1819 if (set_idnums) {
1820 for (int i = 0; i < length; i++) {
1821 Method* m = methods->at(i);
1822 m->set_method_idnum(i);
1823 m->set_orig_method_idnum(i);
1824 }
1825 }
1826 }
1827 }
1828
1829 //-----------------------------------------------------------------------------------
1830 // Non-product code unless JVM/TI needs it
1831
1832 #if !defined(PRODUCT) || INCLUDE_JVMTI
1833 class SignatureTypePrinter : public SignatureTypeNames {
1834 private:
1835 outputStream* _st;
1836 bool _use_separator;
1837
1838 void type_name(const char* name) {
1839 if (_use_separator) _st->print(", ");
1840 _st->print("%s", name);
1841 _use_separator = true;
1842 }
1843
1844 public:
1845 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1846 _st = st;
1847 _use_separator = false;
1848 }
1849
1850 void print_parameters() { _use_separator = false; do_parameters_on(this); }
1851 void print_returntype() { _use_separator = false; do_type(return_type()); }
1852 };
1853
1854
1855 void Method::print_name(outputStream* st) const {
1856 Thread *thread = Thread::current();
1857 ResourceMark rm(thread);
1858 st->print("%s ", is_static() ? "static" : "virtual");
1859 if (WizardMode) {
1860 st->print("%s.", method_holder()->internal_name());
1861 name()->print_symbol_on(st);
1862 signature()->print_symbol_on(st);
1863 } else {
1864 SignatureTypePrinter sig(signature(), st);
1865 sig.print_returntype();
1866 st->print(" %s.", method_holder()->internal_name());
1867 name()->print_symbol_on(st);
1868 st->print("(");
1869 sig.print_parameters();
1870 st->print(")");
1871 }
1872 }
1873 #endif // !PRODUCT || INCLUDE_JVMTI
1874
1875
1876 void Method::print_codes_on(outputStream* st, int flags) const {
1877 print_codes_on(0, code_size(), st, flags);
1878 }
1879
1880 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const {
1881 Thread *thread = Thread::current();
1882 ResourceMark rm(thread);
1883 methodHandle mh (thread, (Method*)this);
1884 BytecodeTracer::print_method_codes(mh, from, to, st, flags);
1885 }
1886
1887 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1888 _bci = 0;
1889 _line = 0;
1890 };
1891
1892 bool CompressedLineNumberReadStream::read_pair() {
1893 jubyte next = read_byte();
1894 // Check for terminator
1895 if (next == 0) return false;
1896 if (next == 0xFF) {
1897 // Escape character, regular compression used
1898 _bci += read_signed_int();
1899 _line += read_signed_int();
1900 } else {
1901 // Single byte compression used
1902 _bci += next >> 3;
1903 _line += next & 0x7;
1904 }
1905 return true;
1906 }
1907
1908 #if INCLUDE_JVMTI
1909
1910 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1911 BreakpointInfo* bp = method_holder()->breakpoints();
1912 for (; bp != NULL; bp = bp->next()) {
1913 if (bp->match(this, bci)) {
1914 return bp->orig_bytecode();
1915 }
1916 }
1917 {
1918 ResourceMark rm;
1919 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1920 }
1921 return Bytecodes::_shouldnotreachhere;
1922 }
1923
1924 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1925 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1926 BreakpointInfo* bp = method_holder()->breakpoints();
1927 for (; bp != NULL; bp = bp->next()) {
1928 if (bp->match(this, bci)) {
1929 bp->set_orig_bytecode(code);
1930 // and continue, in case there is more than one
1931 }
1932 }
1933 }
1934
1935 void Method::set_breakpoint(int bci) {
1936 InstanceKlass* ik = method_holder();
1937 BreakpointInfo *bp = new BreakpointInfo(this, bci);
1938 bp->set_next(ik->breakpoints());
1939 ik->set_breakpoints(bp);
1940 // do this last:
1941 bp->set(this);
1942 }
1943
1944 static void clear_matches(Method* m, int bci) {
1945 InstanceKlass* ik = m->method_holder();
1946 BreakpointInfo* prev_bp = NULL;
1947 BreakpointInfo* next_bp;
1948 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1949 next_bp = bp->next();
1950 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1951 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1952 // do this first:
1953 bp->clear(m);
1954 // unhook it
1955 if (prev_bp != NULL)
1956 prev_bp->set_next(next_bp);
1957 else
1958 ik->set_breakpoints(next_bp);
1959 delete bp;
1960 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1961 // at same location. So we have multiple matching (method_index and bci)
1962 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1963 // breakpoint for clear_breakpoint request and keep all other method versions
1964 // BreakpointInfo for future clear_breakpoint request.
1965 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1966 // which is being called when class is unloaded. We delete all the Breakpoint
1967 // information for all versions of method. We may not correctly restore the original
1968 // bytecode in all method versions, but that is ok. Because the class is being unloaded
1969 // so these methods won't be used anymore.
1970 if (bci >= 0) {
1971 break;
1972 }
1973 } else {
1974 // This one is a keeper.
1975 prev_bp = bp;
1976 }
1977 }
1978 }
1979
1980 void Method::clear_breakpoint(int bci) {
1981 assert(bci >= 0, "");
1982 clear_matches(this, bci);
1983 }
1984
1985 void Method::clear_all_breakpoints() {
1986 clear_matches(this, -1);
1987 }
1988
1989 #endif // INCLUDE_JVMTI
1990
1991 int Method::invocation_count() const {
1992 MethodCounters* mcs = method_counters();
1993 MethodData* mdo = method_data();
1994 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1995 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1996 return InvocationCounter::count_limit;
1997 } else {
1998 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1999 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
2000 }
2001 }
2002
2003 int Method::backedge_count() const {
2004 MethodCounters* mcs = method_counters();
2005 MethodData* mdo = method_data();
2006 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
2007 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
2008 return InvocationCounter::count_limit;
2009 } else {
2010 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
2011 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
2012 }
2013 }
2014
2015 int Method::highest_comp_level() const {
2016 const MethodCounters* mcs = method_counters();
2017 if (mcs != NULL) {
2018 return mcs->highest_comp_level();
2019 } else {
2020 return CompLevel_none;
2021 }
2022 }
2023
2024 int Method::highest_osr_comp_level() const {
2025 const MethodCounters* mcs = method_counters();
2026 if (mcs != NULL) {
2027 return mcs->highest_osr_comp_level();
2028 } else {
2029 return CompLevel_none;
2030 }
2031 }
2032
2033 void Method::set_highest_comp_level(int level) {
2034 MethodCounters* mcs = method_counters();
2035 if (mcs != NULL) {
2036 mcs->set_highest_comp_level(level);
2037 }
2038 }
2039
2040 void Method::set_highest_osr_comp_level(int level) {
2041 MethodCounters* mcs = method_counters();
2042 if (mcs != NULL) {
2043 mcs->set_highest_osr_comp_level(level);
2044 }
2045 }
2046
2047 #if INCLUDE_JVMTI
2048
2049 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
2050 _bci = bci;
2051 _name_index = m->name_index();
2052 _signature_index = m->signature_index();
2053 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
2054 if (_orig_bytecode == Bytecodes::_breakpoint)
2055 _orig_bytecode = m->orig_bytecode_at(_bci);
2056 _next = NULL;
2057 }
2058
2059 void BreakpointInfo::set(Method* method) {
2060 #ifdef ASSERT
2061 {
2062 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
2063 if (code == Bytecodes::_breakpoint)
2064 code = method->orig_bytecode_at(_bci);
2065 assert(orig_bytecode() == code, "original bytecode must be the same");
2066 }
2067 #endif
2068 Thread *thread = Thread::current();
2069 *method->bcp_from(_bci) = Bytecodes::_breakpoint;
2070 method->incr_number_of_breakpoints(thread);
2071 {
2072 // Deoptimize all dependents on this method
2073 HandleMark hm(thread);
2074 methodHandle mh(thread, method);
2075 CodeCache::flush_dependents_on_method(mh);
2076 }
2077 }
2078
2079 void BreakpointInfo::clear(Method* method) {
2080 *method->bcp_from(_bci) = orig_bytecode();
2081 assert(method->number_of_breakpoints() > 0, "must not go negative");
2082 method->decr_number_of_breakpoints(Thread::current());
2083 }
2084
2085 #endif // INCLUDE_JVMTI
2086
2087 // jmethodID handling
2088
2089 // This is a block allocating object, sort of like JNIHandleBlock, only a
2090 // lot simpler.
2091 // It's allocated on the CHeap because once we allocate a jmethodID, we can
2092 // never get rid of it.
2093
2094 static const int min_block_size = 8;
2095
2096 class JNIMethodBlockNode : public CHeapObj<mtClass> {
2097 friend class JNIMethodBlock;
2098 Method** _methods;
2099 int _number_of_methods;
2100 int _top;
2101 JNIMethodBlockNode* _next;
2102
2103 public:
2104
2105 JNIMethodBlockNode(int num_methods = min_block_size);
2106
2107 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
2108
2109 void ensure_methods(int num_addl_methods) {
2110 if (_top < _number_of_methods) {
2111 num_addl_methods -= _number_of_methods - _top;
2112 if (num_addl_methods <= 0) {
2113 return;
2114 }
2115 }
2116 if (_next == NULL) {
2117 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
2118 } else {
2119 _next->ensure_methods(num_addl_methods);
2120 }
2121 }
2122 };
2123
2124 class JNIMethodBlock : public CHeapObj<mtClass> {
2125 JNIMethodBlockNode _head;
2126 JNIMethodBlockNode *_last_free;
2127 public:
2128 static Method* const _free_method;
2129
2130 JNIMethodBlock(int initial_capacity = min_block_size)
2131 : _head(initial_capacity), _last_free(&_head) {}
2132
2133 void ensure_methods(int num_addl_methods) {
2134 _last_free->ensure_methods(num_addl_methods);
2135 }
2136
2137 Method** add_method(Method* m) {
2138 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
2139 if (b->_top < b->_number_of_methods) {
2140 // top points to the next free entry.
2141 int i = b->_top;
2142 b->_methods[i] = m;
2143 b->_top++;
2144 _last_free = b;
2145 return &(b->_methods[i]);
2146 } else if (b->_top == b->_number_of_methods) {
2147 // if the next free entry ran off the block see if there's a free entry
2148 for (int i = 0; i < b->_number_of_methods; i++) {
2149 if (b->_methods[i] == _free_method) {
2150 b->_methods[i] = m;
2151 _last_free = b;
2152 return &(b->_methods[i]);
2153 }
2154 }
2155 // Only check each block once for frees. They're very unlikely.
2156 // Increment top past the end of the block.
2157 b->_top++;
2158 }
2159 // need to allocate a next block.
2160 if (b->_next == NULL) {
2161 b->_next = _last_free = new JNIMethodBlockNode();
2162 }
2163 }
2164 guarantee(false, "Should always allocate a free block");
2165 return NULL;
2166 }
2167
2168 bool contains(Method** m) {
2169 if (m == NULL) return false;
2170 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2171 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2172 // This is a bit of extra checking, for two reasons. One is
2173 // that contains() deals with pointers that are passed in by
2174 // JNI code, so making sure that the pointer is aligned
2175 // correctly is valuable. The other is that <= and > are
2176 // technically not defined on pointers, so the if guard can
2177 // pass spuriously; no modern compiler is likely to make that
2178 // a problem, though (and if one did, the guard could also
2179 // fail spuriously, which would be bad).
2180 ptrdiff_t idx = m - b->_methods;
2181 if (b->_methods + idx == m) {
2182 return true;
2183 }
2184 }
2185 }
2186 return false; // not found
2187 }
2188
2189 // Doesn't really destroy it, just marks it as free so it can be reused.
2190 void destroy_method(Method** m) {
2191 #ifdef ASSERT
2192 assert(contains(m), "should be a methodID");
2193 #endif // ASSERT
2194 *m = _free_method;
2195 }
2196
2197 // During class unloading the methods are cleared, which is different
2198 // than freed.
2199 void clear_all_methods() {
2200 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2201 for (int i = 0; i< b->_number_of_methods; i++) {
2202 b->_methods[i] = NULL;
2203 }
2204 }
2205 }
2206 #ifndef PRODUCT
2207 int count_methods() {
2208 // count all allocated methods
2209 int count = 0;
2210 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2211 for (int i = 0; i< b->_number_of_methods; i++) {
2212 if (b->_methods[i] != _free_method) count++;
2213 }
2214 }
2215 return count;
2216 }
2217 #endif // PRODUCT
2218 };
2219
2220 // Something that can't be mistaken for an address or a markWord
2221 Method* const JNIMethodBlock::_free_method = (Method*)55;
2222
2223 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) {
2224 _number_of_methods = MAX2(num_methods, min_block_size);
2225 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2226 for (int i = 0; i < _number_of_methods; i++) {
2227 _methods[i] = JNIMethodBlock::_free_method;
2228 }
2229 }
2230
2231 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) {
2232 // Have to add jmethod_ids() to class loader data thread-safely.
2233 // Also have to add the method to the list safely, which the lock
2234 // protects as well.
2235 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2236 if (cld->jmethod_ids() == NULL) {
2237 cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2238 } else {
2239 cld->jmethod_ids()->ensure_methods(capacity);
2240 }
2241 }
2242
2243 // Add a method id to the jmethod_ids
2244 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) {
2245 // Have to add jmethod_ids() to class loader data thread-safely.
2246 // Also have to add the method to the list safely, which the lock
2247 // protects as well.
2248 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check");
2249 if (cld->jmethod_ids() == NULL) {
2250 cld->set_jmethod_ids(new JNIMethodBlock());
2251 }
2252 // jmethodID is a pointer to Method*
2253 return (jmethodID)cld->jmethod_ids()->add_method(m);
2254 }
2255
2256 jmethodID Method::jmethod_id() {
2257 methodHandle mh(Thread::current(), this);
2258 return method_holder()->get_jmethod_id(mh);
2259 }
2260
2261 // Mark a jmethodID as free. This is called when there is a data race in
2262 // InstanceKlass while creating the jmethodID cache.
2263 void Method::destroy_jmethod_id(ClassLoaderData* cld, jmethodID m) {
2264 Method** ptr = (Method**)m;
2265 assert(cld->jmethod_ids() != NULL, "should have method handles");
2266 cld->jmethod_ids()->destroy_method(ptr);
2267 }
2268
2269 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2270 // Can't assert the method_holder is the same because the new method has the
2271 // scratch method holder.
2272 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2273 == new_method->method_holder()->class_loader() ||
2274 new_method->method_holder()->class_loader() == NULL, // allow Unsafe substitution
2275 "changing to a different class loader");
2276 // Just change the method in place, jmethodID pointer doesn't change.
2277 *((Method**)jmid) = new_method;
2278 }
2279
2280 bool Method::is_method_id(jmethodID mid) {
2281 Method* m = resolve_jmethod_id(mid);
2282 assert(m != NULL, "should be called with non-null method");
2283 InstanceKlass* ik = m->method_holder();
2284 ClassLoaderData* cld = ik->class_loader_data();
2285 if (cld->jmethod_ids() == NULL) return false;
2286 return (cld->jmethod_ids()->contains((Method**)mid));
2287 }
2288
2289 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2290 if (mid == NULL) return NULL;
2291 Method* o = resolve_jmethod_id(mid);
2292 if (o == NULL || o == JNIMethodBlock::_free_method) {
2293 return NULL;
2294 }
2295 // Method should otherwise be valid. Assert for testing.
2296 assert(is_valid_method(o), "should be valid jmethodid");
2297 // If the method's class holder object is unreferenced, but not yet marked as
2298 // unloaded, we need to return NULL here too because after a safepoint, its memory
2299 // will be reclaimed.
2300 return o->method_holder()->is_loader_alive() ? o : NULL;
2301 };
2302
2303 void Method::set_on_stack(const bool value) {
2304 // Set both the method itself and its constant pool. The constant pool
2305 // on stack means some method referring to it is also on the stack.
2306 constants()->set_on_stack(value);
2307
2308 bool already_set = on_stack();
2309 _access_flags.set_on_stack(value);
2310 if (value && !already_set) {
2311 MetadataOnStackMark::record(this);
2312 }
2313 }
2314
2315 void Method::record_gc_epoch() {
2316 // If any method is on the stack in continuations, none of them can be reclaimed,
2317 // so save the marking cycle to check for the whole class in the cpCache.
2318 // The cpCache is writeable.
2319 constants()->cache()->record_gc_epoch();
2320 }
2321
2322 // Called when the class loader is unloaded to make all methods weak.
2323 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2324 loader_data->jmethod_ids()->clear_all_methods();
2325 }
2326
2327 bool Method::has_method_vptr(const void* ptr) {
2328 Method m;
2329 // This assumes that the vtbl pointer is the first word of a C++ object.
2330 return dereference_vptr(&m) == dereference_vptr(ptr);
2331 }
2332
2333 // Check that this pointer is valid by checking that the vtbl pointer matches
2334 bool Method::is_valid_method(const Method* m) {
2335 if (m == NULL) {
2336 return false;
2337 } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2338 // Quick sanity check on pointer.
2339 return false;
2340 } else if (!os::is_readable_range(m, m + 1)) {
2341 return false;
2342 } else if (m->is_shared()) {
2343 return CppVtables::is_valid_shared_method(m);
2344 } else if (Metaspace::contains_non_shared(m)) {
2345 return has_method_vptr((const void*)m);
2346 } else {
2347 return false;
2348 }
2349 }
2350
2351 bool Method::is_scalarized_arg(int idx) const {
2352 if (!has_scalarized_args()) {
2353 return false;
2354 }
2355 // Search through signature and check if argument is wrapped in T_PRIMITIVE_OBJECT/T_VOID
2356 int depth = 0;
2357 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2358 for (int i = 0; i < sig->length(); i++) {
2359 BasicType bt = sig->at(i)._bt;
2360 if (bt == T_PRIMITIVE_OBJECT) {
2361 depth++;
2362 }
2363 if (idx == 0) {
2364 break; // Argument found
2365 }
2366 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2367 depth--;
2368 }
2369 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2370 idx--; // Advance to next argument
2371 }
2372 }
2373 return depth != 0;
2374 }
2375
2376 #ifndef PRODUCT
2377 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2378 out->print("%d", loader_data->jmethod_ids()->count_methods());
2379 }
2380 #endif // PRODUCT
2381
2382
2383 // Printing
2384
2385 #ifndef PRODUCT
2386
2387 void Method::print_on(outputStream* st) const {
2388 ResourceMark rm;
2389 assert(is_method(), "must be method");
2390 st->print_cr("%s", internal_name());
2391 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this));
2392 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr();
2393 st->print (" - constants: " PTR_FORMAT " ", p2i(constants()));
2394 constants()->print_value_on(st); st->cr();
2395 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2396 st->print (" - name: "); name()->print_value_on(st); st->cr();
2397 st->print (" - signature: "); signature()->print_value_on(st); st->cr();
2398 st->print_cr(" - max stack: %d", max_stack());
2399 st->print_cr(" - max locals: %d", max_locals());
2400 st->print_cr(" - size of params: %d", size_of_parameters());
2401 st->print_cr(" - method size: %d", method_size());
2402 if (intrinsic_id() != vmIntrinsics::_none)
2403 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2404 if (highest_comp_level() != CompLevel_none)
2405 st->print_cr(" - highest level: %d", highest_comp_level());
2406 st->print_cr(" - vtable index: %d", _vtable_index);
2407 #ifdef ASSERT
2408 if (valid_itable_index())
2409 st->print_cr(" - itable index: %d", itable_index());
2410 #endif
2411 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry()));
2412 st->print( " - adapters: ");
2413 AdapterHandlerEntry* a = ((Method*)this)->adapter();
2414 if (a == NULL)
2415 st->print_cr(PTR_FORMAT, p2i(a));
2416 else
2417 a->print_adapter_on(st);
2418 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry()));
2419 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2420 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry()));
2421 st->print_cr(" - code size: %d", code_size());
2422 if (code_size() != 0) {
2423 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base()));
2424 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size()));
2425 }
2426 if (method_data() != NULL) {
2427 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data()));
2428 }
2429 st->print_cr(" - checked ex length: %d", checked_exceptions_length());
2430 if (checked_exceptions_length() > 0) {
2431 CheckedExceptionElement* table = checked_exceptions_start();
2432 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table));
2433 if (Verbose) {
2434 for (int i = 0; i < checked_exceptions_length(); i++) {
2435 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2436 }
2437 }
2438 }
2439 if (has_linenumber_table()) {
2440 u_char* table = compressed_linenumber_table();
2441 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table));
2442 if (Verbose) {
2443 CompressedLineNumberReadStream stream(table);
2444 while (stream.read_pair()) {
2445 st->print_cr(" - line %d: %d", stream.line(), stream.bci());
2446 }
2447 }
2448 }
2449 st->print_cr(" - localvar length: %d", localvariable_table_length());
2450 if (localvariable_table_length() > 0) {
2451 LocalVariableTableElement* table = localvariable_table_start();
2452 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table));
2453 if (Verbose) {
2454 for (int i = 0; i < localvariable_table_length(); i++) {
2455 int bci = table[i].start_bci;
2456 int len = table[i].length;
2457 const char* name = constants()->printable_name_at(table[i].name_cp_index);
2458 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2459 int slot = table[i].slot;
2460 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2461 }
2462 }
2463 }
2464 if (code() != NULL) {
2465 st->print (" - compiled code: ");
2466 code()->print_value_on(st);
2467 }
2468 if (is_native()) {
2469 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function()));
2470 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2471 }
2472 }
2473
2474 void Method::print_linkage_flags(outputStream* st) {
2475 access_flags().print_on(st);
2476 if (is_default_method()) {
2477 st->print("default ");
2478 }
2479 if (is_overpass()) {
2480 st->print("overpass ");
2481 }
2482 }
2483 #endif //PRODUCT
2484
2485 void Method::print_value_on(outputStream* st) const {
2486 assert(is_method(), "must be method");
2487 st->print("%s", internal_name());
2488 print_address_on(st);
2489 st->print(" ");
2490 if (WizardMode) access_flags().print_on(st);
2491 name()->print_value_on(st);
2492 st->print(" ");
2493 signature()->print_value_on(st);
2494 st->print(" in ");
2495 method_holder()->print_value_on(st);
2496 if (WizardMode) st->print("#%d", _vtable_index);
2497 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2498 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2499 }
2500
2501 // Verification
2502
2503 void Method::verify_on(outputStream* st) {
2504 guarantee(is_method(), "object must be method");
2505 guarantee(constants()->is_constantPool(), "should be constant pool");
2506 MethodData* md = method_data();
2507 guarantee(md == NULL ||
2508 md->is_methodData(), "should be method data");
2509 }